Explosion-proof cover plate of lithium battery

Abstract

The utility model discloses a lithium battery explosion-proof cover plate which comprises a cover body, an airtight cylinder is arranged on the surface, close to a lithium battery, of the cover body, at least one explosion-proof opening is formed in the surface of the cover body and located on the outer side of the airtight cylinder, and an extrusion plug is arranged at the end, away from the cover body, of the airtight cylinder. The periphery of the extrusion plug is connected with the inner wall of the airtight cylinder in a sliding manner, and an expansion sheet which is linked with the extrusion plug and is used for opening or closing the explosion-proof opening is arranged at one end, far away from the extrusion plug, of the airtight cylinder. When the cover plate is used, pressure is applied to the extrusion plug through air pressure, the two expansion pieces are extruded and moved through the extrusion assembly, so that the explosion-proof opening and the overlapping opening are overlapped, internal air pressure is exhausted, the two expansion pieces are pulled to be reset and sealed again through the elastic pieces after exhausting, the cover plate can be used repeatedly, and the safety of the cover plate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to an explosion-proof cover plate for a lithium battery. Background Art

[0002] A battery cover is a protective component covering the battery, typically made of plastic or metal. Its primary function is to protect the battery from damage caused by the external environment and other potential factors. It also prevents short circuits between the positive and negative electrodes. Cylindrical batteries are increasingly being used, and large cylindrical batteries with steel casings have become a key next-generation technology for battery companies due to their superior performance, increased safety, and lower costs.

[0003] Generally, in actual use of lithium-ion battery covers, when pressure is generated inside the battery during use, the rupture groove will crack. However, once cracked, the inside of the battery will not be sealed. If not discovered in time, the battery may become damp or water may enter the inside during subsequent use, which may lead to a short circuit and cause a safety hazard. Utility Model Content

[0004] The purpose of the present invention is to provide an explosion-proof cover for a lithium battery to solve the problems raised in the above-mentioned background technology.

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

[0006] A lithium battery explosion-proof cover plate includes a cover body, an airtight cylinder is provided on the surface of the cover body close to the lithium battery, at least one explosion-proof opening is provided on the surface of the cover body, and the explosion-proof opening is located on the outside of the airtight cylinder. An extrusion plug is provided at one end of the airtight cylinder away from the cover body, and the circumference of the extrusion plug is slidably connected to the inner wall of the airtight cylinder. An expansion piece is provided at one end of the airtight cylinder away from the extrusion plug, which is linked to the extrusion plug and is used to open or close the explosion-proof opening.

[0007] The air pressure inside the lithium battery pushes the extrusion plug to move in the airtight cylinder, and then the extrusion plug pushes the expansion piece to open the explosion-proof vent to prevent excessive air pressure inside the battery. When the air pressure recovers, the expansion piece closes the explosion-proof vent to ensure the sealing inside the battery.

[0008] As a further solution of the present invention: there are two explosion-proof openings, movable openings are opened on both sides of the airtight cylinder, there are two expansion plates and they are slidably connected to the two movable openings respectively, and the two expansion plates are arranged in coordination with the two explosion-proof openings.

[0009] By setting up two explosion-proof vents, the performance of instantaneous exhaust and pressure relief can be increased and the exhaust and pressure relief time can be reduced.

[0010] As a further solution of the present invention: an overlapping opening is provided on the expansion piece, and the overlapping opening is located at one end close to the explosion-proof opening.

[0011] The explosion-proof vent is opened by partially or completely overlapping the overlapping port with the explosion-proof vent, thereby venting and releasing the pressure of the battery.

[0012] As a further solution of the present invention: the cover body is provided with an air inlet connected to the airtight cylinder.

[0013] By arranging the air inlet connected to the airtight cylinder, the resistance of the extrusion plug moving in the airtight cylinder can be reduced.

[0014] As a further solution of the present invention: one end of the expansion piece located in the airtight cylinder is connected to the cover body through an elastic piece, and one end of the expansion piece located in the airtight cylinder is a slope structure, and an extrusion component that cooperates with the slope is provided in the extrusion plug.

[0015] The expansion piece is driven to reset by the elastic piece, and the movement of the extrusion plug is diverted by the slope and the extrusion assembly, thereby driving the expansion piece to move horizontally to open or close the explosion-proof port.

[0016] As a further solution of the present invention: the extrusion assembly includes a U-shaped frame fixedly connected to the lower end of the extrusion plug and an extrusion roller connected to the U-shaped frame, and the extrusion roller rests on the slope of the expansion piece.

[0017] By arranging a squeezing roller, the squeezing roller is squeezed onto the slope, which can push the expansion sheet to move horizontally.

[0018] As a further solution of the present invention: a sliding groove is provided on the inner wall of the airtight cylinder, a movable block is slidably connected in the sliding groove, the extrusion plug is connected to the movable block and is slidably connected to the inner wall of the airtight cylinder through the movable block and the sliding groove.

[0019] The movement of the extrusion plug can be guided by arranging the sliding groove and the movable block, thereby ensuring the stability of the movement of the extrusion plug.

[0020] As a further solution of the present invention: a breaking piece is fixedly connected to the expansion piece, and the breaking piece is located inside the explosion-proof opening.

[0021] The battery can be manually deflated and pressure-released by providing a break piece.

[0022] As a further solution of the present invention: a sealing gasket is provided at the position where the expansion piece is slidably connected to the cover body, and the sealing gasket is adhesively connected to the expansion piece.

[0023] The sealing performance of the movable opening and explosion-proof opening is improved by using sealing gaskets.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention sets an extrusion plug, and when a strong air pressure is generated inside the cylindrical battery, the air pressure exerts pressure on the extrusion plug, and the two expansion plates are squeezed and moved by the extrusion assembly, so that the explosion-proof port and the overlapping port overlap, thereby realizing the discharge of the internal air pressure. After the discharge, the two expansion plates are pulled back to their original position by the elastic plate and resealed, which can be used multiple times and can reduce the possibility of short circuit caused by erosion by moisture and rainwater due to failure to discover the rupture in time, thereby improving the safety of the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the three-dimensional structure of the embodiment;

[0026] Figure 2 This is a schematic diagram of the bottom structure of the cover body of the embodiment;

[0027] Figure 3 Schematic diagram of the cross-sectional three-dimensional structure of the cover body of the embodiment;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of the airtight cylinder of the embodiment;

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1. Cover; 2. Airtight cylinder; 3. Extrusion plug; 4. Movable port; 5. Expansion plate; 6. Elastic plate; 7. Extrusion assembly; 701. U-shaped frame; 702. Extrusion roller; 8. Explosion-proof port; 9. Overlapping port; 10. Sliding groove; 11. Movable block; 12. Prying plate; 13. Air inlet; 14. Sealing gasket. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] See also Figure 1-4 In an embodiment of the present invention, a lithium battery explosion-proof cover plate includes a cover body 1, an airtight cylinder 2 is fixedly connected to one side of the inner wall of the cover body 1, and an extrusion plug 3 is slidably fitted on the inner wall of the airtight cylinder 2. In this embodiment, the cover body 1, the airtight cylinder 2, and the extrusion plug 3 are all cylindrical structures, which are mainly used in cylindrical batteries.

[0034] There are movable openings 4 on both sides of the airtight cylinder 2, and the inner walls of the two movable openings 4 are slidably fitted with expansion pieces 5. An elastic piece 6 is installed between the two expansion pieces 5 and the cover body 1, and an extrusion assembly 7 is installed on the lower side of the extrusion plug 3. There are two explosion-proof openings 8 on the cover body 1, and two overlapping openings 9 are opened on one side of the expansion piece 5. One side of the two expansion pieces 5 is fixedly connected to two bend pieces 12, and the two bend pieces 12 are respectively located inside the two explosion-proof openings 8. When the cover body 1 is installed in the cylindrical lithium battery shell, if there is a certain air pressure inside, the bend piece 12 can be lifted by a tool, and the explosion-proof opening 8 and the overlapping opening 9 can be operated from the outside to discharge the internal air pressure.

[0035] When in use, the cover 1 first needs to be installed on the cylindrical lithium battery shell for connection. When the air pressure is generated inside the battery due to use, the extrusion plug 3 in the airtight cylinder 2 will be squeezed. When the pressure value exceeds the pressure of the two elastic sheets 6, pressure will be applied to the extrusion plug 3 to make it move inside the airtight cylinder 2. The two expansion sheets 5 are squeezed toward both sides by the extrusion assembly 7, so that the overlapping openings 9 opened on the two expansion sheets 5 overlap with the explosion-proof opening 8, thereby exhausting the gas inside the battery and improving safety.

[0036] When the air pressure recovers to a certain level, it is restored through the two elastic sheets 6, driving the two expansion sheets 5 to reset. After the reset is completed, the explosion-proof opening 8 overlaps with the two expansion sheets 5 to be sealed, so that in actual use, the air pressure can be discharged to achieve explosion-proof. After the air pressure is discharged, the explosion-proof opening 8 can be sealed, reducing the possibility of short circuit caused by erosion by moisture and rainwater due to failure to detect the air pressure after discharge, thereby improving the safety of the cover.

[0037] The extrusion assembly 7 includes two U-shaped frames 701 fixedly connected to the lower side of the extrusion plug 3, and an extrusion roller 702 rotatably fitted on the inner wall of the two U-shaped frames 701 and in contact with the expansion piece 5. When the extrusion plug 3 is squeezed downward, the extrusion rollers 702 in the two U-shaped frames 701 are driven to squeeze the expansion piece 5, causing the expansion piece 5 to shift. When there is no air pressure inside, the two elastic sheets 6 are reset to squeeze the extrusion rollers 702, thereby achieving reverse force to reset the extrusion plug 3.

[0038] A sliding groove 10 is provided on one side of the inner wall of the airtight cylinder 2, and the inner wall of the sliding groove 10 is slidably fitted with a movable block 11 fixedly connected to the extrusion plug 3. When the extrusion plug 3 moves, the movable block 11 moves in the sliding groove 10, thereby limiting and guiding the extrusion plug 3.

[0039] An air inlet 13 is provided on one side of the cover body 1 . The air inlet 13 is located inside the airtight cylinder 2 . The air inlet 13 is used to take air into the airtight cylinder 2 to prevent the extrusion plug 3 from being unable to move inside the airtight cylinder 2 .

[0040] The upper sides of the two expansion pieces 5 are inclined, and the cover body 1 has undergone an anti-corrosion treatment. The inclination of the expansion pieces 5 is actually to allow the expansion pieces 5 to move when squeezed by the squeezing roller 702. The anti-corrosion treatment can be electroplating, hot-dip galvanizing, spray plating, etc., to reduce the possibility of corrosion. The lower sides of the two expansion pieces 5 are equipped with sealing gaskets 14. The sealing gaskets 14 and the expansion pieces 5 are bonded to each other with waterproof glue. The sealing gasket 14 is located between the two expansion pieces 5 inside the box cover body 1. When the expansion piece 5 blocks the explosion-proof opening 8, the sealing gasket 14 increases the sealing performance.

[0041] Example 2

[0042] In this embodiment, the cover 1, the airtight cylinder 2, and the extrusion plug 3 are all rectangular structures, which are mainly used in square batteries. The remaining structures and working processes are similar to those of Example 1.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0044] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A lithium battery explosion-proof cover, comprising a cover body (1), characterized in that: An airtight cylinder (2) is provided on the surface of the cover body (1) close to the lithium battery, and at least one explosion-proof opening (8) is provided on the surface of the cover body (1). The explosion-proof opening (8) is located outside the airtight cylinder (2). An extrusion plug (3) is provided on one end of the airtight cylinder (2) away from the cover body (1). The circumference of the extrusion plug (3) is slidably connected to the inner wall of the airtight cylinder (2). An expansion piece (5) is provided on the end of the airtight cylinder (2) away from the extrusion plug (3) and is linked to the extrusion plug (3) for opening or closing the explosion-proof opening (8).

2. The lithium battery explosion-proof cover according to claim 1, characterized in that: There are two explosion-proof openings (8), movable openings (4) are provided on both sides of the airtight cylinder (2), two expansion pieces (5) are provided and are respectively slidably connected to the two movable openings (4), and the two expansion pieces (5) are arranged in coordination with the two explosion-proof openings (8).

3. The lithium battery explosion-proof cover according to claim 1, characterized in that: The expansion piece (5) is provided with an overlapping opening (9), and the overlapping opening (9) is located at one end close to the explosion-proof opening (8).

4. The lithium battery explosion-proof cover according to claim 1, characterized in that: The cover body (1) is provided with an air inlet (13) communicating with the airtight cylinder (2).

5. The lithium battery explosion-proof cover according to claim 1, characterized in that: One end of the expansion piece (5) located in the airtight cylinder (2) is connected to the cover body (1) via an elastic piece (6); one end of the expansion piece (5) located in the airtight cylinder (2) is a slope structure; an extrusion assembly (7) that cooperates with the slope is provided in the extrusion plug (3).

6. The lithium battery explosion-proof cover according to claim 5, characterized in that: The extrusion assembly (7) comprises a U-shaped frame (701) fixedly connected to the lower end of the extrusion plug (3) and an extrusion roller (702) connected to the U-shaped frame (701), wherein the extrusion roller (702) rests on the slope of the expansion piece (5).

7. The lithium battery explosion-proof cover according to claim 1, characterized in that: The inner wall of the airtight cylinder (2) is provided with a sliding groove (10), a movable block (11) is slidably connected in the sliding groove (10), and the extrusion plug (3) is connected to the movable block (11) and is slidably connected to the inner wall of the airtight cylinder (2) through the movable block (11) and the sliding groove (10).

8. The lithium battery explosion-proof cover according to claim 1, characterized in that: A breaking piece (12) is fixedly connected to the expansion piece (5), and the breaking piece (12) is located inside the explosion-proof opening (8).

9. The lithium battery explosion-proof cover according to claim 1, characterized in that: A sealing gasket (14) is provided at the position where the expansion piece (5) is slidably connected to the cover body (1), and the sealing gasket (14) is adhesively connected to the expansion piece (5).

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