CN218160603U

CN218160603U - Button cell

Info

Publication number: CN218160603U
Application number: CN202221513855.0U
Authority: CN
Inventors: 王晓飞; 张诗宜; 黄月娥; 陈黎明
Original assignee: Fujian Nanping Nanfu Battery Co Ltd
Current assignee: Fujian Nanping Nanfu Battery Co Ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-12-27
Anticipated expiration: 2032-06-17

Abstract

The utility model provides a button cell, including positive pole shell, set firmly at least one can insert the inside arch of positive plate when the battery equipment on the inner wall of positive pole shell. The button cell of the utility model can not only prevent the positive plate from separating from the positive shell by inserting the bulge fixedly arranged on the inner wall of the positive shell into the positive plate, ensure the electronic transmission between the positive plate and the positive shell and reduce the ohmic impedance; meanwhile, the positive plate can be prevented from shifting or the positive plate can be prevented from being damaged when the button cell is subjected to an extreme test condition, such as vibration or centrifugal force of high-speed rotation.

Description

Button cell

Technical Field

The utility model relates to a battery field especially relates to a button cell.

Background

The conventional button cell structure comprises a positive electrode shell, a negative electrode cover, a positive electrode sheet, a negative electrode sheet and a diaphragm, wherein the positive electrode shell and the negative electrode cover are both in a cylindrical shape with only one open end, the positive electrode shell and the negative electrode cover are oppositely buckled to form a shell of the button cell, and a sealing ring is embedded between the positive electrode shell and the negative electrode cover; the positive plate is attached to the inner side of the bottom surface of the positive shell, the diaphragm is laid on the positive plate, and the negative plate is stacked on the diaphragm and is in contact with the bottom surface of the negative cover.

Button batteries (such as button lithium manganese batteries) generate gas in a high-temperature environment, so that the batteries swell, the contact between a positive plate and a positive shell becomes poor, the internal resistance is increased, and the discharge performance is reduced. In addition, the button lithium manganese battery can be displaced or damaged when the button lithium manganese battery is subjected to extreme test conditions, such as vibration or centrifugal force of high-speed rotation, so that the battery performance is unstable.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a button cell which can ensure the good contact between the positive plate and the positive shell and reduce the ohmic impedance; in addition, the positive electrode plate is prevented from shifting or being damaged.

The button cell comprises a positive electrode shell, wherein at least one bulge capable of being inserted into a positive electrode sheet when the cell is assembled is fixedly arranged on the inner wall of the positive electrode shell.

The button cell of the utility model can bulge under high temperature environment, and the bulge fixedly arranged on the inner bottom surface of the positive plate is inserted into the positive plate, so that the positive plate can be prevented from being separated from the positive plate, the electronic transmission between the positive plate and the positive plate is ensured, and the ohmic impedance is reduced; meanwhile, the positive plate can be prevented from being displaced or damaged when the button cell is subjected to extreme test conditions such as vibration or centrifugal force of high-speed rotation.

Preferably, the protrusion is located on an inner bottom surface of the positive electrode can.

Generally, the positive electrode can has a cylindrical structure with only an open top end.

The button cell further comprises a positive pole cover which is of a cylindrical structure with only an open top end, the positive pole piece is coaxially embedded in the positive pole cover when the cell is assembled, the positive pole cover and the positive pole piece are coaxially placed in the positive pole shell together, the outer bottom surface of the positive pole cover is attached to the inner bottom surface of the positive pole shell, a through hole is formed in the bottom wall of the positive pole cover, a protrusion is arranged on the inner bottom surface of the positive pole shell corresponding to the through hole, and the protrusion penetrates through the through hole and is inserted into the inside of the positive pole piece. The positive pole cover can prevent the positive pole piece from expanding outwards. Further, the inner peripheral surface of the positive electrode cover is bonded to the outer peripheral surface of the positive electrode sheet. Preferably, the bottom wall of the positive electrode cover is an annular edge ring, and a central cavity of the edge ring is used as the through hole for the protrusion to pass through.

Preferably, the protrusion is welded and fixed on the inner bottom surface of the positive electrode shell.

Preferably, the protrusion is in a triangular cone shape, so that the top end of the protrusion can be conveniently inserted into the positive plate.

Preferably, the height of the protrusion is 0.15 to 0.5 times of the thickness of the positive plate.

Drawings

Fig. 1 is a schematic longitudinal sectional structure diagram of a button cell of the present invention;

fig. 2 is a schematic top view of the positive electrode cover of the present invention.

Detailed Description

The best embodiment of the button cell battery of the present invention is described in detail below with reference to the accompanying drawings:

taking a button lithium manganese battery as an example, as shown in fig. 1, the button lithium manganese battery is characterized in that the positive electrode shell 10 is a cylindrical structure with only an open top end, and comprises a positive electrode shell 10, and three protrusions 30 capable of being inserted into the positive electrode sheet 20 during battery assembly are fixedly arranged on the inner bottom surface of the positive electrode shell 10.

The button lithium manganese battery of the utility model can bulge under high temperature environment, and the protrusion 30 fixed on the inner bottom surface of the positive plate 10 is inserted into the positive plate 20, so that the positive plate 20 can be prevented from being separated from the positive plate 10, the electronic transmission between the two is ensured, and the ohmic impedance is reduced; meanwhile, the positive plate 20 can be prevented from being displaced or damaged when the button cell is subjected to extreme test conditions, such as vibration or centrifugal force of high-speed rotation.

Of course, the number of the protrusions 30 of the present invention is not limited to three, and may be one, two, or more than four. In addition, the position of each protrusion 30 of the present invention is not limited, and can be adjusted as needed. In addition, the utility model discloses a protruding 30 is not limited to being located the interior bottom surface of positive plate shell 10, also can be located the inner peripheral surface of positive plate shell, also can play and prevent that positive plate 20 from taking place to shift or suffering the effect of destruction under positive plate 20 and the positive plate shell 10 separation and the extreme test condition.

As shown in fig. 1, the button cell further includes a positive electrode cover 40, the positive electrode cover 40 is a cylindrical structure with only an open top end, the positive electrode sheet 20 is coaxially embedded in the positive electrode cover 40 when the cell is assembled, the positive electrode cover 40 and the positive electrode sheet 20 are coaxially placed in the positive electrode casing 10 together, an outer bottom surface of the positive electrode cover 40 is attached to an inner bottom surface of the positive electrode casing 10, a through hole 41 is formed in a bottom wall 400 of the positive electrode cover 40, the protrusion 30 is disposed on the inner bottom surface of the positive electrode casing corresponding to the through hole 41, and the protrusion 30 passes through the through hole 41 and is inserted into the positive electrode sheet 20. The positive electrode cover 40 is provided to prevent the positive electrode tab 20 from swelling outward. Of course, the button cell may not be provided with the positive electrode cover 40, but the positive electrode sheet 20 is directly and coaxially placed in the positive electrode can 10, and the bottom surface of the positive electrode sheet 20 is attached to the inner bottom surface of the positive electrode can 10. Further, as shown in fig. 1, the inner peripheral surface of the positive electrode cover 40 is bonded to the outer peripheral surface of the positive electrode sheet 20. Preferably, as shown in fig. 2, the bottom wall 400 of the positive electrode cover 40 is an annular rim, and the central cavity of the rim serves as the through hole 41 for the protrusion 30 to pass through. Of course, the bottom wall 400 of the positive electrode cover 40 is not limited to the specific structure shown in the drawings, and may be a bottom wall structure with a through hole. In the specific implementation process, the positive electrode cover 40 is generally made of metal, and can play a role in preventing the positive electrode sheet 20 from expanding, and also has good conductivity to play a role in collecting current, but the positive electrode cover 40 is not limited to be made of metal.

Preferably, the protrusion 30 is welded and fixed on the inner bottom surface of the positive electrode can 10. Of course, the protrusion 30 may be fixed to the inner bottom surface of the positive electrode can 10 by other fixing methods such as integral molding and adhesion.

Preferably, as shown in fig. 1, the protrusions 30 have a triangular cone shape to facilitate the insertion of the positive electrode sheet 20. Of course, the projection 30 may be of any conventional shape.

Preferably, as shown in fig. 1, the protrusions 30 are uniformly arranged.

Preferably, as shown in fig. 1, the height H of the protrusions 30 is 0.15 to 0.5 times the thickness D of the positive electrode sheet 20.

The button cell of the utility model is not only suitable for the lithium manganese button cell, but also suitable for the button cell of other systems.

The utility model discloses right the utility model discloses the ordinary skilled person in technical field does not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A button cell, comprising a positive shell, characterized in that: and at least one bulge which can be inserted into the positive plate when the battery is assembled is fixedly arranged on the inner wall of the positive shell.

2. The button cell battery according to claim 1, wherein: the protrusion is located on the inner bottom surface of the positive electrode shell.

3. The button cell according to claim 1, characterized in that: the positive electrode shell is of a cylindrical structure with only an open top end.

4. The button cell according to claim 2, characterized in that: the button cell further comprises a positive pole cover which is of a cylindrical structure with only an open top end, the positive pole piece is coaxially embedded in the positive pole cover when the cell is assembled, the positive pole cover and the positive pole piece are coaxially placed in the positive pole shell together, the outer bottom surface of the positive pole cover is attached to the inner bottom surface of the positive pole shell, a through hole is formed in the bottom wall of the positive pole cover, a protrusion is arranged on the inner bottom surface of the positive pole shell corresponding to the through hole, and the protrusion penetrates through the through hole and is inserted into the inside of the positive pole piece.

5. The button cell battery according to claim 4, wherein: the inner circumferential surface of the positive electrode cover is attached to the outer circumferential surface of the positive electrode plate.

6. The button cell according to claim 4, wherein: the bottom wall of the positive pole cover is an annular edge ring, and a central cavity of the edge ring is used as the through hole for the protrusion to pass through.

7. The button cell battery according to claim 2, wherein: the bulges are welded and fixed on the inner bottom surface of the positive electrode shell.

8. The button cell according to claim 1, characterized in that: the bulges are in a triangular cone shape.

9. The button cell according to claim 1, characterized in that: the height of the convex bulge is 0.15-0.5 times of the thickness of the positive plate.