CN217158359U

CN217158359U - Cylindrical battery shell and cylindrical battery

Info

Publication number: CN217158359U
Application number: CN202220557493.9U
Authority: CN
Inventors: 张雷; 赵赫; 黄利明; 徐悦斌; 何巍
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-08-09
Anticipated expiration: 2032-03-15

Abstract

The utility model relates to the technical field of batteries, especially, relate to a cylinder battery case and cylinder battery. The cylindrical battery shell comprises a shell body and a cover plate, wherein the upper end of the shell body is provided with an opening, and the outer edge of the opening end of the shell body extends outwards to form a first folded edge. The outer edge of the cover plate is provided with a second folding edge, the cover plate is plugged at the opening end of the shell, and the first folding edge and the second folding edge are overlapped and then turned inwards to form a rolling part. The cylindrical battery comprises the cylindrical battery shell and the winding core. The first folded edge of the shell and the second folded edge of the cover plate are overlapped and then are turned inwards to form a turning part, so that a labyrinth sealing structure is formed inside the turning part, and the shell and the cover plate are well sealed. Adopt the mode of bending between casing and the apron, reduced cylindrical battery shell's the processing degree of difficulty, improved machining efficiency, can avoid impurity such as dust to get into in the casing in the welding process moreover, improved cylindrical battery's security.

Description

Cylindrical battery shell and cylindrical battery

Technical Field

The utility model relates to a battery technology field especially relates to a cylinder battery case and cylinder battery.

Background

The electric core of the cylindrical lithium ion battery is generally prepared by adopting a winding mode, and has certain advantages in the manufacturing process. Generally, a cylindrical lithium ion battery is composed of a cylindrical case and an internal cell unit.

Currently, the outer case of the aluminum cylindrical battery includes a case body and a cover plate, and when the case body is sealed with the cover plate, the cover plate is usually fixed to the open end of the case body and then laser welded. The laser welding has low processing efficiency and high cost. And inside dust got into the casing easily in welding process, lead to the potential safety hazards such as battery short circuit to appear.

Therefore, a cylindrical battery case and a cylindrical battery are required to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cylinder battery case and cylinder battery to reduce cylinder battery case's the processing degree of difficulty, improve machining efficiency and security, improve the leakproofness of shell simultaneously.

To achieve the purpose, the technical proposal adopted by the utility model is that:

a cylindrical battery housing comprising:

the upper end of the shell is provided with an opening, and the outer edge of the opening end of the shell extends outwards to form a first folded edge; and

the outer edge of the cover plate is provided with a second folded edge, the cover plate is plugged at the opening end of the shell, and the first folded edge and the second folded edge are overlapped and then are inwards turned to form a turning part.

As an alternative of the cylindrical battery shell, the rolling portion includes a first rolling structure and a second rolling structure, the first rolling structure is formed after the first rolling is turned over, the second rolling structure is formed after the second rolling is turned over, a tail end of the first rolling structure is clamped in the second rolling structure, and a tail end of the second rolling structure is clamped in the first rolling structure and attached to the outer peripheral surface of the shell.

As an alternative of the cylindrical battery case, the inner side surface of the second folded edge is coated with a sealant, so that a sealant layer is formed between the first folded edge structure and the second folded edge structure.

As an alternative to the cylindrical battery case, the cover plate includes a main body portion and a guide portion, an outer edge of the main body portion extends obliquely upward to form the guide portion, and an outer edge of the guide portion extends outward to form the second folded edge.

As an alternative to the cylindrical battery case, a transition groove is provided between the main body part and the guide part.

As an alternative to the cylindrical battery case, a portion of the case body near the open end is shrunk inward to form a constricted portion to form a relief portion at the outer periphery of the case body, and the rolled portion is located in the relief portion.

As an alternative to the cylindrical battery case, the throat may be a tapered mouth having an inner diameter gradually decreasing toward the inside of the case, and the side surface of the guide portion may be fitted to an inner surface of the throat.

As an alternative to the cylindrical battery case, the main body portion, the guide portion, and the second flange may be integrally formed by bending.

As an alternative to the cylindrical battery case, a through hole is formed in a center position of the main body portion, and the positive electrode post of the cylindrical battery can be passed through the through hole.

A cylindrical battery comprises the cylindrical battery shell.

The utility model has the advantages that:

the utility model provides a cylinder battery case, the first hem of casing forms the turn-up portion with interior upset after the second hem coincide of apron for the inside seal structure who forms the labyrinth of turn-up portion has realized the good of casing and apron. For current laser welding scheme, adopt the mode of bending between the casing of this application and the apron, reduced cylindrical battery case's the processing degree of difficulty, improved machining efficiency, can avoid impurity such as dust to get into in the casing in the welding process moreover, improved cylindrical battery's security.

The utility model provides a cylinder battery is through adopting foretell cylinder battery case, and the first hem of casing forms the turn-up portion with interior upset after the second hem coincide of apron for form labyrinth's seal structure in the turn-up portion, realized the good sealed of casing and apron. For current laser welding scheme, adopt the mode of bending between the casing of this application and the apron, reduced cylindrical battery case's the processing degree of difficulty, improved machining efficiency, can avoid impurity such as dust to get into in the casing in the welding process moreover, improved cylindrical battery's security.

Drawings

Fig. 1 is a cross-sectional view of a cylindrical battery case according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic view of an assembly structure of the housing and the cover plate according to an embodiment of the present invention;

fig. 4 is a partially enlarged view at B in fig. 3.

The component names and designations in the drawings are as follows:

10. a roll-over portion; 101. a first crimping structure; 102. a second crimping structure;

1. a housing; 11. a first folded edge; 12. necking; 120. an avoidance part;

2. a cover plate; 21. a main body portion; 211. a through hole; 22. a guide portion; 23. a second folded edge; 231. a horizontal segment; 232. a vertical section; 24. a transition groove.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The conventional aluminum-shell cylindrical battery has a case and a cover plate, and when the case and the cover plate are sealed, the cover plate is fixed to an open end of the case and then laser-welded. The laser welding has low processing efficiency and high cost. And inside dust got into the casing easily in welding process, lead to the potential safety hazards such as battery short circuit to appear.

In order to solve the above problems, as shown in fig. 1 to 4, the present embodiment discloses a cylindrical battery case including a case body 1 and a cover plate 2, wherein the upper end of the case body 1 is open, and a first folded edge 11 extends outward from the outer edge of the open end of the case body 1. The outer edge of the cover plate 2 is provided with a second folded edge 23, the cover plate 2 is plugged at the opening end of the shell 1, and the first folded edge 11 and the second folded edge 23 are overlapped and then are turned inwards to form a rolled part 10.

In the present embodiment, the inside of the rolled portion 10 forms a labyrinth seal structure, and good sealing of the housing 1 and the cover plate 2 is achieved. For current laser welding scheme, adopt the mode of bending between the casing 1 of this embodiment and the apron 2, reduced cylindrical battery case's the processing degree of difficulty, improved machining efficiency, can avoid impurity such as dust to get into in the casing 1 in the welding process moreover, improved cylindrical battery's security. In addition, the integral structure of the shell 1 and the cover plate 2 is simple and easy to process.

As shown in fig. 2, the turning part 10 includes a first turning structure 101 and a second turning structure 102, the first turning 11 is turned to form the first turning structure 101, the second turning 23 is turned to form the second turning structure 102, a terminal section of the first turning structure 101 is sandwiched in the second turning structure 102, and a terminal section of the second turning structure 102 is sandwiched in the first turning structure 101 and attached to the outer peripheral surface of the housing 1. By hooking the first crimping structure 101 and the second crimping structure 102 to each other, the sealing performance between the housing 1 and the cover plate 2 is improved. Meanwhile, the end of the second curling structure 102 is attached to the outer peripheral surface of the housing 1, which not only can further improve the sealing performance of the curling portion 10, but also can make the curling portion 10 more compactly formed at the opening end of the housing 1, thereby reducing the size of the curling portion 10 along the radial direction of the housing 1.

It should be noted that the inner side of the second folded edge 23 is coated with a sealant, so that a sealant layer is formed between the first folded edge structure 101 and the second folded edge structure 102. The gap between the first hemming structure 101 and the second hemming structure 102 is filled with the sealant, and the sealability of the hemming portion 10 is further improved.

As shown in fig. 3 and 4, the cover plate 2 includes a main body 21 and a guide portion 22, and the main body 21, the guide portion 22 and the second folded edge 23 are integrally formed by bending, so that the processing method is simple, the efficiency is high, and the cost of the cover plate 2 is reduced. Before the cover plate 2 is bent, the main body 21 of the cover plate 2 is substantially in a disc structure, the outer edge of the main body 21 extends upwards in an inclined manner to form a guide portion 22, the outer edge of the guide portion 22 extends outwards to form a second folded edge 23, the guide portion 22 and the second folded edge 23 enclose a U-shaped groove, and the first folded edge 11 can abut against the bottom wall of the U-shaped groove. This guide part 22 forms the direction flaring, makes things convenient for apron 2 to insert the open end of casing 1 fast, has improved the packaging efficiency of apron 2 with casing 1.

Specifically, the second folded edge 23 includes a horizontal section 231 and a vertical section 232, and both ends of the horizontal section 231 are connected to the guide 22 and the vertical section 232, respectively. Before the housing 1 is bent, the first folded edge 11 is in a straight shape, and the first folded edge 11 is attached to the inner side of the horizontal section 231.

The specific bending process of the cover plate 2 and the shell 1 is as follows: when the cover 2 is mounted to the open end of the housing 1, the first flange 11 and the horizontal section 231 of the second flange 23 are attached together. The vertical section 232 of the second folded edge 23 is then folded towards the inside by 90 ° parallel to the horizontal section 231. At this time, the second flange 23 is sandwiched between the horizontal section 231 and the vertical section 232, and together forms an intermediate body of the turning part 10. Finally, the intermediate body is turned by 90 ° further toward the inside to form the turned portion 10, and at this time, the vertical section 232 (the end section of the second crimping structure 102) is attached to the outer peripheral surface of the housing 1. It should be noted that, a gap is formed between the end of the first folded edge 11 and the vertical section 232, so as to avoid interference between the first folded edge 11 and the second folded edge 23 when the rolled portion 10 is formed, and ensure smooth bending of the rolled portion 10.

In the present embodiment, the transition groove 24 is provided between the main body portion 21 and the guide portion 22, which can further improve the structural strength of the cover plate 2. Meanwhile, the transition groove 24 has good elasticity, so that excessive stretching between the main body part 21 and the guide part 22 in the bending process of the first folded edge 11 is avoided, and the structural stability of the cover plate 2 is improved.

Note that a through hole 211 is formed in the center of the main body 21 of the lid plate 2, and the radial dimension of the through hole 211 is adapted to the outer diameter of the positive pole of the winding core in the cylindrical battery so that the positive pole of the winding core passes through the through hole 211 in the lid plate 2.

As shown in fig. 4, a portion of the housing 1 near the open end is shrunk inwardly to form a reduced opening 12 to form a relief portion 120 at the outer periphery of the housing 1, and the rolled-up portion 10 is located in the relief portion 120. The structural strength of the housing 1 can be improved by the reduced opening 12, and the relief portion 120 formed on the outer periphery of the housing 1 by the reduced opening 12 can accommodate the rolled portion 10, thereby avoiding the increase of the radial dimension of the housing 1 after the rolled portion 10 is formed.

Specifically, the throat 12 is a tapered mouth having an inner diameter gradually decreasing toward the inside of the housing 1, and the side surface of the guide portion 22 can be fitted to the inner surface of the throat 12. When the cover plate 2 is installed at the opening end of the shell 1, the guide part 22 is in clamping fit with the necking part 12, so that the cover plate 2 is prevented from rotating relative to the shell 1, and the smooth bending of the rolling part 10 is facilitated.

The embodiment also discloses a cylindrical battery, and the cylindrical battery comprises the cylindrical battery shell and the winding core. The winding core is installed in the cylindrical battery shell, and the positive pole of the winding core can penetrate out of the through hole 211 of the cover plate 2. The cylindrical battery achieves good sealing between the case 1 and the cap plate 2 by the rolled portion 10 on the case. Meanwhile, the shell is formed between the shell 1 and the cover plate 2 in a bending mode, the processing difficulty of the cylindrical battery shell is reduced, the processing efficiency is improved, impurities such as dust in the welding process can be prevented from entering the shell 1, and the safety of the cylindrical battery is improved.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A cylindrical battery case, comprising:

the shell (1), the upper end of the shell (1) is open, and the outer edge of the open end of the shell (1) extends outwards to form a first folded edge (11); and

the outer edge of the cover plate (2) is provided with a second folding edge (23), the cover plate (2) is arranged at the opening end of the shell (1) in a sealing mode, and the first folding edge (11) and the second folding edge (23) are folded and then are turned inwards to form a rolling part (10).

2. The cylindrical battery shell according to claim 1, wherein the rolled portion (10) comprises a first rolled structure (101) and a second rolled structure (102), the first folded edge (11) is rolled to form the first rolled structure (101), the second folded edge (23) is rolled to form the second rolled structure (102), an end section of the first rolled structure (101) is clamped in the second rolled structure (102), and an end section of the second rolled structure (102) is clamped in the first rolled structure (101) and is attached to the outer peripheral surface of the shell (1).

3. The cylindrical battery case according to claim 2, wherein the inner side of the second folded edge (23) is coated with a sealant, so that a sealant layer is formed between the first folded edge structure (101) and the second folded edge structure (102).

4. The cylindrical battery case according to claim 1, wherein the cover plate (2) comprises a main body part (21) and a guide part (22), the guide part (22) extends obliquely upward from the outer edge of the main body part (21), and the second folded edge (23) extends outward from the outer edge of the guide part (22).

5. The cylindrical battery case according to claim 4, characterized in that there is a transition groove (24) between the main body portion (21) and the guide portion (22).

6. The cylindrical battery case according to claim 4, wherein a portion of the case body (1) near the open end is shrunk inwards to form a reduced opening (12) to form a relief portion (120) at the outer periphery of the case body (1), and the rolled portion (10) is located in the relief portion (120).

7. Cylindrical battery casing according to claim 6, characterised in that the constriction (12) is a conical mouth with a decreasing inner diameter towards the inside of the housing (1), the sides of the guide (22) being able to cooperate with the inner surface of the constriction (12).

8. The cylindrical battery case according to claim 4, wherein the main body portion (21), the guide portion (22), and the second folded edge (23) are integrally formed by bending.

9. The cylindrical battery case according to claim 4, wherein a through hole (211) is formed in a central position of the main body portion (21), and a positive pole of the cylindrical battery can be passed through the through hole (211).

10. A cylindrical battery comprising the cylindrical battery case according to any one of claims 1 to 9.