CN211629140U

CN211629140U - Button type secondary battery sealing shell

Info

Publication number: CN211629140U
Application number: CN202020490956.5U
Authority: CN
Inventors: 许德胜; 曾玉祥
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2020-10-02
Anticipated expiration: 2030-04-07

Abstract

A button type secondary battery sealing shell belongs to the technical field of lithium ion batteries. The utility model aims at solving the poor problem of current button cell leakproofness, sealed casing includes the metal body one, body and lower cover, the body includes insulator one, metal body two, two lower parts of metal body are opened, metal body two with an insulator upper portion has the concentric hole, metal body one covers the concentric hole, just metal body one is located metal body two with in the cavity that the lower cover formed, insulator one is located metal body one with between the metal body two, the lower cover is metallic conductor. The utility model is divided into a main body and a lower cover structure which are combined through a sealing necking; the positive and negative electrode shells are not easy to short circuit in the buckling assembly process of the shells; after the metal part stamping forming in the main part, the rethread is moulded plastics and is glued together, guarantees the precision, combines closely, reduces later stage electricity core assembly process, improves electric core performance.

Description

Button type secondary battery sealing shell

Technical Field

The utility model belongs to the technical field of lithium ion battery, concretely relates to button type secondary battery seal shell.

Background

With the development and progress of science and technology, the market demand for wearable devices, such as wireless earphones, sports watches, bracelets, rings and other electronic products, is increasing day by day, and is limited by the development and market demand of the industrial manufacturing level, the button cell batteries in the market at present mainly comprise primary battery, secondary button lithium ion batteries are not sold in the market basically, and such miniaturized products have higher requirements for the space size of battery products. Due to the reduction of the battery size and the improvement of the requirement on the size consistency, the soft package battery provides a huge challenge to the processing capacity. The steel shell battery (also called button battery) has the advantages of a far-super soft-package battery in the aspect of size consistency, and better meets the positioning and the requirements of the market and customers on the micro battery. However, the button cell in the current market has the problems of complex structure and poor sealing performance and safety, and under the background demand, the sealing shell for the button cell needs to be provided urgently to meet the demand of the majority of users.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the poor problem of current button cell leakproofness, provide a button secondary cell seal shell, this seal shell simple structure has fine sealing performance, can improve battery security and life, and is effectual.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a button type secondary battery sealing shell comprises a first metal body, a body and a lower cover, wherein the body comprises a first insulator and a second metal body, the lower part of the second metal body is open, the upper parts of the second metal body and the first insulator are provided with concentric holes, the first metal body covers the concentric holes, the first metal body is positioned in a cavity formed by the second metal body and the lower cover, the first insulator is positioned between the first metal body and the second metal body, and the lower part of the second metal body is sealed through the lower cover; the lower cover is a metal conductor.

The utility model discloses beneficial effect for prior art does:

1. the shell is divided into a main body and a lower cover structure which are combined through a sealing necking;

2. the positive and negative electrode shells are not easy to short circuit in the buckling assembly process of the shells;

3. after the metal part stamping forming in the main part, the rethread is moulded plastics and is glued together, guarantees the precision, combines closely, reduces later stage electricity core assembly process, improves electric core performance.

Drawings

FIG. 1 is a schematic view of the split structure of the main body and the lower cover of the present invention;

FIG. 2 is a schematic view of a seal housing with a lower cap necked down;

fig. 3 is a schematic view of a sealed case of embodiment 3.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples, but not limited thereto, and all modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit of the technical solution of the present invention, and all the modifications and substitutions are intended to be covered by the scope of the present invention.

The first embodiment is as follows: the embodiment describes a button type secondary battery sealing shell, which comprises a first metal body 1-1, a body and a lower cover 2, wherein the body comprises a first insulator 1-2 and a second metal body 1-4, the lower part of the second metal body 1-4 is open, the upper parts of the second metal body 1-4 and the first insulator 1-2 are provided with concentric holes, the first metal body 1-1 covers the concentric holes, the first metal body 1-1 is positioned in a cavity formed by the second metal body 1-4 and the lower cover 2, the first insulator 1-2 is positioned between the first metal body 1-1 and the second metal body 1-4, and the lower part of the second metal body 1-4 is sealed by the lower cover 2; a cavity is formed inside the lower cover 2 and the second metal body 1-4 and used for accommodating a battery; the lower cover 2 is a metal conductor. The person skilled in the art can use the dispensing to further seal the part where the sealing is not good according to experience. The utility model discloses an innovation point lies in mutually supporting between the three layer construction (the metal body one, insulator one, metal body two) through the upper cover promptly, realizes better sealed effect. The body is obtained by an adhesion or injection molding process; firstly, preparing a first metal body 1-1, a first insulator 1-2 and a second metal body 1-4, and then bonding the first metal body, the first insulator and the second metal body through glue; or preparing the first metal body 1-1 and the second metal body 1-4, and then preparing the body with the insulating material by using a mold through an injection molding machine, wherein the first metal body 1-1 and the second metal body 1-4 are not in contact in the formed body.

The second embodiment is as follows: in a first specific embodiment, the first metal body 1-1 has a boss, the second metal body 1-4 is sleeved on the first metal body 1-1, and the boss of the first metal body 1-1 is located in the range of the upper opening of the second metal body 1-4.

The third concrete implementation mode: in the first embodiment, the body further comprises a second insulator 1-3, two ends of the second insulator 1-3 are open, and the second insulator 1-3 is sleeved outside the second metal body 1-4; the lower cap 2 includes an annular sidewall. The insulator II 1-3 is matched with the cylindrical lower cover to achieve a better sealing effect.

The fourth concrete implementation mode: in the sealing case of the button-type secondary battery according to the third embodiment of the present invention, the upper portion of the lower cover 2 is provided with a necking portion and is hermetically connected to the second metal body 1-4. During assembly, the lower cover 2 is sleeved into the body and is sealed by the necking, the sealing effect is good, and short circuit caused by the necking can be avoided.

The fifth concrete implementation mode: in the second embodiment, the distance between the protruding part of the boss and the second metal body 1-4 is 5-20mm, specifically, the distance between the protruding part and the top wall of the second metal body 1-4, and experiments prove that when the distance is 5-20mm, the sealing effect is better, the embedding effect between the three layers of the structure on the upper part of the casing is better, the size of the protruding part is not too small, and the casing is easy to process. The distance between the first metal body 1-1 and the second metal body 1-4 is 3-10mm, and specifically, the distance can be properly adjusted according to the boss. The metal body 1-1 can be in a disc shape and the like, and the regular shape is easy to process and assemble and convenient to operate.

The sixth specific implementation mode: in the first embodiment of the present invention, after the casing is assembled, in a projection onto the lower cover 2, the first metal body 1-1 and the second metal body 1-4 have an overlapping portion, a first insulator is further included between the first metal body and the second metal body, and a top portion of the sealed casing has a three-layer structure, so that the sealing performance inside the sealed casing is ensured.

The seventh embodiment: in the seal case of a button-type secondary battery according to the sixth embodiment, the area of the overlapping portion occupies 10% to 30% of the area of 1 to 1 of the first metal body. Experiments prove that 10% -30% of the overlapping area is found, the effect of the sealing shell is optimal, the service life is longest, and the situation of poor sealing is avoided.

The specific implementation mode is eight: in a first embodiment of the sealed casing of the button-type secondary battery, an outer periphery of the first metal body 1-1 is bent upward, an inner periphery of a central hole of the second metal body 1-4 is bent downward, and an upper end surface of the second metal body 1-4 is flush with an upper end surface of the first metal body 1-1. The embodiment further increases the pressure resistance of the metal cover through the structural design similar to the barb, and enables the upper end face of the second metal body 1-4 to be flush with the upper end face of the boss of the first metal body 1-1, so that the consistency of the sealed shell is ensured.

The specific implementation method nine: in the first embodiment of the sealed case of the button-type secondary battery, the body and the lower cover 2 are sealed by laser welding, so that the sealing performance is further improved.

The detailed implementation mode is ten: in the first embodiment, the lower part of the second metal body 1-4 is sealed with the lower cover 2 by a combination of laser welding and dispensing, that is, the second metal body 1-4 and the lower cover 2 are first laser welded, and then dispensing is performed at a position where poor sealing performance may exist to further seal, thereby ensuring sealing performance.

Example 1:

a button type secondary battery sealing shell is disclosed, as shown in figure 1, the sealing shell comprises a first metal body 1-1, a body and a lower cover 2, the body comprises a first insulator 1-2 and a second metal body 1-4, the lower part of the second metal body 1-4 is open, the upper parts of the second metal body 1-4 and the first insulator 1-2 are provided with concentric holes, the first metal body 1-1 covers the concentric holes, the first metal body 1-1 is positioned in a cavity formed by the second metal body 1-4 and the lower cover 2, the first insulator 1-2 is positioned between the first metal body 1-1 and the second metal body 1-4, the two metal bodies are arranged in an insulating way, and the lower part of the second metal body 1-4 is sealed through the lower cover 2; a cavity is formed inside the lower cover 2 and the second metal body 1-4 and used for accommodating a battery; the lower cover 2 is a metal conductor. The metal body I1-1 is disc-shaped and provided with a boss, and the regular shape is easy to process and assemble and convenient to operate; the second metal body 1-4 is sleeved on the first metal body 1-1, and the boss of the first metal body 1-1 is positioned in the range of the upper opening of the second metal body 1-4. The body further comprises an insulator II 1-3, the insulator II 1-3 is a cylinder with two open ends, and the insulator II 1-3 is sleeved outside the metal body II 1-4; the lower cover 2 is a cylindrical structure with an upper opening. The insulator II 1-3 is matched with the cylindrical lower cover to achieve a better sealing effect. The body is obtained through an injection molding process, namely, the first metal body 1-1 and the second metal body 1-4 are prepared firstly, then the body is prepared with an insulating material through an injection molding machine by using a mold, and the first metal body 1-1 and the second metal body 1-4 in the formed body are not contacted. The sealing effect of this embodiment is better, does not have weeping scheduling problem.

Example 2:

as shown in FIG. 2, in this embodiment, on the basis of embodiment 1, a necking is arranged on the upper portion of the lower cover 2 and is connected with the second metal body 1-4 in a sealing manner. During assembly, the lower cover 2 is sleeved into the body and is sealed by the necking, the sealing effect is good, and short circuit caused by the necking can be avoided.

Example 3:

a sealed shell of a button type secondary battery is disclosed, as shown in figure 3, the sealed shell comprises a first metal body 1-1, a body and a lower cover 2, the body comprises a first insulator 1-2 and a second metal body 1-4, the lower part of the second metal body 1-4 is open, the upper parts of the second metal body 1-4 and the first insulator 1-2 are provided with concentric holes, the first metal body 1-1 covers the concentric holes, the first metal body 1-1 is positioned in a cavity formed by the second metal body 1-4 and the lower cover 2, the first insulator 1-2 is positioned between the first metal body 1-1 and the second metal body 1-4, the two metal bodies are arranged in an insulating way, and the lower part of the second metal body 1-4 is sealed by the lower cover 2; a cavity is formed inside the lower cover 2 and the second metal body 1-4 and used for accommodating a battery; the lower cover 2 is a metal conductor. The metal body I1-1 is disc-shaped and provided with a boss, and the regular shape is easy to process and assemble and convenient to operate; the second metal body 1-4 is sleeved on the first metal body 1-1, and the boss of the first metal body 1-1 is positioned in the range of the upper opening of the second metal body 1-4. The outer periphery of the disc of the first metal body 1-1 is provided with a first outer edge protruding upwards, the first outer edge is connected with the outer periphery of the disc of the first metal body 1-1 through a first conical surface, the inner circumferential surface of the central hole of the second metal body 1-4 is provided with a second outer edge protruding downwards, the second outer edge is connected with the inner circumferential surface of the central hole of the second metal body 1-4 through a second conical surface, and the upper end face of the second metal body 1-4 is flush with the upper end face of the boss of the first metal body 1-1. In the embodiment, the pressure resistance of the metal cover is further improved through the structural design similar to the barb, the upper end surface of the metal body II 1-4 is flush with the upper end surface of the boss of the metal body I1-1, and the consistency of the prepared sealing shell is ensured; the body and the lower cover 2 are sealed through laser welding, and the sealing performance is further improved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other forms of embodiment without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A button type secondary battery seal shell is characterized in that: the sealed shell comprises a first metal body (1-1), a body and a lower cover (2), wherein the body comprises a first insulator (1-2) and a second metal body (1-4), the lower part of the second metal body (1-4) is open, the upper parts of the second metal body (1-4) and the first insulator (1-2) are provided with concentric holes, the first metal body (1-1) covers the concentric holes, the first metal body (1-1) is positioned in a cavity formed by the second metal body (1-4) and the lower cover (2), the first insulator (1-2) is positioned between the first metal body (1-1) and the second metal body (1-4), and the lower part of the second metal body (1-4) is sealed through the lower cover (2); the lower cover (2) is a metal conductor.

2. A sealed casing of a button-type secondary battery according to claim 1, characterized in that: the first metal body (1-1) is provided with a boss, the second metal body (1-4) is sleeved on the first metal body (1-1), and the boss of the first metal body (1-1) is positioned in the range of the upper opening of the second metal body (1-4).

3. A sealed casing of a button-type secondary battery according to claim 1, characterized in that: the body further comprises a second insulator (1-3), two ends of the second insulator (1-3) are open, and the second insulator (1-3) is sleeved on the outer side of the second metal body (1-4); the lower cover (2) comprises an annular side wall.

4. A sealed casing of a button-type secondary battery according to claim 3, characterized in that: the upper part of the lower cover (2) is provided with a necking and is connected with the second metal body (1-4) in a sealing way.

5. A sealed casing of a button-type secondary battery according to claim 2, characterized in that: the nearest distance between the convex part of the boss and the second metal body (1-4) is 5-20 mm.

6. A sealed casing of a button-type secondary battery according to claim 1, characterized in that: after the shell is assembled, the first metal body (1-1) and the second metal body (1-4) have an overlapping part on the projection of the lower cover (2).

7. The sealed casing of button type secondary battery as defined in claim 6, wherein: the area of the overlapping part accounts for 10-30% of the area of the first metal body (1-1).

8. A sealed casing of a button-type secondary battery according to claim 1, characterized in that: the outer periphery of the first metal body (1-1) is bent upwards, the inner periphery of the central hole of the second metal body (1-4) is bent downwards, and the upper end face of the second metal body (1-4) is flush with the upper end face of the first metal body (1-1).

9. A sealed casing of a button-type secondary battery according to claim 1, characterized in that: the body and the lower cover (2) are sealed through laser welding.

10. A sealed casing of a button-type secondary battery according to claim 1, characterized in that: the lower part of the second metal body (1-4) is sealed with the lower cover (2) in a mode of combining laser welding and dispensing.