CN213043022U

CN213043022U - Annotate liquid hole seal structure and battery

Info

Publication number: CN213043022U
Application number: CN202022228366.8U
Authority: CN
Inventors: 张松山
Original assignee: China Aviation Lithium Battery Research Institute Co Ltd
Current assignee: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd.
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-04-23
Anticipated expiration: 2030-10-09

Abstract

Provided are a liquid injection hole sealing structure and a battery. The liquid injection hole sealing structure comprises a cover plate, a sealing piece and a liquid injection hole; the liquid injection hole is arranged on the cover plate, the sealing element seals the liquid injection hole and comprises a first sealing element and a second sealing element; the liquid injection hole comprises a first liquid injection hole communicated with the outer surface of the cover plate and a second liquid injection hole communicated with the inner surface of the cover plate, the first liquid injection hole is sealed by a first sealing element, and the second liquid injection hole is sealed by a second sealing element; and a cavity is formed by the first sealing element, the second sealing element and the cover plate in a surrounding manner, and the cavity is used for detecting the sealing performance of the sealing structure of the liquid injection hole. The utility model discloses a annotate liquid hole seal structure, because the helium that detects sealing performance can be stored in the cavity, if the sealed not tight helium of first sealing member can reveal through defect department to avoid lou examining. The battery with the sealing structure can avoid safety risks in the long-term use process.

Description

Annotate liquid hole seal structure and battery

Technical Field

The invention belongs to the field of batteries, and particularly relates to a battery, a liquid injection hole sealing structure and a battery comprising the sealing structure.

Background

In the sealing welding process of the lithium ion battery, in order to test the sealing welding effect of the liquid injection hole, helium is generally filled into the battery before packaging, and a sealing rubber nail is pressed to complete the welding of the sealing aluminum nail. And then, placing the whole battery in a negative pressure environment to test the helium concentration for representing the effect of the seal welding.

However, the sealing rubber plug is mostly made of an interference rubber material at the sealing rubber nail part, and the sealing effect is good, so that when the welding position of the sealing aluminum nail and the cover plate has obvious defects, helium leakage cannot be detected by using the helium detection process. In addition, the welding seam defect of the battery which is missed in the post-formation process can cause the safety risk of the battery in the long-term use process. Therefore, it is highly desirable to provide a sealing structure for a liquid filling hole that prevents missing inspection.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned defect, the utility model provides a annotate liquid hole seal structure and contain battery of this seal structure.

The utility model provides a sealing structure of a liquid injection hole on one hand, which comprises a cover plate, a sealing element and a liquid injection hole; the liquid injection hole is formed in the cover plate, the sealing element seals the liquid injection hole, and the sealing element comprises a first sealing element and a second sealing element; the liquid injection hole comprises a first liquid injection hole communicated with the outer surface of the cover plate and a second liquid injection hole communicated with the inner surface of the cover plate, the first liquid injection hole is sealed by a first sealing element, and the second liquid injection hole is sealed by a second sealing element; and a cavity is formed by the first sealing element, the second sealing element and the cover plate in a surrounding manner, and the cavity is used for detecting the sealing performance of the sealing structure of the liquid injection hole.

The utility model discloses another aspect provides a battery including above-mentioned notes liquid hole seal structure.

The utility model discloses a annotate liquid hole seal structure, because the helium that detects sealing performance can be stored in the cavity that first sealing member, second sealing member and apron surround, if the sealed not tight helium of first sealing member can reveal through defect department to avoid lou examining. The battery with the sealing structure can avoid safety risks in the long-term use process.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a sectional view of a liquid injection hole according to an embodiment of the present invention.

Fig. 2A, 2B, 2C, 3A, 3B, and 3C are cross-sectional views of the pour hole sealing structure according to the embodiments of the present invention, respectively.

Fig. 4A is a cross-sectional view of a first seal member according to an embodiment of the present invention.

Fig. 4B is a schematic view of the first seal shown in fig. 4A.

Fig. 5A is a cross-sectional view of a first seal member according to another embodiment of the present invention.

Fig. 5B is a schematic view of the first seal shown in fig. 5A.

Wherein the reference numerals are as follows:

cover plate: 100

Liquid injection hole: 110

First notes liquid hole: 111

A second liquid injection hole: 112

A chamber: 120

Sealing element: 200

A first seal member: 210

A second seal member: 220

And (3) projection: 211

A gas guide groove: 212

Groove: 213

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers are exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.

The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

It should be noted that the terms "upper", "lower", "inside" and "outside" in the present invention are only relative concepts or reference to the normal use status of the product, and should not be considered as limiting. For example, the "inner surface" of the cover plate refers to the surface of the cover plate facing the inside of the battery in the normal use state of the battery; the "outer surface" of the cap plate refers to the surface of the cap plate facing the outside of the battery in the normal use state of the battery.

The utility model discloses a annotate liquid hole seal structure, including apron, sealing member and notes liquid hole. The liquid injection hole is formed in the cover plate, and the sealing piece is used for sealing the liquid injection hole. The seal includes a first seal and a second seal. The liquid injection hole comprises a first liquid injection hole communicated with the outer surface of the cover plate and a second liquid injection hole communicated with the inner surface of the cover plate. The first sealing element, the second sealing element and the cover plate are encircled to form a cavity, and the cavity is used for detecting the sealing performance of the sealing structure of the liquid injection hole. The utility model discloses an annotate among the liquid hole seal structure, a cavity for sealing performance detects forms between first sealing member and second sealing member, if sealed between first sealing member and the apron has the defect, the helium of storage in the cavity can be revealed and detected out from the defect department to can avoid among the prior art because sealed glue nail and annotate the liquid hole sealed effectual and can not detect out whether there is sealed unqualified and lead to the defect of lou examining between sealed aluminium nail and the apron.

The present invention will be described in detail below with reference to the accompanying drawings. As shown in FIG. 1, the pour hole 110 is provided in the lid plate 100. The pour hole 110 may be a stepped hole in the drawing, or may be a hole having another shape. The following embodiments are provided to explain the inventive concept of the present invention by taking a stepped hole as an example, but those skilled in the art will understand that the shape of the liquid injection hole is not limited thereto. Referring to FIG. 1, the pour hole 110 is composed of a first pour hole 111 at the upper portion (communicating with the outer surface of the lid 100) and a second pour hole 112 at the lower portion (communicating with the inner surface of the lid 100). Preferably, the diameter of the first pour hole 111 is larger than the diameter of the second pour hole 112.

In an alternative embodiment, the seal 200 includes a first seal 210 and a second seal 220. The first packing 210 is located in the first pour spout 111, and the second packing 220 is located in the second pour spout 112. The height h of the first sealing member 210 is smaller than the depth d of the first pour hole 110. The height of the second sealing member 220 may be the same as the depth of the second pour hole 112, i.e., as shown in FIG. 2A. The first seal 210, the second seal 220 and the cover plate 100 enclose a chamber 120.

Fig. 2B shows another alternative embodiment, i.e. the second seal 220 may be in contact with the lower surface (the surface facing the chamber 120) of the first seal 210.

Fig. 2C shows yet another alternative embodiment, namely, a groove is provided on the lower surface of the first sealing member 210, and the second sealing member 220 is provided in the groove.

The lower surface of the first sealing member 210 may be further provided with an air guide groove, and the specific structure is shown in fig. 3A, 3B and 3C, respectively. The second seal 220 in fig. 3A, 3B and 3C is the same as the structure in fig. 2A, 2B and 2C, respectively, and the structure will not be described in detail herein. The structure of the first sealing member 210 is explained in detail with reference to fig. 4A, 4B, 5A, and 5B.

As shown in fig. 4A and 4B, the lower surface of the first seal 210 is provided with an air guide groove 212 at the outer periphery thereof. The gas guide groove 212 extends in the direction from the center of the lower surface to the outside, so that the helium gas is guided to flow and then is guided in or out, and the problem of leakage detection caused by slow gas guiding speed when the welding position of the first sealing element leaks slightly is avoided. The air guide groove 212 may be formed by adjacent protrusions 211 disposed at the outer circumference. Air guide slots 212 extend inwardly from the outer periphery of the lower surface.

In an alternative embodiment, as shown in fig. 5A and 5B, the lower surface of the first sealing member 210 may further be provided with a groove 213, the air guide groove 212 is provided at the outer circumference of the lower surface of the first sealing member 210 around the groove 213, and the air guide groove 212 extends from the outer circumference to the sidewall of the groove 213. When sealing, the second sealing member 220 is disposed in the groove 213 to increase the stability of the sealing structure.

The above arrangement of the first sealing member 210 is merely exemplary and is not intended to limit the present invention, and those skilled in the art will appreciate that the first sealing member 210 may be in any other suitable form, for example, the air guide groove may be formed along the center extending from the outer periphery of the lower surface to the inner periphery of the lower surface of the first sealing member.

In the above embodiment, the volume of the first seal 210 is smaller than the volume of the first pour spout 110, and the chamber 120 is formed in the first pour spout 110. It will be understood by those skilled in the art that the chamber 110 may be formed in any other suitable manner, as long as the chamber 110 is surrounded by the first seal 210, the second seal 220 and the cover plate 100. In the above embodiment, the first sealing member 210 may have a regular structure or an irregular structure as long as the chamber 120 can be formed between the first sealing member 210 and the second sealing member 220. The first seal 210 may or may not be in direct contact with the second seal 220.

In the above embodiments, the first sealing member 210 may be a sealing aluminum nail, and the second sealing member 220 may be a sealing rubber nail. The sealing rubber nail is in interference fit with the second liquid injection hole 112 and the groove 213. The sealing aluminum nail can be formed by punching and can also be formed by other modes. The first sealing member 210 and the cap plate 100 are sealed by laser welding, and may be welded by other means.

The utility model also provides a battery of including above-mentioned seal structure.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sealing structure of a liquid injection hole is characterized by comprising a cover plate, a sealing element and the liquid injection hole; the liquid injection hole is formed in the cover plate, the sealing element seals the liquid injection hole, and the sealing element comprises a first sealing element and a second sealing element; the liquid injection hole comprises a first liquid injection hole communicated with the outer surface of the cover plate and a second liquid injection hole communicated with the inner surface of the cover plate, the first liquid injection hole is sealed by a first sealing element, and the second liquid injection hole is sealed by a second sealing element; and a cavity is formed by the first sealing element, the second sealing element and the cover plate in a surrounding manner, and the cavity is used for detecting the sealing performance of the sealing structure of the liquid injection hole.

2. The pour hole sealing structure according to claim 1, characterized in that the first pour hole and the second pour hole constitute a stepped hole.

3. The pour hole sealing structure according to claim 2, characterized in that the aperture of the first pour hole is larger than the aperture of the second pour hole.

4. The pour hole sealing structure according to any one of claims 1 to 3, wherein the first sealing member is connected to the second sealing member.

5. The pour hole sealing structure according to claim 4, wherein a surface of the first sealing member facing the chamber is provided with a groove, and one end of the second sealing member is located in the groove.

6. The liquid filling hole sealing structure according to any one of claims 1 to 3, wherein a surface of the first sealing member facing the chamber is provided with a gas guiding groove for introducing or discharging gas.

7. The pour hole sealing structure according to claim 6, wherein the air-guide groove is provided at an outer periphery of the surface, and the air-guide groove extends inward from the outer periphery of the surface.

8. The pour hole sealing structure according to claim 7, wherein the air-guide groove extends inward from the outer periphery of the surface to the center of the first seal.

9. The pour hole sealing structure according to claim 6, wherein the surface of the first sealing member facing the chamber is provided with a groove, and the air guide groove extends inward from the periphery of the surface to a side wall of the groove.

10. A battery comprising the pour hole sealing structure according to any one of claims 1 to 9.