Battery structure thermal runaway test method, system, device, equipment and medium

Abstract

The invention relates to a battery structure thermal runaway test method, system, device and equipment and a medium, and the method comprises the steps: controlling a triggering part corresponding to a target working condition, and carrying out the thermal runaway triggering operation of a target cell in a target region corresponding to the target working condition; wherein the target areas corresponding to different target working conditions in the battery structure are at least partially different, and the target cells corresponding to the target areas under different target working conditions are at least partially different; respectively acquiring thermal runaway parameters of the target battery cell and a battery cell adjacent to the target battery cell through the sensor; and generating a test result corresponding to the battery structure according to the thermal runaway parameter. According to the invention, the analysis accuracy of the diffusion condition when the battery is in thermal runaway can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power batteries, and particularly relates to a battery structure thermal runaway test method, system and device, electronic equipment and a computer readable storage medium. BACKGROUND

[0002] With the development of new energy vehicles, the safety of power batteries is also increasingly concerned, and the thermal runaway risk of power batteries is also being continuously researched.

[0003] In the related art, the thermal diffusion of a battery pack after a single battery experiences thermal runaway is studied, but the analysis of the diffusion of a single battery experiencing thermal runaway is not accurate and comprehensive enough for vehicle safety. SUMMARY

[0004] To solve the above technical problems, the present disclosure provides a battery structure thermal runaway test method, system, device, electronic equipment and a computer readable storage medium.

[0005] In a first aspect, the present disclosure provides a battery structure thermal runaway test method,

[0006] The battery structure is arranged in a detection box, the battery structure includes a plurality of battery cells, and at least part of the battery cells are provided with corresponding sensors; the detection box is provided with a trigger for the plurality of battery cells; and the method comprises the following steps:

[0007] controlling the trigger corresponding to a target working condition to perform a thermal runaway triggering operation on a target battery cell in a target area corresponding to the target working condition; wherein the target areas corresponding to different target working conditions in the battery structure are at least partially different, and the target battery cells corresponding to the target areas in different target working conditions are at least partially different;

[0008] acquiring thermal runaway parameters of the target battery cell and an adjacent battery cell of the target battery cell through the sensors respectively;

[0009] generating a test result corresponding to the battery structure according to the thermal runaway parameters.

[0010] Optionally, each trigger corresponds to a different battery cell.

[0011] The step of controlling the trigger corresponding to a target working condition to perform a thermal runaway triggering operation on a target battery cell in a target area corresponding to the target working condition comprises the following steps:

[0012] determining the target area corresponding to the target working condition, and determining the battery cell in the target area as the target battery cell;

[0013] The target working condition corresponds to each trigger piece, and each trigger piece corresponds to a target battery cell for thermal runaway triggering operation.

[0014] Optionally, the step of acquiring the thermal runaway parameters of the target battery cell and the adjacent battery cell of the target battery cell through the sensor respectively comprises:

[0015] When the number of battery cells between the target battery cell and the adjacent battery cell is zero, the battery cell is determined as the adjacent battery cell of the target battery cell; each target battery cell corresponds to at least one adjacent battery cell;

[0016] The thermal runaway parameters of the target battery cell and the adjacent battery cell are acquired through the sensor respectively.

[0017] Optionally, when the target working condition is a bottom scraping working condition, the target working condition corresponds to a first region or a second region; the first region and the second region are middle regions of the two ends of the vehicle axial direction corresponding to the battery structure;

[0018] When the target working condition corresponds to the first region, the target battery cell is N battery cells continuously from the first region to the second region; N is a natural number greater than or equal to 2;

[0019] When the target working condition corresponds to the second region, the target battery cell is N battery cells continuously from the second region to the first region;

[0020] The thermal runaway triggering operation is a needle operation on the battery cell.

[0021] Optionally, when the target working condition is a collision working condition, the target working condition corresponds to at least one of a first region, a second region, a third region, and a fourth region; the first region and the second region are middle regions of the two ends of the vehicle axial direction corresponding to the battery structure; the third region and the fourth region are middle regions of the vehicle transverse direction corresponding to the battery structure.

[0022] The thermal runaway triggering operation is a needle operation on the battery cell.

[0023] Optionally, when the target working condition is a battery natural working condition, the target working condition corresponds to a fifth region, and the fifth region is a center region where the plurality of battery cells are distributed.

[0024] The thermal runaway triggering operation is a heating operation of the built-in heating module of the target battery cell.

[0025] Optionally, in the case that the target working condition is an external fire burning working condition, the target working condition corresponds to a third region and a fourth region, and the third region and the fourth region are middle regions of the battery structure corresponding to a transverse direction of a vehicle.

[0026] The thermal runaway triggering operation is a heating operation of an external heating module located outside the battery structure and close to the target battery cell.

[0027] Optionally, the generating of the test result corresponding to the battery structure according to the thermal runaway parameter includes:

[0028] According to the thermal runaway parameters of the target battery cell and the adjacent battery cell, a thermal runaway parameter curve corresponding to the target battery cell and the adjacent battery cell is respectively generated.

[0029] Based on the thermal runaway parameter curve, the thermal safety performance of the battery structure is determined.

[0030] In a second aspect, the embodiments of the present disclosure provide a battery structure thermal runaway test method, and the method includes:

[0031] A target working condition is determined; different target working conditions correspond to different target regions in a simulation model, and target battery cells in the target regions in different target working conditions are different; the simulation model is generated based on a battery structure, the battery structure includes a plurality of battery cells, and the plurality of battery cells include a target battery cell and adjacent battery cells around the target battery cell.

[0032] A thermal runaway triggering operation is performed on a target battery cell in a target region corresponding to the target working condition.

[0033] Based on the simulation model, battery cell thermal physical parameters, and temperature-preset parameter relationships of the battery cells, a battery cell thermal diffusion process is simulated; the preset parameters include a heat generation rate and / or an exhaust volume.

[0034] Thermal runaway parameters of the target battery cell and the adjacent battery cells in the thermal diffusion process are respectively obtained.

[0035] According to the thermal runaway parameters, a test result corresponding to the battery structure is generated.

[0036] In a third aspect, the embodiments of the present disclosure provide a battery structure thermal runaway test system, a battery structure is arranged in a detection box, the battery structure includes a plurality of battery cells, and at least part of the battery cells are provided with corresponding sensors; the detection box is provided with a triggering member for the plurality of battery cells; and the system includes:

[0037] A control module is configured to control a trigger corresponding to a target working condition to perform a thermal runaway triggering operation on a target battery cell in a target region corresponding to the target working condition; wherein target regions corresponding to different target working conditions in the battery structure are at least partially different, and target battery cells corresponding to the target regions in different target working conditions are at least partially different;

[0038] A runaway parameter acquisition module is configured to acquire thermal runaway parameters of the target battery cell and an adjacent battery cell of the target battery cell through the sensor respectively;

[0039] A performance analysis module is configured to generate a test result corresponding to the battery structure according to the thermal runaway parameters.

[0040] Optionally, each trigger corresponds to a different battery cell;

[0041] The control module comprises:

[0042] A target battery cell submodule is configured to determine a target region corresponding to the target working condition, and determine a battery cell in the target region as a target battery cell

[0043] A target triggering submodule is configured to control each trigger corresponding to the target working condition to perform a thermal runaway triggering operation on a target battery cell corresponding to each trigger.

[0044] Optionally, the runaway parameter acquisition module comprises:

[0045] An adjacent battery cell submodule is configured to determine a battery cell as an adjacent battery cell of the target battery cell when the number of battery cells between the battery cell and the target battery cell is zero; each target battery cell corresponds to at least one adjacent battery cell;

[0046] A parameter acquisition submodule is configured to acquire thermal runaway parameters of the target battery cell and the adjacent battery cell through the sensor respectively.

[0047] Optionally, when the target working condition is a bottom scraping working condition, the target region corresponding to the target working condition is a first region or a second region; the first region and the second region are middle regions of two ends of an axial direction of a vehicle corresponding to the battery structure;

[0048] When the target working condition corresponds to the first region, the target battery cell is N battery cells continuously from the first region to the second region; N is a natural number greater than or equal to 2;

[0049] When the target working condition corresponds to the second region, the target battery cell is N battery cells continuously from the second region to the first region;

[0050] The thermal runaway triggering operation is a needling operation on the battery cell.

[0051] Optionally, in the case where the target working condition is a collision working condition, the target working condition corresponds to at least one of a first region, a second region, a third region, and a fourth region; the first region and the second region are middle regions of two ends of the battery structure in the vehicle axial direction; and the third region and the fourth region are middle regions of the battery structure in the vehicle transverse direction.

[0052] The thermal runaway triggering operation is a needling operation on the electric core.

[0053] Optionally, in the case where the target working condition is a battery natural working condition, the target working condition corresponds to a fifth region, and the fifth region is a central region of the distribution of the plurality of electric cores.

[0054] The thermal runaway triggering operation is a heating operation of a built-in heating module of the target electric core.

[0055] Optionally, in the case where the target working condition is an external fire working condition, the target working condition corresponds to the third region and the fourth region, and the third region and the fourth region are middle regions of the battery structure in the vehicle transverse direction.

[0056] The thermal runaway triggering operation is a heating operation of an external heating module close to the target electric core outside the battery structure.

[0057] Optionally, the performance analysis module is further configured to: generate a thermal runaway parameter curve corresponding to the target electric core and the adjacent electric core, respectively, according to the thermal runaway parameters of the target electric core and the adjacent electric core; and determine the thermal safety performance of the battery structure based on the thermal runaway parameter curves.

[0058] In a fourth aspect, the embodiments of the present disclosure provide a battery structure thermal runaway testing device, which comprises:

[0059] A working condition determination module is configured to determine a target working condition for testing; different target working conditions correspond to different target regions in a simulation model, and target electric cores in the target regions in different target working conditions are different at least in part; the simulation model is generated based on a battery structure, the battery structure comprises a plurality of electric cores, and the plurality of electric cores comprise a target electric core and adjacent electric cores around the target electric core.

[0060] A triggering module is configured to perform a thermal runaway triggering operation on a target electric core in a target region corresponding to the target working condition.

[0061] An analog diffusion module is configured to simulate an electric core heat diffusion process based on the simulation model, electric core thermal physical parameters, and a temperature-preset parameter relationship of the electric core; the preset parameter comprises a heat generation rate and / or an exhaust volume.

[0062] an out-of-control parameter acquisition module configured to acquire thermal runaway parameters of the target battery cell and the adjacent battery cell in the thermal diffusion process, respectively;

[0063] a performance analysis module configured to generate a test result corresponding to the battery structure according to the thermal runaway parameters.

[0064] In a fifth aspect, an electronic device is provided, including:

[0065] a memory;

[0066] a processor; and

[0067] a computer program;

[0068] The computer program is stored in the memory and configured to be executed by the processor to implement the method of the first aspect.

[0069] In a sixth aspect, a computer-readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the method of the first aspect.

[0070] In a seventh aspect, a computer program product is also provided. The computer program product includes a computer program or instructions, which, when executed by a processor, implement the battery structure thermal runaway test method as described above.

[0071] The battery structure thermal runaway test method provided by the embodiments of the present disclosure divides the layout of the battery structure into multiple regions according to the actual working condition requirements, and then controls the target region in the target working condition corresponding to the trigger piece to test the thermal runaway of the target battery cell in the target working condition during the test process, and analyzes the thermal runaway parameters of the target battery cell and the adjacent battery cells around the target battery cell based on the corresponding sensors. In this way, different working conditions can be simulated and tested flexibly, the state of the adjacent battery cells is observed after the target battery cell is triggered, and thus the safety of the battery structure can be tested. Moreover, since the regions and target battery cells that are suitable for the working conditions are selected for testing, the safety of the battery structure can be tested more comprehensively and accurately. BRIEF DESCRIPTION OF DRAWINGS

[0072] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the present disclosure.

[0073] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those drawings can also provide other drawings for those skilled in the art without creative labor.

[0074] Figure 1 A flow chart of a battery structure thermal runaway test method provided by the embodiments of the present disclosure is shown in the following.

[0075] Figure 2 A battery structure distribution schematic diagram provided by the embodiments of the present disclosure is shown in the following.

[0076] Figure 3 A target cell and surrounding cell distribution schematic diagram provided by the embodiments of the present disclosure is shown in the following.

[0077] Figure 4 A test result schematic diagram provided by the embodiments of the present disclosure is shown in the following.

[0078] Figure 5 Another test result schematic diagram provided by the embodiments of the present disclosure is shown in the following.

[0079] Figure 6 Another flow chart of a battery structure thermal runaway test method provided by the embodiments of the present disclosure is shown in the following.

[0080] Figure 7 An interaction schematic diagram of working condition information provided by the embodiments of the present disclosure is shown in the following.

[0081] Figure 8 A structural schematic diagram of a battery structure thermal runaway test device provided by the embodiments of the present disclosure is shown in the following.

[0082] Figure 9 A structural schematic diagram of an electronic device provided by the embodiments of the present disclosure is shown in the following. DETAILED DESCRIPTION

[0083] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present disclosure, the solutions of the present disclosure will be further described in the following. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0084] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, not all the embodiments.

[0085] The embodiments of the present disclosure provide a battery structure thermal runaway test method, which will be introduced in the following combined with specific embodiments.

[0086] Figure 1 A flow chart of a battery structure thermal runaway test method is provided in the embodiments of the present disclosure. The method can test the safety performance of the battery structure under various working conditions, and is more comprehensive and accurate.

[0087] The battery structure thermal runaway test method shown in the following will be introduced. Figure 1 The specific steps of the method are as follows:

[0088] 101. Control the trigger corresponding to the target working condition to perform a thermal runaway triggering operation on the target battery in the target area corresponding to the target working condition; wherein the target areas corresponding to different target working conditions in the battery structure are at least partially different, and the target batteries corresponding to the target areas under different target working conditions are at least partially different.

[0089] 102. Obtain the thermal runaway parameters of the target battery and the adjacent battery of the target battery through the sensor respectively;

[0090] 103. According to the thermal runaway parameters, generate a test result corresponding to the battery structure.

[0091] In the present disclosure, the battery structure can be arranged in a detection box, the battery structure includes a plurality of batteries, and at least part of the batteries are provided with corresponding sensors; the detection box is provided with a trigger for the plurality of batteries.

[0092] In the present disclosure, the battery structure can be a battery pack, a battery module and the like composed of a plurality of batteries, or a battery structure mounted on a vehicle.

[0093] Referring to Figure 2 , which shows a distribution diagram of a battery structure, the battery structure is provided with 8 columns of batteries, one column of batteries on the left and one column of batteries on the right, and each two columns of batteries in the middle are combined into a group, and there is a preset interval between the two groups, and there is a preset interval between the left column of batteries and the adjacent group of batteries, and there is a preset interval between the right column of batteries and the adjacent group of batteries, and the width of the preset interval can be set according to actual needs.

[0094] In the present disclosure, the trigger can include a needle and / or a heating element, and the corresponding trigger can be arranged at the corresponding position of the detection box according to the triggering mode required by the working condition.

[0095] In the present disclosure, if the thermal runaway triggering operation is the heating operation of the built-in heating module, the built-in heating module can be in close contact with the winding core of the battery cell. Different types of heating devices can be used for different types of battery cells, such as a thin film heating device for square cell and a rod-shaped heating device for cylindrical cell. The heating device can be a heating sheet, a heating coil or the like, which is not limited in the embodiments of the present disclosure. If the thermal runaway triggering operation is the heating operation of the external heating module, the heating device can be in close contact with the surface of the battery cell.

[0096] The heating power can be set according to the corresponding standard.

[0097] Before the experiment, some preparations can be made, such as setting of experimental conditions, construction of experimental devices, etc. For the experimental conditions, the experimental environment setting, experimental device inspection, and pre-experiment battery structure inspection can be included.

[0098] For the experimental environment, the corresponding requirements can be set according to the test environment requirements, such as setting the test environment temperature greater than 0℃, the relative humidity of 10-90%, the atmospheric pressure of 86kpa-106kpa, the wind speed of ≤2.5km / h, and installing and configuring the related equipment of the experimental environment according to the requirements of the experimental conditions.

[0099] For the experimental device, it can be checked in advance whether the experimental device is running normally, and the experiment can be carried out only after the normal operation. The experimental device inspection can include whether the data transmission of the test system is normal, whether the sensor is normal, whether the cooling system is normal, etc.

[0100] For the battery structure, the insulation performance of the battery structure can be checked, whether the air tightness of the battery structure meets the requirements, etc.

[0101] After the above experimental conditions are prepared, the pre-experiment preparation is carried out, and the pre-experiment preparation process is as follows:

[0102] 1. Adjust the SOC (State of Charge) of the battery structure to not less than 95% of the specified normal SOC working range. Of course, the specific proportion requirement can be set according to the requirements of the experiment, which is not limited in the present disclosure.

[0103] 2. Arrange temperature sensors and voltage sensors at the corresponding positions of the target battery cell and the surrounding battery cells.

[0104] 3. Arrange air pressure sensors in the battery structure or the detection box.

[0105] 4. Set the upper cover tooling on the detection box. The upper cover tooling simulates the vehicle frame.

[0106] 5. Preheat the temperature of the battery structure to all NTC (Negative Temperature Coefficient) temperatures to reach a specified temperature.

[0107] Wherein, NTC is a commonly used temperature sensor, the resistance value of which increases with the decrease of temperature, and decreases with the increase of temperature. By measuring the resistance value of NTC, the temperature of the battery pack can be indirectly known.

[0108] In the present disclosure, a plurality of NTC sensors are arranged in the battery structure. NTC thermistors are used to monitor and protect the internal temperature of lithium batteries during charging and discharging. As the temperature rises, the resistance of NTC will decrease significantly, and this feature allows NTC to accurately detect changes in temperature. During charging, NTC can detect ambient temperature, allowing fast charging, while detecting battery heating caused by abnormal current, thereby avoiding performance degradation or safety accidents caused by battery overheating. As a temperature sensor, NTC has small size, high integration, and is easy to layout and install in the power battery pack. Through cooperation with the battery management system, NTC can realize real-time monitoring and accurate control of the battery temperature.

[0109] 6. Detect the coolant of the liquid cooling system, ensure that the liquid cooling system is full of coolant, and control the circulation flow and circulation time as required.

[0110] In the present disclosure, the liquid cooling system can simulate the circulation flow and circulation time of the liquid cooling system of the vehicle.

[0111] 7. Check whether the trigger is normal to ensure that the trigger is normal.

[0112] After the above preparation steps are completed, the subsequent thermal runaway test process can be performed, such as steps 101-103.

[0113] In an embodiment of the present disclosure, each trigger corresponds to a different cell;

[0114] The step of performing thermal runaway trigger operation on the target cell in the target region corresponding to the target working condition by the trigger corresponding to the target working condition, comprises:

[0115] Determine the target region corresponding to the target working condition, and determine the cell in the target region as the target cell;

[0116] Control each trigger corresponding to the target working condition to perform thermal runaway trigger operation on the target cell corresponding to each trigger.

[0117] In the present disclosure, a target region corresponding to a target working condition is determined first, and the target regions corresponding to different working conditions are different. The battery cell in the target region is taken as a target battery cell. In addition, the target working condition also corresponds to a trigger piece, which can also be determined by the target region to be in the target region. Each battery cell can have a corresponding trigger piece, and the trigger piece and the battery cell can be in a one-to-one correspondence. Then, each trigger piece can control the thermal runaway trigger operation on the target battery cell corresponding to the trigger piece.

[0118] In an embodiment of the present disclosure, the step of acquiring the thermal runaway parameters of the target battery cell and the adjacent battery cell of the target battery cell by the sensor respectively includes:

[0119] When the number of battery cells between the battery cell outside the target battery cell and the target battery cell is zero, the battery cell is determined as the adjacent battery cell of the target battery cell; each target battery cell corresponds to at least one adjacent battery cell;

[0120] The thermal runaway parameters of the target battery cell and the adjacent battery cell are acquired by the sensor respectively.

[0121] In the present disclosure, when determining the adjacent battery cell of the target battery cell, the battery cell next to the target battery cell can be taken as the adjacent battery cell. Specifically, for any battery cell, if the number of battery cells between the battery cell and the target battery cell is zero, it means that there is no other battery cell between the battery cell and the target battery cell, and the battery cell is determined as the adjacent battery cell of the target battery cell.

[0122] When there are multiple target battery cells, the above steps are judged for the multiple target battery cells to determine the adjacent battery cell. Then, the thermal runaway parameters of the target battery cell and the adjacent battery cell are acquired by the sensor respectively.

[0123] In an embodiment of the present disclosure, when the target working condition is a bottom scraping working condition, the target working condition corresponds to a first region or a second region; the first region and the second region are middle regions of the two ends of the vehicle axial direction corresponding to the battery structure;

[0124] When the target working condition corresponds to the first region, the target battery cell is N battery cells continuously from the first region to the second region; N is a natural number greater than or equal to 2;

[0125] When the target working condition corresponds to the second region, the target battery cell is N battery cells continuously from the second region to the first region;

[0126] The thermal runaway trigger operation is a needle operation on the battery cell.

[0127] In the present disclosure, a bottom scraping condition can be simulated, which can be understood as the bottom of the vehicle being scratched. The bottom scraping is divided into front scraping and rear scraping, and usually involves continuous damage to multiple cells, and the needle piercing is closer to the short circuit of the battery caused by the bottom scraping. Therefore, the present application can set a corresponding target area for the bottom scraping condition.

[0128] As Figure 2 , the first area can be area 1 in Figure 2 , and the second area can be area 2 in Figure 2 . Area 1 and area 2 can be the middle area of the two ends of the vehicle axial direction of the battery structure. It can be understood that area 1 can be the middle area of one end of the battery structure towards the front direction, and area 2 can be the middle area of one end of the battery structure towards the rear direction, such as the Y direction in Figure 2 .

[0129] Assuming that the bottom scraping condition is front scraping, i.e. the bottom scraping of the vehicle when driving forward, the target area is area 1, and then the selected target cell is N cells in the direction from area 1 to area 2. Wherein, N is an integer greater than or equal to 2.

[0130] Assuming that the bottom scraping condition is rear scraping, i.e. the bottom scraping of the vehicle when reversing, the target area is area 2, and then the selected target cell is N cells in the direction from area 2 to area 1.

[0131] In the bottom scraping condition, in order to adapt to the corresponding condition, the trigger mode adopted is the needle piercing operation on the cells.

[0132] And in order to adapt to front scraping or rear scraping, the needle piercing sequence of N cells can also be controlled. For example, for front scraping, the needle piercing operation on N cells corresponding to N cells can be controlled in sequence from area 1 to area 2. For example, there are three cells A, B and C in the direction from area 1 to area 2, then the needle piercing operation on cell A corresponding to cell A can be controlled first, then the needle piercing operation on cell B corresponding to cell B can be controlled, and then the needle piercing operation on cell C corresponding to cell C can be controlled. The time interval between the two needle piercing operations can be set as needed, such as 0.2 seconds, and the present application does not limit it.

[0133] In the present disclosure, the number of target cells in the bottom scraping condition can be multiple, such as 3-5, and of course the present disclosure does not limit it.

[0134] In an embodiment of the present disclosure, when the target working condition is a collision working condition, the region corresponding to the target working condition is at least one of a first region, a second region, a third region, and a fourth region; the first region and the second region are middle regions of two ends of the battery structure in the vehicle axial direction; and the third region and the fourth region are middle regions of the battery structure in the vehicle transverse direction.

[0135] The thermal runaway triggering operation is a needling operation on the battery cell.

[0136] For the needling triggering mode, the material of the needle can be rigid, the diameter of the needle can be 3-10 mm, and the taper of the needle can be 20-60°; the speed of the needle can be 0.1 mm / s-10 mm / s; and the position of the needle can be perpendicular to the direction of the single battery cell, such as for a square battery cell, the needle can be perpendicular to the direction of any one side; and for a cylindrical battery cell, the needle can be perpendicular to the direction of the cylindrical side wall.

[0137] As Figure 2 , the first region can be region 1 in Figure 2 , the second region can be region 2 in Figure 2 , the third region can be region 3 in Figure 2 , and the fourth region can be region 4 in Figure 2 . The region 1 and the region 2 are as described above. The region 3 and the region 4 can correspond to the two sides of the vehicle, respectively, such as the region 3 can be the middle region of the left side of the battery structure, which is the same as the left side of the vehicle, and the region 4 can be the middle region of the right side of the battery structure, which is the same as the right side of the vehicle. Wherein, the transverse direction is the X direction in Figure 2 .

[0138] In the present disclosure, the collision working condition of the vehicle can be simulated, which is generally a collision from at least one of the front, the rear, the left side, and the right side of the vehicle, and usually involves continuous damage to multiple battery cells, and the needle is closer to the short circuit of the battery caused by the collision. Therefore, at least one of the regions 1 to 4 can be selected as the target region, and then the corresponding target battery cell can be selected from the corresponding region. In the present disclosure, multiple target battery cells can be selected in each region, such as 3-5 target battery cells.

[0139] The collision working condition generally pierces the battery cell, so the thermal runaway triggering operation is a needling operation on the battery cell. For the collision working condition, for multiple target battery cells corresponding to a single region, the needle can simultaneously perform a needling operation on the target battery cells to pierce the battery cell.

[0140] In an embodiment of the present disclosure, when the target working condition is a natural working condition of the battery, the region corresponding to the target working condition is a fifth region, and the fifth region is a central region of the plurality of battery cells.

[0141] The thermal runaway triggering operation is a heating operation of a built-in heating module of the target battery cell.

[0142] In the present disclosure, the natural of the power battery of the vehicle can be simulated, and the thermal runaway of a certain battery cell occurs abnormally. The position of the battery cell is indefinite, and the geometric center can be equivalent to most positions. The target battery cell can be heated to simulate the spontaneous combustion of the battery. Referring to Figure 2 , the fifth region can be a central region of the plurality of battery cells, for example, region 5. The target battery cell can be selected from the plurality of battery cells in region 5, for example, 2 battery cells.

[0143] Since the natural of the battery is to be simulated, the thermal runaway triggering operation is a heating operation of a built-in heating module of the target battery cell. In the present disclosure, if the natural of the battery defect is to be tested, during the preparation of the early experiment, a corresponding heating device can be set according to the type of the battery cell, for example, a thin film heating device is used for a square cell, and the thin film heating device is in close contact with the battery cell; a rod-shaped heating device is used for a cylindrical battery cell, and the rod-shaped heating device is arranged in the middle of the winding core and is in close contact with the winding core.

[0144] In an embodiment of the present disclosure, when the target working condition is an external fire working condition, the region corresponding to the target working condition is a third region and a fourth region, and the third region and the fourth region are middle regions of the battery structure corresponding to the transverse direction of the vehicle.

[0145] The thermal runaway triggering operation is a heating operation of an external heating module close to the target battery cell on the outside of the battery structure.

[0146] In the present disclosure, the external fire working condition can be simulated. The external heat source is usually transmitted from both sides of the vehicle, and an external heating mode can be used to simulate the external ignition point of the battery.

[0147] As Figure 2 , the third region and the fourth region are the battery parts corresponding to the two sides of the vehicle. At least one of the third region and the fourth region can be selected according to the actual test requirement. The target battery cell is selected for the third region and the fourth region, respectively. The number of the target battery cell can be at least 2, for example, 2-5.

[0148] In order to simulate the external fire, the external heating module is arranged on the left side of the target battery cell in the third region, and the external heating module is arranged on the right side of the target battery cell in the fourth region. The external heating module can be a heating plate or the like, which is not limited in the present disclosure.

[0149] In order to compare the differences between various working conditions, the comparison of the above several working conditions can refer to the following table 1:

[0150] Table 1

[0151]

[0152] Of course, in addition to the above several working conditions, more working conditions can be set according to actual needs in the present disclosure, and the present disclosure does not add them now.

[0153] After step 101 is executed, the target battery cell enters a thermal runaway state, and then in step 102, the host computer can collect thermal runaway parameters of the target battery cell and the adjacent battery cells around the target battery cell through sensors, and then in step 103, the host computer can generate test results based on the thermal runaway parameters of the target battery cell and the adjacent battery cells around the target battery cell. Of course, the host computer will record the association between these test results and the identification of the measured battery. Among them, the thermal runaway parameters are parameters such as temperature at each time point.

[0154] In actual application, after the target battery cell corresponding to the target area is subjected to the thermal runaway triggering operation, data recording is performed, such as recording by the battery management system, recording by the camera device, etc.

[0155] In actual application, when multiple target battery cells are triggered, the needle piercing or heating can be stopped after one battery cell is monitored to run out of control. Then the battery system performance, the interval time length of the battery cell running out of control, the explosion valve spewing situation, whether there is an open flame, whether there is an abnormal sound, etc. are observed and recorded. If the battery system catches fire, the cooling system is controlled to perform spraying or water immersion and other fire extinguishing measures. If the battery system does not catch fire, it is continuously observed for a period of time, such as 24 hours. Then the test results can be used by the researchers to improve the heat insulation capability or the heat dissipation capability.

[0156] Of course, the thermal runaway parameters can also include air pressure, voltage and other parameters at different times, and then these parameters are corresponded to the corresponding runaway temperature, which is convenient for further analysis in the future.

[0157] In an embodiment of the present disclosure, step 103 can include:

[0158] Sub-step 1031, respectively generating thermal runaway parameter curves corresponding to the target battery cell and the adjacent battery cells according to the thermal runaway parameters of the target battery cell and the adjacent battery cells;

[0159] Sub-step 1032, determining the thermal safety performance of the battery structure based on the thermal runaway parameter curves.

[0160] In the present disclosure, the temperatures of the target cell and the surrounding cells at each collection time point can be obtained, and then the corresponding temperature-time curve can be generated based on these sample points, and then the thermal safety performance of the battery structure can be analyzed based on the temperature-time curve.

[0161] For better illustration of the present application, reference is made to Figure 3 and Figure 4 , Figure 3 for another target cell and surrounding cell example, Figure 4 for target cell 1# and target cell 2#, the temperature-time curve of adjacent cell 1#.

[0162] Figure 3 In the middle of the target cell and the surrounding 10 cells, the heat insulation and cooling are the same as the vehicle system, and the two target cells are triggered at the same time by using the built-in heating method. Then the test result graph of Figure 4 is generated based on the thermal runaway parameters. As Figure 4 Due to the heat transfer of the target cell, the temperature of the adjacent cell increases, and after a period of time, the temperature slowly decreases after reaching the highest temperature point. After about 20 min, the surface temperature of the three cells is less than 100℃, and the adjacent cell does not occur thermal runaway within 40 min, indicating that the battery structure has very small risk of thermal runaway in the case of simultaneous failure of two cells.

[0163] Referring to Figure 5 , it is a needle puncture trigger for three target cells, the diameter of the needle is 5mm, the puncture speed is 5mm / s, and the needle is vertically inserted from the bottom of the battery. Stop puncturing after monitoring the target cell 1# runaway, target cell 2# and target cell 3# immediately occur runaway, adjacent cell 1 temperature rises after 20min, indicating that the adjacent cell occurs thermal runaway. According to the results, it is shown that the battery has a risk of heat spread when three cells are triggered at the same time. In order to improve the safety performance of the battery pack, the heat insulation capacity or the heat dissipation capacity can be improved, the maximum temperature of the adjacent cell can be reduced, and the cooling rate can be improved to avoid the occurrence of three cell thermal runaway leading to fire in actual working conditions, endangering the safety of passengers. This way can clearly determine the heat diffusion time, provide a reference for passenger escape and rescue, and also provide a reference for battery pack design. In the design stage, the protection is strengthened to fully avoid the simultaneous triggering of the boundary cell number of the battery pack leading to heat spread.

[0164] The battery structure thermal runaway test method provided by the embodiments of the present disclosure divides the layout of the battery structure into multiple regions according to the actual working condition requirements, and then controls the trigger corresponding to the target working condition according to the actual target working condition to be tested in the test process, and performs thermal runaway test on the target battery of the target region corresponding to the target working condition, and analyzes the thermal runaway parameters of the target battery and the adjacent battery of the target battery based on the corresponding sensor. In this way, different working conditions can be simulated and tested flexibly, and the state of the adjacent battery can be observed by triggering the target battery, so that the safety of the battery structure can be tested. Moreover, since the test is performed on the region and the target battery that are selected and adapted according to the working condition, the safety of the battery structure can be tested more comprehensively and accurately, and multiple batteries can be triggered to thermal runaway at the same time, which is more consistent with the actual road risk working condition.

[0165] Figure 6 The battery structure thermal runaway test method flowchart provided by the embodiments of the present disclosure. The method can test the safety performance of the battery structure under various working conditions, more comprehensively and accurately, and can reduce the battery pack level test through simulation, saving cost and resources.

[0166] Step 201, determining the target working condition to be tested; wherein the target regions corresponding to different target working conditions in the simulation model are at least partially different, and the target batteries corresponding to the target regions under different target working conditions are at least partially different; the simulation model is generated based on a battery structure, and the battery structure includes a plurality of batteries, the plurality of batteries including a target battery and adjacent batteries around the target battery;

[0167] In the present disclosure, the battery structure is, for example, the aforementioned battery pack, battery module, etc. The initial parameters of the battery structure include at least one of the density, specific heat capacity, and thermal conductivity of the thermal conductive glue and the thermal insulation pad. Of course, it can also include parameters such as water temperature, flow rate, and start-up strategy of the cooling system.

[0168] The battery pack structure includes batteries, thermal insulation pads, and cooling systems, and the specific structure can refer to the actual product structure, which is not limited in the present disclosure. The battery structure includes a plurality of batteries, and the plurality of batteries include a target battery and adjacent batteries around the target battery, which can be referred to in the foregoing Figure 2 .

[0169] In the present disclosure, a thermal runaway simulation model of the battery can be first constructed based on the initial parameters and the component structure of the battery structure. The distribution of the battery structure in the thermal runaway simulation model is consistent with the distribution of the battery structure in the actual battery structure, and the initial parameters of the battery structure are consistent with the initial parameters of the actual battery structure. Figure 2Similarly, details will not be elaborated here. In this disclosure, triggering factors that may lead to thermal runaway can also be identified, such as internal short circuits, external short circuits, overcharging, over-discharging, and high temperatures, and the relationship between these triggering factors and thermal runaway can be quantified. Then, the heat conduction equation is used to describe the heat transfer between individual battery cells and adjacent battery cells. Considering the thermal coupling effect between battery cells, heat convection and heat radiation equations are introduced to describe the heat exchange between the cell and the environment, thereby establishing a thermal model.

[0170] Furthermore, for lithium-ion batteries, chemical kinetic models are needed to describe the decomposition of the SEI film (solid electrolyte interface), the decomposition of the positive electrode material, and the reaction between the negative electrode material and the electrolyte. These models will describe the chemical reaction rates and heat release during thermal runaway within the battery. For other types of batteries, chemical kinetic models can also be developed according to specific needs.

[0171] Then, the thermal model and the chemical reaction kinetic model are integrated into a simulation framework, and numerical methods (such as the finite difference method, the finite element method, etc.) are used to solve these equations.

[0172] Then, the accuracy of the model is verified using experimental data or existing thermal runaway test results. The parameters of the model are adjusted and calibrated according to the verification results. After the accuracy reaches the preset value, step 202 can be executed.

[0173] Further determine the target operating conditions for testing, wherein the target areas corresponding to different target operating conditions in the cell distribution are at least partially different, and the target cells corresponding to the target areas under different target operating conditions are at least partially different.

[0174] Then select the operating condition to be tested, as shown in Table 1 above. Figure 2 The relevant descriptions allow you to select different operating conditions according to your needs. Different operating conditions correspond to the corresponding target area, target cell, and triggering method.

[0175] In this disclosure, a working condition selection interface can be provided to users, which displays a working condition selection button and a battery structure distribution diagram. Users can select a working condition on the interface and a target area in the battery structure distribution diagram.

[0176] Of course, in practical applications, there are limitations on the areas corresponding to different working conditions. If the area selected by the user conflicts with the area range corresponding to the working condition, the user can be prompted that the selection is incorrect.

[0177] For example, in Table 1, the bottom-scraping condition can only be selected from area 1 or area 2. If the user selects the bottom-scraping condition and then selects area 3 in the battery structure distribution map, an error message will be displayed.

[0178] The external fire burning condition can only select region 3 or region 4. If the user selects the external fire burning condition, and then the battery structure distribution diagram selects region 5, an error selection can be prompted.

[0179] In step 202, a thermal runaway triggering operation is performed on a target battery cell in a target region corresponding to the target condition.

[0180] After determining the target condition, the thermal runaway of the target battery cell can be triggered in the simulation mode corresponding to the triggering mode of the target condition. Figure 1 Similar to the embodiment, different conditions correspond to different target regions, and the target region has corresponding trigger and target battery cell. The thermal runaway triggering operation on the target battery cell is to heat or puncture the target battery cell to make the target battery cell lose control at a constant temperature. In this step 202, the target region of the target condition can be directly determined in the simulation model, and the target battery cell in the target region can be determined. The target battery cell can be a submodel in the simulation model, and each target battery cell submodel can have a corresponding configuration parameter file. Modifying the temperature parameter in the configuration parameter file, for example, increasing, can simulate the thermal runaway of the target battery cell based on the heat conduction equation and chemical kinetics model used when the simulation model is constructed.

[0181] In step 203, based on the simulation model, the thermal physical parameters of the battery cell, and the temperature-preset parameter relationship of the battery cell, the thermal diffusion process of the battery cell is simulated; the preset parameter includes heat generation rate and / or exhaust volume;

[0182] In the disclosed idea, different types of battery cells can have different thermal physical parameters of the battery cell and temperature-preset parameter relationships of the battery cell, such as temperature-heat generation rate relationship and temperature-exhaust volume relationship. The temperature-heat generation rate relationship can be obtained in advance according to the ARC (accelerating rate calorimeter) thermal runaway test of the battery cell. According to the ARC thermal runaway test of the battery cell, the relationship between temperature and heat generation rate T-dT / dt can be obtained, and according to P=cmdT / dt, it can be converted into the relationship between temperature and heat generation power T-P.

[0183] The formula P=cm*dT / dt is a thermal formula describing the change of temperature of an object with time when it is heated by a constant power. Wherein, P is the heat generation power (unit: W), c is the specific heat capacity (unit: J / (kg·K)), m is the mass of the object (unit: kg), dT is the change of temperature (unit: K), and dt is the change of time (unit: s).

[0184] Wherein, 5. The thermal physical parameters of the battery cell include at least one of the specific heat capacity, the thermal conductivity, the density, and the thermal resistance of the battery cell.

[0185] After triggering the thermal runaway, the aforementioned thermal physical parameters of the battery cell, the temperature-preset parameter relationship of the battery cell, and the distribution position of the target battery cell are input into the simulation model for simulation.

[0186] In step 204, the thermal runaway parameters of the target battery cell and the adjacent battery cell during the heat diffusion process are obtained respectively.

[0187] For the simulation process in the simulation model, the temperature of the target battery cell and the adjacent battery cell can be obtained at different times.

[0188] In step 205, the test results corresponding to the battery structure are generated according to the thermal runaway parameters.

[0189] For example, referring to the foregoing Figure 3 , it is assumed that a thermal runaway simulation model is constructed for the battery cell structure, and then the processes of steps 202-207 are performed to obtain a temperature-time relationship diagram of Figure 3 Figure 4

[0190] The battery structure thermal runaway test method provided by the embodiments of the present disclosure divides the layout of the battery structure into multiple regions according to the actual working condition requirements, and then controls the trigger corresponding to the target working condition to perform thermal runaway test on the target battery cell in the target region corresponding to the target working condition during the test according to the actual target working condition to be tested. Then, the thermal runaway parameters of the target battery cell and the adjacent battery cells around the target battery cell are collected based on the corresponding sensors for analysis. In this way, different working conditions can be simulated and tested flexibly, and the state of the adjacent battery cells can be observed by triggering the target battery cell, so that the safety of the battery structure can be tested. Moreover, since the test is performed on the target battery cell in the region and the target battery cell that are selected and adapted according to the working condition, the safety of the battery structure can be tested more comprehensively and accurately. Moreover, multiple battery cells can be triggered to thermal runaway at the same time, which is more consistent with the actual road risk working condition. Moreover, simulation can reduce the battery pack level test, saving cost and resources.

[0191] Figure 7 The structure of the battery structure thermal runaway test system provided by the embodiments of the present disclosure is shown in the structure diagram. The battery structure is arranged in a detection box, and the battery structure includes a plurality of battery cells, at least part of which is provided with a corresponding sensor. The detection box is provided with a trigger for the plurality of battery cells. The system includes:

[0192] The control module 301 is configured to control the trigger corresponding to the target working condition to perform thermal runaway triggering operation on the target battery cell in the target region corresponding to the target working condition. Different target working conditions correspond to at least partially different target regions in the battery structure, and the target battery cells corresponding to the target regions under different target working conditions are at least partially different. ​​

[0193] The out-of-control parameter acquisition module 302 is configured to acquire the thermal runaway parameters of the target battery cell and the adjacent battery cell of the target battery cell respectively through the sensor.

[0194] The performance analysis module 303 is configured to generate a test result corresponding to the battery structure according to the thermal runaway parameters.

[0195] Optionally, each trigger corresponds to a different battery cell.

[0196] The control module comprises:

[0197] The target battery cell submodule is configured to determine a target region corresponding to the target working condition, and determine a battery cell in the target region as a target battery cell.

[0198] The target trigger submodule is configured to control each trigger corresponding to the target working condition to perform a thermal runaway triggering operation on a target battery cell corresponding to each trigger.

[0199] Optionally, the out-of-control parameter acquisition module comprises:

[0200] The adjacent battery cell submodule is configured to determine a battery cell as an adjacent battery cell of the target battery cell when the number of battery cells between the battery cell and the target battery cell is zero; and each target battery cell corresponds to at least one adjacent battery cell.

[0201] The parameter acquisition submodule is configured to acquire the thermal runaway parameters of the target battery cell and the adjacent battery cell of the target battery cell through the sensor.

[0202] Optionally, when the target working condition is a bottom scraping working condition, the region corresponding to the target working condition is a first region or a second region; and the first region and the second region are middle regions of two ends of the vehicle axial direction corresponding to the battery structure.

[0203] When the target working condition corresponds to the first region, the target battery cell is N battery cells continuously from the first region to the second region.

[0204] When the target working condition corresponds to the second region, the target battery cell is N battery cells continuously from the second region to the first region.

[0205] The thermal runaway triggering operation is a needle pricking operation on the battery cell.

[0206] Optionally, in the case where the target working condition is a collision working condition, the region corresponding to the target working condition is at least one of a first region, a second region, a third region, and a fourth region; the first region and the second region are middle regions of both ends of the battery structure in the vehicle axial direction; and the third region and the fourth region are middle regions of the battery structure in the vehicle transverse direction.

[0207] The thermal runaway triggering operation is a needling operation on the battery cell.

[0208] Optionally, in the case where the target working condition is a battery natural working condition, the region corresponding to the target working condition is a fifth region, and the fifth region is a central region of the distribution of the plurality of battery cells.

[0209] The thermal runaway triggering operation is a heating operation of a built-in heating module of the target battery cell.

[0210] Optionally, in the case where the target working condition is an external fire working condition, the region corresponding to the target working condition is the third region and the fourth region, and the third region and the fourth region are middle regions of the battery structure in the vehicle transverse direction.

[0211] The thermal runaway triggering operation is a heating operation of an external heating module close to the target battery cell outside the battery structure.

[0212] Optionally, the performance analysis module is further configured to: generate a thermal runaway parameter curve corresponding to the target battery cell and the adjacent battery cell, respectively, according to the thermal runaway parameters of the target battery cell and the adjacent battery cell; and determine the thermal safety performance of the battery structure based on the thermal runaway parameter curves.

[0213] The battery structure layout is divided into a plurality of regions according to the requirements of actual working conditions, and then in the test process, according to the actual target working condition to be tested, the trigger corresponding to the target working condition is controlled to perform thermal runaway test on the target battery cell in the target region corresponding to the target working condition, and the thermal runaway parameters of the target battery cell and the adjacent battery cells around the target battery cell are collected based on the corresponding sensors for analysis. In this way, different working conditions can be simulated and tested flexibly, the state of the adjacent battery cells is observed by triggering the target battery cell, so that the safety of the battery structure can be tested, and since the test is performed on the target battery cell and the region adapted to the working condition, the safety of the battery structure can be tested more comprehensively and accurately.

[0214] Figure 8 A structural schematic diagram of a battery structure thermal runaway test device provided by the embodiments of the present disclosure is provided. The device comprises:

[0215] The working condition determination module 401 is configured to determine a target working condition of the test; different target working conditions correspond to different target regions in a simulation model, and target cells in the target regions in different target working conditions are at least partially different; the simulation model is generated based on a battery structure, and the battery structure includes a plurality of cells, including target cells and adjacent cells around the target cells;

[0216] The triggering module 402 is configured to perform a thermal runaway triggering operation on the target cells in the target region corresponding to the target working condition.

[0217] The simulation diffusion module 403 is configured to simulate a cell thermal diffusion process based on the simulation model, cell thermal physical parameters, and a temperature-preset parameter relationship of the cell; the preset parameter includes a heat generation rate and / or an exhaust volume.

[0218] The runaway parameter acquisition module 404 is configured to acquire thermal runaway parameters of the target cells and the adjacent cells in the thermal diffusion process, respectively.

[0219] The performance analysis module 405 is configured to generate a test result corresponding to the battery structure according to the thermal runaway parameters.

[0220] The battery structure thermal runaway test method provided by the embodiments of the present disclosure divides the layout of the battery structure into a plurality of regions according to the requirements of actual working conditions, and then controls the trigger piece corresponding to the target working condition according to the actual target working condition to be tested in the test process, performs thermal runaway test on the target cells in the target region corresponding to the target working condition, and analyzes the thermal runaway parameters of the target cells and the adjacent cells around the target cells based on the corresponding sensors. In this way, different working conditions can be simulated flexibly, the target cells are triggered, and then the state of the adjacent cells is observed, so that the safety of the battery structure can be tested. Moreover, since the test is performed on the regions and target cells that are selected and adapted according to the working conditions, the safety of the battery structure can be tested more comprehensively and accurately, multiple cells can be triggered to thermal runaway at the same time, which is more consistent with actual road risk working conditions, and simulation can reduce battery pack level testing, saving costs and resources.

[0221] Figure 9 FIG. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present disclosure. The following will be specifically described with reference to the drawings. Figure 9 FIG. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present disclosure. The following will be specifically described with reference to the drawings. Figure 9 The electronic device shown in FIG. 1 is only an example, and should not bring any limitation to the functions and use range of the embodiments of the present disclosure.

[0222] As shown in FIG. 1, the electronic device 100 includes a processor 101, a memory 102, a power supply 103, a display 104, and a communication interface 105. Figure 9As shown, the electronic device 600 can include a processing device (e.g., a central processor, a graphics processor, etc.) 601 that can perform various appropriate actions and processes to implement the battery structure thermal runaway test method of embodiments as described in the present disclosure according to programs stored in a read-only memory (ROM) 602 or loaded into a random access memory (RAM) 603 from a storage device 608. Various programs and data required by the electronic device 600 to operate are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other by a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0223] Generally, the following devices can be connected to the I / O interface 605: input devices 606 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 608 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 609. The communication devices 609 can allow the electronic device 600 to communicate wirelessly or wired with other devices to exchange data. Although Figure 9 The electronic device 600 is shown with various devices, but it should be understood that all of the illustrated devices are not required, and more or fewer devices can alternatively be implemented.

[0224] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program according to embodiments of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods illustrated by the flowcharts, thereby implementing the battery structure thermal runaway test method as described above. In such embodiments, the computer program can be downloaded and installed from a network through the communication devices 609, or installed from the storage devices 608, or installed from the ROM 602. When the computer program is executed by the processing device 601, the above-mentioned functions defined in the methods of embodiments of the present disclosure are performed.

[0225] It should be noted that the computer-readable medium described above in the present disclosure can be a computer-readable signal medium or a computer-readable storage medium or any combination thereof. The computer-readable storage medium may, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device. In the present disclosure, the computer-readable signal medium can include a data signal that propagates in a baseband or as part of a carrier wave, carrying computer-readable program code. Such a propagated data signal can take on many forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium that is not a storage medium and that can communicate, transmit, or propagate programs for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wire, cable, fiber optic, RF (radio frequency), or any suitable combination of the above.

[0226] In addition, the embodiment of the present disclosure also provides a vehicle, comprising: a memory; a processor; and a computer program; wherein the computer program is stored in the memory and is configured to be executed by the processor to implement the battery structure thermal runaway test method as described above.

[0227] In some embodiments, the client, server can communicate using any currently known or future developed network protocol, such as HTTP (HyperText Transfer Protocol), and can be interconnected with digital data communication (e.g., communication network) of any form or medium. Examples of communication networks include local area networks ("LAN"), wide area networks ("WAN"), Internet, and end-to-end networks (e.g., ad hoc end-to-end networks), as well as any currently known or future developed networks.

[0228] The above computer-readable medium can be contained in the above electronic device; or can exist separately without being assembled into the electronic device.

[0229] The computer readable medium described above can carry one or more programs, which when executed by the electronic device, cause the electronic device to perform the embodiments described above.

[0230] Optionally, when the one or more programs are executed by the electronic device, the electronic device can further perform other steps described in the embodiments.

[0231] Computer program code for carrying out operations of the present disclosure can be written in any one or more of a variety of programming languages or combinations of languages, including an object-oriented programming language such as Java, Smalltalk, C++, or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0232] The flow diagrams and the block diagrams in the drawings are illustrations of architectures, functionalities, and operations of possible implementations of systems, methods, and computer program products according to various embodiments of present disclosure. In this regard, each block in the flow diagrams or block diagrams can represent a module, a procedure, or a part of code, which comprises one or more executable instructions for implementing the specific logical functions specified for the block. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or in the reverse order, depending on the functionality involved. It will also be noted that each block in the block diagrams and / or flow diagrams, and combinations of blocks in the block diagrams and / or flow diagrams, can be implemented by special purpose hardware-based systems that perform the specified functions or operations, or combinations of special purpose hardware and computer instructions.

[0233] The units described in the embodiments of the present disclosure can be implemented by software, or by hardware. In some cases, the name of the unit does not constitute a limitation on the unit itself.

[0234] The functionality described above in this document can be performed, at least in part, by one or more hardware logic components. For example, and without limitation, non- transitory machine-readable media can include RAM, ROM, programmable ROM (EPROM, EEPROM or flash memory), or any other storage device(s) through which program instructions can be stored and executed by a processing unit. The above described functions can be implemented as software modules or software functions using object-oriented design methodology, or using any other suitable programming technique.

[0235] In the context of the present disclosure, a machine-readable medium can be a tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium will include one or more of: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0236] The foregoing description merely exemplifies the preferred embodiments of the disclosure and the principles of the technology involved. It is believed that those skilled in the art can accomplish the disclosure with the enclosed claims without any creative work. The scope of the disclosure should not be limited by the technical features of the specific embodiments described above, but should include all the technical solutions falling within the concept of the disclosure, which are obtained by combining the technical features described above or equivalent features thereof in any manner. For example, the technical solutions formed by replacing the above-described features with the technical features disclosed in the disclosure (but not limited to) having similar functions.

[0237] In addition, although each operation is depicted in a particular order, this should not be understood as requiring the operations to be performed in the particular order shown or in sequential order. Under certain circumstances, multitasking and parallel processing can be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the disclosure. Certain features described in the context of separate embodiments can also be combined in a single embodiment. Conversely, various features described in the context of a single embodiment can also be implemented in multiple embodiments. The various features described in the context of the single embodiment can also be implemented individually or in any suitable sub-combination.

[0238] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method for testing thermal runaway of a battery structure, characterized in that, The battery structure is set inside the testing box. The battery structure includes multiple battery cells, and at least some of the battery cells are equipped with corresponding sensors. The testing box is equipped with triggers for the plurality of battery cells; the method includes: The triggering element corresponding to the target operating condition is controlled to perform a thermal runaway triggering operation on the target cell in the target area corresponding to the target operating condition; wherein, the target areas corresponding to different target operating conditions in the battery structure are at least partially different, and the target cells corresponding to the target areas under different target operating conditions are at least partially different. The thermal runaway parameters of the target cell and its adjacent cells are obtained by the sensors. Based on the thermal runaway parameters, test results corresponding to the battery structure are generated.

2. The method according to claim 1, characterized in that, Each trigger corresponds to a different battery cell; The step of triggering the target cell within the target area corresponding to the target operating condition to perform a thermal runaway triggering operation includes: Determine the target area corresponding to the target operating condition, and determine the battery cell located within the target area as the target battery cell; Control each trigger corresponding to the target operating condition, and perform thermal runaway triggering operation on the target cell corresponding to each trigger.

3. The method according to claim 1, characterized in that, The step of acquiring the thermal runaway parameters of the target cell and its adjacent cells using the sensor includes: When the number of cells outside the target cell and between the target cell and the target cell is zero, the cell is determined to be an adjacent cell of the target cell; each target cell corresponds to at least one adjacent cell. The thermal runaway parameters of the target cell and the adjacent cell are obtained by the sensors.

4. The method according to claim 1, characterized in that, When the target working condition is a scraping condition, the area corresponding to the target working condition is a first area or a second area; the first area and the second area are the middle areas of the two ends of the battery structure in the axial direction of the vehicle. In the case of the first region corresponding to the target operating condition, the target cell is N cells continuously arranged from the first region toward the second region; N is a natural number greater than or equal to 2. In the case of the second region corresponding to the target operating condition, the target cell consists of N consecutive cells moving from the second region toward the first region. The thermal runaway triggering operation is to perform a needle puncture operation on the battery cell.

5. The method according to claim 1, characterized in that, When the target operating condition is a collision condition, the area corresponding to the target operating condition is at least one of the first area, the second area, the third area, and the fourth area; the first area and the second area are the middle areas of the two ends of the battery structure in the axial direction of the vehicle. The third and fourth regions are the middle regions of the battery structure in the lateral direction of the vehicle. The thermal runaway triggering operation is to perform a needle puncture operation on the battery cell.

6. The method according to claim 1, characterized in that, When the target operating condition is the battery's natural operating condition, the area corresponding to the target operating condition is the fifth area, which is the central area where the multiple battery cells are distributed. The thermal runaway triggering operation is the heating operation of the built-in heating module of the target cell.

7. The method according to claim 1, characterized in that, When the target operating condition is an external fire condition, the area corresponding to the target operating condition is the third area and the fourth area, which are the middle areas of the vehicle in the lateral direction corresponding to the battery structure. The thermal runaway triggering operation is a heating operation performed by an external heating module located on the outside of the battery structure near the target cell.

8. The method according to claim 1, characterized in that, The step of generating test results corresponding to the battery structure based on the thermal runaway parameters includes: Based on the thermal runaway parameters of the target cell and the adjacent cells, thermal runaway parameter curves corresponding to the target cell and the adjacent cells are generated respectively. The thermal safety performance of the battery structure is determined based on the thermal runaway parameter curve.

9. A method for testing the thermal runaway of a battery structure, characterized in that, The method includes: The target operating conditions for testing are determined; wherein, the target areas corresponding to different target operating conditions in the simulation model are at least partially different, and the target cells corresponding to the target areas under different target operating conditions are at least partially different; the simulation model is generated based on the battery structure, which includes multiple cells, including the target cell and the adjacent cells around the target cell; Perform thermal runaway triggering operation on the target cell in the target area corresponding to the target operating condition; Based on the simulation model, the cell's thermal properties, and the temperature-preset parameter relationship of the cell, the cell's thermal diffusion process is simulated; the preset parameters include heat generation rate and / or exhaust volume. During the thermal diffusion process, the thermal runaway parameters of the target cell and the adjacent cell are obtained respectively; Based on the thermal runaway parameters, test results corresponding to the battery structure are generated.

10. A battery structure thermal runaway testing system, characterized in that, A battery structure is housed within a testing chamber, the battery structure comprising multiple battery cells, at least some of which are equipped with corresponding sensors; the testing chamber contains triggers for the multiple battery cells; the system includes: The control module is used to control the triggering element corresponding to the target operating condition to perform thermal runaway triggering operation on the target cell in the target area corresponding to the target operating condition; wherein, the target areas corresponding to different target operating conditions in the battery structure are at least partially different, and the target cells corresponding to the target areas under different target operating conditions are at least partially different. The runaway parameter acquisition module is used to acquire the thermal runaway parameters of the target cell and the adjacent cells of the target cell through the sensor. The performance analysis module is used to generate test results corresponding to the battery structure based on the thermal runaway parameters.

11. A battery structure thermal runaway testing device, characterized in that, The device includes: The operating condition determination module is used to determine the target operating condition for testing; wherein, the target areas corresponding to different target operating conditions in the simulation model are at least partially different, and the target cells corresponding to the target areas under different target operating conditions are at least partially different; the simulation model is generated based on the battery structure, the battery structure includes multiple cells, the multiple cells include the target cell and the adjacent cells around the target cell; The triggering module is used to perform thermal runaway triggering operation on the target cell in the target area corresponding to the target operating condition; The simulated diffusion module is used to simulate the thermal diffusion process of the battery cell based on the simulation model, the thermal properties of the battery cell, and the temperature-preset parameter relationship of the battery cell; the preset parameters include heat generation rate and / or exhaust volume. The runaway parameter acquisition module is used to acquire the thermal runaway parameters of the target cell and the adjacent cell respectively during the thermal diffusion process; The performance analysis module is used to generate test results corresponding to the battery structure based on the thermal runaway parameters.

12. An electronic device, characterized in that, include: Memory; processor; as well as Computer programs; The computer program is stored in the memory and configured to be executed by the processor to implement the method as described in any one of claims 1-9.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-9.

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