Simulation method and device for misuse working condition of power battery bottom

Abstract

This application relates to a simulation method and apparatus for simulating the misuse condition of the bottom of a power battery. The method includes: simulating the dynamic process of the bottom of the power battery being impacted based on a preset refined mesh model of the power battery and a preset simulation model of the misuse condition of the power battery under the vehicle; determining whether the initial simulation results of the misuse condition of the power battery under the vehicle meet preset performance requirements; in response to the initial simulation results meeting the preset performance requirements, comparing the initial simulation results with the actual vehicle test results, and in response to the discrepancy between the initial simulation results and the actual vehicle test results, correcting the parameters in the simulation model, and determining the final simulation result of the misuse condition of the power battery under the vehicle based on the corrected model. This application identifies vehicle and power battery risks in advance through simulation analysis, reinforces and optimizes weak areas, and reduces the risk of damage to vehicles and personnel caused by this condition in actual accident scenarios.

Description

Technical Field

[0001] This application relates to the field of power battery simulation technology, and in particular to a simulation method and apparatus for simulating the misuse of the bottom of a power battery. Background Technology

[0002] Currently, the new energy vehicle industry is developing rapidly, with the number of vehicles on the road both domestically and internationally continuing to rise. As a core component of new energy vehicles, the safety performance of the power battery directly affects the overall vehicle safety. Therefore, safety assessment of the misuse of the power battery bottom has become an important part of the collision safety evaluation of new energy vehicles. Various collision safety evaluation systems have gradually added assessment requirements for the misuse of the power battery bottom. Existing assessment and simulation conditions mainly include two types: fixed obstacle avoidance bottom scraping and bottom ball impact, which are used to simulate scenarios where the vehicle runs over a fixed protruding obstacle on the road and a small obstacle such as a stone bounces up and impacts the bottom of the battery, respectively.

[0003] In related technologies, corresponding simulation and evaluation methods have been developed for the above-mentioned misuse of the bottom of the power battery. These methods include: a fixed obstacle avoidance system with a certain amount of overlap with the battery in the Z direction; a vehicle traveling horizontally or tilted at a certain angle forward or backward at a certain speed; and passing over the fixed obstacle to assess the damage to the battery (simulating the vehicle running over a fixed protruding obstacle on the road while driving); and a fixed-size sphere impacting the bottom of the battery with a certain amount of energy to assess the damage to the battery (simulating the vehicle running over a stone or other obstacle while driving, which bounces up and lands on the battery at the bottom of the vehicle).

[0004] However, the relevant technologies cannot cover the actual accident scenario where a vehicle runs over a paving stone while driving, and the paving stone lifts up and hits the front end of the power battery. This can easily lead to higher safety hazards in actual use of the vehicle. At the same time, due to the lack of risk identification in the design stage, the pass rate of actual vehicle tests is low, the product development cycle is extended, and the cost of testing and prototypes is increased. These issues urgently need to be addressed. Summary of the Invention

[0005] This application provides a simulation method and device for the misuse of the bottom of a power battery, in order to solve the problem that related technologies cannot cover the actual accident scenario where a vehicle runs over a paving stone and the paving stone lifts up and hits the front end of the power battery. This can easily lead to high safety hazards in actual use of the vehicle. At the same time, due to the lack of risk identification in the design stage, it can also cause problems such as low pass rate of actual vehicle tests, extended product development cycle, and increased testing and prototype costs.

[0006] The first aspect of this application provides a simulation method for a power battery bottom misuse condition, comprising the following steps: simulating the dynamic process of the power battery bottom being impacted based on a preset refined mesh model of the power battery and a preset simulation model of the power battery bottom misuse condition of the vehicle, to generate an initial simulation result of the power battery bottom misuse condition; determining whether the initial simulation result of the power battery bottom misuse condition of the vehicle meets preset performance requirements; in response to the initial simulation result meeting the preset performance requirements, comparing the initial simulation result with the actual vehicle test result, and in response to the difference between the initial simulation result and the actual vehicle test result, correcting the parameters in the simulation model, so as to determine the final simulation result of the power battery bottom misuse condition of the vehicle based on the corrected model.

[0007] Optionally, in one embodiment of this application, before simulating the dynamic process of the bottom of the power battery being impacted based on a preset refined grid model of the power battery and a preset simulation model of the power battery under misuse conditions of the vehicle bottom, the method further includes: dividing the power battery frame, cells, liquid cooling plate and bottom guard plate into grids to establish the preset refined grid model of the power battery.

[0008] Optionally, in one embodiment of this application, before simulating the dynamic process of the bottom of the power battery being impacted based on a preset refined grid model of the power battery and a preset simulation model of the power battery under misuse conditions of the vehicle bottom, the method further includes: establishing a vehicle model, a brick model, a ground model, and a dent model; and establishing the preset simulation model of the power battery under misuse conditions of the vehicle bottom based on the vehicle model, the brick model, the ground model, and the dent model.

[0009] Optionally, in one embodiment of this application, before simulating the dynamic process of the bottom of the power battery being impacted, the method further includes: controlling the vehicle model to drive towards the pit model at a preset speed, so that when the vehicle's wheels press on the brick model, and the front end of the brick model slides into the pit model and hits the fixed baffle to stop moving, the rear end of the brick model tilts upward and contacts the bottom of the power battery, thereby generating the dynamic process of the bottom of the power battery being impacted.

[0010] Optionally, in one embodiment of this application, the simulation of the dynamic process of the bottom of the power battery being impacted to generate initial simulation results of the power battery bottom misuse condition includes: simulating the dynamic process of the bottom of the power battery being impacted to generate the strain of the power battery frame and bottom protection plate, the deformation of the battery cell, and the deformation and strain of the liquid cooling plate; based on the strain of the power battery frame and the bottom protection plate, evaluating whether the sealing performance of the power battery frame and the bottom protection plate meets preset normal conditions to generate a first evaluation result; based on the deformation of the battery cell, evaluating whether the battery cell meets preset thermal runaway risk conditions to generate a second evaluation result; based on the deformation and strain of the liquid cooling plate, evaluating whether the liquid cooling plate meets preset leakage conditions to generate a third evaluation result; and based on the first evaluation result, the second evaluation result, and the third evaluation result, generating initial simulation results of the power battery bottom misuse condition.

[0011] Optionally, in one embodiment of this application, the step of correcting the parameters in the simulation model in response to a difference between the initial simulation result and the actual vehicle test result, so as to determine the final simulation result of the power battery under-vehicle misuse condition based on the corrected model, includes: detecting whether the initial simulation result and the actual vehicle test result meet the preset consistency condition; if the similarity between the flipping angle and the lifting height of the brick model in the initial simulation result and the actual vehicle test result is greater than or equal to a preset threshold, then it is determined that the initial simulation result and the actual vehicle test result meet the preset consistency condition, and the current simulation model is determined as the final model to generate the final simulation result of the power battery under-vehicle misuse condition; otherwise, it is determined that there is a difference between the initial simulation result and the actual vehicle test result, and the friction coefficient between the brick model and the ground model and the material property curve parameters of the brick model are corrected until the simulation result of the corrected model meets the preset consistency condition, and the final simulation result of the power battery under-vehicle misuse condition is determined.

[0012] A second aspect of this application provides a simulation device for a power battery bottom misuse condition, comprising: an initial simulation module, used to simulate the dynamic process of the bottom of the power battery being impacted based on a preset refined grid model of the power battery and a preset simulation model of the power battery vehicle bottom misuse condition, to generate an initial simulation result of the power battery bottom misuse condition; a judgment module, used to determine whether the initial simulation result of the power battery vehicle bottom misuse condition meets preset performance requirements; and a final simulation module, used to compare the initial simulation result with the actual vehicle test result in response to the initial simulation result meeting the preset performance requirements, and to correct the parameters in the simulation model in response to the difference between the initial simulation result and the actual vehicle test result, so as to determine the final simulation result of the power battery vehicle bottom misuse condition based on the corrected model.

[0013] Optionally, in one embodiment of this application, it further includes: a partitioning module, used to partition the power battery frame, cells, liquid cooling plate and bottom guard plate into a grid before simulating the dynamic process of the power battery bottom being impacted based on a preset power battery fine grid model and a preset power battery vehicle bottom misuse condition simulation model, so as to establish the preset power battery fine grid model.

[0014] Optionally, in one embodiment of this application, it further includes: a modeling module, used to establish a vehicle model, a brick model, a ground model, and a dent model before simulating the dynamic process of the bottom of the power battery being impacted, based on a preset refined grid model of the power battery and a preset simulation model of the power battery under misuse conditions of the vehicle bottom; and a simulation model building module, used to establish the preset simulation model of the power battery under misuse conditions of the vehicle bottom based on the vehicle model, the brick model, the ground model, and the dent model.

[0015] Optionally, in one embodiment of this application, it further includes: a generation module, used to control the vehicle model to drive towards the pit model at a preset speed before simulating the dynamic process of the bottom of the power battery being impacted, so that when the vehicle's wheels press on the brick model, and the front end of the brick model slides into the pit model and hits the fixed baffle to stop moving, the rear end of the brick model tilts upward and contacts the bottom of the power battery, thereby generating the dynamic process of the bottom of the power battery being impacted.

[0016] Optionally, in one embodiment of this application, the initial simulation module includes: a simulation unit, used to simulate the dynamic process of the bottom of the power battery being impacted, to generate the strain of the power battery frame and bottom protection plate, the deformation of the battery cell, and the deformation and strain of the liquid cooling plate; a first evaluation unit, used to evaluate whether the sealing performance of the power battery frame and bottom protection plate meets preset normal conditions based on the strain of the power battery frame and bottom protection plate, to generate a first evaluation result; a second evaluation unit, used to evaluate whether the battery cell meets preset thermal runaway risk conditions based on the deformation of the battery cell, to generate a second evaluation result; a third evaluation unit, used to evaluate whether the liquid cooling plate meets preset leakage conditions based on the deformation and strain of the liquid cooling plate, to generate a third evaluation result; and an initial simulation result generation unit, used to generate an initial simulation result of the power battery bottom misuse condition based on the first evaluation result, the second evaluation result, and the third evaluation result.

[0017] Optionally, in one embodiment of this application, the final simulation module includes: a detection unit, used to detect whether the initial simulation result and the actual vehicle test result meet the preset consistency condition; and a determination unit, used to determine that the initial simulation result and the actual vehicle test result meet the preset consistency condition when the similarity between the flipping angle and the lifting height of the brick model in the initial simulation result and the actual vehicle test result is greater than or equal to a preset threshold, and to determine the current simulation model as the final model to generate the final simulation result of the power battery bottom misuse condition. Otherwise, the correction unit is used to determine that there is a difference between the initial simulation result and the actual vehicle test result, and to correct the friction coefficient between the brick model and the ground model and the material property curve parameters of the brick model until the simulation result of the corrected model and the actual vehicle test result meet the preset consistency condition, and then determine the final simulation result of the power battery bottom misuse condition.

[0018] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the simulation method for the misuse of the bottom of a power battery as described in the above embodiments.

[0019] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described simulation method for the misuse of the bottom of a power battery.

[0020] This application's embodiments can accurately simulate the scenario where a vehicle hits a brick and the brick lifts up. During the design phase, performance engineers can use this method to conduct simulation analysis and optimization, identify risks in advance, and implement appropriate protection for vulnerable areas of the vehicle. This ensures that related tests for misuse of the vehicle's undercarriage pass on the first attempt. Simultaneously, it avoids the risk of damage to the vehicle and occupants caused by the lifting of bricks or similar obstacles after the vehicle hits the brick in real-world scenarios. Furthermore, by identifying and optimizing risks in advance, tests can be passed on the first attempt, effectively reducing product development time, testing and prototype costs, and improving user safety. This solves the problem that related technologies cannot cover the actual accident scenario where a brick lifts up and impacts the front end of the power battery after a vehicle hits the ground, easily leading to high safety hazards in actual use. It also addresses issues such as low pass rates in real-world tests, extended product development cycles, and increased testing and prototype costs due to insufficient risk identification during the design phase.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating a simulation method for a power battery bottom misuse condition according to an embodiment of this application; Figure 2 This is a schematic diagram of a simulation model of a passenger vehicle power battery under a misuse condition according to an embodiment of this application; Figure 3 This is a schematic diagram of a simulation model of a passenger vehicle power battery under a misuse condition according to an embodiment of this application; Figure 4 This is a schematic diagram of a power battery simulation model according to an embodiment of this application; Figure 5 This is an overall flowchart of a simulation method for a power battery bottom misuse condition according to an embodiment of this application; Figure 6 This is a schematic diagram of a simulation device for a power battery bottom misuse condition according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0024] The following describes a simulation method and apparatus for simulating the misuse condition of the bottom of a power battery according to embodiments of this application, with reference to the accompanying drawings. Addressing the issue that the related technologies mentioned in the background cannot cover the actual accident scenario where a vehicle hits a paving stone and the paving stone lifts up, impacting the front end of the power battery, this easily leads to high safety hazards in actual vehicle use. Furthermore, the lack of risk identification during the design phase results in low pass rates in real-vehicle tests, extended product development cycles, and increased testing and prototype costs. This application provides a simulation method for simulating the misuse condition of the bottom of a power battery. This method can accurately simulate the situation where a vehicle hits a paving stone and the paving stone lifts up. During the design phase, performance engineers can conduct simulation analysis and optimization based on this method, identify risks in advance, and implement appropriate protection for vulnerable areas of the vehicle, ensuring that related tests for the misuse condition of the bottom of the vehicle pass on the first attempt. Simultaneously, it avoids the risk of damage to the vehicle and personnel caused by obstacles lifting up after a user hits a paving stone or similar obstacle in actual user scenarios. Furthermore, by identifying and optimizing risks in advance, the test can be passed on the first attempt, effectively reducing product development time, testing and prototype costs, and improving user safety. This solves the problem that related technologies cannot cover actual accident scenarios where a vehicle hits a paving stone while driving, causing the paving stone to lift up and hit the front of the power battery. This can easily lead to high safety hazards in actual use of the vehicle. At the same time, due to the lack of risk identification in the design stage, problems such as low pass rate of actual vehicle tests, extended product development cycle, and increased testing and prototype costs will also occur.

[0025] Specifically, Figure 1 This is a flowchart illustrating a simulation method for a power battery bottom misuse condition provided in an embodiment of this application.

[0026] like Figure 1 As shown, the simulation method for the misuse condition at the bottom of the power battery includes the following steps: In step S101, based on the preset refined mesh model of the power battery and the preset simulation model of the power battery under the vehicle bottom misuse condition, the dynamic process of the power battery bottom being impacted is simulated to generate the initial simulation results of the power battery bottom misuse condition.

[0027] In actual implementation, the embodiments of this application can be based on a preset refined grid model of the power battery and a preset simulation model of the power battery under the vehicle's bottom misuse condition, and submit to LS-DYNA software for calculation to simulate the dynamic process of the power battery bottom being impacted, so as to generate the initial simulation results of the power battery bottom misuse condition.

[0028] The embodiments of this application can accurately simulate the situation where a vehicle runs over a brick and the brick lifts up. The risk can be accurately identified in the product design stage, which makes it easier for performance engineers to identify problems in advance during the design stage, formulate effective optimization solutions, and ensure that the real vehicle test of the misuse condition at the bottom of the power battery vehicle passes on the first try. This can effectively reduce product development time, testing and prototype costs.

[0029] Optionally, in one embodiment of this application, before simulating the dynamic process of the bottom of the power battery being impacted based on a preset refined grid model of the power battery and a preset simulation model of the power battery under misuse conditions of the vehicle bottom, the method further includes: establishing a vehicle model, a brick model, a ground model, and a dent model; and establishing a preset simulation model of the power battery under misuse conditions of the vehicle bottom based on the vehicle model, the brick model, the ground model, and the dent model.

[0030] In actual implementation, such as Figure 2 As shown, the embodiments of this application can set the bottom misuse condition: establish a simulation model of the bottom misuse condition of the power battery vehicle based on the actual accident scenario, including vehicle model 1, brick model 2, ground model 3, and pit model 4.

[0031] Optionally, in one embodiment of this application, before simulating the dynamic process of the bottom of the power battery being impacted, the method further includes: controlling the vehicle model to drive towards the pit model at a preset speed, so that when the vehicle's wheels press on the brick model, and the front end of the brick model slides into the pit model and hits the fixed baffle to stop moving, the rear end of the brick model tilts upward and contacts the bottom of the power battery, thereby generating the dynamic process of the bottom of the power battery being impacted.

[0032] In actual implementation, such as Figure 2 As shown, in this embodiment of the application, the vehicle model 1 can be placed on the ground model 3. By applying a certain initial speed to the vehicle model 1, the vehicle model 1 can be made to travel horizontally on the ground model 3. When it travels to the position of the pit model 4, the wheel 5 presses on the brick 2, causing the front end of the brick 2 to enter the pit 4. The front end of the brick 2 hits the fixed baffle 6, and the front end of the brick 2 stops moving in the direction of the vehicle. At the same time, the rear end of the brick 2 lifts up. Then the vehicle model 1 drives out of the pit model 4, generating a dynamic process in which the bottom of the power battery is impacted.

[0033] In the case of misuse of the bottom of the power battery, the driving speed of the vehicle model 1 needs to be set based on the actual accident scenario of the user; the brick model 2 is placed on the edge of the pit 4, partly on the ground model 3 and partly suspended above the pit 4. The size and material of the brick model 2 are determined based on relevant standards and actual user scenarios; the length of the brick model 2 suspended above the pit 4 and the Z-direction depth of the pit 4 are selected as the boundary conditions for the simulation and test of the misuse of the bottom of the power battery vehicle, based on the actual road conditions and the analysis results of different vehicles.

[0034] This application's embodiment simulates a real-world user scenario. A brick is placed flat on the ground, with its front end suspended in the air. A fixed baffle is located in a recessed area below the suspended position (the fixed baffle prevents the brick from continuing to move forward after the front end is pressed into the recess by a vehicle wheel, simulating a situation in real-world road conditions where one end of the brick is pressed into a recess and held in place by the front brick or other structures). As the vehicle moves, the wheels press against the brick or other road surface structures (not limited to bricks; this application also applies to other road surface structures that may flip or lift when pressed by the wheels). The brick lifting simulates a scenario of misuse of the vehicle's underside by a real-world user. Through this simulation analysis, risks to the vehicle and power battery can be identified in advance, and weak areas can be reinforced and optimized, reducing the risk of damage to the vehicle and personnel in real-world accident scenarios.

[0035] Optionally, in one embodiment of this application, before simulating the dynamic process of the bottom of the power battery being impacted based on a preset refined grid model of the power battery and a preset simulation model of the power battery under misuse conditions of the vehicle bottom, the method further includes: dividing the power battery frame, cells, liquid cooling plate and bottom guard plate into grids to establish a preset refined grid model of the power battery.

[0036] Among them, such as Figure 3 As shown, this embodiment of the application can establish a refined mesh model of the power battery: a simulation model of the power battery frame 7, cell 8, liquid cooling plate 9, and other internal components of the power battery is established with a mesh size of 2mm. The power battery frame 7 is modeled using SHELL cells, the cell 8 casing is simulated using SHELL cells, and the internal structure is simulated using SOLID cells.

[0037] Optionally, in one embodiment of this application, the dynamic process of the bottom of the power battery being impacted is simulated to generate initial simulation results of the power battery bottom misuse condition, including: simulating the dynamic process of the bottom of the power battery being impacted to generate the strain of the power battery frame and bottom protection plate, the deformation of the battery cell, and the deformation and strain of the liquid cooling plate; based on the strain of the power battery frame and bottom protection plate, evaluating whether the sealing performance of the power battery frame and bottom protection plate meets preset normal conditions to generate a first evaluation result; based on the deformation of the battery cell, evaluating whether the battery cell meets preset thermal runaway risk conditions to generate a second evaluation result; based on the deformation and strain of the liquid cooling plate, evaluating whether the liquid cooling plate meets preset leakage conditions to generate a third evaluation result; and based on the first evaluation result, the second evaluation result, and the third evaluation result, generating the initial simulation results of the power battery bottom misuse condition.

[0038] In actual implementation, such as Figure 4 As shown, this embodiment of the application can simulate the dynamic process of the bottom of the power battery being impacted to generate the strain of the power battery frame 7 and bottom protection plate 10, the deformation of the cell 8, and the deformation and strain of the liquid cooling plate 9. Based on the strain of the power battery frame 7 and bottom protection plate 10, the sealing performance of the power battery frame 7 and bottom protection plate 10 is evaluated to determine whether it meets the preset normal conditions. If the strain is greater than the fracture strain of the material itself, it is determined that the sealing function of the power battery is abnormal, so as to generate the first evaluation result. Based on the deformation of the cell 8, the battery cell 8 is evaluated to determine whether it meets the preset thermal runaway risk conditions. If the deformation of cell 8 exceeds the allowable deformation, cell 8 is determined to have a risk of thermal runaway, thus generating a second evaluation result. Based on the deformation and strain of liquid cooling plate 9, it is evaluated whether liquid cooling plate 9 meets the preset leakage conditions. If the strain of liquid cooling plate 9 exceeds the allowable strain, liquid cooling plate 9 is determined to have a risk of leakage. If the deformation of liquid cooling plate 9 exceeds the allowable deformation, liquid cooling plate 9 is determined to have a risk of functional abnormality, thus generating a third evaluation result. Based on the first evaluation result, the second evaluation result, and the third evaluation result, the initial simulation result of the misuse condition at the bottom of the power battery is generated.

[0039] In step S102, it is determined whether the initial simulation results of the power battery vehicle misuse condition meet the preset performance requirements.

[0040] It is understood that the preset performance requirement conditions in the embodiments of this application can be the conditions under which the initial simulation results meet the performance requirements.

[0041] In actual implementation, the embodiments of this application can determine whether the initial simulation results of the power battery vehicle misuse condition meet the preset performance requirements, thereby providing support for subsequent evaluation.

[0042] In step S103, if the initial simulation results meet the preset performance requirements, the initial simulation results are compared with the actual vehicle test results. If there is a difference between the initial simulation results and the actual vehicle test results, the parameters in the simulation model are corrected so as to determine the final simulation results of the power battery vehicle bottom misuse condition based on the corrected model.

[0043] Specifically, in this application embodiment, if the initial simulation results meet the preset performance requirements, a real-vehicle test of the bottom misuse condition of the power battery vehicle can be conducted. The real-vehicle test further evaluates whether the vehicle meets the performance requirements under the bottom misuse condition. This application compares the initial simulation results with the real-vehicle test results, and corrects the parameters in the simulation model in response to differences between the initial simulation results and the real-vehicle test results. Based on the corrected model, the final simulation results of the bottom misuse condition of the power battery vehicle are determined, thereby improving the simulation process and standards, and guiding subsequent vehicle design. Figure 5 As shown.

[0044] The simulation analysis results of the embodiments of this application are highly accurate, and the simulation model is easy to modify. The types and sizes of obstacle avoidance can be adjusted according to actual accident scenarios. At the same time, the simulation model can be modified in a timely manner based on test results to improve simulation accuracy, effectively guide the development of subsequent vehicle models, reduce product development costs, and shorten product development cycles.

[0045] Optionally, in one embodiment of this application, in response to a difference between the initial simulation results and the actual vehicle test results, the parameters in the simulation model are corrected to determine the final simulation result of the power battery under the vehicle misuse condition based on the corrected model. This includes: detecting whether the initial simulation results and the actual vehicle test results meet a preset consistency condition; if the similarity between the flipping angle and the lifting height of the brick model in the initial simulation results and the actual vehicle test results is greater than or equal to a preset threshold, then it is determined that the initial simulation results and the actual vehicle test results meet the preset consistency condition, and the current simulation model is determined as the final model to generate the final simulation result of the power battery under the misuse condition; otherwise, it is determined that there is a difference between the initial simulation results and the actual vehicle test results, and the friction coefficient between the brick model and the ground model and the material property curve parameters of the brick model are corrected until the simulation result of the corrected model meets the preset consistency condition, and then the final simulation result of the power battery under the misuse condition is determined.

[0046] It is understood that the preset threshold in the embodiments of this application can be 90%.

[0047] In actual implementation, this application embodiment can detect whether the initial simulation results and the actual vehicle test results meet the preset consistency conditions. If the similarity between the flipping angle and the lifting height of the brick model in the initial simulation results and the actual vehicle test results is greater than or equal to 90%, then the initial simulation results are determined to be consistent with the actual vehicle test results, and the current simulation model is determined as the final model to generate the final simulation results of the power battery bottom misuse condition. Otherwise, if the similarity between the flipping angle and the lifting height of the brick model in the initial simulation results and the actual vehicle test results is less than 90%, then the initial simulation results are determined to be different from the actual vehicle test results. The friction coefficient between the brick model 2 and the ground model 4 and the material characteristic curve parameters of the brick model 2 are corrected to improve the similarity between the simulation and the test, until the simulation results of the corrected model are consistent with the actual vehicle test results, and the final simulation results of the power battery bottom misuse condition are determined.

[0048] In this application, when correcting the simulation model, if the similarity between the flipping angle and the lifting height of the square brick model 2 in the simulation and the experimental results is greater than or equal to 90%, then the simulation results are considered to be consistent with the experimental results.

[0049] This application further accurately simulates and evaluates whether there are safety risks to vehicles and power batteries under the condition of misuse of the bottom of the power battery. It can accurately simulate and evaluate the risks of misuse of the bottom of the power battery during the product design stage, which makes it easier for performance engineers to identify risks in advance during the project design stage and develop optimization solutions for the problems. It ensures that the real vehicle test of the power battery under the condition of misuse of the bottom of the vehicle passes on the first try, which can effectively reduce product development time, testing and prototype costs, while improving user safety.

[0050] The simulation method for the misuse of the bottom of the power battery proposed in this application can accurately simulate the situation where a vehicle runs over a brick and the brick lifts up. Performance engineers can conduct simulation analysis and optimization based on this method during the design phase, identify risks in advance, and implement corresponding protection for vulnerable areas of the vehicle. This ensures that the relevant tests for the misuse of the bottom of the vehicle pass on the first attempt. Simultaneously, it avoids the risk of damage to the vehicle and personnel caused by the lifting of bricks or similar obstacles after the vehicle runs over them in real-world scenarios. Furthermore, by identifying and optimizing risks in advance, the test can be passed on the first attempt, effectively reducing product development time, testing and prototype costs, and improving user safety. This solves the problem that related technologies cannot cover the actual accident scenario where a vehicle runs over a brick and the brick lifts up, impacting the front end of the power battery. This easily leads to high safety hazards in actual use of the vehicle, and also causes low pass rates in real-world tests, extended product development cycles, and increased testing and prototype costs due to the lack of risk identification during the design phase.

[0051] Next, referring to the accompanying drawings, a simulation device for the misuse of the bottom of a power battery according to an embodiment of this application is described.

[0052] Figure 6 This is a schematic diagram of the structure of a simulation device for the misuse of the bottom of a power battery according to an embodiment of this application.

[0053] like Figure 6 As shown, the simulation device 20 for the misuse of the bottom of the power battery includes: an initial simulation module 100, a judgment module 200, and a final simulation module 300.

[0054] Specifically, the initial simulation module 100 is used to simulate the dynamic process of the bottom of the power battery being impacted based on a preset refined mesh model of the power battery and a preset simulation model of the power battery under the vehicle misuse condition, so as to generate the initial simulation results of the power battery under the misuse condition.

[0055] The judgment module 200 is used to determine whether the initial simulation results of the power battery vehicle misuse condition meet the preset performance requirements.

[0056] The final simulation module 300 is used to compare the initial simulation results with the actual vehicle test results when the initial simulation results meet the preset performance requirements, and to correct the parameters in the simulation model when there are differences between the initial simulation results and the actual vehicle test results, so as to determine the final simulation results of the power battery vehicle bottom misuse condition based on the corrected model.

[0057] Optionally, in one embodiment of this application, the simulation device 20 for the misuse of the bottom of the power battery further includes a division module.

[0058] The meshing module is used to mesh the power battery frame, cells, liquid cooling plate and bottom guard plate before simulating the dynamic process of the power battery bottom being impacted, based on a preset refined mesh model of the power battery and a preset simulation model of the power battery under the vehicle misuse condition. This is done to establish a preset refined mesh model of the power battery.

[0059] Optionally, in one embodiment of this application, the simulation device 20 for the misuse of the bottom of the power battery further includes: a model building module and a simulation model building module.

[0060] The module is used to build a vehicle model, a brick model, a ground model, and a dent model before simulating the dynamic process of the bottom of the power battery being impacted, based on a preset refined mesh model of the power battery and a preset simulation model of the power battery under the vehicle's misuse conditions.

[0061] The simulation model building module is used to build a simulation model of the pre-set power battery vehicle bottom misuse conditions based on the whole vehicle model, brick model, ground model and pit model.

[0062] Optionally, in one embodiment of this application, the simulation device 20 for the misuse of the bottom of the power battery further includes a generation module.

[0063] The generation module is used to control the vehicle model to drive towards the pit model at a preset speed before simulating the dynamic process of the bottom of the power battery being impacted. When the vehicle's wheels run over the brick model and the front end of the brick model slides into the pit model and hits the fixed baffle to stop moving, the rear end of the brick model tilts upward and contacts the bottom of the power battery, thus generating the dynamic process of the bottom of the power battery being impacted.

[0064] Optionally, in one embodiment of this application, the initial simulation module 100 includes: a simulation unit, a first evaluation unit, a second evaluation unit, a third evaluation unit, and an initial simulation result generation unit.

[0065] The simulation unit is used to simulate the dynamic process of the bottom of the power battery being impacted, so as to generate the strain of the power battery frame and bottom protection plate, the deformation of the battery cell, and the deformation and strain of the liquid cooling plate.

[0066] The first evaluation unit is used to evaluate whether the sealing performance of the power battery frame and bottom protection plate meets the preset normal conditions based on the strain of the power battery frame and bottom protection plate, so as to generate the first evaluation result.

[0067] The second evaluation unit is used to evaluate whether the cell meets the preset thermal runaway risk conditions based on the cell deformation, so as to generate a second evaluation result.

[0068] The third evaluation unit is used to evaluate whether the liquid cooling plate meets the preset leakage conditions based on the deformation and strain of the liquid cooling plate, so as to generate the third evaluation result.

[0069] The initial simulation result generation unit is used to generate initial simulation results of the power battery bottom misuse condition based on the first evaluation result, the second evaluation result, and the third evaluation result.

[0070] Optionally, in one embodiment of this application, the final simulation module 300 includes: a detection unit, a determination unit, and a correction unit.

[0071] The detection unit is used to detect whether the initial simulation results and the actual vehicle test results meet the preset consistency conditions.

[0072] The determination unit is used to determine whether the initial simulation results and the actual vehicle test results meet the preset consistency conditions when the similarity between the flipping angle and the lifting height of the brick model in the initial simulation results is greater than or equal to a preset threshold. The current simulation model is then determined as the final model to generate the final simulation results of the power battery bottom misuse condition.

[0073] Otherwise, the correction unit is used to determine the difference between the initial simulation results and the actual vehicle test results, correct the friction coefficient between the brick model and the ground model and the material property curve parameters of the brick model, until the simulation results of the corrected model and the actual vehicle test results meet the preset consistency conditions, and then determine the final simulation results of the power battery bottom misuse condition.

[0074] It should be noted that the explanation of the above-mentioned simulation method embodiment for the misuse condition of the bottom of the power battery also applies to the simulation device for the misuse condition of the bottom of the power battery in this embodiment, and will not be repeated here.

[0075] The simulation device for the misuse of the bottom of the power battery proposed in this application can accurately simulate the situation where a vehicle runs over a brick and the brick lifts up. During the design phase, performance engineers can conduct simulation analysis and optimization based on this method, identify risks in advance, and implement corresponding protection for vulnerable areas of the vehicle. This ensures that the relevant tests for the misuse of the bottom of the vehicle pass on the first attempt. Simultaneously, it avoids the risk of damage to the vehicle and personnel caused by the lifting of bricks or similar obstacles after the vehicle runs over them in actual user scenarios. Furthermore, by identifying and optimizing risks in advance, the test can be passed on the first attempt, effectively reducing product development time, testing and prototype costs, and improving user safety. This solves the problem that related technologies cannot cover the actual accident scenario where a vehicle runs over a brick and the brick lifts up, impacting the front end of the power battery. This easily leads to high safety hazards in actual vehicle use, and also causes low pass rates in real-vehicle tests, extended product development cycles, and increased testing and prototype costs due to the lack of risk identification during the design phase.

[0076] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 701, the processor 702, and the computer program stored on the memory 701 and executable on the processor 702.

[0077] When the processor 702 executes the program, it implements the simulation method for the misuse of the bottom of the power battery provided in the above embodiments.

[0078] Furthermore, electronic devices also include: Communication interface 703 is used for communication between memory 701 and processor 702.

[0079] The memory 701 is used to store computer programs that can run on the processor 702.

[0080] The memory 701 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0081] If the memory 701, processor 702, and communication interface 703 are implemented independently, then the communication interface 703, memory 701, and processor 702 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized into address buses, data buses, control buses, etc. For ease of representation, Figure 7 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0082] Optionally, in a specific implementation, if the memory 701, processor 702, and communication interface 703 are integrated on a single chip, then the memory 701, processor 702, and communication interface 703 can communicate with each other through an internal interface.

[0083] The processor 702 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0084] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described simulation method for the misuse of the bottom of a power battery.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0087] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0088] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0089] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0090] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

[0091] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0092] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A simulation method for the misuse condition of the bottom of a power battery, characterized in that, Includes the following steps: Based on the preset refined mesh model of the power battery and the preset simulation model of the power battery under the vehicle bottom misuse condition, the dynamic process of the power battery bottom being impacted is simulated to generate the initial simulation results of the power battery bottom misuse condition. Determine whether the initial simulation results of the power battery vehicle misuse condition meet the preset performance requirements. If the initial simulation results meet the preset performance requirements, the initial simulation results are compared with the actual vehicle test results. If there is a difference between the initial simulation results and the actual vehicle test results, the parameters in the simulation model are corrected to determine the final simulation results of the power battery vehicle bottom misuse condition based on the corrected model.

2. The method according to claim 1, characterized in that, Before simulating the dynamic process of the bottom of the power battery being impacted, based on a preset refined mesh model of the power battery and a preset simulation model of the power battery's misuse under the vehicle bottom, the following steps are also included: The power battery frame, cells, liquid cooling plate, and bottom protective plate are meshed to establish the preset refined mesh model of the power battery.

3. The method according to claim 1, characterized in that, Before simulating the dynamic process of the bottom of the power battery being impacted, based on a preset refined mesh model of the power battery and a preset simulation model of the power battery's misuse under the vehicle bottom, the following steps are also included: Create a complete vehicle model, a brick model, a ground model, and a pit model; Based on the vehicle model, the brick model, the ground model, and the pit model, a simulation model of the preset power battery vehicle bottom misuse condition is established.

4. The method according to claim 3, characterized in that, Before simulating the dynamic process of the bottom of the power battery being impacted, the following is also included: The vehicle model is controlled to drive towards the pit model at a preset speed. When the vehicle's wheels run over the brick model and the front end of the brick model slides into the pit model and hits the fixed baffle to stop moving, the rear end of the brick model tilts upward and contacts the bottom of the power battery, generating a dynamic process in which the bottom of the power battery is impacted.

5. The method according to claim 1, characterized in that, The simulation simulates the dynamic process of the bottom of the power battery being impacted, in order to generate initial simulation results of the power battery bottom misuse condition, including: The simulation simulates the dynamic process of the bottom of the power battery being impacted, in order to generate the strain of the power battery frame and bottom protection plate, the deformation of the battery cell, and the deformation and strain of the liquid cooling plate. Based on the strain of the power battery frame and the bottom protective plate, the sealing performance of the power battery frame and the bottom protective plate is evaluated to determine whether it meets the preset normal conditions, so as to generate a first evaluation result. Based on the deformation of the battery cell, assess whether the battery cell meets the preset thermal runaway risk conditions to generate a second assessment result; Based on the deformation and strain of the liquid cooling plate, assess whether the liquid cooling plate meets the preset leakage conditions to generate a third evaluation result; Based on the first evaluation result, the second evaluation result, and the third evaluation result, the initial simulation results of the power battery bottom misuse condition are generated.

6. The method according to claim 1, characterized in that, In response to a discrepancy between the initial simulation results and the actual vehicle test results, the parameters in the simulation model are corrected to determine the final simulation results of the power battery vehicle bottom misuse condition based on the corrected model, including: Check whether the initial simulation results and the actual vehicle test results meet the preset consistency conditions; If the similarity between the flipping angle and the lifting height of the brick model in the initial simulation results and the actual vehicle test results is greater than or equal to a preset threshold, then the initial simulation results and the actual vehicle test results are determined to meet the preset consistency condition, and the current simulation model is determined as the final model to generate the final simulation results of the power battery bottom misuse condition. Otherwise, if it is determined that there is a difference between the initial simulation results and the actual vehicle test results, the friction coefficient between the brick model and the ground model and the material property curve parameters of the brick model are corrected until the simulation results of the corrected model and the actual vehicle test results meet the preset consistency conditions, and then the final simulation result of the power battery bottom misuse condition is determined.

7. A simulation device for simulating the misuse of the bottom of a power battery, characterized in that, include: The initial simulation module is used to simulate the dynamic process of the bottom of the power battery being impacted based on the preset refined mesh model of the power battery and the preset simulation model of the power battery under the vehicle misuse condition, so as to generate the initial simulation results of the power battery under the misuse condition. The judgment module is used to determine whether the initial simulation results of the power battery vehicle misuse condition meet the preset performance requirements. The final simulation module is used to compare the initial simulation results with the actual vehicle test results when the initial simulation results meet the preset performance requirements, and to correct the parameters in the simulation model when there are differences between the initial simulation results and the actual vehicle test results, so as to determine the final simulation results of the power battery vehicle bottom misuse condition based on the corrected model.

8. The apparatus according to claim 7, characterized in that, Also includes: The meshing module is used to mesh the power battery frame, cells, liquid cooling plate and bottom guard plate before simulating the dynamic process of the power battery bottom being impacted, based on a preset refined mesh model of the power battery and a preset simulation model of the power battery under the vehicle's misuse conditions, in order to establish the preset refined mesh model of the power battery.

9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the simulation method for the misuse of the bottom of a power battery as described in any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the simulation method for the misuse of the bottom of the power battery as described in any one of claims 1-6.

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