Simulation analysis method and device for battery replacement battery system

Abstract

The embodiment of the invention provides a simulation analysis method and device for a battery replacement battery system, and the method comprises the steps: building a finite element analysis model of the battery replacement battery system, carrying out the mesh generation of the finite element analysis model, and enabling the battery replacement battery system to comprise a battery replacement subsystem and a battery subsystem, a locking mechanism pressure head of the battery changing subsystem is connected with a cushion block of the battery subsystem, and a precise guide structure of the battery changing subsystem is connected with the battery subsystem; determining loading conditions corresponding to simulation analysis of the finite element analysis model, wherein the loading conditions comprise a Z-direction degree of freedom of a connection point of a locking mechanism pressure head and a cushion block, and X-direction and Y-direction degrees of freedom of a connection point of a precise guide structure and a battery subsystem; performing simulation analysis on the finite element analysis model based on the grid division result and according to the loading condition to generate a simulation analysis result; and performing reliability analysis on the battery replacement battery system according to the simulation analysis result, and generating a corresponding reliability analysis result.

Description

Technical Field

[0001] The embodiments of this specification relate to the field of battery replacement technology, and in particular, to a simulation analysis method for a battery replacement system. Background Art

[0002] The battery swap system of new energy vehicles is a body component that plays a key role in improving vehicle performance. Components with insufficient structural strength may not be able to withstand the load during normal use, resulting in sudden failure of mechanical components or the entire system, causing safety risks. Therefore, new energy vehicles need to meet the requirements of structural strength while meeting the requirements of lightweight to ensure the safety of the vehicle. This requires fatigue simulation analysis of the battery swap system during the design phase, and optimization of its structure based on the results of fatigue analysis to improve structural durability.

[0003] In traditional structural strength simulation, it usually takes a lot of time and high costs, and the efficiency is relatively low. Therefore, the engineering community is increasingly using computer-aided engineering and numerical simulation technology to replace or assist traditional physical test methods to predict and evaluate the performance of structures, in order to improve efficiency, reduce costs and provide more comprehensive performance evaluation. These methods are usually more flexible and can simulate a variety of conditions, reduce the number of experiments, and accelerate product development. Based on the above advantages, a simulation analysis method suitable for the structural strength of new energy vehicle battery replacement systems has become the content that needs to be studied at present. Summary of the invention

[0004] In view of this, an embodiment of this specification provides a simulation analysis method for a battery replacement system. One or more embodiments of this specification also involve a simulation analysis device for a battery replacement system, a computing device, a computer-readable storage medium, and a computer program to solve the technical defects existing in the prior art.

[0005] According to a first aspect of an embodiment of this specification, a simulation analysis method for a battery replacement system is provided, including:

[0006] Establishing a finite element analysis model of a battery-swap system, and meshing the finite element analysis model to generate a meshing result, wherein the battery-swap system includes a battery-swap subsystem and a battery subsystem, the locking mechanism pressure head of the battery-swap subsystem is connected to the pad of the battery subsystem, and the precision guide structure of the battery-swap subsystem is connected to the battery subsystem;

[0007] Determining a loading condition corresponding to the simulation analysis of the finite element analysis model, wherein the loading condition includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constraining the X-direction and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem;

[0008] Based on the meshing result and according to the loading condition, the finite element analysis model is simulated and analyzed to generate corresponding simulation analysis results;

[0009] Perform reliability analysis on the battery replacement system based on the simulation analysis results to generate corresponding reliability analysis results.

[0010] Optionally, the pad includes a rubber pad, and the locking mechanism pressure head is rigidly connected to a shock absorbing and damping structure in the battery subsystem that includes the rubber pad;

[0011] Correspondingly, the loading condition also includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the shock absorbing and damping structure.

[0012] Optionally, the subsystem for exchanging electric energy is connected to the battery subsystem via a plurality of fixing points, each of which is a rigid unit;

[0013] Correspondingly, the loading conditions also include constraining the X, Y, and Z degrees of freedom of each fixed point.

[0014] Optionally, performing simulation analysis on the finite element analysis model according to the loading condition to generate corresponding simulation analysis results includes:

[0015] The finite element analysis model is simulated and analyzed by the Lanczos method according to the loading conditions to obtain the modal vibration shapes of the battery replacement system in the X, Y, and Z directions.

[0016] Optionally, before establishing the finite element analysis model of the battery replacement system, the method further includes:

[0017] Determine the unit system corresponding to the finite element model, and determine the unit type and unit quality requirements of each unit in the finite element model, wherein the thin-walled part structure in the battery replacement system is modeled by shell units, the adhesive and weld are modeled by solid units, and the hinge pin structure is modeled by beam units and rigid body units;

[0018] Accordingly, the establishment of a finite element analysis model of the battery replacement system includes:

[0019] A finite element analysis model of the battery replacement system is established based on the unit system, the unit type and the unit quality requirements.

[0020] Optionally, the simulation analysis method of the battery replacement system further includes:

[0021] Determine whether the battery replacement system meets the preset reliability conditions according to the reliability analysis result;

[0022] If so, the structure of the target battery replacement system is adjusted according to the finite element analysis model.

[0023] According to a second aspect of an embodiment of this specification, a simulation analysis device for a battery replacement system is provided, including:

[0024] An establishing module is configured to establish a finite element analysis model of a battery-swap system, and mesh the finite element analysis model to generate a meshing result, wherein the battery-swap system includes a battery-swap subsystem and a battery subsystem, a locking mechanism pressure head of the battery-swap subsystem is connected to a pad of the battery subsystem, and a precision guide structure of the battery-swap subsystem is connected to the battery subsystem;

[0025] a determination module configured to determine a loading condition corresponding to the simulation analysis of the finite element analysis model, wherein the loading condition includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constraining the X-direction and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem;

[0026] A simulation module, configured to perform simulation analysis on the finite element analysis model based on the meshing result and according to the loading condition, and generate corresponding simulation analysis results;

[0027] The analysis module is configured to perform reliability analysis on the battery replacement system according to the simulation analysis results and generate corresponding reliability analysis results.

[0028] According to a third aspect of an embodiment of this specification, a computing device is provided, including:

[0029] Memory and processor;

[0030] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement any step of the simulation analysis method of the battery replacement system.

[0031] According to the fourth aspect of the embodiments of this specification, a computer-readable storage medium is provided, which stores computer-executable instructions, and when the instructions are executed by a processor, the steps of any one of the simulation and analysis methods for the battery replacement system are implemented.

[0032] According to the fifth aspect of the embodiments of this specification, a computer program is provided, wherein when the computer program is executed in a computer, the computer is caused to execute the steps of the simulation analysis method of the above-mentioned battery replacement system.

[0033] An embodiment of the present specification provides a simulation and analysis method for a battery swap system, which establishes a finite element analysis model of the battery swap system and meshes the finite element analysis model to generate a meshing result, wherein the battery swap system includes a battery swap subsystem and a battery subsystem, the locking mechanism pressure head of the battery swap subsystem is connected to the pad of the battery subsystem, and the precision guide structure of the battery swap subsystem is connected to the battery subsystem; determining the loading conditions corresponding to the simulation and analysis of the finite element analysis model, wherein the loading conditions include constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constraining the X- and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem; based on the meshing result and according to the loading conditions, the finite element analysis model is simulated and analyzed to generate corresponding simulation analysis results; performing reliability analysis on the battery swap system according to the simulation analysis results to generate corresponding reliability analysis results. When performing simulation analysis on the battery replacement system, the embodiments of this specification constrain the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constrain the X- and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem. Performing simulation analysis in this constrained manner is beneficial to ensuring the accuracy of the analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a simulation analysis method of a battery replacement system provided by an embodiment of this specification;

[0035] Figure 2a It is a structural schematic diagram of a battery replacement system provided by an embodiment of this specification;

[0036] Figure 2b It is a structural schematic diagram of a sub-system for switching provided by an embodiment of this specification;

[0037] Figure 2c is a schematic diagram of the structure of a battery subsystem provided by an embodiment of this specification;

[0038] Figure 3 It is a processing flow chart of a simulation analysis method for a battery replacement system provided by an embodiment of this specification;

[0039] Figure 4 It is a structural schematic diagram of a simulation analysis device for a battery replacement system provided by an embodiment of this specification;

[0040] Figure 5 It is a structural block diagram of a computing device provided by an embodiment of this specification. DETAILED DESCRIPTION

[0041] Many specific details are described in the following description to facilitate a full understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of this specification, so this specification is not limited to the specific implementation disclosed below.

[0042] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a", "said" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0043] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0044] First, the terms involved in one or more embodiments of this specification are explained.

[0045] Finite Element Method (FEM): A method that uses mathematical approximation to simulate real physical systems (geometry and load conditions). By using simple and interacting elements (i.e. units), a finite number of unknowns can be used to approximate a real system with infinite unknowns.

[0046] With the continuous updating and iteration of new energy technologies, electric commercial vehicles have advantages over traditional fuel vehicles such as long driving range, low cost and zero pollution. The battery swapping market is booming, and there are many battery swapping battery systems on the market. Currently, the number of battery swapping commercial vehicles accounts for 20-30% of the market. In view of the reliability of the mechanical structure of the battery swapping system, China Automotive Technology and Research Center has drafted the safety requirements for battery swapping of electric commercial vehicles. The document requires that the battery swapping system can still be stable on the vehicle after the test, and the fasteners of the battery system, battery swapping mechanism, etc. should not be loose, deformed, broken, loose, etc.

[0047] Due to the large size and mass of the battery swapping system for N1, N2, and N3 vehicles, the high cost of safety and reliability testing and the long verification cycle, which greatly affects the speed of product updates and iterations, the current battery swapping system verification is a combination of finite element analysis and testing, but the deviation rate of these two methods is the key to the development of the battery swapping system. The current finite element analysis method for the reliability of the battery swapping system is not accurate enough, and the deviation rate of the test is large, which leads to a waste of test costs and affects the progress of product development.

[0048] In this specification, a simulation and analysis method for a battery swap system is provided. This specification also involves a simulation and analysis device for a battery swap system, a computing device, a computer-readable storage medium, and a computer program, which are described in detail one by one in the following embodiments.

[0049] Figure 1 A flowchart of a simulation analysis method for a battery replacement system provided according to an embodiment of the present specification is shown, which specifically includes the following steps.

[0050] Step 102: Establish a finite element analysis model of the battery swap system, and mesh the finite element analysis model to generate a meshing result, wherein the battery swap system includes a battery swap subsystem and a battery subsystem, the locking mechanism pressure head of the battery swap subsystem is connected to the pad of the battery subsystem, and the precision guide structure of the battery swap subsystem is connected to the battery subsystem.

[0051] Specifically, the embodiments of this specification perform finite element analysis on the battery replacement system of a new energy vehicle to achieve a flexible and accurate evaluation of the structural strength of the battery replacement system of the new energy vehicle.

[0052] The specific analysis process requires selecting appropriate engineering software to establish a finite element analysis model of the battery swap system. The model should include the geometric shape, material properties, etc. of the battery swap system, and then divide the geometric shape of the battery swap system into small units to construct a discrete grid. These small units constitute a model, which is used to approximate the complex shape of the battery swap system structure. The fineness of the grid directly affects the accuracy of the analysis, but it will also increase the complexity and cost of the calculation. Larger grid elements may reduce the complexity of the calculation, but may sacrifice accuracy. Therefore, in order to ensure the accuracy of the analysis, it is necessary to select an appropriate grid density to mesh the established finite element analysis model based on the grid density and generate a grid division result.

[0053] A schematic diagram of a battery replacement system provided in an embodiment of this specification is as follows Figure 2a As shown, Figure 2a In the embodiment, the battery replacement system includes a battery replacement subsystem and a battery subsystem. A schematic diagram of a battery replacement subsystem provided in one embodiment of the present specification is as follows: Figure 2b As shown, a schematic diagram of a battery subsystem provided in one embodiment of this specification is as follows Figure 2c As shown, the locking mechanism pressure head of the electric power subsystem is connected to the pad of the battery subsystem, and the precision guide structure of the electric power subsystem is connected to the battery subsystem (not shown in the figure).

[0054] It should be noted that Figure 2a , Figure 2b as well as Figure 2c It is only used to schematically describe the structure of the sub-switch system and the battery sub-system and the positional relationship between the two, and is not used to limit the specific structure of the sub-switch system and the battery sub-system and the connection relationship and connection method between the two.

[0055] In an optional implementation, before establishing the finite element analysis model of the battery replacement system, the method further includes:

[0056] Determine the unit system corresponding to the finite element model, and determine the unit type and unit quality requirements of each unit in the finite element model, wherein the thin-walled part structure in the battery replacement system is modeled by shell units, the adhesive and weld are modeled by solid units, and the hinge pin structure is modeled by beam units and rigid body units;

[0057] Accordingly, the establishment of a finite element analysis model of the battery replacement system includes:

[0058] A finite element analysis model of the battery replacement system is established based on the unit system, the unit type and the unit quality requirements.

[0059] Specifically, before establishing the model, the unit system used in the finite element analysis model and the unit type required for simulating each part of the model should be clarified. Generally, when the thickness of the structure is much smaller than the length of the structure, it is recommended to use shell units to simulate thin-walled parts; glue, hinges, etc. are simulated with solid units; hinge pins, etc. are simulated with beam units and RBE2 units. In addition, when dividing thin-walled parts with shell units, try to use quadrilateral units to reduce the number of triangular units. In addition to structural restrictions, triangular unit concentration should be avoided; the unit mesh of each thin-walled part should be located on the mid-surface of the part; the units of each part should be continuous to ensure that their free edges only appear on the actual boundaries of the part; the normal direction of the units of the same part must be consistent; grid angles greater than 180 degrees or negative values, negative accord ratios, and repeated units are not allowed.

[0060] In terms of unit quality requirements, for 1D (one-dimensional) units, mass point units MASS, RBE2 and RBE3 for connection, CBAR (beam unit) and CBUSH (spring unit) are usually used. 1D units must ensure that there are no free nodes; when using 1D units for modeling, the model can be checked to ensure that there are no 1D units such as free 1-d's, rigid loops, dependency, duplicated, etc.

[0061] For 2D (two-dimensional) elements, the parameters of the components composed of shell elements are usually as shown in Table 1. The specific requirements need to be determined in the early stage of modeling based on the analysis type and requirements.

[0062] Table 1 Basic requirements for shell elements

[0063]

[0064] For 3D (three-dimensional) units, 3D units include hexahedron and tetrahedron units, which are mainly used for modeling hinges and adhesives on the body. Try to use eight-node six-face cube units. The cross-sectional direction of the part should be divided into at least three layers of units. During the modeling process, pay attention to checking duplication, connectivity, free edges and other requirements.

[0065] Step 104: Determine the loading conditions corresponding to the simulation analysis of the finite element analysis model, wherein the loading conditions include constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constraining the X- and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem.

[0066] Specifically, before conducting finite element analysis, it is necessary to clearly define the loading conditions and define appropriate loading conditions, such as aerodynamic loads, gravity, vibration, wind loads, etc. These conditions should simulate the working conditions of the battery swap system in actual use. At the same time, define boundary conditions and the way to apply boundary conditions to simulate the stress conditions of the battery swap system; then use the divided grid, consider the loading conditions and boundary conditions, and perform finite element analysis on the new energy vehicle battery swap system to simulate the behavior of the battery swap system under various working conditions to obtain finite element analysis results, and then extract relevant information from the obtained finite element analysis results to evaluate the structural strength of the new energy vehicle battery swap system, such as the stress, strain, displacement, etc. of the battery swap system under different working conditions.

[0067] The embodiments of this specification provide a more flexible and comprehensive performance evaluation of the structural strength of the new energy vehicle battery replacement system, which can simulate a variety of conditions and reduce the number of experiments. At the same time, it can effectively improve efficiency, reduce costs and accelerate product development.

[0068] The embodiment of this specification completes the establishment of the finite element analysis model of the battery subsystem and the electronic switching system through the above process, and the connection point between the locking mechanism pressure head of the electronic switching system and the battery subsystem pad only constrains the Z-direction degree of freedom, and the vibration X and Y-direction degrees of freedom between the pressure head and the pad are not completely locked. The existing constraint method is to make a fully constrained rigid connection between the pressure head and the pad.

[0069] In addition, the electronic switching system and the battery subsystem can also be connected through a precision guide structure, and the embodiments of this specification only constrain the X and Y degrees of freedom of the connection point between the precision guide structure and the battery subsystem, and the vibration Z degree of freedom between the precision guide structure and the battery subsystem is not completely locked. The X and Y degrees of freedom of the battery subsystem are mainly reflected in the precision guide structure and the locking mechanism pressure head of the electronic switching system. The precision guide structure and the locking mechanism pressure head jointly constrain the six degrees of freedom of the battery subsystem. However, the existing solutions do not require the connection between the precision guide structure and the battery subsystem, and the six degrees of freedom are reflected in the full constraint of the pressure head and the pad.

[0070] In an optional embodiment, the pad includes a rubber pad, and the locking mechanism pressure head is rigidly connected to the shock absorbing and damping structure including the rubber pad in the battery subsystem;

[0071] Correspondingly, the loading condition also includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the shock absorbing and damping structure.

[0072] Specifically, there is a shock-absorbing and damping structure containing rubber pads between the lower bottom frame of the battery subsystem and the upper bottom frame of the electronic exchange system. In the embodiment of this specification, the lower bottom frame of the battery subsystem and the upper bottom frame of the electronic exchange system are connected by a tie (rigid) connection through the shock-absorbing and damping structure, and the freedom is only constrained in the Z direction, and the freedom in the X and Y directions is released to simulate the interference fit of the pressure head pressing down. The existing scheme is to make a tie (rigid) fully constrained connection between the lower bottom frame of the battery subsystem and the upper bottom frame of the electronic exchange system, or to constrain the freedom in the Z direction of the upper bottom frame and the lower bottom frame limit blocks, and the shock-absorbing and damping structure containing rubber pads and the upper bottom frame are not connected. This will cause the rigidity between the bottom frames to be too large. This problem can be reduced or avoided through the processing method of the embodiment of this specification.

[0073] In another optional embodiment, the subsystem for exchanging electric energy is connected to the battery subsystem via a plurality of fixing points, each of which is a rigid unit;

[0074] Correspondingly, the loading conditions also include constraining the X, Y, and Z degrees of freedom of each fixed point.

[0075] Specifically, the battery subsystem and the sub-system can be connected through the aforementioned structure as well as through fixed points, and each fixed point is a rigid unit (RBE2).

[0076] In practical applications, the fixed point can be realized by the weld. For the modeling of the weld, the nodes of the two parts at the weld can usually be aligned as much as possible, and then the nodes are connected by RBE2 units for simulation. In addition, in addition to the splicing connection method, there are two other methods: vertical and parallel welding. Usually, the material of the weld is the parent material, and the weld thickness is the thickness of the thinner part of the connected parts.

[0077] Usually, the simulation method of welds will select different unit types for simulation according to different calculation analysis types or solvers. There are two commonly used categories: one is the ACM unit type, which is suitable for analysis types such as structural stiffness, fatigue durability, and NVH; the other is 1D unit simulation, which is usually used for collision safety and other explicit calculation methods.

[0078] For ACM unit type simulation, the diameter of the weld is set according to the actual situation. Usually, the diameter of the body weld is D = 6mm. The weld material is the base material, which is usually uniformly set to ordinary steel, and the attribute is solid unit.

[0079] For 1D unit simulation, the solver usually uses 1D BEAM unit model welds. The BEAM unit properties are set according to the actual welds. Usually, the diameter of the body weld is D = 6mm. In addition, it is necessary to create weld contact to simulate the force transmission characteristics of the actual weld.

[0080] In addition, for the adhesive connection modeling method, the adhesive and the solder joint also use the ACM unit (solid+Rbe3) method. The glue coating length and the depth of the glue groove are usually reflected in the design and model, and the material properties of the solid unit are set according to the actual adhesive.

[0081] The embodiment of this specification completes the construction of the finite element model of the entire battery replacement system through the above process. After the construction is completed, the model quality check can also be performed. Specifically, after the modeling is completed, the overall model and mesh units can be generally checked in terms of confirming the integrity of the model input, mesh quality check (all mesh qualities must meet the mesh standard requirements), model quality check, connection relationship check, operating load loading and result output, etc., to ensure the accuracy of the modeling results.

[0082] Step 106: Based on the meshing result and according to the loading conditions, simulation analysis is performed on the finite element analysis model to generate corresponding simulation analysis results.

[0083] Specifically, after the finite element analysis model is established and meshed, the established finite element analysis model can be simulated and analyzed based on the meshing results and the determined loading conditions, and corresponding simulation analysis results can be generated.

[0084] The finite element analysis model is simulated and analyzed, specifically, the vibration fatigue condition analysis of the battery swap system is performed, which is mainly used to examine and evaluate the effect of road excitation on the battery swap system of the vehicle during driving, and whether structural strength damage occurs under fixed-frequency vibration conditions. The excitation points are the connection points in the previous steps and the center points of RBE2 corresponding to the fixed points. The excitation value is the standard vibration PSD acceleration spectrum. The PSD spectrum of each point and the root mean square value RMS of the system structure are calculated through statistical analysis methods.

[0085] In an optional implementation, performing simulation analysis on the finite element analysis model according to the loading condition to generate corresponding simulation analysis results includes:

[0086] The finite element analysis model is simulated and analyzed by the Lanczos method according to the loading conditions to obtain the modal vibration shapes of the battery replacement system in the X, Y, and Z directions.

[0087] Specifically, as mentioned above, after the finite element analysis model is established and the model is meshed, the established finite element analysis model can be simulated and analyzed based on the meshing results and the determined loading conditions. The embodiment of this specification calculates the modal vibration shape of the entire battery swap system in the X, Y, and Z directions by the Lanczos method, and obtains the PSD spectrum of each connection point and each fixed point in the X, Y, and Z directions. The mode of the battery swap system and the monitored PSD acceleration can be seen in the spectrum.

[0088] Step 108: Perform reliability analysis on the battery replacement system according to the simulation analysis results, and generate corresponding reliability analysis results.

[0089] Specifically, after the simulation is completed and the corresponding simulation results are obtained, the reliability analysis of the battery swap system can be performed based on the simulation results.

[0090] In practical applications, reliability analysis of the battery swap system may be performed, specifically, analysis of the structural strength of the battery swap system, that is, analysis of the structural strength of the connection points and fixing points of the battery swap subsystem and the battery subsystem, so as to determine the stress, strain, displacement, etc. of the battery swap system under different working conditions; or it may also be determined whether the fasteners of the battery swap system will become loose, deformed, broken, loose, etc. when the battery swap system is working under different working conditions.

[0091] By comparing the reliability analysis results obtained by the embodiments of this specification with the historical analysis results, and according to the comparison results, it can be determined that the finite element analysis model is simulated and analyzed according to the loading conditions determined by the embodiments of this specification, the deviation rate of the modal main vibration mode frequency and the test can be greatly reduced. Among them, the deviation rate of the X-direction main vibration mode is reduced from 33.46% to 1.65%; the deviation rate of the Y-direction main vibration mode is reduced from 44.38% to 1.21%; the deviation rate of the Z-direction main vibration mode is reduced from 19.75% to 0.92%. The deviation rate of the acceleration in three directions of the vibration monitoring point (fixed point and connection point) and the test is also greatly reduced, the deviation rate of the X-direction vibration acceleration is reduced from 18.87% to 0.91%; the deviation rate of the Y-direction vibration acceleration is reduced from 22.57% to 0.97%; the deviation rate of the Z-direction vibration acceleration is reduced from 22.37% to 0.61%.

[0092] In an optional implementation, the simulation analysis method of the battery replacement system further includes:

[0093] Determine whether the battery replacement system meets the preset reliability conditions according to the reliability analysis result;

[0094] If so, the structure of the target battery replacement system is adjusted according to the finite element analysis model.

[0095] Specifically, after obtaining the corresponding reliability analysis results, it is also possible to determine based on the reliability analysis results whether the structure of the actual battery swap battery system (target battery swap battery system) can be adjusted based on the connection relationship between the battery swap subsystem and the battery subsystem simulated in the finite element analysis model and the constraints of each connection point and fixed point.

[0096] For example, the preset reliability condition may be that the deviation rate of the main vibration modes in the X, Y, and Z directions is less than a preset main vibration mode deviation rate threshold, and the deviation rate of the vibration acceleration in the X, Y, and Z directions is less than or equal to a preset acceleration deviation rate threshold. When it is determined according to the reliability analysis results that the deviation rate of the main vibration modes in the X, Y, and Z directions and the deviation rate of the vibration acceleration in the X, Y, and Z directions of the battery swap system meet the preset reliability condition, the structure of the actual battery swap system (target battery swap system) may be adjusted according to the connection relationship between the battery swap subsystem and the battery subsystem simulated in the finite element analysis model and the constraints of each connection point and fixed point.

[0097] A simulation analysis method for a battery replacement system provided in an embodiment of the present specification is to establish a finite element analysis model of the battery replacement system, and to mesh the finite element analysis model to generate a meshing result, wherein the battery replacement system includes a battery replacement subsystem and a battery subsystem, the locking mechanism pressure head of the battery replacement subsystem is connected to the pad of the battery subsystem, and the precision guide structure of the battery replacement subsystem is connected to the battery subsystem; determine the loading conditions corresponding to the simulation analysis of the finite element analysis model, wherein the loading conditions include constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constraining the X and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem; based on the meshing result, and according to the loading conditions, the finite element analysis model is simulated and analyzed to generate the corresponding simulation analysis results; according to the simulation analysis results, the reliability analysis of the battery replacement system is performed to generate the corresponding reliability analysis results. When the embodiment of the present specification performs simulation analysis on the battery replacement system, the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad is constrained, and the X and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem are constrained. The simulation analysis performed in this constraint manner is conducive to ensuring the accuracy of the analysis results.

[0098] The following combination Figure 3 Taking the application of the simulation analysis method of the battery replacement system provided in this specification in actual scenarios as an example, the simulation analysis method of the battery replacement system is further explained. Figure 3 A processing flow chart of a simulation analysis method for a battery replacement system provided in an embodiment of the present specification is shown, which specifically includes the following steps.

[0099] Step 302: Determine the unit system corresponding to the finite element model, and determine the unit type and unit quality requirements of each unit in the finite element model.

[0100] Specifically, the thin-walled parts in the system are modeled using shell elements; the adhesive and welds are modeled using solid elements; and the hinge pin structure is modeled using beam elements and rigid body elements.

[0101] Step 304: Establish a finite element analysis model of the battery replacement system based on the unit system, unit type, and unit quality requirements.

[0102] Specifically, the battery swap system includes a battery swap subsystem and a battery subsystem, and the locking mechanism pressure head of the battery swap subsystem is connected to the pad of the battery subsystem.

[0103] In addition, the pad includes a rubber pad, and the locking mechanism pressure head is rigidly connected to the shock-absorbing and damping structure including the rubber pad in the battery subsystem.

[0104] Step 306: Mesh the finite element analysis model of the battery swap system and generate mesh results.

[0105] Step 308: Determine the loading conditions corresponding to the simulation analysis of the finite element analysis model of the battery replacement system.

[0106] Specifically, the loading condition includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the cushion block.

[0107] In addition, the precision guide structure of the switching subsystem is connected to the switching subsystem; therefore, the loading condition also includes constraining the X and Y degrees of freedom of the connection point between the precision guide structure and the switching subsystem.

[0108] In addition, the electric subsystem and the battery subsystem are connected through multiple fixed points, each of which is a rigid unit; therefore, the loading conditions also include constraining the X, Y, and Z degrees of freedom of each fixed point.

[0109] Step 310: Perform simulation analysis on the finite element analysis model of the battery swap system using the Lanczos method and according to loading conditions to obtain the modal vibration shapes of the battery swap system in the X, Y, and Z directions.

[0110] Step 312: Perform reliability analysis on the battery replacement system based on the simulation analysis results and generate corresponding reliability analysis results.

[0111] Step 314: When it is determined that the battery swap system meets the preset reliability conditions based on the reliability analysis results, the structure of the target battery swap system is adjusted according to the finite element analysis model of the battery swap system.

[0112] When performing simulation analysis on the battery replacement system, the embodiments of this specification constrain the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constrain the X- and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem. Performing simulation analysis in this constrained manner is beneficial to ensuring the accuracy of the analysis results.

[0113] Corresponding to the above method embodiment, this specification also provides a simulation analysis device embodiment of a battery replacement system, Figure 4 FIG. 1 is a schematic diagram showing a structure of a simulation analysis device for a battery replacement system provided by an embodiment of the present specification. Figure 4 As shown, the device comprises:

[0114] Establishing module 402, configured to establish a finite element analysis model of a battery-swap system, and mesh the finite element analysis model to generate a meshing result, wherein the battery-swap system includes a battery-swap subsystem and a battery subsystem, a locking mechanism pressure head of the battery-swap subsystem is connected to a pad of the battery subsystem, and a precision guide structure of the battery-swap subsystem is connected to the battery subsystem;

[0115] A determination module 404 is configured to determine a loading condition corresponding to the simulation analysis of the finite element analysis model, wherein the loading condition includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constraining the X-direction and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem;

[0116] A simulation module 406 is configured to perform simulation analysis on the finite element analysis model based on the meshing result and according to the loading condition, and generate corresponding simulation analysis results;

[0117] The analysis module 408 is configured to perform reliability analysis on the battery replacement system according to the simulation analysis results and generate corresponding reliability analysis results.

[0118] Optionally, the pad includes a rubber pad, and the locking mechanism pressure head is rigidly connected to a shock absorbing and damping structure in the battery subsystem that includes the rubber pad;

[0119] Correspondingly, the loading condition also includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the shock absorbing and damping structure.

[0120] Optionally, the subsystem for exchanging electric energy is connected to the battery subsystem via a plurality of fixing points, each of which is a rigid unit;

[0121] Correspondingly, the loading conditions also include constraining the X, Y, and Z degrees of freedom of each fixed point.

[0122] Optionally, the simulation module 406 is further configured to:

[0123] The finite element analysis model is simulated and analyzed by the Lanczos method according to the loading conditions to obtain the modal vibration shapes of the battery replacement system in the X, Y, and Z directions.

[0124] Optionally, the simulation analysis device for the battery replacement system further includes a processing module 410 configured to:

[0125] Determine the unit system corresponding to the finite element model, and determine the unit type and unit quality requirements of each unit in the finite element model, wherein the thin-walled part structure in the battery replacement system is modeled by shell units, the adhesive and weld are modeled by solid units, and the hinge pin structure is modeled by beam units and rigid body units;

[0126] Accordingly, the establishing module 402 is further configured to:

[0127] A finite element analysis model of the battery replacement system is established based on the unit system, the unit type and the unit quality requirements.

[0128] Optionally, the simulation analysis device for the battery replacement system further includes an adjustment module 412, which is configured to:

[0129] Determine whether the battery replacement system meets the preset reliability conditions according to the reliability analysis result;

[0130] If so, the structure of the target battery replacement system is adjusted according to the finite element analysis model.

[0131] The above is a schematic scheme of a simulation analysis device for a battery swap system of this embodiment. It should be noted that the technical scheme of the simulation analysis device for the battery swap system and the technical scheme of the simulation analysis method for the battery swap system belong to the same concept. For details not described in detail in the technical scheme of the simulation analysis device for the battery swap system, please refer to the description of the technical scheme of the simulation analysis method for the battery swap system.

[0132] Figure 5 The structure block diagram of a computing device 500 provided according to an embodiment of the present specification is shown. The components of the computing device 500 include but are not limited to a memory 510 and a processor 520. The processor 520 is connected to the memory 510 via a bus 530, and the database 550 is used to store data.

[0133] The computing device 500 also includes an access device 540 that enables the computing device 500 to communicate via one or more networks 560. Examples of these networks include a public switched telephone network (PSTN), a local area network (LAN), a wide area network (WAN), a personal area network (PAN), or a combination of communication networks such as the Internet. The access device 540 may include one or more of any type of network interface (e.g., a network interface card (NIC)) whether wired or wireless, such as an IEEE 802.11 wireless local area network (WLAN) wireless interface, a World Wide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a universal serial bus (USB) interface, a cellular network interface, a Bluetooth interface, a near field communication (NFC) interface, and the like.

[0134] In one embodiment of the present specification, the above components of the computing device 500 and Figure 5 Other components not shown in the figure may also be connected to each other, for example, via a bus. It should be understood that Figure 5 The computing device structure block diagram shown is only for the purpose of illustration, and is not intended to limit the scope of this specification. Those skilled in the art can add or replace other components as needed.

[0135] The computing device 500 may be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., a tablet computer, a personal digital assistant, a laptop computer, a notebook computer, a netbook, etc.), a mobile phone (e.g., a smart phone), a wearable computing device (e.g., a smart watch, smart glasses, etc.), or other types of mobile devices, or a stationary computing device such as a desktop computer or PC. The computing device 500 may also be a mobile or stationary server.

[0136] Among them, the processor 520 is used to execute the following computer-executable instructions, which, when executed by the processor, implement the steps of the simulation analysis method of the above-mentioned battery replacement system.

[0137] The above is a schematic scheme of a computing device of this embodiment. It should be noted that the technical scheme of the computing device and the technical scheme of the simulation analysis method of the battery replacement system mentioned above belong to the same concept. For details not described in detail in the technical scheme of the computing device, please refer to the description of the technical scheme of the simulation analysis method of the battery replacement system mentioned above.

[0138] An embodiment of the present specification also provides a computer-readable storage medium, which stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the steps of the simulation analysis method of the above-mentioned battery replacement system are implemented.

[0139] The above is a schematic scheme of a computer-readable storage medium of this embodiment. It should be noted that the technical scheme of the storage medium and the technical scheme of the simulation analysis method of the battery replacement system mentioned above belong to the same concept. For details not described in detail in the technical scheme of the storage medium, please refer to the description of the technical scheme of the simulation analysis method of the battery replacement system mentioned above.

[0140] An embodiment of the present specification also provides a computer program, wherein when the computer program is executed in a computer, the computer is instructed to execute the steps of the simulation analysis method of the battery replacement system.

[0141] The above is a schematic scheme of a computer program of this embodiment. It should be noted that the technical scheme of the computer program and the technical scheme of the simulation analysis method of the battery replacement system mentioned above belong to the same concept. For details not described in detail in the technical scheme of the computer program, please refer to the description of the technical scheme of the simulation analysis method of the battery replacement system mentioned above.

[0142] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0143] The computer instructions include computer program codes, which may be in source code form, object code form, executable files or some intermediate forms, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0144] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of this specification are not limited by the order of the actions described, because according to the embodiments of this specification, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of this specification.

[0145] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0146] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A simulation analysis method for a battery replacement system, comprising: Establishing a finite element analysis model of a battery-swap system, and meshing the finite element analysis model to generate a meshing result, wherein the battery-swap system includes a battery-swap subsystem and a battery subsystem, the locking mechanism pressure head of the battery-swap subsystem is connected to the pad of the battery subsystem, and the precision guide structure of the battery-swap subsystem is connected to the battery subsystem; Determining a loading condition corresponding to a simulation analysis of the finite element analysis model, wherein the loading condition includes constraining the Z-direction degree of freedom of a connection point between the locking mechanism pressure head and the pad, and constraining the X-direction and Y-direction degrees of freedom of a connection point between the precision guide structure and the battery subsystem; Based on the meshing result and according to the loading condition, the finite element analysis model is simulated and analyzed to generate corresponding simulation analysis results; Perform reliability analysis on the battery replacement system based on the simulation analysis results to generate corresponding reliability analysis results.

2. According to the simulation analysis method of the battery replacement system of claim 1, the pad includes a rubber pad, and the locking mechanism pressure head is rigidly connected to the shock absorbing and damping structure including the rubber pad in the battery subsystem; Correspondingly, the loading condition also includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the shock absorbing and damping structure.

3. According to the simulation analysis method of the battery replacement system of claim 1, the battery replacement subsystem is connected to the battery subsystem through multiple fixed points, and each fixed point is a rigid unit; Correspondingly, the loading conditions also include constraining the X, Y, and Z degrees of freedom of each fixed point.

4. According to the simulation analysis method of the battery replacement system of claim 1, the finite element analysis model is simulated and analyzed according to the loading conditions to generate corresponding simulation analysis results, including: The finite element analysis model is simulated and analyzed by the Lanczos method according to the loading conditions to obtain the modal vibration shapes of the battery replacement system in the X, Y, and Z directions.

5. The simulation analysis method of the battery replacement system according to claim 1, before establishing the finite element analysis model of the battery replacement system, further comprising: Determine the unit system corresponding to the finite element model, and determine the unit type and unit quality requirements of each unit in the finite element model, wherein the thin-walled part structure in the battery replacement system is modeled by shell units, the adhesive and weld are modeled by solid units, and the hinge pin structure is modeled by beam units and rigid body units; Accordingly, the establishment of a finite element analysis model of the battery replacement system includes: A finite element analysis model of the battery replacement system is established based on the unit system, the unit type and the unit quality requirements.

6. The simulation analysis method of the battery replacement system according to claim 1, further comprising: Determine whether the battery replacement system meets the preset reliability conditions according to the reliability analysis result; If so, the structure of the target battery replacement system is adjusted according to the finite element analysis model.

7. A simulation analysis device for a battery replacement system, comprising: An establishing module is configured to establish a finite element analysis model of a battery-swap system, and mesh the finite element analysis model to generate a meshing result, wherein the battery-swap system includes a battery-swap subsystem and a battery subsystem, a locking mechanism pressure head of the battery-swap subsystem is connected to a pad of the battery subsystem, and a precision guide structure of the battery-swap subsystem is connected to the battery subsystem; a determination module configured to determine a loading condition corresponding to the simulation analysis of the finite element analysis model, wherein the loading condition includes constraining the Z-direction degree of freedom of the connection point between the locking mechanism pressure head and the pad, and constraining the X-direction and Y-direction degrees of freedom of the connection point between the precision guide structure and the battery subsystem; A simulation module, configured to perform simulation analysis on the finite element analysis model based on the meshing result and according to the loading condition, and generate corresponding simulation analysis results; The analysis module is configured to perform reliability analysis on the battery replacement system according to the simulation analysis results and generate corresponding reliability analysis results.

8. A computing device comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the simulation analysis method of the battery replacement system described in any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the simulation analysis method for a battery replacement system as described in any one of claims 1 to 6.

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