Method and device for carrying out vibration simulation on battery pack model

Abstract

The invention provides a method and device for carrying out vibration simulation on a battery pack model, and the method comprises the following steps: carrying out envelope equivalent modeling on a battery to obtain an equivalent battery model, and importing the equivalent battery model and geometric models of other battery pack parts in a battery pack into HyperMesh to obtain a first simulation model; obtaining an actual gap distance between the battery and the battery bracket to obtain a gap layer, and adding the gap layer into the first simulation model to obtain a second simulation model; defining material parameters of each material type used by the battery pack to corresponding battery pack components in the second simulation model to obtain a third simulation model; and performing vibration simulation on the third simulation model by using Workbench. According to the scheme, the space between the battery and the battery support is filled with the gap layer with the extremely low modulus, the correlation and independence of the battery and the support are guaranteed, and therefore the simulation accuracy is improved.

Description

Technical Field

[0001] The present application relates to the field of battery testing, and in particular to a method and device for performing vibration simulation on a battery pack model. Background Art

[0002] In today's society, as the concept of environmental protection continues to gain popularity and science and technology continue to advance, new energy electric two-wheeled vehicles have gradually become one of the popular choices for people's short-distance travel. As the most critical power source for such vehicles, battery packs undoubtedly carry the important mission of ensuring the normal operation of the vehicles. As a result, their safety and reliability issues have received increasing attention from all walks of life.

[0003] From the perspective of mechanical reliability, the vibration strength of the battery pack is one of the most important evaluation contents. Because in the actual use of electric two-wheeled vehicles, whether it is driving on flat urban roads, passing through some slightly bumpy country roads, or encountering various shaking during transportation, the battery pack will be affected by vibration to varying degrees. If there are hidden dangers in the vibration strength of the battery pack, it is very likely to cause a series of problems such as damage to the internal structure of the battery, poor line contact, and degradation of battery module performance, which will affect the overall service life of the battery pack and the safe and stable operation of the vehicle.

[0004] At present, there are two common methods for determining the vibration strength of battery packs. The first method is to conduct vibration tests on battery packs according to relevant industry standards, and then conduct standard charge and discharge tests on them to determine whether the battery packs can meet the corresponding requirements. Specifically, when implementing the vibration test, the battery pack needs to be manufactured first before it can be placed on a professional vibration test device to simulate various vibration conditions that may be encountered in actual use according to the set parameters such as vibration frequency, amplitude and duration. However, this method has obvious limitations. On the one hand, since the vibration test can only be carried out after the battery pack is physically manufactured, this means that if a problem is found in the test, the structure of the battery pack needs to be redesigned and optimized, and then the product is manufactured again and a new round of tests is carried out. This process will be repeated and a lot of manpower, material resources and precious time costs will be consumed. Moreover, more importantly, it is often difficult to detect all potential failure points of the battery pack by relying solely on a single vibration test. After all, the vibration conditions in actual use are complex and changeable. There may be some extreme conditions or the superposition of multiple vibration factors. It is difficult to fully simulate them under the limited number of tests and test conditions, which makes this determination method face many challenges in practical applications.

[0005] The second method is to rely on finite element software to predict the strength of battery pack parts. In the current research field, related research results such as "A vibration fatigue simulation test method for new energy vehicle battery packs based on CAE" with patent number 201811593687.9 and "A vibration stress and fatigue life prediction method for battery pack systems" with patent number 202210446346.9, mostly focus on the strength of the battery pack shell of electric vehicles. This is because the battery pack of electric vehicles is different from that of two-wheeled vehicles in terms of structure and usage scenarios. When using finite element software for analysis, in order to simplify the calculation process and improve analysis efficiency, some simplifications are often made to the relevant battery modules inside the battery pack. However, for the battery pack of new energy electric two-wheeled vehicles, it has its own unique structural characteristics, and the key focus of its vibration strength is mainly concentrated in the battery module area. Since the body structure of two-wheeled vehicles is relatively small and flexible, the vibration transmission path and vibration characteristics during driving are different from those of electric vehicles. The battery module is more susceptible to direct vibration, which in turn affects the performance of the battery. Therefore, the existing analysis method based on finite element software cannot fit the actual situation of two-wheeled vehicle battery packs well, and there is a large deviation in evaluating its vibration intensity.

[0006] Based on the above, it can be seen that the existing battery pack vibration strength determination methods have their own shortcomings when applied to the battery pack of new energy electric two-wheeled vehicles. In view of this, it is urgent to provide a model building method that can improve the vibration simulation accuracy of this type of battery pack, so as to more accurately and efficiently evaluate the vibration strength of the battery pack, thereby ensuring the safety and reliability of the battery pack of new energy electric two-wheeled vehicles and promoting the healthy and stable development of this field. Summary of the invention

[0007] The embodiments of the present application provide a method and device for vibration simulation of a battery pack model. By filling a gap layer with an extremely low modulus between the battery and the battery bracket, the correlation and independence between the battery and the bracket are ensured, thereby improving the simulation accuracy.

[0008] In a first aspect, an embodiment of the present application provides a method for performing vibration simulation on a battery pack model, the method comprising: Performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and meshing the first simulation model, wherein at least three layers of meshes are divided for the heat affected area of ​​the bus; Acquire an actual gap distance between the battery and the battery holder, mesh the gap between the equivalent battery model and the battery holder model in HyperMesh based on the actual gap distance to obtain a gap layer, and add the gap layer to the first simulation model to obtain a second simulation model; Obtaining material parameters of each material type used in the battery pack, and defining the material parameters to corresponding battery pack components in the second simulation model to obtain a third simulation model, wherein the material parameters of the gap layer are set to fixed values, the material parameters including density, Young's modulus, and Poisson's ratio; Use Workbench to perform vibration simulation on the third simulation model.

[0009] In a second aspect, an embodiment of the present application provides a device for performing vibration simulation on a battery pack model, comprising: A modeling module, used for performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and meshing the first simulation model, wherein at least three layers of mesh are divided for the heat affected area of ​​the bus; A gap layer building module, used to obtain the actual gap distance between the battery and the battery holder, mesh the gap between the equivalent battery model and the battery holder model in HyperMesh based on the actual gap distance to obtain a gap layer, and add the gap layer to the first simulation model to obtain a second simulation model; A definition module, used for obtaining material parameters of each material type used in the battery pack, and defining the material parameters to corresponding battery pack components in the second simulation model to obtain a third simulation model, wherein the material parameters of the gap layer are set to fixed values, and the material parameters include density, Young's modulus and Poisson's ratio; The simulation module uses Workbench to perform vibration simulation on the third simulation model.

[0010] In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute a method for vibration simulation of a battery pack model.

[0011] In a fourth aspect, an embodiment of the present application provides a readable storage medium, in which a computer program is stored. The computer program includes a program code for controlling a process to execute a process, and the process includes a method for vibration simulation of a battery pack model.

[0012] The main contributions and innovations of the present invention are as follows: The embodiment of the present application constructs an equivalent battery model to replace the fine grid battery model, which greatly reduces the number of grids and thus shortens the calculation time; the present solution adopts a gap layer to fill the gap between the battery and the battery holder, and sets extremely small material parameters for the gap layer, which not only improves the accuracy of the vibration simulation results, but also ensures the correlation and mutual independence between the battery and the battery holder; the present solution replaces the spot welding between the bus and the battery with a beam unit of a welding point to ensure that the connection method between the battery and the bus is consistent with the actual situation; the bus is divided into a spot welding area, a heat-affected zone and other areas, and the influence of spot welding on the strength performance of the material is considered, thereby improving the simulation accuracy.

[0013] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 is a flow chart of a method for performing vibration simulation on a battery pack model according to an embodiment of the present application; Figure 2 is a structural schematic diagram of an equivalent battery model according to an embodiment of the present application; Figure 3 is an exploded diagram of a first simulation model according to an embodiment of the present application; Figure 4 is a schematic diagram of a bus area division result according to an embodiment of the present application; Figure 5 is a schematic structural diagram of a gap layer according to an embodiment of the present application; Figure 6 is a structural block diagram of a device for performing vibration simulation on a battery pack model according to an embodiment of the present application; Figure 7 It is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0015] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with one or more embodiments of this specification. Instead, they are merely examples of devices and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0016] It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described in this specification. In some other embodiments, the steps included in the method may be more or less than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; and multiple steps described in this specification may be combined into a single step for description in other embodiments.

[0017] In order to better understand the present solution, the structure of the battery pack for a two-wheeled vehicle is described here. The battery pack components include at least an upper shell 1, a waterproof structure 2, an aluminum barrel 3, a bus 4, a lower shell 5, a battery 6, a PCB board 7, a battery bracket 8 and a silicone pad 9, wherein the upper shell 1 and the lower shell 5 cooperate with each other and are fixed together with the aluminum barrel, the bracket and other components by bolts and other connection methods, so that the entire battery pack forms a tight overall structure; the waterproof structure 2 is used to improve the sealing of the battery pack to prevent dust, moisture and other external impurities from entering the battery pack; the aluminum barrel 3 plays a key role in protecting the internal components, and its solid material can withstand external physical impacts and prevent internal batteries, bus bars and other components from being damaged. At the same time, it provides an installation basis for other components to ensure that the components are arranged in order in the battery pack; the bus 4 is responsible for collecting and distributing the current generated by the battery to achieve electrical connection between battery modules. It is connected to the battery by spot welding to gather the power of multiple batteries and provide stable power output for external devices. The busbar is divided into spot welding area, heat affected area and other areas. The spot welding area realizes electrical connection with the battery. The heat affected area will change the material properties due to the spot welding process. The battery 6 is the core component of the battery pack. Its main function is to store and release electric energy to provide power support for the two-wheeled vehicle. The battery is connected to other components through the busbar to realize the transmission and distribution of current. The PCB board 7 is used to collect various parameters of the battery, such as voltage, current, temperature, etc. These data are essential for monitoring the working status of the battery pack and ensuring the safety and efficient operation of the battery. The acquisition board is usually connected to the battery and other control components to transmit the collected data to the battery management system (BMS) so that the BMS can monitor and control the battery pack in real time. The battery bracket 8 is mainly used to support and fix the battery and other components to ensure their stable position in the battery pack. It has a connection relationship with the battery 6, the upper shell 1, the lower shell 5, the aluminum barrel 3 and other components. Through reasonable structural design and connection methods, the various components are closely combined together to jointly withstand external forces such as vibration. The silicone pad 9 has good buffering performance. In the battery pack, it is mainly used to fill the gaps between components, thereby buffering vibrations and reducing friction and wear between components.

[0018] Embodiment 1 The embodiment of the present application provides a method for vibration simulation of a battery pack model, by filling a gap layer with extremely low modulus between the battery and the battery bracket, the correlation and independence between the battery and the bracket are ensured, thereby improving the simulation accuracy. Specifically, refer to Figure 1 , the method comprising: Performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and meshing the first simulation model, wherein at least three layers of meshes are divided for the heat affected area of ​​the bus; Acquire an actual gap distance between the battery and the battery holder, mesh the gap between the equivalent battery model and the battery holder model in HyperMesh based on the actual gap distance to obtain a gap layer, and add the gap layer to the first simulation model to obtain a second simulation model; Obtaining material parameters of each material type used in the battery pack, and defining the material parameters to corresponding battery pack components in the second simulation model to obtain a third simulation model, wherein the material parameters of the gap layer are set to fixed values, the material parameters including density, Young's modulus, and Poisson's ratio; Use Workbench to perform vibration simulation on the third simulation model.

[0019] In some embodiments, a fine grid model is constructed for the battery model and the real material parameters of the battery are input to obtain a grid battery model. Envelope equivalent modeling is performed on the battery model and equivalent density, equivalent modulus and equivalent Poisson's ratio are input to obtain a first battery model. The vibration mode consistency of the first battery model and the grid battery model and the modal difference under the same order are calculated. If the vibration mode of the first battery model is inconsistent with that of the grid battery model or / and the modal difference under the same order is greater than the set difference, the equivalent density, equivalent modulus and equivalent Poisson's ratio are adjusted and the vibration mode consistency and the modal difference under the same order are recalculated. If the vibration mode of the first battery model is consistent with that of the grid battery model and the modal difference under the same order is less than or equal to the set difference, the first battery model is used as an equivalent battery model, wherein the calculation formula of the equivalent density is:

[0020] Among them, m is the equivalent density, ρ is the battery weight, v is the battery volume, and the equivalent modulus is defined as the constitutive form of various anisotropic materials. That is to say, the equivalent modulus is mainly based on the vibration mode results of the detailed model in the first few modes to judge the axial and radial stiffness of the battery. If the first order is axial vibration and the second order is radial vibration, the radial modulus of the battery is greater than the axial modulus. Then, the equivalent moduli are preliminarily defined with reference to the battery shell modulus, and then the axial and radial modulus values ​​of the battery are adjusted according to the size of the modal value. If the vibration mode of the equivalent battery is consistent with the vibration mode of the detailed model but the mode is too large, it is necessary to reduce the modulus in this direction and define the equivalent Poisson's ratio based on the battery shell material.

[0021] Specifically, the structure of the equivalent battery model is as follows Figure 2 As shown, in the process of envelope equivalent modeling of the battery model, HyperMesh is used to remove small features and internal structures in the battery model, and a first grid size is set, and the first grid size is used for envelope equivalent modeling. That is to say, by removing small features in the battery model, the grid division can be reduced, and the number of grids can be reduced to about one third to one quarter of the original, thereby reducing the calculation time.

[0022] Specifically, the equivalent modulus is defined as anisotropic material constitutive factors, which is beneficial for later rigid adjustment of the equivalent modulus in the X, Y and Z directions according to the vibration mode and the modal difference under the same order.

[0023] For example, the setting of the equivalent Poisson's ratio is related to the shell material of the battery, for example, the Poisson's ratio of a steel shell is 0.28, and the Poisson's ratio of an aluminum shell is 0.3.

[0024] Specifically, a comparison scheme is established, and the first five modal values ​​are solved respectively, wherein the first five modal values ​​are equivalent moduli, vibration modes and differences of the moduli in the X, Y and Z directions.

[0025] In some embodiments, the exploded diagram of the first simulation model is as follows: Figure 3 As shown, the first simulation model includes an upper shell 1, a waterproof structure 2, an aluminum barrel 3, a bus 4, a lower shell 5, a battery 6, a PCB board 7, a battery bracket 8 and a silicone pad 9. In HyperMesh, the points, lines and surfaces that do not affect the calculation results are removed from the first simulation model.

[0026] Specifically, in the process of importing the geometric models of the equivalent battery model and other battery pack components in the battery pack into HyperMesh, there may be some redundant points, lines, and surfaces. These structures have no effect on the calculation results of the vibration simulation and will increase the amount of calculation. Therefore, the built-in functions of HyperMesh are used to remove these points, lines, and surfaces.

[0027] In some embodiments, in the step of "meshing the first simulation model", each component in the first simulation model except the equivalent battery model is meshed using hexahedral mesh units. If there are components that cannot be meshed using hexahedral mesh units, tetrahedral mesh units are used for meshing.

[0028] Specifically, the components in the first simulation model are meshed according to the geometric features of different components, and since the meshing of the equivalent battery model has been completed in the envelope equivalent modeling, there is no need to mesh the equivalent battery model again during the meshing of the first simulation model.

[0029] Specifically, when performing mesh division, the hexahedral mesh unit can better express the geometric characteristics of each component, but the hexahedral mesh has high requirements on the shape. When there are some components with complex structures, irregular surfaces or corners, the hexahedral mesh may not be able to accurately fit the corresponding components, so tetrahedral mesh units are used to divide the irregular components.

[0030] In some embodiments, a solid bolt model is used to connect key components in the first simulation model, and corresponding washer layers are formulated for connection holes between non-key components in the first simulation model according to corresponding bolt sizes, and Bar units and GERIG units are used to capture Washer layer nodes instead of solid bolt connections, wherein the connection between the upper shell 1, the lower shell 5 and the aluminum barrel 3 of the first simulation model is a connection between non-key components, and the connections of other battery pack components are all key.

[0031] Specifically, when meshing and connecting the battery pack-related structures, different mesh units are selected according to the structural characteristics, the connection holes in non-key areas are simplified, and solid bolt connections are used in key areas. This can improve the calculation efficiency, reduce the amount of calculation by reasonably selecting mesh units and simplifying the connections in non-key areas, and ensure the calculation accuracy. The solid bolt connection in the key area can accurately simulate the mechanical properties, and balance the model accuracy and calculation cost, avoiding overall over-fine simulation, ensuring the accuracy of key areas while controlling costs, and providing an efficient and accurate model basis for battery pack vibration simulation analysis.

[0032] In some embodiments, a center surface is drawn for the bus in the first simulation model, and the bus is divided into a spot welding area, a heat affected zone and other areas according to the actual spot welding area of ​​the bus, wherein the other areas are areas of the bus excluding the spot welding area and the heat affected zone, and the spot welding area is subjected to network encryption processing.

[0033] Specifically, the bus area division results are as follows: Figure 4 As shown, in Figure 4The heat affected zone 402 includes a spot welding area 401, a heat affected zone 402 and other areas 403. Since the material properties and material thickness of the heat affected zone are changed due to the influence of welding, in order to better show the vibration simulation effect of the heat affected zone, at least 3 layers of grids are set for the heat affected zone.

[0034] In some embodiments, the installation gap between the battery and the battery holder is manually measured to obtain the actual gap distance, and the gap between the equivalent battery model and the battery holder model is meshed using the actual gap distance to obtain a gap layer. The structure of the gap layer is as follows: Figure 5 As shown, in Figure 5 The battery 6 and the gap layer 601 are included.

[0035] Specifically, the actual gap distance measured in this solution is 0.05mm. Through precise measurement and modeling, the actual assembly state between the battery and the bracket can be truly restored, making the simulation model more in line with the actual situation. In addition, during vibration simulation analysis, the interaction between the battery and the bracket can be more accurately simulated, including force conduction, relative displacement, etc.

[0036] In this solution, since the linear analysis method is mainly used to analyze the vibration intensity problem, all materials are regarded as elastic materials, so the material parameters of each material type used in the battery pack are defined to the corresponding battery pack components in the second simulation model. Since the gap layer in this solution only serves to connect the battery and the bracket, the material parameters of the gap layer are set to fixed values, and it is ensured that the material parameters of the gap layer have little effect on the results. Specifically, the density of the gap layer is set to 1.0e -11 , Young’s modulus was set to 0.5, and Poisson’s ratio was set to 0.4.

[0037] Specifically, the material parameters of some materials used in the battery pack are shown in Table 1: Table 1

[0038] In some embodiments, in the third simulation model, the connection relationship between the components is defined, wherein the spot welding between the bus and the battery is defined as a beam unit, the connection relationship between the gap layer and the battery is defined as a binding contact, and the connection relationship between the gap layer and the battery bracket is defined as a binding contact.

[0039] Specifically, defining the spot welding between the busbar and the battery as a beam unit can ensure that the connection method between the battery and the busbar is consistent with the actual situation.

[0040] Furthermore, after the spot welding between the busbar and the battery is defined as a beam unit, the busbar and the battery are connected to each other by sharing nodes with the mesh of the busbar welding point area and binding contact with the corresponding area of ​​the battery.

[0041] Specifically, the battery pack is composed of multiple components, some of which are fixedly connected. In the third simulation model, the fixedly connected components are defined as binding contacts.

[0042] Specifically, by defining the connection relationship between the gap layer and the battery and the battery holder as a binding contact, the correlation and mutual independence of the battery and the battery holder are ensured.

[0043] In some specific embodiments, the third simulation model is exported as a .cdb file, and the third simulation model in .cdb format is imported into Workbench using Mechanical APDL to perform vibration simulation.

[0044] In some embodiments, in the step of "using Workbench to perform vibration simulation on the third simulation model", a battery pack modal analysis is performed on the third simulation model to obtain modal values ​​and vibration modes, a random vibration analysis is performed on the modal values, a harmonic response analysis is performed on the vibration modes, and the random vibration analysis results and the harmonic response analysis results are used as vibration simulation results.

[0045] The modal analysis results are subjected to random vibration analysis and harmonic response analysis to obtain vibration simulation results.

[0046] Specifically, the modal analysis of the third simulation model is performed through dedicated modal analysis software such as Ansys Discovery and ModalVIEW, and the results of the modal analysis are the modal values ​​and vibration shapes of the third simulation model.

[0047] After performing a modal analysis on the battery pack of the third simulation model to obtain the modal analysis results, determine whether the random vibration analysis results and the harmonic response analysis results are in a reasonable range. If they are not in a reasonable range, check and troubleshoot the material parameters and connection relationships in the third simulation model.

[0048] In some specific embodiments, the hardness of the heat-affected zone and the hardness of the area without spot welding in the busbar are measured by a hardness tester, and the yield strength of the heat-affected zone is calculated based on the hardness of the heat-affected zone and the hardness of the area without spot welding. The formula is as follows:

[0049] in, is the Vickers hardness of the heat affected zone, is the yield strength of the heat affected zone, is the Vickers hardness of the area not spot welded, is the yield strength of the area without spot welding.

[0050] In some specific embodiments, the stress of each component and each connection in the battery pack is obtained based on the vibration simulation results. If the stress of any component or any connection in the battery pack is less than or equal to 80% of the yield strength of the corresponding material, the component or the connection is considered qualified. If the stress of any component or any connection in the battery pack is greater than 80% of the yield strength of the corresponding material, it is necessary to re-optimize the corresponding component or structure, remodel it and construct a third simulation model.

[0051] Embodiment 2 Based on the same idea, refer to Figure 6 , the present application also proposes a device for vibration simulation of a battery pack model, comprising: A modeling module, used for performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and meshing the first simulation model, wherein at least three layers of mesh are divided for the heat affected area of ​​the bus; A gap layer building module, used to obtain the actual gap distance between the battery and the battery holder, mesh the gap between the equivalent battery model and the battery holder model in HyperMesh based on the actual gap distance to obtain a gap layer, and add the gap layer to the first simulation model to obtain a second simulation model; A definition module, used for obtaining material parameters of each material type used in the battery pack, and defining the material parameters to corresponding battery pack components in the second simulation model to obtain a third simulation model, wherein the material parameters of the gap layer are set to fixed values, and the material parameters include density, Young's modulus and Poisson's ratio; The simulation module uses Workbench to perform vibration simulation on the third simulation model.

[0052] Embodiment 3 This embodiment also provides an electronic device, referring to Figure 7 , comprises a memory 404 and a processor 402, wherein the memory 404 stores a computer program, and the processor 402 is configured to run the computer program to execute the steps in any of the above method embodiments.

[0053] Specifically, the processor 402 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0054] Among them, the memory 404 may include a large capacity memory 404 for data or instructions. For example, but not limitation, the memory 404 may include a hard disk drive (HDD), a floppy disk drive, a solid state drive (SSD), a flash memory, an optical disk, a magneto-optical disk, a tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In appropriate cases, the memory 404 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 404 may be inside or outside the data processing device. In a specific embodiment, the memory 404 is a non-volatile memory. In a specific embodiment, the memory 404 includes a read-only memory (ROM) and a random access memory (RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (Programmable Read-Only Memory, PROM for short), an erasable PROM (Erasable Programmable Read-Only Memory, EPROM for short), an electrically erasable PROM (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), an electrically alterable ROM (Electrically Alterable Read-Only Memory, EAROM for short) or a flash memory (FLASH) or a combination of two or more of these. In appropriate circumstances, the RAM may be a static random access memory (SRAM) or a dynamic random access memory (DRAM), wherein the DRAM may be a fast page mode dynamic random access memory 404 (FPMDRAM), an extended data output dynamic random access memory (EDODRAM), a synchronous dynamic random access memory (SDRAM), etc.

[0055] The memory 404 may be used to store or cache various data files required for processing and / or communication, as well as possible computer program instructions executed by the processor 402 .

[0056] The processor 402 implements any one of the methods for performing vibration simulation on a battery pack model in the above embodiments by reading and executing computer program instructions stored in the memory 404 .

[0057] Optionally, the electronic device may further include a transmission device 406 and an input / output device 408 , wherein the transmission device 406 is connected to the processor 402 , and the input / output device 408 is connected to the processor 402 .

[0058] The transmission device 406 can be used to receive or send data via a network. The above-mentioned network specific embodiments may include a wired or wireless network provided by a communication provider of the electronic device. In one embodiment, the transmission device includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one embodiment, the transmission device 406 can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0059] The input / output device 408 is used to input or output information. In this embodiment, the input information may be a geometric model of a battery pack component, material parameters, etc., and the output information may be a simulation vibration result, etc.

[0060] Optionally, in this embodiment, the processor 402 may be configured to perform the following steps through a computer program: Performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and meshing the first simulation model, wherein at least three layers of meshes are divided for the heat affected area of ​​the bus; Acquire an actual gap distance between the battery and the battery holder, mesh the gap between the equivalent battery model and the battery holder model in HyperMesh based on the actual gap distance to obtain a gap layer, and add the gap layer to the first simulation model to obtain a second simulation model; Obtaining material parameters of each material type used in the battery pack, and defining the material parameters to corresponding battery pack components in the second simulation model to obtain a third simulation model, wherein the material parameters of the gap layer are set to fixed values, the material parameters including density, Young's modulus, and Poisson's ratio; Use Workbench to perform vibration simulation on the third simulation model.

[0061] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0062] In general, various embodiments may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects of the invention may be implemented in hardware, while other aspects may be implemented in firmware or software executed by a controller, microprocessor, or other computing device, but the invention is not limited thereto. Although various aspects of the invention may be shown and described as block diagrams, flow charts, or using some other graphical representation, it should be understood that, as non-limiting examples, the boxes, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0063] Embodiments of the present invention may be implemented by computer software that is executable by a data processor of a mobile device, such as in a processor entity, or by hardware, or by a combination of software and hardware. Computer software or programs (also referred to as program products) including software routines, applets and / or macros may be stored in any device-readable data storage medium, and they include program instructions for performing specific tasks. A computer program product may include one or more computer executable components configured to perform an embodiment when the program is run. One or more computer executable components may be at least one software code or a portion thereof. In addition, at this point, it should be noted that, for example, Figure 7 Any block of the logic flow in the program may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions. The software may be stored on physical media such as memory chips or storage blocks implemented within a processor, magnetic media such as hard disks or floppy disks, and optical media such as, for example, DVDs and their data variants, CDs, etc. Physical media are non-transitory media.

[0064] Those skilled in the art should understand that the technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for vibration simulation of a battery pack model, characterized in that: The following steps are involved: Performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and meshing the first simulation model, wherein at least three layers of meshes are divided for the heat affected area of ​​the bus; Acquire an actual gap distance between the battery and the battery holder, mesh the gap between the equivalent battery model and the battery holder model in HyperMesh based on the actual gap distance to obtain a gap layer, and add the gap layer to the first simulation model to obtain a second simulation model; Obtaining material parameters of each material type used in the battery pack, and defining the material parameters to corresponding battery pack components in the second simulation model to obtain a third simulation model, wherein the material parameters of the gap layer are set to fixed values, the material parameters including density, Young's modulus, and Poisson's ratio; Use Workbench to perform vibration simulation on the third simulation model.

2. The method for performing vibration simulation on a battery pack model according to claim 1, characterized in that: A fine grid model is constructed for the battery model and the real material parameters of the battery are input to obtain a grid battery model. Envelope equivalent modeling is performed on the battery model and equivalent density, equivalent modulus and equivalent Poisson's ratio are input to obtain a first battery model. The vibration mode consistency of the first battery model and the grid battery model and the modal difference under the same order are calculated. If the vibration mode of the first battery model is inconsistent with that of the grid battery model or / and the modal difference under the same order is greater than the set difference, the equivalent density, equivalent modulus and equivalent Poisson's ratio are adjusted and the vibration mode consistency and the modal difference under the same order are recalculated. If the vibration mode of the first battery model is consistent with that of the grid battery model and the modal difference under the same order is less than or equal to the set difference, the first battery model is used as an equivalent battery model, wherein the equivalent density is calculated based on the simplified battery volume and battery weight, the equivalent modulus is defined as anisotropic material constitutive, and the equivalent Poisson's ratio is defined based on the battery shell material.

3. The method for performing vibration simulation on a battery pack model according to claim 1, characterized in that: In the step of "meshing the first simulation model", each component except the equivalent battery model in the first simulation model is meshed using hexahedral mesh units. If there are components that cannot be meshed using hexahedral mesh units, tetrahedral style units are used for meshing.

4. The method for performing vibration simulation on a battery pack model according to claim 1, characterized in that: The key components in the first simulation model are connected using a solid bolt model. The connection holes between non-key components in the first simulation model are assigned corresponding washer layers according to the corresponding bolt sizes, and the Bar unit and GERIG unit are used to capture the Washer layer nodes instead of the solid bolt connections.

5. The method for vibration simulation of a battery pack model according to claim 1, characterized in that: The center surface of the bus in the first simulation model is extracted, and the bus is divided into a spot welding area, a heat affected zone and other areas according to the actual spot welding area of ​​the bus. The other areas are the areas of the bus except the spot welding area and the heat affected zone, and the spot welding area is subjected to network encryption processing.

6. The method for vibration simulation of a battery pack model according to claim 1, characterized in that: In the third simulation model, the connection relationship between the components is defined, wherein the spot welding between the busbar and the battery is defined as a beam unit, the connection relationship between the gap layer and the battery is defined as a binding contact, and the connection relationship between the gap layer and the battery holder is defined as a binding contact.

7. The method for performing vibration simulation on a battery pack model according to claim 1, characterized in that: In the step of "using Workbench to perform vibration simulation on the third simulation model", a battery pack modal analysis is performed on the third simulation model to obtain modal values ​​and vibration modes, a random vibration analysis is performed on the modal values, a harmonic response analysis is performed on the vibration modes, and the random vibration analysis results and the harmonic response analysis results are used as vibration simulation results.

8. A device for vibration simulation of a battery pack model, characterized in that: include: A modeling module, used for performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and meshing the first simulation model, wherein at least three layers of mesh are divided for the heat affected area of ​​the bus; A gap layer building module, used to obtain the actual gap distance between the battery and the battery holder, mesh the gap between the equivalent battery model and the battery holder model in HyperMesh based on the actual gap distance to obtain a gap layer, and add the gap layer to the first simulation model to obtain a second simulation model; A definition module, used for obtaining material parameters of each material type used in the battery pack, and defining the material parameters to corresponding battery pack components in the second simulation model to obtain a third simulation model, wherein the material parameters of the gap layer are set to fixed values, and the material parameters include density, Young's modulus and Poisson's ratio; The simulation module uses Workbench to perform vibration simulation on the third simulation model.

9. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to run the computer program to execute a method for vibration simulation of a battery pack model as described in any one of claims 1-7.

10. A readable storage medium, characterized in that: The readable storage medium stores a computer program, wherein the computer program includes a program code for controlling a process to execute a process, wherein the process includes a method for vibration simulation of a battery pack model according to any one of claims 1-7.

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