CN113281667A - Power battery pack capacity testing method - Google Patents
Power battery pack capacity testing method Download PDFInfo
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- CN113281667A CN113281667A CN202110529307.0A CN202110529307A CN113281667A CN 113281667 A CN113281667 A CN 113281667A CN 202110529307 A CN202110529307 A CN 202110529307A CN 113281667 A CN113281667 A CN 113281667A
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- power battery
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- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000007600 charging Methods 0.000 claims abstract description 29
- 239000000178 monomer Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 23
- 238000007599 discharging Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 10
- 238000010277 constant-current charging Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a power battery pack capacity testing method, which comprises the following steps: step 1, obtaining coulomb efficiency eta of the power battery pack; step 2, the initial SOC value of the power battery pack when the battery cores are assembled is SOC1, the power battery pack is charged to the monomer cut-off voltage at the constant current when in SOC1, and the charging quantity is the capacity C of the power battery packNew(ii) a Step 3, comparison CNewAnd (1-SOC1) CRated capacityThe magnitude of/. eta.New≥(1‑SOC1)CRated capacityAnd eta, the capacity of the power battery pack meets the requirement, otherwise, the capacity does not meet the requirement. The capacity testing method of the power battery system, disclosed by the invention, has the advantages that the capacity testing time length of the single power battery system is shortened, and the testing efficiency is improved.
Description
Technical Field
The invention relates to the technical field of automobile power batteries, in particular to a capacity testing method for improving the delivery efficiency of a power battery.
Background
Along with the popularization and application of electric vehicles, the test work of power battery shipment is very important. Through the shipment test of the power battery, the comprehensive evaluation of the performance of the power battery can be completed.
In the prior art, the currently used method for testing the delivery capacity of the power battery is a full charge and full discharge method. The full charge and full discharge method has a simple process, and is mainly characterized in that a power battery is charged to a charge cut-off voltage by adopting a step-type charge mode, then constant-current discharge is carried out to a discharge cut-off voltage, and the available capacity of the battery is measured by using the capacity discharged in the discharge process.
The test flow is as follows: discharging at constant current till monomer cut-off voltage → charging at constant current step-type till monomer cut-off voltage → discharging at constant current till monomer cut-off voltage, judging discharge capacity → charging at constant current till shipment SOC. Taking the 1C constant current test rate as an example, a single test of a single battery pack takes about 5 hours, and the test time is multiplied and too long under the condition of multiple measurements.
On the other hand, due to the fact that the testing time is too long, the charging and discharging energy efficiency of the battery and the energy recovery efficiency of the charging and discharging testing equipment are considered, and a large amount of energy loss exists in the testing process. The testing efficiency is low, and the delivery requirement of the power batteries under the batch condition is difficult to meet. Therefore, a test method for optimizing and improving the efficiency of testing the shipment capacity of the power battery is urgently needed, and the method has great significance for the power battery test process.
Disclosure of Invention
The invention aims to solve the technical problem of realizing a method for testing the delivery capacity of a battery, and improving the delivery efficiency of a battery pack.
In order to achieve the purpose, the invention adopts the technical scheme that: a power battery pack capacity testing method comprises the following steps:
step 2, the initial SOC value of the power battery pack when the battery cores are assembled is SOC1, the power battery pack is charged to the monomer cut-off voltage at the constant current when in SOC1, and the charging quantity is the capacity C of the power battery packNew；
Step 3, comparison CNewAnd (1-SOC1) CRated capacityThe magnitude of/. eta.New≥(1-SOC1)CRated capacityEta, the power battery pack capacity meets the requirement, otherwise, the power battery pack capacity does not meet the requirementAnd (4) requiring.
And in the step 2, constant current charging adopts a constant current step type charging mode.
In the step 2, in the constant-current charging process, the charging is carried out at the intensity of 1C until the capacity of the power battery pack reaches 80% -95%, then the charging is carried out at the intensity of 0.5C until the capacity of the power battery pack reaches 100%, and then the charging is carried out at the intensity of 0.2C until the capacity of the power battery pack does not change any more, so that the stability is maintained.
And the SOC value is a known parameter calibrated by the power battery pack.
In the step 1, the charging capacity and the discharging capacity of at least five groups of power battery packs are calculated, and the percentage value obtained by dividing the charging capacity of each power battery by the discharging capacity is averaged to obtain the coulomb efficiency eta of the tested power battery pack model.
The method for testing the charging capacity and the discharging capacity of the power battery pack comprises the following steps:
1) discharging the power battery pack to a monomer cut-off voltage in a constant current manner;
2) the power battery pack is charged in a constant-current stepped mode to a monomer cut-off voltage;
3) obtaining a charging capacity from a charge amount
3) Discharging the power battery pack to a monomer cut-off voltage in a constant current manner;
4) the discharge capacity was obtained from the discharge amount.
The power battery pack for calculating the coulombic efficiency eta is provided with five groups, the five groups of power battery packs are charged in a constant-current stepped mode to the capacity C1, C2, C3, C4 and C5 of the monomer cut-off voltage, and the 5 groups of power battery packs are charged in a full-current constant-current discharging mode to the capacity C6, C7, C8, C9 and C10 of the monomer cut-off voltage; coulombic efficiency η ═ 100% (C6+ C7+ C8+ C9+ C10)/(C1+ C2+ C3+ C4+ C5).
The capacity testing method of the power battery system, disclosed by the invention, has the advantages that the capacity testing time length of the single power battery system is shortened, and the testing efficiency is improved.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
FIG. 1 is a schematic diagram of a new capacity testing process;
FIG. 2 is a schematic diagram of the old capacity testing process.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
The capacity test method for improving the delivery efficiency of the power battery pack comprises the following steps:
generally, a certain power battery system is randomly selected for capacity testing, and the technical route of the testing method is as follows: and adjusting the electric quantity of the power battery system, and calculating the capacity of the power battery system by comparing the charge states of the power battery system before and after adjustment, wherein the method for adjusting the electric quantity of the power battery system is to charge or discharge the power battery system.
For example, five power battery packs are tested, and the capacity of the dead current stepped charging to the cell cut-off voltage is C1, C2, C3, C4 and C5; the 5 groups of power batteries comprise capacities C6, C7, C8, C9 and C10 which are fully charged, discharged at constant current and discharged to the cut-off voltage of the single batteries;
step 2, calculating the coulombic efficiency, and calculating the coulombic efficiency eta (C6+ C7+ C8+ C9+ C10)/(C1+ C2+ C3+ C4+ C5) 100% by the obtained data;
step 3, measuring and recording an initial SOC value when the battery cores are matched: SOC1, initial SOC constant current step charging to monomer cut-off voltage, obtaining the battery shipment capacity Cnew measured according to new process step;
and 4, setting the standard of the shipment volume to meet the following requirements: the Cnew is more than or equal to (1-SOC1) C rated capacity/eta, namely, if the Cnew is more than or equal to (1-SOC1) C rated capacity/eta, the capacity of the power battery meets the requirement, otherwise, the capacity does not meet the requirement.
The specific real-time mode 1:
the step test using fig. 2 yields the following data:
| PACK1 | PACK2 | PACK3 | PACK4 | PACK5 | |
| charging capacity/Ah | 139.1 | 136.34 | 137.05 | 138.89 | 139.10 |
| Discharge capacity/Ah | 138.335 | 134.17 | 135.8 | 137.32 | 138.34 |
Obtaining: eta 98.9%
The battery is known to have a capacity of 3% SOC and a rated capacity of 135Ah when assembled, and C can be obtainedNew≥(1-SOC1)CRated capacityWhen the eta is 132.4Ah, the power battery pack meets the requirement. And a charging capacity C according to the process step of FIG. 1NewWhen the discharge time is more than or equal to 132Ah, the power battery meets the discharge requirement.
The following data were tested using the procedure of FIG. 1:
| PACK1 | PACK2 | PACK3 | PACK4 | PACK5 | |
| charging capacity/Ah | 134.1 | 132.6 | 133.05 | 134.5 | 134.5 |
Therefore, the method for testing the capacity of the power battery system is capable of reducing the time length for testing the capacity of the power battery system in a single time and improving the testing efficiency, the testing method not only greatly reduces the electric quantity loss, but also is simple and easy to implement in the testing process and greatly saves the testing cost.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (7)
1. A power battery pack capacity testing method is characterized by comprising the following steps:
step 1, obtaining coulomb efficiency eta of the power battery pack;
step 2, the initial SOC value of the power battery pack when the battery cores are assembled is SOC1, the power battery pack is charged to the monomer cut-off voltage at the constant current when in SOC1, and the charging quantity is the capacity C of the power battery packNew；
Step 3, comparison CNewAnd (1-SOC1) CRated capacityThe magnitude of/. eta.New≥(1-SOC1)CRated capacityAnd eta, the capacity of the power battery pack meets the requirement, otherwise, the capacity does not meet the requirement.
2. The power battery pack capacity testing method according to claim 1, characterized in that: in the step 1, the charging capacity and the discharging capacity of at least five groups of power battery packs are calculated, and the percentage value obtained by dividing the charging capacity of each power battery by the discharging capacity is averaged to obtain the coulomb efficiency eta of the tested power battery pack model.
3. The power battery pack capacity testing method according to claim 2, characterized in that: the method for testing the charging capacity and the discharging capacity of the power battery pack comprises the following steps:
1) discharging the power battery pack to a monomer cut-off voltage in a constant current manner;
2) the power battery pack is charged in a constant-current stepped mode to a monomer cut-off voltage;
3) obtaining a charging capacity from a charge amount
3) Discharging the power battery pack to a monomer cut-off voltage in a constant current manner;
4) the discharge capacity was obtained from the discharge amount.
4. The power battery pack capacity testing method according to claim 3, characterized in that: the power battery pack for calculating the coulombic efficiency eta is provided with five groups, the five groups of power battery packs are charged in a constant-current stepped mode to the capacity C1, C2, C3, C4 and C5 of the monomer cut-off voltage, and the 5 groups of power battery packs are charged in a full-current constant-current discharging mode to the capacity C6, C7, C8, C9 and C10 of the monomer cut-off voltage; coulombic efficiency η ═ 100% (C6+ C7+ C8+ C9+ C10)/(C1+ C2+ C3+ C4+ C5).
5. The power battery pack capacity testing method according to any one of claims 1 to 4, characterized in that: and in the step 2, constant current charging adopts a constant current step type charging mode.
6. The power battery pack capacity testing method according to claim 5, characterized in that: in the step 2, in the constant-current charging process, the charging is carried out at the intensity of 1C until the capacity of the power battery pack reaches 80% -95%, then the charging is carried out at the intensity of 0.5C until the capacity of the power battery pack reaches 100%, and then the charging is carried out at the intensity of 0.2C until the capacity of the power battery pack does not change any more, so that the stability is maintained.
7. The power battery pack capacity testing method according to claim 6, characterized in that: and the SOC value is a known parameter calibrated by the power battery pack.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5539318A (en) * | 1992-07-16 | 1996-07-23 | Toyota Jidosha Kabushiki Kaisha | Residual capacity meter for electric car battery |
| US5614804A (en) * | 1993-12-27 | 1997-03-25 | Honda Giken Kogyo Kabushiki Kaisha | Method of detecting residual capacity of battery for use on electric vehicle |
| KR20120037682A (en) * | 2010-10-12 | 2012-04-20 | 삼성에스디아이 주식회사 | Battery pack, controlling method of the same, and power storage system including the battery pack |
| CN102854470A (en) * | 2012-08-31 | 2013-01-02 | 哈尔滨工业大学 | Measurement method for estimating actual available capacity by SOC (state of charge) of power battery set |
| CN106515479A (en) * | 2016-11-07 | 2017-03-22 | 盐城工学院 | Online capacity optimization device for electric vehicle storage battery pack |
| CN107271913A (en) * | 2017-06-28 | 2017-10-20 | 北京工业大学 | A kind of method predicted applied to electrokinetic cell residual capacity |
| CN108333526A (en) * | 2018-01-30 | 2018-07-27 | 北京车和家信息技术有限公司 | Battery capacity check method and device |
| CN108732503A (en) * | 2017-04-21 | 2018-11-02 | 郑州宇通客车股份有限公司 | A kind of cell health state and battery capacity check method and device |
| CN109669143A (en) * | 2019-01-30 | 2019-04-23 | 中航锂电（洛阳）有限公司 | A kind of battery capacity evaluating method |
-
2021
- 2021-05-14 CN CN202110529307.0A patent/CN113281667A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5539318A (en) * | 1992-07-16 | 1996-07-23 | Toyota Jidosha Kabushiki Kaisha | Residual capacity meter for electric car battery |
| US5614804A (en) * | 1993-12-27 | 1997-03-25 | Honda Giken Kogyo Kabushiki Kaisha | Method of detecting residual capacity of battery for use on electric vehicle |
| KR20120037682A (en) * | 2010-10-12 | 2012-04-20 | 삼성에스디아이 주식회사 | Battery pack, controlling method of the same, and power storage system including the battery pack |
| CN102854470A (en) * | 2012-08-31 | 2013-01-02 | 哈尔滨工业大学 | Measurement method for estimating actual available capacity by SOC (state of charge) of power battery set |
| CN106515479A (en) * | 2016-11-07 | 2017-03-22 | 盐城工学院 | Online capacity optimization device for electric vehicle storage battery pack |
| CN108732503A (en) * | 2017-04-21 | 2018-11-02 | 郑州宇通客车股份有限公司 | A kind of cell health state and battery capacity check method and device |
| CN107271913A (en) * | 2017-06-28 | 2017-10-20 | 北京工业大学 | A kind of method predicted applied to electrokinetic cell residual capacity |
| CN108333526A (en) * | 2018-01-30 | 2018-07-27 | 北京车和家信息技术有限公司 | Battery capacity check method and device |
| CN109669143A (en) * | 2019-01-30 | 2019-04-23 | 中航锂电（洛阳）有限公司 | A kind of battery capacity evaluating method |
Non-Patent Citations (1)
| Title |
|---|
| 陈岚 等: "修正参数的安时法估算锂离子电池剩余电量", 上海应用技术学院学报(自然科学版), vol. 14, no. 4, 30 December 2014 (2014-12-30), pages 310 - 313 * |
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