CN211605200U - Button type lithium secondary battery case structure - Google Patents

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

A button-type lithium secondary battery shell structure

technical field

The utility model relates to a lithium ion battery, in particular to a button-type lithium secondary battery shell structure.

Background technique

Lithium-ion battery is a kind of rechargeable battery, which mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to convert chemical energy into electrical energy. It has the advantages of high energy density, no memory effect, etc. applied to 3C products, such as smart phones and tablet computers.

For example, Chinese Patent No. CN 1178325 "Button-shaped accumulator and its production method" includes an outer casing, a casing cover, an insulating gasket and an electrode assembly, and the outer casing and the casing cover pass through the insulating gasket connected, and the electrode assembly is disposed in the outer casing and the outer casing cover and has a positive electrode and a negative electrode.

Generally speaking, the outer casing and the outer casing cover are used as positive and negative electrodes, respectively, and are made of metal. Metal has high strength and can provide good protection when the battery is in good condition. Factors such as overcharge or overdischarge, high temperature environment and internal short circuit will cause the metal to collapse quickly and explode once the expansion exceeds the yield strength of the metal, which increases safety concerns. In addition, the shell cover is made by mechanical processing, such as stamping and drawing, and precision turning, and the edge is bent inward by mechanical forming to form a curling edge, so as to press and fix the insulating gasket to seal the shell body, but it is necessary to bend a circular shape. The continuous edge requires a large mechanical bending force, and the curling edge is prone to springback due to metal elasticity, resulting in uneven curling and stress concentration problems, which are prone to leak points.

Utility model content

The main purpose of the present invention is to solve the problem that the conventional shells are prone to leak points and have the risk of explosion.

In order to achieve the above purpose, the present invention provides a button-type lithium secondary battery casing structure, which includes a metal lower casing, an insulating rubber ring and a metal upper casing, wherein the metal lower casing has a bottom surface, a 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 A curling edge, the inner ring surface is adjacent to the opening, the curling edge is close to the opening and is bent inward, and the curling edge has at least one notch.

The insulating rubber ring is inserted into the inner ring surface, the metal upper shell has a top surface and a cap edge, the cap edge is connected to the top surface, and the cap edge is spaced from the insulating rubber ring and clamped into the inner ring surface The accommodating space is sealed, and the insulating rubber ring is pressed by the crimping.

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

1. The curling edge is provided with the at least one notch, so the complete structure of the curling edge is cut by the at least one notch to reduce the structural strength, which can reduce the force required for mechanical bending and improve the reliability of the curling edge bending, The springback of the bead is avoided, and the tightness can be increased.

2. The structural strength of the casing 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. When the lithium secondary battery expands, it can be partially deformed Relieve pressure to avoid explosion.

Description of drawings

FIG. 1 is a three-dimensional appearance view of the utility model.

Figure 2 is a front view of the utility model.

Figures 3A-3C are drawings showing various numbers of implementations of notches of the present invention.

FIG. 4 is a dimension diagram of the metal lower casing of the present invention.

5A-5F are implementation views of various shapes of the notch of the present invention.

Among them, reference numerals:

Metal lower case 10

Bottom 11

Ring wall 12

Inner ring 121

Crimping 122

Notch 123

accommodating space 13

opening 14

Insulating rubber ring 20

Metal upper case 30

Top 31

brim 32

Width dimension W

Diameter dimension D

Depth dimension L

Height dimension H

Detailed ways

The detailed description and technical content of the present utility model are now described as follows in conjunction with the accompanying drawings:

Please refer to FIG. 1 , FIG. 2 and FIG. 3A , the present invention provides a button-type lithium secondary battery case structure, which includes a metal lower case 10 , an insulating rubber ring 20 and a metal upper case 30 , The metal lower case 10 has a bottom surface 11 , an annular wall 12 , an accommodating space 13 and an opening 14 . The annular wall 12 surrounds and connects the bottom surface 11 , and the accommodating space 13 is surrounded by the annular wall 12 . The opening 14 is connected to the accommodating space 13 , and the annular wall 12 has an inner annular surface 121 and a curling edge 122 . The inner annular surface 121 is adjacent to the opening 14 , and the curling edge 122 is adjacent to the opening 14 and is bent inward. folded, and the curling edge 122 has at least one notch 123 .

The insulating rubber ring 20 is inserted into the inner ring surface 121. The insulating rubber ring 20 can be a composite part formed by polymer injection molding on the metal upper shell 30; or an independent part formed by injection molding, and then inserted into The inner ring surface 121 ; the metal upper shell 30 has a top surface 31 and a cap edge 32 , the cap edge 32 is connected to the top surface 31 , and the cap edge 32 is spaced from the insulating rubber ring 20 and clamped into the inner ring The accommodating space 13 is sealed by the surface 121 , and the insulating rubber ring 20 is pressed by the curling edge 122 .

The accommodating space 13 is for arranging lithium battery components (not shown), including a lithium battery, a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode; the lithium battery After the first electrode and the second electrode of the core part are electrically connected to the metal lower case 10 and the metal upper case 30 respectively, the electrolyte is injected into the accommodating space 13 where the lithium battery has been installed, and the operation is carried out. In the sealing and assembling process, the accommodating space 13 is sealed and charged and formed, and the production of the button-type lithium secondary battery can be completed.

Please refer to FIG. 3A , FIG. 3B and FIG. 3C again, which are implementation views of various numbers of the slots 123 . 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 notches 123 can be changed according to the needs of use, and other numbers can be used besides the number of the openings. Preferably, the at least one slot 123 is evenly distributed on the curling edge 122 , that is, the at least one slot 123 is equally distributed on the curling edge 122 .

Also, please refer to FIGS. 3A and 4 again, in the actual implementation structure, the height dimension range of the at least one slot 123 is not fixed, and may be between the bottom position of the inner ring surface 121 and the position of the opening 14 . any height, and the structural width of the at least one slot 123 is not fixed. More specifically, the width dimension W of the at least one slot 123 is smaller than the diameter dimension D of the metal lower case 10, and the at least one slot The depth dimension L of the port 123 is smaller than the height dimension H of the metal lower case 10 .

Please refer to FIGS. 5A-5F again, which are the shape diagrams of various embodiments of the notch of the present invention. The shape of the at least one notch 123 on the metal lower casing 10 may be a triangle, a square, an arc, Trapezoid, conical and irregular shapes, etc., are selected according to the design of the slot 123 to withstand strength and appearance requirements. As shown in FIGS. 5A-5F , various implementation diagrams are disclosed, but not limited thereto.

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

1. The curling edge is provided with the at least one notch, so the complete structure of the curling edge is cut by the at least one notch to reduce the structural strength, which can reduce the force required for mechanical bending and improve the reliability of the curling edge bending, Avoiding the spring back of this bead increases sealing.

2. The structural strength of the casing 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. When the lithium secondary battery expands, it can be partially deformed Relieve pressure to avoid explosion.

3. The production process has not changed, no need to increase or decrease the processing program, and no need to modify the shape or size of the mold, it can be applied. There is no need to change the size of the product, the maximum size is unchanged, the specifications and functions are also unchanged, and there is no need to redesign the product.

Of course, the present utility model can also have other various embodiments, without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model, but These corresponding changes and deformations shall belong to the protection scope defined by the appended claims of the present utility model.

Claims (4)

1. a button-type lithium secondary battery shell structure, is characterized in that, comprises: A metal lower case, the metal lower case has a bottom surface, a ring wall surrounding and connecting the bottom surface, an accommodating space surrounded by the ring wall, and an opening connecting the accommodating space, and the ring wall has an inner ring surface adjacent to the opening and a curling edge close to the opening and bent inward, the curling edge has at least one notch; an insulating rubber ring, the insulating rubber ring is inserted into the inner ring surface; and a metal upper shell, and the metal upper shell has a top surface and a cap edge surrounding the top surface, and the cap edge is spaced by the insulating rubber ring and clamped into the inner ring surface to seal the accommodating space, and The insulating rubber ring is pressed by the crimping. 2 . The case structure for a button-type lithium secondary battery according to claim 1 , wherein the notches are plural and evenly distributed on the curling edge. 3 . 3 . The case structure of the button-type lithium secondary battery according to claim 1 , wherein the structural shape of the at least one notch is selected from the group consisting of triangle, square, arc, trapezoid, cone and irregular shape. 4 . either. 4 . The case structure of claim 1 , wherein the width dimension of the at least one slot is smaller than the diameter dimension of the metal lower case, and the depth dimension of the at least one slot is 4 . smaller than the height dimension of the metal lower case.

Images