A battery system structure safety protection test method, equipment and medium

Abstract

The present application discloses a battery system structural safety protection test method, equipment and medium, which relates to the field of battery testing. The method includes: performing a first scenario test to obtain a first test result; performing a second scenario test to obtain a second test result; performing a third scenario test to obtain a third test result; performing a fourth scenario test to obtain a fourth test result; the first scenario test, the second scenario test, the third scenario test and the fourth scenario test are respectively impacting the battery system in the first direction, the second direction, the third direction and the fourth direction; the first direction, the second direction and the third direction are respectively the X-axis direction, the Y-axis direction and the Z-axis direction with the battery system as the origin, and the fourth direction is determined according to any two directions of the first direction, the second direction and the third direction; the four test results are weighted to obtain the final test result. The present application can obtain more accurate and realistic battery system protection performance test results.

Description

Technical Field

[0001] The present application relates to the field of battery testing, and in particular to a battery system structure safety protection testing method, equipment and medium. Background Art

[0002] With the rapid development of new energy technologies, the demand for batteries in energy storage, automobiles and other fields is becoming increasingly urgent. In order to meet the relevant R&D and testing needs, it is necessary to develop corresponding test systems.

[0003] In the prior art, the test schemes for the protection performance of the battery system mostly use a single direction, such as X-direction extrusion and Y-direction extrusion. In complex real collision scenarios, the battery system is usually subjected to impacts and collisions in multiple directions, and even in a collision in a certain direction, it will be subjected to forces in multiple directions at the same time. Therefore, the existing test schemes for the protection performance of the battery system cannot truly reflect the actual collision scenario, and the test results are not accurate. Summary of the invention

[0004] The purpose of this application is to provide a battery system structural safety protection test method, equipment and medium, which can obtain more accurate and realistic battery system protection performance test results.

[0005] To achieve the above objectives, this application provides the following solutions.

[0006] In a first aspect, the present application provides a battery system structure safety protection test method, comprising:

[0007] Perform a first scenario test to obtain a first test result; perform a second scenario test to obtain a second test result; perform a third scenario test to obtain a third test result; perform a fourth scenario test to obtain a fourth test result;

[0008] Among them, the first scenario test, the second scenario test, the third scenario test, and the fourth scenario test are respectively to impact the battery system in the first direction, the second direction, the third direction, and the fourth direction; the first direction, the second direction, and the third direction are respectively the X-axis direction, the Y-axis direction, and the Z-axis direction with the battery system as the origin, and the fourth direction is determined according to any two directions of the first direction, the second direction, and the third direction;

[0009] The first test result, the second test result, the third test result and the fourth test result are weighted to obtain a final test result.

[0010] In a second aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the battery system structure safety protection test method.

[0011] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the battery system structure safety protection test method.

[0012] According to the specific embodiments provided by this application, this application discloses the following technical effects: This application provides a battery system structural safety protection test method, equipment and medium, based on the actual vehicle scene working conditions, simulating the collision risk scenarios of the battery system from four different impact directions during the driving of new energy vehicles on the road, and the situation of damage to the battery system, setting up four scenarios for testing, thereby realizing the impact test for four different directions and obtaining four test results. Then the four test results are weighted to obtain a more accurate and realistic final test result to characterize the impact resistance performance of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is an application environment diagram of a battery system structure safety protection test method in one embodiment of the present application.

[0015] Figure 2 A flowchart of a battery system structure safety protection test method provided in one embodiment of the present application.

[0016] Figure 3 A schematic diagram of the relative positions of a test platform, obstacles, and a battery system provided in one embodiment of the present application.

[0017] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] This application selects 4 different scenarios for dynamic safety testing of battery system protection. Each scenario can be tested multiple times, so that the protection safety performance of the battery system can be examined from multiple dimensions. In one example, the test scenarios include: a scenario of structural protection safety testing of the battery system from three directions, XYZ, and an N-direction composite test condition scenario that includes both the X and Z directions. The testing of the above four scenarios can provide a deeper understanding of the true safety performance of the battery system in a complex vehicle use environment. It should be noted that a structural protection test of the battery system from a single direction cannot reflect its safety capability index against complex road impacts.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] The battery system structure safety protection test method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. The terminal 102 can send relevant instructions for the all-round safety protection performance test of the battery system to the server 104. After receiving the instructions, the server 104 sends at least four scenario test instructions to the corresponding hardware structure, and then receives the corresponding test results; after weighting the four test results, the final test result is obtained. The server 104 can feedback the final test result to the terminal 102.

[0022] The terminal 102 may be, but is not limited to, various desktop computers, laptop computers, tablet computers, IoT devices, and portable wearable devices. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers, or may be a cloud server.

[0023] In an exemplary embodiment, Figure 2As shown, a battery system structure safety protection test method is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In the embodiment of the present application, the method is applied to Figure 1 The server 104 in the example is used for explanation, and the steps include the following steps 201 to 202.

[0024] Step 201, execute the first scenario test to obtain the first test result; execute the second scenario test to obtain the second test result; execute the third scenario test to obtain the third test result; execute the fourth scenario test to obtain the fourth test result.

[0025] Among them, the first scenario test, the second scenario test, the third scenario test, and the fourth scenario test are respectively to impact the battery system in the first direction, the second direction, the third direction, and the fourth direction; the first direction, the second direction, and the third direction are respectively the X-axis direction, the Y-axis direction, and the Z-axis direction with the battery system as the origin, and the fourth direction is determined based on any two directions of the first direction, the second direction, and the third direction.

[0026] In practical applications, four test scenarios need to be determined for each battery system to be tested, and each test scenario can be tested multiple times. For the test scenario corresponding to the fourth direction, different fourth directions can be selected for multiple tests; then the results obtained from the multiple tests are weighted to obtain the final fourth test result.

[0027] The first scenario test is as follows.

[0028] First, set the relevant data parameters in the scene: the scene includes obstacles, and the contact end between the obstacle and the battery system (or battery pack) is the top of a 150mm (±1mm) diameter cylinder with a chamfer R=50mm (±1mm), made of #45 steel. In this scene, the impact direction of the battery system is the positive direction of the X axis. In general, the direction of the car's travel is the X axis, and the other horizontal direction perpendicular to the travel direction is the Y axis.

[0029] According to the structural layout of the battery system, there are two optional impact positions, one is the point with the greatest risk of forward impact of the battery system provided by the manufacturer; the other is the 1 / 4 position of the front end of the battery system. Choose one of them as the impact position for subsequent impacts. Then, set the impact speed to V=20km / h (±1km / h). The impact overlap is the overlap H=20mm (-0mm / +6mm) along the Z direction between the highest point on the top of the obstacle and the lowest point on the bottom of the battery system under the vehicle mass counterweight.

[0030] Finally, after completing the impact according to the above conditions, observe for 2 hours at the test environment temperature, and then obtain the corresponding first test result.

[0031] The second scenario test is as follows.

[0032] First, set the relevant data parameters in the scene: no obstacles are set in the scene, but an impact head is used instead. The impact head is made of steel, and the contact end between the impact head and the battery system is a semi-cylindrical shape with a diameter of 130mm. In this scene, the impact direction of the battery system is the positive direction of the Y axis.

[0033] One of the two optional impact positions recorded in the first scenario test above is selected as the impact position for the subsequent impact. Then, the impact speed is set to 15 km / h and the impact mass is set to 2000 kg.

[0034] Finally, after completing the impact according to the above conditions, observe for 2 hours at the test environment temperature, and then obtain the corresponding second test result.

[0035] The third scenario test is as follows.

[0036] First, set the relevant data parameters in the scene: no obstacles are set in the scene, and an impact head is used. The impact head is made of steel, and the contact end between the impact head and the battery system is a hemispherical shape with a diameter of 30mm. In this scene, the impact direction of the battery system is the positive direction of the Z axis.

[0037] According to the structural layout of the battery system, three bottom protection risk points of the battery system were selected as the impact positions (covering the front, middle and rear of the battery). Then the impact energy was set to 150J.

[0038] Finally, after completing the impact test according to the above conditions, observe for 2 hours at the test environment temperature, and then obtain the corresponding third test result. In addition, when the battery system is impact tested, the body structure that protects the battery pack or system is allowed to participate in the test.

[0039] The fourth scenario test is as follows.

[0040] Executing a fourth scenario test to obtain a fourth test result specifically includes: determining a fourth direction, and determining a scenario test component based on the fourth direction; and performing a fourth direction impact test on the battery system based on the scenario test component to obtain a fourth test result. Specifically, the fourth scenario test is a composite impact scenario, in which the fourth direction is obtained by vector superposition of any two of the first direction, the second direction, and the third direction. In practical applications, the first direction and the second direction are generally selected for determination.

[0041] The scenario test component includes a test platform and an obstacle; the obstacle is set on the test platform; the setting angle and surface shape of the obstacle correspond to the fourth direction, so that when the battery system moves to the position of the obstacle, the battery system and the obstacle overlap; the test platform has a slope, and the slope is used to simulate potholes on the road. The slope of the test platform ranges from 0° to 5°. Figure 3 As shown, it is a schematic diagram of the relative positions of the test platform, obstacles and battery system.

[0042] In another practical application, the test platform includes an uphill section, a straight section, and a downhill section arranged in sequence. Figure 3 The position of the obstacle shown in is on the downhill section.

[0043] In an actual test process, the contact end between the obstacle and the battery system is a spherical top with R=75mm (±1mm), made of #45 steel. The height of the obstacle is such that there is a certain amount of overlap between its top and the bottom of the battery pack in the direction perpendicular to the ground. The impact direction is still the positive direction of the X-axis, because the test platform has a slope, so even if the impact is carried out in the positive direction of the X-axis, it will not affect the angle of the battery system being impacted, and by adjusting the relative position of the preset obstacle and the running platform such as steps, the obstacle hits the weakest position of the battery pack.

[0044] According to the structural layout of the battery system, there are two optional impact positions, one is the point with the greatest risk of forward impact of the battery system provided by the manufacturer; the other is the 1 / 4 position of the front end of the battery system. Choose one of them as the impact position for subsequent impacts. Then, set the impact speed to V=20km / h (±1km / h). The impact overlap is the overlap H=20mm (-0mm / +6mm) along the Z direction between the highest point on the top of the obstacle and the lowest point on the bottom of the battery system under the vehicle mass counterweight.

[0045] According to the above conditions, the vehicle body structure including the battery system is driven down from a platform such as a right-angle step of a certain height of a curbstone at a set speed, so that the battery system collides with the obstacle, thus completing the impact. Then observe for 2 hours at the test environment temperature, and then obtain the corresponding fourth test result.

[0046] Step 202: weighting the first test result, the second test result, the third test result and the fourth test result to obtain a final test result.

[0047] In an application example, the first test result, the second test result, the third test result, and the fourth test result all include three levels.

[0048] Among them, the first level is represented by A=100; the first level indicates that after the battery system is impacted, the insulation of the battery system meets the first preset condition, and the airtightness of the battery system meets the second preset condition. The second level is represented by B=80; the second level indicates that after the battery system is impacted, the insulation of the battery system does not meet the first preset condition, or the airtightness of the battery system does not meet the second preset condition. The third level is represented by C=60; the third level indicates that after the battery system is impacted, the insulation of the battery system does not meet the first preset condition, and the airtightness of the battery system does not meet the second preset condition.

[0049] In order to be practical, the following preset conditions are set in this application: the first preset condition is that the insulation strength of the battery system is not less than the preset insulation strength value; the preset insulation strength value ranges from 100Ω / V to 500Ω / V; the second preset condition is that the gas leakage of the battery system is less than the preset leakage value; the preset leakage value ranges from 0Pa / min to 100Pa / min. In different tests, the above preset conditions can be adaptively changed.

[0050] In another application example, step 202 specifically includes the following four steps.

[0051] (1) Obtain a historical damaged battery system data set within a preset time period. In practical applications, the model of the battery system in the historical damaged battery system data set obtained is consistent with the model of the battery system to be tested. The more conventional determination method is to determine it based on the production company.

[0052] (2) Determine, based on the historical damaged battery system data set, the number of battery systems damaged in a first direction, the number of battery systems damaged in a second direction, the number of battery systems damaged in a third direction, and the number of battery systems damaged in a fourth direction.

[0053] (3) Based on the number of damaged battery systems in the first direction, the number of damaged battery systems in the second direction, the number of damaged battery systems in the third direction, and the number of damaged battery systems in the fourth direction, determine a first direction weight coefficient, a second direction weight coefficient, a third direction weight coefficient, and a fourth direction weight coefficient. Specifically, the corresponding weight coefficients may be determined according to the ratio of the number of damaged battery systems in different directions.

[0054] In addition, generally speaking, the weight coefficients corresponding to different production companies or different preset durations are different.

[0055] (4) Based on the first direction weight coefficient, the second direction weight coefficient, the third direction weight coefficient and the fourth direction weight coefficient, weighted calculation is performed on the first test result, the second test result, the third test result and the fourth test result to obtain a final test result.

[0056] In a specific application example, as shown in Table 1 below, the first scenario test is performed with item X as the representation, the second scenario test is performed with item Y as the representation, the third scenario test is performed with item Z as the representation, and the fourth scenario test is performed with item N as the representation. The weight coefficients determined based on (1) to (3) above are: the weight coefficient of the first direction is 60%, the weight coefficient of the second direction is 30%, the weight coefficient of the third direction is 7%, and the weight coefficient of the fourth direction is 3%. The final test result is calculated using the weighting formula S=S1×K1+S2×K2+S3×K3+S4×K4.

[0057] Table 1

[0058]

[0059] It should be noted that the four directional weight coefficients K1, K2, K3, and K4 fully consider the probability and difficulty of the battery system being hit during the actual collision of the vehicle. Finally, threshold matching can also be performed based on the final test results obtained in Table 1 above to obtain the corresponding performance of the battery system.

[0060] In summary, this application provides a feasible solution for the dynamic safety evaluation of the bottom of the electric vehicle power battery pack, which has a positive role in promoting the green and healthy development of new energy.

[0061] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery system structure safety protection test method is implemented.

[0062] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0063] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0064] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0065] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0066] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0067] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A battery system structure safety protection test method, characterized in that: The battery system structure safety protection test method includes: Perform a first scenario test to obtain a first test result; perform a second scenario test to obtain a second test result; perform a third scenario test to obtain a third test result; perform a fourth scenario test to obtain a fourth test result; Executing a fourth scenario test to obtain a fourth test result specifically includes: determining a fourth direction, and determining a scenario test component based on the fourth direction; performing a fourth direction impact test on the battery system based on the scenario test component to obtain a fourth test result; wherein the scenario test component includes a test platform and an obstacle; the obstacle is arranged on the test platform; the setting angle and surface shape of the obstacle correspond to the fourth direction, so that when the battery system moves to the position of the obstacle, the battery system overlaps with the obstacle; the test platform has a slope, and the slope is used to simulate potholes on the road; Among them, the first scenario test, the second scenario test, the third scenario test, and the fourth scenario test are respectively to impact the battery system in the first direction, the second direction, the third direction, and the fourth direction; the first direction, the second direction, and the third direction are respectively the X-axis direction, the Y-axis direction, and the Z-axis direction with the battery system as the origin, and the fourth direction is determined according to any two directions of the first direction, the second direction, and the third direction; The first test result, the second test result, the third test result and the fourth test result are weighted to obtain a final test result; wherein the weight coefficient in the first direction is 60%, the weight coefficient in the second direction is 30%, the weight coefficient in the third direction is 7%, and the weight coefficient in the fourth direction is 3%.

2. The battery system structure safety protection test method according to claim 1, characterized in that: The first test result, the second test result, the third test result, and the fourth test result are weighted to obtain a final test result, specifically including: Obtain a historical damaged battery system dataset within a preset time period; Determine, according to the historical damaged battery system data set, the number of battery systems damaged in a first direction, the number of battery systems damaged in a second direction, the number of battery systems damaged in a third direction, and the number of battery systems damaged in a fourth direction; Determine a first direction weight coefficient, a second direction weight coefficient, a third direction weight coefficient, and a fourth direction weight coefficient based on the number of damaged battery systems in the first direction, the number of damaged battery systems in the second direction, the number of damaged battery systems in the third direction, and the number of damaged battery systems in the fourth direction; Based on the first direction weight coefficient, the second direction weight coefficient, the third direction weight coefficient and the fourth direction weight coefficient, the first test result, the second test result, the third test result and the fourth test result are weightedly calculated to obtain a final test result.

3. The battery system structure safety protection test method according to claim 1, characterized in that: The first test result, the second test result, the third test result and the fourth test result all include three levels; The first level indicates that after the battery system is impacted, the insulation of the battery system meets the first preset condition, and the airtightness of the battery system meets the second preset condition; The second level indicates that after the battery system is impacted, the insulation of the battery system does not meet the first preset condition, or the airtightness of the battery system does not meet the second preset condition; The third level indicates that after the battery system is impacted, the insulation of the battery system does not meet the first preset condition, and the airtightness of the battery system does not meet the second preset condition.

4. The battery system structure safety protection test method according to claim 3, characterized in that: The first preset condition is that the insulation strength of the battery system is not lower than the preset insulation strength value; the range of the preset insulation strength value is 100Ω / V-500Ω / V; the second preset condition is that the gas leakage of the battery system is less than the preset leakage value; the range of the preset leakage value is 0Pa / min-100Pa / min.

5. The battery system structure safety protection test method according to claim 1, characterized in that: The slope of the test platform ranges from 0° to 5°.

6. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the battery system structure safety protection test method according to any one of claims 1 to 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the battery system structure safety protection test method described in any one of claims 1 to 5 is implemented.

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