Modeling method, device and equipment for cylindrical battery cell in simulation and storage medium

Abstract

The invention discloses a modeling method, device and equipment for a cylindrical battery cell in simulation and a storage medium, and relates to the technical field of battery cell structure simulation. The method comprises the following steps: constructing spiral lines corresponding to different components in a target cylindrical cell based on a polar coordinate equation; the spiral lines corresponding to the different components are stretched according to the size parameters of the target cylindrical battery cell, and an initial three-dimensional model is obtained; scaling the initial three-dimensional model to obtain a plurality of simplified three-dimensional models; and performing simulation according to the initial three-dimensional model and each simplified three-dimensional model so as to determine a target three-dimensional model from each simplified three-dimensional model. Therefore, the internal structure and characteristics of the single cylindrical battery can be reflected more accurately by a refined modeling mode of different battery cell components, so that a simulation result is closer to the performance of an actual battery; meanwhile, through hierarchical scaling, the mechanical response of each component of the battery cell can be accurately expressed, the model calculation efficiency is greatly improved, and calculation resources are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell structure simulation, and in particular to a modeling method, device, equipment and storage medium for a cylindrical battery cell in simulation. Background Art

[0002] The traditional homogenization model simplifies the battery core into a single material, ignoring the complex interactions between internal components such as the positive and negative electrodes, separators, etc., resulting in the inability to accurately simulate internal defects under mechanical loads, which in turn leads to battery failure and safety hazards due to structural problems in actual use. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a modeling method, device, equipment and storage medium for cylindrical battery cells in simulation, so as to more accurately reflect the internal structure and characteristics of single cylindrical batteries.

[0004] The present invention provides the following technical solutions: In a first aspect, the present invention provides a modeling method for a cylindrical battery cell in simulation, comprising: Constructing spiral lines corresponding to different components in the target cylindrical battery cell based on polar coordinate equations; stretching the spiral lines corresponding to the different components according to the size parameters of the target cylindrical battery cell to obtain an initial three-dimensional model; Scaling the initial three-dimensional model to obtain multiple simplified three-dimensional models; Simulation is performed based on the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models.

[0005] In one embodiment, scaling the initial three-dimensional model to obtain a plurality of simplified three-dimensional models includes: The initial three-dimensional model is scaled based on a plurality of preset winding layer numbers to obtain simplified three-dimensional models corresponding to the preset winding layer numbers.

[0006] In one embodiment, the initial three-dimensional model is scaled based on a plurality of preset winding layer numbers to obtain simplified three-dimensional models corresponding to the preset winding layer numbers, including: For each of the preset numbers of winding layers, reducing the winding layers of the initial three-dimensional model according to the preset number of winding layers to obtain a reduced three-dimensional model; The material thickness of each winding layer in the reduced three-dimensional model is magnified according to a preset magnification factor to obtain the simplified three-dimensional model.

[0007] In one embodiment, amplifying the material thickness of each winding layer in the reduced three-dimensional model according to a preset amplification factor to obtain the simplified three-dimensional model includes: The material thickness corresponding to the different components of each winding layer in the reduced three-dimensional model is magnified according to the preset magnification factor to obtain the simplified three-dimensional model.

[0008] In one embodiment, simulating the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models includes: Simulating the initial three-dimensional model and each of the simplified three-dimensional models respectively to obtain a simulation result of the initial three-dimensional model and a simulation result of each of the simplified three-dimensional models; The target three-dimensional model is determined from the simplified three-dimensional models according to the simulation results.

[0009] In one embodiment, simulating the initial three-dimensional model and each of the simplified three-dimensional models to obtain a simulation result of the initial three-dimensional model and a simulation result of each of the simplified three-dimensional models includes: Importing the initial three-dimensional model and each of the simplified three-dimensional models into finite element software respectively to obtain an initial finite element network model corresponding to the initial three-dimensional model and a simplified finite element network model corresponding to each of the simplified three-dimensional models; Simulating the initial finite element network model and each of the simplified finite element network models respectively to obtain simulation results of the initial finite element network model and simulation results of each of the simplified finite element network models; The simulation result of the initial finite element network model is used as the simulation result of the initial three-dimensional model, and the simulation result of each simplified finite element network model is used as the simulation result of each simplified three-dimensional model.

[0010] In one embodiment, the components include: a positive electrode, a negative electrode, and a separator.

[0011] In a second aspect, the present invention provides a modeling device for a cylindrical battery cell in simulation, comprising: A construction module is used to construct spiral lines corresponding to different components in the target cylindrical battery cell based on polar coordinate equations; the spiral lines corresponding to the different components are stretched according to the size parameters of the target cylindrical battery cell to obtain an initial three-dimensional model; A scaling module, configured to scale the initial three-dimensional model to obtain a plurality of simplified three-dimensional models; The determination module is configured to simulate the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models.

[0012] In a third aspect, the present invention proposes a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the modeling method of the cylindrical battery cell in simulation as described in the first aspect is implemented.

[0013] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the modeling method of the cylindrical battery cell in simulation as described in the first aspect.

[0014] The modeling method, device, equipment, and storage medium for cylindrical battery cells in simulation disclosed in the present invention construct spiral lines corresponding to different components in a target cylindrical battery cell based on polar coordinate equations; the spiral lines corresponding to the different components are stretched according to the dimensional parameters of the target cylindrical battery cell to obtain an initial three-dimensional model; the initial three-dimensional model is scaled to obtain multiple simplified three-dimensional models; and simulation is performed based on the initial three-dimensional model and each of the simplified three-dimensional models to determine the target three-dimensional model from each of the simplified three-dimensional models. In this way, the refined modeling method for different battery cell components can more accurately reflect the internal structure and characteristics of single cylindrical batteries, making the simulation results closer to the performance of actual batteries, thereby facilitating in-depth research on the working mechanism and failure mode of single cylindrical batteries. After the corresponding battery cell undergoes safety testing, the refined model can be used to conduct benchmark analysis with the test results; at the same time, in some working conditions where local deformation of the model is not a concern, hierarchical scaling can not only accurately express the mechanical response of each component of the battery cell, but also greatly improve the model calculation efficiency and save computing resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope of protection of the present invention. In each of the drawings, similar components are numbered similarly.

[0016] Figure 1 A schematic diagram of a flow chart of a modeling method for a cylindrical battery cell in simulation proposed in this embodiment is shown; Figure 2 Schematic diagram of the Archimedean spiral proposed in this embodiment is shown; Figure 3 shows a schematic diagram of a three-dimensional closed space proposed in this embodiment; Figure 4 Another schematic diagram of the flow chart of the modeling method of the cylindrical battery cell in simulation proposed in this embodiment is shown; Figure 5 shows a schematic diagram of the reduced three-dimensional model proposed in this embodiment; Figure 6 shows a simplified three-dimensional model schematic diagram proposed in this embodiment; Figure 7 Another schematic diagram of the flow chart of the modeling method of the cylindrical battery cell in simulation proposed in this embodiment is shown; Figure 8 shows a schematic diagram of expansion loading proposed in this embodiment; Figure 9 A schematic diagram of a cell expansion and deformation cloud diagram proposed in this embodiment is shown; Figure 10 shows a statistical diagram of the critical buckling stress proposed in this embodiment; Figure 11 A schematic diagram of simulation and measurement results proposed in this embodiment is shown; Figure 12 A schematic diagram showing energy absorption statistics of components with different steel shell thicknesses proposed in this embodiment is shown; Figure 13 A structural schematic diagram of a modeling device for a cylindrical battery cell in simulation proposed in this embodiment is shown.

[0017] Description of the accompanying drawings: 1300 - Modeling device of cylindrical battery cell in simulation; 1301 - Construction module; 1302 - Scaling module; 1303 - Determination module. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the figures is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort are intended to be within the scope of protection of the present invention.

[0020] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0021] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0022] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the various embodiments of the present invention pertain. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as in the context of the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present invention.

[0023] Example 1 The embodiments of the present disclosure provide a modeling method for a cylindrical battery cell in simulation, which is used to more accurately reflect the internal structure and characteristics of a single cylindrical battery.

[0024] See Figure 1 The modeling method of the cylindrical battery cell in simulation includes steps S101 to S103, and each step is described in detail below.

[0025] Step S101 : constructing spiral lines corresponding to different components in a target cylindrical battery cell based on a polar coordinate equation; and stretching the spiral lines corresponding to the different components according to the size parameters of the target cylindrical battery cell to obtain an initial three-dimensional model.

[0026] In this embodiment, polar coordinate equations are defined for the different component materials of the target cylindrical battery cell. Further, by adjusting the equation parameters, the radius, thickness, spiral pitch and other parameters of the corresponding layers of the different components are precisely controlled to generate a geometrically accurate spiral to represent the internal structure of the target cylindrical battery cell. The components include positive electrode, negative electrode and separator. The spiral is the Archimedean spiral. Figure 2 shown.

[0027] The polar coordinate equation can be , is the polar diameter, is the increase / decrease of the pole diameter, is the rotation angle.

[0028] Furthermore, there are two spiral lines corresponding to each component, and the two spiral lines are stretched to form a three-dimensional closed space, which represents a component. Figure 3 As shown in Figure 2, the three-dimensional enclosed spaces corresponding to the positive electrode, negative electrode, and separator form the initial three-dimensional model, which can be used to reflect the mechanical response of each component within the core. The stretching parameters are determined based on the dimensional parameters of the target cylindrical cell. For example, the stretching height is the height of the target cylindrical cell.

[0029] Step S102: scaling the initial three-dimensional model to obtain a plurality of simplified three-dimensional models.

[0030] It should be noted that the actual 21,700-degree cylindrical model created using the Archimedean spiral has 27 refined winding microscopic layers. Because mechanical simulations involve component contact deformation, which consumes a significant amount of computational resources, the 27-layer refined model can be simplified depending on the simulation scenario.

[0031] In this embodiment, the initial three-dimensional model is scaled to obtain multiple simplified three-dimensional models. The thickness of a single layer of the simplified three-dimensional model is increased, the total number of layers is reduced, and the outer diameter of the battery cell remains unchanged.

[0032] In a specific embodiment, step S102 includes: scaling the initial three-dimensional model based on a plurality of preset winding layer numbers to obtain simplified three-dimensional models corresponding to the preset winding layer numbers.

[0033] In this embodiment, the initial 3D model is scaled according to multiple preset numbers of winding layers to obtain simplified 3D models corresponding to each preset number of winding layers. For example, if the initial 3D model corresponding to the target cylindrical battery cell has 27 layers, the simplified 3D model can have 1 to 26 layers.

[0034] See Figure 4 In a specific embodiment, the initial three-dimensional model is scaled based on multiple preset winding layers to obtain simplified three-dimensional models corresponding to each preset winding layer, including steps S401~S402. Each step is described in detail below.

[0035] Step S401 : for each of the preset numbers of winding layers, reducing the winding layers of the initial three-dimensional model according to the preset number of winding layers to obtain a reduced three-dimensional model.

[0036] In this embodiment, for each preset number of winding layers, the winding layers of the initial three-dimensional model are reduced according to the preset number of winding layers to obtain the corresponding reduced three-dimensional model, thereby reducing the geometric complexity of the three-dimensional model. Taking the preset number of winding layers of 13 layers and 9 layers as examples, the initial three-dimensional model with 27 winding layers, the three-dimensional model with 13 layers reduced, and the three-dimensional model with 9 layers reduced are respectively as follows: Figure 5 As shown in .

[0037] Step S402 : amplifying the material thickness of each winding layer in the reduced three-dimensional model according to a preset amplification factor to obtain the simplified three-dimensional model.

[0038] In this embodiment, since the number of winding layers of the reduced three-dimensional model is reduced, the total thickness becomes thinner and the total amount of material is reduced. Therefore, the material thickness of each winding layer in the reduced three-dimensional model needs to be magnified according to a preset magnification factor, so as to reduce the total thickness and material loss in steps, so that the obtained simplified three-dimensional model is close to the initial three-dimensional model in terms of macroscopic properties, while the model geometric complexity is lower than the initial three-dimensional model. The 27-layer initial three-dimensional model, the 13-layer simplified three-dimensional model, and the 9-layer simplified three-dimensional model are shown in the following order. Figure 6 As shown in .

[0039] In a specific embodiment, step S402 includes: amplifying the material thickness corresponding to different components of each winding layer in the reduced three-dimensional model according to the preset amplification factor to obtain the simplified three-dimensional model.

[0040] In this embodiment, the material thickness corresponding to each layer of the wound positive electrode, negative electrode and separator in the reduced three-dimensional model is proportionally enlarged according to a preset magnification factor to obtain a simplified three-dimensional model, thereby improving the accuracy and reliability of the simplified three-dimensional model in simulations or analyses involving material properties, equivalent behavior of composite materials, and interface-related effects.

[0041] Step S103 : simulating the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models.

[0042] In this embodiment, each simplified three-dimensional model serves as a candidate model of different degrees of simplification corresponding to the initial three-dimensional model. It is necessary to run the same, pre-defined simulation analysis on the initial three-dimensional model and each simplified three-dimensional model, so as to select the optimal target three-dimensional model in the simulation scenario from multiple candidate models of different degrees of simplification, and then use the target three-dimensional model to analyze the local mechanical response of the battery cell while having efficient computing capabilities.

[0043] See Figure 7 In a specific embodiment, step S103 includes steps S1031 to S1032, and each step is described in detail below.

[0044] Step S1031 : simulating the initial three-dimensional model and each of the simplified three-dimensional models respectively to obtain a simulation result of the initial three-dimensional model and a simulation result of each of the simplified three-dimensional models.

[0045] In this embodiment, the initial three-dimensional model and each simplified three-dimensional model are simulated under the same simulation conditions to obtain simulation results of the initial three-dimensional model and each simplified three-dimensional model, and the performance parameters of each model are quantified based on the simulation results.

[0046] Step S1032 : determining the target three-dimensional model from the simplified three-dimensional models according to the simulation results.

[0047] In this embodiment, the performance index errors between each simplified three-dimensional model and the initial three-dimensional model, as well as parameters such as the computational efficiency of each simplified three-dimensional model are calculated based on the simulation results. The optimal model among the simplified three-dimensional models is further evaluated based on the performance index errors, computational efficiency and other parameters, and is used as the target three-dimensional model under the simulation conditions. At the same time, the number of winding layers corresponding to the target three-dimensional model can also be determined as the minimum number of scaling layers of the initial three-dimensional model under the simulation conditions.

[0048] The best is that for the initial 3D model with 27 layers, 9 layers is the lowest zoom level.

[0049] In a specific embodiment, step S1031 includes: importing the initial three-dimensional model and each simplified three-dimensional model into finite element software respectively to obtain an initial finite element network model corresponding to the initial three-dimensional model, and a simplified finite element network model corresponding to each simplified three-dimensional model; simulating the initial finite element network model and each simplified finite element network model respectively to obtain a simulation result of the initial finite element network model, and a simulation result of each simplified finite element network model; using the simulation result of the initial finite element network model as the simulation result of the initial three-dimensional model, and using the simulation result of each simplified finite element network model as the simulation result of each simplified three-dimensional model.

[0050] In this embodiment, the initial 3D model and each simplified 3D model are imported into finite element software to obtain an initial finite element network model corresponding to the initial 3D model and a simplified finite element network model corresponding to each simplified 3D model. The finite element network model is a discretized model obtained by meshing the 3D model.

[0051] Furthermore, the same predefined boundary conditions are applied to the initial finite element network model and each simplified finite element network model for simulation, and the simulation results of the initial finite element network model and the simulation results of each simplified finite element network model are obtained from the simulation results. The simulation results of the initial finite element network model are used as the simulation results of the initial three-dimensional model, and the simulation results of each simplified finite element network model are used as the simulation results of each simplified three-dimensional model.

[0052] For example, the initial 3D model constructed in this embodiment is used to simulate the collapse of the central hole of a cylindrical battery cell. By directly applying an expansion load inside the battery cell, the collapse of the central hole of the cylindrical battery cell is caused. Based on the degree of collapse of the battery cell, the influence of each factor is reversely deduced. Figure 8In the center hole of the cylindrical battery cell, three levels of internal stress (a, b, c) are applied from the inside to the outside, increasing layer by layer to ensure that the deformation of the battery cell can be transferred to the center hole of the battery cell. After the initial three-dimensional model is loaded with internal stress, contact is generated between the layers and the shell restrains the outward expansion of the core, eventually resulting in the collapse of the center hole. Figure 9 As shown, the simulation scene corresponding to number "1" is internal stress a / b / c, and the maximum displacement of the center hole is 0.134mm; the simulation scene corresponding to number "2" is internal stress 2 (a / b / c), and the maximum displacement of the center hole is 0.341mm; the simulation scene corresponding to number "3" is internal stress 3 (a / b / c), and the maximum displacement of the center hole is 1.502mm.

[0053] At the same time, the initial three-dimensional model is used to simulate the buckling stress of the battery cell. The simulation boundary condition is to use offline linear buckling analysis to give an initial defect and truncate the refined model. The model is loaded with expansion load to explore the critical buckling stress of the core during the expansion of the battery cell. Linear buckling analysis is performed on the currently used truncated refined model to calculate the critical buckling stress of the battery cell. Figure 10 As shown in the figure, the critical buckling stress analysis results for models corresponding to different winding needle diameters are different. This model method can be used to compare the buckling characteristics and buckling laws of battery cells under different design conditions, which is helpful for battery cell design and development.

[0054] In addition, a 9-layer simplified model was used to simulate the impact of a heavy object. The simulation boundary conditions were that the weight of the falling hammer was 9.1 kg, the distance from the steel rod was 0.61 m, and the initial conversion velocity was about 3.46 m / s. The 9-layer simplified model had a centrosymmetric boundary condition. The active layer and the foil were bound together, and there was no relative displacement at the contact interface. The other internal components were in free contact. Figure 11 As shown in the figure, the error between the simulation and the measured results under this simulation condition is small. It can be seen that the coating fails in compression before the negative electrode foil at 2.4ms, the copper foil is tensile at the bend, and the active layer has weak tensile properties and fails first, followed by the copper foil breaking under tension. This allows us to analyze the failure order of the battery cell components and the energy absorption of the components, and take effective measures to improve them. Figure 12 As shown in Figure 3, the model also restrains the energy absorption parameters of components with different steel shell thicknesses.

[0055] The modeling method for cylindrical cells in simulation proposed in this embodiment constructs spiral lines corresponding to different components in the target cylindrical cell based on polar coordinate equations; the spiral lines corresponding to the different components are stretched according to the dimensional parameters of the target cylindrical cell to obtain an initial three-dimensional model; the initial three-dimensional model is scaled to obtain multiple simplified three-dimensional models; and simulation is performed based on the initial three-dimensional model and each of the simplified three-dimensional models to determine the target three-dimensional model from each of the simplified three-dimensional models. In this way, the refined modeling method for different cell components can more accurately reflect the internal structure and characteristics of single cylindrical batteries, making the simulation results closer to the performance of actual batteries, thereby facilitating in-depth research on the working mechanism and failure mode of single cylindrical batteries. After the corresponding cell undergoes safety testing, the refined model can be used to conduct benchmark analysis with the test results; at the same time, in some working conditions where local deformation of the model is not a concern, hierarchical scaling can not only accurately express the mechanical response of each cell component, but also greatly improve the model calculation efficiency and save computing resources.

[0056] Example 2 In addition, the present disclosure provides a modeling device 1300 for a cylindrical battery cell in simulation, see Figure 13 ,include: A construction module 1301 is configured to construct spiral lines corresponding to different components in a target cylindrical battery cell based on a polar coordinate equation; and to stretch the spiral lines corresponding to the different components according to the size parameters of the target cylindrical battery cell to obtain an initial three-dimensional model. A scaling module 1302 is configured to scale the initial three-dimensional model to obtain multiple simplified three-dimensional models; The determination module 1303 is configured to simulate the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models.

[0057] Optionally, the scaling module 1302 is further configured to scale the initial three-dimensional model based on a plurality of preset winding layer numbers to obtain simplified three-dimensional models corresponding to the preset winding layer numbers.

[0058] Optionally, the scaling module 1302 is also used to reduce the winding layers of the initial three-dimensional model according to the preset number of winding layers for each of the preset winding layers to obtain a reduced three-dimensional model; and to amplify the material thickness of each winding layer in the reduced three-dimensional model according to a preset magnification factor to obtain the simplified three-dimensional model.

[0059] Optionally, the scaling module 1302 is further configured to amplify the material thickness corresponding to different components of each winding layer in the reduced three-dimensional model according to the preset amplification factor to obtain the simplified three-dimensional model.

[0060] Optionally, the determination module 1303 is also used to simulate the initial three-dimensional model and each simplified three-dimensional model respectively to obtain the simulation results of the initial three-dimensional model and the simulation results of each simplified three-dimensional model; and determine the target three-dimensional model from each simplified three-dimensional model based on each simulation result.

[0061] Optionally, the determination module 1303 is further used to import the initial three-dimensional model and each simplified three-dimensional model into the finite element software respectively to obtain the initial finite element network model corresponding to the initial three-dimensional model, and the simplified finite element network model corresponding to each simplified three-dimensional model; simulate the initial finite element network model and each simplified finite element network model respectively to obtain the simulation results of the initial finite element network model and the simulation results of each simplified finite element network model; use the simulation results of the initial finite element network model as the simulation results of the initial three-dimensional model, and use the simulation results of each simplified finite element network model as the simulation results of each simplified three-dimensional model.

[0062] Optionally, the components include: a positive electrode, a negative electrode and a separator.

[0063] The device provided in the embodiment of the present disclosure can execute the steps of the modeling method of the cylindrical battery cell in simulation provided in Example 1, which will not be described again to avoid repetition.

[0064] The modeling device for cylindrical battery cells in simulation proposed in this embodiment constructs spiral lines corresponding to different components in the target cylindrical battery cell based on polar coordinate equations; the spiral lines corresponding to the different components are stretched according to the dimensional parameters of the target cylindrical battery cell to obtain an initial three-dimensional model; the initial three-dimensional model is scaled to obtain multiple simplified three-dimensional models; and simulation is performed based on the initial three-dimensional model and each of the simplified three-dimensional models to determine the target three-dimensional model from each of the simplified three-dimensional models. In this way, the refined modeling method for different battery cell components can more accurately reflect the internal structure and characteristics of single cylindrical batteries, making the simulation results closer to the performance of actual batteries, thereby facilitating in-depth research on the working mechanism and failure mode of single cylindrical batteries. After the corresponding battery cell undergoes safety testing, the refined model can be used to conduct benchmark analysis with the test results. At the same time, in some working conditions where local deformation of the model is not a concern, hierarchical scaling can not only accurately express the mechanical response of each battery cell component, but also greatly improve the model calculation efficiency and save computing resources.

[0065] Example 3 In addition, an embodiment of the present disclosure provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the modeling method of the cylindrical battery cell in simulation described in Example 1 is implemented.

[0066] The device provided in the embodiment of the present disclosure can execute the steps of the modeling method of the cylindrical battery cell in simulation provided in Example 1, which will not be described again to avoid repetition.

[0067] Example 4 An embodiment of the present disclosure provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the modeling method of the cylindrical battery cell in simulation described in Embodiment 1 is implemented.

[0068] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0069] The computer-readable storage medium provided in this embodiment can implement the modeling method of the cylindrical battery cell provided in Example 1 in simulation. To avoid repetition, it will not be described here.

[0070] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0071] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0072] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A modeling method for cylindrical battery cells in simulation, characterized in that: include: Constructing spiral lines corresponding to different components in the target cylindrical battery cell based on polar coordinate equations; stretching the spiral lines corresponding to the different components according to the size parameters of the target cylindrical battery cell to obtain an initial three-dimensional model; Scaling the initial three-dimensional model to obtain multiple simplified three-dimensional models; Simulation is performed based on the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models.

2. The modeling method of a cylindrical battery cell in simulation according to claim 1, characterized in that: Scaling the initial three-dimensional model to obtain multiple simplified three-dimensional models includes: The initial three-dimensional model is scaled based on a plurality of preset winding layer numbers to obtain simplified three-dimensional models corresponding to the preset winding layer numbers.

3. The modeling method of a cylindrical battery cell in simulation according to claim 2, characterized in that: The initial three-dimensional model is scaled based on a plurality of preset winding layers to obtain simplified three-dimensional models corresponding to the preset winding layers, including: For each of the preset numbers of winding layers, reducing the winding layers of the initial three-dimensional model according to the preset number of winding layers to obtain a reduced three-dimensional model; The material thickness of each winding layer in the reduced three-dimensional model is magnified according to a preset magnification factor to obtain the simplified three-dimensional model.

4. The modeling method of a cylindrical battery cell in simulation according to claim 3, characterized in that: The step of amplifying the material thickness of each winding layer in the reduced three-dimensional model according to a preset amplification factor to obtain the simplified three-dimensional model includes: The material thickness corresponding to the different components of each winding layer in the reduced three-dimensional model is magnified according to the preset magnification factor to obtain the simplified three-dimensional model.

5. The modeling method of a cylindrical battery cell in simulation according to claim 1, characterized in that: The simulating the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models includes: Simulating the initial three-dimensional model and each of the simplified three-dimensional models respectively to obtain a simulation result of the initial three-dimensional model and a simulation result of each of the simplified three-dimensional models; The target three-dimensional model is determined from the simplified three-dimensional models according to the simulation results.

6. The modeling method of a cylindrical battery cell in simulation according to claim 5, characterized in that: The simulating the initial three-dimensional model and each of the simplified three-dimensional models to obtain the simulation results of the initial three-dimensional model and the simulation results of each of the simplified three-dimensional models includes: Importing the initial three-dimensional model and each of the simplified three-dimensional models into finite element software respectively to obtain an initial finite element network model corresponding to the initial three-dimensional model and a simplified finite element network model corresponding to each of the simplified three-dimensional models; Simulating the initial finite element network model and each of the simplified finite element network models respectively to obtain simulation results of the initial finite element network model and simulation results of each of the simplified finite element network models; The simulation result of the initial finite element network model is used as the simulation result of the initial three-dimensional model, and the simulation result of each simplified finite element network model is used as the simulation result of each simplified three-dimensional model.

7. The modeling method of a cylindrical battery cell in simulation according to claim 1, characterized in that: The components include: a positive electrode, a negative electrode and a separator.

8. A modeling device for cylindrical battery cells in simulation, characterized in that: include: A construction module is used to construct spiral lines corresponding to different components in the target cylindrical battery cell based on polar coordinate equations; the spiral lines corresponding to the different components are stretched according to the size parameters of the target cylindrical battery cell to obtain an initial three-dimensional model; A scaling module, configured to scale the initial three-dimensional model to obtain a plurality of simplified three-dimensional models; The determination module is configured to simulate the initial three-dimensional model and each of the simplified three-dimensional models to determine a target three-dimensional model from each of the simplified three-dimensional models.

9. A computer device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the modeling method of the cylindrical battery cell in simulation according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that It stores a computer program, which, when executed by a processor, implements the modeling method of the cylindrical battery cell in simulation as claimed in any one of claims 1 to 7.

Images