Explosion relief valve for battery

Abstract

The utility model relates to the technical field of explosion relief valves, in particular to an explosion relief valve for a battery, which comprises a lithium battery body, a top cover arranged at the top of the lithium battery body, a relief valve main body arranged in a vent groove, a limit ring arranged on the upper surface of the top cover close to the vent groove, and positioning blocks symmetrically arranged at the top of the inner wall of the vent groove. Positioning grooves are formed in the same ends of the clamping columns, fixing rings are arranged on the outer walls of the inserting columns, and sealing gaskets are arranged at the bottoms of the fixing rings; according to the explosion safety valve used on the battery, the clamping columns with the positioning grooves are arranged, the positioning grooves are matched with the corresponding positioning blocks in an inserted mode, the safety valve body is matched with the vent grooves in the top cover in an inserted mode, the sealing plugs with the protruding pads are matched with the circular grooves in an inserted mode through springs, and the protruding pads are matched with the vent holes in an inserted mode, so that the sealing performance of the bottoms of the inserting columns is improved; and under cooperation of the anti-skid columns, the contact area is increased, then rotating adjustment cooperation of the safety valve body is facilitated, and under cooperation of the gas release holes, gas exhausted through internal extrusion is discharged.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof safety valves, in particular to an explosion-proof safety valve used on a battery. Background Art

[0002] Lithium-ion batteries have advantages such as high operating voltage, good large current discharge performance and high energy density. Lithium-ion batteries cannot be overcharged or over-discharged. Once overcharged or over-discharged, part of the electrolyte will decompose and produce gas, and the battery will swell, causing the battery shell to expand, resulting in a decrease in the tightness of the internal assembly, an increase in the conductive resistance of the positive and negative electrodes, and a decrease in electrical performance; if the gas is accumulated multiple times or continuously, the internal pressure is too high and the shell will burst, requiring an explosion-proof safety valve to increase safety;

[0003] The utility model with the announcement number CN216818548U discloses a safety valve for a battery of an explosion-proof battery electric locomotive, comprising a battery housing and a safety valve body, wherein the safety valve body is connected to the battery housing by a thread, a top plate is arranged above the safety valve body, a connecting rod is uniformly welded to the lower surface of the top plate, the bottom end of the connecting rod penetrates the upper surface of the safety valve body and is welded to an annular bottom plate, and a second tooth is uniformly integrally formed on the lower surface of the annular bottom plate, and the first tooth and the second tooth can be meshed with each other by pressing the top plate, thereby completing the restriction of the position of the safety valve body, and when the top plate is pressed, the position of the top plate can be restricted by the third tooth and the fourth tooth, thereby making the safety valve body more firmly fixed;

[0004] The above technical solution installs the safety valve firmly, avoids the safety valve from falling off due to external shaking or bumping, and improves the safety of the battery; however, the explosion-proof safety valve is not easy to disassemble and install quickly, and the safety valve is not easy to stably release pressure. Utility Model Content

[0005] The purpose of the utility model is to provide an explosion-proof safety valve for a battery to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An explosion-proof safety valve for a battery, comprising a lithium battery body, a top cover is provided on the top of the lithium battery body, a ventilation groove is opened in the middle of the top cover, a safety valve body is provided in the ventilation groove, a limiting ring is provided on the upper surface of the top cover near the ventilation groove, positioning blocks are symmetrically provided at the top of the inner wall of the ventilation groove, insertion posts are provided at the bottom of the safety valve body, ventilation holes are opened in the middle of the insertion posts, clamping posts are provided on the outer wall of the insertion posts corresponding to the positioning blocks, positioning grooves are opened at the same end of the clamping posts, fixing rings are provided on the outer wall of the insertion posts, and sealing gaskets are provided at the bottom of the fixing rings.

[0008] Further, the width of the outer wall of the top cover is adapted to the width of the outer wall of the lithium battery body, and the top cover is adhesively fixed to the lithium battery body.

[0009] In the present utility model, the cooperation between the top cover and the lithium battery body helps to provide internal protection.

[0010] Specifically, the top of the insertion post is welded and fixed to the safety valve body, a circular groove is opened at the top of the insertion post, a sealing plug is provided in the circular groove, a spring is provided on the top of the sealing plug, one end of the spring is adhesively fixed to the top of the sealing plug, and the other end of the spring is adhesively fixed to the safety valve body.

[0011] In the present utility model, the spring has telescopic elasticity, and under the extrusion cooperation of the spring, the sealing plug seals the bottom of the circular groove.

[0012] Secondly, through holes communicating with the inside of the circular groove are opened at the top of the outer wall of the insertion post.

[0013] In the present utility model, with the cooperation of multiple through holes, it helps the exhaust inside the circular groove, and further realizes the exhaust inside the lithium battery body, avoiding the influence of excessive internal pressure and explosion.

[0014] It should be noted that the outer diameter of the sealing plug is adapted to the inner diameter of the circular groove, a convex pad is provided at the bottom of the sealing plug, the top of the convex pad is adhesively fixed to the bottom of the sealing plug, and the outer diameter of the convex pad is adapted to the inner diameter of the ventilation hole.

[0015] In the present utility model, by providing the convex pad and cooperating with the sealing plug, the ventilation hole at the bottom of the circular groove is sealed, further increasing the sealing stability.

[0016] Further, the inner wall of the fixing ring is adhesively fixed to the outer wall of the insertion post, the top of the sealing gasket is adhesively fixed to the bottom of the fixing ring, the outer diameter of the sealing gasket is adapted to the inner diameter of the limiting ring, and the outer diameter of the sealing gasket is smaller than the inner diameter of the safety valve body.

[0017] In the present utility model, the setting of the fixing ring helps to increase the tightness of the sealing gasket against the top cover, reducing the influence of air leakage and liquid leakage from the ventilation groove.

[0018] It is worth adding that the positioning block is in the shape of an arc plate, the positioning block is adhesively fixed to the insertion post, the clamping post is adhesively fixed to the insertion post, and the width of the inner wall of the positioning groove is adapted to the width of the outer wall of the positioning block.

[0019] In the present utility model, the positioning block is inserted and matched with the positioning groove, which increases the stability of the installation between the insertion post and the top cover. Among them, an anti-backflow hopper is also provided in the ventilation hole. With the cooperation of the anti-backflow hopper, the influence of the internal liquid flowing out along the inner wall of the insertion post is reduced.

[0020] Furthermore, several anti-slip posts are provided on the outer wall of the main body of the safety valve near the top. The anti-slip posts are distributed at equal intervals in a ring shape, and the anti-slip posts and the main body of the safety valve are of an integrally formed structure. A vent hole communicating with the inside is opened on the outer wall of the main body of the safety valve near the bottom. The vent holes are distributed at equal intervals in a ring shape.

[0021] In the present utility model, with the cooperation of multiple anti-slip posts, the contact area is increased, and thus the friction force is increased. With the cooperation of multiple vent holes, it is helpful for the exhaust and pressure reduction inside the main body of the safety valve.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] 1. By setting a clamping post with a positioning groove, and the positioning groove is inserted and matched with the corresponding positioning block, the main body of the safety valve is inserted and matched with the ventilation groove on the top cover. The sealing plug with a convex pad is inserted and matched with the round groove through a spring, and the convex pad is inserted and matched with the ventilation hole, which increases the sealing performance at the bottom of the insertion post. With the cooperation of the anti-slip posts, the contact area is increased, which is convenient for the rotation and adjustment of the main body of the safety valve. With the cooperation of the vent holes, the gas squeezed out inside is discharged.

[0024] 2. By setting an anti-backflow hopper, it is avoided that the liquid inside the lithium battery body flows out along the inner wall of the insertion post. When the air pressure inside the lithium battery body is greater than the deformation value of the spring, the spring contracts, and the sealing plug with a convex pad moves upward. The internal gas is discharged from the ventilation hole to the inside of the round groove and discharged from the vent hole, avoiding the influence of the explosion of the lithium battery body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall combined structure of the present utility model;

[0026] Figure 2 is a schematic diagram of the combined structure of the top cover and the main body of the safety valve of the present utility model;

[0027] Figure 3 is a schematic diagram of the inverted structure of the main body of the safety valve of the present utility model;

[0028] Figure 4 is a schematic cross-sectional structure diagram of the main body of the safety valve of the present utility model;

[0029] Figure 5 Schematic cross-sectional structure diagram of the safety valve body of the present utility model with the sealing plug removed;

[0030] Figure 6 Schematic structure diagram of the sealing plug of the present utility model.

[0031] The meanings of each label in the figure are as follows:

[0032] 1. Lithium battery body;

[0033] 2. Top cover; 20. Limit ring; 21. Ventilation groove; 210. Positioning block;

[0034] 3. Safety valve body; 30. Insertion post; 300. Ventilation hole; 301. Anti-tipping bucket; 302. Fixed ring; 303. Circular groove; 304. Perforation; 31. Sealing gasket; 32. Clamping post; 320. Positioning groove; 33. Anti-slip post; 34. Sealing plug; 340. Spring; 341. Convex pad; 35. Air leakage hole. Specific implementation manner

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] Please refer to Figures 1-6 , this embodiment provides a technical solution:

[0037] An explosion-proof safety valve for a battery includes a lithium battery body 1. A top cover 2 is provided on the top of the lithium battery body 1. The width of the outer wall of the top cover 2 is adapted to the width of the outer wall of the lithium battery body 1, and the top cover 2 is adhesively fixed to the lithium battery body 1.

[0038] In the present utility model, the cooperation between the top cover 2 and the lithium battery body 1 helps to provide protection for the interior.

[0039] Furthermore, a ventilation groove 21 is opened in the middle of the top cover 2. A safety valve body 3 is provided in the ventilation groove 21. A limit ring 20 is provided on the upper surface of the top cover 2 near the ventilation groove 21. Positioning blocks 210 are symmetrically provided at the top of the inner wall of the ventilation groove 21. An insertion post 30 is provided at the bottom of the safety valve body 3. The top of the insertion post 30 is welded and fixed to the safety valve body 3. A circular groove 303 is opened at the top of the insertion post 30. A sealing plug 34 is provided in the circular groove 303. A spring 340 is provided at the top of the sealing plug 34. One end of the spring 340 is adhesively fixed to the top of the sealing plug 34, and the other end of the spring 340 is adhesively fixed to the safety valve body 3.

[0040] In the present utility model, the spring 340 has telescopic elasticity. Under the extrusion and cooperation of the spring 340, the sealing plug 34 seals and cooperates with the bottom of the circular groove 303.

[0041] Specifically, a perforation 304 communicating with the inside of the circular groove 303 is provided on the outer wall of the insertion post 30 near the top.

[0042] It should be noted that a ventilation hole 300 is provided in the middle of the insertion post 30. Clamping posts 32 are provided on the outer wall of the insertion post 30 corresponding to the positioning blocks 210. Positioning grooves 320 are provided at the same end of the clamping posts 32. Fixing rings 302 are provided on the outer wall of the insertion post 30. A sealing gasket 31 is provided at the bottom of the fixing ring 302.

[0043] Furthermore, the inner wall of the fixing ring 302 is adhesively fixed to the outer wall of the insertion post 30. The top of the sealing gasket 31 is adhesively fixed to the bottom of the fixing ring 302. The outer diameter of the sealing gasket 31 is adapted to the inner diameter of the limiting ring 20, and the outer diameter of the sealing gasket 31 is smaller than the inner diameter of the safety valve body 3.

[0044] In the present utility model, the provision of the fixing ring 302 helps to increase the tightness of the sealing gasket 31 against the top cover 2 and reduce the influence of air leakage and liquid leakage from the ventilation groove 21.

[0045] Specifically, with the cooperation of multiple perforations 304, it helps the exhaust cooperation inside the circular groove 303, and further realizes the exhaust inside the lithium battery body 1, avoiding the influence of explosion caused by too high internal pressure.

[0046] Secondly, the outer diameter of the sealing plug 34 is adapted to the inner diameter of the circular groove 303. A convex pad 341 is provided at the bottom of the sealing plug 34. The top of the convex pad 341 is adhesively fixed to the bottom of the sealing plug 34. The outer diameter of the convex pad 341 is adapted to the inner diameter of the ventilation hole 300.

[0047] In the present utility model, by providing the convex pad 341 and cooperating with the sealing plug 34, the ventilation hole 300 at the bottom of the circular groove 303 is sealed, further increasing the stability of the seal.

[0048] It is worth adding that the positioning block 210 is in the shape of an arc plate. The positioning block 210 is adhesively fixed to the insertion post 30. The clamping post 32 is adhesively fixed to the insertion post 30. The width of the inner wall of the positioning groove 320 is adapted to the width of the outer wall of the positioning block 210.

[0049] In the present utility model, the positioning block 210 and the positioning groove 320 are inserted and cooperated to increase the installation stability between the insertion post 30 and the top cover 2. Among them, an anti-inversion hopper 301 is also provided in the ventilation hole 300. With the cooperation of the anti-inversion hopper 301, the influence of internal liquid flowing out along the inner wall of the insertion post 30 is reduced.

[0050] Further, several anti-slip columns 33 are provided on the outer wall of the safety valve body 3 near the top. The anti-slip columns 33 are distributed at equal intervals in a ring shape, and the anti-slip columns 33 and the safety valve body 3 are integrally formed. A vent hole 35 communicating with the inside is opened on the outer wall of the safety valve body 3 near the bottom. The vent holes 35 are distributed at equal intervals in a ring shape.

[0051] In the present utility model, with the cooperation of multiple anti-slip columns 33, the contact area is increased, thereby increasing the friction force. With the cooperation of multiple vent holes 35, it helps the internal exhaust and pressure reduction of the safety valve body 3.

[0052] When the explosion-proof safety valve for a battery in this embodiment is in use, the user first combines and connects the limit ring 20 with the top cover 2, and fixes the positioning block 210 and the ventilation groove 21 together. Then, combines and fixes the plug post 30 with the anti-tipping bucket 301 with the safety valve body 3. The sealing plug 34 with the convex pad 341 is combined and fixed with the safety valve body 3 through the spring 340. A plurality of vent holes 35 are opened on the outer wall of the safety valve body 3, and then combines and fixes the top cover 2 with the corresponding lithium battery body 1.

[0053] When it is necessary to inject liquid into the lithium battery body 1, with the cooperation of the anti-slip columns 33, the safety valve body 3 is taken out from the top cover 2, and the injection is carried out through the ventilation groove 21. After the injection is completed, the safety valve body 3 is inserted and matched with the positioning block 210 through the clamping post 32, realizing the insertion and installation cooperation between the safety valve body 3 and the top cover 2. The sealing gasket 31 is in close contact with the top cover 2, increasing the stability of the combination and the airtightness. When the internal pressure of the lithium battery body 1 is greater than the deformation value of the spring 340, the air pressure squeezes the sealing plug 34 with the convex pad 341 to move upward, and the internal gas passes through the round groove 303, through the through hole 304 and is discharged from the vent hole 35, realizing the pressure reduction cooperation. The overall combination is convenient to install and is convenient for quick installation cooperation.

Claims

1. An explosion-proof safety valve for a battery, comprising a lithium battery body (1), a top cover (2) being provided on the top of the lithium battery body (1), a venting groove (21) being provided in the middle of the top cover (2), a safety valve body (3) being provided in the venting groove (21), and characterized in that: A limiting ring (20) is provided on the upper surface of the top cover (2) near the ventilation groove (21); a positioning block (210) is symmetrically provided at the top of the inner wall of the ventilation groove (21); a plug post (30) is provided at the bottom of the safety valve body (3); a ventilation hole (300) is provided in the middle of the plug post (30); a clamping column (32) is provided on the outer wall of the plug post (30) at a position corresponding to the positioning block (210); a positioning groove (320) is provided at the same end of the clamping column (32); a fixing ring (302) is provided on the outer wall of the plug post (30); and a sealing gasket (31) is provided at the bottom of the fixing ring (302).

2. The explosion-proof safety valve for a battery according to claim 1, characterized in that: The width of the outer wall of the top cover (2) matches the width of the outer wall of the lithium battery body (1), and the top cover (2) is bonded and fixed to the lithium battery body (1).

3. The explosion-proof safety valve for a battery according to claim 1, characterized in that: The top of the plug post (30) is welded and fixed to the safety valve body (3); a circular groove (303) is provided on the top of the plug post (30); a sealing plug (34) is provided in the circular groove (303); a spring (340) is provided on the top of the sealing plug (34); one end of the spring (340) is bonded and fixed to the top of the sealing plug (34); and the other end of the spring (340) is bonded and fixed to the safety valve body (3).

4. The explosion-proof safety valve for a battery according to claim 3, characterized in that: A through hole (304) communicating with the inside of the circular groove (303) is provided on the outer wall of the plug post (30) near the top.

5. The explosion-proof safety valve for a battery according to claim 3, characterized in that: The outer diameter of the sealing plug (34) is matched with the inner diameter of the circular groove (303); a convex pad (341) is provided at the bottom of the sealing plug (34); the top of the convex pad (341) is bonded and fixed to the bottom of the sealing plug (34); and the outer diameter of the convex pad (341) is matched with the inner diameter of the vent hole (300).

6. The explosion-proof safety valve for a battery according to claim 1, characterized in that: The inner wall of the fixing ring (302) is bonded and fixed to the outer wall of the plug post (30), the top of the sealing gasket (31) is bonded and fixed to the bottom of the fixing ring (302), the outer diameter of the sealing gasket (31) is matched with the inner diameter of the limiting ring (20), and the outer diameter of the sealing gasket (31) is smaller than the inner diameter of the safety valve body (3).

7. The explosion-proof safety valve for a battery according to claim 1, characterized in that: The positioning block (210) is in the shape of an arc plate, the positioning block (210) is bonded and fixed to the plug post (30), the clamping post (32) is bonded and fixed to the plug post (30), and the width of the inner wall of the positioning groove (320) is matched with the width of the outer wall of the positioning block (210).

8. The explosion-proof safety valve for a battery according to claim 1, characterized in that: A plurality of anti-skid columns (33) are arranged on the outer wall of the safety valve body (3) near the top, the anti-skid columns (33) are arranged in a circular shape with equal spacing, and the anti-skid columns (33) and the safety valve body (3) are an integrally formed structure. An air leakage hole (35) communicating with the interior is opened on the outer wall of the safety valve body (3) near the bottom, and the air leakage holes (35) are arranged in a circular shape with equal spacing.

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