Diaphragm multi-point thermal puncture testing device

Abstract

The utility model relates to the technical field of lithium battery coating diaphragms, and particularly discloses a diaphragm multi-point thermal puncture testing device which comprises a base arranged on an external bearing surface, a working table used for bearing a diaphragm, a puncture assembly arranged above the working table and a driving device used for driving the working table to be close to the puncture assembly, the working table is provided with an avoiding concave hole, the membrane borne by the working table covers the avoiding concave hole, the puncture assembly is provided with a heating puncture tool bit, and the heating puncture tool bit is used for puncturing the membrane borne by the working table so as to stretch into the avoiding concave hole. The driving device comprises a first driving assembly, a second driving assembly and a third driving assembly; the first driving assembly drives the second driving assembly to reciprocate, the second driving assembly drives the workbench to reciprocate, and the third driving assembly drives the puncture assembly to reciprocate, so that position movement of the puncture assembly and the workbench is realized, the efficiency of multiple hot puncture tests performed by technicians is conveniently improved, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery coating diaphragms, in particular to a diaphragm multi-point thermal puncture test device. Background Art

[0002] Lithium battery separators are a critical component of lithium-ion batteries and other liquid electrolyte batteries, and their performance directly impacts battery safety and performance. Separators must be robust enough to withstand winding during assembly and uneven lithium plating on the anode resulting from extensive use. Safer, stronger separator materials can more effectively prevent contact between the anode and cathode, while thinner materials can help reduce the weight of each battery cell and increase energy density. Puncture tests, including thermal puncture tests, are an important means of evaluating separator performance. Thermal puncture tests simulate the separator's ability to resist puncture under extreme conditions, such as internal battery short circuits or overheating. This test not only verifies the separator's physical strength but also assesses its thermal stability and safety in high-temperature environments. This test ensures that the separator effectively prevents direct contact between the positive and negative electrodes even under high-temperature conditions, thereby preventing internal battery short circuits and improving overall battery safety.

[0003] Existing thermal penetration testers for lithium battery separators perform penetration tests at a fixed position. Each test requires repositioning the separator before the next test, a cumbersome process. There is an urgent need for a thermal penetration tester that allows for convenient separator adjustment. Utility Model Content

[0004] To overcome the shortcomings and deficiencies of the prior art, the present invention provides a multi-point thermal penetration test device for diaphragms. This device incorporates multiple position adjustment components for lateral, longitudinal, and vertical drive assemblies, enabling multi-directional position adjustment and significantly increasing testing efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides a multi-point thermal puncture test device for a diaphragm, comprising a base placed on an external supporting surface, a workbench for supporting the diaphragm, a puncture assembly placed above the workbench, and a driving device for driving the workbench close to the puncture assembly; the workbench has an avoidance recess, the diaphragm supported by the workbench covers the avoidance recess, the puncture assembly has a heating puncture blade head, the heating puncture blade head is used to puncture the diaphragm supported by the workbench to extend into the avoidance recess.

[0006] Furthermore, the drive device includes a first drive assembly mounted on the base, and a second drive assembly mounted on the first drive assembly and connected to the workbench. The first drive assembly drives the second drive assembly to reciprocate, and the second drive assembly drives the workbench to reciprocate, with the second drive assembly moving in a direction that intersects the direction of movement of the workbench. The drive assembly includes a rotatable gear and a reciprocating rack meshing with the gear. By providing the first and second drive assemblies, the workbench can be moved in multiple directions, making it easier for the user to control the position of septal puncture.

[0007] Furthermore, the drive device includes a third drive assembly mounted on the base and connected to the puncture assembly. The third drive assembly drives the puncture assembly to reciprocate, and the movement direction of the second drive assembly intersects the movement direction of the puncture assembly. By providing the third drive assembly, the puncture assembly can move in multiple directions, making it easier for the user to control the position of the puncture assembly.

[0008] Furthermore, the driving assembly includes a slide rail and a slider matched with the slide rail. The rack is arranged on the slide rail. The slider is provided with an avoidance slot, and the avoidance slot accommodates the gear.

[0009] Furthermore, the drive assembly further includes a knob, which protrudes from the slider and is rotatably connected to the slider, and a gear is fixedly disposed at one end of the knob. By disposing the knob, the gear is driven by the knob, thereby achieving relative movement between the gear and the rack, making it easier for the user to control the movement of the slider.

[0010] Furthermore, the drive assembly is further provided with a bolt fixing mechanism, which is rotatably connected to the slider and contacts the slide rail, and is used to limit the relative movement of the slider and the slide rail. Providing the bolt fixing mechanism is beneficial to limiting the relative movement of the slider and the slide rail.

[0011] Furthermore, the puncture assembly also includes a clamp, which is used to clamp and fix the heating puncture blade.

[0012] Furthermore, the clamp is provided with an adjustable clamping notch, which runs through the clamp and accommodates the heating puncture blade head. The clamping notch is provided to facilitate the installation and removal of the heating puncture blade head.

[0013] Furthermore, the workbench is provided with a puncture table with a cylindrical structure for supporting the diaphragm. An avoidance recess is provided on the puncture table to form a through hole passing through the puncture table. The through hole accommodates a heating puncture blade head, which is beneficial for the puncture table to avoid the heating puncture blade head during the lifting process of the workbench.

[0014] Furthermore, the heating puncture blade head is an electric soldering iron.

[0015] The utility model provides a multi-point diaphragm thermal puncture test device. By providing a first drive assembly, a second drive assembly, and a third drive assembly, the puncture assembly and the workbench can be moved, thereby improving the efficiency of the technician in performing multiple thermal puncture tests and being highly practical. A through hole is provided to protect the heating puncture blade from air, allowing the heating puncture blade to penetrate the diaphragm, preventing interference with the puncture table and ensuring data accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0017] Figure 2 It is a three-dimensional schematic diagram of the utility model;

[0018] Figure 3 It is a front cross-sectional schematic diagram of the utility model;

[0019] Figure 4 For this utility model Figure 3 Schematic diagram of the structure at A.

[0020] Reference numerals include:

[0021] 1. Base; 2. Workbench; 3. Puncture assembly; 4. Drive device; 201. Puncture table; 202. Avoidance recess; 301. Heating puncture blade; 302. Clamp; 401. First drive assembly; 402. Second drive assembly; 403. Third drive assembly; 405. Gear; 406. Rack; 407. Slide rail; 408. Slider; 409. Avoidance notch; 410. Knob; 411. Bolt fixing mechanism. DETAILED DESCRIPTION

[0022] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0023] See also Figures 1 to 4 As shown, the diaphragm multi-point thermal puncture test device of the present invention includes a base 1 placed on an external supporting surface, a workbench 2 for supporting the diaphragm, a puncture assembly 3 placed above the workbench 2, and a driving device 4 for driving the workbench 2 to approach the puncture assembly 3; the workbench 2 has an avoidance recess 202, the diaphragm supported by the workbench 2 covers the avoidance recess 202, the puncture assembly 3 has a heating puncture blade head 301, the heating puncture blade head 301 is used to puncture the diaphragm supported by the workbench 2 to extend into the avoidance recess 202.

[0024] Specifically, the drive device 4 includes a first drive assembly 401 mounted on the base 1 and a second drive assembly 402 mounted on the first drive assembly 401 and connected to the worktable 2. The first drive assembly 401 drives the second drive assembly 402 to reciprocate, and the second drive assembly 402 drives the worktable 2 to reciprocate, with the second drive assembly 402 moving in a direction that intersects the direction of movement of the worktable 2. The drive assembly includes a rotatable gear 405 and a reciprocating rack 406 that meshes with the gear 405. In this embodiment, the first drive assembly 401 drives the second drive assembly 402 in a lateral direction, while the second drive assembly 402 drives the worktable 2 in a vertical direction. During actual use, the user controls the first drive assembly 401 to drive the second drive assembly 402 to move. When the workbench 2 is directly below the puncture assembly 3, the lateral movement of the second drive assembly 402 is stopped. At the same time, the user controls the second drive assembly 402 to drive the workbench 2 to lift. When the heated puncture head 301 passes through the diaphragm, the vertical movement of the workbench 2 is stopped. After it remains stationary for 1 second, the control is withdrawn and the workbench 2 is lowered.

[0025] Specifically, the driving device 4 also includes a third driving assembly 403 arranged on the base 1 and connected to the puncture assembly 3. The third driving assembly 403 drives the puncture assembly 3 to reciprocate, and the moving direction of the second driving assembly 402 intersects with the moving direction of the puncture assembly 3. In this embodiment, the third driving assembly 403 drives the puncture assembly 3 to move longitudinally. During actual use, the user controls the third driving assembly 403 to drive the puncture assembly 3 to move, and the center position of the heating puncture head 301 is longitudinally offset from the center position of the workbench 2. In this embodiment, a travel scale is provided on the upper surface of the slide rail 407, and the travel range is -100mm-100mm. The initial position of the slider 408 corresponds to the 0 scale position, which is located at the center position of the slide rail 407. The longitudinal movement of the slider 408 reveals the corresponding scale.

[0026] Specifically, the drive assembly includes a slide rail 407, a slider 408 matching the slide rail 407, a rack 406 disposed on the slide rail 407, and the slider 408 having an escape notch 409 for accommodating the gear 405. In this embodiment, the first drive assembly 401, the second drive assembly 402, and the third drive assembly 403 are all provided with slide rails 407, sliders 408, and escape notches 409 of the same structure. The slider 408 provided in the first drive assembly 401 is the first slider 408, and the slide rail 407 provided is the first slide rail 407; similarly, the second drive assembly 402 is provided with a second slider 408 and a second slide rail 407; the first slider 408 is fixedly disposed on the base 1, the second slide rail 407 is fixedly disposed on the first slider 408, and the second slider 408 is fixedly connected to the workbench 2.

[0027] Specifically, the drive assembly further includes a knob 410, which protrudes from the slider 408 and is rotatably connected to the slider 408. The gear 405 is fixedly disposed at one end of the knob 410. In actual use, the user rotates the knob 410 to control the rotation of the gear 405, thereby driving the slider 408 and the slide rail 407 to move relative to each other.

[0028] Specifically, the drive assembly further includes a bolt fixing mechanism 411, which is rotatably connected to the slider 408 and abuts against the slide rail 407. Bolt fixing mechanism 411 is used to limit the relative movement of the slider 408 and the slide rail 407. In this embodiment, bolt fixing mechanism 411 is a rotational engagement structure between a screw and a screw hole. In actual use, the user rotates the knob 410 of the first drive assembly 401 to drive the second drive assembly 402 to move laterally. When the workbench 2 is directly below the puncture assembly 3, the lateral movement of the second drive assembly 402 is stopped and the screw is tightened to fix the slider 408 of the first drive assembly 401 in place. The user can also rotate the knob 410 of the third drive assembly 403 to drive the longitudinal movement of the puncture assembly 3. When the puncture assembly 3 is directly below or above the workbench 2, the longitudinal movement of the third drive assembly 403 is stopped and the screw is tightened to fix the slider 408 of the third drive assembly 403 in place.

[0029] Specifically, the puncture assembly 3 further includes a clamp 302 for clamping and fixing the heating puncture blade 301. In this embodiment, the clamp 302 is fixedly connected to the slider 408 of the third drive assembly 403, and the heating puncture blade 301 is fixed to the third drive assembly 403 via the clamp 302.

[0030] Specifically, the clamp 302 is provided with an adjustable clamping notch, which passes through the clamp 302 and accommodates the heating puncture blade head 301. In this embodiment, the clamping notch is an inner hole structure of the throat clamp, and the maximum diameter of the clamping notch can be reduced / increased by rotating the screw on the side of the throat clamp. The heating puncture blade head 301 is an electric soldering iron whose working head gradually increases in size as it extends backward. The maximum diameter of the clamping notch is greater than the maximum diameter of the clamping position of the heating puncture blade head 301, and the heating puncture blade head 301 can be installed and removed. In actual use, the technician places the heating puncture blade head 301 in the clamping notch, and then tightens the screw on the side of the clamping notch to reduce the diameter of the clamping notch, so that the clamp 302 clamps the heating puncture blade head 301. In particular, when the heating puncture blade head 301 is actually used, the working head is vertically downward.

[0031] Specifically, the workbench 2 is provided with a cylindrical puncture platform 201 for supporting the septum. A relief recess 202 is provided on the puncture platform 201, forming a through hole extending through the puncture platform 201 and accommodating the heated puncture blade 301. In this embodiment, the septum is laid flat on the upper surface of the puncture platform 201 and secured to the puncture platform 201 via a rubber band. The diameter of the relief recess is larger than the maximum diameter of the heated puncture blade 301. In actual use, the technician first turns the knob 410 of the first drive assembly 401 and / or the knob 410 of the third drive assembly 403, respectively, to adjust the puncture platform 201 to a position directly below the clamping assembly. The technician then turns the knob 410 of the second drive assembly 402 to raise the puncture platform 201 until the heated puncture blade 301 passes through the septum. At this point, the technician must hold the second knob 410 to prevent it from rotating. After waiting for 1 second, the knob 410 is released, allowing the puncture platform 201 to fall naturally. During multiple tests, the puncture platform 201 does not need to be directly below the heating puncture blade 301 and can be deviated by a certain distance. However, it should be noted that the puncture platform 201 must avoid colliding with the heating puncture blade 301 during the lifting process.

[0032] Specifically, the heating puncture tip 301 is an electric soldering iron. In actual use, the user heats the electric soldering iron to above 200°C, penetrates the diaphragm, stays there for 1 second, and then withdraws it. The diameter of the hole on the diaphragm is measured to quantitatively characterize the diaphragm's resistance to heat diffusion.

[0033] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A multi-point thermal puncture test device for a diaphragm, comprising a base (1) placed on an external supporting surface, a workbench (2) for supporting the diaphragm, a puncture assembly (3) placed above the workbench (2), and a drive device (4) for driving the workbench (2) close to the puncture assembly (3); characterized in that: The workbench (2) has an avoidance recess (202), a diaphragm carried by the workbench (2) covers the avoidance recess (202), and the puncture assembly (3) has a heating puncture blade head (301), which is used to puncture the diaphragm carried by the workbench (2) to extend into the avoidance recess (202).

2. The multi-point thermal puncture test device for a diaphragm according to claim 1, characterized in that: The driving device (4) comprises a first driving component (401) arranged on the base (1), and a second driving component (402) arranged on the first driving component (401) and connected to the workbench (2), wherein the first driving component (401) drives the second driving component (402) to reciprocate, and the second driving component (402) drives the workbench (2) to reciprocate, and the moving direction of the second driving component (402) intersects with the moving direction of the workbench (2); the driving component comprises a rotatably arranged gear (405) and a rack (406) meshing with the gear (405) and reciprocating.

3. The multi-point thermal puncture test device for a diaphragm according to claim 2, characterized in that: The driving device (4) further comprises a third driving assembly (403) arranged on the base (1) and connected to the puncture assembly (3); the third driving assembly (403) drives the puncture assembly (3) to reciprocate, and the moving direction of the second driving assembly (402) intersects with the moving direction of the puncture assembly (3).

4. The multi-point thermal puncture test device for a diaphragm according to claim 2, characterized in that: The driving assembly comprises a slide rail (407) and a slider (408) matched with the slide rail (407). The rack (406) is arranged on the slide rail (407). The slider (408) is provided with an avoidance notch (409) for accommodating the gear (405).

5. The multi-point thermal puncture test device for a diaphragm according to claim 4, characterized in that: The driving assembly further includes a knob (410), which protrudes from the slider (408), is rotatably connected to the slider (408), and the gear (405) is fixedly arranged at one end of the knob (410).

6. The multi-point thermal puncture test device for a diaphragm according to claim 4, characterized in that: The drive assembly is further provided with a bolt fixing mechanism (411), which is rotatably connected to the slider (408), and the bolt fixing mechanism (411) abuts against the slide rail (407), and is used to limit the relative movement between the slider (408) and the slide rail (407).

7. The multi-point thermal puncture test device for a diaphragm according to claim 1, characterized in that: The puncture assembly (3) further comprises a clamp (302), and the clamp (302) is used for clamping and fixing the heating puncture blade head (301).

8. The multi-point thermal puncture test device for a diaphragm according to claim 7, characterized in that: The clamp (302) is provided with an adjustable clamping notch, the clamping notch passes through the clamp (302), and the clamping notch accommodates the heating puncture blade head (301).

9. The multi-point thermal penetration test device for a diaphragm according to claim 1, characterized in that: The workbench (2) is provided with a puncture table (201) of a cylindrical structure for supporting a diaphragm, and an avoidance recess (202) is provided on the puncture table (201) to form a through hole penetrating the puncture table (201), and the through hole accommodates a heating puncture blade (301).

10. The multi-point thermal puncture test device for a diaphragm according to claim 1, characterized in that: The heating puncture blade (301) is an electric soldering iron.

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