Finite element analysis method, device and equipment of battery pack, medium and product

Abstract

The invention relates to the technical field of electronics, and discloses a finite element analysis method, device and equipment of a battery pack, a medium and a product. According to the method, a first finite element mesh model of a plurality of aerogel heat insulation pads is constructed, and the first finite element mesh model comprises an aerogel main body mesh and a silica gel sheet rubber frame mesh; setting elastic modulus values corresponding to the silica gel sheet rubber frame under different strains in silica gel sheet rubber frame grids of the first finite element grid models to obtain a plurality of second finite element grid models of the aerogel heat insulation pad, and assembling the plurality of second finite element grid models between adjacent single battery grids of the target grid model to obtain the aerogel heat insulation pad. Obtaining a third finite element mesh model of the battery pack; and simulating the third finite element mesh model to obtain deformation and stress distribution conditions of each second finite element mesh under the target working condition, thereby analyzing whether the battery pack has a damage risk under the target working condition, and enabling a battery working condition analysis calculation result to be more accurate and comprehensive.

Description

Technical Field

[0001] The present invention relates to the field of electronic technologies, and particularly to a finite element analysis method, device, equipment, medium and product for a battery pack. Background Art

[0002] During the design process of a battery pack, adding an aerogel thermal insulation pad between single cells is a conventional means for cell thermal insulation and also serves to fill the expansion gap between cells. The structure of the aerogel thermal insulation pad is as follows: the main material in the middle is aerogel, and the outer edge is a silica gel sheet rubber frame. The aerogel and the silica gel sheet rubber frame are encapsulated by transparent PET. In order to analyze whether there is a risk of structural damage to the battery pack under different working conditions, it is necessary to perform finite element modeling on the battery pack to obtain a simulation model and analyze the mechanical properties of the simulation model under various working conditions.

[0003] According to the stress and strain result data obtained after the compression test of the aerogel, it can be determined that the aerogel is easily compressed and deformed in the early stage of compression, but it becomes increasingly difficult to compress in the later stage of compression until it basically no longer deforms, that is, it is very difficult to compress further. In other words, the elastic properties of the aerogel main body change continuously with the degree of deformation. Moreover, the elastic properties of the silica gel sheet rubber frame of the aerogel thermal insulation pad are different from those of the aerogel main body part. If the deformation and force-bearing conditions of the aerogel thermal insulation pad under different working conditions are considered in the simulation analysis, the simulation analysis process will be relatively complex. Therefore, in order to simplify the simulation process, in the related art, when performing finite element simulation analysis on the battery pack, generally the aerogel thermal insulation pad is not modeled, and the deformation and force-bearing conditions of the aerogel thermal insulation pad under different working conditions are not considered. Only the force-bearing and deformation conditions of the end plates and straps in the battery pack under different working conditions are simulated and analyzed to determine whether there is a risk of damage to the battery pack. However, when the battery pack is under working conditions such as extrusion, expansion, and dropping, if the pressure received by the aerogel thermal insulation pad exceeds its bearing capacity, there is also a risk of damage to the aerogel thermal insulation pad. If the deformation and force-bearing conditions of the aerogel thermal insulation pad are not considered in the simulation analysis of the battery pack, it will lead to an incomplete simulation result and cannot well analyze the structural risk of the battery pack under different working conditions. Summary of the Invention

[0004] In view of this, the present invention provides a finite element analysis method, device, equipment, medium and product for a battery pack to solve the problem that in the simulation analysis of the battery pack in the related art, not considering the deformation and force-bearing conditions of the aerogel thermal insulation pad will lead to an incomplete simulation result and cannot well analyze the structural risk of the battery pack under different working conditions.

[0005] In a first aspect, the present invention provides a finite element analysis method for a battery pack, the method comprising: obtaining a target mesh model of the battery pack, the elastic modulus value, the compressible thickness, the initial thickness of the aerogel main body in the aerogel thermal insulation pad, and the elastic modulus values respectively corresponding to the silicone sheet rubber frames under different strains, the target mesh model including a plurality of single-cell meshes; constructing a first finite element mesh model for each aerogel thermal insulation pad, the first finite element mesh model including an aerogel main body mesh and a silicone sheet rubber frame mesh, the aerogel main body mesh including an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh, the thickness of the incompressible inner layer mesh being determined based on the compressible thickness and the initial thickness of the aerogel main body; setting the elastic modulus value of the aerogel main body into the first compressible outer layer mesh and the second compressible outer layer mesh of each first finite element mesh model, and setting the elastic modulus values respectively corresponding to the silicone sheet rubber frames under different strains in the silicone sheet rubber frame meshes of each first finite element mesh model to obtain a plurality of second finite element mesh models of the aerogel thermal insulation pad; assembling the plurality of second finite element mesh models between adjacent single-cell meshes of the target mesh model to obtain a third finite element mesh model of the battery pack; inputting the third finite element mesh model into a preset simulation software so that the preset simulation software simulates the target working condition of the third finite element mesh model to obtain the deformation and stress distribution of each second finite element mesh under the target working condition; and judging whether there is a risk of damage to the battery pack under the target working condition based on the deformation and stress distribution of each second finite element mesh under the target working condition.

[0006] The finite element analysis method of the battery pack provided by the present invention constructs the first finite element mesh models of multiple aerogel thermal insulation pads. The first finite element mesh models include aerogel main body meshes and silica gel sheet rubber frame meshes. The aerogel main body meshes include incompressible inner layer meshes, first compressible outer layer meshes, and second compressible outer layer meshes. Set the elastic modulus values of the aerogel main body into the first compressible outer layer meshes and the second compressible outer layer meshes of each first finite element mesh model, and set the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains into the silica gel sheet rubber frame meshes of each first finite element mesh model to obtain multiple second finite element mesh models of the aerogel thermal insulation pads. Assemble the multiple second finite element mesh models between adjacent single cell meshes of the target mesh model to obtain the third finite element mesh model of the battery pack; input the third finite element mesh model into a preset simulation software to enable the preset simulation software to simulate the target working conditions of the third finite element mesh model, obtain the deformation and stress distribution of each second finite element mesh under the target working conditions, and then analyze whether there is a risk of damage to the battery pack under the target working conditions based on the deformation and stress distribution of each second finite element mesh under the target working conditions, improving the standardization of operations and avoiding the differences in model results. The final battery working condition analysis and calculation results are more accurate and comprehensive, solving the problem in the related technology that in the simulation analysis of the battery pack, not considering the deformation and stress conditions of the aerogel thermal insulation pad will lead to incomplete simulation results and inability to well analyze the structural risks of the battery pack under different working conditions.

[0007] In an alternative embodiment, the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad is determined through the following steps: obtain a first compression test curve and a first target strain value. The first compression test curve is used to characterize the correlation between stress and strain when the aerogel main body in the aerogel thermal insulation pad is under compression test; determine the first target slope value corresponding to the first target strain value in the first compression test curve; use the first target slope value as the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad.

[0008] The method provided by this alternative embodiment uses the first target slope value corresponding to the target stress value in the first compression test curve as the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad, effectively reducing the difficulty and complexity of material parameter setting and reducing the calculation amount of the finite element model.

[0009] In an alternative embodiment, the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains are determined through the following steps: obtain a second compression test curve. The second compression test curve is used to characterize the correlation between stress and strain when the silica gel sheet rubber frame in the aerogel thermal insulation pad is under compression test; determine the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains based on the second compression test curve.

[0010] In an alternative embodiment, the first compressible outer grid and the second compressible outer grid have the same thickness. The steps of constructing the first finite element grid model of each aerogel thermal insulation pad include: constructing the initial grids of multiple aerogel thermal insulation pads, where the initial grids include the aerogel main body grids and the silica gel sheet rubber frame grids. The silica gel sheet rubber frame grids include a first inner grid, a second inner grid on one side of the first inner grid, a third inner grid on the other side of the first inner grid, a first outer grid adjacent to the second inner grid, and a second outer grid adjacent to the third inner grid. The thickness of the first inner grid is the same as that of the incompressible inner grid, the thickness of the second inner grid is the same as that of the first compressible outer grid, and the thickness of the third inner grid is the same as that of the second compressible outer grid; performing a co - node operation on the nodes on the adjacent boundary between the first inner grid and the incompressible inner grid in the initial grids of each aerogel thermal insulation pad, performing a co - node operation on the nodes on the adjacent boundary between the second inner grid and the first compressible outer grid, and performing a co - node operation on the third inner grid and the second compressible outer grid to obtain the first finite element grid model corresponding to the initial grid.

[0011] In the method provided by this alternative embodiment, since the positions of all the nodes on the adjacent boundary between the aerogel main body grid and the silica gel sheet rubber frame grid are the same, performing a co - node operation on all the grid nodes on these boundaries to equivalently replace the connection and encapsulation effect between the aerogel main body part and the silica gel sheet rubber frame. When the first finite element grid model constructed in this way is used for simulations under various working conditions, its deformation and stress conditions are more in line with the actual situation, effectively improving the accuracy of the calculation results of the working condition analysis.

[0012] In an alternative embodiment, the steps of determining whether there is a risk of damage to the battery pack under the target working condition based on the deformation and stress distribution of each second finite element grid under the target working condition include: obtaining the stress threshold and deformation threshold of the aerogel thermal insulation pad; determining whether there is a risk of damage to the battery pack under the target working condition based on the stress threshold, deformation threshold, and the deformation and stress distribution of each second finite element grid under the target working condition.

[0013] In an alternative embodiment, the compressible thickness of the aerogel main body is determined through the following steps: determining the second target strain value corresponding to the second target slope value on the first compression test curve, where the second target slope value is equal to the preset threshold; determining the compressible thickness of the aerogel main body based on the second target strain value.

[0014] Second aspect, the present invention provides a finite element analysis device for a battery pack, the device comprising: an acquisition module, configured to acquire a target mesh model of the battery pack, the elastic modulus value, the compressible thickness, the initial thickness of the aerogel main body in the aerogel thermal insulation pad, and the elastic modulus values respectively corresponding to the silica gel sheet glue frames under different strains, the target mesh model including a plurality of single-cell meshes; a construction module, configured to construct a first finite element mesh model for each aerogel thermal insulation pad, the first finite element mesh model including an aerogel main body mesh and a silica gel sheet glue frame mesh, the aerogel main body mesh including an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh, the thickness of the incompressible inner layer mesh being determined based on the compressible thickness and the initial thickness of the aerogel main body; a first determination module, configured to set the elastic modulus value of the aerogel main body into the first compressible outer layer mesh and the second compressible outer layer mesh of each first finite element mesh model, and set the elastic modulus values respectively corresponding to the silica gel sheet glue frames under different strains in the silica gel sheet glue frame meshes of each first finite element mesh model, to obtain a plurality of second finite element mesh models of the aerogel thermal insulation pad; a second determination module, configured to assemble the plurality of second finite element mesh models between adjacent single-cell meshes of the target mesh model, to obtain a third finite element mesh model of the battery pack; a simulation module, configured to input the third finite element mesh model into a preset simulation software, so that the preset simulation software simulates the target working condition of the third finite element mesh model, to obtain the deformation and stress distribution of each second finite element mesh under the target working condition; and a judgment module, configured to judge whether there is a risk of damage to the battery pack under the target working condition based on the deformation and stress distribution of each second finite element mesh under the target working condition.

[0015] Third aspect, the present invention provides a computer device, comprising: a memory and a processor, which are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the finite element analysis method for the battery pack according to the first aspect or any corresponding embodiment thereof.

[0016] Fourth aspect, the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to cause a computer to execute the finite element analysis method for the battery pack according to the first aspect or any corresponding embodiment thereof.

[0017] Fifth aspect, the present invention provides a computer program product, including computer instructions, and the computer instructions are used to cause a computer to execute the finite element analysis method for the battery pack according to the first aspect or any corresponding embodiment thereof. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings required for the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic flowchart of a finite element analysis method for a battery pack according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of an aerogel thermal insulation pad according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of a first finite element mesh model according to an embodiment of the present invention;

[0022] Figure 4 It is a mesh schematic diagram of a second finite element mesh model assembled between single-cell meshes according to an embodiment of the present invention;

[0023] Figure 5 It is a schematic flowchart of another finite element analysis method for a battery pack according to an embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of a first compression test curve according to an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of a silicone sheet rubber frame mesh hierarchical structure according to an embodiment of the present invention;

[0026] Figure 8 It is a schematic diagram of the extra thickness of a single-sided silicone sheet rubber frame mesh compared to the aerogel main body mesh according to an embodiment of the present invention;

[0027] Figure 9 It is a partial schematic diagram of the adjacent boundary between the aerogel main body mesh and the silicone sheet rubber frame mesh;

[0028] Figure 10 It is a schematic flowchart of yet another finite element analysis method for a battery pack according to an embodiment of the present invention;

[0029] Figure 11 It is a contour map of the finite element calculation deformation result after the aerogel mesh model between single-cell meshes is squeezed;

[0030] Figure 12 It is a structural block diagram of a finite element analysis device for a battery pack according to an embodiment of the present invention;

[0031] Figure 13 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the related art, when performing finite element simulation analysis on a battery pack, generally, the aerogel thermal insulation pad is not modeled, and the deformation and stress conditions of the aerogel thermal insulation pad under different working conditions are not considered. Only the stress and deformation conditions of the end plate and the tie strap in the battery pack under different working conditions are simulated and analyzed to determine whether there is a risk of damage to the battery pack. However, in working conditions such as extrusion, expansion, and dropping of the battery pack, if the pressure on the aerogel thermal insulation pad exceeds its bearing capacity, there is also a risk of damage to the aerogel thermal insulation pad. If the deformation and stress conditions of the aerogel thermal insulation pad are not considered in the simulation analysis of the battery pack, it will lead to an incomplete simulation result and cannot well analyze the structural risk of the battery pack under different working conditions.

[0034] In view of this, a finite element analysis method for a battery pack provided by an embodiment of the present application can be applied to a server to implement finite element analysis of the battery pack. The method provided by the embodiment of the present application constructs a first finite element mesh model of multiple aerogel thermal insulation pads. The first finite element mesh model includes an aerogel main body mesh and a silica gel sheet rubber frame mesh. The aerogel main body mesh includes an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh. Set the elastic modulus value of the aerogel main body into the first compressible outer layer mesh and the second compressible outer layer mesh of each first finite element mesh model, and set the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains into the silica gel sheet rubber frame mesh of each first finite element mesh model to obtain multiple second finite element mesh models of the aerogel thermal insulation pad. Assemble the multiple second finite element mesh models between adjacent single cell meshes of the target mesh model to obtain a third finite element mesh model of the battery pack; input the third finite element mesh model into a preset simulation software so that the preset simulation software simulates the target working condition of the third finite element mesh model to obtain the deformation and stress distribution of each second finite element mesh under the target working condition, and then analyze whether there is a risk of damage to the battery pack under the target working condition according to the deformation and stress distribution of each second finite element mesh under the target working condition, improving the standardization of the operation and avoiding the difference in model results. The final battery working condition analysis and calculation results are more accurate and comprehensive, solving the problem in the related technology that in the simulation analysis of the battery pack, not considering the deformation and stress conditions of the aerogel thermal insulation pad will result in incomplete simulation results and cannot well analyze the structural risks of the battery pack under different working conditions.

[0035] According to an embodiment of the present invention, an embodiment of a finite element analysis method for a battery pack is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0036] In this embodiment, a finite element analysis method for a battery pack is provided, which can be used for the above-mentioned server. Figure 1 It is a flowchart of a finite element analysis method for a battery pack according to an embodiment of the present invention, as Figure 1 shown. The process includes the following steps:

[0037] Step S101, obtain a target mesh model of the battery pack, the elastic modulus value, compressible thickness, initial thickness of the aerogel main body in the aerogel thermal insulation pad, and the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains respectively. The target mesh model includes multiple single cell meshes.

[0038] Exemplarily, a battery pack is a combination of multiple battery cells, and an aerogel thermal insulation pad is provided between adjacent battery cells for heat insulation and buffering between the battery cores. In a possible implementation, end plates can also be provided at both ends of the battery pack, and straps are used to fix the end plates of the battery pack and the battery cells. The target mesh model is a mesh model corresponding to the battery pack constructed using finite element modeling software. The target mesh model includes multiple single-battery meshes, and may also include a base mesh, an end plate mesh, a strap mesh, etc. The aerogel thermal insulation pad is composed of an aerogel main body part in the middle and a silica gel sheet rubber frame part on the outside. The schematic diagram of the aerogel thermal insulation pad can be as Figure 2 shown, and the thickness value of the external silica gel sheet rubber frame is greater than the thickness value of the middle aerogel main body. The elastic modulus value of the aerogel main body in the aerogel thermal insulation pad can be determined based on the stress-strain result curve obtained after the compression test of the aerogel. In the embodiments of the present application, the stress-strain result curve of the aerogel can be obtained through the factory instruction manual of the aerogel. The compressible thickness of the aerogel main body can also be determined through the stress-strain result curve of the aerogel, and the initial thickness can be obtained according to the factory instruction manual of the aerogel. The elastic modulus values corresponding to the silica gel sheet rubber frame under different strains can be determined according to the compression curve of the silica gel sheet rubber frame. The compression curve of the silica gel sheet rubber frame is obtained through experimental tests, and generally, relevant data is provided by the material supplier.

[0039] Step S102, construct a first finite element mesh model of each aerogel thermal insulation pad. The first finite element mesh model includes an aerogel main body mesh and a silica gel sheet rubber frame mesh. The aerogel main body mesh includes an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh. The thickness of the incompressible inner layer mesh is determined based on the compressible thickness of the aerogel main body and the initial thickness of the aerogel main body.

[0040] Exemplarily, in the embodiments of the present application, according to the structure of the aerogel thermal insulation pad, the first finite element mesh model is divided into two parts: the middle aerogel main body mesh and the external silica gel sheet rubber frame mesh. The first finite element mesh model can be as Figure 3As shown, it can be directly observed that the first finite element mesh model is divided into a silicone sheet rubber frame mesh part (the gray part around) and a middle aerogel main body mesh part (the blue part in the middle). Since aerogel is very easy to be compressed and deformed in the early stage of compression, it becomes more and more difficult to be compressed in the later stage of compression and basically no longer deforms, that is, it is very difficult to press it anymore. That is to say, the elastic modulus in its material parameters gradually increases during the compression process. The aerogel main body mesh is set into three parts: an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh. The thickness of the incompressible inner layer mesh can be determined according to the compressible thickness of the aerogel main body and the initial thickness of the aerogel main body. The elastic modulus of the incompressible inner layer mesh can be set to the elastic modulus of steel, 210,000 MPa, or other material values with a very large elastic modulus, or even an infinite elastic modulus.

[0041] Step S103, set the elastic modulus value of the aerogel main body into the first compressible outer layer mesh and the second compressible outer layer mesh of each first finite element mesh model, and set the elastic modulus values corresponding to the silicone sheet rubber frame under different strains in the silicone sheet rubber frame mesh of each first finite element mesh model to obtain multiple second finite element mesh models of the aerogel thermal insulation pad.

[0042] Exemplarily, set the elastic modulus value of the aerogel main body into the first compressible outer layer mesh and the second compressible outer layer mesh of each first finite element mesh model. The finite element mesh model built in this way is very easy to deform in the early stage of compression, and the degree of deformation is controlled by the elastic modulus value of the compressible outer layer mesh of the aerogel main body part; in the later stage of compression, because the elastic modulus of the incompressible inner layer mesh is very large, the inner layer mesh is basically unchanged when compressed, which is similar to the effect that aerogel is difficult to compress in the later stage of the experiment.

[0043] Step S104, assemble multiple second finite element mesh models between adjacent single-cell meshes of the target mesh model to obtain a third finite element mesh model of the battery pack.

[0044] Exemplarily, assemble the built second finite element mesh model between the single-cell meshes of the target mesh model for subsequent working condition simulation. The mesh schematic diagram of the second finite element mesh model assembled between the single-cell meshes can be as Figure 4 shown.

[0045] Step S105, input the third finite element mesh model into a preset simulation software so that the preset simulation software simulates the target working condition of the third finite element mesh model to obtain the deformation and stress distribution of each second finite element mesh under the target working condition.

[0046] Exemplarily, the preset simulation software can be any software capable of performing finite element simulation analysis. The embodiments of the present application do not limit the specific content of the preset simulation software, and those skilled in the art can determine it according to requirements. Import the improved model into the relevant simulation analysis software and perform working condition calculations to observe the deformation and stress conditions of the aerogel model during the calculation process. The target working conditions can be working conditions such as battery cell swelling, vibration, shock, extrusion, and drop. The embodiments of the present application do not limit the specific content of the target working conditions, and those skilled in the art can determine it according to requirements.

[0047] Step S106, based on the deformation and stress distribution of each second finite element mesh under the target working condition, determine whether there is a risk of damage to the battery pack under the target working condition.

[0048] Exemplarily, in the embodiments of the present application, based on the deformation and stress distribution of each second finite element mesh under the target working condition, it can be determined whether there is a risk of damage to the corresponding second finite element mesh.

[0049] The finite element analysis method of the battery pack provided in this embodiment constructs a first finite element mesh model of multiple aerogel thermal insulation pads. The first finite element mesh model includes an aerogel main body mesh and a silica gel sheet rubber frame mesh. The aerogel main body mesh includes an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh. Set the elastic modulus value of the aerogel main body into the first compressible outer layer mesh and the second compressible outer layer mesh of each first finite element mesh model, and set the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains in the silica gel sheet rubber frame mesh of each first finite element mesh model to obtain multiple second finite element mesh models of the aerogel thermal insulation pad. Assemble the multiple second finite element mesh models between the adjacent single battery meshes of the target mesh model to obtain a third finite element mesh model of the battery pack; input the third finite element mesh model into the preset simulation software to enable the preset simulation software to simulate the target working condition of the third finite element mesh model, obtain the deformation and stress distribution of each second finite element mesh under the target working condition, and then analyze whether there is a risk of damage to the battery pack under the target working condition according to the deformation and stress distribution of each second finite element mesh under the target working condition, improving the standardization of operations, avoiding the differences in model results, and making the final battery working condition analysis and calculation results more accurate and comprehensive. It solves the problem in the related art that in the simulation analysis of the battery pack, not considering the deformation and stress conditions of the aerogel thermal insulation pad will result in incomplete simulation results and cannot well analyze the structural risks of the battery pack under different working conditions.

[0050] In this embodiment, a finite element analysis method of a battery pack is provided, which can be used for the above-mentioned server. Figure 5 It is a flowchart of the finite element analysis method of the battery pack according to the embodiment of the present invention, as Figure 5As shown, the process includes the following steps:

[0051] Step S501, obtain the target grid model of the battery pack, the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad, the compressible thickness, the initial thickness of the aerogel main body, and the elastic modulus values corresponding to different strains of the silicone sheet rubber frame respectively. The target grid model includes multiple single-cell grids. For details, please refer to Figure 1 Step S101 of the embodiment shown, which will not be elaborated here.

[0052] In some alternative embodiments, the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad is determined by the following steps:

[0053] Step a1, obtain the first compression test curve and the first target strain value.

[0054] Exemplarily, the first compression test curve is used to characterize the correlation between stress and strain of the aerogel main body in the aerogel thermal insulation pad during the compression test. Except for materials that have directly measured elastic modulus values through experiments, for materials that do not have elastic modulus values but have stress-strain result curves after corresponding compression tests, generally, the slope value obtained from the two points of the point on the curve to which the material is to be compressed by a certain percentage and the origin of the curve is used as the equivalent elastic modulus value input. In the embodiments of the present application, the first compression test curve can be as Figure 6 shown Figure 6 Curves 1 to 5 in represent the compression test curves obtained by the aerogel main body in different specimen tests. Generally speaking, if the aerogel main body is compressed to 60%, and it is difficult for the aerogel to deform when compressed further, then the first target strain value is 60%.

[0055] Step a2, determine the first target slope value corresponding to the first target strain value in the first compression test curve.

[0056] Exemplarily, the slope value of the point corresponding to the target strain value on the first compression test curve is used as the first target slope value.

[0057] Step a3, use the first target slope value as the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad. Exemplarily, in the embodiments of the present application, when the aerogel is compressed further and it is difficult for the aerogel to deform, then according to the 2.5 MPa stress corresponding to 60% strain, the slope of the corresponding point on the curve is calculated to be approximately 4.17, that is, the elastic modulus value of the aerogel main body is set to 4.17 MPa.

[0058] In some alternative embodiments, the elastic modulus values corresponding to different strains of the silicone sheet rubber frame are determined by the following steps:

[0059] Step b1, obtain the second compression test curve.

[0060] Exemplarily, the second compression test curve is used to characterize the correlation between stress and strain of the silica gel sheet glue frame in the aerogel thermal insulation pad. In the embodiments of the present application, the second compression test curve is obtained according to the test data provided by the supplier of the silica gel sheet glue frame test data.

[0061] Step b2, determine the elastic modulus values corresponding to the silica gel sheet glue frame at different strains based on the second compression test curve.

[0062] In some alternative embodiments, the compressible thickness of the aerogel body is determined by the following steps:

[0063] Step c1, determine the second target strain value corresponding to the second target slope value on the first compression test curve.

[0064] Exemplarily, the second target slope value is equal to a preset threshold. The embodiments of the present application do not limit the specific content of the preset threshold, and those skilled in the art can determine it according to requirements. In the embodiments of the present application, the second target strain value may include, but is not limited to, 60%.

[0065] Step c2, determine the compressible thickness of the aerogel body based on the second target strain value.

[0066] Exemplarily, in the embodiments of the present application, the second target strain value and the initial thickness of the aerogel body are used to determine the compressible thickness of the aerogel body. Specifically, when the second target strain value is 60%, multiply the initial thickness X of the aerogel body by 60% to calculate the compressible thickness of the aerogel body.

[0067] Step S502, construct a plurality of first finite element mesh models of the aerogel thermal insulation pad. The first finite element mesh model includes an aerogel body mesh and a silica gel sheet glue frame mesh. The aerogel body mesh includes an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh. The thickness of the incompressible inner layer mesh is determined based on the compressible thickness of the aerogel body and the initial thickness of the aerogel body.

[0068] Specifically, the thicknesses of the first compressible outer layer mesh and the second compressible outer layer mesh are the same. The above step S502 includes:

[0069] Step S5021, construct an initial mesh of a plurality of aerogel thermal insulation pads. The initial mesh includes an aerogel body mesh and a silica gel sheet glue frame mesh.

[0070] Exemplarily, since the thickness of the silicone sheet glue frame is greater than the thickness of the aerogel main body, and the aerogel main body is divided into three layers of grids: an incompressible inner layer grid, a first compressible outer layer grid, and a second compressible outer layer grid. For the standardization and convenience of assembling the aerogel main body grid and the silicone sheet glue frame grid, the silicone sheet glue frame grid is divided into five layers of grids, including a first inner layer grid, a second inner layer grid located on one side of the first inner layer grid, a third inner layer grid located on the other side of the first inner layer grid, a first outer layer grid adjacent to the second inner layer grid, and a second outer layer grid adjacent to the third inner layer grid. The thickness of the first inner layer grid is the same as that of the incompressible inner layer grid, the thickness of the second inner layer grid is the same as that of the first compressible outer layer grid, and the thickness of the third inner layer grid is the same as that of the second compressible outer layer grid. In the embodiment of the present application, the silicone sheet glue frame grid part is divided into five layers, as Figure 7 shown. The total thickness of these five layers is the thickness of the actual silicone sheet glue frame. The thickness of the innermost layer grid is equal to the thickness of the aerogel inner layer grid. The thicknesses of the two layers of grids adjacent to the innermost layer grid are respectively equal to the thickness of the aerogel outer layer grid. The remaining thickness is the thickness by which the silicone sheet glue frame exceeds the aerogel main body. That is, the internal stratification of the silicone sheet glue frame grid is determined according to the compressible thickness of the actual aerogel main body. The schematic diagram of the extra thickness of the unilateral silicone sheet glue frame grid compared to the aerogel main body grid is as Figure 8 shown.

[0071] Step S5022: Perform co-node operations on the nodes on the adjacent boundaries of the first inner layer grid and the incompressible inner layer grid in the initial grid of each aerogel heat insulation pad, perform co-node operations on the nodes on the adjacent boundaries of the second inner layer grid and the first compressible outer layer grid, and perform co-node operations on the third inner layer grid and the second compressible outer layer grid to obtain the first finite element grid model corresponding to the initial grid.

[0072] Exemplarily, in the embodiment of the present application, the partial schematic diagram of the adjacent boundary between the aerogel main body grid and the silicone sheet glue frame grid can be as Figure 9 shown. The positions of all the nodes on the adjacent boundary between the aerogel main body grid and the silicone sheet glue frame grid are the same. Perform co-node operations on all the grid nodes on these boundaries to equivalently replace the connection and encapsulation effect between the aerogel main body part and the silicone sheet glue frame.

[0073] Step S503: Set the elastic modulus value of the aerogel main body into the first compressible outer layer grid and the second compressible outer layer grid of each first finite element grid model, and set the elastic modulus values corresponding to the silicone sheet glue frame under different strains into the silicone sheet glue frame grid of each first finite element grid model to obtain multiple second finite element grid models of the aerogel heat insulation pad. For details, please refer to Figure 1 the steps of Embodiment shown in it, and details will not be repeated here.

[0074] Step S504: Assemble multiple second finite element mesh models between adjacent single-cell meshes of the target mesh model to obtain a third finite element mesh model of the battery pack. For details, please refer to Figure 1 Step S104 of the embodiment shown, which will not be elaborated here.

[0075] Step S505: Input the third finite element mesh model into a preset simulation software to enable the preset simulation software to simulate the target working conditions of the third finite element mesh model, and obtain the deformation and stress distribution of each second finite element mesh under the target working conditions. For details, please refer to Figure 1 Step S105 of the embodiment shown, which will not be elaborated here.

[0076] Step S506: Determine whether there is a risk of damage to the battery pack under the target working conditions based on the deformation and stress distribution of each second finite element mesh under the target working conditions. For details, please refer to Figure 1 Step S106 of the embodiment shown, which will not be elaborated here.

[0077] In this embodiment, a finite element analysis method for a battery pack is provided, which can be used for the above-mentioned server. Figure 10 It is a flowchart of the finite element analysis method for a battery pack according to an embodiment of the present invention. As Figure 10 shown, the process includes the following steps:

[0078] Step S1001: Obtain the target mesh model of the battery pack, the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad, the compressible thickness, the initial thickness of the aerogel main body, and the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains. The target mesh model includes multiple single-cell meshes. For details, please refer to Figure 1 Step S501 of the embodiment shown, which will not be elaborated here.

[0079] Step S1002: Construct a first finite element mesh model for each aerogel thermal insulation pad. The first finite element mesh model includes an aerogel main body mesh and a silica gel sheet rubber frame mesh. The aerogel main body mesh includes an incompressible inner layer mesh, a first compressible outer layer mesh, and a second compressible outer layer mesh. The thickness of the incompressible inner layer mesh is determined based on the compressible thickness and the initial thickness of the aerogel main body. For details, please refer to Figure 1 Step S502 of the embodiment shown, which will not be elaborated here.

[0080] Step S1003: Set the elastic modulus value of the aerogel main body into the first compressible outer layer mesh and the second compressible outer layer mesh of each first finite element mesh model, and set the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains in the silica gel sheet rubber frame mesh of each first finite element mesh model to obtain multiple second finite element mesh models of the aerogel thermal insulation pad. For details, please refer toFigure 1 Step S503 of the illustrated embodiment will not be elaborated herein.

[0081] Step S1004: Assemble multiple second finite element mesh models between adjacent single cell meshes of the target mesh model to obtain a third finite element mesh model of the battery pack. For details, please refer to Figure 1 Step S504 of the illustrated embodiment will not be elaborated herein.

[0082] Step S1005: Input the third finite element mesh model into a preset simulation software to enable the preset simulation software to simulate the target working conditions of the third finite element mesh model, and obtain the deformation and stress distribution of each second finite element mesh under the target working conditions. For details, please refer to Figure 1 Step S505 of the illustrated embodiment will not be elaborated herein.

[0083] Step S1006: Determine whether there is a risk of damage to the battery pack under the target working conditions based on the deformation and stress distribution of each second finite element mesh under the target working conditions.

[0084] Specifically, the above step S1006 includes:

[0085] Step S10061: Obtain the stress threshold and deformation threshold of the aerogel thermal insulation pad.

[0086] Exemplarily, in the embodiment of the present application, when obtaining the stress threshold and deformation threshold of the aerogel thermal insulation pad, the stress threshold and deformation threshold at different positions of the aerogel thermal insulation pad are different. The stress threshold is determined based on the stress-bearing capacity of the aerogel thermal insulation pad. When the stress received by the target position of the aerogel thermal insulation pad is less than the stress threshold corresponding to the target position, there is no risk of damage to the target position of the aerogel thermal insulation pad. Similarly, when the deformation of the target position of the aerogel thermal insulation pad is less than the deformation threshold corresponding to the target position, there is no risk of damage to the target position of the aerogel thermal insulation pad. The target position can be any position on the aerogel thermal insulation pad.

[0087] Step S10062: Determine whether there is a risk of damage to the battery pack under the target working conditions based on the stress threshold, deformation threshold, and the deformation and stress distribution of each second finite element mesh under the target working conditions.

[0088] Exemplarily, in the embodiment of the present application, the embodiment of the present application takes the battery pack including 6 single cells and 5 aerogel thermal insulation pads as an example for exemplary illustration. The finite element calculation deformation result cloud map of the aerogel mesh model between the single cell meshes after being squeezed is as Figure 11As shown, different colors represent different deformation amounts. Among them, the closer the color is to red (long wavelength), the greater the deformation, and the closer it is to blue (short wavelength), the smaller the deformation. From this, the deformation effects of each second finite element mesh under the target working condition can be observed. When the deformation value of the second finite element mesh at the target position exceeds the deformation threshold and / or the stress value of the second finite element mesh at the target position exceeds the stress threshold, there is a risk of damage to the aerogel thermal insulation pad corresponding to the second finite element mesh under the target working condition.

[0089] In this embodiment, a finite element analysis device for a battery pack is also provided. This device is used to implement the above-mentioned embodiments and preferred embodiments, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0090] This embodiment provides a finite element analysis device for a battery pack, as Figure 12 shown, including:

[0091] An acquisition module 1201, configured to acquire a target grid model of the battery pack, the elastic modulus value, compressible thickness, initial thickness of the aerogel main body in the aerogel thermal insulation pad, and the elastic modulus values corresponding to the silicone sheet rubber frames under different strains. The target grid model includes a plurality of single-cell grids;

[0092] A construction module 1202, configured to construct a first finite element grid model of each aerogel thermal insulation pad. The first finite element grid model includes an aerogel main body grid and a silicone sheet rubber frame grid. The aerogel main body grid includes an incompressible inner layer grid, a first compressible outer layer grid, and a second compressible outer layer grid. The thickness of the incompressible inner layer grid is determined based on the compressible thickness and the initial thickness of the aerogel main body;

[0093] A first determination module 1203, configured to set the elastic modulus value of the aerogel main body into the first compressible outer layer grid and the second compressible outer layer grid of each first finite element grid model, and set the elastic modulus values corresponding to the silicone sheet rubber frames under different strains in the silicone sheet rubber frame grid of each first finite element grid model to obtain a plurality of second finite element grid models of the aerogel thermal insulation pad;

[0094] A second determination module 1204, configured to assemble a plurality of second finite element grid models between adjacent single-cell grids of the target grid model to obtain a third finite element grid model of the battery pack;

[0095] The simulation module 1205 is configured to input the third finite element mesh model into a preset simulation software, so that the preset simulation software simulates the target working condition of the third finite element mesh model, and obtains the deformation and stress distribution of each second finite element mesh under the target working condition;

[0096] The judgment module 1206 is configured to judge whether there is a risk of damage to the battery pack under the target working condition based on the deformation and stress distribution of each second finite element mesh under the target working condition.

[0097] In some alternative embodiments, the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad is determined through the following steps:

[0098] Obtain a first compression test curve and a first target strain value, where the first compression test curve is used to characterize the correlation between stress and strain of the aerogel main body in the aerogel thermal insulation pad during the compression test;

[0099] Determine a first target slope value corresponding to the first target strain value in the first compression test curve;

[0100] Take the first target slope value as the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad.

[0101] In some alternative embodiments, the elastic modulus values corresponding to different strains of the silicone sheet rubber frame are determined through the following steps:

[0102] Obtain a second compression test curve, where the second compression test curve is used to characterize the correlation between stress and strain of the silicone sheet rubber frame in the aerogel thermal insulation pad during the compression test;

[0103] Determine the elastic modulus values corresponding to different strains of the silicone sheet rubber frame based on the second compression test curve.

[0104] In some alternative embodiments, the first compressible outer layer grid and the second compressible outer layer grid have the same thickness. The construction module 1202 includes:

[0105] A construction sub-module is configured to construct initial grids of multiple aerogel thermal insulation pads. The initial grids include aerogel main body grids and silicone sheet rubber frame grids. The silicone sheet rubber frame grids include a first inner layer grid, a second inner layer grid on one side of the first inner layer grid, a third inner layer grid on the other side of the first inner layer grid, a first outer layer grid adjacent to the second inner layer grid, and a second outer layer grid adjacent to the third inner layer grid. The thickness of the first inner layer grid is the same as that of the incompressible inner layer grid, the thickness of the second inner layer grid is the same as that of the first compressible outer layer grid, and the thickness of the third inner layer grid is the same as that of the second compressible outer layer grid;

[0106] A processing sub-module, configured to perform co-node operations on the nodes on the adjacent boundaries between the first inner layer grid and the incompressible inner layer grid in the initial grid of each aerogel thermal insulation pad, perform co-node operations on the nodes on the adjacent boundaries between the second inner layer grid and the first compressible outer layer grid, and perform co-node operations on the third inner layer grid and the second compressible outer layer grid, so as to obtain a first finite element grid model corresponding to the initial grid.

[0107] In some alternative embodiments, the determination module 1206 includes:

[0108] An acquisition sub-module, configured to acquire the stress threshold and the deformation threshold of the aerogel thermal insulation pad;

[0109] A determination sub-module, configured to determine whether there is a risk of damage to the battery pack under the target working condition based on the stress threshold, the deformation threshold, and the deformation and stress distribution of each second finite element grid under the target working condition.

[0110] In some alternative embodiments, the compressible thickness of the aerogel main body is determined through the following steps:

[0111] Determine the second target strain value corresponding to the second target slope value on the first compression test curve, where the second target slope value is equal to the preset threshold; determine the compressible thickness of the aerogel main body based on the second target strain value.

[0112] The further function descriptions of the above-mentioned various modules and units are the same as those in the corresponding embodiments above, and will not be elaborated here.

[0113] The finite element analysis device of the battery pack in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0114] The embodiment of the present invention further provides a computer device having the above-mentioned Figure 12 finite element analysis device of the battery pack as shown.

[0115] Please refer to Figure 13 , Figure 13 which is a schematic structural diagram of a computer device provided by an alternative embodiment of the present invention. As shown in Figure 13As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting the components, including a high-speed interface and a low-speed interface. Each component communicates with each other using different buses and can be installed on a common motherboard or in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 13 In [the figure], a processor 10 is taken as an example.

[0116] The processor 10 can be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above-mentioned hardware chip can be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above-mentioned programmable logic device can be a complex programmable logic device, a field-programmable gate array, a generic array logic, or any combination thereof.

[0117] Among them, the memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiments.

[0118] The memory 20 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the computer device, etc. In addition, the memory 20 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 can optionally include a memory remotely set relative to the processor 10, and these remote memories can be connected to the computer device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0119] The memory 20 can include a volatile memory, such as a random access memory; the memory can also include a non-volatile memory, such as a flash memory, a hard disk, or a solid-state drive; the memory 20 can also include a combination of the above types of memories.

[0120] The computer device further includes a communication interface 30 for the computer device to communicate with other devices or communication networks.

[0121] Embodiments of the present invention also provide a computer-readable storage medium. The method according to the embodiments of the present invention can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented as computer code that is originally stored in a remote storage medium or a non-transitory machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored as such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid-state drive, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0122] A part of the present invention can be applied as a computer program product, for example, computer program instructions. When executed by a computer, through the operation of the computer, the method and / or technical solution according to the present invention can be called or provided. Those skilled in the art should be able to understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Herein, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to the computer.

[0123] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A finite element analysis method for a battery pack, characterized in that, The method includes: Obtaining a target grid model of a battery pack, the elastic modulus value, compressible thickness, initial thickness of the aerogel main body in an aerogel thermal insulation pad, and the elastic modulus values corresponding to the silicone sheet rubber frames under different strains respectively. The target grid model includes a plurality of single-cell grids; Constructing a first finite element grid model for each aerogel thermal insulation pad. The first finite element grid model includes an aerogel main body grid and a silicone sheet rubber frame grid. The aerogel main body grid includes an incompressible inner layer grid, a first compressible outer layer grid, and a second compressible outer layer grid. The thickness of the incompressible inner layer grid is determined based on the compressible thickness and the initial thickness of the aerogel main body; Setting the elastic modulus value of the aerogel main body into the first compressible outer layer grid and the second compressible outer layer grid of each first finite element grid model, and setting the elastic modulus values corresponding to the silicone sheet rubber frames under different strains in the silicone sheet rubber frame grids of each first finite element grid model to obtain a plurality of second finite element grid models of the aerogel thermal insulation pad; Assembling the plurality of second finite element grid models between adjacent single-cell grids of the target grid model to obtain a third finite element grid model of the battery pack; Inputting the third finite element grid model into a preset simulation software to enable the preset simulation software to simulate the target working condition of the third finite element grid model, and obtaining the deformation and stress distribution conditions of each second finite element grid under the target working condition; Judging whether there is a risk of damage to the battery pack under the target working condition based on the deformation and stress distribution conditions of each second finite element grid under the target working condition.

2. The method according to claim 1, wherein The elastic modulus value of the aerogel main body in the aerogel thermal insulation pad is determined through the following steps: Obtaining a first compression test curve and a first target strain value. The first compression test curve is used to characterize the correlation between stress and strain when the aerogel main body in the aerogel thermal insulation pad is under compression test; Determining a first target slope value corresponding to the first target strain value in the first compression test curve; Taking the first target slope value as the elastic modulus value of the aerogel main body in the aerogel thermal insulation pad.

3. The method according to claim 1, wherein The elastic modulus values corresponding to the silicone sheet rubber frames under different strains are determined through the following steps: Obtaining a second compression test curve. The second compression test curve is used to characterize the correlation between stress and strain when the silicone sheet rubber frame in the aerogel thermal insulation pad is under compression test; Determining the elastic modulus values corresponding to the silicone sheet rubber frames under different strains based on the second compression test curve.

4. The method according to any one of claims 1 to 3, characterized in that, The thicknesses of the first compressible outer layer grid and the second compressible outer layer grid are the same. The step of constructing the first finite element grid model for each aerogel thermal insulation pad includes: Construct the initial meshes of multiple aerogel thermal insulation pads, where the initial meshes include aerogel main body meshes and silica gel sheet rubber frame meshes. The silica gel sheet rubber frame meshes include a first inner layer mesh, a second inner layer mesh located on one side of the first inner layer mesh, a third inner layer mesh located on the other side of the first inner layer mesh, a first outer layer mesh adjacent to the second inner layer mesh, and a second outer layer mesh adjacent to the third inner layer mesh. The thickness of the first inner layer mesh is the same as that of the incompressible inner layer mesh, the thickness of the second inner layer mesh is the same as that of the first compressible outer layer mesh, and the thickness of the third inner layer mesh is the same as that of the second compressible outer layer mesh; Perform co - node operations on the nodes on the adjacent boundaries between the first inner layer mesh and the incompressible inner layer mesh in the initial meshes of each aerogel thermal insulation pad, perform co - node operations on the nodes on the adjacent boundaries between the second inner layer mesh and the first compressible outer layer mesh, and perform co - node operations on the third inner layer mesh and the second compressible outer layer mesh to obtain the first finite element mesh models corresponding to the initial meshes.

5. The method according to claim 1, wherein The step of judging whether there is a risk of damage to the battery pack under the target working condition based on the deformation and stress distribution of each second finite element mesh under the target working condition includes: Obtain the stress threshold and deformation threshold of the aerogel thermal insulation pad; Judge whether there is a risk of damage to the battery pack under the target working condition based on the stress threshold, deformation threshold, and the deformation and stress distribution of each second finite element mesh under the target working condition.

6. The method according to claim 2, wherein The compressible thickness of the aerogel main body is determined through the following steps: Determine the second target strain value corresponding to the second target slope value on the first compression test curve, where the second target slope value is equal to the preset threshold; Determine the compressible thickness of the aerogel main body based on the second target strain value.

7. A finite element analysis device for a battery pack, characterized in that, The device includes: An acquisition module, configured to acquire the target mesh model of the battery pack, the elastic modulus value, compressible thickness, initial thickness of the aerogel main body in the aerogel thermal insulation pad, and the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains. The target mesh model includes multiple single - battery meshes; A construction module, configured to construct the first finite element mesh models of each aerogel thermal insulation pad. The first finite element mesh models include aerogel main body meshes and silica gel sheet rubber frame meshes. The aerogel main body meshes include incompressible inner layer meshes, first compressible outer layer meshes, and second compressible outer layer meshes. The thickness of the incompressible inner layer meshes is determined based on the compressible thickness and the initial thickness of the aerogel main body; A first determination module, configured to set the elastic modulus value of the aerogel main body into the first compressible outer layer meshes and the second compressible outer layer meshes of each first finite element mesh model, and set the elastic modulus values corresponding to the silica gel sheet rubber frame under different strains in the silica gel sheet rubber frame meshes of each first finite element mesh model to obtain multiple second finite element mesh models of the aerogel thermal insulation pad; A second determination module that assembles a plurality of second finite element mesh models between adjacent single-cell meshes of the target mesh model to obtain a third finite element mesh model of the battery pack; A simulation module configured to input the third finite element mesh model into a preset simulation software, so that the preset simulation software simulates the target working condition of the third finite element mesh model to obtain the deformation and stress distribution of each second finite element mesh under the target working condition; A judgment module for judging whether there is a risk of damage to the battery pack under the target working condition based on the deformation and stress distribution of each second finite element mesh under the target working condition.

8. A computer device, characterized in that, Comprising: A memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the finite element analysis method of the battery pack according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, Computer instructions are stored on the computer-readable storage medium, and the computer instructions are used to cause a computer to execute the finite element analysis method of the battery pack according to any one of claims 1 to 6.

10. A computer program product, characterized in that, Comprising computer instructions for causing a computer to execute the finite element analysis method of the battery pack according to any one of claims 1 to 6.

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