A method and device for determining the uniformity of a power battery pack

Abstract

This application provides a method and apparatus for determining the temperature uniformity of a power battery pack. The method includes: first, obtaining a preset battery pack design scheme; then, constructing a heat transfer path model based on the battery pack design scheme; then, performing a heat flow field simulation based on the heat transfer path model to obtain simulation results; next, quantitatively analyzing the heat transfer power of the heat transfer path based on the simulation results to obtain quantitative analysis results; and finally, determining a battery pack design scheme that meets the temperature uniformity requirements based on the quantitative analysis results. This method can quickly perform quantitative analysis of the heat transfer path, is low-cost, and can quickly propose optimization schemes.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and more specifically, to a method and apparatus for determining the temperature uniformity of a power battery pack. Background Technology

[0002] A power battery is a type of battery that provides electrical energy to various vehicles. Compared to ordinary batteries that power small devices, it has a larger energy reserve, capable of meeting greater energy demands. Existing methods for determining the uniform temperature performance of a battery pack typically involve conducting environmental simulation tests on physical samples to obtain the temperature difference results. However, in practice, it has been found that existing methods require physical samples, are costly and time-consuming; moreover, they can only obtain the temperature difference results of the battery pack and cannot quantitatively analyze the transmission path, thus failing to quickly propose optimization solutions. Therefore, existing methods are costly, time-consuming, cannot quantitatively analyze the transmission path, and cannot quickly propose optimization solutions. Summary of the Invention

[0003] The purpose of this application is to provide a method and apparatus for determining the temperature uniformity of a power battery pack, which can quickly perform quantitative analysis of the transmission path, has low cost, and thus quickly propose optimization solutions.

[0004] The first aspect of this application provides a method for determining the temperature uniformity of a power battery pack, including:

[0005] Obtain the preset battery pack design scheme;

[0006] Based on the battery pack design scheme, a heat transfer path model is constructed;

[0007] The heat transfer path model was used to simulate the thermal field, and the simulation results were obtained.

[0008] The heat transfer power of the heat transfer path is quantitatively analyzed based on the simulation results, and the quantitative analysis results are obtained.

[0009] Based on the quantitative analysis results, a battery pack design scheme that meets the temperature uniformity requirements is determined.

[0010] In the above implementation process, a preset battery pack design scheme is first obtained; then, a heat transfer path model is constructed based on the battery pack design scheme; next, a heat flow field simulation is performed based on the heat transfer path model to obtain simulation results; then, the heat transfer power of the heat transfer path is quantitatively analyzed based on the simulation results to obtain quantitative analysis results; finally, a battery pack design scheme that meets the temperature uniformity requirements is determined based on the quantitative analysis results. This method can quickly perform quantitative analysis of the heat transfer path, is low-cost, and thus quickly proposes an optimization scheme.

[0011] Furthermore, the step of constructing a heat transfer path model based on the battery pack design includes:

[0012] Determine the structural topology of the battery pack system based on the aforementioned battery pack design scheme;

[0013] Based on the battery pack design scheme and the structural topology, a heat transfer path model for internal heat exchange in the battery pack system is constructed.

[0014] Furthermore, the simulation of the heat flow field based on the heat transfer path model, and the resulting simulation results, include:

[0015] A battery pack mesh model is established based on the heat transfer path model.

[0016] The battery pack mesh model was used to simulate the low-temperature heating condition of the battery, and the simulation results were obtained.

[0017] Furthermore, the heat transfer path model includes at least the heat exchange topology between the battery module, end plate, thermally conductive adhesive, water-cooled plate, coolant, and battery pack structural beams.

[0018] A second aspect of this application provides a device for determining the temperature uniformity of a power battery pack, the device comprising:

[0019] The acquisition unit is used to acquire a preset battery pack design scheme;

[0020] The building unit is used to build a heat transfer path model based on the battery pack design scheme.

[0021] The simulation unit is used to perform flow heat field simulation based on the heat transfer path model and obtain simulation results.

[0022] The analysis unit is used to quantitatively analyze the heat transfer power of the heat transfer path based on the simulation results, and obtain quantitative analysis results.

[0023] The determining unit is used to determine a battery pack design scheme that meets the temperature uniformity requirements based on the quantitative analysis results.

[0024] In the above implementation process, the acquisition unit first acquires the preset battery pack design scheme; the construction unit then constructs a heat transfer path model based on the battery pack design scheme; the simulation unit then performs flow and heat field simulation based on the heat transfer path model to obtain simulation results; next, the analysis unit quantitatively analyzes the heat transfer power of the heat transfer path based on the simulation results to obtain quantitative analysis results; finally, the determination unit determines the battery pack design scheme that meets the temperature uniformity requirements based on the quantitative analysis results. This allows for rapid quantitative analysis of the heat transfer path at a low cost, thereby quickly proposing optimization schemes.

[0025] Furthermore, the building unit includes:

[0026] Determine the sub-unit, which is used to determine the structural topology of the battery pack system according to the battery pack design scheme;

[0027] A sub-unit is constructed to build a heat transfer path model for internal heat exchange of the battery pack system based on the battery pack design scheme and the structural topology.

[0028] Furthermore, the simulation unit includes:

[0029] Establish sub-units to create a battery pack mesh model based on the heat transfer path model;

[0030] The simulation subunit is used to simulate the low-temperature heating condition of the battery based on the battery pack mesh model and obtain simulation results.

[0031] Furthermore, the heat transfer path model includes at least the heat exchange topology between the battery module, end plate, thermally conductive adhesive, water-cooled plate, coolant, and battery pack structural beams.

[0032] A third aspect of this application provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor runs the computer program to cause the electronic device to perform the method for determining the temperature uniformity of a power battery pack as described in any one of the first aspects of this application.

[0033] The fourth aspect of this application provides a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, perform the method for determining the temperature uniformity of a power battery pack as described in any of the first aspects of this application. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A flowchart illustrating a method for determining the temperature uniformity of a power battery pack, provided in an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of a device for determining the temperature uniformity of a power battery pack, provided in an embodiment of this application.

[0037] Figure 3 A schematic diagram of a power battery pack structure model provided in an embodiment of this application;

[0038] Figure 4 A schematic diagram of a module structure provided in an embodiment of this application;

[0039] Figure 5 A schematic diagram of a heat exchange topology provided in an embodiment of this application;

[0040] Figure 6 A schematic diagram of a heat transfer path provided in an embodiment of this application;

[0041] Figure 7 A schematic diagram of a battery pack mesh model provided in an embodiment of this application;

[0042] Figure 8 A schematic diagram of the internal temperature cloud of a battery provided in an embodiment of this application;

[0043] Figure 9 A schematic diagram of the internal temperature rise curve of a battery provided in an embodiment of this application;

[0044] Figure 10 A schematic diagram of a low-temperature heating path for a battery module M1 provided in an embodiment of this application;

[0045] Figure 11 A schematic diagram of the heating path of a battery module M8 provided in an embodiment of this application;

[0046] Figure 12 A schematic diagram of an optimized structure of a battery pack design provided in an embodiment of this application;

[0047] Figure 13 A schematic diagram of the temperature distribution of an optimized battery pack obtained through modeling and simulation analysis, provided in an embodiment of this application;

[0048] Figure 14 A schematic diagram of the temperature rise curve of an optimized battery pack obtained through modeling and simulation analysis, provided in an embodiment of this application;

[0049] Figure 15 A schematic diagram of the experimental temperature rise curve obtained from the test of a battery pack design scheme provided in this application embodiment.

[0050] Icons: M1, M2, M3, M4, M5, M6, M7, M8 - Battery modules; 1, 2 - Water cooling plates. Detailed Implementation

[0051] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0052] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] Example 1

[0054] Please refer to Figure 1 , Figure 1 This application provides a flowchart illustrating a method for determining the temperature uniformity of a power battery pack. The method includes:

[0055] S101. Obtain the preset battery pack design scheme.

[0056] S102. Determine the structural topology of the battery pack system based on the battery pack design scheme.

[0057] S103. Based on the battery pack design scheme and structural topology, construct a heat transfer path model for internal heat exchange in the battery pack system.

[0058] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram of a power battery pack structure model provided in an embodiment of this application. First, a heat transfer path model is constructed based on the battery pack design scheme. Let the power battery pack structure model of a certain BEV model be as follows: Figure 3 As shown, the battery pack consists of 8 battery modules (128 cells) connected in series. These 8 battery modules are M1, M2, M3, M4, M5, M6, M7, and M8. The bottom of each cell has a thermal pad and a water-cooling plate. Water-cooling plates 1 and 2 of the battery pack have identical structures, and the water tank design is as follows... Figure 3 As shown, it adopts a 6-in, 4-out design. The module structure is as follows: Figure 4 As shown, a module consists of 16 cells, with four cells separated by foam. Both ends are fixed to the battery pack structural beam by fixed end plates, and the fixed end plates are separated from the batteries by insulating PC (Polycarbonate) boards.

[0059] In this embodiment of the application, a physical model of the internal heat exchange of the battery pack system can be constructed based on the battery pack design scheme and its structural topology, that is, the heat transfer path model of the internal heat exchange of the battery pack system. Figure 5 The heat exchange topology between the battery module, end plate, thermally conductive adhesive, water-cooled plate, coolant, and battery pack structural beams is shown. Based on... Figure 5 It can be seen that there are three main heat transfer paths in the battery pack. For example... Figure 6 As shown, path ① includes: coolant → cold plate → thermally conductive adhesive → battery module; path ② includes: coolant → cold plate → structural beam → left end plate → battery module; path ③ includes: coolant → cold plate → structural beam → right end plate → battery module. Path ① and path ③ heat the battery module through both ends, while path ② heats the battery through the bottom of the battery module.

[0060] In this embodiment of the application, the heat transfer path model includes at least the heat exchange topology between the battery module, end plate, thermally conductive adhesive, water-cooled plate, coolant, and battery pack structural beam.

[0061] S104. Establish the battery pack mesh model based on the heat transfer path model.

[0062] In this embodiment of the application, a battery pack mesh model is established based on the heat transfer path model, that is, a battery pack mesh model is established based on the three-dimensional geometric model of the battery pack.

[0063] S105. Simulate the battery under low-temperature heating conditions based on the battery pack mesh model and obtain the simulation results.

[0064] In this embodiment of the application, the battery pack temperature field is obtained by modeling and simulating the battery pack system using the CFD (Computational Fluid Dynamics) method. For example... Figure 7 As shown, the battery cells, fixed end plates, PC, foam, thermally conductive adhesive, water-cooling plates, and structural beams utilize polyhedral meshes, while the fluid domain employs a polyhedral mesh with a boundary layer, resulting in a final mesh count of approximately 13 million. Based on the low-temperature heating test conditions and relevant vehicle parameters, a simulation of the battery's low-temperature heating operation was performed. The ambient temperature was -30℃, the initial temperature was -30℃, the inlet flow rate was 10L / min, and the inlet water temperature was 45℃. After 40 minutes of heating, the internal temperature cloud map of the battery is shown below. Figure 8 As shown, the internal temperature rise curve of the battery is as follows: Figure 9 As shown.

[0065] In this embodiment of the application, in order to verify the reliability of the thermal simulation model of the battery system, the simulated temperature change during the low-temperature heating process was compared with the experimental values. As shown in Table 1, the simulation results and experimental results show consistent trends. The maximum error of the thermal simulation model is 0.5℃, and the errors of the highest and lowest temperatures and the maximum temperature difference are all within 5%. Further comparison of the simulation and experimental results of individual modules is shown in Table 2. The maximum error of the simulation and experiment for the maximum temperature difference of each module is about 3%, and the overall error is within an acceptable range, indicating that the model can meet the requirements of temperature calculation and analysis.

[0066] Table 1 Comparison of Simulated and Experimental Battery Temperature Data

[0067]

[0068] Table 2 Comparison of Module Temperature Difference Simulation and Experimental Data

[0069]

[0070] Following step S105, the following steps are also included:

[0071] S106. Quantitatively analyze the heat transfer power of the heat transfer path based on the simulation results, and obtain the quantitative analysis results.

[0072] In this embodiment, when quantitatively analyzing the heat transfer power of the heat transfer path based on simulation results, the heating and heat transfer power on each path within the battery pack are quantitatively analyzed based on the results of the low-temperature heating simulation calculation model. Analysis of the temperature cloud map of the entire battery pack shows that battery module M1 has the highest temperature among the eight battery modules, while battery module M8 has the lowest temperature. The temperature difference between battery modules M1 and M8 directly affects the maximum temperature difference of the entire pack. Furthermore, analyzing the temperature difference within a single module, battery module M1 has the largest temperature difference at 18.3 degrees Celsius, while battery module M8 has a maximum temperature difference of 8.5 degrees Celsius. This indicates that while controlling the temperature difference between modules, it is also necessary to consider adjusting the temperature difference within a single module.

[0073] Figure 10 This is the low-temperature heating path for battery module M1. Figure 11 The heating paths for battery module M8 are as follows: For a single battery module, heating path ①: lower water-cooled plate → thermally conductive adhesive → battery module. The temperature distribution of the battery is that the bottom temperature is higher and the upper surface temperature is lower. The temperature difference of the module mainly depends on the Z-thermal conductivity of the cell. Since the Z-thermal conductivity of the cell is relatively large, about 18 W / (m·K), a large temperature gradient will not be formed in the height direction. Heating paths ② and ③, which are the heating paths of the end plates on both sides of the battery module, have the heat conduction direction in the cell thickness direction. The thermal conductivity of the cell in this direction is low (1 W / (m·K)), about 1 / 18 of that in the Z direction. In addition, there is a thermal insulation foam with extremely low thermal conductivity (0.04 W / (m·K)) between the cells. This will result in the cells near the end plates of the module having a high temperature and the cells in the middle having a low temperature, resulting in a large temperature difference within the module. The above analysis revealed that the main reason for the large temperature difference within the module is the combined effect of heating on both sides of the end plate and the relatively low thermal conductivity in the thickness direction of the battery cell.

[0074] S107. Determine the battery pack design scheme that meets the temperature uniformity requirements based on the quantitative analysis results.

[0075] In this embodiment of the application, based on the quantitative analysis results, the heating path of the battery module needs to be adjusted to unidirectional heating, that is, heating of the thermally conductive adhesive at the bottom of the module, to minimize the heat source of the heat transfer path on both side end plates. The optimized structure is as follows: Figure 12As shown, a 1.5mm thick foam was added between the end plate and the PC board. The foam has a low thermal conductivity, approximately 0.04 W / (m·K), which is 1 / 5 that of the PC board. This increases the thermal resistance between the battery cells at both ends of the battery module and the end plate, effectively blocking heat conduction from the end plate side. The optimized battery pack temperature distribution was obtained through modeling and simulation analysis as shown below. Figure 13 As shown, the temperature rise curve of the optimized battery pack obtained through modeling and simulation analysis is as follows: Figure 14 As shown in the figure. Simulation results show that the maximum temperature difference is significantly reduced compared to the original scheme, reaching approximately 12.2℃, which is lower than the target value of 15.0℃. This indicates that the obtained battery pack design scheme meets the low-temperature heating temperature difference performance target and optimizes the temperature field distribution. The final battery pack design scheme underwent experimental testing, and the experimental temperature rise curve is shown in the figure. Figure 15 As shown, the battery pack has a maximum temperature difference of 12.5℃, which is less than the design target of 15℃, meeting the requirements for low-temperature heating performance.

[0076] In this embodiment of the application, the method is to establish a heat exchange and heat transfer path model based on the battery pack design scheme and topology, then perform flow thermal field simulation using CFD method to obtain the temperature field results of the battery pack, then quantitatively analyze the heat transfer power of the heat transfer path based on the simulation model, and then determine the uniform temperature performance and optimization scheme of the battery pack based on the quantitative analysis results of the path, and finally obtain a battery pack system scheme that meets the uniform temperature performance requirements.

[0077] In this embodiment, the method can evaluate the temperature uniformity performance of the battery pack in the early stages of battery pack design. It not only obtains the temperature field and temperature difference results of the battery pack, but also performs quantitative analysis of the heat transfer path, quickly identifying optimized solutions that meet design objectives. This significantly shortens development time, saves costs, and improves the iterative efficiency of battery pack thermal management design schemes.

[0078] In this embodiment, the subject executing the method can be a computing device such as a computer or server, and no limitation is made in this embodiment.

[0079] In this embodiment, the subject executing the method can also be a smart device such as a smartphone or tablet, and no limitation is made in this embodiment.

[0080] As can be seen, the method for determining the temperature uniformity of the power battery pack described in this embodiment can quickly perform quantitative analysis of the transmission path, with low cost, thereby quickly proposing optimization solutions.

[0081] Example 2

[0082] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a device for determining the temperature uniformity of a power battery pack, provided as an embodiment of this application. Figure 2As shown, the device for determining the temperature uniformity of the power battery pack includes:

[0083] Acquisition unit 210 is used to acquire a preset battery pack design scheme;

[0084] Building unit 220 is used to build a heat transfer path model based on the battery pack design scheme;

[0085] Simulation unit 230 is used to perform flow heat field simulation based on the heat transfer path model and obtain simulation results;

[0086] Analysis unit 240 is used to quantitatively analyze the heat transfer power of the heat transfer path based on the simulation results and obtain quantitative analysis results;

[0087] The determination unit 250 is used to determine the battery pack design scheme that meets the temperature uniformity requirements based on the quantitative analysis results.

[0088] As an optional implementation, the building unit 220 includes:

[0089] Subunit 221 is defined to determine the structural topology of the battery pack system based on the battery pack design scheme.

[0090] Subunit 222 is constructed to build a heat transfer path model for internal heat exchange of the battery pack system based on the battery pack design scheme and structural topology.

[0091] As an optional implementation, the simulation unit 230 includes:

[0092] Sub-unit 231 is created to establish the battery pack mesh model based on the heat transfer path model.

[0093] Simulation subunit 232 is used to simulate the low-temperature heating condition of the battery based on the battery pack mesh model and obtain simulation results.

[0094] In this embodiment of the application, the heat transfer path model includes at least the heat exchange topology between the battery module, end plate, thermally conductive adhesive, water-cooled plate, coolant, and battery pack structural beam.

[0095] In this embodiment, the explanation of the device for determining the temperature uniformity of the power battery pack can be referred to the description in Embodiment 1, and will not be repeated here.

[0096] As can be seen, the device for determining the temperature uniformity of the power battery pack described in this embodiment can quickly perform quantitative analysis of the transmission path at a low cost, thereby rapidly proposing optimization solutions.

[0097] This application provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor runs the computer program to enable the electronic device to perform the method for determining the temperature uniformity of a power battery pack as described in Embodiment 1 of this application.

[0098] This application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the method for determining the temperature uniformity of a power battery pack in embodiment 1 of this application is performed.

[0099] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0100] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0101] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0102] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0103] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0104] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for determining the homogeneity of a power battery pack, characterized in that The method comprises the following steps: obtaining a preset battery pack design scheme; constructing a heat transfer path model according to the battery pack design scheme; the heat transfer path model is a three-dimensional geometric model of the battery pack; establishing a battery pack grid model according to the heat transfer path model; the battery pack grid model comprises polyhedral grids corresponding to the battery cell, the fixed end plate, the PC plate, the foam, the heat-conducting glue, the water-cooling plate, and the structural beam, and polyhedral boundary layer grids corresponding to the fluid domain; performing flow and heat field simulation on the battery low-temperature heating working condition according to the battery pack grid model to obtain simulation results; quantitatively analyzing the heat transfer power of the heat transfer path according to the simulation results to obtain quantitative analysis results; determining a battery pack design scheme that meets the uniform temperature requirement according to the quantitative analysis results; wherein, according to the battery pack design scheme, the heat transfer path model is constructed, which comprises: determining the structural topology relationship of the battery pack system according to the battery pack design scheme; constructing the heat transfer path model of the internal heat exchange of the battery pack system according to the battery pack design scheme and the structural topology relationship; wherein, the heat transfer path model at least comprises the heat exchange topology relationship between the battery module, the fixed end plate, the heat-conducting glue, the water-cooling plate, the cooling liquid, and the structural beam; wherein, the heat transfer path of the battery pack includes three main paths, path 1 includes: cooling liquid→water-cooling plate→heat-conducting glue→battery module; path 2 includes: cooling liquid→water-cooling plate→structural beam→left end plate→battery module, and path 3 includes: cooling liquid→water-cooling plate→structural beam→right end plate→battery module, wherein, path 1 and path 3 heat the battery module through both ends, and path 2 heats the battery through the bottom of the battery module.

2. A device for determining the homogeneity of a power battery pack, characterized in that The determination device of the uniform temperature of the power battery pack comprises: an obtaining unit configured to obtain a preset battery pack design scheme; a constructing unit configured to construct a heat transfer path model according to the battery pack design scheme; the heat transfer path model is a three-dimensional geometric model of the battery pack; a simulation unit configured to perform flow and heat field simulation according to the heat transfer path model to obtain simulation results; an analysis unit configured to quantitatively analyze the heat transfer power of the heat transfer path according to the simulation results to obtain quantitative analysis results; a determining unit configured to determine a battery pack design scheme that meets the uniform temperature requirement according to the quantitative analysis results; wherein, the simulation unit comprises: an establishing subunit configured to establish a battery pack grid model according to the heat transfer path model; wherein, the battery pack grid model comprises polyhedral grids corresponding to the battery cell, the fixed end plate, the PC plate, the foam, the heat-conducting glue, the water-cooling plate, and the structural beam, and polyhedral boundary layer grids corresponding to the fluid domain; a simulation subunit configured to perform flow and heat field simulation on the battery low-temperature heating working condition according to the battery pack grid model to obtain simulation results; wherein, the constructing unit comprises: a determining subunit configured to determine the structural topology relationship of the battery pack system according to the battery pack design scheme; a constructing subunit configured to construct the heat transfer path model of the internal heat exchange of the battery pack system according to the battery pack design scheme and the structural topology relationship. The heat transfer path model at least includes a heat exchange topological relationship between a battery module, a fixed end plate, a heat-conducting adhesive, a water-cooling plate, cooling liquid, and a structural beam. The heat transfer path of the battery pack includes three main paths, path 1 includes: cooling liquid→water-cooling plate→heat-conducting adhesive→battery module; path 2 includes: cooling liquid→water-cooling plate→structural beam→left end plate→battery module, and path 3 includes: cooling liquid→water-cooling plate→structural beam→right end plate→battery module, wherein path 1 and path 3 heat the battery module through two ends, and path 2 heats the battery through the bottom of the battery module.

3. An electronic device, comprising: The electronic device includes a memory and a processor, the memory is used for storing a computer program, and the processor runs the computer program to make the electronic device execute the determination method of the power battery pack uniformity.

4. A readable storage medium, characterized by, The readable storage medium stores computer program instructions, and the computer program instructions are read and run by a processor to execute the determination method of the power battery pack uniformity.

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