Button cell

Abstract

The utility model provides a button cell which comprises a current collecting cover, the current collecting cover comprises an annular current collecting cover body, an opening part at the lower end of the current collecting cover body horizontally extends outwards in the radial direction to form a horizontal outer brim, and a sealing ring contact part is arranged on the upper surface of the horizontal outer brim. The outer brim of the current collecting cover is only the horizontal outer brim, the whole structure is simpler, the manufacturing is more convenient, meanwhile, the bottom of the sealing ring abuts against the upper surface of the horizontal outer brim to press the current collecting cover when the battery is subjected to edge pressing and sealing, the sealing ring only generates axially downward pressing force on the current collecting cover, and the sealing effect is better. Even if the blank-pressing sealing force of the battery is too large or the size of the current collecting cover is slightly too large, the current collecting cover cannot be deformed and bulged, so that the requirements on the size of the current collecting cover and the blank-pressing sealing force of the battery are reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a button battery. Background Art

[0002] The conventional button battery structure includes a positive electrode shell, a negative electrode cover, a positive electrode sheet, a negative electrode sheet and a diaphragm. The positive electrode shell and the negative electrode cover are both cylindrical with only one end open. The positive electrode shell and the negative electrode cover are buckled relative to each other to form the shell of the button battery. A sealing ring is embedded between the positive electrode shell and the negative electrode cover. The positive electrode sheet is attached to the inner side of the bottom surface of the positive electrode shell. The diaphragm is laid on the positive electrode sheet with the opening of the diaphragm facing the positive electrode shell. The negative electrode sheet is stacked on the diaphragm and contacts the bottom surface of the negative electrode cover. In order to prevent the positive electrode sheet from expanding outward, the positive electrode sheet is usually placed in a cylindrical positive electrode cover with a hollow bottom.

[0003] Since the conventional positive electrode cover is simply clamped in the shell, it is easy for the positive electrode cover to shift in special battery usage environments (for example, when the button battery is used as a tire pressure battery, the battery will rotate at high speed with the tire), resulting in poor contact of the positive electrode sheet and abnormal usage.

[0004] The collectors with authorization announcement numbers CN 215184234U and CN 215266466U limit the collectors by abutting the seal ring against the collectors; and when the battery is pressed and sealed, the seal ring will not only produce an axial downward pressing force on the collector, but also a radial inward pressing force. When the edge sealing force is too strong or the diameter of the collector is too large, it is easy to cause the collector to deform, which in turn leads to poor contact of the positive electrode and abnormal battery use. Therefore, the existing collector structure has high requirements on the size of the collector and the battery edge sealing force, and the existing collector structure is complex and troublesome to manufacture. Utility Model Content

[0005] The utility model aims to provide an improved current collecting cover, which can not only limit the positive electrode sheet to avoid expansion, but also has a simpler structure, is more convenient to manufacture, and has low requirements on the size of the current collecting cover and the sealing force of the battery edge pressing.

[0006] The technical solution for achieving the first object of the utility model is: an improved collector, including an annular collector body, the lower end opening of the collector body radially extends horizontally outward to form a horizontal outer edge, and the upper surface of the horizontal outer edge has a sealing ring contact portion.

[0007] The outer edge of the current collecting hood of the utility model is only a horizontal outer edge, and the overall structure is simpler and more convenient to manufacture. At the same time, when the battery is pressed and sealed, the bottom of the sealing ring abuts against the upper surface of the horizontal outer edge to press the current collecting hood, and the sealing ring only generates an axial downward pressing force on the current collecting hood. Even if the battery pressing and sealing force is too large or the size of the current collecting hood is slightly too large, it will not cause deformation and bulging of the current collecting hood. Therefore, the size of the current collecting hood and the requirements for the battery pressing and sealing force are reduced.

[0008] Furthermore, the horizontal outer eaves are ring-shaped.

[0009] A second purpose of the present utility model is to provide a button battery.

[0010] The technical solution for achieving the second purpose of the utility model is: a button battery, which includes a positive electrode shell, a negative electrode cover, a sealing ring and a positive electrode sheet, the negative electrode cover is a cylindrical structure with an opening at the bottom end, the sealing ring is arranged around the outer peripheral wall of the negative electrode cover, the sealing ring covers the outer peripheral wall of the negative electrode cover and extends along the outer peripheral wall to the lower end until it covers the surface of the bottom edge of the negative electrode cover; the positive electrode shell is a cylindrical structure with an opening at the top end, the improved current collecting cover described in the first purpose of the present invention is embedded in the positive electrode shell, and the lower surface of the current collecting cover is fitted with the inner bottom surface of the positive electrode shell; the negative electrode shell is embedded on the inner side of the top opening of the positive electrode shell, the outer peripheral wall of the sealing ring is fitted with the inner peripheral wall of the positive electrode shell, the bottom of the sealing ring is pressed against the upper surface of the horizontal outer edge of the current collecting cover and fits with the contact part of the sealing ring, and the positive electrode sheet is embedded in the current collecting cover body.

[0011] Furthermore, the outer end of the horizontal outer edge extends to the inner peripheral wall of the positive electrode shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic diagram of an axial cross-sectional structure of a current collecting cover of the present invention, wherein the dot-dash line is the central axis of the current collecting cover;

[0013] FIG2 is a schematic diagram of the top view of the collecting cover of the present invention;

[0014] FIG3 is a schematic diagram of an axial cross-sectional structure of a button-type battery of the present invention, wherein the dot-dash line is the central axis of the battery. Implementation

[0015] The specific implementation of the button battery of the utility model is now described in detail with reference to the accompanying drawings:

[0016] 1 and 2 , an improved collector 10 includes an annular collector body 11 , the lower end opening of the collector body 11 radially extends outward horizontally to form a horizontal outer edge 12 , and the upper surface of the horizontal outer edge 12 has a sealing ring contact portion 121 .

[0017] The current collecting cover 10 of the utility model can limit the positive electrode sheet 20 in the current collecting cover body 11. At the same time, the outer edge of the current collecting cover is only a horizontal outer edge 12, the overall structure is simpler and the manufacturing is more convenient. At the same time, when the battery is pressed and sealed, the bottom of the sealing ring 30 abuts against the upper surface of the horizontal outer edge 12 to press the current collecting cover 10. The sealing ring 30 only generates an axial downward pressing force on the current collecting cover 10. Even if the battery pressing and sealing force is too large or the size of the current collecting cover 10 is slightly too large, it will not cause the deformation and bulging of the current collecting cover 10. Therefore, the size of the current collecting cover 10 and the requirements for the battery pressing and sealing force are reduced.

[0018] Furthermore, as shown in Fig. 2, the horizontal outer edge 12 is annular and easy to manufacture. Of course, the shape of the horizontal outer edge 12 is not limited to the annular shape shown in the figure, and it can also be a plurality of sheet structures distributed circumferentially.

[0019] As shown in FIG3 , a button cell using the improved current collecting cover 10 of the utility model comprises a positive electrode shell 40, a negative electrode cover 50, a sealing ring 30 and a positive electrode sheet 20, wherein the negative electrode cover 50 is a cylindrical structure with an opening at the bottom end, and the sealing ring 30 is arranged around the outer peripheral wall of the negative electrode cover 50, and the sealing ring 30 covers the outer peripheral wall of the negative electrode cover 50 and extends along the outer peripheral wall to the lower end until it covers the surface of the bottom edge of the negative electrode cover 50; the positive electrode shell 40 is a cylindrical structure with an opening at the top end, and the improved current collecting cover 10 of the first purpose of the present invention is embedded in the positive electrode shell 40, and the lower surface of the current collecting cover 10 is in contact with the inner bottom surface of the positive electrode shell 40; the negative electrode cover 50 is embedded inside the top opening of the positive electrode shell 40, and the outer peripheral wall of the sealing ring 30 is in contact with the inner peripheral wall of the positive electrode shell 40, and the sealing ring 30 is in contact with the inner peripheral wall of the positive electrode shell 40. The bottom of the positive electrode 20 is pressed against the upper surface of the horizontal outer edge 12 of the current collecting cover 10 and fits with the sealing ring contact portion 121 , and the positive electrode sheet 20 is embedded in the current collecting cover body 11 .

[0020] Of course, the shape of the negative electrode cover 50 of the present invention can be but is not limited to the specific structure in the drawings.

[0021] Further, as shown in FIG3 , the outer end of the horizontal outer edge 12 extends radially outward to the inner circumferential wall of the positive electrode shell 40. Of course, the outer end of the horizontal outer edge 12 may also be a distance away from the inner circumferential wall of the positive electrode shell 40, as long as the outer end of the horizontal outer edge 12 can extend below the bottom of the sealing ring 30 so that the bottom of the sealing ring 30 can be pressed against the upper surface of the horizontal outer edge 12.

[0022] For ordinary technicians in the technical field to which the utility model belongs, the utility model can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as falling within the protection scope of the utility model.

Claims

1. A button battery, comprising a positive electrode shell, a negative electrode cover, a sealing ring and a positive electrode sheet, wherein the negative electrode cover is a cylindrical structure with an opening at the bottom end, the sealing ring is arranged around the outer peripheral wall of the negative electrode cover, the sealing ring covers the outer peripheral wall of the negative electrode cover and extends along the outer peripheral wall to the lower end until it covers the surface of the bottom edge of the negative electrode cover; the positive electrode shell is a cylindrical structure with an opening at the top end, characterized in that: A current collecting cover is embedded in the positive electrode shell, and the current collecting cover includes an annular current collecting cover body, the lower end opening of the current collecting cover body extends radially outward horizontally to form a horizontal outer edge, and the upper surface of the horizontal outer edge has a battery sealing ring contact portion; the lower surface of the current collecting cover is fitted with the inner bottom surface of the positive electrode shell; the negative electrode cover is embedded on the inner side of the top end opening of the positive electrode shell, the outer peripheral wall of the sealing ring is fitted with the inner peripheral wall of the positive electrode shell, the bottom of the sealing ring is pressed against the upper surface of the horizontal outer edge of the current collecting cover and fits with the battery sealing ring contact portion, and the positive electrode sheet is embedded in the current collecting cover body.

2. The button battery according to claim 1, characterized in that: The horizontal outer eaves are ring-shaped.

3. The button battery according to claim 1, characterized in that: The outer end of the horizontal outer edge extends to the inner peripheral wall of the positive electrode shell.

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