Method and device for determining modal frequency of a battery pack tooling structure

Abstract

The present application provides a method and device for determining the modal frequency of a battery pack tooling structure. The method includes: dividing an analysis model of the battery pack tooling to be measured into multiple sub-analysis models, where the sub-analysis models include a base and a tooling bracket; determining the model material and model stiffness attributes corresponding to each sub-analysis model; determining an equivalent stiffness vector formed by each installation point between the tooling bracket and the base in multiple preset directions according to the model material and model stiffness attributes corresponding to each sub-analysis model; and determining the modal frequency corresponding to the analysis model of the battery pack tooling to be measured by using the equivalent stiffness vector corresponding to each installation point. The present application uses the installation points between the base and the tooling bracket to equivalently replace the entire base for modal frequency calculation, greatly shortening the calculation time of the modal frequency and improving the test efficiency of the battery pack tooling structure.

Description

Technical Field

[0001] This application relates to the technical field of tooling modal analysis, and particularly to a method and device for determining the modal frequency of a battery pack tooling structure. Background Art

[0002] With the increasing attention to safety performance and energy, the safety performance of the battery pack has become even more important. In particular, the vibration characteristics of the battery pack need to be matched with the whole vehicle in the design, and it is also commonly used for its durability life evaluation. Currently, there are various toolings for battery pack vibration testing, and their structures are also different. Some of the designed tooling structures are unreasonable and no vibration frequency analysis has been carried out, resulting in the sample parts being unable to avoid the vibration sweep frequency, leading to rework or even scrapping of the designed tooling, seriously affecting the overall development schedule of the project.

[0003] Most of the current toolings for battery pack vibration testing do not perform vibration analysis and optimization in the early data stage. At the same time, due to considering the influence of the tooling accuracy, it takes a long time to build a tooling data model, and it also takes a long time to calculate the overall package mode and vibration of the tooling. Sometimes, it may be necessary to perform multiple optimization iterations, which may take more time for engineers lacking experience, thus affecting the product development cycle and iteration efficiency, etc. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide at least a method and device for determining the modal frequency of a battery pack tooling structure. This application calculates the modal frequency by equivalently replacing the entire base with the installation points between the base and the tooling bracket, greatly shortening the calculation time of the modal frequency and improving the test efficiency of the battery pack tooling structure.

[0005] This application mainly includes the following aspects:

[0006] In the first aspect, an embodiment of this application provides a method for determining the modal frequency of a battery pack tooling structure, and the method includes:

[0007] Dividing the analysis model of the battery pack tooling to be tested into multiple sub-analysis models, where the sub-analysis models include a base and a tooling bracket; determining the model material and model stiffness attribute corresponding to each sub-analysis model; determining the equivalent stiffness vector formed by each installation point between the tooling bracket and the base in multiple preset directions according to the model material and model stiffness attribute corresponding to each sub-analysis model; using the equivalent stiffness vector corresponding to each installation point to determine the modal frequency corresponding to the analysis model of the battery pack tooling to be tested.

[0008] In a possible implementation, the equivalent stiffness vectors formed by each mounting point in multiple preset directions are determined as follows: for each preset direction of the mounting point, a preset unit force is applied in the preset direction to obtain the displacement generated by the mounting point in the preset direction; for each preset direction of the mounting point, based on the preset unit force and the generated displacement, the stiffness value generated by the mounting point in the preset direction is determined; the equivalent stiffness vector corresponding to the mounting point is formed by the stiffness values generated by the respective preset directions.

[0009] In a possible implementation, for the stiffness value generated by each mounting point in each preset direction, the method further includes: if the stiffness value generated in the preset direction is greater than the preset stiffness threshold, the preset stiffness threshold is determined as the stiffness value generated by the mounting point in the preset direction.

[0010] In a possible implementation, the steps of determining the modal frequency of the tooling analysis model of the battery pack to be tested by using the equivalent stiffness vector corresponding to each mounting point include: according to the equivalent stiffness vector corresponding to each mounting point, an equivalent stiffness matrix K is constructed, where each element k ij in the equivalent stiffness matrix K represents the stiffness value of the i-th mounting point in the j-th preset direction; the finite element method is used to perform structural dynamics analysis on the large tooling to construct the mass matrix M of the tooling analysis model of the battery pack to be tested, and each element m p in the mass matrix represents the mass of the p-th sub-analysis model; according to the equivalent stiffness matrix K and the mass matrix M, the modal frequency corresponding to the tooling analysis model of the battery pack to be tested is determined.

[0011] In a possible implementation, the steps of determining the modal frequency corresponding to the tooling analysis model of the battery pack to be tested according to the equivalent stiffness matrix K and the mass matrix M include: decoupling the equivalent stiffness matrix K and the mass matrix M respectively to obtain the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be tested; using the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be tested to determine the modal frequency corresponding to the tooling analysis model of the battery pack to be tested.

[0012] In a possible implementation, the steps of using the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be tested to determine the modal frequency corresponding to the tooling analysis model of the battery pack to be tested include: calculating the ratio between the modal stiffness and the modal mass; determining the square root of the ratio as the modal frequency corresponding to the tooling analysis model of the battery pack to be tested.

[0013] In a possible implementation, the method further includes: determining whether the modal frequency is within a preset frequency range; if the modal frequency is within the preset frequency range, determining that the analysis model of the battery pack tooling to be tested passes the frequency test; if the modal frequency is not within the preset frequency range, determining that the analysis model of the battery pack tooling to be tested fails the frequency test.

[0014] In a second aspect, an embodiment of the present application further provides a device for determining the modal frequency of a battery pack tooling structure. The device includes:

[0015] A division module, configured to divide the analysis model of the battery pack tooling to be tested into multiple sub-analysis models, where the sub-analysis model includes a base and a tooling bracket; an attribute determination module, configured to determine the model material and model stiffness attribute corresponding to each sub-analysis model; a stiffness determination module, configured to determine the equivalent stiffness vector formed by each installation point in multiple preset directions according to each installation point between the tooling bracket and the base and the model material and model stiffness attribute corresponding to each sub-analysis model; a frequency determination module, configured to use the equivalent stiffness vector corresponding to each installation point to determine the modal frequency corresponding to the analysis model of the battery pack tooling to be tested.

[0016] In a third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device runs, communication is performed between the processor and the memory through the bus. When the machine-readable instructions are run by the processor, the steps of the method for determining the modal frequency of the battery pack tooling structure described in the first aspect or any possible implementation manner in the first aspect are executed.

[0017] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the steps of determining the modal frequency of the battery pack tooling structure described in the first aspect or any possible implementation manner in the first aspect are executed.

[0018] A method and device for determining the modal frequency of a battery pack tooling structure provided by an embodiment of the present application. The method includes: dividing an analysis model of the battery pack tooling to be tested into multiple sub-analysis models, where the sub-analysis model includes a base and a tooling bracket; determining the model material and model stiffness attribute corresponding to each sub-analysis model; determining an equivalent stiffness vector formed by each installation point between the tooling bracket and the base in multiple preset directions according to each installation point between the tooling bracket and the base and the model material and model stiffness attribute corresponding to each sub-analysis model; and determining the modal frequency corresponding to the analysis model of the battery pack tooling to be tested by using the equivalent stiffness vector corresponding to each installation point. In the present application, the modal frequency calculation is performed by equivalently replacing the entire base with the installation points between the base and the tooling bracket, which greatly shortens the calculation time of the modal frequency and improves the test efficiency of the battery pack tooling structure.

[0019] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically gives preferred embodiments and cooperates with the attached drawings for detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Shows a flowchart of a method for determining the modal frequency of a battery pack tooling structure provided by an embodiment of the present application;

[0022] Figure 2 Shows a structural schematic diagram of a vibration tooling assembly provided by an embodiment of the present application;

[0023] Figure 3 Shows a structural schematic diagram of a device for determining the modal frequency of a battery pack tooling structure provided by an embodiment of the present application;

[0024] Figure 4 Shows a structural schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not used to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without logical context relationships may be reversed or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present application.

[0026] In addition, the described embodiments are only some embodiments of the present application, rather than all embodiments. The components of the embodiments of the present application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the protection scope of the present application.

[0027] Most of the current tooling for battery pack vibration testing does not perform vibration analysis and optimization in the early data stage. At the same time, due to considering the accuracy impact of the tooling, it takes a long time to build a data model for the tooling, and it also takes a long time to perform modal and vibration calculations for the entire tooling package. Sometimes, multiple optimization iterations may be required. At this time, it may take more time for engineers lacking experience, thus affecting the product development cycle and iteration efficiency.

[0028] Based on this, the embodiments of the present application provide a method and device for determining the modal frequency of a battery pack tooling structure. By equivalently replacing the entire base with the installation points between the base and the tooling bracket for modal frequency calculation, the optimization iteration calculation and verification cycle of the battery pack performance are greatly shortened, and the test efficiency of the battery pack tooling structure is improved, as follows:

[0029] Please refer to Figure 1 , Figure 1 which shows a flowchart of a method for determining the modal frequency of a battery pack tooling structure provided by an embodiment of the present application. As Figure 1 shown, the method for determining the modal frequency of a battery pack tooling structure provided by an embodiment of the present application includes the following steps:

[0030] S100. Divide the analysis model of the battery pack tooling to be tested into multiple sub-analysis models.

[0031] Among them, the sub-analysis model includes a vibration tooling assembly and a battery pack assembly. Please refer to Figure 2 , Figure 2 which shows a structural schematic diagram of a vibration tooling assembly provided by an embodiment of the present application. As Figure 2 shown, the vibration tooling assembly includes a base 1 and a tooling bracket 2. Among them, the base 1 and the tooling bracket 2 are fixedly connected together through mounting points, and the mounting points can be fixing connectors such as bolts.

[0032] In a specific embodiment, after obtaining the analysis model of the battery pack tooling to be measured, according to the installation contact points between the battery pack assembly and the tooling bracket, the equivalent model method of the detailed model is used to perform equivalent processing on the battery pack assembly, so as to form the boundary constraint conditions for solving the modal frequency of the analysis model of the battery pack tooling to be measured subsequently.

[0033] S200. Determine the model material and model stiffness attributes corresponding to each sub-analysis model.

[0034] In a specific embodiment, the model material corresponding to the tooling bracket can be made of aluminum or steel, and its corresponding model material is determined according to the actual situation of the tooling bracket and the base in the analysis model of the battery pack tooling to be measured.

[0035] The model stiffness attributes include at least one of the following items: model material stiffness, Poisson's ratio, and material density.

[0036] S300. According to each mounting point between the tooling bracket and the base and the model material and model stiffness attributes corresponding to each sub-analysis model, determine the equivalent stiffness vector formed by each mounting point in multiple preset directions.

[0037] In a preferred embodiment, the tooling bracket is fixedly connected to the base through the corresponding mounting points, and the battery pack assembly is fixedly arranged on the tooling bracket.

[0038] Specifically, in the present application, to improve the calculation efficiency of the modal frequency, the overall base is not considered, and only the stiffness of the mounting points between the base and the tooling bracket needs to be considered. Through the stiffness of the corresponding mounting points between the tooling bracket and the base, the modal frequency corresponding to the analysis model of the battery pack tooling to be measured is calculated by using the method of stiffness equivalence, which can greatly improve the calculation efficiency.

[0039] In a specific embodiment, the equivalent stiffness vector formed by each mounting point in multiple preset directions is determined by the following method:

[0040] For each preset direction of the installation point, apply a preset unit force in the preset direction to obtain the displacement generated by the installation point in the preset direction. For each preset direction of the installation point, determine the stiffness value generated by the installation point in the preset direction according to the preset unit force and the generated displacement. The stiffness values generated by each preset direction form the equivalent stiffness vector corresponding to the installation point.

[0041] In one example, when applying unit forces in six directions corresponding to a certain installation point, the stiffnesses corresponding to the installation point in the six directions can be obtained. For example, the stiffness of the installation point in the X direction is about 1.4e7 N / mm, and the unit force is usually 1 N, which can be set according to actual needs. Specifically, by applying an external force in a certain direction of the installation point, the deformation amount of the installation point in this direction, that is, the generated elastic displacement, can be obtained. Further, according to the stiffness calculation formula, the stiffness value of the installation point in a certain direction can be determined.

[0042] In a specific embodiment, the equivalent stiffness vector corresponding to a certain installation point is (X: 1.4e7 N / mm, Y: 1.4e7 N / mm, Z: 3e7 N / mm), indicating that the stiffness values of the installation point in the three directions of X, Y, and Z are 1.4e7 N / mm, 1.4e7 N / mm, and 3e7 N / mm respectively.

[0043] In another specific embodiment, for the stiffness value generated by each installation point in each preset direction, the method further includes:

[0044] If the stiffness value generated by the preset direction is greater than the preset stiffness threshold, then determine the preset stiffness threshold as the stiffness value generated by the installation point in the preset direction.

[0045] In a specific embodiment, for example, the equivalent stiffness vector obtained by calculating a certain installation point along six preset directions is (1.4e7 N / mm, 1.4e7 N / mm, 3e7 N / mm, 1e9 N / mm, 1e8 N / mm, 1e8 N / mm), where the preset stiffness threshold is 1e8 N / mm. Then, 1e9 N / mm is greater than 1e8 N / mm. Therefore, 1e9 N / mm is replaced with 1e8 N / mm, and the finally obtained equivalent stiffness vector is (1.4e7 N / mm, 1.4e7 N / mm, 3e7 N / mm, 1e8 N / mm, 1e8 N / mm, 1e8 N / mm).

[0046] Return Figure 1 , S400. Use the equivalent stiffness vector corresponding to each installation point to determine the modal frequency corresponding to the analysis model of the battery pack tooling to be tested.

[0047] In a preferred embodiment, the steps of determining the modal frequency corresponding to the tooling analysis model of the battery pack to be measured by using the equivalent stiffness vectors corresponding to each installation point include:

[0048] Construct an equivalent stiffness matrix K according to the equivalent stiffness vectors corresponding to each installation point, where each element k in the equivalent stiffness matrix K ij represents the stiffness value of the i-th installation point in the j-th preset direction. Perform structural dynamics analysis on the large-scale tooling by using the finite element method, and construct the mass matrix M of the tooling analysis model of the battery pack to be measured. Each element m in the mass matrix M p represents the mass of the p-th sub-analysis model. Determine the modal frequency corresponding to the tooling analysis model of the battery pack to be measured according to the equivalent stiffness matrix K and the mass matrix M.

[0049] In a specific embodiment, for example, the equivalent stiffness matrix is composed of the equivalent stiffness vectors (1.4e7 N / mm, 1.4e7 N / mm, 3e7 N / mm) and the equivalent stiffness vector (1.8e7 N / mm, 1.4e7 N / mm, 1.8e7 N / mm). Among them, each row represents the equivalent stiffness vector formed by an installation point in the three directions of X, Y, and Z. Among them, k 21 represents that the stiffness value of the second installation point in the X direction is 1.8e7.

[0050] In the present application, p = 3, and each element m in the mass matrix M p includes the mass of the tooling bracket, the mass of the base, and the mass of the battery pack assembly.

[0051] In a preferred embodiment, the steps of determining the modal frequency corresponding to the tooling analysis model of the battery pack to be measured according to the equivalent stiffness matrix K and the mass matrix M include:

[0052] Decouple the equivalent stiffness matrix K and the mass matrix M respectively to obtain the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be measured. Use the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be measured to determine the modal frequency corresponding to the tooling analysis model of the battery pack to be measured.

[0053] In another specific embodiment, the steps of determining the modal frequency corresponding to the tooling analysis model of the battery pack to be measured by using the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be measured include:

[0054] Calculate the ratio between the modal stiffness and the modal mass, and determine the square root of the ratio as the modal frequency corresponding to the tooling analysis model of the battery pack to be measured.

[0055] In a specific embodiment, the modal frequency corresponding to the tooling analysis model of the battery pack to be measured is determined by the following formula:

[0056] W r 2 = K r / M r

[0057] In this formula, W r represents the modal frequency corresponding to the tooling analysis model of the battery pack to be measured, K r represents the modal stiffness, and M r represents the modal mass.

[0058] Specifically, this application uses the eigenvalue mass normalization method and combines the boundary conditions given by the battery pack assembly to calculate and obtain the modal frequency and modal vibration mode corresponding to the tooling analysis model of the battery pack to be measured.

[0059] In another preferred embodiment, the method of this application further includes:

[0060] Judge whether the modal frequency is within a preset frequency range. If the modal frequency is within the preset frequency range, it is determined that the tooling analysis model of the battery pack to be measured passes the frequency test. If the modal frequency is not within the preset frequency range, it is determined that the tooling analysis model of the battery pack to be measured fails the frequency test.

[0061] In the embodiment of this application, the purpose of determining the modal frequency of the battery pack tooling structure is to judge whether the tooling analysis model of the battery pack to be measured meets the actual design requirements. If it does not meet the design requirements, it will cause the tooling analysis model of the battery pack to be measured to fail in actual application, and further cause the relevant experiments of the battery pack to be unable to be carried out. Therefore, through the calculated modal frequency and combined with the preset frequency range, the stability of the battery pack tooling structure can be judged. For example, when the modal frequency corresponding to the tooling analysis model of the battery pack to be measured is greater than 230HZ, it is considered that the tooling analysis model of the battery pack to be measured is relatively stable and can be used for subsequent experiments.

[0062] The traditional calculation process of the modal frequency with a base takes about more than 3 hours to calculate the corresponding modal frequency. Compared with the traditional calculation of the modal frequency with a base, this application shortens the modal frequency calculation time to within 5 minutes by means of equivalent bases at the installation points, greatly reducing the calculation time and improving the calculation efficiency.

[0063] Based on the same inventive concept, in the embodiment of this application, there is also provided a device for determining the modal frequency of the battery pack tooling structure corresponding to the method for determining the modal frequency of the battery pack tooling structure provided in the above embodiment. Since the principle of solving problems by the device in the embodiment of this application is similar to the method for determining the modal frequency of the battery pack tooling structure in the above embodiment of this application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0064] Please refer to Figure 3 ,Figure 3 The structural schematic diagram of a device for determining the modal frequency of a battery pack tooling structure provided by an embodiment of the present application is shown. As Figure 3 shown, the device includes:

[0065] A dividing module 210, configured to divide an analysis model of a battery pack tooling to be measured into a plurality of sub-analysis models, where the sub-analysis model includes a base and a tooling bracket.

[0066] An attribute determining module 220, configured to determine the model material and model stiffness attribute corresponding to each sub-analysis model.

[0067] A stiffness determining module 230, configured to determine an equivalent stiffness vector formed by each installation point in a plurality of preset directions according to each installation point between the tooling bracket and the base and the model material and model stiffness attribute corresponding to each sub-analysis model.

[0068] A frequency determining module 240, configured to determine the modal frequency corresponding to the analysis model of the battery pack tooling to be measured by using the equivalent stiffness vector corresponding to each installation point.

[0069] Based on the same inventive concept, please refer to Figure 3 , Figure 3 The structural schematic diagram of an electronic device provided by an embodiment of the present application is shown. The electronic device 300 includes: a processor 310, a memory 320, and a bus 330. The memory 320 stores machine-readable instructions executable by the processor 310. When the electronic device 300 runs, communication is performed between the processor 310 and the memory 320 through the bus 330. When the machine-readable instructions are run by the processor 310, the steps of the method for determining the modal frequency of the battery pack tooling structure as described in any one of the above embodiments are executed.

[0070] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the steps of the method for determining the modal frequency of the battery pack tooling structure provided in the above embodiment are executed.

[0071] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems and devices described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein. In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical functional division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings, direct couplings, or communication connections shown or discussed among each other can be through some communication interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0072] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0073] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0074] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or a part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0075] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application and should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for determining the modal frequency of a battery pack tooling structure, characterized in that, The method includes: Dividing the tooling analysis model of the battery pack to be tested into multiple sub-analysis models, where the sub-analysis models include a base and a tooling bracket; Determining the model material and model stiffness attribute corresponding to each sub-analysis model; According to each installation point between the tooling bracket and the base and the model material and model stiffness attribute corresponding to each sub-analysis model, determining the equivalent stiffness vector formed by each installation point in multiple preset directions; Using the equivalent stiffness vector corresponding to each installation point to determine the modal frequency corresponding to the tooling analysis model of the battery pack to be tested; Among them, the step of using the equivalent stiffness vector corresponding to each installation point to determine the modal frequency corresponding to the tooling analysis model of the battery pack to be tested includes: Construct an equivalent stiffness matrix K based on the equivalent stiffness vectors corresponding to each installation point, where each element in the equivalent stiffness matrix K represents the stiffness value of the i-th installation point in the j-th preset direction; The finite element method is used to perform structural dynamics analysis on a large-scale tooling, and a mass matrix M of an analysis model of the tooling for the battery pack to be measured is constructed. Each element in the mass matrix includes the base mass, the tooling bracket mass, and the battery pack assembly mass corresponding to the p-th sub-analysis model; Decoupling the equivalent stiffness matrix K and the mass matrix M respectively to obtain the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be tested; Calculating the ratio between the modal stiffness and the modal mass; Determining the square root of the ratio as the modal frequency corresponding to the tooling analysis model of the battery pack to be tested.

2. The method according to claim 1, wherein The equivalent stiffness vector formed by each installation point in multiple preset directions is determined by the following method: For each preset direction of this installation point, applying a preset unit force in this preset direction to obtain the displacement generated by this installation point in this preset direction; For each preset direction of this installation point, according to the preset unit force and the generated displacement, determining the stiffness value generated by this installation point in this preset direction; The equivalent stiffness vector corresponding to this installation point is formed by the stiffness values generated by each preset direction.

3. The method according to claim 2, wherein For the stiffness value generated by each installation point in each preset direction, the method further includes: If the stiffness value generated by this preset direction is greater than the preset stiffness threshold, then determining the preset stiffness threshold as the stiffness value generated by this installation point in this preset direction.

4. The method according to claim 1, wherein The method further includes: Judging whether the modal frequency is within a preset frequency range; If the modal frequency is within the preset frequency range, determining that the tooling analysis model of the battery pack to be tested passes the frequency test; If the modal frequency is not within the preset frequency range, determining that the tooling analysis model of the battery pack to be tested fails the frequency test.

5. A device for determining the modal frequency of a battery pack tooling structure, characterized in that, The device includes: A division module for dividing the tooling analysis model of the battery pack to be tested into multiple sub-analysis models, where the sub-analysis models include a base and a tooling bracket; An attribute determination module for determining the model material and model stiffness attribute corresponding to each sub-analysis model; A stiffness determination module for determining the equivalent stiffness vector formed by each installation point in multiple preset directions according to each installation point between the tooling bracket and the base and the model material and model stiffness attribute corresponding to each sub-analysis model; A frequency determination module for using the equivalent stiffness vector corresponding to each installation point to determine the modal frequency corresponding to the tooling analysis model of the battery pack to be tested; The frequency determination module is further used for: Construct an equivalent stiffness matrix \(K\) based on the equivalent stiffness vectors corresponding to each installation point, where each element in the equivalent stiffness matrix \(K\) represents the stiffness value of the \(i\)-th installation point in the \(j\)-th preset direction; The finite element method is used to perform structural dynamics analysis on a large-scale tooling, and the mass matrix M of the analysis model of the tooling for the battery pack to be measured is constructed. Each element in the mass matrix represents the mass of the p-th sub-analysis model; Decoupling the equivalent stiffness matrix K and the mass matrix M respectively to obtain the modal stiffness and modal mass corresponding to the tooling analysis model of the battery pack to be tested; Calculating the ratio between the modal stiffness and the modal mass; Determining the square root of the ratio as the modal frequency corresponding to the tooling analysis model of the battery pack to be tested.

6. An electronic device, characterized in that, Including: A processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the memory through the bus, and when the machine-readable instructions are run by the processor, the steps of the method for determining the modal frequency of the battery pack tooling structure according to any one of claims 1 to 4 are executed.

7. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is run by a processor, the steps of the method for determining the modal frequency of the battery pack tooling structure according to any one of claims 1 to 4 are executed.

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