CN219513219U

CN219513219U - Explosion-proof steel shell of lithium battery

Info

Publication number: CN219513219U
Application number: CN202320340575.2U
Authority: CN
Inventors: 高善峰; 高浩善; 闻昱
Original assignee: Xinjiang Gaoshi New Energy Co ltd
Current assignee: Xinjiang Gaoshi New Energy Co ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-08-11
Anticipated expiration: 2033-02-28

Abstract

The utility model discloses an explosion-proof steel shell of a lithium battery, and relates to the technical field of batteries. The steel shell comprises a steel shell body, wherein the steel shell body comprises a steel shell side wall, the bottom of the steel shell side wall is integrally connected with a steel shell bottom wall, an explosion-proof area is arranged on the lower side of the steel shell bottom wall, and a circle of explosion-proof grooves are formed in the explosion-proof area; the thickness of the side wall of the steel shell is 0.21-0.23mm, the thickness of the bottom wall of the steel shell is 0.29-0.31mm, and the thickness of the explosion-proof groove is 0.14-0.16 mm. The explosion-proof steel shell has the explosion-proof performance, and the lithium battery does not need to be additionally welded with the explosion-proof piece, so that the manufacturing cost of the lithium battery can be reduced, and the lithium battery has stable explosion-proof performance.

Description

Explosion-proof steel shell of lithium battery

Technical Field

The utility model relates to the technical field of batteries, in particular to an explosion-proof steel shell of a lithium battery.

Background

The cylindrical lithium battery has the advantages of high capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, high-current discharge, electrochemical stability, safety in use, wide working temperature range, environmental friendliness and the like, and is increasingly widely applied. Generally, a cylindrical lithium ion battery includes a battery case, an active material contained in the battery case, an electrolyte impregnated in the battery case, a sealing body mounted on the battery case, and a sealing ring interposed between the sealing body and the battery case, and a bursting disc or a turnover disc is welded at the sealing body on the battery case by laser welding. For example, chinese patent document CN105261728A discloses a structure of a cylindrical lithium battery, including positive electrode assembly, explosion-proof sheet, little aluminum cap, sealing washer, positive electrode confluence disc, steel casing, electric core, the upper portion of steel casing is provided with round inwards sunken convex groove, the top of positive electrode terminal surface is provided with a plurality of first welding points, positive electrode confluence disc sets up at the top of positive electrode terminal surface, be provided with a plurality of second welding points on the positive electrode confluence disc, little aluminum cap sets up at the top of positive electrode confluence disc, explosion-proof sheet sets up at the bellied top of circular arc, the shape of explosion-proof sheet is that there is a circular arc sunken disc in the middle part, positive electrode assembly sets up at the top of explosion-proof sheet, the upper portion of sealing washer is provided with round opening seal groove inwards. According to the lithium ion battery in the prior art, after the explosion-proof sheet is welded at the top of the arc bulge at the upper part of the steel shell, the lithium ion battery has good explosion-proof performance, however, the cost of welding the explosion-proof sheet or the overturning sheet is higher, the welding process is more complex, a laser welding mode is required, and the welding seam is required to have higher precision.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the explosion-proof steel shell of the lithium battery aiming at the defects of the prior art, wherein the explosion-proof steel shell is provided with the explosion-proof performance, and the lithium battery does not need to be additionally welded with an explosion-proof piece, so that the manufacturing cost of the lithium battery can be reduced, and the lithium battery has stable explosion-proof performance.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the explosion-proof steel shell of the lithium battery comprises a steel shell body, wherein the steel shell body comprises a steel shell side wall, the bottom of the steel shell side wall is integrally connected with a steel shell bottom wall, an explosion-proof area is arranged on the lower side of the steel shell bottom wall, and a circle of explosion-proof grooves are formed in the explosion-proof area; the thickness of the side wall of the steel shell is 0.21-0.23mm, the thickness of the bottom wall of the steel shell is 0.29-0.31mm, and the thickness of the explosion-proof groove is 0.14-0.16 mm.

Preferably, the steel shell body is cylindrical in shape, the diameter of the steel shell body is 13-15mm, and the height of the steel shell body is 49-51mm.

Preferably, the thickness of the steel shell side wall is 0.22mm, the thickness of the steel shell bottom wall is 0.30mm, the thickness of the explosion-proof groove is 0.15mm, the diameter of the steel shell body is 14mm, and the height of the steel shell body is 15mm.

Preferably, the steel shell bottom wall is circular, the steel shell bottom wall is divided into two semicircular parts, the explosion-proof groove is arranged in one semicircular part of the steel shell bottom wall, the whole shape of the explosion-proof groove is rectangular, the explosion-proof groove is provided with an explosion-proof groove outer annular surface and an explosion-proof groove inner annular surface, the length of the explosion-proof groove outer annular surface is 7-9mm, the width of the explosion-proof groove outer annular surface is 3-5mm, and the interval between the explosion-proof groove outer annular surface and the explosion-proof groove inner annular surface is 0.59-0.61mm.

The beneficial effects of the utility model are as follows: because the explosion-proof area is arranged on the lower side of the bottom wall of the steel shell on the steel shell body, and the explosion-proof area is provided with a circle of explosion-proof grooves, when the pressure in the steel shell body reaches the warning pressure, the explosion-proof grooves of the explosion-proof area are cracked, so that steel sheets in the explosion-proof grooves are sprung outwards to separate, the pressure in the lithium battery is released, and the explosion-proof effect is achieved; the thickness of the steel shell side wall of the steel shell body is 0.21-0.23mm, the thickness of the steel shell bottom wall is 0.29-0.31mm, the thickness of the explosion-proof groove is 0.14-0.16 and mm, and the steel shell body with the thickness can improve a good protection effect on an internal battery core of a lithium battery and can enable the explosion-proof groove to bear the pressure of 2.0 Mpa. Therefore, the explosion-proof steel shell has the explosion-proof performance, and the lithium battery does not need to be additionally welded with the explosion-proof piece, so that the manufacturing cost of the lithium battery can be reduced, and the lithium battery has stable explosion-proof performance.

Drawings

Fig. 1 is a perspective view of an explosion-proof steel case of a lithium battery.

Fig. 2 is a bottom structural view of an explosion-proof steel case of a lithium battery.

In the figure: 100. a steel shell body; 1. a steel shell side wall; 2. a steel shell bottom wall; 3. an explosion-proof area; 4. an explosion-proof tank; 41. an outer ring surface of the explosion-proof groove; 42. an inner ring surface of the explosion-proof groove.

Detailed Description

The structural and operational principles of the present utility model will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the utility model relates to an explosion-proof steel shell of a lithium battery, which comprises a steel shell body 100, wherein the steel shell body 100 comprises a steel shell side wall 1, the bottom of the steel shell side wall 1 is integrally connected with a steel shell bottom wall 2, an explosion-proof area 3 is arranged on the lower side of the steel shell bottom wall 2, and a circle of explosion-proof grooves 4 are arranged in the explosion-proof area 3; the thickness of the steel shell side wall 1 is 0.21-0.23mm, the thickness of the steel shell bottom wall 2 is 0.29-0.31mm, and the thickness of the explosion-proof groove 4 is 0.14-0.16 mm. When the pressure in the steel shell body 100 reaches the warning pressure, the explosion-proof groove 4 of the explosion-proof area 3 is cracked, so that the steel sheet in the explosion-proof groove 4 is sprung outwards to separate, the pressure in the lithium battery is released, and the explosion-proof effect is achieved; the steel shell body with the thickness can improve a good protection effect on the internal battery core of the lithium battery, and can enable the explosion-proof groove to bear the pressure of 2.0 Mpa; the explosion-proof steel shell 100 has the explosion-proof performance, and the lithium battery does not need to be additionally welded with the explosion-proof piece, so that the manufacturing cost of the lithium battery can be reduced, and the lithium battery has stable explosion-proof performance.

As shown in fig. 1 and 2, the steel shell body 100 is cylindrical in shape, the diameter of the steel shell body 100 is 13-15mm, and the height of the steel shell body 100 is 49-51mm, which is a preferred mode of the present utility model. As a further preferable mode of the present utility model, the thickness of the steel shell side wall 1 is 0.22mm, the thickness of the steel shell bottom wall 2 is 0.30mm, the thickness of the explosion-proof groove 4 is 0.15mm, the diameter of the steel shell body 100 is 14mm, and the height of the steel shell body 100 is 15mm.

As shown in fig. 1 and 2, the steel shell bottom wall 2 is circular, the steel shell bottom wall 2 is divided into two semicircular parts, the explosion-proof groove 4 is arranged in one semicircular part of the steel shell bottom wall 2, the whole shape of the explosion-proof groove 4 is rectangular, the explosion-proof groove 4 is provided with an explosion-proof groove outer ring surface 41 and an explosion-proof groove inner ring surface 42, and the length of the explosion-proof groove outer ring surface 41 is 7-9mm, preferably 8mm; the width of the outer ring surface 41 of the explosion-proof groove is 3-5mm, preferably 4mm; the distance between the outer ring surface 41 of the explosion-proof tank and the inner ring surface 42 of the explosion-proof tank is 0.59-0.61mm, preferably 0.6mm; the explosion-proof tank 4 with the size can provide the steel shell body 100 of the lithium battery with the best explosion-proof performance.

In the foregoing, only the preferred embodiment of the present utility model is described, and any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical solutions of the present utility model fall within the scope of the technical solutions of the present utility model.

Claims

1. An explosion-proof steel shell of a lithium battery is characterized in that: the steel shell comprises a steel shell body (100), wherein the steel shell body (100) comprises a steel shell side wall (1), a steel shell bottom wall (2) is integrally connected with the bottom of the steel shell side wall (1), an explosion-proof area (3) is arranged on the lower side of the steel shell bottom wall (2), and a circle of explosion-proof grooves (4) are formed in the explosion-proof area (3); the thickness of the steel shell side wall (1) is 0.21-0.23mm, the thickness of the steel shell bottom wall (2) is 0.29-0.31mm, and the thickness of the explosion-proof groove (4) is 0.14-0.16 mm.

2. The explosion-proof steel case of lithium battery according to claim 1, wherein: the steel shell body (100) is cylindrical, the diameter of the steel shell body (100) is 13-15mm, and the height of the steel shell body (100) is 49-51mm.

3. The explosion-proof steel case of lithium battery according to claim 2, wherein: the thickness of the steel shell side wall (1) is 0.22mm, the thickness of the steel shell bottom wall (2) is 0.30mm, the thickness of the explosion-proof groove (4) is 0.15mm, the diameter of the steel shell body (100) is 14mm, and the height of the steel shell body (100) is 15mm.

4. The explosion-proof steel case of lithium battery according to claim 2, wherein: the steel shell bottom wall (2) is circular, the steel shell bottom wall (2) is divided into two semicircular parts, the explosion-proof groove (4) is arranged in one semicircular part of the steel shell bottom wall (2), the whole shape of the explosion-proof groove (4) is rectangular, the explosion-proof groove (4) is provided with an explosion-proof groove outer annular surface (41) and an explosion-proof groove inner annular surface (42), the length of the explosion-proof groove outer annular surface (41) is 7-9mm, the width of the explosion-proof groove outer annular surface (41) is 3-5mm, and the interval between the explosion-proof groove outer annular surface (41) and the explosion-proof groove inner annular surface (42) is 0.59-0.61mm.

5. The explosion-proof steel case of lithium battery according to claim 4, wherein: the length of the explosion-proof groove outer annular surface (41) is 8mm, the width of the explosion-proof groove outer annular surface (41) is 4mm, and the distance between the explosion-proof groove outer annular surface (41) and the explosion-proof groove inner annular surface (42) is 0.60mm.