Lithium battery diaphragm puncture resistance testing device

Abstract

The present invention discloses a device for detecting the puncture resistance of lithium battery diaphragms, which includes an equipment platform, on which a diaphragm puncture resistance detector is provided; the diaphragm puncture resistance detector includes a supporting body, which is fixedly mounted on the top of the equipment platform; a diaphragm clamp is mounted on the top of the equipment platform, and the diaphragm clamp is used to fix the diaphragm; a detection substrate is slidably connected to the side of the supporting body, and a circular base is fixedly mounted on the bottom of the detection substrate, and a retaining circular groove is provided at the center of the circular base, in which a puncture needle is placed. The detection device of the present invention can install a puncture needle without adding parts or opening a lock hole on the needle body by retaining a clamping device, thereby avoiding the phenomenon of changing the mass distribution and structural integrity of the puncture needle, resulting in the center of gravity shift during the puncture process, and can improve the puncture accuracy of the device, thereby improving the detection effect of the device.

Description

Technical Field

[0001] The present invention belongs to the technical field of puncture resistance performance detection, and specifically relates to a device for detecting the puncture resistance performance of a lithium battery separator. Background Art

[0002] Lithium battery separator is the inner component of lithium battery. 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. The separator with excellent performance plays an important role in improving the comprehensive performance of the battery. Therefore, it is necessary to test the puncture resistance of lithium battery separator to avoid the puncture resistance of the separator affecting the use of lithium battery.

[0003] When using the existing lithium battery diaphragm puncture resistance performance testing device, it is necessary to select a matching puncture needle for testing according to different performance testing requirements or according to the different uses of the lithium battery. This results in different sizes and shapes of the puncture needles replaced each time. However, the existing device cannot adapt to puncture needles of different sizes and shapes during the replacement process. The puncture needle can only be loaded and unloaded by adding parts to the needle body or opening a lock hole. However, this is likely to change the mass distribution and structural integrity of the puncture needle, making the puncture needle prone to center of gravity shift during the puncture process, reducing the puncture accuracy of the device, and thus being unable to accurately measure the puncture resistance performance of the diaphragm under the ideal puncture state, and affecting the accuracy of the test data, making the device more limited in the detection process, thereby reducing the detection effect of the device. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a lithium battery separator puncture resistance performance detection device, which effectively solves the problems in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A lithium battery diaphragm puncture resistance performance testing device comprises an equipment table; a diaphragm puncture resistance detector is provided on the equipment table; the diaphragm puncture resistance detector comprises a supporting body, which is fixedly mounted on the top of the equipment table; a diaphragm clamp is also installed on the top of the equipment table, and the diaphragm clamp is used to fix the diaphragm; the side of the supporting body is slidably connected to the detection substrate, and a circular base is fixedly mounted on the bottom of the detection substrate, and a retaining circular groove is provided at the center of the circular base, and a puncture needle is placed in the retaining circular groove, the sharp end of the puncture needle faces the diaphragm clamp, and the diaphragm clamp is located below the sharp end of the puncture needle; a retaining clamping device is also provided on the detection substrate, and the retaining clamping device is used to install and remove the puncture needle at the circular base; two relatively arranged air control racks are installed on the top of the detection substrate, and an air control resistance module is provided on the air control rack, and the air control resistance module is used to prevent the puncture needle from shaking during use.

[0007] Preferably, the retaining clamping device includes two U-shaped bases, and the two U-shaped bases are symmetrically mounted on the top of the detection substrate; the inner opposite surfaces of the U-shaped base are commonly connected to a limited motion square column, and a T-shaped cross block is slidably connected to the limited motion square column; a limited spring is sleeved on the limited motion square column, one end of the limited spring is fixedly connected to the inner wall of the U-shaped base, and the other end is fixedly connected to the T-shaped cross block; U-shaped connecting rods are respectively installed on the opposite back surfaces of the two T-shaped cross blocks, one end point of the U-shaped connecting rod is located at the bottom of the detection substrate and a retaining U seat is also installed, and the two retaining U seats are symmetrically arranged with the puncture needle as the symmetry axis.

[0008] Preferably, a retaining slide column is fixedly installed in the retaining U-seat, and a retaining slider is slidably connected to the retaining slide column. A retaining cylinder is installed on the side of the retaining slider close to the puncture needle, and a retaining cylinder is slidably connected in the retaining cylinder. A rubber arc block is installed on the retaining cylinder, and the side wall of the puncture needle is located on the moving path of the rubber arc block; a retaining spring is provided in the retaining cylinder, one end of the retaining spring is fixedly connected to the retaining cylinder, and the other end is fixedly connected to the inner bottom surface of the retaining cylinder; an auxiliary spring is sleeved on the retaining slide column, one end of the auxiliary spring is fixedly connected to the retaining slider, and the other end is fixedly connected to the inner wall of the retaining U-seat.

[0009] Preferably, the air control resistance module includes a rotating gear, which is located between the opposite surfaces of the two air control racks and is meshed; two symmetrically arranged brake square plates are installed on the side of the air control rack away from the rotating gear, and the opposite surfaces of the two brake square plates are commonly connected to a brake square column, and a brake base is slidably connected to the brake square column, and the brake base is fixedly installed on the top of the detection substrate; a brake spring is sleeved on the brake square column, one end of the brake spring is fixedly connected to the brake square plate, and the other end is fixedly connected to the brake base.

[0010] Preferably, an air-control square column is respectively installed on one of the opposite ends of the two air-control racks, and an air-control square cylinder is slidably connected to the end point of the air-control square column. An auxiliary base is fixedly installed on the air-control square cylinder, and the auxiliary base is fixedly installed on the detection substrate; a connecting hose is installed on the air-control square cylinder; the inner side wall of the retaining circular groove is also fixedly installed with the outer side wall of the rubber airbag, and the inner side wall of the rubber airbag contacts the outer side wall of the puncture needle after expansion; one end of the connecting hose is connected to the air-control square cylinder, and the other end is connected to the rubber airbag.

[0011] Preferably, a fixed distance limiting movement unit is provided on the T-shaped cross block; the fixed distance limiting movement unit includes two symmetrically arranged fixed distance sliding columns arranged on the top of the T-shaped cross block, the two fixed distance sliding columns are slidably connected to the fixed distance block, and a locking distance plug is installed at the bottom of the fixed distance block; a fixed distance spring is sleeved on the fixed distance sliding column, one end of the fixed distance spring is fixedly connected to the fixed distance block, and the other end is connected to a fixed distance limiting plate, and the fixed distance limiting plate is fixedly installed on the end of the fixed distance sliding column away from the T-shaped cross block.

[0012] Preferably, a plurality of locking slots are provided on the top of the limiting square column, and the locking insert passes through the top of the T-shaped horizontal block and is connected to one of the locking slots.

[0013] Preferably, a blocking slot is provided at the top of the rotating gear; a driving motor is also provided at the top of the detection substrate, and a blocking block is installed on the output end of the driving motor, and the blocking block is fitted and connected to the blocking slot; a rotating groove is provided at the bottom of the rotating gear, and a rotating block is rotatably connected to the rotating groove, and the rotating block is fixedly installed on the top of the detection substrate.

[0014] Preferably, a loading and unloading stop structure is provided on the T-shaped cross block; the loading and unloading stop structure includes a group of stop slides, and the number of stop slides is two; the stop slide is installed through the side of the T-shaped cross block close to the drive motor; the stop slide and the T-shaped cross block slide together; the two stop slides are installed with a stop base plate at one end close to the drive motor, and the two stop base plates are commonly connected to a stop block, and the side of the drive motor is located on the moving path of the stop block and the contact surfaces of the two are matched; a rubber pad is provided on the side of the stop block close to the drive motor; a stop spring is sleeved on the stop slide, one end of the stop spring is fixedly connected to the T-shaped cross block, and the other end is connected to a stop limit plate, and the stop limit plate is fixedly installed on the end of the stop slide away from the stop block.

[0015] Preferably, an extension base plate is mounted on the gas-making square column, a pressure column is mounted on the extension base plate, and the end point of the pressure column faces the puncture needle; the side of the retaining slider away from the puncture needle is located on the moving path of the pressure column.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The two rubber arc blocks move relative to each other to fix the puncture needle in the circular base, thereby completing the installation operation of the puncture needle. The rubber arc block also has a certain elasticity and toughness, so that no matter what the shape of the puncture needle is, the contact surface of the rubber arc block and the puncture needle can be completely fitted, thereby improving the clamping effect of the rubber arc block on the puncture needle. The friction between the two when in contact is sufficient to avoid the puncture needle from being dislocated during use or the position of the puncture needle changing due to excessive pressure applied by the puncture needle to the diaphragm, so that the device can be used according to different performance testing requirements or according to the use of the lithium battery. When selecting a matching puncture needle, there is no need to replace the matching fixture according to the shape and size of the puncture needle to be used. At the same time, when installing the puncture needle, there is no need to add parts to the needle body or open a lock hole to complete the loading and unloading operation of the puncture needle, which avoids changing the mass distribution and structural integrity of the puncture needle, resulting in the center of gravity shift during the puncture process, and improves the puncture accuracy of the device, so that the puncture resistance of the diaphragm under the ideal puncture state can be accurately measured, avoiding the impact on the test data, reducing the limitations of the device during detection, and thus improving the detection effect of the device;

[0018] (2) The air-controlling square column drives the pressure column to move toward the puncture needle under the action of the extended base plate, so that the pressure column contacts the retaining slider, so that the retaining slider slides at the retaining slider, so that the auxiliary spring is in a buffering state, and then the retaining cylinder on the retaining slider moves at the retaining cylinder, further making the retaining spring in a buffering state, thereby continuously strengthening the contact strength between the rubber arc block and the puncture needle, avoiding the displacement or dislocation of the puncture needle during use, improving the stability of the puncture needle during use, and improving the detection effect of the device; at the same time, after the pressure column contacts the retaining slider, the rubber arc block is limited, avoiding the dislocation of the rubber arc block when connected to the puncture needle, and improving the installation effect of the device on the puncture needle;

[0019] (3) The two gas-making square columns move relative to each other, so that they move within the gas-making square tube in a limited manner, and the gas inside is transported to the rubber airbag under the action of the connecting hose, so that the rubber airbag expands, and the inner wall of the expanded rubber airbag contacts the part of the puncture needle in the retaining circular groove, thereby strengthening the clamping effect of the puncture needle and limiting the puncture needle, preventing the root of the puncture needle from shaking during use. At the same time, the inner wall of the rubber airbag fits and wraps with the outer wall of the puncture needle after expansion, preventing the puncture needle from being dislocated or shaking during the detection process, thereby improving the detection effect of the puncture needle on the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] In the attached figure:

[0022] Figure 1 Schematic diagram of the overall structure of the lithium battery separator puncture resistance performance testing device of the present invention;

[0023] Figure 2 It is a cross-sectional exploded view of the rotating gear in the present invention;

[0024] Figure 3 This is a structural diagram of the stop position block of the present invention;

[0025] Figure 4 Schematic diagram of the structure of the blocking slot in the present invention;

[0026] Figure 5 It is a schematic structural diagram of the T-shaped horizontal block in the present invention;

[0027] Figure 6 Schematic diagram of the structure of the retaining slider in the present invention;

[0028] Figure 7 This is a schematic structural diagram of the locking distance plug in the present invention;

[0029] Figure 8 Schematic diagram of the structure of the driving motor in the present invention;

[0030] Figure 9 is a cross-sectional view of the retaining cylinder in the present invention;

[0031] Figure 10 This is an internal diagram of the rubber airbag of the present invention;

[0032] Figure 11 It is a cross-sectional exploded view of the distance block in the present invention;

[0033] Figure 12 It is a structural schematic diagram of the pressure column in the present invention;

[0034] Figure 13 1 is a cross-sectional exploded view of the retaining circular groove of the present invention;

[0035] In the figure: 1. Equipment table; 2. Support body; 3. Diaphragm fixture; 4. Detection substrate; 5. Circular base; 6. Retention groove; 7. Puncture needle; 8. Air rack; 9. U-shaped base; 10. Limiting square column; 11. T-shaped cross block; 12. Limiting spring; 13. U-shaped connecting rod; 14. Retention U seat; 15. Retention slide column; 16. Retention slider; 17. Retention cylinder; 18. Retention cylinder; 19. Rubber arc block; 20. Retention spring; 21. Auxiliary spring; 22. Rotating gear; 23. Braking square plate; 24. Braking square column; 25. Braking base ; 26. Brake spring; 27. Gas control square column; 28. Gas control square cylinder; 29. Auxiliary base; 30. Connecting hose; 31. Rubber airbag; 32. Fixed distance slide column; 33. Fixed distance block; 34. Lock distance plug-in block; 35. Fixed distance spring; 36. Fixed distance limit plate; 37. Lock distance slot; 38. Stop slot; 39. Drive motor; 40. Stop block; 41. Rotary slot; 42. Rotary block; 43. Stop slide column; 44. Stop base plate; 45. Stop block; 46. Rubber pad; 47. Stop spring; 48. Extension base plate; 49. Pressure column. DETAILED DESCRIPTION

[0036] 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; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] like Figures 1 to 13 As shown, the lithium battery diaphragm puncture resistance performance testing device of the present invention includes an equipment platform 1, on which a diaphragm puncture resistance detector is provided;

[0038] The diaphragm anti-puncture detector includes a support body 2, which is fixedly mounted on the top of the equipment platform 1; a diaphragm clamp 3 is also installed on the top of the equipment platform 1, and the diaphragm clamp 3 is used to fix the diaphragm; a detection substrate 4 is slidably connected to the side of the support body 2, and a circular base 5 is fixedly mounted on the bottom of the detection substrate 4. A retaining circular groove 6 is provided at the center of the circular base 5, and a puncture needle 7 is placed in the retaining circular groove 6. The sharp end of the puncture needle 7 faces the diaphragm clamp 3, and the diaphragm clamp 3 is located below the sharp end of the puncture needle 7;

[0039] A retaining and clamping device is also provided on the detection substrate 4, which is used to install and remove the puncture needle 7 at the circular base 5; two relatively arranged air-control racks 8 are installed on the top of the detection substrate 4, and an air-control resistance module is provided on the air-control rack 8, which is used to prevent the puncture needle 7 from shaking during use.

[0040] The operator fixes the diaphragm that needs to be tested for puncture resistance on the diaphragm clamp 3, and sets the driving source at the detection substrate 4 to make it slide on the supporting body 2, thereby driving the puncture needle 7 on the detection substrate 4 to move toward the diaphragm clamp 3 and contact the diaphragm fixed thereon, so that the puncture resistance of the diaphragm can be tested, thereby avoiding the puncture resistance of the diaphragm from affecting the normal use of the lithium battery.

[0041] In some embodiments, the above-mentioned retaining clamping device includes two U-shaped bases 9, and the two U-shaped bases 9 are symmetrically installed on the top of the detection substrate 4; the inner opposite surfaces of the U-shaped base 9 are commonly connected to a limited motion square column 10, and a T-shaped cross block 11 is slidably connected to the limited motion square column 10; a limiting spring 12 is sleeved on the limiting square column 10, one end of the limiting spring 12 is fixedly connected to the inner wall of the U-shaped base 9, and the other end is fixedly connected to the T-shaped cross block 11; U-shaped connecting rods 13 are respectively installed on the opposite back surfaces of the two T-shaped cross blocks 11, one end of the U-shaped connecting rod 13 is located at the bottom of the detection substrate 4 and is also installed with a retaining U seat 14, and the two retaining U seats 14 are symmetrically arranged with the puncture needle 7 as the symmetry axis; the retaining U seat 14 A retaining slide 15 is fixedly installed inside, and a retaining slider 16 is slidably connected to the retaining slide 15. A retaining cylinder 17 is installed on the side of the retaining slider 16 close to the puncture needle 7. A retaining cylinder 18 is slidably connected inside the retaining cylinder 17, and a rubber arc block 19 is installed on the retaining cylinder 18. The side wall of the puncture needle 7 is located on the moving path of the rubber arc block 19; a retaining spring 20 is provided in the retaining cylinder 17, one end of the retaining spring 20 is fixedly connected to the retaining cylinder 18, and the other end is fixedly connected to the inner bottom surface of the retaining cylinder 17; an auxiliary spring 21 is sleeved on the retaining slide 15, one end of the auxiliary spring 21 is fixedly connected to the retaining slide 16, and the other end is fixedly connected to the inner wall of the retaining U seat 14.

[0042] When the puncture needle 7 needs to be installed to test the puncture resistance of the diaphragm, the two T-shaped cross blocks 11 are pulled outward, so that the two T-shaped cross blocks 11 move back to back, and then move to the upper limit of the limit square column 10, so that the limit spring 12 is in a buffering state, and then the T-shaped cross block 11 drives the retaining U seat 14 to move under the action of the U-shaped connecting rod 13, so that the retaining slider 16 on it is away from the circular base 5, and the retaining slider 16 drives the rubber arc under the action of the retaining cylinder 17, the retaining cylinder 18 and the retaining spring 20. The block 19 is away from the circular base 5. At this time, the puncture needle 7 to be installed is placed in the retaining groove 6 in the circular base 5. By loosening the T-shaped cross block 11, the limit spring 12 is no longer under force. The reset of the limit spring 12 drives the T-shaped cross block 11 to reset and move, so that the rubber arc block 19 on it moves toward the direction of the puncture needle 7 and contacts it, so that the two rubber arc blocks 19 move relative to each other to fix the puncture needle 7 in the circular base 5, thereby completing the installation operation of the puncture needle 7. The rubber arc block 19 also has a certain elasticity. The rubber arc block 19 has good properties and toughness, so that no matter what the shape of the puncture needle 7 is, the contact surface of the rubber arc block 19 and the puncture needle 7 can be completely fitted, thereby improving the clamping effect of the rubber arc block 19 on the puncture needle 7, and the friction between the two when in contact is sufficient, thereby preventing the puncture needle 7 from being dislocated during use or the position of the puncture needle 7 from changing due to excessive pressure exerted by the puncture needle 7 on the diaphragm. When the device selects a matching puncture needle 7 according to different performance testing requirements or according to different uses of the lithium battery, there is no need for the device to replace the matching clamp according to the shape and size of the puncture needle 7 to be used. At the same time, when installing the puncture needle 7, there is no need to add parts to the needle body or open a lock hole to complete the loading and unloading operation of the puncture needle 7, thereby avoiding changing the mass distribution and structural integrity of the puncture needle 7, resulting in the center of gravity shifting during the puncture process, and improving the puncture accuracy of the device, thereby accurately measuring the puncture resistance of the diaphragm under the ideal puncture state, avoiding affecting the test data, and thus improving the detection effect of the device.

[0043] It should be noted that, since the strength of the limit spring 12 is greater than the retaining spring 20, when the two rubber arc blocks 19 move relative to each other to fix the puncture needle 7, it means that the rubber arc block 19 cannot move further, so that the continued resetting of the limit spring 12 can drive the retaining slider 16 to continue to move, so that the retaining cylinder 17 on it is limited and moved at the retaining cylinder 18, so that the retaining spring 20 is in a buffering state, thereby strengthening the contact strength between the rubber arc block 19 and the puncture needle 7, and improving the installation effect of the puncture needle 7; when strengthening the contact strength between the rubber arc block 19 and the puncture needle 7, the rubber arc block 19 can fit the outer wall of the puncture needle 7 more perfectly, avoiding the defective fit between the two, which causes the puncture needle 7 to easily shake or dislocate during use, and further improving the clamping effect of the puncture needle 7.

[0044] In some other embodiments, the air resistance module includes a rotating gear 22, which is located between the opposite surfaces of the two air racks 8 and is meshed; two symmetrically arranged brake square plates 23 are installed on the side of the air rack 8 away from the rotating gear 22, and the opposite surfaces of the two brake square plates 23 are commonly connected to a brake square column 24, and a brake base 25 is slidably connected to the brake square column 24, and the brake base 25 is fixedly installed on the top of the detection substrate 4; a brake spring 26 is sleeved on the brake square column 24, one end of the brake spring 26 is fixedly connected to the brake square plate 23, and the other end is fixedly connected to the brake base 25; an air square column 27 is respectively installed on one of the opposite ends of the two air racks 8, and an air square cylinder 28 is slidably connected at the end point of the air square column 27, and an auxiliary base 29 is fixedly installed on the air square cylinder 28, and the auxiliary base 29 is fixedly installed on the detection substrate 4, and a connecting hose 30 is installed on the air square cylinder 28;

[0045] The inner wall of the retaining circular groove 6 is also fixedly mounted with the outer wall of the rubber airbag 31, and the inner wall of the rubber airbag 31 contacts the outer wall of the puncture needle 7 after expansion; one end of the connecting hose 30 is connected to the air-making square cylinder 28, and the other end is connected to the rubber airbag 31; the top of the rotating gear 22 is provided with a blocking groove 38, and the top of the detection substrate 4 is also provided with a driving motor 39, and the output end of the driving motor 39 is provided with a blocking block 40, which is fitted and connected to the blocking groove 38; the bottom of the rotating gear 22 is provided with a rotating groove 41, and a rotating block 42 is rotatably connected to the rotating groove 41, and the rotating block 42 is fixedly mounted on the top of the detection substrate 4.

[0046] By starting the driving motor 39, the blocking block 40 on its output end drives the rotating gear 22 to rotate under the action of the blocking slot 38, so that the two gas-making racks 8 are engaged and move relative to each other, so that they are limited and moved on the brake base 25 through the braking square column 24, so that the braking spring 26 is in a buffering state, so that it can drive the rotating gear 22 to reset and rotate to wait for the next replacement operation of the puncture needle 7; so that the two gas-making square columns 27 can move relative to each other, so that they can limit and move in the gas-making square cylinder 28, so that the gas inside can be continuously moved. Under the action of the flexible tube 30, it is transported into the rubber airbag 31, causing the rubber airbag 31 to expand, so that the inner wall of the expanded airbag contacts the part of the puncture needle 7 in the retaining circular groove 6, thereby strengthening the clamping effect of the puncture needle 7 and limiting the puncture needle 7 to prevent the root of the puncture needle 7 from shaking during use. At the same time, the inner wall of the rubber airbag 31 fits and wraps the outer wall of the puncture needle 7 after expansion, preventing the puncture needle 7 from being dislocated or shaking during the detection process, thereby improving the detection effect of the puncture needle 7 on the diaphragm.

[0047] It should also be noted that, in some embodiments, a fixed distance limiting movement unit can also be provided on the T-shaped cross block 11; the fixed distance limiting movement unit includes two symmetrically arranged fixed distance sliding columns 32 arranged on the top of the T-shaped cross block 11, and the two fixed distance sliding columns 32 are slidably connected to the fixed distance block 33, and the bottom of the fixed distance block 33 is installed with a locking distance plug 34; a fixed distance spring 35 is sleeved on the fixed distance sliding column 32, one end of the fixed distance spring 35 is fixedly connected to the fixed distance block 33, and the other end is connected to a fixed distance limiting plate 36, and the fixed distance limiting plate 36 is fixedly installed on the end of the fixed distance sliding column 32 away from the T-shaped cross block 11; a plurality of locking distance slots 37 are provided on the top of the limiting square column 10, and the locking distance plug 34 passes through the top of the T-shaped cross block 11 and is connected to one of the locking distance slots 37.

[0048] When the device is required to install the puncture needle 7 in the circular base 5, the distance block 33 is pulled upward to limit the movement at the distance slide column 32, so that the distance spring 35 is in a buffering state, and then the locking distance plug 34 on the distance block 33 is disengaged from the T-shaped cross block 11 and is no longer connected to the locking distance slot 37, thereby releasing the limit setting of the T-shaped cross block 11, allowing the rubber arc block 19 to move, so that it is out of the moving path of the puncture needle 7, avoiding affecting the installation of the puncture needle 7.

[0049] It is worth mentioning that if the puncture needle 7 needs to be disassembled after installation, the above operation can cause the two rubber arc blocks 19 to move away from each other, thereby releasing the clamping operation of the puncture needle 7; when the operator completes the installation operation of the puncture needle 7, by loosening the distance block 33, the distance spring 35 is reset to drive the distance block 33 to reset and move, so that the locking distance plug 34 on it passes through the T-shaped cross block 11 and is connected to the locking distance slot 37, thereby limiting the T-shaped cross block 11 to the current position, avoiding the rubber arc block 19 from being dislocated during the installation process of the puncture needle 7, and improving the installation effect of the device on the puncture needle 7.

[0050] In addition, the number of locking slots 37 is set to be several, so that the rubber arc block 19 can be connected to the puncture needle 7 at different positions, that is, puncture needles 7 of different sizes can be installed, reducing the limitations of the device during use and improving the detection effect of the device.

[0051] In some other embodiments, a loading and unloading stop structure may be further provided on the T-shaped cross block 11 .

[0052] The loading and unloading stop structure includes a group of stop slides 43, and the number of stop slides 43 is two; the stop slide 43 is installed through the side of the T-shaped cross block 11 close to the drive motor 39; the stop slide 43 and the T-shaped cross block 11 slide together; the two stop slides 43 are installed with a stop base plate 44 on the end close to the drive motor 39, and the two stop base plates 44 are commonly connected to a stop block 45, and the side of the drive motor 39 is located on the moving path of the stop block 45 and the contact surfaces of the two are matched; a rubber pad 46 is provided on the side of the stop block 45 close to the drive motor 39; a stop spring 47 is sleeved on the stop slide 43, one end of the stop spring 47 is fixedly connected to the T-shaped cross block 11, and the other end is connected to a stop limit plate, and the stop limit plate is fixedly installed on the end of the stop slide 43 away from the stop block 45.

[0053] When the device removes the puncture needle 7 from the circular base 5, the T-shaped cross block 11 moves away from the puncture needle 7, so that the T-shaped cross block 11 drives the stop block 45 away from the drive motor 39 under the action of the stop slide 43 and the stop spring 47, thereby simultaneously releasing the limit setting of the drive motor 39, and completing the removal operation of the drive motor 39;

[0054] When installing the puncture needle 7, the reset of the T-shaped cross block 11 drives the stop block 45 to move toward the direction of the drive motor 39 and makes the two contact, thereby clamping the drive motor 39 in the current position, thereby completing the installation operation of the drive motor 39, making the device convenient and quick to load and unload the drive motor 39 and the puncture needle 7, and the drive motor 39 and the puncture needle 7 can be loaded and unloaded without the aid of any tools, which facilitates the replacement or maintenance of the drive motor 39 and the puncture needle 7 during the detection process, so that the gas control and resistance module can use drive motors 39 of different types or powers as needed.

[0055] It is worth mentioning that since the strength of the limit spring 12 is greater than that of the stop spring 47, after the stop block 45 contacts the drive motor 39, the stop spring 47 continues to reset, causing the T-shaped cross block 11 to move in a limited position at the stop slide 43, thereby strengthening the contact strength of the stop block 45 on the drive motor 39, and the friction force between the stop block 45 and the drive motor 39 is also increased through the rubber pad 46, thereby avoiding dislocation or shaking of the drive motor 39 during use, thereby improving the use effect of the drive motor 39.

[0056] In this embodiment, an extended substrate 48 is installed on the gas-making square column 27, and a pressure column 49 is installed on the extended substrate 48. The end point of the pressure column 49 faces the puncture needle 7; the side of the retaining slider 16 away from the puncture needle 7 is located on the moving path of the pressure column 49.

[0057] When the gas-control square column 27 moves toward the circular base 5, it will also drive the pressure-applying column 49 to move toward the puncture needle 7 under the action of the extended base plate 48, so that the pressure-applying column 49 contacts the retaining slider 16, so that the retaining slider 16 slides at the retaining slider 15, so that the auxiliary spring 21 is in a buffering state, and then the retaining cylinder 17 on the retaining slider 16 moves at the retaining cylinder 18, further making the retaining spring 20 in a buffering state, thereby continuously strengthening the contact strength between the rubber arc block 19 and the puncture needle 7, avoiding the displacement or dislocation of the puncture needle 7 during use, improving the stability of the puncture needle 7 during use, and improving the detection effect of the device; at the same time, after the pressure-applying column 49 contacts the retaining slider 16, the rubber arc block 19 is limited, avoiding the dislocation of the rubber arc block 19 when connected to the puncture needle 7, and improving the installation effect of the device on the puncture needle 7.

[0058] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery diaphragm puncture resistance testing device, comprising a device platform (1); characterized in that: The device platform (1) is provided with a diaphragm anti-puncture detector; the diaphragm anti-puncture detector comprises a supporting body (2), the supporting body (2) is fixedly mounted on the top of the device platform (1); a diaphragm clamp (3) is also mounted on the top of the device platform (1), the diaphragm clamp (3) is used to fix the diaphragm; a detection substrate (4) is slidably connected to the side of the supporting body (2), a circular base (5) is fixedly mounted on the bottom of the detection substrate (4), a retaining groove (6) is provided at the center of the circular base (5), and a retaining groove (6) is placed in the retaining groove (6) There is a puncture needle (7), the sharp end of the puncture needle (7) faces the diaphragm clamp (3), and the diaphragm clamp (3) is located below the sharp end of the puncture needle (7); the detection substrate (4) is also provided with a retaining clamping device, and the retaining clamping device is used to install and remove the puncture needle (7) at the circular base (5); the top of the detection substrate (4) is provided with two air control racks (8) arranged opposite to each other, and the air control racks (8) are provided with an air control resistance module, and the air control resistance module is used to prevent the puncture needle (7) from shaking when in use; The air control resistance module comprises a rotating gear (22), the rotating gear (22) is located between the opposite surfaces of the two air control racks (8) and is meshed; two symmetrically arranged braking square plates (23) are installed on the side of the air control rack (8) away from the rotating gear (22), the opposite surfaces of the two braking square plates (23) are commonly connected to a braking square column (24), a braking base (25) is slidably connected to the braking square column (24), and the braking base (25) is fixedly installed on the top of the detection substrate (4); a braking spring (26) is sleeved on the braking square column (24), one end of the braking spring (26) is fixedly connected to the braking square plate (23), and the other end is fixedly connected to the braking base (25); A gas-controlling square column (27) is respectively installed on one of the opposite ends of the two gas-controlling racks (8), and a gas-controlling square cylinder (28) is slidably connected to the end point of the gas-controlling square column (27), and an auxiliary base (29) is fixedly installed on the gas-controlling square cylinder (28), and the auxiliary base (29) is fixedly installed on the detection substrate (4); a connecting hose (30) is installed on the gas-controlling square cylinder (28); the inner side wall of the retaining circular groove (6) is also fixedly installed with the outer side wall of the rubber airbag (31), and the inner side wall of the rubber airbag (31) contacts the outer side wall of the puncture needle (7) after expansion; one end of the connecting hose (30) is connected to the gas-control square cylinder (28), and the other end is connected to the rubber airbag (31); The top of the rotating gear (22) is provided with a blocking slot (38); the top of the detection substrate (4) is also provided with a driving motor (39), the output end of the driving motor (39) is provided with a blocking block (40), and the blocking block (40) is engaged with the blocking slot (38); the bottom of the rotating gear (22) is provided with a rotating groove (41), the rotating groove (41) is rotatably connected with a rotating block (42), and the rotating block (42) is fixedly installed on the top of the detection substrate (4).

2. The lithium battery separator puncture resistance testing device according to claim 1, characterized in that: The retaining clamping device comprises two U-shaped bases (9), and the two U-shaped bases (9) are symmetrically mounted on the top of the detection substrate (4); the inner opposite surfaces of the U-shaped base (9) are commonly connected to a limited motion square column (10), and a T-shaped cross block (11) is slidably connected to the limited motion square column (10); a limited motion spring (12) is sleeved on the limited motion square column (10), one end of the limited motion spring (12) is fixedly connected to the inner wall of the U-shaped base (9), and the other end is fixedly connected to the T-shaped cross block (11); U-shaped connecting rods (13) are respectively mounted on the opposite back surfaces of the two T-shaped cross blocks (11), one end of the U-shaped connecting rod (13) is located at the bottom of the detection substrate (4) and is also mounted with a retaining U seat (14), and the two retaining U seats (14) are symmetrically arranged with the puncture needle (7) as the symmetry axis.

3. The lithium battery separator puncture resistance testing device according to claim 2, characterized in that: A retaining slide post (15) is fixedly installed in the retaining U seat (14), a retaining slider (16) is slidably connected to the retaining slide post (15), a retaining cylinder (17) is installed on the side of the retaining slider (16) close to the puncture needle (7), a retaining cylinder (18) is slidably connected in the retaining cylinder (17), a rubber arc block (19) is installed on the retaining cylinder (18), and the side wall of the puncture needle (7) is located on the rubber arc block (19). ) on the moving path; a retaining spring (20) is provided in the retaining cylinder (17), one end of the retaining spring (20) is fixedly connected to the retaining cylinder (18), and the other end is fixedly connected to the inner bottom surface of the retaining cylinder (17); an auxiliary spring (21) is sleeved on the retaining slide column (15), one end of the auxiliary spring (21) is fixedly connected to the retaining slider (16), and the other end is fixedly connected to the inner wall of the retaining U seat (14).

4. The lithium battery separator puncture resistance testing device according to claim 2, characterized in that: The T-shaped cross block (11) is provided with a fixed distance limiting unit; the fixed distance limiting unit comprises two symmetrically arranged fixed distance sliding posts (32) arranged on the top of the T-shaped cross block (11); the two fixed distance sliding posts (32) are slidably connected to a fixed distance block (33); a locking distance plug (34) is installed at the bottom of the fixed distance block (33); a fixed distance spring (35) is sleeved on the fixed distance sliding post (32); one end of the fixed distance spring (35) is fixedly connected to the fixed distance block (33), and the other end is connected to a fixed distance limiting plate (36); the fixed distance limiting plate (36) is fixedly installed on one end of the fixed distance sliding post (32) away from the T-shaped cross block (11).

5. The lithium battery separator puncture resistance testing device according to claim 4, characterized in that: The top of the limiting square column (10) is provided with a plurality of locking slots (37) which are arranged through the locking slots (37). The locking insert (34) passes through the top of the T-shaped horizontal block (11) and is connected to one of the locking slots (37).

6. The lithium battery separator puncture resistance testing device according to claim 2, characterized in that: The T-shaped cross block (11) is provided with a loading and unloading stop structure; the loading and unloading stop structure includes a set of stop slides (43), the number of the stop slides (43) is two; the stop slides (43) are installed through the side of the T-shaped cross block (11) close to the drive motor (39); the stop slides (43) and the T-shaped cross block (11) are slidably matched; the ends of the two stop slides (43) close to the drive motor (39) are both installed with a stop base plate (44), and the two stop base plates (44) are connected together. A stop block (45) is connected, and the side surface of the driving motor (39) is located on the moving path of the stop block (45) and the contact surfaces of the two are matched; a rubber pad (46) is provided on the side of the stop block (45) close to the driving motor (39); a stop spring (47) is sleeved on the stop slide (43), one end of the stop spring (47) is fixedly connected to the T-shaped cross block (11), and the other end is connected to a stop limit plate, and the stop limit plate is fixedly installed on the end of the stop slide (43) away from the stop block (45).

7. The lithium battery separator puncture resistance testing device according to claim 1, characterized in that: An extended base plate (48) is installed on the gas-making square column (27), and a pressure column (49) is installed on the extended base plate (48), with the end point of the pressure column (49) facing the puncture needle (7); the side of the retaining slider (16) away from the puncture needle (7) is located on the moving path of the pressure column (49).

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