CN221150236U

CN221150236U - Explosion-proof structure, cover plate assembly and battery

Info

Publication number: CN221150236U
Application number: CN202323000643.XU
Authority: CN
Inventors: 李华伟; 陈伟; 丁春祥
Original assignee: Shenghong Energy Technology Taizhou Co ltd
Current assignee: Shenghong Energy Technology Taizhou Co ltd
Priority date: 2023-11-07
Filing date: 2023-11-07
Publication date: 2024-06-14
Anticipated expiration: 2033-11-07

Abstract

The utility model discloses an explosion-proof structure, which is arranged on a cover plate of a battery, wherein a positive pole and a negative pole are arranged on the cover plate in a penetrating way, the explosion-proof structure comprises explosion-proof holes communicated with a first side and a second side opposite to the cover plate, an explosion-proof piece arranged on the second side of the cover plate and used for sealing the explosion-proof holes, a boss arranged on the first side of the cover plate and surrounding the explosion-proof holes, and a protective film opposite to the explosion-proof holes is attached to one side of the boss opposite to the explosion-proof piece; the boss is provided with a first area opposite to the positive pole, a second area opposite to the negative pole, a third area positioned between the first area and the second area, and at least one first notch is arranged in at least the second area and/or the third area and is communicated with the explosion-proof hole and the outside of the battery; also disclosed are a cap plate assembly and a battery having the above explosion-proof structure.

Description

Explosion-proof structure, cover plate assembly and battery

Technical Field

The utility model relates to the field of batteries, in particular to an explosion-proof structure, a cover plate assembly and a battery.

Background

In the use process of the battery, when the temperature or the pressure in the battery is too high, chemical reaction occurs in the battery to generate gas, so that the pressure in the battery is continuously increased, the pressure in the battery is further caused to be too high, and the explosion of the battery is easily caused. In order to avoid the occurrence of the above, an explosion-proof structure is provided on the battery.

The explosion-proof structure typically includes explosion-proof holes provided on the battery cover plate, and explosion-proof sheets sealing the explosion-proof holes. When the pressure in the battery suddenly increases or the temperature rapidly rises, the explosion-proof piece is opened, so that high-pressure gas in the battery can be emitted to the outside, and the explosion of the battery is avoided. After the explosion-proof valve is opened, high-pressure gas diffuses in all directions, and in the use process of the battery, the position of the pole is a position with relatively high temperature of the battery, and the high-pressure gas meets the high Wen Jizhu, so that the explosion is easily caused by fire.

Disclosure of Invention

In order to overcome the defects in the prior art, the embodiment of the utility model provides an explosion-proof structure, a cover plate assembly and a battery, wherein the explosion-proof structure can guide gas emitted from an explosion-proof hole, avoid the gas from meeting a high-temperature pole, and further avoid explosion of the battery.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

In a first aspect, an explosion-proof structure is disposed on a cover plate of a battery, a post is further penetrated through the cover plate, the explosion-proof structure includes an explosion-proof hole communicating a first side and a second side opposite to the cover plate, an explosion-proof sheet disposed on the second side of the cover plate for sealing the explosion-proof hole, a boss disposed on the first side of the cover plate and surrounding the explosion-proof hole, and a protective film opposite to the explosion-proof hole is attached to one side of the boss opposite to the explosion-proof sheet; at least one first notch is arranged on the boss, and the extension area of the first notch is staggered with the pole.

The first notch is arranged on the boss by surrounding the explosion-proof hole. When the explosion-proof sheet is burst and opened due to the fact that the pressure in the battery is too high, the outward-diffused gas preferentially flows to the first notch due to the fact that the pressure in the first notch is relatively low, and therefore the outward-diffused gas can be guided at the moment of outward diffusion. And the extending area of the first notch is staggered with the pole, so that gas can be guided to an area avoiding the pole, and the high-pressure gas and the high-temperature pole are prevented from meeting, and the ignition of the battery is prevented.

The cutting angle when the boss is cut to form the first notch is adjusted, so that the extending direction of the first notch is changed, and the gas is prevented from being guided to the pole.

Preferably, the explosion-proof hole is arranged between the positive pole and the negative pole, and the positive pole, the explosion-proof hole and the negative pole are arranged along the first direction. The boss is provided with a first area opposite to the positive pole column along the first direction, a second area opposite to the negative pole column along the first direction, two third areas which are arranged between the first area and the second area and are opposite to each other, and at least one first notch is arranged in the third areas.

In a square battery, the explosion-proof hole is generally provided in the middle region of the cover sheet, and positive and negative electrode posts are provided on both sides of the explosion-proof hole along the longitudinal direction of the cover sheet. The projection area formed on the boss by the positive pole post along the length direction is a first area, the projection area formed on the boss by the negative pole post along the length direction is a second area, the first area and the second area are oppositely arranged, and a third area is arranged between the first area and the second area. The first notch is arranged in the third area, so that the gas which is diffused outwards at the moment of opening the explosion-proof piece can avoid the polar column, and the high-pressure gas is prevented from meeting the height Wen Jizhu. When the battery is in use, the temperature of the positive electrode column is higher than that of the negative electrode column. Therefore, the possibility that the anode post and the gas meet each other is relatively low, and the first notch may be arranged in the second area.

It is further preferred that at least one of the first notches is provided in each of the two opposing third regions. Through increasing the quantity of first breach, can improve gas vector in the moment that the explosion-proof piece opened, reduce the nearby atmospheric pressure of explosion-proof hole fast.

Further preferably, at least two first notches are oppositely arranged in the two third areas, and the extending direction of the first notches is perpendicular to the first direction.

Preferably, a second notch opposite to the first notch is provided on the protective film. The second notch is arranged, so that the conduction area between the explosion-proof hole and the outside is further enlarged, and the gas quantity diffused from the notch at the moment of opening the explosion-proof piece is improved. And the second notch is opposite to the first notch, namely, the second notch is arranged at the periphery of the explosion-proof hole, so that the explosion-proof piece opposite to the explosion-proof hole can still be protected.

Preferably, a step part is arranged on the second side of the cover plate around the explosion-proof hole, and the explosion-proof sheet sealing cover is arranged on the step part.

Preferably, the middle part of the explosion-proof sheet is provided with a reinforcing structure, the reinforcing structure comprises a first reinforcing rib arranged in the middle of the explosion-proof sheet along the length direction of the first reinforcing rib, and the reinforcing structure is connected with two opposite sides of the width direction of the explosion-proof sheet and a second reinforcing rib connected with the end part of the first reinforcing rib. The strength of the middle part of the rupture disc is relatively low in the whole rupture disc. The middle part of the explosion-proof piece is provided with a plurality of reinforcing ribs to form a reinforcing structure, so that the opening pressure of each part of the explosion-proof piece can be balanced.

The second aspect, a apron subassembly with above-mentioned explosion-proof structure, including the cover plate, set up in explosion-proof structure on the cover plate runs through the through-hole of cover plate, connect in on the cover plate and encircle the anti-rotating ring that the through-hole set up, set up in post in the through-hole connects the post with the plastic part of cover plate, just prevent rotating in the intra-annular in the plastic part.

During product processing, the anti-rotation ring can be processed independently, and then the processed anti-rotation ring is fixed on the cover plate. The design of independent anti-swivel not only can improve the joint strength of plastic part and cover plate, but also is convenient for the replacement and processing of anti-swivel shape.

Preferably, the anti-rotation ring comprises a ring body welded and connected with the cover plate, and a plurality of protrusions are arranged on one side of the ring body opposite to the cover plate and can be arranged at equal intervals along the anti-rotation ring.

In a third aspect, a battery with the explosion-proof structure includes a housing, a battery cell disposed in the housing, and a cover plate assembly sealing an opening of the housing, the cover plate assembly including a cover plate, and the explosion-proof structure, the positive electrode column and the negative electrode column disposed on the cover plate.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. Through setting up the boss around the explosion vent, set up the first breach of avoiding the utmost point post direction on the boss, in explosion-proof piece opening in the twinkling of an eye, first breach can be to the gaseous formation direction in the explosion-proof vent, makes explosion-proof piece opening the instantaneous high-pressure gas avoid the utmost point post direction, avoids high-pressure gas and high temperature utmost point post to meet, avoids the battery to strike a fire.

2. The cover plate is provided with an anti-rotation ring surrounding the through hole, and the anti-rotation ring is embedded in the plastic part when the cover plate assembly is in a combined state, so that the connection strength of the plastic part and the cover plate is improved. And the anti-rotation ring which is independently designed is convenient for the replacement and processing of the shape.

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded schematic view of an explosion-proof structure in an embodiment of the present utility model;

FIG. 2 is a schematic view of a cover sheet according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of a protective film according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the structure of the rupture disc according to the embodiment of the present utility model;

FIG. 5 is an exploded view of a cover plate assembly according to an embodiment of the present utility model;

FIG. 6 is a schematic view of an anti-rotation ring according to an embodiment of the present utility model.

Reference numerals of the above drawings: 1. a cover plate; 11. a through hole; 21. explosion-proof holes; 22. a boss; 221. a first notch; 23. a protective film; 231. a second notch; 24. explosion-proof sheet; 241. a reinforcing structure; 3. an anti-rotation ring; 31. a circular ring body; 32. a protrusion; 4. a pole; 5. a plastic part; 6. a plastic mat.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiment one: referring to fig. 1, an explosion-proof structure is disposed on a cover plate 1 of a battery, two through holes 11 are formed on two sides of the cover plate 1 in a length direction, and the two through holes 11 are respectively used for accommodating a positive electrode post 4 and a negative electrode post 4. The explosion-proof structure comprises an explosion-proof hole 21 communicated with a first side and a second side opposite to the cover plate 1, an explosion-proof sheet 24 arranged on the second side of the cover plate 1 and used for sealing the explosion-proof hole 21, a boss 22 arranged on the first side of the cover plate 1 and surrounding the explosion-proof hole 21, a protective film 23 opposite to the explosion-proof hole 21 attached to one side of the boss 22 opposite to the explosion-proof sheet 24, and at least one first notch 221 arranged on the boss 22, wherein the extending area of the first notch 221 is staggered with the pole 4. That is, when the two side surfaces of the boss 22, in which the first notch 221 is formed, are extended toward the pole 4, the region between the two side surfaces is an extended region, and the extended region does not overlap with the pole 4.

In an alternative embodiment, as shown in fig. 2, the cross section of the boss 22 is waist-shaped, and the boss 22 extends along the width direction of the cover plate 1. The length of the boss 22 is greater than the diameter of the pole 4. The projection area of the positive electrode post 4 formed on the boss 22 is set as a first area along the length direction of the cover sheet 1. The projection area of the anode post 4 formed on the boss 22 is taken as a second area along the length direction of the cover plate 1. And the two sides of the boss 22 in the length direction are positioned between the first area and the second area to be used as a third area. Two first notches 221 are respectively provided in the two third areas, and the two first notches 221 on two sides are oppositely arranged along the width direction of the cover plate 1.

Referring to fig. 3, the protective film 23 is provided with a second notch 231 opposite to the first notch 221. The second notch 231 is provided to further enlarge the conducting area between the explosion-proof hole 21 and the outside, and improve the gas quantity diffused from the notch at the moment when the explosion-proof piece 24 is opened. And the second notch 231 is opposite to the first notch 221, that is, the second notch 231 is disposed at the periphery of the explosion proof hole 21, so that the explosion proof piece 24 opposite to the explosion proof hole 21 can still be protected.

In an alternative embodiment, a step is provided around the explosion proof aperture 21 on the second side of the cover plate 1, and the explosion proof plate 24 seals against the step. Referring to fig. 4, a reinforcing structure 241 is disposed in the middle of the explosion-proof sheet 24, and the reinforcing structure 241 includes a first reinforcing rib disposed in the middle of the explosion-proof sheet 24 along the length direction thereof, and a second reinforcing rib connected to opposite sides of the explosion-proof sheet 24 in the width direction and connected to the ends of the first reinforcing rib.

Referring to fig. 5 and 6, a cover plate assembly having the above explosion-proof structure, the cover plate assembly comprises:

The cover plate 1 is provided with a first side and a second side which are opposite along the thickness direction of the cover plate 1, through holes 11 are respectively formed in two sides of the length direction of the cover plate 1, and an explosion-proof structure is arranged between the two through holes 11;

The anti-rotation ring 3 is arranged on the first side of the cover plate 1 and surrounds the first through hole 11, the anti-rotation ring 3 comprises a circular ring body 31 welded with the cover plate 1, and a plurality of protrusions 32 arranged on the side, opposite to the cover plate 1, of the circular ring body 31;

The pole 4 comprises a positive pole 4 and a negative pole 4, the pole 4 is arranged in the through hole 11, and one end of the pole 4 extends to one side of the anti-rotation ring 3, which is away from the cover plate 1;

The plastic part 5 is arranged on the cover plate 1 and wraps the periphery of the pole 4, and the anti-rotation ring 3 is embedded in the plastic part;

and the plastic pad 6 is fixedly connected to the second side of the cover plate 1.

The battery with the explosion-proof structure comprises a shell, a battery core arranged in the shell, and a cover plate assembly sealing an opening of the shell, wherein the cover plate assembly comprises a cover plate 1, and the explosion-proof structure, a positive pole column 4 and a negative pole column 4 are arranged on the cover plate 1.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims

1. The explosion-proof structure is arranged on a cover plate of the battery, and a pole post is arranged on the cover plate in a penetrating manner, and is characterized by comprising an explosion-proof hole communicated with a first side and a second side opposite to the cover plate, an explosion-proof piece arranged on the second side of the cover plate and used for sealing the explosion-proof hole, a boss arranged on the first side of the cover plate and surrounding the explosion-proof hole, and a protective film opposite to the explosion-proof hole is attached to one side of the boss opposite to the explosion-proof piece; at least one first notch is arranged on the boss, and the extension area of the first notch is staggered with the pole.

2. The explosion-proof structure according to claim 1, wherein the explosion-proof hole is disposed between the positive electrode post and the negative electrode post, the positive electrode post, the explosion-proof hole and the negative electrode post are arranged along a first direction, the boss has a first area opposite to the positive electrode post along the first direction, a second area opposite to the negative electrode post along the first direction, two third areas disposed between the first area and the second area and opposite to each other, and at least one first notch is disposed in the third area.

3. The explosion-proof structure according to claim 2, wherein at least one of the first notches is provided in each of the two opposing third regions.

4. The explosion-proof structure according to claim 2, wherein at least two first notches are oppositely arranged in the two third areas, and the extending direction of the first notches is perpendicular to the first direction.

5. The explosion-proof structure according to claim 1, wherein a second notch opposite to the first notch is provided on the protective film.

6. The explosion proof structure of claim 1, wherein a step is provided around the explosion proof hole on the second side of the cover sheet, and the explosion proof sheet sealing cover is provided on the step.

7. The explosion-proof structure according to claim 1, wherein the middle part of the explosion-proof sheet is provided with a reinforcing structure, the reinforcing structure comprises a first reinforcing rib arranged in the middle of the explosion-proof sheet along the length direction thereof, and a second reinforcing rib connected with two opposite sides of the width direction of the explosion-proof sheet and connected with the end parts of the first reinforcing rib.

8. A cover plate assembly having an explosion-proof structure according to any one of claims 1 to 7, comprising a cover plate, an explosion-proof structure provided on the cover plate, a through hole penetrating the cover plate, an anti-rotation ring connected to the cover plate and surrounding the through hole, a pole provided in the through hole, a plastic member connecting the pole and the cover plate, and the anti-rotation ring embedded in the plastic member.

9. The cover plate assembly of claim 8, wherein the anti-rotation ring comprises a ring body welded to the cover plate and a plurality of protrusions disposed on a side of the ring body facing away from the cover plate.

10. A battery having an explosion-proof structure as claimed in any one of claims 1 to 7, wherein the battery comprises a case, a battery cell provided in the case, a cap plate assembly sealing an opening of the case, the cap plate assembly including a cap plate, the explosion-proof structure, a positive electrode post and a negative electrode post provided on the cap plate.