Device for detecting puncture resistance of automobile lithium battery diaphragm

Abstract

The invention belongs to the technical field of battery accessory performance detection, particularly relates to an automobile lithium battery diaphragm puncture resistance detection device, and aims to solve the problem that an existing diaphragm puncture resistance detection device cannot perform multi-dimensional puncture resistance detection on a diaphragm, the following scheme is provided: the automobile lithium battery diaphragm puncture resistance detection device comprises a bearing platform, and two symmetrical moving frames are arranged outside the bearing platform; the same multi-dimensional force field simulation module is arranged on the two fixing frames, a puncture rod is arranged on the multi-dimensional force field simulation module, and two symmetrical moving frames are arranged on the bearing platform. According to the device for detecting the puncture resistance of the diaphragm of the automobile lithium battery disclosed by the invention, the diaphragm can be punctured in multiple dimensions when the puncture resistance of the diaphragm is detected, so that forces in different directions can be applied in the puncture process, the stress condition of the diaphragm in actual use can be simulated more truly, the detection comprehensiveness is improved, and the detection efficiency is improved. Real and reliable data are provided for detection, and the credibility of the detection data is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of battery accessory performance testing, and in particular to a device for testing the puncture resistance of automotive lithium battery diaphragms. Background Art

[0002] Lithium battery separator is the inner component of lithium battery. In the structure of lithium battery, separator is one of the key inner components. The performance of separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. Separator with excellent performance plays an important role in improving the comprehensive performance of the battery. The main function of separator is to separate the positive and negative poles of the battery to prevent the two poles from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through.

[0003] Existing diaphragm puncture resistance testing devices can often only perform puncture tests on the diaphragm in the vertical direction when testing the puncture resistance of the diaphragm. The puncture direction is relatively single and cannot effectively simulate the stress conditions of the diaphragm in real situations, thereby reducing the credibility of the test. Summary of the Invention

[0004] The present invention discloses a device for detecting the puncture resistance performance of automotive lithium battery diaphragms, aiming to solve the technical problem in the background art that existing diaphragm puncture resistance performance detection devices cannot perform multi-dimensional puncture resistance detection on diaphragms.

[0005] The present invention provides a device for testing the puncture resistance of automotive lithium battery separators, comprising a support platform, two symmetrical mobile frames provided on the outside of the support platform, two fixed frames provided with the same multi-dimensional force field simulation module, and a puncture rod provided on the multi-dimensional force field simulation module, and two symmetrical mobile frames provided on the support platform, each of which is provided with an adaptive clamping module; The multi-dimensional force field simulation module includes two symmetrical adjustment shafts, and two fixing frames are each provided with a circular hole, the inner wall of each circular hole is movably connected to the outer portion of the adjustment shaft on the same side, and the opposite sides of the two adjustment shafts are fixedly connected with a connector; The adaptive clamping module includes two symmetrical rectangular grooves, and the two rectangular grooves are both arranged on the upper side of the support platform.

[0006] By providing a base, a fixed frame, a movable frame, a puncture rod, a multi-dimensional force field simulation module and an adaptive clamping module, the device utilizes the multi-dimensional force field simulation module to enable the device to perform multi-dimensional puncture on the diaphragm when performing additional testing on the puncture resistance of the diaphragm, thereby being able to apply forces in different directions during the puncture process, more realistically simulating the force conditions of the diaphragm in actual use, improving the comprehensiveness of the test, providing real and reliable data for the additional test, and ensuring the credibility of the test data.

[0007] The lockhole that is formed on the two sides of the lifting link is formed on the upper surface of the second rim and the lower surface of the second rim is fixed with a toothed wheel, and the toothed wheel is connected with the toothed wheel on the upper surface of the second rim. The inner wall is fixedly connected with a circular shaft, and the outside of the circular shaft is movably connected with an inclined plane block 1, and the outside of the circular shaft is slidably connected with an inclined plane block 2, the inclined plane block 2 is symmetrical with the inclined plane block 1, and the bottom of the inclined plane block 2 is fixedly connected to the limited frame, and the inner wall of the limit frame is plugged into the upper side of the puncture rod; a rectangular opening is opened on the outside of the connecting frame, and a short plate is slidably connected in the rectangular opening, and the short plate is fixedly connected to the side opposite to the inclined plane block 2, and the upper side of the short plate is fixedly connected with a spring 2, and one end of the spring 2 away from the short plate is fixedly connected to the outside of the connecting frame; the side of the movable platform close to the annular frame is movably connected to two symmetrical rollers, and the outsides of the rollers are in contact with the inner wall of the groove, and the bottom of the movable platform is fixedly connected to two symmetrical elastic springs, the outsides of the elastic springs are slidably connected to the inner wall of the groove, and one of the annular frames is fixedly connected to a gear ring 2, and the bottom of the movable platform is fixedly connected to a motor 1, and the output end of the motor 1 is connected to a gear 1 through a coupling, and the gear 1 is meshed with the gear ring 2.

[0008] By setting up a multi-dimensional force field simulation module, the multi-dimensional force field simulation module uses a ring frame and a mobile platform to enable the device to quickly and conveniently change the puncture angle of the puncture rod, thereby maximizing the puncture dimension of the puncture rod without changing the restriction conditions on the diaphragm, thereby improving the efficiency of the device in performing diaphragm anti-puncture detection.

[0009] The two gears are connected with each other through the two guide wheels, and the two guide wheels are connected with each other through the two guide wheels, and the two guide wheels are connected with each other through the two guide wheels. The cam is connected to the sliding rod by a spring, and the cam has two guide rails which are respectively provided with a toothed plate and a toothed plate, and the guide rails are connected to the sliding rod by a spring.

[0010] By providing an adaptive clamping module, the adaptive clamping module can quickly control the opening and closing of the clamp using a short axis and a curved groove, thereby reducing the workload of personnel. The rubber strips on the clamp that bite each other can form a zigzag limiting effect on the edge of the diaphragm, thereby avoiding the situation where the diaphragm is pulled out of the clamp by force when the puncture rod punctures the diaphragm, thereby ensuring the normal progress of the puncture detection.

[0011] From the above, it can be seen that the automotive lithium battery diaphragm puncture resistance performance testing device provided by the present invention has the ability to enable the device to perform multi-dimensional puncture on the diaphragm when performing additional testing of the diaphragm puncture resistance, thereby being able to apply forces in different directions during the puncture process, more realistically simulating the force conditions of the diaphragm in actual use, improving the comprehensiveness of the test, providing real and reliable data for additional testing, and ensuring the credibility of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of the vehicle lithium battery separator puncture resistance performance testing device proposed by the present invention; Figure 2This is a schematic diagram of the bottom view of the structure of the vehicle lithium battery separator puncture resistance performance testing device proposed by the present invention; Figure 3 This is a schematic diagram of the structure of the multi-dimensional force field simulation module of the vehicle lithium battery separator puncture resistance performance testing device proposed by the present invention; Figure 4 This is a schematic diagram of the locking rod structure of the vehicle lithium battery separator puncture resistance performance testing device proposed by the present invention; Figure 5 This is a schematic diagram of the structure of the mobile station of the vehicle lithium battery separator puncture resistance testing device proposed by the present invention; Figure 6 This is a schematic diagram of the connection frame structure of the vehicle lithium battery separator puncture resistance performance testing device proposed by the present invention; Figure 7 This is a schematic structural diagram of the adaptive clamping module of the vehicle lithium battery separator puncture resistance testing device proposed by the present invention; Figure 8 This is a schematic diagram of the structure of the mobile frame of the vehicle lithium battery separator puncture resistance testing device proposed by the present invention; Figure 9 This is a schematic diagram of the sliding rod structure of the automotive lithium battery diaphragm puncture resistance performance testing device proposed by the present invention.

[0013] In the figure: 1. Supporting platform; 2. Fixed frame; 3. Moving frame; 4. Puncture rod; 5. Multi-dimensional force field simulation module; 501. Adjusting shaft; 502. Connecting piece; 503. Ring frame; 504. Groove; 505. Moving platform; 506. Gear ring 1; 507. Locking rod; 508. Rack 1; 509. Guide buckle; 510. Spring 1; 511. Roller; 512. Elastic spring; 513. Hydraulic rod; 514. Motor 1; 515. Gear 1; 516. Gear ring 2; 517. Connecting frame; 518. Circular shaft ;519, inclined plane block one; 520, inclined plane block two; 521, spring two; 522, limit frame; 523, fitting groove; 6, adaptive clamping module; 601, rectangular groove; 602, bidirectional screw; 603, motor two; 604, gear two; 605, gear three; 606, fixed shaft; 607, mounting plate; 608, rotating frame; 609, curved groove; 610, gear ring three; 611, limit block; 612, spring three; 613, short shaft; 614, cutting groove; 615, sliding rod; 616, fixture. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] The automotive lithium battery diaphragm puncture resistance performance testing device disclosed in the present invention is mainly used in scenarios where existing diaphragm puncture resistance performance testing devices are unable to perform multi-dimensional puncture resistance testing on the diaphragm.

[0016] Reference Figures 1-9 The device for testing the puncture resistance of the automotive lithium battery separator includes a base 1, two symmetrical mobile frames 3 are provided on the outside of the base 1, the two fixed frames 2 are provided with the same multi-dimensional force field simulation module 5, and the multi-dimensional force field simulation module 5 is provided with a puncture rod 4, and two symmetrical mobile frames 3 are provided on the base 1, and each mobile frame 3 is provided with an adaptive clamping module 6; The multi-dimensional force field simulation module 5 includes two symmetrical adjustment shafts 501. Round holes are formed on both fixing frames 2. The inner walls of the round holes are rotatably connected to the outer surfaces of the adjustment shafts 501 on the same side via bearings. Connectors 502 are bolted to the opposite sides of the two adjustment shafts 501. The adaptive clamping module 6 includes two symmetrical rectangular grooves 601 , and both rectangular grooves 601 are arranged on the upper side of the platform 1 .

[0017] Specifically, when testing the puncture resistance of the lithium battery diaphragm, the adaptive clamping module 6 is used to adjust according to the size of the diaphragm being tested. After the adjustment is completed, the diaphragm is fixed. After fixation, the puncture rod 4 on the multi-dimensional force field simulation module 5 is used to perform multi-angle and multi-directional puncture detection; the device uses the multi-dimensional force field simulation module 5 to enable the device to perform multi-dimensional puncture on the diaphragm when testing the puncture resistance of the diaphragm, so that forces in different directions can be applied during the puncture process, more realistically simulating the force conditions of the diaphragm in actual use, improving the comprehensiveness of the test, providing real and reliable data for the test, and ensuring the credibility of the test data.

[0018] Reference Figure 3 、 Figure 4 、 Figure 5 and Figure 6In a preferred embodiment, two symmetrical annular frames 503 are provided between the two connecting members 502. The two ends of the two connecting members 502 away from the fixing frame 2 are respectively connected to the outside of the two annular frames 503 by bolts. A groove 504 is provided on the opposite side of the two annular frames 503. The outside of one of the adjusting shafts 501 is connected to a gear ring 506 by bolts. The outside of the gear ring 506 is provided with a locking rod 507. The inner wall of the locking rod 507 is connected to a rack 508 by bolts. The rack 508 is clamped with the gear ring 506. The outside of the locking rod 507 is slidably connected to a guide buckle 509. The guide buckle 50 9 is connected with the fixing frame 2 by bolts, and the side of the guide buckle 509 away from the adjusting shaft 501 is connected with a spring 1 510 by bolts, and the end of the spring 1 510 away from the guide buckle 509 is connected with the inner wall of the locking rod 507 by bolts; the same moving platform 505 is set in the two grooves 504, and the moving platform 505 is provided with a circular groove, and the inner wall of the circular groove is connected with a hydraulic rod 513 by bolts. The output end of the hydraulic rod 513 is connected with a connecting frame 517 by bolts, and the bottom of the connecting frame 517 is provided with a fitting groove 523, and the inner wall of the fitting groove 523 is slidably connected to the outer side of the puncture rod 4. The top inner wall of the connecting frame 517 is connected with the outer wall of the puncture rod 4. The wall is connected to a circular shaft 518 by bolts, and the outside of the circular shaft 518 is rotatably connected to an inclined plane block 1 519 through a bearing, and the outside of the circular shaft 518 is slidably connected to an inclined plane block 2 520, and the inclined plane block 2 520 is symmetrical with the inclined plane block 1 519. The bottom of the inclined plane block 2 520 is connected to a limit frame 522 by bolts, and the inner wall of the limit frame 522 is plugged into the upper side of the puncture rod 4; a rectangular opening is provided on the outside of the connecting frame 517, and a short plate is slidably connected to the rectangular opening. The side opposite to the short plate and the inclined plane block 2 520 are connected by bolts, and the upper side of the short plate is connected to a spring 2 521 by bolts, and the end of the spring 2 521 away from the short plate is connected to the connecting frame 51 7 is connected by bolts; the side of the mobile platform 505 close to the annular frame 503 is rotatably connected to two symmetrical rollers 511 through bearings, the outer sides of the rollers 511 are in contact with the inner wall of the groove 504, and the bottom of the mobile platform 505 is connected by bolts with two symmetrical elastic springs 512, the outer sides of the elastic springs 512 are slidably connected to the inner wall of the groove 504, and one of the annular frames 503 is connected to a gear ring 2 516 by bolts, and the bottom of the mobile platform 505 is connected to a motor 1 514 by bolts, and the output end of the motor 1 514 is connected to a gear 1 515 through a coupling, and the gear 1 515 is engaged with the gear ring 2 516.

[0019] Specifically, after the diaphragm is fixed in the device, the position of the puncture rod 4 is kept unchanged, the hydraulic rod 513 is started, the output end of the hydraulic rod 513 is extended, and the puncture rod 4 is driven to approach the diaphragm, and the diaphragm is punctured in a direction perpendicular to the diaphragm. After the puncture, the data is recorded, and the motor 1 514 is started. The motor 1 514 drives the gear 1 515 engaged with the gear ring 2 516 to rotate, so that the movable platform 505 moves in the groove 504 using the spring 1 510, thereby changing the puncture direction of the diaphragm by the puncture rod 4. After multiple punctures with changed positions, the data are recorded. Data, push the locking rod 507 upward so that the rack 1 508 on the locking rod 507 releases the lock on the gear ring 1 506, rotate the adjustment shaft 501, and the adjustment shaft 501 drives the two ring frames 503 to rotate a certain angle so that the puncture rod 4 can form an inclined angle with the diaphragm, loosen the locking rod 507, and under the elastic force of the spring 1 510, the rack 1 508 re-locks the gear ring 1 506, and the adjustment shaft 501 no longer drives the ring frame 503 to rotate, and use the puncture rod 4 to puncture the diaphragm. According to the above steps, perform multiple puncture tests with changing angles.

[0020] In a specific application scenario, the multi-dimensional force field simulation module 5 is mainly suitable for the multi-dimensional force field simulation link in the multi-dimensional force field simulation process, that is, the multi-dimensional force field simulation module 5 uses the annular frame 503 and the movable platform 505 to enable the device to quickly and conveniently change the puncture angle of the puncture rod 4, thereby maximizing the puncture dimension of the puncture rod 4 without changing the restriction conditions on the diaphragm, thereby improving the efficiency of the device in performing diaphragm anti-puncture detection.

[0021] Reference Figure 7 、 Figure 8 and Figure 9In a preferred embodiment, the inner walls of the two rectangular grooves 601 are respectively connected to the outer sides of the two mobile racks 3 in a sliding manner. The mobile racks 3 are each provided with a circular opening, and a same bidirectional screw rod 602 is provided in the circular hole. Both ends of the bidirectional screw rod 602 are rotatably connected to the inner wall of the support platform 1 through bearings. The outer side of the bidirectional screw rod 602 is connected to a gear 3 605 by bolts, and the inner wall of the support platform 1 is connected to a motor 2 603 by bolts. The output end of the motor 2 603 is connected to a gear 2 604 through a coupling. The gear 2 604 and the gear Three 605 meshing; two moving frames 3 are provided with notches, and the notches are connected to fixed shafts 606 by bolts, and the fixed shafts 606 are connected to the mounting plates 607 by bolts on the side away from the moving frame 3, and the mounting plates 607 are provided with two symmetrical slots 614 on the side away from the fixed shaft 606, and the slots 614 are slidably connected to sliding rods 615, and the opposite sides of the two sliding rods 615 on the same side are connected to clamps 616 by bolts, and the opposite sides of the two clamps 616 on the same side are connected to rubber by bolts. The inner wall of the plurality of slots 614 near the movable frame 3 is provided with a cutout, and a short shaft 613 is slidably connected in the cutout. The short shaft 613 is connected to the sliding rod 615 on the opposite side by bolts, and the outsides of the two fixed shafts 606 are rotatably connected to the rotating frame 608 through bearings. The rotating frame 608 is rotatably connected to the mounting plate 607 on the same side on the opposite side by bearings. The rotating frame 608 is provided with two curved grooves 609 equidistantly distributed on the circumference, and the inner walls of the curved grooves 609 are rotatably connected to the same side. The outside of the short shaft 613 on the side is slidably connected; the outside of the two rotating frames 608 are connected to the gear ring three 610 by bolts, and the two mobile frames 3 are provided with narrow openings, and the short rods are slidably connected in the narrow openings, and the ends of the short rods close to the gear ring three 610 are connected to the limiting blocks 611 by bolts, and the outsides of the limiting blocks 611 are clamped with the gear ring three 610 on the same side, and the outsides of the mobile frames 3 are connected with two symmetrical spring three 612 by bolts, and the side of the spring three 612 away from the mobile frame 3 is connected to the outside of the short rod on the same side by bolts.

[0022] Specifically, when the diaphragm needs to be fixed, the motor 2 603 is started, and the motor 2 603 drives the gear 3 605 on the bidirectional screw 602 to rotate, so that the two moving frames 3 can move synchronously on the bidirectional screw 602, so that the clamp 616 on the moving frame 3 moves to the edge of the diaphragm, overcomes the elastic force of the spring 3 612 and gently pushes the limit block 611, so that the limit block 611 releases the lock on the gear ring 3 610, and rotates the rotating frame 608 so that the curved groove 609 on the rotating frame 608 pushes The sliding rod 615 connected to the short shaft 613 slides toward the outside of the mounting plate 607, thereby increasing the spacing between the clamps 616, placing the edge of the diaphragm between the clamps 616, and rotating the rotating frame 608 in the opposite direction. The rotating frame 608 drives the sliding rod 615 to push the clamps 616 to fit together, so that the rubber strip on the clamp 616 bites the edge of the diaphragm and clamps the diaphragm. The limit block 611 is released, and under the elastic force of the spring three 612, the limit block 611 is reset and the gear ring three 610 is locked.

[0023] In a specific application scenario, the adaptive clamping module 6 is mainly suitable for the adaptive clamping link in the adaptive clamping process, that is, the adaptive clamping module 6 can use the short shaft 613 and the curved groove 609 to quickly control the opening and closing of the clamp 616, thereby reducing the workload of personnel, and the rubber strips that bite each other on the clamp 616 can form a zigzag limiting effect on the edge of the diaphragm, thereby avoiding the situation where the diaphragm is pulled out of the clamp 616 by force when the puncture rod 4 punctures the diaphragm, thereby ensuring the normal progress of the puncture detection.

[0024] Working principle: When the diaphragm needs to be fixed, start the motor 2 603, which drives the gear 3 605 on the bidirectional screw 602 to rotate, so that the two moving frames 3 can move synchronously on the bidirectional screw 602, so that the clamp 616 on the moving frame 3 moves to the edge of the diaphragm, overcomes the elastic force of the spring 3 612, and gently pushes the limit block 611, so that the limit block 611 releases the lock on the gear ring 3 610, and rotates the rotating frame 608, so that the curved groove 609 on the rotating frame 608 pushes the short shaft 613 The connected sliding rod 615 slides toward the outside of the mounting plate 607, thereby increasing the spacing between the clamps 616, placing the edge of the diaphragm between the clamps 616, and rotating the rotating frame 608 in the opposite direction. The rotating frame 608 drives the sliding rod 615 to push the clamps 616 to fit together, so that the rubber strip on the clamp 616 bites the edge of the diaphragm and clamps the diaphragm. The limit block 611 is released, and under the elastic force of the spring three 612, the limit block 611 is reset and the gear ring three 610 is locked. After the diaphragm is fixed in the device, it is kept The position of the puncture rod 4 remains unchanged, the hydraulic rod 513 is started, the output end of the hydraulic rod 513 is extended, and the puncture rod 4 is driven to approach the diaphragm, and the diaphragm is punctured in a direction perpendicular to the diaphragm. After the puncture, the data is recorded, and the motor 1 514 is started. The motor 1 514 drives the gear 1 515 engaged with the gear ring 2 516 to rotate, so that the movable platform 505 moves in the groove 504 using the spring 1 510, thereby changing the puncture direction of the diaphragm by the puncture rod 4. After multiple punctures with different positions, the data is recorded and the locking mechanism is pushed upward. Rod 507, so that the rack 1 508 on the locking rod 507 releases the lock of the gear ring 1 506, and the adjusting shaft 501 is rotated. The adjusting shaft 501 drives the two annular frames 503 to rotate a certain angle, so that the puncture rod 4 can form an inclined angle with the diaphragm. The locking rod 507 is released, and under the elastic force of spring 1 510, the rack 1 508 re-locks the gear ring 1 506. The adjusting shaft 501 no longer drives the annular frame 503 to rotate, and the puncture rod 4 is used to puncture the diaphragm. According to the above steps, multiple puncture tests with changing angles are carried out.

[0025] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for detecting the puncture resistance of a lithium battery diaphragm of an automobile, comprising a support (1), characterized in that: Two symmetrical mobile racks (3) are provided on the outside of the support platform (1); the same multi-dimensional force field simulation module (5) is provided on the two fixed racks (2); and a puncture rod (4) is provided on the multi-dimensional force field simulation module (5); two symmetrical mobile racks (3) are provided on the support platform (1), and each mobile rack (3) is provided with an adaptive clamping module (6); The multi-dimensional force field simulation module (5) comprises two symmetrical adjustment shafts (501), and the two fixing frames (2) are both provided with circular holes, the inner walls of the circular holes are movably connected to the outside of the adjustment shaft (501) on the same side, and the two adjustment shafts (501) are both fixedly connected to the opposite sides with a connecting piece (502); The adaptive clamping module (6) comprises two symmetrical rectangular grooves (601), and the two rectangular grooves (601) are both arranged on the upper side of the support platform (1).

2. The device for detecting the puncture resistance of the automotive lithium battery separator according to claim 1, characterized in that: Two symmetrical annular frames (503) are provided between the two connecting members (502), and both ends of the two connecting members (502) away from the fixing frame (2) are fixedly connected to the outside of the two annular frames (503), and grooves (504) are provided on opposite sides of the two annular frames (503). The outside of one of the adjusting shafts (501) is fixedly connected to a gear ring (506), and a locking rod (507) is provided on the outside of the gear ring (506).

3. The device for detecting the puncture resistance of the automotive lithium battery separator according to claim 2, characterized in that: The inner wall of the locking rod (507) is fixedly connected to a rack (508), and the rack (508) is engaged with the gear ring (506). The outer portion of the locking rod (507) is slidably connected to a guide buckle (509), and the guide buckle (509) is fixedly connected to the side opposite to the fixing frame (2). The side of the guide buckle (509) away from the adjustment shaft (501) is fixedly connected to a spring (510), and the end of the spring (510) away from the guide buckle (509) is fixedly connected to the inner wall of the locking rod (507).

4. The device for detecting the puncture resistance of the automotive lithium battery separator according to claim 2, characterized in that: The same movable platform (505) is provided in the two grooves (504), and a circular groove is provided on the movable platform (505). The inner wall of the circular groove is fixedly connected to a hydraulic rod (513), the output end of the hydraulic rod (513) is fixedly connected to a connecting frame (517), and the bottom of the connecting frame (517) is provided with an engaging groove (523), the inner wall of the engaging groove (523) is slidably connected to the outside of the puncture rod (4), the top inner wall of the connecting frame (517) is fixedly connected to a circular shaft (518), the outside of the circular shaft (518) is movably connected to a bevel block 1 (519), and the outside of the circular shaft (518) is slidably connected to a bevel block 2 (520), the bevel block 2 (520) is symmetrical to the bevel block 1 (519), the bottom of the bevel block 2 (520) is fixedly connected to a limit frame (522), and the inner wall of the limit frame (522) is plugged into the upper side of the puncture rod (4).

5. The device for detecting the puncture resistance of the automotive lithium battery separator according to claim 4, characterized in that: The connection frame (517) is provided with a rectangular opening on the outside, and a short plate is slidably connected in the rectangular opening. The short plate is fixedly connected to the side opposite to the second inclined block (520), and the upper side of the short plate is fixedly connected to the second spring (521). The end of the second spring (521) away from the short plate is fixedly connected to the outside of the connection frame (517).

6. The device for detecting the puncture resistance of the automotive lithium battery separator according to claim 4, characterized in that: The movable platform (505) is movably connected to two symmetrical rollers (511) on one side close to the annular frame (503), and the outer portions of the rollers (511) are in contact with the inner wall of the groove (504). The bottom of the movable platform (505) is fixedly connected to two symmetrical elastic springs (512), and the outer portions of the elastic springs (512) are slidably connected to the inner wall of the groove (504). A second gear ring (516) is fixedly connected to one of the annular frames (503). The bottom of the movable platform (505) is fixedly connected to a first motor (514), and an output end of the first motor (514) is connected to a first gear (515) via a coupling. The first gear (515) is meshed with the second gear ring (516).

7. The device for testing the puncture resistance of automotive lithium battery separators according to claim 1, characterized in that: The inner walls of the two rectangular grooves (601) are respectively slidably connected to the outside of the two movable frames (3). The movable frames (3) are each provided with a circular opening, and a same bidirectional screw rod (602) is arranged in the circular hole. Both ends of the bidirectional screw rod (602) are movably connected to the inner wall of the support platform (1). The outside of the bidirectional screw rod (602) is fixedly connected to a gear three (605), and the inner wall of the support platform (1) is fixedly connected to a motor two (603). The output end of the motor two (603) is connected to a gear two (604) through a coupling, and the gear two (604) is meshed with the gear three (605).

8. The device for detecting the puncture resistance of automotive lithium battery separators according to claim 7, characterized in that: The two movable frames (3) are each provided with a slot, a fixed shaft (606) is fixedly connected in the slot, a mounting plate (607) is fixedly connected to the side of the fixed shaft (606) away from the movable frame (3), and two symmetrical slots (614) are provided on the side of the mounting plate (607) away from the fixed shaft (606), a sliding rod (615) is slidably connected in the slots (614), the two sliding rods (615) on the same side are fixedly connected to the opposite side of the clamps (616), and the two clamps (616) on the same side are fixedly connected to the opposite side of the rubber strips, and the two rubber strips are staggered.

9. The device for testing the puncture resistance of automotive lithium battery separators according to claim 8, characterized in that: The plurality of slots (614) are each provided with a cutout on an inner wall of a side close to the movable frame (3), and a short shaft (613) is slidably connected in the cutout. The short shaft (613) is fixedly connected to the side opposite to the sliding rod (615), and the outside of the two fixed shafts (606) is movably connected to a rotating frame (608), and the side opposite to the mounting plate (607) on the same side is movably connected. The rotating frame (608) is provided with two circumferentially equidistantly distributed curved grooves (609), and the inner walls of the curved grooves (609) are slidably connected to the outside of the short shaft (613) on the same side.

10. The device for detecting the puncture resistance of the automotive lithium battery separator according to claim 9, characterized in that: The outsides of the two rotating frames (608) are fixedly connected to the gear ring three (610), and the two moving frames (3) are each provided with a narrow opening, and a short rod is slidably connected in the narrow opening, and the end of the short rod close to the gear ring three (610) is fixedly connected to the limit block (611), and the outside of the limit block (611) is clamped with the gear ring three (610) on the same side, and the outside of the moving frame (3) is fixedly connected to two symmetrical springs three (612), and the side of the spring three (612) away from the moving frame (3) is fixedly connected to the outside of the short rod on the same side.

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