Sealing ring and battery cover plate

Abstract

The utility model discloses a sealing ring and a battery cover plate, the sealing ring is provided with an annular sealing part, the annular sealing part is provided with two symmetrical sealing surfaces, the two sealing surfaces are respectively provided with an annular matching bulge close to the middle part, and the annular matching bulges and the annular sealing part are concentrically distributed. According to the sealing ring and the battery cover plate provided by the invention, the compression force can be firstly borne through the annular matching bulge after the battery and the plastic are heated, so that the sealing effect of the sealing surface of the sealing ring is ensured, and the sealing precision is higher.

Description

Technical Field

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

[0002] The battery cover generally adopts an in-mold injection molding structure, in which the explosion-proof valve and the cover are connected by laser welding. After the two are welded, it is necessary to ensure the airtightness of the explosion-proof valve and the cover when the helium leak rate does not exceed 1*10^-7Pa.m^3 / s, and the burst value can be ruptured and exhausted in time under an air pressure of 0.8±0.2MPa. The explosion-proof piece applies an air pressure of 0.15MPa from the inside to the outside and from the outside to the inside for 30s for breathing test for 10 cycles, and the burst value can be ruptured and exhausted in time under an air pressure of 0.8±0.2MPa.

[0003] Conventional sealing rings are basically O-shaped flat gaskets or L-shaped sealing rings, which mainly rely on two planes to compress 30%-45% to ensure airtightness. In the battery cover, when the battery heats up and the plastic is deformed, the plastic is easily slightly floated due to the tension of the sealing ring, affecting the sealing effect. Utility Model Content

[0004] The embodiment of the present application provides a sealing ring and a battery cover, which can first withstand the compression force through the annular matching protrusion after the battery and the plastic are heated, so as to ensure the sealing effect of the sealing surface of the sealing ring and have higher sealing accuracy.

[0005] In a first aspect, an embodiment of the present application provides a sealing ring, which has an annular sealing portion, wherein the annular sealing portion has two symmetrical sealing surfaces, and the two sealing surfaces are respectively provided with annular mating protrusions near the middle, and the annular mating protrusions are concentrically distributed with the annular sealing portion.

[0006] In a possible implementation manner, the annular mating protrusion is an arc-shaped protrusion, a triangular protrusion, or a square protrusion.

[0007] In a possible implementation, the sealing ring is an L-shaped sealing ring, and the sealing ring further has a sleeve portion connected to the inner side of the annular sealing portion, and in the thickness direction of the annular sealing portion, the sleeve portion protrudes from any one of the sealing surfaces by a predetermined distance, and the sleeve portion is flush with the other sealing surface;

[0008] The annular matching protrusion is a semicircular protrusion, and the protruding height of the annular matching protrusion is 0.4-0.65 times the height of the sleeve portion protruding from the sealing surface.

[0009] In a possible implementation, the annular mating protrusion is located in the middle of the sealing surface, and the diameter of the annular mating protrusion is 0.3-0.4 times the radial dimension of a single side of the annular sealing portion.

[0010] In the second aspect, an embodiment of the present application also provides a battery cover, comprising a light cover, an explosion-proof valve and two pole assemblies, wherein the explosion-proof valve is arranged in the middle of the light cover, and the two pole assemblies are symmetrically arranged at both ends of the light cover with the explosion-proof valve as the center point, and a lower plastic is arranged at the bottom of the light cover, and the pole assembly comprises a pole and the aforementioned sealing ring, the pole vertically penetrates the lower plastic and the light cover from the bottom of the lower plastic, and an upper plastic suitable for being sleeved on the column of the pole is arranged on the top of the light cover, the pole also includes a bottom plate coaxially connected to the column, the bottom plate abuts against the bottom of the lower plastic, the sealing ring is sleeved on the column, and the annular sealing portion connects the light cover and the bottom plate at the top and bottom sides respectively.

[0011] Beneficial effect: Compared with the prior art, the sealing ring and battery cover provided by the present application are provided with annular mating protrusions on two symmetrical sealing surfaces of the annular sealing part, and the annular mating protrusions and the annular sealing part are concentrically distributed. When the battery heats up and causes the plastic to heat up, the annular mating protrusions will be compressed preferentially under the same pressure due to the tension of the sealing ring, that is, the annular mating protrusions will first bear the compression force, which can ensure that the sealing part of the sealing ring is still maintained at a compression amount of 30%-45%, thereby ensuring the sealing effect of the sealing ring and the battery cover to a certain extent, and the sealing accuracy is higher.

[0012] These and other purposes, features and advantages of the present invention are fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional structural schematic diagram of the sealing ring of the present application is shown.

[0014] Figure 2 A schematic cross-sectional structure diagram of the sealing ring of the present application is shown.

[0015] Figure 3 A three-dimensional structural schematic diagram of the battery cover of the present application is shown.

[0016] Figure 4 A schematic diagram of the exploded structure of the battery cover of the present application is shown.

[0017] Figure 5 A partial cross-sectional structural schematic diagram of the battery cover plate of the present application is shown. DETAILED DESCRIPTION

[0018] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0019] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0020] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0021] refer to Figure 1 and Figure 2 In the first aspect of the embodiment of the present application, a sealing ring 10 is provided. The sealing ring has an annular sealing portion 11. The annular sealing portion 11 has two symmetrical sealing surfaces, and the two sealing surfaces are respectively provided with annular mating protrusions 12 near the middle, and the annular mating protrusions 12 are concentrically distributed with the annular sealing portion 11. In this way, under the same pressure, the annular mating protrusions 12 will preferably be compressed by force. Therefore, within a certain pressure range (within the pressure range that the annular mating protrusions 12 can withstand), it can still ensure that the sealing part of the sealing ring 10 is maintained at a compression amount of 30%-45%, which can effectively ensure the inherent sealing effect of the sealing ring 10 and the sealing accuracy is higher. Specifically, when the sealing ring 10 is installed on the battery cover, when the battery heats up and the plastic is heated and affected by the tension of the sealing ring 10, the annular mating protrusion 12 is compressed first, and the sealing part of the sealing ring 10, that is, the annular sealing part 11, can still be maintained at a compression amount of 30%-45%, so the sealing effect remains unchanged, thereby making the sealing ring provided by the present application have better sealing reliability.

[0022] In one embodiment, the annular mating protrusion 12 is an arc-shaped protrusion, a triangular protrusion or a square protrusion, wherein the arc-shaped protrusion includes a semicircular protrusion.

[0023] Further preferably, the sealing ring 10 is an L-shaped sealing ring, and the sealing ring 10 also has a sleeve portion 13 connected to the inner side of the annular sealing portion 11, and in the thickness direction of the annular sealing portion 11, the sleeve portion 13 protrudes from any of the sealing surfaces by a predetermined distance, and the sleeve portion 13 is flush with another sealing surface, for example, the sleeve portion 13 protrudes from the sealing surface at the top by a predetermined distance, and the sleeve portion 13 is also flush with the sealing surface at the bottom;

[0024] The annular mating protrusion 12 is a semicircular protrusion, and the protruding height of the annular mating protrusion 12 is 0.4-0.65 times the height of the sleeve portion 13 protruding from the sealing surface. Therefore, on the basis of ensuring the sealing effect of the annular sealing portion 11, the annular mating protrusion 12 has a suitable compression deformation range, so that it will not be quickly compressed into place and cannot provide a reasonable relaxation time for the sealing ring 10 when heated, or it will be difficult to be compressed.

[0025] Further preferably, the annular mating protrusion 12 is located in the middle of the sealing surface, and the diameter of the annular mating protrusion 12 is 0.3-0.4 times the single-sided radial dimension of the annular sealing portion 11, so that the annular mating protrusion 12 has a suitable volume size, which can ensure the best sealing effect of the annular sealing portion 11 while meeting the height and radial dimensions. If the height and radial dimensions are both small, it is easy to deform quickly under pressure. If the height and radial dimensions are both large, the sealing ring 10 may not be installed smoothly, or the sealing effect of the sealing ring 10 may be affected when tension is not generated due to heat.

[0026] Combination Figures 1 to 5 The second aspect of the embodiment of the present application provides a battery cover 20, comprising a light cover 21, an explosion-proof valve 22 and two pole assemblies 23, wherein the explosion-proof valve 22 is arranged in the middle of the light cover 21, wherein the two pole assemblies 23 are symmetrically arranged at both ends of the light cover 21 with the explosion-proof valve 22 as the center point, and the bottom of the light cover 21 is provided with a lower plastic 24, wherein the pole assembly 23 includes a pole 25 and the aforementioned sealing ring 10, and the pole 25 is formed by the lower plastic 24. The bottom of the optical cover 21 vertically penetrates the lower plastic 24 and the optical cover 21, and the top of the optical cover 21 is provided with an upper plastic 26 suitable for being sleeved on the column 251 of the pole 25, and the pole 25 also includes a bottom plate 252 coaxially connected to the column 251, wherein the bottom plate 252 abuts against the bottom of the lower plastic 24, and the sealing ring 10 is sleeved on the column 251, and the annular sealing portion 11 is respectively connected to the optical cover 21 and the bottom plate 252 at the top and bottom sides. The various excellent effects of the sealing ring 10 have been described in detail in the previous text, and will not be repeated here.

[0027] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Sealing ring, characterized in that: The sealing ring has an annular sealing portion, and the annular sealing portion has two symmetrical sealing surfaces. The two sealing surfaces are respectively provided with annular matching protrusions near the middle, and the annular matching protrusions are concentrically distributed with the annular sealing portion.

2. The sealing ring according to claim 1, characterized in that: The annular matching protrusion is an arc-shaped protrusion, a triangular protrusion or a square protrusion.

3. The sealing ring according to claim 2, characterized in that: The sealing ring is an L-shaped sealing ring, and the sealing ring further comprises a sleeve portion connected to the inner side of the annular sealing portion, and in the thickness direction of the annular sealing portion, the sleeve portion protrudes from any of the sealing surfaces by a predetermined distance, and the sleeve portion is flush with the other sealing surface; The annular matching protrusion is a semicircular protrusion, and the protruding height of the annular matching protrusion is 0.4-0.65 times the height of the sleeve portion protruding from the sealing surface.

4. The sealing ring according to claim 3, characterized in that: The annular matching protrusion is located in the middle of the sealing surface, and the diameter of the annular matching protrusion is 0.3-0.4 times the radial dimension of a single side of the annular sealing portion.

5. Battery cover, characterized in that: It comprises a light cover, an explosion-proof valve and two pole assemblies, wherein the explosion-proof valve is arranged in the middle of the light cover, and the two pole assemblies are symmetrically arranged at both ends of the light cover with the explosion-proof valve as the center point, and the bottom of the light cover is provided with a lower plastic, and the pole assembly comprises a pole and a sealing ring as described in claim 3 or 4, the pole vertically penetrates the lower plastic and the light cover from the bottom of the lower plastic, and the top of the light cover is provided with an upper plastic suitable for being sleeved on the column of the pole, the pole also comprises a bottom plate coaxially connected to the column, the bottom plate abuts against the bottom of the lower plastic, the sealing ring is sleeved on the column, and the annular sealing part connects the light cover and the bottom plate at the top and bottom sides respectively.

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