CN219917535U

CN219917535U - High-capacity cylindrical secondary battery

Info

Publication number: CN219917535U
Application number: CN202321447547.7U
Authority: CN
Inventors: 周攀; 陈航
Original assignee: Luhua Zhifu Electronics Shenzhen Co ltd
Current assignee: Luhua Zhifu Electronics Shenzhen Co ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2023-10-27
Anticipated expiration: 2033-06-07

Abstract

The present utility model provides a high-capacity cylindrical secondary battery including a case and a cap assembly. The shell comprises a main cylinder and an end piece, and the end piece is connected to one end of the main cylinder. The cap subassembly includes apron and rivet, and the apron includes top cap and insulating piece, and the top cap is connected in the other end of main section of thick bamboo, and the middle part of top cap is provided with the through-hole, and the insulating piece is annular, and its rubber coating moulds plastics around the through-hole, rivet and apron riveting, and the head of rivet is located the one side of apron back to the end piece, and the insulating piece is worn to locate by the nail pole of rivet, and the rivet has the joint reason, and its joint is in the one side that the apron is close to the end piece, and the joint reason is formed by the nail pole tip deformation of rivet, and rivet and top cap isolation setting. According to the high-capacity cylindrical secondary battery, the rivet is riveted with the cover plate, the main cylinder does not need to be provided with the roller groove, the occupation of the height space of the main cylinder can be avoided, and the battery energy density is higher.

Description

High-capacity cylindrical secondary battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a high-capacity cylindrical secondary battery.

Background

Secondary batteries are widely used in solar light fixtures, lawn light fixtures, backup energy sources, electric tools, and toy models. The secondary battery in the prior art includes a case, a top cover, a PTC element, a rupture disc, and a sealing ring. The top cover, the PTC element and the rupture disk are stacked together in sequence, the sealing ring is wrapped outside the top cover, the PTC element, the rupture disk and the sealing ring are packaged by crimping the shell, and meanwhile, the shell forms a roller groove. The secondary battery of the prior art has a low energy density due to the fact that the roll groove occupies a part of the height space.

It is desirable to provide a large-capacity cylindrical secondary battery to solve the above-mentioned problems.

Disclosure of Invention

The utility model provides a high-capacity cylindrical secondary battery, wherein a roller groove is not required to be arranged on a main cylinder, so that the occupation of the height space of the main cylinder can be avoided, and the energy density of the battery is higher.

The technical scheme of the utility model is as follows:

a large-capacity cylindrical secondary battery, comprising:

a housing comprising a main barrel and an end piece, the end piece being connected to one end of the main barrel; the method comprises the steps of,

the nut cap assembly comprises a cover plate and a rivet, wherein the cover plate comprises a top cover and an insulating sheet, the top cover is connected to the other end of the main cylinder, a through hole is formed in the middle of the top cover, the insulating sheet is annular, the rubber coating of the insulating sheet is injected and molded around the through hole, the rivet is riveted with the cover plate, the head of the rivet is located on one side, opposite to the end piece, of the cover plate, a nail rod of the rivet penetrates through the insulating sheet, the rivet is provided with a clamping edge, the clamping edge is clamped to one side, close to the end piece, of the cover plate, the clamping edge is formed by deformation of the end part of the nail rod of the rivet, and the rivet is isolated from the top cover.

In the high-capacity cylindrical secondary battery according to the present utility model, the shank end portion of the rivet has a blind hole before the deformation thereof, and the depth direction of the blind hole is identical to the longitudinal direction of the shank of the rivet.

In the high-capacity cylindrical secondary battery, a plurality of notch grooves are formed in the end of the shank of the rivet, and each notch groove is communicated with the blind hole.

In the large-capacity cylindrical secondary battery according to the present utility model, the notch groove has an isosceles trapezoid shape, and the opening size of the notch groove gradually increases from the direction closer to the head of the rivet to the direction farther from the head of the rivet.

In the large-capacity cylindrical secondary battery according to the present utility model, the shank of the rivet is of a solid structure.

In the high-capacity cylindrical secondary battery, a plurality of pouring holes are formed in the top cover, the pouring holes surround the through holes, the insulating sheet comprises an inner section, an outer section and a plurality of connecting columns, the inner section is connected to one side, close to the end piece, of the top cover, the outer section is connected to one side, opposite to the end piece, of the top cover, the connecting columns are filled in the pouring holes, and the inner section and the outer section are connected.

In the high-capacity cylindrical secondary battery, a limit groove is formed in one side, opposite to the end piece, of the top cover, the through hole is formed in the bottom of the limit groove, the diameter of the through hole is smaller than that of the limit groove, and the outer section is located in the limit groove.

In the high-capacity cylindrical secondary battery, one side of the top cover, which is close to the end piece, is provided with an L-shaped spigot groove at the edge, and one end of the main cylinder is positioned in the spigot groove.

In the high-capacity cylindrical secondary battery, the cap assembly further comprises a explosion-proof piece, the top cover is provided with a step-shaped liquid injection hole, and the explosion-proof piece is positioned in the liquid injection hole.

In the high-capacity cylindrical secondary battery, an annular explosion-proof wire is arranged on one side of the top cover, which is close to the end piece.

Compared with the prior art, the utility model has the beneficial effects that: according to the high-capacity cylindrical secondary battery, the insulating sheet is encapsulated and molded on the top cover, the insulating sheet and the top cover form the cover plate, the rivet penetrates through the cover plate, the end part of the rivet rod of the rivet is formed into the clamping edge, the rivet is riveted with the cover plate, and the insulating sheet plays a role in sealing and isolating the rivet and the top cover. The main cylinder of the high-capacity cylindrical secondary battery does not need to be provided with the roller groove, so that the high space of the main cylinder can be prevented from being occupied, and the energy density of the battery is higher.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments are briefly described below, and the drawings in the following description are only drawings corresponding to some embodiments of the present utility model.

Fig. 1 is a schematic cross-sectional structure of a secondary battery in the related art.

Fig. 2 is a schematic view showing the overall structure of a large-capacity cylindrical secondary battery according to a first preferred embodiment of the present utility model.

Fig. 3 is a schematic view showing a partial structure of a large-capacity cylindrical secondary battery according to a first preferred embodiment of the present utility model.

Fig. 4 is a schematic cross-sectional structure of a cap plate of a large-capacity cylindrical secondary battery according to a first preferred embodiment of the present utility model.

Fig. 5 is a schematic view showing an exploded structure of a cap plate of a large-capacity cylindrical secondary battery according to a first preferred embodiment of the present utility model.

Fig. 6 is a schematic view showing a structure before deformation of a rivet for a large-capacity cylindrical secondary battery according to a first preferred embodiment of the present utility model.

Fig. 7 is a schematic cross-sectional structure view of a cap assembly of a large-capacity cylindrical secondary battery according to a second preferred embodiment of the present utility model.

Fig. 8 is a schematic cross-sectional structure view of a cap assembly of a large-capacity cylindrical secondary battery according to a third preferred embodiment of the present utility model.

Wherein the identification of fig. 1 is as follows:

10. a shell, 101, a roller groove, 20, a top cover, 30, PTC elements, 40, a rupture disk, 50 and a sealing ring,

the labels of fig. 2-6 are as follows:

11. a housing 111, a main cylinder 112, an end piece,

12. the cap assembly is provided with a cap assembly,

121. the cover plate is provided with a plurality of grooves,

1211. top cap 12111, through hole 12112, pouring hole 12113, spigot groove 12114, pouring hole,

1212. insulating sheets 12121, inner sections 12122, outer sections 12123, connecting posts,

122. rivets, 1221, snap-fit edges 1222, blind holes, 1223, notched grooves,

123. the anti-explosion sheet is arranged on the inner side of the cylinder,

the identification of fig. 7 is as follows:

21. the cap assembly is provided with a cap assembly,

211. a top cover is arranged on the upper surface of the top cover,

212. the outer section of the outer section is provided with a plurality of grooves,

the identification of fig. 8 is as follows:

31. the cap assembly is provided with a cap assembly,

311. top cap 3111, explosion proof line.

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

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 present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, a secondary battery in the related art includes a case 10, a top cover 20, a PTC element 30, a rupture disk 40, and a sealing ring 50. The top cap 20, the PTC element 30 and the rupture disk 40 are sequentially stacked together, the sealing ring 50 is wrapped outside the three, and the case 10 is curled, the top cap 20, the PTC element 30, the rupture disk 40 and the sealing ring 50 are sealed, and the case 10 forms a roller groove 101. The secondary battery of the related art has a low energy density because the roll groove 101 occupies a part of the height space.

The following is a preferred embodiment of a large-capacity cylindrical secondary battery which solves the above technical problems.

Referring to fig. 2 to 6, a first preferred embodiment of the present utility model provides a large-capacity cylindrical secondary battery including a case 11 and a cap assembly 12. The housing 11 includes a main cylinder 111 and an end piece 112, and the end piece 112 is connected to one end of the main cylinder 111. The cap assembly 12 includes a cover plate 121 and rivets 122, the cover plate 121 including a top cover 1211 and insulating sheets 1212. The top cover 1211 is connected to the other end of the main cylinder 111, a through hole 12111 is provided in the middle of the top cover 1211, and the insulating sheet 1212 is ring-shaped and is injection-molded around the through hole 12111. The insulating sheet 1212 is PP, PE or other plastic material. The rivet 122 is riveted with the cover plate 121, the head of the rivet 122 is positioned on one side of the cover plate 121 opposite to the end piece 112, and the shank of the rivet 122 penetrates through the insulating piece 1212. The rivet 122 has a locking edge 1221 locked to a side of the cover plate 121 near the end piece 112, the locking edge 1221 is formed by deforming an end portion of the shank of the rivet 122, and the rivet 122 is spaced apart from the top cover 1211. The end tab 112 and the rivet 122 are two electrodes of a large-capacity cylindrical secondary battery, respectively. Rivet 122 and housing 11 are stainless steel or other hardware.

According to the high-capacity cylindrical secondary battery, the insulating sheet 1212 is encapsulated and molded on the top cover 1211, the two sheets form the cover plate 121, the rivet 122 penetrates through the cover plate 121, and the end part of the rivet 122 is formed into the clamping edge 1221, so that the rivet 122 is riveted with the cover plate 121, and the insulating sheet 1212 plays a role in sealing and isolating the rivet 122 and the top cover 1211. The large-capacity cylindrical secondary battery of the present utility model, in which the main cylinder 111 does not need to be provided with a roller groove, can avoid occupying the height space of the main cylinder 111, and can make the battery energy density higher.

Referring to fig. 6, the shank end of the rivet 122 has a blind hole 1222 before deformation, and the depth direction of the blind hole 1222 is identical to the length direction of the shank of the rivet 122. With this structure, the end of the shank of the rivet 122 is deformed.

With continued reference to fig. 6, the end of the shank of the rivet 122 is provided with a plurality of notch grooves 1223, each notch groove 1223 communicating with the blind hole 1222. With this structure, the shank end of the rivet 122 is more easily turned over during press-riveting.

With continued reference to fig. 6, the notch 1223 is isosceles trapezoid, and the opening size of the notch 1223 gradually increases from the head of the rivet 122 to the head of the rivet 122. In the above structure, the plurality of notch grooves 1223 divide the end of the shank of the rivet 122 into a plurality of segments, and the isosceles trapezoid notch grooves 1223 make the end of each segment narrower, which is easier to turn over and press rivet. In other embodiments, the notch groove 1223 may be V-shaped or U-shaped.

In other embodiments, the shank of rivet 122 may be a solid structure. The structure is convenient for processing.

Referring to fig. 4 and 5, a plurality of pouring holes 12112 are formed in the top cover 1211, and the plurality of pouring holes 12112 evenly surrounds the through holes 12111, and the number of pouring holes 12112 is 5 in the embodiment. The insulating sheet 1212 includes an inner section 12121, an outer section 12122, and a plurality of connecting posts 12123, the inner section 12121 being connected to a side of the top cover 1211 adjacent to the end sheet 112, the outer section 12122 being connected to a side of the top cover 1211 opposite the end sheet 112, the plurality of connecting posts 12123 being filled in the plurality of pouring holes 12112 and connecting the inner section 12121 and the outer section 12122. In the above structure, the connection post 12123 can enhance the adhesion between the top cover 1211 and the insulating sheet 1212 to improve sealing performance.

Referring to fig. 4, the top cover 1211 is provided with an L-shaped spigot 12113 at the edge thereof near one side of the end piece 112, and one end of the main tube 111 is located in the spigot 12113. The top cover 1211 is welded to the main cylinder 111. With the above structure, the spigot groove 12113 forms an assembly limit with the main tube 111, so that the top cover 1211 and the main tube 111 can be assembled accurately, and the top cover 1211 can be prevented from being eccentric due to external factors during welding. In other embodiments, a spigot groove may be provided at one end of the main barrel 111, or both the edge of the top cover 1211 and one end of the main barrel 111.

Referring to fig. 3 and 4, the cap assembly 12 further includes a bursting disc 123, and the top cap 1211 is provided with a stepped injection hole 12114, and the injection hole 12114 is wider at the top and narrower at the bottom. The explosion proof plate 123 is located in a wide portion of the liquid injection hole 12114. With the above structure, the edge welds the explosion-proof plate 123 in the liquid-filling hole 12114. Meanwhile, when the internal pressure of the battery exceeds a predetermined level, the pressure is pressed against the explosion-proof plate 123, and the disconnection of the explosion-proof plate 123 is accelerated, thereby realizing rapid gas discharge inside the battery and improving safety performance.

The large-capacity cylindrical secondary battery further includes a battery cell, a first tab, and a second tab, all of which are located in the main can 111. The first tab and the second tab are both connected to the battery cell, and the first tab is welded with the rivet 122, and the second tab is welded with the terminal plate 112.

Referring to fig. 7, a cap assembly 21 of a high-capacity cylindrical secondary battery according to a second preferred embodiment of the present utility model is provided. The difference between this embodiment and the large-capacity cylindrical secondary battery of the first embodiment is that a limit groove is provided on the side of the top cover 211 facing away from the end piece, a through hole is located at the bottom of the limit groove, the diameter of the through hole is smaller than that of the limit groove, and the outer section 212 is located in the limit groove. With the above structure, the thickness of the cap assembly 21 can be reduced, and the capacity density of the battery can be improved.

Referring to fig. 8, a cap assembly 31 of a large-capacity cylindrical secondary battery according to a third preferred embodiment of the present utility model is different from the large-capacity cylindrical secondary battery according to the first embodiment in that an annular explosion-proof wire 3111 is disposed on a side of the top cap 311 close to the end piece. With the above structure, when the internal pressure of the battery exceeds a predetermined level, the pressure is pressed to the top cover 311 to accelerate the disconnection of the explosion-proof wire 3111, thereby realizing the rapid exhaust of the gas inside the battery, improving the safety performance, eliminating the need for additional explosion-proof sheets, and facilitating the processing.

The assembly process of the large-capacity cylindrical secondary battery according to the first preferred embodiment of the present utility model:

1. the insulating sheet 1212 is encapsulated and injection-molded on the top cover 1211, glue solution is injected into the pouring hole 12112 to form a connecting column 12123, and the insulating sheet 1212 and the top cover 1211 form a cover plate 121;

2. the rivet 122 penetrates through the cover plate 121, and the end part of the rivet stem of the rivet 122 is formed into a clamping edge 1221, so that the rivet 122 is riveted with the cover plate 121;

3. the top cover 1211 is welded with the housing 11 by circumferential welding;

4. electrolyte is injected through the injection hole 12114, and the explosion-proof plate 123 is welded in the injection hole 12114.

Thus, the assembly process of the large-capacity cylindrical secondary battery of the first preferred embodiment is completed.

According to the high-capacity cylindrical secondary battery, the insulating sheet is encapsulated and molded on the top cover, the insulating sheet and the top cover form the cover plate, the rivet penetrates through the cover plate, the end part of the rivet rod of the rivet is formed into the clamping edge, the rivet is riveted with the cover plate, and the insulating sheet plays a role in sealing and isolating the rivet and the top cover. The main cylinder of the high-capacity cylindrical secondary battery does not need to be provided with the roller groove, so that the high space of the main cylinder can be prevented from being occupied, and the energy density of the battery is higher.

In summary, although the present utility model has been described with reference to the preferred embodiments, the scope of the utility model is not limited thereto, and any person skilled in the art who is skilled in the art should make equivalent substitutions or modifications according to the technical scheme of the present utility model within the scope of the present utility model.

Claims

1. A large-capacity cylindrical secondary battery, characterized by comprising:

2. The high-capacity cylindrical secondary battery according to claim 1, wherein the shank end of the rivet has a blind hole before deformation thereof, the depth direction of the blind hole being identical to the length direction of the shank of the rivet.

3. The large-capacity cylindrical secondary battery according to claim 2, wherein a shank end portion of the rivet is provided with a plurality of cutout grooves, each of which communicates with the blind hole.

4. The large-capacity cylindrical secondary battery according to claim 3, wherein the notch groove has an isosceles trapezoid shape, and an opening size of the notch groove becomes gradually larger from a direction closer to the head of the rivet to a direction farther from the head of the rivet.

5. The large-capacity cylindrical secondary battery according to claim 1, wherein the shank of the rivet is of a solid structure.

6. The high-capacity cylindrical secondary battery according to claim 1, wherein the top cover is provided with a plurality of pouring holes, the plurality of pouring holes are surrounded around the through holes, the insulating sheet comprises an inner section, an outer section and a plurality of connecting posts, the inner section is connected to a side of the top cover close to the end piece, the outer section is connected to a side of the top cover facing away from the end piece, and the plurality of connecting posts are filled in the plurality of pouring holes and connect the inner section and the outer section.

7. The high-capacity cylindrical secondary battery according to claim 6, wherein a limit groove is provided on a side of the top cover facing away from the end piece, the through hole is located at a bottom of the limit groove, a diameter of the through hole is smaller than a diameter of the limit groove, and the outer section is located in the limit groove.

8. The high-capacity cylindrical secondary battery according to claim 1, wherein the top cover is provided with an L-shaped spigot groove at an edge thereof on a side thereof adjacent to the end tab, and one end of the main tube is located in the spigot groove.

9. The high capacity cylindrical secondary battery according to claim 1, wherein the cap assembly further comprises a bursting disc, the top cover being provided with a stepped liquid filling hole, the bursting disc being located in the liquid filling hole.

10. The high-capacity cylindrical secondary battery according to claim 1, wherein the top cover is provided with an annular explosion-proof wire on a side thereof adjacent to the end tab.