Sealing ring structure and lithium battery cover plate provided with sealing ring

Abstract

A sealing ring structure and a lithium battery cover plate provided with the sealing ring comprise a sealing ring, the sealing ring comprises a sealing ring body and an outer sealing ring layer, the section of the sealing ring body is in an isosceles octagon shape, the middle of the sealing ring body is of an annular structure, and the outer sealing ring layer is formed at the peripheral edge of the sealing ring body. An upper supporting face and a lower supporting face protrude from the upper side face and the lower side face of the sealing ring body respectively, the thickness of the outer sealing ring layer is smaller than that of the sealing ring body, the outer sealing ring layer is located in the middle of the sealing ring body in the thickness direction, and a sealing ring hole is formed in the middle of the sealing ring. The lithium battery cover plate comprises a cover plate, at least one electrode column and the sealing ring, and the sealing ring is positioned and mounted between the cover plate and the electrode column. The device has the advantages that the structure is simple, and enough expansion space is reserved; the sealing property and the insulating property between the battery cover plate and the electrode column are improved, and the service life is prolonged; the original structure is slightly changed, the sealing effect is optimally improved, and the production cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery accessories, and particularly relates to a sealing ring structure and a lithium battery cover plate installed with the sealing ring. Background Art

[0002] Lithium batteries have been popular in people's lives. The cover plate is one of the essential components of a lithium battery. The electrode post and explosion-proof design are generally integrated on the cover plate. If there is a problem with the cover plate, it may cause problems such as electric leakage, liquid leakage, explosion-proof failure, and shell expansion. When the electrode post is connected to the battery cover plate, a sealing ring is usually provided between the two. The sealing ring is both to insulate the electrode post from the battery cover plate and to form a sealed connection between the electrode post and the battery cover plate. However, the cross-sectional shape of the traditional sealing ring is square, which is not suitable for this technical field because the square outer diameter has no expansion space. After heating, it can only expand inward, resulting in the part that expands inward after cooling being unable to return to its original position, thus greatly reducing the sealing performance. To address the above problems, the industry often uses a sealing ring with a circular cross-section, and a narrowed outer sealing ring layer and an inner sealing ring layer are respectively formed on the outer circumference and the inner circumference of the circular sealing ring. In this way, there is sufficient expansion space on both sides of the sealing ring. In addition to leaving sufficient expansion space, the outer sealing ring layer and the inner sealing ring layer also play a certain supporting role. However, it is found during the installation process that it is very difficult to position the sealing ring with this structure because the circular convex part forms a tangential contact with the electrode post and the battery cover plate, and the contact area between them is very small. In addition, when the inner sealing ring layer expands excessively inward due to an accident, it is possible that the part that expands inward cannot return to its original position.

[0003] In view of the above problems, it is necessary to design a sealing ring with a simple structure, sufficient expansion space reserved, and the upper and lower sides can be in full contact and positioned with the battery cover plate and the electrode post respectively, as well as a lithium battery cover plate installed with the sealing ring. For this reason, the applicant of the present invention has ingeniously designed this technical solution. Summary of the Utility Model

[0004] The primary task of the present invention is to provide a sealing ring structure for a lithium battery cover plate, which helps to improve the sealing ring structure to increase the contact area at the sealing position, enable the sealing ring to be installed and squeezed and expanded at an appropriate position, and prevent the inner diameter of the sealing ring from expanding excessively, which is beneficial to improving the sealing performance and insulation performance between the battery cover plate and the electrode post.

[0005] Another task of the present invention is to provide a lithium battery cover plate installed with the sealing ring, which helps to improve the anti-electric leakage and anti-liquid leakage performance of the lithium battery cover plate.

[0006] To accomplish the primary task, the technical solution provided by the present utility model is: a sealing ring structure, including a sealing ring, which includes a sealing ring body with an isosceles octagon cross-section and a ring structure formed in the middle, and an outer sealing ring layer formed at the outer peripheral edge position of the sealing ring body. An upper support surface and a lower support surface respectively protrude from the upper side and the lower side of the sealing ring body. The thickness of the outer sealing ring layer is less than that of the sealing ring body and the outer sealing ring layer is located at the middle position in the thickness direction of the sealing ring body. A sealing ring hole is enclosed by the sealing ring body in the middle of the sealing ring.

[0007] In a specific embodiment of the present utility model, the sealing ring is an integrally formed rubber structure.

[0008] In another specific embodiment of the present utility model, the outer peripheral edge of the outer sealing ring layer is one of a wave shape, a serrated shape, and a boss tooth shape.

[0009] In yet another specific embodiment of the present utility model, the upper support surface and the lower support surface are parallel planar structures.

[0010] In still another specific embodiment of the present utility model, the widths of the upper support surface and the lower support surface are the same or different.

[0011] In still another specific embodiment of the present utility model, the widths of the upper support surface and the lower support surface are greater than or equal to one half of the cross-sectional width of the sealing ring body.

[0012] To accomplish another task, the technical solution provided by the present utility model is: a lithium battery cover plate, including a cover plate and at least one electrode post, and further including a sealing ring. The sealing ring is disposed between the cover plate and the electrode post. The cover plate is provided with a circumferential lower embedding groove at a position corresponding to the sealing ring, and the electrode post is provided with a circumferential upper embedding groove at a position corresponding to the sealing ring. The upper support surface and the lower support surface are respectively snapped into the upper embedding groove and the lower embedding groove to achieve the positioning and installation of the sealing ring.

[0013] In a further specific embodiment of the present utility model, at least one electrode post cavity is formed on the cover plate, and a circumferential border extends upward around the electrode post cavity. The sealing ring and the electrode post are respectively placed in the electrode post cavity. The lower embedding groove is opened on the wall body at the bottom of the electrode post cavity and on the side facing the sealing ring, and the upper embedding groove is opened at the bottom of the electrode post and on the side facing the sealing ring.

[0014] After the present utility model adopts the above structure, it has the following beneficial effects: First, since the sealing ring adopts a structure with an isosceles octagon cross-section in cooperation with a corrugated outer sealing ring layer, the upper and lower sides of the sealing ring can be installed and squeezed and expanded at appropriate positions, and the situation of excessive expansion of the inner diameter of the sealing ring can be avoided, effectively improving the sealing performance and insulation performance between the battery cover plate and the electrode post, and extending the service life. Second, since the above-mentioned sealing ring is adopted for the lithium battery cover plate, the anti-electric leakage and anti-liquid leakage performance of the lithium battery cover plate have been greatly improved. In addition, this technical solution makes few changes to the original structure, realizes the optimal improvement of the sealing effect, can make full use of the original production line for production, and has low production cost, which has significant popularization significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a plane structure cross-sectional view of an embodiment of the sealing ring of the present utility model;

[0016] Figure 2 is Figure 1 the top view of the embodiment;

[0017] Figure 3 is a structural schematic diagram of the sealing ring of the present utility model applied to the battery cover plate.

[0018] In the figure: 1. Sealing ring, 11. Sealing ring body, 111. Sealing ring hole, 112. Upper support surface, 113. Lower support surface, 12. Outer sealing ring layer; 2. Cover plate, 21. Electrode post cavity, 211. Lower embedding groove, 22. Perimeter; 3. Electrode post, 31. Upper embedding groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following describes the specific embodiments of the present utility model in detail with reference to the drawings. However, the description of the embodiments is not a limitation of the technical solution. Any change in form rather than substance based on the concept of the present utility model should be regarded as the protection scope of the present utility model.

[0020] In the following description, all directional or positional concepts such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and thus cannot be understood as a special limitation of the technical solution provided by the present utility model.

[0021] Please refer to Figure 1 and combine with Figure 2, which schematically shows a sealing ring structure, including a sealing ring 1. The sealing ring 1 is an integrally formed rubber structure, which includes a sealing ring body 11 with an isosceles octagon cross-section and a ring structure in the middle, and an outer sealing ring layer 12 formed at the outer peripheral edge of the sealing ring body 11. An upper support surface 112 and a lower support surface 113 protrude from the upper side and the lower side of the sealing ring body 11 respectively. The thickness of the outer sealing ring layer 12 is less than that of the sealing ring body 11 and the outer sealing ring layer 12 is located at the middle position in the thickness direction of the sealing ring body 11. A sealing ring hole 111 is enclosed by the sealing ring body 11 in the middle of the sealing ring 1. The upper support surface 112 and the lower support surface 113 are parallel planar structures.

[0022] Further, the shape of the outer peripheral edge of the outer sealing ring layer 12 is not restricted in any way and can be one of a waveform, a serrated shape, and a boss tooth shape. In this embodiment, the outer peripheral edge of the outer sealing ring layer 12 is preferably a waveform.

[0023] Further, the widths of the upper support surface 112 and the lower support surface 113 can be the same or different. In this embodiment, they are preferably the same.

[0024] Further, the widths of the upper support surface 112 and the lower support surface 113 are greater than or equal to half of the cross-sectional width of the sealing ring body 11.

[0025] Please refer to Figure 3 and combine with Figure 1 , Figure 2 , which schematically shows a lithium battery cover plate, including a cover plate 2 and at least one electrode post 3, and also including a sealing ring 1. The sealing ring 1 is arranged between the cover plate 2 and the electrode post 3. The cover plate 2 is provided with a circular lower embedding groove 211 at the position corresponding to the sealing ring 1. The electrode post 3 is provided with a circular upper embedding groove 31 at the position corresponding to the sealing ring 1. The upper support surface 112 and the lower support surface 113 are respectively clamped into the upper embedding groove 31 and the lower embedding groove 211 to realize the positioning and installation of the sealing ring 1.

[0026] Further, at least one electrode post cavity 21 is formed on the cover plate 2. A surrounding edge 22 extends upward around the electrode post cavity 21. The sealing ring 1 and the electrode post 3 are respectively placed in the electrode post cavity 21. The lower embedding groove 211 is opened on the wall body at the bottom of the electrode post cavity 21 and on the side facing the sealing ring 1. The upper embedding groove 31 is opened at the bottom of the electrode post 3 and on the side facing the sealing ring 1.

[0027] Please continue to refer to Figures 1 to 3, during the assembly process of the aforementioned cover plate 2, the upper edge of its peripheral edge 22 will be folded inward and pressed against the periphery of the electrode post 3. The aforementioned electrode post 3 then presses the sealing ring 1 downward. At this time, since the upper support surface 112 and the lower support surface 113 of the aforementioned sealing ring 1 are respectively fitted into the upper fitting groove 31 and the lower fitting groove 211, the positioning and installation of the sealing ring 1 are realized and it will not deviate. When the aforementioned sealing ring 1 is squeezed at the sealing ring body 11, it will expand toward the outer sealing ring layer 12 side and the sealing ring hole 111 side. Since the outer sealing ring layer 12 is located at the upper and lower sides and the edge of the sealing ring body 11, there is sufficient expansion space for the outer sealing ring layer 12 at this position. And the aforementioned sealing ring 1 also has sufficient expansion space on the side close to the sealing ring hole 111 because the inner sealing ring layer in the prior art is omitted.

Claims

1. A sealing ring structure, comprising a sealing ring (1), characterized in that: The sealing ring (1) comprises a sealing ring body (11) having an isosceles octagonal cross section and a ring-shaped structure in the middle, and an outer sealing ring layer (12) formed at the outer peripheral edge of the sealing ring body (11); an upper supporting surface (112) and a lower supporting surface (113) are respectively protruded from the upper side and the lower side of the sealing ring body (11); the thickness of the outer sealing ring layer (12) is smaller than the thickness of the sealing ring body (11) and the outer sealing ring layer (12) is located in the middle of the sealing ring body (11) in the thickness direction; and a sealing ring hole (111) is surrounded by the sealing ring body (11) in the middle of the sealing ring (1).

2. A sealing ring structure according to claim 1, characterized in that: The sealing ring (1) is an integrally formed rubber structure.

3. A sealing ring structure according to claim 1, characterized in that: The outer peripheral edge of the outer sealing ring layer (12) is in one of the following shapes: wave-shaped, sawtooth-shaped, and boss-shaped.

4. A sealing ring structure according to claim 1, characterized in that: The upper supporting surface (112) and the lower supporting surface (113) are planar structures parallel to each other.

5. A sealing ring structure according to claim 4, characterized in that: The widths of the upper supporting surface (112) and the lower supporting surface (113) are the same or different.

6. A sealing ring structure according to claim 4, characterized in that: The width of the upper supporting surface (112) and the lower supporting surface (113) is greater than or equal to one half of the cross-sectional width of the sealing ring body (11).

7. A lithium battery cover plate, comprising a cover plate (2) and at least one electrode column (3), characterized in that: It also comprises a sealing ring (1) as claimed in any one of claims 1 to 6, wherein the sealing ring (1) is arranged between the cover plate (2) and the electrode column (3), the cover plate (2) is provided with a circle of lower embedding grooves (211) at a position corresponding to the sealing ring (1), and the electrode column (3) is provided with a circle of upper embedding grooves (31) at a position corresponding to the sealing ring (1), and the upper supporting surface (112) and the lower supporting surface (113) are respectively inserted into the upper embedding groove (31) and the lower embedding groove (211) to realize the positioning and installation of the sealing ring (1).

8. A lithium battery cover according to claim 7, characterized in that: At least one electrode column cavity (21) is formed on the cover plate (2), a peripheral edge (22) extending upwardly around the electrode column cavity (21), the sealing ring (1) and the electrode column (3) are respectively placed in the electrode column cavity (21), the lower embedding groove (211) is provided on the wall at the bottom of the electrode column cavity (21) and faces one side of the sealing ring (1), and the upper embedding groove (31) is provided at the bottom of the electrode column (3) and faces one side of the sealing ring (1).

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