CN209981340U

CN209981340U - Explosion-proof valve and secondary battery top cover with same

Info

Publication number: CN209981340U
Application number: CN201920084792.3U
Authority: CN
Inventors: 胡明江; 李升高; 夏天军; 戴亨伟
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2019-01-18
Filing date: 2019-01-18
Publication date: 2020-01-21
Anticipated expiration: 2029-01-18

Abstract

The utility model provides an explosion-proof valve, which comprises an explosion-proof valve ring, an explosion-proof valve cover, reinforcing ribs and nicks, wherein the inner side of the explosion-proof valve ring is fixedly connected with the explosion-proof valve cover, the reinforcing ribs comprise a first reinforcing rib, a second reinforcing rib, a third reinforcing rib, a fourth reinforcing rib, a fifth reinforcing rib and a sixth reinforcing rib, and are all arranged on the explosion-proof valve cover, the nicks comprise a first nick and a second nick, are arranged on the annular curve part on the explosion-proof valve cover, have the same shape with the annular curve part, compared with the prior art, the nicks thinner than other parts are arranged on the explosion-proof valve cover, when an electricity core is abnormal, gas generated in the electricity core firstly rushes out the nick area to achieve the purpose of pressure relief, so that the whole explosion-proof valve can not be completely rushed out to separate from a top cover plate, thereby avoiding the damage to other parts, and compared with the, the explosion-proof valve can be further prevented from being damaged, deformed or broken and the service life is prolonged.

Description

Explosion-proof valve and secondary battery top cover with same

Technical Field

The utility model relates to a power battery technical field, more specifically say, relate to an explosion-proof valve and have secondary battery top cap of this explosion-proof valve.

Background

In the prior art, in order to ensure the safety of a power battery, an explosion-proof valve is generally arranged on a top cover of the power battery, when the battery is charged improperly, short-circuited or abused, a large amount of gas is generated by the battery, the temperature of the battery is also increased rapidly, and at the moment, the gas rushes the explosion-proof valve to release the pressure, so that the safety of the battery is ensured. The simplest existing lithium ion battery top cover comprises a top cover plate, a positive pole and a negative pole, wherein the top cover plate is insulated by plastic, an explosion-proof sheet is arranged in the middle of the top cover plate, the explosion-proof sheet is a very shallow impression, the explosion-proof sheet is easy to damage and deform in the transportation and production processes and is easy to break in a breath test, Chinese patent CN107331821A discloses a lithium ion battery explosion-proof valve with a reinforcing rib to solve the problem, the lithium ion battery explosion-proof valve comprises an explosion-proof valve ring, an explosion-proof valve cover and the reinforcing rib, the reinforcing rib comprises a first reinforcing rib and a second reinforcing rib, the inner side of the explosion-proof valve ring is fixedly connected with the excellent explosion-proof valve cover, an annular groove with the same shape as the explosion-proof valve ring is arranged on the explosion-proof valve cover, the middle of the explosion-proof valve cover is provided with the first reinforcing rib and the second reinforcing rib, and the first reinforcing rib and the, the openings of the first reinforcing ribs and the second reinforcing ribs face opposite directions. Although the explosion-proof valve has certain advantages and can solve the problems, the explosion-proof valve cover is provided with the thin annular groove, when a battery core generates a large amount of gas and the temperature rises sharply, and the air pressure increases sharply, the annular groove part is easy to burst, so that the explosion-proof valve is completely flushed out and separated from the top cover, splashed out and even damages other components.

The invention content is as follows:

in order to solve the problems, the invention provides a method which can prevent an explosion-proof valve from being punched out to be separated from a top cover plate and prevent the explosion-proof valve from deforming or breaking in the using process.

The invention provides an explosion-proof valve which comprises an explosion-proof valve ring, an explosion-proof valve cover, reinforcing ribs and nicks, wherein the explosion-proof valve cover is fixedly connected to the inner side of the explosion-proof valve ring, the reinforcing ribs comprise a first reinforcing rib, a second reinforcing rib, a third reinforcing rib, a fourth reinforcing rib, a fifth reinforcing rib and a sixth reinforcing rib, the reinforcing ribs and the sixth reinforcing rib are arranged on the explosion-proof valve cover, the nicks comprise first nicks and second nicks, are arranged on an annular bend part on the explosion-proof valve cover, and are the same as the annular bend part in shape.

As a further improvement of the present invention, the first reinforcing rib and the second reinforcing rib are mutually crossed in an "X" shape or a "cross" shape, or may be arc-shaped or semicircular with openings facing opposite directions, the explosion-proof valve cover is divided into four parts, the third reinforcing rib, the fourth reinforcing rib, the fifth reinforcing rib and the sixth reinforcing rib are respectively distributed inside the four parts,

as a further improvement of the invention, the explosion-proof valve ring and the explosion-proof valve cover are round or runway-shaped;

as a further improvement of the invention, the third reinforcing rib, the fourth reinforcing rib, the fifth reinforcing rib and the sixth reinforcing rib are arc-shaped or ridge-shaped and are bent towards the center of the explosion-proof valve cover;

as a further improvement of the invention, the thickness of the score is thinner than other parts of the explosion-proof cover.

The invention also provides a secondary battery top cover with the explosion-proof valve, which comprises a top cover plate, a positive pole column unit, a negative pole column unit, a liquid injection hole and the explosion-proof valve.

Advantageous effects

Compared with the prior art, the anti-explosion valve provided by the invention has the advantages that the nicks thinner than other parts are arranged on the anti-explosion valve cover to replace the annular grooves, when the battery cell is abnormal, the internal temperature is increased rapidly, and the air pressure is increased rapidly, the gas generated in the battery cell firstly flushes the nick area to achieve the purpose of pressure relief, and the other parts are thicker, so that the whole anti-explosion valve is prevented from being flushed away completely from the top cover plate, the other parts are prevented from being damaged, and the reinforcing ribs arranged on the top cover plate can further prevent the anti-explosion valve from being damaged, deformed or broken and prolong the service life compared with the prior art.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of an explosion-proof valve

FIG. 2 is a cross-sectional view in the AA direction

FIG. 3 is a cross-sectional view taken in the direction BB

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like are used for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited in the art, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed connections, detachable connections, or integral connections, either direct connections or indirect connections through intervening media. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

For a better understanding of the present invention, the following describes embodiments of the present invention in detail with reference to fig. 1 to 3.

The invention provides an explosion-proof valve which comprises an explosion-proof valve ring 1, an explosion-proof valve cover 2, reinforcing ribs and nicks, wherein the inner side of the explosion-proof valve ring 1 is fixedly connected with the explosion-proof valve cover 2, an annular groove with the same shape as the explosion-proof valve ring 1 is arranged on the explosion-proof valve cover 2, the reinforcing ribs comprise a first reinforcing rib 31, a second reinforcing rib 32, a third reinforcing rib 33, a fourth reinforcing rib 34, a fifth reinforcing rib 35 and a sixth reinforcing rib 36, and the nicks comprise first nicks 41 and second nicks 42;

in the embodiment, the explosion-proof valve 10 is in a runway shape, and comprises a curved part and a straight part, wherein the notch is arranged on the curved part of the explosion-proof valve cover 2 and has the same shape as the curved part;

preferably, the first reinforcing rib 31 and the second reinforcing rib 32 are in the shape of a semicircle or an arc with opposite openings, so as to divide the explosion-proof valve cover 2 into a first part a, a second part b, a third part c and a fourth part d, and the third reinforcing rib 33, the fourth reinforcing rib 34, the fifth reinforcing rib 35 and the sixth reinforcing rib 36 are arranged inside the four parts and have the shape of a ridge protruding towards the center of the explosion-proof valve cover 2;

further, the reinforcing rib can be formed by stretching from the explosion-proof valve cover 2 or by extruding from the explosion-proof valve cover 2, and the reinforcing rib can enhance the strength and stability of the explosion-proof valve 10 and can not be damaged, deformed or broken in the transportation or production process;

in this embodiment, the thickness of the explosion-proof valve ring 1 is 0.5 ~ 1.5.5 mm, the thickness of the nick on the explosion-proof valve 10 is 0.05 ~ 0.2mm, the thickness of the other part on the explosion-proof valve cover 2 is 0.3 ~ 0.7mm, the thickness of the first reinforcing rib 31 and the second reinforcing rib 32 is 0.13 ~ 0.25mm, the thickness of the third reinforcing rib 33, the fourth reinforcing rib 34, the fifth reinforcing rib 35 and the sixth reinforcing rib 36 is 0.3 ~ 1mm, the thickness is the same as that of the explosion-proof valve cover 2, but 0.1 ~ 0.3.3 mm higher than the upper surface of the explosion-proof valve cover 2;

furthermore, the score is thinner than the straight channel 52, and when a large amount of gas generated inside the battery cell needs to be released, the score bursts at the position, and the straight channel 52 is thicker, so that the situation of bursting cannot occur, and the explosion-proof valve 10 is prevented from being rushed out to be separated from the top cover.

Further, the first reinforcing rib 31 and the second reinforcing rib 32 may have an X shape or a cross shape intersecting each other, in addition to the semicircular shape or the C shape in the present embodiment.

The invention also provides a secondary battery top cover with the explosion-proof valve 10, which comprises a top cover plate 11, a positive pole post unit 15, a negative pole post unit 16, a liquid injection hole 12 and the explosion-proof valve 10.

Claims

1. The utility model provides an explosion-proof valve, includes explosion-proof valve collar, explosion-proof valve gap, strengthening rib and nick, the explosion-proof valve gap of inboard fixedly connected with of explosion-proof valve collar, a serial communication port, the strengthening rib includes first strengthening rib, second strengthening rib, third strengthening rib, fourth strengthening rib, fifth reinforcing rib and sixth strengthening rib, and all set up in on the explosion-proof valve cap, the nick includes first nick and second nick, set up in annular bend part on the explosion-proof valve gap, and with the partial shape of annular bend is the same.

2. The explosion-proof valve as claimed in claim 1, wherein the explosion-proof valve ring and the explosion-proof valve cover are in a circular or racetrack structure.

3. An explosion proof valve as defined in claim 1 wherein the score is thinner in thickness than the remainder of the explosion proof valve cover.

4. The explosion-proof valve as recited in claim 1 wherein said first and second ribs are mutually intersecting "X" shaped, "cross" shaped or arc or semi-circular with openings facing in opposite directions, said first and second ribs dividing said explosion-proof valve cover into four sections.

5. The explosion-proof valve as claimed in claim 1, wherein the third, fourth, fifth and sixth ribs are respectively distributed inside the four parts.

6. The explosion-proof valve as claimed in claim 1, wherein the third, fourth, fifth and sixth ribs are formed in an arc shape or a ridge shape bent toward the center of the explosion-proof valve cover.

7. A secondary battery top cap having the explosion-proof valve is characterized by comprising a top cover plate, a positive electrode column unit, a negative electrode column unit, a liquid injection hole and the explosion-proof valve according to any one of claims 1 ~ 6.