Method and device for simulating pre-tightening assembly working condition of solid-state battery module
By constructing a mesh model of the pre-tightening assembly condition and conducting simulation, the problems of high cost and long cycle in the assembly process of solid-state battery modules under high pre-tightening force were solved, the structural design was optimized and the simulation accuracy was improved, and the R&D cost was reduced.
Patent Information
- Application Number
- CN202511348974.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2025-11-21
AI Technical Summary
Existing solid-state battery module structural designs are costly, time-consuming, and risky during pre-tightening assembly, and cannot effectively meet high pre-tightening requirements while reducing the impact on other components.
By constructing a mesh model of the pre-tight assembly condition, the material properties of each component are determined, and the contact settings and simulation convergence control of the pre-tight assembly condition are implemented. The output control information is then analyzed to evaluate the simulation performance.
It improves the R&D efficiency of solid-state battery module structure design, reduces R&D costs, ensures simulation accuracy and reliability, and optimizes module structure.
Smart Images
Figure CN120995791A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of solid-state battery operating condition simulation technology, and in particular to a method and apparatus for simulating the pre-tightening assembly operating condition of a solid-state battery module. Background Technology
[0002] Currently, there are still many challenges to overcome in the research and development of solid-state batteries. One of them is how to rationally design the module structure so that it can withstand and maintain the high preload generated during assembly.
[0003] Solid-state batteries typically require several to tens of times higher preload than traditional liquid batteries (applying mechanical pressure (preload) to the battery during assembly can improve its energy density and cycle stability). This ultra-high preload not only means that solid-state batteries are more difficult to assemble, but also necessitates consideration of the impact of this high preload on other components of the battery pack. The challenge lies in meeting the preload requirements of solid-state batteries while minimizing its impact on other components to ensure the overall structural rigidity and strength of the battery pack.
[0004] However, the current approach of relying solely on experimentation with different structural solutions is not only costly and time-consuming, but also carries significant risks, which urgently need to be addressed. Summary of the Invention
[0005] This application provides a simulation method and apparatus for pre-tightening assembly of solid-state battery modules to solve the problems of existing methods that rely solely on experimentation to try different structural solutions, which are not only costly and have long development cycles, but also carry high risks.
[0006] The first aspect of this application provides a simulation device for pre-tightening assembly conditions of a solid-state battery module, comprising the following steps: constructing a pre-tightening assembly condition mesh model corresponding to a target solid-state battery module, and determining the material properties of each component in the pre-tightening assembly condition mesh model; setting the pre-tightening assembly condition contact for the target solid-state battery module based on a preset pre-tightening assembly condition contact method, and determining the condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module, and performing simulation convergence control operations based on the condition boundary and the load data to obtain corresponding simulation convergence parameters; controlling the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operations based on the simulation convergence parameters to output multiple corresponding control information, analyzing the multiple control information to obtain corresponding analysis data, and evaluating the pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model based on the analysis data.
[0007] Based on the above technical means, the embodiments of this application simulate the entire process of pre-tightening assembly of solid-state battery modules to analyze the stress situation of solid-state battery module structure under pre-tightening force assembly conditions, thereby guiding and optimizing the design of solid-state battery module structure, improving the efficiency of solid-state battery R&D and reducing R&D costs.
[0008] Optionally, in one embodiment of this application, the step of constructing a pre-tightened assembly condition mesh model corresponding to the target solid-state battery module and determining the material properties of each component in the pre-tightened assembly condition mesh model includes: determining the construction principle of the pre-tightened assembly condition mesh model, and constructing the pre-tightened assembly condition mesh model corresponding to the target solid-state battery module based on the construction principle of the pre-tightened assembly condition mesh model; determining the material properties of the buffer pad component in the pre-tightened assembly condition mesh model through a preset hyperelastic material, and determining the elastic modulus, Poisson's ratio, coefficient of thermal expansion, and material coordinate system of a preset single cell; and determining the material properties of the cable tie through a preset orthogonal anisotropic material, and determining the elastic modulus, Poisson's ratio, and material orientation of the cable tie.
[0009] Based on the above technical means, the embodiments of this application construct a pre-tightening assembly condition mesh model and determine the material properties corresponding to each component in the pre-tightening assembly condition mesh model, thereby making the mesh model construction comprehensive and accurate, ensuring the accuracy of simulation, and the material property definition fits the characteristics of the components, especially adapting to the stress requirements of key components such as cable ties, providing scientific and standardized technical support for the simulation of pre-tightening assembly conditions of solid-state battery modules, and improving the reliability of simulation.
[0010] Optionally, in one embodiment of this application, determining the working condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module, and performing simulation convergence control operations based on the working condition boundary and the load data to obtain the corresponding simulation convergence parameters, includes: setting an initial step and multiple load steps to assign basic temperature values to all cell nodes in the pre-tightening assembly condition mesh model in the preset initial step, and performing module compression, module springback, cable tie fastening, correct cell expansion, and cell expansion through the multiple load steps; and determining the working condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module based on the initial step and the multiple load steps; adjusting the initial increment step and minimum increment step in the initial step, and turning on the target deformation switch corresponding to all load steps, while simultaneously turning on contact control to perform simulation convergence control operations to obtain the corresponding simulation convergence parameters.
[0011] Based on the above technical means, the embodiments of this application ensure accurate contact simulation by setting contact settings that conform to the actual assembly sequence and component characteristics, and plan multi-load steps that cover key working conditions to meet the integrity of the simulation. Furthermore, through simulation convergence control, the convergence control parameters are made reasonable, effectively improving the stability of the simulation.
[0012] Optionally, in one embodiment of this application, the step of controlling the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operation based on the simulation convergence parameters to output multiple corresponding control information, and analyzing the multiple control information to obtain corresponding analysis data, and evaluating the pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model based on the analysis data, includes: controlling the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operation based on the simulation convergence parameters to output multiple corresponding control information, wherein the multiple control information includes displacement, stress, contact surface pressure, automatic contact dissipation energy, and total internal energy; and evaluating the pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model based on preset finite element software. Multiple control information is statically solved to obtain the analysis data. Based on the analysis data, it is determined whether the ratio of the automatic contact dissipation energy to the total internal energy in the multiple control information is less than a preset ratio threshold. If the ratio of the automatic contact dissipation energy to the total internal energy is greater than or equal to the preset ratio threshold, the contact control parameters corresponding to the pre-tight assembly condition mesh model and the pre-tight assembly condition contact mode are adjusted. Based on the multiple control information, it is determined whether other control information in the multiple control information meets the corresponding control requirements to obtain the corresponding judgment result. Based on the judgment result, the pre-tight assembly condition simulation performance of the pre-tight assembly condition mesh model is evaluated.
[0013] Based on the above technical means, the embodiments of this application can realize the simulation of the entire pre-tightening assembly process of solid-state battery modules, so as to analyze the stress situation of the solid-state battery module structure under the pre-tightening force assembly condition, thereby guiding and optimizing the solid-state battery module structure design, improving the efficiency of solid-state battery R&D, and reducing R&D costs.
[0014] A second aspect of this application provides a simulation device for pre-tightening assembly conditions of a solid-state battery module, comprising: a modeling module for constructing a pre-tightening assembly condition mesh model corresponding to a target solid-state battery module and determining the material properties of each component in the pre-tightening assembly condition mesh model; a simulation control module for setting the pre-tightening assembly condition contact of the target solid-state battery module based on a preset pre-tightening assembly condition contact method, determining the condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module, and performing simulation convergence control operations based on the condition boundary and the load data to obtain corresponding simulation convergence parameters; and an analysis module for controlling the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operations based on the simulation convergence parameters, outputting multiple corresponding control information, analyzing the multiple control information to obtain corresponding analysis data, and evaluating the pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model based on the analysis data.
[0015] Optionally, in one embodiment of this application, the modeling module includes: a first determining unit, configured to determine the construction principle of the pre-tight assembly condition mesh model, and construct the pre-tight assembly condition mesh model corresponding to the target solid-state battery module based on the construction principle of the pre-tight assembly condition mesh model; and a second determining unit, configured to determine the material properties corresponding to the buffer pad component in the pre-tight assembly condition mesh model through a preset hyperelastic material, and determine the elastic modulus, Poisson's ratio, coefficient of thermal expansion and material coordinate system of a preset single cell, and determine the material properties corresponding to the preset cable tie through a preset orthogonal anisotropic material, and determine the elastic modulus, Poisson's ratio and material orientation of the cable tie.
[0016] Optionally, in one embodiment of this application, the simulation control module includes: a setting unit, configured to set an initial step and multiple load steps, to assign base temperature values to all cell nodes in the pre-tightened assembly condition mesh model in the preset initial step, and to perform module compression, module springback, cable tie fastening, correct cell expansion, and cell expansion through the multiple load steps, and to determine the condition boundary and load data of the pre-tightened assembly condition corresponding to the target solid-state battery module based on the initial step and the multiple load steps; and an activation unit, configured to adjust the initial increment step and the minimum increment step in the initial step, and to activate the target deformation switch corresponding to all load steps, while activating contact control to perform simulation convergence control operations and obtain the corresponding simulation convergence parameters.
[0017] Optionally, in one embodiment of this application, the analysis module includes: an output unit, configured to control the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operation according to the simulation convergence parameters, so as to output a plurality of corresponding control information, wherein the plurality of control information includes displacement, stress, contact surface pressure, automatic contact dissipation energy, and total internal energy; a solution unit, configured to perform static solution on the plurality of control information based on preset finite element software to obtain the analysis data, and determine whether the ratio of the automatic contact dissipation energy to the total internal energy in the plurality of control information is less than a preset ratio threshold, wherein if the ratio of the automatic contact dissipation energy to the total internal energy is greater than or equal to the preset ratio threshold, the contact control parameters corresponding to the contact mode of the pre-tightening assembly condition mesh model and the pre-tightening assembly condition are adjusted; and an evaluation unit, configured to determine whether other control information in the plurality of control information meets the corresponding control requirements based on the plurality of control information, so as to obtain the corresponding judgment result, and evaluate the pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model according to the judgment result.
[0018] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the solid-state battery module pre-tightening assembly simulation method as described in the above embodiments.
[0019] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described simulation method for pre-tightening assembly of a solid-state battery module.
[0020] A fifth aspect of this application provides a computer program product, including a computer program that is executed to implement the above-described simulation method for pre-tightening assembly of solid-state battery modules.
[0021] Therefore, the embodiments of this application have the following beneficial effects: The embodiments of this application construct a pre-tightening assembly condition mesh model corresponding to the target solid-state battery module and determine the material properties of each component in the pre-tightening assembly condition mesh model. Based on a preset pre-tightening assembly condition contact method, the pre-tightening assembly condition contact setting is performed on the target solid-state battery module, and the condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module are determined. Simulation convergence control operations are performed based on the condition boundary and load data to obtain corresponding simulation convergence parameters. Based on the simulation convergence parameters, the pre-tightening assembly condition mesh model is controlled to perform pre-tightening assembly condition simulation operations to output multiple corresponding control information. These multiple control information are analyzed to obtain corresponding analysis data, and the pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model is evaluated based on the analysis data. This application, through simulation of the entire pre-tightening assembly process of a solid-state battery module, analyzes the stress situation of the solid-state battery module structure under pre-tightening force assembly conditions, thereby guiding and optimizing the solid-state battery module structure design, improving solid-state battery R&D efficiency, and reducing R&D costs. This solves the problems of existing methods that rely solely on experimentation with different structural solutions, which are not only costly and time-consuming but also carry high risks.
[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating a simulation method for pre-tightening assembly of a solid-state battery module according to an embodiment of this application. Figure 2 A schematic diagram of a solid-state battery module pre-tightening assembly condition model provided in this application embodiment; Figure 3 A schematic diagram of cable tie partitioning provided in an embodiment of this application; Figure 4 A schematic diagram of a cable tie mesh provided in an embodiment of this application; Figure 5 A schematic diagram of the mesh in the contact area of an end plate provided in an embodiment of this application; Figure 6 A schematic diagram of a clamp grid provided in an embodiment of this application; Figure 7 This application provides a schematic diagram of a grid for a battery cell, a buffer pad, etc., as an embodiment of the present application. Figure 8 This application provides a schematic diagram of a coordinate system for horizontally arranged cable tie materials. Figure 9 This is a schematic diagram of a coordinate system for a rounded corner arrangement of cable ties, provided in an embodiment of this application. Figure 10 This is a schematic diagram of the execution logic of a simulation method for pre-tightening assembly of a solid-state battery module provided in an embodiment of this application; Figure 11 This is an example diagram of a simulation device for pre-tightening assembly of a solid-state battery module according to an embodiment of this application; Figure 12 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.
[0024] Among them, 10-Solid-state battery module pre-tightening assembly simulation device; 100-Modeling module, 200-Simulation control module, 300-Analysis module; 1201-Memory, 1202-Processor, 1203-Communication interface. Detailed Implementation
[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0026] The following describes a simulation method and apparatus for pre-tightening assembly conditions of a solid-state battery module according to embodiments of this application, with reference to the accompanying drawings. Addressing the problems mentioned in the background section, this application provides a simulation method for pre-tightening assembly conditions of a solid-state battery module. In this method, a pre-tightening assembly condition mesh model corresponding to the target solid-state battery module is constructed, and the material properties of each component in the mesh model are determined. Based on a preset pre-tightening assembly condition contact method, a pre-tightening assembly condition contact setting is performed on the target solid-state battery module, and the working boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module are determined. Simulation convergence control operations are performed based on the working boundary and load data to obtain corresponding simulation convergence parameters. Based on the simulation convergence parameters, the pre-tightening assembly condition mesh model is controlled to perform pre-tightening assembly condition simulation operations to output multiple corresponding control information. These multiple control information are analyzed to obtain corresponding analysis data, and the simulation performance of the pre-tightening assembly condition mesh model is evaluated based on the analysis data. This application uses simulation of the entire pre-tightening assembly process of solid-state battery modules to analyze the stress on the solid-state battery module structure under pre-tightening force assembly conditions. This analysis guides and optimizes the design of solid-state battery module structures, improving the efficiency of solid-state battery R&D and reducing R&D costs. Therefore, it solves the problems of existing methods that rely solely on experimental trials of different structural solutions, which are not only costly and time-consuming but also carry high risks.
[0027] Specifically, Figure 1 This is a flowchart illustrating a simulation method for pre-tightening assembly of a solid-state battery module, provided as an embodiment of this application.
[0028] like Figure 1 As shown, the simulation method for the pre-tight assembly condition of the solid-state battery module includes the following steps: In step S101, a pre-tight assembly condition mesh model corresponding to the target solid-state battery module is constructed, and the material properties of each component in the pre-tight assembly condition mesh model are determined.
[0029] The embodiments of this application first establish a pre-tight assembly condition mesh model of the solid-state battery module, and define the material properties of each component in the pre-tight assembly condition mesh model, thereby providing reliable data guidance and basis for subsequent simulation calculations.
[0030] Optionally, in one embodiment of this application, a pre-tightening assembly condition mesh model corresponding to the target solid-state battery module is constructed, and the material properties of each component in the pre-tightening assembly condition mesh model are determined, including: determining the construction principle of the pre-tightening assembly condition mesh model, and constructing the pre-tightening assembly condition mesh model corresponding to the target solid-state battery module based on the construction principle of the pre-tightening assembly condition mesh model; determining the material properties of the buffer pad component in the pre-tightening assembly condition mesh model through a preset hyperelastic material, and determining the elastic modulus, Poisson's ratio, coefficient of thermal expansion and material coordinate system of the preset single cell, and determining the material properties of the preset cable tie through a preset orthogonal anisotropic material, and determining the elastic modulus, Poisson's ratio and material orientation of the cable tie.
[0031] Figure 2 This is a schematic diagram of a solid-state battery module pre-tightening assembly model, illustrating the components involved, such as individual battery cells, buffer pads, end plates, fasteners (cable ties), and clamps. In the embodiments of this application, the entire simulation process of the solid-state battery module pre-tightening assembly is as follows: First, the right clamp is fixed, and the left clamp pushes the left end plate to compress the solid-state battery module until the outer side of the left end plate is finally inside the inner side of the cable tie (usually pushed a little further to facilitate the installation of the cable tie); after the cable tie is put on, the clamp is released, the module springs back and comes into contact with the cable tie, and the cable tie, under the reaction force of the module's springback, elongates to a certain extent and then fixes the module; finally, the solid-state battery cell expands during operation, causing the cable tie to elongate again.
[0032] Therefore, in the simulation of the pre-tight assembly condition of the solid-state battery module, the embodiments of this application can first establish a pre-tight assembly condition mesh model of the solid-state battery module according to the construction principle of the pre-tight assembly condition mesh model, wherein the construction principle of the pre-tight assembly condition mesh model is as follows: 1. A mesh model of all components included in the pre-tightening assembly of the solid-state battery module must be established, including individual cells, buffer pads, end plates, fasteners, clamps, etc. Among them, fasteners are components used to lock the pre-tightening force of the module, and can be any components used to tighten the pre-tightening force such as bolts or cable ties. The following embodiments of this application will use cable ties as an example for description. 2. The relative spatial positions of all component mesh models must be the initial spatial positions of the components when they are in operation throughout the entire pre-tightening assembly process, such as... Figure 2 As shown, regardless of whether a clamp or cable tie is used, the model is established at the initial position; 3. Components using orthotropic materials need to have their mesh models stored separately according to different material directions to facilitate the definition of material properties; furthermore, it must be ensured that the mesh models of different parts of the component are still connected by common nodes. In the embodiments of this application, cable ties can be made of orthotropic materials, such as... Figure 3 As shown, in this embodiment of the application, the cable ties can be divided into flat, vertical, and rounded sections according to the material direction, and the mesh can be stored in different components to facilitate the definition of material properties; 4. Grid division and size requirements: (1) All components must be symmetrically divided into 1 / 4 before meshing. After 1 / 4 of the mesh is divided, two symmetrical operations are used to complete the meshing of the entire component to ensure the symmetry and accuracy of the mesh. (2) Cable Ties: A first-order hexahedral grid (C3D8I) is used; the rounded corner area must be divided into at least 7 sections to represent the rounded corner features, and the size must not exceed 3mm; a transition area must be defined where the rounded corner connects to the flat band, with at least 3 sections in the transition area, and the mesh size must be consistent with that of the rounded corner area; the size of the remaining cable ties must not exceed 8mm. Figure 4 As shown; (3) End plate: Divided using (C3D10M) second-order tetrahedron; such as Figure 5 As shown, the contact area needs to be segmented to ensure the mesh quality of the contact area, and the global mesh size should not exceed 6mm; (4) Fixture: Uses (C3D8I) first-order hexahedral meshing, with a global mesh size not exceeding 6mm, such as... Figure 6 As shown; (5) Individual cells, buffer pads, etc.: A first-order hexahedral mesh (C3D8I) is used. Components with a thickness greater than 3mm require at least 3 mesh layers in the thickness direction, and components with a thickness less than 1mm require 1 mesh layer in the thickness direction. The mesh size in the length and width directions must be less than 6mm. The mesh nodes on the contact surfaces between individual cells, buffer pads, etc., must correspond one-to-one. Figure 7 As shown.
[0033] Furthermore, the material property definitions in this application embodiment are as follows: 1. As the main energy-absorbing compression deformation component, the buffer pad must be made of a hyperelastic material and its properties must be defined, with the property parameters derived from the test compression curve; 2. As the component that provides subsequent expansion force load, the single cell must define the coefficient of thermal expansion in addition to the elastic modulus and Poisson's ratio, and the material coordinate system must also be defined. 3. Cable ties, as components for locking preload, are subjected to enormous forces. They are made of high-strength composite materials, with strength in the primary stress direction being significantly higher than in other directions. Therefore, an orthotropic material definition is adopted, requiring the definition of elastic modulus, Poisson's ratio, and material orientation in three directions. The material orientation is defined according to the following principles: (1) For materials arranged horizontally or vertically, the material orientation must be defined using a rectangular coordinate system, such as Figure 8 As shown, direction 1 is the main tensile force direction; (2) For materials arranged with rounded corners, the material orientation needs to be defined using a cylindrical coordinate system, with the circumferential direction being the main tensile direction, such as... Figure 9 As shown.
[0034] 4. Apart from the components that require special definition as mentioned above, other components only require the definition of elastic modulus, Poisson's ratio, plasticity, and other material parameters, which can be added as needed.
[0035] Therefore, the embodiments of this application construct a pre-tightening assembly condition mesh model and determine the material properties corresponding to each component in the pre-tightening assembly condition mesh model, thereby making the mesh model construction comprehensive and accurate, ensuring the accuracy of the simulation, and the material property definition fits the characteristics of the components, especially adapting to the stress requirements of key components such as cable ties, providing scientific and standardized technical support for the simulation of pre-tightening assembly conditions of solid-state battery modules, and improving the reliability of the simulation.
[0036] In step S102, based on the preset pre-tightening assembly condition contact method, the pre-tightening assembly condition contact setting is performed on the target solid-state battery module, and the condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module are determined. Simulation convergence control operation is performed based on the condition boundary and load data to obtain the corresponding simulation convergence parameters.
[0037] Furthermore, such as Figure 10 As shown, the embodiments of this application can set the pre-tight assembly contact mode of the solid-state battery module according to the pre-tight assembly contact mode, and define the pre-tight assembly boundary and load of the solid-state battery module to perform simulation convergence control, thereby obtaining the corresponding simulation convergence parameters.
[0038] Optionally, in one embodiment of this application, the working condition boundary and load data of the pre-tight assembly condition corresponding to the target solid-state battery module are determined, and simulation convergence control operations are performed based on the working condition boundary and load data to obtain the corresponding simulation convergence parameters. This includes: setting an initial step and multiple load steps to assign the basic temperature values of all cell nodes in the pre-tight assembly condition mesh model in the preset initial step, and performing module compression, module springback, cable tie fastening, correct cell expansion, and cell expansion through multiple load steps; and determining the working condition boundary and load data of the pre-tight assembly condition corresponding to the target solid-state battery module based on the initial step and multiple load steps; adjusting the initial increment step and minimum increment step in the initial step, and turning on the target deformation switch corresponding to all load steps, while simultaneously turning on contact control to perform simulation convergence control operations to obtain the corresponding simulation convergence parameters.
[0039] Specifically, the contact setting process for the pre-tightening assembly of the solid-state battery module in this embodiment is as follows: 1. During the pre-tightening assembly process, the components around the solid-state battery cell, such as buffer pads and end plates, are in close contact, and contact must be established between the components; the components with high rigidity are used as the main surfaces, and the friction force is applied according to the actual situation. 2. The cable tie, which serves as the pre-tightening force, only begins to contact the end plate after the solid-state battery module has been pre-tightened and compressed and the clamps have been released. Therefore, it is required that the inner side of the cable tie and the outer side of the end plate be in contact. The cable tie serves as the main surface, and the friction force is applied according to the actual situation. 3. The fixture establishes contact with the end plate, with the fixture serving as the main surface, and the friction force is applied as needed.
[0040] Secondly, in order to realize the "typical actions" of assembly conditions such as module compression, springback, cable tie fastening, and module expansion in this embodiment of the application, one initial step and five load steps must be set, as described in the following formula: Initial step: In order to complete the cell expansion process, all cell nodes must be assigned a base temperature value in the initial step, which is recommended to be set to 20°. Loading Step 1: Inhibit the cable ties from contacting the end plate, rendering them ineffective in Loading Step 1. Fully constrain the right-side clamp and apply forced displacement in the compression direction to the left-side clamp, initiating pre-compression of the solid-state battery module. Ultimately, this ensures the outer side of the end plate is positioned inside the cable ties, with a certain installation allowance. This loading step achieves module compression. Load Step 2: Maintain the constraints from Load Step 1, then activate the cable tie contact with the end plate, allowing it to take effect in Load Step 2. Select the 1st degree of freedom of the row of nodes at the center of the cable tie and apply a forced displacement load to position the cable tie in the middle of the compressed module, ensuring that the inner sides of both cable ties are outside the outer sides of the end plate without any model interference. This load step ensures that the cable tie and end plate can make correct contact in Load Step 3 to achieve module springback. Load step 3: Lock the constraints in load step 2 (including the forced displacement boundary conditions for the cable ties), and then suppress the contact between the clamp mesh and the clamp and the end plate, rendering them ineffective in load step 3. This is equivalent to releasing the module and allowing it to spring back. This load step achieves both module springback and cable tie fastening. Load step 4: Reset all boundary constraints, only constrain the cable tie, select the row of nodes 1 at the center of the cable tie for degree of freedom, and apply a forced displacement load (which must be consistent with the forced displacement load in load step 2); this load step ensures the correct expansion of the cell in load step 5; Load step 5: Keeping the constraints of load step 4 unchanged, apply a temperature rise load (greater than the temperature of the initial step) to all cell nodes; this load step realizes cell expansion, and the expansion size can be controlled by the temperature rise.
[0041] Subsequently, the embodiments of this application can perform simulation convergence control operations, the specific process of which is as follows: 1. To ensure convergence, the initial increment step of load step 1 is set to 0.01, and the minimum increment step is set to 1e-7; 2. Turn on the large deformation switch and contact control at the same time for all load steps. This helps to improve convergence. The recommended control parameter is 0.05.
[0042] Therefore, the embodiments of this application ensure accurate contact simulation by setting contact parameters that conform to the actual assembly sequence and component characteristics, and perform multi-load step planning that covers key working conditions to meet the integrity of the simulation. Furthermore, through simulation convergence control, the convergence control parameters are made reasonable, effectively improving the stability of the simulation.
[0043] In step S103, based on the simulation convergence parameters, the pre-tight assembly condition mesh model is controlled to perform pre-tight assembly condition simulation operation to output multiple corresponding control information, and the multiple control information is analyzed to obtain corresponding analysis data. The simulation performance of the pre-tight assembly condition mesh model is evaluated based on the analysis data.
[0044] Subsequently, embodiments of this application can drive the pre-tight assembly condition mesh model to perform simulation based on the simulation convergence parameters, so as to output multiple control information and analyze the multiple control information to evaluate the simulation performance of the mesh model under the pre-tight assembly condition. Optionally, in one embodiment of this application, based on simulation convergence parameters, the pre-tightening assembly condition mesh model is controlled to perform pre-tightening assembly condition simulation operations to output multiple corresponding control information, and the multiple control information is analyzed to obtain corresponding analysis data. The pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model is evaluated based on the analysis data. This includes: controlling the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operations based on simulation convergence parameters to output multiple corresponding control information, wherein the multiple control information includes displacement, stress, contact surface pressure, automatic contact dissipation energy, and total internal energy; based on a preset finite element... The software performs static solutions on multiple control information to obtain analysis data. Based on the analysis data, it determines whether the ratio of automatic contact dissipation energy to total internal energy in the multiple control information is less than a preset proportional threshold. If the ratio of automatic contact dissipation energy to total internal energy is greater than or equal to the preset proportional threshold, the contact control parameters corresponding to the pre-tight assembly condition mesh model and the pre-tight assembly condition contact mode are adjusted. Based on multiple control information, it determines whether other control information in the multiple control information meets the corresponding control requirements to obtain the corresponding judgment results. Based on the judgment results, the simulation performance of the pre-tight assembly condition mesh model in the pre-tight assembly condition is evaluated.
[0045] It should be noted that the output of the simulation convergence control in this embodiment mainly includes the following: 1. The output results must include displacement, stress, and contact surface pressure; 2. After activating contact control, the automatic contact dissipation energy and total internal energy must be output.
[0046] Subsequently, embodiments of this application require the use of finite element software for static solutions, and the results are first checked. It is required that the ratio of automatic contact dissipation energy to total internal energy be less than 5%. Otherwise, the model and contact control parameters are adjusted until the ratio is <5%. Secondly, this application embodiment checks whether the component stress results meet the strength requirements, and checks whether the pressure on the cell contact surface meets the preload requirements; and then checks other results as needed.
[0047] Therefore, the embodiments of this application can simulate the entire pre-tightening assembly process of solid-state battery modules to analyze the stress situation of the solid-state battery module structure under pre-tightening force assembly conditions, thereby guiding and optimizing the solid-state battery module structure design, improving the efficiency of solid-state battery R&D, and reducing R&D costs.
[0048] The simulation method for pre-tightening assembly conditions of solid-state battery modules proposed in this application involves constructing a pre-tightening assembly condition mesh model corresponding to the target solid-state battery module and determining the material properties of each component within the mesh model. Based on a preset pre-tightening assembly condition contact method, the pre-tightening assembly condition contact settings are applied to the target solid-state battery module, and the boundary conditions and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module are determined. Simulation convergence control operations are then performed based on the boundary conditions and load data to obtain corresponding simulation convergence parameters. Based on these parameters, the pre-tightening assembly condition mesh model is controlled to perform pre-tightening assembly condition simulation operations, outputting multiple control information entries. These entries are then analyzed to obtain corresponding analysis data, and the simulation performance of the mesh model is evaluated based on the analysis data. This application simulates the entire pre-tightening assembly process of solid-state battery modules to analyze the stress state of the solid-state battery module structure under pre-tightening force assembly conditions, thereby guiding and optimizing the design of solid-state battery module structures, improving solid-state battery R&D efficiency, and reducing R&D costs.
[0049] Secondly, the simulation device for pre-tightening assembly of solid-state battery modules according to the embodiments of this application is described with reference to the accompanying drawings.
[0050] Figure 11 This is a block diagram of a simulation device for the pre-tightening assembly condition of a solid-state battery module according to an embodiment of this application.
[0051] like Figure 11 As shown, the solid-state battery module pre-tightening assembly simulation device 10 includes: a modeling module 100, a simulation control module 200, and an analysis module 300.
[0052] Among them, the modeling module 100 is used to construct the pre-tight assembly condition mesh model corresponding to the target solid-state battery module, and determine the material properties of each component in the pre-tight assembly condition mesh model.
[0053] The simulation control module 200 is used to set the pre-tightening assembly condition contact mode for the target solid-state battery module based on the preset pre-tightening assembly condition contact mode, determine the working condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module, and perform simulation convergence control operation based on the working condition boundary and load data to obtain the corresponding simulation convergence parameters.
[0054] The analysis module 300 is used to control the pre-tight assembly condition mesh model to perform pre-tight assembly condition simulation operation based on the simulation convergence parameters, so as to output multiple corresponding control information, analyze the multiple control information to obtain corresponding analysis data, and evaluate the pre-tight assembly condition simulation performance of the pre-tight assembly condition mesh model based on the analysis data.
[0055] Optionally, in one embodiment of this application, the modeling module 100 includes: a first determining unit and a second determining unit.
[0056] The first determining unit is used to determine the construction principle of the pre-tight assembly condition mesh model, and based on the construction principle of the pre-tight assembly condition mesh model, construct the pre-tight assembly condition mesh model corresponding to the target solid-state battery module.
[0057] The second determining unit is used to determine the material properties of the buffer pad component in the pre-tight assembly working condition mesh model through a preset hyperelastic material, and to determine the elastic modulus, Poisson's ratio, coefficient of thermal expansion and material coordinate system of the preset single cell. It also determines the material properties of the preset cable tie through a preset orthogonal anisotropic material, and to determine the elastic modulus, Poisson's ratio and material orientation of the cable tie.
[0058] Optionally, in one embodiment of this application, the simulation control module 200 includes a setting unit and an enabling unit.
[0059] The setting unit is used to set an initial step and multiple load steps, so as to assign the basic temperature values of all cell nodes in the pre-tight assembly condition mesh model in the preset initial step, and to perform module compression, module springback, cable tie fastening, correct cell expansion and cell expansion through multiple load steps. Based on the initial step and multiple load steps, the working condition boundary and load data of the pre-tight assembly condition corresponding to the target solid-state battery module are determined.
[0060] The activation unit is used to adjust the initial increment step and minimum increment step in the initial step, and to activate the target deformation switch corresponding to all load steps. At the same time, contact control is activated to perform simulation convergence control operations and obtain the corresponding simulation convergence parameters.
[0061] Optionally, in one embodiment of this application, the analysis module 300 includes: an output unit, a solution unit, and an evaluation unit.
[0062] The output unit is used to control the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operation according to the simulation convergence parameters, so as to output multiple control information, including displacement, stress, contact surface pressure, automatic contact dissipation energy and total internal energy.
[0063] The solver unit is used to perform static solutions on multiple control information based on preset finite element software to obtain analysis data. Based on the analysis data, it determines whether the ratio of automatic contact dissipation energy to total internal energy in the multiple control information is less than a preset proportional threshold. If the ratio of automatic contact dissipation energy to total internal energy is greater than or equal to the preset proportional threshold, the contact control parameters corresponding to the pre-tight assembly condition mesh model and the pre-tight assembly condition contact mode are adjusted.
[0064] The evaluation unit is used to determine whether other control information among multiple control information meets the corresponding control requirements based on multiple control information, so as to obtain the corresponding judgment result, and evaluate the simulation performance of the pre-tight assembly condition mesh model based on the judgment result.
[0065] It should be noted that the foregoing explanation of the simulation method embodiment for the pre-tightening assembly condition of solid-state battery modules also applies to the simulation device for the pre-tightening assembly condition of solid-state battery modules in this embodiment, and will not be repeated here.
[0066] The solid-state battery module pre-tightening assembly condition simulation device proposed in this application includes a modeling module 100, used to construct a pre-tightening assembly condition mesh model corresponding to the target solid-state battery module and determine the material properties of each component in the pre-tightening assembly condition mesh model; a simulation control module 200, used to set the pre-tightening assembly condition contact for the target solid-state battery module based on a preset pre-tightening assembly condition contact method, and determine the working boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module, and perform simulation convergence control operations based on the working boundary and load data to obtain the corresponding simulation convergence parameters; and an analysis module 300, used to control the pre-tightening assembly condition mesh model to perform pre-tightening assembly condition simulation operations based on the simulation convergence parameters, to output multiple corresponding control information, and analyze the multiple control information to obtain corresponding analysis data, and evaluate the pre-tightening assembly condition simulation performance of the pre-tightening assembly condition mesh model based on the analysis data. This application uses simulation of the entire pre-tightening assembly process of solid-state battery modules to analyze the stress on the solid-state battery module structure under pre-tightening force assembly conditions, thereby guiding and optimizing the design of solid-state battery module structures, improving the efficiency of solid-state battery R&D, and reducing R&D costs.
[0067] Figure 12 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 1201, the processor 1202, and the computer program stored on the memory 1201 and executable on the processor 1202.
[0068] When the processor 1202 executes the program, it implements the simulation method for the pre-tightening assembly condition of the solid-state battery module provided in the above embodiments.
[0069] Furthermore, electronic devices also include: Communication interface 1203 is used for communication between memory 1201 and processor 1202.
[0070] The memory 1201 is used to store computer programs that can run on the processor 1202.
[0071] The memory 1201 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage.
[0072] If the memory 1201, processor 1202, and communication interface 1203 are implemented independently, then the communication interface 1203, memory 1201, and processor 1202 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be divided into address buses, data buses, control buses, etc. For ease of representation, Figure 12 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.
[0073] Optionally, in a specific implementation, if the memory 1201, processor 1202, and communication interface 1203 are integrated on a single chip, then the memory 1201, processor 1202, and communication interface 1203 can communicate with each other through an internal interface.
[0074] The processor 1202 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.
[0075] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described simulation method for pre-tightening assembly of solid-state battery modules.
[0076] This application also provides a computer program product, including a computer program, which, when executed, is used to implement the above-described simulation method for pre-tightening assembly of solid-state battery modules.
[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0079] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.
[0080] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.
[0081] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0082] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
[0083] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0084] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
Claims
1. A simulation method for pre-tightening assembly of a solid-state battery module, characterized in that, Includes the following steps: Construct a pre-tight assembly condition mesh model corresponding to the target solid-state battery module, and determine the material properties of each component in the pre-tight assembly condition mesh model; Based on the preset pre-tightening assembly condition contact method, the target solid-state battery module is subjected to pre-tightening assembly condition contact settings, and the condition boundary and load data of the pre-tightening assembly condition corresponding to the target solid-state battery module are determined. Simulation convergence control operation is performed based on the condition boundary and the load data to obtain the corresponding simulation convergence parameters. Based on the simulation convergence parameters, the pre-tight assembly condition mesh model is controlled to perform pre-tight assembly condition simulation operations to output multiple corresponding control information, and the multiple control information is analyzed to obtain corresponding analysis data. The pre-tight assembly condition simulation performance of the pre-tight assembly condition mesh model is evaluated based on the analysis data.
2. The simulation method for pre-tightening assembly of solid-state battery modules according to claim 1, characterized in that, The construction of a pre-tightened assembly condition mesh model corresponding to the target solid-state battery module, and the determination of the material properties of each component in the pre-tightened assembly condition mesh model, include: The principles for constructing the mesh model for the pre-tight assembly condition are determined, and based on these principles, the mesh model for the pre-tight assembly condition corresponding to the target solid-state battery module is constructed. By using a preset hyperelastic material, the material properties of the buffer pad component in the pre-tightening assembly condition mesh model are determined, and the elastic modulus, Poisson's ratio, coefficient of thermal expansion, and material coordinate system of the preset single cell are determined. Furthermore, by using a preset orthogonal anisotropic material, the material properties of the preset cable tie are determined, and the elastic modulus, Poisson's ratio, and material orientation of the cable tie are determined.
3. The simulation method for pre-tightening assembly of solid-state battery modules according to claim 1, characterized in that, The process of determining the working condition boundary and load data of the pre-tight assembly condition corresponding to the target solid-state battery module, and performing simulation convergence control operations based on the working condition boundary and load data to obtain the corresponding simulation convergence parameters, includes: An initial step and multiple load steps are set to assign base temperature values to all cell nodes in the pre-tight assembly condition mesh model in the preset initial step, and module compression, module springback, cable tie fastening, correct cell expansion and cell expansion are performed through the multiple load steps. Based on the initial step and the multiple load steps, the condition boundary and load data of the pre-tight assembly condition corresponding to the target solid-state battery module are determined. Adjust the initial increment step and minimum increment step in the initial step, and turn on the target deformation switch corresponding to all load steps. At the same time, turn on the contact control to perform simulation convergence control operation and obtain the corresponding simulation convergence parameters.
4. The simulation method for pre-tightening assembly of solid-state battery modules according to claim 3, characterized in that, The step of controlling the pre-tight assembly condition mesh model to perform pre-tight assembly condition simulation operations based on the simulation convergence parameters, outputting multiple corresponding control information, analyzing the multiple control information to obtain corresponding analysis data, and evaluating the pre-tight assembly condition simulation performance of the pre-tight assembly condition mesh model based on the analysis data includes: The simulation convergence parameters are used to control the pre-tight assembly condition mesh model to perform pre-tight assembly condition simulation operations, so as to output multiple control information, including displacement, stress, contact surface pressure, automatic contact dissipation energy and total internal energy. Based on the preset finite element software, the multiple control information is statically solved to obtain the analysis data. Based on the analysis data, it is determined whether the ratio of the automatic contact dissipation energy to the total internal energy in the multiple control information is less than a preset ratio threshold. If the ratio of the automatic contact dissipation energy to the total internal energy is greater than or equal to the preset ratio threshold, the contact control parameters corresponding to the pre-tight assembly condition mesh model and the pre-tight assembly condition contact mode are adjusted. Based on the multiple control information, it is determined whether other control information among the multiple control information meets the corresponding control requirements, so as to obtain the corresponding judgment result, and the pre-tight assembly condition simulation performance of the pre-tight assembly condition mesh model is evaluated according to the judgment result.
5. A simulation device for pre-tightening assembly of a solid-state battery module, characterized in that, include: The modeling module is used to construct a pre-tight assembly condition mesh model corresponding to the target solid-state battery module, and to determine the material properties of each component in the pre-tight assembly condition mesh model. The simulation control module is used to set the pre-tight assembly contact mode for the target solid-state battery module based on a preset pre-tight assembly contact mode, determine the working boundary and load data of the pre-tight assembly condition corresponding to the target solid-state battery module, and perform simulation convergence control operation based on the working boundary and the load data to obtain the corresponding simulation convergence parameters. The analysis module is used to control the pre-tight assembly condition mesh model to perform pre-tight assembly condition simulation operation based on the simulation convergence parameters, so as to output multiple corresponding control information, analyze the multiple control information to obtain corresponding analysis data, and evaluate the pre-tight assembly condition simulation performance of the pre-tight assembly condition mesh model based on the analysis data.
6. The solid-state battery module pre-tightening assembly simulation device according to claim 5, characterized in that, The modeling module includes: The first determining unit is used to determine the construction principle of the pre-tight assembly condition mesh model, and construct the pre-tight assembly condition mesh model corresponding to the target solid-state battery module based on the construction principle of the pre-tight assembly condition mesh model. The second determining unit is used to determine the material properties of the buffer pad component in the pre-tightening assembly condition mesh model through a preset hyperelastic material, and to determine the elastic modulus, Poisson's ratio, coefficient of thermal expansion and material coordinate system of a preset single cell, and to determine the material properties of the cable tie through a preset orthogonal anisotropic material, and to determine the elastic modulus, Poisson's ratio and material orientation of the cable tie.
7. The solid-state battery module pre-tightening assembly simulation device according to claim 5, characterized in that, The simulation control module includes: The setting unit is used to set an initial step and multiple load steps, so as to assign the basic temperature values of all cell nodes in the pre-tight assembly condition mesh model in the preset initial step, and to perform module compression, module springback, cable tie fastening, correct cell expansion and cell expansion through the multiple load steps. Based on the initial step and the multiple load steps, the working condition boundary and load data of the pre-tight assembly condition corresponding to the target solid-state battery module are determined. The activation unit is used to adjust the initial increment step and the minimum increment step in the initial step, and to activate the target deformation switch corresponding to all load steps. At the same time, contact control is activated to perform simulation convergence control operations and obtain the corresponding simulation convergence parameters.
8. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the simulation method for pre-tightening assembly of a solid-state battery module as described in any one of claims 1-4.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the simulation method for pre-tightening assembly of solid-state battery modules as described in any one of claims 1-4.
10. A computer program product, comprising a computer program, characterized in that, The computer program is executed to implement the simulation method for pre-tightening assembly of solid-state battery modules as described in any one of claims 1-4.