CN102544604B - Battery system and method for equalizing electric quantity among battery modules - Google Patents
Battery system and method for equalizing electric quantity among battery modules Download PDFInfo
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Abstract
The invention provides a battery system and a method for equalizing electric quantity among battery modules. The battery system comprises more than two battery modules, a signal acquisition module, a residual electric quantity calculating module and a control module, wherein each battery module comprises a plurality of single batteries; a two-way isolation direct-current conversion circuit is arranged in each battery module; a sharing single battery is arranged between the two adjacent first battery modules and the two adjacent second battery modules in the battery system; a positive electrode and a negative electrode on one side of each of the two-way isolation direct-current conversion circuits in the first battery modules and the second battery modules are connected with positive electrodes and negative electrodes of the battery modules to which the two-way isolation direct-current conversion circuits belong; and a positive electrode and a negative electrode on the other side of each of the two-way isolation direct-current conversion circuits are connected with a positive electrode and a negative electrode of the sharing single battery of the first battery modules and the second battery modules. By the battery system and the method for equalizing the electric quantity among the battery modules, the electric quantity can be equalized among different battery modules.
Description
Technical field
The present invention relates to the administrative skill of battery, relate in particular to a kind of battery system and method for equalizing electric quantity among battery modules, belong to technical field of lithium batteries.
Background technology
Along with the development of power lithium battery pool technology and pure electric automobile technology, lithium battery has been substituted traditional lead-acid battery and Ni-MH battery becomes pure electric automobile the inside core energy storage device.Because lithium battery monomer voltage only has 3-4 volt, the electric power system of electric automobile a large amount of lithium battery of conventionally need to connecting, these lithium batteries are divided into a plurality of battery modules and connect respectively.For lithium battery, or the rechargeable battery of other kinds, monomer whose battery may the reason of the aspect such as technique cause cell capacity and internal resistance to occur inconsistency owing to dispatching from the factory, also may be inconsistent and cause battery capacity and internal resistance to occur inconsistency by aging speed after dispatching from the factory, also may cause battery dump energy value to occur inconsistency due to the difference of the factors such as ambient temperature of cell operation.No matter be the electric automobile electric power system that battery is directly in series, still first its battery strings is unified into battery module, further series connection obtains electric automobile electric power system again, and the inconsistency of above-mentioned battery performance has all proposed very high requirement to battery management system.
Due to the inconsistency of cell performance, the performance of whole battery module and battery system is subject to the restriction of the most weak cell.For example, when electric discharge, when a most weak joint cell reaches minimum voltage, battery system must stop electric discharge and protect this joint cell, but now, also has the capacity of other cells not exhaust in battery system; Equally, when charging, the cell that arrives at first ceiling voltage has hindered other cells and has continued charging, and whole battery system can not be charged cmpletely.And more crucial, so, after circulation repeatedly, the inconsistency between cell can be aggravated, and finally makes whole battery system available power reduce.The same with the battery system of electric automobile, all there is same problem in other any lithium battery systems.
At present, in prior art, cannot between the different battery modules of battery system, carry out electric quantity balancing.
Summary of the invention
The invention provides a kind of battery system and method for equalizing electric quantity among battery modules of electric automobile, for realizing, between the battery module of battery system, carry out electric quantity balancing.
First aspect of the present invention is to provide a kind of battery system, comprise plural battery module, each battery module includes a plurality of cells, also comprise signal acquisition module, dump energy computing module and control module, in each battery module, be provided with two-way isolated DC change-over circuit, and between any two the first adjacent battery modules and described the second battery module, be provided with shared cell in described battery system, described shared cell is in described the first battery module or described the second battery module, the positive pole of the battery module that the positive pole of one side of described the first battery module and two-way isolated DC change-over circuit in described the second battery module belongs to it respectively with negative pole is connected with negative pole, the positive pole of opposite side is connected with negative pole with the positive pole of described shared cell respectively by switching circuit with negative pole,
Described signal acquisition module is for gathering the performance parameter information of described the first adjacent battery module and all cells of described the second battery module;
Described dump energy computing module is used for obtaining according to the performance parameter information of all cells of the first battery module of signal acquisition module collection the residual electric quantity of all cells in described the first battery module, and for obtain the residual electric quantity of all cells in described the second battery module according to the performance parameter information of all cells of the second battery module of signal acquisition module collection;
Described control module is for obtaining the residual electric quantity of described the first battery module according to the residual electric quantity of all cells of described the first battery module, and the residual electric quantity of obtaining described the second battery module according to the residual electric quantity of all cells in described the second battery module, two-way isolated DC change-over circuit to the larger battery module of residual electric quantity sends by battery module to the first indication of sharing cell charging, and send by sharing second indication of cell to charging battery module to the two-way isolated DC change-over circuit of the less battery module of residual electric quantity,
Described two-way isolated DC change-over circuit is charged to shared cell by the larger battery module of described residual electric quantity for the first indication control according to control module, and controls by shared cell to the less charging battery module of described residual electric quantity according to the second indication of described control module.
Another aspect of the present invention is to provide a kind of method for equalizing electric quantity among battery modules, for carrying out electric quantity among battery equilibrium at the battery system that comprises plural battery module, each battery module includes a plurality of cells, this battery system also comprises signal acquisition module, dump energy computing module and control module, in each battery module, be provided with two-way isolated DC change-over circuit, in described battery system, between any two the first adjacent battery modules and described the second battery module, be provided with shared cell, described shared cell is in described the first battery module or described the second battery module, the positive pole of the battery module that the positive pole of one side of described the first battery module and two-way isolated DC change-over circuit in described the second battery module belongs to it respectively with negative pole is connected with negative pole, the positive pole of opposite side is connected with negative pole with the positive pole of described shared cell respectively by switching circuit with negative pole, it is characterized in that, described method comprises:
Signal acquisition module gathers the performance parameter information of all cells in described the first adjacent battery module and described the second battery module;
Dump energy computing module obtains the residual electric quantity of all cells in described the first battery module according to the performance parameter information of all cells in the first battery module of signal acquisition module collection, and the residual electric quantity of obtaining all cells in described the second battery module according to the performance parameter information of all cells in the second battery module of signal acquisition module collection;
Control module is obtained the residual electric quantity of described the first battery module according to the residual electric quantity of all cells in described the first battery module, and the residual electric quantity of obtaining described the second battery module according to the residual electric quantity of all cells in described the second battery module, two-way isolated DC change-over circuit to the larger battery module of residual electric quantity sends by battery module to the first indication of sharing cell charging, and send by sharing second indication of cell to charging battery module to the two-way isolated DC change-over circuit of the less battery module of residual electric quantity,
The two-way isolated DC change-over circuit of the battery module that residual electric quantity is larger is controlled battery module according to described the first indication and charge to shared cell, and the two-way isolated DC change-over circuit of the less battery module of residual electric quantity according to the shared cell of described the second indication control to charging battery module.
In the technical scheme of the above embodiment of the present invention, between two of battery system adjacent battery modules, be provided with shared cell, and be provided with two-way isolated DC change-over circuit for each battery module, the performance parameter information of the cell gathering by signal acquisition module, and the calculating of dump energy computing module can be obtained the residual electric quantity of these two adjacent battery modules, then according to the residual electric quantity of above-mentioned two battery modules, determine that the battery module that residual electric quantity is less needs charging, the battery module that residual electric quantity is larger needs electric discharge, by two-way isolated DC change-over circuit, control and need the battery module of electric discharge to discharge to the shared cell of the two, and control this shared cell to the charging battery module of needs charging by two-way isolated DC change-over circuit, by above-mentioned technical scheme, can realize and between different battery modules, carry out electric quantity balancing.
Accompanying drawing explanation
Fig. 1 is the structural representation of battery system in the embodiment of the present invention;
Fig. 2 is the flow chart of steps of method for equalizing electric quantity among battery modules in the embodiment of the present invention.
Embodiment
For carrying out the problem of electric quantity balancing in prior art between the different battery modules of battery system, the embodiment of the present invention provides a kind of technical scheme, Fig. 1 is the structural representation of battery system in the embodiment of the present invention, as shown in Figure 1, the plural battery module of this battery system, each battery module includes a plurality of cells, in addition, this battery system also comprises signal acquisition module 13, dump energy computing module 14 and control module 15, and in described battery system, two the first adjacent battery modules 11 and the second battery module 12 include two-way isolated DC change-over circuit 16, the positive pole of one side of described two-way isolated DC change-over circuit 16 and negative pole respectively with its under the positive pole of battery module be connected with negative pole, the positive pole of the opposite side of described two-way isolated DC change-over circuit 16 is connected with negative pole with the positive pole of the shared cell 17 of described the second battery module 12 with described the first battery module 11 respectively by switching circuit with negative pole, above-mentioned signal acquisition module 13 is for gathering the performance parameter information of described the first adjacent battery module and all cells of described the second battery module, dump energy computing module 14 obtains the residual electric quantity of all cells in described the first battery module for the performance parameter information of all cells of the first battery module that gather according to signal acquisition module 13, and for obtain the residual electric quantity of all cells in described the second battery module according to the performance parameter information of all cells of the second battery module of signal acquisition module collection, control module 15 is for obtaining the residual electric quantity of described the first battery module according to the residual electric quantity of all cells of described the first battery module, and the residual electric quantity of obtaining described the second battery module according to the residual electric quantity of all cells in described the second battery module, two-way isolated DC change-over circuit 16 to the larger battery module of residual electric quantity sends by battery module to the first indication of sharing cell 17 chargings, and send by sharing second indication of cell 17 to charging battery module to the two-way isolated DC change-over circuit 16 of the less battery module of residual electric quantity, two-way isolated DC change-over circuit 16 charges to shared cell 17 for controlling according to the first indication of control module 15 by the larger battery module of described residual electric quantity, and controls by shared cell 17 to the less charging battery module of described residual electric quantity according to the second indication of described control module 15.
In the technical scheme of the above embodiment of the present invention, between two of battery system adjacent battery modules, be provided with shared cell, and be provided with two-way isolated DC change-over circuit for each battery module, the performance parameter information of the cell gathering by signal acquisition module, and the calculating of dump energy computing module can be obtained the residual electric quantity of these two adjacent battery modules, then according to the residual electric quantity of above-mentioned two battery modules, determine that the battery module that residual electric quantity is less needs charging, the battery module that residual electric quantity is larger needs electric discharge, by two-way isolated DC change-over circuit, control and need the battery module of electric discharge to discharge to the shared cell of the two, and control this shared cell to the charging battery module of needs charging by two-way isolated DC change-over circuit, by above-mentioned technical scheme, can realize and between different battery modules, carry out electric quantity balancing.
Signal acquisition module in the above-mentioned enforcement of the present invention and the set-up mode of dump energy computing module are various, signal acquisition module wherein can consist of a plurality of signal gathering unit, the corresponding battery module of each signal gathering unit, in each battery module, the performance parameter information of cell is gathered by signal gathering unit, and corresponding, also for each battery module arranges a dump energy computing unit, to calculate the residual electric quantity of all cells in corresponding battery module, concrete setting position for above-mentioned signal gathering unit and dump energy computing unit, both can be in each battery module, also can be in the management equipment of whole battery system, and, also can be signal gathering unit dispersed placement, and one of dump energy computing module concentrated setting, and dump energy computing module can synthesize an over all Integration setting with control module.
In the above embodiment of the present invention, to be illustrated for the electric quantity balancing between two battery modules in battery system, for the situation that has more battery modules, technical scheme of the present invention also can be suitable for, can be by shared cell being set between any two adjacent battery modules, simultaneously for each battery module arranges two-way isolated DC change-over circuit, the positive pole of one side of this two-way isolated DC change-over circuit and negative pole respectively with its under the positive pole of battery module be connected with negative pole, the positive pole of the opposite side of this two-way isolated DC change-over circuit is connected with negative pole with the positive pole of shared cell respectively with negative pole, in addition, for one of them battery module, if be all provided with shared cell between itself and adjacent two battery modules, the opposite side of its two-way isolated DC change-over circuit can selectivity be connected with negative pole with arbitrary positive pole that need to carry out the shared cell of intermodule electric quantity balancing, concrete can realize above-mentioned connection by control module gating matrix switch.For example, in Fig. 1, the first battery module wherein can also comprise a shared cell 18, this shared cell 18 can be used for carrying out electric quantity balancing with another adjacent the second battery module (not shown) of the first battery module, and simultaneously control module can also be for selecting the positive pole of opposite side of two-way isolated DC change-over circuit of the first battery module and the both positive and negative polarity that negative pole is connected respectively to the shared cell of the first battery module and arbitrary the second battery module by matrix switch.
In the above embodiment of the present invention, the performance parameter information that signal acquisition module 11 wherein gathers can comprise voltage parameter, temperature parameter, and charge parameter and/or discharge parameter, described charge parameter comprises charging current parameter and charging interval parameter, described discharge parameter comprise discharging current parameter and discharge time parameter;
And in concrete implementation process, can a signal acquisition module be set for a battery system unification, or also can a signal gathering unit be set for each battery module, for example, for two the first adjacent battery modules and the second battery module, above-mentioned signal acquisition module comprises first signal collecting unit and secondary signal collecting unit, first signal collecting unit is for gathering the voltage parameter of all cells of described the first battery module, temperature parameter, and charge parameter and/or discharge parameter, secondary signal collecting unit is for gathering the voltage parameter of all cells of described the second battery module, temperature parameter, and charge parameter and/or discharge parameter.
For dump energy computing module, also can a dump energy computing module be set or also can a dump energy computing unit be set for each battery module for a battery system unification, for example, for the first adjacent battery module and the second battery module, dump energy computing module comprises the first dump energy computing unit and the second dump energy computing unit, the first dump energy computing unit is for obtaining the capacity of all cells of the first battery module according to the described voltage parameter of first signal collecting unit collection and temperature parameter, and the available power of further obtaining all cells in the first battery module according to charge parameter and/or discharge parameter, obtain the residual electric quantity of all cells, the second dump energy computing unit is for obtaining the capacity of all cells of the second battery module according to the described voltage parameter of secondary signal collecting unit collection and temperature parameter, and the available power of further obtaining each cell in the second battery module according to charge parameter and/or discharge parameter, obtain the residual electric quantity of all cells, concrete, for each cell, the ratio of the available power that its residual electric quantity is each cell and the capacity of cell.
For the signal acquisition module in above-described embodiment, its signal getting at first may be analog signal, also need to carry out analog-to-digital conversion, after being converted to digital quantity, the analog signal collecting sends to dump energy computing module, in addition, for dump energy computing module, it can be the module arranging separately, can be to be also integrated into a physical entity with control module.
In the above embodiment of the present invention, finally obtain the residual electric quantity of the first battery module, in technical scheme of the present invention, can think that the residual electric quantity of interior each cell of battery module is identical, or electric quantity balancing has been carried out in battery module inside, the residual electric quantity of wherein each cell is basic identical, can adopt the residual electric quantity of the dump energy value representation battery module of any cell.In addition, when in a battery module, the residual electric quantity of different monomers battery has difference, can select the mean value of residual electric quantity of all cells as the residual electric quantity of this battery module, the residual electric quantity that is above-mentioned the first battery module is the mean value of the residual electric quantity of all cells in the first battery module, and the residual electric quantity of the second battery module is the mean value of the residual electric quantity of all cells in the second battery module.
Concrete, electric quantity balancing for battery module inside, in the above-described embodiments, by the agency of signal gathering unit and dump energy computing unit can obtain the residual electric quantity of all cells in battery module, the positive pole of one side of two-way isolated DC change-over circuit of while and positive pole and the negative pole that negative pole is connected to battery module, the positive pole of the opposite side of two-way isolated DC change-over circuit and negative pole can be connected to by switch matrix positive pole and the negative pole of any cell, very little or when very large in the residual electric quantity that gets the inner a certain cell of battery module, easily by controlling two-way isolated DC change-over circuit, realize battery module and charge to cell, or cell discharges to battery module, to realize the electric quantity balancing of battery module inside.This two-way isolated DC change-over circuit is equivalent to an energy conversion device, when to shared cell charging, by controlling sense of current in the circuit that itself and shared cell form, can realize battery module and charge to shared cell by two-way isolated DC change-over circuit; By controlling sense of current in the circuit that itself and cell form, can also realize battery module and discharge to sharing cell by two-way isolated DC change-over circuit, share cell to charging battery module.
Control module in the above embodiment of the present invention is also for according to the residual electric quantity of the first battery module, and the residual electric quantity of described the second battery module is obtained battery module that residual electric quantity is larger to size of current and the charging interval of sharing cell charging, control module is carried described size of current and the charging interval to sharing cell charging in the first indication of the two-way isolated DC change-over circuit transmission of the larger battery module of residual electric quantity, specifically to be controlled discharging and recharging according to indication by two-way isolated DC change-over circuit; And also for obtaining, share cell to size of current and the charging interval of the less charging battery module of described residual electric quantity, described control module is carried described size of current and the charging interval to the less charging battery module of described residual electric quantity in the second indication of the two-way isolated DC change-over circuit transmission of the less battery module of residual electric quantity, to be controlled discharging and recharging according to indication by two-way isolated DC change-over circuit.
For example, for two battery module A in a battery system and battery module B, wherein according to the performance parameter information of all cells in each battery module, obtain the capacity of each cell, for the first battery module A, its total capacity is 1000Ah, and its residual electric quantity is 80%, in addition for battery module B, its total capacity is also 1000Ah, and its residual electric quantity is 90%, now can determine that battery module B is to shared cell charging 50Ah, also will be to battery module A charging 50Ah and share cell, if the electric current of above-mentioned charging is all made as 10A, the charging interval is 5 hours.Above-mentioned battery module A is to sharing cell charging, and shared cell charges and can carry out simultaneously battery module B, also can be after battery module A have charged to shared cell, by shared cell, battery module B is charged again, as long as the electric weight that can keep sharing in cell is greater than zero.
The present invention also provides a kind of method for equalizing electric quantity among battery modules, the method is carried out electric quantity among battery equilibrium in comprising the battery system of plural battery module, each battery module includes a plurality of cells, this battery system also comprises signal acquisition module, dump energy computing module and control module, in each battery module, be provided with two-way isolated DC change-over circuit, in described battery system, between any two the first adjacent battery modules and described the second battery module, be provided with shared cell, described shared cell is in described the first battery module or described the second battery module, the positive pole of the battery module that the positive pole of one side of described the first battery module and two-way isolated DC change-over circuit in described the second battery module belongs to it respectively with negative pole is connected with negative pole, the positive pole of opposite side is connected with negative pole with the positive pole of described shared cell respectively by switching circuit with negative pole.Fig. 2 is the flow chart of steps of method for equalizing electric quantity among battery modules in the embodiment of the present invention, as shown in Figure 2, comprises following step:
The two-way isolated DC change-over circuit of step 104, battery module that residual electric quantity is larger is controlled battery module according to described the first indication and charge to shared cell, and the two-way isolated DC change-over circuit of the less battery module of residual electric quantity according to the shared cell of described the second indication control to charging battery module.
In the technical scheme of the above embodiment of the present invention, between two of battery system adjacent battery modules, be provided with shared cell, and be provided with two-way isolated DC change-over circuit for each battery module, the performance parameter information of the cell gathering by signal acquisition module, dump energy computing module calculates and obtains the residual electric quantity of all cells in two battery modules, control module is further confirmed the residual electric quantity of two battery modules, then according to the residual electric quantity of above-mentioned two battery modules, determine that the battery module that residual electric quantity is less needs charging, the battery module that residual electric quantity is larger needs electric discharge, by the two-way isolated DC change-over circuit control being arranged in battery module, need the battery module of electric discharge to discharge to the shared cell of the two, and the two-way isolated DC change-over circuit being arranged in battery module is controlled this shared cell to the charging battery module of needs charging, by above-mentioned technical scheme, can realize and between different battery modules, carry out electric quantity balancing.
In the above embodiment of the present invention, wherein the residual electric quantity of above-mentioned the first battery module is the mean value in the residual electric quantity of all cells in the first battery module, and the residual electric quantity of the second battery module is the mean value in the residual electric quantity of all cells in the second battery module.
In addition, performance parameter information in above-described embodiment can comprise voltage parameter, temperature parameter, and charge parameter and/or discharge parameter, described charge parameter comprises charging current parameter and charging interval parameter, described discharge parameter comprise discharging current parameter and discharge time parameter.
The residual electric quantity that dump energy computing module in above-mentioned steps 102 obtains all cells in described the first battery module according to the performance parameter information of all cells in the first battery module of signal acquisition module collection comprises:
Dump energy computing module obtains the capacity of all cells in the first battery module according to the voltage parameter of all cells in the first battery module and temperature parameter, and the residual electric quantity of further obtaining all cells in the first battery module according to charge parameter and/or discharge parameter;
The residual electric quantity that dump energy computing module in above-mentioned steps 102 obtains all cells in described the second battery module according to the performance parameter information of all cells in the second battery module of signal acquisition module collection comprises:
Dump energy computing module obtains the capacity of all cells in the second battery module according to the voltage parameter of all cells in the second battery module and temperature parameter, and the residual electric quantity of further obtaining all cells in the second battery module according to charge parameter and/or discharge parameter.
In addition, above-mentioned control module can also be according to the residual electric quantity of described the first battery module, and the residual electric quantity of described the second battery module obtains battery module that residual electric quantity is larger to size of current and the charging interval of sharing cell charging, described control module is carried at by described size of current and the charging interval to sharing cell charging the two-way isolated DC change-over circuit that sends to the battery module that described residual electric quantity is larger in described the first indication;
Above-mentioned control module can also be according to the residual electric quantity of described the first battery module, and the residual electric quantity of described the second battery module obtains and share cell to size of current and the charging interval of the less charging battery module of described residual electric quantity, described control module is carried at the two-way isolated DC change-over circuit that sends to the battery module that described residual electric quantity is less in described the second indication by described shared cell to size of current and charging interval of the less charging battery module of described residual electric quantity.
The method for equalizing electric quantity among battery modules that each embodiment of the present invention provides can, in to the process of described battery system charging, in described battery system discharge process, or carry out equilibrium to the electric weight between described battery module under static situation.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of program command.Aforesaid program can be stored in a computer read/write memory medium.This program, when carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a battery system, comprise plural battery module, each battery module includes a plurality of cells, it is characterized in that, also comprise signal acquisition module, dump energy computing module and control module, in each battery module, be provided with two-way isolated DC change-over circuit, and between any two the first adjacent battery modules and the second battery module, be provided with shared cell in described battery system, described shared cell is in described the first battery module or described the second battery module, the positive pole of the battery module that the positive pole of one side of described the first battery module and two-way isolated DC change-over circuit in described the second battery module belongs to it respectively with negative pole is connected with negative pole, the positive pole of opposite side is connected with negative pole with the positive pole of described shared cell respectively by switching circuit with negative pole,
Described signal acquisition module is for gathering the performance parameter information of described the first adjacent battery module and all cells of described the second battery module;
Described dump energy computing module is used for obtaining according to the performance parameter information of all cells of the first battery module of signal acquisition module collection the residual electric quantity of all cells in described the first battery module, and for obtain the residual electric quantity of all cells in described the second battery module according to the performance parameter information of all cells of the second battery module of signal acquisition module collection;
Described control module is for obtaining the residual electric quantity of described the first battery module according to the residual electric quantity of all cells of described the first battery module, and the residual electric quantity of obtaining described the second battery module according to the residual electric quantity of all cells in described the second battery module, two-way isolated DC change-over circuit to the larger battery module of residual electric quantity sends first indication of being charged to shared cell by the larger battery module of described residual electric quantity, and send by sharing second indication of cell to the less charging battery module of described residual electric quantity to the two-way isolated DC change-over circuit of the less battery module of residual electric quantity,
The two-way isolated DC change-over circuit of the battery module that described residual electric quantity is larger is for controlling and charged to shared cell by the larger battery module of described residual electric quantity according to the first indication of control module, and the two-way isolated DC turn of tidal stream circuit of the battery module that described residual electric quantity is less is controlled by shared cell to the less charging battery module of described residual electric quantity for the second indication according to described control module.
2. battery system according to claim 1, it is characterized in that, the residual electric quantity of described the first battery module is the mean value of the residual electric quantity of all cells in described the first battery module, and the residual electric quantity of described the second battery module is the mean value of the residual electric quantity of all cells in described the second battery module.
3. battery system according to claim 1, it is characterized in that, described performance parameter information comprises voltage parameter, temperature parameter, and charge parameter and/or discharge parameter, described charge parameter comprises charging current parameter and charging interval parameter, described discharge parameter comprise discharging current parameter and discharge time parameter;
Described signal acquisition module comprises first signal collecting unit and secondary signal collecting unit, described first signal collecting unit is for gathering voltage parameter, the temperature parameter of all cells of described the first battery module, and charge parameter and/or discharge parameter, described secondary signal collecting unit is for gathering voltage parameter, the temperature parameter of all cells of described the second battery module, and charge parameter and/or discharge parameter;
Described dump energy computing module comprises the first dump energy computing unit and the second dump energy computing unit, described the first dump energy computing unit is for obtaining the capacity of all cells of first battery module according to the described voltage parameter of first signal collecting unit collection and temperature parameter, and the residual electric quantity of further obtaining all cells in first battery module according to charge parameter and/or discharge parameter, described the second dump energy computing unit is for obtaining the capacity of second all cell of battery module according to the described voltage parameter of secondary signal collecting unit collection and temperature parameter, and the residual electric quantity of further obtaining all cells in second battery module according to charge parameter and/or discharge parameter.
4. according to the battery system described in claim 1,2 or 3, it is characterized in that, described control module is also for according to the residual electric quantity of described the first battery module, and the residual electric quantity of described the second battery module obtains battery module that residual electric quantity is larger to size of current and the charging interval of sharing cell charging, in the first indication that control module sends to the two-way isolated DC change-over circuit of the larger battery module of residual electric quantity, carry described size of current and the charging interval to sharing cell charging; And,
Also for obtaining, share cell to size of current and the charging interval of the less charging battery module of described residual electric quantity, described control module is carried described size of current and the charging interval to the less charging battery module of described residual electric quantity in the second indication of the two-way isolated DC change-over circuit transmission of the less battery module of residual electric quantity.
5. battery system according to claim 1, it is characterized in that, also comprise matrix switch, and the number of second battery module adjacent with described the first battery module is two, described control module is also for selecting the positive pole of opposite side of two-way isolated DC change-over circuit of described the first battery module and the both positive and negative polarity that negative pole is connected respectively to the shared cell of described the first battery module and arbitrary the second battery module by matrix switch.
6. a method for equalizing electric quantity among battery modules, for carrying out electric quantity among battery equilibrium at the battery system that comprises plural battery module, each battery module includes a plurality of cells, this battery system also comprises signal acquisition module, dump energy computing module and control module, in each battery module, be provided with two-way isolated DC change-over circuit, in described battery system, between any two the first adjacent battery modules and the second battery module, be provided with shared cell, described shared cell is in described the first battery module or described the second battery module, the positive pole of the battery module that the positive pole of one side of described the first battery module and two-way isolated DC change-over circuit in described the second battery module belongs to it respectively with negative pole is connected with negative pole, the positive pole of opposite side is connected with negative pole with the positive pole of described shared cell respectively by switching circuit with negative pole, it is characterized in that, described method comprises:
Signal acquisition module gathers the performance parameter information of all cells in described the first adjacent battery module and described the second battery module;
Dump energy computing module obtains the residual electric quantity of all cells in described the first battery module according to the performance parameter information of all cells in the first battery module of signal acquisition module collection, and the residual electric quantity of obtaining all cells in described the second battery module according to the performance parameter information of all cells in the second battery module of signal acquisition module collection;
Control module is obtained the residual electric quantity of described the first battery module according to the residual electric quantity of all cells in described the first battery module, and the residual electric quantity of obtaining described the second battery module according to the residual electric quantity of all cells in described the second battery module, two-way isolated DC change-over circuit to the larger battery module of residual electric quantity sends first indication of being charged to shared cell by the larger battery module of described residual electric quantity, and send by sharing second indication of cell to the less charging battery module of described residual electric quantity to the two-way isolated DC change-over circuit of the less battery module of residual electric quantity,
The two-way isolated DC change-over circuit of the battery module that residual electric quantity is larger is controlled battery module according to described the first indication and charge to shared cell, and the two-way isolated DC change-over circuit of the less battery module of residual electric quantity according to the shared cell of described the second indication control to charging battery module.
7. method for equalizing electric quantity among battery modules according to claim 6, it is characterized in that, the residual electric quantity of described the first battery module is the mean value of the residual electric quantity of all cells in described the first battery module, and the residual electric quantity of described the second battery module is the mean value of the residual electric quantity of all cells in described the second battery module.
8. method for equalizing electric quantity among battery modules according to claim 6, it is characterized in that, described performance parameter information comprises voltage parameter, temperature parameter, and charge parameter and/or discharge parameter, described charge parameter comprises charging current parameter and charging interval parameter, described discharge parameter comprise discharging current parameter and discharge time parameter; And
The residual electric quantity that described dump energy computing module obtains all cells in described the first battery module according to the performance parameter information of all cells in the first battery module of signal acquisition module collection comprises:
Dump energy computing module obtains the capacity of all cells in all first battery modules according to the voltage parameter of all cells in the first battery module and temperature parameter, and the residual electric quantity of further obtaining all cells in first battery module according to charge parameter and/or discharge parameter; And
The residual electric quantity that described dump energy computing module obtains all cells in described the second battery module according to the performance parameter information of all cells in the second battery module of signal acquisition module collection comprises:
Dump energy computing module obtains the capacity of all cells in the second battery module according to the voltage parameter of all cells in the second battery module and temperature parameter, and the residual electric quantity of further obtaining all cells in the second battery module according to charge parameter and/or discharge parameter.
9. method for equalizing electric quantity among battery modules according to claim 6, is characterized in that, also comprises:
Described control module is according to the residual electric quantity of described the first battery module, and the residual electric quantity of described the second battery module obtains battery module that residual electric quantity is larger to size of current and the charging interval of sharing cell charging, described control module is carried at by described size of current and the charging interval to sharing cell charging the two-way isolated DC change-over circuit that sends to the battery module that described residual electric quantity is larger in described the first indication; And
Described control module is according to the residual electric quantity of described the first battery module, and the residual electric quantity of described the second battery module obtains and share cell to size of current and the charging interval of the less charging battery module of described residual electric quantity, described control module is carried at the two-way isolated DC change-over circuit that sends to the battery module that described residual electric quantity is less in described the second indication by described shared cell to size of current and charging interval of the less charging battery module of described residual electric quantity.
10. according to the arbitrary described method for equalizing electric quantity among battery modules of claim 6～9, it is characterized in that, in to the process of described battery system charging, in described battery system discharge process, or under static situation, the electric weight between described battery module is carried out to equilibrium.
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| CN109088112A (en) * | 2018-02-07 | 2018-12-25 | 无锡瓴芯电子科技有限公司 | A kind of series-connected cell group modularization management system |
| CN110323793B (en) * | 2018-03-30 | 2021-04-20 | 比亚迪股份有限公司 | Method and device for balancing automobile and power battery pack |
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| CN101917047A (en) * | 2010-08-20 | 2010-12-15 | 深圳市科列技术有限公司 | Method and circuit for dynamically equalizing battery management system |
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