Method and device for vibrating simulation of battery pack model

Abstract

The present application proposes a method and device for vibration simulation of a battery pack model, including the following steps: performing envelope equivalent modeling on the battery to obtain an equivalent battery model, and importing the equivalent battery model and the geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model; obtaining the actual gap distance between the battery and the battery bracket to obtain a gap layer, and adding the gap layer to the first simulation model to obtain a second simulation model; defining the material parameters of each material type used in the battery pack to the corresponding battery pack components in the second simulation model to obtain a third simulation model; performing vibration simulation on the third simulation model using Workbench. This solution fills the gap between the battery and the battery bracket with a gap layer having an extremely low modulus, ensuring the correlation and mutual independence between the battery and the bracket, thereby improving the simulation accuracy.

Description

Technical Field

[0001] The present application relates to the field of battery detection, and particularly to a method and device for vibrating simulation of a battery pack model. Background Art

[0002] In today's society, with the continuous penetration of the environmental protection concept and the continuous progress of technology, new energy electric two-wheelers for personal transportation have gradually become one of the popular choices for people's short-distance travel. As the most critical power source of such vehicles, the battery pack undoubtedly shoulders the important mission of ensuring the normal operation of the vehicle, and its safety and reliability issues have thus attracted increasing attention from all walks of life.

[0003] From the perspective of mechanical reliability, the vibration intensity of the battery pack is one of the extremely important evaluation contents. Because in the actual use process of electric two-wheelers for personal transportation, whether driving on flat urban roads, or passing through slightly bumpy rural roads, or encountering various vibrations during transportation, etc., the battery pack will be affected by vibrations to varying degrees. If there are hidden dangers in the vibration intensity 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 the battery module performance, thereby affecting the overall service life of the battery pack and the safe and stable operation of the vehicle.

[0004] Currently, there are mainly two common methods for determining the vibration intensity of the battery pack. The first method is to conduct vibration tests on the battery pack according to relevant industry standards, and then conduct standard charge and discharge tests on it to determine whether the battery pack can meet the corresponding requirements. Specifically, when implementing the vibration test, it is necessary to first complete the production of the battery pack before placing it on professional vibration test equipment to simulate various vibration situations that may be encountered in actual use according to parameters such as the set 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 physical production of the battery pack, this means that if problems are found during the test, it is necessary to redesign and optimize the structure of the battery pack, then produce the product again and conduct a new round of tests. Repeating this process will consume a large amount of manpower, material resources, and valuable time costs. Moreover, more importantly, it is often difficult to detect all potential failure points of the battery pack only by one vibration test. After all, the vibration situations in actual use are complex and changeable, and there may be some extreme situations or the superposition of multiple vibration factors, which are difficult to fully simulate under limited test times and test conditions. This makes this determination method face many challenges in practical applications.

[0005] The second method relies 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 a new energy vehicle battery pack based on CAE" with the patent number 201811593687.9 and "A vibration stress and fatigue life prediction method for a battery pack system" with the patent number 202210446346.9 mostly focus on the strength of the battery pack housing of electric vehicles. This is because there are certain differences between the battery packs of electric vehicles and those of two-wheelers in terms of structure and usage scenarios. When using finite element software for analysis, in order to simplify the calculation process and improve the analysis efficiency, some simplification treatments are often carried out on the relevant battery modules inside the battery pack. However, for the battery pack of a new energy electric two-wheeler for daily use, it has unique structural characteristics, and the key focus of its vibration strength is mainly concentrated in the battery module area. Due to the relatively small and flexible body structure of two-wheelers, the vibration transmission path and vibration characteristics during driving are different from those of electric vehicles, and the battery modules are more likely to be directly affected by vibrations, thereby affecting the performance of the battery. Therefore, the existing analysis methods based on finite element software cannot well fit the actual situation of two-wheeler battery packs, and there are large deviations in evaluating their vibration strength.

[0006] From the above situation, it can be seen that when the existing methods for determining the vibration strength of battery packs are applied to the battery packs of new energy electric two-wheelers for daily use, they all have their own deficiencies. In view of this, there is an urgent need to provide a method for building a model 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 the new energy electric two-wheeler for daily use and promoting the healthy and stable development of this field. Summary of the Invention

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

[0008] In a first aspect, the embodiment of the present application provides a method for performing vibration simulation on a battery pack model, the method including:

[0009] Performing envelope equivalent modeling on the battery to obtain an equivalent battery model, importing the equivalent battery model and the geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and performing mesh division on the first simulation model, where at least three layers of meshes are divided for the thermal influence area of the busbar;

[0010] Obtain the actual gap distance between the battery and the battery bracket, perform mesh generation for the gap between the equivalent battery model and the battery bracket 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;

[0011] Obtain the material parameters of each material type used in the battery pack, and define the material parameters to the corresponding battery pack components in the second simulation model to obtain a third simulation model. Among them, set the material parameters of the gap layer to fixed values, and the material parameters include density, Young's modulus, and Poisson's ratio;

[0012] Use Workbench to perform a vibration simulation on the third simulation model.

[0013] In a second aspect, an embodiment of the present application provides a device for performing a vibration simulation on a battery pack model, including:

[0014] A modeling module, configured to perform envelope equivalent modeling on the battery to obtain an equivalent battery model, import the equivalent battery model and the geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and perform mesh generation on the first simulation model, where at least three layers of meshes are divided for the heat affected area of the busbar;

[0015] A gap layer construction module, configured to obtain the actual gap distance between the battery and the battery bracket, perform mesh generation for the gap between the equivalent battery model and the battery bracket 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;

[0016] A definition module, configured to obtain the material parameters of each material type used in the battery pack, and define the material parameters to the corresponding battery pack components in the second simulation model to obtain a third simulation model. Among them, set the material parameters of the gap layer to fixed values, and the material parameters include density, Young's modulus, and Poisson's ratio;

[0017] A simulation module, which uses Workbench to perform a vibration simulation on the third simulation model.

[0018] In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute a method for performing a vibration simulation on a battery pack model.

[0019] Fourthly, an embodiment of the present application provides a readable storage medium, in which a computer program is stored. The computer program includes program codes for controlling a process to execute the process, and the process includes a method for performing vibration simulation on a battery pack model.

[0020] The main contributions and innovations of the present invention are as follows:

[0021] The embodiment of the present application replaces the battery model with fine grids by constructing an equivalent battery model, greatly reducing the number of grids and thus shortening the calculation time. In this solution, a void layer is filled between the battery and the battery bracket, and extremely small material parameters are set for the void 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 bracket. In this solution, the spot welding between the busbar and the battery is replaced by beam elements of the solder joints to ensure that the connection method between the battery and the busbar is consistent with the actual situation. The busbar is divided into a spot welding area, a heat affected zone, and other areas, considering the influence of spot welding on the material strength performance, thereby improving the simulation accuracy.

[0022] The details of one or more embodiments of the present application are set forth in the following drawings and description to make the other features, objects, and advantages of the present application more comprehensible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and form 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 to the present application. In the drawings:

[0024] Figure 1 is a flowchart of a method for performing vibration simulation on a battery pack model according to an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of an equivalent battery model according to an embodiment of the present application;

[0026] Figure 3 is an exploded view of a first simulation model according to an embodiment of the present application;

[0027] Figure 4 is a schematic diagram of the regional division result of a busbar according to an embodiment of the present application;

[0028] Figure 5 is a schematic structural diagram of a void layer according to an embodiment of the present application;

[0029] 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;

[0030] Figure 7 It is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present application. Detailed implementation

[0031] Here, exemplary embodiments will be described in detail, and examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with one or more embodiments of this specification. On the contrary, 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.

[0032] It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily executed 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 also be combined into a single step for description in other embodiments.

[0033] 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.

[0034] Embodiment 1

[0035] 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:

[0036] 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;

[0037] 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;

[0038] 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;

[0039] Use Workbench to perform vibration simulation on the third simulation model.

[0040] 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:

[0041]

[0042] 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.

[0043] Specifically, the structure of the equivalent battery model is as follows Figure 2 As shown, during the process of envelope equivalent modeling of the battery model, small features and internal structures in the battery model are removed through HyperMesh, and the first mesh size is set, and the first mesh size is used for envelope equivalent modeling. That is to say, by removing small features in the battery model, mesh division can be reduced, and the number of meshes can be reduced to about one-third to one-fourth of the original, thereby reducing the calculation time.

[0044] Specifically, the definition of the equivalent modulus as the constitutive of anisotropic materials 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 at the same order.

[0045] Exemplarily, the setting of the equivalent Poisson's ratio is related to the outer shell material of the battery. For example, the Poisson's ratio of the steel material outer shell is 0.28, and the Poisson's ratio of the aluminum material outer shell is 0.3.

[0046] Specifically, by establishing a comparison scheme and solving the first five-order modal values respectively, where the first five-order modal values are the equivalent modulus, vibration mode, and the difference of each modulus in the X, Y, and Z directions.

[0047] In some embodiments, the exploded view 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 bar 4, a lower shell 5, a battery 6, a PCB board 7, a battery bracket 8, and a silica gel pad 9. Points, lines, and surfaces that do not affect the calculation results are removed from the first simulation model in HyperMesh.

[0048] Specifically, during 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 influence on the calculation results of the vibration simulation and will increase the calculation amount, so the built-in functions of HyperMesh are used to remove these points, lines, and surfaces.

[0049] 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 divided using hexahedral mesh elements. If there are components that cannot be divided using hexahedral mesh elements, tetrahedral mesh elements are used for division.

[0050] Specifically, the components in the first simulation model are meshed according to the geometric characteristics 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 process of meshing the first simulation model.

[0051] Specifically, when performing mesh division, hexahedral mesh elements can better represent the geometric features of each component. However, hexahedral meshes have high requirements for shape. When there are some components with complex structures, irregular curved surfaces or corners, the hexahedral mesh may not be able to accurately fit the corresponding components. Therefore, tetrahedral mesh elements are used to divide the irregular components.

[0052] In some embodiments, solid bolt models are used to connect the key components in the first simulation model. For the connection holes between non-key components in the first simulation model, corresponding washer layers are formulated according to the size of the corresponding bolts, and the method of using Bar elements and GERIG elements to capture the nodes of the washer layer is used instead of solid bolt connections. Among them, the connections between the upper shell 1, the lower shell 5 and the aluminum barrel 3 of the first simulation model are connections between non-key components, and the connections of the remaining battery pack components are all key points.

[0053] Specifically, when performing mesh division and connection method processing on the battery pack-related structures, different mesh elements are selected according to the structural characteristics, the connection holes in the non-key areas are simplified, and solid bolt connections are used in the key areas. This can improve the calculation efficiency, reduce the calculation amount by reasonably selecting mesh elements and simplifying the connections in non-key areas, ensure the calculation accuracy, and the solid bolt connections in the key areas can accurately simulate the mechanical properties, and can also balance the model accuracy and calculation cost, avoid overall over-fine simulation, ensure the accuracy of the key areas while controlling the cost, and provide an efficient and accurate model basis for the vibration simulation analysis of the battery pack.

[0054] In some embodiments, the mid-surface of the busbar in the first simulation model is extracted, and the busbar is divided into a spot welding area, a heat affected area and other areas according to the actual spot welding area of the busbar. The other areas are the areas of the busbar except the spot welding area and the heat affected area, and network encryption processing is performed on the spot welding area.

[0055] Specifically, the regional division results of the busbar are as Figure 4 shown, in Figure 4 which include a spot welding area 401, a heat affected area 402 and other areas 403. Since the material properties and material thickness of the heat affected area change due to the influence of welding, in order to better display the vibration simulation effect of the heat affected area, at least 3 layers of meshes are set for the heat affected area.

[0056] In some embodiments, the actual gap distance is obtained by manually measuring the installation gap between the battery and the battery bracket, and the gap layer is obtained by performing mesh division on the gap between the equivalent battery model and the battery bracket model using the actual gap distance. The structure of the gap layer is as Figure 5 shown, in Figure 5 which includes a battery 6 and a gap layer 601.

[0057] Specifically, the actual void distance measured in this solution is 0.05 mm. By 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. Moreover, during the vibration simulation analysis, the interaction between the battery and the bracket can be more accurately simulated, including the conduction of force, relative displacement, and other situations.

[0058] In this solution, since the linear analysis method is mainly used to analyze the vibration intensity problem, all materials are regarded as elastic materials. Therefore, the material parameters of each material type used in the battery pack are defined for the corresponding battery pack components in the second simulation model. And since the void layer in this solution only serves to connect the battery and the bracket, the material parameters of the void layer are set to fixed values, and it is ensured that the influence of the material parameters of the void layer on the results is extremely small. Specifically, the density of the void layer is set to 1.0e -11 , the Young's modulus is set to 0.5, and the Poisson's ratio is set to 0.4.

[0059] Specifically, the material parameters of some materials used in the battery pack are shown in Table 1:

[0060] Table 1

[0061]

[0062] In some embodiments, in the third simulation model, the connection relationships between the components are defined. Among them, the spot weld between the bus bar and the battery is defined as a beam element, the connection relationship between the void layer and the battery is defined as a bonded contact, and the connection relationship between the void layer and the battery bracket is defined as a bonded contact.

[0063] Specifically, defining the spot weld between the bus bar and the battery as a beam element can ensure that the connection method between the battery and the bus bar is consistent with the actual situation.

[0064] Furthermore, after defining the spot weld between the bus bar and the battery as a beam element, by sharing nodes with the grid in the solder joint area of the bus bar and making a bonded contact with the corresponding area of the battery, the correlation between the bus bar and the battery is established.

[0065] Specifically, the battery pack is composed of multiple components, and some components are fixedly connected. In the third simulation model, the fixedly connected components are defined as bonded contacts.

[0066] Specifically, defining the connection relationships between the void layer and the battery and the battery bracket as bonded contacts ensures the correlation and mutual independence between the battery and the battery bracket.

[0067] 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 Mechancial APDL for vibration simulation.

[0068] 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 result and the harmonic response analysis result are used as the vibration simulation result.

[0069] A random vibration analysis and a harmonic response analysis are performed on the modal analysis results to obtain the vibration simulation result.

[0070] Specifically, a modal analysis is performed on the third simulation model using dedicated modal analysis software such as Ansys Discovery and ModalVIEW, and the results of the modal analysis are the modal values and vibration modes of the third simulation model.

[0071] After performing a battery pack modal analysis on the third simulation model to obtain the modal analysis results, it is determined whether the random vibration analysis result and the harmonic response analysis result are within a reasonable range. If they are not within the reasonable range, the material parameters and connection relationships in the third simulation model are checked for errors.

[0072] In some specific embodiments, the hardness of the heat-affected area and the hardness of the area where spot welding is not performed in the busbar are measured using a hardness tester, and the yield strength of the heat-affected area is calculated based on the hardness of the heat-affected area and the hardness of the area where spot welding is not performed. The formula is as follows:

[0073]

[0074] Where, is the Vickers hardness of the heat-affected area, is the yield strength of the heat-affected area, is the Vickers hardness of the area where spot welding is not performed, is the yield strength of the area where spot welding is not performed.

[0075] In some specific embodiments, the stress on each component and each connection in the battery pack is obtained based on the vibration simulation result. If the stress on 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 on any component or any connection in the battery pack is greater than 80% of the yield strength of the corresponding material, the corresponding component or structure needs to be optimized again, and a new model is built and the third simulation model is constructed again.

[0076] Embodiment 2

[0077] Based on the same concept, with reference to Figure 6 , this application also proposes a device for vibrating simulation of a battery pack model, including:

[0078] A modeling module, which is used to perform envelope equivalent modeling on the battery to obtain an equivalent battery model, import the equivalent battery model and the geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and perform mesh division on the first simulation model. Among them, at least 3 layers of meshes are divided for the thermal influence area of the busbar;

[0079] An air gap layer building module, which is used to obtain the actual air gap distance between the battery and the battery bracket, perform mesh division on the air gap between the equivalent battery model and the battery bracket model in HyperMesh based on the actual air gap distance to obtain an air gap layer, and add the air gap layer to the first simulation model to obtain a second simulation model;

[0080] A definition module, which is used to obtain the material parameters of each material type used in the battery pack, and define the material parameters to the corresponding battery pack components in the second simulation model to obtain a third simulation model. Among them, the material parameters of the air gap layer are set to fixed values, and the material parameters include density, Young's modulus, and Poisson's ratio;

[0081] A simulation module, which uses Workbench to perform vibration simulation on the third simulation model.

[0082] Embodiment 3

[0083] This embodiment also provides an electronic device, with reference to Figure 7 , including a memory 404 and a processor 402. A computer program is stored in the memory 404, and the processor 402 is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0084] Specifically, the above-mentioned processor 402 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC for short), or may be configured as one or more integrated circuits implementing the embodiments of the present application.

[0085] Among them, the memory 404 may include a mass storage 404 for data or instructions. By way of example and 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 disc, a magneto-optical disc, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In a suitable case, the memory 404 may include removable or non-removable (or fixed) media. In a suitable case, the memory 404 may be internal or external to the data processing device. In a particular embodiment, the memory 404 is a non-volatile memory. In a particular embodiment, the memory 404 includes a read-only memory (ROM) and a random access memory (RAM). In a suitable case, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM), or a flash memory, or a combination of two or more of these. In a suitable case, the RAM may be a static random access memory (SRAM) or a dynamic random access memory (DRAM), where the DRAM may be a fast page mode dynamic random access memory (FPMDRAM), an extended data output dynamic random access memory (EDODRAM), a synchronous dynamic random access memory (SDRAM), etc.

[0086] The memory 404 can 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.

[0087] The processor 402 reads and executes the computer program instructions stored in the memory 404 to implement any one of the methods for vibrating simulation of the battery pack model in the above embodiments.

[0088] Optionally, the above electronic device may further include a transmission device 406 and an input / output device 408. Among them, the transmission device 406 is connected to the above processor 402, and the input / output device 408 is connected to the above processor 402.

[0089] The transmission device 406 can be used to receive or send data via a network. Specific embodiments of the above network may include wired or wireless networks provided by a communication provider of the electronic device. In one embodiment, the transmission device includes a network adapter (Network Interface Controller, abbreviated as NIC), which can be connected to other network devices through a base station and thus communicate with the Internet. In one embodiment, the transmission device 406 can be a radio frequency (RadioFrequency, abbreviated as RF) module, which is used to communicate with the Internet wirelessly.

[0090] The input / output device 408 is used to input or output information. In this embodiment, the input information can be the geometric model, material parameters, etc. of the battery pack components, and the output information can be the simulation vibration results, etc.

[0091] Optionally, in this embodiment, the above processor 402 can be set to execute the following steps through a computer program:

[0092] Perform envelope equivalent modeling on the battery to obtain an equivalent battery model, import the equivalent battery model and the geometric models of other battery pack components in the battery pack into HyperMesh to obtain a first simulation model, and perform mesh division on the first simulation model, where at least 3 layers of meshes are divided for the thermal influence area of the bus bar;

[0093] Obtain the actual gap distance between the battery and the battery bracket, perform mesh division on the gap between the equivalent battery model and the battery bracket 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;

[0094] Obtain the material parameters of each material type used in the battery pack, and define the material parameters to the corresponding battery pack components in the second simulation model to obtain the third simulation model. Among them, set the material parameters of the void layer to fixed values, and the material parameters include density, Young's modulus, and Poisson's ratio;

[0095] Use Workbench to perform vibration simulation on the third simulation model.

[0096] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and alternative embodiments, and will not be elaborated here.

[0097] Generally, various embodiments can be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects of the present invention can be implemented in hardware, while other aspects can be implemented by firmware or software executed by a controller, microprocessor, or other computing device. However, the present invention is not limited thereto. Although various aspects of the present invention can be shown and described as block diagrams, flowcharts, or using some other graphical representation, it should be understood that, as a non-limiting example, the blocks, devices, systems, techniques, or methods described herein can be implemented in hardware, software, firmware, dedicated circuits or logic, general hardware or a controller or other computing device, or some combination thereof.

[0098] Embodiments of the present invention can be implemented by computer software, which can be executed by a data processor of a mobile device, such as in a processor entity, or can be implemented by hardware, or by a combination of software and hardware. A computer software or program (also referred to as a program product), including software routines, applets, and / or macros, can be stored in any device-readable data storage medium, and they include program instructions for performing specific tasks. The computer program product can include one or more computer-executable components configured to execute the embodiments when the program runs. One or more computer-executable components can be at least one software code or a part thereof. Additionally, in this regard, it should be noted that any block in the logical flow, as Figure 7 shown, can represent a program step, or interconnected logical circuits, blocks, and functions, or a combination of program steps and logical circuits, blocks, and functions. The software can 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. The physical media is a non-transitory medium.

[0099] Those skilled in the art should understand that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification.

[0100] The above embodiments only represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, 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 appended claims.

Claims

1. A method for vibration simulation of a battery pack model, characterized in that: The following steps are involved: The battery is subjected to envelope equivalent modeling to obtain an equivalent battery model, wherein 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, the battery model is subjected to envelope equivalent modeling and the 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 the equivalent battery model, and the calculation formula of the equivalent density is: , m is the equivalent density, ρ is the battery weight, v is the battery volume, the equivalent battery model and the geometric models of other battery pack components in the battery pack are imported into HyperMesh to obtain a first simulation model, and the first simulation model is meshed, wherein at least three layers of mesh are divided for the heat affected area of ​​the busbar; 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: The equivalent modulus is defined as anisotropic material constitutive model, and the equivalent Poisson's ratio is defined based on the battery casing 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 vibration simulation of 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 is used to perform envelope equivalent modeling on the battery to obtain an equivalent battery model, wherein 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, the battery model is subjected to envelope equivalent modeling and the equivalent density, equivalent modulus and equivalent Poisson's ratio are input to obtain a first battery model, and 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 the equivalent battery model, and the calculation formula of the equivalent density is: , m is the equivalent density, ρ is the battery weight, v is the battery volume, the equivalent battery model and the geometric models of other battery pack components in the battery pack are imported into HyperMesh to obtain a first simulation model, and the first simulation model is meshed, wherein at least three layers of mesh are divided for the heat affected area of ​​the busbar; 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, which 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 according to any one of claims 1-7.

Images