A battery gradient utilization method, apparatus, device, and medium

Abstract

The application relates to the technical field of electric vehicle batteries, in particular to a battery gradient utilization method, device, equipment and medium, which comprises the following steps: for each battery module, judging whether the battery module is deformed based on multi-directional images; if the battery module is deformed, determining abnormal battery cells and normal battery cells, and if the battery module is not deformed, determining all the battery cells as normal battery cells; determining the battery capacity corresponding to all the normal battery cells based on all the charging and discharging conditions, and determining the capacity gradient corresponding to all the normal battery cells by using a capacity gradient table; for each capacity gradient, recombining a plurality of normal battery cells corresponding to the capacity gradient from all the normal battery cells to obtain all the matched battery modules. In this way, the battery capacity difference between the plurality of normal battery cells in the matched battery module is small, and the use performance of the matched battery module is improved.

Description

Technical Field

[0001] This application relates to the technical field of electric vehicle batteries, and in particular to a method, apparatus, device, and medium for the gradient utilization of batteries. Background Technology

[0002] In recent years, with the increasing severity of environmental problems and the growing prominence of human living environment issues, how to better protect the environment has become a common research direction for countries around the world. New energy sources have become the main force in environmental protection projects, and new energy vehicles have emerged accordingly. However, when the battery capacity of new energy vehicles decays to less than 80% of its initial capacity, the driving range of new energy vehicles will be significantly reduced and will not meet the requirements for vehicle use. But for energy storage systems, such as communication base stations, solar street lights, and backup power supplies, these batteries still have significant value. Therefore, tiered utilization of batteries can fully realize their value.

[0003] However, due to the complex operating conditions that batteries undergo when used in electric vehicles, the degree of aging varies greatly between different battery packs and even between different cells within the same battery pack. When repackaging batteries, cells with different degrees of aging can create a bottleneck effect in the gradient utilization battery pack, thereby affecting the performance of the battery module.

[0004] Therefore, how to improve battery pack performance is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a battery gradient utilization method, apparatus, device, and medium to solve at least one of the above-mentioned technical problems.

[0006] The above-mentioned inventive objective of this application is achieved through the following technical solutions:

[0007] Firstly, this application provides a battery gradient utilization method, which adopts the following technical solution:

[0008] A battery gradient utilization method, the method comprising:

[0009] For each battery module, multi-angle images of the battery module are acquired, and it is determined whether the battery module is deformed based on the multi-angle images. The battery module is composed of multiple battery cells.

[0010] If the battery module is deformed, abnormal cells and normal cells are identified in the battery module. If the battery module is not deformed, all cells corresponding to the battery module are identified as normal cells. Abnormal cells are cells that have been deformed, and normal cells are cells that have not been deformed.

[0011] The charging and discharging status of multiple normal cells in each battery module is obtained. Based on all charging and discharging statuses, the battery capacity corresponding to each normal cell is determined, and the capacity tier corresponding to each normal cell is determined using the capacity tier relationship table.

[0012] For each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules. The total number of battery modules is the sum of multiple battery models corresponding to each capacity tier.

[0013] By adopting the above technical solution, for each battery module, multi-angle images are used to determine whether the battery module is deformed. If the battery module is deformed, abnormal cells and normal cells are identified from the battery module. If the battery module is not deformed, all cells are identified as normal cells. Then, based on the charging and discharging status of multiple normal cells in each battery module, the battery capacity and capacity tier corresponding to each normal cell are determined. Furthermore, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all paired battery modules. In this way, the battery capacity difference between multiple normal cells in the paired battery module is minimized, avoiding the bottleneck effect of the paired battery module when using batteries in a gradient manner, and improving the performance of the paired battery module.

[0014] In a preferred embodiment, this application can be further configured as follows: for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules, including:

[0015] For each capacity tier, the battery capacity of each normal cell corresponding to the capacity tier is numbered from smallest to largest. Multiple normal cells with the same battery capacity are recorded as having the same number.

[0016] For each capacity tier, all normal cells are recombined based on their respective numbers to obtain all battery modules.

[0017] By adopting the above technical solution, for each capacity tier, the battery capacity of each normal cell corresponding to the capacity tier is numbered from smallest to largest, and then recombined based on the numbering to obtain all battery modules. In this way, the battery capacity of all normal cells constituting the battery module is the same or similar, so that the battery module will not have a bottleneck effect and the battery module performance is high.

[0018] In a preferred embodiment, this application can be further configured such that: if the battery module deforms, identifying abnormal and normal cells within the battery module includes:

[0019] If the battery module deforms, then obtain multiple first distances between each adjacent cell in the battery module and multiple second distances between each cell and the battery module casing;

[0020] Each of the first distances is compared with the first threshold to obtain the first result corresponding to each battery cell.

[0021] Each of the second distances is compared with the second threshold to obtain the second result corresponding to each cell.

[0022] Based on the first result and the second result corresponding to each cell, the abnormal cells and normal cells in the battery module are determined comprehensively.

[0023] By adopting the above technical solution, if the battery module is deformed, multiple first distances between each adjacent cell in the battery module and multiple second distances between each cell and the battery module casing are obtained. Each first distance is compared with a first threshold to determine the first result corresponding to each cell. Then, each second distance is compared with a second threshold to obtain the second result corresponding to each cell. The abnormal cells and normal cells in the battery module are determined by combining the first and second results, which makes the determination of abnormal cells and normal cells more accurate.

[0024] In a preferred embodiment, this application can be further configured such that, after determining the capacity tier corresponding to each of all normal cells using the capacity tier relationship table, it also includes:

[0025] For each battery module, if the battery module is deformed, the battery module is marked as a disassembled battery module.

[0026] For each battery module, if the battery module is not deformed, it is determined whether the capacity tiers corresponding to all normal cells are the same. If so, the battery module is marked as the first matched battery module; otherwise, the battery module is marked as a disassembled battery module.

[0027] Accordingly, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules, including:

[0028] For each capacity tier, all normal cells corresponding to all disassembled battery modules are recombined based on the capacity tier to obtain all second-group battery modules.

[0029] The first and second battery modules are identified as all battery modules.

[0030] By adopting the above technical solution, if the battery module is not deformed and all normal cells within the module have the same capacity tier, the battery module is marked as the first-stage battery module, and the cells within the module are no longer disassembled, saving manpower and resources to some extent. If the battery module is deformed, i.e., there are abnormal cells within the module, or all normal cells within the module have different capacity tiers, the battery module is marked as a disassembled battery module. Accordingly, for each capacity tier, all normal cells corresponding to all disassembled battery modules are recombined based on their capacity tiers to obtain all second-stage battery modules. In this way, all normal cells in the assembled battery modules have the same capacity tier, ensuring the performance of the assembled battery modules, while also saving manpower and resources to some extent.

[0031] In a preferred embodiment, this application may be further configured such that, after determining the first and second battery modules as all battery modules, the method further includes:

[0032] For each battery module group, the first charge and discharge status of each normal cell in the battery module group is obtained at a first temperature, wherein the first charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time.

[0033] For each battery module group, the second charge and discharge status of each normal cell in the battery module group is obtained at a second temperature. The second charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time. The first temperature is lower than the second temperature.

[0034] For each battery module, based on the first charge / discharge status and the second charge / discharge status corresponding to each normal cell in the battery module, it is determined whether there are mismatched cells in the battery module.

[0035] If there are mismatched cells, the mismatched cells will be marked in the battery module to facilitate their replacement.

[0036] By adopting the above technical solution, for each battery module, the first charge / discharge status and the second charge status of each normal cell in the battery module are obtained at a first temperature and a second temperature, respectively. Based on the first charge / discharge status and the second charge status, mismatched cells in the battery module are determined. This approach considers the impact of different temperatures on the cell charge / discharge status and identifies mismatched cells based on these statuses, facilitating timely replacement of mismatched cells. Therefore, it ensures that the final battery module maintains high performance under different temperatures.

[0037] In a preferred embodiment, this application may be further configured such that, after obtaining all the matched battery modules, it also includes:

[0038] For each capacity tier, multiple battery modules are selected from all battery modules and connected to obtain multiple graded battery packs corresponding to each capacity tier.

[0039] Based on the relationship between capacity tiers and applications, the corresponding application areas for each grade of battery pack are determined.

[0040] For each gradient battery pack, an application domain test plan is determined based on the application domain corresponding to the gradient battery pack, and the test results of the gradient battery pack under the application domain test plan are obtained. The test results are used to determine whether the gradient battery pack meets the working requirements of the application domain.

[0041] By adopting the above technical solution, for each capacity tier, multiple battery modules corresponding to the same capacity tier are selected and connected to obtain multiple graded battery packs for each capacity tier. The application fields corresponding to each graded battery pack are determined. For each graded battery pack, an application field test plan is determined based on the application field, and the test results of the graded battery pack under the application field test plan are obtained to determine whether the graded battery pack meets the working requirements of the application field. In this way, all graded battery packs can be used in their applicable fields, and the test results corresponding to the application field test plan can determine whether the graded battery pack meets the working requirements of the application field, thus ensuring the stability of the graded battery packs when operating in the application field to a certain extent.

[0042] In a preferred embodiment, this application can be further configured such that: determining the capacity tier corresponding to each of all normal cells using a capacity tier relationship table includes:

[0043] For each normal battery cell, determine whether the battery capacity corresponding to the normal battery cell is less than the minimum battery capacity value. If it is less, mark the normal battery cell as an abnormal battery cell.

[0044] If it is not less than, then the capacity tier corresponding to each of the normal cells is determined using the capacity tier relationship table.

[0045] By adopting the above technical solution, if the battery capacity corresponding to a normal cell is less than the minimum battery capacity value, the normal cell is marked as an abnormal cell. If it is not less than the minimum capacity value, the capacity tier corresponding to each normal cell is determined using a capacity tier table. In this way, cells with lower battery capacities can be screened, marked as abnormal cells, and dismantled and recycled, thus ensuring the safety of tiered utilization of cells to a certain extent.

[0046] Secondly, this application provides a battery gradient utilization device, which adopts the following technical solution:

[0047] A battery gradient utilization device, comprising:

[0048] The module deformation judgment module is used to acquire multi-angle images of each battery module and determine whether the battery module is deformed based on the multi-angle images. The battery module is composed of multiple battery cells.

[0049] A normal cell determination module is used to determine abnormal cells and normal cells in the battery module if the battery module is deformed, and to determine all cells corresponding to the battery module as normal cells if the battery module is not deformed. The abnormal cells are cells that have been deformed, and the normal cells are cells that have not been deformed.

[0050] The capacity tier determination module is used to obtain the charging and discharging status of multiple normal cells in each battery module, determine the battery capacity corresponding to each normal cell based on all charging and discharging status, and determine the capacity tier corresponding to each normal cell using the capacity tier relationship table.

[0051] The cell recombination module is used to recombine multiple normal cells corresponding to each capacity tier from all normal cells to obtain all battery modules. The total number of battery modules is the sum of multiple battery models corresponding to each capacity tier.

[0052] By adopting the above technical solution, for each battery module, multi-angle images are used to determine whether the battery module is deformed. If the battery module is deformed, abnormal cells and normal cells are identified from the battery module. If the battery module is not deformed, all cells are identified as normal cells. Then, based on the charging and discharging status of multiple normal cells in each battery module, the battery capacity and capacity tier corresponding to each normal cell are determined. Furthermore, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all paired battery modules. In this way, the battery capacity difference between multiple normal cells in the paired battery module is minimized, avoiding the bottleneck effect of the paired battery module when using batteries in a gradient manner, and improving the performance of the paired battery module.

[0053] Thirdly, this application provides an electronic device that adopts the following technical solution:

[0054] At least one processor;

[0055] Memory;

[0056] At least one application, wherein the at least one application is stored in memory and configured to be executed by at least one processor, the at least one application being configured to: perform the method described above.

[0057] Fourthly, this application provides a computer-readable storage medium, which adopts the following technical solution:

[0058] A computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to perform the method described above.

[0059] In summary, this application includes at least one of the following beneficial technical effects:

[0060] 1. For each battery module, multi-angle images are used to determine if the module is deformed. If deformed, abnormal and normal cells are identified. If not deformed, all cells are identified as normal. Then, based on the charging and discharging status of the normal cells in each module, the battery capacity and capacity tier for each normal cell are determined. For each capacity tier, the normal cells corresponding to that tier are recombined to obtain all paired battery modules. This method minimizes the difference in battery capacity between the normal cells in a paired battery module, avoiding a bottleneck effect during battery gradient utilization and improving the overall performance of the paired battery modules.

[0061] 2. If the battery module is not deformed, and all normal cells within the module have the same capacity tier, the battery module is marked as the first-stage battery module, and the cells within it are no longer disassembled, saving manpower and resources to some extent. If the battery module is deformed, i.e., there are abnormal cells within it, or all normal cells within it have different capacity tiers, the battery module is marked as a disassembled battery module. Accordingly, for each capacity gradient, all normal cells corresponding to all disassembled battery modules are recombined based on their capacity tiers to obtain all second-stage battery modules. In this way, all normal cells in the assembled battery modules have the same capacity tier, ensuring the performance of the assembled battery modules, while also saving manpower and resources to some extent. Attached Figure Description

[0062] Figure 1 This is a schematic flowchart of a battery gradient utilization method according to one embodiment of this application.

[0063] Figure 2 This is a schematic diagram of the structure of a battery gradient utilization device according to one embodiment of this application.

[0064] Figure 3 This is a schematic diagram of the structure of an electronic device according to one embodiment of this application. Detailed Implementation

[0065] The following combination Figures 1 to 3 This application will be described in further detail.

[0066] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of this application.

[0067] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0068] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0069] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0070] When the battery capacity of a new energy vehicle decays to less than 80% of its initial capacity, the driving range of the new energy vehicle will be significantly reduced, and the battery capacity decayed to less than 80% of its initial capacity can no longer meet the requirements for vehicle use. However, for energy storage systems, such as communication base stations, solar street lights, and backup power supplies, these batteries still have great value. Therefore, tiered utilization of batteries can give full play to their value.

[0071] However, due to the complex operating conditions that batteries undergo when used in new energy vehicles, the degree of aging varies greatly between different battery modules and even between different batteries within the same module. Therefore, when repackaging batteries, batteries with different degrees of aging can create a bottleneck effect in the tiered battery module, thus affecting the overall performance of the battery module.

[0072] This application provides a battery gradient utilization method executed by an electronic device, which can be a server or a terminal device. The server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. The terminal device can be a smartphone, tablet, laptop, desktop computer, etc., but is not limited to these. The terminal device and the server can be directly or indirectly connected via wired or wireless communication. This application does not impose any limitations on this. Figure 1 As shown, the method includes steps S101, S102, S103, and S104, wherein:

[0073] Step S101: For each battery module, acquire multi-angle images of the battery module, and determine whether the battery module is deformed based on the multi-angle images. The battery module is composed of multiple battery cells.

[0074] In the embodiments of this application, since the battery has undergone complex operating conditions when used in new energy vehicles, the degree of aging between different battery modules and between different batteries in the same battery module varies greatly. Of course, the battery cells may bulge and deform during use. However, if the bulging and deformed battery cells are used in a gradient manner, it is very easy to cause electrical hazards. Therefore, the bulging and deformed battery cells need to be disassembled and recycled.

[0075] Furthermore, the battery module is composed of multiple battery cells plus a battery module casing. Multi-view images of the battery module are acquired using a multi-image acquisition device. These multi-view images need to include every side of the battery module to ensure more accurate results in determining whether the battery module is deformed. Then, based on the acquired multi-view images, the actual outline of the battery module is drawn, and the actual outline is compared with a standard outline to determine whether the battery module is deformed. The standard outline is the outline of the battery module without deformation.

[0076] Step S102: If the battery module is deformed, identify abnormal cells and normal cells in the battery module. If the battery module is not deformed, identify all cells corresponding to the battery module as normal cells. Abnormal cells are cells that have been deformed, and normal cells are cells that have not been deformed.

[0077] In this embodiment, if the battery module deforms, it indicates that there are bulging and deformed cells within the battery module. In this case, it is necessary to distinguish between normal and abnormal cells within the battery module. Abnormal cells are those that have deformed and need to be disassembled and recycled. Normal cells are those that have not deformed and can be further utilized. If the battery module is not deformed, it indicates that all cells within the battery module are not bulging or deformed, and all cells corresponding to the battery module are identified as normal cells.

[0078] Step S103: Obtain the charging and discharging status of multiple normal cells in each battery module, determine the battery capacity corresponding to each normal cell based on all charging and discharging status, and determine the capacity tier corresponding to each normal cell using the capacity tier relationship table.

[0079] In this embodiment, for each battery module, charging and discharging tests are performed on each cell in the battery module to obtain the charging and discharging status of each normal cell. The corresponding battery capacity is then determined based on the charging and discharging status of each normal cell, thus obtaining the battery capacity of multiple normal cells corresponding to each battery module. There are several ways to determine battery capacity based on charging and discharging status. One feasible method is to directly estimate the battery capacity, which mainly includes the open-circuit voltage method based on the state of charge definition, the model method, and the DV curve and IC curve methods. Another feasible method is to use SOH (State of Health) to solve for the remaining capacity. When solving for the remaining capacity based on SOH, direct acquisition methods, adaptive methods, and data-driven methods are mainly used. Of course, other methods can also be used to determine the battery capacity based on the charging and discharging status of normal cells, and this embodiment does not limit these methods.

[0080] Furthermore, based on the capacity tiering table, the corresponding capacity tier for each normal cell is determined. This method allows cells with similar capacities to be grouped into the same battery tier, and also facilitates the appropriate utilization of cells at different tiers. For example, when the battery capacity is 80%–100% of the initial battery capacity, the capacity tier is designated as tier A; when the battery capacity is 60%–79% of the initial battery capacity, the capacity tier is designated as tier B; when the battery capacity is 40%–59% of the initial battery capacity, the capacity tier is designated as tier C; when the battery capacity is 20%–39% of the initial battery capacity, the capacity tier is designated as tier D; and when the battery capacity is less than 20% of the initial battery capacity, the capacity tier is designated as tier E. Among them, battery cells with capacity in the A tier can still meet the needs of new energy vehicles. Battery cells with capacity in the B, C, and D tiers cannot meet the requirements for vehicle use, but can be used in low-power electric vehicles, grid energy storage, home energy storage, communication base stations, and other fields. In other words, they can be used for graded utilization of batteries. Battery cells with capacity in the E tier can no longer meet the standards for graded utilization and need to be scrapped and dismantled for recycling.

[0081] Step S104: For each capacity tier, recombine multiple normal cells corresponding to the capacity tier from all normal cells to obtain all battery modules. The total number of battery modules is the sum of multiple battery models corresponding to each capacity tier.

[0082] In the embodiments of this application, when recombining normal battery cells to obtain a battery module, if the individual battery capacities of the normal cells are not considered and they are combined arbitrarily, cells with significantly different capacities may be grouped into a single battery module. During charging and discharging operations on this battery module, the cells with lower capacities may experience overcharging or over-discharging, thus affecting the performance of the battery module. Therefore, in this application, a battery module is obtained by recombining normal cells corresponding to the same capacity tier. This method minimizes the difference in battery capacity among the multiple normal cells in the battery module, avoiding a bottleneck effect during battery tier utilization and improving the overall performance of the battery module.

[0083] As can be seen, in this embodiment, for each battery module, it is determined whether the battery module is deformed based on multi-angle images. If the battery module is deformed, abnormal cells and normal cells are identified from the battery module. If the battery module is not deformed, all cells are identified as normal cells. Then, based on the charging and discharging status of multiple normal cells in each battery module, the battery capacity and capacity tier corresponding to each normal cell are determined. Furthermore, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all paired battery modules. In this way, the battery capacity difference between multiple normal cells in the paired battery module is small, avoiding the bottleneck effect of the paired battery module when the battery is used in a gradient manner, and improving the performance of the paired battery module.

[0084] Furthermore, in order to ensure that the battery capacities of all normal cells constituting the battery modules are the same or similar, thereby guaranteeing high performance of the battery modules, in this embodiment of the application, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules, including:

[0085] For each capacity tier, the battery capacity of each normal cell corresponding to the capacity tier is numbered from smallest to largest. Multiple normal cells with the same battery capacity are recorded as having the same number.

[0086] For each capacity tier, all normal cells are recombined based on their respective numbers to obtain all battery modules.

[0087] In this embodiment, each capacity tier corresponds to a large number of normal cells. All normal cells corresponding to a capacity tier are numbered sequentially from largest to smallest battery capacity. Specifically, the difference between the battery capacity of a normal cell and the minimum capacity corresponding to the capacity tier is used as the cell's number. For example, if the capacity tier is B, and the corresponding battery capacity is between 60% and 79% of the initial battery capacity, then a normal cell with a capacity of 61% is numbered 1, and a normal cell with a capacity of 79% is numbered 19. This method ensures that normal cells with similar battery capacities are numbered similarly, and multiple normal cells with the same battery capacity are numbered the same.

[0088] For each capacity tier, all normal cells are recombined based on their corresponding serial numbers to obtain all paired battery modules. Preferably, multiple normal cells with the same serial number are combined first to form a paired battery module. If there are not enough normal cells with the same serial number to form a paired battery module, normal cells with similar serial numbers can be selected to form a paired battery module. In this way, all normal cells constituting a paired battery module have the same or similar battery capacity, so that the paired battery module does not have a bottleneck effect and the battery module performance is high.

[0089] As can be seen, in this embodiment of the application, for each capacity tier, the battery capacity of each normal cell corresponding to the capacity tier is numbered from smallest to largest, and then recombined based on the number to obtain all battery modules. In this way, the battery capacity of all normal cells constituting the battery module is the same or similar, so that the battery module will not have a bottleneck effect and the battery module has high performance.

[0090] Furthermore, to make the identification of abnormal and normal battery cells more accurate, in this embodiment of the application, if the battery module is deformed, the abnormal and normal battery cells in the battery module are identified, including:

[0091] If the battery module deforms, then obtain multiple first distances between each adjacent cell in the battery module and multiple second distances between each cell and the battery module casing.

[0092] Each first distance is compared with a first threshold to obtain the first result corresponding to each battery cell.

[0093] Each second distance is compared with the second threshold to obtain the second result corresponding to each cell.

[0094] Based on the first and second results corresponding to each cell, the abnormal and normal cells in the battery module are determined comprehensively.

[0095] In this embodiment, if the battery module deforms, it indicates that a cell within the battery module has bulged or deformed. Based on multiple first distances between adjacent cells within the battery module and multiple second distances between each cell and the battery module casing, normal and abnormal cells are identified within the battery module. Specifically, multiple first distances between adjacent cells and multiple second distances between each cell and the battery module casing are obtained. These distances can be determined using image recognition or distance sensors. Each first distance is then compared with a first threshold to obtain a first result for each cell, where the first threshold is the distance between adjacent cells when all cells within the battery module are undeformed. Each second distance is then compared with a second threshold to obtain a second result for each cell, where the second threshold is the distance between each cell and the battery module casing when all cells within the battery module are undeformed. Finally, based on the first and second results for each cell, abnormal and normal cells within the battery module are comprehensively determined.

[0096] As can be seen, in this embodiment of the application, if the battery module is deformed, multiple first distances between each adjacent cell in the battery module and multiple second distances between each cell and the battery module casing are obtained. Each first distance is compared with a first threshold to determine the first result corresponding to each cell. Then, each second distance is compared with a second threshold to obtain the second result corresponding to each cell. Combining the first and second results, the abnormal cells and normal cells in the battery module are determined, which makes the determination of abnormal cells and normal cells more accurate.

[0097] Furthermore, in order to ensure the performance of the battery modules and to save manpower and resources to a certain extent, in this embodiment of the application, after determining the capacity tier corresponding to each of the normal cells using the capacity tier relationship table, the following steps are also included:

[0098] For each battery module, if the battery module is deformed, the battery module will be marked as a disassembled battery module.

[0099] For each battery module, if the battery module is not deformed, it is determined whether the capacity tiers corresponding to all normal cells are the same. If so, the battery module is marked as the first matched battery module; otherwise, the battery module is marked as a disassembled battery module.

[0100] In this embodiment of the application, when performing graded utilization of batteries, normal cells of the same capacity grade need to be recombined to obtain battery modules. However, both disassembling a battery module into individual cells and assembling individual cells into battery modules require a significant amount of manpower and resources. To save manpower and resources, when performing graded utilization of batteries, if it is detected that all cells in a battery module are normal cells and are all within the same capacity grade, then the cells in that battery module are not disassembled, and the battery module is directly used as the first battery module. Preferably, all cells in the first battery module are normal and have a high capacity grade. A high capacity grade indicates that the battery has a low degree of aging and relatively high performance.

[0101] Specifically, if the battery module is deformed, it indicates that there are abnormal cells inside the battery module. Abnormal cells can no longer be used for battery gradation and must be disassembled and recycled. Therefore, deformed battery modules are marked as disassembled battery modules. If the battery module is not deformed, it indicates that all the cells inside are normal. Based on the capacity tiers of each normal cell in the battery module, it is determined whether they are of the same capacity tier. If the capacity tiers of each normal cell in the battery module are the same, then the battery module is directly used as the first battery module to be paired with the first battery module. That is, the first battery module to be paired with the first battery module has not undergone cell disassembly and recombination. If the capacity tiers of each normal cell in the battery module are not the same, it indicates that the battery capacities of the multiple normal cells in the battery module differ significantly. The battery module is marked as a disassembled battery module. If the battery module is used directly, the cells with lower battery capacities in the battery module will experience overcharging and over-discharging, affecting the performance of the battery module. Therefore, it is necessary to disassemble and recombine the normal cells in the battery module to improve the performance of the paired battery module.

[0102] Accordingly, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules, including:

[0103] For each capacity tier, all normal cells corresponding to all disassembled battery modules are recombined based on the capacity tier to obtain all second-group battery modules.

[0104] The first and second battery modules are identified as all battery modules.

[0105] In this embodiment, the disassembly and reassembly of cells are no longer performed on the first battery module group where all normal cells correspond to the same capacity tier. Instead, the disassembly and reassembly of cells are performed only on the disassembled battery modules with different capacity tiers. For each capacity tier, all normal cells corresponding to all disassembled battery modules are recombined based on the capacity tier. That is, normal cells with the same capacity tier among all normal cells corresponding to all disassembled battery modules are combined together to obtain all the second battery modules grouped together.

[0106] As can be seen, in this embodiment, if the battery module is not deformed and all normal cells within the battery module have the same capacity tier, the battery module is marked as a first-group battery module, and the cells within the battery module are no longer disassembled, saving manpower and resources to some extent. If the battery module is deformed, i.e., there are abnormal cells within the battery module, or all normal cells within the battery module have different capacity tiers, the battery module is marked as a disassembled battery module. Accordingly, for each capacity gradient, all normal cells corresponding to all disassembled battery modules are recombined based on their capacity tiers to obtain all second-group battery modules. In this way, it is possible to ensure that all normal cells in the grouped battery modules have the same capacity tier, guaranteeing the performance of the grouped battery modules, while also saving manpower and resources to some extent.

[0107] Furthermore, to facilitate timely replacement of mismatched cells and ensure that the final battery module maintains high performance at different temperatures, in this embodiment, after determining the first and second battery modules as all battery modules, the method further includes:

[0108] For each battery module, the first charge and discharge status of each normal cell in the battery module is obtained at the first temperature. The first charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time.

[0109] For each battery module, the second charge and discharge status of each normal cell in the battery module is obtained at the second temperature. The second charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time. The first temperature is lower than the second temperature.

[0110] For each battery module, based on the first and second charge / discharge states of all normal cells in the battery module, it is determined whether there are mismatched cells in the battery module.

[0111] If there are mismatched cells, they will be marked in the battery module to facilitate their replacement.

[0112] In this embodiment, after determining the battery modules, they are combined to form a battery pack. This battery pack provides power for low-power electric vehicles, grid energy storage, home energy storage, communication base stations, and other fields. However, the battery modules may operate at different ambient temperatures, and these temperatures can affect their performance. Therefore, for each battery module, the first charge / discharge status of each normal cell at a first temperature is obtained to obtain the corresponding first charge / discharge status for all normal cells at the first temperature. Similarly, for each battery module, the second charge / discharge status of each normal cell at a second temperature is obtained to obtain the corresponding second charge / discharge status for all normal cells at the second temperature. Both the first and second charge / discharge statuses include at least: cell temperature change, charging completion time, and discharging completion time; they may also include: voltage change, current change, and power change.

[0113] Then, based on the first and second charge / discharge states of all normal cells in each battery module, it is determined whether there are mismatched cells in the battery module. Specifically, for the first charge / discharge states of all normal cells in each battery module, it is determined whether there are mismatched cells. There are multiple ways to determine mismatched cells, as long as it can be determined that the mismatched cells are significantly different from the normal cells. For example, the standard charge / discharge states of normal cells in the battery module at the first temperature are pre-stored in the electronic device. Each data point in the standard charge / discharge states is a standard range. Then, the first charge / discharge states of all normal cells in each battery module are matched with the standard charge / discharge states. If the matching fails, the normal cell that failed to match is recorded as a mismatched cell. Then, for the second charge / discharge states of all normal cells in each battery module, it is determined whether there are mismatched cells. The method for determining mismatched cells is the same as the operation performed on the battery module at the first temperature. The normal cell that failed to match is recorded as a mismatched cell. The battery modules are tested at a first temperature and a second temperature. Cells whose performance does not match that of other cells at different temperatures are marked so that they can be replaced in a timely manner. This ensures that the final battery module can maintain high performance at different temperatures.

[0114] As can be seen, in this embodiment, for each battery module, the first charge / discharge status and the second charge status of each normal cell in the battery module are obtained at a first temperature and a second temperature, respectively. Based on the first charge / discharge status and the second charge status, mismatched cells in the battery module are comprehensively determined. This approach considers the impact of different temperatures on the cell charge / discharge status and identifies mismatched cells based on the charge / discharge status, facilitating timely replacement of mismatched cells. Therefore, it ensures that the final determined battery module can maintain high performance at different temperatures.

[0115] Furthermore, in order to ensure the stability of the gradient battery pack during operation in the application field to a certain extent, in this embodiment of the application, after obtaining all the matched battery modules, the following is also included:

[0116] For each capacity tier, multiple battery modules are selected from all battery modules and connected to obtain multiple graded battery packs corresponding to each capacity tier.

[0117] Based on the relationship between capacity tiers and applications, the corresponding application areas for each grade of battery pack are determined.

[0118] For each gradient battery pack, an application domain test plan is determined based on the application domain corresponding to the gradient battery pack, and the test results of the gradient battery pack under the application domain test plan are obtained. The test results are used to determine whether the gradient battery pack meets the working requirements of the application domain.

[0119] In the embodiments of this application, after connecting multiple battery modules to form a battery pack, and considering that the battery pack provides power for low-power electric vehicles, grid energy storage, home energy storage, communication base stations, and other fields, when using the battery pack as the main power supply for various fields of battery gradient utilization, it is necessary to consider the performance of the battery pack during the power supply process. In order to ensure that all normal cells in each battery module within the battery pack can achieve good performance, it is necessary to ensure that the battery capacity of all normal cells in the battery pack is relatively similar, and to a certain extent avoid overcharging and over-discharging of normal cells.

[0120] Specifically, for each capacity tier, multiple battery modules corresponding to the same capacity tier are selected and connected to obtain multiple graded battery packs for each capacity tier. Then, different application areas for battery graded utilization have different requirements for cell capacity; therefore, graded battery packs corresponding to different capacity tiers also have their own adaptive application areas. The application areas corresponding to each graded battery pack are determined based on the relationship between capacity tier and application. This relationship is determined by technical personnel in relevant fields based on extensive application experiments. Of course, users can also set it based on actual conditions. For example, Tier B, with a battery capacity of 60%–79% of the initial battery capacity, is suitable for applications such as communication base stations and low-power electric vehicles; Tier C, with a battery capacity of 40%–59% of the initial battery capacity, is suitable for applications such as grid energy storage; and Tier D, with a battery capacity of 20%–39% of the initial battery capacity, is suitable for applications such as home energy storage.

[0121] Furthermore, for each graded battery pack, an application-domain test plan is determined based on the corresponding application domain, and the test results of the graded battery pack under the application-domain test plan are obtained. The application-domain test plan is determined jointly based on the power consumption characteristics, environmental factors, and test standards of the application domain. Of course, it can also be determined by combining other factors of the application domain. Then, the test results of the graded battery pack under the application-domain test plan are obtained, and the test results are compared with the standard results. In this way, it is determined whether the graded battery pack meets the working requirements of the application domain. If it does not meet the requirements, the graded battery pack is modified accordingly.

[0122] As can be seen, in this embodiment, for each capacity tier, multiple battery modules corresponding to the same capacity tier are selected and connected to obtain multiple gradient battery packs corresponding to each capacity tier. The application fields corresponding to each gradient battery pack are determined. For each gradient battery pack, an application field test plan is determined based on the application field, and the test results of the gradient battery pack under the application field test plan are obtained to determine whether the gradient battery pack meets the working requirements of the application field. In this way, all gradient battery packs can be used in their applicable fields, and the test results corresponding to the application field test plan can determine whether the gradient battery pack meets the working requirements of the application field, thus ensuring the stability of the gradient battery pack when operating in the application field to a certain extent.

[0123] Furthermore, to ensure the safety of graded-utilization cells to a certain extent, in this embodiment of the application, a capacity tier relationship table is used to determine the corresponding capacity tier for each normal cell, including:

[0124] For each normal cell, determine whether the battery capacity corresponding to the normal cell is less than the minimum battery capacity value. If it is less, mark the normal cell as an abnormal cell.

[0125] If it is not less than, then the capacity tier corresponding to each of the normal cells is determined using the capacity tier relationship table.

[0126] In this embodiment of the application, there is a requirement regarding the percentage of battery capacity relative to the initial capacity during the battery tiered utilization process. That is, if the battery capacity is less than the minimum battery capacity value for tiered utilization, even normal cells without bulging or deformation cannot be used for tiered utilization and must be disassembled and recycled. Therefore, cells with a capacity less than the minimum battery capacity value are marked as abnormal cells. Preferably, the minimum battery capacity value is 20%, meaning cells with a capacity value less than 20% can no longer be used for tiered utilization. For cells with a capacity not less than the minimum battery capacity value, the capacity tier corresponding to each normal cell is determined using a capacity tier relationship table. In this way, cells with lower battery capacities can be screened, marked as abnormal cells, and disassembled and recycled, thus ensuring the safety of cells used for tiered utilization to a certain extent.

[0127] As can be seen, in this embodiment, if the battery capacity corresponding to a normal cell is less than the minimum battery capacity value, the normal cell is marked as an abnormal cell; if it is not less, the capacity tier corresponding to each of the normal cells is determined using a capacity tier table. In this way, cells with lower battery capacities can be screened, marked as abnormal cells, and dismantled and recycled, thus ensuring the safety of tiered cell utilization to a certain extent.

[0128] The above embodiments describe a battery gradient utilization method from the perspective of process flow. The following embodiments describe a battery gradient utilization device from the perspective of virtual module or virtual unit. For details, please refer to the following embodiments.

[0129] This application provides a battery gradient utilization device 200, such as... Figure 2 As shown, the battery gradient utilization device 200 may specifically include:

[0130] The module deformation judgment module 210 is used to acquire multi-angle images of each battery module and judge whether the battery module is deformed based on the multi-angle images. The battery module is composed of multiple battery cells.

[0131] The normal cell determination module 220 is used to determine abnormal cells and normal cells in the battery module if the battery module is deformed, and to determine all cells corresponding to the battery module as normal cells if the battery module is not deformed. Abnormal cells are cells that have been deformed, and normal cells are cells that have not been deformed.

[0132] The capacity tier determination module 230 is used to obtain the charging and discharging status of multiple normal cells in each battery module, determine the battery capacity corresponding to each normal cell based on all charging and discharging status, and determine the capacity tier corresponding to each normal cell using the capacity tier relationship table.

[0133] The cell recombination module 240 is used to recombine multiple normal cells corresponding to the capacity tier from all normal cells for each capacity tier to obtain all battery modules. The total number of battery modules is the sum of multiple battery models corresponding to each capacity tier.

[0134] In this embodiment, for each battery module, it is determined whether the battery module is deformed based on multi-angle images. If the battery module is deformed, abnormal cells and normal cells are identified from the battery module. If the battery module is not deformed, all cells are identified as normal cells. Then, based on the charging and discharging status of multiple normal cells in each battery module, the battery capacity and capacity tier corresponding to each normal cell are determined. Furthermore, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all paired battery modules. In this way, the battery capacity difference between multiple normal cells in the paired battery module is small, avoiding the bottleneck effect of the paired battery module when the battery is used in a gradient manner, and improving the performance of the paired battery module.

[0135] In one possible implementation of this application embodiment, when the cell recombination module 240 performs the operation of recombinating multiple normal cells corresponding to the capacity tier from all normal cells to obtain all matched battery modules for each capacity tier, it is used to:

[0136] For each capacity tier, the battery capacity of each normal cell corresponding to the capacity tier is numbered from smallest to largest. Multiple normal cells with the same battery capacity are recorded as having the same number.

[0137] For each capacity tier, all normal cells are recombined based on their respective numbers to obtain all battery modules.

[0138] In one possible implementation of this application embodiment, when the normal cell determination module 220 executes the function of determining abnormal and normal cells in the battery module if the battery module is deformed, it is used to:

[0139] If the battery module deforms, then obtain multiple first distances between each adjacent cell in the battery module and multiple second distances between each cell and the battery module casing.

[0140] Each first distance is compared with a first threshold to obtain the first result corresponding to each battery cell.

[0141] Each second distance is compared with the second threshold to obtain the second result corresponding to each cell.

[0142] Based on the first and second results corresponding to each cell, the abnormal and normal cells in the battery module are determined comprehensively.

[0143] In one possible implementation of this application embodiment, the battery gradient utilization device 200 further includes:

[0144] The first battery module matching module is used to mark each battery module as a disassembled battery module if the battery module is deformed.

[0145] For each battery module, if the battery module is not deformed, it is determined whether the capacity tiers corresponding to all normal cells are the same. If so, the battery module is marked as the first matched battery module; otherwise, the battery module is marked as a disassembled battery module.

[0146] Correspondingly, when the cell recombination module 240 performs the process of recombinating multiple normal cells corresponding to the capacity tier from all normal cells for each capacity tier to obtain all battery modules, it is used for:

[0147] For each capacity tier, all normal cells corresponding to all disassembled battery modules are recombined based on the capacity tier to obtain all second-group battery modules.

[0148] The first and second battery modules are identified as all battery modules.

[0149] In one possible implementation of this application embodiment, the battery gradient utilization device 200 further includes:

[0150] The mismatched cell determination module is used to obtain the first charge and discharge status of each normal cell in the battery module at a first temperature for each battery module. The first charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time.

[0151] For each battery module, the second charge and discharge status of each normal cell in the battery module is obtained at the second temperature. The second charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time. The first temperature is lower than the second temperature.

[0152] For each battery module, based on the first and second charge / discharge states of all normal cells in the battery module, it is determined whether there are mismatched cells in the battery module.

[0153] If there are mismatched cells, they will be marked in the battery module to facilitate their replacement.

[0154] In one possible implementation of this application embodiment, the battery gradient utilization device 200 further includes:

[0155] The application domain testing module is used to select multiple battery modules from all battery modules for each capacity level and connect them to obtain multiple graded battery packs corresponding to each capacity level.

[0156] Based on the relationship between capacity tiers and applications, the corresponding application areas for each grade of battery pack are determined.

[0157] For each gradient battery pack, an application domain test plan is determined based on the application domain corresponding to the gradient battery pack, and the test results of the gradient battery pack under the application domain test plan are obtained. The test results are used to determine whether the gradient battery pack meets the working requirements of the application domain.

[0158] In one possible implementation of this application embodiment, when the capacity tier determination module 230 performs the operation of determining the capacity tier corresponding to each of all normal cells using the capacity tier relationship table, it is used to:

[0159] For each normal cell, determine whether the battery capacity corresponding to the normal cell is less than the minimum battery capacity value. If it is less, mark the normal cell as an abnormal cell.

[0160] If it is not less than, then the capacity tier corresponding to each of the normal cells is determined using the capacity tier relationship table.

[0161] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the battery gradient utilization device 200 described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0162] This application provides an electronic device, such as... Figure 3 As shown, Figure 3 The illustrated electronic device 300 includes a processor 301 and a memory 303. The processor 301 and the memory 303 are connected, for example, via a bus 302. Optionally, the electronic device 300 may also include a transceiver 304. It should be noted that in practical applications, the transceiver 304 is not limited to one type, and the structure of this electronic device 300 does not constitute a limitation on the embodiments of this application.

[0163] Processor 301 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 301 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0164] Bus 302 may include a pathway for transmitting information between the aforementioned components. Bus 302 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 302 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 3 The symbol is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0165] The memory 303 may be a ROM (Read Only Memory) or other type of static storage device capable of storing static information and instructions, RAM (Random Access Memory) or other type of dynamic storage device capable of storing information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0166] The memory 303 is used to store application code that executes the solution of this application, and its execution is controlled by the processor 301. The processor 301 is used to execute the application code stored in the memory 303 to implement the content shown in the foregoing method embodiments.

[0167] Electronic devices include, but are not limited to: mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), and in-vehicle terminals (such as in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Servers can also be included. Figure 3 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0168] This application provides a computer-readable storage medium storing a computer program that, when run on a computer, enables the computer to execute the corresponding content in the aforementioned method embodiments. Compared with related technologies, this application, for each battery module, determines whether the battery module is deformed based on multi-angle images. If the battery module is deformed, abnormal and normal cells are identified from the battery module; if the battery module is not deformed, all cells are identified as normal. Then, based on the charging and discharging status of multiple normal cells in each battery module, the battery capacity and capacity tier corresponding to each normal cell are determined. Furthermore, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all paired battery modules. In this way, the battery capacity difference between multiple normal cells in the paired battery modules is smaller, avoiding the bottleneck effect of the paired battery modules when using batteries in a gradient manner, and improving the performance of the paired battery modules.

[0169] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0170] The above are only some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for gradient utilization of batteries, characterized in that, include: For each battery module, multi-angle images of the battery module are acquired, and it is determined whether the battery module is deformed based on the multi-angle images. The battery module is composed of multiple battery cells. If the battery module is deformed, abnormal cells and normal cells are identified in the battery module. If the battery module is not deformed, all cells corresponding to the battery module are identified as normal cells. Abnormal cells are cells that have been deformed, and normal cells are cells that have not been deformed. The charging and discharging status of multiple normal cells in each battery module is obtained. Based on all charging and discharging statuses, the battery capacity corresponding to each normal cell is determined, and the capacity tier corresponding to each normal cell is determined using the capacity tier relationship table. For each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules. The total number of battery modules is the sum of multiple battery models corresponding to each capacity tier. Specifically, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules, including: For each capacity tier, the battery capacity of each normal cell corresponding to the capacity tier is numbered from smallest to largest. Multiple normal cells with the same battery capacity are recorded as having the same number. For each capacity tier, all normal cells are recombined based on their respective numbers to obtain all battery modules. The method of determining the capacity tier corresponding to each normal cell using the capacity tier relationship table further includes: For each battery module, if the battery module is deformed, the battery module is marked as a disassembled battery module. For each battery module, if the battery module is not deformed, it is determined whether the capacity tiers corresponding to all normal cells are the same. If so, the battery module is marked as the first matched battery module; otherwise, the battery module is marked as a disassembled battery module. Accordingly, for each capacity tier, multiple normal cells corresponding to the capacity tier are recombined from all normal cells to obtain all battery modules, including: For each capacity tier, all normal cells corresponding to all disassembled battery modules are recombined based on the capacity tier to obtain all second-group battery modules. The first and second battery modules are identified as all battery modules. The step of determining the first and second battery modules as all battery modules further includes: For each battery module group, the first charge and discharge status of each normal cell in the battery module group is obtained at a first temperature, wherein the first charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time. For each battery module group, the second charge and discharge status of each normal cell in the battery module group is obtained at a second temperature. The second charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time. The first temperature is lower than the second temperature. For each battery module, based on the first charge / discharge status and the second charge / discharge status corresponding to each normal cell in the battery module, it is determined whether there are mismatched cells in the battery module. If there are mismatched cells, the mismatched cells will be marked in the battery module to facilitate their replacement.

2. The battery gradient utilization method according to claim 1, characterized in that, If the battery module is deformed, the abnormal and normal battery cells in the battery module are identified, including: If the battery module deforms, then obtain multiple first distances between each adjacent cell in the battery module and multiple second distances between each cell and the battery module casing; Each of the first distances is compared with the first threshold to obtain the first result corresponding to each battery cell. Each of the second distances is compared with the second threshold to obtain the second result corresponding to each cell. Based on the first result and the second result corresponding to each cell, the abnormal cells and normal cells in the battery module are determined comprehensively.

3. The battery gradient utilization method according to claim 1, characterized in that, After obtaining all the matched battery modules, the process also includes: For each capacity tier, multiple battery modules are selected from all battery modules and connected to obtain multiple graded battery packs corresponding to each capacity tier. Based on the relationship between capacity tiers and applications, the corresponding application areas for each grade of battery pack are determined. For each gradient battery pack, an application domain test plan is determined based on the application domain corresponding to the gradient battery pack, and the test results of the gradient battery pack under the application domain test plan are obtained. The test results are used to determine whether the gradient battery pack meets the working requirements of the application domain.

4. The battery gradient utilization method according to any one of claims 1 to 3, characterized in that, The process of determining the capacity tier corresponding to each normal cell using a capacity tier relationship table includes: For each normal battery cell, determine whether the battery capacity corresponding to the normal battery cell is less than the minimum battery capacity value. If it is less, mark the normal battery cell as an abnormal battery cell. If it is not less than, then the capacity tier corresponding to each of the normal cells is determined using the capacity tier relationship table.

5. A battery gradient utilization device, characterized in that, include: The module deformation judgment module is used to acquire multi-angle images of each battery module and determine whether the battery module is deformed based on the multi-angle images. The battery module is composed of multiple battery cells. A normal cell determination module is used to determine abnormal cells and normal cells in the battery module if the battery module is deformed, and to determine all cells corresponding to the battery module as normal cells if the battery module is not deformed. The abnormal cells are cells that have been deformed, and the normal cells are cells that have not been deformed. The capacity tier determination module is used to obtain the charging and discharging status of multiple normal cells in each battery module, determine the battery capacity corresponding to each normal cell based on all charging and discharging status, and determine the capacity tier corresponding to each normal cell using the capacity tier relationship table. The cell recombination module is used to recombine multiple normal cells corresponding to each capacity tier from all normal cells to obtain all battery modules. The total number of battery modules is the sum of multiple battery models corresponding to each capacity tier. When the cell recombination module performs the process of recombinating multiple normal cells corresponding to each capacity tier from all normal cells to obtain all matched battery modules, it is used for: For each capacity tier, the battery capacity of each normal cell corresponding to the capacity tier is numbered from smallest to largest. Multiple normal cells with the same battery capacity are recorded as having the same number. For each capacity tier, all normal cells are recombined based on their respective numbers to obtain all battery modules. The device also includes: The first battery module matching module is used to mark the battery module as a disassembled battery module if the battery module is deformed. For each battery module, if the battery module is not deformed, it is determined whether the capacity tiers corresponding to all normal cells are the same. If so, the battery module is marked as the first matched battery module; otherwise, the battery module is marked as a disassembled battery module. Correspondingly, when the cell recombination module performs the process of recombining multiple normal cells corresponding to each capacity tier from all normal cells to obtain all matched battery modules, it is used for: For each capacity tier, all normal cells corresponding to all disassembled battery modules are recombined based on the capacity tier to obtain all second-group battery modules. The first and second battery modules are identified as all battery modules. The device also includes: The mismatched cell determination module is used to obtain the first charge and discharge status of each normal cell in the battery module at a first temperature for each battery module. The first charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time. For each battery module group, the second charge and discharge status of each normal cell in the battery module group is obtained at a second temperature. The second charge and discharge status includes: cell temperature change, charging completion time, and discharging completion time. The first temperature is lower than the second temperature. For each battery module, based on the first charge / discharge status and the second charge / discharge status corresponding to each normal cell in the battery module, it is determined whether there are mismatched cells in the battery module. If there are mismatched cells, the mismatched cells will be marked in the battery module to facilitate their replacement.

6. An electronic device, characterized in that, include: At least one processor; Memory; At least one application, wherein the at least one application is stored in memory and configured to be executed by at least one processor, said at least one application being configured to: perform the method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed in a computer, causes the computer to perform the method described in any one of claims 1 to 4.

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