Finite Element Modeling Method, Device, Storage Medium and Electronic Device for Soft Pack Battery Cells

Abstract

The present specification provides a finite element modeling method, device, storage medium, and electronic device for a soft-pack battery cell. The geometric model corresponding to the soft-pack battery cell includes a battery cell body and tabs. The method includes: determining a two-dimensional division plane of the geometric model according to the two-dimensional plane where at least one tab in the geometric model is located, and there is an overlapping portion between the tab region and the battery cell body region; respectively dividing corresponding two-dimensional meshes in the tab region and the battery cell body region, and the two-dimensional meshes divided on the overlapping portion of the tabs coincide with the two-dimensional meshes divided on the overlapping portion of the battery cell body; sweeping the two-dimensional meshes divided on the battery cell body region along the thickness direction of the battery cell body to divide three-dimensional meshes corresponding to the battery cell body; coupling the nodes corresponding to the two-dimensional meshes divided in the tab region and the nodes corresponding to the three-dimensional meshes to obtain a finite element model corresponding to the soft-pack battery cell.

Description

Technical Field

[0001] This specification relates to the technical field of lithium-ion batteries, and particularly to a finite element modeling method, device, storage medium, and electronic device for a soft-pack battery cell. Background Art

[0002] Compared with hard-shell lithium-ion batteries, soft-pack battery cells have the advantages of light weight, small internal resistance, long life, and strong plasticity, and have been widely used in the production of power batteries for new energy vehicles. However, during the use of soft-pack battery cells, due to their structural reasons, stress concentration occurs at the tab part. When the stress on the tab reaches a certain threshold, the tab will break, affecting the use safety of the soft-pack battery cell. Therefore, in order to ensure the use safety, finite element modeling can be performed on the soft-pack battery cell to analyze the stress condition at the tab part.

[0003] However, in the related art, three-dimensional modeling needs to be performed on the tab part, that is, corresponding three-dimensional meshes are divided at the tab part to achieve stress analysis. However, the above three-dimensional mesh modeling method will bring a large amount of calculation in the simulation analysis and has low efficiency. Summary of the Invention

[0004] To overcome the problems existing in the related art, this specification provides a finite element modeling method, device, storage medium, and electronic device for a soft-pack battery cell.

[0005] According to the first aspect of the embodiments of this specification, a finite element modeling method for a soft-pack battery cell is provided. The geometric model corresponding to the soft-pack battery cell includes a battery cell body and tabs. The method includes:

[0006] Determine a two-dimensional division plane of the geometric model according to the two-dimensional plane where at least one tab in the geometric model is located. The two-dimensional division plane includes a tab region and a battery cell body region. There is an overlapping part between the tab region and the battery cell body region. The tab region includes a tab independent part and a tab overlapping part. The battery cell body region includes a battery cell body independent part and a battery cell body overlapping part;

[0007] Respectively divide corresponding two-dimensional meshes in the tab region and the battery cell body region. The two-dimensional meshes divided on the tab overlapping part coincide with the two-dimensional meshes divided on the battery cell body overlapping part;

[0008] Sweep the two-dimensional meshes divided on the battery cell body region along the thickness direction of the battery cell body to divide the three-dimensional meshes corresponding to the battery cell body;

[0009] Couple the nodes corresponding to the two-dimensional meshes divided in the tab region and the nodes corresponding to the three-dimensional meshes to obtain the finite element model corresponding to the soft-pack battery cell.

[0010] According to the second aspect of the embodiments of the present specification, a finite element modeling device for a soft-pack battery cell is provided. The geometric model corresponding to the soft-pack battery cell includes a battery cell body and tabs. The device includes:

[0011] A determination unit, configured to determine a two-dimensional division plane of the geometric model according to a two-dimensional plane where at least one tab in the geometric model is located. The two-dimensional division plane includes a tab region and a battery cell body region. There is an overlapping part between the tab region and the battery cell body region. The tab region includes a tab independent part and a tab overlapping part. The battery cell body region includes a battery cell body independent part and a battery cell body overlapping part;

[0012] A division unit, configured to divide corresponding two-dimensional meshes in the tab region and the battery cell body region respectively. The two-dimensional meshes divided on the tab overlapping part coincide with the two-dimensional meshes divided on the battery cell body overlapping part;

[0013] A sweeping unit, configured to sweep the two-dimensional meshes divided on the battery cell body region along the thickness direction of the battery cell body to divide three-dimensional meshes corresponding to the battery cell body;

[0014] A coupling unit, configured to couple the nodes corresponding to the two-dimensional meshes divided in the tab region and the nodes corresponding to the three-dimensional meshes to obtain a finite element model corresponding to the soft-pack battery cell.

[0015] According to the third aspect of the embodiments of the present specification, an electronic device is provided, including:

[0016] A processor; a memory for storing instructions executable by the processor; wherein, the processor is configured to implement the steps of the method described in the first aspect above.

[0017] According to the fourth aspect of the embodiments of the present specification, a computer-readable storage medium is provided, on which executable instructions are stored; wherein, when the instructions are executed by a processor, the steps of the method described in the first aspect above are implemented.

[0018] The technical solutions provided by the embodiments of the present specification may include the following beneficial effects:

[0019] In the embodiments of the present specification, a corresponding two-dimensional finite element model can be established based on the geometric model of the tab, thereby effectively reducing the amount of calculation in the simulation analysis and improving the efficiency of the simulation analysis. At the same time, by performing a coupling operation on the nodes corresponding to the two-dimensional meshes divided in the tab region and the nodes corresponding to the three-dimensional meshes, the three-dimensional meshes corresponding to the battery cell body can receive the simulation data transmitted by the two-dimensional meshes corresponding to the tab, ensuring the accuracy of the simulation results.

[0020] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this specification. Brief Description of the Drawings

[0021] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this specification, and are used together with the specification to explain the principles of this specification.

[0022] Figure 1 is a flowchart of a method for modeling a soft-pack battery cell provided by an exemplary embodiment of this specification;

[0023] Figure 2 is a schematic diagram of a geometric model provided by an exemplary embodiment of this specification;

[0024] Figure 3 is a schematic diagram of the tab distribution provided by an exemplary embodiment of this specification;

[0025] Figure 4 is a schematic diagram of how to determine a two-dimensional segmentation plane provided by an exemplary embodiment of this specification;

[0026] Figure 5 is a schematic diagram of a two-dimensional segmentation plane provided by an exemplary embodiment of this specification;

[0027] Figure 6 is a schematic diagram of grid coincidence provided by an exemplary embodiment of this specification;

[0028] Figure 7 is a schematic diagram of grid nodes provided by an exemplary embodiment of this specification;

[0029] Figure 8 is a schematic diagram of another two-dimensional grid division provided by an exemplary embodiment of this specification;

[0030] Figure 9 is a schematic diagram of the tab height difference provided by an exemplary embodiment of this specification;

[0031] Figure 10 is a schematic diagram of the preprocessing of a two-dimensional segmentation plane provided by an exemplary embodiment of this specification;

[0032] Figure 11 is a schematic diagram of a three-dimensional grid provided by an exemplary embodiment of this specification;

[0033] Figure 12 is a schematic structural diagram of an electronic device provided by an exemplary embodiment of this specification;

[0034] Figure 13It is a block diagram of a finite element modeling device for a soft-pack battery cell provided by an exemplary embodiment of this specification. Detailed implementation manners

[0035] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with one or more embodiments of this specification. On the contrary, they are only examples of devices and methods consistent with some aspects of one or more embodiments of this specification.

[0036] It should be noted that: in other embodiments, the steps of the corresponding methods are not necessarily executed in the order shown and described in this specification. In some other embodiments, the steps included in the method may be more or less than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; and multiple steps described in this specification may also be combined into a single step for description in other embodiments. It should be understood that although terms such as first, second, and third may be used in this specification to describe various information, the information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this specification, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0037] Finite element analysis is an analysis method that uses the concept of mathematical approximation to simulate a real physical system. Thus, with simple and interacting elements (i.e., units), a real physical system with an infinite number of unknowns can be approximated with a finite number of unknowns. To implement finite element analysis, the geometric model corresponding to the real object must be meshed to form the finite element model required for finite element analysis. Meshing involves the shape of the elements, the topological type, the element type, the mesh density, etc. In the related art, for the establishment of the finite element model of a soft-pack battery cell, a corresponding three-dimensional mesh needs to be divided for the geometric model of the tab, that is, a corresponding three-dimensional mesh is divided for both the cell body and the tab in the soft-pack battery cell, and this three-dimensional mesh is used as the finite element model to perform a stress analysis.

[0038] However, the above finite element modeling method will generate a large amount of computational workload in the simulation analysis, affecting the efficiency of the simulation. At the same time, the three-dimensional modeling method for the tab is also relatively cumbersome.

[0039] Therefore, to solve the above problems, this specification proposes an improved finite element modeling method for soft-pack battery cells, which will be described in detail below in conjunction with embodiments.

[0040] Figure 1 FIG. is a flowchart of a modeling method for a soft-pack battery cell provided by an exemplary embodiment of this specification. The geometric model corresponding to this soft-pack battery cell includes a battery cell body and tabs, and may include the following steps:

[0041] Step 102: Determine the two-dimensional division plane of the geometric model according to the two-dimensional plane where at least one tab in the geometric model is located. The two-dimensional division plane includes a tab region and a battery cell body region. There is an overlapping part between the tab region and the battery cell body region. The tab region includes a tab independent part and a tab overlapping part, and the battery cell body region includes a battery cell body independent part and a battery cell body overlapping part.

[0042] The geometric model described in this specification can be designed based on a physical object, so the geometric model can also be called a design model. As Figure 2 shown, Figure 2 FIG. is a schematic diagram of a geometric model provided by an exemplary embodiment of this specification. This geometric model may include a battery cell body 201, a tab 202, and a tab 203. Among them, the tab 202 may be a positive tab, and the tab 203 may be a negative tab. The design dimensions of this soft-pack battery cell may specifically be: for the battery cell body: 550 mm × 100 mm × 10 mm, and for the tabs: 25 mm × 40 mm × 0.4 mm. Of course, the specific dimensions of the soft-pack battery cell are only exemplary and can be dynamically adjusted according to design requirements, and this specification does not limit this.

[0043] It should be noted that although in the Figure 2 shown embodiment, the tabs 202 and 203 are distributed at both ends of the battery cell body and are aligned in the vertical direction (i.e., there is no height difference), in some embodiments, the tabs 202 and 203 may be distributed at the same end of the battery cell body, as Figure 3 shown, Figure 3 FIG. is a schematic diagram of tab distribution provided by an exemplary embodiment of this specification. Of course, assuming that the tabs 202 and 203 are distributed at the same end of the battery cell body, they may still be aligned in the vertical direction (i.e., there is no height difference), or there may be a height difference. In other words, according to actual needs, the tabs can be designed in different regions of the battery cell body, and this specification does not limit this.

[0044] As Figure 2As shown, the tab 202 (25mm×40mm×0.4mm) is a three-dimensional structure, while the finite element model of the tab in this specification is two-dimensional modeling. Therefore, it is necessary to extract the mid-plane of the tab, or rather, determine the two-dimensional plane of the tab, so as to make two-dimensional modeling possible. In one embodiment, the two-dimensional plane can divide the tab into two parts in the thickness direction, and the two parts are symmetric about the two-dimensional plane mirror. For example, if the thickness of the tab is 0.4mm, then the two-dimensional plane can be determined at 0.2mm at this time. The two-dimensional plane evenly divides the tab in the thickness direction, making the two divided parts symmetric about the two-dimensional plane mirror. Of course, the two-dimensional plane can also divide the tab proportionally, for example, one to three, etc. This specification does not limit this.

[0045] After determining the two-dimensional plane where the tab is located, the two-dimensional division plane of the geometric model can be determined according to this two-dimensional plane. Assuming that the tab is evenly divided at 0.2mm as described above, the schematic diagram of how to determine the two-dimensional division plane can be obtained as Figure 4 shown. Because a part of the tab described in this specification extends into the interior of the battery cell body, actually, the two-dimensional division plane can be specifically as Figure 5 shown, Figure 5 is a schematic diagram of a two-dimensional division plane provided by an exemplary embodiment of this specification. Among them, the two-dimensional division plane can include the tab area and the battery cell body area. Because a part of the tab extends into the interior of the battery cell body, there is an overlapping part (i.e., Figure 5 the black area) between the tab area and the battery cell body area. Then, based on the above, it can be considered that the tab area includes the tab independent part and the tab overlapping part, and the battery cell body area includes the battery cell body overlapping part and the battery cell body independent part. In the top view, the battery cell body overlapping part and the tab overlapping part can be considered to overlap visually.

[0046] Step 104: Divide corresponding two-dimensional grids in the tab area and the battery cell body area respectively, and the two-dimensional grids divided on the tab overlapping part coincide with the two-dimensional grids divided on the battery cell body overlapping part.

[0047] After determining the two-dimensional division plane as described above, two-dimensional grids can be divided on the tab area and the battery cell body area respectively. Among them, the two-dimensional grids divided on the tab overlapping part coincide with the grids divided on the battery cell body overlapping part. The reason for making the two-dimensional grids divided on the tab overlapping part coincide with the grids divided on the battery cell body overlapping part is that the simulation data of the two-dimensional grids at the tab needs to be transmitted to the battery cell body, otherwise the accuracy of the simulation results cannot be guaranteed. As Figure 6 shown, Figure 6 is a schematic diagram of grid coincidence provided by an exemplary embodiment of this specification. In order to distinguish and display the tab overlapping part and the tab independent part, Figure 6It is represented by a relatively thick grid in the figure. However, during actual simulation, the thickness of the grid in the tab overlap part is the same as that in the tab independent part, and the thickness of the grid in the overlap part of the cell body is also the same as that in the independent part of the cell body.

[0048] It should be emphasized that although in Figure 6 the illustrated embodiment, the part where the tab extends into the cell body (i.e., the tab overlap part) has only one row of grids. However, in some embodiments, the part where the tab extends into the cell body can be divided into multiple rows of grids, such as 2 rows, 4 rows, etc. In other words, the size of the grids can be determined according to actual needs as long as they overlap. This specification does not limit this.

[0049] As described above, the grids divided on the tab overlap part and the overlap part of the cell body in this specification overlap. The purpose is to transfer the simulation data at the tab to the cell body. For the specific principle, please refer to Figure 7 , Figure 7 which is a schematic diagram of grid nodes provided by an exemplary embodiment of this specification. Based on Figure 7 this, it can be understood that each node of the grid in the tab overlap part (node A, node B, node C, node D, node E, node F, node G, node H, and node I) needs to overlap with the corresponding node of the grid in the cell body. Then, through the coupling operation, 2 nodes (i.e., the node corresponding to the tab overlap part and the node corresponding to the cell body) are coupled into 1 node, thereby realizing the transfer of data.

[0050] Based on the above principle, it is not difficult to find that actually, the size of the grid in the independent part of the cell body does not necessarily need to be the same as Figure 6 that shown in Figure 7 as long as it is ensured that each node shown in Figure 8 overlaps with the grid nodes in the independent part of the cell body. In view of this, in order to avoid dividing a large number of grids and increasing the calculation amount, this specification proposes another way of dividing grids. Please refer to Figure 8 which is a schematic diagram of another two-dimensional grid division provided by an exemplary embodiment of this specification. In this embodiment, the overlap part of the cell body is located in at least one row of partial areas of the two-dimensional grids at one end of the cell body, and the grid size of the remaining areas corresponding to the at least one row of the two-dimensional grids is the same as the grid size of the two-dimensional grids divided in the tab area. From Figure 8It can be seen that as long as the two-dimensional grids in at least one row of the remaining area corresponding to the two-dimensional grid are the same size as the two-dimensional grids divided in the tab region, the coincidence of the nodes can be ensured. By controlling the size of the two-dimensional grids in the remaining area, the transmission of simulation data can be ensured, so that the rotational degrees of freedom of the two-dimensional grids in the tab region can be transmitted to the cell body. Thus, the grids of the cell body can be divided into larger sizes, the number of grids of the cell body is reduced, the simulation operation amount is also reduced, and the efficiency of the simulation analysis is accelerated.

[0051] In one embodiment, when there is a height difference between the two tabs corresponding to the soft-pack cell in the vertical direction, the two-dimensional division plane corresponding to any one of the tabs in the geometric model can be determined according to the two-dimensional plane where any one of the tabs is located in the geometric model; preprocess the determined two-dimensional division plane so that the determined two-dimensional division plane includes the overlapping part of the cell body corresponding to the first tab and the overlapping part of the cell body corresponding to the second tab; or, when there is a height difference between the two tabs corresponding to the soft-pack cell in the vertical direction, the two-dimensional division planes corresponding to the two tabs in the geometric model can be determined respectively, and two-dimensional grids corresponding to the cell body region are respectively divided on the two two-dimensional division planes, and the two-dimensional grids divided on the cell body region are swept along the thickness direction of the cell body to divide two three-dimensional grids corresponding to the cell body, and the two three-dimensional grids are coupled to obtain the three-dimensional grid corresponding to the cell body. For example, as described above, the positive and negative tabs, that is, the first tab and the second tab, may have a height difference in the vertical direction due to design requirements (as Figure 9 shown), then at this time, the two-dimensional grids can be divided in the following two ways: select any two-dimensional plane and determine the corresponding two-dimensional division plane. As Figure 10 shown, at this time, the two-dimensional division plane can be preprocessed, that is, the two-dimensional grids of the tab overlapping part corresponding to the other tab are divided in this two-dimensional division plane, that is, both ends of this two-dimensional division plane include a row of grids with the same size as the tab grids. Or, the two-dimensional division planes corresponding to the two tabs in the geometric model are determined respectively, and two-dimensional grids corresponding to the cell body region are respectively divided on the two two-dimensional division planes. That is, the top end of the first two-dimensional division plane includes a row of two-dimensional grids with the same size as the tab grids, and the bottom end of the second two-dimensional division plane includes a row of two-dimensional grids with the same size as the tab grids. Then, the two-dimensional grids divided on the cell body region are swept along the thickness direction of the cell body to divide two three-dimensional grids corresponding to the cell body, and the two three-dimensional grids are coupled to obtain the three-dimensional grid corresponding to the cell body.

[0052] In one embodiment, different virtual components can be obtained, and the virtual components are respectively defined with attributes corresponding to the tab and the cell body; the two-dimensional grid divided in the tab region and the two-dimensional grid divided in the cell body region are moved into the corresponding virtual components to apply the attributes defined by the virtual components. For example, different material parameters can be defined for the virtual components. For example, the positive tab can use aluminum material, and the corresponding virtual component can be defined as aluminum material; the negative tab can use nickel material, and the corresponding virtual component can be defined as nickel material; while the cell body can use aluminum-plastic film material, and the corresponding virtual component can be defined as aluminum-plastic film material, etc. Since the materials of the tab and the cell body are often different, they need to be moved into different virtual components, so that different attributes can be applied.

[0053] Step 106: Sweep the two-dimensional grid divided on the cell body region along the thickness direction of the cell body to divide the three-dimensional grid corresponding to the cell body.

[0054] After dividing the two-dimensional grid on the cell body region, the two-dimensional grid can be swept along the thickness direction of the cell body to divide the three-dimensional grid corresponding to the cell body. The specific sweeping distance can be based on the thickness design parameter. For example, if the thickness of the cell body is 10 mm, the sweeping distance can be controlled at 10 mm, so as to ensure that the obtained three-dimensional grid is consistent with the design parameters of the soft-pack cell. As Figure 11 shown, Figure 11 is a schematic diagram of a three-dimensional grid provided by an exemplary embodiment of this specification. It can be seen from Figure 11 that after sweeping the original two-dimensional grid upward by 2 rows and downward by 2 rows respectively, the three-dimensional grid corresponding to the cell body as shown in Figure 11 can be obtained.

[0055] Step 108: Couple the nodes corresponding to the two-dimensional grid divided in the tab region and the nodes corresponding to the three-dimensional grid to obtain the finite element model corresponding to the soft-pack cell.

[0056] In one embodiment, in the case of dividing the three-dimensional grid corresponding to the cell body, the function of the two-dimensional grid divided in the cell body region at this time has been completed, and there is no need to retain the two-dimensional grid. Therefore, the two-dimensional grid divided in the cell body region can be deleted.

[0057] The coupling operation refers to merging the nodes of two overlapping meshes into one node. In fact, although the nodes of the mesh at the overlap of the tab and the mesh at the overlap of the battery cell body visually coincide, they are two independent nodes. If the coupling is not performed, the model may be separated during the simulation process, that is, the tab is separated from the battery cell body. Therefore, at this time, a coupling operation needs to be performed on the nodes to ensure the normal progress of the simulation. After coupling, the simulation data of the tab can be transmitted to the battery cell body, thus ensuring the accuracy of the simulation results.

[0058] As the power battery of a new energy vehicle, it is not composed of a single soft-pack battery cell, but multiple soft-pack battery cells are combined into a module and further combined into a battery pack, and this battery pack is used as the power battery. Therefore, the finite element model of the soft-pack battery cell described in this specification can not only perform the stress analysis of a single soft-pack battery cell, but also combine multiple soft-pack battery cells into a finite element model of the battery pack to perform the stress analysis of the battery pack. Of course, the battery pack can also include corresponding BDU (Battery Disconnect Unit) modules, etc., so that when performing simulation analysis on the battery pack, the stress conditions of the corresponding tabs can still be obtained.

[0059] Based on the above embodiments, this specification can establish a corresponding two-dimensional finite element model based on the geometric model of the tab, thereby effectively reducing the calculation amount in the simulation analysis and improving the efficiency of the simulation analysis. At the same time, by performing a coupling operation on the nodes corresponding to the two-dimensional mesh and the nodes corresponding to the three-dimensional mesh in the tab area, the three-dimensional mesh corresponding to the battery cell body can receive the simulation data transmitted by the two-dimensional mesh corresponding to the tab, ensuring the accuracy rate of the simulation results.

[0060] Corresponding to the embodiments of the foregoing method, this specification also provides embodiments of a device, an electronic device, and a storage medium.

[0061] Figure 12 is a schematic structural diagram of an electronic device provided by an exemplary embodiment. Please refer to Figure 12 , at the hardware level, this device includes a processor 1201, a network interface 1202, a memory 1203, a non-volatile memory 1204, and an internal bus 1205. Of course, it may also include other hardware required for other services. One or more embodiments of this specification can be implemented in a software manner. For example, the processor 1201 reads the corresponding computer program from the non-volatile memory 1204 into the memory 1203 and then runs it. Of course, in addition to the software implementation manner, one or more embodiments of this specification do not exclude other implementation manners, such as logic devices or a combination of software and hardware. That is to say, the execution subject of the following processing flow is not limited to each logic unit, and can also be hardware or a logic device.

[0062] Figure 13

[0062] is a block diagram of a finite element modeling device for a soft-pack battery cell provided by an exemplary embodiment. The geometric model corresponding to the soft-pack battery cell includes a battery cell body and tabs. The device includes:

[0063] A determination unit 1302, configured to determine a two-dimensional division plane of the geometric model according to a two-dimensional plane where at least one tab in the geometric model is located. The two-dimensional division plane includes a tab region and a battery cell body region. There is an overlapping portion between the tab region and the battery cell body region. The tab region includes a tab independent portion and a tab overlapping portion. The battery cell body region includes a battery cell body independent portion and a battery cell body overlapping portion;

[0064] A division unit 1304, configured to divide corresponding two-dimensional meshes in the tab region and the battery cell body region respectively. The two-dimensional meshes divided on the tab overlapping portion coincide with the two-dimensional meshes divided on the battery cell body overlapping portion;

[0065] A sweeping unit 1306, configured to sweep the two-dimensional meshes divided on the battery cell body region along the thickness direction of the battery cell body to divide three-dimensional meshes corresponding to the battery cell body;

[0066] A coupling unit 1308, configured to couple the nodes corresponding to the two-dimensional meshes divided in the tab region and the nodes corresponding to the three-dimensional meshes to obtain a finite element model corresponding to the soft-pack battery cell.

[0067] Optionally, the two-dimensional plane cuts the tab into two parts in the thickness direction, and the two parts are symmetric about the two-dimensional plane mirror.

[0068] Optionally, the battery cell body overlapping portion is located in a partial region of at least one row of the two-dimensional meshes at one end of the battery cell body. The grid sizes of the two-dimensional meshes corresponding to the remaining regions of the at least one row of the two-dimensional meshes are the same as the grid sizes of the two-dimensional meshes divided in the tab region.

[0069] Optionally, the device further includes:

[0070] A preprocessing unit 1310 is configured to, when there is a height difference between two tabs of the soft-pack battery cell in the vertical direction, determine a two-dimensional segmentation plane corresponding to any tab in the geometric model according to the two-dimensional plane where any tab is located in the geometric model; preprocess the determined two-dimensional segmentation plane so that the determined two-dimensional segmentation plane includes the overlapping part of the battery cell body corresponding to the first tab and the overlapping part of the battery cell body corresponding to the second tab; or, when there is a height difference between two tabs of the soft-pack battery cell in the vertical direction, respectively determine the two-dimensional segmentation planes corresponding to the two tabs in the geometric model, and divide two-dimensional grids corresponding to the battery cell body area on the two two-dimensional segmentation planes, sweep the two-dimensional grids divided on the battery cell body area in the thickness direction of the battery cell body to divide two three-dimensional grids corresponding to the battery cell body, and perform a coupling operation on the two three-dimensional grids to obtain a three-dimensional grid corresponding to the battery cell body.

[0071] Optionally, the device further includes:

[0072] A virtual component unit 1312 is configured to obtain different virtual components, where the virtual components are respectively defined with attributes corresponding to the tab and the battery cell body; move the two-dimensional grids divided in the tab area and the two-dimensional grids divided in the battery cell body area into the corresponding virtual components to apply the attributes defined by the virtual components.

[0073] Optionally, the device further includes:

[0074] A deletion unit 1314 is configured to, when the three-dimensional grid corresponding to the battery cell body is divided, delete the two-dimensional grids divided in the battery cell body area.

[0075] Optionally, the device further includes:

[0076] A combination unit 1316 is configured to combine a plurality of finite element models of the soft-pack battery cells into a corresponding finite element model of the battery pack.

[0077] Based on the above finite element modeling device for the soft-pack battery cell, a corresponding two-dimensional finite element model can be established based on the geometric model of the tab, thereby effectively reducing the calculation amount in the simulation analysis and improving the efficiency of the simulation analysis. At the same time, by performing a coupling operation on the nodes corresponding to the two-dimensional grids in the tab area and the nodes corresponding to the three-dimensional grids, the three-dimensional grid corresponding to the battery cell body can receive the simulation data transmitted by the two-dimensional grid corresponding to the tab, ensuring the accuracy rate of the simulation result.

[0078] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the descriptions of the method embodiments. The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution in this specification. A person of ordinary skill in the art can understand and implement it without creative efforts.

[0079] In a typical configuration, a computer device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0080] The memory may include non-permanent memory in the computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0081] The computer-readable medium includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0082] It should also be noted that the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, the element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, commodity or device comprising the element.

[0083] Exemplary embodiments will be described in detail herein, and examples thereof are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. On the contrary, they are merely examples of devices and methods consistent with some aspects of this specification as detailed in the appended claims.

[0084] The terms used in this specification are for the purpose of describing particular embodiments only and are not intended to limit this specification. The singular forms "a", "the", and "said" used in this specification and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0085] It should be understood that although the terms first, second, third, etc. may be used in this specification to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this specification, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0086] The above are only the preferred embodiments of this specification and are not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification shall be included within the scope of protection of this specification.

Claims

1. A finite element modeling method for a soft-pack battery cell, characterized in that, The geometric model corresponding to the soft-pack battery cell includes a battery cell body and tabs, and the method includes: Determine a two-dimensional division plane of the geometric model according to the two-dimensional plane where at least one tab in the geometric model is located. The two-dimensional division plane includes a tab area and a battery cell body area. There is an overlapping part between the tab area and the battery cell body area. The tab area includes a tab independent part and a tab overlapping part, and the battery cell body area includes a battery cell body independent part and a battery cell body overlapping part; Respectively divide corresponding two-dimensional meshes in the tab area and the battery cell body area. The two-dimensional meshes divided on the tab overlapping part coincide with the two-dimensional meshes divided on the battery cell body overlapping part; Sweep the two-dimensional meshes divided on the battery cell body area in the thickness direction of the battery cell body to divide three-dimensional meshes corresponding to the battery cell body; Couple the nodes corresponding to the two-dimensional meshes divided in the tab area and the nodes corresponding to the three-dimensional meshes to obtain a finite element model corresponding to the soft-pack battery cell.

2. The method according to claim 1, wherein The two-dimensional plane cuts the tab into two parts in the thickness direction, and the two parts are symmetric about the two-dimensional plane mirror.

3. The method according to claim 1, characterized in that, The battery cell body overlapping part is located in a partial area of at least one row of the two-dimensional meshes at one end of the battery cell body. The grid sizes of the two-dimensional meshes in the remaining areas corresponding to the at least one row of the two-dimensional meshes are the same as the grid sizes of the two-dimensional meshes divided in the tab area.

4. The method according to claim 1, wherein The method further includes: In the case where there is a height difference between the two tabs corresponding to the soft-pack battery cell in the vertical direction, determine a two-dimensional division plane corresponding to any tab in the geometric model according to the two-dimensional plane where any tab in the geometric model is located; Preprocess the determined two-dimensional division plane so that the determined two-dimensional division plane includes the battery cell body overlapping part corresponding to the first tab and the battery cell body overlapping part corresponding to the second tab; or, In the case where there is a height difference between the two tabs corresponding to the soft-pack battery cell in the vertical direction, respectively determine the two-dimensional division planes corresponding to the two tabs in the geometric model, and respectively divide the two-dimensional meshes corresponding to the battery cell body area on the two two-dimensional division planes. Sweep the two-dimensional meshes divided on the battery cell body area in the thickness direction of the battery cell body to divide two three-dimensional meshes corresponding to the battery cell body, and perform a coupling operation on the two three-dimensional meshes to obtain the three-dimensional meshes corresponding to the battery cell body.

5. The method according to claim 1, wherein The method further includes: Obtain different virtual components, and the virtual components are respectively defined with attributes corresponding to the tabs and the battery cell body; Move the two-dimensional meshes divided in the tab area and the two-dimensional meshes divided in the battery cell body area into the corresponding virtual components to apply the attributes defined by the virtual components.

6. The method according to claim 1, wherein The method further includes: In the case where the three-dimensional meshes corresponding to the battery cell body are divided, delete the two-dimensional meshes divided in the battery cell body area.

7. The method according to claim 1, wherein The method further includes: Combine multiple finite element models of the soft-pack battery cells into a corresponding finite element model of the battery pack.

8. A finite element modeling device for a soft-pack battery cell, characterized in that The geometric model corresponding to the soft-pack battery cell includes a battery cell body and tabs, and the device includes: A determination unit, configured to determine a two-dimensional segmentation plane of the geometric model according to a two-dimensional plane where at least one tab in the geometric model is located, the two-dimensional segmentation plane includes a tab region and a battery cell body region, there is an overlapping portion between the tab region and the battery cell body region, the tab region includes a tab independent portion and a tab overlapping portion, and the battery cell body region includes a battery cell body independent portion and a battery cell body overlapping portion; A division unit, configured to divide corresponding two-dimensional meshes in the tab region and the battery cell body region respectively, and the two-dimensional meshes divided on the tab overlapping portion coincide with the two-dimensional meshes divided on the battery cell body overlapping portion; A sweeping unit, configured to sweep the two-dimensional meshes divided on the battery cell body region along the thickness direction of the battery cell body to divide three-dimensional meshes corresponding to the battery cell body; A coupling unit, configured to couple the nodes corresponding to the two-dimensional meshes divided in the tab region and the nodes corresponding to the three-dimensional meshes to obtain a finite element model corresponding to the soft-pack battery cell.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

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