CN212257582U

CN212257582U - Bean type battery structure

Info

Publication number: CN212257582U
Application number: CN202021870078.6U
Authority: CN
Inventors: 吴平东; 周进佑; 李新龙
Original assignee: Shenzhen Lidea Battery Co ltd
Current assignee: Shenzhen Lidea Battery Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-12-29
Anticipated expiration: 2030-08-31

Abstract

The invention provides a bean-type battery structure which comprises a negative electrode shell, a positive electrode shell, a winding core and a buffer ring, wherein the negative electrode shell is provided with a negative electrode side wall, the positive electrode shell is provided with a positive electrode side wall, the negative electrode shell is buckled with an opening of the positive electrode shell, the negative electrode side wall is sleeved with the positive electrode side wall to form an accommodating cavity, the winding core is arranged in the accommodating cavity and provided with a positive electrode lug and a negative electrode lug, the buffer ring is insulated and arranged between the negative electrode side wall and the positive electrode side wall, the positive electrode lug is clamped between the buffer ring and the positive electrode side wall, and the negative electrode lug is clamped between the buffer ring and the negative electrode side wall. The bean type battery structure does not need to weld the pole lug and the pole shell, the surface of the pole shell is smooth, and liquid leakage and swelling phenomena cannot occur.

Description

Bean type battery structure

Technical Field

The invention relates to the technical field of battery structures, in particular to a bean type battery structure.

Background

The bean cell is also called a button cell (button cell), and is a cell with an external dimension like a small button, and generally has a larger diameter and a thinner thickness. The bean type battery can be divided into a cylindrical battery, a square battery and a special-shaped battery in appearance.

Button cells include both laminate and wound. The basic structure of the winding type button cell is as follows: the button battery comprises a negative electrode shell, a positive electrode shell, an insulating sealing ring and a battery cell, wherein the negative electrode shell and the positive electrode shell are oppositely buckled with each other at the upper opening and the lower opening to form a cylindrical button battery shell; a gap is reserved between the negative electrode shell and the positive electrode shell, the insulating sealing ring is filled in the gap to electrically isolate the negative electrode shell from the positive electrode shell, and an accommodating cavity is formed among the negative electrode shell, the positive electrode shell and the insulating sealing ring; the electric core is located the holding intracavity, electric core include negative pole piece, positive plate and diaphragm, through the diaphragm interval between negative pole piece and the positive plate, electric core is made in negative pole piece, positive plate and the coiling of diaphragm, is equipped with negative pole utmost point ear on the negative pole piece, and negative pole utmost point ear stretches out and welds with the negative pole shell from electric core, is equipped with anodal utmost point ear on the positive plate, and anodal utmost point ear stretches out and welds with the positive pole shell from electric core. However, if the welding spot is shallow, the tab is easy to fall off, which results in the rejection of the battery, and if the welding spot is deep, the surface flatness and stability of the electrode shell are damaged, and during the use of the battery, electrolyte leakage and surface bulge are easy to occur at the welding spot position of the electrode shell.

In view of the above, a new bean-type battery structure is needed to solve the above technical problems.

Disclosure of Invention

The invention aims to provide a bean-type battery structure, which does not need to weld a tab, has a smooth surface of a positive electrode shell or a negative electrode shell, and does not have the phenomena of liquid leakage and swelling.

The invention provides a bean-type battery structure which comprises a negative electrode shell, a positive electrode shell, a winding core and a buffer ring, wherein the negative electrode shell is provided with a negative electrode side wall, the positive electrode shell is provided with a positive electrode side wall, the negative electrode shell is buckled with an opening of the positive electrode shell, the negative electrode side wall is sleeved with the positive electrode side wall to form an accommodating cavity, the winding core is arranged in the accommodating cavity and provided with a positive electrode lug and a negative electrode lug, the buffer ring is insulated and arranged between the negative electrode side wall and the positive electrode side wall, the positive electrode lug is clamped between the buffer ring and the positive electrode side wall, and the negative electrode lug is clamped between the buffer ring and the negative electrode side wall.

Furthermore, the cathode side wall is sleeved on the inner side of the anode side wall, one end, far away from the cathode shell, of the buffer ring extends inwards to form a hanging wall, and the buffer ring is hung on the cathode side wall by the hanging wall.

Furthermore, the negative pole lug bypasses the negative pole side wall and is in contact with the inner surface of the buffer ring, and the positive pole lug bypasses one end, close to the positive pole shell, of the buffer ring and is in contact with the outer surface of the buffer ring.

Further, the buffer ring covers the part of the positive electrode side wall sleeved with the negative electrode side wall to insulate and isolate the positive electrode shell and the negative electrode shell.

Further, the end of the side wall of the positive electrode can is bent inward to fix the negative electrode can and the buffer ring, and the negative electrode can and the buffer ring are prevented from being separated from the positive electrode can.

Compared with the prior art, the bean-type battery structure provided by the invention is provided with the buffer ring, the buffer ring is insulated and arranged between the cathode side wall and the anode side wall, the anode tab is clamped between the buffer ring and the anode side wall, and the cathode tab is clamped between the buffer ring and the cathode side wall. By the elasticity of buffer ring, anodal utmost point ear and negative pole utmost point ear all need not the welding, but pass through interference fit respectively with anodal shell and negative pole shell zonulae occludens, and the utmost point shell surfacing can not appear leaking liquid and swell the phenomenon.

Drawings

Fig. 1 is an exploded view of the structure of a bean type battery of the present invention.

Fig. 2 is a cross-sectional view of a bean type battery structure of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The terms first, second, third, fourth and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The "ranges" disclosed herein are in the form of lower and upper limits. There may be one or more lower limits, and one or more upper limits, respectively. The given range is defined by the selection of a lower limit and an upper limit. The selected lower and upper limits define the boundaries of the particular range. All ranges that can be defined in this manner are inclusive and combinable, i.e., any lower limit can be combined with any upper limit to form a range. For example, ranges of 60-120 and 80-110 are listed for particular parameters, with the understanding that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present invention, all embodiments and preferred embodiments mentioned herein may be combined with each other to form a new technical solution, if not specifically stated.

As shown in fig. 1-2, the present invention provides a bean-type battery structure 1, wherein the bean-type battery structure 1 includes a negative electrode can 10, a positive electrode can 20, a winding core 30 and a buffer ring 40. The negative electrode shell 10 has a negative electrode side wall 11, the positive electrode shell 20 has a positive electrode side wall 21, the negative electrode shell 10 is buckled with the opening of the positive electrode shell 20, and the negative electrode side wall 11 is sleeved with the positive electrode side wall 21 to form an accommodating cavity 50. Specifically, the cathode side wall 11 is sleeved inside the anode side wall 21, and one end of the buffer ring 40 away from the cathode casing 10 extends inward to form a hanging wall 41, and the buffer ring 40 is hung on the cathode side wall 11 by the hanging wall 41.

The winding core 30 is disposed in the accommodating cavity 50 and has a positive electrode tab 22 and a negative electrode tab 12, the buffer ring 40 is insulated and disposed between the negative electrode side wall 11 and the positive electrode side wall 21, the positive electrode tab 22 is sandwiched between the buffer ring 40 and the positive electrode side wall 21, and the negative electrode tab 12 is sandwiched between the buffer ring 40 and the negative electrode side wall 11. Specifically, the negative electrode tab 12 contacts the inner surface of the buffer ring 40 around the negative electrode side wall 11, and the positive electrode tab 22 contacts the outer surface of the buffer ring 40 around the end of the buffer ring 40 near the positive electrode can 20. The buffer ring 40 covers the portion of the positive electrode side wall 21 that is fitted over the negative electrode side wall 11 to insulate and separate the positive electrode can 20 and the negative electrode can 10.

In summary, a winding core 30 is first placed in a negative electrode casing 10, a negative electrode tab 12 of the winding core 30 is bent to make the negative electrode tab 12 contact with the outer side of a negative electrode side wall 11 of the negative electrode casing 10, a buffer ring 40 is sleeved on the outer side of the negative electrode side wall 11, the negative electrode tab 12 is sandwiched between the buffer ring 40 and the negative electrode side wall 11, a positive electrode tab 22 of the winding core 30 is bent to make the positive electrode tab 22 contact with the outer side of the buffer ring 40, and finally a positive electrode side wall 21 of a positive electrode casing 20 is sleeved on the outer side of the buffer ring 40 to make the positive electrode tab 22 sandwiched between the buffer ring 40 and the positive electrode side wall 21, the buffer ring 40 is sleeved on the positive electrode casing 20 to extrude the buffer ring 40, the buffer ring 40 has certain elasticity, and the positive electrode tab 22 and the negative electrode tab 12 are respectively tightly connected with the positive electrode side wall 21 and the negative. After assembly, the end of the sidewall of the positive electrode can 20 is bent inward to fix the negative electrode can 10 and the buffer ring 40, preventing the negative electrode can 10 and the buffer ring 40 from being separated from the positive electrode can 20.

Compared with the prior art, the bean-type battery structure 1 provided by the invention has the buffer ring 40, the buffer ring 40 is insulated and arranged between the negative electrode side wall 11 and the positive electrode side wall 21, the positive electrode tab 22 is clamped between the buffer ring 40 and the positive electrode side wall 21, and the negative electrode tab 12 is clamped between the buffer ring 40 and the negative electrode side wall 11. By means of the elasticity of the buffer ring 40, the positive electrode tab 22 and the negative electrode tab 12 are not required to be welded, but are respectively tightly connected with the positive electrode shell 20 and the negative electrode shell 10 through interference fit, the surfaces of the electrode shells are smooth, and liquid leakage and bulging phenomena cannot occur.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A prismatic battery structure, comprising:

a negative casing having a negative sidewall;

the positive electrode shell is provided with a positive electrode side wall, the negative electrode shell is buckled with the opening of the positive electrode shell, and the negative electrode side wall is sleeved with the positive electrode side wall to form an accommodating cavity;

the winding core is arranged in the accommodating cavity and is provided with a positive electrode lug and a negative electrode lug; and

the buffer ring is insulated and arranged between the negative side wall and the positive side wall, the positive pole lug is clamped between the buffer ring and the positive side wall, and the negative pole lug is clamped between the buffer ring and the negative side wall.

2. The bean-type battery structure of claim 1, wherein the cathode side wall is sleeved inside the anode side wall, and one end of the buffer ring away from the cathode casing extends inwards to form a hanging wall, and the buffer ring is hung on the cathode side wall by the hanging wall.

3. The prismatic battery structure of claim 2, wherein said negative tab is in contact with an inner surface of said buffer ring around said negative sidewall, and said positive tab is in contact with an outer surface of said buffer ring around an end of said buffer ring adjacent said positive can.

4. The prismatic battery structure of claim 1, wherein said buffer ring covers a portion of said positive electrode side wall in nesting engagement with said negative electrode side wall to insulate and isolate said positive electrode can from said negative electrode can.

5. The prismatic battery structure according to claim 1, wherein the end of the side wall of said positive electrode can is bent inward to fix said negative electrode can and said buffer ring, preventing said negative electrode can and said buffer ring from being separated from said positive electrode can.