Temperature analysis method for battery cell, optimized design method for heating module, and electronic device system

Abstract

The present application provides a temperature analysis method for a battery cell, comprising: constructing a three-dimensional model of a battery cell and a three-dimensional model of a heating module; performing grid division, and setting boundary conditions and initial conditions; and on the basis of the boundary conditions and the initial conditions, iteratively calculating the temperature change data of the battery cell, so as to accurately simulate the temperature distribution of the battery cell. The present application provides an optimized design method for a heating module, comprising the temperature analysis method for the battery cell. The present application also provides an electronic device system, comprising a program for implementing the temperature analysis method for the battery cell.

Description

Battery temperature analysis method, heating module optimization design method and electronic device system

[0001] The present application claims priority to the Chinese patent application No. 202410865222.3, filed on June 28, 2024, to the Chinese Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery temperature analysis, in particular to a battery temperature analysis method, a heating module optimization design method and an electronic device system. BACKGROUND

[0003] The optimization of the battery baking process is focused on the design of the baking time parameter, the design of the baking fixture, the adaptive design of the carrier and the safety design, and the influence of the shape and position of the heating module on the baking temperature of the battery is ignored. TECHNICAL PROBLEM

[0004] The shape of the heating module plays an important role in battery baking, but in the related art, it is inconvenient to monitor and analyze the process of baking the battery by the heating module, and repeated design of the heating module for battery baking experiments will cause waste of time and cost, and low production efficiency. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a battery temperature analysis method, which comprises the following steps:

[0006] Constructing a three-dimensional model of the battery and the heating module;

[0007] Dividing the three-dimensional model into grids, and setting boundary conditions and initial conditions for the battery and the heating module respectively;

[0008] Based on the boundary conditions and the initial conditions, iteratively calculating the temperature change data of the battery.

[0009] In a second aspect, the present application provides a heating module optimization design method, which comprises the battery temperature analysis method provided by the present application, and after the step of iteratively calculating the temperature change data of the battery based on the boundary conditions and the initial conditions, the method comprises:

[0010] Obtaining the temperature change data, and processing the three-dimensional model of the heating module based on the temperature change data.

[0011] In a third aspect, the present application provides an electronic device system, which comprises a processor, a memory and a program stored in the memory, wherein the processor executes the program to realize the steps in the battery temperature analysis method provided by the present application. ADVANTAGEOUS EFFECTS

[0012] The temperature analysis method of the battery cell provided in the application has the beneficial effects that, compared with the related art, the temperature analysis method of the battery cell includes constructing a three-dimensional model of the battery cell and the heating module, performing mesh division on the three-dimensional model, and setting boundary conditions and initial conditions of the battery cell and the heating module, and iteratively calculating temperature change data of the battery cell based on the boundary conditions and the initial conditions, so that the temperature distribution of the battery cell and the heating module can be simulated more accurately through model construction, mesh division and condition setting; temperature analysis of the process of baking the battery cell by different heating modules designed by using the temperature analysis method of the battery cell provided in the application is beneficial to saving manpower and material resources, and is beneficial to analyzing the baking efficiency and uniformity of the battery cell by the heating module, and the shape, position, size and other parameter design of the heating module can be optimized according to the simulated heating of the battery cell by the heating module; the application provides an optimization design method of the heating module, which includes the steps of the temperature analysis method of the battery cell provided in the application, and an electronic device system is also provided, which includes a program and a processor and a memory capable of implementing the steps of the temperature analysis method of the battery cell provided in the application, and has the beneficial effects of the application. BRIEF DESCRIPTION OF DRAWINGS

[0013] FIG. 1 is a flowchart of the temperature analysis method of the battery cell provided in some embodiments of the application;

[0014] FIG. 2 is a flowchart of one of the steps S100 in FIG. 1;

[0015] FIG. 3 is another flowchart of the step S100 in FIG. 1;

[0016] FIG. 4 is a structural diagram of the polyhedral mesh division based on the fluid domain in the step P100;

[0017] FIG. 5 is a flowchart of the step S200 in FIG. 1;

[0018] FIG. 6 is a three-dimensional model constructed in one application scenario of the application;

[0019] FIG. 7 is a temperature cloud chart of the center section of the battery cell of the three-dimensional model in FIG. 6;

[0020] FIG. 8 is a temperature cloud chart of the surface of the battery cell of the three-dimensional model in FIG. 6;

[0021] FIG. 9 is a three-dimensional model constructed in another application scenario of the application;

[0022] FIG. 10 is a temperature cloud chart of the center section of the battery cell of the three-dimensional model in FIG. 9;

[0023] FIG. 11 is a temperature cloud chart of the surface of the battery cell of the three-dimensional model in FIG. 9;

[0024] FIG. 12 is a three-dimensional model constructed in another application scenario of the present application;

[0025] FIG. 13 is a temperature cloud chart of the center cross section of the battery cell of the three-dimensional model in FIG. 12;

[0026] FIG. 14 is a surface temperature cloud chart of the battery cell of the three-dimensional model in FIG. 12;

[0027] FIG. 15 is a three-dimensional model constructed in another application scenario of the present application;

[0028] FIG. 16 is a temperature cloud chart of the center cross section of the battery cell of the three-dimensional model in FIG. 15;

[0029] FIG. 17 is a surface temperature cloud chart of the battery cell of the three-dimensional model in FIG. 15;

[0030] FIG. 18 is a three-dimensional model constructed in another application scenario of the present application;

[0031] FIG. 19 is a temperature cloud chart of the center cross section of the battery cell of the three-dimensional model in FIG. 18;

[0032] FIG. 20 is a surface temperature cloud chart of the battery cell of the three-dimensional model in FIG. 18;

[0033] FIG. 21 is a flowchart of an optimization design method of a heating module provided by some embodiments of the present application;

[0034] FIG. 22 is a structural schematic diagram of an electronic device provided by some embodiments of the present application.

[0035] In the drawings, various reference signs are used, and the following meanings are assigned to them: 10, battery cell; 20, heating module; 30, environmental medium; 21, first sub-module; 22, second sub-module; 23, third sub-module; 100, electronic device system; 110, processor; 120, memory.

[0036] Embodiments of the present application

[0037] The present application provides a temperature analysis method of a battery cell, simulates a baking process of the battery cell by a heating module, and performs auxiliary prediction on the baking process of the battery cell to assist in the design and manufacture of related products.

[0038] In the present application, the battery cell can refer to a lithium ion battery, and can specifically be a square battery cell or a cylindrical battery cell, and can be used in the fields of electric vehicles, power tools, mobile power sources, energy storage systems, electronic products, aerospace, weapon equipment, robots, medical devices, military equipment, etc.

[0039] Referring to FIGS. 1 to 5, the temperature analysis method of the battery cell provided by the embodiments of the present application will be described. The heating module of the present application is used to bake the battery cell, as shown in FIG. 1, and the temperature analysis method of the battery cell provided by the present application includes the following steps:

[0040] Step S100, constructing a three-dimensional model of the battery cell and the heating module;

[0041] Step S200, meshing the three-dimensional model and setting boundary conditions and initial conditions of the battery cell and the heating module respectively;

[0042] Step S300, iteratively calculating the temperature change data of the battery cell based on the boundary conditions and the initial conditions.

[0043] The battery cell temperature analysis method of the present application can more accurately simulate the temperature distribution of the battery cell and the heating module, and verify the heating effect of the designed different heating modules through the steps of model construction, meshing and condition setting. The temperature analysis of the process of baking the battery cell by the different heating modules designed by the battery cell temperature analysis method of the present application is beneficial to save the cost of manpower and material resources. The baking efficiency and uniformity of the heating module on the battery cell can be analyzed by the simulation method.

[0044] The following will introduce each step in detail.

[0045] Step S100, constructing a three-dimensional model of the battery cell and the heating module.

[0046] The three-dimensional model of the battery cell and the heating module includes the three-dimensional model of the battery cell, the heating module and the environmental medium.

[0047] In the present embodiment, constructing the three-dimensional model of the battery cell means creating and simulating the structure based on the shape, structure, etc. of the battery cell. Specifically, it can be performed according to the components of the battery cell, for example, the three-dimensional model of each component of the battery cell can be constructed respectively, or the different partitions of the battery cell can be constructed, wherein a partition can include one or more components of the battery cell. The construction of the three-dimensional model of the heating module means creating and simulating the structure based on the shape, position and size structure, etc. of the heating module. The position of the heating module includes the internal position setting of the heating module, and also includes the relative position setting between the heating module and the battery cell.

[0048] The three-dimensional model of the battery cell and the heating module includes the corresponding three-dimensional models of the battery cell, the heating module and the environmental medium. In the present embodiment, the battery cell and the heating module form a solid domain. The environmental medium includes a fluid environmental medium, so the environmental medium forms a fluid domain. The fluid domain is arranged around the battery cell and the heating module. In the actual baking process, the environmental medium will inevitably affect the temperature distribution of the battery cell. The present application considers the influence of the environmental medium and sets the corresponding fluid domain around the battery cell and the heating module for simulation, so that the simulation structure is more accurate.

[0049] In some possible implementation manners, the environmental medium further includes a solid environmental medium, for example, other components of the baking device including the heating module, or a heat dissipation module within the baking device, etc. Correspondingly, the solid environmental medium corresponds to a part of the solid domain. In actual application, other components around the battery cell will have certain influence on the heat distribution of the battery cell. By simulating the other components around the battery cell, the heat distribution of the battery cell in the baking process can be further accurately obtained, thereby guiding the design of the heating module.

[0050] In some possible implementation manners, the environmental medium can include one or more of air, insulating cooling liquid, protective gas, etc. The protective gas is a gas that is insulated from the battery cell, for example, inert gas, etc. Correspondingly, the fluid domain includes an air domain, an insulating cooling liquid domain, a protective gas domain, etc. In this embodiment, the environmental medium is air, and the environmental medium corresponds to the air domain, that is, the fluid domain includes the air domain. The air domain model is arranged in a cuboid around the battery cell and the heating module. In some possible implementation manners, the length and the width of the cuboid are independently selected from (2-7)×battery cell diameter, and the height of the cuboid is selected from (2-7)×battery cell height. This embodiment considers the influence of the air domain on the battery cell and the heating module within a certain range. If the length or the width of the air domain is set to be less than the battery cell diameter and the heating module is not wrapped, the baking in the simulation simulation will be inaccurate, which is not conducive to the analysis of the temperature. If the height of the air domain is less than the battery cell height, the same is true. If the length or the width of the air domain is set to be too large, the air domain model will be too large, and the air domain that is too large has less influence on the accuracy of the battery cell and the heating module.

[0051] Specifically, as shown in FIG. 2, step S100 includes the following steps:

[0052] Step S110, designing the heating module based on the battery cell;

[0053] Step S120, constructing corresponding solid models based on the battery cell and the designed heating module respectively.

[0054] The heating module can be designed on a two-dimensional drawing, and then a three-dimensional solid model is constructed according to the two-dimensional drawing, so as to facilitate the design and simulation construction of the heating module.

[0055] Alternatively, in other some implementation manners, as shown in FIG. 3, step S100 includes the following steps:

[0056] Step S101, constructing a solid model based on the battery cell;

[0057] Step S102, designing and constructing a solid model of the heating module based on the solid model of the battery cell.

[0058] In some possible embodiments, the three-dimensional model of the battery cell is constructed first, and then the three-dimensional model of the heating module is designed and constructed according to the three-dimensional model of the battery cell.

[0059] Then, step S200 is performed.

[0060] In step S200, the three-dimensional model is meshed, and the boundary conditions and initial conditions of the battery cell and the heating module are set, including the following steps.

[0061] As shown in FIG. 5, in step S210, the three-dimensional models of the battery cell, the heating module and the environmental medium are meshed.

[0062] When modeling the battery cell, the heating module and the environmental medium, the finite element analysis method can be used. The battery cell, the heating module and the environmental medium are divided into many small and simple elements, and then physical equations are applied to these elements to simulate the response of the object when subjected to external force or other external conditions, and thus the performance and behavior of the battery cell under different working conditions are predicted. The finite element analysis method can improve the accuracy of the simulation of the battery cell and the heating module.

[0063] The three-dimensional models corresponding to the battery cell, the heating module and the environmental medium are all meshed with polyhedral meshes.

[0064] Specifically, the three-dimensional models corresponding to the battery cell, the heating module and the environmental medium are all meshed with hexahedral meshes. In the finite element analysis, the hexahedral mesh has high robustness and high accuracy, but in other embodiments, other meshes such as tetrahedral meshes, pentahedral meshes, etc. can also be used, which are not limited here.

[0065] The size of the mesh can be set according to the requirements.

[0066] Specifically, the way of meshing can also be selected according to the specific requirements. For example, the three-dimensional model is meshed in regions, i.e. the polyhedral meshes are meshed based on the shape and structure of the solid domain and the fluid domain, as shown in FIG. 4, which is a structure diagram of meshing the three-dimensional model with polyhedral meshes based on the fluid domain in this step. In some possible embodiments, in the solid domain, the three-dimensional model corresponding to the battery cell can be meshed with polyhedral meshes based on the shape and structure of the whole battery cell. When the three-dimensional model of each component of the battery cell is constructed, the polyhedral meshes can be meshed based on the size of each component of the battery cell. The three-dimensional model corresponding to the heating module is meshed with polyhedral meshes based on its own shape, position and size, etc.

[0067] In step S220, the boundary conditions and initial conditions of the battery cell, the heating module and the environmental medium are set.

[0068] Specifically, the parameter conditions of the battery cell, the heating module and the environmental medium are set, and the boundary conditions and initial conditions of the solid model are input based on the parameter conditions.

[0069] The mechanical parameters and material parameters of the battery cell and the thermal parameters and material parameters of the heating module are obtained.

[0070] Specifically, the mechanical parameters of the battery cell include the direction and value of the gravity received by the battery cell. The material parameters of the battery cell include the density, specific heat capacity and thermal conductivity of the battery cell, etc. The material parameters of the battery cell can be the average density, average specific heat capacity and average thermal conductivity of the battery cell as a whole. Alternatively, material tests can be performed on each component inside the battery cell to obtain corresponding specific material parameters. The thermal parameter of the heating module refers to the heat emitted by a unit of the heating module. The material parameters of the heating module include the density, specific heat capacity and thermal conductivity of the heating module, etc.

[0071] The mechanical parameters and material parameters of the solid model of the battery cell and the thermal parameters and material parameters of the solid model of the heating module are input.

[0072] The boundary conditions of the battery cell and the heating module include the mechanical parameters and material parameters of the battery cell and the thermal parameters and material parameters of the heating module, etc.

[0073] In this step, the boundary conditions of the environmental medium also need to be input. In this embodiment, the environmental medium is air, and the boundary conditions of the environmental medium are the convective heat transfer coefficient and temperature of the air to form the heat dissipation parameters outside the battery cell.

[0074] In this step, physical equations, initial temperature and other initial conditions are also set. Specifically, the energy equation and flow state model of the fluid domain between the battery cell and the heating module are set, as well as the initial temperature of the battery cell, the heating module and the air domain, etc.

[0075] In some possible implementations, the flow state model of the fluid domain includes one of a laminar flow model and a turbulent flow model. By setting the parameters of the laminar flow model or the turbulent flow model of the fluid domain, the flow state of the fluid environmental medium can be simulated, so that the heat dissipation condition of the environmental medium flowing is simulated. In this embodiment, by setting the parameters of the laminar flow model or the turbulent flow model of the air domain, the air convection heat dissipation condition can be simulated, and the accuracy of the battery cell temperature analysis is further improved.

[0076] In some possible implementations, the initial temperature is set to room temperature, i.e. 26.85℃.

[0077] After the boundary conditions and initial conditions of the solid model are input, the solid model is initialized and set, so that the set boundary condition parameters are loaded into the corresponding components of the solid model.

[0078] In the embodiment of the present application, in step S300, the temperature change data of the battery cell is iteratively calculated based on the boundary conditions and the initial conditions. This includes steps such as starting simulation, equation solving calculation, result exporting and result post-processing. In some possible implementations, the simulation steps of steps S100, S200 and S300 in the present application are performed in the simulation software "Ansys Fluent", and the result post-processing step is performed using the "CFD-Post" tool in "Ansys Fluent". It should be noted that the three-dimensional model of the heating module is loaded on the three-dimensional model of the battery cell through the energy equation set in step S200, and the temperature change data of the battery cell is iteratively calculated through the energy equation.

[0079] The temperature change data of the battery cell includes a temperature distribution map. In the embodiment, the temperature distribution map of the battery cell includes a center cross-sectional temperature cloud map of the battery cell and a surface temperature cloud map of the battery cell. In this step, the center cross-sectional temperature cloud map of the battery cell can be analyzed, or the surface temperature cloud map of the battery cell can be analyzed, or both the center cross-sectional temperature cloud map and the surface temperature cloud map of the battery cell can be analyzed to improve the accuracy of the analysis. In some possible implementations, the temperature change data of the battery cell further includes a time-temperature change curve.

[0080] The application of the battery cell temperature analysis method provided in the embodiment of the present application is introduced below. In the following application scenarios, the battery cell 10 used is a cylindrical battery cell 10, specifically a lithium-ion cylindrical battery cell 10 of model 46950 produced by Eweison Lithium Energy.

[0081] In one application scenario, as shown in FIG. 6, in step S100, a three-dimensional model is established based on the battery cell 10, the heating module 20 and the environmental medium 30.

[0082] The diameter of the battery cell 10 is about 46 mm and the height is about 95 mm. The heating module 20 comprises a first sub-module 21, a second sub-module 22 and a third sub-module 23. The heating module 20 is combined by the first sub-module 21, the second sub-module 22 and the third sub-module 23 to perform baking heating on the battery cell 10. Each of the sub-modules is an annular structure with the same size, and is annularly arranged on the side of the battery cell 10 with a thickness of 2.5 mm. The first sub-module 21 is annularly arranged on the upper part of the battery cell 10, the second sub-module 22 is annularly arranged on the middle part of the battery cell 10, and the third sub-module 23 is annularly arranged on the lower part of the battery cell 10. The spacing between the first sub-module 21 and the second sub-module 22 and the spacing between the second sub-module 22 and the third sub-module 23 are equal. In the application, the height of each sub-module is less than 1 / 3 of the height of the battery cell. The environmental medium 30 is air. In the application, the length and width of the air domain are 3 times the diameter of the battery cell, and the height of the air domain is 2 times the height of the battery cell. That is, the length and width of the air domain are both 138 mm, and the height is 190 mm. In the six directions of the three-dimensional coordinate, the air domain protrudes the battery cell and the heating module by about 50 mm.

[0083] In step S200, the thermal parameters of the heating module 20 are that each sub-module emits 10000 W / m2of heat. The initial temperature of the battery cell, the heating module and the air domain is room temperature 26.85℃. 3

[0084] In step S300, as shown in FIG. 7 and FIG. 8, the center cross-section temperature cloud chart of the battery cell 10 and the surface temperature cloud chart of the battery cell 10 are obtained. From the center cross-section temperature cloud chart of the battery cell 10, the heating module designed in the application makes the difference between the highest point of the battery cell temperature and the lowest point of the battery cell temperature less than or equal to 0.002℃. From the surface temperature cloud chart of the battery cell 10, the difference between the highest point of the battery cell temperature and the lowest point of the battery cell temperature is less than or equal to 0.001℃. The heating module 20 designed in the application can provide a relatively uniform temperature distribution for the battery cell 10.

[0085] In another application scenario, as shown in FIG. 9, in step S100, a three-dimensional model is established based on the battery cell 10, the heating module 20 and the environmental medium 30.

[0086] ​The electric cell 10 is a cylindrical electric cell 10, specifically a cylindrical lithium-ion electric cell 10. The heating module 20 comprises a first sub-module 21 and a second sub-module 22. The heating module 20 is combined by the first sub-module 21 and the second sub-module 22 to perform baking heating on the electric cell 10. The first sub-module 21 is in a ring structure and is arranged around the side of the electric cell 10 with a thickness of 2.5 mm. The second sub-module 22 is in a circular structure and is arranged on the outside of the bottom surface of the electric cell 10 with a thickness of 2.5 mm. In some possible embodiments, the height of the first sub-module 21 is equal to the height of the electric cell 10, and the diameter of the second sub-module 22 is slightly larger than the diameter of the bottom surface of the electric cell 10. The environmental medium 30 is air. In this application, the length and width of the air domain are 3 times the diameter of the electric cell, and the height of the air domain is 2 times the height of the electric cell.

[0087] In step S200, the thermal parameters of the heating module 20 are that each sub-module emits 10000 W / m3 of heat. The initial temperature of the electric cell, the heating module, and the air domain is room temperature 26.85℃.

[0088] In step S300, as shown in FIGS. 10 and 11, the center cross-sectional temperature cloud chart of the electric cell 10 and the surface temperature cloud chart of the electric cell 10 are obtained. As shown in the center cross-sectional temperature cloud chart of the electric cell 10, the heating module designed in this application makes the difference between the highest temperature point and the lowest temperature point of the electric cell less than or equal to 0.005℃. As shown in the surface temperature cloud chart of the electric cell 10, the difference between the highest temperature point and the lowest temperature point of the electric cell is less than or equal to 0.005℃. In this application, the heating module 20 in this shape performs baking on the electric cell 10, so that the temperature of the bottom of the electric cell 10 is higher, and the temperature of the top of the electric cell 10 is lower.

[0089] In another application scenario, as shown in FIG. 12, in step S100, a three-dimensional model is established based on the electric cell 10, the heating module 20, and the environmental medium 30.

[0090] The electric cell 10 is a cylindrical electric cell 10, specifically a cylindrical lithium-ion electric cell 10. The heating module 20 is in a spiral structure and is arranged around the side of the electric cell 10 with a pitch of 10 mm. The cross section of the spiral structure is a circle with a radius of 2.5 mm. The total height of the heating module 20 is less than the height of the electric cell 10, and the radius of the spiral structure is slightly larger than the radius of the bottom surface of the electric cell 10. The radius of the spiral structure refers to the average radius of the spiral structure to the central axis when the spiral structure is arranged around the central axis. The environmental medium 30 is air. In this application, the length and width of the air domain are 3 times the diameter of the electric cell, and the height of the air domain is 2 times the height of the electric cell.

[0091] In step S200, the thermal parameters of the heating module 20 are that the heating module 20 emits 10000 W / m3 of heat. The initial temperature of the electric cell, the heating module, and the air domain is room temperature 26.85℃. 3 ​

[0092] In step S300, the center cross-section temperature cloud of the battery cell 10 and the surface temperature cloud of the battery cell 10 are obtained as shown in FIG. 13 and FIG. 14. From the center cross-section temperature cloud of the battery cell 10, the heating module designed in the present application makes the difference between the highest point of the battery cell temperature and the lowest point of the battery cell temperature less than or equal to 0.001℃. From the center cross-section temperature cloud of the battery cell 10, the heating module designed in the present application makes the difference between the highest point of the battery cell temperature and the lowest point of the battery cell temperature less than or equal to 0.001℃. The heating module 20 of this shape in the present application bakes the battery cell 10, and the uniformity of the battery cell 10 is good.

[0093] In another application scenario, as shown in FIG. 15, in step S100, a solid model is established based on the battery cell 10, the heating module 20 and the environmental medium 30.

[0094] The battery cell 10 is a cylindrical battery cell 10, specifically a cylindrical lithium ion battery cell 10. The heating module 20 includes a first sub-module 21 and a second sub-module 22. The heating module 20 is combined by the first sub-module 21 and the second sub-module 22 to bake and heat the battery cell 10. The first sub-module 21 is a connected ring-shaped structure and a circular structure, and the thicknesses are both 2.5mm. The ring-shaped structure of the first sub-module 21 is annularly arranged on the side surface of the battery cell 10 and located at the lower side surface of the battery cell 10, and the circular structure is correspondingly arranged on the bottom surface side of the battery cell 10, and the circular structure is connected to one side of the ring-shaped structure. The second sub-module 22 is a circular structure, and is correspondingly arranged on the top surface outside of the battery cell 10, and the thickness is 2.5mm. In some possible implementation manners, the height of the ring-shaped structure of the first sub-module 21 is less than the height of the battery cell 10, the diameter of the circular structure of the first sub-module 21 is slightly larger than the diameter of the bottom surface of the battery cell 10, and the diameter of the second sub-module 22 is slightly larger than the diameter of the bottom surface of the battery cell 10. The environmental medium 30 is air. In the present application, the length and width of the air domain are 3×battery diameter, and the height of the air domain is 2×battery height. In the six directions of the three-dimensional coordinate, the air domain is protruded from the battery cell and the heating module by about 50mm.

[0095] In step S200, the thermal parameters of the heating module 20 are that each sub-module emits 10000W / m 3 of heat. The initial temperature is room temperature 26.85℃.

[0096] In step S300, as shown in Figures 16 and 17, the temperature cloud map of the center section of the battery cell 10 and the temperature cloud map of the surface of the battery cell 10 are obtained. From the temperature cloud map of the center section of the battery cell 10, it can be seen that the heating module designed in this application makes the temperature difference between the highest and lowest points of the battery cell less than or equal to 0.008℃. As can be seen from the figures, the heating module 20 of this shape in this application bakes the battery cell 10, resulting in a higher temperature at the bottom of the battery cell 10 and a lower temperature at the top of the battery cell 10.

[0097] In another application scenario, as shown in Figure 18, in step S100, a three-dimensional model is constructed based on the battery cell 10, the heating module 20, and the environmental medium 30.

[0098] The battery cell 10 is a cylindrical battery cell 10, specifically a cylindrical lithium-ion battery cell 10. The heating module 20 includes a first sub-module 21 and a second sub-module 22. The heating module 20 is composed of the first sub-module 21 and the second sub-module 22 to heat the battery cell 10. The first sub-module 21 has a circular structure with a thickness of 2.5 mm. The circular structure of the first sub-module 21 is located on the bottom side of the battery cell 10. The second sub-module 22 has a circular structure and is located on the outer side of the top surface of the battery cell 10, with a thickness of 2.5 mm. In some possible embodiments, the diameter of the first sub-module 21 is slightly larger than the diameter of the bottom surface of the battery cell 10, and the diameter of the second sub-module 22 is slightly larger than the diameter of the bottom surface of the battery cell 10. The ambient medium 30 is air. In this application, the length and width of the air domain are 3 × the battery cell diameter, and the height of the air domain is 2 × the battery cell height.

[0099] In step S200, the thermal parameters of the heating module 20 are set so that each sub-module emits 10000W / m 3 The initial temperature of the battery cell, heating module, and air zone is room temperature, 26.85℃.

[0100] In step S300, as shown in Figures 19 and 20, the temperature cloud map of the center section of the battery cell 10 and the temperature cloud map of the surface of the battery cell 10 are obtained. From the temperature cloud map of the center section of the battery cell 10, it can be seen that the heating module designed in this application ensures that the temperature difference between the highest and lowest points of the battery cell is less than or equal to 0.003℃. From the temperature cloud map of the surface of the battery cell 10, it can also be seen that the temperature difference between the highest and lowest points of the battery cell is less than or equal to 0.003℃. As can be seen from the figures, the heating module 20 of this shape in this application bakes the battery cell 10, resulting in a higher temperature in the middle of the battery cell 10 and a lower temperature at the top and bottom of the battery cell 10.

[0101] Referring to FIG. 21, the application further provides an optimization design method of a heating module, including the temperature analysis method of the battery cell provided by the application. The heating module is used for baking the battery cell.

[0102] The step S300 further includes a step P100.

[0103] In the embodiment, as shown in FIG. 21, the step S300 further includes the step P100.

[0104] In the step P100, the temperature change data of the battery cell is obtained, and the solid model of the heating module is processed based on the temperature change data of the battery cell.

[0105] In some possible embodiments, the temperature change data of the battery cell includes a temperature change graph of the battery cell, and the temperature change graph includes a center cross-section temperature cloud image and a surface temperature cloud image.

[0106] In the temperature distribution graph, if the difference between the highest temperature point and the lowest temperature point is greater than or equal to a set temperature difference threshold, the shape, position and size of the solid model of the heating module are modified; if the difference between the highest temperature point and the lowest temperature point is less than the set temperature difference threshold, the shape parameter, position parameter and size parameter of the solid model of the heating module are output. It can be understood that by adjusting the parameters of the solid model of the heating module, the difference between the highest temperature point and the lowest temperature point of the battery cell in the baking process is less than the temperature difference threshold, and thus the finally optimized and designed heating module has higher uniformity in baking the battery cell in the baking process. In some possible embodiments, the temperature threshold set for the center cross-section temperature cloud image of the battery cell is 0.001 ℃ to 0.008 ℃, and specifically 0.001 ℃, 0.002 ℃, 0.003 ℃, 0.004 ℃, 0.005 ℃, 0.006 ℃, 0.007 ℃ or 0.008 ℃, etc. The temperature threshold set for the surface temperature cloud image of the battery cell is 0.001 ℃ to 0.008 ℃, and specifically 0.001 ℃, 0.002 ℃, 0.003 ℃, 0.004 ℃, 0.005 ℃, 0.006 ℃, 0.007 ℃ or 0.008 ℃, etc. It can be understood that the heating speed and degree of the center of the battery cell and the surface of the battery cell are different, and the temperature thresholds set for the temperature analysis of the center of the battery cell and the surface of the battery cell can be different.

[0107] Meanwhile, the solid model of the heating module is processed based on the center cross-section temperature cloud image of the battery cell and the surface temperature cloud image of the battery cell, which can improve the uniformity and accuracy of the heating module in baking the battery cell in the baking process.

[0108] In possible embodiments, the temperature change data of the battery cell includes a time-temperature change curve.

[0109] If the time length required for the temperature of the cell set point to rise to the set temperature is greater than or equal to the set time threshold, the shape, position, and size of the solid model of the heating module are modified; if the time length required for the temperature of the cell set point to rise to the set temperature is less than the set time threshold, the shape, position, and size parameters of the solid model of the heating module are output. It can be understood that by adjusting the parameters of the solid model of the heating module, the cell is rapidly heated in the baking process, and the efficiency of the finally designed heating module in baking the cell in the baking process is higher. For example, the set time threshold is 30 minutes (min). In some possible embodiments, the set time threshold can also be less than 30 min, for example, 20 min, 15 min, 10 min, 5 min, or 3 min, etc. The smaller the time threshold is set, the shorter the time of the heating module to bake the cell to the required temperature, and the higher the heating efficiency is. In the first application, the time length required for the temperature of the specific cell set point to rise to the set temperature is 10 min, which is much lower than the baking time required in the related art.

[0110] The baking efficiency and uniformity of the heating module on the cell can be analyzed by the simulation method, and optimizing the shape, position, size, and other parameter design of the heating module according to the simulation heating of the heating module on the cell is beneficial to improve the baking efficiency and uniformity of the heating module on the cell.

[0111] Please refer to FIG. 22, the present application also provides an electronic device system 100. The electronic device system 100 includes a processor 110, a memory 120, and a program stored on the memory, wherein the processor 110 executes the program to implement the steps in the temperature analysis method of the cell of the present application. For details, please refer to the method part of the embodiments of the present application, which will not be repeated here.

[0112] The above is the description of the temperature analysis method of the cell, the optimization design method of the heating module, and the electronic device system provided by the embodiments of the present application.

[0113] The temperature analysis method of the battery cell of the present application comprises constructing a three-dimensional model of the battery cell and the heating module, performing mesh division on the three-dimensional model, setting boundary conditions and initial conditions of the battery cell and the heating module respectively, and iteratively calculating the temperature change data of the battery cell based on the boundary conditions and the initial conditions. The temperature analysis of the process of baking the battery cell by different heating modules designed by the simulation method is beneficial to save manpower and material resources, the baking efficiency and the baking uniformity of the heating module on the battery cell can be analyzed by the simulation method, and the shape, position, size and other parameter design of the heating module can be optimized according to the simulation heating condition of the heating module on the battery cell. The embodiment of the present application provides an optimization design method of the heating module, which comprises the steps of the temperature analysis method of the battery cell provided by the embodiment of the present application, and further provides an electronic device system comprising a program and a processor capable of realizing the steps of the temperature analysis method of the battery cell provided by the embodiment of the present application, which has the beneficial effects of the embodiment of the present application.

Claims

1. A method for temperature analysis of a battery cell (10), comprising the following steps: Construct a three-dimensional model of the battery cell (10) and the heating module (20); The three-dimensional model is meshed, and the boundary conditions and initial conditions of the battery cell (10) and the heating module (20) are set respectively; Based on the boundary conditions and the initial conditions, the temperature change data of the battery cell (10) is calculated iteratively.

2. The temperature analysis method for the battery cell (10) according to claim 1, wherein, The steps for constructing the three-dimensional model of the battery cell (10) and the heating module (20) include: Construct a three-dimensional model of the battery cell (10), heating module (20) and environmental medium (30).

3. The temperature analysis method for the battery cell (10) according to claim 2, wherein, The environmental medium (30) includes a fluid domain.

4. The temperature analysis method for the battery cell (10) according to claim 3, wherein, The fluid domain includes the air domain.

5. The temperature analysis method for the battery cell (10) according to claim 4, wherein, The air domain surrounds the battery cell (10) and the heating module (20) and is arranged in a cuboid shape.

6. The temperature analysis method for the battery cell (10) according to claim 5, wherein, The length and width of the cuboid are independently selected from (2~7) × the diameter of the cell (10), and the height of the cuboid is selected from (2~7) × the height of the cell (10).

7. The temperature analysis method for the battery cell (10) according to any one of claims 3 to 6, wherein, The steps of meshing the three-dimensional model and setting the boundary conditions and initial conditions for the battery cell (10) and the heating module (20) include: The three-dimensional model is meshed, and the boundary conditions and initial conditions of the battery cell (10), the heating module (20) and the environmental medium (30) are set respectively.

8. The temperature analysis method for the battery cell (10) according to claim 7, wherein, The initial conditions of the fluid domain include either a laminar flow model or a turbulent flow model.

9. The temperature analysis method for the battery cell (10) according to claim 7, wherein, The boundary conditions of the fluid domain include the convective heat transfer coefficient, and the initial conditions of the fluid domain include the initial temperature of the fluid domain.

10. The temperature analysis method for the battery cell (10) according to claim 1, wherein, The boundary conditions of the battery cell (10) include the mechanical parameters and material parameters of the battery cell (10), and the initial conditions of the battery cell (10) include the initial temperature of the battery cell (10).

11. The temperature analysis method for the battery cell (10) according to claim 1, wherein, The boundary conditions of the heating module (20) include the thermal parameters and material parameters of the heating module (20), and the initial conditions of the heating module (20) include the initial temperature of the heating module (20).

12. The temperature analysis method for the battery cell (10) according to claim 1, wherein, The step of constructing a three-dimensional model of the battery cell (10) and the heating module (20) includes structural construction based on the shape, position and size of the heating module (20).

13. The temperature analysis method for the battery cell (10) according to claim 1, wherein, The battery cell (10) is a cylindrical battery cell.

14. The temperature analysis method for the battery cell (10) according to claim 1, wherein, The temperature change data includes a temperature distribution map.

15. The temperature analysis method for the battery cell (10) according to claim 14, wherein, The temperature distribution map includes a central section temperature cloud map and a surface temperature cloud map.

16. An optimization design method for a heating module, comprising a temperature analysis method for a battery cell (10) as described in any one of claims 1 to 15, wherein after the step of iteratively calculating the temperature change data of the battery cell (10) based on the boundary conditions and the initial conditions, the method further comprises: The temperature change data is obtained, and the three-dimensional model of the heating module (20) is processed based on the temperature change data.

17. An electronic device system (100) includes a processor (110) coupled to each other, a memory (120), and a program stored in the memory (120), wherein, The processor (110) executes the program to implement the steps in the temperature analysis method for the cell (10) as described in any one of claims 1 to 15.

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