CN219998364U - Cylindrical battery with end favorable for packaging - Google Patents

Abstract

The utility model provides a cylindrical battery with an end favorable for packaging, which comprises a shell and a top cover assembly, wherein the shell comprises a shell main body, an annular roller groove and an annular connecting part, one end of the shell main body is open and is cylindrical, the top cover assembly comprises a sealing piece and an upper cover, one end of the sealing piece is provided with an annular sealing part, the edge of the open end of the upper cover is provided with a rolling part, the sealing part and the rolling part are both positioned in a recess of the roller groove, the sealing part is extruded between the rolling part and the roller groove, the rolling part is in sealing connection with the roller groove, and the rolling part is tightly connected with the roller groove. And the rolling parts are provided with more than three and distributed along the circumferential direction of the upper cover, so that all the rolling parts can be rolled simultaneously, and packaging can be completed by one-time rolling, and the operation is convenient. And the arrangement of the rolling parts above three makes the open end of the upper cover not easy to generate folds during packaging, the upper cover not easy to deform, the assembly tightness between the top cover component and the shell is ensured to be good, and the packaging of the battery end part is facilitated.

Description

Cylindrical battery with end favorable for packaging

Technical Field

The utility model relates to the technical field of batteries, in particular to a cylindrical battery with an end part favorable for packaging.

Background

The cylindrical battery comprises a top cover assembly and a shell, in the prior art, most of post-process sealing of the cylindrical battery is performed by inwards curling and packaging the edge of a port of the shell, and in order to achieve a sealing effect, the curling surface is required to be perpendicular to the side wall of the shell and multiple curling and pressing are required to complete packaging of the end part of the battery. The individual post-process seal of the cylindrical battery is formed by inwardly curling and sealing a circle of edges of the opening end of the side wall of the top cover assembly, and the whole circle of edges of the opening end of the side wall of the top cover assembly is curled, so that the whole circle of edges are curled and folded easily, the opening end of the top cover assembly is deformed, and the assembly tightness of the top cover assembly and the shell is affected. Both of these post-process sealing methods are not conducive to the encapsulation of the battery ends.

Disclosure of Invention

The utility model provides a cylindrical battery with an end part favorable for packaging, which can solve the problem of inconvenient packaging of the end part of the conventional cylindrical battery.

The technical scheme of the utility model is as follows: the utility model provides a cylindrical battery with end parts beneficial to packaging, which comprises a shell and a top cover assembly;

the shell comprises a shell main body, an annular roller groove and an annular connecting part, wherein one end of the shell main body is open and is cylindrical, the shell main body, the roller groove and the connecting part are sequentially connected along the axial direction of the shell main body, and the roller groove is concave relative to the shell main body and the connecting part;

the top cover assembly comprises an upper cover and a sealing piece, wherein the upper cover is cylindrical, one end of the upper cover is open, the sealing piece is annular, and the sealing piece is positioned in the upper cover; one end of the sealing element is provided with an annular sealing part; the edge of the opening end of the upper cover is provided with rolling parts, and the rolling parts are provided with more than three and are distributed along the circumferential direction of the upper cover; the connecting portion is located in the sealing piece and is connected with the inner wall of the sealing piece, the sealing portion and all rolling portions are located in the pits of the roller grooves, the sealing portion is extruded between the rolling portions and the roller grooves, and the rolling portions are insulated from the roller grooves.

Further, the junction of roller groove with connecting portion is the fillet structure, and is corresponding, sealing portion for with the fillet form that the fillet structure is laminated mutually, the portion of rolling up be with the fillet form that sealing portion is laminated mutually.

Further, in the radial direction of the upper cover, the size of the recess of the roller groove is 2-3 times the size of the crimping portion.

Further, the rolling part and the upper cover are integrally formed by stamping, and the sealing part and the sealing piece are integrally formed by injection molding.

Further, in the radial direction of the upper cover, the size of the crimping part is 2.5-3.5 times of the thickness of the side wall of the upper cover.

Further, all the crimping portions are arc-shaped curved along the circumferential direction of the upper cover.

Further, all the crimping portions are uniformly and alternately distributed along the circumferential direction of the upper cover.

Further, in the circumferential direction of the upper cover, the size of each of the crimping portions is larger than the size of the interval between the adjacent two crimping portions.

Further, the roller groove comprises an annular limiting part, a tubular connecting wall and an annular clamping part, wherein the limiting part, the connecting wall and the clamping part are sequentially connected along the axial direction of the shell main body, the outer edge of the limiting part is connected with the opening end of the shell main body, and the outer edge of the clamping part is connected with one end part of the connecting part;

the sealing part is attached to the surface of the clamping part, which faces the shell main body.

Further, the cylindrical battery with the end favorable for packaging further comprises a PTC (positive temperature coefficient) sheet and a rupture disc, wherein the PTC sheet and the rupture disc are both positioned in the upper cover, and the rupture disc is close to an opening of the upper cover relative to the PTC sheet;

the sealing piece comprises a tubular outer wall, a connecting ring, a tubular inner wall and a limiting ring, wherein the sealing part is arranged on the outer wall, the end part of the outer wall, which is opposite to the opening far from the upper cover, is connected with the outer edge of the connecting ring, the other end part of the outer wall, the end part of the inner wall, which is opposite to the opening far from the upper cover, is connected with the inner edge of the connecting ring, and the end part of the inner wall, which is opposite to the opening near the upper cover, is connected with the outer edge of the limiting ring; the edge of the rupture disc and the edge of the PTC sheet are clamped between the inner end surface of the sealing end of the upper cover and the limiting ring, and the edge of the rupture disc and the edge of the PTC sheet are abutted against the inner wall; the connecting part is clamped between the inner wall and the outer wall and is abutted with the connecting ring; the limiting ring is clamped between the edge of the rupture disc and the roller groove.

Compared with the prior art, the utility model has the beneficial effects that: because the roller groove is concave in shape relative to the shell main body and the connecting part, the sealing part and the rolling part are both positioned in the concave of the roller groove, the sealing part is extruded between the rolling part and the roller groove, the sealing part enables the rolling part to be in sealing connection with the roller groove, the rolling part is tightly connected with the roller groove in a buckling structure, and then the top cover component is tightly connected with the shell. And the rolling part is insulated from the roller groove, so that the upper cover is insulated from the shell, and the battery forms polarity insulation. And the rolling parts are provided with more than three and distributed along the circumference of the upper cover, so that all the rolling parts can be rolled and pressed simultaneously, and the packaging can be completed by one-time rolling, so that the operation is convenient, and the packaging of the end part of the battery is facilitated. And the arrangement of the rolling parts above three makes the open end of the upper cover difficult to generate folds during packaging, so that the open end of the upper cover is difficult to deform, the assembly tightness between the top cover component and the shell is ensured to be good, and the packaging of the battery end part is facilitated.

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 cross-sectional view of a cylindrical battery with end portions facilitating packaging provided in a preferred embodiment of the present utility model.

Fig. 2 is a cross-sectional view of the sealed end of the cylindrical battery of fig. 1 with the end portion thereof advantageously encapsulated.

Fig. 3 is an enlarged view of the structure of the portion a in fig. 1.

Fig. 4 is a schematic view of the structure of the cylindrical battery of fig. 1 with the end portion thereof advantageous for packaging.

Fig. 5 is a schematic view of the cylindrical battery of fig. 1 from another angle with the end portion advantageous for packaging.

Fig. 6 is a schematic structural view of a top cap assembly of the cylindrical battery of fig. 1 with an end portion thereof advantageous for encapsulation.

Fig. 7 is an exploded view of the cap assembly of fig. 6.

Fig. 8 is a cross-sectional view of the cap assembly of fig. 6.

Fig. 9 is an exploded view of the end-facilitated packaged cylindrical battery of fig. 1.

The device comprises a top cover assembly 1, a top cover assembly 2, a shell 3, a PTC sheet 4, a rupture disc 5 and a battery cell;

11. upper cover 12, sealing element 21, shell main body 22, roller groove 23, connecting part 24, round angle structure 41, concave part 42, explosion wire 51, first tab 52, second tab 53, insulating sheet 54, and open hole;

111. the sealing device comprises a rolling part, 112, a cover plate, 113, a packaging wall, 114, a boss, 115, an exhaust hole, 121, a sealing part, 122, an outer wall, 123, a connecting ring, 124, an inner wall, 125, a limiting ring, 221, a limiting part, 222, a connecting wall, 223 and a clamping part;

1251. first bulge, 1252, second bulge.

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, such as "inner", "outer" and "side", used herein are merely referring to the orientation of the drawings for the purpose of illustration and understanding of the present utility model, 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 term "connected" is to be construed broadly, and for example, may be a fixed connection, may be a removable connection, or may be an integral unit; 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 and 2, a cylindrical battery with an end portion advantageous for packaging is provided in a preferred embodiment of the present utility model, which includes a housing 2 and a top cap assembly 1, wherein the top cap assembly 1 is located at an opening of the housing 2, and the two form a sealing structure.

The housing 2 includes a housing main body 21 having an opening at one end and a cylindrical shape, an annular roller groove 22, and an annular connecting portion 23, the housing main body 21, the roller groove 22, and the connecting portion 23 being sequentially connected in the axial direction of the housing main body 21, the roller groove 22 being concave with respect to the housing main body 21 and the connecting portion 23; the top cover assembly 1 comprises an upper cover 11 and a sealing piece 12, wherein the upper cover 11 is in a cylinder shape with one end open, the sealing piece 12 is in a ring shape, and the sealing piece 12 is positioned in the upper cover 11; one end of the seal member 12 is provided with an annular seal portion 121; the edge of the opening end of the upper cover 11 is provided with a rolling part 111, and the rolling part 111 is provided with more than three rolling parts and is distributed along the circumferential direction of the upper cover 11; the connection portion 23 is located in the seal 12 and connected to the inner wall of the seal 12, the seal portion 121 and all the crimping portions 111 are located in the recesses of the roll grooves 22, the seal portion 121 is pressed between the crimping portions 111 and the roll grooves 22, and the crimping portions 111 are insulated from the roll grooves 22.

Because the roller groove 22 is concave relative to the housing main body 21 and the connecting portion 23, the sealing portion 121 and the rolling portion 111 are both positioned in the concave of the roller groove 22, the sealing portion 121 is pressed between the rolling portion 111 and the roller groove 22, the sealing portion 121 enables the rolling portion 111 to be in sealing connection with the roller groove 22, the rolling portion 111 and the roller groove 22 form a buckling structure, the connection of the rolling portion 111 and the roller groove 22 is tight, and then the top cover assembly 1 and the housing 2 are tightly connected. And the crimping part 111 is insulated from the roller groove 22 so that the upper cover 11 is insulated from the case 2, and the battery forms a polarity insulation. And the rolling parts 111 are provided with more than three and distributed along the circumferential direction of the upper cover 11, so that all the rolling parts 111 can be rolled and pressed at the same time, and the packaging can be completed by one rolling, so that the operation is convenient, and the packaging of the end part of the battery is facilitated. And the arrangement of the rolling parts 111 makes the open end of the upper cover 11 difficult to generate wrinkles during packaging, so that the open end of the upper cover 11 is difficult to deform, the assembly tightness between the top cover component 1 and the shell 2 is ensured to be good, and the packaging of the battery end part is facilitated.

The connection part of the roller groove 22 and the connecting part 23 is a round corner structure 24, and the round corner structure 24 is convenient for punching and forming and convenient for manufacturing; correspondingly, the sealing part 121 is in a round angle shape which is attached to the round angle structure 24, no gap exists between the sealing part 121 and the round angle structure 24, and the sealing effect is good; the rolling part 111 is in a shape of a round corner attached to the sealing part 121, and the shape of the rolling part is matched with the round corner structure 24, so that the rolling part 111 and the roller groove 22 can form a buckling structure conveniently, and the round corner is formed conveniently by stamping.

Referring to fig. 3, in the radial direction of the upper cover 11, the size L1 of the recess of the roller groove 22 is 2-3 times the size L2 of the crimp 111. The smaller the dimension of L2 relative to L1, the less stable the engagement structure of the crimping portion 111 and the roller groove 22, and the less stable the connection of the top cover assembly 1 and the housing 2. However, the larger the dimension of L2 relative to L1, the deeper the crimp 111 enters the recess of the roller groove 22, and the more difficult the crimping of the crimp 111 during packaging. Therefore, in the radial direction of the upper cover 11, setting the dimension of L1 to 2 to 3 times the dimension of L2 is a preferred embodiment.

The rolling part 111 and the upper cover 11 are integrally formed by stamping, the rolling part 111 is formed by bending the opening edge of the upper cover 11 by stamping, and the upper cover 11 and the rolling part 111 are firmly connected and are convenient to manufacture by stamping. The sealing part 121 and the sealing piece 12 are integrally molded by injection molding, and the sealing piece 12 and the sealing part 121 are firmly connected and are convenient to manufacture by injection molding.

Referring to fig. 2, in the present embodiment, the sealing portion 121 protrudes from the rolling portion 111 in the radial direction of the upper cover 11, the rolling portion 111 is not in direct contact with the roller groove 22, the sealing portion 121 plays an insulating role, and the battery forms a polar insulation.

In other embodiments, the crimp may be flush with the seal in the radial direction of the upper cover, which is smaller in size and saves material.

The size of the crimp 111 in the radial direction of the upper cover 11 is 2.5 to 3.5 times the thickness of the side wall of the upper cover 11. The rolling part 111 is buckled on the roller groove 22, if the size of the rolling part 111 is too small relative to the thickness of the side wall of the upper cover 11, the buckling effect of the rolling part 111 is poor, and the connection between the top cover assembly 1 and the shell 2 is unstable; if the size of the crimp portion 111 is too large relative to the thickness of the side wall of the housing 2, the crimp portion 111 is not easily bent, and the manufacturing is inconvenient. The size of the crimp 111 is set to 2.5 to 3.5 times the thickness of the side wall of the upper cover 11 in the radial direction of the upper cover 11 as a preferred embodiment.

Referring to fig. 4 and 5, all the crimping portions 111 are arc-shaped curved along the circumferential direction of the upper cover 11. In the circumferential direction of the upper cover 11, the size of the crimping part 111 is larger, the buckling effect with the roller groove 22 is better, and the top cover assembly 1 is more firmly connected with the housing 2.

In other embodiments, the rolling portion may be tapered, and the rolling portion may be smaller in size in the circumferential direction of the upper cover, so as to facilitate rolling.

All the rolling parts 111 are uniformly and alternately distributed along the circumferential direction of the upper cover 11, the rolling parts 111 can be prevented from being mutually overlapped by interval arrangement, the rolling parts 111 have a certain thickness, and if the rolling parts 111 are mutually overlapped, the rolling parts 111 and the sealing parts 121 can be possibly not attached, so that the tightness is affected. All the rolling parts 111 are uniformly distributed along the circumferential direction of the upper cover 11, and buckling structures formed by the rolling parts 111 and the roller grooves 22 are uniformly distributed along the circumferential direction of the upper cover 11, so that the edge of the opening end of the upper cover 11 can be tightly connected with the shell 2 for a whole circle.

In the circumferential direction of the upper cover 11, the size of each crimp 111 is larger than the size of the interval between the adjacent two crimps 111, the interval between the adjacent two crimps 111 is narrow, and it is possible to avoid a large gap from occurring between the top cap assembly 1 and the housing 2 at the interval, so that the sealing is not good.

In the present embodiment, three rolling parts 111 are provided, so that the number is small, and the manufacturing is convenient. In the circumferential direction of the upper cover 11, the size of the opening end edge of the upper cover 11 is 4 to 5 times the size of each crimping portion 111, and the greater the crimping portion 111 is, the more tightly the upper cover 11 is buckled with the housing 2, but the greater the crimping portion 111 is, the more inconvenient the crimping of the crimping portion 111 is, and the manufacturing is inconvenient. It is preferable to set the size of the opening end edge of the upper cover 11 to 4 to 5 times the size of each crimp 111 in the circumferential direction of the upper cover 11.

Referring to fig. 2, the roller groove 22 includes an annular limiting portion 221, a tubular connecting wall 222, and an annular clamping portion 223, the limiting portion 221, the connecting wall 222, and the clamping portion 223 are sequentially connected along an axial direction of the housing main body 21, an outer edge of the limiting portion 221 is connected with an open end of the housing main body 21, an outer edge of the clamping portion 223 is connected with one end of the connecting portions 23, and the sealing portion 121 is attached to a surface of the clamping portion 223 facing the housing main body 21. On the axial section of the housing main body 21, the roller groove 22 is integrally formed in a U shape, so that the roller groove 22 is formed by punching, and the manufacturing is facilitated.

In other embodiments, the inner edge of the limiting part and the inner edge of the clamping part can be directly connected without a connecting wall, and the roller groove is wholly V-shaped on the axial section of the shell main body, thereby being beneficial to saving materials and reducing cost.

The shell main body 21 is formed by deep drawing, the side wall of the shell main body is perpendicular to the sealing end face of the shell main body, and the axial section of the shell main body 21 is U-shaped, so that the shell main body is convenient to manufacture.

Referring to fig. 6, the upper cover 11 includes a cover plate 112 and a tubular sealing wall 113, one end of the sealing wall 113 is connected with the edge of the cover plate 112, the other end is provided with a rolling part 111, the cover plate 112 protrudes towards the direction away from the sealing wall 113 to form a boss 114 for connecting with a polarity terminal of an external circuit, and the boss 114 is provided with an exhaust hole 115, so that when gas exists in the battery, the gas can be exhausted through the exhaust hole 115, and the use is safe.

The vent 115 may be circular, square, oval, star-shaped, etc., with a square being preferred. Alternatively, the vent hole 115 may be formed in a different shape, and the shape may be used as a product characteristic mark.

The upper cover 11 is preferably made of stainless steel, which is sturdy and durable, or other hardware materials.

The material of the sealing member 12 may be preferably any of plastic materials such as PP (polypropylene), PI (polyimide), and PS (polystyrene).

The melting point of the sealing member 12 is preferably 100 to 500 ℃, and when the internal temperature of the battery increases (generally not more than 100 ℃), the sealing member 12 will not melt, and leakage of liquid can be prevented, and the use is safe.

Referring to fig. 7, the cylindrical battery with the end portion favorable for packaging further includes a PTC sheet 3 and a rupture sheet 4, wherein the PTC sheet 3 and the rupture sheet 4 are both positioned in the upper cover 11, and the rupture sheet 4 is close to the opening of the upper cover 11 relative to the PTC sheet 3; when the internal temperature of the battery increases, the PTC sheet 3 greatly increases the battery resistance to interrupt the current; when the internal pressure of the battery exceeds a predetermined level, the pressure presses against the rupture disk 4, and the rupture disk 4 can be notched, thereby achieving rapid venting of the gas.

The rupture disk 4 is a conductive film structure, the rupture disk 4 forms a concave part 41 towards the direction close to the opening of the upper cover 11, an annular bursting wire 42 is arranged on the concave part 41, when the internal pressure of the battery exceeds a preset level, the pressure is pressed against the bursting wire 42, and the breaking of the bursting wire 42 is accelerated, so that the rapid gas discharge is realized.

In this embodiment, the blasting wires 42 are provided in one piece, which is convenient for manufacturing.

In other embodiments, a plurality of blasting wires can be provided, the blasting wires are easier to break, and the gas is further discharged rapidly.

The sealing member 12 comprises a tubular outer wall 122, a connecting ring 123, a tubular inner wall 124 and a limiting ring 125, wherein the outer wall 122 is connected with the outer edge of the connecting ring 123 relative to the end part far from the opening of the upper cover 11, the other end part is provided with a sealing part 121, the inner wall 124 is connected with the inner edge of the connecting ring 123 relative to the end part far from the opening of the upper cover 11, and the inner wall 124 is connected with the outer edge of the limiting ring 125 relative to the end part near to the opening of the upper cover 11; the edge of the rupture disc 4 and the edge of the PTC sheet 3 are clamped between the inner end face of the sealing end of the upper cover 11 and the limiting ring 125, and the edge of the rupture disc 4 and the edge of the PTC sheet 3 are abutted against the inner wall 124; the connecting portion 23 is clamped between the inner wall 124 and the outer wall 122 and abuts against the connecting ring 123; the stop ring 125 is clamped between the edge of the rupture disk 4 and the roller groove 22. The outer wall 122, the connecting ring 123 and the inner wall 124 are connected to form a U-shaped structure, the connecting portion 23 can be clamped in the U-shaped structure, and when the top cover assembly 1 is assembled with the housing 2, the top cover assembly 1 can be fixed, so that the subsequent rolling and pressing portion 111 is convenient. When putting PTC piece 3 and rupture disk 4 in upper cover 11, inner wall 124 plays spacing effect to PTC piece 3 and rupture disk 4, and when assembling top cap subassembly 1, PTC piece 3 and rupture disk 4 need not the tool spacing, and the equipment is convenient. The limiting ring 125 can prevent the PTC sheet 3 and the rupture disc 4 from moving along the axial direction of the upper cover 11, and prevent the PTC sheet 3 and the rupture disc 4 from falling out of the opening of the upper cover 11.

Referring to fig. 8, in the present embodiment, a first protrusion 1251 is disposed on a surface of the stop collar 125 facing the opening of the upper cover 11, the first protrusion 1251 is annular surrounding the stop collar 125, and the first protrusion 1251 is used for interference fit with the roller groove 22, so as to enhance the tightness between the top cover assembly 1 and the housing 2, and reduce the risk of battery leakage.

The surface facing into the upper cover 11 on the limiting ring 125 is provided with a second bulge 1252, the second bulge 1252 is annular surrounding the limiting ring 125 and is in interference fit with the rupture disk 4, and the tightness between the limiting ring 125 and the rupture disk 4 is enhanced.

Referring to fig. 9, the cylindrical battery with the end portion beneficial to packaging further includes a battery core 5, the battery core 5 is located in the housing main body 21, the battery core 5 is used for storing electric energy, the battery core 5 is coiled or laminated, the coiled battery core 5 is easy to weld, and production control is convenient; the laminated cell 5 has high energy density, flexible volume and convenient assembly.

The two ends of the battery core 5 are connected with a first tab 51 and a second tab 52, and the first tab 51 and the second tab 52 are used for conveying electric quantity of the battery core 5. The first tab 51 is welded to the recess 41, and the second tab 52 is welded to the inner end surface of the sealed end of the housing 2, and the welding mode may be spot bottom resistance welding, double-needle resistance welding, laser welding, or the like.

Both ends of the battery cell 5 are provided with insulating sheets 53, the insulating sheets 53 insulate both ends of the battery cell 5 from the housing main body 21, openings 54 are formed in both insulating sheets 53, the first tab 51 passes through the opening 54 of one insulating sheet 53 to be connected with the concave part 41, and the second tab 52 passes through the opening 54 of the other insulating sheet 53 to be connected with the sealed inner end surface of the housing main body 21.

The insulating sheet 53 is preferably made of any plastic material such as PP (polypropylene), PI (polyimide), or PS (polystyrene)

When the top cover assembly 1 is assembled, the PTC sheet 3, the rupture disc 4 and the sealing piece 12 are stacked and assembled in sequence into the upper cover 11, and the inner wall 124, the PTC sheet 3 and the rupture disc 4 form a limiting assembly structure; then welding the PTC sheet 3 and the rupture disc 4 in sequence; the attachment ring 123 engages the cover plate 112 and the stop ring 125 engages the edge of the rupture disk 4 to form an integral part of the cap assembly 1.

When the top cover assembly 1 and the shell 2 are assembled, the battery cell 5 is firstly arranged in the shell main body 21, the roller groove 22 is formed after the side wall of the shell 2 is processed, the section of the roller groove 22 is similar to a U shape, or a V shape is also possible, and the U shape is preferable; the roller groove 22 comprises a limiting part 221 and a clamping part 223, and the joint of the clamping part 223 and the connecting part 23 is a round corner structure 24; the connecting part 23 is arranged in a U-shaped structure formed by the outer wall 122, the connecting ring 123 and the inner wall 124, the U-shaped structure plays roles of insulation and limitation, and the connecting part 23 and the upper cover 11 form polar insulation; secondly, dropwise adding electrolyte; finally, the packaged battery is rolled, three rolling parts 111 are formed at the edge of the opening end of the rolling upper cover 11 and drive the end edge of the sealing piece 12 to be inwards bent to form a sealing part 121, the rolling parts 111 are in interference fit with the sealing part 121, the sealing part 121 is directly buckled on the round corner structure 24, and the three rolling parts 111 are indirectly buckled on the round corner structure 24 to form a buckling structure, so that the upper cover 11 assembly cannot fall off from the shell 2; the first protrusion 1251 is in interference fit with the housing 2, and the second protrusion 1252 is in interference fit with the rupture disk 4, so that a cylindrical battery with a reliably sealed and insulated buckling structure is obtained.

In summary, although the present utility model has been described in terms of the preferred embodiments, the above-mentioned embodiments are not intended to limit the utility model, and those skilled in the art can make various modifications and alterations without departing from the spirit and scope of the utility model, so that the scope of the utility model is defined by the appended claims.

Claims (10)

1. A cylindrical battery with an end portion that facilitates packaging, characterized in that: comprises a shell and a top cover assembly;

the shell comprises a shell main body, an annular roller groove and an annular connecting part, wherein one end of the shell main body is open and is cylindrical, the shell main body, the roller groove and the connecting part are sequentially connected along the axial direction of the shell main body, and the roller groove is concave relative to the shell main body and the connecting part;

the top cover assembly comprises an upper cover and a sealing piece, wherein the upper cover is cylindrical, one end of the upper cover is open, the sealing piece is annular, and the sealing piece is positioned in the upper cover; one end of the sealing element is provided with an annular sealing part; the edge of the opening end of the upper cover is provided with rolling parts, and the rolling parts are provided with more than three and are distributed along the circumferential direction of the upper cover; the connecting portion is located in the sealing piece and is connected with the inner wall of the sealing piece, the sealing portion and all rolling portions are located in the pits of the roller grooves, the sealing portion is extruded between the rolling portions and the roller grooves, and the rolling portions are insulated from the roller grooves.

2. The end-facilitated packaged cylindrical battery of claim 1, wherein: the roll groove with the junction of connecting portion is the fillet structure, and is corresponding, sealing portion be with the fillet form that the fillet structure is laminated mutually, roll up the pressure portion for with sealing portion is laminated fillet form mutually.

3. The end-facilitated packaged cylindrical battery of claim 1, wherein: in the radial direction of the upper cover, the size of the concave part of the roller groove is 2-3 times of the size of the rolling part.

4. The end-facilitated packaged cylindrical battery of claim 1, wherein: the rolling part and the upper cover are integrally formed by stamping, and the sealing part and the sealing piece are integrally formed by injection molding.

5. The end-facilitated packaged cylindrical battery of claim 4, wherein: in the radial direction of the upper cover, the size of the rolling part is 2.5-3.5 times of the thickness of the side wall of the upper cover.

6. The end-facilitated packaged cylindrical battery of claim 1, wherein: all the rolling parts are arc strips which are bent along the circumferential direction of the upper cover.

7. The end-facilitated packaged cylindrical battery according to any one of claims 1-6, wherein: all the crimping parts are uniformly and alternately distributed along the circumferential direction of the upper cover.

8. The end-facilitated packaged cylindrical battery of claim 7, wherein: in the circumferential direction of the upper cover, the size of each of the crimping portions is larger than the size of the interval between two adjacent crimping portions.

9. The end-facilitated packaged cylindrical battery according to any one of claims 1-6, wherein: the roller groove comprises an annular limiting part, a tubular connecting wall and an annular clamping part, wherein the limiting part, the connecting wall and the clamping part are sequentially connected along the axial direction of the shell main body, the outer edge of the limiting part is connected with the opening end of the shell main body, and the outer edge of the clamping part is connected with one end part of the connecting part;

the sealing part is attached to the surface of the clamping part, which faces the shell main body.

10. The end-facilitated packaged cylindrical battery according to any one of claims 1-6, wherein: the cylindrical battery with the end favorable for packaging further comprises a PTC (Positive temperature coefficient) sheet and a rupture disc, wherein the PTC sheet and the rupture disc are both positioned in the upper cover, and the rupture disc is close to an opening of the upper cover relative to the PTC sheet;

the sealing piece comprises a tubular outer wall, a connecting ring, a tubular inner wall and a limiting ring, wherein the sealing part is arranged on the outer wall, the end part of the outer wall, which is opposite to the opening far from the upper cover, is connected with the outer edge of the connecting ring, the other end part of the outer wall, the end part of the inner wall, which is opposite to the opening far from the upper cover, is connected with the inner edge of the connecting ring, and the end part of the inner wall, which is opposite to the opening near the upper cover, is connected with the outer edge of the limiting ring; the edge of the rupture disc and the edge of the PTC sheet are clamped between the inner end surface of the sealing end of the upper cover and the limiting ring, and the edge of the rupture disc and the edge of the PTC sheet are abutted against the inner wall; the connecting part is clamped between the inner wall and the outer wall and is abutted with the connecting ring; the limiting ring is clamped between the edge of the rupture disc and the roller groove.