Method and device for determining thermal insulation performance of thermal insulation pad, electronic equipment and electric vehicle

Abstract

The embodiment of the application discloses a kind of heat insulation performance determination method, device, electronic equipment and electric automobile of heat insulation pad.The method comprises: obtaining the thermal runaway test data of multiple battery core groups;Wherein, each battery core group includes first battery core, second battery core and heat insulation pad, heat insulation pad is arranged between first battery core and second battery core, first battery core is in thermal runaway state, and thermal runaway test data includes the data that the temperature of second battery core changes with time;According to the initial temperature, the highest temperature and the final temperature of each second battery core in preset time obtained from thermal runaway test data;The heat insulation performance of heat insulation pad is determined from the initial temperature, the highest temperature and the final temperature of each second battery core in preset time using statistical analysis method, to improve the accuracy of determining the heat insulation performance of heat insulation pad, it is also favorable to analyze the heat conduction law in battery core thermal runaway, to provide data support for interpreting battery core thermal runaway heat transfer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery safety, and in particular to a method and device for determining the thermal insulation performance of a thermal insulation pad, an electronic device and an electric vehicle. BACKGROUND

[0002] Thermal runaway protection of the power battery of a new energy vehicle is of the utmost importance, and its thermal safety affects the development of the entire industry. Among them, the thermal insulation pad between the battery cells is a key material for preventing the spread of thermal runaway of the battery cells. However, current research on the thermal insulation pad between the battery cells is relatively small, and the method of material selection is only based on empirical materials and thickness, and there is no reliable data support and thickness boundary exploration. When evaluating whether the thermal insulation pad has thermal spread, it is only determined by temperature-time curve and macroscopically, and the method of determining the thermal insulation performance of the thermal insulation pad is only based on the input of the simulation model, and there is no basis for simulation and actual performance, resulting in a large deviation between the simulation model and the actual performance of thermal runaway.

[0003] Therefore, how to determine the thermal insulation performance of the thermal insulation pad to reduce the large deviation from the actual performance of thermal runaway is a technical problem to be solved at present. SUMMARY

[0004] Embodiments of the present application provide a method and device for determining the thermal insulation performance of a thermal insulation pad, an electronic device and an electric vehicle, aiming to solve the technical problem of poor accuracy of determining the thermal insulation performance of the thermal insulation pad.

[0005] In a first aspect, embodiments of the present application provide a method for determining the thermal insulation performance of a thermal insulation pad, comprising:

[0006] Obtaining thermal runaway test data of a plurality of battery cell groups; wherein each battery cell group comprises a first battery cell, a second battery cell and a thermal insulation pad, the thermal insulation pad is arranged between the first battery cell and the second battery cell, the first battery cell is in a thermal runaway state, and the thermal runaway test data comprises data of the temperature of the second battery cell changing with time;

[0007] According to the thermal runaway test data, obtaining the initial temperature, the maximum temperature and the final temperature of each second battery cell within the preset time;

[0008] Determining the thermal insulation performance of the thermal insulation pad from the initial temperature, the maximum temperature and the final temperature of each second battery cell within the preset time by a statistical analysis method.

[0009] In a second aspect, embodiments of the present application provide a device for determining the thermal insulation performance of a thermal insulation pad, comprising:

[0010] The first obtaining unit is configured to obtain thermal runaway test data of a plurality of battery cell groups, wherein each battery cell group comprises a first battery cell, a second battery cell and a thermal insulation pad, the thermal insulation pad is arranged between the first battery cell and the second battery cell, the first battery cell is in a thermal runaway state, and the thermal runaway test data comprises data of temperature change of the second battery cell over time.

[0011] The second obtaining unit is configured to obtain initial temperature, maximum temperature and final temperature of each second battery cell within the preset time according to the thermal runaway test data.

[0012] The first determining unit is configured to determine the thermal insulation performance of the thermal insulation pad from the initial temperature, the maximum temperature and the final temperature of each second battery cell within the preset time by using a statistical analysis method.

[0013] In a third aspect, an electronic device is provided, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor implements the method for determining the thermal insulation performance of the thermal insulation pad according to the first aspect.

[0014] In a fourth aspect, a computer readable storage medium is provided, wherein the computer readable storage medium stores a computer program, and the computer program, when executed by a processor, causes the processor to perform the method for determining the thermal insulation performance of the thermal insulation pad according to the first aspect.

[0015] In a fifth aspect, an electric vehicle is provided, which comprises the device for determining the thermal insulation performance of the thermal insulation pad according to the second aspect.

[0016] The method for determining the thermal insulation performance of the thermal insulation pad, the device, the electronic device and the electric vehicle provided by the embodiments of the present application can improve the accuracy of determining the thermal insulation performance of the thermal insulation pad, and are also beneficial to analyzing the heat conduction law in the thermal runaway of the battery cell, provide data support for interpreting the heat transfer in the thermal runaway of the battery cell, and can also quantify the thermal insulation performance of the thermal insulation pad, thereby solving the technical problem that different thermal insulation pads cannot be compared horizontally. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 The flowchart of the method for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 1.

[0019] Figure 2 The structural diagram of the battery cell group provided by the embodiments of the present application is shown in FIG. 2.

[0020] Figure 3 The flowchart of the method for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 1.

[0021] Figure 4 The temperature-time curve diagram of the second battery cell under the protection of four different heat insulation pads provided by the embodiments of the present application is shown in FIG. 3.

[0022] Figure 5 The flowchart of the method for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 1.

[0023] Figure 6 The flowchart of the method for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 1.

[0024] Figure 7 The flowchart of the method for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 1.

[0025] Figure 8 The flowchart of the method for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 1.

[0026] Figure 9 The flowchart of the method for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 1.

[0027] Figure 10 The schematic diagram of the device for determining the heat insulation performance of the heat insulation pad provided by the embodiments of the present application is shown in FIG. 6.

[0028] Figure 11 The schematic block diagram of the electronic device provided by the embodiments of the present application is shown in FIG. 7. DETAILED DESCRIPTION

[0029] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of the present application.

[0030] It should be understood that the terms "comprise" and "include" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0031] It should also be understood that the terms used in the present application specification are only for the purpose of describing particular embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should be further understood that the term "and / or" as used in the present application specification and the appended claims means one or more of the associated listed items as well as all possible combinations of the items.

[0033] Please refer to Figure 1 , Figure 1 The flowchart of the method for determining the thermal insulation performance of the thermal insulation pad provided by the embodiments of the present application is shown. The method for determining the thermal insulation performance of the thermal insulation pad provided by the embodiments of the present application is applied to a terminal device, and the method is executed by application software installed in the terminal device. The terminal device can be a desktop computer, a notebook computer, a tablet computer, a mobile phone or other electronic devices.

[0034] The method for determining the thermal insulation performance of the thermal insulation pad will be described in detail below.

[0035] As shown in Figure 1 and Figure 2 , the method comprises the following steps S10-S30.

[0036] S10, obtain thermal runaway test data of a plurality of battery cell groups; wherein each battery cell group comprises a first battery cell L1, a second battery cell L2 and a thermal insulation pad, the thermal insulation pad is arranged between the first battery cell L1 and the second battery cell L2, the first battery cell L1 is in a thermal runaway state, and the thermal runaway test data comprises data of the temperature of the second battery cell changing with time.

[0037] In the embodiment, as shown in Figure 2As shown, each battery cell group includes a first battery cell L1, a second battery cell L2, and a thermal insulation pad arranged between the first battery cell L1 and the second battery cell L2, the first battery cell L1 is in a thermal runaway state, a thermocouple for detecting temperature is arranged on each of the first battery cell L1 and the second battery cell L2, the thickness of the thermal insulation pad before compression can be 1.5 mm, after the thermal insulation pad is arranged in the first battery cell L1 and the second battery cell L2, the thermal insulation pad can be compressed to a specified thickness by using a bolt and a nut, the thermal runaway test data of each battery cell group is the temperature data of the second battery cell L2, that is, by measuring the temperature data of the second battery cell L2 in each battery cell group, the thermal runaway test data of all battery cell groups can be obtained, and then the thermal insulation performance of the thermal insulation pad can be indirectly represented. The temperature data of the second battery cell L2 can be obtained from a log recorder, and the thermocouple on the second battery cell L2 can detect the temperature data of the second battery cell L2 at different times and can be sent to the log recorder. The log recorder is used to record the temperature data of the second battery cell L2 during the entire test process.

[0038] In addition, the number of battery cell groups subjected to the thermal runaway test is 7241 groups, and in order to ensure that the simulated battery cell groups are more in line with the standard, for example, Figure 2 As shown, the battery cell group also includes four battery cells (L3, L4, L5, L6), the four battery cells (L3, L4, L5, L6) are located on the side of the second battery cell L2 away from the first battery cell L1, and a thermal insulation pad is also arranged between the second battery cell L2 and the four battery cells, and corresponding thermocouples are also arranged on the four battery cells, the first battery cell L1, the second battery cell L2, and the four battery cells (L3, L4, L5, L6) are connected in series by welding the tabs.

[0039] In other embodiments, as shown in Figure 2 and Figure 3 As shown, the battery cell group also includes a heating sheet and aerogel, and before step S110, steps S10a and S10b are further included.

[0040] S10a, charging the first battery cell L1 and the second battery cell L2 to a full state of charge;

[0041] S10b, controlling the heating sheet so that the first battery cell L1 is in a thermal runaway state within the preset time.

[0042] In this embodiment, by placing a heating element on the side of the first battery cell L1 away from the second battery cell L2, and controlling the heating element to heat the first battery cell L1, the first battery cell L1 can be brought into a thermal runaway state. Simultaneously, aerogel is disposed on the side of the heating element away from the first battery cell L1, i.e., the heating element is positioned between the aerogel and the first battery cell L1. Furthermore, to improve the accuracy of the thermal insulation performance of the insulation pad, each battery cell in each battery cell group needs to be charged to achieve a fully charged state.

[0043] S20. Based on the thermal runaway test data, obtain the initial temperature, maximum temperature and final temperature of each second cell L2 within the preset time.

[0044] Specifically, the initial temperature is the temperature of the second cell L2 before the first cell L1 is in a thermal runaway state, the maximum temperature is the highest temperature reached by the second cell L2 during the thermal runaway state of the first cell L1, and the final temperature is the temperature of the second cell L2 after the thermal runaway of the first cell L1 ends.

[0045] In this embodiment, a temperature-time curve for each second cell L2 within a preset time period is generated using thermal runaway test data. The initial temperature, maximum temperature, and final temperature of each second cell L2 within the preset time period can then be determined from these temperature-time curves. The preset time period is the time during which the first cell L1 is in a thermal runaway state, and the temperature-time curve is the curve showing the temperature of the second cell L2 changing over time during the thermal runaway state of the first cell L1. By processing the thermal runaway test data for each cell group, the temperature-time curve of the second cell L2 within the preset time period in each cell group can be obtained.

[0046] Please see Figure 4 , Figure 4 The image shows the temperature-time curves of the second cell L2 under four different heat insulation pad protection conditions. Figure 4 As can be seen, when the first cell L1 is in a state of thermal runaway, the temperature of the second cell L2 gradually increases over a certain period of time, and then slowly decreases after reaching a certain temperature. Therefore, by using the temperature-time curve of each second cell L2 within a preset time, the initial temperature, maximum temperature, and final temperature of each second cell L2 within the preset time can be obtained.

[0047] S30. The heat insulation performance of the heat insulation pad is determined by using statistical analysis methods from the initial temperature, maximum temperature and final temperature of each second cell L2 within the preset time.

[0048] Specifically, after obtaining the initial temperature, the highest temperature and the final temperature of each second battery cell L2 within the preset time, the statistical analysis method can accurately screen the data for evaluating the heat insulation performance of the heat insulation pad from the initial temperature, the highest temperature and the final temperature of each second battery cell L2 within the preset time, so as to realize the quantification of the heat insulation performance of the heat insulation pad, and further solve the technical problem that different heat insulation pads cannot be compared horizontally.

[0049] In other embodiments of the application, as shown in Figure 5 Step S40 includes steps S401 and S402.

[0050] S401, determining the final initial temperature, the highest temperature and the final temperature of the second battery cell L2 from the initial temperature, the highest temperature and the final temperature of each second battery cell L2 within the preset time by using the median method;

[0051] S402, determining the heat insulation performance of the heat insulation pad according to the final initial temperature, the highest temperature and the final temperature of the second battery cell L2.

[0052] Specifically, the median method refers to arranging each variable value in the statistical population in order of size to form a sequence, and taking the variable value at the middle position in the variable sequence as the median, wherein when the number N of variable values is odd, the variable value at the middle position is the median; when N is even, the median is the average of the two variable values at the middle position.

[0053] In this embodiment, by arranging the initial temperature, the highest temperature and the final temperature of each second battery cell L2 within the preset time in order from large to small, respectively forming a sequence, and then taking the value at the middle position in each sequence as the final initial temperature, the highest temperature and the final temperature of the second battery cell L2, and finally performing corresponding processing on the final initial temperature, the highest temperature and the final temperature of the second battery cell L2, the heat insulation performance data of the heat insulation pad can be obtained.

[0054] In other embodiments of the application, as shown in Figure 6 Step S142 includes steps S4021, S4022 and S4023.

[0055] S4021, determining the temperature difference of the second battery cell L2 under the protection of the heat insulation pad according to the final initial temperature and the highest temperature of the second battery cell L2;

[0056] S4022, determining the temperature drop of the second battery cell L2 under the protection of the heat insulation pad according to the final highest temperature and the final temperature of the second battery cell L2;

[0057] S4023, generating the thermal insulation performance of the thermal insulation pad according to the final highest temperature of the second battery cell L2, the temperature difference of the second battery cell L2 under the protection of the thermal insulation pad, and the temperature drop.

[0058] In the embodiment, the thermal insulation performance of the thermal insulation pad includes the temperature difference of the second battery cell L2 under the protection of the thermal insulation pad, the temperature drop, and the final highest temperature of the second battery cell L2. The temperature difference of the second battery cell L2 under the protection of the thermal insulation pad can be obtained by subtracting the initial temperature of the second battery cell L2 from the final highest temperature of the second battery cell L2, and the temperature drop of the second battery cell L2 under the protection of the thermal insulation pad can be obtained by subtracting the final temperature of the second battery cell L2 from the final highest temperature of the second battery cell L2.

[0059] In other embodiments of the application, as shown in Figure 7 S40 includes steps S41 and S42.

[0060] S41, obtaining the temperature rise rate of each second battery cell L2 according to the thermal runaway test data;

[0061] S42, determining the thermal insulation performance of the thermal insulation pad according to the Sumproduct function, the temperature rise rate of each second battery cell L2, and the initial temperature, the highest temperature, and the final temperature of each second battery cell L2 within the preset time.

[0062] In the embodiment, the thermal insulation performance of the thermal insulation pad further includes the total temperature rise of the second battery cell L2, which is obtained by corresponding calculation of the Sumproduct function. The total temperature rise of the second battery cell L2 can further improve the evaluation of the thermal insulation performance of the thermal insulation pad. Meanwhile, the temperature rise rate of each second battery cell L2 can be obtained by generating a corresponding temperature-time curve from the thermal runaway test data, and then the temperature-time curve can be used to obtain the temperature rise rate of each second battery cell L2.

[0063] After obtaining the temperature rise rate of each second battery cell L2, the second battery cells L2 can be classified by the temperature rise rate to divide the second battery cells L2 into different temperature rise rate intervals, and then the Sumproduct function is used for corresponding calculation to obtain the total temperature rise of the second battery cell L2. The Sumproduct function is used to multiply the corresponding elements between the given arrays and return the sum of the products.

[0064] In addition, the temperature rise rate of the second battery cell L2 can be obtained by derivation from the initial temperature to the highest temperature of the second battery cell L2, but is not limited thereto.

[0065] In other embodiments of the application, as shown in Figure 8As shown, step S42 includes steps S421, S422, S423 and S424.

[0066] S421, determining the temperature rise rate interval of each second battery cell L2 according to the temperature rise rate;

[0067] S422, determining the number proportion of the second battery cell L2 in each temperature rise rate interval and the highest temperature by using a statistical analysis method;

[0068] S423, processing the number proportion of the second battery cell L2 in each temperature rise rate interval and the highest temperature according to the Sumproduct function to obtain the total temperature rise of the second battery cell L2;

[0069] S424, determining the heat insulation performance of the heat insulation pad according to the total temperature rise, the final initial temperature, the highest temperature and the final temperature of the second battery cell L2.

[0070] Specifically, the temperature rise rate interval is the level of the temperature rise rate of each second battery cell L2 under the thermal runaway state of the first battery cell L1. The temperature rise rate interval can be pre-divided according to actual experience, or can be divided after obtaining the temperature rise rate of each second battery cell L2. The specific division method can be selected according to actual application, which is not limited in the embodiment.

[0071] In the embodiment, the temperature rise rate of the second battery cell L2 can be divided into five temperature rise rate intervals: 0℃ or below, 0-0.1℃, 0.1-0.2℃, 0.2-0.3℃ and 0.3℃ or above. Then, the number of the second battery cell L2 in each temperature rise rate interval is counted, and the proportion is calculated. Then, the number proportion of the second battery cell L2 in each temperature rise rate interval and the highest temperature are processed according to the Sumproduct function to obtain the total temperature rise of the second battery cell L2. Finally, the total temperature rise of the second battery cell L2, the final initial temperature, the highest temperature and the final temperature of the second battery cell L2 can be used to determine the heat insulation performance of the heat insulation pad.

[0072] In the embodiment, the number of the battery cell group of the thermal runaway test is 7241 groups. Among them, the number of the second battery cell L2 at 0℃ or below is 6302, the number of the second battery cell L2 in the 0-0.1℃ interval is 427, the number of the second battery cell L2 in the 0.1-0.2℃ interval is 496, the number of the second battery cell L2 in the 0.2-0.3℃ interval is 16, and the number of the second battery cell L2 at 0.3℃ or above is 0.

[0073] In other embodiments of the application, as shown in FIG. 6, step S422 includes steps S4221 and S4222. Figure 9

[0074] ​S4221, obtaining a quantity proportion of the second battery cell L2 in each of the temperature rising rate intervals;

[0075] S4222, determining the highest temperature of the second battery cell L2 in each of the temperature rising rate intervals from all the highest temperatures of the second battery cell L2 in each of the temperature rising rate intervals by using a median method.

[0076] In the embodiment, the quantity proportion of the second battery cell L2 in each of the temperature rising rate intervals can be obtained by dividing the number of the second battery cell L2 in each of the temperature rising rate intervals by the number of the battery cell groups in the thermal runaway test. After obtaining the quantity proportion of the second battery cell L2 in each of the temperature rising rate intervals, the highest temperature of the second battery cell L2 in each of the temperature rising rate intervals is determined by using a median method, which is used in the calculation of the Sumproduct function, so that the total temperature rise of the second battery cell L2 can be calculated more accurately. The calculation formula of the total temperature rise is: T=N1*n1+N2*n2+…Ni*ni, wherein n1, n2, …, ni are the quantity proportions of the second battery cell L2 in each of the temperature rising rate intervals, i is the number of the temperature rising rate interval, and N1, N2, …, Ni are the highest temperatures of the second battery cell L2 in each of the temperature rising rate intervals.

[0077] In addition, when it is necessary to select the heat insulation pad with the optimal heat insulation performance from a plurality of heat insulation pads, each heat insulation pad can be processed by using the heat insulation performance determination method of the heat insulation pad provided in the application. During the processing, the proportions of the heat insulation pads in different temperature rising rate intervals can be displayed in a pie chart, or the heat insulation pads can be compared and displayed in a column chart, so that the heat insulation pads can be compared horizontally, and the heat insulation performance of the heat insulation pads can be evaluated more conveniently.

[0078] In the heat insulation performance determination method of the heat insulation pad provided in the embodiment, the thermal runaway test data of a plurality of battery cell groups are obtained, each of the battery cell groups includes a first battery cell L1, a second battery cell L2 and a heat insulation pad, the heat insulation pad is arranged between the first battery cell L1 and the second battery cell L2, the first battery cell L1 is in a thermal runaway state, and the thermal runaway test data include data of the temperature change of the second battery cell with time. The initial temperature, the highest temperature and the final temperature of each of the second battery cells L2 within the preset time are obtained according to the thermal runaway test data. The heat insulation performance of the heat insulation pad is determined from the initial temperature, the highest temperature and the final temperature of each of the second battery cells L2 within the preset time by using a statistical analysis method. The application improves the accuracy of determining the heat insulation performance of the heat insulation pad, is also beneficial to analyzing the heat conduction law in the thermal runaway of the battery cell, provides data support for interpreting the heat transfer in the thermal runaway of the battery cell, and can also quantify the heat insulation performance of the heat insulation pad, thereby solving the technical problem that different heat insulation pads cannot be compared horizontally.

[0079] The application further provides a device 100 for determining the heat insulation performance of a heat insulation pad, which is used to execute any of the aforementioned embodiments of the method for determining the heat insulation performance of a heat insulation pad.

[0080] Specifically, refer to Figure 10 , Figure 10 FIG. 1 is a schematic block diagram of the device 100 for determining the heat insulation performance of a heat insulation pad provided by the application.

[0081] As shown in Figure 10 , the device 100 for determining the heat insulation performance of a heat insulation pad comprises a first obtaining unit 10, a second obtaining unit 20 and a first determining unit 30.

[0082] The first obtaining unit 10 is configured to obtain thermal runaway test data of a plurality of battery cell groups, wherein each battery cell group comprises a first battery cell L1, a second battery cell L2 and a heat insulation pad, the heat insulation pad is arranged between the first battery cell L1 and the second battery cell L2, the first battery cell L1 is in a thermal runaway state, and the thermal runaway test data comprises data of the temperature of the second battery cell changing over time.

[0083] In other embodiments of the application, the battery cell group further comprises a heating sheet and aerogel, and the device 100 for determining the heat insulation performance of a heat insulation pad further comprises a charging unit and a control unit.

[0084] The charging unit is configured to charge the first battery cell L1 and the second battery cell L2 to a full state of charge, and the control unit is configured to control the heating sheet to make the first battery cell L1 in a thermal runaway state within a preset time.

[0085] The second obtaining unit 20 is configured to obtain, according to the thermal runaway test data, an initial temperature, a maximum temperature and a final temperature of each second battery cell L2 within the preset time.

[0086] The first determining unit 30 is configured to determine the heat insulation performance of the heat insulation pad from the initial temperature, the maximum temperature and the final temperature of each second battery cell L2 within the preset time by using a statistical analysis method.

[0087] In other embodiments of the application, the first determining unit 40 comprises a second determining unit and a third determining unit.

[0088] The second determining unit is configured to determine the final initial temperature, the maximum temperature and the final temperature of the second battery cell L2 from the initial temperature, the maximum temperature and the final temperature of each second battery cell L2 within the preset time by using a median method, and the third determining unit is configured to determine the heat insulation performance of the heat insulation pad according to the final initial temperature, the maximum temperature and the final temperature of the second battery cell L2.

[0089] In other embodiments of the application, the third determining unit comprises a fourth determining unit, a fifth determining unit and a second generating unit.

[0090] The fourth determining unit is configured to determine a temperature difference of the second battery cell L2 under protection of the thermal insulation pad according to the final initial temperature and the final maximum temperature of the second battery cell L2; the fifth determining unit is configured to determine a temperature drop of the second battery cell L2 under protection of the thermal insulation pad according to the final maximum temperature and the final temperature of the second battery cell L2; and the second generating unit is configured to generate the thermal insulation performance of the thermal insulation pad according to the final maximum temperature of the second battery cell L2, the temperature difference and the temperature drop of the second battery cell L2 under protection of the thermal insulation pad.

[0091] In other embodiments of the application, the first determining unit 40 comprises a third obtaining unit and a sixth determining unit.

[0092] The third obtaining unit is configured to obtain a temperature rising rate of each second battery cell L2 according to the thermal runaway test data; and the sixth determining unit is configured to determine the thermal insulation performance of the thermal insulation pad according to the Sumproduct function, the temperature rising rate of each second battery cell L2, and the initial temperature, the maximum temperature and the final temperature of each second battery cell L2 within the preset time.

[0093] In other embodiments of the application, the sixth determining unit comprises a seventh determining unit, an eighth determining unit, a processing unit and a ninth determining unit.

[0094] The seventh determining unit is configured to determine a temperature rising rate interval of each second battery cell L2 according to the temperature rising rate; the eighth determining unit is configured to determine a quantity proportion and a maximum temperature of the second battery cell L2 in each temperature rising rate interval by using a statistical analysis method; the processing unit is configured to process the quantity proportion and the maximum temperature of the second battery cell L2 in each temperature rising rate interval according to the Sumproduct function, to obtain a total temperature rising of the second battery cell L2; and the ninth determining unit is configured to determine the thermal insulation performance of the thermal insulation pad according to the total temperature rising, the initial temperature, the maximum temperature and the final temperature of the second battery cell L2.

[0095] In other embodiments of the application, the eighth determining unit comprises a fourth obtaining unit and a tenth determining unit.

[0096] The fourth obtaining unit is configured to obtain the quantity proportion of the second battery cell L2 in each temperature rising rate interval; and the tenth determining unit is configured to determine the maximum temperature of the second battery cell L2 in each temperature rising rate interval from all the maximum temperatures of the second battery cell L2 in each temperature rising rate interval by using a median method.

[0097] The heat insulation performance determination device 100 of the heat insulation pad provided by the embodiment of the application is used to execute the above-mentioned acquisition of the thermal runaway test data of a plurality of battery cell groups, wherein each of the battery cell groups comprises a first battery cell L1, a second battery cell L2 and a heat insulation pad, the heat insulation pad is arranged between the first battery cell L1 and the second battery cell L2, the first battery cell L1 is in a thermal runaway state, and the thermal runaway test data comprises data of temperature change of the second battery cell with time; the initial temperature, the highest temperature and the final temperature of each of the second battery cells L2 within the preset time are acquired according to the thermal runaway test data; and the heat insulation performance of the heat insulation pad is determined from the initial temperature, the highest temperature and the final temperature of each of the second battery cells L2 within the preset time by using a statistical analysis method.

[0098] In other embodiments of the application, the application further provides an electric vehicle comprising the heat insulation performance determination device 100 of the heat insulation pad in the above-mentioned embodiments. In the electric vehicle, a plurality of battery cell groups and a tool for performing thermal runaway test on the plurality of battery cell groups are further included, and the heat insulation performance determination device 100 of the heat insulation pad can execute the heat insulation performance determination method of the heat insulation pad in the process of performing thermal runaway test on the plurality of battery cell groups by the tool.

[0099] Please refer to Figure 11 , Figure 11 is a schematic block diagram of an electronic device provided by the embodiment of the application.

[0100] Please refer to Figure 11 The device 500 comprises a processor 502, a memory and a network interface 505 connected through a system bus 501, wherein the memory can comprise a storage medium 503 and an internal memory 504.

[0101] The storage medium 503 can store an operating system 5031 and a computer program 5032. The computer program 5032, when executed, can make the processor 502 execute the heat insulation performance determination method of the heat insulation pad.

[0102] The processor 502 is used to provide computing and control capabilities to support the operation of the entire device 500.

[0103] The internal memory 504 provides an environment for the execution of the computer program 5032 in the non-volatile storage medium 503, and the computer program 5032, when executed by the processor 502, can make the processor 502 execute the heat insulation performance determination method of the heat insulation pad.

[0104] The network interface 505 is used for network communication, such as providing transmission of data information, etc. Those skilled in the art can understand that Figure 11The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the device 500 to which the scheme of the present application is applied. The specific device 500 can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0105] The processor 502 is configured to run the computer program 5032 stored in the memory to acquire thermal runaway test data of a plurality of cell groups, wherein each cell group includes a first cell L1, a second cell L2 and a thermal insulation pad, the thermal insulation pad is arranged between the first cell L1 and the second cell L2, the first cell L1 is in a thermal runaway state, and the thermal runaway test data includes data of temperature change of the second cell over time; acquire initial temperature, maximum temperature and final temperature of each second cell L2 within a preset time according to the thermal runaway test data; and determine the thermal insulation performance of the thermal insulation pad from the initial temperature, the maximum temperature and the final temperature of each second cell L2 within the preset time by using a statistical analysis method.

[0106] Those skilled in the art can understand that Figure 11 The embodiments of the device 500 shown in the figure do not constitute a limitation on the specific constitution of the device 500. In other embodiments, the device 500 can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. For example, in some embodiments, the device 500 can only include the memory and the processor 502. In such embodiments, the structure and functions of the memory and the processor 502 are consistent with those of the memory and the processor 502 in the embodiments shown in the figure, and will not be described here again. Figure 11

[0107] It should be understood that, in the embodiments of the present application, the processor 502 can be a central processing unit (CPU), and the processor 502 can also be other general-purpose processors 502, digital signal processors 502 (DSP), application specific integrated circuits (ASIC), ready programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor 502 can be a microprocessor or any conventional processor 502, etc.

[0108] ​In another embodiment of the present application, a computer storage medium is provided. The storage medium can be a non-volatile computer readable storage medium or a volatile computer readable storage medium. The storage medium stores a computer program 5032, wherein the computer program 5032, when executed by the processor 502, implements the following steps: obtaining thermal runaway test data of a plurality of battery cell groups; wherein each of the battery cell groups comprises a first battery cell L1, a second battery cell L2, and a thermal insulation pad, the thermal insulation pad is arranged between the first battery cell L1 and the second battery cell L2, the first battery cell L1 is in a thermal runaway state, and the thermal runaway test data comprises data of a temperature of the second battery cell changing over time; obtaining an initial temperature, a maximum temperature, and a final temperature of each of the second battery cells L2 within the preset time according to the thermal runaway test data; and determining a thermal insulation performance of the thermal insulation pad from the initial temperature, the maximum temperature, and the final temperature of each of the second battery cells L2 within the preset time by using a statistical analysis method.

[0109] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices, apparatuses and units can refer to the corresponding processes in the foregoing method embodiments, which will not be described here. Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in a general manner in the foregoing description. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0110] In several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are only schematic. For example, the division of the units is only a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can also be electrical, mechanical or other forms of connection.

[0111] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment of the present application.

[0112] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0113] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that contributes to the present application, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing an apparatus 500 (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a magnetic disk or an optical disk, and various program code storage media.

[0114] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for determining the thermal insulation performance of a thermal insulation pad, characterized in that, include: Acquire thermal runaway test data for multiple battery cell groups; wherein each battery cell group includes a first battery cell, a second battery cell, and a thermal insulation pad, the thermal insulation pad being disposed between the first battery cell and the second battery cell, the first battery cell being in a thermal runaway state, and the thermal runaway test data including data on the temperature change of the second battery cell over time; The initial temperature, maximum temperature, and final temperature of each second cell within a preset time period are obtained based on the thermal runaway test data; the preset time period is the time period during which the first cell is in a thermal runaway state. The thermal insulation performance of the thermal insulation pad is determined by statistical analysis methods from the initial temperature, maximum temperature and final temperature of each second cell within the preset time. The method of determining the thermal insulation performance of the thermal insulation pad from the initial temperature, maximum temperature and final temperature of each second cell within the preset time using statistical analysis methods includes: obtaining the heating rate of each second cell based on the thermal runaway test data; and determining the thermal insulation performance of the thermal insulation pad based on the Sumproduct function, the heating rate of each second cell and the initial temperature, maximum temperature and final temperature of each second cell within the preset time. The step of determining the thermal insulation performance of the heat insulation pad based on the Sumproduct function, the heating rate of each second battery cell, and the initial, maximum, and final temperatures of each second battery cell within the preset time period includes: determining the heating rate range of each second battery cell based on the heating rate; determining the proportion of second battery cells and the maximum temperature within each heating rate range using statistical analysis methods; processing the proportion of second battery cells and the maximum temperature within each heating rate range using the Sumproduct function to obtain the total temperature rise of the second battery cells; and determining the thermal insulation performance of the heat insulation pad based on the total temperature rise, the final initial temperature, the maximum temperature, and the final temperature of the second battery cells.

2. The method for determining the thermal insulation performance of the thermal insulation pad according to claim 1, characterized in that, The battery cell assembly also includes a heating element and an aerogel, wherein the first battery cell is disposed between the heating element and the heat insulation pad, and the heating element is disposed between the first heat insulation pad and the aerogel; Prior to acquiring thermal runaway test data for multiple battery cell groups, the process also includes: Charge the first battery cell and the second battery cell to full charge. The heating element is controlled so that the first battery cell is in a thermal runaway state within the preset time.

3. The method for determining the thermal insulation performance of the thermal insulation pad according to claim 1, characterized in that, The determination of the thermal insulation performance of the thermal insulation pad using statistical analysis methods from the initial temperature, maximum temperature, and final temperature of each of the second cells within the preset time period includes: The median method is used to determine the final initial temperature, maximum temperature, and final temperature of each second cell from the initial temperature, maximum temperature, and final temperature of each second cell within the preset time period; The thermal insulation performance of the thermal insulation pad is determined based on the initial temperature, maximum temperature, and final temperature of the second battery cell.

4. The method for determining the thermal insulation performance of the thermal insulation pad according to claim 3, characterized in that, Determining the thermal insulation performance of the thermal insulation pad based on the initial temperature, maximum temperature, and final temperature of the second battery cell includes: The temperature difference of the second battery cell under the protection of the heat insulation pad is determined based on the final initial temperature and the highest temperature of the second battery cell. The temperature drop of the second battery cell under the protection of the heat insulation pad is determined based on the final maximum temperature and the final temperature of the second battery cell. The thermal insulation performance of the thermal insulation pad is determined based on the final maximum temperature of the second battery cell, the temperature difference of the second battery cell under the protection of the thermal insulation pad, and the temperature drop.

5. The method for determining the thermal insulation performance of the thermal insulation pad according to claim 1, characterized in that, The method of determining the proportion of the second battery cells and the highest temperature within each heating rate range using statistical analysis includes: Obtain the percentage of the number of the second battery cells within each of the stated heating rate intervals; The median method is used to determine the highest temperature of the second cell in each heating rate interval from the highest temperature of all the second cells in each heating rate interval.

6. A device for determining the thermal insulation performance of a thermal insulation pad, characterized in that, include: The first acquisition unit is used to acquire thermal runaway test data of multiple battery cell groups; wherein each battery cell group includes a first battery cell, a second battery cell, and a thermal insulation pad, the thermal insulation pad being disposed between the first battery cell and the second battery cell; the first battery cell is in a thermal runaway state, and the thermal runaway test data includes data on the temperature change of the second battery cell over time; The second acquisition unit is used to acquire the initial temperature, maximum temperature and final temperature of each second cell within a preset time according to the thermal runaway test data; the preset time is the time period during which the first cell is in a thermal runaway state; The first determining unit is used to determine the heat insulation performance of the heat insulation pad from the initial temperature, maximum temperature and final temperature of each of the second cells within the preset time using statistical analysis methods. The first determining unit includes a third acquiring unit and a sixth determining unit; the third acquiring unit is used to acquire the heating rate of each second cell based on the thermal runaway test data; the sixth determining unit is used to determine the thermal insulation performance of the thermal insulation pad based on the Sumproduct function, the heating rate of each second cell, and the initial temperature, maximum temperature, and final temperature of each second cell within the preset time. The sixth determining unit includes a seventh determining unit, an eighth determining unit, a processing unit, and a ninth determining unit; the seventh determining unit is used to determine the heating rate range of each second battery cell according to the heating rate; the eighth determining unit is used to determine the proportion of the number of second battery cells and the highest temperature in each heating rate range using statistical analysis methods; the processing unit is used to process the proportion of the number of second battery cells and the highest temperature in each heating rate range according to the Sumproduct function to obtain the total temperature rise of the second battery cells; the ninth determining unit is used to determine the thermal insulation performance of the thermal insulation pad according to the total temperature rise, the final initial temperature, the highest temperature, and the final temperature of the second battery cells.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for determining the thermal insulation performance of the thermal insulation pad as described in any one of claims 1 to 5.

8. An electric vehicle, characterized in that, Includes the thermal insulation performance determination device as described in claim 6.

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