Electrochemical-mechanical multi-physics field coupling method and device for battery

Abstract

The embodiment of the invention provides a battery electrochemical-mechanical multi-physics field coupling method and device. The method includes; constructing a gradient weighted smooth domain based on the battery data; based on the gradient weighted smooth domain, respectively constructing an equation weak form of an electrochemical field and an equation weak form of a mechanical field; and based on the weak equation form of the electrochemical field and the weak equation form of the mechanical field, constructing a coupling relationship between the electrochemical field and the mechanical field. In this way, the numerical defect that a finite element algorithm is low in calculation precision can be overcome, higher calculation precision can be obtained by adopting the low-order tetrahedron units, and calculation time is greatly shortened while the calculation precision is guaranteed.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of data processing, and particularly to a battery electrochemistry-mechanics multi-physical field coupling method and device. Background Art

[0002] Computational accuracy and efficiency are important challenges faced by the electrochemical-mechanics multi-physical field coupling simulation analysis of non-linear transient lithium batteries.

[0003] Currently, for the non-linear transient electrochemistry-mechanics multi-field coupling simulation analysis in the field of lithium batteries, the traditional finite element method is usually adopted. The coupling method usually uses the strong coupling of assembling the electrochemical field and mechanics based on the same element stiffness matrix, or separately calculates the electrochemical field and the mechanics field, and then transfers the coupling variables in the form of external forces for coupling. This coupling method is not only restricted by the inherent problems of low computational accuracy and low computational efficiency of the finite element method, but also will suffer from non-linear non-convergence, excessive iteration times, etc. brought by strong coupling or weak coupling. Summary of the Invention

[0004] According to the embodiments of the present application, a lithium battery electrochemistry-mechanics multi-field coupling scheme based on a gradient weighted algorithm is provided, which can solve the numerical defect of low computational accuracy of the finite element algorithm, and can obtain higher computational accuracy by using low-order tetrahedral elements, and greatly reduces the computational time while ensuring the computational accuracy; it can be applied to the electrochemistry-mechanics coupling simulation scenario in the electrode particle-cell multi-scale scenario.

[0005] In the first aspect of the present application, a battery electrochemistry-mechanics multi-physical field coupling method is provided. The method includes: Obtain battery data to be processed; Based on the battery data, construct a gradient weighted smoothing domain; Based on the gradient weighted smoothing domain, respectively construct the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanics field; Based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanics field, construct the coupling relationship between the electrochemical field and the mechanics field.

[0006] Further, the constructing a gradient weighted smoothing domain based on the battery data includes: Based on the battery data, discretize the battery solution domain into background grid cells in the shape of linear triangles and / or linear tetrahedrons; Set the triangles and / or tetrahedron units in the background grid as main units; set the adjacent units sharing the same edge or the same face with the main unit as auxiliary units, and construct a gradient weighted smoothing domain.

[0007] Further, the constructing the weak form of the equation of the electrochemical field based on the gradient weighted smoothing domain includes: ; ; ; ; wherein, N i represents the shape function of the i-node in the gradient weighted domain; N j represents the shape function of the j-node in the gradient weighted domain; c s and c l respectively represent the concentration field variables in the electrode region and the electrolyte region; D s and D e respectively represent the concentration diffusion coefficients in the electrode region and the electrolyte region; k eff represents the ionic conductivity in the electrolyte region; and respectively represent the electrode potential and the electrolyte potential; represents the gradient weighted smooth integration domain; represents the electrode region conductivity; represents the material parameter at the electrode; represents the external force coupling term of the electric field; represents the external force coupling term of the concentration field; represents the partial derivative matrix of the composite shape function of the gradient weighted domain of node i; represents the partial derivative matrix of the composite shape function of the gradient weighted domain of node j; represents the concentration field variable in the electrolyte region at the previous time step; represents the material parameter at the electrolyte.

[0008] Furthermore, the partial derivative matrix of the composite shape function can be calculated in the following manner: ; wherein, w grrepresents the weighting factor of the composite gradient weighted smoothing domain; m represents the number of elements in the smoothing domain; represents the gradient operator symbol; N j represents the shape function of the j-node of the gradient weighted domain.

[0009] Furthermore, the weighting factor of the composite gradient weighted smoothing domain can be calculated in the following way: ; where, is the volume of the main element; is the volume of the auxiliary element; is the number of auxiliary elements.

[0010] Furthermore, constructing the weak form of the equation of the mechanical field based on the gradient weighted smoothing domain includes: ; where, u s represents the discrete element displacement vector; is the constitutive parameter of the mechanical material.

[0011] Furthermore, constructing the coupling relationship between the electrochemical field and the mechanical field based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field includes: Based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field, construct the single-field stiffness matrices of the electrochemical field and the mechanical field within the composite gradient smoothing domain; Based on the single-field stiffness matrices, construct the coupling relationship between the electrochemical field and the mechanical field.

[0012] In the second aspect of the present application, a battery electrochemistry-mechanics multi-physical field coupling device is provided. The device includes: An acquisition module for acquiring battery data to be processed; A first construction module for constructing a gradient weighted smoothing domain based on the battery data; A second construction module for respectively constructing the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field based on the gradient weighted smoothing domain; A coupling module for constructing the coupling relationship between the electrochemical field and the mechanical field based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field.

[0013] In a third aspect of the present application, an electronic device is provided. The electronic device includes: a memory and a processor, where a computer program is stored on the memory, and when the processor executes the program, the methods described above are implemented.

[0014] In a fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method according to the first aspect of the present application is implemented.

[0015] The battery electrochemistry-mechanics multi-physics field coupling method provided by the embodiments of the present application includes: obtaining battery data to be processed; based on the battery data, constructing a gradient-weighted smooth domain; based on the gradient-weighted smooth domain, respectively constructing a weak form of the equation of the electrochemical field and a weak form of the equation of the mechanics field; based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanics field, constructing a coupling relationship between the electrochemical field and the mechanics field, which can solve the numerical defect of low calculation accuracy of the finite element algorithm, and higher calculation accuracy can be obtained by using low-order tetrahedral elements, and the calculation time is greatly reduced while ensuring the calculation accuracy.

[0016] It should be understood that the content described in the summary of the invention is not intended to limit the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In combination with the drawings and with reference to the following detailed description, the above and other features, advantages and aspects of the embodiments of the present application will become more obvious. In the drawings, the same or similar reference numerals represent the same or similar elements, where: Figure 1 is a flowchart of the battery electrochemistry-mechanics multi-physics field coupling method according to the embodiments of the present application; Figure 2 is a schematic diagram of a composite gradient-weighted smooth domain according to the embodiments of the present application; where, Figure 2 (a) is a schematic diagram of the background grid; Figure 2 (b) is a schematic diagram of the gradient smooth domain; Figure 3 is a block diagram of the battery electrochemistry-mechanics multi-physics field coupling device according to the embodiments of the present application; Figure 4 is a schematic diagram of the structure of a terminal device or a server suitable for implementing the embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0019] In addition, the term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0020] Figure 1 The flowchart of the battery electrochemistry-mechanics multi-physics field coupling method according to the embodiments of the present disclosure is shown. The method includes: S110, obtaining battery data to be processed.

[0021] In some embodiments, the battery data to be processed can be obtained by wired or wireless means; the battery data includes relevant data such as the battery solution domain.

[0022] S120, constructing a gradient-weighted smooth domain based on the battery data.

[0023] In some embodiments, as Figure 2 shown in (a), the battery solution domain is discretized into background grid cells in the shape of linear triangles and / or linear tetrahedrons. As Figure 2 shown in (b), the triangular or tetrahedral cells in the background grid are used as the main cells, and the adjacent cells sharing the same edge or the same face with the main cells are used as the auxiliary cells, thereby constructing a gradient smooth domain mainly composed of the main cells. Among them, the nodes in the smooth domain are jointly composed of the nodes of the main cells and the auxiliary cells, and then the node discretization information of the gradient smooth domain different from the background grid can be formed.

[0024] S130, respectively constructing the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field based on the gradient-weighted smooth domain.

[0025] Regarding the traditional electrochemical field and mechanical field, in view of the defect of using the finite element method to construct the element information and the element stiffness matrix (the overall stiffness matrix of the solution domain is "too rigid", resulting in low calculation accuracy of the linear tetrahedral elements), the present disclosure proposes an improved method for constructing the electrochemical field and the mechanical field based on the gradient-weighted element algorithm.

[0026] Specifically, based on the discrete information of the gradient-smooth domain, the weak forms of the equations for the electrochemical field and the mechanical field are constructed; based on the nodal shape functions of the shared gradient-smooth domain, the element stiffness matrices for the electrochemical field and the mechanical field are constructed: Among them, the weak form of the electrochemical field equation includes: ; ; ; ; Among them, N i represents the shape function of node i in the gradient-weighted domain; N j represents the shape function of node j in the gradient-weighted domain; c s and c l represent the concentration field variables in the electrode region and the electrolyte region, respectively; D s and D e represent the concentration diffusion coefficients in the electrode region and the electrolyte region, respectively; k eff represents the ionic conductivity of the electrolyte region; and represent the electrode potential and the electrolyte potential, respectively; represents the gradient-weighted smooth integration domain; represents the conductivity of the electrode region; represents the material parameter at the electrode; represents the external force coupling term of the electric field; represents the external force coupling term of the concentration field; represents the partial derivative matrix of the composite shape function of the gradient-weighted domain of node i; represents the partial derivative matrix of the composite shape function of the gradient-weighted domain of node j; represents the concentration field variable of the electrolyte region at the previous time step; represents the material parameter at the electrolyte.

[0027] Furthermore, the partial derivative matrix of the composite shape function within the above-mentioned gradient smoothing domain can be weighted and formed by the main element within the composite domain and the auxiliary elements adjacent to the main element by face or edge, that is: ; where m represents the number of elements in the smoothing domain; represents the gradient operator symbol; N j represents the shape function of the j node in the gradient weighting domain; w gr represents the weighting factor of the composite gradient weighting smoothing domain and can be expressed as: ; where, is the volume of the main element; is the volume of the auxiliary element; is the number of auxiliary elements; The weak form of the equation of the mechanical field includes: ; where u s represents the discrete element displacement vector; are the constitutive parameters of the mechanical material.

[0028] S140. Based on the weak forms of the equations of the electrochemical field and the mechanical field, construct the coupling relationship between the electrochemical field and the mechanical field.

[0029] In some embodiments, after constructing the electrochemistry-mechanics correction coupling model and constructing the staggered iteration stabilization process through step S130 to obtain the single-field stiffness matrices of the electrochemical field and the mechanical field within the composite gradient smoothing domain; the mutual coupling left-right relationship between the electrochemical field and the mechanical field can be further constructed.

[0030] Specifically, in the application scenario of the actual electrochemistry-mechanics coupling simulation analysis, the structural mechanics response speed far exceeds the electrochemical reaction. Therefore, it is first necessary to construct the key terms of the coupling and influence of the mechanical field on the electrochemical field within the composite gradient smoothing domain. It mainly includes the influence and correction of the mechanical response on the concentration mass transfer and the influence and correction of the mechanical response on the electrochemical reaction: ; ; where, and respectively represent the electrode potential and the electrolyte potential; ηgr represents the corrected overpotential within the gradient-weighted domain; R , T and F are the molar gas constant, temperature, and Faraday constant, respectively; E represents the unit equilibrium potential; α a , α c are the anodic and cathodic transfer numbers, respectively; represents the exchange current density; N represents the unit shape function; D s represents the concentration diffusion coefficient in the electrode region; n represents the number of electrons; molar volume; and represent the boundary domain and the gradient smoothing domain, respectively; represents the stress in the gradient-weighted domain; Furthermore, a coupling influence matrix of electrochemistry on the mechanical structure deformation is constructed. Considering the volume change of the whole battery caused by the insertion and extraction of lithium ions during the charge and discharge process of the lithium battery, the present disclosure can construct the coupling relationship between the electrochemical field and the mechanical structure deformation in the following manner: 1) Obtain the SOC state of the electrode region within the composite gradient smoothing domain; 2) Conduct a region search to obtain the average particle size of the electrode region or the average particle size of the electrode particles obtained based on the actual processing design process; slice the electrode region of the battery along the directions perpendicular to the thickness, height, and width of the battery cell with the average particle size of the electrode particles; 3) Based on the sliced region in step 2), loop through all the elements in this region, reconstruct the gradient-weighted subdomain within the sliced region, and calculate the SOC of the composite gradient-weighted domain through the composite gradient-weighted domain within the sliced region; 4) Based on the SOC, the average strain along the directions perpendicular to the thickness, height, and width of the battery cell in this sliced region can be calculated through the following formula: ; where, ε ave represents the average strain along the directions perpendicular to the thickness, height, and width of the battery cell in the sliced region; f iIt can be modified or interpolated based on experimental test parameters; 5) Apply the average strain to the mechanical field for coupled calculation.

[0031] In summary, the coupling relationship between the electrochemical field and the mechanical structure deformation can be obtained.

[0032] According to the embodiments of the present disclosure, the following technical effects are achieved: The problem of multi-field coupling of electrochemistry-mechanics faced in the simulation analysis of lithium batteries is solved with high efficiency and high precision by low-order linear elements.

[0033] The mutual coupling and interaction relationship between electrochemistry and mechanics is constructed within the composite gradient weighted smooth domain. Compared with the traditional finite element method based on element construction, it has higher coupling accuracy and convergence; By constructing the coupling effect of stress on mass transfer in the concentration field and electrode reaction kinetics (overpotential) based on the gradient weighted smooth domain, the calculation accuracy of the electrochemistry-mechanics simulation analysis of lithium batteries is greatly improved; In the sliced area, all elements in this area are cycled, the gradient weighted sub-domain within the sliced area is reconstructed, and the SOC of the composite gradient weighted domain is calculated through the composite gradient weighted domain within the sliced area to obtain the coupling effect of the electrochemical field on the mechanical field, improving the electrochemistry-mechanics coupling accuracy and the high-precision mapping from the electrode particle scale to the battery cell scale.

[0034] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0035] The above is the introduction of the method embodiments. The following further illustrates the solution of this application through device embodiments.

[0036] Figure 3 FIG. 300 shows a block diagram of a battery electrochemistry-mechanics multi-physical field coupling device according to an embodiment of the present application, as Figure 3 shown including: An acquisition module 310, configured to acquire battery data to be processed; A first construction module 320, configured to construct a gradient weighted smooth domain based on the battery data; A second construction module 330, configured to respectively construct a weak form of an equation of the electrochemical field and a weak form of an equation of the mechanical field based on the gradient weighted smooth domain; A coupling module 340, configured to construct a coupling relationship between the electrochemical field and the mechanical field based on the weak forms of the equations of the electrochemical field and the weak forms of the equations of the mechanical field.

[0037] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the described modules can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0038] Figure 4 The schematic diagram of the structure of a terminal device or a server suitable for implementing the embodiments of the present application is shown.

[0039] As Figure 4 shown, the terminal device or the server includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 402 or the program loaded from the storage section 408 into the random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the terminal device or the server are also stored. The CPU 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. The input / output (I / O) interface 405 is also connected to the bus 404.

[0040] The following components are connected to the I / O interface 405: an input section 406 including a keyboard, a mouse, etc.; an output section 407 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage section 408 including a hard disk, etc.; and a communication section 409 including a network interface card such as a LAN card, a modem, etc. The communication section 409 performs communication processing via a network such as the Internet. A drive 410 is also connected to the I / O interface 405 as required. A removable medium 411, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 410 as required so that a computer program read from it can be installed into the storage section 408 as required.

[0041] Specifically, according to the embodiments of the present application, the above method flow steps can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a machine-readable medium, and the computer program includes program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from the network through the communication section 409 and / or installed from the removable medium 411. When the computer program is executed by the central processing unit (CPU) 401, the above functions defined in the system of the present application are executed.

[0042] It should be noted that the computer-readable medium shown in this application can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of a computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, 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 disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this application, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. And in this application, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which computer-readable program code is carried. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on a computer-readable medium can be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0043] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram can represent a module, a program segment, or a part of code, and the foregoing module, program segment, or part of code contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks can occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0044] The units or modules involved in the embodiments described in this application can be implemented in software or in hardware. The described units or modules can also be provided in a processor. Among them, the names of these units or modules do not, in some cases, constitute a limitation on the units or modules themselves.

[0045] As another aspect, this application also provides a computer-readable storage medium, which may be included in the electronic device described in the above embodiments; or may exist separately without being assembled into the electronic device. The above computer-readable storage medium stores one or more programs, and when the foregoing programs are executed by one or more processors, the methods described in this application are implemented.

[0046] The above description is only a preferred embodiment of this application and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the application involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the foregoing application concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions described in this application.

Claims

1. A battery electrochemistry-mechanics multi-physics field coupling method, characterized in that, Including: Obtain battery data to be processed; Based on the battery data, construct a gradient-weighted smoothing domain; Based on the gradient-weighted smoothing domain, respectively construct the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field; Based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field, construct the coupling relationship between the electrochemical field and the mechanical field.

2. The method according to claim 1, wherein The constructing a gradient-weighted smoothing domain based on the battery data includes: Based on the battery data, discretize the battery solution domain into background grid cells in the shape of linear triangles and / or linear tetrahedrons; Set the triangles and / or tetrahedron cells in the background grid as the main cells; set the adjacent cells sharing the same edge or the same face with the main cells as the auxiliary cells, and construct a gradient-weighted smoothing domain.

3. The method according to claim 2, wherein The constructing the weak form of the equation of the electrochemical field based on the gradient-weighted smoothing domain includes: ； ； ； ； Wherein, N i The shape function of the i-node representing the gradient weighted domain; N j The shape function of node j representing the gradient-weighted domain; c s and c l represent the concentration field variables of the electrode region and the electrolyte region, respectively; D s and D e represent the concentration diffusion coefficients of the electrode region and the electrolyte region, respectively; k eff represents the ionic conductivity of the electrolyte region; and are represented as the electrode potential and the electrolyte potential, respectively; Indicates a gradient-weighted smooth integration domain; Indicates the conductivity of the electrode region; represent the material parameters at the electrode; The external force coupling term representing the electric field; The external force coupling term representing the concentration field; The partial derivative matrix of the complex function representing the gradient weighted domain of node i; The partial derivative matrix of the complex function representing the gradient weighted domain of node j; The concentration field variable representing the electrolyte region at the previous time step; Indicates the material parameters at the electrolyte.

4. The method according to claim 3, wherein The partial derivative matrix of the composite shape function can be calculated in the following way: ； where, w gr represents the weighting factor of the composite gradient weighted smoothing domain; m represents the number of cells in the smoothing domain; Denotes the gradient operator symbol; N j representing the gradient-weighted domain j nodal shape functions 5. The method according to claim 4, characterized in that, The weighting factor of the composite gradient-weighted smoothing domain can be calculated in the following way: ； Among them, is the main unit volume; is the volume of the auxiliary unit; is the number of auxiliary units.

6. The method according to claim 5, characterized in that The constructing the weak form of the equation of the mechanical field based on the gradient-weighted smoothing domain includes: ； where u s represents the displacement vector of the discrete element; are the constitutive parameters of mechanical materials.

7. The method according to claim 6, wherein The constructing the coupling relationship between the electrochemical field and the mechanical field based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field includes: Based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field, construct the single-field stiffness matrices of the electrochemical field and the mechanical field in the composite gradient smoothing domain; Based on the single-field stiffness matrices, construct the coupling relationship between the electrochemical field and the mechanical field.

8. An electrochemical-mechanical multi-physical field coupling device for a battery, characterized in that, Including: An obtaining module, configured to obtain battery data to be processed; A first constructing module, configured to construct a gradient-weighted smoothing domain based on the battery data; A second constructing module, configured to respectively construct the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field based on the gradient-weighted smoothing domain; A coupling module, configured to construct the coupling relationship between the electrochemical field and the mechanical field based on the weak form of the equation of the electrochemical field and the weak form of the equation of the mechanical field.

9. An electronic device, comprising a memory and a processor, wherein a computer program is stored on the memory, characterized in that When the processor executes the computer program, it implements the method according to any one of claims 1 to 7.

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

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