A battery cell thermal stability testing device

Abstract

This utility model relates to the technical field of batteries and discloses a battery cell thermal stability testing device, including a base plate and at least two support frames. Each support frame includes a first connecting rod, a second connecting rod, a pressure plate, and a bearing bracket. The pressure plate has multiple first through holes, and the bearing bracket has multiple second through holes corresponding to the positions of the first through holes. The multiple first and second through holes are spaced apart. The two ends of the first connecting rod are detachably connected to the first and second through holes, respectively. The two ends of the second connecting rod are detachably connected to another first and second through hole, respectively. A battery cell insertion port is formed between the first and second connecting rods. The base plate has a sliding groove, and each bearing bracket is slidably connected to the sliding groove at intervals. The positions of the battery cell insertion ports on adjacent support frames are the same, and a first spray nozzle is formed between adjacent support frames. This utility model's battery cell thermal stability testing device simplifies the operation process, improves fixing reliability, and reduces testing safety hazards.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a battery cell thermal stability testing device. Background Technology

[0002] In the thermal stability testing of power batteries, test samples are generally characterized by limited batch numbers and large dispersion of specifications. Current testing methods use steel strapping or fiber tape to directly fix the cells, which is cumbersome, difficult to achieve reliable fixation, and prone to sample displacement or poor contact during testing. Furthermore, it poses safety hazards; metal strapping may cause internal short circuits, and the tape may lose its fixing effect after high-temperature carbonization, both of which could lead to uncontrolled cell runaway and thermal propagation accidents during testing. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. It provides a battery cell thermal stability testing device that simplifies the operation process, improves fixation reliability, and reduces testing safety hazards.

[0004] To achieve the above objectives, this utility model provides a battery cell thermal stability testing device. The battery cell thermal stability testing device has a first direction, a second direction, and a third direction that intersect each other, including a base plate and at least two support frames. Each support frame includes a first connecting rod, a second connecting rod, a pressure plate, and a bearing bracket. The pressure plate has multiple first through holes, and the bearing bracket has multiple second through holes corresponding to the positions of the first through holes. The multiple first through holes and second through holes are respectively spaced apart along the first direction. The two ends of the first connecting rod are detachably connected to the first through hole and the second through hole corresponding to the position, respectively. The two ends of the second connecting rod are detachably connected to the first through hole and the second through hole corresponding to another position, respectively. A battery cell insertion port is formed between the first connecting rod and the second connecting rod.

[0005] The base plate is provided with a sliding groove extending along the second direction, and each of the bearing brackets is slidably connected to the sliding groove at intervals along the second direction. The cell insertion ports of adjacent support frames are in the same position in the first direction, and a first injection port is formed between adjacent support frames.

[0006] As a preferred embodiment, two adjacent support frames are configured as a first support frame and a second support frame. The pressure plate of the first support frame forms a first pressure surface between the first connecting rod and the second connecting rod, and the bearing bracket of the first support frame forms a first bearing surface between the first connecting rod and the second connecting rod. The pressure plate of the second support frame forms a second pressure surface between the first connecting rod and the second connecting rod, and the bearing bracket of the second support frame forms a second bearing surface between the first connecting rod and the second connecting rod. The first pressure surface, the first bearing surface, the second pressure surface, and the second bearing surface are respectively used to press and adhere to the test cell.

[0007] As a preferred embodiment, the base plate is provided with a second injection port, which is correspondingly arranged with the first injection port in the third direction, and the second injection port and the first injection port are connected to form an injection channel.

[0008] As a preferred embodiment, the base plate includes a plate body and a slide rail, the second injection port is opened in the plate body, the slide rail is connected to the plate body on one side of the second injection port, and the slide groove is opened in the slide rail.

[0009] As a preferred embodiment, the support bracket includes a support plate and a bracket. The support plate extends along the first direction, and the second through hole is formed in the support plate. The bracket is located between the support plate and the base plate. One end of the bracket is connected to the support plate, and the other end is slidably connected to the groove.

[0010] As a preferred embodiment, the support bracket further includes a slider, which is connected to the end of the bracket facing the base plate and is slidably connected to the groove.

[0011] As a preferred embodiment, the slide is a T-shaped slide and the slider is a T-shaped slider.

[0012] As a preferred embodiment, the first connecting rod includes a connecting rod body and a connecting member. One end of the connecting rod body is threadedly connected to the bearing bracket through the second through hole, and the other end passes through the first through hole and is threadedly connected to the connecting member. The second connecting rod has the same structure as the first connecting rod.

[0013] As a preferred embodiment, the connecting rod is a lead screw, and the connecting component is a nut.

[0014] As a preferred embodiment, the projection of the support frame onto the base plate along the third direction is located within the base plate.

[0015] Compared with existing technologies, the battery cell thermal stability testing device of this utility model has the following advantages: The test battery cell is placed in the battery cell insertion port, and the pressure plate presses the test battery cell firmly, preventing movement during testing and ensuring the stability and safety of the test. The test battery cell is located between the first connecting rod and the second connecting rod, and does not contact the first and second connecting rods during testing to avoid interference with the expansion of the test battery cell and improve the accuracy of the test results. The two ends of the second connecting rod pass through corresponding first and second through holes at other locations and are detachably connected to the pressure plate and the support bracket. This allows adjustment of the dimensions of the pressure plate and the support bracket in the height direction to accommodate tests of battery cells with different dimensions in the third direction, improving test versatility. Furthermore, since multiple first and second through holes are spaced apart along the first direction, the distance between the first and second connecting rods in the same support frame can be adjusted to accommodate tests of battery cells with different dimensions in the first direction. Each support bracket is connected to the slide groove at intervals. The test cells are inserted through multiple cell insertion ports. Multiple support brackets support and clamp the test cells, improving their stability and reliability, and further enhancing test safety. Simultaneously, adjacent support brackets can slide along the slide groove to adjust the distance between them in the second direction, thus accommodating the testing of cells of different sizes in the second direction, demonstrating strong adaptability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the component disassembly structure of an embodiment of this utility model.

[0018] Figure 3 This is a top view of an embodiment of the present utility model.

[0019] Figure 4 This is a front view of an embodiment of the present utility model.

[0020] Figure 5 This is a side view of an embodiment of the present utility model.

[0021] In the picture:

[0022] X, first direction; Y, second direction; Z, third direction;

[0023] 1. Base plate; 11. Spray channel; 111. Second spray nozzle; 12. Plate body; 13. Slide rail; 131. Slide groove;

[0024] 2. Support frame; 21. First injection port; 22. First connecting rod; 221. Connecting rod body; 222. Connector; 223. Battery cell insertion port; 23. Pressure plate; 231. First through hole; 24. Bearing bracket; 241. Bearing plate; 2411. Second through hole; 242. Bracket; 243. Slider; 25. First support frame; 251. First pressing surface; 252. First bearing surface; 26. Second support frame; 261. Second pressing surface; 262. Second bearing surface; 27. Second connecting rod;

[0025] 3. Test the battery cell; 31. Pressure relief port. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0031] like Figures 1 to 5 As shown in the preferred embodiment of this utility model, a battery cell thermal stability testing device has a first direction X, a second direction Y, and a third direction Z that intersect each other. It includes a base plate 1 and at least two support frames 2. The support frame 2 includes a first connecting rod 22, a second connecting rod 27, a pressure plate 23, and a bearing bracket 24. The pressure plate 23 is provided with a plurality of first through holes 231. The bearing bracket 24 is provided with a plurality of second through holes 2411 corresponding to the positions of the first through holes 231. The plurality of first through holes 231 and second through holes 2411 are respectively arranged at intervals along the first direction X. The two ends of the first connecting rod 22 are detachably connected to the first through holes 231 and second through holes 2411 corresponding to the positions. The two ends of the second connecting rod 27 are detachably connected to the first through holes 231 and second through holes 2411 corresponding to the other positions. A battery cell insertion port 223 is formed between the first connecting rod 22 and the second connecting rod 27.

[0032] The base plate 1 is provided with a slide groove 131 extending along the second direction Y. Each support bracket 24 is slidably connected to the slide groove 131 at intervals along the second direction Y. The battery cell insertion port 223 of adjacent support brackets 2 are in the same position in the first direction X. A first injection port 21 is formed between adjacent support brackets 2.

[0033] This utility model discloses a battery cell thermal stability testing device, comprising a base plate 1 and at least two support frames 2. Each support frame 2 includes a first connecting rod 22, a second connecting rod 27, a pressure plate 23, and a bearing bracket 24. The lower end of the bearing bracket 24 is connected to the base plate 1, and the bearing bracket 24 is used to support and bear the test battery cell 3. The pressure plate 23 is located above the bearing bracket 24 and is connected to the bearing bracket 24 via the first connecting rod 22 and the second connecting rod 27, forming a battery cell insertion port 223 between the first connecting rod 22 and the second connecting rod 27. The test battery cell 3 is placed in the battery cell insertion port 223, and the pressure plate 23 presses the test battery cell 3 firmly, preventing movement of the test battery cell 3 during testing and ensuring the stability and safety of the test. The test battery cell 3 is located between the first connecting rod 22 and the second connecting rod 27, and the test battery cell 3 does not contact the first connecting rod 22 and the second connecting rod 27 during testing to avoid interference with the expansion of the test battery cell 3 during testing and improve the accuracy of the test results. The two ends of the first connecting rod 22 pass through the corresponding first through hole 231 and second through hole 2411, respectively, and are detachably connected to the pressure plate 23 and the support bracket 24. The two ends of the second connecting rod 27 pass through the corresponding first through hole 231 and second through hole 2411 at another location, and are also detachably connected to the pressure plate 23 and the support bracket 24. This allows for adjustment of the dimensions of the pressure plate 23 and the support bracket 24 in the height direction, accommodating testing of battery cells with different dimensions in the third direction (Z), thus improving testing versatility. Furthermore, since multiple first through holes 231 and second through holes 2411 are spaced apart along the first direction (X), the distance between the first connecting rod 22 and the second connecting rod 27 in the same support frame 2 can be adjusted to accommodate testing of battery cells with different dimensions in the first direction (X). The base plate 1 is provided with a groove 131 extending along the second direction Y. Each support bracket 24 is connected to the groove 131 at intervals. The test cells 3 are respectively inserted through multiple cell insertion ports 223. Multiple support brackets 2 support and clamp the test cells 3, improving the stability and reliability of the cells and further enhancing the safety of the test. At the same time, adjacent support brackets 2 can slide along the groove 131 to adjust the distance between them in the second direction Y, thus meeting the testing requirements of cells of different sizes in the second direction Y, with strong adaptability.

[0034] As one embodiment, such as Figures 1 to 5 As shown, both the base plate 1 and the support frame 2 are made of 45# steel, which is resistant to high temperatures and can be reused, reducing testing costs.

[0035] Furthermore, such as Figure 4As shown, two adjacent support frames 2 are configured as a first support frame 25 and a second support frame 26. The pressure plate 23 of the first support frame 25 forms a first pressure surface 251 between the first connecting rod 22 and the second connecting rod 27. The bearing bracket 24 of the first support frame 25 forms a first bearing surface 252 between the first connecting rod 22 and the second connecting rod 27. The pressure plate 23 of the second support frame 26 forms a second pressure surface 261 between the first connecting rod 22 and the second connecting rod 27. The bearing bracket 24 of the second support frame 26 forms a second bearing surface 262 between the first connecting rod 22 and the second connecting rod 27. The first pressure surface 251, the first bearing surface 252, the second pressure surface 261, and the second bearing surface 262 are used to press and adhere to the test cell 3. The extension directions of the first connecting rod 22 and the second connecting rod 27 are the same as the spray direction of the test cell 3. The pressure plate 23 and the support bracket 24 are connected by the first connecting rod 22 and the second connecting rod 27, so that the first pressure surface 251, the first support surface 252, the second pressure surface 261 and the second support surface 262 press the test cell 3 respectively. When the cell is tested, the first pressure surface 251, the first support surface 252, the second pressure surface 261 and the second support surface 262 are in contact with the two end faces of the test cell 3 in the third direction Z, so as to ensure that the test cell 3 maintains a vertical test state and ensures the stability of the test process. The pressure relief port 31 of the test cell 3 faces the side of the base plate 1. When the thermal stability test is performed, the ejected material of the test cell 3 is ejected through the first spray port 21 to ensure the smooth progress of the thermal stability test.

[0036] Furthermore, such as Figure 1 and Figure 4 As shown, the base plate 1 has a second spray port 111, which is positioned corresponding to the first spray port 21 in the third direction Z. The second spray port 111 and the first spray port 21 are connected to form a spray channel 11. By providing the second spray port 111 on the base plate 1, and positioning the second spray port 111 and the first spray port 21 corresponding to each other in the third direction Z, and connecting to form the spray channel 11, the sprayed material from the test cell 3 during the test process can continue to be sprayed through the second spray port 111 after passing through the first spray port 21. This extends the sprayable space of the material and prevents it from being sprayed onto the base plate 1 and splashing back onto the test cell 3 and the test device, thus avoiding damage to the test cell 3 and the test device and affecting the test results. At the same time, a collection box is placed below the second spray port 111 to facilitate the collection of the sprayed material and prevent the high-temperature sprayed material from splashing around, thereby improving test safety.

[0037] As one embodiment, the base plate 1 has a through hole, which can be one or more. By opening the through hole, the overall weight of the base plate 1 is reduced, making it easier to transport.

[0038] Furthermore, such as Figures 1 to 5 As shown, the base plate 1 includes a plate body 12 and a slide rail 13. A second injection port 111 is formed on the plate body 12, and the slide rail 13 is connected to the plate body 12 on one side of the second injection port 111. A groove 131 is formed on the slide rail 13. The base plate 1 is designed in a split configuration, which facilitates the machining of the second injection port 111 and the groove 131 on the plate body 12 and reduces the machining difficulty.

[0039] As one embodiment, the slide rail 13 extends along the second direction Y. Both the plate 12 and the slide rail 13 are provided with threaded holes, and bolts are passed through the threaded holes respectively to realize the connection between the plate 12 and the slide rail 13. The assembly is simple, improves the assembly efficiency and reduces the assembly difficulty.

[0040] Furthermore, such as Figure 2 and Figure 5 As shown, the support bracket 24 includes a support plate 241 and a bracket 242. The support plate 241 extends along the first direction X, and a second through hole 2411 is formed in the support plate 241. The bracket 242 is located between the support plate 241 and the base plate 1. One end of the bracket 242 is connected to the support plate 241, and the other end is slidably connected to the slide groove 131. The support plate 241 is used to support the test cell 3. Both ends of the bracket 242 are connected to the slide groove 131 of the support plate 241 and the base plate 1, respectively. The bracket 242 is located between the support plate 241 and the base plate 1, supporting the support plate 241 and maintaining a certain distance between the support plate 241 and the base plate 1, providing a certain spray space for the test cell 3, and ensuring the smooth progress of the thermal stability test.

[0041] Furthermore, such as Figure 2 and Figure 5 As shown, the support bracket 24 also includes a slider 243, which is connected to the end of the bracket 242 facing the base plate 1. The slider 243 is slidably connected to the groove 131. The groove 131 is a through groove, and the slider 243 is pushed into the groove 131 from the end of the groove. The assembly operation is simple, requiring no complex alignment or auxiliary tools, simplifying the assembly process and improving assembly efficiency. During maintenance, only the slider 243 needs to be pulled out along the axial direction of the groove 131, without disassembling the entire structure, reducing downtime and labor costs. At the same time, by sliding the slider 243 in the groove 131, the distance between adjacent support brackets 2 can be adjusted to meet the fixing requirements of test cells 3 of different sizes.

[0042] Furthermore, such as Figure 2 and Figure 5As shown, the slide 131 is a T-shaped slide 131, and the slider 243 is a T-shaped slider 243. The flange structure of the T-shaped slide 131 cooperates with the groove of the slider 243 to form a lateral mechanical limit, effectively preventing the slider 243 from accidentally dislodging under vibration, impact, or lateral load, thus improving test safety. The symmetrical design of the T-section enhances torsional stiffness, reduces tilting or jamming of the slider 243 due to off-center loading during movement, improves sliding smoothness, and enhances the user experience.

[0043] Furthermore, such as Figure 1 , Figure 2 , Figure 4 as well as Figure 5 As shown, the first connecting rod 22 includes a connecting rod body 221 and a connector 222. One end of the connecting rod body 221 is threaded to the support bracket 24 through the second through hole 2411, and the other end passes through the first through hole 231 and is threaded to the connector 222. The second connecting rod 27 has the same structure as the first connecting rod 22. One end of the connecting rod body 221 is threaded to the support bracket 24 through the second through hole 2411. The connection between the connecting rod body 221 and the support bracket 24 is detachable, so that the connecting rod body 221 can be connected to different second through holes 2411 according to the size of the test cell 3, while simultaneously fixing the position of the connecting rod body 221. The other end of the connecting rod 221 passes through the first through hole 231 of the pressure plate 23 and is connected to the connector 222. The connector 222 is rotated and tightened, and then the pressure plate 23 presses the test cell 3. The operation is simple. The connection position of the connector 222 on the connecting rod 221 can be adjusted by rotating the connector 222 to meet the pressing requirements of test cells 3 of different sizes in the third direction Z, thereby improving the adaptability of the test device.

[0044] Furthermore, such as Figure 1 , Figure 2 , Figure 4 as well as Figure 5 As shown, the connecting rod 221 is a lead screw, and the connecting piece 222 is a nut. Both the lead screw and the nut are common and frequently used accessories, reducing customization requirements, shortening the supply chain cycle, improving production efficiency, and reducing production costs.

[0045] Furthermore, such as Figure 3 As shown, the projection of the support frame 2 along the third direction Z onto the base plate 1 is located within the base plate 1. By placing the support frame 2 within the range of the base plate 1, the larger base plate 1 has higher self-weight and stability, remaining fixed during cell testing, thus improving testing stability and safety.

[0046] In summary, this utility model embodiment provides a battery cell thermal stability testing device. The test battery cell 3 is placed in the battery cell insertion port 223, and the pressure plate 23 presses the test battery cell 3 firmly to prevent it from moving during the test, ensuring the stability and safety of the test. The test battery cell 3 is located between the first connecting rod 22 and the second connecting rod 27. The test battery cell 3 does not contact the first connecting rod 22 and the second connecting rod 27 during the test to avoid interference with the expansion of the test battery cell 3 during the test, thus improving the accuracy of the test results. The two ends of the second connecting rod 27 are respectively inserted through the first through hole 231 and the second through hole 2411 at another location and are detachably connected to the pressure plate 23 and the support bracket 24. This allows for adjustment of the dimensions of the pressure plate 23 and the support bracket 24 in the height direction to meet the testing needs of battery cells with different Z dimensions in the third direction, improving the versatility of the test. Meanwhile, since multiple first through holes 231 and second through holes 2411 are spaced apart along the first direction X, the distance between the first connecting rod 22 and the second connecting rod 27 in the same support frame 2 can be adjusted to accommodate the testing of battery cells with different sizes in the first direction X. Each bearing bracket 24 is connected to the slide groove 131 at intervals, and the test battery cells 3 are respectively inserted through multiple battery cell insertion ports 223. Multiple support frames 2 support and clamp the test battery cells 3, improving the stability and reliability of the battery cell fixation and further enhancing the testing safety. At the same time, adjacent support frames 2 can slide along the slide groove 131 to adjust the distance between them in the second direction Y, thereby accommodating the testing of battery cells with different sizes in the second direction Y, demonstrating strong adaptability.

[0047] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A battery cell thermal stability testing device, wherein the battery cell thermal stability testing device has a first direction (X), a second direction (Y), and a third direction (Z) that intersect each other in pairs, characterized in that: The device includes a base plate (1) and at least two support frames (2). Each support frame (2) includes a first connecting rod (22), a second connecting rod (27), a pressure plate (23), and a bearing bracket (24). The pressure plate (23) has multiple first through holes (231), and the bearing bracket (24) has multiple second through holes (2411) corresponding to the positions of the first through holes (231). The multiple first through holes (231) and second through holes (2411) are respectively spaced along the first direction (X). The two ends of the first connecting rod (22) are detachably connected to the first through hole (231) and the second through hole (2411) corresponding to the positions. The two ends of the second connecting rod (27) are detachably connected to the first through hole (231) and the second through hole (2411) corresponding to another position. A cell insertion port (223) is formed between the first connecting rod (22) and the second connecting rod (27). The base plate (1) is provided with a groove (131) extending along the second direction (Y). Each of the bearing brackets (24) is slidably connected to the groove (131) at intervals along the second direction (Y). The battery cell insertion port (223) of the adjacent support frame (2) is in the same position in the first direction (X). A first injection port (21) is formed between the adjacent support frames (2).

2. The cell thermal stability testing device according to claim 1, characterized in that: The two adjacent support frames (2) are configured as a first support frame (25) and a second support frame (26). The pressure plate (23) of the first support frame (25) forms a first pressure surface (251) between the first connecting rod (22) and the second connecting rod (27). The bearing bracket (24) of the first support frame (25) forms a first bearing surface (252) between the first connecting rod (22) and the second connecting rod (27). The pressure plate (23) of the second support frame (26) forms a second pressure surface (261) between the first connecting rod (22) and the second connecting rod (27). The bearing bracket (24) of the second support frame (26) forms a second bearing surface (262) between the first connecting rod (22) and the second connecting rod (27). The first pressure surface (251), the first bearing surface (252), the second pressure surface (261), and the second bearing surface (262) are respectively used to press against the test cell (3).

3. The cell thermal stability testing device according to claim 1, characterized in that: The base plate (1) is provided with a second spray port (111), which is provided in the third direction (Z) corresponding to the first spray port (21). The second spray port (111) and the first spray port (21) are connected to form a spray channel (11).

4. The cell thermal stability testing device according to claim 3, characterized in that: The base plate (1) includes a plate body (12) and a slide rail (13). The second injection port (111) is opened on the plate body (12). The slide rail (13) is connected to the plate body (12) on one side of the second injection port (111). The slide groove (131) is opened on the slide rail (13).

5. The cell thermal stability testing device according to claim 1, characterized in that: The support bracket (24) includes a support plate (241) and a bracket (242). The support plate (241) extends along the first direction (X). The second through hole (2411) is opened in the support plate (241). The bracket (242) is located between the support plate (241) and the base plate (1). One end of the bracket (242) is connected to the support plate (241), and the other end is slidably connected to the groove (131).

6. The cell thermal stability testing device according to claim 5, characterized in that: The support bracket (24) further includes a slider (243), which is connected to one end of the bracket (242) facing the base plate (1) and is slidably connected to the groove (131).

7. The cell thermal stability testing device according to claim 6, characterized in that: The slide (131) is a T-shaped slide (131), and the slider (243) is a T-shaped slider (243).

8. The cell thermal stability testing device according to claim 1, characterized in that: The first connecting rod (22) includes a connecting rod body (221) and a connector (222). One end of the connecting rod body (221) is threaded to the bearing bracket (24) through the second through hole (2411), and the other end is threaded to the connector (222) after passing through the first through hole (231). The second connecting rod (27) has the same structure as the first connecting rod (22).

9. The cell thermal stability testing device according to claim 8, characterized in that: The connecting rod (221) is a lead screw, and the connecting piece (222) is a nut.

10. The cell thermal stability testing device according to claim 1, characterized in that: The projection of the support frame (2) along the third direction (Z) onto the base plate (1) is located within the base plate (1).

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