Helium detection airtightness test tool

Abstract

The utility model discloses a helium detection air tightness test tool comprising an outer sleeve, the upper end of which is provided with a cover plate; the outer frame mechanism comprises a body, a lock nut arranged above the body and an anti-explosion valve arranged on the inner side of the outer sleeve, and an air inlet connector is arranged on one side of the body; the stretching mechanism is hermetically connected with the body; the handle mechanism is connected to the upper end of the lock nut; the indicating rod mechanism is installed on the inner side of the outer sleeve. According to the helium detection airtight test tool, the eccentric handle is controlled to attract the top cover of the explosion-proof valve through the principle of strong magnetism under the condition that the edge of the outer sleeve is matched with the groove of the explosion-proof valve, and the attraction distance can be effectively controlled; secondary installation and the like caused by the fact that the distance is too small or whether the top cover of the anti-explosion valve is sucked up or not cannot be guaranteed in the inflation process are prevented, the stability is improved, and control is better carried out.

Description

Technical Field

[0001] This utility model relates to the field of sealing detection technology, and in particular to a helium gas tightness testing fixture. Background Technology

[0002] In battery manufacturing, the sealing test of the battery top cover is a crucial step, as its seal directly determines the battery's safety performance. A poor seal can lead to electrolyte leakage, casing expansion, fire, and explosion, posing a significant threat to battery manufacturers and consumers. Currently, the lithium-ion battery industry primarily uses leak detection methods such as immersion testing, gas detection, pressure drop testing, differential pressure testing, flow rate testing, and helium mass spectrometry (HMS). Among these, HMS leak detection offers the highest accuracy and is therefore widely used.

[0003] Most helium testing fixtures are sealed with gaskets, making it impossible to identify whether the gaskets are in contact with the components or whether there are any leaks during the process. Helium leak testing typically involves gas entering and exiting from the explosion-proof valve. There are many ways to lift the explosion-proof valve, such as using suction cups or strong magnets, but their stability needs to be verified.

[0004] Based on the above-mentioned technical problems, those skilled in the art urgently need to develop a helium leak detection fixture that is simple in structure, can effectively control the distance that the explosion-proof valve is lifted, and has high stability. Utility Model Content

[0005] The purpose of this invention is to provide a helium leak detection fixture with a simple structure, which can effectively control the distance the explosion-proof valve is lifted and has high stability.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a helium leak detection testing fixture, which includes:

[0008] The outer cover has a cover plate at the top;

[0009] The outer frame mechanism includes a body and a lock nut located above the body, as well as an explosion-proof valve arranged inside the outer casing, and an air inlet connector is provided on one side of the body.

[0010] The stretching mechanism is sealed to the main body. Gas enters from the main body and passes through the stretching mechanism and the explosion-proof valve into the battery pack.

[0011] The testing fixture also includes:

[0012] A handle mechanism is connected to the upper end of the lock nut. By adjusting the handle mechanism, the tensioning mechanism is pulled to move the explosion-proof valve cover.

[0013] An indicator rod mechanism is installed inside the outer casing, and the opening or closing of the explosion-proof valve cover is determined by the indicator rod mechanism.

[0014] Furthermore, the tensioning mechanism includes a lower spindle connected to the handle mechanism; and

[0015] A tension shaft connected to the lower end of the lower mandrel, the tension shaft being sealed to the body by a first O-ring; and

[0016] A compression spring fitted under the tension shaft;

[0017] A magnet is located at the bottom of the stretching shaft, and the magnet is used to attract the explosion-proof valve cover.

[0018] Furthermore, the handle mechanism includes an adjusting ring disposed at the upper end of the lock nut; and

[0019] A hinge seat is installed on the upper end of the adjusting ring, and a double ring is provided on one side of the hinge seat;

[0020] A pin that passes laterally through the hinge seat;

[0021] A handle connected to the pin.

[0022] Furthermore, the indicator lever mechanism includes a spring that is connected to the cover plate via a washer;

[0023] An indicator rod is connected to the bottom of the spring. The indicator rod is inserted into the explosion-proof valve, and the connection between the indicator rod and the explosion-proof valve is sealed by a third O-ring.

[0024] Preferably, the explosion-proof valve is positioned with the outer casing by a positioning pin.

[0025] Preferably, the junction between the body and the cover plate is sealed by a second O-ring.

[0026] Preferably, the explosion-proof valve is provided with an explosion-proof valve rubber ring at the bottom.

[0027] In the above technical solution, the helium leak detection testing fixture provided by this utility model has the following features:

[0028] Beneficial effects:

[0029] This utility model's helium leak detection fixture utilizes the principle of strong magnetism. When the edge of the outer casing matches the groove of the explosion-proof valve, the eccentric handle is controlled to lift the top cover of the explosion-proof valve. The lifting distance can be effectively controlled, preventing secondary installation due to insufficient distance or inability to guarantee whether the top cover of the explosion-proof valve is lifted during the inflation process. This improves stability and allows for better operation. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0031] Figure 1 A schematic diagram of the overall structure of the helium detection air tightness testing fixture provided in this embodiment of the utility model;

[0032] Figure 2 The helium detection gas tightness testing fixture provided for the embodiments of this utility model Figure 1 Cross-sectional view at point AA.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Outer casing; 2. Cover plate; 3. Outer frame mechanism; 4. Tensioning mechanism; 5. Handle mechanism; 6. Indicator rod mechanism; 7. Second O-ring;

[0035] 301. Body; 302. Lock nut; 303. Explosion-proof valve; 304. Air inlet connector; 305. Positioning pin; 306. Explosion-proof valve rubber ring;

[0036] 401. Lower mandrel; 402. Tensioning shaft; 403. First O-ring; 404. Compression spring; 405. Magnet;

[0037] 501. Adjusting ring; 502. Hinge seat; 503. Double ring; 504. Pin; 505. Handle;

[0038] 601, gasket; 602, spring; 603, indicator rod; 604, third O-ring. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0040] See Figures 1-2 As shown;

[0041] This utility model discloses a helium leak detection testing fixture, which includes:

[0042] Outer cover 1, with a cover plate 2 attached to its upper end;

[0043] The outer frame mechanism 3 includes a body 301 and a lock nut 302 located above the body 301, as well as an explosion-proof valve 303 located inside the outer casing 1, and an air inlet connector 304 is provided on one side of the body 301.

[0044] The tensioning mechanism 4 is sealed to the body 301. Gas enters from the body 301 and passes through the tensioning mechanism 3 and the explosion-proof valve 303 into the battery pack.

[0045] The testing fixture also includes:

[0046] The handle mechanism 5 is connected to the upper end of the lock nut 302. By adjusting the handle mechanism 5, the tensioning mechanism 4 is pulled to make the valve cover of the explosion-proof valve 303 move.

[0047] The indicator rod mechanism 6 is installed inside the outer casing 1, and the opening or closing of the valve cover of the explosion-proof valve 303 is determined by the indicator rod mechanism 6.

[0048] As a further description of this embodiment, the tensioning mechanism 4 includes a lower spindle 401 connected to the handle mechanism 5; and

[0049] A tension shaft 402 is connected to the lower end of the lower mandrel 401. The tension shaft 402 is sealed to the body 301 by a first O-ring 403 to ensure that compressed air enters the tension shaft 402; and

[0050] A compression spring 404 is sleeved on the lower part of the tension shaft 402;

[0051] A magnet 405 is located at the bottom of the tension shaft 402, and the magnet 405 is used to attract the valve cover of the explosion-proof valve 303. Gas enters the tension shaft 402 through the body 301, passes through the central hole of the tension shaft 402 to the explosion-proof valve 303, and then enters the battery pack.

[0052] As a further description of this embodiment, the handle mechanism 5 includes an adjusting ring 501 disposed at the upper end of the lock nut 302; and

[0053] A hinge seat 502 is installed on the upper end of the adjusting ring 501, and a double ring 503 is provided on one side of the hinge seat 502;

[0054] A pin 504 is provided that passes laterally through the hinge seat 502;

[0055] A handle 505 is connected to the pin 504. In use, using the principle of an eccentric handle, the tension shaft 402 is pulled up, and the valve cover of the explosion-proof valve 303 is attracted up by the bottom magnet 405. Loosening the lock nut 302 and rotating the adjusting ring 501 can adjust the distance between the magnet 405 and the surface of the explosion-proof valve 303, effectively increasing the adsorption distance on the surface of the explosion-proof valve 303, thereby increasing the air intake space.

[0056] As a further description of this embodiment, the indicator rod mechanism 6 includes a spring 602 connected to the cover plate 2 via a washer 601; specifically, the washer 601 is model SWR37-35 and the spring 602 is model VUL5-40.

[0057] An indicator rod 603 is connected to the bottom of the spring 602. The indicator rod 603 is inserted into the explosion-proof valve 303, and the connection point with the explosion-proof valve 303 is sealed by a third O-ring 604. In this embodiment, the position of the indicator rod 603 is used to confirm whether the valve cover of the explosion-proof valve 303 is completely attracted by the magnet 405, ensuring that compressed air can enter the battery pack.

[0058] As a preferred technical solution in this embodiment, the explosion-proof valve 303 is positioned with the outer casing 1 by a positioning pin 305.

[0059] As a preferred technical solution in this embodiment, the junction between the body 301 and the cover plate 2 is sealed by a second O-ring 7.

[0060] As a preferred technical solution in this embodiment, the bottom of the explosion-proof valve 303 is provided with an explosion-proof valve rubber ring 306.

[0061] In the above technical solution, the helium leak detection testing fixture provided by this utility model has the following features:

[0062] Beneficial effects:

[0063] This utility model's helium leak detection fixture utilizes the principle of strong magnetism. When the edge of the outer casing matches the groove of the explosion-proof valve, the eccentric handle is controlled to lift the top cover of the explosion-proof valve. The lifting distance can be effectively controlled, preventing secondary installation due to insufficient distance or inability to guarantee whether the top cover of the explosion-proof valve is lifted during the inflation process. This improves stability and allows for better operation.

[0064] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A helium leak detection fixture, characterized in that, The testing fixture includes: The outer cover (1) has a cover plate (2) attached to its upper end; The outer frame mechanism (3) includes a body (301) and a lock nut (302) located above the body (301), as well as an explosion-proof valve (303) arranged inside the outer casing (1), and an air inlet connector (304) is provided on one side of the body (301). The tensioning mechanism (4) is sealed to the body (301). Gas enters from the body (301) and enters the battery pack through the explosion-proof valve (303) via the tensioning mechanism (4). The testing fixture also includes: The handle mechanism (5) is connected to the upper end of the lock nut (302). By adjusting the handle mechanism (5), the tensioning mechanism (4) is pulled to make the valve cover of the explosion-proof valve (303) move. An indicator rod mechanism (6) is installed inside the outer casing (1) to determine whether the cover of the explosion-proof valve (303) is open or closed.

2. The helium leak detection fixture according to claim 1, characterized in that, The tensioning mechanism (4) includes a lower spindle (401) connected to the handle mechanism (5); and A tension shaft (402) is connected to the lower end of the lower mandrel (401), and the tension shaft (402) is sealed to the body (301) by a first O-ring (403); and A compression spring (404) sleeved on the lower part of the tension shaft (402); A magnet (405) is provided at the bottom of the tension shaft (402), and the magnet (405) is used to attract the valve cover of the explosion-proof valve (303).

3. The helium leak detection fixture according to claim 1, characterized in that, The handle mechanism (5) includes an adjusting ring (501) located at the upper end of the lock nut (302); and A hinge seat (502) is installed on the upper end of the adjusting ring (501), and a double ring (503) is provided on one side of the hinge seat (502); A pin (504) is provided laterally through the hinge seat (502); A handle (505) is connected to the pin (504).

4. The helium leak detection fixture according to claim 1, characterized in that, The indicator rod mechanism (6) includes a spring (602) connected to the cover plate (2) via a washer (601); An indicator rod (603) is connected to the bottom of the spring (602). The indicator rod (603) is inserted into the explosion-proof valve (303), and the connection between the indicator rod (603) and the explosion-proof valve (303) is sealed by a third O-ring (604).

5. The helium leak detection fixture according to claim 1, characterized in that, The explosion-proof valve (303) is positioned with the outer casing (1) by a positioning pin (305).

6. The helium leak detection fixture according to claim 1, characterized in that, The junction between the body (301) and the cover plate (2) is sealed by a second O-ring (7).

7. The helium leak detection fixture according to any one of claims 1 to 6, characterized in that, The explosion-proof valve (303) is provided with an explosion-proof valve rubber ring (306) at its bottom.

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