CN217405563U

CN217405563U - Shell assembly and lithium battery

Info

Publication number: CN217405563U
Application number: CN202220406291.4U
Authority: CN
Inventors: 龙兵; 张道洋; 廖兴群; 胡大林
Original assignee: Guangdong Highpower New Energy Technology Co Ltd
Current assignee: Guangdong Highpower New Energy Technology Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-09-09
Anticipated expiration: 2032-02-24

Abstract

The application belongs to the technical field of batteries, and relates to a shell assembly and a lithium battery. The electrode core comprises a shell and a cover plate, wherein the shell is of a square structure with one open end, an accommodating cavity for accommodating the electrode core is formed in the shell, and the cover plate is buckled at the open end of the shell; the opening edge of casing is provided with outside extension portion, extension portion protrusion in the lateral wall of casing, the apron orientation be provided with on the side of casing to the convex flange of casing, the lateral surface of flange with the internal surface butt of the lateral wall of casing, the outward flange of apron with the laminating welding of extension portion. The utility model provides a shell subassembly, the flange can play prepositioning's effect to the apron, and when the outward flange of apron was laminated with the extension and is welded, the apron can not become flexible, improves welding quality.

Description

Shell assembly and lithium battery

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a shell assembly and a lithium battery.

Background

The existing square battery (adopting a square shell) is characterized in that in the production process of the battery, because the shell is thin, the top bottom edge, the side edge and the rear cover of the shell are easy to deform in the assembly of a structural part, the welding and the appearance of the battery can be directly influenced, the welding quality of the shell and a cover plate is poor, the gelation of a pole core in the shell is even influenced or the pole core in the shell is damaged, and further the electrochemical performance of the cell is deteriorated or partial safety test cannot pass.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will solve is: aiming at the problem that the welding quality of a shell and a cover plate of the existing square battery is poor, a shell assembly and a lithium battery are provided.

In order to solve the above technical problem, in one aspect, an embodiment of the present application provides an enclosure assembly, including a housing and a cover plate, where the housing is a square structure with an open end, a containing cavity for containing a pole piece is formed in the housing, and the cover plate is fastened at the open end of the housing;

the opening edge of casing is provided with outside extension portion, extension portion protrusion in the lateral wall of casing, the apron orientation be provided with on the side of casing to the convex flange of casing, the lateral surface of flange with the internal surface butt of the lateral wall of casing, the outward flange of apron with the laminating welding of extension portion.

Optionally, a positive electrode guide piece, a liquid injection hole, and a negative electrode guide piece are disposed on the side wall of the casing.

Optionally, the positive electrode guide piece, the liquid injection hole, and the negative electrode guide piece are located on the same side of the side wall, and the positive electrode guide piece is located between the liquid injection hole and the negative electrode guide piece.

Optionally, the positive electrode guide piece comprises a rivet and an insulating sealing element, a mounting hole is formed in the side wall of the housing, the insulating sealing element is connected between the hole wall of the mounting hole and the outer peripheral surface of the rivet in a sealing manner, the inner end of the rivet extends into the accommodating cavity of the housing and is connected with a positive electrode tab of the electrode core, and the outer end of the rivet extends out of the side wall of the housing;

the negative electrode guide piece is welded on the shell.

Optionally, the side wall of the casing includes a first side wall, a second side wall, a third side wall and a fourth side wall that are connected in sequence, and the positive electrode guide sheet, the liquid injection hole and the negative electrode guide sheet are disposed on the first side wall.

Optionally, the thickness of the flange is 0-1.5mm, and the height of the flange is 0-5 mm;

the distance between the flange and the edge of the cover plate is 0-5mm, and the width of the extending part is 0-5 mm.

Optionally, the outer edge of the cover plate is square, and the outer edge of the extension part is aligned with the outer edge of the cover plate or protrudes out of the outer edge of the cover plate.

Optionally, the housing is a steel shell.

According to shell subassembly of this application embodiment, the opening edge of casing is provided with the outside extension portion that extends, the extension portion protrusion in the lateral wall of casing, the apron orientation be provided with on a side of casing to the convex flange of casing, the lateral surface of flange with the internal surface butt of the lateral wall of casing, the outward flange of apron with the welding of extension portion laminating. The utility model provides a shell subassembly, the flange can play prepositioning's effect to the apron, and when the outward flange of apron was laminated with the extension and is welded, the apron can not become flexible, improves welding quality.

On the other hand, this application embodiment still provides a lithium cell, and it includes utmost point core and foretell shell subassembly, utmost point core sets up hold the intracavity, the flange with the upper surface butt of utmost point core.

Optionally, the accommodating cavity is a square cavity, and the pole core is square.

Drawings

FIG. 1 is a schematic view of a housing assembly provided by an embodiment of the present application;

fig. 2 is an exploded view of a lithium battery provided in an embodiment of the present application;

fig. 3 is a cross-sectional view of a lithium battery provided in an embodiment of the present application.

The reference numerals in the specification are as follows:

100. a housing assembly;

1. a housing; 11. an accommodating chamber; 12. an extension portion; 13. a positive electrode lead; 131. riveting; 132. an insulating seal; 14. a liquid injection hole; 15. a negative electrode lead; 16. a first side wall; 17. a second side wall;

2. a cover plate; 21. a flange;

200. a pole piece; 300. a positive electrode tab; 400. and a negative pole tab.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present application more clearly understood, the present application 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 merely illustrative of the present application and are not intended to limit the present application.

As shown in fig. 1, the housing assembly 100 provided in the embodiment of the present application includes a housing 1 and a cover plate 2, where the housing 1 is a square structure with an open end, a containing cavity 11 for containing a pole piece 200 is formed in the housing 1, and the cover plate 2 is buckled at the open end of the housing 1.

The opening edge of casing 1 is provided with outside extension 12, extension 12 protrusion in the lateral wall of casing 1, apron 2 orientation be provided with on the side of casing 1 to the convex flange 21 of casing 1, the lateral surface of flange 21 with the internal surface butt of the lateral wall of casing 1, the outward flange of apron 2 with the welding of laminating of extension 12.

In one embodiment, the side wall of the case 1 is provided with a positive electrode lead 13, a liquid inlet 14, and a negative electrode lead 15. After the liquid injection is completed, the liquid injection hole 14 is closed by a sealing member (not shown).

In one embodiment, the positive electrode lead 13, the liquid injection hole 14 and the negative electrode lead 15 are located on the same side of the side wall, and the positive electrode lead 13 is located between the liquid injection hole 14 and the negative electrode lead 15.

In an embodiment, the positive electrode lead 13 includes a rivet 131 and an insulating sealing member 132, a mounting hole (not shown) is disposed on a side wall of the housing 1, and the insulating sealing member 132 is hermetically connected between a hole wall of the mounting hole and an outer circumferential surface of the rivet 131, and specifically, the insulating sealing member 132 is interference-fitted between the hole wall of the mounting hole and the outer circumferential surface of the rivet 131. The inner end of the rivet 131 extends into the accommodating cavity 11 of the housing 1 and is connected with the positive pole tab 300 of the pole core 200, and the outer end of the rivet 131 extends out of the side wall of the housing 1. The negative electrode tab 400 of the electrode core 200 is electrically connected to the case 1 or the cap plate 2. Insulating seal 132 is a rubber ring.

The negative electrode lead 15 is welded to the case 1.

In one embodiment, the side walls of the casing 1 include a first side wall 16, a second side wall 17, a third side wall (not shown) and a fourth side wall (not shown) which are connected in sequence, and the positive electrode lead 13, the liquid injection hole 14 and the negative electrode lead 15 are disposed on the first side wall 16.

In one embodiment, the thickness of the flange 21 is 0-1.5mm and the height of the flange 21 is 0-5 mm.

The distance between the flange 21 and the edge of the cover plate 2 is 0-5mm, and the width of the extension part 12 is 0-5 mm.

In an embodiment, the outer edge of the cover plate 2 is square, the outer edge of the extension portion 12 is aligned with the outer edge of the cover plate 2 or the outer edge of the extension portion 12 protrudes from the outer edge of the cover plate 2. Preferably, the outer edge of the extension portion 12 protrudes beyond the outer edge of the cover plate 2, so that the welding is performed directly along the outer edge of the cover plate 2 during welding, and the welding quality is guaranteed.

In one embodiment, the housing 1 is a steel shell.

The shell subassembly that this application embodiment provided, the opening edge of casing is provided with outside extension portion, extension portion protrusion in the lateral wall of casing, the apron orientation be provided with on the side of casing to the convex flange of casing, the lateral surface of flange with the internal surface butt of the lateral wall of casing, the outward flange of apron with the welding of extension portion laminating. The utility model provides a shell subassembly, the flange can play prepositioning's effect to the apron, and when the outward flange of apron was laminated with the extension and is welded, the apron can not become flexible, improves welding quality.

In addition, as shown in fig. 2 to fig. 3, an embodiment of the present application further provides a lithium battery, which includes a pole piece 200 and the housing assembly 100 of the above embodiment, wherein the pole piece 200 is disposed in the accommodating cavity 11, and the flange 21 abuts against an upper surface of the pole piece 200.

In one embodiment, the accommodating cavity 11 is a square cavity, and the pole piece 200 is square.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An outer casing component is characterized by comprising a casing and a cover plate, wherein the casing is of a square structure with one open end, an accommodating cavity for accommodating a pole core is formed in the casing, and the cover plate is buckled at the open end of the casing;

2. The housing assembly of claim 1, wherein the housing has a positive electrode lead, a liquid injection hole, and a negative electrode lead disposed on a side wall thereof.

3. The housing assembly of claim 2, wherein the positive lead, the injection hole, and the negative lead are located on the same side of the sidewall, and the positive lead is located between the injection hole and the negative lead.

4. The housing assembly of claim 2, wherein the positive electrode guide piece comprises a rivet and an insulating sealing element, a mounting hole is formed in a side wall of the housing, the insulating sealing element is connected between a hole wall of the mounting hole and an outer peripheral surface of the rivet in a sealing manner, an inner end of the rivet extends into the accommodating cavity of the housing and is connected with a positive electrode tab of the electrode core, and an outer end of the rivet extends out of the side wall of the housing;

the negative electrode guide sheet is welded on the shell.

5. The housing assembly of claim 2, wherein the side walls of the case include a first side wall, a second side wall, a third side wall, and a fourth side wall connected in series, and the positive electrode lead, the electrolyte injection hole, and the negative electrode lead are disposed on the first side wall.

6. The enclosure assembly of claim 1, wherein the flange has a thickness of 0-1.5mm and a height of 0-5 mm;

7. The housing assembly of claim 1, wherein an outer edge of the cover plate is square, and an outer edge of the extension aligns with or projects beyond an outer edge of the cover plate.

8. The enclosure assembly of claim 1, wherein the housing is a steel shell.

9. A lithium battery comprising a pole piece and the housing assembly of any of claims 1-8, the pole piece being disposed within the receiving cavity, the flange abutting an upper surface of the pole piece.

10. The lithium battery of claim 9, wherein the receiving cavity is a square cavity and the pole piece is square.