CN218939833U

CN218939833U - Winding type button cell with ruffle structure

Info

Publication number: CN218939833U
Application number: CN202222618841.1U
Authority: CN
Inventors: 周攀; 陈航
Original assignee: Luhua Zhifu Electronics Dongguan Co ltd
Current assignee: Luhua Zhifu Electronics Dongguan Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-04-28
Anticipated expiration: 2032-09-30

Abstract

The utility model provides a winding type button cell with a ruffled structure, which comprises a shell, an upper cover, a sealing ring and an electric core. The shell is tubular structure, and one end of shell is provided with first opening. The upper cover is of a cylindrical structure, and one end of the upper cover is provided with a second opening. One end of the upper cover, which is close to the second opening, is positioned in the shell, and the other end of the upper cover protrudes out of the first opening or is flush with the first opening. The sealing ring is connected between the shell and the upper cover in a sealing way, and the battery cell is arranged in the upper cover and is of a multi-layer winding type battery cell structure. The housing includes a hem structure formed by bending an edge of the housing adjacent the first opening toward an inner wall of the housing. The hem structure includes a first contact surface in contact with the inner wall of the housing.

Description

Winding type button cell with ruffle structure

Technical Field

The utility model relates to the field of batteries, in particular to a button battery.

Background

In modern society, a battery is a device that converts chemical energy into electrical energy. The traditional button cell needs to be sealed by adopting a roll-pressing packaging process, and after roll-pressing packaging, the shell of the button cell forms a curled edge structure. The position of the hemming structure occupies part of the space of the anode and cathode materials of the battery, so that the battery capacity is low, and the daily and lunar markets and the demands of clients cannot be met. And because the shell is steel shell structure and the influence of the rolling packaging technology, the production efficiency of the battery is lower.

It is desirable to provide a wound button cell with a hem structure that solves the above-mentioned problems.

Disclosure of Invention

The utility model provides a winding type button battery with a ruffled structure, which can improve the battery capacity and the production efficiency of the battery.

The utility model provides a winding type button cell with a ruffled structure, which comprises:

a shell which is in a cylindrical structure, and one end of the shell is provided with a first opening;

the upper cover is in a cylindrical structure, one end of the upper cover is provided with a second opening, one end of the upper cover, which is close to the second opening, is positioned in the shell, and the other end of the upper cover protrudes out of or is flush with the first opening;

the sealing ring is connected between the shell and the upper cover in a sealing way; the method comprises the steps of,

the battery cell is arranged in the upper cover and is of a multi-layer winding type battery cell structure;

one end of the first tab is connected with the battery cell, and the other end of the first tab is connected with the shell;

one end of the second lug is connected with the battery cell, and the other end of the second lug is connected with the upper cover;

the shell comprises a ruffle structure, the ruffle structure is formed by bending the edge, close to the first opening, of the shell towards the inner wall of the shell, the ruffle structure comprises a first contact surface, the first contact surface is in contact with the inner wall of the shell, and the ruffle structure is arranged on the shell, so that the package of a post-process hemming is omitted.

In the wound button cell with the ruffle structure of the utility model, the ruffle structure further comprises a second contact surface adjacent to the first contact surface, the second contact surface facing a side facing away from the first opening; the sealing ring comprises a first connecting surface, the first connecting surface is positioned at one end of the sealing ring, the first connecting surface is in butt joint with the first contact surface, and the sealing ring is used for being firmly connected with the shell.

In the coiled button cell with the ruffle structure, the ruffle structure further comprises a third contact surface, the third contact surface faces the upper cover, the sealing ring further comprises a protrusion, the protrusion is connected with the first connecting surface, the protrusion is abutted with the third contact surface, and the sealing ring is firmly connected with the shell.

In the coiled button cell with the ruffle structure, the sealing ring comprises a boss, the boss and the first connecting surface are arranged at one end of the boss, the boss and the first connecting surface are opposite to each other and are close to the first opening, the boss comprises an inclined surface, an included angle formed by the inclined surface and the first connecting surface is smaller than 90 degrees, the inclined surface is positioned between the boss and the upper cover, the upper cover comprises an inclined part, the inclined part is positioned on the side wall of the upper cover, the extending direction of the inclined part is the same as the extending direction of the inclined surface, the inclined surface is abutted against the inclined part, the upper cover is in snap connection with the boss, the sealing ring is firmly connected with the upper cover, and the inner space of the upper cover is enlarged.

In the coiled button cell with the ruffle structure, the sealing ring comprises a clamping groove, the clamping groove is arranged at one end of the sealing ring, which is far away from the first connecting surface, and the clamping groove is in buckling connection with the edge of the upper cover, which is close to the second opening, so that the sealing ring and the upper cover are firmly connected.

In the winding type button cell with the ruffle structure, the button cell comprises a pressure relief valve, wherein the pressure relief valve is arranged at the other end of the shell relative to the first opening and is used for performing explosion-proof operation on the button cell.

In the winding type button cell with the ruffle structure, the shell is provided with the third opening, the button cell comprises the pressure release sheet, and the pressure release sheet is welded at the third opening to form the pressure release valve.

In the winding type button cell with the ruffle structure, the shell is provided with the fourth opening, the button cell comprises the plastic explosion-proof film, and the plastic explosion-proof film is hot-pressed and fused at the fourth opening to form the pressure release valve.

In the winding type button cell with the ruffle structure, the pressure relief valve and the shell are of an integrated structure, a first annular pressure relief groove is formed in the inner side of the shell, a second annular groove is formed in the outer side of the shell, the first groove and the second groove are both formed along the circumferential direction of the pressure relief valve, and the diameter of the second groove is larger than that of the first groove.

In the wound button cell with the ruffle structure, the outermost battery cell comprises a first part and a second part which are connected with each other, the first part is connected to the inside of the upper cover, the upper cover further comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are both positioned on the side wall of the upper cover, the first connecting part is connected to one end of the inclined part, which is close to the second opening, the second connecting part is connected to one end of the inclined part, which is far away from the second opening, and the second part is positioned in a cavity formed by the inclined part and the first connecting part and is used for increasing the energy density of the battery.

Compared with the prior art, the utility model has the beneficial effects that: the utility model provides a winding type button cell with a ruffled structure, which comprises a shell, an upper cover, a sealing ring and an electric core. One end of the upper cover is positioned in the shell, the other end of the upper cover protrudes out of the first opening or is flush with the first opening, and the sealing ring is connected between the shell and the upper cover in a sealing way. The electric core is arranged in the upper cover, and the electric core is of a multi-layer winding type electric core structure. The housing includes a hem structure formed by bending an edge of the housing adjacent the first opening toward an inner wall of the housing. The hem structure includes a first contact surface in contact with the inner wall of the housing. The shell ruffle structure is formed by bending the edge of the shell towards the inner diameter ruffle, so that the manufacturing process of the button cell is simple, and the structural reliability of the button cell is strong.

The wound button cell with the hem structure can optimize the structure and the processing technology of the casing relative to the traditional button cell. The shell of the button cell forms a circle of ruffled structure in the inner cavity of the shell through ruffled process. When the battery is installed, a user firstly installs the sealing ring and the battery core into the upper cover to form a component, then installs the component into the shell, and then the user performs lamination packaging on the battery through the jig. Wherein, the ruffle structure forms the knot position structure with the sealing washer, with the sealing washer spacing in the shell. In this process, the user can save the process of crimping the package. Therefore, the winding type button cell with the ruffle structure has simpler assembly process, and effectively solves the technical problems of difficult assembly and low production efficiency in the manufacturing process of the traditional button cell. The hem structure occupies less space relative to the hem structure. Therefore, the button cell is provided with a larger space for accommodating the battery core, so that the energy density of the cell can be increased.

Drawings

Fig. 1 is a perspective view of a rolled button cell having a hem structure according to the present utility model.

Fig. 2 is one of sectional views of the internal structure of a rolled button cell having a hem structure according to the present utility model.

Fig. 3 is a second cross-sectional view of the internal structure of a wound button cell having a hem structure according to the present utility model.

Fig. 4 is an enlarged view at a of fig. 3.

Fig. 5 is a cross-sectional view of the internal structure of a wound button cell having a hem structure according to the present utility model.

Fig. 6 is an enlarged view at B of fig. 5.

Fig. 7 is a schematic plan view of a cell of a wound button cell having a hem structure according to the present utility model.

Fig. 8 is a schematic plan view of the outermost cell of a wound button cell having a ruffled structure according to the utility model.

In the figure, 10, a button cell; 11. a housing; 111. a hem structure; 1111. a first contact surface; 1112. a second contact surface; 1113. a third contact surface; 12. an upper cover; 121. an inclined portion; 122. a first connection portion; 123. a second connecting portion; 13. a seal ring; 131. a first connection surface; 132. a protrusion; 133. a boss; 134. an inclined surface; 135. a clamping groove; 14. a battery cell; 141. an outermost cell; 1411. a first portion; 1412. a second portion; 15. a pressure release valve; 151. a first groove; 152. and a second groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms of directions used in the present utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are used for explaining and understanding the present utility model only with reference to the orientation of the drawings, and are not intended to limit the present utility model.

The words "first," "second," and the like in the terminology of the present utility model are used for descriptive purposes only and are not to be construed as indicating or implying relative importance and not as limiting the order of precedence.

In the drawings, like structural elements are denoted by like reference numerals.

Referring to fig. 1 and 2, the present utility model provides a winding type button cell with a ruffled structure, and the button cell 10 includes a housing 11, an upper cover 12, a sealing ring 13, and a battery cell 14. The housing 11 has a cylindrical structure, and a first opening is provided at one end of the housing 11. The upper cover 12 is in a cylindrical structure, and a second opening is formed at one end of the upper cover 12. One end of the upper cover 12 close to the second opening is located inside the housing 11, and the other end of the upper cover 12 protrudes from or is flush with the first opening. The seal ring 13 is connected between the housing 11 and the upper cover 12 in a sealing manner, and the battery cell 14 is arranged inside the upper cover 12. The sealing ring 13 is used for sealing and insulating the shell 11 and the upper cover 12, and sealing the battery cell 14 and the electrolyte in a space enclosed by the shell 11 and the upper cover 12. The sealing ring 13 can be injection molded by plastic material, and the preferred materials of the sealing ring 13 are polyimide, polypropylene and polyether-ether-ketone.

Referring to fig. 1 and 2, the battery cell 14 is disposed inside the upper cover 12, and the battery cell 14 is a multi-layer winding type battery cell structure. The battery cell 14 comprises a positive plate, a negative plate and a diaphragm, and the button cell 10 comprises a first tab and a second tab. The positive electrode plate and the negative electrode plate are both connected to the inside of the upper cover 12, and the diaphragm is connected between the positive electrode plate and the negative electrode plate. One end of the first tab is connected with the positive plate, and the other end of the first tab is welded with the shell 11. One end of the second lug is connected with the negative plate, and the other end of the second lug is welded with the upper cover 12.

Referring to fig. 3 and 4, the housing 11 includes a hem structure 111, and the hem structure 111 is formed by bending an edge of the housing 11 near the first opening toward an inner wall of the housing 11. The ruffle structure 111 comprises a first contact surface 1111, the first contact surface 1111 contacts with the inner wall of the housing 11, the ruffle structure 111 and the housing 11 form a tightly attached double-layer structure at the first opening, and the ruffle structure 111 can limit the sealing ring 13 and the upper cover 12 in the housing 11, so that the sealing ring 13 and the upper cover 12 cannot be separated from the first opening, and therefore, the button cell 10 can omit the process of hemming packaging.

The hem structure 111 forms a closely adhered double-layer structure with the case 12, and has an advantage of an inner space as compared with a curled hollow structure, and can save space, so that the hem structure 111 can be arranged to increase the capacity of the battery, and thus the energy density of the battery can be increased.

Because the hem structure 111 of the housing 11 replaces the existing hemming structure, the double-layered structure at the first opening is thinner in the thickness direction of the wall of the housing 11. The assembly formed by the sealing ring 13, the upper cover 12 and the battery cell 14 can be pressed into the shell 11 from the first opening by utilizing the deformation of the shell 11, and the sealing ring 13 and the upper cover 12 can be limited in the shell 11 by the ruffled structure 111. Therefore, the curling is not required to be processed after the battery is assembled, and the space of the curling structure is not required to be reserved at the periphery of the sealing ring and the upper cover, so that the battery is simpler and more convenient for a user to assemble, and the efficiency of the battery assembled by the user is effectively improved. Since the hem structure 111 of the case 11 is formed by bending the punched edge of the case 11 toward the inner diameter hem, the manufacturing process of the button cell 10 is simple, and the structural reliability of the button cell 10 is strong.

Referring to fig. 3 and 4, the conventional button cell needs to be packaged by a crimping process, and the crimping is hollow, and the position of the crimping occupies a part of the space of the anode and cathode materials of the cell, so that the capacity of the cell is reduced. To better solve this problem, the structure and the processing process of the casing 11 of the wound button cell with the ruffled structure can be optimized, and the casing 11 of the button cell 10 forms a circle of ruffled structure 111 with relatively small occupied space in the inner cavity of the casing 11 through the ruffled process. Therefore, the assembly process of the winding type button cell having the ruffled structure is simpler. The hem structure 111 can limit the sealing ring 13 and the upper cover 12 in the shell 11, so that hemming is not required to be processed after assembly, and space of the hemming structure is not required to be reserved at the periphery of the sealing ring and the upper cover. Therefore, the use rate of the internal space of the button cell 10 can be improved, so that the battery capacity can be improved.

Because the hem structure 111 is formed by bending the edge of the outer shell 11 close to the first opening towards the inner wall of the outer shell 11, the outer surface of the bent part of the hem structure 111 and the outer shell 11 is in a convex arc shape, and the convex arc shape is positioned at the first opening, thereby forming a chamfer structure, and being beneficial to loading the sealing ring 13 and the upper cover 12 into the outer shell 12 from the first opening.

Referring to fig. 3 and 4, the hem structure 111 further includes a second contact surface 1112, the second contact surface 1112 being adjacent to the first contact surface 1111. The second contact surface 1112 faces to one side facing away from the first opening, the sealing ring 13 includes a first connection surface 131, the first connection surface 131 is located at one end of the sealing ring 13, the first connection surface 131 is abutted to the first contact surface 1111, and the sealing ring 13 is firmly connected with the housing 11. Because the first connecting surface 131 abuts against the first contact surface 1111, the first contact surface 1111 limits the sealing ring 13, and effectively prevents the sealing ring 13 from falling out of the first opening, so that the sealing ring 13 is more firmly connected with the ruffle structure 111.

Further, the hem structure 111 further includes a third contact surface 1113, the third contact surface 1113 being directed toward the upper cover 12. Seal ring 13 further includes a protrusion 132, protrusion 132 being coupled to first coupling surface 131, protrusion 132 abutting third contact surface 1113. Since the protrusion 132 abuts against the third contact surface 1113 and the protrusion 132 is pressed between the hem structure 111 and the upper cover 12, the seal 13 is firmly connected to the housing 11. The protrusion 132 is annular and is disposed circumferentially between the hem structure 111 and the upper cover 12 to provide electrical isolation between the hem structure 111 and the upper cover 12.

Referring to fig. 3 and 4, the sealing ring 13 includes a boss 133, and the boss 132 and the first connecting surface 131 are disposed at one end of the boss 133. The boss 132 and the first connecting surface 131 are close to the first opening with respect to the boss 133, the boss 133 includes an inclined surface 134, and an angle formed between the inclined surface 134 and the first connecting surface 131 is smaller than 90 degrees. The inclined surface 134 is located between the boss 133 and the upper cover 12, and the upper cover 12 includes an inclined portion 121, and the inclined portion 121 is located on a side wall of the upper cover 12. The extending direction of the inclined portion 121 is the same as the extending direction of the inclined surface 134, the inclined surface 134 abuts against the inclined portion 121, and the upper cover 12 is engaged with the boss 133. Because the upper cover 12 is in snap connection with the boss 133, the sealing ring 13 is firmly connected with the upper cover 12, and the upper cover 12 can be prevented from easily loosening from the sealing ring 13. And the boss 133 may be provided to increase the inner space of the upper cover 12 so that the upper cover 12 may accommodate a larger volume of the battery cell 14. The provision of the boss 133 with the inclined surface 134 can increase the capacity of the battery, and the energy density of the battery can be increased. The boss 133 serves to fix the upper cover 12 and prevent the upper cover 12 from being released. The sealing ring 13 and the shell 11 can be in interference pre-pressing, so that the sealing ring 13 has good sealing performance.

Referring to fig. 2, the sealing ring 13 includes a clamping groove 135, the clamping groove 135 is disposed at one end of the sealing ring 13 away from the first connecting surface 131, and the clamping groove 135 is in snap connection with an edge of the upper cover 12 near the second opening. The edge of the upper cover 12 near the second opening is located inside the clamping groove 135, and the internal space of the battery can be further saved. Thus, the interior of the battery, which has a greater energy density, can accommodate a larger volume of the cells 14. Because the clamping groove 135 is in snap connection with the edge of the upper cover 12 close to the second opening, the sealing ring 13 is firmly connected with the upper cover 12.

Referring to fig. 5 and 6, the button cell 10 includes a pressure release valve 15, the pressure release valve 15 is disposed at the other end of the housing 11 opposite to the first opening, and the pressure release valve 15 is used for performing an explosion-proof operation on the button cell 10. When an abnormality such as a short circuit or overcharge occurs in the battery, air pressure is generated in the battery. If the air pressure is continuously increased, the air pressure can break through the pressure release valve 15, so that the explosion-proof effect is achieved. The relief valve 15 has three structures, and the casing 11 is provided with a third opening, and the button cell 10 includes a relief piece. The pressure release piece is welded at the third opening to form a pressure release valve 15, and the structure is a first structure of the pressure release valve 15. The casing 11 is provided with a fourth opening, and the fourth opening may be circular, square or elliptical in shape, and the button cell 10 includes a plastic rupture membrane. The plastic rupture disk is hot-pressed and fused at the fourth opening to form the pressure relief valve 15, and the structure is the second structure of the pressure relief valve 15. The relief valve 15 and the housing 11 are integrally formed, and this is a third structure of the relief valve 15. The inside of shell 11 is provided with the annular first recess 151 of pressure release, and the outside of shell 11 is provided with annular second recess 152, and first recess 151 and second recess 152 all set up along the circumference of relief valve 15, and the diameter of second recess 152 is greater than the diameter of first recess 151. Among them, fig. 5 and 6 show one preferred embodiment, and fig. 5 and 6 show a third structure of the relief valve 15.

Referring to fig. 2, 7 and 8, the battery cell 14 is a multi-layer wound battery cell structure, and the outermost battery cell 141 includes a first portion 1411 and a second portion 1412 connected to each other. The first portion 1411 is connected to the inside of the upper cover 12, and the upper cover 12 further includes a first connection portion 122 and a second connection portion 123, both of which are located on a sidewall of the upper cover 12. The first connecting portion 122 is connected to an end of the inclined portion 121 near the second opening, the second connecting portion 123 is connected to an end of the inclined portion 121 far away from the second opening, and the second portion 1412 is located in a cavity formed by the inclined portion 121 and the first connecting portion 122. Because of the cavity formed by the inclined portion 121 and the first connecting portion 122, the accommodation space inside the battery is enlarged, and the space utilization inside the battery can be further improved. Thus, the location of the second portion 1412 within the cavity may increase the energy density of the battery.

The utility model relates to an installation flow of a winding type button cell with a ruffled structure, which comprises the following steps: when the button cell 10 is mounted, a relief valve 15 is provided in the case 11. The relief valve 15 has three structures, and the casing 11 is provided with a third opening, and the button cell 10 includes a relief piece. The pressure release piece is welded at the third opening to form a pressure release valve 15, and the structure is a first structure of the pressure release valve 15. The casing 11 is provided with a fourth opening, and the fourth opening may be circular, square or elliptical in shape, and the button cell 10 includes a plastic rupture membrane. The plastic rupture disk is hot-pressed and fused at the fourth opening to form the pressure relief valve 15, and the structure is the second structure of the pressure relief valve 15. The relief valve 15 and the housing 11 are integrally formed, and this is a third structure of the relief valve 15. The inside of shell 11 is provided with the annular first recess 151 of pressure release, and the inside of shell 11 is provided with annular second recess 152, and first recess 151 and second recess 152 all set up along the circumference of relief valve 15, and the diameter of second recess 152 is greater than the diameter of recess.

Subsequently, the edge of the housing 11 near the first opening is bent toward the inner wall of the housing 11. The first contact surface 1111 of the hem structure 111 now contacts the inner wall of the housing 11, whereby the housing 11 forms the hem structure 111. The sealing ring 13 and the battery cell 14 are arranged in the upper cover, the second opening of the upper cover 12 faces upwards, and electrolyte is injected into the upper cover 12. Thus, the seal ring 13, the cell 14, the upper cover 12, and the electrolyte form an assembly. The first opening of the shell 11 is downward, the assembly is aligned to the assembly, and the assembly is pressed into the shell 11 through the jig, so that the button cell 10 is subjected to pressing packaging. Wherein, the ruffle structure 111 forms a buckling structure with the sealing ring 13, limiting the sealing ring 13 in the shell. In order to firmly connect the sealing ring 13 with the housing 11, the housing 11 is in interference connection with the sealing ring 13. The first connecting surface 131 of the seal ring 13 is in contact with the first contact surface 1111 of the hem structure 111, and the protrusion 132 of the seal ring 13 is in contact with the third contact surface 1113 of the hem structure 111. Next, the battery cell 14 is disposed inside the upper cover 12. The upper cover 12 is pressed into the interior of the housing 11. In order to firmly connect the upper cover 12 and the sealing ring 13, the inclined part 121 of the upper cover 12 abuts against the inclined surface 134 of the boss 133, and the clamping groove 135 on the sealing ring 13 is in snap connection with the edge of the upper cover 12 close to the second opening. In order to expand the accommodating space inside the battery, the inclined portion 121 and the first connecting portion 122 form a cavity. The outermost cell 141 includes a first portion 1411 and a second portion 1412 connected to each other, and the second portion 1412 is disposed in the cavity, so that the energy density of the button cell 10 can be increased.

The utility model provides a winding type button cell with a ruffled structure, which comprises a shell, an upper cover, a sealing ring and an electric core. One end of the upper cover is positioned in the shell, the other end of the upper cover protrudes out of the first opening or is flush with the first opening, and the sealing ring is connected between the shell and the upper cover in a sealing way. The electric core is arranged in the upper cover, and the electric core is of a multi-layer winding type electric core structure. The housing includes a hem structure formed by bending an edge of the housing adjacent the first opening toward an inner wall of the housing. The hem structure includes a first contact surface in contact with the inner wall of the housing. The shell ruffle structure is formed by bending the edge of the shell towards the inner diameter ruffle, so that the manufacturing process of the button cell is simple, and the structural reliability of the button cell is strong.

In summary, although the present utility model has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model is defined by the appended claims.

Claims

1. A wound button cell having a hem structure, comprising:

the shell comprises a ruffle structure, the ruffle structure is formed by bending the edge of the shell, which is close to the first opening, towards the inner wall of the shell, and the ruffle structure comprises a first contact surface, and the first contact surface is in contact with the inner wall of the shell.

2. The wound button cell having a hem structure of claim 1, further comprising a second contact surface adjacent to the first contact surface, the second contact surface facing a side facing away from the first opening; the sealing ring comprises a first connecting surface, the first connecting surface is positioned at one end of the sealing ring, and the first connecting surface is abutted to the first contact surface.

3. The coiled button cell having a hem structure of claim 2, further comprising a third contact surface facing the upper cover, the gasket further comprising a protrusion connected to the first connection surface, the protrusion abutting the third contact surface.

4. The coiled button cell with the ruffle structure according to claim 3, wherein the sealing ring comprises a boss, the boss and the first connecting surface are both arranged at one end of the boss, the boss and the first connecting surface are both opposite to each other, the boss comprises an inclined surface, an included angle formed by the inclined surface and the first connecting surface is smaller than 90 degrees, the inclined surface is located between the boss and the upper cover, the upper cover comprises an inclined portion, the inclined portion is located on the side wall of the upper cover, the extending direction of the inclined portion is the same as the extending direction of the inclined surface, the inclined surface is in butt joint with the inclined portion, and the upper cover is in snap connection with the boss.

5. The coiled button cell with hem structure of claim 1, wherein the sealing ring comprises a clamping groove disposed at an end of the sealing ring away from the first connection surface, the clamping groove being snap-connected with an edge of the upper cover adjacent to the second opening.

6. The wound button cell with hem structure of claim 1, comprising a pressure relief valve disposed at the other end of the housing relative to the first opening, the pressure relief valve for explosion proof operation of the button cell.

7. The wound button cell with hem structure of claim 6, wherein a third opening is provided on the housing, the button cell comprising a pressure relief tab welded to the third opening to form the pressure relief valve.

8. The coiled button cell with hem structure of claim 6, wherein a fourth opening is provided on the housing, the button cell comprising a plastic rupture membrane hot-melt at the fourth opening to form the pressure relief valve.

9. The wound button cell with ruffle structure of claim 6, wherein the pressure relief valve is integrally formed with the housing, the inner side of the housing is provided with a pressure relief annular first groove, the outer side of the housing is provided with an annular second groove, the first groove and the second groove are both disposed along the circumference of the pressure relief valve, and the diameter of the second groove is greater than the diameter of the first groove.

10. The coiled button cell having a hem structure of claim 4, wherein the outermost cell comprises a first portion and a second portion connected to each other, the first portion being connected to the interior of the upper cover, the upper cover further comprising a first connection portion and a second connection portion, both located on the side wall of the upper cover, the first connection portion being connected to the end of the inclined portion near the second opening, the second connection portion being connected to the end of the inclined portion remote from the second opening, the second portion being located in the cavity formed by the inclined portion and the first connection portion.