Lithium battery diaphragm hole closing temperature and diaphragm rupture temperature testing device

Abstract

The utility model relates to a lithium battery diaphragm hole closing temperature and diaphragm rupture temperature testing device which comprises a temperature control box, a gas compression device and a measuring device, a placing groove is formed in the temperature control box, the inner side wall of the placing groove is in sliding connection with a placing frame used for placing a diaphragm, a clamping assembly is arranged on the placing frame, and a sealing plate is arranged at the end of the placing frame; the two opposite ends of the sealing plate are slidably connected with bolt plates correspondingly, bolt sleeves matched with the bolt plates in an inserted mode are arranged on the two opposite sides of the outer surface of the temperature control box, and a control assembly is arranged on the sealing plate. The diaphragm detection device has the effect of improving the diaphragm detection efficiency.

Description

Technical Field

[0001] This application relates to the field of membrane testing equipment technology, and in particular to a testing device for the pore-closing temperature and rupture temperature of a lithium battery membrane. Background Technology

[0002] Lithium-ion battery separators are used in batteries to separate the positive and negative electrodes while also conducting ions. When the separator reaches a certain temperature, its micropore structure will close to some extent, thereby cutting off the flow channels of lithium ions and preventing the battery temperature from rising further, ensuring the safety of the lithium-ion battery. This is the pore-closing temperature of the separator. However, if the temperature continues to rise, the separator may melt and break, causing the entire separator to rupture. This would eliminate the function of separating the positive and negative electrodes, and the lithium-ion battery would be prone to runaway. This is the rupture temperature of the separator. Therefore, it is necessary to test the pore-closing temperature and rupture temperature of the separator to ensure the electrical and safety performance of the battery.

[0003] Chinese Patent Publication No. CN207317967U discloses a system for testing closed-cell temperature and membrane rupture temperature, including a heating device, a gas supply device, a jetting device, and a measuring device. During testing, the gas output from the gas supply device is transmitted through a spraying device and the micropores of the diaphragm. The measuring device is used to measure the air permeability of the diaphragm. The heating device continuously changes the ambient temperature of the diaphragm to obtain a curve showing the change of the diaphragm air permeability with temperature. The closed-cell temperature and membrane rupture temperature of the diaphragm are obtained through the inflection point of the curve.

[0004] However, after each test, the heating device is usually at a high temperature. Workers need to wait for the heating device to cool down naturally after taking out the tested diaphragm. Due to the small space inside the heating device, it is extremely inconvenient for workers to take or place the diaphragm, which leads to an overall increase in the testing time of the diaphragm and a decrease in the testing efficiency of the diaphragm, which is obviously insufficient. Utility Model Content

[0005] To improve the testing efficiency of separators, this application provides a testing device for the pore closure temperature and rupture temperature of lithium battery separators.

[0006] The lithium battery separator pore-closure temperature and rupture temperature testing device provided in this application adopts the following technical solution:

[0007] A lithium battery separator pore closure temperature and rupture temperature testing device includes a temperature control chamber, a gas compression device, and a measuring device. The gas compression device has a gas supply pipe at its end, which communicates with the interior of the temperature control chamber. The measuring device monitors the temperature of the temperature control chamber and the air permeability of the separator. The temperature control chamber has a placement slot, and a placement frame for placing the separator is slidably connected to the inner wall of the placement slot. A clamping assembly for clamping the separator is provided on the placement frame. A sealing plate is provided at one end of the placement frame, and pin plates are slidably connected to opposite ends of the sealing plate. Pin sleeves that engage with the pin plates are provided on opposite sides of the outer surface of the temperature control chamber. A control component is provided on the sealing plate to control the pin plates to disengage from or insert into the pin sleeves.

[0008] By adopting the above technical solution, after the test is completed, the worker uses the control component to disengage the pin plate from the pin sleeve, and then pulls the placement frame outward. The placement frame moves the tested diaphragm to the outside of the temperature control chamber. After the worker has taken out and placed the diaphragm, he pushes the placement frame into the temperature control chamber along the placement groove. Finally, the control component drives the pin plate to insert into the pin sleeve to fix the placement frame. This design effectively avoids the worker having to place and take out the diaphragm in a high-temperature and confined environment, significantly improving the convenience of the worker's operation and the efficiency of diaphragm testing.

[0009] Optionally, the control component includes a gear rotatably connected to the outer surface of the sealing plate, the gear having a rack plate meshing with each of the two pin plates, the sealing plate having a sliding groove that slides with the rack plate, the rack plate being disposed at the end corresponding to the pin plate, and each sliding groove having a retaining spring, the spring force of the retaining spring driving the pin plate to insert into the pin sleeve.

[0010] By adopting the above technical solution, when the pin plate needs to be disengaged from the pin sleeve, the worker rotates the gear, which drives the two rack plates to slide towards the gear. The rack plates compress the clamping spring, and the movement of the rack plates causes the pin plate to disengage from the pin sleeve, at which point the placement frame can be pulled out of the temperature control box. When the pin plate needs to be inserted into the pin sleeve, the worker releases the force on the gear, the clamping spring resets, and pushes the rack plates towards the pin sleeve. The rack plates then drive the pin plate to re-insert into the pin sleeve, thus fixing the placement frame. This design enables convenient insertion and removal of the pin plate, making the fixing and pulling out of the placement frame more convenient and further improving the ease of operation for workers.

[0011] Optionally, a sealing ring is provided on the surface of the sealing plate facing the temperature control box, and a sealing groove is provided on the outer surface of the temperature control box to cooperate with the sealing ring.

[0012] By adopting the above technical solution, when the placement frame is pushed into the temperature control box, the sealing ring is embedded in the sealing groove, thereby effectively filling the gap between the sealing plate and the outer surface of the temperature control box, effectively preventing the leakage of gas inside the temperature control box, ensuring that the gas in the gas delivery pipe passes accurately through the diaphragm micropores, thereby improving the accuracy of the test results.

[0013] Optionally, the clamping assembly includes a pressure plate slidably connected to opposite sides of the placement frame. A drive groove is provided on the opposite inner sidewall of the placement frame. A screw is rotatably connected in each drive groove. A connecting block that slides with the drive groove is threaded onto the screw. The cross-section of the connecting block and the drive groove is square. The connecting block is disposed on the pressure plate. A turn wheel is coaxially disposed at the end of the screw. A turn groove that rotates with the turn wheel is provided on the placement frame.

[0014] By adopting the above technical solution, when placing the diaphragm, the worker turns the turn wheel to drive the screw to rotate. The screw drives the clamping plate to move towards the diaphragm through the connecting block. When both clamping plates abut against the diaphragm surface, the diaphragm is pressed into the placement frame by the clamping plates. The clamping assembly fixes the diaphragm, effectively reducing the possibility of displacement of the diaphragm when gas passes through, ensuring the stability of the diaphragm test area, and thus further improving the accuracy of the test results.

[0015] Optionally, the surfaces of the clamping plates facing the diaphragm are provided with rubber pads.

[0016] By adopting the above technical solution, the anti-slip texture of the rubber pad can effectively increase the friction between the pressure plate and the diaphragm, thereby further reducing the possibility of diaphragm displacement during the test.

[0017] Optionally, the temperature control box is provided with an air supply plate and an air baffle plate, which are respectively tightly attached to opposite ends of the placement frame. The temperature control box is provided with a main air pipe, the air inlet of which is connected to the air supply pipe, and the air outlet of which is connected to multiple branch air pipes. The air supply plate has an air cavity that is connected to the multiple branch air pipes. The surface of the air supply plate facing the placement frame has multiple air inlets that are connected to the air cavities. The multiple air inlets are evenly arranged in an array. The air baffle plate has an air outlet, and the temperature control box is provided with an air outlet that is connected to the air outlet.

[0018] By adopting the above technical solution, when the placement frame containing the diaphragm to be tested enters the temperature control chamber, the gas compression device delivers gas to the gas supply pipe. The gas moves along the gas supply pipe to the main gas pipe, and then flows into the gas chamber through multiple gas distribution pipes. Subsequently, it is evenly blown onto the diaphragm through multiple gas outlets, and finally flows to the gas outlet pipe through the diaphragm micropores. The arrangement of multiple gas distribution pipes and gas outlets ensures that the airflow is evenly directed to the diaphragm, avoiding local bulging of the diaphragm due to uneven gas flow, thereby ensuring the stability and integrity of the diaphragm during the testing process.

[0019] Optionally, each of the gas distribution pipes is equipped with a gas flow meter, and a solenoid valve is installed on the gas distribution pipe. The gas flow meter is electrically connected to the solenoid valve through a control system.

[0020] By adopting the above technical solution, when the gas flow meter detects that the gas flow rate in each gas distribution pipe is the same, the gas flow meter controls the corresponding solenoid valve to open. At this time, the gas flows through the gas distribution pipe into the gas chamber. This setting further ensures that the airflow blown onto the diaphragm through the gas outlet remains uniform, avoiding different airflow impacts on the diaphragm due to inconsistent gas flow rates in the gas distribution pipe, thereby further improving the accuracy of the test results.

[0021] Optionally, sealing strips are provided on both sides of the upper and lower end faces of the placement frame, and sealing grooves that slide with the sealing strips are provided on the air supply plate and the air isolation plate.

[0022] By adopting the above technical solution, when the placement frame is installed in the temperature control box, the sealing strip is embedded in the sealing groove, which effectively prevents gas leakage at the connection between the gas supply plate, the gas isolation plate and the placement frame. This avoids problems such as uneven airflow and unstable pressure caused by gas leakage, ensuring the stability and accuracy of the test environment, thereby improving the accuracy of the test results.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. In this embodiment of the application, a placement frame and a control component are slidably connected inside the temperature control chamber. After the test is completed, the worker uses the control component to disengage the pin plate from the pin sleeve and then pulls the placement frame outward. The placement frame moves the tested diaphragm to the outside of the temperature control chamber. After the worker has picked up and placed the diaphragm, the placement frame is pushed into the temperature control chamber along the placement groove. Finally, the control component drives the pin plate to insert into the pin sleeve to fix the placement frame. This design effectively avoids the worker from placing and picking up the diaphragm in a high-temperature and confined environment, significantly improving the convenience of the worker's operation and the efficiency of diaphragm testing.

[0025] 2. In this embodiment, by setting up multiple gas distribution pipes and gas inlets, when the placement frame containing the diaphragm to be tested enters the temperature control chamber, the gas compression device delivers gas to the gas supply pipe. The gas moves along the gas supply pipe to the main gas pipe, then flows into the gas chamber through multiple gas distribution pipes, and then is evenly blown onto the diaphragm through multiple gas inlets. Finally, it flows to the gas outlet pipe through the micropores of the diaphragm. The setting of multiple gas distribution pipes and gas inlets ensures that the airflow is evenly directed towards the diaphragm, avoiding local bulging of the diaphragm due to uneven gas flow, thereby ensuring the stability and integrity of the diaphragm during the testing process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this application.

[0027] Figure 2 This is a cross-sectional view of the placement groove in an embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the clamping assembly in an embodiment of this application.

[0029] Figure 4 This is a cross-sectional view of the air supply plate and the air baffle plate in the embodiments of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Temperature control box; 101. Placement slot; 102. Sealing slot; 2. Gas compression device; 21. Gas delivery pipe; 3. Measuring device; 31. Temperature detection element; 32. Gas flow detection element; 4. Placement frame; 41. Sealing plate; 411. Sealing ring; 412. Sliding slot; 42. Drive slot; 43. Actuating slot; 5. Clamping assembly; 51. Pressure plate; 511. Rubber pad; 52. Screw; 53. Actuating wheel; 6. Pin plate; 61. Pin sleeve; 7. Control assembly; 71. Gear; 72. Rack plate; 73. Pressing spring; 8. Gas delivery plate; 81. Gas chamber; 82. Gas delivery port; 9. Air barrier plate; 10. Main gas pipe; 11. Branch gas pipe; 111. Gas flow meter; 112. Solenoid valve; 12. Gas outlet pipe; 45. Sealing strip; 13. Sealing slot. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0032] This application discloses a device for testing the pore-closure temperature and rupture temperature of a lithium battery separator.

[0033] Reference Figure 1 and Figure 2A lithium battery separator pore closure temperature and rupture temperature testing device includes a temperature control box 1, a gas compression device 2 and a measuring device 3. The temperature control box 1 and the gas compression device 2 are existing heating devices and gas supply devices, respectively. The specific principles will not be described in detail here. The end of the gas compression device 2 is connected to a gas supply pipe 21, which is connected to the inside of the temperature control box 1 to supply gas.

[0034] Reference Figure 1 and Figure 2 The temperature control box 1 has a placement slot 101. A placement frame 4 for placing a diaphragm is slidably connected to the inner wall of the placement slot 101. A clamping assembly 5 for clamping the diaphragm is provided on the placement frame 4. A sealing plate 41 is fixedly connected to the end of the placement frame 4. A sealing ring 411 is fixedly connected to the surface of the sealing plate 41 facing the temperature control box 1. A sealing groove 102 that mates with the sealing ring 411 is provided on the outer surface of the temperature control box 1. When the sealing plate 41 is tightly attached to the outer surface of the temperature control box 1, the sealing ring 411 is inserted into the sealing groove 102, thereby effectively filling the gap between the sealing plate 41 and the outer surface of the temperature control box 1 and preventing the leakage of gas inside the temperature control box 1.

[0035] Reference Figure 1 and Figure 2 Two pin plates 6 are slidably connected along the length of the end face of the sealing plate 41 away from the placement frame 4. The two pin plates 6 are respectively set on opposite sides of the sealing plate 41. Pin sleeves 61 corresponding to the two pin plates 6 are fixedly installed on the outer surface of the temperature control box 1. The two pin sleeves 61 are respectively set on both sides of the opening of the placement groove 101. The pin sleeves 61 are inserted and engaged with the corresponding pin plates 6.

[0036] Reference Figure 1 and Figure 2 A control component 7 is provided on the sealing plate 41. The control component 7 includes a gear 71 rotatably connected to the outer surface of the sealing plate 41. A handle (not shown in the figure) is coaxially fixedly connected to the gear 71. A rack plate 72 corresponding to the two pin plates 6 is meshed on the gear 71. The rack plates 72 are respectively located on opposite sides of the gear 71. A sliding groove 412 is provided on the sealing plate 41 to slide with the rack plate 72. The rack plate 72 is fixedly connected to the end of the corresponding pin plate 6. A retaining spring 73 is provided in each sliding groove 412. One end of the retaining spring 73 is fixedly connected to the inner wall of the sliding groove 412 near the gear 71, and the other end is fixedly connected to the rack plate 72. The elastic force of the retaining spring 73 drives the pin plate 6 to insert into the pin sleeve 61.

[0037] After the test is completed, the worker rotates gear 71 clockwise. Gear 71 drives two rack plates 72 to slide towards gear 71. The rack plates 72 compress the clamping spring 73, causing the pin plate 6 to disengage from the pin sleeve 61. The fixed state of the placement frame 4 is released. Then, the placement frame 4 is pulled outward, moving the tested diaphragm to the outside of the temperature control chamber 1. After the worker has taken out and placed the diaphragm, the control component 7 keeps the pin plate 6 disengaged from the pin sleeve 61 and facing inward towards the temperature control chamber 1. The placement frame 4 is pushed in the direction of the part. After the placement frame 4 is fully inserted into the placement slot 101, the worker releases the force on the gear 71, and the spring 73 is reset to push the rack plate 72 toward the pin sleeve 61. The rack plate 72 drives the pin plate 6 to re-insert into the pin sleeve 61, thus fixing the placement frame 4. The placement frame 4 and the control component 7 effectively avoid the worker from placing and taking out the diaphragm in a high-temperature and confined environment, which significantly improves the convenience of the worker's operation and improves the detection efficiency of the diaphragm.

[0038] Reference Figure 3 and Figure 4 The clamping assembly 5 includes a pressure plate 51 slidably connected to opposite sides of the placement frame 4. Rubber pads 511 are fixedly connected to the surface of the pressure plate 51 facing the diaphragm. A drive groove 42 is provided on the opposite inner sidewall of the placement frame 4. The drive groove 42 is vertically arranged. A screw 52 is rotatably connected in each drive groove 42. A connecting block (not shown in the figure) is threadedly connected to the screw 52 and slides with the drive groove 42. The cross-section of the connecting block and the drive groove 42 is square. The connecting block is fixedly connected to the pressure plate 51. A turn wheel 53 is coaxially fixedly connected to the end of the screw 52. A turn groove 43 is provided on the placement frame 4 and rotates with the turn wheel 53.

[0039] The worker rotates the screw 52 by turning the actuating wheel 53 in the forward or reverse direction. The screw 52 drives the clamping plate 51 to move towards or away from the diaphragm through the connecting block. When the rubber pads 511 on both clamping plates 51 are in contact with the diaphragm surface, the diaphragm is pressed into the placement frame 4 by the clamping plates 51, effectively reducing the displacement of the diaphragm when gas passes through. When the clamping plate 51 is separated from the diaphragm, the fixing effect of the clamping assembly 5 disappears, and the worker removes the diaphragm from between the clamping plate and the placement frame 4.

[0040] Reference Figure 3 and Figure 4The temperature control box 1 is fixedly connected to an air supply plate 8 and an air isolation plate 9. The air supply plate 8 and the air isolation plate 9 are respectively tightly attached to the opposite ends of the placement frame 4. The temperature control box 1 is fixedly connected to a main air pipe 10. The air inlet end of the main air pipe 10 is connected to the air outlet end of the air supply pipe 21. The air outlet end of the main air pipe 10 is connected to and installed with multiple branch air pipes 11. In this embodiment, there are three branch air pipes 11. The air supply plate 8 is provided with an air cavity 81 that communicates with the three branch air pipes 11. The surface of the air supply plate 8 facing the placement frame 4 is provided with multiple air supply ports 82 that communicate with the air cavity 81. The multiple air supply ports 82 are arranged in an array evenly.

[0041] Reference Figure 3 and Figure 4 Each gas distribution pipe 11 is fixedly installed with a gas flow meter 111, and each gas distribution pipe 11 is fixedly installed with a solenoid valve 112. The gas flow meter 111 is electrically connected to the solenoid valve 112 through the control system.

[0042] Reference Figure 3 and Figure 4 An air outlet (not shown in the figure) is provided on the air baffle 9. An air outlet pipe 12 communicating with the air outlet is fixedly installed inside the temperature control box 1. The measuring device 3 includes a temperature detection element 31 and a gas flow detection element 32. In this embodiment, the temperature detection element 31 is used to monitor the temperature inside the temperature control box 1. The temperature detection element 31 is fixedly installed on the inner side wall of the temperature control box 1. The gas flow detection element 32 is used to detect the air permeability of the diaphragm. Gas flow detection elements 32 are installed inside both the main air pipe 10 and the air outlet pipe 12. The gas flow detection element 32 can be a gas flow meter 111.

[0043] When the placement frame 4 containing the diaphragm to be tested enters the temperature control chamber 1, the gas compression device 2 starts and transmits gas to the gas supply pipe 21. The gas flows through the gas supply pipe 21 to the main gas pipe 10, and then flows to the three distribution pipes 11. When the gas flow meter 111 detects that the gas flow rate in each distribution pipe 11 is the same, the gas flow meter 111 controls the corresponding solenoid valve 112 to open. At this time, the gas flows through the distribution pipe 11 to the gas chamber 81, and then blows evenly onto the diaphragm through multiple gas outlets 82, and finally flows through the diaphragm micropores to the outlet pipe 12. The arrangement of multiple distribution pipes 11 and gas outlets 82 ensures that the airflow flows evenly to the diaphragm, avoiding local bulging of the diaphragm due to uneven gas flow, thereby ensuring the stability and integrity of the diaphragm during the test.

[0044] Reference Figure 3 and Figure 4Sealing strips 45 are fixedly connected to the opposite sides of the upper and lower surfaces of the placement frame 4. Sealing grooves 13 that cooperate with the sealing strips 45 are opened on the opposite sides of the gas supply plate 8 and the gas isolation plate 9. When the placement frame 4 is installed into the temperature control box 1, the sealing strips 45 on the placement frame 4 are embedded in the sealing grooves 13 respectively, effectively preventing gas leakage at the connection between the gas supply plate 8, the gas isolation plate 9 and the placement frame 4, avoiding problems such as uneven airflow and unstable pressure caused by gas leakage, and ensuring the stability and accuracy of the test environment.

[0045] The implementation principle of the lithium battery separator pore closure temperature and rupture temperature testing device in this application embodiment is as follows: After the test is completed, the worker rotates the gear 71 forward. The gear 71 drives the two rack plates 72 to slide towards the gear 71. The rack plates 72 compress the clamping spring 73, and the rack plates 72 drive the pin plate 6 to disengage from the pin sleeve 61. The fixed state of the placement frame 4 is released. Then, the placement frame 4 is pulled outward. The placement frame 4 moves the tested separator to the outside of the temperature control box 1. After the worker takes and places the separator, the control component 7 keeps the pin plate 6 detached. The pin sleeve 61 is in a certain state, and the placement frame 4 is pushed towards the inside of the temperature control box 1. When the placement frame 4 is fully inserted into the placement slot 101, the worker releases the force on the gear 71, the spring 73 is pressed back and reset, and the rack plate 72 is pushed towards the pin sleeve. The rack plate 72 drives the pin plate 6 to re-insert into the pin sleeve 61, thus fixing the placement frame 4. The placement frame 4 and the control component 7 effectively avoid the worker from placing and taking out the diaphragm in a high-temperature and confined environment, which significantly improves the convenience of the worker's operation and improves the detection efficiency of the diaphragm.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lithium battery separator pore closure temperature and rupture temperature testing device, comprising a temperature control chamber (1), a gas compression device (2), and a measuring device (3), wherein the gas compression device (2) is provided with a gas supply pipe (21) at its end, the gas supply pipe (21) being connected to the interior of the temperature control chamber (1), and the measuring device (3) being used to monitor the temperature of the temperature control chamber (1) and the air permeability of the separator, characterized in that, The temperature control box (1) is provided with a placement slot (101). A placement frame (4) for placing a diaphragm is slidably connected to the inner side wall of the placement slot (101). A clamping component (5) for clamping the diaphragm is provided on the placement frame (4). A sealing plate (41) is provided at the end of the placement frame (4). A pin plate (6) is slidably connected to the opposite ends of the sealing plate (41). Pin sleeves (61) that are inserted into the pin plate (6) are provided on the opposite sides of the outer surface of the temperature control box (1). A control component (7) for controlling the pin plate (6) to disengage from or insert into the pin sleeve (61) is provided on the sealing plate (41).

2. The lithium battery separator pore-closing temperature and rupture temperature testing device according to claim 1, characterized in that, The control component (7) includes a gear (71) rotatably connected to the outer surface of the sealing plate (41). The gear (71) is fitted with a rack plate (72) corresponding to the two pin plates (6). The sealing plate (41) is provided with a sliding groove (412) that slides with the rack plate (72). The rack plate (72) is located at the end of the corresponding pin plate (6). Each sliding groove (412) is provided with a retaining spring (73). The elastic force of the retaining spring (73) drives the pin plate (6) to be inserted into the pin sleeve (61).

3. The lithium battery separator pore closure temperature and rupture temperature testing device according to claim 1, characterized in that, The sealing plate (41) has a sealing ring (411) on its surface facing the temperature control box (1), and the outer surface of the temperature control box (1) has a sealing groove (102) that cooperates with the sealing ring (411).

4. The lithium battery separator pore-closing temperature and rupture temperature testing device according to claim 1, characterized in that, The clamping assembly (5) includes a pressure plate (51) slidably connected to opposite sides of the placement frame (4). A drive groove (42) is provided on the opposite inner sidewall of the placement frame (4). A screw (52) is rotatably connected in each drive groove (42). A connecting block that slides with the drive groove (42) is threaded onto the screw (52). The cross-section of the connecting block and the drive groove (42) is square. The connecting block is set on the pressure plate (51). A turn wheel (53) is coaxially provided at the end of the screw (52). A turn groove (43) that rotates with the turn wheel (53) is provided on the placement frame (4).

5. The lithium battery separator pore closure temperature and rupture temperature testing device according to claim 4, characterized in that, The surface of the clamping plate (51) facing the diaphragm is provided with rubber pads (511).

6. The lithium battery separator pore-closing temperature and rupture temperature testing device according to claim 1, characterized in that, The temperature control box (1) is provided with an air supply plate (8) and an air baffle plate (9). The air supply plate (8) and the air baffle plate (9) are respectively tightly attached to the opposite ends of the placement frame (4). The temperature control box (1) is provided with a main air pipe (10). The air inlet end of the main air pipe (10) is connected to the air supply pipe (21), and the air outlet end is connected to multiple branch air pipes (11). The air supply plate (8) is provided with an air cavity (81) connected to multiple branch air pipes (11). The surface of the air supply plate (8) facing the placement frame (4) is provided with multiple air inlets (82) connected to the air cavity (81). The multiple air inlets (82) are arranged in an array evenly. The air baffle plate (9) is provided with an air outlet. The temperature control box (1) is provided with an air outlet pipe (12) connected to the air outlet.

7. The lithium battery separator pore-closing temperature and rupture temperature testing device according to claim 6, characterized in that, Each of the gas distribution pipes (11) is equipped with a gas flow meter (111), and a solenoid valve (112) is installed on the gas distribution pipe (11). The gas flow meter (111) is electrically connected to the solenoid valve (112) through a control system.

8. The lithium battery separator pore closure temperature and rupture temperature testing device according to claim 6, characterized in that, Sealing strips (45) are provided on both sides of the upper and lower end faces of the placement frame (4), and sealing grooves (13) that slide with the sealing strips (45) are provided on the air supply plate (8) and the air isolation plate (9).

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