Battery thermal diffusion testing device and system

Abstract

The invention relates to a battery thermal diffusion testing device and system. A shell assembly in the device is provided with an accommodating cavity, and a first detection module is arranged in a target battery cell; the second detection modules are arranged on adjacent battery cells in a one-to-one correspondence manner; the fixing assembly is installed in the containing cavity, the second fixing area of the fixing assembly is arranged around the first fixing area, the first fixing area is used for fixing the target battery cell, and the second fixing area is used for fixing the adjacent battery cells, so that a thermal diffusion test is conducted on the to-be-tested battery pack, and when the thermal diffusion test is started, the characteristic data of the target battery cell can be detected through the first detection module; and detecting the characteristic data of the corresponding adjacent battery cell through a second detection module, and judging whether the battery pack to be detected has heat diffusion according to the characteristic data of the target battery cell and the characteristic data of the adjacent battery cell, after the test is completed, the fixing assembly can be conveniently disassembled, the battery pack to be tested can be rapidly taken out, the disassembly and assembly process of the test sample is simplified, the test cost is reduced, and the test universality is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery thermal diffusion test device and system. Background Art

[0002] After any single cell in a battery pack undergoes thermal runaway, the released heat and high-temperature substances spread to adjacent cells, easily triggering a chain thermal runaway, that is, the phenomenon of battery thermal diffusion occurs. Battery thermal diffusion not only causes damage to the battery pack but also seriously threatens the personal safety of users. Battery thermal diffusion testing is an important means to evaluate the safety performance of batteries. The relevant parameters such as battery temperature and gas production pressure obtained from the test results can visually characterize the battery thermal diffusion characteristics.

[0003] Currently, in existing battery thermal diffusion test devices, the disassembly and assembly process of test samples is cumbersome, the test cost is high, and the test versatility is poor. Summary of the Invention

[0004] Based on this, a battery thermal diffusion test device and system are provided.

[0005] In a first aspect, this application provides a battery thermal diffusion test device, including:

[0006] A housing assembly, the housing assembly is provided with a receiving cavity for receiving a battery pack to be tested, and the battery pack to be tested includes a target cell and a plurality of adjacent cells;

[0007] A detection component, the detection component includes a first detection module and a plurality of second detection modules. The first detection module is arranged on the target cell; each second detection module is correspondingly arranged on each adjacent cell;

[0008] A fixing component, the fixing component is installed in the receiving cavity, the fixing component is provided with a first fixing area and a second fixing area, the second fixing area surrounds the first fixing area, the first fixing area is used to fix the target cell, and the second fixing area is used to fix each adjacent cell.

[0009] In one of the embodiments, the fixing component includes a first support plate, a first fixing plate, and a first fastener group;

[0010] The first support plate is provided with a first main through groove and a plurality of first secondary through grooves, and each first secondary through groove surrounds the first main through groove; the first main through groove is used to limit the bottom of the target cell, and the first secondary through groove is used to limit the bottom of the corresponding adjacent cell;

[0011] The first fixing plate is provided with a second main through groove and a plurality of second secondary through grooves, and each second secondary through groove surrounds the second main through groove; the second main through groove is used to limit the top of the target cell, and the second secondary through groove is used to limit the top of the corresponding adjacent cell;

[0012] The first fastener group is detachably arranged between the first support plate and the first fixing plate to lock or loosen the target battery cell and each adjacent battery cell.

[0013] In one embodiment, a first annular boss is arranged in the first main through groove, and the first annular boss is used to abut against the bottom surface of the target battery cell. A second annular boss is arranged in the first secondary through groove, and the second annular boss is used to abut against the bottom surface of the corresponding adjacent battery cell;

[0014] A third annular boss is arranged in the second main through groove, and the third annular boss is used to abut against the top surface of the target battery cell. A fourth annular boss is arranged in the second secondary through groove, and the fourth annular boss is used to abut against the top surface of the corresponding adjacent battery cell.

[0015] In one embodiment, the first main through groove has opposite first and second ports. The size of the first port of the first main through groove is larger than the size of the second port of the first main through groove, and the size of the second port of the first main through groove is larger than the size of the explosion-proof valve of the target battery cell; the first secondary through groove has opposite first and second ports. The size of the first port of the first secondary through groove is larger than the size of the second port of the first secondary through groove, and the size of the second port of the first secondary through groove is larger than the size of the explosion-proof valve of the corresponding adjacent battery cell;

[0016] The second main through groove has opposite first and second ports. The size of the first port of the second main through groove is larger than the size of the second port of the second main through groove, and the size of the second port of the second main through groove is smaller than the top surface size of the target battery cell; the second secondary through groove has opposite first and second ports. The size of the first port of the second secondary through groove is larger than the size of the second port of the second secondary through groove, and the size of the second port of the second secondary through groove is smaller than the top surface size of the corresponding adjacent battery cell.

[0017] In one embodiment, the first fixing plate is provided with a plurality of first wire harness through holes and a plurality of first wire grooves; each first wire harness through hole and each first wire groove are arranged in one-to-one correspondence;

[0018] The connecting wire harness of the second detection module passes through the corresponding first wire harness through hole and is placed in the corresponding first wire groove.

[0019] In one embodiment, the fixing assembly further includes a second fixing plate and a plurality of first support columns; the second fixing plate is arranged on the first fixing plate, and the first support columns are arranged at intervals between the first fixing plate and the second fixing plate; the first fastener group is detachably arranged on the first support plate, the first fixing plate and the second fixing plate;

[0020] The second fixing plate is provided with a second wire harness through hole and a second wire groove; the connecting wire harness of the first detection module passes through the second wire harness through hole and is placed in the second wire groove.

[0021] In one embodiment, the fixing component further includes a positive connection component and a negative connection component; the second fixing plate is provided with a first connection through hole and a second connection through hole, and the top surface of the target battery cell has a positive terminal and a negative terminal;

[0022] The positive connection component is arranged on the second fixing plate. The first end of the positive connection component passes through the first connection through hole and abuts against the positive terminal of the target battery cell, and the second end of the positive connection component is used for connecting an external power supply device; the negative connection component is arranged on the second fixing plate. The first end of the negative connection component passes through the second connection through hole and abuts against the negative terminal of the target battery cell, and the second end of the negative connection component is used for connecting an external power supply device.

[0023] In one embodiment, the second fixing plate is provided with a mounting hole, and the mounting hole is used for arranging an insulating seat, and the insulating seat is provided with a first connection through hole and a second connection through hole;

[0024] The positive connection component includes a first conductive slide bar, a first connection piece and a second fastener; a third connection through hole is arranged at the first end of the first connection piece, a fourth connection through hole is arranged at the second end of the first connection piece, and the fourth connection through hole is used for connecting an external power supply device; a first connection head and a first support seat are arranged at the first end of the first conductive slide bar, and a second connection head is arranged at the second end of the first conductive slide bar; the first end of the first conductive slide bar passes through the first connection through hole and the third connection through hole, and is locked to the first connection head through the second fastener, so that the first end of the first connection piece is locked to the first support seat; the second connection head is used for abutting against the positive terminal of the target battery cell;

[0025] The negative connection component includes a second conductive slide bar, a second connection piece and a third fastener; a fifth connection through hole is arranged at the first end of the second connection piece, a sixth connection through hole is arranged at the second end of the second connection piece, and the sixth connection through hole is used for connecting an external power supply device; a third connection head and a second support seat are arranged at the first end of the second conductive slide bar, and a fourth connection head is arranged at the second end of the second conductive slide bar; the first end of the second conductive slide bar passes through the second connection through hole and the fifth connection through hole, and is locked to the third connection head through the third fastener, so that the first end of the second connection piece is locked to the second support seat; the fourth connection head is used for abutting against the negative terminal of the target battery cell.

[0026] In one embodiment, the positive connection component is further provided with a first annular elastic member, and a first insulating layer is arranged on the rod body of the first conductive slide bar; the insulating seat is used for moving along the first conductive slide bar; the first annular elastic member is sleeved on the rod body of the first conductive slide bar, the first end of the first annular elastic member is used for abutting against the second connection head, and the second end of the first annular elastic member is used for abutting against the second fixing plate;

[0027] The negative electrode connection assembly is further provided with a second annular elastic member, and the rod body of the second conductive sliding rod is provided with a second insulating layer; the insulating seat is further configured to move along the second conductive sliding rod; the second annular elastic member is sleeved on the rod body of the second conductive sliding rod, the first end of the second annular elastic member is configured to abut against the fourth connection head, and the second end of the second annular elastic member is configured to abut against the second fixing plate.

[0028] In one embodiment, the housing assembly includes a box body main body and a cover body; the cover body and the box body main body enclose to form a receiving cavity;

[0029] The box body main body is provided with a second support plate and a third support plate; the fixing assembly is installed on the second support plate, the second support plate and the third support plate are spaced apart, and the second support plate, the third support plate and the side plate of the box body main body enclose to form a pressure relief cavity.

[0030] In one embodiment, the second support plate is provided with a pressure relief hole, and the pressure relief hole is provided corresponding to the explosion-proof valves of the target battery cell and each adjacent battery cell;

[0031] A separator is arranged between the second support plate and the third support plate, and the separator is used for sealing the pressure relief hole; the separator is also used for conducting the pressure relief hole when the target battery cell or an adjacent battery cell has a thermal runaway.

[0032] In one embodiment, a plurality of second support columns are further arranged between the first support plate and the second support plate;

[0033] The second support columns are used for adjusting the distance between the first support plate and the second support plate so as to adjust the height of the pressure relief cavity.

[0034] In one embodiment, the box body main body is further provided with a pressure relief channel and a pressure relief valve; the pressure relief channel communicates with the pressure relief cavity, and the pressure relief valve is used for communicating with the pressure relief channel.

[0035] In one embodiment, a plurality of reinforcing ribs are arranged in the pressure relief channel to divide the pressure relief channel into a plurality of pressure relief sub-channels;

[0036] The reinforcing ribs are provided with a plurality of gas through holes to communicate the pressure relief sub-channels.

[0037] In one embodiment, the box body main body is further provided with a detection through hole, and the detection through hole communicates with the pressure relief channel; a pressure sensor is arranged on the detection through hole, and the pressure sensor is used for connecting an external processing device.

[0038] In one embodiment, the box body main body is further provided with a third wire harness through hole;

[0039] The connection wire harness of the first detection module and the connection wire harnesses of the second detection modules respectively pass through the third wire harness through hole and are respectively connected to an external processing device.

[0040] In one embodiment, the first detection module includes a first voltage sensor and a plurality of first temperature sensors; the second detection module includes a second voltage sensor and a plurality of second temperature sensors;

[0041] Each first temperature sensor is disposed on the target battery cell, and the first voltage sensor is connected to the target battery cell; each second temperature sensor is disposed on the corresponding adjacent battery cell, and the second voltage sensor is connected to the adjacent battery cell.

[0042] In one embodiment, the first detection module further includes a heating sheet and a heat insulation sheet;

[0043] The heating sheet is disposed on the side surface of the target battery cell, and the heating sheet is used to connect to an external power supply device; the heat insulation sheet is disposed to cover the heating sheet.

[0044] In a second aspect, the present application further provides a battery thermal diffusion test system, including an external processing device, an external power supply device, and a battery thermal diffusion test device as described in any one of the above;

[0045] The battery thermal diffusion test device is used to fix the battery pack to be tested, and the external processing device is connected to the battery pack to be tested through the battery thermal diffusion test device; the external power supply device is connected to the battery pack to be tested through the battery thermal diffusion test device.

[0046] One of the above technical solutions has the following advantages and beneficial effects:

[0047] The above-mentioned battery thermal diffusion test device includes a housing assembly, a detection assembly, and a fixing assembly. The housing assembly is provided with a receiving cavity for receiving the battery pack to be tested, and the battery pack to be tested includes a target battery cell and a plurality of adjacent battery cells; the detection assembly includes a first detection module and a plurality of second detection modules, and the first detection module is disposed on the target battery cell; each second detection module is correspondingly disposed on each adjacent battery cell; the fixing assembly is installed in the receiving cavity, and the fixing assembly is provided with a first fixing area and a second fixing area. The second fixing area surrounds the first fixing area. The first fixing area is used to fix the target battery cell, and the second fixing area is used to fix each adjacent battery cell, so as to perform a thermal diffusion test on the battery pack to be tested. In the present application, by installing the fixing assembly in the receiving cavity of the housing assembly, the fixing assembly can fix battery packs to be tested of different models. When the thermal diffusion test is started, the characteristic data of the target battery cell can be detected through the first detection module, and the characteristic data of the corresponding adjacent battery cell can be detected through the second detection module. Furthermore, according to the characteristic data of the target battery cell and the characteristic data of the adjacent battery cell, it can be determined whether the battery pack to be tested undergoes thermal diffusion; when the test is completed, the fixing assembly can be conveniently disassembled, and the battery pack to be tested can be quickly taken out, simplifying the disassembly and assembly process of the test sample, reducing the test cost, and the test device can be adapted to battery packs to be tested of different models and can be reused, improving the test versatility. Description of the Drawings

[0048] Figure 1 It is a first exploded structural schematic diagram of the battery thermal diffusion test device in the embodiment of the present application;

[0049] Figure 2 It is a first partial structural schematic diagram of the battery thermal diffusion test device in the embodiment of the present application;

[0050] Figure 3 It is a first sectional structural schematic diagram of the battery thermal diffusion test device in the embodiment of the present application;

[0051] Figure 4 It is an exploded structural schematic diagram of the fixing component in the embodiment of the present application;

[0052] Figure 5 It is a partial structural schematic diagram of the fixing component in the embodiment of the present application;

[0053] Figure 6 It is a first exploded structural schematic diagram of the housing component in the embodiment of the present application;

[0054] Figure 7 It is a partial exploded structural schematic diagram of the housing component in the embodiment of the present application;

[0055] Figure 8 It is a first structural schematic diagram of the box body main body in the embodiment of the present application;

[0056] Figure 9 It is a second structural schematic diagram of the box body main body in the embodiment of the present application;

[0057] Figure 10 It is a structural schematic diagram of the battery pack to be tested in the embodiment of the present application;

[0058] Figure 11 It is a first installation structural schematic diagram of the target battery cell in the embodiment of the present application;

[0059] Figure 12 It is a structural schematic diagram of the adjacent battery cell in the embodiment of the present application;

[0060] Figure 13 It is a second installation structural schematic diagram of the target battery cell in the embodiment of the present application;

[0061] Figure 14 It is a structural schematic diagram of the battery thermal diffusion test system in the embodiment of the present application.

[0062] Reference numerals:

[0063] 10. Battery thermal diffusion test device; 100. Housing assembly; 102. Accommodation cavity; 104. Box body main body; 1042. Second support plate; 1044. Third support plate; 1046. Pressure relief cavity; 106. Isolation sheet; 108. Second support column; 112. Pressure relief channel; 1122. Reinforcing rib; 1124. Gas through hole; 114. Pressure relief valve; 116. Detection through hole; 118. Air pressure sensor; 122. Third wire harness through hole; 124. Cover body; 2022. First voltage sensor; 2024. First temperature sensor; 2026. Heating sheet; 2028. Heat insulation sheet; 2042. Second voltage sensor; 2044. Second temperature sensor; 300. Fixing assembly; 302. First support plate; 3022. First main through groove; 3024. First secondary through groove; 304. First fixing plate; 3042. Second main through groove; 3044. Second secondary through groove; 3046. First wire harness through hole; 3048. First wire groove; 306. First fastener group; 308. Second fixing plate; 3082. Second wire harness through hole; 3084. Second wire groove; 3086. First support column; 410. Positive electrode connection assembly; 412. First conductive sliding rod; 414. First connection piece; 416. Second fastener; 418. First annular elastic piece; 420. Negative electrode connection assembly; 422. Second conductive sliding rod; 424. Second connection piece; 426. Third fastener; 428. Second annular elastic piece; 430. Insulating seat; 50. External processing device; 60. External power supply device; 70. Battery pack to be tested; 710. Target battery cell; 720. Adjacent battery cell. Detailed implementation manners

[0064] In order to enable those skilled in the art of the present technology to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0065] It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of this application here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0066] In addition, the term "plurality" shall mean two or more.

[0067] It should be noted that, without conflict, the embodiments and features in the embodiments of this application may be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0068] In one embodiment, as Figure 1 、 Figure 2 and Figure 10 shown, a battery thermal diffusion test device is provided, which includes a housing assembly, a detection assembly, and a fixing assembly 300. The housing assembly is provided with a receiving cavity 102 for receiving a battery pack 70 to be tested. The battery pack 70 to be tested includes a target battery cell 710 and a plurality of adjacent battery cells 720. The detection assembly includes a first detection module and a plurality of second detection modules. The first detection module is disposed on the target battery cell 710. Each second detection module is correspondingly disposed on each adjacent battery cell 720. The fixing assembly 300 is installed in the receiving cavity 102 and is provided with a first fixing area and a second fixing area. The second fixing area is disposed around the first fixing area. The first fixing area is used to fix the target battery cell 710, and the second fixing area is used to fix each adjacent battery cell 720.

[0069] Among them, the battery pack 70 to be tested may include at least 2 single battery cells, and each single battery cell can be divided into a target battery cell 710 and at least 1 adjacent battery cell 720. The single battery cell can be a cylindrical battery cell. For example, the single battery cell can be a cylindrical battery of model 4695. In another example, the single battery cell can also be a cylindrical battery of other models. For example, the single battery cell can be a cylindrical battery cell of different heights and different material systems in the 46XX series. Exemplarily, the battery pack 70 to be tested includes 1 target battery cell 710 and 6 adjacent battery cells 720. It should be noted that the target battery cell 710 and each adjacent battery cell 720 in the same battery pack 70 to be tested are good products produced in the same batch, the model of the target battery cell 710 is the same as that of each adjacent battery cell 720, and the consistency between the target battery cell 710 and each adjacent battery cell 720 is good (the relative range of capacity < 1%, and the relative range of ACR (alternating current internal resistance) value < 1%); each adjacent battery cell 720 is disposed around the target battery cell 710 so that each adjacent battery cell 720 is adjacent to the target battery cell 710 respectively.

[0070] The first detection module can be used to detect the temperature data, voltage data, etc. of the target battery cell 710; the second detection module can be used to detect the temperature data, voltage data, etc. of the corresponding target battery cell 710. The first detection module can be arranged on the side and / or top surface of the target battery cell 710, and the second detection module can be arranged on the side and / or top surface of the corresponding adjacent battery cell 720. It should be noted that the top surface of the target battery cell 710 is the electrode surface, and the top surface of the adjacent battery cell 720 is the electrode surface. The material of the housing assembly can be a metal material or a non-metal material with a certain strength. The housing assembly has a receiving cavity 102. When installing the battery pack 70 to be measured, open the housing assembly, install the fixing component 300 in the receiving cavity 102, and fix the battery pack 70 to be measured in the fixing component 300, and then close the housing assembly to realize the convenient installation and fixation of the battery pack 70 to be measured.

[0071] The fixing component 300 can be installed in the receiving cavity 102 of the housing assembly by means of screwing or the like. The fixing component 300 is provided with a fixing space, which can be divided into a first fixing area and a second fixing area. The first fixing area is used to fix the target battery cell 710, and the second fixing area is used to fix each adjacent battery cell 720. For example, the target battery cell 710 is arranged in the first fixing area, and the top and bottom of the target battery cell 710 are fixed through the first fixing area, so as to realize the fixation of the target battery cell 710; similarly, each adjacent battery cell 720 is arranged in the second fixing area, and the top and bottom of each adjacent battery cell 720 are fixed through the second fixing area, so as to realize the fixation of each adjacent battery cell 720. For example, by arranging the second fixing area to surround and be adjacent to the first fixing area, when the fixing component 300 is opened, the target battery cell 710 is arranged in the first fixing area, and each adjacent battery cell 720 is arranged in the second fixing area, and then the fixing component 300 is closed, so that each adjacent battery cell 720 can surround and be adjacent to the target battery cell 710.

[0072] Exemplarily, the process of the battery thermal diffusion test is as follows: Fix the battery pack 70 to be tested provided with a detection component in the fixing component 300, and then install the fixing component 300 in the accommodation cavity 102 of the housing component; Connect the external trigger device to the target battery cell 710, and trigger the thermal runaway of the target battery cell 710 through the external trigger device; Connect the external processing device 50 to the detection component, and obtain the characteristic data detected by the detection component through the external processing device 50 to complete the installation and connection of the battery pack 70 to be tested. The external processing device 50 obtains the pre-test characteristic information of the battery pack 70 to be tested; The external processing device 50 controls the external trigger device to trigger the thermal runaway of the target battery cell 710, and obtains the characteristic data of the target battery cell 710 detected by the first detection module. According to the pre-test characteristic information and the characteristic data of the target battery cell 710, it is judged whether the target battery cell 710 has a thermal runaway; After the thermal runaway of the target battery cell 710 occurs, the external processing device 50 obtains the characteristic data of each adjacent battery cell 720 detected by the second detection module; When the pre-test characteristic information and the characteristic data of any one of the adjacent battery cells 720 meet the first preset thermal runaway condition, it is determined that the battery pack 70 to be tested has a thermal diffusion, realizing the thermal diffusion test of the battery pack 70 to be tested. There is no need to use the entire battery panel as a test sample for testing. Only the target battery cell 710 and several adjacent battery cells 720 are used, and the pre-test characteristic information of the target battery cell 710 and several adjacent battery cells 720 is obtained. By obtaining the characteristic data of the target battery cell 710, it is judged whether the target battery cell has a thermal runaway; After the target battery cell 710 triggers a thermal runaway, the characteristic data of the adjacent battery cell 720 is obtained, and then according to the pre-test characteristic information and the characteristic data of the corresponding adjacent battery cell 720, it is judged whether the battery pack 70 to be tested has a thermal diffusion, improving the accuracy and reliability of the thermal diffusion test result, and reducing the high test cost and large test difficulty.

[0073] In the above embodiment, by installing the fixing component 300 in the accommodation cavity 102 of the housing component, the fixing component 300 can fix different models of battery packs 70 to be tested. When starting the thermal diffusion test, the characteristic data of the target battery cell 710 can be detected by the first detection module, and the characteristic data of the corresponding adjacent battery cell 720 can be detected by the second detection module. Then, according to the characteristic data of the target battery cell 710 and the adjacent battery cell 720, it is determined whether the battery pack 70 to be tested has a thermal diffusion; When the test is completed, the fixing component 300 can be conveniently disassembled, and then the battery pack 70 to be tested can be quickly taken out, simplifying the disassembly and assembly process of the test sample, reducing the test cost, and the test device can be adapted to different models of battery packs 70 to be tested and can be reused, improving the test versatility.

[0074] In one embodiment, such as Figure 3 and Figure 4As shown, the fixing component 300 includes a first support plate 302, a first fixing plate 304, and a first fastener group 306; the first support plate 302 is provided with a first main through groove 3022 and a plurality of first through grooves 3024, and each first through groove 3024 is arranged around the first main through groove 3022; the first main through groove 3022 is used for limiting the bottom of the target battery cell 710, and the first through grooves 3024 are used for limiting the bottoms of the corresponding adjacent battery cells 720; the first fixing plate 304 is provided with a second main through groove 3042 and a plurality of second through grooves 3044, and each second through groove 3044 is arranged around the second main through groove 3042; the second main through groove 3042 is used for limiting the top of the target battery cell 710, and the second through grooves 3044 are used for limiting the tops of the corresponding adjacent battery cells 720; the first fastener group 306 is detachably arranged between the first support plate 302 and the first fixing plate 304 to lock or loosen the target battery cell 710 and each adjacent battery cell 720.

[0075] Among them, the first support plate 302 is a support bottom plate, and the first support plate 302 is used to support and fix the battery pack 70 to be tested. The first support plate 302 can also be installed in the accommodation cavity 102 of the housing component by means of screwing or the like. The first main through groove 3022 is used to fix the bottom of the target battery cell 710, and the first through grooves 3024 are used to fix the bottoms of the corresponding adjacent battery cells 720. The first fixing plate 304 is arranged above the first support plate 302, and the first fixing plate 304 is used to fix the top of the battery pack 70 to be tested. The second main through groove 3042 is used to fix the top of the target battery cell 710, and the second through grooves 3044 are used to fix the tops of the corresponding adjacent battery cells 720. The first fastener group 306 can be composed of a plurality of bolts and a plurality of nuts. For example, the first support plate 302 is provided with a plurality of mounting holes, and the first fixing plate 304 is provided with a plurality of mounting holes. The first fastener group 306 passes through the corresponding mounting holes of the first support plate 302 and the corresponding mounting holes of the first fixing plate 304 to lock or loosen the first support plate 302 and the first fixing plate 304, thereby realizing locking or loosening of the target battery cell 710 and each adjacent battery cell 720, and improving the disassembly and assembly convenience of the battery pack 70 to be tested.

[0076] The first main through groove 3022 of the first support plate 302 is correspondingly arranged opposite to the second main through groove 3042 of the first fixing plate 304. The first secondary through groove 3024 of the first support plate 302 is correspondingly arranged opposite to the corresponding second secondary through groove 3044 of the first fixing plate 304. Based on the fact that each first secondary through groove 3024 is arranged around and adjacent to the first main through groove 3022, and each second secondary through groove 3044 is arranged around and adjacent to the second main through groove 3042. Furthermore, when the battery pack to be tested 70 is fixed to the fixing assembly 300, each adjacent battery cell 720 can surround and be adjacent to the target battery cell 710, realizing the installation positions of the corresponding single battery cells in the simulated battery pack box body.

[0077] It should be noted that by replacing the fixing assembly 300 with different sizes, it is possible to adapt to different models of the battery packs to be tested 70, improving the versatility of the battery thermal diffusion test.

[0078] In one embodiment, as Figure 4 shown, a first annular boss is arranged in the first main through groove 3022, and the first annular boss is used to abut against the bottom surface of the target battery cell 710. A second annular boss is arranged in the first secondary through groove 3024, and the second annular boss is used to abut against the bottom surface of the corresponding adjacent battery cell 720. A third annular boss is arranged in the second main through groove 3042, and the third annular boss is used to abut against the top surface of the target battery cell 710. A fourth annular boss is arranged in the second secondary through groove 3044, and the fourth annular boss is used to abut against the top surface of the corresponding adjacent battery cell 720.

[0079] Among them, the first annular boss and the first main through groove 3022 are of an integrally formed structure, the second annular boss and the first secondary through groove 3024 are of an integrally formed structure, the third annular boss and the second main through groove 3042 are of an integrally formed structure, and the fourth annular boss and the second secondary through groove 3044 are of an integrally formed structure.

[0080] For example, when the bottom of the target battery cell 710 is inserted into the first main through groove 3022, the first annular boss supports the bottom surface of the target battery cell 710. When the top of the target battery cell 710 is inserted into the second main through groove 3042, the third annular boss abuts against the top surface of the target battery cell 710. When the bottom of the adjacent battery cell 720 is inserted into the corresponding first secondary through groove 3024, the corresponding second annular boss supports the bottom surface of the corresponding target battery cell 710. When the top of the target battery cell 710 is inserted into the corresponding second secondary through groove 3044, the corresponding fourth annular boss abuts against the top surface of the corresponding adjacent battery cell 720, realizing the fixation of the target battery cell 710 and each adjacent battery cell 720.

[0081] In one embodiment, the first main through groove 3022 has opposite first and second ports. The size of the first port of the first main through groove 3022 is larger than that of the second port of the first main through groove 3022, and the size of the second port of the first main through groove 3022 is larger than the size of the explosion-proof valve of the target battery cell 710; the first secondary through groove 3024 has opposite first and second ports. The size of the first port of the first secondary through groove 3024 is larger than that of the second port of the first secondary through groove 3024, and the size of the second port of the first secondary through groove 3024 is larger than the size of the explosion-proof valve of the corresponding adjacent battery cell 720; the second main through groove 3042 has opposite first and second ports. The size of the first port of the second main through groove 3042 is larger than that of the second port of the second main through groove 3042, and the size of the second port of the second main through groove 3042 is smaller than the top surface size of the target battery cell 710; the second secondary through groove 3044 has opposite first and second ports. The size of the first port of the second secondary through groove 3044 is larger than that of the second port of the second secondary through groove 3044, and the size of the second port of the second secondary through groove 3044 is smaller than the top surface size of the corresponding adjacent battery cell 720.

[0082] The first port and the second port of the first main through groove 3022 are in communication. The first port and the second port of the first main through groove 3022 can be circular ports. The diameter of the first port of the first main through groove 3022 matches the diameter of the target battery cell 710. The diameter of the first port of the first main through groove 3022 is larger than the diameter of the second port of the first main through groove 3022. The size of the second port of the first main through groove 3022 is larger than the size of the explosion-proof valve of the target battery cell 710, so that the inside of the first main through groove 3022 is stepped. Thus, the bottom of the target battery cell 710 can be inserted from the first port of the first main through groove 3022 and abutted against the first annular boss, playing a supporting role for the bottom of the target battery cell 710, and at the same time ensuring that the valve can be opened normally when the target battery cell 710 undergoes thermal runaway. The first port and the second port of the first secondary through groove 3024 are in communication. The first port and the second port of the first secondary through groove 3024 can be circular ports. The diameter of the first port of the first secondary through groove 3024 matches the diameter of the adjacent battery cell 720. The diameter of the first port of the first secondary through groove 3024 is larger than the diameter of the second port of the first secondary through groove 3024. The size of the second port of the first secondary through groove 3024 is larger than the size of the explosion-proof valve of the adjacent battery cell 720, so that the inside of the first secondary through groove 3024 is stepped. Thus, the bottom of the adjacent battery cell 720 can be inserted from the first port of the corresponding first secondary through groove 3024 and abutted against the second annular boss, playing a supporting role for the bottom of the corresponding adjacent battery cell 720, and at the same time ensuring that the valve can be opened normally when the adjacent battery cell 720 undergoes thermal runaway.

[0083] The first port and the second port of the second main through groove 3042 are in communication. The first port and the second port of the second main through groove 3042 can be circular ports. The diameter of the first port of the second main through groove 3042 matches the diameter of the target battery core 710. The diameter of the first port of the second main through groove 3042 is greater than the diameter of the second port of the second main through groove 3042. The diameter of the second port of the second main through groove 3042 is smaller than the top surface diameter of the target battery core 710, such that the inside of the second main through groove 3042 is stepped. Thus, the top of the target battery core 710 can be inserted from the first port of the second main through groove 3042 and abutted against the third annular boss, which plays a role in fixing the top of the target battery core 710 and facilitates wiring of the electrode surface at the top of the target battery core 710. The first port and the second port of the second through groove 3044 are in communication. The first port and the second port of the second through groove 3044 can be circular ports. The diameter of the first port of the second through groove 3044 matches the diameter of the adjacent battery core 720. The diameter of the first port of the second through groove 3044 is greater than the diameter of the second port of the second through groove 3044. The diameter of the second port of the second through groove 3044 is smaller than the top surface diameter of the adjacent battery core 720, such that the inside of the second through groove 3044 is stepped. Thus, the top of the secondary battery core can be inserted from the first port of the second through groove 3044 and abutted against the fourth annular boss, which plays a role in fixing the top of the corresponding adjacent battery core 720 and facilitates wiring of the electrode surface at the top of the adjacent battery core 720.

[0084] In one embodiment, as Figure 4 shown, the first fixing plate 304 is provided with a plurality of first wire harness through holes 3046 and a plurality of first wire grooves 3048; each of the first wire harness through holes 3046 and each of the first wire grooves 3048 are arranged in one-to-one correspondence; the connection wire harness of the second detection module passes through the corresponding first wire harness through hole 3046 and is placed in the corresponding first wire groove 3048.

[0085] For example, the number of the first wire harness through holes 3046 is the same as the number of the second through grooves 3044, and the first wire harness through holes 3046 can be arranged close to the corresponding second through grooves 3044; the number of the first wire harness through holes 3046 is the same as the number of the first wire grooves 3048, and the first wire grooves 3048 are used to accommodate the connection wire harness of the second detection module of the corresponding adjacent battery core 720.

[0086] After the connection wire harness of the second detection module passes through the corresponding first wire harness through hole 3046, the connection wire harness of the second detection module is placed in the corresponding first wire groove 3048, realizing the accommodation of the connection wire harness of the corresponding second detection module, avoiding the cross and disorderly arrangement of the connection wire harnesses of multiple second detection modules, and facilitating the quick connection of the second detection module to the external processing device 50.

[0087] In one embodiment, as Figure 3 and Figure 4As shown, the fixing component 300 further includes a second fixing plate 308 and a plurality of first support columns 3086; the second fixing plate 308 is disposed on the first fixing plate 304, and the first support columns 3086 are spaced apart between the first fixing plate 304 and the second fixing plate 308; the first fastener group 306 detachably disposes the first support plate 302, the first fixing plate 304, and the second fixing plate 308; the second fixing plate 308 is provided with a second wire harness through hole 3082 and a second wire groove 3084; the connection wire harness of the first detection module passes through the second wire harness through hole 3082 and is placed in the second wire groove 3084.

[0088] Wherein, the second fixing plate 308 is disposed above the first fixing plate 304, and a plurality of first support columns 3086 are disposed between the second fixing plate 308 and the first fixing plate 304. The first support columns 3086 can be equally spaced, so that there is a certain gap between the first fixing plate 304 and the second fixing plate 308, facilitating the lead-out wiring of the connection wire harness on the first fixing plate 304.

[0089] The second fixing plate 308 is provided with a plurality of mounting holes. The mounting holes on the second fixing plate 308, the mounting holes on the first support plate 302, and the mounting holes on the first fixing plate 304 are arranged in one-to-one correspondence. The first fastener group 306 passes through the corresponding mounting holes of the first support plate 302, the corresponding mounting holes of the first fixing plate 304, and the corresponding mounting holes of the second fixing plate 308 to lock or loosen between the first support plate 302, the first fixing plate 304, and the second fixing plate 308, thereby realizing the locking or loosening of the target battery cell 710 and each adjacent battery cell 720, thus improving the disassembly and assembly convenience of the battery pack 70 to be measured.

[0090] For example, the second wire harness through hole 3082 can be disposed close to the second main through groove 3042; the second wire groove 3084 is used to accommodate the connection wire harness of the first detection module corresponding to the target battery cell 710. After the connection wire harness of the first detection module passes through the second wire harness through hole 3082, the connection wire harness of the first detection module is placed in the second wire groove 3084 to realize the storage of the connection wire harness of the first detection module, avoiding the crossing and disorder of the connection wire harness of the first detection module and the connection wire harness of the second detection module, and facilitating the quick connection of the first detection module to the external processing device 50.

[0091] In one embodiment, as Figure 5As shown, the fixing component 300 further includes a positive connection component 410 and a negative connection component 420; the second fixing plate 308 is provided with a first connection through hole and a second connection through hole, and the top surface of the target battery cell 710 has a positive electrode end and a negative electrode end; the positive connection component 410 is arranged on the second fixing plate 308, the first end of the positive connection component 410 passes through the first connection through hole and abuts against the positive electrode end of the target battery cell 710, and the second end of the positive connection component 410 is used for connecting an external power supply device 60; the negative connection component 420 is arranged on the second fixing plate 308, the first end of the negative connection component 420 passes through the second connection through hole and abuts against the negative electrode end of the target battery cell 710, and the second end of the negative connection component 420 is used for connecting an external power supply device 60.

[0092] Among them, the positive connection component 410 is used to connect the positive electrode end of the target battery cell 710 and the positive electrode of the external power supply device 60, and the negative connection component 420 is used to connect the negative electrode end of the target battery cell 710 and the negative electrode of the external power supply device 60. The first connection through hole is arranged corresponding to the positive electrode end of the target battery cell 710, and the second connection through hole is arranged corresponding to the negative electrode end of the target battery cell 710.

[0093] The positive connection component 410 is arranged on the second fixing plate 308. The first end of the positive connection component 410 passes through the first connection through hole and abuts against the positive electrode end of the target battery cell 710 to realize the electrical connection between the positive connection component 410 and the positive electrode end of the target battery cell 710. Further, when the external power supply device 60 is connected to the second end of the positive connection component 410, the electrical connection between the positive electrode of the external power supply device 60 and the positive electrode end of the target battery cell 710 is realized. The negative connection component 420 is arranged on the second fixing plate 308. The first end of the negative connection component 420 passes through the second connection through hole and abuts against the negative electrode end of the target battery cell 710 to realize the electrical connection between the negative connection component 420 and the negative electrode end of the target battery cell 710. Further, when the external power supply device 60 is connected to the second end of the negative connection component 420, the electrical connection between the negative electrode of the external power supply device 60 and the negative electrode end of the target battery cell 710 is realized.

[0094] In one embodiment, as Figure 5As shown, the second fixing plate 308 is provided with mounting holes for mounting the insulating seat 430. The insulating seat 430 is provided with a first connection through-hole and a second connection through-hole. The positive connection assembly 410 includes a first conductive slide bar 412, a first connection piece 414 and a second fastener 416. The first end of the first connection piece 414 is provided with a third connection through-hole, and the second end of the first connection piece 414 is provided with a fourth connection through-hole for connecting to an external power supply device 60. The first end of the first conductive slide bar 412 is provided with a first connection head and a first support seat, and the second end of the first conductive slide bar 412 is provided with a second connection head. The first end of the first conductive slide bar 412 passes through the first connection through-hole and the third connection through-hole and is locked to the first connection head by the second fastener 416, so that the first end of the first connection piece 414 is locked to the first support seat. The second connection head is used to abut against the positive electrode end of the target battery cell 710. The negative connection assembly 420 includes a second conductive slide bar 422, a second connection piece 424 and a third fastener 426. The first end of the second connection piece 424 is provided with a fifth connection through-hole, and the second end of the second connection piece 424 is provided with a sixth connection through-hole for connecting to an external power supply device 60. The first end of the second conductive slide bar 422 is provided with a third connection head and a second support seat, and the second end of the second conductive slide bar 422 is provided with a fourth connection head. The first end of the second conductive slide bar 422 passes through the second connection through-hole and the fifth connection through-hole and is locked to the third connection head by the third fastener 426, so that the first end of the second connection piece 424 is locked to the second support seat. The fourth connection head is used to abut against the negative electrode end of the target battery cell 710.

[0095] Among them, the insulating seat 430 can be, but is not limited to, a silicone insulating seat 430. The insulating seat 430 can be inserted into the corresponding mounting hole of the second fixing plate 308 by an interference fit method. The first connection through-hole and the second connection through-hole are spaced apart on the first insulating seat 430. The first conductive slide bar 412 has opposite first and second ends. The first connection head and the first support seat can be integrally formed at the first end of the first conductive slide bar 412. For example, the first connection head can be an external thread structure, and the second fastener 416 can be a nut, that is, the second fastener 416 can be cooperatively connected with the first connection head. The first support seat can be a raised part adjacent to the external thread structure. The second end of the first conductive slide bar 412 is provided with a second connection head, which can be a cylindrical head. It should be noted that the bottom surface of the second connection head is a metal surface. When the bottom surface of the second connection head abuts against the positive electrode surface of the target battery cell 710, an electrical connection between the first conductive slide bar 412 and the positive electrode of the target battery cell 710 is established.

[0096] The first connecting piece 414 is a conductive metal connecting piece. A third connecting through-hole is provided at the first end of the first connecting piece 414. The size of the third connecting through-hole is larger than the size of the first connecting head and smaller than the size of the first support seat. The size of the third connecting through-hole is smaller than that of the first connecting through-hole, and the size of the first connecting through-hole is larger than the size of the first support seat and smaller than the size of the first connecting head. A fourth connecting through-hole is provided at the second end of the first connecting piece 414. The fourth connecting through-hole is used to connect an external power supply device 60. For example, the fourth connecting through-hole is a circular through-hole, and the wire harness of the external power supply device 60 can be connected and fixed to the fourth connecting through-hole through corresponding bolts and nuts, thereby forming a conductive circuit. It should be noted that the external power supply device 60 can be a charge and discharge cabinet.

[0097] The assembly process of the positive electrode connection assembly 410 is as follows: The first end of the first conductive slide bar 412 is sequentially passed through the first connecting through-hole and the third connecting through-hole, so that the first end of the first connecting piece 414 abuts against the first support seat, and is locked to the first connecting head through the second fastener 416, thereby realizing the firm connection between the first end of the first connecting piece 414 and the first end of the first conductive slide bar 412; by applying pressure to the first conductive slide bar 412, the second connecting head abuts against the positive electrode end of the target battery cell 710, and the fourth connecting through-hole of the first connecting piece 414 is connected to the external power supply device 60, thereby connecting the conductive circuit between the external power supply device 60 and the positive electrode end of the target battery cell 710.

[0098] The second conductive slide bar 422 has opposite first and second ends. The third connecting head and the second support seat can be provided at the first end of the second conductive slide bar 422 by an integral molding method. For example, the third connecting head can be an external thread structure, and the third fastener 426 can be a nut, that is, the third fastener 426 can be cooperatively connected with the third connecting head; the second support seat can be a convex member adjacent to the external thread structure. A fourth connecting head is provided at the second end of the second conductive slide bar 422. The fourth connecting head can be a cylindrical head. It should be noted that the bottom surface of the fourth connecting head is a metal surface. When the bottom surface of the fourth connecting head abuts against the negative electrode surface of the target battery cell 710, an electrical connection between the second conductive slide bar 422 and the negative electrode of the target battery cell 710 is established.

[0099] The second connecting piece 424 is a conductive metal connecting piece. A fifth connecting through-hole is provided at the first end of the second connecting piece 424. The size of the fifth connecting through-hole is larger than the size of the third connecting head and smaller than the size of the second support base. The size of the fifth connecting through-hole is smaller than the size of the second connecting through-hole, and the size of the second connecting through-hole is larger than the size of the second support base and smaller than the size of the third connecting head. A sixth connecting through-hole is provided at the second end of the second connecting piece 424. The sixth connecting through-hole is used to connect an external power supply device 60. For example, the sixth connecting through-hole is a circular through-hole, and the wire harness of the external power supply device 60 can be connected and fixed to the sixth connecting through-hole through corresponding bolts and nuts, thereby forming a conductive loop. It should be noted that the external power supply device 60 can be a charge and discharge cabinet.

[0100] The assembly process of the negative electrode connection assembly 420 is as follows: The first end of the second conductive slide bar 422 is sequentially passed through the second connecting through-hole and the fifth connecting through-hole, so that the first end of the second connecting piece 424 abuts against the second support base, and is locked to the third connecting head through a fifth three-piece fastener, thereby realizing the fastening connection between the first end of the second connecting piece 424 and the first end of the second conductive slide bar 422; By applying pressure to the second conductive slide bar 422, the fourth connecting head is made to abut against the negative electrode end of the target battery cell 710, and the sixth connecting through-hole of the second connecting piece 424 is connected through the external power supply device 60, thereby connecting the conductive loop between the external power supply device 60 and the negative electrode end of the target battery cell 710, simplifying the connection structure for testing the battery pack 70 to be measured, and facilitating the disassembly and assembly of the battery pack 70 to be measured.

[0101] In one embodiment, as Figure 5 shown, the positive electrode connection assembly 410 is further provided with a first annular elastic member 418, and the rod body of the first conductive slide bar 412 is provided with a first insulating layer; The insulating seat 430 is used to move along the first conductive slide bar 412; The first annular elastic member 418 is sleeved on the rod body of the first conductive slide bar 412. The first end of the first annular elastic member 418 is used to abut against the second connecting head, and the second end of the first annular elastic member 418 is used to abut against the second fixing plate 308; The negative electrode connection assembly 420 is further provided with a second annular elastic member 428, and the rod body of the second conductive slide bar 422 is provided with a second insulating layer; The insulating seat 430 is further used to move along the second conductive slide bar 422; The second annular elastic member 428 is sleeved on the rod body of the second conductive slide bar 422. The first end of the second annular elastic member 428 is used to abut against the fourth connecting head, and the second end of the second annular elastic member 428 is used to abut against the second fixing plate 308.

[0102] Among them, the first annular elastic member 418 can be a spring, and the rod body of the first conductive slide bar 412 can be provided with an insulating outer shell by spraying, bonding or sleeving, etc., thereby forming a first insulating layer on the rod body of the first conductive slide bar 412.

[0103] The second annular elastic member 428 can be a spring. An insulating shell can be provided on the rod body of the second conductive sliding rod 422 by means such as spraying, bonding, or sleeving, so as to form a second insulating layer on the rod body of the second conductive sliding rod 422.

[0104] Based on the first conductive sliding rod 412 being inserted into the first connection through hole of the insulating seat 430, the first conductive sliding rod 412 can move in the corresponding sleeve of the insulating seat 430. By sleeving the first annular elastic member 418 on the first conductive sliding rod 412, and the first annular elastic member 418 being located between the second fixing plate 308 and the second connection head, then based on the elastic force of the first annular elastic member 418, the first end of the first annular elastic member 418 abuts against the second connection head, and the second end of the first annular elastic member 418 abuts against the second fixing plate 308, so that the second connection head of the first conductive sliding rod 412 abuts against the positive electrode end of the target battery cell 710, realizing the electrical connection between the first conductive sliding rod 412 and the positive electrode of the target battery cell 710.

[0105] Based on the second conductive sliding rod 422 being inserted into the second connection through hole of the insulating seat 430, the second conductive sliding rod 422 can move in the corresponding sleeve of the insulating seat 430. By sleeving the second annular elastic member 428 on the second conductive sliding rod 422, and the second annular elastic member 428 being located between the second fixing plate 308 and the fourth connection head, then based on the elastic force of the second annular elastic member 428, the first end of the second annular elastic member 428 abuts against the fourth connection head, and the second end of the second annular elastic member 428 abuts against the second fixing plate 308, so that the fourth connection head of the second conductive sliding rod 422 abuts against the negative electrode end of the target battery cell 710, realizing the electrical connection between the second conductive sliding rod 422 and the negative electrode of the target battery cell 710, facilitating the disassembly and assembly of the target battery cell 710, being able to adapt to the thermal diffusion test of the battery packs 70 to be measured with different heights, and improving the test versatility of the test device.

[0106] In one embodiment, as Figure 6 and Figure 7 shown, the housing assembly includes a box body main body 104 and a cover body 124; the cover body 124 and the box body main body 104 enclose to form an accommodation cavity 102; the box body main body 104 is provided with a second support plate 1042 and a third support plate 1044; the fixing assembly 300 is installed on the second support plate 1042, the second support plate 1042 and the third support plate 1044 are spaced apart, and the second support plate 1042, the third support plate 1044 and the side plates of the box body main body 104 enclose to form a pressure relief cavity 1046.

[0107] Among them, the cover body 124 can be connected to the box body main body 104 by means of screwing or the like. For example, a sealing strip is provided on the cover body 124, and mounting holes corresponding to bolts are respectively provided on the cover body 124, the sealing strip, and the box body main body 104. Furthermore, the cover body 124, the sealing strip, and the box body main body 104 are fixedly connected by matching bolts.

[0108] An accommodation cavity 102 is formed by enclosing between the second support plate 1042, the cover body 124, and the side of the box body main body 104. The second support plate 1042 is used to support and install the fixing assembly 300. For example, a boss is provided in the middle of the second support plate 1042, and a threaded hole is provided on the boss. Then, the first support plate 302 of the fixing assembly 300 and the second support plate 1042 can be connected and fixed by bolts. The second support plate 1042 and the box body main body 104 can be connected and fixed by bolts, and the third support plate 1044 and the box body main body 104 can be connected and fixed by corresponding bolts. There is a preset interval between the second support plate 1042 and the third support plate 1044. Furthermore, a pressure relief cavity 1046 is formed by enclosing between the second support plate 1042, the third support plate 1044, and the side plate of the box body main body 104.

[0109] In one embodiment, as Figure 7 shown, the second support plate 1042 is provided with pressure relief holes corresponding to the explosion-proof valves of the target battery cell 710 and the explosion-proof valves of each adjacent battery cell 720; a separator 106 is provided between the second support plate 1042 and the third support plate 1044, and the separator 106 is used to seal the pressure relief holes; the separator 106 is also used to conduct the pressure relief holes when the target battery cell 710 or an adjacent battery cell 720 undergoes thermal runaway.

[0110] For example, the pressure relief holes are provided in the boss of the second support plate 1042, that is, a hollow boss is formed on the second support plate 1042. The pressure relief holes can cover the explosion-proof valves of the target battery cell 710 and the explosion-proof valves of each adjacent battery cell 720. The separator 106 can be a mica sheet. The separator 106 is located between the second support plate 1042 and the third support plate 1044. The separator 106 can be covered and arranged on the pressure relief holes by means of pressing or bonding to seal the pressure relief holes. When the target battery cell 710 or an adjacent battery cell 720 undergoes thermal runaway, the explosion-proof valve of the target battery cell 710 or the explosion-proof valve of an adjacent battery cell 720 opens and ejects high-temperature and high-pressure gas. When the high-temperature and high-pressure gas breaks through the separator 106, the pressure relief holes are conducted, so that the high-temperature and high-pressure gas enters the pressure relief cavity 1046.

[0111] In one embodiment, as Figure 2 and Figure 3 shown, the box body main body 104 is further provided with a pressure relief channel 112 and a pressure relief valve 114; the pressure relief channel 112 communicates with the pressure relief cavity 1046, and the pressure relief valve 114 is used to communicate with the pressure relief channel 112.

[0112] Among them, the pressure relief passage 112 can be arranged on the side surface of the box body main body 104, and the pressure relief valve 114 can be arranged on one side surface of the box body main body 104. When the pressure relief valve 114 is turned on, the pressure relief valve 114 communicates with the pressure relief passage 112, and the pressure relief passage 112 communicates with the pressure relief cavity 1046.

[0113] For example, when the target battery cell 710 undergoes thermal runaway, the explosion-proof valve of the target battery cell 710 opens and ejects high-temperature and high-pressure gas. When the high-temperature and high-pressure gas breaks through the isolation sheet 106, the pressure relief hole is turned on, so that the high-temperature and high-pressure gas enters the pressure relief cavity 1046. The high-temperature and high-pressure gas in the pressure relief cavity 1046 enters the pressure relief passage 112 of the box body main body 104, and through the drainage of the pressure relief passage 112, finally the high-temperature and high-pressure gas reaches the pressure relief valve 114 arranged on the box body main body 104. When the internal air pressure of the box body main body 104 is higher than the opening pressure of the pressure relief valve 114, the pressure relief valve 114 is turned on, and then the high-temperature and high-pressure gas is discharged to avoid the explosion of the housing assembly.

[0114] In one embodiment, as Figure 3 shown, a plurality of reinforcing ribs 1122 are arranged in the pressure relief passage 112 to divide the pressure relief passage 112 into a plurality of pressure relief sub-passages; a plurality of gas through holes 1124 are arranged on the reinforcing ribs 1122 to communicate the pressure relief sub-passages.

[0115] Among them, by arranging a plurality of reinforcing ribs 1122 in the pressure relief passage 112, the side wall strength of the box body main body 104 can be enhanced. By arranging a plurality of gas through holes 1124 on the reinforcing ribs 1122 to communicate the pressure relief sub-passages, when the high-temperature and high-pressure gas enters the pressure relief cavity 1046, the high-temperature and high-pressure gas can enter each pressure relief sub-passage through each gas through hole 1124, and is drained and transmitted through each pressure relief sub-passage, so as to drain the high-temperature and high-pressure gas to the pressure relief valve 114 to trigger the pressure relief valve 114 to turn on and timely discharge the high-temperature and high-pressure gas.

[0116] In one embodiment, as Figure 3 and Figure 7 shown, a plurality of second support columns 108 are further arranged between the first support plate 302 and the second support plate 1042; the second support columns 108 are used to adjust the distance between the first support plate 302 and the second support plate 1042 to adjust the height of the pressure relief cavity 1046.

[0117] Among them, the second support columns 108 can be support columns with adjustable height, and the second support columns 108 can also be support columns with fixed height. Each second support column 108 can be arranged at equal intervals between the first support plate 302 and the second support plate 1042.

[0118] For example, by adjusting the height of each support column or placing second support columns 108 with different heights, the height of the pressure relief cavity 1046 can be adjusted.

[0119] In one embodiment, as Figure 8 and Figure 9 shown, the box body main body 104 is further provided with a detection through hole 116, and the detection through hole 116 is communicated with the pressure relief channel 112; a pressure sensor 118 is arranged on the detection through hole 116, and the pressure sensor 118 is used for connecting an external processing device 50.

[0120] For example, the pressure sensor 118 is provided with a pressure monitoring probe, and an installation hole is arranged near the detection through hole 116 of the box body main body 104. Furthermore, the pressure monitoring probe can be connected and fixed to the box body main body 104 through bolts, so as to monitor the air pressure in the pressure relief channel 112 of the box body main body 104. Based on the connection between the external processing device 50 and the pressure sensor 118, the external processing device 50 can obtain the air pressure data monitored by the pressure sensor 118, so as to judge whether the target battery cell 710 or the adjacent battery cell 720 has a thermal runaway.

[0121] In one embodiment, as Figure 8 and Figure 9 shown, the box body main body 104 is further provided with a third wire harness through hole 122; the connection wire harness of the first detection module and the connection wire harnesses of the second detection modules respectively pass through the third wire harness through hole 122 and are respectively connected to the external processing device 50.

[0122] Among them, the third wire harness through hole 122 is communicated with the outside, and the connection wire harness of the first detection module and the connection wire harnesses of the second detection modules respectively pass through the third wire harness through hole 122, so as to connect the corresponding connection wire harnesses to the external processing device 50 to realize convenient wiring.

[0123] In one example, a support member is further arranged on the side surface of the box body main body 104, and the support member is used to fix the box body main body 104 on the test platform to improve the safety of the test.

[0124] In one embodiment, as Figure 11 and Figure 12 shown, the first detection module includes a first voltage sensor 2022 and a plurality of first temperature sensors 2024; the second detection module includes a second voltage sensor 2042 and a plurality of second temperature sensors 2044; each first temperature sensor 2024 is arranged on the target battery cell 710, and the first voltage sensor 2022 is connected to the target battery cell 710; each second temperature sensor 2044 is arranged on the corresponding adjacent battery cell 720, and the second voltage sensor 2042 is connected to the adjacent battery cell 720.

[0125] Among them, the first voltage sensor 2022 is used to detect the voltage data of the target battery cell 710, and the first temperature data is used to detect the temperature data at the corresponding position of the target battery cell 710; the second voltage sensor 2042 is used to detect the voltage data of the adjacent battery cell 720, and the second temperature data is used to detect the temperature data at the corresponding position of the adjacent battery cell 720.

[0126] For example, one first temperature sensor 2024 is respectively arranged at the positive electrode surface and the side surface of the target battery cell 710 and is connected and fixed by a high-temperature tape. The probe of the first temperature sensor 2024 is wrapped with a high-temperature tape to achieve insulation; the electrode surface of the target battery cell 710 is connected to the first temperature sensor 2024. For example, one voltage monitoring wire is respectively arranged at the positive electrode surface and the negative electrode surface of the target battery cell 710 and is connected and fixed by welding. Similarly, one second temperature sensor 2044 is respectively arranged at the positive electrode surface and the side surface of the adjacent battery cell 720 and is connected and fixed by a high-temperature tape. The probe of the second temperature sensor 2044 is wrapped with a high-temperature tape to achieve insulation; the electrode surface of the adjacent battery cell 720 is connected to the second temperature sensor 2044. For example, one voltage monitoring wire is respectively arranged at the positive electrode surface and the negative electrode surface of the adjacent battery cell 720 and is connected and fixed by welding.

[0127] Exemplarily, when the triggering mode of thermal diffusion is overcharge triggering, the target battery cell 710 is connected to an external power supply device 60 (such as a charge and discharge cabinet). After the test is started, the external power supply device 60 is started, and the external power supply device 60 charges the target battery cell 710 with a constant current (such as the current selectable range is 1C to 5C). After the target battery cell 710 triggers thermal runaway, the external power supply device 60 is turned off, so that the target battery cell 710 stops charging, stands still and observes for 24 hours, and the test data is recorded throughout the process by the first temperature sensor 2024, the first voltage sensor 2022, the second temperature sensor 2044 and the second voltage sensor 2042.

[0128] In one embodiment, as Figure 13 shown, the first detection module further includes a heating sheet 2026 and a heat insulation sheet 2028; the heating sheet 2026 is arranged on the side surface of the target battery cell 710, and the heating sheet 2026 is used to connect to the external power supply device 60; the heat insulation sheet 2028 is arranged to cover the heating sheet 2026.

[0129] Among them, the heating sheet 2026 is an electric heating plate that generates heat on the plate surface after being energized without being charged and without open fire. Its shape is an arc-shaped sheet. The heating sheet 2026 is attached to the side surface of the target battery cell 710, connected and fixed by a high-temperature tape, and then covered with the heat insulation sheet 2028 (such as mica sticker) to ensure that the heat released by the heating sheet 2026 is mainly transferred to the target battery cell 710.

[0130] Exemplarily, when the triggering mode of thermal diffusion is heating trigger, a heating sheet 2026, a first temperature sensor 2024, and a first voltage sensor 2022 can be arranged for the target battery cell 710. Among them, the arrangement manners of the first temperature sensor 2024 and the first voltage sensor 2022 are as described in the overcharge trigger above and will not be elaborated here. The heating sheet 2026 is connected to an external power supply device 60 (such as a DC power supply) through a wire. After the test is started, the external power supply device 60 is started, and the heating power of the heating sheet 2026 is controlled to be kept constant (such as the power selection range is 100W - 300W) to heat the target battery cell 710. After the target battery cell 710 triggers thermal runaway, the external power supply device 60 is turned off, and the heating of the target battery cell 710 is stopped. Then, it is left to stand and observe for 24 hours, and the test data is recorded throughout the process, and thus the test data is obtained.

[0131] In one example, the thermal diffusion test process for the battery pack 70 to be tested is as follows: a detection component is set for the battery pack 70 to be tested, the battery pack 70 to be tested is fixed on the fixing component 300, and the fixing component 300 is installed in the accommodation cavity 102 of the housing component, and the detection component is connected through an external processing device 50. Based on a preset triggering condition (such as overcharge trigger or heating trigger), the target battery cell 710 is triggered to have thermal runaway. During the thermal runaway triggering process of the target battery cell 710, temperature detection and sample state detection are performed on the target battery cell 710, and thus the second test temperature and the second test post-sample state information of the target battery cell 710 are obtained. According to the second test temperature of the target battery cell 710, the rising rate of the second test temperature is obtained, and the rising rate of the second test temperature is compared with a second threshold (such as 1°C / s). When the rising rate of the second test temperature continuously exceeds the second threshold for a second preset time (such as more than 3s), the second test post-sample state information of the target battery cell 710 is compared with the second pre-test sample state information, and when the comparison result meets the second comparison condition, it is determined that the target battery cell 710 has thermal runaway, so as to accurately and reliably judge the thermal runaway of the target battery cell 710.

[0132] Further, after determining that the target battery cell 710 is thermally out of control, temperature detection and sample state detection are performed on each adjacent battery cell 720, and then the first test temperature and the first test post-sample state information of the corresponding adjacent battery cell 720 are obtained. According to the first test temperature of the adjacent battery cell 720, the rising rate of the first test temperature is obtained, and the rising rate of the first test temperature is compared with a first threshold value (such as 1 °C / s). When the rising rate of the first test temperature continuously exceeds the first threshold value for a first preset time (such as more than 3 s), the first test post-sample state information of the corresponding adjacent battery cell 720 is compared with the first test pre-sample state information, and when the comparison result satisfies the first comparison condition, it is determined that the corresponding adjacent battery cell 720 has a thermal runaway, and then it is determined that the battery pack 70 to be tested has a thermal diffusion, so as to accurately judge the thermal diffusion test result of the battery pack 70 to be tested and improve the reliability of the thermal diffusion test result.

[0133] In one embodiment, as Figure 14 shown, a battery thermal diffusion test system is further provided, including an external processing device 50, an external power supply device 60, and the battery thermal diffusion test device 10 according to any one of the above; the battery thermal diffusion test device 10 is used to fix the battery pack 70 to be tested, and the external processing device 50 is connected to the battery pack 70 to be tested through the battery thermal diffusion test device 10; the external power supply device 60 is connected to the battery pack 70 to be tested through the battery thermal diffusion test device 10.

[0134] Among them, the external power supply device 60 can be a charge and discharge cabinet, and the external power supply device 60 is used to supply power to the target battery cell 710 to trigger overcharging of the target battery cell 710. In another example, the external power supply device 60 is also used to supply power to the heating sheet 2026 provided on the target battery cell 710 to trigger heating of the target battery cell 710. For the specific descriptions of the external processing device 50 and the battery thermal diffusion test device 10, please refer to the descriptions of the above embodiments and will not be repeated here.

[0135] The battery thermal diffusion test device 10 includes a housing assembly, a fixing assembly 300, and a detection assembly. By arranging the detection assembly on the target battery cell 710 and each adjacent battery cell 720, fixing the target battery cell 710 and each adjacent battery cell 720 on the fixing assembly 300, and installing the fixing assembly 300 in the accommodation cavity 102 of the housing assembly. When starting the thermal diffusion test, the external power supply device 60 triggers thermal diffusion. The characteristic data of the target battery cell 710 is detected by the first detection module, and the characteristic data of the corresponding adjacent battery cell 720 is detected by the second detection module. Furthermore, the external processing device 50 determines whether thermal diffusion occurs in the battery pack 70 to be tested according to the obtained characteristic data of the target battery cell 710 and the adjacent battery cell 720. After the test is completed, the fixing assembly 300 can be conveniently disassembled, and then the battery pack 70 to be tested can be quickly taken out, simplifying the disassembly and assembly process of the test sample, reducing the test cost. The test device can be adapted to different models of battery packs 70 to be tested and can be reused, improving the test versatility of the battery thermal diffusion test system.

[0136] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0137] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A battery thermal diffusion test device, characterized in that, Comprising: A housing assembly, the housing assembly is provided with a receiving cavity for receiving a battery pack to be tested, and the battery pack to be tested includes a target battery cell and a plurality of adjacent battery cells; A detection assembly, the detection assembly includes a first detection module and a plurality of second detection modules, the first detection module is arranged on the target battery cell; each of the second detection modules is arranged on each of the adjacent battery cells in a one-to-one correspondence; A fixing assembly, the fixing assembly is installed in the receiving cavity, the fixing assembly is provided with a first fixing area and a second fixing area, the second fixing area is arranged around the first fixing area, the first fixing area is used for fixing the target battery cell, and the second fixing area is used for fixing each of the adjacent battery cells.

2. The battery thermal diffusion test device according to claim 1, wherein The fixing assembly includes a first support plate, a first fixing plate and a first fastener group; The first support plate is provided with a first main through groove and a plurality of first secondary through grooves, and each of the first secondary through grooves is arranged around the first main through groove; the first main through groove is used for limiting the bottom of the target battery cell, and the first secondary through groove is used for limiting the bottom of the corresponding adjacent battery cell; The first fixing plate is provided with a second main through groove and a plurality of second secondary through grooves, and each of the second secondary through grooves is arranged around the second main through groove; the second main through groove is used for limiting the top of the target battery cell, and the second secondary through groove is used for limiting the top of the corresponding adjacent battery cell; The first fastener group is detachably arranged between the first support plate and the first fixing plate to lock or loosen the target battery cell and each of the adjacent battery cells.

3. The battery thermal diffusion test device according to claim 2, characterized in that, A first annular boss is arranged in the first main through groove for abutting against the bottom surface of the target battery cell, and a second annular boss is arranged in the first secondary through groove for abutting against the bottom surface of the corresponding adjacent battery cell; A third annular boss is arranged in the second main through groove for abutting against the top surface of the target battery cell, and a fourth annular boss is arranged in the second secondary through groove for abutting against the top surface of the corresponding adjacent battery cell.

4. The battery thermal diffusion test device according to claim 3, wherein, The first main through groove has opposite first and second ports, the size of the first port of the first main through groove is greater than the size of the second port of the first main through groove, and the size of the second port of the first main through groove is greater than the size of the explosion-proof valve of the target battery cell; the first secondary through groove has opposite first and second ports, the size of the first port of the first secondary through groove is greater than the size of the second port of the first secondary through groove, and the size of the second port of the first secondary through groove is greater than the size of the explosion-proof valve of the corresponding adjacent battery cell; The second main through groove has opposite first and second ports, the size of the first port of the second main through groove is greater than the size of the second port of the second main through groove, and the size of the second port of the second main through groove is smaller than the top surface size of the target battery cell; the second secondary through groove has opposite first and second ports, the size of the first port of the second secondary through groove is greater than the size of the second port of the second secondary through groove, and the size of the second port of the second secondary through groove is smaller than the top surface size of the corresponding adjacent battery cell.

5. The battery thermal diffusion test device according to claim 2, wherein The first fixing plate is provided with a plurality of first wire harness through holes and a plurality of first wire grooves; each of the first wire harness through holes corresponds to one of the first wire grooves; The connecting wire harness of the second detection module passes through the corresponding first wire harness through hole and is placed in the corresponding first wire groove.

6. The battery thermal diffusion test device according to claim 2, wherein, The fixing component further includes a second fixing plate and a plurality of first support columns; the second fixing plate is arranged on the first fixing plate, and the first support columns are arranged at intervals between the first fixing plate and the second fixing plate; the first fastener group is detachably arranged on the first support plate, the first fixing plate and the second fixing plate; The second fixing plate is provided with a second wire harness through hole and a second wire groove; the connecting wire harness of the first detection module passes through the second wire harness through hole and is placed in the second wire groove.

7. The battery thermal diffusion test device according to claim 6, wherein, The fixing component further includes a positive connection component and a negative connection component; the second fixing plate is provided with a first connection through hole and a second connection through hole, and the top surface of the target battery cell has a positive electrode end and a negative electrode end; The positive connection component is arranged on the second fixing plate, the first end of the positive connection component passes through the first connection through hole and abuts against the positive electrode end of the target battery cell, and the second end of the positive connection component is used for connecting an external power supply device; the negative connection component is arranged on the second fixing plate, the first end of the negative connection component passes through the second connection through hole and abuts against the negative electrode end of the target battery cell, and the second end of the negative connection component is used for connecting the external power supply device.

8. The battery thermal diffusion test device according to claim 7, wherein The second fixing plate is provided with a mounting hole, and the mounting hole is used for arranging an insulating seat, and the insulating seat is provided with the first connection through hole and the second connection through hole; The positive connection component includes a first conductive sliding rod, a first connection piece and a second fastener; a third connection through hole is arranged at the first end of the first connection piece, a fourth connection through hole is arranged at the second end of the first connection piece, and the fourth connection through hole is used for connecting the external power supply device; a first connection head and a first support seat are arranged at the first end of the first conductive sliding rod, and a second connection head is arranged at the second end of the first conductive sliding rod; the first end of the first conductive sliding rod passes through the first connection through hole and the third connection through hole, and is locked to the first connection head through the second fastener, so that the first end of the first connection piece is locked to the first support seat; the second connection head is used for abutting against the positive electrode end of the target battery cell; The negative electrode connection assembly includes a second conductive slide bar, a second connection piece, and a third fastener; a fifth connection through-hole is provided at the first end of the second connection piece, and a sixth connection through-hole is provided at the second end of the second connection piece. The sixth connection through-hole is used to connect the external power supply device; a third connection head and a second support seat are provided at the first end of the second conductive slide bar, and a fourth connection head is provided at the second end of the second conductive slide bar. The first end of the second conductive slide bar passes through the second connection through-hole and the fifth connection through-hole and is locked to the third connection head by the third fastener, so that the first end of the second connection piece is locked to the second support seat; the fourth connection head is used to abut against the negative electrode end of the target battery cell.

9. The battery thermal diffusion test device according to claim 8, wherein, The positive electrode connection assembly is further provided with a first annular elastic member, and a first insulating layer is provided on the rod body of the first conductive slide bar; the insulating seat is used to move along the first conductive slide bar; the first annular elastic member is sleeved on the rod body of the first conductive slide bar, the first end of the first annular elastic member is used to abut against the second connection head, and the second end of the first annular elastic member is used to abut against the second fixing plate. The negative electrode connection assembly is further provided with a second annular elastic member, and a second insulating layer is provided on the rod body of the second conductive slide bar; the insulating seat is also used to move along the second conductive slide bar; the second annular elastic member is sleeved on the rod body of the second conductive slide bar, the first end of the second annular elastic member is used to abut against the fourth connection head, and the second end of the second annular elastic member is used to abut against the second fixing plate.

10. The battery thermal diffusion test device according to claim 1, characterized in that, The housing assembly includes a box body main body and a cover body; the cover body and the box body main body enclose to form the accommodation cavity. The box body main body is provided with a second support plate and a third support plate; the fixing assembly is installed on the second support plate, and the second support plate and the third support plate are spaced apart. The second support plate, the third support plate, and the side plate of the box body main body enclose to form a pressure relief cavity.

11. The battery thermal diffusion test device according to claim 10, wherein The second support plate is provided with a pressure relief hole, and the pressure relief hole corresponds to the explosion-proof valve of the target battery cell and the explosion-proof valves of each adjacent battery cell. An isolation sheet is arranged between the second support plate and the third support plate, and the isolation sheet is used to seal the pressure relief hole; the isolation sheet is also used to conduct the pressure relief hole when the target battery cell or the adjacent battery cell has a thermal runaway.

12. The battery thermal diffusion test device according to claim 11, characterized in that, A plurality of second support columns are further arranged between the first support plate and the second support plate. The second support column is used to adjust the distance between the first support plate and the second support plate to adjust the height of the pressure relief cavity.

13. The battery thermal diffusion test device according to claim 10, wherein, The box body main body is further provided with a pressure relief channel and a pressure relief valve; the pressure relief channel communicates with the pressure relief cavity, and the pressure relief valve is used to communicate with the pressure relief channel.

14. The battery thermal diffusion test device according to claim 13, wherein A plurality of reinforcing ribs are arranged in the pressure relief channel to divide the pressure relief channel into a plurality of pressure relief sub-channels. The reinforcing rib is provided with a plurality of gas through-holes to communicate each pressure relief sub-channel.

15. The battery thermal diffusion test device according to claim 13, wherein, The box body main body is further provided with a detection through hole, and the detection through hole is communicated with the pressure relief channel; a pressure sensor is arranged on the detection through hole, and the pressure sensor is used for connecting an external processing device.

16. The battery thermal diffusion test device according to claim 10, characterized in that, The box body main body is further provided with a third wire harness through hole; The connection wire harness of the first detection module and the connection wire harnesses of the second detection modules respectively pass through the third wire harness through hole and are respectively connected to an external processing device.

17. The battery thermal diffusion test device according to any one of claims 1 to 16, characterized in that, The first detection module includes a first voltage sensor and a plurality of first temperature sensors; the second detection module includes a second voltage sensor and a plurality of second temperature sensors; Each of the first temperature sensors is arranged on the target battery cell, and the first voltage sensor is connected to the target battery cell; each of the second temperature sensors is arranged on the corresponding adjacent battery cell, and the second voltage sensor is connected to the adjacent battery cell.

18. The battery thermal diffusion test device according to claim 17, wherein, The first detection module further includes a heating sheet and a heat insulation sheet; The heating sheet is arranged on the side surface of the target battery cell, and the heating sheet is used for connecting an external power supply device; the heat insulation sheet is arranged to cover the heating sheet.

19. A battery thermal diffusion test system, characterized in that, Including an external processing device, an external power supply device and the battery thermal diffusion test device according to any one of claims 1 to 18; The battery thermal diffusion test device is used for fixing a battery pack to be tested, and the external processing device is connected to the battery pack to be tested through the battery thermal diffusion test device; the external power supply device is connected to the battery pack to be tested through the battery thermal diffusion test device.

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