CN104391251A - 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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- CN104391251A CN104391251A CN201410657150.XA CN201410657150A CN104391251A CN 104391251 A CN104391251 A CN 104391251A CN 201410657150 A CN201410657150 A CN 201410657150A CN 104391251 A CN104391251 A CN 104391251A
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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, especially relate to cell management system of electric automobile collecting method.
Background technology
Along with day by day increasing the weight of of global energy crisis and environmental pollution, the development of pure electric automobile has become one of future automobile industrial development direction.Power battery pack is the important component part of electric automobile, directly affects the multinomial performances such as the starting of electric automobile, acceleration, climbing and distance travelled.Therefore, to the maximum charging current of electrokinetic cell and the test of discharge current under different temperatures and different state-of-charge (SOC), and test result and battery management system (BMS) are associated, make the better management and supervision battery performance of battery management system, prevent electrokinetic cell super-charge super-discharge electricity, improve power brick global consistency, and then the life-span, comprehensively the assurance electric automobile whole performance that improve electrokinetic cell and car load become particularly important.
Summary of the invention
The object of the invention is to provide 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-charge:
The first step, electrokinetic cell determine electrokinetic cell discharge capacity at different temperatures under being in fullcharging electricity condition;
Second step, under certain temperature conditions of setting, with current limliting 3C electric current, electric discharge 15s is carried out to electrokinetic cell, leave standstill 10min, under being discharged to 70% state-of-charge with 1/3C, standing 10min;
If in the above-mentioned second step process of the test of the 3rd step during constant-current discharge deficiency of time 15s, return 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 carries out electric discharge 15s with 3C electric current to electrokinetic cell at a set temperature, leave standstill 10min, be discharged to 50% state-of-charge with 1/3C, leave standstill 10min;
If above-mentioned 4th step of the 5th step can not normal 3C current discharge, after standard charging, under going to design temperature, 80% state-of-charge repeats second step ~ the 4th step with 3C current discharge, by that analogy to constant-current discharge time >=15s;
6th step, repeat 10% state-of-charge under second step ~ the 5th step to design temperature maximum discharge current value and record test data;
The maximum charging current collection of electrokinetic cell under B, different temperatures and different state-of-charge:
Under the first step, electrokinetic cell are in minimum state-of-charge, with 1/3C constant-current discharge to the cut-off voltage of battery vendors dictate, determine electrokinetic cell charging capacity at different temperatures;
Second step, under certain temperature conditions of setting, with current limliting 1.5C electric current, charging 10s is carried out to electrokinetic cell, leave standstill 10min, with standard charging to 20% state-of-charge, standing 10min;
If in the 3rd step second step process of the test during constant-current charge deficiency of time 10s, return 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, 20% state-of-charge carries out charging 10s with 1.5C electric current to electrokinetic cell at a set temperature, leave standstill 10min, charge to 40% state-of-charge with 1/3C, leave standstill 10min;
If above-mentioned 4th step of the 5th step can not normal 1.5C current charges, after standard electric discharge, go to 10% state-of-charge at a set temperature and repeat second step ~ the 4th step with 1.25C current charges, by that analogy to constant-current charge time >=10s;
6th step, repeat second step ~ the 5th step to the pairs of maximum charging current values of design temperature 90% state-of-charge and record test data.
The invention has the advantages that to gather simple and fast, test duration to described electrokinetic cell parameter testing short.By in the data inputting cell management system of electric automobile of collection, namely cell management system of electric automobile obtains different temperatures by searching, the maximum charging current of electrokinetic cell and discharge current under different state-of-charge, under different road condition, required maximum output is travelled and regenerative braking feedback power provides foundation for car load, also the performance of the better management and supervision electrokinetic cell of cell management system of electric automobile is convenient to, especially electrokinetic cell can be protected to a greater extent under high temperature and low temperature environment, prevent from overcharging, overdischarge, improve the consistance of power brick entirety, and then improve the life-span of electrokinetic cell and car load.
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-charge:
The first step, electrokinetic cell determine electrokinetic cell discharge capacity at different temperatures under being in fullcharging electricity condition;
Second step, under certain temperature conditions of setting, with current limliting 3C electric current, electric discharge 15s is carried out to electrokinetic cell, leave standstill 10min, under being discharged to 70% state-of-charge with 1/3C, standing 10min;
If in the above-mentioned second step process of the test of the 3rd step during constant-current discharge deficiency of time 15s, return 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 carries out electric discharge 15s with 3C electric current to electrokinetic cell at a set temperature, leave standstill 10min, be discharged to 50% state-of-charge with 1/3C, leave standstill 10min;
If above-mentioned 4th step of the 5th step can not normal 3C current discharge, after standard charging, under going to design temperature, 80% state-of-charge repeats second step ~ the 4th step with 3C current discharge, by that analogy to constant-current discharge time >=15s;
6th step, repeat 10% state-of-charge under second step ~ the 5th step to design temperature maximum discharge current value and record test data;
The maximum charging current collection of electrokinetic cell under B, different temperatures and different state-of-charge:
Under the first step, electrokinetic cell are in minimum state-of-charge, with 1/3C constant-current discharge to the cut-off voltage of battery vendors dictate, determine electrokinetic cell charging capacity at different temperatures;
Second step, under certain temperature conditions of setting, with current limliting 1.5C electric current, charging 10s is carried out to electrokinetic cell, leave standstill 10min, with standard charging to 20% state-of-charge, standing 10min;
If in the 3rd step second step process of the test during constant-current charge deficiency of time 10s, return 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, 20% state-of-charge carries out charging 10s with 1.5C electric current to electrokinetic cell at a set temperature, leave standstill 10min, charge to 40% state-of-charge with 1/3C, leave standstill 10min;
If above-mentioned 4th step of the 5th step can not normal 1.5C current charges, after standard electric discharge, go to 10% state-of-charge at a set temperature and repeat second step ~ the 4th step with 1.25C current charges, by that analogy to constant-current charge time >=10s;
6th step, repeat second step ~ the 5th step to the pairs of maximum charging current values of design temperature 90% state-of-charge and record test data.
Claims (1)
1. a cell management system of electric automobile collecting method, is characterized in that: comprise the steps:
The maximum discharge current collection of electrokinetic cell under A, different temperatures and different state-of-charge:
The first step, electrokinetic cell determine electrokinetic cell discharge capacity at different temperatures under being in fullcharging electricity condition;
Second step, under certain temperature conditions of setting, with current limliting 3C electric current, electric discharge 15s is carried out to electrokinetic cell, leave standstill 10min, under being discharged to 70% state-of-charge with 1/3C, standing 10min;
If in the above-mentioned second step process of the test of the 3rd step during constant-current discharge deficiency of time 15s, return 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 carries out electric discharge 15s with 3C electric current to electrokinetic cell at a set temperature, leave standstill 10min, be discharged to 50% state-of-charge with 1/3C, leave standstill 10min;
If above-mentioned 4th step of the 5th step can not normal 3C current discharge, after standard charging, under going to design temperature, 80% state-of-charge repeats second step ~ the 4th step with 3C current discharge, by that analogy to constant-current discharge time >=15s;
6th step, repeat 10% state-of-charge under second step ~ the 5th step to design temperature maximum discharge current value and record test data;
The maximum charging current collection of electrokinetic cell under B, different temperatures and different state-of-charge:
Under the first step, electrokinetic cell are in minimum state-of-charge, with 1/3C constant-current discharge to the cut-off voltage of battery vendors dictate, determine electrokinetic cell charging capacity at different temperatures;
Second step, under certain temperature conditions of setting, with current limliting 1.5C electric current, charging 10s is carried out to electrokinetic cell, leave standstill 10min, with standard charging to 20% state-of-charge, standing 10min;
If in the 3rd step second step process of the test during constant-current charge deficiency of time 10s, return 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, 20% state-of-charge carries out charging 10s with 1.5C electric current to electrokinetic cell at a set temperature, leave standstill 10min, charge to 40% state-of-charge with 1/3C, leave standstill 10min;
If above-mentioned 4th step of the 5th step can not normal 1.5C current charges, after standard electric discharge, go to 10% state-of-charge at a set temperature and repeat second step ~ the 4th step with 1.25C current charges, by that analogy to constant-current charge time >=10s;
6th step, repeat second step ~ the 5th step to the pairs of maximum charging current values of design temperature 90% state-of-charge and record test data.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108572321A (en) * | 2017-03-10 | 2018-09-25 | 郑州宇通客车股份有限公司 | A kind of new-energy automobile and lithium ion battery safe current test method |
| CN111537897A (en) * | 2020-04-29 | 2020-08-14 | 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 |
| CN112272908A (en) * | 2019-10-21 | 2021-01-26 | 宁德新能源科技有限公司 | Charging method, electronic device, and storage medium |
| 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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| 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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