CN218215480U

CN218215480U - Laminated button battery with two-layer ruffle structure

Info

Publication number: CN218215480U
Application number: CN202222618883.5U
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: 2023-01-03
Anticipated expiration: 2032-09-30

Abstract

The utility model provides a lamination formula button cell with two-layer ruffle structure, this button cell include shell, upper cover, sealing washer, electric core. One end of the shell is provided with a first opening, and one end of the upper cover is provided with a second opening. One end of the upper cover 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 manner, the battery cell is arranged in the upper cover, and the battery cell is of a multilayer laminated battery cell structure. The shell comprises a first ruffle structure, and the first ruffle structure is formed by bending the edge of the shell close to the first opening towards the inner wall of the shell. The first hem structure includes a first contact surface that contacts an inner wall of the housing. The upper cover comprises a second ruffle structure, the second ruffle structure is formed by bending the edge of the upper cover close to the second opening towards the outer wall of the upper cover, the second ruffle structure comprises a second contact surface, and the second contact surface is in contact with the outer wall of the upper cover.

Description

Laminated button battery with two-layer ruffle structure

Technical Field

The utility model relates to a battery field, in particular to button cell.

Background

In modern society, a battery is a device that converts chemical energy into electrical energy. The traditional button battery needs to be sealed by adopting a rolling and pressing packaging process, and after the rolling and pressing packaging, the shell of the button battery can form a curled edge structure. The position of the edge-curling structure occupies partial space of the anode and cathode materials of the battery, so that the battery capacity is low, and the requirements of the market and customers which are different day by day cannot be met. And because the shell is the steel-clad structure and the roll-pressing packaging process influences, the production efficiency is lower.

Therefore, it is desirable to provide a laminated button cell with two-layer ruffle structure to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lamination formula button cell with two-layer ruffle structure can improve battery capacity, improves the production efficiency of battery.

The utility model provides a button cell of two-layer ruffle structure, it includes:

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

the upper cover is of 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 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 number of the first and second groups,

the battery cell is arranged inside the upper cover and is of a multilayer laminated battery cell structure;

the shell comprises a first ruffle structure, the first ruffle structure is formed by bending the edge of the shell close to the first opening towards the inner wall of the shell, and the first ruffle structure comprises a first contact surface which is in contact with the inner wall of the shell; the upper cover comprises a second ruffle structure, the second ruffle structure is formed by bending the edge, close to the second opening, of the upper cover towards the outer wall of the upper cover, the second ruffle structure comprises a second contact surface, the second contact surface is in contact with the outer wall of the upper cover, the shell and the upper cover are both provided with the ruffle structure, and therefore the post-process curled edge packaging is omitted.

In the laminated button battery with two-layer ruffle structure, the sealing washer includes the draw-in groove, the draw-in groove set up in the sealing washer is close to one side of upper cover, the embedding of second ruffle structure is in the draw-in groove for the sealing washer is connected with the upper cover and is firm to increase the inner space of upper cover.

In the laminated button battery with two-layer ruffle structure, the second ruffle structure still includes third contact surface and fourth contact surface, the third contact surface with the second contact surface is adjacent, the third contact surface orientation deviates from second open-ended one side, the fourth contact surface with the second contact surface set up respectively in the both ends that the ruffle structure is relative, the draw-in groove includes third opening, first connecting surface, second connection face, the third opening orientation the upper cover, first connecting surface with the second connection face all sets up the lateral wall of draw-in groove is inboard, first connecting surface orientation the second opening, the second connecting surface towards the upper cover, first connecting surface with third contact surface looks butt, the second connection face with fourth contact surface looks butt for the sealing washer is connected firmly with the upper cover.

In the laminated button battery with two-layer ruffle structure, the sealing washer still includes the lug, the lug with the second is connected the face and is connected, the lug includes that the third is connected the face and the fourth is connected the face, the third is connected the face orientation the first opening, the fourth is connected the face orientation the upper cover, the fourth be connected the face with the outer wall parallel and level of upper cover, the second ruffle structure still includes the fifth contact surface, the fifth contact surface with the third contact surface set up respectively in the both ends that the second ruffle structure is relative, the third be connected the face with fifth contact surface looks butt.

In the laminated button battery with two-layer ruffle structure, the sealing washer still includes the lug, the lug with the second is connected the face and is connected, the lug includes that the third is connected the face and the fourth is connected the face, the third is connected the face orientation the first opening, the fourth is connected the face orientation the upper cover, the fourth be connected the face with the inner wall parallel and level of upper cover, the second ruffle structure still includes the fifth contact surface, the fifth contact surface with the third contact surface set up respectively in the both ends that the second ruffle structure is relative, the third be connected the face with fifth contact surface looks butt.

In the laminated button battery having a two-layer ruffle structure of the present invention, the first ruffle structure further includes a sixth contact surface, the sixth contact surface is adjacent to the first contact surface, and the sixth contact surface faces a side away from the first opening; the sealing ring comprises a fifth connecting surface, and the fifth connecting surface is abutted against the sixth contact surface and is used for connecting the sealing ring and the shell stably.

In the laminated button battery with two-layer ruffle structure, the first ruffle structure still includes the seventh contact surface, the seventh contact surface orientation the upper cover, the sealing washer still includes the arch, the arch with five are connected the face and are connected, the arch with seventh contact surface looks butt for the sealing washer is connected firmly with the shell.

In the laminated button battery with two-layer ruffle structure, protruding protrusion in first opening, the arch is connected the face including the sixth, the face orientation is connected to the sixth the outer wall of upper cover, the sixth connect the face with the outer wall looks butt of upper cover.

In the laminated button battery with two-layer ruffle structure, the sealing washer still includes the seventh connection face, the seventh connection face orientation the inner wall of shell, the seventh connection face with the inner wall looks butt of shell.

In the laminated button battery with two-layer ruffle structure, the button battery further includes a pressure release valve, the pressure release valve for first opening set up in the other end of shell, perhaps the pressure release valve for the second opening set up in the other end of upper cover, the pressure release valve is used for right button battery carries out explosion-proof operation.

The utility model discloses compare in prior art, its beneficial effect is: the utility model provides a lamination formula button cell with two-layer ruffle structure, this button cell include shell, upper cover, sealing washer, 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 mode. The electric core is arranged in the upper cover and is of a multilayer laminated electric core structure. The shell comprises a first ruffle structure, and the first ruffle structure is formed by bending the edge of the shell close to the first opening towards the inner wall of the shell. The first hem structure includes a first contact surface that contacts an inner wall of the housing. The upper cover includes second hem structure, and second hem structure is close to the outer wall bending type that the second open-ended edge was covered to the upper cover by the upper cover, and second hem structure includes the second contact surface, the outer wall contact of second contact surface and upper cover. The button cell is simple in manufacturing process and high in structural reliability because the first ruffle structure is formed by bending the ruffle towards the inner wall of the shell through the edge of the shell and the second ruffle structure is formed by bending the edge of the upper cover towards the outer wall.

Compared with the traditional button cell, the laminated button cell with the two-layer ruffle structure can optimize the structure and the processing technology of the shell. According to the shell of the button battery, a circle of first ruffle structure is formed in an inner cavity of the shell through a ruffle process, and a circle of second ruffle structure is formed on the periphery of an upper cover. When the battery is installed, a user firstly installs the sealing ring and the battery core into the upper cover to form a component, and a buckling structure can be formed between the second hem structure of the upper cover and the sealing ring to ensure that the sealing ring and the upper cover are firmly connected; the user packs the subassembly into the shell again, and the user carries out pressfitting encapsulation to this battery through the tool afterwards, and first hem structure forms with the sealing washer and detains the position structure, with the spacing in the shell of sealing washer. In this process, the user can save the process of de-crimping the package. Therefore, the assembly process of the laminated button battery with the two-layer ruffle structure is simpler, and the technical problems that the traditional button battery is difficult to assemble in the manufacturing process and low in production efficiency are effectively solved. The hem structure occupies less space relative to the hem structure. Therefore, the button battery is internally provided with a larger space for accommodating the battery cell, so that the energy density of the battery can be increased. When the button battery is assembled, axial extrusion force is required to be applied to tightly press the shell, the sealing ring and the upper cover. Meanwhile, the battery core is of a multi-layer laminated battery core structure, and the multi-layer laminated battery core can be compressed by the axial extrusion force.

Drawings

Fig. 1 is a perspective view of a first embodiment of a laminated button cell with a two-layer ruffle structure according to the present invention.

Fig. 2 is one of the cross-sectional views of the internal structure of the first embodiment of the laminated button cell with two-layer ruffle structure of the present invention.

Fig. 3 is a second cross-sectional view of the internal structure of the first embodiment of the laminated button cell with two-layer ruffle structure.

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

Fig. 5 is a third cross-sectional view of the internal structure of the first embodiment of the laminated button cell with two-layer ruffle structure.

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

Fig. 7 is a schematic view of a clamping groove of a second embodiment of the laminated button cell with a two-layer ruffle structure according to the present invention.

In the figure, 10, button cell; 11. a housing; 111. a first hem structure; 1111. a first contact surface; 1112. a sixth contact surface; 1113. a seventh contact surface; 12. an upper cover; 121. a second hem structure; 1211. a second contact surface; 1212. a third contact surface; 1213. a fourth contact surface; 1214. a fifth contact surface; 13. a seal ring; 131. a card slot; 1311. a first connection face; 1312. a second connection face; 132. a bump; 1321. a third connection surface; 1322. a fourth connection face; 133. a protrusion; 1331. a sixth connection face; 134. a fifth connection face; 135. a seventh connecting surface; 14. an electric core; 15. a pressure relief valve; 151. a first groove; 152. a second groove. 21. A seal ring; 211. a second connection face; 22. a bump; 221. a third connection face; 222. a fourth connection face; 23. a second hem structure; 231. a fifth contact surface; 232. a third contact surface; 24. and (7) covering.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the present invention, the directional terms, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", refer to the orientation of the drawings, and the directional terms are used for illustration and understanding, but not for limiting the present invention.

The terms "first," "second," and the like in the terms of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor should they be construed as limiting in any way.

In the drawings, elements having similar structures are denoted by the same reference numerals.

Referring to fig. 1 and 2, the present invention provides a laminated button battery with a two-layer ruffle structure, in which the button battery 10 includes a housing 11, an upper cover 12, a sealing ring 13, and a battery cell 14. The housing 11 is a cylindrical structure, and one end of the housing 11 is provided with a first opening. The upper cover 12 is a cylindrical structure, and one end of the upper cover 12 is provided with a second opening. 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 sealing ring 13 is connected between the housing 11 and the upper cover 12 in a sealing manner, the battery cell 14 is arranged inside the upper cover 12, and the sealing ring 13 is used for sealing and insulating the housing 11 and the upper cover 12 and sealing the battery cell 14 and the electrolyte in a space enclosed by the housing 11 and the upper cover 12. The sealing ring 13 may be injection molded by plastic material, and the preferable material of the sealing ring 13 is polyimide, polypropylene, or polyetheretherketone.

Referring to fig. 1 and fig. 2, the battery cell 14 is disposed inside the upper cover 12, and the battery cell 14 is a multi-layer laminated battery cell structure. The battery cell 14 includes a positive plate, a negative plate, a diaphragm, a first tab, and a second tab, the positive plate and the negative plate are both connected inside the upper cover 12, and the diaphragm is connected between the positive plate and the negative 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 pole lug is connected with the negative plate, and the other end of the second pole lug is welded with the upper cover 12.

Referring to fig. 3 and 4, the outer shell 11 includes a first ruffle structure 111, and the first ruffle structure 111 is formed by bending an edge of the outer shell 11 near the first opening toward an inner wall of the outer shell 11. The first hem structure 111 includes a first contact surface 1111, the first contact surface 1111 being in contact with the inner wall of the housing 11. The upper cover 12 includes a second ruffle structure 121, and the second ruffle structure 121 is formed by bending an edge of the upper cover 12 close to the second opening toward an outer wall of the upper cover 12. The second ruffle structure 121 includes a second contact surface 1211, and the second contact surface 121 contacts the outer wall of the upper cover 12. The housing 11 and the upper cover 12 are each provided with a ruffled structure, so that the button cell 10 can dispense with a subsequent process of crimping. The ruffle structure has more internal space advantages than the rolled structure, so the ruffle structure can increase the capacity of the battery, and further the energy density of the button battery 10 can be increased.

Referring to fig. 3 and 4, since the housing 11 and the upper cover 12 are each provided with a ruffled structure, the ruffled structure replaces the existing hemming structure. Therefore, the double-layer structure at the first opening is thinner in the thickness direction of the wall of the case 11, and the double-layer structure at the second opening is thinner in the thickness direction of the wall of the upper cover 12. The button cell 10 can utilize the deformation of the housing and the upper cover to press the assembly of the sealing ring, the upper cover and the battery cell into the housing 11 from the first opening. Also, the first ruffle structure 111 may trap the gasket 13 in the case 11, and the second ruffle structure 121 may trap the upper cover 12 in the gasket 13. Therefore, the crimping does not need to be processed after the assembly, and the space of the crimping structure does not need to be reserved on the periphery of the sealing ring 13 and the upper cover 12, so that the internal space of the button cell 10 is enlarged, and the button cell 10 has higher energy density.

Referring to fig. 3 and 4, the first hem structure 111 and the housing 11 form a tightly attached double-layer structure at the first opening. The sealing ring 13 and the upper cover 12 can be limited in the housing 11 by the ruffle structure, so that the sealing ring 13 and the upper cover 12 cannot be separated from the first opening. The second ruffle structure 121 and the upper cover 12 form a tightly attached double-layer structure at the second opening, and the upper cover 12 can be limited on the sealing ring 13 by using the ruffle structure, so that the upper cover 12 cannot be separated from the sealing ring 13.

Referring to fig. 3 and 4, since the housing 11 and the upper cover 12 are both provided with the hem structure, when installing, a user only needs to abut the first hem structure 111 against the sealing ring 13, and the housing 11 and the sealing ring 13 can be connected firmly. The user only needs to abut the second hem structure 121 against the sealing ring 13, and the upper cover 12 and the sealing ring 13 can be firmly connected. Therefore, the battery is more simple and convenient for a user to assemble, and the efficiency of assembling the battery by the user is effectively improved. Since the first hem structure 111 is formed by bending the punched edge of the outer shell 11 to the inside diameter while the second hem structure 121 is formed by bending the punched edge of the upper cover 12 to the outside diameter. Therefore, the button cell 10 is simple in manufacturing process, and the button cell 10 has high structural reliability.

Referring to fig. 3 and 4, a conventional button cell is packaged by using a crimping process, wherein the crimping process is a hollow structure. Therefore, the position of the crimping occupies a part of the space of the positive and negative electrode materials of the battery, so that the capacity of the battery is reduced. To better solve this problem, the laminated button cell with two-layer ruffled structure can optimize the structure and processing technique of the housing 11 and the upper cover 12. The casing 11 and the upper cover 12 of the button cell 10 are pleated by a ruffling process to form a circle of first ruffle structure 111 in an inner cavity of the casing 11 and a circle of second ruffle structure 121 on an outer wall of the upper cover 12. Therefore, the assembly process of the laminated button cell with the two-layer ruffle structure is simpler. The first ruffle structure 111 may trap the sealing ring 13 in the housing 11 and the second ruffle structure 121 may trap the upper cover 12 in the sealing ring 13. Therefore, the hemming does not need to be processed after assembly, and the space of the hemming structure does not need to be reserved on the periphery of the sealing ring 13 and the upper cover 12. Therefore, the utilization rate of the internal space of the button cell 10 can be increased, so that the cell capacity can be increased.

Because the first ruffle structure is formed by bending the edge of the shell 11 close to the first opening towards the inner wall of the shell 11, the outer surface of the bending part of the first ruffle structure 111 and the shell 11 is in a convex arc shape, and the convex arc shape is positioned at the first opening, so that a chamfer angle structure is formed, and the sealing ring 13 and the upper cover 12 are favorably arranged in the shell from the first opening. Because the second ruffle structure 121 is formed by bending the edge of the upper cover 12 close to the first opening towards the inner wall of the upper cover 12, the outer surface of the bending part of the second ruffle structure 121 and the upper cover 12 is in a convex arc shape, and the convex arc shape is positioned at the second opening, thereby forming a chamfer structure and being beneficial to connecting the upper cover 12 with the sealing ring 13.

Referring to fig. 2, 3 and 4, the sealing ring 13 includes a locking groove 131, and the locking groove 131 is disposed on a side of the sealing ring 13 close to the upper cover 12. The second hem structure 121 is inserted into the catching groove 131, so that the gasket 13 is firmly coupled to the upper cap 12. Even if the button cell 10 is used for a long time, the upper cover 12 is not easily released from the gasket 13. Since the second ruffle structure 121 is embedded in the notch 131, the notch 131 can increase the internal space of the upper cover 12, which effectively increases the capacity of the button cell 10.

Referring to fig. 3 and 4, the second ruffle structure 121 further includes a third contact surface 1212 and a fourth contact surface 1213, and the third contact surface 1212 is adjacent to the second contact surface 1211. The third contact surface 1212 faces away from the second opening, and the fourth contact surface 1213 and the second contact surface 1211 are disposed at two opposite ends of the hem structure, respectively. Card slot 131 includes a third opening facing the upper cover, a first connection face 1311, and a second connection face 1312. First connection surface 1311 and second connection surface 1312 are both disposed inside a sidewall of card slot 131, first connection surface 1311 facing the second opening. The second connection surface 1312 faces the upper cover 12, the first connection surface 1311 abuts against the third contact surface 1212, and the second connection surface 1312 abuts against the fourth contact surface 1213. Since the second connection surface 1312 of the locking groove 131 abuts against the fourth contact surface 1213 of the second hem structure 121, the sealing ring 13 is tightly connected to the upper cover 12. When a user uses the button cell 10, the button cell 10 can prevent the upper cover 12 and the sealing ring 13 from being easily loosened.

Referring to fig. 2, fig. 3 and fig. 4, the sealing ring further includes a protrusion 132, the protrusion 132 is connected to the second connecting surface 1312, and the protrusion 132 includes a third connecting surface 1321 and a fourth connecting surface 1322. The third connecting surface 1321 faces the first opening, the fourth connecting surface 1322 faces the upper cover 12, and the fourth connecting surface 1322 is flush with the outer wall of the upper cover 12. If the fourth connecting surface 1322 is flush with the inner wall of the upper cover 12, the second hem structure 121 is completely inserted into the slot 131, so that the second hem structure 121 is more firmly connected with the slot 131. The second hem structure 121 further includes a fifth contact surface 1214, the fifth contact surface 1214 and the third contact surface 1212 are respectively disposed at two opposite ends of the second hem structure 121, and the third connecting surface 1321 abuts against the fifth contact surface 1214. Since the third connecting surface 1321 of the bump 133 abuts against the fifth contact surface 1214 of the second hem structure 121, the slot 131 is connected with the second hem structure 121 more tightly. Since the projection 132 is provided on the seal ring 13, the seal ring 13 has a large strength, and the seal ring 13 is also hard to be damaged.

Referring to fig. 3 and 4, the first hem structure 111 further includes a sixth contact surface 1112. The sixth contact surface 1112 is adjacent to the first contact surface 1111, the sixth contact surface 1112 facing away from the first opening. The sealing ring 13 comprises a fifth connection surface 134, and the fifth connection surface 134 abuts against the sixth contact surface 1112, so that the sealing ring 13 is firmly connected with the housing 11. Because the fifth connecting surface 134 abuts against the sixth contact surface 1112, the sixth contact surface 1112 limits the position of the sealing ring 13, and the sealing ring 13 is effectively prevented from coming out of the first opening, so that the sealing ring 13 is more stably connected with the first hem structure 111.

Referring to fig. 2, 3 and 4, the first ruffle structure 111 further includes a seventh contact surface 1113, and the seventh contact surface 1113 faces the upper cover 12. The sealing ring 13 further comprises a protrusion 133, the protrusion 133 is connected to the fifth connecting surface 134, and the protrusion 133 abuts against the seventh contact surface 1113, so that the sealing ring 13 is firmly connected to the housing 11. Since the protrusion abuts against the seventh contact surface 1113 and is connected between the first ruffle structure 111 and the upper cover 12 in a pressing manner, the sealing ring 13 is connected to the housing 11 more stably. The protrusion 133 is annular and disposed between the first ruffle structure 111 and the upper cover 12, so as to achieve electrical isolation between the first ruffle structure 111 and the upper cover 12.

Referring to fig. 2, 3 and 4, the protrusion 133 protrudes from the first opening, the protrusion 133 includes a sixth connection surface 1331, the sixth connection surface 1331 faces the outer wall of the upper cover 12, and the sixth connection surface 1331 abuts against the outer wall of the upper cover 12. Since the protrusion 133 protrudes from the first opening and abuts against the outer wall of the upper cover 12 through the sixth connection surface 1331, the protrusion 133 can better limit the upper cover 12, so that the sealing ring 13 is tightly connected with the upper cover 12. The sealing ring 13 further comprises a seventh connection surface 135, the seventh connection surface 135 faces the inner wall of the housing, and the seventh connection surface 135 abuts against the inner wall of the housing 11. Since the seal ring 13 abuts against the inner wall of the housing 11 through the seventh connecting surface 135, no gap is generated between the housing 11 and the seal ring 13, and the housing 11 and the seal ring 13 are connected more tightly.

Referring to fig. 5 and 6, the button cell 10 includes a pressure relief valve 15, and the pressure relief valve 15 is disposed at the other end of the housing 11 opposite to the first opening. Or the pressure relief valve 15 is arranged at the other end of the upper cover 12 relative to the second opening, and is used for performing 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 inside the battery. If the air pressure is continuously increased, the air pressure can burst the pressure release valve 15, so that the explosion-proof effect is achieved. The pressure release valve 15 has three structures, a third opening is arranged on the shell 11, and the button cell 10 comprises a pressure release sheet. The pressure relief sheet is welded at the third opening to form the pressure relief valve 15, and the structure is the first structure of the pressure relief valve 15. The housing 11 is provided with a fourth opening, the shape of the fourth opening can be circular, square or oval, and the button cell 10 comprises a plastic explosion-proof membrane. The plastic rupture membrane is hot-pressed and fused at the fourth opening to form the pressure release valve 15, and the structure is the second structure of the pressure release valve 15. The pressure relief valve 15 and the housing 11 are integrally formed, and this structure is the third structure of the pressure 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. Fig. 5 and 6 show one of the preferred solutions, and fig. 5 and 6 show a third structure of the pressure relief valve 15. Referring to fig. 7, fig. 7 shows a second embodiment of a button cell. The sealing ring 21 further comprises a protrusion 22, the protrusion 22 is connected with the second connection surface 211, and the protrusion 22 comprises a third connection surface 221 and a fourth connection surface 222. The third connection surface 221 faces the first opening, and the fourth connection surface 222 faces the upper cover 24. The fourth connection face 222 is flush with the outer wall of the upper cover 24. If the fourth connecting surface 222 is flush with the outer wall of the upper cover 24, the volume of the bump 22 is smaller. The bumps 22 occupy less space, so that the battery has more space inside to accommodate the battery cells, and the battery has higher energy density. And the second hem structure 23 is inserted into the catch, so that the second hem structure 23 is more securely connected with the catch.

The second ruffle structure 23 further includes a fifth contact surface 231, the fifth contact surface 231 and the third contact surface 232 are respectively disposed at two opposite ends of the second ruffle structure 23, and the third connection surface 221 abuts against the fifth contact surface 231. Since the third connecting surface 221 of the bump 22 abuts against the fifth contact surface 231 of the second hem structure 23, the slot is connected with the second hem structure 23 more tightly. Since the seal ring 21 is provided with the projection 22, the seal ring 21 has a high strength, and the seal ring 21 is also hard to be damaged.

The utility model discloses an installation flow does: when the button cell 10 is assembled, a pressure relief valve 15 is provided on the housing 11. 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 first hem structure 111 is now in contact with the inner wall of the shell 11, so that the shell 11 forms the first hem structure 111. The edge of the upper cover 12 close to the second opening is bent toward the outer wall of the upper cover 12 to form a second ruffle structure 121, and the second contact surface 1211 of the second ruffle structure 121 contacts the outer wall of the upper cover 12. Then, the seal ring 13 and the battery cell 14 are mounted in the upper cover 12, the second hem structure 121 is connected to the clamping groove 131 of the seal ring 13, the second opening of the upper cover 12 faces upward, and the electrolyte is injected into the upper cover 12. Thus, the sealing ring 13, the cell 14, the upper cover 12, and the electrolyte form an assembly. And (3) downwards facing the first opening of the shell 11, aligning the first opening with the assembly, and pressing the assembly into the shell 11 through a jig to realize press-fitting and packaging of the button cell 10. Then, the button cell 10 is mounted.

The utility model provides a lamination formula button cell with two-layer ruffle structure, this button cell include shell, upper cover, sealing washer, 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 mode. The electric core is arranged in the upper cover and is of a multilayer laminated electric core structure. The shell comprises a first ruffle structure, and the first ruffle structure is formed by bending the edge of the shell close to the first opening towards the inner wall of the shell. The first hem structure includes a first contact surface that contacts an inner wall of the housing. The upper cover comprises a second ruffle structure, the second ruffle structure is formed by bending the edge of the upper cover close to the second opening towards the outer wall of the upper cover, the second ruffle structure comprises a second contact surface, and the second contact surface is in contact with the outer wall of the upper cover. The button cell is simple in manufacturing process and high in structural reliability because the first ruffle structure is formed by bending the ruffle towards the inner wall of the shell through the edge of the shell and the second ruffle structure is formed by bending the edge of the upper cover towards the outer wall.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so that the scope of the present invention shall be determined by the scope of the appended claims.

Claims

1. A laminated button cell having a two-layer ruffle structure, comprising:

the sealing ring is connected between the shell and the upper cover in a sealing mode; and the number of the first and second groups,

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

2. The laminated button battery with a two-layer ruffle structure of claim 1, wherein the sealing ring comprises a snap groove disposed on a side of the sealing ring proximate to the upper cover, the second ruffle structure being embedded in the snap groove.

3. The laminated button cell with two-layer ruffle structure according to claim 2, wherein the second ruffle structure further comprises a third contact surface and a fourth contact surface, the third contact surface is adjacent to the second contact surface, the third contact surface faces a side away from the second opening, the fourth contact surface and the second contact surface are respectively disposed at two opposite ends of the ruffle structure, the card slot comprises a third opening, a first connection surface and a second connection surface, the third opening faces the upper cover, the first connection surface and the second connection surface are both disposed inside a sidewall of the card slot, the first connection surface faces the second opening, the second connection surface faces the upper cover, the first connection surface abuts against the third contact surface, and the second connection surface abuts against the fourth contact surface.

4. The laminated button cell with a two-layer ruffle structure of claim 3, wherein the sealing ring further comprises a protrusion connected to the second connection surface, the protrusion comprising a third connection surface facing the first opening and a fourth connection surface facing the upper cover, the fourth connection surface being flush with an outer wall of the upper cover, the second ruffle structure further comprising a fifth contact surface, the fifth contact surface and the third contact surface being respectively disposed at opposite ends of the second ruffle structure, the third connection surface abutting against the fifth contact surface.

5. The laminated button cell with a two-layer ruffle structure of claim 3, wherein the sealing ring further comprises a protrusion connected to the second connection surface, the protrusion comprising a third connection surface facing the first opening and a fourth connection surface facing the upper cover, the fourth connection surface being flush with an inner wall of the upper cover, the second ruffle structure further comprising a fifth contact surface, the fifth contact surface and the third contact surface being respectively disposed at two opposite ends of the second ruffle structure, the third connection surface abutting against the fifth contact surface.

6. The laminated button cell with a two-layer hem structure of claim 1, wherein the first hem structure further comprises a sixth contact face adjacent to the first contact face, the sixth contact face facing away from the first opening; the sealing ring comprises a fifth connecting surface, and the fifth connecting surface is abutted to the sixth contact surface.

7. The laminated button cell with a two-layer ruffle structure of claim 6, wherein the first ruffle structure further comprises a seventh contact surface facing the upper cover, the sealing ring further comprising a protrusion connected with the five connection surfaces, the protrusion abutting the seventh contact surface.

8. The laminated button cell with a two-layer ruffle structure of claim 7, wherein the protrusion protrudes out of the first opening, the protrusion comprising a sixth connection face facing the outer wall of the upper cover, the sixth connection face abutting the outer wall of the upper cover.

9. The laminated button cell with a two-layer ruffle structure of claim 1, wherein the sealing ring further comprises a seventh connection surface facing the inner wall of the housing, the seventh connection surface abutting the inner wall of the housing.

10. The laminated button cell with a two-layer ruffle structure as defined in claim 1, further comprising a pressure relief valve disposed at the other end of the housing relative to the first opening or at the other end of the upper cover relative to the second opening, wherein the pressure relief valve is configured to perform an explosion-proof operation on the button cell.