CN216903148U

CN216903148U - Cap sealing ring and cylindrical battery

Info

Publication number: CN216903148U
Application number: CN202122531411.1U
Authority: CN
Inventors: 刘燕林; 王建立; 高保清
Original assignee: Baoli New Energy Technology Co ltd
Current assignee: Baoli New Energy Technology Co ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-07-05
Anticipated expiration: 2031-10-20

Abstract

The utility model discloses a cap sealing ring, which comprises an inner edge sealing part and an outer edge sealing part which are connected with each other; the inner edge sealing part is provided with an inner edge groove, and the outer edge sealing part is provided with an outer edge groove; the opening directions of the inner edge groove and the outer edge groove are deviated; a first chamfer is arranged at the outer edge of the top of the inner edge groove, and a second chamfer is arranged at the inner edge of the top of the outer edge groove; when the cap sealing ring seals the steel shell, the top of the inner edge groove shrinks inwards and the top of the outer edge groove expands outwards, so that the contact area between the inner edge groove and the inner wall of the steel shell is increased. According to the cap sealing ring provided by the utility model, when the cap sealing ring seals a steel shell of a battery, the inner edge groove is inwards contracted to be attached to two sides of a corner of the inner wall of the steel shell, the outer edge groove is outwards expanded to be attached to battery components such as a sealing rolling groove and a cap, and due to the chamfer design, the contact area between the cap sealing ring and the surface of each component in the steel shell is increased, so that the sealing property is improved.

Description

Cap sealing ring and cylindrical battery

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of lithium batteries, in particular to a cap sealing ring and a cylindrical battery.

[ background of the utility model ]

Lithium ion batteries have been widely used in various digital products, portable products, electric vehicles and other energy storage products due to their advantages such as excellent cycle life and energy density. Among them, the sealing performance of lithium ion batteries is always one of the most critical core technologies of lithium batteries, and directly affects the stability and safety of the batteries. The cylindrical lithium ion battery is one of the longest common lithium battery shapes, and the sealing effect is directly related to the design of the sealing ring. Because the steel shell inner wall has very big radian after sealing, the square angle of current sealing washer or the radian of little radian can't be fine laminating with the steel shell inner wall, leads to the leakproofness not very good.

In view of the above, it is desirable to provide a cap seal and a cylindrical battery to overcome the above-mentioned drawbacks.

[ Utility model ] content

The utility model aims to provide a cap sealing ring and a cylindrical battery, and aims to solve the problem that the sealing property of the conventional battery sealing ring is poor, so that the requirements on the sizes of a sealing rolling groove of the cylindrical battery and parts inside the cap can be well met, and the sealing effect is greatly improved.

In order to achieve the above object, the present invention provides a cap sealing ring for sealing a steel can of a cylindrical battery, including an inner edge sealing portion and an outer edge sealing portion connected to each other; the inner edge sealing part is provided with an inner edge groove, and the outer edge sealing part is provided with an outer edge groove; the opening directions of the inner edge groove and the outer edge groove are deviated; a first chamfer with a preset size is arranged at the outer edge of the top of the inner edge groove, and a second chamfer with a preset size is arranged at the inner edge of the top of the outer edge groove; when the cap sealing ring seals the steel shell, the top of the inner edge groove is contracted inwards, and the top of the outer edge groove is expanded outwards, so that the contact area between the inner edge groove and the inner wall of the steel shell is increased.

In a preferred embodiment, the inner rim seal portion and the outer rim seal portion are connected by a connecting portion.

In a preferred embodiment, the first chamfer is in the opposite direction to the second chamfer.

In a preferred embodiment, the inner side of the top of the inner edge groove is acute, and the outer side of the top is obtuse; the outer side of the top of the outer edge groove is an acute angle, and the inner side of the top is an obtuse angle.

In a preferred embodiment, the inner rim seal portion and the outer rim seal portion are in the form of a concentrically arranged ring.

In a preferred embodiment, the inner rim groove and the outer rim groove are both U-shaped in cross section.

In a preferred embodiment, the cap sealing ring is a silicone ring or an insulating rubber ring.

The utility model also provides a cylindrical battery comprising the cap seal ring according to any one of the above embodiments.

The cap sealing ring provided by the utility model is provided with the integrated inner edge sealing part and outer edge sealing part, and chamfers with preset sizes are arranged at the outer edge of the top of the inner edge groove and the inner edge of the top of the outer edge groove, so that when the cap sealing ring seals a steel shell of a battery, the inner edge groove contracts inwards to be capable of being attached to two sides of a corner of the inner wall of the steel shell, the outer edge groove expands outwards to be capable of being attached to battery components such as a sealing rolling groove and a cap, and due to the chamfer design, the contact area between the cap sealing ring and the surface of each component in the steel shell is increased, and the sealing performance is improved.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a perspective view of a cap seal ring provided in the present invention;

FIG. 2 is a cross-sectional view of the cap seal ring shown in FIG. 1;

fig. 3 is a schematic sectional view of the cap sealing ring when the inner wall of the steel shell is sealed.

Reference numbers in the figures: 100. a cap sealing ring; 200. a steel shell; 10. an inner edge seal portion; 11. an inner edge groove; 12. a first chamfer; 20. an outer edge seal portion; 21. an outer edge groove; 22. a second chamfer; 30. a connecting portion.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantageous technical effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are given by way of illustration only and not by way of limitation.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

In an embodiment of the present invention, a cap sealing ring 100 is provided for sealing a steel case 200 of a cylindrical battery, for example, sealing a cylindrical battery sealing rolling groove and a cap, which can well meet the size requirements of each component, improve the bonding effect, and further improve the sealing performance. It should be noted that a plurality of cap sealing rings 100 may be disposed in the cylindrical battery, so that one cap sealing ring 100 is disposed at each corner of the inner wall of the steel shell 200.

As shown in fig. 1 and 2, the cap sealing ring 100 includes an inner edge sealing portion 10 and an outer edge sealing portion 20 connected to each other. The inner edge sealing part 10 and the outer edge sealing part 20 are connected by a connecting part 30 to form an integrated structure. The cap sealing ring 100 may be a silicone ring or an insulating rubber ring, or another insulating ring with certain elasticity. Further, the inner edge sealing portion 10 and the outer edge sealing portion 20 are in a concentric ring shape, and the radius thereof is set according to the requirement of the specific sealing size.

Specifically, the inner edge sealing portion 10 is provided with an inner edge groove 11, and the outer edge sealing portion 20 is provided with an outer edge groove 21. When the cap sealing ring 100 is pressed by an external force, the inner edge sealing portion 10 and the outer edge sealing portion 20 are deformed accordingly. The cross sections of the inner edge groove 11 and the outer edge groove 21 are both in a U shape, and the opening directions of the inner edge groove 11 and the outer edge groove 21 are deviated. That is, the U-shaped opening of the inner edge groove 11 faces inward, and the U-shaped opening of the outer edge groove 21 faces outward.

In the embodiment of the present invention, a first chamfer 12 with a predetermined size is provided at the outer edge of the top of the inner groove 11 (i.e. the lip of the U-shape, the side far from the bottom), and a second chamfer 22 with a predetermined size is provided at the inner edge of the top of the outer groove 21. The first chamfer 12 is in the opposite direction of the second chamfer 22. That is, the inner side of the top of the inner edge groove 11 is an acute angle, and the outer side of the top is an obtuse angle. The outer side of the top of the outer edge groove 21 is acute angle, and the inner side of the top is obtuse angle. As shown in fig. 3, when the cap sealing ring 100 seals the steel shell 200, for example, when the opening is sealed by a rolling groove and a cap, the inner edge sealing portion 10 and the outer edge sealing portion 20 are squeezed to deform, so that the top of the inner edge groove 11 contracts inwards and the top of the outer edge groove 21 expands outwards, and then the top end of the U-shape is more attached to the inner wall with a large radian inside the steel shell 200, so that the contact area with the inner wall of the steel shell 200 is increased, and the sealing performance is improved.

In addition, because the opening directions of the inner edge groove 11 and the outer edge groove 21 are deviated from each other, no matter the extrusion caused by the pressure of the external air and the pressure of the internal air, one U-shaped groove structure is deformed by compression, the sealing effect is increased, and therefore bidirectional sealing protection is achieved.

The present invention also provides a cylindrical battery (not shown in the drawings) including the cap seal 100 according to any one of the above embodiments.

In summary, the cap sealing ring 100 provided by the present invention is provided with the integrated inner edge sealing portion 10 and outer edge sealing portion 20, and the outer edge of the top of the inner edge groove 11 and the inner edge of the top of the outer edge groove 21 are both provided with chamfers of a predetermined size, so that when the cap sealing ring 100 seals the steel can 200 of the battery, the inner edge groove 11 contracts inwards to be able to attach to both sides of the corner of the inner wall of the steel can 200, and the outer edge groove 21 expands outwards to be able to attach to battery components such as the sealing rolling groove and the cap, and due to the chamfer design, the contact area between the cap sealing ring 100 and the surface of each component inside the steel can 200 is increased, thereby improving the sealing performance.

The utility model is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the utility model is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims

1. A cap sealing ring is used for sealing a steel shell of a cylindrical battery and is characterized by comprising an inner edge sealing part and an outer edge sealing part which are connected with each other; the inner edge sealing part is provided with an inner edge groove, and the outer edge sealing part is provided with an outer edge groove; the opening directions of the inner edge groove and the outer edge groove are deviated; a first chamfer with a preset size is arranged at the outer edge of the top of the inner edge groove, and a second chamfer with a preset size is arranged at the inner edge of the top of the outer edge groove; when the cap sealing ring seals the steel shell, the top of the inner edge groove shrinks inwards and the top of the outer edge groove expands outwards, so that the contact area between the inner edge groove and the inner wall of the steel shell is increased.

2. The bonnet seal as defined in claim 1 wherein the inner rim seal portion and the outer rim seal portion are connected by a connection portion.

3. The bonnet seal as defined in claim 1 wherein the first chamfer is opposite the second chamfer.

4. The cap seal of claim 3 wherein the inner rim groove has an acute top inner side and an obtuse top outer side; the outer side of the top of the outer edge groove is an acute angle, and the inner side of the top is an obtuse angle.

5. The bonnet seal as defined in claim 1 wherein the inner rim seal portion is annular and concentric with the outer rim seal portion.

6. The cap seal of claim 5 wherein the inner rim groove and the outer rim groove are both U-shaped in cross-section.

7. The cap seal according to claim 2, wherein the cap seal is a silicone ring or an insulating rubber ring.

8. A cylindrical battery comprising the cap seal according to any one of claims 1 to 7.