Button cell

Abstract

The utility model provides a button cell. The button cell comprises a positive electrode cover and a negative electrode cover, an active material accommodating area is arranged in the positive electrode ring; the gasket is connected to the positive electrode cover, the gasket is located in the active material containing area, the gasket is provided with a protruding structure which is closed in the circumferential direction, and the protruding structure is used for fixing an active material. According to the button cell, the stability of the internal structure of the button cell can be improved.

Description

Technical Field

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

[0002] A button battery includes a positive electrode cover, a positive electrode ring, a diaphragm, a negative electrode, and a negative electrode cover. To facilitate battery assembly, the positive electrode ring is usually placed directly inside the positive electrode cover, and the positive electrode cover and the positive electrode ring are in close contact through sealing and pressing. Since there is no limiting structure, the positive electrode ring has a certain amount of movement space inside the button battery. When subjected to severe vibration, high-speed centrifugation and other environmental applications, the active material inside the positive electrode ring is prone to displacement, resulting in poor contact of internal parts, and the battery cannot be used in harsh environments. Utility Model Content

[0003] An embodiment of the present utility model provides a button-type battery, which can improve the technical problem of instability of active materials inside the button-type battery.

[0004] In a first aspect, an embodiment of the present invention provides a button battery, the button battery comprising:

[0005] positive electrode cap;

[0006] A positive electrode ring, wherein an active material receiving area is provided in the positive electrode ring;

[0007] A gasket is connected to the positive electrode cover and is located in the active material receiving area, wherein the gasket is provided with a circumferentially closed protrusion structure, and the protrusion structure is used to fix the active material.

[0008] In one embodiment, the gasket includes a substrate connected to the positive electrode cover, and the protruding structure is disposed on an edge of the substrate.

[0009] In one embodiment, the height of the protruding structure is h, and h is set to be 0.1 mm to 5 mm.

[0010] In one embodiment, the angle formed by the extension line of the outer cross-section of the protruding structure and the plane where the substrate is located is in the range of 90° to 150°.

[0011] In one embodiment, the substrate is configured as a circular structure, the positive electrode ring is provided with a through hole in the active material receiving area, and the substrate is located in the through hole.

[0012] In one embodiment, the ratio of the outer diameter of the substrate to the inner diameter of the positive electrode ring is 2:3 to 5:7.

[0013] In one embodiment, the inner diameter of the positive electrode ring is set to range from 12 mm to 14 mm.

[0014] In one embodiment, the outer diameter of the substrate is set to 8 mm to 10 mm.

[0015] In one embodiment, the gasket and the positive electrode ring are both configured as a centrally symmetrical structure, and the center point of the gasket coincides with the center point of the positive electrode ring.

[0016] In one embodiment, the gasket is provided with a positioning hole, and the positioning hole is used for positioning the gasket and the positive electrode cover when being welded.

[0017] In one embodiment, the center point of the positioning hole coincides with the center of the button battery, and the inner diameter of the positioning hole is 2 mm to 6 mm.

[0018] Beneficial effects of the embodiments of the present utility model:

[0019] In an embodiment of the present invention, a gasket connected to the positive electrode cover is provided, and the gasket is located in the active material receiving area of the positive electrode ring. A circumferentially closed protrusion structure is provided on the gasket, and the protrusion structure is used to fix the active material, so that the active material inside the positive electrode ring is circumferentially limited by the protrusion structure on the gasket. Therefore, when the button battery is used in environments such as severe vibration and high-speed centrifugation, the active material is difficult to move inside the button battery, thereby improving the stability of the button battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 1 is a schematic cross-sectional view of a button battery provided in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the assembled gasket and positive electrode cap provided by an embodiment of the present invention;

[0023] Figure 3 This is a three-dimensional diagram of the gasket and the positive electrode cover provided by an embodiment of the present utility model after assembly;

[0024] Figure 4 This is a top view of the gasket and the positive electrode cover after assembly provided by an embodiment of the present utility model;

[0025] Figure 5 is a cross-sectional view of a gasket provided in an embodiment of the present utility model;

[0026] Figure 6 yes Figure 5 A partial enlarged view of

[0027] Figure 7 is a three-dimensional diagram of a gasket provided in an embodiment of the present utility model;

[0028] Figure 8 is a top view of a gasket provided in an embodiment of the present utility model;

[0029] Figure 9a This is a schematic diagram of a first positioning hole structure of a gasket provided in an embodiment of the present utility model;

[0030] Figure 9b Schematic diagram of a second positioning hole structure of a gasket provided in an embodiment of the present utility model;

[0031] Figure 9c This is a schematic diagram of a third positioning hole structure of a gasket provided in an embodiment of the present utility model;

[0032] Figure 10 This is a schematic diagram of the coil structure of the gasket provided in an embodiment of the present utility model;

[0033] Figure Number:

[0034] 100. Button cell; 11. Positive electrode cover; 12. Negative electrode cover; 13. Negative electrode; 14. Diaphragm; 15. Positive electrode ring; 151. Bottom wall; 152. Side wall; 153. Through hole; 154. Active material receiving area; 16. Positive electrode active material; 17. Sealing ring; 20. Gasket; 21. Raised structure; 22. Substrate; 23. Positioning hole. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0036] In the related art, a button battery includes a positive electrode cover, a positive electrode, a diaphragm, a negative electrode and a negative electrode cover. To facilitate battery assembly, the positive electrode ring is usually placed directly inside the positive electrode cover, and the positive electrode cover and the positive electrode ring are in close contact through sealing and pressing. Since no limiting structure is set, the positive electrode ring has a certain amount of movement space inside the button battery. When subjected to severe vibration, high-speed centrifugation and other environmental applications, the positive electrode material inside the positive electrode ring is prone to displacement, resulting in poor contact of internal parts, and the battery cannot be used in harsh environments.

[0037] Button batteries are commonly used as power sources for signal transmission in electrical devices. With the development of information technology, stable and reliable signal transmission power sources are becoming increasingly important. Power systems often face various challenges, especially in extreme environments, such as unstable current, low voltage, and unstable capacity. To address the stability issues of button batteries in extreme environments, the embodiments of the present invention improve the structure of the button battery to maintain the stability of the positive electrode material within the button battery.

[0038] refer to Figure 1 As shown, an embodiment of the present invention provides a button battery 100. Due to its small size, the button battery 100 can be used as a power source for various small electronic products. In addition, the button battery 100 can also be used as a signal transmission power source in a lithium-ion battery pack.

[0039] The button cell 100 includes a positive electrode cap 11, a positive electrode, a separator 14, a negative electrode 13, a negative electrode cap 12, and a sealing ring 17. The positive electrode cap 11 and the negative electrode cap 12 are configured as a top-to-bottom buckled connection structure. The inner diameter of the positive electrode cap 11 is larger than the outer diameter of the negative electrode cap 12. The negative electrode cap 12 is buckled into the inner cavity of the positive electrode cap 11. A sealing ring 17 is further provided at the connection between the positive electrode cap 11 and the negative electrode cap 12. The sealing ring 17 is configured to wrap around a portion of the wall of the negative electrode cap 12, thereby forming a sealed buckled connection between the positive electrode cap 11 and the negative electrode cap 12.

[0040] The positive electrode cover 11 and the negative electrode cover 12 are fastened together to form a cavity. Inside the cavity, the negative electrode 13, the separator 14, and the positive electrode are stacked in sequence. The separator 14 is used to separate the negative electrode 13 and the positive electrode. The negative electrode 13 includes a lithium sheet, the upper surface of which abuts the inner surface of the negative electrode cover 12, and the lower surface of which abuts the upper surface of the separator 14. The positive electrode includes a positive electrode ring 15 and a positive electrode active material 16 housed in the inner cavity of the positive electrode ring 15. The positive electrode active material 16 typically includes lithium iron phosphate, lithium cobalt oxide, and a ternary composite material. The positive electrode active material 16 is compacted and housed in the inner cavity of the positive electrode ring 15. The separator 14 is configured to at least partially surround the positive electrode ring 15, and the inner diameter of the separator 14 is larger than the outer diameter of the positive electrode ring 15, thereby effectively separating the negative electrode 13 from the positive electrode.

[0041] Further references Figure 1 and Figure 2 As shown, the positive electrode ring 15 includes a bottom wall 151 and a side wall 152 connected to the bottom wall 151. The bottom wall 151 and the side wall 152 enclose an active material receiving area 154. The bottom wall 151 is provided with a through hole 153 and is connected to the positive electrode cover 11. The positive electrode active material 16 is received in the active material receiving area 154 and contacts the positive electrode cover 11 through the through hole 153.

[0042] Further references Figures 1 to 4 As shown, the button cell 100 provided in the embodiment of the present invention further includes a gasket 20, which is connected to the positive electrode cover 11. The gasket 20 is located in the active material receiving area 154 and is provided with a circumferentially closed protrusion structure 21, which is used to fix the positive electrode active material 16.

[0043] A gasket 20 connected to the positive electrode cover 11 is provided. The gasket 20 is located in the active material receiving area 154 of the positive electrode ring 15. A circumferentially closed protrusion structure 21 is provided on the gasket 20. The protrusion structure 21 is embedded in the positive electrode active material 16 inside the positive electrode ring 15, so that the positive electrode active material 16 is circumferentially limited by the protrusion structure 21 on the gasket 20. Therefore, when the button battery 100 is used in environments such as severe vibration and high-speed centrifugation, the positive electrode active material 16 is difficult to move inside the button battery 100, thereby improving the structural stability of the button battery 100.

[0044] Furthermore, the gasket 20 is connected to the positive electrode cover 11. Providing a circumferentially closed protrusion 21 on the gasket 20 increases the contact area between the gasket 20 and the positive electrode active material 16. When the button cell 100 swells, the positive electrode active material 16 and the positive electrode cover 11 can maintain close contact, thereby reducing the internal resistance of the button cell 100 and improving the discharge stability of the button cell 100.

[0045] It should be noted that, compared with providing a plurality of warping structures at intervals on the inner wall of the positive electrode cover 11 , the circumferentially closed protruding structure 21 can provide a more stable circumferential limiting effect on the positive electrode active material 16 .

[0046] Suitable materials for making the gasket 20 include stainless steel, such as at least one of SUS44, SUS304, SUS430, and SUS316. The thickness of the gasket 20 is set to 0.05 mm to 0.35 mm, so that the gasket 20 has suitable rigidity and strength, thereby ensuring a stable connection with the positive electrode cap 11. In a preferred embodiment, the gasket 20 is connected to the positive electrode cap 11 by laser welding.

[0047] Further references Figures 5 to 8As shown, in some embodiments provided by the present invention, the gasket 20 includes a substrate 22 , the substrate 22 is connected to the positive electrode cover 11 , and the protruding structure 21 is arranged on the edge of the substrate 22 .

[0048] By arranging the protruding structure 21 at the edge of the substrate 22 , the protruding structure 21 can be completely embedded in the positive electrode active material 16 after the substrate 22 is welded to the positive electrode cover 11 , and the gasket 20 can provide the maximum circumferential limiting effect on the positive electrode active material 16 .

[0049] In alternative embodiments, a plurality of circumferentially closed protrusions 21 are provided on the substrate 22. The plurality of protrusions 21 are sequentially spaced and embedded in the positive electrode active material 16, thereby enabling the spacer 20 to more stably limit the positive electrode active material 16. Alternatively, in addition to providing the circumferentially closed protrusions 21 on the edge of the substrate 22, a plurality of protrusions may be provided on the substrate 22. The plurality of protrusions and the protrusions 21 may be embedded in the positive electrode active material 16 simultaneously.

[0050] like Figure 5 and Figure 6 As shown, the height of the protrusion structure 21 is h, which is set to 0.1 mm to 5 mm. The height h of the protrusion structure 21 can be 0.5 mm, 1 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, or a value between any two of the above values or a range between any two of the above values.

[0051] The raised structure 21 is configured to be embedded within the positive electrode active material 16. Therefore, the height h of the raised structure 21 is equal to the depth to which the raised structure 21 is embedded within the positive electrode active material 16. The inventors have discovered that when the height h of the raised structure 21 is set between 0.1 mm and 5 mm, the gasket 20 can provide a stable positional restraint for the positive electrode active material 16, enabling the button cell 100 to maintain its internal structural stability under extreme operating conditions. Specifically, when the height h of the raised structure 21 is less than 0.1 mm, the depth of the raised structure 21 embedded within the positive electrode active material 16 is insufficient, and the positive electrode active material 16 may still shift when the button cell 100 is subjected to severe vibration, high-speed centrifugation, or other environmental conditions. When the height h of the raised structure 21 is greater than 5 mm, the height of the positive electrode ring 15 and the overall height of the button cell 100 must be set to greater than 5 mm, which is detrimental to the miniaturization of the button cell 100 and, in turn, affects its usability.

[0052] Further references Figure 6As shown, the inventors have found through research that there is a suitable angle range between the extension line of the outer cross-section of the protruding structure 21 and the plane where the substrate 22 is located. The angle range α between the extension line of the outer cross-section of the protruding structure 21 and the plane where the substrate 22 is located is set to 90° to 150° (including the end points). When the angle α between the extension line of the outer cross-section of the protruding structure 21 and the plane where the substrate 22 is located is within the above range, it is conducive to forming a stable limiting effect between the protruding structure 21 on the gasket 20 and the positive electrode active material 16. When the angle α between the extension line of the outer cross-section of the protruding structure 21 and the plane where the substrate 22 is located is set to 90°, the protruding structure 21 is configured as a straight-edge structure. When the angle α between the extension line of the outer cross-section of the protruding structure 21 and the plane where the substrate 22 is located is greater than 90°, the protruding structure 21 is configured as a beveled-edge structure.

[0053] In a specific implementation, the angle α between the extension line of the outer section of the protruding structure 21 and the plane where the substrate 22 is located can be set to 100°, 110°, 120°, 130°, 140°, or a value between any two of the above values or a range between any two of the above values.

[0054] When the angle between the extended line of the outer cross-section of the protrusion structure 21 and the plane of the substrate 22 is less than 90°, the interaction force between the protrusion structure 21 and the positive electrode active material 16 is not conducive to guiding the positive electrode active material 16 toward the gasket 20, thereby hindering the stability of the positive electrode active material 16. When the angle between the protrusion structure 21 and the substrate 22 is greater than 150°, the height of the protrusion structure 21 remains constant, and the protrusion structure 21 is configured as a beveled structure. As the angle between the extended line of the outer cross-section of the protrusion structure 21 and the plane of the substrate 22 increases, the interaction force between the protrusion structure 21 and the positive electrode active material 16 gradually decreases, and the protrusion structure 21 moves closer to the sidewall 152 of the positive electrode ring 15. This can easily lead to an excessively small gap between the gasket 20 and the positive electrode ring 15, causing the protrusion structure 21 to contact the positive electrode ring 15 and short-circuit when the button cell 100 is subjected to external pressure, which is not conducive to maintaining the stability of the internal structure of the button cell 100.

[0055] Furthermore, the protruding structure 21 may be configured as a pointed structure, thereby facilitating assembly of the positive electrode cover 11 and the positive electrode active material 16 .

[0056] Further references Figures 2 to 6As shown, the gasket 20 is circular, and the positive electrode ring 15 includes a through-hole 153 provided on the bottom wall 151. The gasket 20 is disposed within the through-hole 153 of the positive electrode ring 15. Specifically, the outer diameter d1 of the substrate 22 is smaller than the inner diameter of the through-hole 153 of the positive electrode ring 15. This allows a portion of the positive electrode active material 16 to be confined within the protrusion 21 of the gasket 20, while a portion of the positive electrode active material 16 remains in contact with the positive electrode cap 11 through the gap between the positive electrode ring 15 and the gasket 20, thereby maintaining the discharge stability of the button cell 100.

[0057] Furthermore, the inventors discovered through research that the ratio of the outer diameter d1 of the substrate 22 of the gasket 20 to the inner diameter d2 of the positive electrode ring 15 has an appropriate range of ratios. Within this range, the gasket 20 provides a stable position-restricting effect on the positive electrode active material 16. The ratio of the outer diameter d1 of the substrate 22 to the inner diameter d2 of the positive electrode ring 15 is 2:3 to 5:7. When the ratio of the outer diameter d1 of the substrate 22 to the inner diameter d2 of the positive electrode ring 15 is less than 2:3, the size of the gasket 20 is too small, and the gasket 20 can only retain a small portion of the positive electrode active material 16, resulting in insufficient fixation of the gasket 20 on the positive electrode active material 16, which in turn affects the stability of the internal structure of the button cell 100 under extreme usage conditions. When the ratio of the outer diameter d1 of the substrate 22 to the inner diameter d2 of the positive electrode ring 15 is greater than 5:7, the spacing between the gasket 20 and the positive electrode ring 15 is too small, resulting in an excessively small contact area between the bottom wall 151 of the positive electrode ring 15 and the positive electrode cover 11, thereby affecting the stability of the connection between the positive electrode ring 15 and the positive electrode cover 11, and further affecting the stability of the positive electrode active material 16 inside the button battery 100.

[0058] In a preferred embodiment, the inner diameter d2 of the positive electrode ring 15 is set to 12 mm to 14 mm. The inventors have discovered that when the inner diameter d2 of the positive electrode ring 15 is less than 12 mm, the capacity of the positive electrode active material 16 that can be accommodated within the inner cavity of the positive electrode ring 15 is limited, thereby affecting the capacitance of the button battery 100. When the inner diameter d2 of the positive electrode ring 15 is greater than 14 mm, it is not conducive to the miniaturization design of the button battery 100.

[0059] like Figure 8As shown, the inventors have discovered through research that when the inner diameter d2 of the positive electrode ring 15 is within the above range, the outer diameter d1 of the substrate 22 is set to 8 mm to 10 mm. When the outer diameter d1 of the substrate 22 is less than 8 mm, the size of the gasket 20 is too small, and the gasket 20 can only limit a small portion of the positive electrode active material 16. This makes the gasket 20 insufficient in securing the positive electrode active material 16, thereby affecting the stability of the internal structure of the button cell 100 under extreme operating conditions. When the outer diameter d1 of the substrate 22 is greater than 10 mm, the gap between the gasket 20 and the positive electrode ring 15 is too small, resulting in an insufficient contact area between the bottom wall 151 of the positive electrode ring 15 and the positive electrode cap 11. This in turn affects the stability of the connection between the positive electrode ring 15 and the positive electrode cap 11, further affecting the stability of the positive electrode active material 16 within the button cell 100.

[0060] Further references Figures 2 to 4 As shown, the gasket 20 and the positive electrode ring 15 are both configured as a centrally symmetrical structure, and the center point of the gasket 20 coincides with the center point of the positive electrode ring 15 .

[0061] The gasket 20 is set to a centrally symmetrical structure, and the positive electrode ring 15 is correspondingly set to a centrally symmetrical structure. The center of the gasket 20 coincides with the center of the positive electrode ring 15, so that the circumferential limiting force provided by the gasket 20 to the positive electrode active material 16 is set symmetrically about the center of the positive electrode active material 16, which is beneficial to maintaining the internal stability of the positive electrode active material 16. At the same time, setting the gasket 20 to a centrally symmetrical structure is beneficial to the assembly of the gasket 20.

[0062] In addition to being circular, the base plate 22 of the gasket 20 may also be configured in other polygonal structures. Suitable polygonal structures include triangles, quadrilaterals, pentagons, hexagons, and the like.

[0063] When the positive electrode ring 15 is configured as a non-centrosymmetric structure, correspondingly, the substrate 22 of the gasket 20 may also be configured as a non-centrosymmetric structure.

[0064] Further references Figure 7 and Figure 8 As shown, the gasket 20 is provided with a positioning hole 23 , and the positioning hole 23 is used for positioning the gasket 20 and the positive electrode cover 11 when being welded.

[0065] During the assembly process of the button battery 100, the positive electrode cover 11 is placed in the jig using a vibration plate loading method. By providing a positioning hole 23 on the gasket 20, the jig can conveniently clamp the gasket 20 through the positioning hole 23, thereby maintaining the position alignment between the gasket 20 and the positive electrode cover 11. At the same time, during the laser welding process, the above-mentioned positioning hole 23 facilitates the alignment of the laser probe, thereby achieving stable and efficient welding between the positive electrode cover 11 and the gasket 20.

[0066] In a preferred embodiment, the center point of the positioning hole 23 coincides with the center point of the button battery 100. The inventors have found that when the outer diameter d1 of the substrate 22 is set to 8 mm to 10 mm, the inner diameter d3 of the positioning hole 23 is 2 mm to 6 mm. In a specific embodiment, the inner diameter d3 of the positioning hole 23 can be 3 mm, 4 mm, 5 mm, or any value between or within a range between any two of the above values.

[0067] When the inner diameter d3 of the positioning hole 23 is less than 2 mm, it is not convenient for the jig to quickly clamp the gasket 20, which affects the assembly efficiency. When the inner diameter d3 of the positioning hole 23 is greater than 6 mm, the welding area between the substrate 22 of the gasket 20 and the positive electrode cover 11 is small, which in turn affects the stability of the welding between the gasket 20 and the positive electrode cover 11.

[0068] Further references Figure 8 、 Figure 9a 、 Figure 9b as well as Figure 9c As shown, in addition to being circular, the positioning hole 23 can also be configured as other polygonal structures, where suitable polygonal structures include triangles, quadrilaterals, pentagons, hexagons, and the like.

[0069] In the embodiment of the present invention, a method for forming the gasket 20 and a method for assembling the gasket 20 into the interior of the button battery 100 are further provided. Figure 10 As shown, the gasket 20 is formed by a stamping process, and during the stamping process, a strip coil is formed by connecting the edges of the material. The strip coil is transferred to a laser welding device for cutting to form a single gasket 20. The cut gasket 20 is fixed to the positive electrode cover 11 by a jig, and the gasket 20 and the positive electrode cover 11 are welded by laser welding.

[0070] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, based on the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A button battery, characterized in that: include: positive electrode cap; A positive electrode ring, wherein an active material receiving area is provided in the positive electrode ring; A gasket is connected to the positive electrode cover and is located in the active material receiving area, wherein the gasket is provided with a circumferentially closed protrusion structure, and the protrusion structure is used to fix the active material.

2. The button battery according to claim 1, characterized in that The gasket includes a substrate connected to the positive electrode cover, and the protruding structure is arranged on the edge of the substrate.

3. The button battery according to claim 1 or 2, characterized in that: The height of the protruding structure is h, and h is set to 0.1 mm to 5 mm.

4. The button battery according to claim 2, characterized in that The angle formed by the extension line of the outer section of the protruding structure and the plane where the substrate is located is in the range of 90° to 150°.

5. The button battery according to claim 2, characterized in that The substrate is configured as a circular structure, the positive electrode ring is provided with a through hole in the active material receiving area, and the substrate is located in the through hole.

6. The button battery according to claim 5, characterized in that The ratio of the outer diameter of the substrate to the inner diameter of the positive electrode ring is 2:3 to 5:

7.

7. The button battery according to claim 5 or 6, characterized in that: The inner diameter range of the positive electrode ring is set to 12mm to 14mm.

8. The button battery according to claim 7, characterized in that The outer diameter of the substrate is set to range from 8 mm to 10 mm.

9. The button battery according to claim 1, wherein: The gasket and the positive electrode ring are both arranged to have a central symmetrical structure, and the center point of the gasket coincides with the center point of the positive electrode ring.

10. The button battery according to claim 9, characterized in that: The gasket is provided with a positioning hole, and the positioning hole is used for positioning the gasket when welding with the positive electrode cover.

11. The button battery according to claim 10, characterized in that The center point of the positioning hole coincides with the center point of the button battery, and the inner diameter range of the positioning hole is set to 2mm to 6mm.

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