Lithium battery diaphragm porosity testing device

Abstract

The utility model relates to a lithium battery diaphragm porosity testing device which comprises a frame body, a testing assembly is arranged on the frame body and comprises a first pressing block, a second pressing block, a liquid storage pipe and a liquid storage tank, a first air hole is formed in the first pressing block, a second air hole is formed in the second pressing block, and a groove used for containing a diaphragm is formed in the second pressing block; a sealing ring is arranged on the surface, facing the second pressing block, of the first pressing block, and a sealing groove matched with the sealing ring is formed in the second pressing block. The method has the effect of improving the accuracy of porosity measurement.

Description

Technical Field

[0001] This application relates to the field of lithium battery testing technology, and in particular to a lithium battery separator porosity testing device. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. The separator, as a crucial layer separating the positive and negative electrodes, not only needs to prevent direct contact between the two electrodes to avoid short circuits, but also needs to provide transport channels for electrolyte ions. Among these, the porosity of the separator is the core parameter determining its performance: higher porosity means more micropores per unit area, resulting in smoother ion migration paths, significantly reducing internal resistance and improving charge / discharge efficiency; conversely, insufficient porosity may hinder ion transport, exacerbate battery heating, and even cause safety hazards.

[0003] Chinese Patent Publication No. CN203758885U discloses a membrane air permeability tester. This instrument utilizes a U-shaped liquid storage tube, a first pressure block, and a second pressure block to drive air through the membrane using a water level difference, indirectly assessing porosity by measuring the air permeation time. Specifically, the membrane under test is sandwiched between the air inlets of the two pressure blocks. When a water level difference is created at the first end of the liquid storage tube due to a positional change, air must enter the second end of the liquid storage tube through the second air inlet of the second pressure block, the micropores of the membrane, and the first air inlet of the first pressure block. The porosity of the membrane is determined by recording the time it takes for the water level to drop from the initial height to the target height.

[0004] However, when the first and second pressure blocks are attached, there may be a gap between them. During testing, gas is prone to leak from the gap at the edge of the pressure block to the outside, rather than all of it permeating through the micropores of the diaphragm. This results in the actual amount of gas entering the liquid storage tube being less than the theoretical value, causing a deviation in the measurement of the permeability time, which in turn reduces the accuracy of the porosity measurement and has obvious shortcomings. Utility Model Content

[0005] To improve the accuracy of porosity measurement, this application provides a lithium battery separator porosity testing device.

[0006] The lithium battery separator porosity testing device provided in this application adopts the following technical solution:

[0007] A lithium battery separator porosity testing device includes a frame on which a testing component is mounted. The testing component includes a first pressure block, a second pressure block, a liquid storage tube, and a liquid storage tank. The first pressure block has a first vent, and the second pressure block has a second vent. The second pressure block has a groove for placing the separator. The frame is provided with a driving member that drives the first pressure block to move toward the second pressure block. The liquid storage tube connects the second vent and the liquid storage tank. A sealing ring is provided on the surface of the first pressure block facing the second pressure block. A sealing groove that mates with the sealing ring is provided on the second pressure block. The sealing ring is made of an elastic material, and both the sealing ring and the sealing groove have a tapered cross-section.

[0008] By adopting the above technical solution, when the driving component drives the first pressure block to move toward the second pressure block, the sealing ring gradually inserts into the sealing groove. At the same time, under the pressure of the driving component, the sealing ring undergoes elastic deformation and tightly fills the gap between itself and the inner wall of the sealing groove, thereby effectively filling the gap between the first pressure block and the second pressure block, preventing gas from leaking from the gap, and ensuring that gas can only enter the liquid storage tube through the first pore, the diaphragm micropore and the second pore during the test, thereby improving the accuracy of the porosity test results.

[0009] Optionally, the second pressing block is provided with an adsorption cavity, the adsorption cavity is annular and located on the outer periphery of the groove, and a plurality of adsorption holes communicating with the adsorption cavity are provided on the bottom wall of the groove. The second pressing block is provided with an inflation and deflation assembly for inflating and deflating the adsorption cavity.

[0010] By adopting the above technical solution, before testing, the diaphragm is placed inside the groove, and then the gas filling and degassing component degassing the adsorption chamber, thereby creating a negative pressure at multiple adsorption pores in the adsorption chamber, which tightly adsorbs and fixes the diaphragm in the groove, preventing the diaphragm from shifting during the pressing process, ensuring that the diaphragm test area is flat and stably attached between the first pore and the second pore, thereby further improving the accuracy of the porosity test results.

[0011] After the test, the inflation and deflation assembly inflates the adsorption chamber, creating positive pressure. The airflow from the adsorption chamber blows towards the adsorption holes and acts on the diaphragm, lifting the diaphragm from the groove and separating it from the bottom wall of the groove. This prevents the diaphragm from sticking to the groove due to electrostatic adsorption or residual pressure, making it easier for operators to quickly and completely remove the diaphragm, thus improving the convenience and safety of the test operation.

[0012] Optionally, the inflation / deflation assembly includes an air cylinder disposed on the outer surface of the second pressure block. The air cylinder is connected to the adsorption chamber via an air pipe. A piston rod is slidably connected inside the air cylinder. A sliding groove is formed on the outer surface of the second pressure block. A lead screw is rotatably connected inside the sliding groove. A moving block that slides with the sliding groove is threaded onto the lead screw. Both the moving block and the sliding groove have square cross-sections. The moving block is disposed at the end of the piston rod extending to the outside of the air cylinder.

[0013] By adopting the above technical solution, during the evacuation process, the tester rotates the screw forward, causing the moving block to move away from the air cylinder. The moving block drives the piston rod to move inside the air cylinder, thereby increasing the air chamber and decreasing the air pressure. The adsorption chamber and the air cylinder form a negative pressure passage through the air pipe, and the diaphragm is flattened and adsorbed onto the bottom wall of the groove under the negative pressure of the adsorption hole. During the delivery process, the tester rotates the screw in the reverse direction, causing the moving block to move closer to the air cylinder. The moving block drives the piston rod to push the gas inside the air cylinder into the adsorption chamber, forming an upward airflow through the adsorption hole, which acts evenly on the bottom surface of the diaphragm, causing it to separate from the groove.

[0014] Optionally, the outer surface of the second pressure block is provided with a plurality of guide posts, and the first pressure block is provided with guide holes that slide in cooperation with the guide posts.

[0015] By adopting the above technical solution, the sliding fit between the guide post and the guide hole provides precise guidance for the movement trajectory of the first pressure block, ensuring that the first pressure block moves smoothly in a direction perpendicular to the second pressure block under the action of the driving component. This avoids the first pressure block tilting or shifting due to the lateral force generated during the driving process, thereby ensuring that the diaphragm test area is always in the exact middle position between the first and second air holes, further improving the accuracy of the test results.

[0016] Optionally, the frame is equipped with an adjustment assembly, which includes an adjustment motor mounted on the frame. An adjustment screw is coaxially mounted on the output shaft of the adjustment motor. The adjustment screw is rotatably connected to the outer surface of the frame, and a connecting frame is threaded onto the adjustment screw. An adjustment groove with a square cross-section is provided on the frame to slide against the connecting frame. A positioning ring is mounted on the connecting frame and fitted onto the outer surface of the liquid storage tank.

[0017] By adopting the above technical solution, after the diaphragm is fixed, the adjusting motor drives the adjusting screw to rotate, causing the connecting frame to move along the length of the adjusting groove, thereby driving the liquid storage tank to achieve height adjustment. The setting of the adjusting component realizes the automatic change of the height position of the liquid storage tube. At the same time, the positioning ring has a circumferential limiting effect on the liquid storage tank, preventing the liquid storage tank from shaking or shifting during the adjustment process, ensuring the stability of the liquid storage tube when moving, and reducing the possibility of the liquid storage tank shaking due to manual operation, which may lead to a decrease in the accuracy of the test results.

[0018] Optionally, the connecting frame is provided with a support assembly, which includes a support frame disposed above the positioning ring. Support arc plates are slidably connected to opposite sides of the support frame. A bidirectional lead screw and a guide rod are disposed inside the support frame. One end of each of the two support arc plates is threaded to the two ends of the bidirectional lead screw with opposite thread directions, and the other end is slidably connected to the guide rod. A handwheel for driving the bidirectional lead screw to rotate is disposed on the outer surface of the support frame.

[0019] By adopting the above technical solution, after the bottom of the storage tank is placed inside the positioning ring, the tester turns the handwheel to drive the bidirectional lead screw to rotate. The two support arc plates move along the guide rod in a direction that approaches each other. When both support arc plates are in contact with the outer surface of the storage tank, further stable support is achieved on both sides of the storage tank, thereby further reducing the possibility of shaking or tilting of the storage tank during the test, ensuring the stability of the water level difference during the test, and thus improving the accuracy of the test results.

[0020] Optionally, rubber pads are provided on the opposite end faces of the two supporting arc plates, and the rubber pads abut against the outer surface of the liquid storage tank.

[0021] By adopting the above technical solution, the rubber pad is used to fit tightly against the liquid storage tank and evenly distribute the clamping force, avoiding surface wear or indentation caused by rigid contact between the support arc plate and the liquid storage tank. At the same time, the anti-slip texture of the rubber pad can effectively increase the friction force, preventing the liquid storage tank from shifting due to vibration or water level difference during the test, and further improving the stability of the liquid storage tank when moving.

[0022] Optionally, both the second pressure block and the liquid storage tank are provided with threaded joints, and the two opposite ends of the liquid storage tube are respectively threaded to the threaded joints.

[0023] By adopting the above technical solution, the threaded joint enables the liquid storage tube to be disassembled, which facilitates the timely replacement of damaged liquid storage tubes by testers and improves the convenience of worker operation.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. In this embodiment of the application, by setting a sealing ring and a sealing groove, the cooperation of the sealing ring and the sealing groove effectively fills the gap between the first pressure block and the second pressure block, preventing gas from leaking from the gap, and ensuring that gas can only enter the interior of the liquid storage tube through the first pore, the diaphragm micropore and the second pore during the test, thereby improving the accuracy of the porosity test results;

[0026] 2. This application uses a gas filling and defilling assembly to create a negative or positive pressure in the adsorption chamber, thereby fixing the diaphragm during testing and providing an upward airflow to the diaphragm after testing, making it easy for workers to remove.

[0027] 3. This application provides a support component to further stabilize both sides of the storage tank, thereby reducing the likelihood of shaking or tilting during testing, ensuring the stability of the water level difference during testing, and thus improving the accuracy of the test results. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this application.

[0029] Figure 2 This is a cross-sectional view of the first and second pressing blocks in the embodiments of this application.

[0030] Figure 3 This is a schematic diagram of the structure of the support component in the embodiments of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Test assembly; 21. First pressure block; 22. Second pressure block; 23. Liquid storage pipe; 24. Liquid storage tank; 25. Drive component; 221. Guide column; 211. Guide hole; 212. Sealing ring; 222. Sealing groove; 213. First air hole; 223. Second air hole; 3. Groove; 4. Threaded joint; 5. Adjustment assembly; 6. Adsorption chamber; 31. Adsorption hole; 7. Gas filling and discharging assembly; 71. Air cylinder; 72. Piston rod; 224. Sliding groove; 73. Lead screw; 74. Moving block; 51. Adjusting motor; 52. Adjusting screw; 53. Connecting frame; 101. Adjusting groove; 531. Positioning ring; 8. Support assembly; 81. Support frame; 82. Support arc plate; 821. Rubber pad; 83. Bidirectional lead screw; 84. Guide rod. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0033] This application discloses a lithium battery separator porosity testing device.

[0034] Reference Figure 1 and Figure 2A lithium battery separator porosity testing device includes a frame 1, which is vertically installed on the ground. A testing component 2 is installed on the frame 1. The testing component 2 includes a first pressure block 21, a second pressure block 22, a liquid storage pipe 23, and a liquid storage tank 24. The first pressure block 21 is slidably disposed on the surface of the frame 1, and the second pressure block 22 is fixedly installed on the surface of the frame 1. A driving component 25 is fixedly installed on the frame 1. In this embodiment, the driving component 25 is a linear cylinder. The piston rod of the driving component 25 is fixedly connected to the upper surface of the first pressure block 21. Multiple guide posts 221 are fixedly installed on the second pressure block 22. A guide hole 211 is provided on the first pressure block 21 to slide with the guide post 221.

[0035] Reference Figure 1 and Figure 2 The second pressure block 22 has a groove 3 for placing the diaphragm. A sealing ring 212 is fixedly connected to the surface of the first pressure block 21 facing the second pressure block 22. A sealing groove 222 that cooperates with the sealing ring 212 is provided on the second pressure block 22. The sealing ring 212 is made of elastic material. In this embodiment, the sealing ring 212 is made of rubber. The cross sections of the sealing ring 212 and the sealing groove 222 are both conical.

[0036] Reference Figure 1 and Figure 2 The liquid storage tank 24 is slidably connected to the outer surface of the frame 1 and its opening is open to the atmosphere. The first pressure block 21 has a first air hole 213 at its center and the second pressure block 22 has a second air hole 223 at its center. The bottom surfaces of the second pressure block 22 and the liquid storage tank 24 are both fixedly connected to threaded joints 4. The two opposite ends of the liquid storage pipe 23 are threaded to the threaded joints 4. The liquid storage pipe 23 connects the second air hole 223 to the liquid storage tank 24. The frame 1 is provided with an adjustment component 5, which is used to drive the liquid storage tank 24 to rise and fall in the vertical direction.

[0037] During testing, the diaphragm is placed inside the groove 3, and then the drive unit 25 is activated. The drive unit 25 drives the first pressure block 21 to press against the guide post 221 and move towards the second pressure block 22. At this time, the sealing ring 212 gradually inserts into the sealing groove 222. Simultaneously, under the pressure of the drive unit 25, the sealing ring 212 undergoes elastic deformation and tightly fills the gap between itself and the inner wall of the sealing groove 222, thereby effectively filling the gap between the first pressure block 21 and the second pressure block 22. After fixing, the position and height of the liquid storage tank 24 are changed by adjusting the component 5. When the liquid storage tank 24 moves, the time required for the water level height of the liquid storage tube 23 to change is recorded, thereby determining the porosity of the diaphragm. The setting of the sealing ring 212 and the sealing groove 222 effectively prevents gas from leaking from the gap between the first pressure block 21 and the second pressure block 22, ensuring that gas can only enter the interior of the liquid storage tube 23 through the first pore 213, the diaphragm micropores, and the second pore 223 during the test, thereby improving the accuracy of the porosity test results. The specific measurement principle and formula are existing technology and will not be elaborated here.

[0038] Reference Figure 1 and Figure 2 The second pressure block 22 has an adsorption chamber 6, which is annular and located on the outer periphery of the groove 3. The bottom wall of the groove 3 has multiple adsorption holes 31 that communicate with the adsorption chamber 6. The second pressure block 22 is equipped with a gas filling and emptying assembly 7. Specifically, the gas filling and emptying assembly 7 includes an air cylinder 71 fixedly installed on the outer surface of the second pressure block 22. The air outlet of the air cylinder 71 is connected to an air pipe (not shown in the figure). The air pipe passes through the inner side wall of the second pressure block 22 and communicates with the adsorption chamber 6. A piston rod 72 is slidably connected inside the air cylinder 71. A sliding groove 224 is provided on the outer surface of the second pressure block 22. The length direction of the sliding groove 224 is parallel to the length direction of the air cylinder 71. A lead screw 73 is rotatably connected inside the sliding groove 224. A moving block 74 that slides with the sliding groove 224 is threaded onto the lead screw 73. The cross-section of the moving block 74 and the sliding groove 224 is square. The moving block 74 is fixedly connected to the end of the piston rod 72 that extends to the outside of the air cylinder 71.

[0039] After the diaphragm is placed inside the groove 3, the tester rotates the screw 73 in the forward direction, causing the moving block 74 to move away from the air cylinder 71. The moving block 74 drives the piston rod 72 to move inside the air cylinder 71, thereby increasing the air chamber of the air cylinder 71 and decreasing the air pressure. The adsorption chamber 6 and the air cylinder 71 form a negative pressure passage through the air pipe. Under the negative pressure of the adsorption hole 31, the diaphragm is flatly adsorbed onto the bottom wall of the groove 3, thereby preventing the diaphragm from shifting during the pressing process. This ensures that the diaphragm test area is flat and stably attached between the first air hole 213 and the second air hole 223, thereby further improving the accuracy of the porosity test results.

[0040] After the test, the tester reverses the screw 73 to move the moving block 74 toward the air cylinder 71. The moving block 74 drives the piston rod 72 to push the gas inside the air cylinder 71 toward the adsorption chamber 6, so that the adsorption chamber 6 forms a positive pressure. The adsorption chamber 6 blows air out toward the adsorption hole 31 and acts on the diaphragm, blowing the diaphragm up from the groove 3 and separating it from the bottom wall of the groove 3. This prevents the diaphragm from sticking to the groove 3 due to electrostatic adsorption or residual pressure, making it easier for the operator to quickly and completely remove the diaphragm, thus improving the convenience and safety of the test operation.

[0041] Reference Figure 1 and Figure 3 The adjustment assembly 5 includes an adjustment motor 51 fixedly installed on the frame 1. The output shaft of the adjustment motor 51 is coaxially fixedly connected to an adjustment screw 52. The adjustment screw 52 is rotatably connected to the outer surface of the frame 1. A connecting frame 53 is threadedly connected to the adjustment screw 52. An adjustment groove 101 is provided on the frame 1 to slide with the connecting frame 53. The cross-section of the adjustment groove 101 is square. A positioning ring 531 is fixedly installed at the bottom end of the connecting frame 53. The positioning ring 531 is sleeved on the outer surface of the liquid storage tank 24.

[0042] After the diaphragm is fixed, the adjusting motor 51 drives the adjusting screw 52 to rotate, causing the connecting frame 53 to move along the axis of the adjusting screw 52, ​​thereby driving the liquid storage tank 24 to achieve height adjustment. The setting of the adjusting component 5 realizes the automatic change of the height position of the liquid storage tube 23. At the same time, the positioning ring 531 provides circumferential limiting for the liquid storage tank 24, preventing the liquid storage tank 24 from shaking or shifting during the adjustment process, ensuring the stability of the liquid storage tube 23 when moving, and reducing the possibility of the liquid storage tank 24 shaking due to manual operation, which may lead to a decrease in the accuracy of the test results.

[0043] Reference Figure 1 and Figure 3 A support assembly 8 is provided on the connecting frame 53. The support assembly 8 is located above the positioning ring 531. The support assembly 8 includes a support frame 81 fixedly installed on the outer surface of the connecting frame 53. Support arc plates 82 are slidably connected to opposite sides of the support frame 81 along the length direction. Rubber pads 821 are fixedly connected to opposite surfaces of each support arc plate 82, providing flexible contact for the liquid storage tube 23 through the rubber pads 821. A bidirectional lead screw 83 is rotatably connected to one end of the support frame 81, and a guide rod 84 is fixedly connected to the other end. Both the bidirectional lead screw 83 and the guide rod 84 are parallel to the length direction of the support frame 81. One end of each of the two support arc plates 82 is threadedly connected to the two sections of the bidirectional lead screw 83 with opposite thread directions, and the other end is slidably connected to the guide rod 84. A handwheel (not shown in the figure) is fixedly connected to the outer surface of the support frame 81 to drive the bidirectional lead screw 83 to rotate.

[0044] When installing the liquid storage tank 24, the tester first inserts the bottom of the liquid storage tank 24 into the positioning ring 531, and then turns the handwheel to drive the bidirectional lead screw 83 to rotate. The two support arc plates 82 move along the guide rod 84 toward each other. When the rubber pads 821 on the surface of the two support arc plates 82 are in contact with the outer surface of the liquid storage tank 24, the liquid storage tank 24 is stably supported on both sides, reducing the possibility of the liquid storage tank 24 shaking or tilting during the test.

[0045] The implementation principle of the lithium battery separator porosity testing device in this application embodiment is as follows: During testing, the separator is placed inside the groove 3, and then the driving component 25 is activated. The driving component 25 drives the first pressure block 21 to press against the guide post 221 and move towards the second pressure block 22. At this time, the sealing ring 212 gradually inserts into the sealing groove 222. Simultaneously, under the pressure of the driving component 25, the sealing ring 212 undergoes elastic deformation and tightly fills the gap between itself and the inner wall of the sealing groove 222, thereby effectively filling the gap between the first pressure block 21 and the second pressure block 22. After the gap between the two is fixed, the position and height of the storage tank 24 are changed by adjusting component 5. When the storage tank 24 moves, the time required for the water level of the storage tube 23 to change is recorded, thereby determining the porosity of the diaphragm. The setting of sealing ring 212 and sealing groove 222 effectively prevents gas from leaking from the gap between the first pressure block 21 and the second pressure block 22, ensuring that gas can only enter the interior of the storage tube 23 through the first vent 213, the diaphragm micropores and the second vent 223 during the test, thereby improving the accuracy of the porosity test results.

[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 porosity testing device, comprising a frame (1), characterized in that, The frame (1) is provided with a test assembly (2), which includes a first pressure block (21), a second pressure block (22), a liquid storage tube (23), and a liquid storage tank (24). The first pressure block (21) has a first air hole (213), the second pressure block (22) has a second air hole (223), and the second pressure block (22) has a groove (3) for placing a diaphragm. The frame (1) is provided with a mechanism to drive the first pressure block (21) toward the second pressure block (24). The driving component (25) for moving the pressure block (22), the liquid storage pipe (23) connects the second air hole (223) and the liquid storage tank (24), the first pressure block (21) has a sealing ring (212) on its surface facing the second pressure block, the second pressure block (22) has a sealing groove (222) that cooperates with the sealing ring (212), the sealing ring (212) is made of elastic material, and the cross sections of the sealing ring (212) and the sealing groove (222) are both conical.

2. The device for testing the porosity of a lithium battery separator according to claim 1, wherein, The second pressure block (22) is provided with an adsorption cavity (6), which is annular and located on the outer periphery of the groove (3). The bottom wall of the groove (3) is provided with a plurality of adsorption holes (31) communicating with the adsorption cavity (6). The second pressure block (22) is provided with an inflation and deflation assembly (7) for inflating and deflation of the adsorption cavity (6).

3. The device for testing the porosity of a lithium battery separator according to claim 2, wherein, The inflation / deflation assembly (7) includes an air cylinder (71) disposed on the outer surface of the second pressure block (22). The air cylinder (71) is connected to the adsorption chamber (6) through an air pipe. A piston rod (72) is slidably connected inside the air cylinder (71). A sliding groove (224) is provided on the outer surface of the second pressure block (22). A lead screw (73) is rotatably connected inside the sliding groove (224). A moving block (74) is threaded onto the lead screw (73) and slides in cooperation with the sliding groove (224). The cross-section of the moving block (74) and the sliding groove (224) are both square. The moving block (74) is disposed at the end of the piston rod (72) extending to the outside of the air cylinder (71).

4. The device for testing the porosity of a lithium battery separator of claim 1, wherein, The second pressure block (22) has a plurality of guide posts (221) on its outer surface, and the first pressure block (21) has guide holes (211) that slide with the guide posts (221).

5. The device for testing the porosity of a lithium battery separator of claim 1, wherein, An adjustment assembly (5) is provided on the frame (1). The adjustment assembly (5) includes an adjustment motor (51) provided on the frame (1). An adjustment screw (52) is coaxially provided on the output shaft of the adjustment motor (51). The adjustment screw (52) is rotatably connected to the outer surface of the frame (1). A connecting frame (53) is threadedly connected to the adjustment screw (52). An adjustment groove (101) is provided on the frame (1) and slides with the connecting frame (53). The cross-section of the adjustment groove (101) is square. A positioning ring (531) is provided on the connecting frame (53). The positioning ring (531) is sleeved on the outer surface of the liquid storage tank (24).

6. The lithium battery separator porosity testing device according to claim 5, characterized in that, The connecting frame (53) is provided with a support assembly (8), which includes a support frame (81) located above the positioning ring (531). Support arc plates (82) are slidably connected to opposite sides of the support frame (81). A bidirectional lead screw (83) and a guide rod (84) are provided inside the support frame (81). One end of each of the two support arc plates (82) is threadedly connected to the two sections of the bidirectional lead screw (83) with opposite thread directions, and the other end is slidably connected to the guide rod (84). A handwheel is provided on the outer surface of the support frame (81) to drive the bidirectional lead screw (83) to rotate.

7. The lithium battery separator porosity testing device according to claim 6, characterized in that, Both of the two supporting arc plates (82) are provided with rubber pads (821) on their opposite end faces, and the rubber pads (821) abut against the outer surface of the liquid storage tank (24).

8. The device for testing the porosity of a lithium battery separator according to claim 1, wherein, Both the second pressure block (22) and the liquid storage tank (24) are provided with threaded joints (4), and the two opposite ends of the liquid storage pipe (23) are respectively threaded to the threaded joints (4).

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