Explosion pressure detection device for explosion-proof valve

Abstract

The utility model discloses an explosion pressure detection device for an explosion-proof valve, which comprises a box body, a cover body and an air inlet pipe, a test bin is arranged in the box body, the top of the test bin is provided with a first boss for supporting the explosion-proof valve, and the center of the first boss is provided with a first pressure relief hole communicated with the test bin; a first sealing piece is arranged on the upper end face of the first boss; a second pressure relief hole corresponding to the first pressure relief hole is formed in the bottom of the cover body; and the air inlet pipe is communicated with the test bin. According to the utility model, only the first boss at the opening of the test bin and the explosion-proof valve are required to realize sealing, so that the risk of gas leakage of the test bin is reduced. The cover body and the box body are connected through the fastening bolts, the cover body and the box body are tightly connected through the fastening bolts, effective pressing of the anti-explosion valve can be achieved in the bolt pre-tightening process, and operation is simpler and more convenient.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and in particular to an explosion-proof valve burst pressure detection device. Background Technology

[0002] Lithium-ion batteries, with their advantages of high energy density, long cycle life, low self-discharge rate, and being environmentally friendly and pollution-free, are widely used in the power battery and energy storage industries. However, battery safety is also a major concern. To improve safety during use and reduce the harm in the event of a battery explosion, explosion-proof valves are typically installed on the battery cover during structural design. In the event of an internal short circuit or puncture, the internal temperature of the battery rises sharply, generating a large amount of gas. When the internal pressure reaches the burst pressure of the explosion-proof valve, the gas will rupture the valve, releasing internal pressure and reducing the risk of an explosion. Because the burst pressure of the explosion-proof valve is crucial to the safety of the battery during use, the burst pressure of the explosion-proof valve on the battery cover needs to be tested during battery production.

[0003] Existing explosion-proof valve burst pressure testing devices sometimes require the cover plate to be welded to the aluminum shell, or the battery welding process to be completely completed before the entire battery can be tested for the explosion-proof valve burst pressure. This method leads to a waste of production capacity and battery raw materials. Other testing devices can test the battery top cover explosion-proof valve separately. For example, patent CN220982600U, "A Testing Device for a Battery Top Cover Explosion-proof Valve," mainly includes a base, a cover plate, and a testing chamber. The testing chamber has a first sealed chamber adapted to the positive terminal in the battery top cover and a second sealed chamber adapted to the negative terminal in the battery top cover. Each of the testing chamber, the first sealed chamber, and the second sealed chamber has its own independent air inlet channel. A sealing component to prevent gas leakage from the testing chamber is provided on the side of the cover plate near the base. This testing device can test the explosion-proof valve burst pressure of the battery cover separately. However, due to its multi-seal structure, poor sealing can easily lead to gas leakage risks, resulting in inaccurate burst pressure tests. Utility Model Content

[0004] The purpose of this invention is to provide a device for detecting the burst pressure of an explosion-proof valve. This device only requires sealing the explosion-proof valve, reducing the problem of inaccurate burst pressure testing caused by poor sealing of the entire cavity. This significantly improves the accuracy of burst pressure detection.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model discloses a device for detecting the burst pressure of an explosion-proof valve, comprising:

[0007] The enclosure contains a test chamber. The top of the test chamber is provided with a first protrusion for supporting the explosion-proof valve. The center of the first protrusion is provided with a first pressure relief hole that communicates with the test chamber. The upper surface of the first protrusion is provided with a first sealing element.

[0008] The cover has a second pressure relief hole at its bottom, which corresponds to the first pressure relief hole.

[0009] The air intake pipe is connected to the test chamber.

[0010] A further solution: multiple light holes are provided at the bottom edge of the cover, and threaded holes corresponding to the light holes are provided on the box body, with fastening bolts passing through the light holes and threaded holes.

[0011] A further solution: The top of the box is provided with a positioning pin, and the cover is provided with a positioning hole that matches the positioning pin.

[0012] A further solution: the top of the locating pin has a chamfered structure.

[0013] A further solution: The top of the test chamber is provided with at least three positioning blocks, one end of which is rotatably connected to the test chamber and the other end is provided with a positioning protrusion.

[0014] A further solution: the height of the positioning block is consistent with the height of the first boss.

[0015] A further solution: A second sealing element is provided at the connection between the test chamber and the bottom of the box.

[0016] A further embodiment: The bottom of the cover has a flange, and the outer periphery of the second pressure relief hole is provided with a second boss that is the same height as the flange.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention only requires sealing the first protrusion at the test chamber opening and the explosion-proof valve, reducing the risk of gas leakage from the test chamber. The cover and the housing are connected by fastening bolts, which tightly connect the cover and the housing, and effectively compress the explosion-proof valve during bolt pre-tightening, making operation simpler. Furthermore, this invention has excellent adaptability, flexibly meeting the testing needs of battery cover plates of different thicknesses, and has strong versatility. The positioning block can achieve more precise and stable blocking and positioning for battery cover plates of different planar dimensions, further enhancing the compatibility and practicality of this device. Attached Figure Description

[0019] Figure 1 This is a perspective view of the box body in this utility model;

[0020] Figure 2 This is a perspective view of the cover body in this utility model;

[0021] Figure 3 This is a side sectional view of the housing in this utility model;

[0022] Figure 4 , Figure 5 This is a schematic diagram of the installation of this utility model;

[0023] In the diagram: 1-box body, 11-test chamber, 12-first boss, 13-first pressure relief hole, 14-threaded hole, 15-positioning pin, 2-cover, 21-second pressure relief hole, 22-clear hole, 23-positioning hole, 24-flange, 25-second boss, 3-air inlet pipe, 4-first seal, 5-positioning block, 51-positioning protrusion, 6-second seal, 7-explosion-proof valve, 8-battery cover. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Please see Figure 1-3 In this embodiment, an explosion-proof valve burst pressure detection device includes a housing 1, a cover 2, and an air inlet pipe 3, wherein:

[0027] The housing 1 contains a sealed test chamber 11. The top of the test chamber 11 has a first protrusion 12, and the center of the first protrusion 12 has a first pressure relief hole 13 that communicates with the test chamber 11. The upper end face of the first protrusion 12 has a first sealing element 4, and the first protrusion 12 is sealed to the explosion-proof valve 7 through the first sealing element 4 to support and position the explosion-proof valve 7. The bottom of the cover 2 has a second pressure relief hole 21 that communicates with the first pressure relief hole 13. The air inlet pipe 3 is connected to the test chamber 11.

[0028] By sealing the housing 1 and the cover 2 together, the first pressure relief hole 13 is sealed to the explosion-proof valve 7. Then, a pressure gas source is connected via the air inlet pipe 3, gradually increasing the gas pressure in the test chamber 11 to the set value. During the test, the opening and closing of the explosion-proof valve is observed. If the explosion-proof valve 7 opens, the gas in the test chamber 11 will sequentially leak out through the first pressure relief hole 13 and the second pressure relief hole 21.

[0029] Furthermore, an annular groove is provided on the upper end face of the first boss 12, and the first sealing element 4 is placed in the annular groove. The first sealing element 4 is set as a sealing ring, and its height is slightly higher than the upper end face of the first boss 12. When the first pressure relief hole 13 is connected with the second pressure relief hole 21, the sealing ring is deformed by the pressure of the cover body 2, which plays a sealing role.

[0030] Furthermore, the bottom edge of the cover 2 has multiple light holes 22, and the housing 1 has threaded holes 14 that match the light holes 22. Fastening bolts pass through the light holes 22 and the threaded holes 14. When the housing 1 is connected to the cover 2, the pressure of the cover 2 on the explosion-proof valve 7 is ensured by pre-tightening the fastening bolts. In addition, by adjusting the tightening of the fastening bolts, it is possible to adapt to the clamping of battery cover plates 8 of different thicknesses.

[0031] Furthermore, the top of the housing 1 is provided with a positioning pin 15, and the cover 2 is provided with a positioning hole 23 that matches the positioning pin 15. The top of the positioning pin 15 has a chamfered structure. The positioning pin 15 and the positioning hole 23 help to connect and align the cover 2 and the housing 1 when the cover is closed, and the chamfered structure makes the connection and alignment operation smoother.

[0032] Furthermore, the top of the test chamber 11 is provided with four positioning blocks 5. One end of the positioning block 5 is rotatably connected to the test chamber 11, and the other end is provided with a positioning protrusion 51. The positioning block 5 can rotate freely to fix the battery cover plate 8 around its perimeter, which helps to align the explosion-proof valve 7 with the center of the first protrusion 12.

[0033] Furthermore, the height of the positioning block 5 is consistent with the height of the first protrusion 12, allowing the battery cover 8 to be placed stably on the plane constructed by the first protrusion 12 and the positioning block 5. The height of the positioning protrusion 51 is slightly higher than that of the positioning block 5, which facilitates blocking and positioning the edge of the battery cover 8.

[0034] Furthermore, a second sealing element 6 is provided at the connection between the test chamber 11 and the bottom of the housing 1. The test chamber 11 is a box with its opening facing downwards. To ensure the airtightness of the connection between its opening edge and the housing 1, a second sealing element 6, which is a sealing rubber ring, is provided at the connection. In other embodiments, the test chamber 11 and the housing 1 can also be designed as an integral piece to further improve the airtightness of the structure.

[0035] Furthermore, the bottom of the cover 2 has a flange 24, forming a cavity in the middle of the cover 2 to avoid protruding terminals or other components on the battery cover plate 8. The outer periphery of the second pressure relief hole 21 is provided with a second boss 25 of the same height as the flange 24; the explosion-proof valve 7 is clamped between the second boss 25 and the first boss 12, and the first boss 12 and the battery cover plate 8 are sealed by the first sealing member 4.

[0036] Please continue reading. Figure 4-5 In use, firstly, place the battery cover 8 with the explosion-proof valve onto the test chamber 11, aligning the explosion-proof valve 7 with the first protrusion 12. Then, rotate the positioning block 5 to fix the outer periphery of the battery cover 8 with the positioning protrusion 51. Place the cover 2 onto the housing 1, and sequentially pass the fastening bolts through the corresponding light holes 22 and threaded holes 14, pre-tightening the bolts to ensure the explosion-proof valve 7 is tightly clamped between the first protrusion 12 and the second protrusion 25. Connect the air inlet pipe 3 to the pressure air source, turn on the pressure air source, and gradually increase the air pressure inside the test chamber 11 to the preset value. Observe and record the opening and closing of the explosion-proof valve 7 during the process.

[0037] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0038] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A device for detecting the burst pressure of an explosion-proof valve, characterized in that, include: The box (1) has a test chamber (11) inside. The top of the test chamber (11) is provided with a first boss (12) for supporting the explosion-proof valve (7). The center of the first boss (12) is provided with a first pressure relief hole (13) that communicates with the test chamber (11). The upper end face of the first boss (12) is provided with a first sealing element (4). The cover (2) has a second pressure relief hole (21) at its bottom, which corresponds to the first pressure relief hole (13). The air intake pipe (3) is connected to the test chamber (11).

2. The explosion-proof valve burst pressure detection device according to claim 1, characterized in that, The bottom edge of the cover (2) is provided with multiple light holes (22), and the box (1) is provided with threaded holes (14) corresponding to the light holes (22). Fastening bolts are provided through the light holes (22) and the threaded holes (14).

3. The explosion-proof valve burst pressure detection device according to claim 1, characterized in that, The top of the box (1) is provided with a positioning pin (15), and the cover (2) is provided with a positioning hole (23) that matches the positioning pin (15).

4. The explosion-proof valve burst pressure detection device according to claim 3, characterized in that, The top of the positioning pin (15) has a chamfered structure.

5. The explosion-proof valve burst pressure detection device according to claim 1, characterized in that, The test chamber (11) is provided with at least three positioning blocks (5) on the top. One end of the positioning block (5) is rotatably connected to the test chamber (11), and the other end is provided with a positioning protrusion (51).

6. The explosion-proof valve burst pressure detection device according to claim 5, characterized in that, The height of the positioning block (5) is consistent with the height of the first boss (12).

7. The explosion-proof valve burst pressure detection device according to claim 1, characterized in that, The test chamber (11) is provided with a second sealing element (6) at the connection between the bottom of the box (1) and the test chamber (1).

8. The explosion-proof valve burst pressure detection device according to claim 1, characterized in that, The bottom of the cover (2) has a flange (24), and the outer periphery of the second pressure relief hole (21) is provided with a second boss (25) that is the same height as the flange (24).

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