CN219739129U - Waterproof structure of battery pack - Google Patents

Abstract

The utility model discloses a waterproof structure of a battery pack, which belongs to the technical field of batteries and comprises an upper shell, a lower shell and a waterproof mechanism, wherein the upper shell comprises a first shell, a plug hole and a clamping part, wherein the plug hole and the clamping part are arranged in the first shell, and the clamping part is positioned in the plug hole; the lower shell comprises a second shell and a conductive piece arranged on the second shell, wherein the conductive piece at least comprises a body, a first clamping groove and a second clamping groove which are arranged on the body, and the first clamping groove is clamped with the clamping component; the waterproof mechanism comprises a first elastic sealing piece and a second elastic sealing piece, the first elastic sealing piece is arranged in the second clamping groove, and the first elastic sealing piece is positioned in the inserting hole; the second elastic sealing piece is sleeved on the body, the second elastic sealing piece is abutted to the first shell, and the first elastic sealing piece is located between the second elastic sealing piece and the first clamping groove. The utility model achieves the technical effects of improving poor sealing effect and improving convenience of assembly.

Description

Waterproof structure of battery pack

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a waterproof structure of a battery pack.

Background

In the use process of electronic products such as battery packs and the like, the electronic products need to have good waterproof and dustproof performances, and the functions and the use safety of the battery packs can be influenced by the strength of the waterproof functions. If the waterproof grade of the battery product is low, water can easily enter, so that the reliability of the battery in the use process is low.

At present, in the battery technology, reserved gaps are adopted for glue spraying and water proofing, or the effects of sealing, water proofing and dust proofing are achieved through integral injection molding. However, in the process of gluing and waterproofing, the glue amount is difficult to control, the glue curing time is long, the residual glue is difficult to clean, the subsequent maintenance is difficult, and the like. If an integral injection molding mode is adopted, the problems of high die cost, low production efficiency, high reject ratio and the like are caused. In addition, after integral injection molding, the conductive piece is fixed on the upper shell, and the problem that the wire length needs to be reserved in the inside, so that the assembly is difficult and interference is easy is also derived.

In summary, in the conventional battery technology, there is a technical problem that the sealing effect is poor and the convenience of assembly is low.

Disclosure of Invention

The utility model aims to solve the technical problems of poor sealing effect and low assembly convenience.

In order to solve the technical problems, the present utility model provides a waterproof structure of a battery pack, the waterproof structure of the battery pack comprising: the waterproof device comprises an upper shell, a lower shell and a waterproof mechanism, wherein the upper shell comprises a first shell, a plug hole and a clamping part, the plug hole and the clamping part are arranged in the first shell, and the clamping part is positioned in the plug hole; the lower shell comprises a second shell body and a conductive piece arranged on the second shell body, wherein the conductive piece at least comprises a body, a first clamping groove and a second clamping groove which are arranged on the body, and the first clamping groove is clamped with the clamping component; the waterproof mechanism comprises a first elastic sealing piece and a second elastic sealing piece, the first elastic sealing piece is arranged in the second clamping groove, and the first elastic sealing piece is positioned in the inserting hole; the second elastic sealing piece is sleeved on the body, the second elastic sealing piece is abutted to the first shell, and the first elastic sealing piece is located between the second elastic sealing piece and the first clamping groove.

Optionally, the upper case further includes: the isolation plate is arranged on the first shell, the isolation plate extends towards the direction close to the second shell, the isolation plate is enclosed to form the plug hole, the clamping component is connected with the isolation plate, the first elastic sealing piece is abutted to the isolation plate, and the second elastic sealing piece is abutted to the isolation plate.

Optionally, the insertion hole is circular, the second elastic sealing element is circular, and the diameter of the insertion hole is larger than that of the second elastic sealing element.

Optionally, the clamping component includes: the first clamping connector and the second clamping connector are arranged at one end of the first clamping connector, and the other end of the first clamping connector is clamped with the first clamping groove; one end of the second clamping connector is arranged on the first shell, the other end of the second clamping connector is clamped with the first clamping groove, and the other end of the first clamping connector and the other end of the second clamping connector are symmetrically distributed relative to the body.

Optionally, the other end of the first clamping connector comprises a first clamping end for being clamped with the first clamping groove and a first limiting surface arranged at the first clamping end, and the first limiting surface extends along a direction perpendicular to the body; the other end of the second clamping connector comprises a second clamping end and a second limiting surface, wherein the second clamping end is used for being clamped with the first clamping groove, the second limiting surface is arranged at the second clamping end, and the second limiting surface extends along the direction perpendicular to the body.

Optionally, a distance between the first clamping end and the second clamping end is smaller than a diameter of the body.

Optionally, the first clamping groove is in a ring shape, and the second clamping groove is in a ring shape.

Optionally, the conductive member further includes a boss fixed to the body, the boss being connected to the second elastic seal, the second elastic seal being located between the boss and the first housing.

Optionally, the protruding portion is circular, and the diameter of protruding portion is greater than the diameter of spliced eye.

Optionally, the second elastic sealing member is a silicone gasket, and the diameter of the second elastic sealing member is larger than that of the first elastic sealing member.

The beneficial effects are that:

the utility model provides a waterproof structure of a battery pack, which is characterized in that a first clamping groove of a conductive piece in a second shell is clamped with a clamping part in a splicing hole in an upper shell, a first elastic sealing piece in a waterproof mechanism is arranged in a second clamping groove on a body in the conductive piece, the first elastic sealing piece is positioned in the splicing hole of the first shell, the second elastic sealing piece is sleeved on the body of the conductive piece, the second elastic sealing piece is mutually abutted with the first shell, and the first elastic sealing piece is positioned between the second elastic sealing piece and the first clamping groove of the body in the conductive piece. When assembling like this, the conductive part of inferior valve can insert in the spliced eye of epitheca after epitheca and inferior valve are counterpoint, and joint part can with conductive part looks joint this moment, with epitheca and inferior valve lock each other, can prevent that non-professional from unpacking privately. Meanwhile, the first elastic sealing piece is pressed in the inserting hole, and the second elastic sealing piece is pressed with the first shell, so that the dual waterproof effect is realized. And then the inner sealing space formed by the upper shell and the lower shell can provide a better sealing effect for the battery pack, and the convenience of assembly is improved. Thereby reached and improved sealed effect poor, promoted the technological effect of the convenience of assembly.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a waterproof structure of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a conductive member in a waterproof structure of a battery pack according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a plugging hole in a waterproof structure of a battery pack according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a plugging hole in a waterproof structure of a battery pack according to an embodiment of the present utility model.

Detailed Description

The utility model discloses a waterproof structure of a battery pack, which is characterized in that a first clamping groove 222 of a conductive piece 22 in a second shell 21 is clamped with a clamping part 13 in a plug hole 12 in an upper shell 1, a first elastic sealing piece 31 in a waterproof mechanism is arranged in a second clamping groove 223 on a body 221 in the conductive piece 22, the first elastic sealing piece 31 is positioned in the plug hole 12 of a first shell 11, a second elastic sealing piece 32 is sleeved on the body 221 of the conductive piece 22, the second elastic sealing piece 32 is mutually abutted with the first shell 11, and the first elastic sealing piece 31 is positioned between the second elastic sealing piece 32 and the first clamping groove 222 of the body 221 in the conductive piece 22. Therefore, when the upper shell 1 and the lower shell 2 are assembled, the conductive piece 22 of the lower shell 2 is inserted into the inserting hole 12 of the upper shell 1, and the clamping component 13 is clamped with the conductive piece 22, so that the upper shell 1 and the lower shell 2 are buckled with each other, and the non-professional personnel can be prevented from disassembling privately. Meanwhile, the first elastic sealing piece 31 is pressed in the plug hole 12, and the second elastic sealing piece 32 is pressed with the first shell 11, so that a double waterproof effect is achieved. The inner sealed space formed by the upper case 1 and the lower case 2 can then provide a good sealing effect for the battery pack, and the convenience of assembly is improved. Thereby reached and improved sealed effect poor, promoted the technological effect of the convenience of assembly.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present utility model are within the scope of the present utility model; wherein reference to "and/or" in this embodiment indicates and/or two cases, in other words, reference to a and/or B in the embodiments of the present utility model indicates two cases of a and B, A or B, and describes three states in which a and B exist, such as a and/or B, and indicates: only A and not B; only B and not A; includes A and B.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. Spatially relative terms, such as "below," "above," and the like, may be used herein to facilitate a description of one element or feature's relationship to another element or feature. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" would then be oriented "on" other elements or features. Thus, the exemplary term "below" may include both above and below orientations. The device may be oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Also, in embodiments of the present utility model, when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and the like are used in the embodiments of the present utility model for illustrative purposes only and are not intended to limit the present utility model.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic structural diagram of a waterproof structure of a battery pack according to an embodiment of the present utility model, fig. 2 is a schematic structural diagram of a conductive member 22 in the waterproof structure of the battery pack according to an embodiment of the present utility model, fig. 3 is a schematic structural diagram of a plug hole 12 in the waterproof structure of the battery pack according to an embodiment of the present utility model, and fig. 4 is a schematic structural diagram of a plug hole 12 in the waterproof structure of the battery pack according to an embodiment of the present utility model. The embodiment of the utility model provides a waterproof structure of a battery pack, which comprises an upper shell 1, a lower shell 2 and a waterproof mechanism, wherein the upper shell 1, the lower shell 2 and the waterproof mechanism are respectively described in detail below:

for the upper case 1:

the upper shell 1 comprises a first shell 11, a plug hole 12 and a clamping component 13, wherein the plug hole 12 is arranged in the first shell 11, and the clamping component 13 is positioned in the plug hole 12. The upper shell 1 further comprises a separation plate 14 arranged on the first shell 11, the separation plate 14 extends towards the direction close to the second shell 21, the separation plate 14 surrounds the plug hole 12, the clamping component 13 is connected with the separation plate 14, the first elastic sealing piece 31 is in mutual abutting connection with the separation plate 14, and the second elastic sealing piece 32 is in mutual abutting connection with the separation plate 14. The insertion hole 12 is circular, the second elastic sealing member 32 is circular, and the diameter of the insertion hole 12 is larger than that of the second elastic sealing member 32. The clamping component 13 comprises a first clamping connector 131 and a second clamping connector 132, one end of the first clamping connector 131 is mounted on the first shell 11, and the other end of the first clamping connector 131 is clamped with the first clamping groove 222; one end of the second clamping connector 132 is mounted on the first housing 11, the other end of the second clamping connector 132 is clamped with the first clamping groove 222, and the other ends of the first clamping connector 131 and the second clamping connector 132 are symmetrically distributed relative to the body 221. The other end of the first clamping connector 131 includes a first clamping end 1311 for mutually clamping with the first clamping groove 222, and a first limiting surface 1312 disposed on the first clamping end 1311, where the first limiting surface 1312 extends along a direction perpendicular to the body 221; the other end of the second clamping connector 132 includes a second clamping end 1321 for clamping with the first clamping groove 222, and a second limiting surface 1322 disposed on the second clamping end 1321, where the second limiting surface 1322 extends along a direction perpendicular to the body 221. The distance between the first clamping end 1311 and the second clamping end 1321 is smaller than the diameter of the body 221, so that the first clamping end 1311 and the second clamping end 1321 are clamped into the first clamping groove 222 from two sides of the body 221.

Specifically, the upper case 1 may include a first case 11, a socket hole 12, and a clamping member 13, wherein a first clamping connector 131 and a second clamping connector 132 of the clamping member 13 are installed in the socket hole 12, and a space for accommodating the conductive member 22, the first elastic sealing member 31, the first clamping connector 131, and the second clamping connector 132 is provided inside the socket hole 12. The isolation plate 14 which is in a circular ring shape is fixedly arranged on one side, close to the second shell 21, of the first shell 11, the isolation plate 14 is surrounded to form the plug hole 12, the first clamping connector 131 and the second clamping connector 132 are all arranged on the isolation plate 14, the first shell 11, the isolation plate 14, the first clamping connector 131 and the second clamping connector 132 can be integrally formed, the first clamping connector 131 and the second clamping connector 132 are made of elastic materials, one end, close to the first clamping groove 222, of the first clamping connector 131 can be integrally in a hook shape, and the first clamping connector 131 and the first clamping groove 222 of the second shell 21 are mutually clamped. The end of the first clamping connector 131 near the first clamping groove 222 may include a first clamping end 1311 and a first limiting surface 1312, where the first limiting surface 1312 is located at the top of the first clamping end 1311, as shown in fig. 2, when viewed from a direction perpendicular to the second housing 21, the first clamping groove 222 may be in a ring shape, and a top side surface and a bottom side surface inside the first clamping groove 222 may be parallel to each other, for example, the top side surface and the bottom side surface may both be horizontal, i.e., the top side surface and the bottom side surface are both perpendicular to the body 221, and the second limiting surface 1322 extends along a direction perpendicular to the body 221 to mean that the first limiting surface 1312 may be parallel to the top side surface. After the first clamping end 1311 of the first clamping connector 131 is embedded into the first clamping groove 222, the second elastic sealing element 32 is pressed to deform to form an upward force, so that the first limiting surface 1312 and the top side surface are pushed to be clamped mutually for limiting, the first clamping connector 131 can be prevented from falling from the first clamping groove 222, and the firmness of the mutual clamping between the first clamping connector 131 and the first clamping groove 222 is improved. Since the second locking tab 132 has the same structure and principle as the first locking tab 131, it will not be described here. After the upper shell 1 and the lower shell 2 are aligned during assembly, the first clamping groove 222 can be clamped into the first clamping connector 131 and the second clamping connector 132 respectively to complete primary assembly, so that non-professional personnel can be prevented from disassembling the assembly privately. Then, the first housing 11 of the upper housing 1 and the first housing 11 of the lower housing 2 are fixedly mounted by bolts.

For the lower case 2:

the lower shell 2 comprises a second shell 21 and a conductive piece 22 arranged on the second shell 21, wherein the conductive piece 22 at least comprises a body 221, a first clamping groove 222 and a second clamping groove 223 which are arranged on the body 221, and the first clamping groove 222 is mutually clamped with the clamping component 13; the first clamping groove 222 is in a circular ring shape, and the second clamping groove 223 is in a circular ring shape. The conductive member 22 further includes a boss 224 fixed to the body 221, the boss 224 is connected to the second elastic sealing member 32, and the second elastic sealing member 32 is located between the boss 224 and the first housing 11. The protruding portion 224 may have a circular shape, and the diameter of the protruding portion 224 may be larger than the diameter of the insertion hole 12.

Specifically, the body 221 of the conductive member 22 is sequentially provided with a protruding portion 224, a second clamping groove 223 and a first clamping groove 222 from bottom to top, the protruding portion 224 is used for supporting the second elastic sealing member 32, the second elastic sealing member 32 is sleeved on the body 221, two sides of the second elastic sealing member 32 are respectively contacted with the protruding portion 224 and the isolation plate 14 located in the first shell 11, and the second elastic sealing member 32 is pressed by the protruding portion 224 and the isolation plate 14, so that sealing, water prevention and dust prevention are achieved. The second clamping groove 223 is used for installing the first elastic sealing element 31, the diameter of the first elastic sealing element 31 is larger than that of the second clamping groove 223, after the first elastic sealing element 31 is embedded into the second clamping groove 223, the position, located outside the second clamping groove 223, of the first elastic sealing element 31 can be mutually pressed with the isolation plate 14 located on the first shell 11, namely, the first elastic sealing element 31 and the inner wall of the plug hole 12 are mutually pressed, and sealing, water prevention and dust prevention can be realized. The first clamping groove 222 is used for being clamped with the first clamping connector 131, the first clamping groove 222 is used for being clamped with the second clamping connector 132, when the upper shell 1 and the lower shell 2 are mutually close to each other and buckled, the first clamping connector 131 and the second clamping connector 132 are respectively clamped into the first clamping groove 222, and the first clamping connector 131 and the second clamping connector 132 are mutually clamped from two sides of the body 221 in the conductive piece 22. In addition, through the grafting mode of the grafting hole 12 and the conductive piece 22 in the upper shell 1, the problems that the internal patch cord is difficult to arrange and easy to interfere caused by overlong design can be avoided, and the convenience of direct assembly of the upper shell 1 and the lower shell 2 is improved.

For a waterproof mechanism:

the waterproof mechanism comprises a first elastic sealing element 31 and a second elastic sealing element 32, the first elastic sealing element 31 is installed in the second clamping groove 223, and the first elastic sealing element 31 is positioned in the plug hole 12; the second elastic sealing member 32 is sleeved on the body 221, the second elastic sealing member 32 and the first housing 11 are abutted to each other, and the first elastic sealing member 31 is located between the second elastic sealing member 32 and the first clamping groove 222. The second elastic sealing member 32 is a silicone gasket, and the diameter of the second elastic sealing member 32 may be larger than that of the first elastic sealing member 31.

Specifically, the first elastic sealing element 31 may refer to a waterproof O-ring, the second elastic sealing element 32 may refer to a silica gel waterproof gasket, a part of the first elastic sealing element 31 is embedded into the second clamping groove 223, another part of the first elastic sealing element 31 is located outside the second clamping groove 223, and another part of the first elastic sealing element 31 may fill a gap between the body 221 of the conductive element 22 and the inner wall of the plugging hole 12, so as to seal, waterproof and dustproof between the second clamping groove 223 and the inner wall of the plugging hole 12. The second elastic sealing element 32 is sleeved on the body 221 of the conductive element 22, the second elastic sealing element 32 is located between the protruding portion 224 arranged on the body 221 and the isolation plate 14 arranged on the first shell 11, after the first clamping connector 131 and the second clamping connector 132 are clamped into the first clamping groove 222, the protruding portion 224 arranged on the body 221 and the isolation plate 14 arranged on the first shell 11 can be compressed from the upper side and the lower side of the second elastic sealing element 32, and sealing, waterproofing and dust prevention can be achieved after the second elastic sealing element 32 is compressed, so that the dual waterproof effect is achieved.

The utility model provides a waterproof structure of a battery pack, which is characterized in that a first clamping groove 222 of a conductive piece 22 in a second shell 21 is clamped with a clamping part 13 in a plug hole 12 in an upper shell 1, a first elastic sealing piece 31 in a waterproof mechanism is arranged in a second clamping groove 223 on a body 221 in the conductive piece 22, the first elastic sealing piece 31 is positioned in the plug hole 12 of a first shell 11, a second elastic sealing piece 32 is sleeved on the body 221 of the conductive piece 22, the second elastic sealing piece 32 is mutually abutted with the first shell 11, and the first elastic sealing piece 31 is positioned between the second elastic sealing piece 32 and the first clamping groove 222 of the body 221 in the conductive piece 22. Therefore, when the upper shell 1 and the lower shell 2 are assembled, the conductive piece 22 of the lower shell 2 is inserted into the inserting hole 12 of the upper shell 1, and the clamping component 13 is clamped with the conductive piece 22, so that the upper shell 1 and the lower shell 2 are buckled with each other, and the non-professional personnel can be prevented from disassembling privately. Meanwhile, the first elastic sealing piece 31 is pressed in the plug hole 12, and the second elastic sealing piece 32 is pressed with the first shell 11, so that a double waterproof effect is achieved. The inner sealed space formed by the upper case 1 and the lower case 2 can then provide a good sealing effect for the battery pack, and the convenience of assembly is improved. Thereby reached and improved sealed effect poor, promoted the technological effect of the convenience of assembly.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same, and although the present utility model has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.

Claims (10)

1. A waterproof structure of a battery pack, characterized in that the waterproof structure of a battery pack comprises: the waterproof device comprises an upper shell, a lower shell and a waterproof mechanism, wherein the upper shell comprises a first shell, a plug hole and a clamping part, the plug hole and the clamping part are arranged in the first shell, and the clamping part is positioned in the plug hole; the lower shell comprises a second shell body and a conductive piece arranged on the second shell body, wherein the conductive piece at least comprises a body, a first clamping groove and a second clamping groove which are arranged on the body, and the first clamping groove is clamped with the clamping component; the waterproof mechanism comprises a first elastic sealing piece and a second elastic sealing piece, the first elastic sealing piece is arranged in the second clamping groove, and the first elastic sealing piece is positioned in the inserting hole; the second elastic sealing piece is sleeved on the body, the second elastic sealing piece is abutted to the first shell, and the first elastic sealing piece is located between the second elastic sealing piece and the first clamping groove.

2. The waterproof structure of a battery pack according to claim 1, wherein the upper case further comprises: the isolation plate is arranged on the first shell, the isolation plate extends towards the direction close to the second shell, the isolation plate is enclosed to form the plug hole, the clamping component is connected with the isolation plate, the first elastic sealing piece is abutted to the isolation plate, and the second elastic sealing piece is abutted to the isolation plate.

3. The waterproof structure of a battery pack according to claim 1, wherein: the plug hole is circular, the second elastic sealing piece is circular, and the diameter of the plug hole is larger than that of the second elastic sealing piece.

4. The waterproof structure of a battery pack according to claim 1, wherein the clamping member comprises: the first clamping connector and the second clamping connector are arranged at one end of the first clamping connector, and the other end of the first clamping connector is clamped with the first clamping groove; one end of the second clamping connector is arranged on the first shell, the other end of the second clamping connector is clamped with the first clamping groove, and the other end of the first clamping connector and the other end of the second clamping connector are symmetrically distributed relative to the body.

5. The waterproof structure of a battery pack according to claim 4, wherein: the other end of the first clamping connector comprises a first clamping end and a first limiting surface, wherein the first clamping end is used for being clamped with the first clamping groove, the first limiting surface is arranged at the first clamping end, and the first limiting surface extends along the direction perpendicular to the body; the other end of the second clamping connector comprises a second clamping end and a second limiting surface, wherein the second clamping end is used for being clamped with the first clamping groove, the second limiting surface is arranged at the second clamping end, and the second limiting surface extends along the direction perpendicular to the body.

6. The waterproof structure of a battery pack according to claim 5, wherein: the distance between the first clamping end and the second clamping end is smaller than the diameter of the body.

7. The waterproof structure of a battery pack according to claim 1, wherein: the first clamping groove is in a circular ring shape, and the second clamping groove is in a circular ring shape.

8. The waterproof structure of a battery pack according to claim 1, wherein: the conductive member further comprises a protruding portion fixed to the body, the protruding portion is connected with the second elastic sealing member, and the second elastic sealing member is located between the protruding portion and the first shell.

9. The waterproof structure of a battery pack according to claim 8, wherein: the protruding portion is circular, and the diameter of the protruding portion is larger than that of the inserting hole.

10. The waterproof structure of a battery pack according to claim 8, wherein: the second elastic sealing piece is a silica gel gasket, and the diameter of the second elastic sealing piece is larger than that of the first elastic sealing piece.