CN219419251U - Cylindrical battery convenient to assembly - Google Patents

Abstract

The utility model provides a cylindrical battery convenient to assemble, which comprises a cap assembly, a shell and a battery cell, wherein the shell comprises a cylindrical shell main body, a roller groove and a connecting pipe, the shell main body, the roller groove and the connecting pipe are sequentially connected along the axial direction of the shell, the roller groove is annular and is arranged around the shell, the roller groove is concave, and the battery cell is positioned in the shell main body. The cap assembly comprises a top cover and a sealing ring, the top cover is in a cylinder shape with one end open, the connecting pipe is positioned in the top cover, the opening edge of the top cover is bent into the roller groove to form an annular connecting part, the sealing ring is positioned in the top cover and is formed by in-mold injection molding, the sealing ring comprises an insulating part, the insulating part is tightly pressed between the roller groove and the connecting part, and the sealing ring and the top cover are formed by in-mold injection molding, so that the sealing ring is tightly connected and has strong tightness, the process of assembling the sealing ring is reduced, and the assembly is convenient; when in packaging, the insulating part hooks the inner wall of the roller groove, the connecting part hooks the insulating part, so that the packaging of the cap assembly and the shell can be realized, the rolling difficulty is low, and the assembly is convenient.

Description

Cylindrical battery convenient to assembly

Technical Field

The utility model relates to the technical field of batteries, in particular to a cylindrical battery convenient to assemble.

Background

In the prior art, the cap assembly of the cylindrical battery is formed by stacking and assembling four parts, namely a top cover, a sealing ring, a PTC (positive temperature coefficient) sheet and a rupture disk, and the parts are too many, so that assembly gaps are easily formed between the parts during stacking, and the battery is poor in tightness and has leakage risk. The existing cylindrical batteries are sealed through a post process, namely, the port edges of the shell are curled inwards to be sealed, the curled edge faces are perpendicular to the side wall of the shell, and the sealing can be finished through repeated rolling, so that the efficiency is low during manufacturing, and the requirements of the market and clients which are different from each other in daily life cannot be met.

Disclosure of Invention

The utility model provides a cylindrical battery convenient to assemble, which can solve the problems of poor tightness and inconvenient packaging of the traditional cylindrical battery.

The technical scheme of the utility model is as follows: the utility model provides a cylindrical battery convenient to assemble, which comprises a cap assembly, a shell and a battery cell;

the shell comprises a cylindrical shell main body, a roller groove and a connecting pipe, wherein the shell main body, the roller groove and the connecting pipe are sequentially connected along the axial direction of the shell; the roller groove is annular and is arranged around the shell, the roller groove is concave relative to the connecting pipe and the shell main body, and the battery cell is positioned in the shell main body;

the cap assembly comprises a top cover and a sealing ring, wherein the top cover is cylindrical, one end of the top cover is open, the connecting pipe is positioned in the top cover, and the opening edge of the top cover is bent into the roller groove to form an annular connecting part; the sealing ring is positioned in the top cover, and the sealing ring and the top cover are integrally formed by in-mold injection molding; the sealing ring comprises a sealing ring main body and an annular insulating part, one end of the sealing ring main body is connected with the insulating part, and the insulating part is close to the shell main body relative to the sealing ring main body; the sealing ring main body is connected between the connecting pipe and the side wall of the top cover, and the insulating part is pressed between the roller groove and the connecting part and isolates the connecting part from the roller groove.

Further, a through hole is formed in the top cover, and a protrusion filled into the through hole is arranged on the sealing ring.

Further, the top cover comprises a cover plate and a tubular top cover side wall, the cover plate is connected to one end of the top cover side wall, the other end of the top cover side wall is bent to form the connecting part, and at least one of the peripheral edge of the cover plate and the top cover side wall is provided with the through hole; the protrusions are arranged in all the through holes;

the sealing ring further comprises annular limiting parts, the limiting parts and the insulating parts are respectively located at two ends of the sealing ring main body, the limiting parts are far away from the shell main body relative to the insulating parts, and the limiting parts are attached to the outer edges of the cover plates and clamped between the cover plates and the connecting pipes.

Further, the sealing ring further comprises a tubular gear portion, one end of the gear portion is connected with the inner edge of the limiting portion, the limiting portion is far away from the shell main body relative to the gear portion, and the connecting pipe is clamped between the sealing ring main body and the gear portion.

Further, the cap assembly further includes a PTC sheet and a rupture disc, both positioned within the gear portion, the PTC sheet being connected between the cover sheet and the rupture disc.

Further, the gear part is straight pipe-shaped, and the edges of the periphery of the PTC sheet and the periphery of the rupture disc are both abutted to the gear part.

Further, in the axial direction of the case main body, the gear portion protrudes from the outer edge of the rupture disk in a direction approaching the case main body.

Further, the gear portion is provided at an interval from the roller groove.

Further, the roller groove comprises a first ring piece and a second ring piece which are opposite and are arranged at intervals, the outer edge of the first ring piece is connected with the opening end of the shell main body, and the outer edge of the second ring piece is connected with one end of the connecting pipe;

the junction of second ring piece with the connecting pipe is the right angle form, on the axle cross-section of shell main part, connecting portion with insulating portion is the arc.

Further, the first ring piece and the second ring piece are both planar and parallel to each other;

the roll groove further includes a connecting wall connected between the inner edge of the first ring segment and the inner edge of the second ring segment.

Compared with the prior art, the utility model has the beneficial effects that: the cylindrical battery convenient to assemble comprises a cap assembly, a shell and an electric core, wherein the cap assembly and the shell form a closed space for accommodating other parts of the battery. The shell includes tubular shell main part, roller groove and connecting pipe, and shell main part, roller groove, connecting pipe connect gradually along the axial of shell, and the roller groove is the annular that encircles the shell setting, and the roller groove is concave for connecting pipe and shell main part all, and the electricity core is located the shell main part. The cap assembly comprises a top cover and a sealing ring, the top cover is in a cylinder shape with one end open, the connecting pipe is positioned in the top cover, the opening edge of the top cover is bent into the roller groove to form an annular connecting part, the sealing ring is positioned in the top cover and is formed by in-mold injection molding, the sealing ring comprises a sealing ring main body and an annular insulating part, one end of the sealing ring main body is connected with the insulating part, and the insulating part is close to the shell main body relative to the sealing ring main body; the sealing washer main part is connected between the lateral wall of connecting pipe and top cap, and insulating part compresses tightly between roller groove and connecting portion to keep apart connecting portion and roller groove. Because the sealing ring and the top cover are formed by in-mold injection, the sealing ring and the top cover form an integral part, are tightly connected and have strong tightness, the leakage phenomenon is not easy to occur, the process of assembling the sealing ring in the later process is reduced, the assembly efficiency is improved, and the assembly is convenient; when packaging, the opening border of top cap rolls up to the roller inslot and presses and form connecting portion, rolls up inwards for the one end that is close to the shell main part on the sealing washer and forms the insulating part, and connecting portion need not to be perpendicular with the lateral wall of top cap, and the insulating part need not to be perpendicular with the sealing washer main part, and the inner wall of roller groove and connecting portion hook the insulating part can realize the encapsulation of lid subassembly and shell, rolls up and presses the degree of difficulty low, and the assembly of being convenient for, the preparation is efficient, is favorable to satisfying market and customer's demand.

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 according to a preferred embodiment of the present utility model, which is convenient to assemble.

Fig. 2 is a cross-sectional view of the assembled cylindrical battery of fig. 1, relative to an end proximal to the cap assembly.

Fig. 3 is a schematic view of the cap assembly of the cylindrical battery of fig. 1 for easy assembly.

Fig. 4 is a schematic view of the top cover and gasket of the assembled cylindrical battery of fig. 1.

Fig. 5 is an exploded view of the cap assembly of the cylindrical battery of fig. 1 for ease of assembly

Fig. 6 is a cross-sectional view of the cap assembly of the cylindrical battery of fig. 1 for ease of assembly.

Fig. 7 is an exploded view of the assembled cylindrical battery of fig. 1.

Wherein, 1, the cap component, 2, the shell, 3, the electric core;

11. top cap, 12, sealing ring, 13, PTC sheet, 14, rupture sheet, 21, shell main body, 22, roller groove, 23, connecting pipe, 31, first tab, 32, second tab, 33, first insulating sheet, 34, second insulating sheet, 35, and open hole;

111. the connecting part, 112, the through hole, 113, the cover plate, 114, the top cover side wall, 115, the top cover bulge, 116, the exhaust hole, 121, the sealing ring main body, 122, the insulating part, 123, the bulge, 124, the limiting part, 125, the gear part, 126, the U-shaped groove, 141, the explosion wire, 221, the first ring piece, 222, the second ring piece, 223 and the connecting wall.

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, the preferred embodiment of the present utility model provides a cylindrical battery which is easy to assemble, comprising a cap assembly 1 and a housing 2, the cap assembly 1 and the housing 2 forming an enclosed space to accommodate other components of the battery.

Referring to fig. 2, the housing 2 includes a cylindrical housing main body 21, a roller groove 22, and a connecting pipe 23, wherein the housing main body 21, the roller groove 22, and the connecting pipe 23 are sequentially connected along an axial direction of the housing 2, the roller groove 22 is annular and is disposed around the housing 2, and the roller groove 22 is concave with respect to the connecting pipe 23 and the housing main body 21. As shown in fig. 4, 5 and 6, the cap assembly 1 comprises a top cover 11 and a sealing ring 12, the top cover 11 is in a cylindrical shape with one end open, the connecting pipe 23 is positioned in the top cover 11, the opening edge of the top cover 11 is bent into the roller groove 22 to form an annular connecting part 111, the sealing ring 12 is positioned in the top cover 11 and is formed by in-mold injection molding, the sealing ring 12 comprises a sealing ring main body 121 and an annular insulating part 122, one end of the sealing ring main body 121 is connected with the insulating part 122, and the insulating part 122 is close to the shell main body 21 relative to the sealing ring main body 121; the sealing ring body 121 is connected between the connection pipe 23 and the sidewall of the top cover 11, and the insulating part 122 is compressed between the roller groove 22 and the connection part 111, and separates the connection part 111 from the roller groove 22. Because the sealing ring 12 and the top cover 11 are formed by in-mold injection molding, the sealing ring 12 and the top cover 11 form an integral part, are tightly connected and have strong tightness, are not easy to leak liquid, reduce the process of assembling the sealing ring 12 in the later process, improve the assembly efficiency and facilitate the assembly; when packaging, the opening edge of the top cover 11 is rolled inwards towards the roller groove 22 to form the connecting part 111, the sealing ring 12 is rolled inwards towards one end close to the shell main body 21 to form the insulating part 122, the connecting part 111 does not need to be perpendicular to the side wall of the top cover 11, the insulating part 122 does not need to be perpendicular to the sealing ring main body 121, the insulating part 122 hooks the inner wall of the roller groove 22 and the connecting part 111 hooks the insulating part 122, the packaging of the cap assembly 1 and the shell 2 can be realized, the rolling difficulty is low, the assembly is convenient, the manufacturing efficiency is high, and the requirements of markets and customers are favorably met.

The top cover 11 is provided with a through hole 112, and the seal ring 12 is provided with a protrusion 123 filled into the through hole 112. When top cap 11 and sealing washer 12 injection moulding, the injection molding liquid flows into and forms protruding 123 in the through-hole 112, and the preparation of being convenient for, and protruding 123 and sealing washer 12 structure as an organic whole, structural strength is high, protruding 123 and through-hole 112 joint, further promotes the connection compactness of top cap 11 and sealing washer 12.

In this embodiment, the top cover 11 and the housing 2 are made of stainless steel, which is sturdy and durable.

In other embodiments, the top cover or the housing may be made of other hardware materials, such as copper alloy, to save cost.

The top cover 11 comprises a cover plate 113 and a tubular top cover side wall 114, wherein the cover plate 113 is connected to one end of the top cover side wall 114, the other end of the top cover side wall 114 is bent to form a connecting part 111, and at least one of the peripheral edge of the cover plate 113 and the top cover side wall 114 is provided with a through hole 112; protrusions 123 are provided in all the through holes 112. In this embodiment, through holes 112 are formed on the peripheral edge of the cover plate 113 and the side wall 114 of the top cover, and the peripheral edge of the cover plate 113 and the side wall of the top cover 11 are connected with the sealing ring 12 through the cooperation of the protrusions 123 and the through holes 112, so as to further enhance the connection tightness between the top cover 11 and the sealing ring 12.

In other embodiments, through holes are formed only on the peripheral edges of the cover plate, and protrusions are arranged in the through holes, so that the cover plate is convenient to manufacture; or, only set up the through-hole on the top cap lateral wall, be provided with the arch in the through-hole, be convenient for make.

In the present embodiment, the cover plate 113 forms a top cover projection 115 in a direction away from the case main body 21 to connect the positive terminal of the external circuit.

Referring to fig. 3, the top cap protrusion 115 is provided with a vent hole 116, and when the internal air pressure of the battery increases, the vent hole 116 discharges air, thereby preventing the battery from safety accidents.

The vent 116 is square, which is convenient for manufacturing.

The exhaust holes 116 are arranged in three, and the three exhaust holes 116 encircle the axial direction of the top cover 11, so that gas can be exhausted more quickly.

In other embodiments, the exhaust hole can be round, square, elliptic or star-shaped, thereby increasing the interestingness and improving the use feeling.

The exhaust holes can be arranged below two, so that the manufacture is convenient, or the exhaust holes can be arranged above four, and a plurality of exhaust holes encircle the axial direction of the top cover, so that the exhaust efficiency of gas is further improved.

In other embodiments, the cover plate may not be provided with a top cover protrusion, the sealing end of the top cover is planar, the size of the battery is shortened in the axial direction of the housing main body, and the space of the electric equipment occupied by the battery is smaller, so that the electric equipment is convenient to use.

Referring to fig. 2, the sealing ring 12 further includes an annular limiting portion 124, the limiting portion 124 and the insulating portion 122 are respectively located at two ends of the sealing ring main body 121, the limiting portion 124 is far away from the housing main body 21 relative to the insulating portion 122, the limiting portion 124 is attached to an outer edge of the cover plate 113 and clamped between the cover plate 113 and the connecting tube 23, when the cap assembly 1 and the housing 2 are assembled, the end portion of the connecting tube 23 is prevented from being in direct contact with the cover plate 113, and the material of the limiting portion 124 is relatively soft, so that the end portion of the connecting tube 23 can be prevented from being deformed. The stopper 124 is clamped between the cover plate 113 and the connection pipe 23, and can seal the battery to prevent the liquid in the battery from being exposed from the connection pipe 23.

In this embodiment, the outer peripheral surface of the seal ring main body 121 and the outer edge of the limiting portion 124 are both provided with protrusions 123, the protrusions 123 are disposed in the through holes 112 in a penetrating manner, and in the axial direction and the radial direction of the seal ring main body 121, the seal ring 12 and the top cover 11 are both tightly connected, so that the tightness is improved.

Referring to fig. 4, in the present embodiment, six through holes 112 are provided on the cover plate 113, six through holes 112 are provided on the top cover side wall 114, all through holes 112 encircle the axial direction of the top cover 11, six protrusions 123 are provided on the seal ring main body 121, six protrusions 123 are provided on the limiting portion 124, all protrusions 123 encircle the axial direction of the seal ring main body 121, the through holes 112 on the cover plate 113 correspond to the protrusions 123 on the limiting portion 124 one by one, the through holes 112 on the top cover side wall 114 correspond to the protrusions 123 on the seal ring main body 121 one by one, and the connection tightness between the seal ring 12 and the top cover 11 is further improved.

In other embodiments, the through holes on the side wall of the cover plate or the top cover can be less than five, and the protrusions on the sealing ring main body or the limiting part can be less than five, so that the manufacturing is convenient; or, can also set up the through-hole on cover plate or the top cap lateral wall to seven more, set up the arch on sealing washer main part or the spacing portion to seven more, promote the connection compactness of sealing washer and top cap.

In this embodiment, all the through holes 112 and the protrusions 123 are columnar, and the cross sections of the through holes and the protrusions are circular, so that the manufacturing is facilitated.

In other embodiments, the through holes and the protrusions can be columnar, the cross section of the through holes and the protrusions is square, elliptic or star-shaped, the protrusions are exposed, different patterns can be formed on the surface of the cover plate and the surface of the side wall of the top cover, the through holes and the protrusions can be used as characteristic marks of products, meanwhile, the interestingness can be increased, and the use feeling is improved.

Referring to fig. 2, the sealing ring 12 further includes a tubular gear portion 125, one end of the gear portion 125 is connected to an inner edge of the limiting portion 124, the limiting portion 124 is far away from the housing main body 21 relative to the gear portion 125, and the connecting tube 23 is clamped between the sealing ring main body 121 and the gear portion 125. Referring to fig. 6, the gear portion 125, the limiting portion 124 and the side wall of the seal ring main body 121 form a U-shaped groove 126, and when the cap assembly 1 and the housing 2 are assembled, the connecting tube 23 is inserted into the U-shaped groove 126 and is in interference fit with the U-shaped groove 126, so that the cap assembly 1 can be fixed with the housing 2, thereby facilitating subsequent crimping and facilitating manufacturing.

In this embodiment, the sealing ring is preferably made of any one of plastic materials such as PP (polypropylene), PI (polyimide) or PS (polystyrene), and the sealing ring melting point is preferably 100 to 500 ℃.

Referring to fig. 5 and 6, the cap assembly 1 further includes a PTC sheet 13 and a rupture sheet 14, both of which are positioned in the gear portion 125, and the PTC sheet 13 is connected between the cover sheet 113 and the rupture sheet 14. When the internal temperature of the battery increases, the PTC sheet 13 can greatly increase the resistance of the battery to interrupt the current, preventing the battery from safety accidents.

In this embodiment, the rupture disk 14 is of a conductive film structure, and the rupture disk 14 is recessed toward the direction close to the housing main body 21, so that the rupture disk 14 is connected with the components inside the housing main body 21, so as to convey the electric quantity to the electric equipment. Referring to fig. 6, a ring of explosion-proof lines is formed in the recess of the rupture disk 14, and when the internal pressure of the battery exceeds a predetermined level, the pressure is pressed against the explosion lines 141 to accelerate the disconnection of the explosion lines 141, thereby realizing rapid gas discharge, reducing the air pressure in the battery, and preventing the battery from safety accidents.

In other embodiments, the burst wire may be provided in more than two turns, and when the internal pressure of the battery exceeds a predetermined level, the burst wire is disconnected for multiple turns, so that the gas can be discharged from the inside of the battery more quickly, and the use is safer.

The gear portion 125 is in a straight tube shape, so that the PTC sheet 13 and the rupture disc 14 are conveniently placed in the gear portion 125, the PTC sheet 13 is welded with the cover plate 113, the rupture disc 14 is welded with the PTC sheet 13, and the top cover 11, the PTC sheet 13 and the rupture disc 14 are tightly connected. Both edges all around PTC piece 13 and rupture disk 14 butt in fender position portion 125, and fender position portion 125 can be spacing PTC piece 13 and rupture disk 14, and PTC piece 13 and rupture disk 14 of being convenient for are accurate to be packed into to guarantee subsequent welding in place.

The PTC sheet 13 and the rupture sheet 14 are hermetically connected to the connection pipe 23 by the stopper 125, thereby improving the sealing property.

In the axial direction of the housing main body 21, the gear portion 125 protrudes from the outer edge of the rupture disk 14 in the direction approaching the housing main body 21, so that the rupture disk 14 is prevented from contacting the connecting pipe 23 and the roller groove 22, the rupture disk 14 is insulated from the connecting pipe 23, and the battery is insulated in polarity.

The gear portion 125 is spaced from the roller groove 22 to prevent the rupture disk 14 from contacting the roller groove 22, so that the rupture disk 14 is insulated from the roller groove 22 and the battery is polarity-insulated.

The roller groove 22 comprises a first ring piece 221 and a second ring piece 222 which are opposite and arranged at intervals, wherein the outer edge of the first ring piece 221 is connected with the opening end of the shell main body 21, and the outer edge of the second ring piece 222 is connected with one end of the connecting pipe 23; the connection between the second ring piece 222 and the connecting pipe 23 is in a rounded shape, the connection of the rounded shape is convenient for forming, and the insulating part 122 and the connecting part 111 are convenient for attaching to each other, so that the tightness is improved. On the axial section of the housing main body 21, the connecting portion 111 and the insulating portion 122 are both arc-shaped, and the connecting portion 111 and the insulating portion 122 are both formed by crimping, so that the arc-shaped connecting portion 111 and insulating portion 122 are easy to manufacture.

The first ring piece 221 and the second ring piece 222 are planar and parallel to each other; the roller groove 22 further includes a connecting wall 223, the connecting wall 223 is connected between the inner edge of the first ring piece 221 and the inner edge of the second ring piece 222, on the axial section of the housing main body 21, the roller groove 22 is U-shaped, the second ring piece 222 and the opening end face of the housing main body 21 are parallel to each other, and the roller groove 22 plays a limiting role on the opening edge of the housing main body 21.

In other embodiments, the connecting wall is not required, the first ring piece and the second ring piece are conical surfaces and are connected with each other in an included angle, the whole roller groove is in a V shape on the axial section of the shell main body, and materials used for the roller groove are reduced, so that the cost is saved.

Or, do not set up the linking wall, first ring piece and second ring piece are cambered surface form, on the axle cross section of shell main part, the roller groove is whole to be the arc, the preparation of being convenient for.

The assembled cylindrical battery further comprises an electric core 3, wherein the electric core 3 is positioned in the shell main body 21 and is used for storing electric energy. The battery core 3 is of a winding type or laminated type, and the electric welding of the winding type battery core 3 is easy and convenient for production control; the laminated cell 3 has high energy density, flexible volume and convenient assembly.

Referring to fig. 7, the battery cell 3 is provided with a first tab 31 and a second tab 32 for transmitting electric energy of the battery cell 3. The first tab 31 is welded to the recess of the rupture disk 14, and the second tab 32 is welded to the sealed end of the casing body 21, by means of spot bottom resistance welding, double needle resistance welding, or laser welding.

The both ends of electric core 3 are provided with first insulating piece 33 and second insulating piece 34 respectively, and one of them one end of electric core 3 is connected with roller groove 22 through first insulating piece 33, and the other end is connected with the sealed end of shell main part 21 through second insulating piece 34, and electric core 3 does not directly contact with shell 2, and the battery forms polarity insulation.

The first insulating sheet 33 and the second insulating sheet 34 are respectively provided with an opening 35, the first tab 31 penetrates through the opening 35 on the first insulating sheet 33 to be connected with the rupture disk 14, and the second tab 32 penetrates through the opening 35 on the second insulating sheet 34 to be connected with the sealing end of the shell main body 21. The first insulating sheet 33 and the second insulating sheet 34 are preferably made of any plastic material such as PP (polypropylene), PI (polyimide), or PS (polystyrene).

When the battery is assembled, the cap 11 can be molded into an integral part of the cap 11 and the seal ring 12, then the PTC sheet 13 and the rupture sheet 14 are placed into the integral part, and welded, thereby forming the cap assembly 1. The top cover 11 and the sealing ring 12 are integrally formed, so that the tightness of the battery is enhanced, the process of assembling the sealing ring 12 in the later process is reduced, and the assembly efficiency is improved.

The battery cell 3 is arranged in the shell 2, a roller groove 22 and a connecting pipe 23 are formed through a shell post-process, the roller groove 22 can limit the battery cell 3 and prevent the battery cell 3 from moving, a groove with a U-shaped or V-shaped section is formed in the roller groove 22, the roller groove 22 comprises a first ring piece 221 and a second ring piece 222, and the connecting part of the second ring piece 222 and the connecting pipe 23 is in a round corner structure; the connecting pipe 23 is arranged in the cap assembly 1, the connecting pipe 23 and the U-shaped groove 126 form a limit structure, the shell 2 is not in direct contact with the top cover 11, and the battery forms polarity insulation; then, the electrolyte is dripped into the shell main body 21, and finally, the insulating part 122 and the connecting part 111 are formed in a rolling and pressing mode, the insulating part 122 is buckled at the joint of the second annular sheet 222 and the connecting pipe 23, the connecting part 111 is buckled on the insulating part 122 and is in interference fit with the insulating part 122, so that a buckling structure which can be sealed and insulated is obtained, and the cap assembly 1 cannot fall off from the shell 2.

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 convenient to assembly, its characterized in that: comprises a cap assembly, a shell and a battery cell;

the shell comprises a cylindrical shell main body, a roller groove and a connecting pipe, wherein the shell main body, the roller groove and the connecting pipe are sequentially connected along the axial direction of the shell; the roller groove is annular and is arranged around the shell, the roller groove is concave relative to the connecting pipe and the shell main body, and the battery cell is positioned in the shell main body;

the cap assembly comprises a top cover and a sealing ring, wherein the top cover is cylindrical, one end of the top cover is open, the connecting pipe is positioned in the top cover, and the opening edge of the top cover is bent into the roller groove to form an annular connecting part; the sealing ring is positioned in the top cover, and the sealing ring and the top cover are integrally formed by in-mold injection molding; the sealing ring comprises a sealing ring main body and an annular insulating part, one end of the sealing ring main body is connected with the insulating part, and the insulating part is close to the shell main body relative to the sealing ring main body; the sealing ring main body is connected between the connecting pipe and the side wall of the top cover, and the insulating part is pressed between the roller groove and the connecting part and isolates the connecting part from the roller groove.

2. The assembled cylindrical battery of claim 1, wherein: the top cover is provided with a through hole, and the sealing ring is provided with a bulge filled into the through hole.

3. The assembled cylindrical battery of claim 2, wherein: the top cover comprises a cover plate and a tubular top cover side wall, the cover plate is connected to one end of the top cover side wall, the other end of the top cover side wall is bent to form the connecting part, and at least one of the peripheral edge of the cover plate and the top cover side wall is provided with the through hole; the protrusions are arranged in all the through holes;

the sealing ring further comprises annular limiting parts, the limiting parts and the insulating parts are respectively located at two ends of the sealing ring main body, the limiting parts are far away from the shell main body relative to the insulating parts, and the limiting parts are attached to the outer edges of the cover plates and clamped between the cover plates and the connecting pipes.

4. A cylindrical battery for easy assembly according to claim 3, wherein: the sealing ring further comprises a tubular gear part, one end of the gear part is connected with the inner edge of the limiting part, the limiting part is far away from the shell main body relative to the gear part, and the connecting pipe is clamped between the sealing ring main body and the gear part.

5. The assembled, cylindrical battery of claim 4, wherein: the cap assembly further includes a PTC sheet and a rupture disc, both positioned within the gear portion, the PTC sheet being connected between the cover sheet and the rupture disc.

6. The assembled cylindrical battery of claim 5, wherein: the gear part is in a straight pipe shape, and the peripheral edges of the PTC sheet and the rupture disc are both abutted to the gear part.

7. The assembled cylindrical battery of claim 5, wherein: in the axial direction of the shell main body, the gear part protrudes out of the outer edge of the rupture disk towards the direction approaching the shell main body.

8. The assembled cylindrical battery of claim 5, wherein: the gear part is arranged at intervals with the roller groove.

9. The assembled cylindrical battery of claim 1, wherein: the roller groove comprises a first annular sheet and a second annular sheet which are opposite and are arranged at intervals, the outer edge of the first annular sheet is connected with the opening end of the shell main body, and the outer edge of the second annular sheet is connected with one end of the connecting pipe;

the junction of second ring piece with the connecting pipe is the right angle form, on the axle cross-section of shell main part, connecting portion with insulating portion is the arc.

10. The assembled, cylindrical battery of claim 9, wherein: the first ring piece and the second ring piece are both planar and are parallel to each other;

the roll groove further includes a connecting wall connected between the inner edge of the first ring segment and the inner edge of the second ring segment.