CN116796595A

CN116796595A - Cell structure modeling method, device and storage medium in new energy battery expansion simulation

Info

Publication number: CN116796595A
Application number: CN202310673814.0A
Authority: CN
Inventors: 蔡存朋; 武斌; 张醒国; 周晓昱; 马明辉; 沈宇航; 刘洋; 王宏飞; 曹征栋; 白晓松
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2023-06-08
Filing date: 2023-06-08
Publication date: 2023-09-22

Abstract

The application discloses a cell structure modeling method in new energy battery expansion simulation, which belongs to the technical field of batteries and specifically comprises the following steps: finite element modeling of a cell expansion simulation key structure; comprising the following steps: finite element modeling of cell shell, finite element modeling of cell internal structure and soft cushion finite element modeling; model assembly definition; defining parameters of structural materials of each part; and (5) completing the cell expansion simulation modeling. The internal structure of the battery cell of the method adopts homogenization treatment, and the size of a homogenized part is determined by the size of an outer envelope of the actual internal structure; the expansion of the battery core is simulated by the thermal expansion of the internal homogenization part, and the expansion coefficient of the internal homogenization material is the same value; the gasset unit is adopted to simulate the soft cushion, and the attribute parameters of the gasset unit are defined according to the compression characteristic curve of the soft cushion, so that the simulation precision is high and the convergence is good; and the energy absorption gap is assumed to be an energy absorption soft cushion with extremely small rigidity, and a gasset unit is adopted for simulation. The method has high simulation precision and good convergence.

Description

Cell structure modeling method, device and storage medium in new energy battery expansion simulation

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a method, equipment and a storage medium for modeling a battery cell structure in expansion simulation of a new energy battery.

Background

In order to solve the problems of global warming and increasing environmental pollution, carbon peak and carbon neutralization plans are proposed in various countries in the world, and the national commitment of 2030 carbon peak and 2060 carbon neutralization is also made. Based on the background, new energy automobiles are developed to walk into the expressway. According to statistics, the permeability of new energy automobiles in China reaches 28% in 2022. With the popularization of new energy automobiles, the problem of cruising and safety of the new energy automobiles is increasingly attracting attention.

The lithium ion battery can be accompanied with the expansion phenomenon in the use process, and the phenomenon has great influence on the cruising and safety of the new energy automobile.

In the development process of products, two means are generally available for obtaining the strength of the battery structure under the expansion load, one is a test means, and the test means has long period and high cost and can only be developed under the condition of having a product object; the other means is to obtain the strength of the battery structure under the expansion load by a simulation means, and the method has short period and low cost and does not need a product object as a condition. At present, the cell expansion simulation technology is still in an exploration stage, the simulation of energy absorption structures such as cushions among cells generally causes difficult convergence, and the model simplification is unreasonable and causes low simulation precision.

Disclosure of Invention

Aiming at the problems that the simulation of energy absorption structures such as a cushion among cells and the like in the prior art generally causes difficult convergence, the model is simplified unreasonable and the simulation precision is low and the like, the application provides a cell structure modeling method, equipment and a storage medium in the expansion simulation of a new energy battery, wherein the cell internal structure of the method adopts homogenization treatment, and the size of a homogenized part is determined by the size of an outer envelope of an actual internal structure; the expansion of the battery core is simulated by the thermal expansion of the internal homogenization part, and the expansion coefficient of the internal homogenization material is the same value; the soft cushion between the electric cores is simulated by adopting a gasset unit, and attribute parameters of the gasset unit are defined according to characteristics of an electric core expansion simulation model, thickness of the soft cushion and compression characteristic curves of the soft cushion; and the energy absorption gap between the electric cores is assumed to be an air cushion with extremely small rigidity, the air cushion is simulated by adopting a gasset unit, and the properties of the gasset unit are defined according to the characteristics of the electric core expansion simulation model and the thickness of the air cushion.

The application is realized by the following technical scheme:

the cell structure modeling method in the new energy battery expansion simulation specifically comprises the following steps:

s1, finite element modeling of a cell expansion simulation key structure;

comprising the following steps: finite element modeling of cell shell, finite element modeling of cell internal structure and soft cushion finite element modeling;

s2, model assembly definition;

s3, defining parameters of structural materials of each part;

and S4, completing the cell expansion simulation modeling.

Further, in step S1, the finite element modeling of the cell housing specifically includes the following:

the external structure of the battery core directly adopts a real structure or performs finite element modeling after performing proper geometric simplification;

and (3) defining a cell local coordinate system: the center of the battery cell is an origin, the X axis is the thickness direction of the battery cell, the Z axis is vertical upwards, and the Y axis accords with the right-hand spiral rule; two vertical surfaces of the battery cell and the X axis are defined as large surfaces of the battery cell, two vertical surfaces of the battery cell and the Z axis are respectively upper and lower surfaces, and two vertical surfaces of the battery cell and the Y axis are side surfaces.

Further, in step S1, the finite element modeling of the internal structure of the battery cell specifically includes the following:

firstly, carrying out homogenization treatment on the internal structure of the battery cell, namely considering the internal structure as a homogenized whole, determining the size of a homogenized part according to the outer envelope size of the internal structure with the brand-new battery cell SOC of 0, and then carrying out finite element modeling on the homogenized part.

Further, in step S1, the cushion finite element modeling is performed by using a gasset unit, and the gasset unit attribute parameters are defined according to the characteristics of the cell expansion simulation model, the cushion thickness and the cushion compression characteristic curve.

Further, in step S1, the soft pad finite element modeling specifically includes the following:

if a soft cushion is arranged between the battery cells, a finite element model of the soft cushion between the battery cells is built, and a gasset unit is adopted for simulation;

if no cushion exists between the cells, the energy absorption gap between the cells is defined as an air cushion, finite element modeling of the air cushion between the cells is carried out, hexahedral cells are built, the grid is 1 layer in the thickness direction, and the type is defined as a gasset cell.

Further, in step S2, the model assembly definition specifically includes:

A. for the cell housing and cell internal homogenization structure:

the upper surface, the lower surface and the side surface do not define a connection relationship, and Tie binding connection is defined between the large surface of the battery cell shell and the internal homogenization structure;

B. there is the cushion to the electricity between the core:

the soft cushion and the cell outer shell are defined as a small slip Contact relation;

C. the energy absorption gap is formed between the battery cells:

the air cushions are respectively defined as small slip contacts with the cell housing.

Further, in step S3, each part of structural material parameter definition specifically includes:

A. cell housing:

defined in terms of elastic material, including elastic modulus E, poisson's ratio μ;

B. cell internal homogenization structure:

defining the elastic modulus E, poisson's ratio mu and thermal expansion coefficient alpha of the homogenized material in the cell;

C. cushion between electric core:

D. energy absorption gaps among the electric cores.

In a second aspect, the present application further provides a computer device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the method for modeling a cell structure in the new energy battery expansion simulation according to any one of the embodiments of the present application when executing the program.

In a third aspect, the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements a method for modeling a cell structure in a new energy battery expansion simulation according to any one of the embodiments of the present application.

Compared with the prior art, the application has the following advantages:

(1) The actual size of the internal structure is fully considered in the homogenization treatment of the internal structure of the battery cell, namely the size of the homogenization structure is determined according to the outer envelope size of the internal structure, and the method is different from the assumption that the current homogenization structure fills the battery cell shell;

(2) According to the generation mechanism of the expansion of the battery cell, namely the volume change occurs in the charging and discharging process of the internal lamination structure, the phenomenon that the internal homogenization structure uniformly expands to accurately simulate the phenomenon is defined, and the method is different from the current method that the expansion characteristic is defined by dividing the homogenization part from inside to outside under the condition that the battery cell shell is fully filled with the homogenization structure;

(3) In the expansion simulation process of the soft cushion between the battery cells, the simulation analysis is difficult or even impossible to converge due to overlarge grid extrusion deformation and even grid penetration which occur due to small rigidity, and the prior simulation technology does not solve the problem. The application innovatively adopts the gasset unit to simulate the soft cushion, and the attribute parameters of the gasset unit are defined according to the compression characteristic curve of the soft cushion, so that the simulation precision of the method is high, and the convergence is good;

(4) In order to improve the energy absorption effect, an energy absorption gap is always arranged between the battery cores. If the contact relation is directly defined in the simulation, the calculation convergence is poor or even not converged due to the fact that the initial contact relation is difficult to establish. In order to solve the problem, the application innovatively assumes the energy absorption gap as an energy absorption cushion with extremely small rigidity, and adopts a gasset unit for simulation. The method has high simulation precision and good convergence.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

FIG. 1 is a schematic flow chart of a method for modeling a cell structure in new energy battery expansion simulation;

FIG. 2 is a simplified structure and partial coordinate schematic diagram of a cell housing;

FIG. 3 is a schematic diagram of a cell housing grid;

FIG. 4 is a schematic view of an internal homogenized partial mesh;

FIG. 5 is a schematic view of a cushion mesh;

FIG. 6 is a schematic diagram of an air cushion grid;

FIG. 7 is a schematic diagram of a model assembly;

fig. 8 is a schematic structural diagram of an electronic device in embodiment 3 of the present application.

Detailed Description

For a clear and complete description of the technical scheme and the specific working process thereof, the following specific embodiments of the application are provided with reference to the accompanying drawings in the specification:

in the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Example 1

As shown in fig. 1, a flow chart of a method for modeling a cell structure in expansion simulation of a new energy battery in this embodiment is shown, where the modeling method specifically includes the following steps:

s1, finite element modeling of a cell expansion simulation key structure;

s2, model assembly definition;

s3, defining parameters of structural materials of each part;

and S4, completing the cell expansion simulation modeling.

Further, in step S2, the model assembly definition specifically includes:

A. for the cell housing and cell internal homogenization structure:

B. there is the cushion to the electricity between the core:

C. the energy absorption gap is formed between the battery cells:

A. cell housing:

B. cell internal homogenization structure:

C. cushion between electric core:

D. energy absorption gaps among the electric cores.

Example 2

1. finite element modeling of a cell expansion simulation key structure;

(1) The structure is formed;

the cell expansion simulation key structure comprises a cell and a soft cushion between the cells, wherein the cell consists of a cell shell and a cell internal structure;

in this embodiment, for a square cell, the cell local coordinate system defines: the center of the battery cell is the origin, the X axis is the thickness direction of the battery cell, the Z axis is vertical upwards, and the Y axis accords with the right-hand spiral rule. Defining two vertical surfaces of the battery cell and the X axis as large surfaces of the battery cell, respectively, and defining two vertical surfaces of the battery cell and the Z axis as upper and lower surfaces, wherein the two vertical surfaces of the battery cell and the Y axis are side surfaces, and simplifying the structure and the coordinate schematic diagram as shown in figure 2;

(2) A cell housing;

the cell shell is square, geometric characteristics are simplified, finite element modeling is carried out, hexahedral grids are used, 1-layer grids in the thickness direction are used, and the grids are shown in an opinion graph 3;

(3) An internal structure of the cell;

the internal structure of the battery cell comprises a positive electrode, a negative electrode, electrolyte, a diaphragm and other structures.

In this embodiment, for a square cell: the internal homogenizing part is simplified into a cuboid, and the size of the cuboid is determined in a mode that: based on the brand new battery cell with soc=0, the thickness dimension is the maximum thickness of the internal structure, the width dimension is the maximum width of the internal structure, and the height is the maximum height of the internal structure. The homogenization structure is used for establishing hexahedral grids, the grid model is required to ensure that the thickness direction is not less than three layers of grids, the height and width direction grid sizes are determined on the premise that the side length ratio of the hexahedral grids is not more than 10, and the grids are shown in an opinion figure 4;

(4) A soft cushion;

the soft cushion between the electric cores refers to a real structure, performs proper geometric simplification, simplifies the structure into a regular cuboid, then performs finite element modeling, and establishes a hexahedral unit and a 1-layer grid in the thickness direction. Grid opinion fig. 5;

the cushion stiffness between the cells is generally small in order to absorb the expansion and deformation of the cells. If the physical units are directly defined according to the common method and the material parameters are given, the model is difficult to converge or is not converged due to the situations that the soft cushion is compressed and deformed greatly and even the grid penetrates frequently in calculation.

To improve this, the cushion was simulated here using a gasset unit.

(5) Simulating an energy absorption gap between the electric cores; in order to improve the energy absorption effect, an energy absorption gap is directly designed between part of the battery cells.

If the contact relation is directly defined, the calculation convergence is poor or even not converged due to the fact that the initial contact relation is difficult to establish.

The gap area is assumed here to be an air cushion of minimal stiffness and is simulated using a gasset unit. The specific method comprises the following steps: finite element modeling of the air cushion between the cells is performed, hexahedral cells are built, the grid is 1 layer in the thickness direction, and the grid is shown in fig. 6. The type is defined as a gasset unit.

2. And (3) model assembly and determination:

(1) Cell housing and inside homogenization structure of cell:

(2) Soft cushion is arranged between the electric cores:

(3) The energy absorption gap is arranged between the battery cells:

the air cushions are respectively defined as small slip contacts with the cell housing. Model assembly shows figure 7.

3. Material property definition:

(1) Battery core shell

The cell shell material is aluminum alloy, and the elastic modulus E=70000 MPa and Poisson's ratio mu=0.3.

(2) Internal homogenizing structure of battery

The cell expansion here was simulated using an internal homogenisation structure to thermally expand.

The elastic modulus E, poisson's ratio mu and thermal expansion coefficient alpha of the homogenized material inside the cell are defined. Since expansion is mainly performed in the X direction, and the X-direction expansion load has a large influence and the X and Z-directions have a small influence, the Y-direction and Z-direction expansion coefficients of the homogenized material are defined as 0, the Z-direction expansion coefficients are defined as 2.0E-6, and the expansion load is defined together with the homogenized part temperature load in the subsequent simulation analysis. Mu is defined as 0.4.

The cell expansion mainly occurs in the X direction, the Y' and Z deformation have little influence, and the Y-direction elastic modulus E is assumed _y Modulus of elasticity E in Z direction _z Modulus of elasticity E in X direction _x The same applies. E (E) _x The determination can be made by a method of expansion test in combination with simulation analysis.

The elastic modulus of the internal homogenized part of the battery cell is 34MPa.

(3) Cushion between battery cells

The cushion thickness was 1.2mm, and the compression load-deformation parameters per unit area are shown in table 1:

table 1 shows compression load per unit area and deformation parameters

The gasket cell properties of the simulated cushion are defined as follows:

*GASKET SECTION,ELSET＝test1,BEHAVIOR＝test2

0.5,0.0,

*GASKET BEHAVIOR,NAME＝test2

*GASKET ELASTICITY,COMPONENT＝00000TRANSVERSE SHEAR

1

*GASKET ELASTICITY,COMPONENT＝MEMBRANE

1,0.1

*GASKET THICKNESS BEHAVIOR,TYPE＝DAMAGE,VARIABLE＝STRESS,DIRECTION＝LOADING

0.00,0.0

0.85,0.1

1.55,0.2

2.37,0.3

3.88,0.4

7.32,0.4999

10000,0.5

in the thickness interval of the soft cushion, the gasset unit compresses according to the actual stiffness curve; when the thickness is compressed to the limit, the rigidity of the unit is increased sharply, so that the load is transmitted according to the real rigidity, and the model is not converged due to the gasset unit characteristic and the excessive compression deformation of the unit.

(4) Energy absorption gap between battery cells

The gap thickness is 1.2mm, and the air cushion gasset unit attribute simulating the energy absorption gap between the electric cores is defined as follows:

*GASKET SECTION,ELSET＝jianxi,BEHAVIOR＝be-jianxi

1.2,0.0,

*GASKET BEHAVIOR,NAME＝be-jianxi

*GASKET ELASTICITY,COMPONENT＝TRANSVERSE SHEAR

0.1

*GASKET ELASTICITY,COMPONENT＝MEMBRANE

0.1,0.001

*GASKET THICKNESS BEHAVIOR,TYPE＝DAMAGE,VARIABLE＝STRESS,DIRECTION＝LOADING

0.0,0.0

0.0001,1.1999

100.0,1.2

in the thickness interval of the air cushion, the gasset unit compresses according to extremely small rigidity; when the energy absorption space is compressed to the limit of the energy absorption space gap, the rigidity of the units is increased sharply, so that the load is transmitted according to the real rigidity, and the model is not converged due to the gasset unit characteristic and the overlarge compression deformation of the units.

Example 3

Fig. 8 is a schematic structural diagram of a computer device in embodiment 4 of the present application. FIG. 8 illustrates a block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present application. The computer device 12 shown in fig. 8 is merely an example and should not be construed as limiting the functionality and scope of use of embodiments of the present application.

As shown in FIG. 8, the computer device 12 is in the form of a general purpose computing device. Components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.

Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, and a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, micro channel architecture (MAC) bus, enhanced ISA bus, video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

Computer device 12 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.

The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and/or cache memory 32. The computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 3, commonly referred to as a "hard disk drive"). Although not shown in fig. 3, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the application.

A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods of the embodiments described herein.

The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), one or more devices that enable a user to interact with the computer device 12, and/or any devices (e.g., network card, modem, etc.) that enable the computer device 12 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. In addition, in the computer device 12 of the present embodiment, the display 24 is not present as a separate body but is embedded in the mirror surface, and the display surface of the display 24 and the mirror surface are visually integrated when the display surface of the display 24 is not displayed. Moreover, computer device 12 may also communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet, through network adapter 20. As shown, network adapter 20 communicates with other modules of computer device 12 via bus 18. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with computer device 12, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.

The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, for example, implementing the cell structure modeling method in the new energy battery expansion simulation provided by the embodiment of the present application.

Example 4

Embodiment 4 of the present application provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for modeling a cell structure in a new energy battery expansion simulation as provided in all embodiments of the present application.

Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).

The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.

In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Moreover, any combination of the various embodiments of the application can be made without departing from the spirit of the application, which should also be considered as disclosed herein.

Claims

1. The cell structure modeling method in the new energy battery expansion simulation is characterized by comprising the following steps of:

s1, finite element modeling of a cell expansion simulation key structure;

s2, model assembly definition;

s3, defining parameters of structural materials of each part;

and S4, completing the cell expansion simulation modeling.

2. The method for modeling a cell structure in a new energy battery expansion simulation according to claim 1, wherein in step S1, the cell shell finite element modeling specifically includes the following steps:

3. The method for modeling a cell structure in a new energy battery expansion simulation according to claim 1, wherein in step S1, the cell internal structure finite element modeling specifically includes the following steps:

4. The method for modeling a cell structure in a new energy battery expansion simulation according to claim 1, wherein in step S1, the cushion finite element modeling is performed by using a gasset unit, and the gasset unit attribute parameters are defined according to the characteristics of the cell expansion simulation model, the cushion thickness and the cushion compression characteristic curve.

5. The method for modeling a cell structure in a new energy battery expansion simulation according to claim 1, wherein in step S1, the soft pad finite element modeling specifically includes the following steps:

6. The method for modeling a cell structure in a new energy battery expansion simulation according to claim 1, wherein in step S2, the model assembly definition specifically includes:

A. for the cell housing and cell internal homogenization structure:

B. there is the cushion to the electricity between the core:

C. the energy absorption gap is formed between the battery cells:

7. The method for modeling a cell structure in expansion simulation of a new energy battery as defined in claim 1, wherein in step S3, each part of structural material parameter definition specifically includes:

A. cell housing:

B. cell internal homogenization structure:

C. cushion between electric core:

D. energy absorption gaps among the electric cores.

8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of cell structure modeling in a new energy battery expansion simulation as claimed in any one of claims 1 to 7 when the program is executed.

9. A computer readable storage medium according to claim 1, characterized in that a computer program is stored thereon, which program, when being executed by a processor, implements the cell structure modeling method in the new energy battery expansion simulation according to any one of claims 1-7.