CN214589091U

CN214589091U - Lithium battery shell and lithium battery

Info

Publication number: CN214589091U
Application number: CN202022744185.0U
Authority: CN
Inventors: 何波; 张男
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-11-02
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a lithium battery shell and lithium cell, the casing is square box form, the top of casing is open structure the inboard edge in casing top is equipped with the excision district, the excision district forms the welding molten bath region with the apron side. The utility model provides a casing is square box form, and the casing top is uncovered structure, through set up the excision district at the inboard edge in casing top, excision district forms the welding molten bath region with the apron side during welding, both make fit clearance between apron and the casing can do for a short time, can avoid welding melting's metal to get into in the casing easily, the molten bath when apron and casing welding holds inside the reserved area, make the turn-ups can not surpass apron and casing upper surface, can prevent the turn-ups and impale the condition that the outside insulating film of battery caused the battery short circuit, the oral area of casing sets up behind the excision district simultaneously, be convenient for the assembly of apron and casing, collide with the harmfully that causes during the reduction assembly.

Description

Lithium battery shell and lithium battery

Technical Field

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

Background

With the development of modern society and the enhancement of environmental awareness of people, more and more devices select a lithium battery as a power supply, such as mobile phones, notebook computers, electric tools, electric automobiles and the like, so that a wide space is provided for the application and development of the lithium battery.

As shown in fig. 1, a lithium prismatic battery in the prior art generally includes a case 1 and a cap plate 2, and the case 1 and the cap plate 2 are generally laser welded. The existing design scheme is that a cover plate 2 is arranged in an opening of a shell 1, the upper surface of the cover plate 2 is flush with the top surface of the shell 1, a certain gap amount is reserved between the side surface of the cover plate 2 and the side surface of the shell 1 to serve as a welding pool, when the shell 1 and the cover plate 2 have manufacturing errors, the gap amount is larger or smaller, and when the gap amount is larger, molten metal for welding easily enters the shell 1; when the clearance volume is little, the apron 2 can have the turn-ups outstanding with 1 welding back of casing, cuts the later stage easily and wraps up in battery outside insulating film, brings the battery short circuit risk.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at: aiming at the defects of the cover plate and the shell of the lithium battery in the prior art during welding, the lithium battery shell and the lithium battery are provided, and a welding molten pool area is reserved at the edge of the opening of the shell, so that the fit clearance between the cover plate and the shell can be small, and the influence of the welding protruded flanging of the cover plate and the shell on the insulativity of the battery is solved.

In order to realize the purpose, the utility model discloses a technical scheme be:

the utility model provides a lithium battery shell, the casing is square box form, the top of casing is open structure the inboard edge in casing top is equipped with the excision district, excision district and apron side form the weld bath region.

The utility model discloses well casing is square box form, and the casing top is uncovered structure, through set up the excision district at the inboard edge in casing top, excision district and apron side form the welding molten bath region during welding, it can do for a short time to make the fit clearance between apron lateral surface and the casing medial surface, can avoid welding the molten metal to get into in the casing easily, the molten bath when apron and casing welding holds inside the reserved area, make the turn-ups can not exceed apron and casing upper surface, can prevent the turn-ups and impale the condition that the battery external insulation membrane caused the battery short circuit, casing oral area sets up behind the excision district simultaneously, be convenient for apron and casing assembly, collide with when reducing the assembly and cause badly.

As the utility model discloses a preferred scheme, the chamfer of excision district for locating the inboard edge in casing top, the chamfer makes casing and apron side form the welding weld pool region of triangle-shaped form. So set up, the production, processing and manufacturing of the casing of being convenient for.

As the utility model discloses a preferred scheme, the right angle step of excision district for locating the inboard edge in casing top, the right angle step makes casing and apron side form the welding bath region of rectangle form.

As the utility model discloses a preferred scheme, the excision district is for locating the oblique angle step of the inboard edge in casing top, the oblique angle step makes casing and apron side form trapezoidal shape's welding bath region.

As the utility model discloses a preferred scheme, the side inner wall is equipped with the thrust step about the casing, the thrust step is used for the apron to assemble the ascending position of time limit apron in casing direction of height to the casing.

A lithium battery comprises the lithium battery shell.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model discloses well casing is square box form, and the casing top is uncovered structure, through set up the excision district at the inboard edge in casing top, excision district and apron side form the welding molten bath region during welding, both make the fit clearance between apron and the casing can do for a short time, can avoid welding in the molten metal gets into the casing easily, the molten bath when apron and casing welding holds inside the reserved area, make the turn-ups can not surpass apron and casing upper surface, can prevent the turn-ups and impale the condition that the outside insulating film of battery caused the battery short circuit, casing oral area sets up behind the excision district simultaneously, be convenient for apron and casing assembly, collide with when reducing the assembly and cause badly.

Drawings

Fig. 1 is a schematic view of a cover plate and a case assembly of a conventional lithium battery.

Fig. 2 is a top view of the lithium battery case of the present invention.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is an enlarged view of the first structure at B in fig. 3.

Fig. 5 is an enlarged view of a second structure at B in fig. 3.

Fig. 6 is an enlarged view of the third structure at B in fig. 3.

Fig. 7 is a perspective view of the upper portion of the housing corresponding to fig. 4.

The labels in the figure are: 1-shell, 11-cut-off area, 12-thrust step and 2-cover plate.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1

The present embodiment provides a lithium battery case;

as shown in fig. 2 to 7, in the lithium battery case in the embodiment, the case 1 is in a square box shape, the top of the case 1 is in an open structure, a cut-off region 11 is arranged at an inner side edge of the top of the case 1, and the cut-off region 11 and a side surface of the cover plate 2 form a welding pool region.

In this embodiment, the cut-out region 11 is a chamfer formed on the inner edge of the top of the housing 1, and the chamfer forms a triangular welding pool region between the housing 1 and the side surface of the cover plate 2, as shown in fig. 4. So set up, the production, processing and manufacturing of the casing of being convenient for.

In this embodiment, the inner walls of the left and right side surfaces of the housing 1 are provided with anti-thrust steps 12, and the anti-thrust steps 12 are used for limiting the position of the cover plate 2 in the height direction of the housing 1 when the cover plate 2 is assembled on the housing 1.

Example 2

The difference between this embodiment and embodiment 1 is that the cut-out 11 is a right-angled step provided at the inner edge of the top of the housing 1, and the right-angled step forms a rectangular weld pool area between the housing 1 and the side of the cover plate 2, as shown in fig. 5. The right-angle step is adopted at the inner side edge of the top of the shell, so that the shell is convenient to produce and manufacture, a larger molten pool accumulation space can be obtained, and the cover plate and the shell are prevented from being welded with a convex flanging.

Example 3

The difference between this embodiment and

embodiments

1 and 2 is that the cut-out region 11 is a bevel step provided at the inner edge of the top of the housing 1, and the bevel step forms a trapezoidal weld pool region between the housing 1 and the side of the cover plate 2, as shown in fig. 6. The inner side edge of the top of the shell adopts the oblique angle step, so that the shell is convenient to produce and manufacture, a larger molten pool accumulation space can be obtained, and the welding of the cover plate and the shell is prevented from being raised and flanged.

Example 4

The present embodiment provides a lithium battery including the lithium battery case according to any one of embodiments 1 to 3. When the shell and the cover plate are welded, the cover plate is firstly installed in the opening of the shell, the peripheral side surfaces of the cover plate are matched with the peripheral inner wall of the shell, and a welding pool area is formed between the upper part of the peripheral side surfaces of the cover plate and a cutting area of the edge of the inner side of the top of the shell.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the principles of the present invention should be included within the scope of the present invention.

Claims

1. The lithium battery shell is characterized in that the shell is in a square box shape, the top of the shell is in an open structure, the inner walls of the left side and the right side of the shell are provided with thrust steps, the thrust steps are used for limiting the position of a cover plate in the height direction of the shell when the cover plate is assembled on the shell, a cutting area is arranged on the inner side edge of the top of the shell, and the cutting area and the side face of the cover plate form a welding pool area.

2. The lithium battery cell casing of claim 1, wherein the cut-out is a chamfer formed on an inside edge of the top of the casing, the chamfer forming a weld pool area of triangular shape between the casing and the side of the cover plate.

3. The lithium battery cell casing of claim 1, wherein the cut-out is a right-angled step formed on the inside edge of the top of the casing, the right-angled step forming a rectangular weld pool area between the casing and the side of the cover plate.

4. The lithium battery cell casing of claim 1, wherein the cut-out is a beveled step formed on the inside edge of the top of the casing, the beveled step forming a trapezoidal shaped weld pool area between the casing and the side of the cover plate.

5. A lithium battery comprising a lithium battery casing according to any one of claims 1 to 4.