CN107505575B - Rapid assessment method for retired power battery - Google Patents
Rapid assessment method for retired power battery Download PDFInfo
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- CN107505575B CN107505575B CN201710679940.1A CN201710679940A CN107505575B CN 107505575 B CN107505575 B CN 107505575B CN 201710679940 A CN201710679940 A CN 201710679940A CN 107505575 B CN107505575 B CN 107505575B
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The invention relates to the technical field of battery evaluation, and discloses a rapid evaluation method for a retired power battery. The method comprises the following steps: step 1, placing a decommissioned battery pack on a test board, and firstly, measuring the capacity of the decommissioned battery pack by using charge and discharge equipment; step 2, measuring the power and the internal resistance when the residual electric quantity of the retired battery pack is 20%; step 3, fully charging the retired battery pack, and standing for 1 week; and 4, finally, measuring the self-discharge rate of the retired battery pack. The testing time of the retired power battery is shortened from 1-2 months to about 1 week, the switching time of testing among evaluation parameters is remarkably shortened, and the state evaluation efficiency of the retired battery pack is greatly improved; secondly, the accuracy of the obtained state parameters of the retired battery is greatly guaranteed.
Description
Technical Field
The invention relates to the technical field of battery evaluation, in particular to a rapid evaluation method for a retired power battery.
Background
When the battery is used for a period of time and the capacity of the battery when fully charged is less than 80% of the rated capacity of the battery, the battery should be replaced. Therefore, for a decommissioned battery pack, it is first necessary to determine its actual capacity after decommissioning. As the capacity of the battery decreases, the internal resistance of the retired battery pack generally increases, the discharge power of the battery also changes, and the consistency and charge retention capability of the battery deteriorate as compared with a new battery.
Therefore, the state evaluation of the retired battery pack needs to synthesize the capacity, the internal resistance, the power, the self-discharge rate and the battery consistency to obtain a comprehensive evaluation index. And the test of key parameters such as capacity, internal resistance, power, self-discharge rate, battery consistency and the like usually needs 1-2 months of test time, which greatly hinders the large-scale utilization of retired power batteries.
Secondly, most of the existing research on power state estimation mainly focuses on the research on the battery model and the state estimation algorithm, and a large amount of test data is also needed to verify the correctness of the battery model and the state estimation algorithm in the early stage. For the retired power battery, the service conditions before retirement are very different, so that it is difficult to evaluate the state of the retired power battery by using a unified battery model and a state estimation algorithm.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems, the invention provides a rapid assessment method for retired power batteries by extracting the key assessment factors for assessing the power batteries and designing a set of simple and rapid test method, aiming at achieving the purpose of rapidly assessing the retired power batteries.
The technical scheme adopted by the invention is as follows: a rapid assessment method for retired power batteries comprises the following processes: step 1, placing a decommissioned battery pack on a test board, and firstly, measuring the capacity of the decommissioned battery pack by using charge and discharge equipment; step 2, measuring the power and the internal resistance when the residual electric quantity of the retired battery pack is 20%; step 3, fully charging the retired battery pack, and standing for 1 week; and 4, finally, measuring the self-discharge rate of the retired battery pack.
Further, the specific process of step 1 includes: step 11, enabling the retired battery pack to reach a workbench 1 of the test bench, discharging the retired battery pack to a cut-off condition of the battery pack with a current of 1C, and standing for half an hour; step 12, charging the retired battery pack at a current of 0.5C, and standing for half an hour; and step 13, discharging the retired battery pack by using the current of 1C, wherein the capacity discharged by the retired battery pack is the actual capacity of the retired battery pack, and acquiring the actual capacity of the retired battery pack.
Further, the rapid evaluation method for the retired power battery further comprises the following processes: and after the step 1 is finished, detecting and acquiring all the monomer voltage conditions of the retired battery pack by using a primary battery management system of the retired battery pack.
Further, the specific process of step 2 includes: the retired battery pack arrives at a workbench 2 on the test bench from the workbench 1, the retired battery pack is charged or discharged with 1C current until the residual electric quantity is 20%, and the retired battery pack stands for half an hour; and then, carrying out power and internal resistance test on the retired battery pack by using the current of 1C to obtain the power and internal resistance when the residual electric quantity of the retired battery pack is 20%, and recording.
Further, in the step 3, after the retired battery pack is fully charged, the retired battery pack is placed in a standing storage area on the test bench from the workbench 2, and then is placed for 1 week.
Further, the specific process of step 4 includes: the retired battery pack reaches a workbench 3 of the test bench from the standing storage area, the retired battery pack is discharged to cut-off voltage by using 1C current, and the ratio of the capacity discharged by the retired battery pack to the actual capacity of the retired battery pack is the self-discharge rate of the retired battery pack.
Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows:
1. by establishing a set of test assembly line, the actual capacity, the voltage consistency, the power, the internal resistance and the self-discharge rate are respectively tested on the assembly line, the test time of the common retired power battery is shortened from 1-2 months to about 1 week, the test switching time among evaluation parameters is obviously simplified, and the state evaluation efficiency of the retired battery pack is greatly improved.
2. According to the invention, by extracting the key parameters of the retired power battery, a simple and rapid test method is formulated, the key test indexes of each retired battery pack are directly measured, and the accuracy of the obtained state parameters of the retired battery is greatly ensured.
Drawings
Fig. 1 is a schematic flow chart of the rapid evaluation method for retired power battery of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a pipeline test bench is provided for the measurement of the retired battery pack, and the actual capacity, voltage consistency, power and internal resistance are measured on different work benches respectively, and the parameters of the self-discharge rate are evaluated. The device is sequentially provided with a workbench 1, a workbench 2, a standing storage area and a workbench 3. The working table 1 is provided with a set of power supply and load equipment, so that the capacity test of the battery is completed through charging and discharging; the workbench 2 is provided with power and internal resistance testing equipment for completing the discharge capability test of the battery under the condition of low residual charge (SOC); a separate load device is provided at the table 3 in order to complete the self-discharge of the battery after one week of standing.
1. Obtaining the actual capacity of the retired battery pack
The retired battery pack reaches a workbench 1 of the test bench, the retired battery pack is discharged to the cut-off condition of the battery pack at the current of 1C, and the retired battery pack is kept still for half an hour; charging the retired battery pack at a current of 0.5 ℃, and standing for half an hour; and discharging the retired battery pack by using the current of 1C, wherein the capacity discharged by the retired battery pack is the actual capacity of the retired battery pack, the actual capacity is the residual capacity of the retired battery pack during retirement, and the actual capacity of the retired battery pack is obtained. And simultaneously, detecting and acquiring all the monomer voltage conditions of the retired battery pack by adopting a primary battery management system of the retired battery pack.
2. Determining retired battery pack power and internal resistance
For the power measurement of the retired battery pack, only power under low residual electricity quantity (SOC) is needed, in this embodiment, the SOC is selected to be 20%, the retired battery pack reaches the workbench 2 on the test bench from the workbench 1, the retired battery pack is charged or discharged with a current of 1C until the residual electricity quantity is 20%, and the retired battery pack is kept for half an hour; and then, testing the power and the internal resistance of the retired battery pack by using the current of 1C, wherein the testing process can refer to the power and internal resistance testing working conditions in the national standard GB/T31467.2-2015 to obtain the power and the internal resistance when the residual electric quantity of the retired battery pack is 20%, and recording the power and the internal resistance.
3. And after the power and the internal resistance are measured, fully charging the retired battery pack, then enabling the retired battery pack to reach a standing storage area, and standing for 1 week.
The standing storage area comprises a battery rack for placing retired battery packs, and the battery packs tested from the workbench 2 enter the standing storage area along with the conveyor belt and are sequentially placed on the battery rack. After the battery pack on the workbench 3 is tested and leaves the workbench 3 and the standing time is set, the battery racks in the standing storage area sequentially send the battery packs to be subjected to the self-discharge test to the conveyor belt. Therefore, the standing storage area can ensure that the retired battery pack can smoothly complete various tests.
4. Determining the self-discharge rate of a decommissioned battery pack
The retired battery pack reaches a workbench 3 of the test bench from the standing storage area, the retired battery pack is discharged to cut-off voltage by using 1C current, and the ratio of the capacity discharged by the retired battery pack to the actual capacity of the retired battery pack is the self-discharge rate of the retired battery pack.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed. Those skilled in the art to which the invention pertains will appreciate that insubstantial changes or modifications can be made without departing from the spirit of the invention as defined by the appended claims.
Claims (4)
1. A rapid assessment method for retired power batteries is characterized by comprising the following processes: step 1, placing a decommissioned battery pack on a test bench, firstly, enabling the decommissioned battery pack to reach a workbench 1, and measuring the capacity of the decommissioned battery pack by using charge and discharge equipment; step 2, the retired battery pack reaches a workbench 2 on the test board from the workbench 1, and then the power and the internal resistance of the retired battery pack are measured when the residual electric quantity of the retired battery pack is 20%; step 3, fully charging the retired battery pack, and standing for 1 week; step 4, the ex-service battery pack reaches a workbench 3 of the test bench from the standing storage area, and finally the self-discharge rate of the ex-service battery pack is measured;
the specific process of the step 1 comprises the following steps: step 11, enabling the retired battery pack to reach a workbench 1 of the test bench, discharging the retired battery pack to the cut-off voltage of the battery pack with the current of 1C, and standing for half an hour; step 12, charging the retired battery pack at a current of 0.5C, and standing for half an hour; step 13, discharging the retired battery pack by using the current of 1C, wherein the capacity discharged by the retired battery pack is the actual capacity of the retired battery pack, and acquiring the actual capacity of the retired battery pack;
the specific process of the step 2 comprises the following steps: the retired battery pack arrives at a workbench 2 on the test bench from the workbench 1, the retired battery pack is charged or discharged with 1C current until the residual electric quantity is 20%, and the retired battery pack stands for half an hour; and then, carrying out power and internal resistance test on the retired battery pack by using the current of 1C to obtain the power and internal resistance when the residual electric quantity of the retired battery pack is 20%, and recording.
2. The method for rapid evaluation of retired power battery as claimed in claim 1, wherein the method for rapid evaluation of retired power battery further comprises the following process: and after the step 1 is finished, detecting and acquiring all the monomer voltage conditions of the retired battery pack by using a primary battery management system of the retired battery pack.
3. The method for rapid evaluation of retired power battery as claimed in claim 2, wherein in step 3, after the retired battery pack is fully charged, the retired battery pack is placed from the workbench 2 to a static storage area on the testing platform and then is left to stand for 1 week.
4. The method for rapidly evaluating retired power battery as claimed in claim 3, wherein the specific process of step 4 comprises: the retired battery pack reaches a workbench 3 of the test bench from the standing storage area, the retired battery pack is discharged to cut-off voltage by using 1C current, and the ratio of the capacity discharged by the retired battery pack to the actual capacity of the retired battery pack is the self-discharge rate of the retired battery pack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710679940.1A CN107505575B (en) | 2017-08-10 | 2017-08-10 | Rapid assessment method for retired power battery |
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| CN201710679940.1A CN107505575B (en) | 2017-08-10 | 2017-08-10 | Rapid assessment method for retired power battery |
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| CN107505575A CN107505575A (en) | 2017-12-22 |
| CN107505575B true CN107505575B (en) | 2020-06-02 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110687463A (en) * | 2018-07-04 | 2020-01-14 | 中国电力科学研究院有限公司 | Working condition adaptability evaluation method and device for retired power battery |
| CN109450029B (en) * | 2018-11-26 | 2022-04-08 | 暨南大学 | Energy storage method and energy storage circuit for retired power battery |
| CN111562509B (en) * | 2020-04-03 | 2022-09-09 | 中国电力科学研究院有限公司 | Method and system for determining residual life of retired power battery |
| CN117577977B (en) * | 2024-01-17 | 2024-04-19 | 深圳市杰成镍钴新能源科技有限公司 | Whole-pack recycling control method for retired battery pack |
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| US6850036B2 (en) * | 2003-02-26 | 2005-02-01 | Handsun Electronic Enterprise Co., Ltd. | Method for checking power status of batteries |
| CN103326076A (en) * | 2013-05-24 | 2013-09-25 | 国家电网公司 | A method for recycling a power battery |
| CN105983542A (en) * | 2015-02-13 | 2016-10-05 | 国家电网公司 | Battery classifying method of retired electric cars |
| CN106125001A (en) * | 2016-08-22 | 2016-11-16 | 上海电力学院 | The fast evaluation method of electric automobile retired battery module actual capacity |
| CN106443475A (en) * | 2016-10-21 | 2017-02-22 | 国网山东省电力公司电力科学研究院 | Retired power battery dismounting-free reuse screening method based on operation big data |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6850036B2 (en) * | 2003-02-26 | 2005-02-01 | Handsun Electronic Enterprise Co., Ltd. | Method for checking power status of batteries |
| CN103326076A (en) * | 2013-05-24 | 2013-09-25 | 国家电网公司 | A method for recycling a power battery |
| CN105983542A (en) * | 2015-02-13 | 2016-10-05 | 国家电网公司 | Battery classifying method of retired electric cars |
| CN106125001A (en) * | 2016-08-22 | 2016-11-16 | 上海电力学院 | The fast evaluation method of electric automobile retired battery module actual capacity |
| CN106443475A (en) * | 2016-10-21 | 2017-02-22 | 国网山东省电力公司电力科学研究院 | Retired power battery dismounting-free reuse screening method based on operation big data |
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