Battery pack collision test method, device and equipment and storage medium

Abstract

The invention provides a battery pack collision test method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining an initial specification parameter of a to-be-tested battery pack of a vehicle, constructing a battery pack bottom scraping simulation model according to the initial specification parameter of the battery pack, and carrying out the collision simulation of the battery pack bottom scraping simulation model through employing a preset simulation working condition, the method comprises the steps of obtaining a collision simulation result of a battery pack, adjusting an initial specification parameter of the battery pack, freezing a current specification parameter of the battery pack under the condition that the collision condition and the stress condition of the battery pack meet a first preset test condition, and carrying out physical test on the battery pack according to the current specification parameter of the battery pack to obtain a physical test result of the battery pack, and adjusting the current specification parameter of the battery pack according to the physical test result, and determining a target specification parameter of the battery pack meeting a second preset test condition. According to the invention, the safety of the battery pack is improved through comprehensive analysis of simulation test and physical test on the connectors and parts of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a battery pack collision test method, device, equipment and storage medium. Background Art

[0002] With the popularity of electric vehicles, the safety performance requirements for battery packs are getting higher and higher. The battery packs of electric vehicles are usually arranged at the bottom of the vehicle. This design helps to lower the center of gravity of the vehicle, improve handling stability, and make more efficient use of vehicle space. The bottom of the battery pack is an important component of the battery pack structure. It is affected by external impacts such as road obstacles, potholes, and stones, which can easily cause deformation of the bottom structure of the battery pack and cause damage to the battery cells in the pack, thereby increasing the risk of damage to the battery pack.

[0003] Current battery pack simulation tests usually only use battery packs or battery cells to evaluate the safety of battery pack bottom scraping, and lack consideration of the battery pack's peripheral components and application scenarios, resulting in incomplete battery pack simulation test factors and affecting the accuracy of the battery pack simulation test results. Summary of the invention

[0004] In view of this, the present invention aims to propose a battery pack collision test method, device, electronic device and storage medium to solve the problem that the simulation test factors of the battery pack are incomplete, which affects the accuracy of the simulation test results of the battery pack.

[0005] According to a first aspect of the present invention, a battery pack collision test method is provided, the method comprising:

[0006] Obtain the initial specification parameters of the battery pack to be tested in the vehicle, and build a battery pack bottom scraping simulation model based on the initial specification parameters of the battery pack;

[0007] Using a preset simulation condition to perform a collision simulation on the battery pack bottom scraping simulation model to obtain a collision simulation result of the battery pack; wherein the collision simulation result includes the impact condition of the battery pack connector and the stress condition of the battery pack components;

[0008] Adjusting the initial specification parameters of the battery pack, and freezing the current specification parameters of the battery pack when the impact condition and the force condition of the battery pack meet the first preset test condition;

[0009] Performing a physical test on the battery pack according to current specification parameters of the battery pack to obtain a physical test result of the battery pack;

[0010] The current specification parameters of the battery pack are adjusted according to the physical test results to determine the target specification parameters of the battery pack that meet the second preset test conditions.

[0011] Optionally, the obtaining of initial specification parameters of a battery pack to be tested in a vehicle and constructing a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack includes:

[0012] Obtaining initial specification parameters of the battery pack to be tested of the vehicle; wherein the initial specification parameters include anti-collision structure parameters, battery pack structure parameters, and battery pack material parameters;

[0013] Create a whole vehicle model and a battery pack model respectively according to the anti-collision structure parameters, battery pack structure parameters and battery pack material parameters;

[0014] The battery pack model is integrated into the whole vehicle model to obtain a battery pack bottom scraping simulation model.

[0015] Optionally, the using a preset simulation condition to perform a collision simulation on the battery pack bottom scraping simulation model to obtain a collision simulation result of the battery pack includes:

[0016] Determine a preset simulation working condition; wherein the preset simulation working condition includes a wall to be hit and a collision speed;

[0017] The battery pack bottom scraping simulation model is adjusted so that the connector port of the battery pack is directly opposite to the barrier to be hit, and the lowest point of the battery pack overlaps the barrier to be hit by a preset height;

[0018] The battery pack bottom scraping simulation model is caused to impact the barrier to be impacted at the impact speed to perform a collision simulation, the impact condition of the battery pack connector and the stress condition of the battery pack components are monitored, and the collision simulation result of the battery pack is obtained.

[0019] Optionally, the adjusting the initial specification parameters of the battery pack, when the impact condition and the force condition of the battery pack meet a first preset test condition, freezing the current specification parameters of the battery pack includes:

[0020] According to the collision simulation result of the battery pack, determining whether the initial specification parameters of the battery pack meet a first preset test condition;

[0021] If the stress of the battery pack connector and components is less than the allowable stress, the initial specification parameters of the battery pack meet the first preset test condition;

[0022] Otherwise, the initial specification parameters of the battery pack are adjusted, and the current specification parameters of the battery pack that meet the first preset test condition are frozen.

[0023] Optionally, otherwise, adjusting the initial specification parameters of the battery pack to freeze the current specification parameters of the battery pack that meet the first preset test condition includes:

[0024] If the initial specification parameters of the battery pack do not meet the first preset test condition, adjusting at least one of the anti-collision structure parameters, the battery pack structure parameters, and the battery pack material parameters in the initial specification parameters;

[0025] When the adjusted current specification parameters meet the first preset test condition, the current specification parameters are frozen.

[0026] Optionally, performing a physical test on the battery pack according to current specification parameters of the battery pack to obtain a physical test result of the battery pack includes:

[0027] Creating a physical test condition according to the current specification parameters of the battery pack and the preset simulation condition;

[0028] Performing a physical test on the battery pack under the physical test conditions; the physical test includes a collision test and a safety test;

[0029] The test results of the collision test and the safety test are determined as the physical test results of the battery pack.

[0030] Optionally, adjusting the current specification parameters of the battery pack according to the physical test result to determine the target specification parameters of the battery pack that meet the second preset test condition includes:

[0031] According to the physical test result, determining whether the current specification parameters of the battery pack meet a second preset test condition;

[0032] If the current specification parameters of the battery pack meet the second preset test condition, the current specification parameters of the battery pack are determined to be target specification parameters.

[0033] According to a second aspect of the present invention, a battery pack collision test device is provided, the device comprising:

[0034] A model building module is used to obtain the initial specification parameters of the battery pack to be tested in the vehicle, and to build a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack;

[0035] A collision simulation module, used to perform collision simulation on the battery pack bottom scraping simulation model using preset simulation conditions to obtain collision simulation results of the battery pack; wherein the collision simulation results include the impact conditions of the battery pack connector and the stress conditions of the battery pack components;

[0036] a first parameter determination module, configured to adjust initial specification parameters of the battery pack, and freeze current specification parameters of the battery pack when the impact condition and force condition of the battery pack meet a first preset test condition;

[0037] A physical testing module, used to perform a physical test on the battery pack according to current specification parameters of the battery pack to obtain a physical test result of the battery pack;

[0038] The second parameter determination module is used to adjust the current specification parameters of the battery pack according to the physical test results to determine the target specification parameters of the battery pack that meet the second preset test conditions.

[0039] According to another aspect of the present invention, there is also provided an electronic device, comprising:

[0040] processor;

[0041] a memory for storing instructions executable by the processor;

[0042] Wherein, the processor is configured to execute the instructions to implement the battery pack collision test method as described above.

[0043] According to another aspect of the present invention, a readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the battery pack collision test method as described above are implemented.

[0044] The battery pack collision test method provided by the embodiment of the present invention obtains the initial specification parameters of the battery pack to be tested of the vehicle, constructs a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack, performs collision simulation on the battery pack bottom scraping simulation model using preset simulation conditions, obtains the collision simulation result of the battery pack, adjusts the initial specification parameters of the battery pack, freezes the current specification parameters of the battery pack when the impact and force conditions of the battery pack meet the first preset test conditions, performs a physical test on the battery pack according to the current specification parameters of the battery pack, obtains the physical test results of the battery pack, adjusts the current specification parameters of the battery pack according to the physical test results, and determines the target specification parameters of the battery pack that meet the second preset test conditions. The embodiment of the present invention constructs a battery pack bottom scraping simulation model for simulation and physical testing, comprehensively analyzes the stress conditions of the connectors and components of the battery pack, verifies the accuracy of the simulation results in combination with physical tests, optimizes the structural layout and material parameters, and achieves that both simulation and actual measurement meet the requirements. The optimized battery pack specification parameters can effectively avoid excessive stress of connectors and components, and ensure the safety performance of the battery pack under the condition of bottom scraping. Through the analysis method that combines simulation with actual measurement, we avoid hitting weak locations such as the connectors at the end of the battery pack, and ensure that the stress or strain of the bottom components and cells does not exceed the allowable stress or strain, thereby improving the safety and reliability of the battery pack and achieving the goal of improving development progress, development quality and reducing development costs.

[0045] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0047] Figure 1 is a flowchart of the steps of a battery pack collision test method provided by an embodiment of the present invention;

[0048] Figure 2 yes Figure 1 A flowchart of step 101 in the battery pack collision test method provided by an embodiment of the present invention;

[0049] Figure 3 yes Figure 1 A flowchart of step 102 in the battery pack collision test method provided by an embodiment of the present invention;

[0050] Figure 4 yes Figure 1 A flowchart of step 103 in the battery pack collision test method provided by an embodiment of the present invention;

[0051] Figure 5 yes Figure 1 A flowchart of step 104 in the battery pack collision test method provided by an embodiment of the present invention;

[0052] Figure 6 yes Figure 1 A flowchart of step 105 in the battery pack collision test method provided by an embodiment of the present invention;

[0053] Figure 7 is a schematic diagram of a battery pack collision test in a battery pack collision test method provided by an embodiment of the present invention;

[0054] Figure 8 is a schematic diagram of an anti-collision structure in a battery pack collision test method provided by an embodiment of the present invention;

[0055] Fig. 9 is a schematic diagram of a battery pack structure in a battery pack collision test method provided by an embodiment of the present invention;

[0056] Fig.10The simulation results of a battery pack collision test method provided by an embodiment of the present invention are shown in FIG. Figure 1 ;

[0057] Fig.11 The simulation results of a battery pack collision test method provided by an embodiment of the present invention are shown in FIG. Figure 2 ;

[0058] Fig.12 The simulation results of a battery pack collision test method provided by an embodiment of the present invention are shown in FIG. Figure 3 ;

[0059] Fig.13 is a structural schematic diagram of a battery pack collision test device provided by an embodiment of the present invention;

[0060] Fig.14 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention.

[0061] Description of reference numerals:

[0062] 1- vehicle model, 2- battery pack, 3- anti-collision structure, 4- barrier, 5- bottom guard plate, 6- bottom guard plate sealing ring, 7- cold plate rivet nut, 8- buffer foam, 9- lower flow channel plate, 10- upper heat sink, 11- liquid cooling plate sealing ring, 12- thermal conductive structural adhesive, 13- battery cell. DETAILED DESCRIPTION

[0063] To make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the embodiments of the present invention, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can be implemented. The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined and referenced with each other without contradiction.

[0064] Reference Figure 1 , shows a flowchart of the steps of a battery pack collision test method provided by an embodiment of the present invention, the method may include:

[0065] Step 101, obtaining initial specification parameters of the battery pack to be tested of the vehicle, and constructing a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack.

[0066] In an embodiment of the present invention, in order to solve the problem that the simulation test factors of the battery pack are not comprehensive and affect the accuracy of the simulation test results of the battery pack, this embodiment simulates and measures the battery pack, and ensures that impacts on weak positions such as the connectors at the end of the battery pack are avoided according to the simulation test results and the measured results, and the stress or strain of each component and battery cell at the bottom of the battery pack does not exceed the allowable stress or strain, thereby improving the impact resistance of the bottom and better protecting the battery cells, and ultimately achieving that both the simulation and the actual measurement meet the requirements. Through a test method that combines simulation and actual measurement, the data that best protects the safety performance of the battery pack is frozen, forming a closed-loop vehicle-level battery pack bottom scraping safety test, thereby achieving the purpose of improving development progress, development quality and reducing development costs.

[0067] Specifically, refer to Figure 7 , showing a schematic diagram of a battery pack collision test in a battery pack collision test method provided by an embodiment of the present invention, obtaining initial specification parameters of a battery pack to be tested in a vehicle, constructing a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack, and collecting initial specification parameters of various components at the bottom of the battery pack to be tested by actual testing or querying design data, wherein the initial specification parameters include anti-collision structure parameters, battery pack structure parameters, and battery pack material parameters, specifically including battery pack size, the number of battery modules contained in the battery pack, battery cell (cell) size, type of buffer material inside the battery pack, thickness, position, size, material, etc. of connectors at the front and rear of the battery pack, and position, size, material, etc. of the anti-collision structure.

[0068] It should be noted that the battery anti-collision structure serves as a warning at low speeds. At high speeds, the barrier directly crosses the battery pack. Early models generally use a subframe as a simple battery pack anti-collision structure, but the subframe is sometimes not lower than the battery pack, so it cannot provide protection. When the barrier passes, only the subframe provides limited protection, causing the battery pack connector to be impacted and cracked, and ultimately causing the battery pack to fail in airtightness, resulting in risks such as water ingress and fire. In this embodiment, refer to Figure 8 , showing a schematic diagram of an anti-collision structure in a battery pack collision test method provided by an embodiment of the present invention, a separate anti-collision structure is added at the position of the subframe, and the anti-collision structure plays a role in lifting the entire vehicle when the barrier passes, thereby avoiding direct impact on the battery pack plug-in, and adding an arc-shaped design downward in the Z direction of the anti-collision structure will further lift the entire vehicle and reduce the possibility of impacting the battery pack.

[0069] Reference Fig. 9, showing a schematic diagram of the battery pack structure in a battery pack collision test method provided by an embodiment of the present invention, the vehicle battery pack to be tested in this embodiment, the battery pack includes a bottom guard plate, a bottom guard plate sealing ring, a cold plate pressure rivet nut, a buffer foam, a lower flow channel plate, an upper heat sink, a liquid cold plate sealing ring, a thermal conductive structural adhesive, and a battery cell, wherein the bottom guard plate at the bottom of the battery pack is used as the first layer of protection. In this embodiment, a steel material with high strength and high elongation at break is selected, the second layer at the bottom is the buffer foam, and the third layer is the liquid cold plate. The liquid cold plate is divided into a lower flow channel plate and an upper heat sink. Since the stiffness and elongation at break of the aluminum alloy material are relatively The existence of buffer foam is to reduce the possibility of bottom impact and scratching the cold plate. The fourth layer is the thermal conductive structural glue at the bottom of the battery cell, which can resist the bottom impact to a certain extent. The battery cell is above the glue, and the battery cell is the object that needs protection most. Therefore, there is a multi-layer protection structure design at the bottom of the battery cell. With the action of the front anti-collision structure, the whole vehicle is lifted, and the front end of the battery pack is basically not scratched. However, since the battery pack is relatively long, the tail still collides with the barrier, which makes the bottom structure of the battery pack and the battery cell deformed under pressure. The primary task of the battery pack bottom scraping simulation is to ensure the safety of the battery cell, and the battery cell cannot have serious failures such as leakage.

[0070] Step 102, using preset simulation conditions to perform collision simulation on the battery pack bottom scraping simulation model to obtain collision simulation results of the battery pack; wherein the collision simulation results include the impact conditions of the battery pack connectors and the stress conditions of the battery pack components.

[0071] In an embodiment of the present invention, after constructing a battery pack bottom-scraping simulation model, a preset simulation condition is used to perform collision simulation on the battery pack bottom-scraping simulation model. The preset simulation condition includes battery power, vehicle weight, impact speed, and barrier to be hit. For example, this embodiment uses the condition set in Appendix N of 2024C-NCAP as an example for explanation. The preset simulation condition is that the battery is fully charged, the vehicle curb weight plus the front weight of two 80kg dummies, and the vehicle hits a hemispherical steel barrier with a diameter of 150mm at a speed of 30km / h to 31km / h. The Y-direction position of the barrier is opposite to the battery pack connector port and overlaps with the lowest point of the battery pack by 30mm to 34mm in the Z-direction.

[0072] In this embodiment, with the help of the anti-collision structure, the entire vehicle is lifted up, and the front end of the battery pack is basically not scratched. However, since the battery pack is relatively long, the rear end still collides with the barrier, causing the bottom structural parts and battery cells of the battery pack to be compressed and deformed. In this embodiment, the primary task of constructing a battery pack bottom scraping simulation model and performing battery pack bottom scraping simulation is to ensure the safety of the battery cells, and the battery cells cannot suffer from serious failures such as leakage.

[0073] Step 103, adjusting the initial specification parameters of the battery pack, and freezing the current specification parameters of the battery pack when the impact condition and the force condition of the battery pack meet the first preset test condition.

[0074] In an embodiment of the present invention, based on the collision simulation results of the battery pack, it is determined whether the initial specification parameters of the battery pack meet the first preset test conditions, and the first preset test conditions include whether the stress of the battery pack connectors and components is less than the allowable stress. If the stress of the battery pack connectors and components is less than the allowable stress, the initial specification parameters of the battery pack meet the first preset test conditions; otherwise, the initial specification parameters of the battery pack are adjusted and the current specification parameters of the battery pack that meet the first preset test conditions are frozen.

[0075] Step 104 , performing a physical test on the battery pack according to the current specification parameters of the battery pack to obtain a physical test result of the battery pack.

[0076] In an embodiment of the present invention, a physical test condition is created based on the current specification parameters of the battery pack and the preset simulation conditions, and the battery pack is physically tested under the physical test condition; the physical test includes a collision test and a safety test, and the test results of the collision test and the safety test are determined as the physical test results of the battery pack.

[0077] Specifically, test verification is carried out under actual test conditions according to the specification parameters frozen in the simulation. The collision test specifically checks the stress, strain, and deformation of the battery pack connectors and the bottom components to determine whether they meet the relevant standards and requirements. The safety test specifically checks the insulation resistance and waterproof performance of the battery pack to determine whether they meet the relevant standards and requirements. If there are unsatisfactory items in the test, the structural layout and material parameters are optimized according to the failure phenomenon to ensure that both simulation and actual measurement meet the requirements. The analysis method combining simulation and actual measurement is used to guide the optimal data freezing and formulation of actual measurement plans. The simulation accuracy is calibrated with the actual measurement results to form a closed-loop vehicle-level battery pack bottom scraping design verification method, which ultimately achieves the goal of improving development progress, development quality and reducing development costs.

[0078] Step 105 , adjusting the current specification parameters of the battery pack according to the actual test results, and determining the target specification parameters of the battery pack that meet the second preset test conditions.

[0079] In an embodiment of the present invention, after completing the physical test of the battery pack, it is determined whether the performance of the battery pack in the collision test and the safety test meets the relevant standards and requirements based on the physical test results. Specifically, the stress, strain, and deformation of the battery pack connector and the bottom components are checked to determine whether they meet the relevant standards and requirements. The insulation resistance and waterproof performance of the battery pack are checked to determine whether they meet the relevant standards and requirements. If the stress, strain, and deformation of the battery pack connector and the bottom components meet the relevant standards and requirements, the current specification parameters of the battery pack are determined to be the target specification parameters.

[0080] The battery pack collision test method provided by the embodiment of the present invention obtains the initial specification parameters of the battery pack to be tested of the vehicle, constructs a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack, performs collision simulation on the battery pack bottom scraping simulation model using preset simulation conditions, obtains the collision simulation result of the battery pack, adjusts the initial specification parameters of the battery pack, freezes the current specification parameters of the battery pack when the impact and force conditions of the battery pack meet the first preset test conditions, performs a physical test on the battery pack according to the current specification parameters of the battery pack, obtains the physical test results of the battery pack, adjusts the current specification parameters of the battery pack according to the physical test results, and determines the target specification parameters of the battery pack that meet the second preset test conditions. The embodiment of the present invention constructs a battery pack bottom scraping simulation model for simulation and physical testing, comprehensively analyzes the stress conditions of the connectors and components of the battery pack, verifies the accuracy of the simulation results in combination with physical tests, optimizes the structural layout and material parameters, and achieves that both simulation and actual measurement meet the requirements. The optimized battery pack specification parameters can effectively avoid excessive stress of connectors and components, and ensure the safety performance of the battery pack under the condition of bottom scraping. Through the analysis method that combines simulation with actual measurement, we avoid hitting weak locations such as the connectors at the end of the battery pack, and ensure that the stress or strain of the bottom components and cells does not exceed the allowable stress or strain, thereby improving the safety and reliability of the battery pack and achieving the goal of improving development progress, development quality and reducing development costs.

[0081] Further, see Figure 2 , showing Figure 1 A flowchart of step 101 in a battery pack collision test method is provided. The method is substantially the same as the battery pack collision test method provided in the first embodiment of the present invention. Step 101 may include:

[0082] Step 1011, obtaining initial specification parameters of the battery pack to be tested of the vehicle; wherein the initial specification parameters include anti-collision structure parameters, battery pack structure parameters and battery pack material parameters;

[0083] Step 1012, creating a vehicle model and a battery pack model respectively according to the anti-collision structure parameters, the battery pack structure parameters and the battery pack material parameters;

[0084] Step 1013, integrating the battery pack model into the whole vehicle model to obtain a battery pack bottom scraping simulation model.

[0085] It should be noted that this embodiment obtains the initial specification parameters of the battery pack to be tested in the vehicle, the initial specification parameters include anti-collision structure parameters, battery pack structure parameters and battery pack material parameters, creates the anti-collision structure of the whole vehicle model based on the anti-collision structure parameters, creates the geometric model of the battery pack according to the battery pack structure parameters and material parameters, including battery cells, buffer materials, cooling system, connectors, etc., and imports the whole vehicle model and the battery pack model into the simulation software. In some embodiments, CAE simulation software can be used for structural mechanics, collision simulation and material nonlinear analysis, and the material properties of each component can be defined in the simulation software according to the battery pack material parameters.

[0086] The embodiment of the present invention can significantly improve the design efficiency by obtaining the initial specification parameters of the vehicle battery pack to be tested and constructing a battery pack bottom-scraping simulation model based on the parameters. The simulation model can quickly evaluate the battery pack performance of different design schemes, thereby shortening the development cycle.

[0087] Further, see Figure 3 , showing Figure 1 A flowchart of step 102 in a battery pack collision test method is provided. The method is substantially the same as the battery pack collision test method provided in the first embodiment of the present invention. Step 102 may include:

[0088] Step 1021, determining a preset simulation condition; wherein the preset simulation condition includes a wall to be hit and a collision speed;

[0089] Step 1022, adjusting the battery pack bottom scraping simulation model so that the connector port of the battery pack is directly opposite to the barrier to be collided, and the lowest point of the battery pack overlaps the barrier to be collided by a preset height.

[0090] Step 1023, the battery pack bottom scraping simulation model is subjected to collision simulation by impacting the barrier to be impacted at an impact speed, the impact condition of the battery pack connector and the stress condition of the battery pack components are monitored, and the collision simulation result of the battery pack is obtained.

[0091] It should be noted that before performing the battery pack scraping simulation, it is necessary to first determine the preset simulation conditions, which include the barrier to be hit and the impact speed. The barrier to be hit can be a hemispherical steel barrier with a diameter of 150mm. The impact speed of this embodiment is set to the vehicle hitting the barrier to be hit at a speed of 30km / h-31km / h. In actual simulation, the simulation conditions can be set according to the vehicle and battery pack specifications, and are not specifically limited here. In this embodiment, the preset simulation working conditions include a barrier to be hit and an impact speed. Specifically, this embodiment uses the working conditions set in Appendix N of 2024C-NCAP as an example for illustration. During the simulation, the battery is set to be fully charged, the curb weight of the vehicle plus the front counterweight of two 80kg dummies, and the battery pack bottom scraping simulation model is adjusted to the point where the connector port of the battery pack is directly opposite to the barrier to be hit, and the lowest point of the battery pack overlaps the barrier to be hit by a preset height. The battery pack bottom scraping simulation model hits the barrier to be hit at an impact speed for collision simulation. The vehicle hits a hemispherical steel barrier with a diameter of 150mm at a speed of 30km / h to 31km / h. The Y-axis position of the barrier is directly opposite to the connector port of the battery pack and overlaps with the lowest point of the battery pack by 30mm to 34mm in the Z-axis.

[0092] Specifically, the battery pack bottom scraping simulation model is adjusted so that the connector port of the battery pack is directly facing the barrier to be collided, and the lowest point of the battery pack overlaps with the barrier to be collided by a preset height, the positions of the front and rear connector ports of the battery pack are adjusted to ensure that the connector ports are directly facing the barrier to be collided, and the position of the battery pack is adjusted so that its lowest point overlaps with the barrier to be collided by a preset height (e.g., 30mm-34mm) to ensure that the lowest point of the battery pack overlaps with the Z position of the barrier to be collided. The geometric positions of the battery pack connector ports and the lowest point can be checked in the simulation software to ensure that the adjusted positions meet the preset working conditions.

[0093] In this embodiment, the battery pack bottom scraping simulation model is used to impact the barrier to be hit at the impact speed to perform collision simulation, monitor the impact of the battery pack connector and the stress of the battery pack components, and obtain the collision simulation result of the battery pack. Specifically, when performing the simulation, the battery pack bottom scraping simulation model is placed under the simulation working condition, the initial speed of the vehicle is 30km / h-31km / h, the battery pack is fully charged, the front counterweight is 2 80kg dummies, the Y-axis position of the barrier is set to face the battery pack connector port, and the Z-axis overlaps with the lowest point of the battery pack by 30mm-34mm, and the results to be output, such as stress, strain, deformation, etc., are set, the simulation model is run, and numerical calculations are performed. During the simulation process, the calculation progress and results are monitored to ensure the stability and accuracy of the simulation process. Monitor the stress of the battery pack connector during the collision process to determine whether it is hit, and monitor the stress of the battery pack components to analyze the stress distribution and strain of the components and cells at the bottom of the battery pack to determine whether the allowable stress or strain requirements are met.

[0094] The embodiment of the present invention comprehensively analyzes the impact condition of the battery pack connector and the stress condition of the battery pack components through collision simulation, and comprehensively analyzes the stress condition of the battery pack connector and each component to improve the accuracy of the battery pack bottom scraping simulation result.

[0095] Further, see Figure 4 , showing Figure 1 A flowchart of step 103 in a battery pack collision test method is provided. The method is substantially the same as the battery pack collision test method provided in the first embodiment of the present invention. Step 103 may include:

[0096] Step 1031 , judging whether the initial specification parameters of the battery pack meet the first preset test condition according to the collision simulation result of the battery pack.

[0097] Step 1032, if the stress of the battery pack connector and components is less than the allowable stress, the initial specification parameters of the battery pack meet the first preset test condition.

[0098] Step 1033: otherwise, adjust the initial specification parameters of the battery pack and freeze the current specification parameters of the battery pack that meet the first preset test condition.

[0099] It should be noted that after performing the battery pack bottom scraping simulation, it is necessary to determine whether the initial specification parameters of the battery pack meet the first preset test conditions based on the simulation results. The first preset test conditions include whether the stress of the battery pack connector and components is less than the allowable stress. Specifically, determine whether the stress distribution of the battery pack connector and the bottom components, the strain distribution of the battery pack connector and the bottom components, and the deformation of the battery pack connector and the bottom components are less than the allowable stress. If the stress is less than the allowable stress, the initial specification parameters of the battery pack meet the first preset test conditions. Among them, the allowable stress refers to the maximum stress value that the material is allowed to withstand under normal working conditions. It is calculated based on the mechanical properties and design requirements of the material through a certain safety factor. The allowable stress is used to ensure that the material will not be damaged or fail during actual use, thereby ensuring the safety and reliability of the structure. This embodiment does not specifically limit the specific values ​​of the allowable stress of the battery pack connector and components.

[0100] Specifically, if the stress of the battery pack connectors and components is less than the allowable stress, the initial specification parameters of the battery pack meet the first preset test conditions; otherwise, the initial specification parameters of the battery pack to be tested are adjusted, and the current specification parameters of the battery pack that meet the first preset test conditions are frozen; if the stress of the battery pack connectors and components are all less than the allowable stress, it is considered that the initial specification parameters of the battery pack meet the first preset test conditions; otherwise, the initial specification parameters of the battery pack are adjusted to meet the first preset test conditions, and the current specification parameters are frozen.

[0101] Through simulation analysis, the embodiment of the present invention can avoid impacting weak positions such as connectors at the end of the battery pack, ensure that the stress or strain of the bottom components and battery cells does not exceed the allowable stress or strain, thereby improving the safety and reliability of the battery pack.

[0102] Specifically, step 1033, otherwise, adjusting the initial specification parameters of the battery pack to be tested, and freezing the current specification parameters of the battery pack that meets the first preset test condition may specifically include the following steps:

[0103] First, if the initial specification parameters of the battery pack do not meet the first preset test condition, at least one of the anti-collision structure parameters, the battery pack structure parameters, and the battery pack material parameters in the initial specification parameters is adjusted;

[0104] Secondly, when the adjusted current specification parameters meet the first preset test condition, the current specification parameters are frozen.

[0105] It should be noted that in the above steps, if the initial specification parameters of the battery pack do not meet the first preset test conditions, at least one of the anti-collision structure parameters, battery pack structure parameters and battery pack material parameters in the initial specification parameters is adjusted. If the stress of the battery pack connector is greater than the allowable stress, it is considered that the connector does not meet the first preset test conditions. If the stress of each component at the bottom of the battery pack is greater than the allowable stress, it is considered that the component does not meet the first preset test conditions. If the stress of the battery pack connector and the component are both greater than the allowable stress, it is considered that the initial specification parameters of the battery pack do not meet the first preset test conditions. The initial specification parameters are adjusted. Specifically, the thickness of key components can be increased, the shape of components can be optimized, or the material selection can be optimized to improve the stress resistance of the battery pack, and the specification parameters that meet the first preset test conditions are frozen. After optimizing the structural design and material selection, rerun the simulation model to verify whether the optimized design meets the first preset test conditions. If the optimized design meets the first preset test conditions, the current specification parameters are frozen as the final design parameters.

[0106] For example, if the initial specification parameters of the battery pack do not meet the first preset test conditions, at least one of the anti-collision structure parameters, battery pack structure parameters, and battery pack material parameters in the initial specification parameters is adjusted. If the material of the bottom guard plate is changed, for example, the 0.8mm thick HC950 / 1300HS material is replaced with the 1mm thick HC340 / 590DP with a larger elongation at break and lower yield and tensile strength, through simulation comparative analysis, the strain of the bottom guard plate with low stiffness is greater, and the impact effect on the liquid cooling plate and the battery cell will be weakened to a certain extent. If the wall thickness of the water cooling plate is thickened (1.2mm thickened to 1.7mm), through comparative analysis, the liquid cooling plate is thickened, and the protection of the bottom of the battery cell is strengthened, and the impact effect on the battery cell will be weakened to a certain extent.

[0107] Further, see Figure 5 , showing Figure 1 A flowchart of step 104 in a battery pack collision test method is provided. The method is substantially the same as the battery pack collision test method provided in the first embodiment of the present invention. Step 104 may include:

[0108] Step 1041, creating a physical test condition based on the current specification parameters of the battery pack and the preset simulation condition.

[0109] Step 1042, subjecting the battery pack to a physical test under physical test conditions; the physical test includes a collision test and a safety test.

[0110] Step 1043, determining the test results of the collision test and the safety test as the physical test results of the battery pack.

[0111] It should be noted that in the above steps, physical test conditions are created based on the current specification parameters of the battery pack and the preset simulation conditions. After completing the simulation analysis of the battery pack and freezing the specification parameters that meet the first preset test conditions, physical test conditions are created based on the current specification parameters of the battery pack and the preset simulation conditions, and the battery pack is physically tested in the physical test conditions.

[0112] Specifically, the impact test bench is started to make the vehicle hit the barrier at a predetermined speed. The vehicle hits a hemispherical steel barrier with a diameter of 150mm at a speed of 30km / h-31km / h for collision test. The stress, strain, deformation, energy absorption and other data during the collision are recorded. The battery pack is also tested for safety. The safety test includes measuring the insulation resistance of the battery pack to ensure that the insulation requirements are met, and the battery pack is submerged in water to observe whether the battery pack catches fire and ensure that the battery pack will not be flooded. The test results of the collision test and the safety test are determined as the physical test results of the battery pack, among which the collision test results include the stress distribution of the battery pack connector and the bottom components during the collision test, as well as the deformation of the battery pack connector and the bottom components.

[0113] For example, according to the requirements of Appendix N of 2024C-NCAP, the plastic strain of the battery cell does not exceed the allowable strain (the battery cell does not break the shell), the bottom guard plate of the battery pack is sealed normally, and water does not penetrate into the battery cell compartment during the submersion test. It can be judged that the insulation of the battery pack is normal, there is no risk of fire or explosion within 30 minutes after the collision, and there is no risk of fire or explosion during the immersion test and the battery pack is left out of water for 2 hours. The current specification parameters obtained by simulation are verified, and the product design plan is frozen after the test passes.

[0114] Through physical testing, the embodiments of the present invention can avoid impacting weak positions such as the connectors at the end of the battery pack, ensure that the stress or strain of the bottom components and battery cells does not exceed the allowable stress or strain, thereby improving the safety and reliability of the battery pack, and ultimately achieving that both simulation and actual measurement meet the requirements.

[0115] Further, see Figure 6 , showing Figure 1 A flowchart of step 105 in a battery pack collision test method is provided. The method is substantially the same as the battery pack collision test method provided in the first embodiment of the present invention. Step 105 may include:

[0116] Step 1051, judging whether the current specification parameters of the battery pack meet the second preset test conditions according to the actual test results.

[0117] Step 1052: If the current specification parameters of the battery pack meet the second preset test condition, determine that the current specification parameters of the battery pack are target specification parameters.

[0118] It should be noted that in the embodiment of the present invention, after the physical test of the battery pack is completed, it is determined whether the current specification parameters of the battery pack meet the second preset test conditions according to the physical test results. The second preset test conditions generally include whether the performance of the battery pack in the collision test and the safety test meets the relevant standards and requirements. Specifically, the stress, strain, and deformation of the battery pack connector and the bottom components are checked to determine whether the relevant standards and requirements are met. The insulation resistance and waterproof performance of the battery pack are checked to determine whether the relevant standards and requirements are met. If the stress, strain, and deformation of the battery pack connector and the bottom components meet the relevant standards and requirements, it is considered that the collision test meets the second preset test conditions. If the insulation resistance and waterproof performance of the battery pack meet the relevant standards and requirements, it is considered that the safety test meets the second preset test conditions. If the current specification parameters of the battery pack meet the second preset test conditions in both the collision test and the safety test, the current specification parameters of the battery pack are determined to be the target specification parameters.

[0119] Reference Fig.10 , Fig.11 as well as Fig.12, showing a schematic diagram of simulation results in a battery pack collision test method provided by an embodiment of the present invention. According to the residual deformation and plastic strain of the battery cell, if the residual deformation and plastic strain of the battery cell do not exceed the allowable strain (threshold), the safety requirements are met; the bottom guard plate is the first structural protection, taking into account the sealing function, and a simulated force analysis of the bottom guard plate is carried out. Special attention should be paid to whether the sealing structure of the bottom guard plate is damaged. If the sealing of the bottom guard plate fails, and the bolts at the bottom of the battery pack may be scraped crooked when scraping the bottom, water may penetrate into the battery cell compartment from the position of the bolts during the submerged test of the battery pack, causing short circuit and other faults; the upper and lower liquid cooling plates are A separate simulation stress analysis was conducted, and the strain of the lower cold plate exceeded the allowable strain (threshold value), and the strain of the upper cold plate did not exceed the allowable strain. If the bottom guard plate seal fails (including cracks in the main body or cracks in the sealing ring), the upper and lower cold plates will both crack (exceeding the allowable strain), and water will penetrate into the battery cell compartment during the submersion test. If the bottom guard plate seal fails and the upper cold plate does not crack, water will not penetrate into the battery cell compartment during the submersion test. If the bottom guard plate seal does not fail, and the upper and lower cold plates are both cracked, water will not penetrate into the battery cell compartment during the submersion test. In addition, it should be noted that if the test conditions are met, the lowest cost or lighter weight solution can be selected for data freezing.

[0120] The embodiment of the present invention ensures the safety performance of the battery pack under specific working conditions through the design verification of the scraped bottom of the battery pack at the vehicle level. According to the simulation results, the structural layout and material parameters are optimized, and finally the effect that both the simulation and actual measurement meet the requirements is achieved.

[0121] Reference Fig.13 , showing a schematic structural diagram of a battery pack collision test device provided by an embodiment of the present invention, the device comprising:

[0122] A model building module 201 is used to obtain initial specification parameters of the battery pack to be tested of the vehicle, and to build a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack;

[0123] A collision simulation module 202 is used to perform a collision simulation on the battery pack bottom scraping simulation model using a preset simulation condition to obtain a collision simulation result of the battery pack; wherein the collision simulation result includes the impact condition of the battery pack connector and the stress condition of the battery pack components;

[0124] A first parameter determination module 203, configured to adjust initial specification parameters of the battery pack, and freeze current specification parameters of the battery pack when the impact condition and force condition of the battery pack meet a first preset test condition;

[0125] A physical testing module 204, configured to perform a physical test on the battery pack according to current specification parameters of the battery pack to obtain a physical test result of the battery pack;

[0126] The second parameter determination module 205 is used to adjust the current specification parameters of the battery pack according to the physical test results, and determine the target specification parameters of the battery pack that meet the second preset test conditions.

[0127] Furthermore, the model building module 201 includes:

[0128] An acquisition submodule is used to acquire initial specification parameters of the battery pack to be tested of the vehicle; wherein the initial specification parameters include anti-collision structure parameters, battery pack structure parameters and battery pack material parameters;

[0129] Creating a submodule, for creating a vehicle model and a battery pack model respectively according to the anti-collision structure parameters, the battery pack structure parameters and the battery pack material parameters;

[0130] The integration submodule is used to integrate the battery pack model into the whole vehicle model to obtain a battery pack bottom scraping simulation model.

[0131] Furthermore, the collision simulation module 202 includes:

[0132] A first determination submodule is used to determine a preset simulation condition; wherein the preset simulation condition includes a wall to be hit and a collision speed;

[0133] An adjustment submodule, used for adjusting the battery pack bottom scraping simulation model so that the connector port of the battery pack is directly opposite to the barrier to be hit, and the lowest point of the battery pack overlaps the barrier to be hit by a preset height;

[0134] The simulation submodule is used to perform a collision simulation by causing the battery pack bottom scraping simulation model to impact the barrier to be impacted at the impact speed, monitor the impact condition of the battery pack connector and the stress condition of the battery pack components, and obtain the collision simulation result of the battery pack.

[0135] Furthermore, the first parameter determination module 203 includes:

[0136] A simulation judgment submodule, used to judge whether the initial specification parameters of the battery pack meet a first preset test condition according to the collision simulation result of the battery pack;

[0137] A testing submodule, for determining that if the stress of the battery pack connector and components is less than the allowable stress, the initial specification parameters of the battery pack meet a first preset test condition;

[0138] The parameter processing submodule is used to adjust the initial specification parameters of the battery pack and freeze the current specification parameters of the battery pack that meet the first preset test condition.

[0139] Furthermore, the parameter processing submodule includes:

[0140] a parameter adjustment unit, configured to adjust at least one of an anti-collision structure parameter, a battery pack structure parameter, and a battery pack material parameter in the initial specification parameters if the initial specification parameters of the battery pack do not meet the first preset test condition;

[0141] The parameter freezing unit is used to freeze the current specification parameter when the adjusted current specification parameter meets the first preset test condition.

[0142] Furthermore, the physical testing module 204 includes:

[0143] A second determination submodule is used to create a physical test condition according to the current specification parameters of the battery pack and the preset simulation condition;

[0144] A physical test submodule, used for performing a physical test on the battery pack under the physical test conditions; the physical test includes a collision test and a safety test;

[0145] The third determining submodule is used to determine the test results of the collision test and the safety test as the physical test results of the battery pack.

[0146] Furthermore, the second parameter determination module 205 includes:

[0147] A measurement judgment submodule, used to judge whether the current specification parameters of the battery pack meet the second preset test condition according to the physical test result;

[0148] The parameter determination submodule is used to determine that the current specification parameters of the battery pack are target specification parameters if the current specification parameters of the battery pack meet the second preset test conditions.

[0149] The battery pack collision test device provided by the embodiment of the present invention obtains the initial specification parameters of the battery pack to be tested of the vehicle, constructs a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack, performs collision simulation on the battery pack bottom scraping simulation model using preset simulation conditions, obtains the collision simulation result of the battery pack, adjusts the initial specification parameters of the battery pack, freezes the current specification parameters of the battery pack when the impact and force conditions of the battery pack meet the first preset test conditions, performs a physical test on the battery pack according to the current specification parameters of the battery pack, obtains the physical test result of the battery pack, adjusts the current specification parameters of the battery pack according to the physical test result, and determines the target specification parameters of the battery pack that meet the second preset test conditions. The embodiment of the present invention constructs a battery pack bottom scraping simulation model for simulation and physical testing, comprehensively analyzes the stress conditions of the connectors and components of the battery pack, verifies the accuracy of the simulation results in combination with physical tests, optimizes the structural layout and material parameters, and achieves that both simulation and actual measurement meet the requirements. The optimized battery pack specification parameters can effectively avoid excessive stress of connectors and components, and ensure the safety performance of the battery pack under the condition of bottom scraping. Through the analysis method that combines simulation with actual measurement, we avoid hitting weak locations such as the connectors at the end of the battery pack, and ensure that the stress or strain of the bottom components and cells does not exceed the allowable stress or strain, thereby improving the safety and reliability of the battery pack and achieving the goal of improving development progress, development quality and reducing development costs.

[0150] Reference Fig.14 , an embodiment of the present invention further provides an electronic device, such as Fig.14 As shown, it includes a processor 301, a communication interface 302, a memory 303 and a communication bus 304, wherein the processor 301, the communication interface 302, and the memory 303 communicate with each other through the communication bus 304.

[0151] A processor 301, a memory 303 for storing processor executable instructions;

[0152] The processor 301 is configured to execute the instructions to implement the battery pack collision test method as described above:

[0153] Obtain the initial specification parameters of the battery pack to be tested in the vehicle, and build a battery pack bottom scraping simulation model based on the initial specification parameters of the battery pack;

[0154] Using a preset simulation condition to perform a collision simulation on the battery pack bottom scraping simulation model to obtain a collision simulation result of the battery pack; wherein the collision simulation result includes the impact condition of the battery pack connector and the stress condition of the battery pack components;

[0155] Adjusting the initial specification parameters of the battery pack, and freezing the current specification parameters of the battery pack when the impact condition and the force condition of the battery pack meet the first preset test condition;

[0156] Performing a physical test on the battery pack according to current specification parameters of the battery pack to obtain a physical test result of the battery pack;

[0157] The current specification parameters of the battery pack are adjusted according to the physical test results to determine the target specification parameters of the battery pack that meet the second preset test conditions.

[0158] The communication bus mentioned in the above terminal can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0159] The communication interface is used for communication between the above terminal and other devices.

[0160] The memory may include a random access memory (RAM) or a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0161] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0162] In another embodiment provided by the present invention, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, the battery pack collision test method described in any of the above embodiments is implemented.

[0163] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk Solid State Disk (SSD)), etc.

[0164] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0165] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0166] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A battery pack collision test method, characterized in that: The method comprises: Obtain the initial specification parameters of the battery pack to be tested in the vehicle, and build a battery pack bottom scraping simulation model based on the initial specification parameters of the battery pack; Using a preset simulation condition to perform a collision simulation on the battery pack bottom scraping simulation model to obtain a collision simulation result of the battery pack; wherein the collision simulation result includes the impact condition of the battery pack connector and the stress condition of the battery pack components; Adjusting the initial specification parameters of the battery pack, and freezing the current specification parameters of the battery pack when the impact condition and the force condition of the battery pack meet the first preset test condition; Performing a physical test on the battery pack according to current specification parameters of the battery pack to obtain a physical test result of the battery pack; The current specification parameters of the battery pack are adjusted according to the physical test results to determine the target specification parameters of the battery pack that meet the second preset test conditions.

2. The method according to claim 1, characterized in that The obtaining of initial specification parameters of the battery pack to be tested of the vehicle and constructing a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack includes: Obtaining initial specification parameters of the battery pack to be tested of the vehicle; wherein the initial specification parameters include anti-collision structure parameters, battery pack structure parameters, and battery pack material parameters; Create a whole vehicle model and a battery pack model respectively according to the anti-collision structure parameters, battery pack structure parameters and battery pack material parameters; The battery pack model is integrated into the whole vehicle model to obtain a battery pack bottom scraping simulation model.

3. The method according to claim 1, characterized in that The method of performing collision simulation on the battery pack bottom scraping simulation model using a preset simulation condition to obtain a collision simulation result of the battery pack includes: Determine a preset simulation working condition; wherein the preset simulation working condition includes a wall to be hit and a collision speed; The battery pack bottom scraping simulation model is adjusted so that the connector port of the battery pack is directly opposite to the barrier to be hit, and the lowest point of the battery pack overlaps the barrier to be hit by a preset height; The battery pack bottom scraping simulation model is caused to impact the barrier to be impacted at the impact speed to perform a collision simulation, the impact condition of the battery pack connector and the stress condition of the battery pack components are monitored, and the collision simulation result of the battery pack is obtained.

4. The method according to claim 1, characterized in that: The adjusting the initial specification parameters of the battery pack, and freezing the current specification parameters of the battery pack when the impact condition and the force condition of the battery pack meet the first preset test condition, includes: According to the collision simulation result of the battery pack, determining whether the initial specification parameters of the battery pack meet a first preset test condition; If the stress of the battery pack connector and components is less than the allowable stress, the initial specification parameters of the battery pack meet the first preset test condition; Otherwise, the initial specification parameters of the battery pack are adjusted, and the current specification parameters of the battery pack that meet the first preset test condition are frozen.

5. The method according to claim 4, characterized in that Otherwise, adjusting the initial specification parameters of the battery pack to freeze the current specification parameters of the battery pack that meet the first preset test condition includes: If the initial specification parameters of the battery pack do not meet the first preset test condition, adjusting at least one of the anti-collision structure parameters, the battery pack structure parameters, and the battery pack material parameters in the initial specification parameters; When the adjusted current specification parameters meet the first preset test condition, the current specification parameters are frozen.

6. The method according to claim 1, characterized in that The performing a physical test on the battery pack according to the current specification parameters of the battery pack to obtain a physical test result of the battery pack includes: Creating a physical test condition according to the current specification parameters of the battery pack and the preset simulation condition; Performing a physical test on the battery pack under the physical test conditions; the physical test includes a collision test and a safety test; The test results of the collision test and the safety test are determined as the physical test results of the battery pack.

7. The method according to claim 1, characterized in that The step of adjusting the current specification parameters of the battery pack according to the physical test result to determine the target specification parameters of the battery pack that meet the second preset test condition includes: According to the physical test result, determining whether the current specification parameters of the battery pack meet a second preset test condition; If the current specification parameters of the battery pack meet the second preset test condition, the current specification parameters of the battery pack are determined to be target specification parameters.

8. A battery pack collision test device, characterized in that: The device comprises: A model building module is used to obtain the initial specification parameters of the battery pack to be tested in the vehicle, and to build a battery pack bottom scraping simulation model according to the initial specification parameters of the battery pack; A collision simulation module, used to perform collision simulation on the battery pack bottom scraping simulation model using preset simulation conditions to obtain collision simulation results of the battery pack; wherein the collision simulation results include the impact conditions of the battery pack connector and the stress conditions of the battery pack components; a first parameter determination module, configured to adjust initial specification parameters of the battery pack, and freeze current specification parameters of the battery pack when the impact condition and force condition of the battery pack meet a first preset test condition; A physical testing module, used to perform a physical test on the battery pack according to current specification parameters of the battery pack to obtain a physical test result of the battery pack; The second parameter determination module is used to adjust the current specification parameters of the battery pack according to the physical test results to determine the target specification parameters of the battery pack that meet the second preset test conditions.

9. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to execute the instructions to implement the battery pack collision test method as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed by a processor, the battery pack collision test method according to any one of claims 1 to 7 is implemented.

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