CN217182289U

CN217182289U - Housing and battery

Info

Publication number: CN217182289U
Application number: CN202221044652.1U
Authority: CN
Inventors: 单雪燕
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-04-30
Filing date: 2022-04-30
Publication date: 2022-08-12
Anticipated expiration: 2032-04-30

Abstract

The utility model discloses a shell, this shell are used for the battery, and this shell includes cylinder lateral wall and top cap. The top cover is connected to the top of the cylindrical side wall and comprises a first portion and a second portion which are connected with each other, wherein the first portion is annular, the first portion is made of steel, the periphery of the first portion is connected with the top of the cylindrical side wall, the second portion is located on the radial inner portion of the first portion, and the second portion is made of aluminum. The invention divides the top cover into two parts, the first part is arranged at the periphery of the top cover and is made of steel, the second part is made of aluminum, after the heat dissipation of the battery is carried out after the battery is extruded, the cylindrical side wall extrudes the top cover along the radial direction, and the first part positioned at the outside adopts the steel, and has higher hardness to resist the extrusion of the cylindrical side wall, thereby maintaining the top cover of the top cover and preventing the deformation of the top cover.

Description

Housing and battery

Technical Field

The utility model relates to a lithium cell field of making, concretely relates to shell and battery.

Background

As one of the most core components of new energy vehicles, lithium ions have the advantages of high energy density, long cycle life, safety, environmental protection, and the like, so that lithium batteries are becoming the mainstream direction of the electric era.

Lithium ion batteries are morphologically divided into hard shell batteries, soft package batteries and batteries, wherein large batteries gradually become the mainstream direction of the market along with the development of technologies due to the advantages of high volume energy density, simple structure, easy grouping, convenience in standardization and the like.

The battery includes a housing and a cylindrical cell. The shell comprises a top cover, a bottom cover and a cylindrical side wall, the top cover and the bottom cover are respectively connected to the top and the bottom of the cylindrical side wall, the cylindrical battery cell is installed in the shell, two output poles are arranged at two ends of the cylindrical battery cell, one output pole is a negative pole, the negative pole is close to the top cover and outputs through the top cover, the other output pole is a positive pole, the positive pole is close to the bottom cover and outputs through the rivet of the bottom cover, and the rivet and the bottom cover are arranged in an insulating mode.

The battery can produce steam at the in-process of using to make the middle inflation of cylinder lateral wall, thereby make the top of cylinder lateral wall can extrude the top cap and make the top cap warp, and the top cap warp the back, generally is difficult for kick-backing, and then makes the whole discovery of battery deformation, influence the use.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a shell and battery to solve the problem that exists among the above-mentioned prior art.

In order to solve the above problem, according to an aspect of the present invention, there is provided a case for a battery, the case including:

a cylindrical side wall;

the top cap, the top cap includes first portion and second portion of interconnect, the first portion is cyclic annular, and adopts steel, the periphery of first portion connects the top of cylinder lateral wall, the second portion is located the radial inside of first portion, the second portion adopts the aluminum product.

In one embodiment, the thickness of the first portion is greater than the thickness of the second portion.

In one embodiment, the first portion is a circular ring.

In one embodiment, the second portion includes an annular connecting portion connected to an inner periphery of the first portion and a disk-shaped cover connected to a top of the annular connecting portion.

In one embodiment, the inner circumference of the first part is provided with a protrusion extending in the circumferential direction of the first part and located at the bottom of the inner circumference, and the annular connection is connected to the top of the protrusion.

In one embodiment, the annular connection extends axially beyond a top of the first portion.

In one embodiment, the first portion has a thickness of 0.6mm to 1 mm.

In one embodiment, the diameter of the second portion ranges from 20mm to 30 mm.

In one embodiment, the second portion is provided with an explosion-proof valve.

The invention also relates to a battery comprising:

the above-mentioned housing;

the cylindrical battery cell is installed in the shell, and the negative pole of the cylindrical battery cell is connected with the top cover.

The top cover is made of two parts, the first part is positioned on the periphery of the top cover and made of steel, the top cover can be prevented from being extruded and deformed by the cylindrical side wall, the second part is positioned in the first part and made of aluminum, the explosion-proof valve is further arranged on the second part, and when a certain amount of hot gas is dissipated from the interior of the battery, the explosion-proof valve can be broken through, the hot gas is dissipated, and heat accumulation in the battery is prevented, so that thermal runaway is caused. When the top cover is extruded from the outside, the top cover is not easy to deform, the use of the explosion-proof valve is not influenced, and the thermal runaway of the battery can be prevented.

Drawings

FIG. 1 is a schematic view of a top cover of one embodiment of the present invention.

Fig. 2 is a schematic diagram of a battery according to an embodiment of the present invention.

Reference numerals: 100. a battery; 1. a housing; 11. a top cover; 111. a first portion; 112. a second portion; 113. a projection; 1121. an annular connecting portion; 1122. a disc-shaped cover; 12. a cylindrical sidewall; 13. a bottom cover; 2. and (5) a cylindrical battery cell.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the objects, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

The invention relates to a housing 1, the housing 1 being for a battery 100, the housing 1 comprising a cylindrical side wall 12 and a top cover 11. The top cover 11 is attached to the top of the cylindrical side wall 12, and the top cover 11 includes a first portion 111 and a second portion 112 which are attached to each other, wherein the first portion 111 is annular, the first portion 111 is made of steel, the outer periphery of the first portion 111 is attached to the top of the cylindrical side wall 12, the second portion 112 is located radially inward of the first portion 111, and the second portion 112 is made of aluminum. The present invention divides the top cover 11 into two parts, the first part 111 is located at the periphery of the top cover 11 and made of steel, and the second part 112 is made of aluminum, when the battery 100 is extruded and radiates heat, the cylindrical side wall 12 presses the top cover 11 along the radial direction, the first part 111 located at the outside is made of steel and has higher hardness to resist the extrusion of the cylindrical side wall, thereby maintaining the top cover 11 of the top cover 11 and preventing the deformation of the top cover 11.

Optionally, the thickness of the first portion 111 is greater than that of the second portion 112, the first portion 111 is made of steel, and the selection of the steel with a greater thickness can increase the hardness of the first portion 111, which is more advantageous for preventing the deformation of the top cover 11.

Alternatively, as shown in fig. 1, the first portion 111 is a circular ring, the second portion 112 is circular and is located in the circular ring of the first portion 111, and in addition, the second portion 112, the first portion 111 and the top cover 11 are concentrically arranged. It should be understood that the first portion 111 may have other ring shapes, for example, the inner circumference of the first portion 111 may have a rectangular or square shape, and the shape of the second portion 112 may match the size of the inner circumference of the first portion 111. In addition, the center of the inner circumference of the first portion 111 and the center of the outer circumference may be offset, and the second portion 112 is connected to the inner circumference of the first portion 111, that is, the second portion 112 is slightly offset from the center of the top cover 11, and the positional relationship between the first portion 111 and the second portion 112 is not limited herein as long as the second portion 112 is connected to the inner circumference of the first portion 111.

Alternatively, as shown in fig. 1, the second portion 112 includes an annular connection part 1121 and a disk-shaped cover body 1122, the annular connection part 1121 is connected to the inner circumference of the first portion 111, the disk-shaped cover body 1122 is connected to the top of the annular connection part 1121, the second portion 112 is connected to the inner circumference of the first portion 111 through the annular connection part 1121, and the disk-shaped cover body 1122 is located at the top of the annular connection part 1121 for the negative output terminal of the battery 100, so as to facilitate connection of an external electronic device or other batteries 100.

Alternatively, with continued reference to fig. 1, the inner periphery of the first portion 111 is provided with a protrusion 113, the protrusion 113 extends along the circumferential direction of the first portion 111 and is located at the bottom of the inner periphery, the annular connection part 1121 is connected to the top of the protrusion 113, the protrusion 113 can support the annular connection part 1121, and the annular connection part 1121 and the protrusion 113 can be connected by laser welding.

Optionally, with continued reference to fig. 1, the annular connection 1121 extends axially beyond the top of the first portion 111.

Further, the thickness of the first portion 111 is 0.6mm to 1mm, and preferably, the thickness of the first portion 111 may be 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, but the thickness of the first portion 111 only needs to satisfy sufficient rigidity to prevent the deformation of the top cover 11. In addition, the thickness of the first portion 111 may also be rotated according to the size and energy density of the battery 100 or the impact strength of heat that may be dissipated from the cylindrical cell 2.

Alternatively, the diameter of the second portion 112 ranges from 20mm to 30mm, preferably, the diameter of the second portion 112 is 20mm, 21mm, 22mm, 24mm, 26mm, 28mm, 30mm, and the diameter range of the second portion 112 may be selected according to the size or specification of the battery 100.

Alternatively, the second portion 112 is provided with an explosion-proof valve, which is used to prevent the battery 100 from thermal runaway, so that due to fire, specifically, as shown in fig. 1, the explosion-proof valve may be a weak region extending along the circumferential direction of the first portion 111, and after the thermal runaway of the cylindrical battery cell 2, a large amount of hot air is generated, so that the weak region of the first portion 111 is broken, and then the hot air inside the battery 100 slowly dissipates, thereby preventing heat from being accumulated inside the battery 100.

The invention also relates to a battery 100, wherein the battery 100 comprises a cylindrical battery core 2 and the shell, the cylindrical battery core 2 is arranged in the shell, the negative electrode of the cylindrical battery core 2 is connected with a top cover 11, and current is output through the top cover 11. The battery 100 generally further comprises an adapter connected to the negative pole of the cylindrical cell 2 and the top cover 11, and more specifically, to the second portion 112 of the negative pole of the cylindrical cell 2 and the top cover 11, and the negative pole is output through the second portion 112.

In addition, the battery 100 further includes a bottom cover 13, the bottom cover 13 is connected to the bottom of the cylindrical sidewall 12, the bottom cover 13 is generally provided with a rivet, the rivet is insulated from the top cover 11, and the rivet is connected to the positive electrode for the output electrode of the positive electrode.

The top cover 11 of the invention is made of two parts, the first part 111 is positioned at the periphery of the top cover 11 and is made of steel materials, the top cover 11 can be prevented from being extruded and deformed by the cylindrical side wall 12, the second part 112 is positioned inside the first part 111, the second part 112 is made of aluminum materials, and the second part 112 is also provided with an explosion-proof valve which can be broken when a certain amount of hot air is radiated inside the battery 100, so that the hot air is radiated, and the heat accumulation inside the battery 100 is prevented, thereby causing thermal runaway. The top cover 11 of the present invention is not easily deformed when being externally pressed, and the use of the explosion-proof valve is not affected, so that the thermal runaway of the battery 100 can be prevented.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. A housing for a battery, the housing comprising:

a cylindrical sidewall;

2. The housing of claim 1, wherein the first portion has a thickness greater than a thickness of the second portion.

3. The housing of claim 2, wherein the first portion is a circular ring.

4. The housing of claim 2, wherein the second portion includes an annular connecting portion connected to an inner periphery of the first portion and a disk-shaped cover connected to a top of the annular connecting portion.

5. The housing of claim 4, wherein the inner periphery of the first portion is provided with a protrusion extending in the circumferential direction of the first portion and located at the bottom of the inner periphery, and the annular connection is connected to the top of the protrusion.

6. The housing of claim 5, wherein the annular connection extends axially beyond a top of the first portion.

7. The housing of claim 1, wherein the first portion has a thickness of 0.6mm to 1 mm.

8. The housing of claim 1, wherein the diameter of the second portion ranges from 20mm to 30 mm.

9. A casing according to claim 1, wherein the second portion is provided with an explosion-proof valve.

10. A battery, comprising:

the housing of any one of claims 1-9;