Battery thermal protection component detection method and device

Abstract

This application relates to the field of thermal runaway testing technology, and provides a method and apparatus for detecting thermal protection components of a battery. The method is used to detect the thermal barrier effect of a thermal protection component, wherein the thermal protection component is disposed between a target battery and a receiver battery adjacent to the target battery. The method includes: in response to a prompt signal triggering thermal runaway of the target battery, acquiring temperature change data of a first contact surface between the thermal protection component and the target battery, and temperature change data of a second contact surface between the thermal protection component and the receiver battery; and obtaining a thermal barrier detection result of the thermal protection component based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface. The battery thermal protection component detection method provided in this application can effectively detect the thermal barrier effect of the thermal protection component on the battery, improving the detection accuracy of the battery thermal protection component.

Description

Technical Field

[0001] This application relates to the field of thermal runaway testing technology, specifically to a method and apparatus for testing the thermal protection components of a battery. Background Technology

[0002] To improve battery safety, thermal protection components are typically installed on the battery surface, such as heat shields or sheets placed between two adjacent batteries, to provide thermal isolation and reduce safety issues caused by thermal runaway. To determine the effectiveness of these thermal protection components, testing is usually required to assess their thermal barrier properties.

[0003] In related technologies, the testing method for battery thermal protection components involves using a constant-temperature heat source to measure the thermal conductivity of the components, thereby determining their thermal barrier effect. However, the thermal runaway process of a battery is a temperature-varying process. Therefore, using a constant-temperature heat source to test the thermal protection components cannot effectively reflect their thermal barrier effect on the battery, affecting the accuracy of the test results. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a method for testing the thermal protection components of a battery, which can effectively test the thermal barrier effect of the thermal protection components on the battery and improve the accuracy of testing the thermal protection components of the battery.

[0005] According to the battery thermal protection component detection method of the first aspect of the present application, the thermal protection component is used to perform thermal barrier detection on the thermal protection component, wherein the thermal protection component is disposed between a target battery and a receiver battery adjacent to the target battery.

[0006] The method includes:

[0007] In response to a warning signal that triggers thermal runaway of the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired;

[0008] The thermal barrier test result of the thermal protection component is obtained based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface.

[0009] In response to a warning signal indicating thermal runaway in the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, as well as temperature change data of the second contact surface between the thermal protection component and the recipient battery, are acquired. Based on at least one of the temperature change data of the first and second contact surfaces, the thermal barrier detection result of the thermal protection component is obtained. This allows for the detection of heat transfer by the thermal protection component in the event of thermal runaway, effectively reflecting the thermal barrier effect of the thermal protection component when the battery experiences thermal runaway, and improving the detection accuracy of the thermal protection component for the battery.

[0010] According to one embodiment of this application, in response to a warning signal triggering thermal runaway of the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired, including:

[0011] When the contact area between the thermal protection component and the target battery reaches a first preset area, and the contact area between the thermal protection component and the recipient battery reaches a second preset area, in response to the prompt signal that the target battery is triggered to thermal runaway, the temperature change data of the first contact surface between the thermal protection component and the target battery, and the temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired.

[0012] The first preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the target battery, and the second preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the recipient battery.

[0013] According to one embodiment of this application, the thermal barrier detection result of the thermal protection component is obtained based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface, including:

[0014] Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature difference change data between the first contact surface and the second contact surface is obtained.

[0015] Based on the temperature difference change data, the thermal barrier test results of the thermal protection component are obtained.

[0016] According to one embodiment of this application, temperature difference change data between the first contact surface and the second contact surface is obtained based on temperature change data of the first contact surface and temperature change data of the second contact surface, including:

[0017] If the thermal protection component is determined to trigger thermal runaway of the receptor battery, the temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface during a first preset period.

[0018] The first preset time period begins at the moment when the target battery experiences thermal runaway, and the end time of the preset time period is no earlier than the moment when the recipient battery experiences thermal runaway.

[0019] According to one embodiment of this application, temperature difference change data between the first contact surface and the second contact surface is obtained based on temperature change data of the first contact surface and temperature change data of the second contact surface, including:

[0020] Once it is determined that the thermal protection component has not triggered thermal runaway of the receptor battery, the temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface during a second preset period.

[0021] The second preset time period begins when the target battery experiences thermal runaway, and ends when the temperatures of the first contact surface and the second contact surface are the same.

[0022] According to one embodiment of this application, it also includes:

[0023] Based on the temperature change data of the second contact surface, the thermal runaway detection result of the receptor battery is obtained;

[0024] The thermal runaway detection result includes whether the thermal protection component triggers thermal runaway of the receptor battery, or whether the thermal protection component does not trigger thermal runaway of the receptor battery.

[0025] According to one embodiment of this application, the thermal runaway detection result of the receptor battery is obtained based on the temperature change data of the second contact surface, including:

[0026] Based on the temperature change data of the second contact surface, the slope of the tangent line to each temperature data in the temperature change data of the second contact surface is obtained.

[0027] The thermal runaway detection results of the receptor battery are obtained based on the tangent slope of each of the temperature data.

[0028] A battery thermal protection component detection device according to a second aspect embodiment of the present application is used to perform thermal barrier detection on a thermal protection component, wherein the thermal protection component is disposed between a target battery and a receiver battery adjacent to the target battery.

[0029] The device includes:

[0030] The temperature change data acquisition module is used to acquire temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery, in response to a prompt signal that triggers thermal runaway of the target battery.

[0031] The thermal protection component detection module is used to obtain the thermal barrier detection result of the thermal protection component based on the temperature change data of the first contact surface and the temperature change data of the second contact surface.

[0032] An electronic device according to a third aspect of this application includes a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the battery thermal protection component detection method described in any of the above embodiments.

[0033] A computer-readable storage medium according to a fourth aspect of this application stores a computer program thereon, which, when executed by a processor, implements the battery thermal protection component detection method described in any of the above embodiments. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the first process of the battery thermal protection component testing method provided in the embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the application environment for the battery thermal protection component testing method provided in the embodiments of this application;

[0037] Figure 3 This is a schematic diagram of the second process of the battery thermal protection component testing method provided in the embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the temperature change curves of the first contact surface and the second contact surface provided in the embodiments of this application;

[0039] Figure 5 This is a schematic diagram of the temperature difference curve between the first contact surface and the second contact surface provided in an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of the structure of the battery thermal protection component detection device provided in the embodiments of this application;

[0041] Figure 7 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] The following will provide a detailed description and explanation of the battery thermal protection component testing method and apparatus provided in this application through several specific embodiments.

[0044] To improve battery safety, thermal protection components are typically installed on the battery surface, such as heat shields or sheets placed between two adjacent batteries, to provide thermal isolation and reduce safety issues caused by thermal runaway. To determine the effectiveness of these thermal protection components, testing is usually required to assess their thermal barrier properties.

[0045] In related technologies, the testing method for battery thermal protection components involves using a constant-temperature heat source to measure the thermal conductivity of the components, thereby determining their thermal barrier effect. However, the thermal runaway process of a battery is a temperature-varying process. Therefore, using a constant-temperature heat source to test the thermal protection components cannot effectively reflect their thermal barrier effect on the battery, affecting the accuracy of the test results.

[0046] Therefore, in one embodiment, a method for testing the thermal protection components of a battery is provided. This method is applied to a testing device to perform thermal barrier testing on the thermal protection components of the battery. The testing device can be an electronic device such as a desktop terminal, mobile terminal, vehicle terminal, or server. The server can be a standalone server or a server cluster composed of multiple servers. It can also be a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence sampling point devices.

[0047] like Figure 1 As shown in the figure, this embodiment provides a method for detecting the thermal protection component of a battery, which is used to detect the thermal barrier of the thermal protection component. The thermal protection component is disposed between a target battery and a receiver battery adjacent to the target battery.

[0048] The method includes:

[0049] Step 101: In response to the warning signal that the target battery is thermally runaway, acquire temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery;

[0050] Step 102: Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, obtain the thermal barrier test result of the thermal protection component.

[0051] In some embodiments, the target battery and the recipient battery can be batteries of the same specifications, such as batteries from the same batch, of the same model, and with the same capacity. The thermal protection component can be a heat insulation plate or heat insulation sheet, or other components used for heat insulation. The target battery 1, the recipient battery 2, and the thermal protection component 3 can be arranged as follows: Figure 2 As shown, the target battery 1, the recipient battery 2, and the thermal protection component 3 are clamped in a clamping plate. The thermal protection component 3 is positioned between the target battery 1 and the recipient battery 2. For example, the first side, A1 side, of the thermal protection component 3 contacts the target battery 1, and the second side, A2 side, contacts the recipient battery 2. This simulates the heat transfer from the target battery 1 to the recipient battery 2 through the thermal protection component 3, thereby simulating a real-world application scenario using dual-battery power supply. A thermal insulation pad can be placed between the clamping plate and the target battery 1 and the recipient battery 2 to eliminate the influence of the thermal conductivity consistency between the clamping plate and the batteries on the test results in each test.

[0052] When thermal runaway detection of a recipient battery is required, thermal runaway of the target battery can be triggered first. This can be achieved by placing a heating element on the surface of the target battery and using that element to heat it, or by methods that can trigger thermal runaway, such as needle penetration or overcharging. To minimize the impact of differences in external energy input on the detection results, a triggering method with lower energy input should be prioritized. During the process of triggering thermal runaway, the detection equipment can determine whether thermal runaway has occurred by detecting the voltage, temperature, or heating rate of the target battery. For example, if a voltage drop exceeding 25% of the initial voltage is detected, and the heating rate dT / dt ≥ 1℃ / s for more than 3 seconds, thermal runaway can be confirmed. Alternatively, if the battery temperature reaches the manufacturer's specified maximum operating temperature, and the heating rate dT / dt ≥ 1℃ / s for more than 3 seconds, thermal runaway can be confirmed.

[0053] When the detection equipment determines that the target battery has experienced thermal runaway, it generates a warning signal that triggers the thermal runaway. In response to this warning signal, starting from the moment the thermal runaway is determined, it acquires temperature change data of the first contact surface between the thermal protection component and the target battery, such as the time-battery temperature curve of the first contact surface. It also acquires temperature change data of the second contact surface between the thermal protection component and the recipient battery, such as the time-battery temperature curve of the second contact surface.

[0054] After obtaining the temperature change data of the first contact surface and the second contact surface, the thermal barrier test result of the thermal protection component can be obtained based on these data. As one possible implementation, the average heating rate of the first contact surface can be obtained from the temperature change data of the first contact surface, and the average heating rate of the second contact surface can be obtained from the temperature change data of the second contact surface. If the average heating rate of the first contact surface is less than or equal to a first preset heating rate, it indicates that the battery's pyrolysis has a relatively small impact on the thermal protection component, and the thermal barrier test result of the thermal protection component can be determined to be satisfactory. If the average heating rate of the first contact surface is greater than the first preset heating rate, the average heating rate of the second contact surface is then tested. If the average heating rate of the second contact surface is less than or equal to the second preset heating rate, it indicates that the heat transfer rate of the thermal protection component is slow, and therefore the thermal barrier test result of the thermal protection component can be determined to be satisfactory; otherwise, the thermal barrier test result of the thermal protection component can be determined to be poor. Alternatively, the average heating rate of the second contact surface can be directly detected. If the average heating rate of the second contact surface is less than or equal to the second preset heating rate, it indicates that the heat transfer rate of the thermal protection component is slow, and therefore the thermal barrier test result of the thermal protection component can be determined to be compliant; otherwise, the thermal barrier test result of the thermal protection component can be determined to be poor. The first and second preset heating rates can be determined according to actual conditions. For example, the average heating rate of the first contact surface detected by the thermal protection component whose thermal barrier test result is determined to be compliant when the target battery triggers a thermal runaway warning signal can be used as the first preset heating rate, and the average heating rate of the second contact surface detected by it can be used as the second preset heating rate.

[0055] Alternatively, the temperature change data of the first contact surface can be detected in relation to the temperature change data of the second contact surface. When the target battery experiences thermal runaway, the temperature of the first contact surface will rise rapidly, while the temperature of the second contact surface will initially rise slowly due to heat transfer from the first contact surface. If the recipient battery does not experience thermal runaway, the temperature of the second contact surface will remain lower than that of the first contact surface at any given time until thermal equilibrium is reached. However, if the recipient battery experiences thermal runaway due to the temperature of the second contact surface, this runaway will cause the temperature of the second contact surface to rise rapidly, potentially exceeding the temperature of the first contact surface at some point. Therefore, if the temperature change data of the first contact surface at any given time is greater than or equal to the temperature change data of the second contact surface at that time, it indicates that the temperature of the second contact surface will not cause thermal runaway in the recipient battery. In this case, the thermal barrier test result of the thermal protection component can be determined to be compliant with the thermal barrier standard. If there is a time point where the temperature change data of the first contact surface is less than that of the second contact surface, it indicates that the temperature of the second contact surface will cause thermal runaway of the acceptor battery. In this case, it can be determined that the thermal barrier test result of the thermal protection component is not up to standard.

[0056] In response to a warning signal indicating thermal runaway in the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, as well as temperature change data of the second contact surface between the thermal protection component and the recipient battery, are acquired. Based on at least one of the temperature change data of the first and second contact surfaces, the thermal barrier detection result of the thermal protection component is obtained. This allows for the detection of heat transfer by the thermal protection component in the event of thermal runaway, effectively reflecting the thermal barrier effect of the thermal protection component when the battery experiences thermal runaway, and improving the detection accuracy of the thermal protection component for the battery.

[0057] To further improve the confidence of the detection results of the thermal protection component of the battery, in some embodiments, in response to a warning signal that triggers thermal runaway of the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired, including:

[0058] When the contact area between the thermal protection component and the target battery reaches a first preset area, and the contact area between the thermal protection component and the recipient battery reaches a second preset area, in response to the prompt signal that the target battery is triggered to thermal runaway, the temperature change data of the first contact surface between the thermal protection component and the target battery, and the temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired.

[0059] The first preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the target battery, and the second preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the recipient battery.

[0060] In some embodiments, before performing thermal runaway detection on the recipient battery, the contact area between the first contact surface of the thermal protection component and the target battery, and the contact area between the second contact surface of the thermal protection component and the recipient battery, need to be determined. If the contact area between the first contact surface and the target battery is the maximum area that the first contact surface can contact the target battery, it indicates that the first contact surface is most affected by the temperature of the target battery. Similarly, if the contact area between the second contact surface and the recipient battery is the maximum area that the second contact surface can contact the recipient battery, it indicates that the recipient battery is most affected by the temperature of the second contact surface. Then, thermal runaway detection on the thermal protection component can be performed, and in response to a warning signal indicating that thermal runaway has occurred in the target battery, temperature change data of the first and second contact surfaces of the thermal protection component can be obtained. Since thermal protection components are tested for thermal barrier properties only when the contact area between the first contact surface of the thermal protection component and the target battery reaches the maximum contact area, and the contact area between the second contact surface of the thermal protection component and the recipient battery reaches the maximum contact area, it is possible to avoid the situation where the heat generated by the target battery during thermal runaway cannot be transferred to the thermal protection component due to insufficient contact area, or the heat generated by the thermal protection component cannot be transferred to the recipient battery, thereby improving the confidence of the test results of the battery's thermal protection components.

[0061] To further improve the accuracy of thermal barrier detection results, in some embodiments, such as Figure 3 As shown, based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface, the thermal barrier test result of the thermal protection component is obtained, including:

[0062] Step 201: Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, obtain the temperature difference change data between the first contact surface and the second contact surface;

[0063] Step 202: Based on the temperature difference change data, obtain the thermal barrier test result of the thermal protection component.

[0064] In some embodiments, after obtaining the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature data at the same time point in the temperature change data of the first contact surface and the temperature change data of the second contact surface can be subtracted to obtain the temperature difference between the first contact surface and the second contact surface at each time point. Based on the temperature difference at each time point, a temperature curve representing the change of the first contact surface and the second contact surface over time can be formed, i.e., temperature difference change data. For example, as shown... Figure 4 As shown, assuming the temperature change data of the first contact surface is T1 and the temperature change data of the second contact surface is T2, the temperature difference change data ΔT = T1 - T2 can be determined. At this point, the corresponding temperature difference change curve can be obtained, as shown below. Figure 5 As shown.

[0065] After obtaining the temperature difference change data, the integral area of ​​the temperature difference over time can be calculated based on the corresponding temperature difference change curve. This integral area is then used to determine the thermal barrier test result of the thermal protection component. The integral area is directly proportional to the thermal barrier test result; a larger integral area indicates that the thermal protection component blocks more heat transfer from the target battery to the recipient battery, resulting in a better thermal barrier test result. For example, this integral area can be compared with a preset area. If the integral area is greater than or equal to the preset area, the thermal barrier test result of the thermal protection component meets the standard; otherwise, it indicates that the thermal barrier test result does not meet the standard. The preset area can be set according to actual conditions. For example, the integral area formed by the temperature difference change data corresponding to a thermal protection component that just meets the standard can be determined as the preset area. Alternatively, different area ranges can be preset to correspond to different thermal barrier levels; a larger area range corresponds to a higher thermal barrier level, i.e., a better thermal barrier effect. After obtaining the integral area corresponding to the temperature difference change data of the thermal protection component, the corresponding thermal barrier level can be determined based on the area range in which the integral area is located, as the thermal barrier test result of the thermal protection component.

[0066] By using the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature difference change data between the first contact surface and the second contact surface is obtained. Based on the temperature difference change data, the thermal barrier test results of the thermal protection component are obtained, so that the obtained thermal barrier test results can better reflect the thermal barrier situation of the thermal protection component after battery thermal runaway, and improve the accuracy of the obtained thermal barrier test results.

[0067] To further improve the accuracy of thermal barrier detection results, in some embodiments, temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, including:

[0068] If the thermal protection component is determined to trigger thermal runaway of the receptor battery, the temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface during a first preset period.

[0069] The first preset time period begins at the moment when the target battery experiences thermal runaway, and the end time of the preset time period is no earlier than the moment when the recipient battery experiences thermal runaway.

[0070] In some embodiments, since the second contact surface is in contact with the recipient battery, when the target battery triggers thermal runaway, the temperature of the first contact surface rises rapidly, while the temperature of the second contact surface initially rises slowly and gradually, eventually stabilizing at a thermal equilibrium. If the temperature of the second contact surface becomes too high, triggering thermal runaway of the recipient battery, the temperature of the second contact surface will rise rapidly, and the temperature difference with the first contact surface will decrease rapidly. The process from the thermal runaway of the target battery to the triggering of thermal runaway of the recipient battery better demonstrates the thermal barrier effect of the thermal protection component. Therefore, if the second contact surface of the thermal protection component is detected to trigger thermal runaway of the recipient battery, temperature change data within a first preset time period can be obtained from the temperature change data of the first contact surface. That is, the time from the moment the target battery experiences thermal runaway to the moment the recipient battery experiences thermal runaway, or a certain moment some time after the recipient battery experiences thermal runaway, can be obtained as the first target temperature change data. Similarly, temperature change data within the first preset time period can be obtained from the temperature change data of the second contact surface as the second target temperature change data.

[0071] After obtaining the first target temperature change data and the second target temperature change data, subtracting the second target temperature change data from the first target temperature change data yields the temperature difference change data between the first contact surface and the second contact surface over a first preset time period. Based on this temperature difference change data, the thermal barrier detection result of the thermal protection component is obtained. In this way, if the thermal protection component triggers thermal runaway of the receiver battery, temperature difference change data between the first and second contact surface that is irrelevant to triggering thermal runaway of the receiver battery can be eliminated. This ensures that the obtained temperature difference change data effectively reflects the heat transfer of the thermal protection component throughout the entire process from the thermal runaway of the target battery to the triggering of thermal runaway of the receiver battery, thereby improving the accuracy of the subsequently obtained thermal barrier detection results.

[0072] In some embodiments, if it is determined that the thermal protection component has not triggered thermal runaway of the receiver battery, the temperature difference change data between the first contact surface and the second contact surface during a second preset period can be obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface; wherein, the start time of the second preset period is the time when the target battery experiences thermal runaway, and the end time of the second preset period is the time when the temperatures of the first contact surface and the second contact surface are the same.

[0073] Specifically, if the second contact surface of the thermal protection component is detected to trigger thermal runaway of the recipient battery, temperature change data from the moment the target battery experiences thermal runaway to the moment when the temperatures of the first and second contact surfaces are the same can be obtained from the temperature change data of the first contact surface as the third target temperature change data. Similarly, temperature change data from the moment the target battery experiences thermal runaway to the moment when the temperatures of the first and second contact surfaces are the same can be obtained from the temperature change data of the second contact surface as the fourth target temperature change data.

[0074] After obtaining the third and fourth target temperature change data, subtracting the fourth target temperature change data from the third target temperature change data yields the temperature difference change data between the first and second contact surfaces over a second preset time period. This temperature difference change data is then used to obtain the thermal barrier detection result of the thermal protection component. In this way, if the thermal protection component does not trigger thermal runaway of the acceptor battery, the temperature difference change data between the first and second contact surfaces that does not affect the thermal barrier of the thermal protection component can be discarded. This ensures that the obtained temperature difference change data effectively reflects the entire heat transfer process from the thermal runaway of the target battery to the point where the two contact surfaces of the thermal protection component reach thermal equilibrium, thereby improving the accuracy of the subsequent thermal barrier detection results.

[0075] Regarding whether the thermal protection component triggers thermal runaway of the recipient battery, one approach is to perform thermal runaway detection on the recipient battery when thermal runaway of the target battery is detected. This could be achieved by using a temperature sensor or voltage sensor mounted on the recipient battery to detect its temperature or voltage and determine whether thermal runaway has occurred. However, this method requires additional electronic devices to detect the recipient battery, making the detection process cumbersome. Therefore, to more conveniently detect whether thermal runaway has occurred in the recipient battery, in some embodiments, the thermal runaway detection result of the recipient battery can be obtained based on the temperature change data of the second contact surface. The thermal runaway detection result includes whether the thermal protection component triggers thermal runaway of the recipient battery, or whether the thermal protection component does not trigger thermal runaway of the recipient battery.

[0076] For example, if the temperature data of the second contact surface at a certain point in time is greater than the temperature data of the second contact surface at that point in time, it can be determined that the thermal protection component has triggered thermal runaway of the recipient battery; otherwise, it can be determined that the thermal protection component has not triggered thermal runaway of the recipient battery. Alternatively, since the temperature of the second contact surface will rise rapidly when the recipient battery experiences thermal runaway, the average heating rate of the second contact surface will increase. Therefore, the average heating rate of the second contact surface can be obtained first based on the temperature change data of the second contact surface. If this average heating rate is greater than the thermal runaway of the target battery, but the recipient battery does not experience thermal runaway, the average heating rate of the second contact surface can be used to determine that the thermal protection component has triggered thermal runaway of the recipient battery. Since the temperature of the second contact surface needs to be detected when testing the thermal protection component of the battery, i.e., a temperature sensor needs to be installed on the second contact surface to obtain the temperature, the method of determining the thermal runaway detection result of the recipient battery by using the temperature change data of the second contact surface eliminates the need to install new electronic devices for testing the recipient battery to determine whether thermal runaway has occurred, thereby saving costs.

[0077] To more accurately determine whether the thermal protection component has triggered thermal runaway in the receiver battery, in some embodiments, the thermal runaway detection result of the receiver battery is obtained based on the temperature change data of the second contact surface, including:

[0078] Based on the temperature change data of the second contact surface, the slope of the tangent line to each temperature data in the temperature change data of the second contact surface is obtained.

[0079] The thermal runaway detection results of the receptor battery are obtained based on the tangent slope of each of the temperature data.

[0080] In some embodiments, since the temperature of the second contact surface rises rapidly when the receiver battery experiences thermal runaway, the slope of the temperature change data of the second contact surface also increases. Therefore, after obtaining the temperature change data of the second contact surface, a temperature change curve can be obtained based on this data. Then, the slope of the tangent line at any point on the temperature change curve is taken as the slope of the tangent line for the temperature data corresponding to that point. After obtaining the slopes of each temperature data, the slopes can be compared. If the absolute value of the difference between two slopes is greater than a preset difference, it can be determined that the thermal protection component has triggered thermal runaway of the receiver battery. The preset difference can be determined according to the actual situation. For example, if the target battery experiences thermal runaway but the receiver battery does not, the slopes of the tangent lines for each temperature data in the temperature change data of the second contact surface can be obtained, and the absolute value of the difference between the two slopes with the largest difference can be taken as the preset difference.

[0081] The following describes the battery thermal protection component testing device provided in this application. The battery thermal protection component testing device described below and the battery thermal protection component testing method described above can be referred to in correspondence.

[0082] In one embodiment, such as Figure 6 As shown, a battery thermal protection component testing device is provided for thermal barrier testing of thermal protection components, wherein the thermal protection components are disposed between a target battery and a receiver battery adjacent to the target battery.

[0083] The device includes:

[0084] Temperature change data acquisition module 210 is used to acquire temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery, in response to a prompt signal that triggers thermal runaway of the target battery.

[0085] The thermal protection component detection module 220 is used to obtain the thermal barrier detection result of the thermal protection component based on the temperature change data of the first contact surface and the temperature change data of the second contact surface.

[0086] In response to a warning signal indicating thermal runaway in the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, as well as temperature change data of the second contact surface between the thermal protection component and the recipient battery, are acquired. Based on at least one of the temperature change data of the first and second contact surfaces, the thermal barrier detection result of the thermal protection component is obtained. This allows for the detection of heat transfer by the thermal protection component in the event of thermal runaway, effectively reflecting the thermal barrier effect of the thermal protection component when the battery experiences thermal runaway, and improving the detection accuracy of the thermal protection component for the battery.

[0087] In one embodiment, the temperature change data acquisition module 210 is specifically used for:

[0088] When the contact area between the thermal protection component and the target battery reaches a first preset area, and the contact area between the thermal protection component and the recipient battery reaches a second preset area, in response to the prompt signal that the target battery is triggered to thermal runaway, the temperature change data of the first contact surface between the thermal protection component and the target battery, and the temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired.

[0089] The first preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the target battery, and the second preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the recipient battery.

[0090] In one embodiment, the thermal protection component detection module 220 is specifically used for:

[0091] Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature difference change data between the first contact surface and the second contact surface is obtained.

[0092] Based on the temperature difference change data, the thermal barrier test results of the thermal protection component are obtained.

[0093] In one embodiment, the thermal protection component detection module 220 is specifically used for:

[0094] If the thermal protection component is determined to trigger thermal runaway of the receptor battery, the temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface during a first preset period.

[0095] The first preset time period begins at the moment when the target battery experiences thermal runaway, and the end time of the preset time period is no earlier than the moment when the recipient battery experiences thermal runaway.

[0096] In one embodiment, the thermal protection component detection module 220 is specifically used for:

[0097] Once it is determined that the thermal protection component has not triggered thermal runaway of the receptor battery, the temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface during a second preset period.

[0098] The second preset time period begins when the target battery experiences thermal runaway, and ends when the temperatures of the first contact surface and the second contact surface are the same.

[0099] In one embodiment, the thermal protection component detection module 220 is further configured to:

[0100] Based on the temperature change data of the second contact surface, the thermal runaway detection result of the receptor battery is obtained;

[0101] The thermal runaway detection result includes whether the thermal protection component triggers thermal runaway of the receptor battery, or whether the thermal protection component does not trigger thermal runaway of the receptor battery.

[0102] In one embodiment, the thermal protection component detection module 220 is specifically used for:

[0103] Based on the temperature change data of the second contact surface, the slope of the tangent line to each temperature data in the temperature change data of the second contact surface is obtained.

[0104] The thermal runaway detection results of the receptor battery are obtained based on the tangent slope of each of the temperature data.

[0105] Figure 7 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 7 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 can call a computer program in the memory 830 to execute a method for detecting the thermal protection components of the battery, such as including:

[0106] In response to a warning signal that triggers thermal runaway of the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired;

[0107] The thermal barrier test result of the thermal protection component is obtained based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface.

[0108] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0109] On the other hand, embodiments of this application also provide a storage medium, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the battery thermal protection component detection method provided in the above embodiments, for example including:

[0110] In response to a warning signal that triggers thermal runaway of the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired;

[0111] The thermal barrier test result of the thermal protection component is obtained based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface.

[0112] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0113] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method of detecting a thermal protection component of a battery, characterized by, Used for thermal barrier testing of thermal protection components, wherein the thermal protection components are disposed between a target battery and a receiver battery adjacent to the target battery; The method includes: In response to a warning signal that triggers thermal runaway of the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired; The thermal barrier test result of the thermal protection component is obtained based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface; Based on at least one of the temperature change data of the first contact surface and the temperature change data of the second contact surface, the thermal barrier test result of the thermal protection component is obtained, including: Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature difference change data between the first contact surface and the second contact surface is obtained. Based on the temperature difference change curve corresponding to the temperature difference change data, calculate the integral area of ​​the temperature difference change over time; The thermal barrier test result of the thermal protection component is obtained based on the comparison between the integral area and the preset area.

2. The method of claim 1, wherein In response to a warning signal that triggers thermal runaway of the target battery, temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired, including: When the contact area between the thermal protection component and the target battery reaches a first preset area, and the contact area between the thermal protection component and the recipient battery reaches a second preset area, in response to the prompt signal that the target battery is triggered to thermal runaway, the temperature change data of the first contact surface between the thermal protection component and the target battery, and the temperature change data of the second contact surface between the thermal protection component and the recipient battery are acquired. The first preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the target battery, and the second preset area is determined based on the maximum contact area that can be achieved when the thermal protection component contacts the recipient battery.

3. The method of claim 1, wherein Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature difference change data between the first contact surface and the second contact surface is obtained, including: If the thermal protection component is determined to trigger thermal runaway of the receptor battery, the temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface during a first preset period. The first preset time period begins at the moment when the target battery experiences thermal runaway, and the end time of the preset time period is no earlier than the moment when the recipient battery experiences thermal runaway.

4. The method of claim 1, wherein Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature difference change data between the first contact surface and the second contact surface is obtained, including: Once it is determined that the thermal protection component has not triggered thermal runaway of the receptor battery, the temperature difference change data between the first contact surface and the second contact surface is obtained based on the temperature change data of the first contact surface and the temperature change data of the second contact surface during a second preset period. The second preset time period begins when the target battery experiences thermal runaway, and ends when the temperatures of the first contact surface and the second contact surface are the same.

5. The method according to claim 3 or 4, wherein Also includes: Based on the temperature change data of the second contact surface, the thermal runaway detection result of the receptor battery is obtained; The thermal runaway detection result includes whether the thermal protection component triggers thermal runaway of the receptor battery, or whether the thermal protection component does not trigger thermal runaway of the receptor battery.

6. The method of claim 5, wherein Based on the temperature change data of the second contact surface, the thermal runaway detection results of the acceptor battery are obtained, including: Based on the temperature change data of the second contact surface, the slope of the tangent line to each temperature data in the temperature change data of the second contact surface is obtained. The thermal runaway detection results of the receptor battery are obtained based on the tangent slope of each of the temperature data.

7. A battery thermal protection component detection device, characterized by, Used for thermal barrier testing of thermal protection components, wherein the thermal protection components are disposed between a target battery and a receiver battery adjacent to the target battery; The device includes: The temperature change data acquisition module is used to acquire temperature change data of the first contact surface between the thermal protection component and the target battery, and temperature change data of the second contact surface between the thermal protection component and the recipient battery, in response to a prompt signal that triggers thermal runaway of the target battery. A thermal protection component detection module is used to obtain the thermal barrier detection result of the thermal protection component based on the temperature change data of the first contact surface and the temperature change data of the second contact surface; The thermal protection component detection module is specifically used for: Based on the temperature change data of the first contact surface and the temperature change data of the second contact surface, the temperature difference change data between the first contact surface and the second contact surface is obtained. Based on the temperature difference change curve corresponding to the temperature difference change data, calculate the integral area of ​​the temperature difference change over time; The thermal barrier test result of the thermal protection component is obtained based on the comparison between the integral area and the preset area.

8. An electronic device comprising a processor and a memory having a computer program stored therein, characterized in that, When the processor executes the computer program, it implements the battery thermal protection component detection method according to any one of claims 1 to 6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, When the computer program is executed by the processor, it implements the battery thermal protection component detection method according to any one of claims 1 to 6.

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