CN218123573U

CN218123573U - Battery and top cover structure thereof

Info

Publication number: CN218123573U
Application number: CN202221908972.7U
Authority: CN
Inventors: 黄泽宇; 陈贤锐
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2022-12-23
Anticipated expiration: 2032-07-21

Abstract

The utility model discloses a battery and a top cover structure thereof, the top cover structure of the battery comprises a first component and a second component, the second component is arranged around the edge of the first component, the thickness of the middle part of the first component is less than that of the edge of the first component; the thickness through the middle part of first component is less than the setting of the thickness of the edge of first component, when guaranteeing the sealed effect of second component and casing, the effectual thickness that reduces the middle part of first component to reduce top cap structure's weight, and then reduce battery case's weight, under the same condition of battery weight, can effectual promotion battery's energy density.

Description

Battery and top cover structure thereof

Technical Field

The utility model relates to a lithium cell manufacturing technology field specifically is a battery and top cap structure thereof.

Background

The lithium ion battery has the advantages of high working voltage, large energy density, long cycle life, no memory effect and the like, and becomes a main power supply of various portable electronic products. With the further popularization of new energy industries such as energy storage batteries, the demand of power and energy storage type lithium ion batteries will increase significantly.

The thickness of the cover plate of the existing battery is thick, so that the weight of a battery shell is heavy, and further under the condition that the thickness is the same, the energy density of the battery is low, but when the wall thickness of the cover plate is integrally reduced, the connection effect of the cover plate and the shell is poor due to the fact that the wall thickness of the cover plate is thin.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application is through providing a battery top cap structure to it is thicker to solve the thickness of cover plate, and the weight that leads to battery case is heavier, influences the energy density technical problem of battery.

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

a battery top cap structure comprising a first member and a second member disposed around a peripheral edge of the first member, a central portion of the first member having a thickness less than a thickness of the edge of the first member.

Preferably, the second member comprises a bottom wall and a side wall, the bottom wall connecting the first member and the side wall.

Preferably, the thickness of the middle portion of the first member is smaller than the thickness of the bottom wall.

Preferably, the thickness of the bottom wall is the same as the thickness of the side wall.

Preferably, an arc portion is connected between the bottom wall and the side wall.

Preferably, the bottom wall partially coincides with the first member in an orthographic projection of the first member.

Preferably, the bottom wall is welded to the first member.

Preferably, the thickness of the second member is 0.3 to 0.5mm.

Preferably, the thickness of the middle portion of the first member is 0.03-0.2mm.

Another object of the utility model is to: the battery comprises a shell, a cover plate assembly and an electrode assembly, wherein the shell is provided with an opening, the cover plate assembly seals the opening and forms a cavity with the shell, the electrode assembly is arranged in the cavity, and the cover plate assembly is of a battery top cover structure as described in the specification.

Compared with the prior art, the utility model discloses the beneficial effect who gains does:

a battery top cover structure is used by matching a first component and a second component, and the second component is used for being connected with a shell of a battery so as to realize that the top cover structure seals an opening of the shell. The thickness through the middle part of first component is less than the setting of the thickness of the edge of first component, when guaranteeing the sealed effect of second component and casing, the effectual thickness that reduces the middle part of first component to reduce top cap structure's weight, and then reduce battery case's weight, under the same condition of battery weight, can effectual promotion battery's energy density.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic sectional view of the present invention.

Fig. 3 is a schematic view of the structure at a in fig. 2.

Fig. 4 is a schematic structural view of a second member of the present invention.

Reference numerals:

100. a roof structure;

10. a first member;

20. a second member; 21. a bottom wall; 22. a side wall;

30. an arc-shaped portion;

40. round corners;

g. a thickness of a middle portion of the first member; e. a thickness of an edge of the first member; h. a thickness of the second member.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "including" and "having," and any variations thereof, in the description and claims of the invention and the above description of the drawings are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of the present invention or in the above-described drawings are used for distinguishing between different objects and not for describing a particular sequential or chronological relationship.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

For a better understanding of the present invention, embodiments of the present invention are described below with reference to fig. 1 to 4.

Referring to fig. 1 to 4, an embodiment of the present invention provides a battery top cover structure, including a first member 10 and a second member 20, wherein the second member 20 is disposed around a peripheral edge of the first member 10, and a thickness g of a middle portion of the first member 10 is smaller than a thickness of an edge of the first member 10.

Compared with the prior art, the embodiment of the utility model provides a battery top cap structure, through the cooperation use of first component 10, second component 20 is used for being connected with the casing of battery to realize the opening of top cap structure 100 sealed casing. Through the setting that the thickness g of the middle part of first component 10 is less than the thickness of the edge of first component 10, when guaranteeing the sealed effect of second component 20 and casing, the effectual thickness g that reduces the middle part of first component 10 to reduce top cap structure 100's weight, and then reduce battery case's weight, under the same circumstances of battery weight, can effectual promotion battery's energy density.

The top cover structure 100 of the embodiment of the present invention may adopt a pit punching forming process, so that the thickness g of the middle portion of the first member 10 is smaller than the thickness of the edge of the first member 10; or a pit punching forming process can be adopted firstly to keep the thickness of the top cover structure 100 consistent, then the top cover structure 100 is cut, the middle part of the upper end of the top cover structure 100 is cut off, a hollow structure is formed in the middle part of the upper end of the top cover structure 100, and finally the first member 10 and the top cover structure 100 are welded to cover the hollow structure, so that the thickness of the first member 10 is smaller than the thickness h of the second member 20.

The second member 20 of the embodiment of the present invention includes a bottom wall 21 and a side wall 22, and the bottom wall 21 connects the first member 10 and the side wall 22. Through the cooperative use of the bottom wall 21 and the side wall 22, the bottom wall 21 connects the first member 10 and the side wall 22 to form a top cover structure 100 of the sealed housing.

The thickness g of the middle part of the first member 10 of the embodiment of the present invention is smaller than the thickness of the bottom wall 21. Through the thickness g of the middle part of the first member 10 and the thickness of the bottom wall 21, the thickness g of the middle part of the first member 10 is smaller than the thickness of the bottom wall 21, and the thickness g of the middle part of the first member 10 is reduced, so that the weight of the top cover structure 100 is reduced, and the weight of the battery shell is further reduced.

The thickness of the bottom wall 21 of the embodiment of the utility model is the same as the thickness of the side wall 22. Through the thickness setting of bottom wall 21, lateral wall 22, the thickness of bottom wall 21 is the same with the thickness of lateral wall 22, and the thickness uniformity of effectual bottom wall 21 and lateral wall 22 of keeping guarantees the effect of being connected of bottom wall 21 and first component 10 simultaneously.

Referring to fig. 3, an arc portion 30 is connected between the bottom wall 21 and the side wall 22 according to the embodiment of the present invention. The curved portion 30 is used to connect the bottom wall 21 and the side wall 22, and has a transitional effect to prevent the junction between the bottom wall 21 and the side wall 22 from forming a sharp corner and scratching a worker or a user.

The bottom wall 21 of the embodiment of the present invention partially overlaps the first member 10 in the orthographic projection of the first member 10. The bottom wall 21 partially overlaps the first member 10 in the orthographic projection of the first member 10, so that the welding firmness of the bottom wall 21 and the first member 10 is ensured, and the welding firmness of the first member 10 and the second member 20 is improved.

The utility model discloses diapire 21 and first component 10 welding of embodiment. The second member 20 and the first member 10 are effectively assembled by welding the bottom wall 21 to the first member 10 to form the top cover structure 100 of the hermetic case.

The thickness h of the second member 20 of the embodiment of the utility model is 0.3-0.5 mm. The thickness h of the second member 20 is not too thick or too thin, so that the sealing effect between the second member 20 and the housing is ensured, when the thickness of the second member 20 is too thick, the weight of the second member 20 is increased, which affects the weight of the top cover structure 100, and when the thickness h of the second member 20 is too thin, the sealing effect between the second member 20 and the housing is easily poor.

Preferably, the thickness h of the second member 20 is 0.4mm.

The utility model discloses thickness g at the middle part of first component 10 is 0.03-0.2mm, and thickness e at the edge of first component 10 is 0.3-0.5mm, makes thickness g at the middle part of first component 10 be less than thickness e at the edge of first component 10 to reduce top cap structure 100's weight, and then reduce battery case's weight.

Preferably, the thickness g of the middle portion of the first member 10 is 0.1mm.

The four corners of the first member 10 and the second member 20 of the embodiment of the present invention are all provided with fillets 40. By the arrangement of the fillets 40, the fillets 40 are further arranged at the four corners of the first member 10 and the second member 20, so that the four corners of the first member 10 and the second member 20 are prevented from forming sharp corners, and a worker or a user is prevented from being scratched.

Another embodiment of the utility model provides a battery, including casing, apron subassembly and electrode subassembly, the casing has the opening, the apron subassembly seal opening and the casing between be formed with the cavity, electrode subassembly sets up in the cavity, the apron subassembly is the battery top cap structure of above-mentioned embodiment.

Compared with the prior art, the utility model discloses another embodiment is a battery, use through casing, apron subassembly, electrode subassembly's cooperation, this apron subassembly is the battery top cap structure of above-mentioned embodiment, this top cap structure 100 is when guaranteeing the welding effect and the sealed effect of second component 20 and casing, the effectual thickness g that reduces the middle part of first component 10 to reduce top cap structure 100's weight, and then reduce battery case's weight, under the same condition of battery weight, can effectually promote the energy density of battery.

The utility model discloses electrode subassembly of another embodiment includes positive pole piece, negative pole piece and separator. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive pole mass flow body includes anodal coating district and connects in anodal utmost point ear in anodal coating district, and anodal coating district has anodal active substance layer, and anodal utmost point ear does not coat anodal active substance layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative coating area and a negative electrode lug connected to the negative coating area, the negative coating area is coated with a negative active material layer, and the negative electrode lug is not coated with the negative active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. The material of the spacer may be PP (polypropylene) or PE (polyethylene).

The housing of the present invention can be a hollow structure with one side open or two sides open.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A battery top cover structure comprising a first member (10) and a second member (20), said second member (20) being disposed around a peripheral edge of said first member (10), a thickness (g) of a central portion of said first member (10) being smaller than a thickness of an edge of said first member (10).

2. A battery top cover structure according to claim 1, wherein said second member (20) comprises a bottom wall (21) and a side wall (22), said bottom wall (21) connecting said first member (10) and said side wall (22).

3. A battery top cover structure according to claim 2, characterized in that the thickness (g) of the middle part of said first member (10) is smaller than the thickness of said bottom wall (21).

4. A battery top cover structure according to claim 2, characterized in that the thickness of said bottom wall (21) is the same as the thickness of said side walls (22).

5. A battery top cover structure according to claim 2, wherein an arc-shaped portion (30) is connected between said bottom wall (21) and said side wall (22).

6. A battery top cover structure according to claim 2, wherein said bottom wall (21) is partially coincident with said first member (10) in an orthographic projection of said first member (10).

7. A battery top cover structure according to claim 2, wherein said bottom wall (21) is welded to said first member (10).

8. A battery top cover structure according to any of claims 1-7, wherein the thickness (h) of said second member (20) is 0.3-0.5 mm.

9. A battery top cover structure according to any one of claims 1-7, wherein the thickness (g) of the middle portion of said first member (10) is 0.03-0.2mm.

10. A battery comprising a case having an opening, a cap plate assembly sealing the opening and forming a cavity with the case, and an electrode assembly disposed in the cavity, the cap plate assembly being the battery top cap structure of any one of claims 1-9.