CN211605200U

CN211605200U - Button type lithium secondary battery case structure

Info

Publication number: CN211605200U
Application number: CN202020443319.2U
Authority: CN
Inventors: 施凯胜; 蔡金皇; 赖秀菱
Original assignee: Synergy Scientech Corp
Current assignee: Synergy Scientech Corp
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-09-29
Anticipated expiration: 2030-03-31

Abstract

The utility model discloses a knot formula lithium secondary battery shell structure for encapsulate a lithium secondary battery, include a metal lower casing, an insulating rubber ring and a metal upper casing, wherein the metal lower casing has a bottom surface, a rampart of connecting this bottom surface is encircleed, an accommodation space that surrounds out by this rampart and an opening of connecting this accommodation space, and this rampart has an interior anchor ring of neighbouring this opening and a turn-up that is close to this opening, this turn-up has an at least notch, this insulating rubber ring is put into this interior anchor ring, and this metal upper casing has a top surface and a cap edge of connecting this top surface of encircleing, and this insulating rubber ring card of this cap edge interval is gone into this interior anchor ring and is sealed this accommodation space, and suppress this insulating rubber ring through this turn-up of buckling inwards and strengthen sealed effect; the lithium secondary battery can be arranged in the accommodating space, the curled edge is prevented from rebounding through the arrangement of the at least one notch, and meanwhile, a pressure relief structure is formed, so that the sealing effect can be enhanced, and the explosion-proof effect is achieved.

Description

Button type lithium secondary battery case structure

Technical Field

The utility model relates to a lithium ion battery especially relates to a knot formula lithium secondary battery shell structure.

Background

A Lithium-ion battery (Lithium-ion battery) is a rechargeable battery, which mainly works by converting chemical energy into electric energy by means of Lithium ion movement between a positive electrode and a negative electrode, has the advantages of high energy density, no memory effect and the like, and is widely applied to 3C products such as smart phones, tablet computers and the like.

For example, chinese patent No. CN 1178325, "button-shaped storage battery and method for manufacturing the same," includes a case body, a case cover, an insulating gasket, and an electrode assembly, where the case body and the case cover are connected through the insulating gasket, and the electrode assembly is disposed in the case body and the case cover and has a positive electrode and a negative electrode.

Generally, the casing and the casing cover are made of metal as a positive electrode and a negative electrode, respectively, and the metal has a high strength characteristic and can provide good protection when the battery state is good, but when the external protection plate of the battery fails, improper overcharge or overdischarge, a high temperature environment, internal short circuit and other factors cause expansion once exceeding the yield strength of the metal, the metal is rapidly collapsed, so that the problem of explosion is caused, and the safety is raised. In addition, the housing cover is formed by mechanical processing, such as stamping, drawing and precise lathing, and the edge is bent inwards to form a curled edge by mechanical forming so as to press and fix the insulating gasket to seal the housing body.

SUMMERY OF THE UTILITY MODEL

The main purpose of the present invention is to solve the problem that the conventional shell is easy to generate leakage point and has explosion risk.

To achieve the above object, the present invention provides a buckle-type lithium secondary battery casing structure, which comprises a metal lower casing, an insulating rubber ring and a metal upper casing, wherein the metal lower casing has a bottom surface, a ring wall, an accommodating space and an opening, the ring wall surrounds and connects the bottom surface, the accommodating space is surrounded by the ring wall, and the opening connects the accommodating space, and the ring wall has an inner ring surface and a curled edge, the inner ring surface is adjacent to the opening, the curled edge is adjacent to the opening and is bent inwards, and the curled edge has at least one notch.

The insulating rubber ring is arranged in the inner ring surface, the metal upper shell is provided with a top surface and a cap edge, the cap edge is connected with the top surface in a surrounding mode, the cap edge is clamped into the inner ring surface at intervals to seal the accommodating space, and the insulating rubber ring is pressed through the curled edge.

To sum up, the utility model has the following characteristics:

first, the crimp is provided with the at least one notch, so that the complete structure of the crimp is cut by the at least one notch to reduce the structural strength, reduce the force required for mechanical bending, improve the reliability of bending of the crimp, avoid the crimp from rebounding, and increase the sealing property.

And secondly, the structural strength of the shell can be changed by adjusting the size of the at least one notch, so that a controllable pressure relief opening is formed at the at least one notch, and when the lithium secondary battery has an expansion phenomenon, the lithium secondary battery can be locally deformed to relieve pressure to avoid explosion.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3A-3C are various numbers of notches according to the present invention.

Fig. 4 is a dimension indicating diagram of the lower metal shell of the present invention.

Fig. 5A-5F are various shapes of the notch according to the present invention.

Wherein, the reference numbers:

metal lower case 10

Bottom surface 11

Surrounding wall 12

Inner ring surface 121

Hems 122

Notch 123

Accommodating space 13

Opening 14

Insulating rubber ring 20

Metal upper case 30

Top surface 31

Cap rim 32

Width dimension W

Diameter dimension D

Depth dimension L

Height dimension H

Detailed Description

The detailed description and technical contents of the present invention will now be described with reference to the accompanying drawings as follows:

referring to fig. 1, fig. 2 and fig. 3A, the present invention provides a buckle-type lithium secondary battery case structure, which includes a metal lower case 10, an insulating rubber ring 20 and a metal upper case 30, wherein the metal lower case 10 has a bottom surface 11, a ring wall 12, an accommodating space 13 and an opening 14, the ring wall 12 is connected to the bottom surface 11 in a surrounding manner, the accommodating space 13 is surrounded by the ring wall 12, the opening 14 is connected to the accommodating space 13, the ring wall 12 has an inner ring surface 121 and a curled edge 122, the inner ring surface 121 is adjacent to the opening 14, the curled edge 122 is adjacent to the opening 14 and is bent inward, and the curled edge 122 has at least one notch 123.

The insulating rubber ring 20 is disposed in the inner annular surface 121, and the insulating rubber ring 20 may be a composite member formed on the metal upper shell 30 by polymer injection molding; or an independent part formed by injection molding is inserted into the inner annular surface 121; the metal upper shell 30 has a top surface 31 and a cap rim 32, the cap rim 32 is connected around the top surface 31, and the cap rim 32 is inserted into the inner annular surface 121 at an interval of the insulating rubber ring 20 to seal the accommodating space 13, and the insulating rubber ring 20 is pressed by the curled edge 122.

The accommodating space 13 is for accommodating a lithium battery component (not shown), and includes a lithium battery cell, a first electrode, a second electrode, and a diaphragm disposed between the first electrode and the second electrode; after the first electrode and the second electrode of the lithium battery cell are electrically connected with the metal lower shell 10 and the metal upper shell 30 respectively, electrolyte is injected into the accommodating space 13 in which the lithium battery cell is arranged, the assembly process is sealed, the accommodating space 13 is sealed and charged, and the manufacturing of the button type lithium secondary battery can be completed.

Referring again to fig. 3A, 3B and 3C, various numbers of the slots 123 are shown. As shown in fig. 3A, the number of the notches 123 is 8; as shown in fig. 3B, the number of the notches 123 is 3; as shown in fig. 3C, the number of the notches 123 is 4. The number of the slots 123 may be changed according to the requirement of the application, and other numbers besides the number mentioned above are also possible. Preferably, the at least one notch 123 is evenly distributed on the curling edge 122, that is, the at least one notch 123 is equally circumferentially distributed on the curling edge 122.

As shown in fig. 3A and fig. 4, in an actual implementation structure, the height dimension of the at least one notch 123 is not limited, and may be any height from the bottom of the inner annular surface 121 to the position of the opening 14, and the structural width of the at least one notch 123 is not limited, specifically, the width dimension W of the at least one notch 123 is smaller than the diameter dimension D of the metal lower shell 10, and the depth dimension L of the at least one notch 123 is smaller than the height dimension H of the metal lower shell 10.

Referring to fig. 5A-5F, which are various shape diagrams of the notch according to the present invention, the shape of the at least one notch 123 on the metal lower shell 10 can be triangular, square, arc, trapezoid, cone, irregular shape, etc. and is selected according to the designed bearable strength and appearance requirement of the notch 123. As shown in fig. 5A-5F, various embodiments are disclosed, but not limited thereto.

To sum up, the utility model has the following characteristics:

firstly, the curling edge is provided with the at least one notch, so that the complete structure of the curling edge is cut off by the at least one notch, the structural strength is reduced, the force required by mechanical bending can be reduced, the bending reliability of the curling edge is improved, the rebounding of the curling edge is avoided, and the sealing property is improved.

And thirdly, the production process is not changed, the processing procedure is not required to be increased or decreased, and the shape or the size of the die is not required to be modified, so that the die can be manufactured. The size of the product is not required to be changed, the maximum size is not changed, the specification function is not changed, and the product is not required to be redesigned.

Naturally, the present invention can be implemented in other various embodiments, and various changes and modifications can be made by those skilled in the art without departing from the spirit and the essence of the present invention, but these changes and modifications should fall within the scope of the present invention defined by the appended claims.

Claims

1. A button-type lithium secondary battery shell structure is characterized by comprising:

a metal lower shell, the metal lower shell has a bottom surface, a ring wall connected with the bottom surface in a surrounding way, an accommodating space surrounded by the ring wall and an opening connected with the accommodating space, the ring wall has an inner ring surface adjacent to the opening and a curled edge which is adjacent to the opening and is bent inwards, and the curled edge has at least one notch;

an insulating rubber ring, which is arranged in the inner ring surface; and

and the metal upper shell is provided with a top surface and a cap edge which is connected with the top surface in a surrounding way, the cap edge is clamped into the inner ring surface at intervals to seal the accommodating space, and the insulating rubber ring is pressed through the curled edge.

2. The button lithium secondary battery case structure according to claim 1, wherein the notches are formed in a plurality and are evenly distributed on the beading.

3. The button type lithium secondary battery case structure according to claim 1, wherein the at least one notch has a structural shape selected from any one of a triangular shape, a square shape, an arc shape, a trapezoidal shape, a tapered shape and an irregular shape.

4. The button lithium secondary battery case structure according to claim 1, wherein the width dimension of the at least one notch is smaller than the diameter dimension of the metal lower case, and the depth dimension of the at least one notch is smaller than the height dimension of the metal lower case.