CN217214904U

CN217214904U - Top cap, top cap subassembly and battery

Info

Publication number: CN217214904U
Application number: CN202220919296.7U
Authority: CN
Inventors: 刘峰; 奚明明; 兑瀚
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-08-16
Anticipated expiration: 2032-04-20

Abstract

The utility model belongs to the technical field of the battery, a top cap, top cap subassembly and battery are disclosed, this top cap sets up the step hole that is used for installing the explosion-proof piece on the top cap body, set up at the border in step hole and strengthen the step, should strengthen the circumference closed loop setting of step along the step hole, and the step face of strengthening the step is located one side in step hole, it has formed one deck additional strengthening at the border in step hole to strengthen the step, the structural strength in step hole has effectively been improved, and have the effect in protection step hole, and then effectively improved the structural strength of battery explosion-proof position.

Description

Top cap, top cap subassembly and battery

Technical Field

The utility model relates to a battery technology field especially relates to a top cap, top cap subassembly and battery.

Background

The lithium ion battery has the advantages of high capacity density, large specific energy, long cycle life and the like, so that the lithium ion battery becomes the preferred battery for energy storage of portable electronic products and electric vehicles and is more and more widely applied. In the process of charging and discharging, a large amount of gas is generated, the large amount of gas is accumulated inside the battery continuously, and if the gas is not discharged in time, the battery can explode.

In order to prevent the explosion of the battery, the prior art discloses a battery top cap, in which a stepped hole is formed in a top cap body, and an explosion-proof sheet is installed in the stepped hole to discharge a large amount of gas accumulated inside the battery to the outside of the battery.

However, the edge of the step hole formed in the top cover body is not provided with a reinforcing structure or a protection structure, so that the structural strength of the step hole is lower, and the structural strength of the explosion-proof position of the battery is further reduced. Therefore, it is desirable to provide a top cover to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a top cap has the technological effect that improves the step hole structural strength of installation explosion-proof piece.

To achieve the purpose, the utility model adopts the following technical proposal:

the top cover comprises a top cover body, wherein a step hole is formed in the top cover body and used for installing an explosion-proof sheet, a reinforcing step is arranged at the edge of the step hole and is arranged along the circumferential closed loop of the step hole, and the step surface of the reinforcing step is located on one side of the step hole.

Optionally, the step surface of the step hole is arranged on the outer surface of the top cover body, so that the explosion-proof sheet can be arranged on the outer surface of the top cover body.

Optionally, the step height of the reinforcement step is greater than the step height of the stepped bore.

Optionally, the reinforcement step is disposed coaxially with the stepped bore.

Optionally, the top cover body is further provided with a first pole mounting hole and a second pole mounting hole for mounting the first pole and the second pole.

Optionally, the top cover body is further provided with a liquid injection hole for injecting electrolyte into the battery.

Another object of the utility model is to provide a top cap subassembly has the technological effect who improves the explosion-proof position structural strength of battery.

a top cover assembly comprises an explosion-proof sheet and the top cover, wherein the explosion-proof sheet is arranged in a step hole in the top cover.

Optionally, the anti-explosion device further comprises an anti-explosion sheet protection film, wherein a through hole is formed in the anti-explosion sheet protection film, and the anti-explosion sheet protection film is bonded to the edge of the reinforced step.

It is still another object of the present invention to provide a battery having high safety.

a battery comprises a shell, an electric core and the top cover assembly, wherein the shell is provided with an opening, the electric core is arranged in the shell, and the top cover assembly is plugged in the opening.

Has the advantages that:

the utility model provides a top cap sets up the step hole that is used for installing the explosion-proof piece on the top cap body, sets up at the border in step hole and strengthens the step, should strengthen the step along the circumference closed loop setting in step hole, and the step face of strengthening the step is located one side in step hole, strengthens the step and has formed one deck additional strengthening at the border in step hole, has effectively improved the structural strength in step hole to the effect in protection step hole has, and then has effectively improved the structural strength of battery explosion-proof position.

The utility model also provides a top cap subassembly, including explosion-proof piece and foretell top cap, this explosion-proof piece is installed at the step hole of top cap downtheholely, and the higher step hole of structural strength has not only improved the structural strength of battery explosion-proof position, still has the effect that the protection explosion-proof piece avoids colliding with in the external world.

The utility model also provides a battery, including casing, electric core and foretell top cap assembly, in the casing was arranged in to the electric core, the top cap assembly shutoff was on the opening of casing, and the explosion-proof position of this battery has higher structural strength, and consequently this battery has higher security.

Drawings

Fig. 1 is a schematic structural diagram of a top cover provided by the present invention;

FIG. 2 is an enlarged partial cross-sectional view of the step bore and reinforced step of FIG. 1;

fig. 3 is an exploded view of the header assembly provided by the present invention;

fig. 4 is an assembly structure diagram of the top cover assembly provided by the present invention.

In the figure:

100. a top cover body; 110. a stepped bore; 120. reinforcing the step; 130. a first pole mounting hole; 140. a second pole mounting hole; 150. a liquid injection hole; 200. an explosion-proof sheet; 300. an explosion-proof sheet protective film; 410. a first pole column; 420. and a second pole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

The utility model provides a top cap has the technological effect of the step hole structural strength who improves the installation explosion-proof piece, and then can improve the structural strength of the explosion-proof position of battery.

Specifically, as shown in fig. 1 and fig. 2, the top cover comprises a top cover body 100, a stepped hole 110 is formed in the top cover body 100 and is used for installing the explosion-proof sheet 200, a reinforcing step 120 is arranged at the edge of the stepped hole 110, the reinforcing step 120 is arranged in a closed loop along the circumferential direction of the stepped hole 110, and the stepped surface of the reinforcing step 120 is located at one side of the stepped hole 110.

The reinforced step 120 forms a layer of reinforced structure at the edge of the step hole 110, effectively improves the structural strength of the step hole 110, and has the function of protecting the step hole 110 from external collision, thereby effectively improving the structural strength of the explosion-proof position of the battery.

Optionally, above-mentioned step 120 of strengthening can be one-level step, two-stage step or even multistage step the utility model provides an among the technical scheme, as shown in fig. 1 and fig. 2, strengthen step 120 and be one-level step, when improving step hole 110 structural strength, still simplify the top cap structure as far as possible, reduce the top cap volume.

Alternatively, the stepped hole 110 may have various shapes, such as a circle, an ellipse, a racetrack shape, a square shape, or a drop shape, and may be set according to practical applications. Accordingly, the shape of the explosion-proof plate 200 may be various shapes such as a circle, an ellipse, a racetrack, a square, or a drop, and the shape of the explosion-proof plate 200 may be consistent with that of the stepped hole 110. The utility model provides an among the technical scheme, step hole 110 and explosion-proof piece 200 are circular. Optionally, above-mentioned strengthen step 120 can be multiple shapes such as circular, oval, runway shape, square or water droplet shape, and the shape of strengthening step 120 can be the same with the shape of step hole 110, also can be different the utility model provides an among the technical scheme, the shape of strengthening step 120 is the same with the shape of step hole 110, is circular for top cap overall structure uniformity is better.

Preferably, the stepped surface of the stepped hole 110 is disposed on the outer surface of the top cap body 100, so that the rupture disk 200 can be mounted on the outer surface of the top cap body 100. The outer surface of the top cover body 100, i.e., the surface facing the outside of the battery case, is the upper surface of the top cover body 100 in fig. 1 and 2, and the inner surface of the top cover body 100, i.e., the surface facing the inside of the battery case, is the lower surface of the top cover body 100 in fig. 1 and 2. In the prior art, the explosion-proof sheet is usually installed inside the battery case, that is, the explosion-proof sheet in the prior art is installed on the lower surface of the top cover body, and this structural form increases the risk that metal particles fall into the inside of the battery when the explosion-proof sheet is installed. To this problem the utility model provides an among the technical scheme, the surface of top cap body 100 is arranged in to the step face of step hole 110 for explosion-proof piece 200 can be installed at top cap body 100's surface, and promptly, explosion-proof piece 200 is installed in the battery case outside, and metal particle drops the inside risk of battery when greatly reduced installation explosion-proof piece 200, has effectively improved the security of battery.

Optionally, the step height of the reinforced step 120 is greater than the step height of the stepped hole 110, so that the structural strength of the reinforced step 120 is greater than that of the stepped hole 110, and further the structural strength of the stepped hole 110 is improved.

Preferably, the step height of the stepped hole 110 is 0.3-2.0mm, and may be, for example, 0.3mm, 1.0mm, 2.0mm, or the like; the sum of the step height of the stepped hole 110 and the step height of the reinforcing step 120 is 0.5-3.0mm, and illustratively, may be 0.5mm, 1.0mm, 2.0mm, or 3.0mm, and the like, so that the structural strength of the stepped hole 110 is improved, and the overall height of the explosion-proof position of the battery is reduced as much as possible, thereby achieving the effect of reducing the volume of the battery.

Alternatively, the outer diameter of the reinforcement step 120 is between 1-5mm, and may be, for example, 1mm, 2mm, 3mm, or 5mm, and the like, which may be set according to the size of the rupture disk 200 and the structural strength requirement of the stepped hole 110.

Alternatively, as shown in fig. 1 and 2, the reinforcement step 120 is coaxially disposed with the stepped hole 110, so that the structural strength is uniform in the circumferential direction of the stepped hole 110.

Further, as shown in fig. 1 and 2, the top cover body 100 further has a first pole mounting hole 130 and a second pole mounting hole 140 formed thereon, so as to mount the first pole 410 and the second pole 420.

Further, as shown in fig. 1 and 2, the top cover body 100 is further opened with a liquid injection hole 150, and an electrolyte is injected into the battery through the liquid injection hole 150.

The utility model provides a top cap, set up the step hole 110 that is used for installing explosion-proof piece 200 on top cap body 100, border at step hole 110 sets up and strengthens step 120, should strengthen step 120 along the circumference closed loop setting of step hole 110, and the step face of strengthening step 120 is located one side of step hole 110, it has formed one deck additional strengthening to strengthen step 120 at the border of step hole 110, the structural strength of step hole 110 has effectively been improved, and have the effect of protection step hole 110, and then effectively improved the structural strength of battery explosion-proof position.

The utility model also provides a top cap subassembly, as shown in fig. 3 and fig. 4, this top cap subassembly includes explosion-proof piece 200 and foretell top cap, and explosion-proof piece 200 is installed in the step hole 110 on the top cap, and the higher step hole 110 of structural strength has not only improved the structural strength of battery explosion-proof position, still has the effect that protection explosion-proof piece 200 avoids the external world to collide with.

Further, the above-mentioned rupture disk 200 is mounted on the stepped surface of the stepped hole 110 to improve the mounting stability and reliability of the rupture disk 200.

Further, as shown in fig. 3 and 4, the utility model provides a top cap assembly still includes explosion-proof piece protection film 300, has seted up the through-hole on this explosion-proof piece protection film 300, and explosion-proof piece protection film 300 bonds in the border of strengthening step 120 to get up the shutoff of the enhancement step 120 of ring structure, on in order to avoid debris or electrolyte to fall to explosion-proof piece 200.

Alternatively, the number of the through holes on the rupture disk protection film 300 may be one, two or more, and may be set according to actual requirements. Optionally, the shape of the through hole on the rupture disk protection film 300 may be a plurality of shapes such as a circle, an ellipse, a racetrack, a square or a drop, and may be set according to actual requirements.

Further, as shown in fig. 3 and 4, the top cap assembly further includes a first pole column 410 and a second pole column 420, the first pole column 410 is fixed in the first pole column mounting hole 130, the second pole column 420 is fixed in the second pole column mounting hole 140, and the first pole column 410 and the second pole column 420 are used for electrically connecting the battery with an external component.

The utility model also provides a battery, this battery include casing, electric core and foretell top cap assembly, and the casing is equipped with the opening, and in the casing was arranged in to electric core, top cap assembly shutoff in the opening, the explosion-proof position of this battery had higher structural strength, therefore this battery has higher security.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The top cover is characterized by comprising a top cover body (100), a step hole (110) is formed in the top cover body (100) and used for installing an explosion-proof piece (200), a reinforcing step (120) is arranged at the edge of the step hole (110), the reinforcing step (120) is arranged along the circumferential closed loop of the step hole (110), and the step surface of the reinforcing step (120) is located on one side of the step hole (110).

2. The top cap according to claim 1, wherein the step surface of the step hole (110) is disposed on the outer surface of the top cap body (100) so that the rupture disk (200) can be mounted on the outer surface of the top cap body (100).

3. The overcap of claims 1 or 2, wherein the reinforcement step (120) has a step height greater than a step height of the stepped bore (110).

4. Overcap according to claim 1 or 2, characterized in that the reinforcement step (120) is arranged coaxially with the stepped bore (110).

5. The top cover according to claim 1 or 2, wherein the top cover body (100) is further provided with a first pole mounting hole (130) and a second pole mounting hole (140) for mounting the first pole (410) and the second pole (420).

6. The top cover of claim 1 or 2, wherein the top cover body (100) is further provided with a liquid injection hole (150) for injecting electrolyte into the battery.

7. A header assembly, comprising a rupture disc (200) and a header according to any of claims 1 to 6, the rupture disc (200) being mounted in a stepped bore (110) in the header.

8. The top cover assembly of claim 7, further comprising a rupture disk protection film (300), wherein a through hole is formed in the rupture disk protection film (300), and the rupture disk protection film (300) is adhered to the edge of the reinforcement step (120).

9. A battery comprising a housing, a cell and the cap assembly of claim 7 or 8, wherein the housing has an opening, the cell is disposed in the housing, and the cap assembly seals the opening.