CN215731936U

CN215731936U - Columnar lithium battery

Info

Publication number: CN215731936U
Application number: CN202121819534.9U
Authority: CN
Inventors: 朱乐; 李吉栋; 李跃飞; 徐悦斌; 何巍
Original assignee: Ningbo Eve Chuang Energy Lithium Battery Co ltd
Current assignee: Ningbo Eve Chuang Energy Lithium Battery Co ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-02-01
Anticipated expiration: 2031-08-05

Abstract

The utility model relates to the technical field of batteries, in particular to a columnar lithium battery which comprises a shell, a cover plate and a sealing ring. Wherein, the one end of shell is the opening, and the shell is close to circumference on the open-ended lateral wall and is provided with protruding waist, and protruding waist is including keeping away from open-ended first slope. The apron lid is established at the opening part, and the lateral wall of apron includes that circumference sets up the interior portion of sealing to the axis slope, interior portion of sealing and first slope portion butt sealing cooperation. The sealing ring is arranged between the shell and the cover plate. Through the sealed cooperation of the interior portion of sealing of apron and the first rake butt of protruding waist, can realize sealed, sealed effect can further be guaranteed to the sealed setting of rethread sealing ring between shell and apron, avoids electrolyte to take place to leak. And the processing of the convex waist can not lead to the cladding material of the shell to drop, and can avoid the risk of liquid leakage and rusting.

Description

Columnar lithium battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a columnar lithium battery.

Background

The columnar lithium battery has wide application range and can provide power for various small electronic devices. The electrolyte of the columnar lithium battery is sealed in the steel shell, poor sealing of the electrolyte can directly cause reduction of the cycle life of the battery core, and the performance of the battery is abnormal.

The existing columnar lithium battery is manufactured by performing groove rolling on a steel shell to form a circumferential inner concave part, then a terminal assembly is arranged in the steel shell and is lapped on the circumferential inner concave part of the steel shell, and the steel shell is sealed and processed. When the steel shell is subjected to rolling groove processing, the steel shell coating at the rolling groove position is easy to fall off, and liquid leakage and rusting risks are formed.

Therefore, a lithium battery having a pillar shape is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a columnar lithium battery, which can avoid the risks of electrolyte leakage and shell rusting and ensure the quality of the battery.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a lithium cylindrical battery comprising:

the shell is provided with an opening at one end, and a convex waist is circumferentially arranged on the side wall, close to the opening, of the shell and comprises a first inclined part far away from the opening;

the cover plate is covered at the opening, the side wall of the cover plate comprises an inner sealing part which is arranged in the circumferential direction and inclined towards the axis, and the inner sealing part is abutted and matched with the first inclined part in a sealing manner;

and the sealing ring is arranged between the shell and the cover plate.

Optionally, the seal ring includes a first sealing portion circumferentially disposed between the inner sealing portion and the first inclined portion.

Optionally, the waist further includes a convex portion, the side wall of the cover plate further includes a side seal portion arranged circumferentially, and the convex portion is in sealing fit with the side seal portion.

Optionally, the seal ring further comprises a second sealing portion circumferentially disposed between the boss and the side seal portion.

Optionally, the end of the housing provided with the opening is in sealing engagement with the top surface of the cover plate.

Optionally, the sealing ring further comprises a third sealing portion disposed between the end of the opening and the top surface of the cover plate.

Optionally, the seal ring further comprises a fourth sealing portion disposed at an inner wall of the housing.

Optionally, the inner seal is disposed at an end of the side wall of the cover plate away from the top surface of the cover plate.

Optionally, the first sealing portion, the second sealing portion, the third sealing portion and the fourth sealing portion are of an integrally formed structure.

Optionally, the battery further comprises a battery cell and an insulating gasket, the battery cell is disposed in the housing, and the insulating gasket is disposed between the battery cell and the cover plate.

The utility model has the beneficial effects that:

the utility model provides a columnar lithium battery which comprises a shell, a cover plate and a sealing ring. Wherein, the one end of shell is the opening, and the shell is close to circumference on the open-ended lateral wall and is provided with protruding waist, and protruding waist is including keeping away from open-ended first slope. The apron lid is established at the opening part, and the lateral wall of apron includes that circumference sets up the interior portion of sealing to the axis slope, interior portion of sealing and first slope portion butt sealing cooperation. The sealing ring is arranged between the shell and the cover plate. Through the sealed cooperation of the interior portion of sealing of apron and the first rake butt of the protruding waist of shell, can realize sealed, sealed effect can further be guaranteed to the setting of rethread sealing washer between shell and apron, avoids electrolyte to take place to leak. Compare in the interior recess of slot rolling processing circumference on the shell among the prior art, the shell of this column lithium cell sets up protruding waist, can improve the intensity of shell greatly, and the processing of protruding waist can not lead to the cladding material of shell to drop, just can effectively avoid the weeping and the rusty risk of the interior recess department of circumference of slot rolling processing.

Drawings

Fig. 1 is a schematic structural diagram of a lithium pillar battery provided in an embodiment of the present invention.

In the figure:

1. a housing; 11. a waist is raised; 111. a first inclined portion; 112. a convex portion; 113. a second inclined portion;

2. a cover plate; 21. an inner seal portion; 22. a side seal part;

3. a seal ring; 31. a first seal portion; 32. a second seal portion; 33. a third seal portion; 34. and a fourth seal portion.

4. And an insulating gasket.

Detailed Description

The technical scheme of the utility model is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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 order to avoid the above risk, the present embodiment provides a pillar-shaped lithium battery as shown in fig. 1 to solve the above problem. Specifically, the cylindrical lithium battery includes a case 1, a cap plate 2, and a sealing ring 3.

Wherein, one end of the outer shell 1 is an opening, a waist 11 is circumferentially arranged on the side wall of the outer shell 1 close to the opening, the waist 11 comprises a first inclined part 111 far away from the opening and a second inclined part 113 close to the opening, and the waist 11 further comprises a convex part 112 connecting the first inclined part 111 and the second inclined part 113. It can be known that the bulge 11 has strong resistance to the external applied pressure, which is not only beneficial to protecting the safety of the battery core, but also convenient for the subsequent sealing processing. Optionally, the housing 1 is a steel shell.

The cover plate 2 covers the opening, the cover plate 2 comprises a top surface and a side wall, the top surface is connected with the side wall, and the side wall comprises an inner sealing part 21 which is circumferentially arranged and inclines towards the axis direction and a side sealing part 22 which is circumferentially arranged. Alternatively, the inner seal 21 is disposed at an end of the side wall of the cover plate 2 away from the top surface of the cover plate 2, which can further simplify the process of the cover plate 2.

In order to ensure the sealing between the housing 1 and the cover plate 2, there are a plurality of sealing structures between the housing 1 and the cover plate 2. First, the inner seal portion 21 of the lid plate 2 is brought into contact with and sealingly engaged with the first inclined portion 111 of the waist 11 of the housing 1. Optionally, the convex portion 112 of the waist 11 of the housing 1 is in abutting sealing engagement with the side seal portion 22 of the cover plate 2. When the inner sealing portion 21 is not tightly sealed with the first inclined portion 111, the sealing between the convex portion 112 and the side sealing portion 22 can still ensure the isolation of the inside of the case 1 from the outside, thereby preventing the leakage of the electrolyte. Optionally, the end of the housing 1 provided with the opening is in sealing fit with the top surface of the cover plate 2, that is, when the inner sealing portion 21 is not tightly sealed with the first inclined portion 111, and the convex portion 112 is not tightly sealed with the side sealing portion 22, the end of the housing 1 and the top surface of the cover plate 2 can still ensure the isolation of the inside of the housing 1 from the outside, and the leakage of the electrolyte is avoided.

In order to further ensure the sealing effect of the above-mentioned sealing position, optionally, a sealing ring 3 is circumferentially arranged between the housing 1 and the cover plate 2. Optionally, the sealing ring 3 comprises a first sealing portion 31, a second sealing portion 32, a third sealing portion 33 and a fourth sealing portion 34 connected in sequence. And the first sealing part 31, the second sealing part 32, the third sealing part 33 and the fourth sealing part 34 are of an integrated molding structure so as to ensure the strength of the sealing ring 3. Wherein the first sealing portion 31 is circumferentially disposed between the inner sealing portion 21 and the first inclined portion 111. Optionally, the second seal 32 is circumferentially disposed between the boss 112 and the side seal 22. Optionally, a third seal 33 is provided between the end of the opening and the top surface of the cover plate 2. Optionally, a fourth seal 34 is provided at the inner wall of the housing 1. It can be known that, first sealing portion 31, second sealing portion 32 and third sealing portion 33 have all been the enhancement sealed effect, and fourth sealing portion 34 can further guarantee that sealing washer 3 does not break away from out from between interior sealing 21 and first slope 111, and is favorable to finalizing the design with between shell 1 when processing. Optionally, the material of the sealing ring 3 is PFA, PBT or PP, which can ensure the insulation and corrosion resistance of the sealing ring 3.

Optionally, the cells of the cylindrical lithium battery are arranged in the housing 1. Optionally, an insulating gasket 4 is disposed between the battery cell and the cover plate 2 to ensure insulation between the battery cell and the cover plate 2.

The columnar lithium battery provided by the embodiment has a triple sealing structure and is excellent in sealing effect. Specifically, the triple seal structure includes: the seal between the inner seal portion 21 of the cover 2 and the first inclined portion 111 of the waist 11 of the housing 1, the seal between the convex portion 112 of the waist 11 and the side seal portion 22 of the cover 2, and the seal between the end of the housing 1 provided with the opening and the top surface of the cover 2. And in order to guarantee the effect of butt seal, seal ring 3 is all provided with in each department seal structure department, can avoid electrolyte to take place to leak. And, the column lithium cell that this embodiment provided compares in the lithium cell among the prior art, and the shell 1 of this column lithium cell sets up protruding waist 11, can improve the intensity of shell 1 greatly, and the processing of protruding waist 11 can not lead to the cladding material of shell 1 to drop, just can effectively avoid weeping and rusty risk to can solve the problem among the prior art.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A lithium pillar cell, comprising:

the shell (1), one end of the shell (1) is an opening, a convex waist (11) is circumferentially arranged on the side wall, close to the opening, of the shell (1), and the convex waist (11) comprises a first inclined part (111) far away from the opening;

the cover plate (2) is arranged at the opening in a covering mode, the side wall of the cover plate (2) comprises an inner sealing part (21) which is arranged in the circumferential direction and inclined towards the axis, and the inner sealing part (21) is abutted and matched with the first inclined part (111) in a sealing mode;

the sealing ring (3), the sealing ring (3) sets up shell (1) with between apron (2).

2. A lithium cylindrical battery according to claim 1, characterized in that the sealing ring (3) comprises a first sealing portion (31), the first sealing portion (31) being circumferentially arranged between the inner sealing portion (21) and the first inclined portion (111).

3. A lithium cylindrical battery according to claim 2, characterized in that the waist (11) further comprises a protrusion (112), the side wall of the cover plate (2) further comprises a circumferentially arranged side seal (22), and the protrusion (112) is in sealing engagement with the side seal (22).

4. A lithium cylindrical battery according to claim 3, characterized in that the sealing ring (3) further comprises a second sealing portion (32), the second sealing portion (32) being circumferentially arranged between the convex portion (112) and the side sealing portion (22).

5. A lithium cylindrical battery according to claim 4, characterized in that the end of the casing (1) provided with the opening sealingly engages the top surface of the cover plate (2).

6. A lithium cylindrical battery according to claim 5, characterized in that the sealing ring (3) further comprises a third sealing portion (33), the third sealing portion (33) being provided between the end of the opening and the top surface of the cover plate (2).

7. A lithium cylindrical battery according to claim 6, characterized in that the sealing ring (3) further comprises a fourth sealing portion (34), the fourth sealing portion (34) being provided at the inner wall of the casing (1).

8. A lithium cylindrical battery according to claim 1, characterized in that the inner seal (21) is provided at the end of the side wall of the cover plate (2) remote from the top surface of the cover plate (2).

9. The lithium pillar of claim 7, wherein the first sealing part (31), the second sealing part (32), the third sealing part (33) and the fourth sealing part (34) are of an integrally molded structure.

10. A lithium cylindrical battery according to any of claims 1 to 9, further comprising a cell disposed within the casing (1) and an insulating spacer (4), the insulating spacer (4) being disposed between the cell and the cover plate (2).