CN211350699U

CN211350699U - Button cell and shell for button cell

Info

Publication number: CN211350699U
Application number: CN202020210845.4U
Authority: CN
Inventors: 汪小林; 袁卉军; 龙翔; 张国民; 党海涛; 简爱军
Original assignee: Jiangxi Beiteli New Energy Co ltd
Current assignee: Jiangxi Beiteli New Energy Co ltd
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2020-08-25
Anticipated expiration: 2030-02-25

Abstract

The utility model relates to a button cell and a shell for the button cell, which comprises an upper cover and a lower cover assembled with the upper cover; the upper cover comprises a first cover body and a first opening arranged at one end of the first cover body; one end of the first cover body, which is far away from the opening, is arranged corresponding to the negative electrode of the button cell; the lower cover comprises a second cover body sleeved on the periphery of the first cover body and a second opening arranged at one end of the first cover body; one end of the second cover body, which is far away from the second opening, is arranged corresponding to the anode of the button cell; the shell further comprises an explosion-proof structure which is formed by stretching and forming on the outer end face of one end, far away from the first opening, of the first cover body and/or the outer end face of one end, far away from the second opening, of the second cover body. The shell for the button cell can realize explosion prevention in the using process and under abnormal conditions, so that the safety performance of the button cell can be improved, and the personal safety of a user is protected.

Description

Button cell and shell for button cell

Technical Field

The utility model relates to a lithium cell field, more specifically say, relate to a button cell and be used for button cell's shell.

Background

With the development of various electronic devices, lithium batteries have the advantages of high voltage, small size, high energy density, good cycle performance and the like, so that the lithium batteries are more and more widely applied and are more and more in demand. Simultaneously miniature button lithium cell also receives the favor of each trade, like intelligent wearing equipment battery, like products such as TWS bluetooth headset, motion bracelet all have button cell, but lithium cell safety problem is an important topic of everybody's concern always, the user is zero defect to the explosion safety requirement of starting a fire of product, and button cell shell among the correlation technique shell stretch forming back upper and lower smooth surface, do not possess explosion-proof structure usually, consequently, use for the user easily and bring some potential safety hazards, can't satisfy the user to the demand of product safety.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing one kind can realize in the use and explosion-proof shell that is used for button cell under abnormal situation, further provides a button cell.

The utility model provides a technical scheme that its technical problem adopted is: constructing a shell for a button cell, comprising an upper cover and a lower cover assembled with the upper cover;

the upper cover comprises a first cover body and a first opening arranged at one end of the first cover body; one end of the first cover body, which is far away from the opening, is arranged corresponding to the negative electrode of the button cell;

the lower cover comprises a second cover body sleeved on the periphery of the first cover body and a second opening arranged at one end of the first cover body; one end of the second cover body, which is far away from the second opening, is arranged corresponding to the anode of the button cell;

the shell further comprises an explosion-proof structure which is formed by stretching and forming on the outer end face of one end, far away from the first opening, of the first cover body and/or the outer end face of one end, far away from the second opening, of the second cover body.

Preferably, the explosion-proof structure is an explosion-proof seal formed by stretching and forming on the outer end face of the first cover body far away from one end of the first opening and/or the outer end face of the second cover body far away from one end of the opening.

Preferably, the width of the explosion-proof seal is 0.1-0.2 mm.

Preferably, the depth of the explosion-proof print is 0.03-0.07 mm.

Preferably, the explosion-proof seal comprises a negative pole mark arranged on the outer end face of one end of the first cover body far away from the first opening, and/or a positive pole mark arranged on the outer end face of one end of the second cover body far away from the opening.

Preferably, the first cover body comprises a first body and a first boss arranged at one end of the first body far away from the first opening;

the negative pole sign sets up the outer terminal surface of first boss.

Preferably, the second cover body comprises a second body and a second boss arranged at one end of the second body far away from the second opening;

the positive pole mark is arranged on the outer end face of the second boss.

Preferably, the housing is a metal shell.

The utility model discloses still construct a button cell, include a be used for button cell's shell and accept in battery pack in the shell.

Preferably, the electric core assembly comprises a winding core, an insulating rod arranged in the winding core in a penetrating mode, and a positive tab and a negative tab arranged at two ends of the winding core.

Implement the utility model discloses a button cell and be used for button cell's shell has following beneficial effect: the shell for the button cell forms an explosion-proof structure through a stretching forming mode on the outer end face of one end of the first cover body far away from the first opening and/or on the outer end face of one end of the second cover body far away from the second opening in the second mode, so that explosion prevention can be realized in the using process and under abnormal conditions, the safety performance of the button cell can be improved, and the personal safety of a user is protected.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic perspective view of a button cell according to some embodiments of the present invention;

FIG. 2 is an exploded view of the housing of the button cell of FIG. 1;

FIG. 3 is a schematic perspective view of the upper cover of the housing of FIG. 2;

fig. 4 is a perspective view of a lower cover of the housing shown in fig. 2.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 and 2 show some preferred embodiments of the button cell of the present invention. This button cell can be applied to products such as TWS bluetooth headset, motion bracelet, and it has explosion-proof function, and it can be explosion-proof under using abnormal conditions, and it has the advantage that the security performance is high to can satisfy the user to the demand of security performance.

As shown in fig. 1 and 2, the button cell may include the housing and the cell assembly of the present invention. The outer shell may be a metal shell that can be used to house the electrical core assembly. The electric core component can be accommodated in the outer shell and can generate electric energy through electrochemical reaction.

The electric core component can comprise a winding core, an insulating rod, a positive electrode tab and a negative electrode tab. The winding core can be formed by winding a positive plate, a negative plate and a diaphragm, can be columnar and is provided with a central through hole. The positive tab and the negative tab can be respectively arranged at two ends of the winding core and are respectively correspondingly connected with the positive plate and the negative plate. The insulating rod can be inserted into the winding core and positioned in the central through hole of the winding core, and the insulating rod can be integrally made of insulating materials.

As shown in fig. 2-4, the housing may be a steel shell, and it is understood that in other embodiments, the housing may not be limited to a steel shell, but may be other metal shells. In some embodiments, the housing may include an upper cover 10 and a lower cover 20. The upper cover 10 can be sleeved on the periphery of the electric core assembly. The lower cover 20 can be sleeved on the periphery of the upper cover 10, and can be assembled with the upper cover 10 to form a closed accommodating cavity for accommodating the electric core assembly.

Further, in some embodiments, the upper cover 10 may include a first cover 11 and a first opening 12. The first cover 11 is a hollow structure, and an accommodating cavity is formed inside the first cover. The first opening 12 may be disposed at one end of the first cover 11, and may be communicated with the accommodating cavity, which may be used for the electrical core assembly to be installed therein.

In some embodiments, the first cover 11 may include a first body 111 and a first boss 112. The first body 111 may be cylindrical, and the inner diameter thereof may be adapted to the outer diameter of the winding core, specifically, the inner diameter of the first body 111 may be slightly larger than the outer diameter of the winding core. The first boss 112 may be disposed at an end of the first body 111 away from the first opening 12, and may be integrally formed with the first body 111. Specifically, in some embodiments, the first boss 112 and the first body 111 may be formed by stretching. In some embodiments, the first boss 112 may be circular in cross-section and have a radial dimension that is less than a radial dimension of the first body 111. In some embodiments, the end of the first cover 11 away from the opening can be disposed corresponding to the negative electrode of the button cell, and specifically, the first protrusion 112 can be disposed corresponding to the negative electrode of the cell assembly, which can form a negative electrode end.

Further, in some embodiments, the lower cover 20 may include a second cover 21 and a second opening 22. The second cover 21 is a hollow structure, and an accommodating cavity is formed inside the second cover. The second cover 21 may have a size slightly larger than that of the first cover 11, and may be sleeved on the periphery of the first cover 11 from the first opening 12 of the first cover 11 along the direction of the first boss 112 on the first cover 11. The second opening 22 may be disposed at one end of the second cover 21, and may be communicated with the accommodating cavity, which may be used for accommodating the first cover 11.

In some embodiments, the second cover 21 may include a second body 211 and a second boss 212. The second body 211 may be cylindrical, and the inner diameter thereof may be adapted to the outer diameter of the first body 111, and specifically, the inner diameter of the second body 211 may be slightly larger than the outer diameter of the first body 111. The second boss 212 may be disposed at an end of the second body 211 away from the second opening 22, and may be integrally formed with the second body 211. Specifically, in some embodiments, the second boss 212 may be formed by drawing with the second body 211. In some embodiments, the second boss 212 may be circular in cross-section with a radial dimension that is less than a radial dimension of the second body 221. In some embodiments, an end of the second cover 21 away from the second opening 22 may be disposed corresponding to the positive electrode of the button cell, and in particular, the second protrusion 212 may be disposed corresponding to the positive electrode of the cell assembly, which may form a positive terminal.

Further, in some embodiments, the housing may also include an explosion-proof structure. The explosion-proof structure can enable the shell to be formed in an explosion-proof mode, so that the shell can be explosion-proof in the using process and under an abnormal condition, the safety performance of the button cell can be improved, and the personal safety of a user is protected. In some embodiments, the explosion-proof structure can be formed by stretching on the outer end face of the first cover 11 away from the first opening 12 and the outer end face of the second cover 21 away from the second opening 22, specifically, they can be formed on the outer end face of the first boss 112 and the outer end face of the second boss 212, respectively. By providing the explosion-proof structure on the outer end faces of the first boss 112 and the second boss 212, a double explosion-proof safety can be provided to ensure the safety performance of the button cell, and it can be understood that it can also be provided only on the outer end face of the end of the first cover 11 away from the first opening 12 or the outer end face of the end of the second cover 21 away from the second opening 22. Stretch forming is a press working method for forming a flat blank into a hollow structure using a die, and is a commonly used forming process.

Further, in some embodiments, the explosion-proof structure may be an explosion-proof seal formed by stretching and forming on the outer end face of the first cover 11 away from the first opening 12 and the outer end face of the second cover 21 away from the opening, so as to reduce the thickness of the first cover 11 and the second cover 12. The shape of the implosion proof seal on the first cover 11 and the second cover 21 may be different. In some embodiments, the width of the anti-explosion stamp may be 0.1-0.2 mm, and in some embodiments, the width of the anti-explosion stamp may be 0.15 mm. In some embodiments, the depth of the explosion-proof print can be 0.03-0.07 mm, and in some embodiments, the depth of the explosion-proof print can be 0.05 mm.

Further, in some embodiments, the explosion-proof print can be made into the negative electrode mark 31 and the positive electrode mark 32 by combining the positive and negative polarity characteristics of the button cell. The negative electrode mark 31 is located on the outer end face of the first cover 11 far away from the first opening 12, specifically on the outer end face of the first boss 112, and is disposed corresponding to the negative electrode of the electrode assembly, which may be a negative electrode of the electrode assembly

And (4) shape. The positive electrode mark 32 can be disposed on the outer end surface of the second cover 21 away from the opening, specifically on the outer end surface of the second boss 212, and is disposed corresponding to the positive electrode of the cell assembly, which can be a positive electrode

And (4) shape. The negative pole mark 31 and the positive pole mark 32 are arranged to effectively avoid the reverse connection of the positive pole and the negative pole of a user, so that the occurrence of reverse charging is avoided, and the assembly efficiency and accuracy can be improved.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A casing for a button cell, characterized in that it comprises an upper cover (10) and a lower cover (20) assembled with the upper cover (10);

the upper cover (10) comprises a first cover body (11) and a first opening (12) arranged at one end of the first cover body (11); one end, far away from the opening, of the first cover body (11) is arranged corresponding to the negative electrode of the button cell;

the lower cover (20) comprises a second cover body (21) sleeved on the periphery of the first cover body (11) and a second opening (22) arranged at one end of the first cover body (11); one end of the second cover body (21), which is far away from the second opening (22), is arranged corresponding to the anode of the button cell;

the shell further comprises an explosion-proof structure which is formed by stretching and forming on the outer end face of one end of the first cover body (11) far away from the first opening (12) and/or the outer end face of one end of the second cover body (21) far away from the second opening (22).

2. The housing for button cells according to claim 1, wherein said explosion-proof structure is an explosion-proof seal stretch-molded on the outer end face of the first cover (11) at the end away from the first opening (12) and/or the outer end face of the second cover (21) at the end away from the opening.

3. The shell for the button cell as claimed in claim 2, wherein the width of the explosion-proof print is 0.1-0.2 mm.

4. The shell for the button cell as set forth in claim 2, wherein the depth of the explosion-proof print is 0.03-0.07 mm.

5. Housing for button cells according to claim 2, characterized in that the bursting-proof seal comprises a negative pole identification (31) arranged on the outer end face of the first cover (11) at the end far away from the first opening (12) and/or a positive pole identification (32) arranged on the outer end face of the second cover (21) at the end far away from the opening.

6. Shell for button cells according to claim 5, characterized in that said first cover (11) comprises a first body (111) and a first boss (112) arranged at one end of said first body (111) far from said first opening (12);

the cathode mark (31) is arranged on the outer end face of the first boss (112).

7. Shell for button cells according to claim 5, characterized in that said second cover (21) comprises a second body (211), and a second boss (212) arranged at one end of said second body (211) far from said second opening (22);

the positive pole mark (32) is arranged on the outer end face of the second boss (212).

8. Housing for button cells according to claim 1, characterized in that it is a metal shell.

9. A button cell, comprising the housing for a button cell according to any one of claims 1 to 8, and a cell assembly housed in the housing.

10. The button cell according to claim 9, wherein the core assembly comprises a winding core, an insulating rod penetrating the winding core, and a positive tab and a negative tab disposed at two ends of the winding core.