CN221805772U

CN221805772U - Combined cap with top cover provided with nicks and battery monomer

Info

Publication number: CN221805772U
Application number: CN202323162607.3U
Authority: CN
Inventors: 朱彦强; 刘世哲; 吴正杰; 孙新科; 张超; 李斌青
Original assignee: Zhengzhou Bak Battery Co Ltd
Current assignee: Zhengzhou Bak Battery Co Ltd
Priority date: 2023-11-21
Filing date: 2023-11-21
Publication date: 2024-10-01
Anticipated expiration: 2033-11-21

Abstract

The utility model discloses a combined cap with a notched top cover and a battery monomer, which comprises a cylindrical shell and a combined cap with a notched top cover, wherein an electrode assembly is arranged in the cylindrical shell, a negative current collector of the electrode assembly is electrically connected with the cylindrical shell, and a positive current collector of the electrode assembly is electrically connected with the combined cap. The utility model is convenient for the top cover to break in time when the battery monomer is in thermal runaway, and is beneficial for other components of the combined cap to separate from the shell in time, thereby improving the heat dissipation and pressure release rate and the safety performance when the battery monomer is in thermal runaway.

Description

Combined cap with top cover provided with nicks and battery monomer

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a combined cap with a notched top cover and a battery monomer.

Background

With the widespread use of cylindrical lithium ion batteries, the safety of the batteries is also becoming more and more important. The existing cylindrical lithium ion battery generally comprises a shell, an electrode assembly, a combined cap and other structures, wherein the combined cap has a large influence on the safety of a battery cell. When the battery is out of control, the top cover in the combined cap is required to be broken in time, so that other parts of the combined cap are separated from the battery in time, battery heat is conveniently released, no notch exists in the combined cap of the conventional cylindrical lithium battery, and the top cover is not easy to break when out of control, so that the separation of the combined cap is hindered, and the safety of the lithium battery is influenced. Therefore, the combined cap with the notch on the top cover and the battery monomer are provided by the application, so that the top cover is convenient to break in time when thermal runaway occurs, and the effective strength of the top cover is not damaged, thereby being convenient for heat dissipation and pressure relief when the thermal runaway of the lithium battery occurs, and ensuring the safety of the lithium battery.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art and provides a combined cap with a notched top cover and a battery cell.

The aim of the utility model is achieved by the following technical scheme: the utility model provides a top cap combination cap of top cap area nick, includes the top cap, the top cap includes three support columns, the support column inboard is equipped with the nick, the bottom of top cap is equipped with the explosion proof piece, the below of explosion proof piece is equipped with sealing washer, insulating washer and orifice plate.

Still further, the remainder of the score is less than the thickness of the support post.

The further technical proposal is that the ratio of the allowance of the nick to the thickness of the support column is 20-80%.

The further technical scheme is that the top cover is made of SPCC material, and is 0.5mm in thickness, 19.40mm in diameter and 2.0mm in height.

The further technical scheme is that the inside of the three supporting columns of the top cover is subjected to thinning treatment.

The battery cell comprises a cylindrical shell and a combined cap with a top cover provided with a notch, wherein an electrode assembly is arranged in the cylindrical shell, a negative current collector of the electrode assembly is electrically connected with the cylindrical shell, and a positive current collector of the electrode assembly is electrically connected with the combined cap.

The further technical scheme is that a groove is formed below the opening of the cylindrical shell, the lower edge of the groove compresses the electrode assembly, and the combined cap is horizontally arranged on the upper edge of the groove.

The utility model has the following advantages:

According to the utility model, the nicks are arranged on the inner sides of the supporting columns of the top cover, so that the top cover is convenient to break in time when the battery monomer is in thermal runaway, other components of the combined cap are beneficial to separating from the shell in time, excessive heat is prevented from being concentrated in the battery shell, and the heat dissipation and pressure release rate and the safety performance of the battery monomer are improved when the battery monomer is in thermal runaway.

Drawings

Fig. 1 is a schematic structural view of a battery cell according to the present utility model;

FIG. 2 is a schematic top view of the composite cap of the present utility model;

fig. 3 is a schematic cross-sectional view of a composite cap of the present utility model.

In the figure, 1, a combined cap; 2. a cylindrical housing; 3. a top cover; 4. scoring; 5. explosion-proof sheet; 6. a seal ring; 7. an insulating gasket; 8. an orifice plate.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

In addition, the embodiments of the present utility model and the features of the embodiments may be combined with each other without collision.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present utility model and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 3, a top cap with a notch is combined cap, which comprises a top cap 3, the top cap 3 comprises three supporting columns, the inner sides of the supporting columns are provided with notches 4, so that the cap is convenient to break when a battery monomer is in thermal runaway, the bottom of the top cap 3 is provided with a bursting disc 5, and a sealing ring 6, an insulating gasket 7 and a pore plate 8 are arranged below the bursting disc 5 and used for ensuring the sealing performance of a battery, and after the top cap 3 breaks, other parts can be separated in time, so that the heat dissipation and pressure release rate is effectively improved.

In this embodiment, the margin of the notch 4 is smaller than the thickness of the support column, preferably, the ratio of the margin of the notch 4 to the thickness of the support column is 20% -80%, the support strength of the top cover can be reduced due to the too deep notch, the top cover is easy to break and fail, the too shallow notch can cause the top cover to break too high, the explosion-proof piece 5, the orifice plate 8 and the like are prevented from flying out, therefore, a proper notch depth needs to be selected, the margin of the notch is adjusted according to the breaking strength of the combined cap 1, when the internal pressure of the battery is increased, the notch 4 can be timely broken, the battery is timely cooled and decompressed, and the concentrated explosion of the heat is avoided.

In this embodiment, the top cover 3 is made of SPCC material, and has a thickness of 0.5mm, a diameter of 19.40mm, and a height of 2.0mm.

In this embodiment, the three support columns of the top cover 3 are thinned.

The battery cell comprises a cylindrical shell 2 and a combined cap 1 with a top cover provided with a notch, wherein an electrode assembly is arranged in the cylindrical shell 2, a negative current collector of the electrode assembly is electrically connected with the cylindrical shell 2, and a positive current collector of the electrode assembly is electrically connected with the combined cap 1.

In this embodiment, a groove is formed below the opening of the cylindrical housing 2, the groove is formed by machining, the lower edge of the groove compresses the electrode assembly to avoid displacement thereof, the combined cap 1 is horizontally arranged at the upper edge of the groove, and the opening end of the housing can be bent inwards by 90 ° or more by using a machining mode, so that the combined cap 1 and the cylindrical housing 2 together form a closed space of the battery, and internal electrolyte is prevented from leaking or external air and moisture are prevented from entering the battery.

The implementation principle of the utility model is as follows: the utility model provides a combined cap with a notched top cover and a battery cell, wherein when the internal pressure of the battery cell is in thermal runaway and reaches the rupture value of the combined cap 1, a supporting column of the top cover 3 can be opened and fall off from a notched 4 part, and other components of the combined cap 1 can be sprayed out in time and separated from a battery cell, so that the aim of pressure relief and heat dissipation is achieved.

Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.

Claims

1. A combined cap with a scored top cover, comprising a top cover (3), characterized in that: the top cover (3) comprises three supporting columns, nicks (4) are arranged on the inner sides of the supporting columns, explosion-proof pieces (5) are arranged at the bottoms of the top cover (3), and sealing rings (6), insulating washers (7) and pore plates (8) are arranged below the explosion-proof pieces (5).

2. The top scored composite cap of claim 1, wherein: the allowance of the nick (4) is smaller than the thickness of the supporting column.

3. The combination cap with a scored top cover according to claim 2, wherein: the ratio of the allowance of the notch (4) to the thickness of the support column is 20% -80%.

4. The top scored composite cap of claim 1, wherein: the top cover (3) is made of SPCC material, and has a thickness of 0.5mm, a diameter of 19.40mm and a height of 2.0mm.

5. The top scored composite cap of claim 1, wherein: and the insides of three support columns of the top cover (3) are subjected to thinning treatment.

6. A battery cell, characterized in that: the cap comprises a cylindrical shell (2) and the cap with the notch, wherein an electrode assembly is arranged in the cylindrical shell (2), a negative current collector of the electrode assembly is electrically connected with the cylindrical shell (2), and a positive current collector of the electrode assembly is electrically connected with the cap (1).

7. A battery cell as defined in claim 6, wherein: the electrode assembly is characterized in that a groove is formed below the opening of the cylindrical shell (2), the lower edge of the groove compresses the electrode assembly, and the combined cap (1) is horizontally arranged on the upper edge of the groove.