Battery foreign body damage consistency test methods, devices, equipment, media and products

Abstract

The present application discloses a battery foreign body damage consistency test method, device, equipment, medium and product, which relates to the field of battery performance test technology. The method includes obtaining damaged battery samples and undamaged battery samples; the damaged battery samples are obtained after adding foreign matter during the battery dressing process; the undamaged battery samples are control samples of the damaged battery samples and do not contain foreign matter; the voltage drop values ​​of the damaged battery samples and the undamaged battery samples are tested respectively by a voltage drop test method, and the damage percentages of the damaged battery samples and the undamaged battery samples are obtained according to the voltage drop values ​​of the damaged battery samples and the undamaged battery samples; when the damage percentage is less than or equal to a preset threshold, the foreign body damage consistency result of the damaged battery sample is determined according to the voltage drop values ​​of the damaged battery samples and the undamaged battery samples. The present application can perform consistency testing on foreign body damage caused to the battery during the manufacturing process.

Description

Technical Field

[0001] The present application relates to the technical field of battery performance testing, and in particular to a battery foreign matter damage consistency testing method, device, equipment, medium and product. Background Art

[0002] As an energy storage device widely used in modern life such as automobiles, mobile phones, and electronic products, batteries have potential safety hazards during use, such as mechanical damage, damage caused by rapid charging, and damage during the manufacturing process, which may lead to battery performance degradation or even explosion and fire. Therefore, in order to ensure the safety of batteries during use, it is necessary to conduct foreign body damage consistency testing on batteries.

[0003] However, due to the lack of consistency in experimental results of the current foreign body damage test caused by the battery manufacturing process, especially the foreign body damage test caused by the battery dressing process, it is urgent to provide a technical solution that can perform consistency testing on foreign body damage to batteries. Summary of the invention

[0004] The purpose of this application is to provide a battery foreign body damage consistency test method, device, equipment, medium and product, which can perform consistency testing on foreign body damage caused to the battery during the manufacturing process.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a battery foreign body damage consistency test method, the battery foreign body damage consistency test method comprising:

[0007] Obtain damaged battery samples and undamaged battery samples; the damaged battery samples are obtained after adding foreign matter during the battery dressing process; the undamaged battery samples are control samples of the damaged battery samples and do not contain the foreign matter; under preset test conditions, respectively test the voltage drop values ​​of the damaged battery samples and the undamaged battery samples using a voltage drop test method, and obtain the damage percentages of the damaged battery samples and the undamaged battery samples based on the voltage drop values ​​of the damaged battery samples and the undamaged battery samples; when the damage percentage is less than or equal to a preset threshold, determine the consistency result of foreign matter damage to the damaged battery samples based on the voltage drop values ​​of the damaged battery samples and the undamaged battery samples.

[0008] Optionally, the damaged battery sample includes multiple damaged battery cells; the damage percentage of the damaged battery sample and the undamaged battery sample is obtained based on the voltage drop values ​​of the damaged battery sample and the undamaged battery sample, including: after the damaged battery sample and the undamaged battery sample are put aside for a preset time period, each of the damaged battery cells and the undamaged battery sample is tested by a voltage drop test method to obtain a baseline voltage drop value of the undamaged battery sample and a voltage drop value of each damaged battery cell; based on the baseline voltage drop value of the undamaged battery sample and the voltage drop value of each damaged battery cell, a damage difference value of each damaged battery cell is obtained; based on the damage difference value of each damaged battery cell, the damage percentage of each damaged battery cell and the undamaged battery sample is determined.

[0009] Optionally, determining the consistency result of foreign object damage of the damaged battery sample based on the voltage drop values ​​of the damaged battery sample and the undamaged battery sample includes: determining the maximum value among the damage percentages of each of the damaged battery cells and the undamaged battery sample as a target damage deviation percentage; and determining the consistency result of foreign object damage of the damaged battery sample based on the target damage deviation percentage.

[0010] Optionally, the method also includes: verifying the battery foreign object damage consistency result; if the battery foreign object damage consistency result is greater than or equal to a preset percentage, generating a battery foreign object damage consistency report, and sending the battery foreign object damage consistency report to a target terminal; if the battery foreign object damage consistency result is less than a preset percentage, sending a test failure message to the target terminal so that the user can retest the battery foreign object damage consistency.

[0011] Optionally, the foreign matter in the damaged battery sample is located on the anode sheet and / or cathode sheet of the damaged battery sample.

[0012] Optionally, the foreign matter that damages the battery sample is stainless steel particles with a diameter of 200-330 microns.

[0013] In a second aspect, the present application provides a battery foreign body damage consistency test device, the battery foreign body damage consistency test device comprising:

[0014] An acquisition module, used for acquiring damaged battery samples and undamaged battery samples; the damaged battery samples are obtained after adding foreign matter during the battery dressing process; the undamaged battery samples are control samples of the damaged battery samples and do not contain the foreign matter;

[0015] A first determination module is used to respectively test the voltage drop values ​​of the damaged battery sample and the undamaged battery sample by a voltage drop test method under preset test conditions, and obtain the damage percentages of the damaged battery sample and the undamaged battery sample according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample;

[0016] The second determination module is used to determine the consistency result of foreign body damage of the damaged battery sample according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample when the damage percentage is less than or equal to a preset threshold.

[0017] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any one of the above-mentioned battery foreign object damage consistency test methods.

[0018] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned battery foreign object damage consistency testing methods.

[0019] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any of the above-mentioned battery foreign object damage consistency testing methods.

[0020] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0021] The present application provides a battery foreign body damage consistency test method, device, equipment, medium and product. On the one hand, by calculating the damage percentage, it can be used to evaluate the performance difference between a damaged battery sample with foreign objects placed in it and an undamaged battery sample without foreign objects placed in it. The smaller the performance difference, the higher the consistency of the damage degree of the damaged battery sample, which provides good data support for the subsequent determination of the consistency results of the foreign body damage of the damaged battery sample; on the other hand, when the damage percentage is less than or equal to a preset threshold, the voltage drop values ​​of the damaged battery sample and the undamaged battery sample are determined by a voltage drop test, so that the consistency results of the foreign body damage of the damaged battery sample can be accurately determined, which provides good data support for the subsequent design and development of batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A flowchart of a battery foreign body damage consistency test method provided in one embodiment of the present application;

[0024] Figure 2 A schematic diagram of electrode layer distribution of a damaged battery sample provided in one embodiment of the present application;

[0025] Figure 3 A schematic diagram of functional modules of a battery foreign body damage consistency test device provided in one embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] In an exemplary embodiment, Figure 1 As shown, a battery foreign body damage consistency test method is provided, which is executed by a computer device, specifically, it can be executed by a computer device such as a terminal or a server alone, or it can be executed by a terminal and a server together. In the embodiment of the present application, the battery foreign body damage consistency test includes the following steps S110 to S130. Among them:

[0030] Step S110, obtaining damaged battery samples and undamaged battery samples.

[0031] In an exemplary embodiment, the damaged battery sample is obtained after adding foreign matter during the battery dressing process; the damaged battery sample may be a lithium-ion battery, which includes a plurality of lithium-ion battery cells, and may also include a lithium-ion battery module. The number of lithium-ion battery cells may be customized according to actual test requirements, for example, it may be set to 5, 8, or 10.

[0032] The undamaged battery sample may be a lithium-ion battery, which includes a plurality of lithium-ion battery cells, and may also include a lithium-ion battery module. The number of cells in the undamaged battery sample may be the same as that in the damaged battery sample, or may be less than that in the damaged battery sample, and the undamaged battery sample exists as a control group, so the undamaged battery sample does not contain foreign matter.

[0033] It should be noted that, for example, Figure 2 As shown, the anode sheets and cathode sheets of each lithium-ion battery cell of the damaged battery sample and the undamaged battery sample are staggered, wherein, when manufacturing the damaged battery sample, the tester or staff may add foreign matter to the anode sheet and / or cathode sheet of each lithium-ion battery cell during the battery dressing process to obtain multiple damaged battery cells. Specifically, the foreign matter involved in the embodiment of the present application is stainless steel particles with a diameter of 200-330 microns, for example, stainless steel particles with a diameter of 200 microns are selected and placed on the anode sheet or cathode sheet of a lithium-ion battery cell.

[0034] Step S120, using a voltage drop test method to test the voltage drop values ​​of the damaged battery sample and the undamaged battery sample respectively, and obtaining the damage percentages of the damaged battery sample and the undamaged battery sample according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample.

[0035] In the example embodiment, the damage percentage refers to the percentage change in the degree of damage between the damaged battery sample and the undamaged battery sample under normal temperature conditions. The damage percentage can be calculated to evaluate the performance difference between the battery sample with foreign matter placed and the undamaged battery sample without foreign matter placed, wherein the smaller the performance difference, the higher the consistency of the degree of damage of the damaged battery sample, providing good data support for the subsequent determination of the consistency results of foreign matter damage of the damaged battery sample.

[0036] Among them, in this embodiment, the voltage drop test method is used to test the voltage drop value of the damaged battery sample and the undamaged battery sample, which may include the following steps: 1. Activation: The damaged battery sample and the undamaged battery sample are initially charged and discharged according to the manufacturer's recommendations or standard procedures until the damaged battery sample and the undamaged battery sample are fully activated. 2. Characterization: After the activation is completed, the damaged battery sample and the undamaged battery sample are characterized, that is, the performance and characteristics of the damaged battery sample and the undamaged battery sample are recorded. In this embodiment, the initial voltage change of the damaged battery sample and the undamaged battery sample is mainly recorded. 3. Cycle test: Under the state of charge (SOC) of 5% to 95% of the damaged battery sample and the undamaged battery sample, the charge and discharge cycle is performed at a discharge rate of 1C until 200 cycles are completed. 4. After the cycle is completed, the damaged battery sample and the undamaged battery sample are shelved, for example, the damaged battery sample and the undamaged battery sample are placed in a specified environment (such as room temperature) for 7 days to avoid any external interference. 5. After the 7-day shelf life, record the shelf voltage of the damaged battery samples and the undamaged battery samples. Determine the voltage drop value of the damaged battery samples based on the initial voltage of the damaged battery samples and the shelf voltage after shelf life. Determine the voltage drop value of the undamaged battery samples based on the initial voltage of the undamaged battery samples and the shelf voltage after shelf life.

[0037] It should be noted that the above voltage drop test method can be a static discharge test method, a dynamic discharge test method, or a cycle test method. This embodiment does not impose any limitation on the method of performing voltage drop test on damaged battery samples.

[0038] Step S130, when the damage percentage is less than or equal to a preset threshold, determining the consistency result of foreign matter damage of the damaged battery sample according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample.

[0039] In the exemplary embodiment, the consistency result of foreign matter damage of the damaged battery sample refers to the consistency of the voltage drop between different damaged battery cells after the battery voltage drops of each damaged battery cell in the damaged battery sample. It is very important for evaluating the overall performance, reliability and safety of the damaged battery sample.

[0040] It can be understood that after obtaining the damage percentage of each monomer of the damaged battery sample, the maximum value is determined from the damage percentage of each monomer, and the maximum value is compared with the preset threshold; when the maximum value is greater than the preset threshold, the damage degree of the damaged battery sample is not consistent; when the minimum value is less than or equal to the preset threshold, the damage degree of the damaged battery sample is consistent; then, on the premise that the damage degree of the damaged battery sample is consistent, the consistency result of foreign body damage of the damaged battery sample is determined.

[0041] The battery foreign object damage consistency test method provided in the embodiment of the present application includes: obtaining a calculated damage percentage that can be used to evaluate the performance between a battery sample with foreign objects placed therein and an undamaged battery sample without foreign objects placed therein; using a voltage drop test method to test the voltage drop values ​​of the damaged battery sample and the undamaged battery sample respectively, and obtaining the damage percentages of the damaged battery sample and the undamaged battery sample based on the voltage drop values ​​of the damaged battery sample and the undamaged battery sample; when the damage percentage is less than or equal to a preset threshold, determining the foreign object damage consistency result of the damaged battery sample based on the voltage drop values ​​of the damaged battery sample and the undamaged battery sample.

[0042] Compared with the existing technology, on the one hand, this technical solution can be used to evaluate the performance between damaged battery samples with foreign objects placed in them and undamaged battery samples without foreign objects placed in them by calculating the damage percentage, thereby providing a guarantee for the consistency of the damage degree of the damaged battery samples, and further providing a guarantee for the accuracy of the consistency results of foreign object damage of the damaged battery samples; on the other hand, when the damage percentage is less than or equal to the preset threshold, the voltage drop values ​​of the damaged battery samples and the undamaged battery samples are determined by the voltage drop test method, so as to accurately determine the consistency results of foreign object damage of the damaged battery samples, providing good data support for the subsequent design and development of batteries.

[0043] In another exemplary embodiment of the present application, a specific implementation method for obtaining the damage percentage of the damaged battery sample and the undamaged battery sample according to the voltage drop value of the damaged battery sample and the undamaged battery sample is also provided, that is, the above step S120 can be replaced by the following steps S210 to S230:

[0044] Step S210, after the damaged battery samples and the undamaged battery samples are left for a preset period of time, each damaged battery cell and the undamaged battery sample are tested using a voltage drop test method to obtain a reference voltage drop value of the undamaged battery sample and a voltage drop value of each damaged battery cell.

[0045] Step S220 , obtaining the damage difference of each damaged battery cell based on the reference voltage drop value of the undamaged battery sample and the voltage drop value of each damaged battery cell.

[0046] Step S230 , determining the damage percentage of each damaged battery cell and the undamaged battery sample based on the damage difference of each damaged battery cell.

[0047] In combination with the above embodiments, as shown in Table 1 below:

[0048] Table 1

[0049]

[0050] It can be understood that three battery cells with the same size and properties are selected as damaged battery samples, namely SUS304-1, SUS304-2 and SUS304-3, and two battery cells with the same size and properties are selected as undamaged battery samples, namely Base numbered 1 and Base numbered 2. After obtaining damaged battery samples and undamaged battery samples, Base No. 1 and Base No. 2, SUS304-1, SUS304-2 and SUS304-3 were activated and characterized respectively, and then charge and discharge cycles were carried out at a discharge rate of 1C at a state of charge (SOC) of 5%~97% until 200 cycles were completed; finally, after being shelved for 7 days, the voltage drop value of Base No. 1 after the first shelving was measured to be 49.6mv; the voltage drop value of Base No. 2 after the first shelving was 49.3mv; the voltage drop values ​​of SUS304-1, SUS304-2, and SUS304-3 after the first shelving were 55.4mv, 55.5mv, and 55.5mv, respectively. According to the above data, the baseline voltage drop value of the undamaged battery sample is determined to be the average voltage drop value of Base No. 1 and Base No. 2, which is 49.45mv; the difference between the voltage drop values ​​of SUS304-1, SUS304-2, and SUS304-3 and the baseline voltage drop value of 49.45mv is calculated, and the damage difference of SUS304-1 is 5.95mv, the damage difference of SUS304-2 is 6.05mv, and the damage difference of SUS304-3 is 6.05mv; the difference between SUS The average of the damage differences of SUS304-1, SUS304-2, and SUS304-3 is 6.02mv; then, the difference between the damage differences of SUS304-1, SUS304-2, and SUS304-3 and the average of the damage differences is calculated, and the damage deviations of SUS304-1, SUS304-2, and SUS304-3 are 0.07mv, 0.03mv, and 0.03mv, respectively; finally, according to the formula damage percentage = (damage deviation / average of damage difference) | * 100%, the damage percentage of SUS304-1 is 1.18%, the damage percentage of SUS304-2 is 0.50%, and the damage percentage of SUS304-3 is 0.50%.

[0051] It should be noted that in battery testing, the damage percentage is usually used to measure the degree of performance degradation of battery samples with foreign objects placed in them and the effectiveness of the testing method. In this embodiment, the damage percentage is limited to be less than or equal to a preset threshold, which can ensure the consistency and stability of the damaged battery samples, and thus ensure the accuracy of the consistency results of foreign object damage of the damaged battery samples.

[0052] In addition, the preset threshold in the embodiment of the present application can be set to 5%. Combined with the above content, when the damage percentages of the damaged battery samples are all within 5%, the damaged battery samples provided in the embodiment of the present application have consistency in the degree of damage, and the measured data can provide effective data support for the subsequent consistency results of the damage results.

[0053] In another exemplary embodiment of the present application, specific implementation steps for determining the consistency result of foreign body damage of damaged battery samples according to the voltage drop values ​​of damaged battery samples and undamaged battery samples are also provided, that is, the above step S130 can be replaced by the following steps S310 to S320:

[0054] Step S310 , determining the maximum value among the damage percentages of the damaged battery cells and the undamaged battery samples as the target damage deviation percentage.

[0055] Step S320, determining the consistency result of foreign matter damage of the damaged battery sample according to the target damage deviation percentage.

[0056] In combination with the above embodiments, as shown in Table 2 below:

[0057] Table 2

[0058]

[0059] It can be understood that ten battery cells with the same size and properties were selected as test samples, namely 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, and 10#. Among them, stainless steel foreign particles were placed on the anode sheets of 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, and 10#, generating multiple damaged battery cells; two battery cells with the same size and properties were selected as comparison samples, namely D1# and D2#, and no stainless steel foreign particles were placed on the anode sheets of D1# and D2#.

[0060] After the production of the test samples and the comparison samples was completed, they were activated and characterized, and then charged and discharged at a discharge rate of 1C under a state of charge (SOC) of 5%-97%. After 200 cycles, they were placed aside for 7 days. After that, the voltage drop test method was used to test the voltage drop values ​​of 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, D1# and D2# after the first placement, and the voltage drop value of 1# was obtained. The voltage drop values ​​corresponding to -9# are all 55.2mV, the voltage drop value corresponding to 10# is 55.3mV, the voltage drop values ​​of D1# and D2# are all 49.4mV, and the average voltage drop value of D1# and D2# is 49.4mV. According to the voltage drop values ​​of 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, and the average voltage drop value of D1# and D2#, the damage difference of each damaged battery cell in the test sample is 6.1 mV, 6.1mV, 6.1mV, 6.1mV, 6.1mV, 6.1mV, 6.1mV, 6.1mV, 6.1mV, 6.1mV and 6.2mV. According to the damage difference of each damaged battery cell and the average of the damage difference, the damage percentage of each damaged battery cell of the test sample is 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 1.45% respectively; the maximum value among 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 0.16%, 1.45% is determined as the target damage deviation percentage, that is, the target damage deviation percentage is 1.45%, and then the consistency of the battery foreign body damage results of the damaged battery sample is S=1-Smax=1-1.45%=98.55%.

[0061] It should be noted that in the embodiment of the present application, a damaged battery sample is obtained by adding foreign matter to the anode and / or cathode of the battery during the battery dressing process; by determining that the damage percentage of the damaged battery sample is less than a preset threshold, it can be ensured that the degree of damage between each monomer of the damaged battery sample is consistent, providing good data support for the subsequent determination of the consistency result of foreign matter damage of the damaged battery sample; by obtaining a battery foreign matter damage consistency result of 98.55%, it can be reflected that the method of adding foreign matter to the battery and performing damage performance testing on the battery after adding foreign matter is feasible, and the data obtained from the test is credible, which can provide good data support for the subsequent design and development of batteries.

[0062] In another exemplary embodiment of the present application, in order to ensure the validity of the battery foreign object damage consistency result, the battery foreign object damage consistency result needs to be verified. After the above step S130, the method may further include: verifying the battery foreign object damage consistency result; if the battery foreign object damage consistency result is greater than or equal to a preset percentage, generating a battery foreign object damage consistency report, and sending the battery foreign object damage consistency report to the target terminal; if the battery foreign object damage consistency result is less than the preset percentage, sending a test failure message to the target terminal, so that the user can retest the battery foreign object damage consistency.

[0063] It should be noted that, in combination with the above embodiments, the embodiments of the present application need to compare the battery foreign matter damage consistency result S with the preset percentage of 90%. Since 98.55%>90%, the foreign matter damage consistency result of the damaged battery sample is valid.

[0064] Based on the same inventive concept, the embodiment of the present application also provides a battery foreign object damage consistency test device for implementing the battery foreign object damage consistency test method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery foreign object damage consistency test device embodiments provided below can refer to the limitations of the battery foreign object damage consistency test method above, and will not be repeated here.

[0065] In an exemplary embodiment, Figure 3 As shown, a battery foreign object damage consistency test device is provided, and the battery foreign object damage consistency test device 300 includes: an acquisition module 310, a first determination module 320 and a second determination module 330, wherein:

[0066] The acquisition module 310 is used to acquire damaged battery samples and undamaged battery samples; the damaged battery samples are obtained after adding foreign matter during the battery dressing process; the undamaged battery samples are control samples of the damaged battery samples that do not contain foreign matter;

[0067] The first determination module 320 is used to test the voltage drop values ​​of the damaged battery sample and the undamaged battery sample respectively by a voltage drop test method under preset test conditions, and obtain the damage percentages of the damaged battery sample and the undamaged battery sample according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample;

[0068] The second determination module 330 is used to determine the foreign matter damage consistency result of the damaged battery sample according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample when the damage percentage is less than or equal to a preset threshold.

[0069] As an optional implementation, the damaged battery sample includes a plurality of damaged battery cells; the first determination module 320 is further used to, after the damaged battery sample and the undamaged battery sample are shelved for a preset period of time, respectively test each damaged battery cell and the undamaged battery sample using a voltage drop test method to obtain a baseline voltage drop value of the undamaged battery sample and a voltage drop value of each damaged battery cell; obtain a damage difference of each damaged battery cell based on the baseline voltage drop value of the undamaged battery sample and the voltage drop value of each damaged battery cell; determine the damage percentage of each damaged battery cell and the undamaged battery sample based on the damage difference of each damaged battery cell.

[0070] As an optional implementation, the second determination module 330 is also used to determine the maximum value among the damage percentages of each damaged battery cell and the undamaged battery sample as the target damage deviation percentage; and determine the foreign body damage consistency result of the damaged battery sample based on the target damage deviation percentage.

[0071] As an optional implementation, the battery foreign object damage consistency testing device 300 is also used to verify the battery foreign object damage consistency result; if the battery foreign object damage consistency result is greater than or equal to a preset percentage, a battery foreign object damage consistency report is generated and the battery foreign object damage consistency report is sent to the target terminal; if the battery foreign object damage consistency result is less than the preset percentage, a test failure message is sent to the target terminal so that the user can retest the battery foreign object damage consistency.

[0072] As an optional implementation, the foreign matter in the damaged battery sample is located on the anode sheet and / or cathode sheet of the damaged battery sample.

[0073] As an optional implementation, the foreign matter that damages the battery sample is stainless steel particles with a diameter of 200-330 microns.

[0074] Among them, by implementing this implementation method, on the one hand, by calculating the damage percentage, it can be used to evaluate the performance difference between damaged battery samples with foreign objects placed in them and undamaged battery samples without foreign objects placed in them. The smaller the performance difference, the higher the consistency of the damage degree of the damaged battery samples, which provides good data support for the subsequent determination of the consistency results of foreign object damage of the damaged battery samples; on the other hand, when the damage percentage is less than or equal to the preset threshold, the voltage drop values ​​of the damaged battery samples and the undamaged battery samples are determined by the voltage drop test method, so that the consistency results of foreign object damage of the damaged battery samples can be accurately determined, which provides good data support for the subsequent design and development of batteries.

[0075] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store battery foreign body damage consistency test data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery foreign body damage consistency test method is implemented.

[0076] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0077] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0078] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0079] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0080] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0081] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0082] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0083] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A battery foreign body damage consistency test method, characterized in that: The battery foreign body damage consistency test method comprises: Obtaining damaged battery samples and undamaged battery samples; the damaged battery samples are obtained after adding foreign matter during the battery dressing process; the undamaged battery samples are control samples of the damaged battery samples and do not contain the foreign matter; The voltage drop test method is used to test the voltage drop values ​​of the damaged battery sample and the undamaged battery sample respectively, and the damage percentage of the damaged battery sample and the undamaged battery sample is obtained according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample; the damage percentage = (damage deviation / mean of damage difference) * 100%, wherein the damage difference is obtained by the voltage drop value of the damaged battery sample and the undamaged battery sample; the mean of the damage deviation and the damage difference is obtained by the damage difference; When the damage percentage is less than or equal to a preset threshold, the foreign body damage consistency result of the damaged battery sample is determined according to the voltage drop value of the damaged battery sample and the undamaged battery sample; the foreign body damage consistency result S=1-Smax; wherein Smax is the maximum value of all damage percentages.

2. The battery foreign matter damage consistency test method according to claim 1, characterized in that: The damaged battery sample includes a plurality of damaged battery cells; The obtaining, according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample, the damage percentages of the damaged battery sample and the undamaged battery sample comprises: After the damaged battery sample and the undamaged battery sample are left for a preset period of time, each of the damaged battery cells and the undamaged battery sample is tested by a voltage drop test method to obtain a reference voltage drop value of the undamaged battery sample and a voltage drop value of each of the damaged battery cells; Based on the reference voltage drop value of the undamaged battery sample and the voltage drop value of each damaged battery cell, obtaining the damage difference value of each damaged battery cell; Based on the damage difference of each of the damaged battery cells, the damage percentage of each of the damaged battery cells and the non-damaged battery sample is determined.

3. The battery foreign matter damage consistency test method according to claim 2, characterized in that: The determining, according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample, a foreign matter damage consistency result of the damaged battery sample comprises: Determine the maximum value among the damage percentages of the damaged battery cells and the undamaged battery samples as the target damage deviation percentage; According to the target damage deviation percentage, the foreign body damage consistency result of the damaged battery sample is determined.

4. The battery foreign matter damage consistency test method according to any one of claims 1 to 3, characterized in that: The method further comprises: Verifying the consistency results of the battery foreign body damage; If the battery foreign object damage consistency result is greater than or equal to a preset percentage, a battery foreign object damage consistency report is generated and sent to the target terminal; If the battery foreign object damage consistency result is less than a preset percentage, a test failure message is sent to the target terminal so that the user can retest the battery foreign object damage consistency.

5. The battery foreign matter damage consistency test method according to any one of claims 1 to 3, characterized in that: The foreign matter in the damaged battery sample is located on the anode sheet and / or cathode sheet of the damaged battery sample.

6. The battery foreign matter damage consistency test method according to any one of claims 1 to 3, characterized in that: The foreign matter in the damaged battery sample was stainless steel particles with a diameter of 200-330 microns.

7. A battery foreign body damage consistency test device, characterized in that: The battery foreign body damage consistency testing device comprises: An acquisition module, used for acquiring damaged battery samples and undamaged battery samples; the damaged battery samples are obtained after adding foreign matter during the battery dressing process; the undamaged battery samples are control samples of the damaged battery samples and do not contain the foreign matter; The first determination module is used to respectively test the voltage drop values ​​of the damaged battery sample and the undamaged battery sample by a voltage drop test under preset test conditions, and obtain the damage percentage of the damaged battery sample and the undamaged battery sample according to the voltage drop values ​​of the damaged battery sample and the undamaged battery sample; the damage percentage = (damage deviation / mean of damage difference) * 100%, wherein the damage difference is obtained by the voltage drop values ​​of the damaged battery sample and the undamaged battery sample; the mean of the damage deviation and the damage difference is obtained by the damage difference; The second determination module is used to determine the foreign body damage consistency result of the damaged battery sample according to the voltage drop value of the damaged battery sample and the undamaged battery sample when the damage percentage is less than or equal to a preset threshold; the foreign body damage consistency result S=1-Smax; wherein Smax is the maximum value of all damage percentages.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the battery foreign matter damage consistency test method described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery foreign matter damage consistency testing method described in any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the battery foreign matter damage consistency testing method described in any one of claims 1 to 6 are implemented.

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