Sealing ring, battery top cover and battery structure

Abstract

The utility model belongs to the technical field of battery sealing, and discloses a sealing ring, a battery top cover and a battery structure. The sealing ring comprises an inner sealing ring, an outer sealing ring and a connecting part, and the inner sealing ring is of an annular structure. The outer sealing ring is of an annular structure and surrounds the outer side of the inner sealing ring. The connecting part is of an annular structure and is connected between the inner sealing ring and the outer sealing ring, in the height direction, the height of the connecting part is smaller than the height of the inner sealing ring and the height of the outer sealing ring, and the connecting part is connected to the middle of the outer wall of the inner sealing ring and the middle of the inner wall of the outer sealing ring. According to the sealing ring, the contact area between the sealing ring and the upper and lower compression surfaces can be reduced, so that the influence of the flatness of the compression surfaces on the air tightness is reduced, the rebound force after the sealing ring is compressed can be reduced, the compression difficulty is reduced, the sealing effect of the sealing ring is improved, and the dimensional accuracy and the structural stability of a product are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery sealing, in particular to a sealing ring, a battery top cover and a battery structure. Background Art

[0002] As a core energy storage component, the sealing performance of the battery directly affects the safety factor of power consumption. The battery top cover in the battery is a key component that determines the sealing performance of the battery, and the reliability of its airtightness directly determines the reliability of the subsequent battery. If the battery top cover fails, it will cause internal battery leakage, reduced energy storage performance, and even lead to the risks of battery short circuit, fire, and explosion. Currently, the sealing performance of the battery top cover mainly relies on the compression of the sealing ring by the pole column or the cover plate. When designing the battery top cover, a sealing ring is usually used for assembly. When the sealing ring is compressed, an insulating and sealing effect can be achieved at the pole column of the battery.

[0003] In the prior art, the overall structure of the commonly used sealing ring is a flat ring. When using a sealing ring with this structure, the sealing area between the sealing ring and the flat surface of the cover plate or the pole column is large. At this time, the flatness of the cover plate and the pole column has a great influence on the airtightness of the battery top cover, and the sealing ring has a large rebound force and a small space for accommodating the deformation of the sealing ring, resulting in unstable dimensions of the sealing ring after compression.

[0004] Therefore, there is an urgent need for a sealing ring, a battery top cover and a battery structure to solve the above problems. Summary of the Utility Model

[0005] The first object of the utility model is to provide a sealing ring, which can reduce the contact area between the sealing ring and the pole column, provide a space for accommodating the compression deformation of the sealing ring, and improve the sealing performance of the sealing ring.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Provide a sealing ring, including:

[0008] An inner sealing ring, the inner sealing ring is of an annular structure;

[0009] An outer sealing ring, the outer sealing ring is of an annular structure, and the outer sealing ring is arranged around the outside of the inner sealing ring;

[0010] A connecting part, the connecting part is of an annular structure, the connecting part is connected between the inner sealing ring and the outer sealing ring, in the height direction, the height of the connecting part is less than the height of the inner sealing ring and the height of the outer sealing ring, and the connecting part is connected to the middle of the outer wall of the inner sealing ring and the middle of the inner wall of the outer sealing ring.

[0011] As an alternative to the sealing ring, the inner sealing ring includes an inner wall surface, and chamfers are provided at both the top edge and the bottom edge of the inner wall surface.

[0012] The second object of the present invention is to provide a battery top cover with good sealing performance and dimensional stability.

[0013] To achieve this purpose, the present invention adopts the following technical solutions:

[0014] Provide a battery top cover, including a cover plate, a pole column and the above-mentioned sealing ring. The pole column penetrates through the cover plate and the sealing ring, and the sealing ring is located below the cover plate.

[0015] As an alternative to the battery top cover, the pole column includes an upper pole column and a lower pole column. The lower pole column is located below the sealing ring, and the upper pole column penetrates through the cover plate and the sealing ring to be connected to the lower pole column.

[0016] As an alternative to the battery top cover, the upper pole column is provided with a stepped structure, and the inner sealing ring is located between the stepped structure and the lower pole column in the height direction.

[0017] As an alternative to the battery top cover, the outer sealing ring is located between the cover plate and the lower pole column.

[0018] As an alternative to the battery top cover, the battery top cover further includes a lower insulating member. The lower insulating member is disposed around the sealing ring, and the lower insulating member is located between the cover plate and the lower pole column in the height direction.

[0019] As an alternative to the battery top cover, the battery top cover further includes an upper insulating member. The upper insulating member is disposed around the pole column, and the upper insulating member is located between the pole column and the cover plate in a direction perpendicular to the height direction.

[0020] As an alternative to the battery top cover, the cover plate is provided with an explosion-proof hole, and the battery top cover further includes an explosion-proof sheet. The explosion-proof sheet is connected to the cover plate and covers the explosion-proof hole.

[0021] The third object of the present invention is to provide a battery structure, the battery top cover of which has good sealing performance and dimensional stability, ensuring the safety performance and structural stability of the battery structure.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] Provide a battery structure, including a housing and the above-mentioned battery top cover. The battery top cover is sealingly connected to the opening of the housing.

[0024] Advantages of the present utility model:

[0025] The present utility model provides a sealing ring, which includes an inner sealing ring, an outer sealing ring and a connecting part. The inner sealing ring, the outer sealing ring and the connecting part are all annular structures, and the outer sealing ring, the connecting part and the inner sealing ring are sequentially surrounded and connected from outside to inside. The height of the connecting part is less than the height of the inner sealing ring and the height of the outer sealing ring, and the connecting part is connected to the middle of the inner wall of the outer sealing ring and the middle of the outer wall of the inner sealing ring, so that when the sealing ring is compressed, it only contacts and compresses with the inner sealing ring and the outer sealing ring. There is a gap between the connecting part and the upper and lower compression surfaces, thereby reducing the contact area between the sealing ring and the upper and lower compression surfaces, reducing the influence of the flatness of the upper and lower compression surfaces on the airtightness, and improving the sealing effect of the sealing ring. At the same time, since there is a gap between the connecting part and the upper and lower compression surfaces, the connecting part is not compressed. Compared with the prior art, the volume of the part of the sealing ring participating in compression is reduced, thereby reducing the rebound force of the sealing ring; and a first accommodating space is formed above the connecting part, and a second accommodating space is formed below the connecting part. When the inner sealing ring and the outer sealing ring are compressed, the first accommodating space and the second accommodating space provide an accommodating space for the deformation of the inner sealing ring and the outer sealing ring, so that when the sealing ring is compressed, it bulges in the direction with a smaller rebound force, thereby further reducing the rebound force after the sealing ring is compressed, reducing the compression difficulty, and being beneficial to ensuring the dimensional accuracy and structural stability of the product.

[0026] The present utility model also provides a battery top cover, which includes a pole column, a cover plate and the above-mentioned sealing ring, can reduce the rebound force of the sealing ring, ensure the sealing effect of the battery top cover, and improve the dimensional stability of the battery top cover.

[0027] The present utility model also provides a battery structure, which includes the above-mentioned battery top cover and a housing. The battery top cover is hermetically connected to the opening of the housing. The battery top cover has good sealing performance and dimensional stability, ensuring the safety performance and structural stability of the battery structure. Description of the Drawings

[0028] Figure 1 is a cross-sectional view of the sealing ring provided by the present utility model;

[0029] Figure 2 is a cross-sectional view of the battery top cover provided by the present utility model.

[0030] In the figure:

[0031] 1, inner sealing ring; 11, inner wall surface; 12, chamfer;

[0032] 2, outer sealing ring;

[0033] 3, connecting part; 31, first accommodating space; 32, second accommodating space;

[0034] 100. Cover plate; 110. Explosion-proof hole

[0035] 200. Terminal post; 210. Upper terminal post; 211. Step structure; 212. Contact portion; 213. Penetrating portion; 220. Lower terminal post

[0036] 300. Lower insulating member; 400. Upper insulating member; 500. Explosion-proof sheet Detailed implementation manners

[0037] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings

[0038] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to" and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations

[0039] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the non-direct contact between the first and second features but through other features therebetween. Moreover, the first feature being "above", "above the top" and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or only indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom" and "under the bottom" of the second feature includes the first feature being directly below and obliquely below the second feature, or only indicating that the first feature is at a lower horizontal height than the second feature

[0040] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for differentiation in description and have no special meanings

[0041] Embodiment 1

[0042] As Figure 1As shown in the figure, the sealing ring of this embodiment includes an inner sealing ring 1, an outer sealing ring 2, and a connecting portion 3. The inner sealing ring 1 is of an annular structure. The outer sealing ring 2 is of an annular structure, and the outer sealing ring 2 is disposed around the outside of the inner sealing ring 1. The connecting portion 3 is of an annular structure. The connecting portion 3 is connected between the inner sealing ring 1 and the outer sealing ring 2. In the height direction, the height of the connecting portion 3 is less than the height of the inner sealing ring 1 and the height of the outer sealing ring 2. The connecting portion 3 is connected to the middle of the outer wall of the inner sealing ring 1 and the middle of the inner wall of the outer sealing ring 2. Wherein, the height direction is Figure 1 the X direction in

[0043] Based on the above design, since the height of the connecting portion 3 is less than the height of the inner sealing ring 1 and the height of the outer sealing ring 2, and the connecting portion 3 is connected to the middle of the inner wall of the outer sealing ring 2 and the middle of the outer wall of the inner sealing ring 1, there is a gap between the connecting portion 3 and the upper and lower compression surfaces. When the sealing ring is compressed, the upper and lower compression surfaces only contact and compress with the inner sealing ring 1 and the outer sealing ring 2. There is a gap between the connecting portion 3 and the upper and lower compression surfaces, thereby reducing the contact area between the sealing ring and the upper and lower compression surfaces, reducing the influence of the flatness of the upper and lower compression surfaces on the airtightness, and improving the sealing effect of the sealing ring. At the same time, since the connecting portion 3 is not compressed, compared with the prior art, the volume of the sealing ring participating in the compression is reduced, thereby reducing the rebound force of the sealing ring. Moreover, the upper surfaces of the inner sealing ring 1, the outer sealing ring 2, and the connecting portion 3 form a first accommodating space 31, and the lower surfaces of the inner sealing ring 1, the outer sealing ring 2, and the connecting portion 3 form a second accommodating space 32. When the inner sealing ring 1 and the outer sealing ring 2 are compressed, the first accommodating space 31 and the second accommodating space 32 provide an accommodating space for the deformation of the inner sealing ring 1 and the outer sealing ring 2, enabling the sealing ring to expand in the direction with a smaller rebound force when compressed, thereby further reducing the rebound force after the sealing ring is compressed, reducing the compression difficulty, and being beneficial to ensuring the dimensional accuracy and structural stability of the product.

[0044] Furthermore, the inner sealing ring 1 includes an inner wall surface 11. Chamfers 12 are provided at both the top edge and the bottom edge of the inner wall surface 11, enabling the inner sealing ring 1 to expand in different directions when compressed, further reducing the rebound force of the sealing ring, and also preventing the inner sealing ring 1 from protruding inward and being excessively squeezed and damaged when compressed and deformed. Preferably, the angle of the chamfer 12 can be set to 30° - 60°. Exemplarily, the angle of the chamfer 12 can be set to 30°, 45°, or 60°, etc.

[0045] Embodiment Two

[0046] As Figure 2As shown in the figure, this embodiment provides a battery top cover, which includes a cover plate 100, a pole column 200, and the above-mentioned sealing ring. The pole column 200 passes through the cover plate 100 and the sealing ring, and the sealing ring is located below the cover plate 100. This battery top cover can reduce the rebound force of the sealing ring, ensure the sealing effect of the battery top cover, and improve the dimensional stability of the battery top cover.

[0047] In this embodiment, the pole column 200 includes an upper pole column 210 and a lower pole column 220. The lower pole column 220 is located below the sealing ring. The upper pole column 210 passes through the cover plate 100 and the sealing ring and is connected to the lower pole column 220. Specifically, the upper pole column 210 includes an abutting portion 212 and a penetrating portion 213. The abutting portion 212 is connected above the penetrating portion 213. The abutting portion 212 is located above the cover plate 100 and abuts against the cover plate 100. The penetrating portion 213 passes through the cover plate 100, the sealing ring, and the lower pole column 220, and the penetrating portion 213 is connected to the lower pole column 220 to ensure the connection strength of the pole column 200. The sealing ring is compressed between the lower pole column 220 and the cover plate 100 to achieve the seal between the lower pole column 220 and the cover plate 100.

[0048] Furthermore, the upper pole column 210 further includes a step structure 211. The inner sealing ring 1 is compressed between the step structure 211 and the lower pole column 220 in the height direction to achieve the seal between the upper pole column 210 and the lower pole column 220.

[0049] Even further, the outer sealing ring 2 is compressed between the cover plate 100 and the lower pole column 220, so that the outer sealing ring 2 and the inner sealing ring 1 are respectively compressed between different structures. Through the inclination, bending and other deformations of the connecting portion 3, the outer sealing ring 2 and the inner sealing ring 1 can be properly misaligned in the height direction, so as to adapt to the height error between the upper pole column 210, the lower pole column 220 and the cover plate, improve the flexibility and applicability of the sealing ring, and further ensure the sealing effect of this battery top cover.

[0050] Optionally, the battery top cover further includes an upper insulating part 400. The upper insulating part 400 is disposed around the pole column 200, and the upper insulating part 400 is located between the pole column 200 and the cover plate 100 in a direction perpendicular to the height direction to achieve insulation between the upper surface of the cover plate 100 and the upper pole column 210.

[0051] Optionally, the battery top cover further includes a lower insulating part 300. The lower insulating part 300 is disposed around the sealing ring. The lower insulating part 300 is located between the cover plate 100 and the lower pole column 220 in the height direction to achieve insulation between the lower surface of the cover plate 100 and the lower pole column 220. Preferably, a certain gap is reserved between the lower insulating part 300 and the sealing ring to accommodate the deformation of the sealing ring, reduce the extrusion of the sealing ring, and ensure the service life of the sealing ring.

[0052] Furthermore, the cover plate 100 is provided with an explosion-proof hole 110. The battery top cover further includes an explosion-proof sheet 500. The explosion-proof sheet 500 is connected to the cover plate 100 and covers the explosion-proof hole 110. When the internal heat pressure of the battery is too high, the internal pressure of the battery can be released through the explosion-proof sheet 500 and the explosion-proof hole 110 to ensure the safety of the battery.

[0053] Embodiment III

[0054] This embodiment provides a battery structure, including a housing, an electric core, and the above-mentioned battery top cover. The electric core is disposed inside the housing, and the battery top cover is sealingly connected to the opening of the housing. The battery top cover has good sealing performance and dimensional stability, ensuring the safety performance and structural stability of the battery structure.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A sealing ring, characterized in that, Comprising: An inner sealing ring (1), the inner sealing ring (1) being of an annular structure; An outer sealing ring (2), the outer sealing ring (2) being of an annular structure, the outer sealing ring (2) being disposed around the outside of the inner sealing ring (1); A connecting portion (3), the connecting portion (3) being of an annular structure, the connecting portion (3) being connected between the inner sealing ring (1) and the outer sealing ring (2), in the height direction, the height of the connecting portion (3) being less than the height of the inner sealing ring (1) and the height of the outer sealing ring (2), the connecting portion (3) being connected to the middle of the outer wall of the inner sealing ring (1) and the middle of the inner wall of the outer sealing ring (2).

2. The sealing ring according to claim 1, wherein The inner sealing ring (1) includes an inner wall surface (11), chamfers (12) being provided at both the top edge and the bottom edge of the inner wall surface (11).

3. A battery top cover, characterized in that, Comprising a cover plate (100), a pole column (200) and the sealing ring according to claim 1 or 2, the pole column (200) passing through the cover plate (100) and the sealing ring, the sealing ring being located below the cover plate (100).

4. The battery top cover according to claim 3, characterized in that, The pole column (200) includes an upper pole column (210) and a lower pole column (220), the lower pole column (220) being located below the sealing ring, the upper pole column (210) passing through the cover plate (100) and the sealing ring to be connected to the lower pole column (220).

5. The battery top cover according to claim 4, wherein The upper pole column (210) is provided with a stepped structure (211), the inner sealing ring (1) being located between the stepped structure (211) and the lower pole column (220) in the height direction.

6. The battery top cover according to claim 4, characterized in that, The outer sealing ring (2) is located between the cover plate (100) and the lower pole column (220).

7. The battery top cover according to claim 4, characterized in that, The battery top cover further includes a lower insulating member (300), the lower insulating member (300) being disposed around the sealing ring, the lower insulating member (300) being located between the cover plate (100) and the lower pole column (220) in the height direction.

8. The battery top cover according to claim 3, wherein The battery top cover further includes an upper insulating member (400), the upper insulating member (400) being disposed around the pole column (200), and the upper insulating member (400) being located between the pole column (200) and the cover plate (100) in a direction perpendicular to the height direction.

9. The battery top cover according to claim 3, wherein The cover plate (100) is provided with an explosion-proof hole (110), the battery top cover further including an explosion-proof sheet (500), the explosion-proof sheet (500) being connected to the cover plate (100) and covering the explosion-proof hole (110).

10. A battery structure, characterized in that, Comprising a housing and the battery top cover according to any one of claims 3 - 9, the battery top cover being sealingly connected to the opening of the housing.

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