CN115343639A - Method for testing self-discharge of battery - Google Patents
Method for testing self-discharge of battery Download PDFInfo
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- CN115343639A CN115343639A CN202210890203.7A CN202210890203A CN115343639A CN 115343639 A CN115343639 A CN 115343639A CN 202210890203 A CN202210890203 A CN 202210890203A CN 115343639 A CN115343639 A CN 115343639A
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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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- 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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- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application relates to a test method for self-discharge of a battery, which comprises the following steps: charging the battery after capacity grading treatment until the battery capacity corresponding to the battery after capacity grading treatment reaches a preset charge state; carrying out first standing treatment on the charged battery at a preset temperature for a first preset time period; measuring a first open-circuit voltage corresponding to the battery after the first standing treatment, and marking the corresponding time as first preset time; carrying out second standing treatment on the battery subjected to the first standing treatment at a preset temperature for a second preset time period, wherein the length of the second preset time period is greater than that of the first preset time period; measuring a second open-circuit voltage corresponding to the battery after the second standing treatment, and marking the corresponding time as second preset time; and evaluating the self-discharge performance of the battery subjected to the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage, so that the self-discharge test accuracy of the battery is improved on the whole.
Description
Technical Field
The application relates to the field of battery testing, in particular to a method for testing self-discharge of a battery.
Background
At present, lithium batteries for power storage are widely concerned and applied. Among them, the difference and consistency of battery performance are more important factors affecting the normal operation of the battery. However, the difference of materials, processes and process capability of lithium battery manufacturers makes the screening and determination of the consistency of products of the same type more important. Wherein self-discharge performance is an important performance difference.
Among them, there are many reasons for the self-discharge difference, mainly including self-discharge caused by internal micro-short circuit and the reduction of redox capacity of the electrode solution at the positive and negative electrodes. After a battery with inconsistent self-discharge performance is stored for a period of time, a large difference in SOC (State of Charge) occurs, which greatly affects its capacity and safety. Therefore, the self-discharge performance of the battery needs to be tested to screen out the abnormal battery, and the detection accuracy of the self-discharge performance of the battery is particularly important.
Disclosure of Invention
In view of this, the present application provides a method for testing self-discharge of a battery, which can greatly improve the accuracy of detecting the self-discharge capability of the battery.
The test method comprises the following steps:
charging the battery after capacity grading treatment until the battery capacity corresponding to the battery after capacity grading treatment reaches a preset charge state;
carrying out first standing treatment on the charged battery at a preset temperature for a first preset time period;
measuring a first open-circuit voltage corresponding to the battery after the first standing treatment, and marking the corresponding time as first preset time;
carrying out second standing treatment on the battery subjected to the first standing treatment at a preset temperature for a second preset time period, wherein the length of the second preset time period is greater than that of the first preset time period;
measuring a second open-circuit voltage corresponding to the battery subjected to the second standing treatment, and marking the corresponding time as second preset time;
and evaluating the self-discharge performance of the battery after the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage.
In one embodiment, the current for constant current charging is 0.1C-0.8C.
In one embodiment, the first predetermined period of time is between 0 and 5 days.
In one embodiment, the second predetermined period of time is 1 to 5 days.
In one embodiment, the sum of the first preset period of time and the second preset period of time is less than or equal to 5 days.
In one embodiment, the first predetermined period of time is 2 days and the second predetermined period of time is 3 days.
In one embodiment, the predetermined state of charge is a state of charge of 1-5%.
In one embodiment, the predetermined state of charge is a 3% state of charge.
In one embodiment, the process of evaluating the self-discharge performance of the battery after the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage includes:
calculating the self-discharge rate of the battery subjected to the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage;
and comparing the self-discharge rate with a preset self-discharge rate threshold value so as to evaluate the self-discharge performance of the battery after the second standing treatment.
In one embodiment, the step of calculating the self-discharge rate of the battery after the second standing treatment uses the following formula:
K＝(OCV 1 -OCV 2 )/(T 2 -T 1 )
wherein K is the self-discharge rate and OCV of the battery after the second standing treatment 1 First open circuit voltage, OCV 2 Is a second open circuit voltage, T 1 For a first predetermined time, T 2 When it is the second presetAnd (3) removing the solvent.
The testing method comprises the steps of charging the batteries subjected to capacity grading treatment until the battery capacity corresponding to the batteries subjected to capacity grading treatment reaches a preset charge state, then carrying out first standing treatment on the charged batteries at a preset temperature for a first preset time period, measuring a first open-circuit voltage corresponding to the batteries subjected to the first standing treatment, marking the corresponding time as first preset time, further carrying out second standing treatment on the batteries subjected to the first standing treatment at the preset temperature for a second preset time period, wherein the length of the second preset time period is greater than that of the first preset time period, measuring a second open-circuit voltage corresponding to the batteries subjected to the second standing treatment, marking the corresponding time as second preset time, and evaluating the self-discharge performance of the batteries subjected to the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage, through the standing treatment of the two time periods, wherein the standing treatment of the first preset time period can take the characteristic that the voltage drop of each battery in the initial stage is relatively fast into consideration, and the standing treatment of the second preset time period can overcome the defect that the voltage drop of each battery is relatively fast when the standing treatment of the first preset time period is singly depended on so as to be not beneficial to the subsequent discharge performance judgment to screen the abnormal battery, at the moment, because the length of the second preset time period is longer than that of the first preset time period, the voltage of the abnormal battery is reduced faster than that of the normal battery in the second preset time period, and further the foundation can be laid for the subsequent self-discharge performance judgment of the battery to screen the abnormal battery, the accuracy of the self-discharge test is generally improved, the charging and discharging process is simplified, the energy consumption is saved, and therefore the self-discharge performance of each battery is rapidly judged to screen the abnormal battery, further saving storage time and inventory pressure for the battery.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for testing self-discharge of a battery according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of open-circuit voltages of three static-treated batteries at different charging currents according to an embodiment of the present application;
FIG. 3 is a schematic diagram of voltage drop of each of three batteries as a function of time according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a method for evaluating self-discharge performance of a battery after a second standing treatment according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a charging curve of a battery according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a differential capacity curve of a battery according to an embodiment of the present application;
fig. 7 is an enlarged partial schematic view of a differential capacity curve of the battery of fig. 6.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. Based on the embodiments in the present application. The following embodiments and their technical features may be combined with each other without conflict.
As shown in fig. 1, a method for testing self-discharge of a battery is provided, which can greatly improve the accuracy of detecting the self-discharge capability of the battery, and the method includes:
step S110, the capacity-classified battery is charged until the battery capacity corresponding to the capacity-classified battery reaches a preset state of charge.
After the battery is subjected to formation treatment according to a normal flow, the battery after capacity grading treatment needs to be charged first until the battery capacity corresponding to the battery after capacity grading treatment reaches a preset charge state.
And step S120, performing first standing treatment on the charged battery at a preset temperature for a first preset time period.
The initial-stage battery voltage drop of each charged battery is relatively fast at the preset temperature, and the abnormal batteries are not easy to screen through the voltage drop and the speed of the battery voltage drop at the moment, so that the first standing treatment in the first preset time period is usually carried out firstly.
The predetermined temperature is usually 25 ℃ to 37 ℃, preferably 25 ℃.
Step S130, a first open-circuit voltage corresponding to the battery after the first standing processing is measured, and the corresponding time is marked as a first preset time.
After the first standing treatment, the voltage drop of each battery is reduced to a greater extent, and at this time, to measure the self-discharge performance of each battery, it is necessary to further measure the first open-circuit voltage corresponding to the battery, and mark the corresponding time as the first preset time.
Among them, the battery having the qualified self-discharge performance is called a normal battery, and the battery having the unqualified self-discharge performance is called an abnormal battery.
Step S140, performing a second standing treatment on the battery after the first standing treatment at a preset temperature for a second preset time period, where the second preset time period is greater than the first preset time period.
The reason is that the second time period is greater than the first preset time period, and at the moment, the voltage of the abnormal battery is reduced faster in the second preset time period than that of the normal battery (namely, the voltage drop of the normal battery in the second preset time period is relatively smaller), so that a foundation can be laid for screening the abnormal battery for subsequent judgment of the self-discharge performance of the battery, and the foundation can be laid for improving the testing accuracy of the self-discharge performance of the battery by setting the second time period to be greater than the first preset time period.
Step S150, measuring a second open-circuit voltage corresponding to the battery after the second standing processing, and marking the corresponding time as a second preset time.
During the second standing treatment in the second preset time period, the voltage drop of the battery with qualified self-discharge performance in the first preset time period is basically reduced, and at the moment, during the second standing treatment in the second preset time period, the voltage drop of the battery with qualified self-discharge performance in the second preset time period is smaller than that of the abnormal battery.
Step S160, evaluating the self-discharge performance of the battery after the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage.
After the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage are obtained, the self-discharge performance of the battery after the second standing treatment can be evaluated according to the voltage drop reduction speed of each battery in the second standing treatment process in the second preset time period.
According to the test method, the standing treatment in the two time periods is adopted, wherein the standing treatment in the first preset time period can take the characteristic that the voltage drop of each battery in the initial stage is relatively fast into consideration, the standing treatment in the second preset time period is adopted, the defect that the voltage drop of each battery is relatively fast when the standing treatment in the first preset time period is singly depended on so as to be not beneficial to subsequent discharge performance judgment to screen abnormal batteries can be overcome, at the moment, the voltage of the abnormal battery is reduced faster than that of the normal battery in the second preset time period due to the fact that the length of the second preset time period is larger than that of the first preset time period, a foundation can be laid for the subsequent battery self-discharge performance judgment to screen the abnormal battery, the accuracy of self-discharge test is generally improved, the charging and discharging processes are simplified, energy consumption is saved, the abnormal battery is screened out by rapidly judging the self-discharge performance of each battery, and the storage time and the inventory pressure of the battery are further saved.
In one embodiment, the charging is constant current charging, and the current of the constant current charging is 0.1C-0.8C.
The current of the constant current charging is too large, although the charging time is short, the battery polarization has a large influence on the self-discharge test performance of the battery; if the current of the constant current charging is too small, the influence of the polarization of the battery is small, but the charging time is too long, and C is the nominal rated capacity of the battery.
By selecting proper constant current charging current of 0.1C-0.8C, the influence of the polarization process of the battery on the voltage drop of the battery at different moments is reduced, and the charging time is also considered.
In one embodiment, as shown in fig. 2, the abscissa is the charging rate, the ordinate is the open-circuit voltage after standing treatment, and in the case of three batteries, cell-1, cell-,2 and Cell-3, as the charging rate of the constant-current charging current increases, the open-circuit voltage after standing treatment after charging of each battery is substantially the same, and the charging time is gradually shortened, so that the constant-current charging current can be further set to 0.1C-0.5C in order to reduce the influence of the charging process on the self-discharge performance test of each battery, and comprehensively consider the charging time period.
In one embodiment, the constant current charging current can be selected to be 0.5C, and the influence of the charging process on the self-discharge performance test of each battery is further reduced while the charging time is considered, namely the influence of the battery polarization process on the voltage drop of the battery at different moments is reduced.
In one embodiment, the first predetermined period of time is between 0.5 and 5 days.
The first preset time period is not suitable to be too long, otherwise, the change of the voltage drop of the rechargeable battery is difficult to be utilized to judge whether the self-discharge performance of each battery is qualified, and the process of screening abnormal batteries in the follow-up process is not facilitated.
In one embodiment, the second predetermined period of time is 1 to 5 days.
The second preset time period is longer than the first preset time period, and the voltage of the abnormal battery is reduced faster than that of the normal battery in the second preset time period because the length of the second preset time period is longer than that of the first preset time period.
In one embodiment, the sum of the first preset period of time and the second preset period of time is less than or equal to 5 days.
As shown in fig. 3, fig. 3 is a schematic diagram of voltage drop of three groups of batteries (a, b, and c) changing with time, obviously, a cell with a faster voltage drop in an early stage in fig. 3, a cell with a faster voltage drop in a later stage, a cell with a slower voltage drop in the early stage, and a cell with a slower voltage drop in the later stage in fig. 3, when the standing time of the cell is longer in a trend, an error of a self-discharge test will be reduced, but the inventory pressure of the cell in the later stage will become larger, which is not beneficial to mass production, and when the time of the standing treatment (i.e., the sum of the first preset time period and the second preset time period) is equal to 5 days, the voltage drop change of a normal battery tends to be stable (i.e., the voltage drop is close to zero), so that in order to improve the overall efficiency, the sum of the first preset time period and the second preset time period may be further limited, i.e., not more than 5 days.
Wherein, the unit d represents one day, the voltage drop of the ordinate in fig. 3 is calculated as the voltage change value of two adjacent days, the curve a represents the voltage drop change of the abnormal battery, the curves b and c represent the voltage drop change of the normal battery pack, respectively, and when the sum of the first preset time period and the second preset time period is equal to 5 days, the voltage drop of the abnormal battery is still large.
In one embodiment, as shown in fig. 4, step S160 includes:
step S162, calculating the self-discharge rate of the battery after the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage, and the second open-circuit voltage.
And step S164, comparing the self-discharge rate with a preset self-discharge rate threshold value to evaluate the self-discharge performance of the battery after the second standing treatment.
In one embodiment, in the step of calculating the self-discharge rate of the battery after the second standing treatment in step S162, the following formula is used:
K＝(OCV 1 -OCV 2 )/(T 2 -T 1 )
wherein K is the self-discharge rate and OCV of the battery after the second standing treatment 1 Is the first open circuit voltage, OCV 2 Is a second open circuit voltage, T 1 For a first predetermined time, T 2 Is the second preset time.
In one embodiment, the predetermined state of charge is a state of charge of 1-5%.
The larger the preset charge state value is, the longer the charging time is, and the larger the influence of the battery voltage polarization process on the detection of the self-discharge performance of the battery is; the smaller the preset state of charge value, the shorter the charging time, but the too low state of charge, although less of a battery polarization effect, may result in the battery approaching empty power, which in turn may be detrimental to battery performance storage.
In one embodiment, the battery capacity is 140Ah, the self-discharge detection of the battery is performed by the method from step S110 to step S160, the preset temperature is 25 ℃, as shown in fig. 5, fig. 5 is a charging curve of the battery, the abscissa is Cap, the capacity of the battery is represented by Ah, and the ordinate is the battery voltage V 0 Further drawing a DV/DQ curve (differential capacity curve) of the battery according to fig. 5, as shown in fig. 6, the abscissa is SOC (preset state of charge of the battery), and the ordinate is a value of DV/DQ, in order to facilitate the continuous analysis, further performing an amplification study on the curve change condition of the SOC from 0 to 7% in fig. 5, as shown in fig. 7, it is obvious that if the preset state of charge SOC value is too small, for example, 1% SOC is selected, the battery is close to empty electricity, and the battery performance is further disadvantageously stored, and if the preset state of charge SOC value is too large, for example, 7% SOC is selected, the charging time is too long, the battery voltage polarization process has a larger influence on the detection of the self-discharge performance of the battery, and 3% SOC is selected in combination with the actual situation, that the battery voltage is charged to 3.062V at this time, the voltage change amplitude of the battery is smaller, on one hand, the influence of the battery voltage polarization process on the detection of the self-discharge performance of the battery can be reduced, on the other hand, the charging time and the influence on the detection of the self-discharge performance of the battery can be improved.
In one embodiment, the predetermined state of charge is 3% of chargeThe electrical state, preset temperature 25 deg.C, is tested using, for example, 16 cells, and the self-discharge test is performed on each cell according to the above steps S110 to S160 to calculate the self-discharge rate of each cell, and the horizontal first row of Table 1 represents the first preset time period T 1 And a second preset time period T 2 (i.e. T) 1 And T 2 ) The first vertical column of table 1 indicates the self-discharge rate value (i.e. K value) of each cell, ave the mean value of the K values, in mV, it is evident that, in combination with the stability of the fluctuations of the standard deviation σ and the stability of the mean value Ave of the K values, the negative value of Ave-2.5 σ is first rounded off; secondly, searching for the case of the minimum standard deviation σ, and further selecting the case that the mean Ave of the K values is small when σ =0.038, wherein the first preset time period T is the time period T 1 For 2 days, the second preset time period T 2 For 3 days, the average value of K values of the respective cells was 0.427.
The setting of the first preset time period and the second time period (the first preset time period T1 is 2 days, and the second preset time period T2 is 3 days) can fully ensure the self-discharge pressure drop release of each battery so as to screen the batteries with abnormal self-discharge, thereby improving the accuracy of the whole self-discharge test and greatly reducing the bin pressure of the whole battery during the self-discharge test.
Table 1
That is, the above description is only an embodiment of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, such as mutual combination of technical features between various embodiments, or direct or indirect application to other related technical fields, are included in the scope of the present application.
In addition, structural elements having the same or similar characteristics may be identified by the same or different reference numerals. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "for example" is used to mean "serving as an example, instance, or illustration". Any embodiment described herein as "for example" is not necessarily to be construed as preferred or advantageous over other embodiments. The previous description is provided to enable any person skilled in the art to make and use the present application. In the foregoing description, various details have been set forth for the purpose of explanation.
It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Claims (10)
1. A method for testing self-discharge of a battery, comprising:
charging the battery after capacity grading until the battery capacity corresponding to the battery after capacity grading reaches a preset charge state;
carrying out first standing treatment on the charged battery at a preset temperature for a first preset time period;
measuring a first open-circuit voltage corresponding to the battery after the first standing treatment, and marking the corresponding time as first preset time;
carrying out second standing treatment on the battery subjected to the first standing treatment at a preset temperature for a second preset time period, wherein the length of the second preset time period is greater than that of the first preset time period;
measuring a second open-circuit voltage corresponding to the battery subjected to the second standing treatment, and marking the corresponding time as second preset time;
and evaluating the self-discharge performance of the battery subjected to the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage.
2. The test method according to claim 1, wherein the charging is constant current charging, and the current of the constant current charging is 0.1C-0.8C.
3. The test method according to claim 1, wherein the first predetermined period of time is 0.5 to 5 days.
4. The test method according to claim 3, wherein the second predetermined period of time is 1 to 5 days.
5. The test method according to claim 4, characterized in that the sum of said first preset period of time and said second preset period of time is less than or equal to 5 days.
6. The test method according to claim 5, wherein the first predetermined period of time is 2 days and the second predetermined period of time is 3 days.
7. The test method of claim 1, wherein the predetermined state of charge is 1-5% state of charge.
8. The test method of claim 7, wherein the predetermined state of charge is a 3% state of charge.
9. The method according to claim 1, wherein the step of evaluating the self-discharge performance of the second still-treated battery according to the first preset time, the second preset time, the first open-circuit voltage, and the second open-circuit voltage comprises:
calculating the self-discharge rate of the battery subjected to the second standing treatment according to the first preset time, the second preset time, the first open-circuit voltage and the second open-circuit voltage;
and comparing the self-discharge rate with a preset self-discharge rate threshold value so as to evaluate the self-discharge performance of the battery subjected to the second standing treatment.
10. The test method according to claim 9, wherein in the step of calculating the self-discharge rate of the battery after the second standing treatment, the following formula is adopted:
K＝(OCV 1 -OCV 2 )/(T 2 -T 1 )
wherein K is the self-discharge rate and OCV of the battery after the second standing treatment 1 Is the first open circuit voltage, OCV 2 Is the second open circuit voltage, T 1 For the first predetermined time, T 2 The second preset time is set.
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| CN202210890203.7A CN115343639A (en) | 2022-07-26 | 2022-07-26 | Method for testing self-discharge of battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116626518A (en) * | 2023-07-24 | 2023-08-22 | 江苏正力新能电池技术有限公司 | Battery self-discharge detection method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116626518A (en) * | 2023-07-24 | 2023-08-22 | 江苏正力新能电池技术有限公司 | Battery self-discharge detection method and system |
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