CN104391251B - Data acquisition method of electric vehicle battery management system - Google Patents
Data acquisition method of electric vehicle battery management system Download PDFInfo
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- CN104391251B CN104391251B CN201410657150.XA CN201410657150A CN104391251B CN 104391251 B CN104391251 B CN 104391251B CN 201410657150 A CN201410657150 A CN 201410657150A CN 104391251 B CN104391251 B CN 104391251B
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Abstract
The invention discloses a data acquisition method of an electric vehicle battery management system. The data acquisition method comprises the following steps: acquiring maximum discharge current of a power battery at different temperatures and in different charge state; determining discharge capacity of the power battery at different temperatures when the power battery is in a fully charged state; discharging the power battery for 15s at limited 3C current, discharging from 1/3C to a charge state of 70%; acquiring maximum charge current of the power battery at different temperatures and in different charge state; performing 1/3C constant-current discharging until the voltage is equal to a specified cut-off voltage of a battery manufacturer when the power battery is in a lowest charge state, and determining the charge capacity of the power battery at different temperatures; under a certain set temperature condition, charging the power battery for 10s at limited 1.5C current, and charging the power battery to a charge state of 20% according to standards. The data acquisition method disclosed by the invention has the advantages of preventing overcharge and over-discharge and improving the consistency of an overall battery pack so that the service lives of the power battery and an overall vehicle are prolonged.
Description
Technical field
The present invention relates to Prospect of EVS Powered with Batteries, more particularly, to cell management system of electric automobile data acquisition side
Method.
Background technology
With increasingly increasing for global energy crisis and environmental pollution, the development of pure electric automobile has become future automobile work
One of industry developing direction.Power battery pack is the important component part of electric automobile, directly affects the starting of electric automobile, adds
The multinomial performances such as speed, climbing and distance travelled.Therefore, to different temperatures and different state-of-charges（SOC）Lower electrokinetic cell is most
The test of big charging current and discharge current, and by test result and battery management system（BMS）Associate so that cell tube
Reason system preferably manages and monitors battery performance, prevents electrokinetic cell super-charge super-discharge electricity, improves battery bag global consistency, enter
And the life-span of raising electrokinetic cell and car load, comprehensively assurance electric automobile whole performance become particularly important.
The content of the invention
Present invention aim at providing a kind of cell management system of electric automobile collecting method.
For achieving the above object, the present invention takes following technical proposals：
Cell management system of electric automobile collecting method of the present invention, comprises the steps：
The maximum discharge current collection of electrokinetic cell under A, different temperatures and different state-of-charges：
The first step, electrokinetic cell determine electrokinetic cell discharge capacity at different temperatures under fullcharging electricity condition；
Second step, setting certain temperature conditions under, electric discharge 15s is carried out with current limliting 3C electric current to electrokinetic cell, stand
10min, is discharged under 70% state-of-charge with 1/3C, stands 10min；
If in the 3rd step, above-mentioned second step process of the test during constant-current discharge deficiency of time 15s, recovering shape charged to second step
State, discharge current are decreased to 2.75C and proceed, by that analogy to constant-current discharge time >=15s；
If the 4th step, above-mentioned second step process of the test constant-current discharge time >=15s, 70% state-of-charge at a set temperature
Capacity carries out electric discharge 15s with 3C electric currents to electrokinetic cell, stands 10min, is discharged to 50% state-of-charge with 1/3C, stands
10min；
If the 5th step, above-mentioned 4th step can not normal 3C current discharges, after standard charging, go to 80% lotus under design temperature
Electricity condition repeats second step～the 4th step with 3C current discharges, by that analogy to constant-current discharge time >=15s；
6th step, the maximum discharge current value for repeating second step～the 5th step to 10% state-of-charge under design temperature are simultaneously remembered
Record test data；
The maximum charging current collection of electrokinetic cell under B, different temperatures and different state-of-charges：
The first step, electrokinetic cell are under minimum state-of-charge, with the cut-off of 1/3C constant-current discharges to battery vendors dictate
Voltage, determines electrokinetic cell charging capacity at different temperatures；
Second step, setting certain temperature conditions under, 10s is charged with current limliting 1.5C electric current to electrokinetic cell, stand
10min, with standard charging to 20% state-of-charge, stands 10min；
If in the 3rd step, second step process of the test during constant-current charge deficiency of time 10s, recovering to second step state-of-charge,
Charging current is decreased to 1.25C and proceeds, by that analogy to constant-current charge time >=10s；
If the 4th step, second step process of the test constant-current charge time >=10s, at a set temperature 20% state-of-charge with
1.5C electric currents are charged 10s to electrokinetic cell, stand 10min, charge to 40% state-of-charge with 1/3C, stand 10min；
If the 5th step, above-mentioned 4th step normally 1.5C electric currents can not charge, after standard electric discharge, go at a set temperature
10% state-of-charge is charged with 1.25C electric currents and repeats second step～the 4th step, by that analogy to constant-current charge time >=10s；
6th step, the pairs of maximum charging current values for repeating second step～the 5th step to 90% state-of-charge of design temperature are simultaneously recorded
Test data.
The invention has the advantages that short to electrokinetic cell parameter testing collection simple and fast, testing time.By collection
In data inputting cell management system of electric automobile, cell management system of electric automobile can by search obtain different temperatures,
The maximum charging current and discharge current of electrokinetic cell under different state-of-charges, for needed for car load is in different road condition downward drivings
Maximum output and regenerative braking feedback power foundation is provided, also allow for cell management system of electric automobile and preferably management and supervise
The performance of control electrokinetic cell, especially can protect electrokinetic cell under high temperature and low temperature environment to a greater extent, prevent from overcharging,
Overdischarge, improves the overall concordance of battery bag, and then improves the life-span of electrokinetic cell and car load.
Specific embodiment
Cell management system of electric automobile collecting method of the present invention, comprises the steps：
The maximum discharge current collection of electrokinetic cell under A, different temperatures and different state-of-charges：
The first step, electrokinetic cell determine electrokinetic cell discharge capacity at different temperatures under fullcharging electricity condition；
Second step, setting certain temperature conditions under, electric discharge 15s is carried out with current limliting 3C electric current to electrokinetic cell, stand
10min, is discharged under 70% state-of-charge with 1/3C, stands 10min；
If in the 3rd step, above-mentioned second step process of the test during constant-current discharge deficiency of time 15s, recovering shape charged to second step
State, discharge current are decreased to 2.75C and proceed, by that analogy to constant-current discharge time >=15s；
If the 4th step, above-mentioned second step process of the test constant-current discharge time >=15s, 70% state-of-charge at a set temperature
Capacity carries out electric discharge 15s with 3C electric currents to electrokinetic cell, stands 10min, is discharged to 50% state-of-charge with 1/3C, stands
10min；
If the 5th step, above-mentioned 4th step can not normal 3C current discharges, after standard charging, go to 80% lotus under design temperature
Electricity condition repeats second step～the 4th step with 3C current discharges, by that analogy to constant-current discharge time >=15s；
6th step, the maximum discharge current value for repeating second step～the 5th step to 10% state-of-charge under design temperature are simultaneously remembered
Record test data；
The maximum charging current collection of electrokinetic cell under B, different temperatures and different state-of-charges：
The first step, electrokinetic cell are under minimum state-of-charge, with the cut-off of 1/3C constant-current discharges to battery vendors dictate
Voltage, determines electrokinetic cell charging capacity at different temperatures；
Second step, setting certain temperature conditions under, 10s is charged with current limliting 1.5C electric current to electrokinetic cell, stand
10min, with standard charging to 20% state-of-charge, stands 10min；
If in the 3rd step, second step process of the test during constant-current charge deficiency of time 10s, recovering to second step state-of-charge,
Charging current is decreased to 1.25C and proceeds, by that analogy to constant-current charge time >=10s；
If the 4th step, second step process of the test constant-current charge time >=10s, at a set temperature 20% state-of-charge with
1.5C electric currents are charged 10s to electrokinetic cell, stand 10min, charge to 40% state-of-charge with 1/3C, stand 10min；
If the 5th step, above-mentioned 4th step normally 1.5C electric currents can not charge, after standard electric discharge, go at a set temperature
10% state-of-charge is charged with 1.25C electric currents and repeats second step～the 4th step, by that analogy to constant-current charge time >=10s；
6th step, the pairs of maximum charging current values for repeating second step～the 5th step to 90% state-of-charge of design temperature are simultaneously recorded
Test data.
Claims (1)
1. a kind of cell management system of electric automobile collecting method, it is characterised in that：Comprise the steps：
The maximum discharge current collection of electrokinetic cell under A, different temperatures and different state-of-charges：
The first step, electrokinetic cell determine electrokinetic cell discharge capacity at different temperatures under fullcharging electricity condition；
Second step, under certain temperature conditions of setting, electric discharge 15s is carried out with current limliting 3C electric current to electrokinetic cell, 10min is stood,
It is discharged under 70% state-of-charge with 1/3C, stands 10min；
If in the 3rd step, above-mentioned second step process of the test during constant-current discharge deficiency of time 15s, recovering to second step state-of-charge,
Discharge current is decreased to 2.75C and proceeds, by that analogy to constant-current discharge time >=15s；
If the 4th step, above-mentioned second step process of the test constant-current discharge time >=15s, 70% state-of-charge capacity at a set temperature
Electric discharge 15s is carried out with 3C electric currents to electrokinetic cell, 10min is stood, 50% state-of-charge is discharged to 1/3C, stand 10min；
If the 5th step, above-mentioned 4th step can not normal 3C current discharges, after standard charging, go to 80% charged shape under design temperature
State repeats second step～the 4th step with 3C current discharges, by that analogy to constant-current discharge time >=15s；
6th step, the maximum discharge current value for repeating second step～the 5th step to 10% state-of-charge under design temperature simultaneously record survey
Examination data；
The maximum charging current collection of electrokinetic cell under B, different temperatures and different state-of-charges：
The first step, electrokinetic cell are under minimum state-of-charge, with the blanking voltage of 1/3C constant-current discharges to battery vendors dictate,
Determine electrokinetic cell charging capacity at different temperatures；
Second step, setting certain temperature conditions under, 10s is charged with current limliting 1.5C electric current to electrokinetic cell, stand
10min, with standard charging to 20% state-of-charge, stands 10min；
If in the 3rd step, second step process of the test during constant-current charge deficiency of time 10s, recovering to second step state-of-charge, charging
Electric current is decreased to 1.25C and proceeds, by that analogy to constant-current charge time >=10s；
If the 4th step, second step process of the test constant-current charge time >=10s, 20% state-of-charge is electric with 1.5C at a set temperature
Stream is charged 10s to electrokinetic cell, stands 10min, charges to 40% state-of-charge with 1/3C, stands 10min；
If the 5th step, above-mentioned 4th step normally 1.5C electric currents can not charge, after standard electric discharge, 10% lotus at a set temperature is gone to
Electricity condition is charged with 1.25C electric currents and repeats second step～the 4th step, by that analogy to constant-current charge time >=10s；
6th step, the pairs of maximum charging current values for repeating second step～the 5th step to 90% state-of-charge of design temperature simultaneously record test
Data.
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| CN108572321B (en) * | 2017-03-10 | 2020-10-02 | 郑州宇通客车股份有限公司 | New energy automobile and lithium ion battery safety current testing method |
| WO2021077271A1 (en) * | 2019-10-21 | 2021-04-29 | 宁德新能源科技有限公司 | Charging method, electronic device, and storage medium |
| CN111537897B (en) * | 2020-04-29 | 2022-03-15 | 深圳市飞康德电子科技有限公司 | Module capable of monitoring state of high-temperature battery in instrument in high-temperature environment |
| WO2023070321A1 (en) * | 2021-10-26 | 2023-05-04 | 宁德时代新能源科技股份有限公司 | Battery overcurrent detection method, battery management system, and battery |
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Address after: No. 181 Jianshe South Road, Zhongmou County, Zhengzhou City, Henan Province 450016 Patentee after: Zhengzhou Nissan Automotive Co., Ltd. Address before: 450016 No. eighth, 369 East Road, Zhengzhou economic and Technological Development Zone, Henan, China Patentee before: Zhengzhou Nissan Automotive Co., Ltd. |
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