CN219575903U

CN219575903U - Sealing nail structure of power battery and top cover assembly

Info

Publication number: CN219575903U
Application number: CN202320333615.0U
Authority: CN
Inventors: 王雷; 徐月红; 方仁杰; 邓平华
Original assignee: Jiangxi Baisili New Energy Technology Co ltd
Current assignee: Jiangxi Baisili New Energy Technology Co ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-08-22
Anticipated expiration: 2033-02-28

Abstract

The utility model discloses a power battery sealing nail structure and a top cover assembly, wherein the power battery sealing nail structure comprises a top cover plate, sealing nails and glue nails; the top cover plate is provided with a conical groove matched with the sealing nail and a liquid injection hole matched with the glue nail; the bottom of the liquid injection hole is provided with an annular flange, an annular positioning sealing groove is formed in the annular flange, and an annular convex ring matched with the annular positioning sealing groove is arranged at the lower end of the glue nail. According to the utility model, the annular flange is arranged, the annular positioning sealing groove is formed in the annular flange, the rubber nails are axially positioned through the annular flange, so that the rubber nails can be effectively prevented from falling into the battery, and the metal microparticles and fragments remained on the wall of the liquid injection hole can fall into the annular positioning sealing groove and cannot enter the battery, so that the risk of causing internal short circuit of the battery is reduced, and the use safety of the battery is improved.

Description

Sealing nail structure of power battery and top cover assembly

Technical Field

The utility model relates to the technical field of batteries, in particular to a power battery sealing nail structure and a top cover assembly.

Background

With the development of modern society and the enhancement of environmental awareness of people, more and more devices select lithium batteries as power sources, such as mobile phones, notebook computers, electric tools, electric automobiles and the like, which provides a wide space for the application and development of the lithium batteries. Among them, lithium batteries used in electric tools, electric vehicles, and the like are generally called power batteries.

The power cell generally includes a battery cell, a battery housing containing the battery cell, a top cap assembly sealingly mounted to the battery housing, and an electrolyte poured into the battery housing. The top cover assembly is generally composed of a top cover plate, a positive pole column, a negative pole column and the like, a liquid injection hole is formed in the top cover plate for injecting electrolyte into the battery shell, the existing liquid injection hole structure generally comprises a sinking table and a through hole penetrating through the center of the sinking table, and after liquid injection is completed, a plastic sealing nail is generally required to seal the liquid injection hole.

The current sealant nail is cylindricly, cylindric sealant nail is straight body nail, exists the risk of dropping to in the battery inside to, annotate in the liquid hole reprocessing process, can remain metal micro particles and piece on the pore wall of liquid hole, if not clean up, insert the back when the glue nail, the glue nail can scrape the internal short circuit risk of the inside leading power core of electric core with remaining metal micro particles and piece, very big influence the safety in utilization of electric core.

Disclosure of Invention

The utility model aims to solve the problems that: the utility model provides a power battery sealing nail structure and top cap subassembly, through setting up annular flange, and set up annular location seal groove on annular flange, carry out axial positioning to the rubber nail through annular flange, can prevent effectively that the rubber nail from dropping to inside the battery, and, residual metal micro particles and piece can fall in the annular location seal groove on the pore wall of annotating the liquid hole, and can not enter into inside the battery, reduced the risk of causing the internal short circuit of battery, consequently improved the safety in utilization of battery.

The technical scheme provided by the utility model for solving the problems is as follows: a power battery sealing nail structure comprises a top cover plate, sealing nails and glue nails; the top cover plate is provided with a conical groove matched with the sealing nail and a liquid injection hole matched with the glue nail;

the bottom of the liquid injection hole is provided with an annular flange, an annular positioning sealing groove is formed in the annular flange, and an annular convex ring matched with the annular positioning sealing groove is arranged at the lower end of the glue nail.

Preferably, the lower end face of the sealing nail is provided with a boss matched with the upper end face of the glue nail for positioning.

Preferably, the diameter of the boss is smaller than the diameter of the liquid injection hole.

Preferably, the lower end of the sealing nail is a conical head.

Preferably, the top cover sheet is provided with a stress relief groove surrounding the tapered groove.

The utility model also discloses a top cover assembly, which comprises the power battery sealing nail structure.

Preferably, the device further comprises a negative pole column assembly, a positive pole column assembly and an explosion-proof valve assembly.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the annular flange is arranged, the annular positioning sealing groove is formed in the annular flange, the rubber nails are axially positioned through the annular flange, so that the rubber nails can be effectively prevented from falling into the battery, and metal microparticles and fragments remained on the wall of the liquid injection hole can fall into the annular positioning sealing groove and cannot enter the battery, so that the risk of causing internal short circuit of the battery is reduced, and the use safety of the battery is improved; moreover, the sealing effect of the glue nail is further improved through the cooperation of the annular convex ring and the annular positioning sealing groove.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model.

FIG. 1 is a schematic view of the overall structure of the cap assembly of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is a cross-sectional view of the present utility model;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

the drawings are marked: 1. the anti-explosion valve comprises a top cover plate, 2, an anti-explosion valve assembly, 3, a positive pole column assembly, 4, a stress relief groove, 5, a sealing nail, 6, a negative pole column assembly, 7, a glue nail, 8, a liquid injection hole, 9, a boss, 10, an annular convex ring, 11, a conical head, 12, an annular flange, 13, a conical groove, 14 and an annular positioning sealing groove.

Detailed Description

The following detailed description of embodiments of the present utility model will be given with reference to the accompanying drawings and examples, by which the implementation process of how the present utility model can be applied to solve the technical problems and achieve the technical effects can be fully understood and implemented.

In the description of the present utility model, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present utility model that the device or element referred to must have a specific azimuth configuration and operation.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first", "a second" or "a second" feature may explicitly or implicitly include one or more such feature, and in the description of the utility model, the meaning of "a number" is two or more, unless otherwise specifically defined.

In the present utility model, unless explicitly stated and limited otherwise, the terms "assembled," "connected," and "connected" are to be construed broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; can be directly connected or connected through an intermediate medium, and can be communicated with the inside of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the embodiments of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the utility model. As used in the specification of the embodiments of the utility model and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Example 1

A power battery sealing nail structure comprises a top cover plate 1, a sealing nail 5 and a glue nail 7; the top cover sheet 1 is provided with a conical groove 13 matched with the sealing nail 5 and a liquid injection hole 8 matched with the glue nail 7;

the bottom of the liquid injection hole 8 is provided with an annular flange 12, the annular flange 12 is provided with an annular positioning sealing groove 14, and the lower end of the glue nail 7 is provided with an annular convex ring 10 matched with the annular positioning sealing groove 14.

In the scheme, the annular flange is arranged, the annular positioning sealing groove is formed in the annular flange, the rubber nails are axially positioned through the annular flange, the rubber nails can be effectively prevented from falling into the battery, and metal microparticles and fragments remained on the hole wall of the liquid injection hole can fall into the annular positioning sealing groove and cannot enter the battery, so that the risk of causing internal short circuit of the battery is reduced, and the use safety of the battery is improved; in this scheme, annular bulge loop and glues the nail as integrated into one piece, and the material of gluey nail and annular bulge loop is the same promptly, and annular bulge loop can provide sealed effect the same with the sealing washer when receiving external force extrusion, and this scheme has further promoted the sealed effect of gluey nail through annular bulge loop and annular location seal groove cooperation.

In this embodiment, a boss 9 that is matched with the upper end face of the glue nail 7 for positioning is provided on the lower end face of the sealing nail 5, and further, the diameter of the boss 9 is smaller than that of the liquid injection hole 8.

In the scheme, the axial positioning of the glue nail is realized through the boss and the annular flange, the glue nail is prevented from moving up and down in the positioning hole (the sealing performance of the glue nail can be reduced due to the up-down movement) caused by the change of the internal pressure of the battery, and the sealing effect of the glue nail is improved. When the sealing nail is welded, the device is adopted to apply pressure in the vertical direction to the sealing nail, so that a certain pretightening force is applied to the glue nail by the boss of the sealing nail, and then the welding is carried out.

In this embodiment, for convenience of inserting the sealing nail into the liquid injection hole, the lower end of the sealing nail 5 is a conical head 11.

In the prior art, there are problems that welding cracks are easily generated due to large welding stress of the sealing nails, and electrolyte overflows and easily pollutes the explosion-proof valve in the negative pressure formation process, in the scheme, a stress relief groove 4 surrounding the conical groove 13 is arranged on the top cover sheet 1. The stress eliminating groove 4 can offset the stress of the sealing nail in the welding process to a great extent, so that the risk of welding cracks caused by overlarge stress in the welding process is reduced; on the other hand, the stress relieving groove 4 can collect electrolyte overflowed in the negative pressure formation process, so that the electrolyte is prevented from polluting the explosion-proof valve.

Example 2

As shown in fig. 1, the present embodiment discloses a top cap assembly including a power cell sealing pin structure as described in embodiment 1. Still include negative pole post assembly 6, anodal post assembly 3 and explosion-proof valve assembly 2, in this embodiment, it should be noted that, the other structural parts of top cap subassembly belongs to prior art, and the skilled person can design as required, just need not be repeated in this embodiment.

The foregoing is illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the claims. The present utility model is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The utility model provides a power battery sealing nail structure, includes top cover sheet (1), sealing nail (5) and glued nail (7); the method is characterized in that: a conical groove (13) matched with the sealing nail (5) and a liquid injection hole (8) matched with the glue nail (7) are formed in the top cover sheet (1);

the bottom of the liquid injection hole (8) is provided with an annular flange (12), an annular positioning sealing groove (14) is formed in the annular flange (12), and an annular convex ring (10) matched with the annular positioning sealing groove (14) is arranged at the lower end of the glue nail (7).

2. The power cell sealing pin structure according to claim 1, wherein: the lower end face of the sealing nail (5) is provided with a boss (9) matched with the upper end face of the glue nail (7) for positioning.

3. The power cell sealing pin structure according to claim 2, wherein: the diameter of the boss (9) is smaller than that of the liquid injection hole (8).

4. The power cell sealing pin structure according to claim 1, wherein: the lower end of the sealing nail (5) is provided with a conical head (11).

5. The power cell sealing pin structure according to claim 1, wherein: the top cover sheet (1) is provided with a stress relief groove (4) surrounding the conical groove (13).

6. A top cap subassembly, characterized in that: a power cell seal pin structure comprising any one of claims 1-5.

7. The header assembly of claim 6, wherein: the anti-explosion valve further comprises a negative pole column assembly (6), a positive pole column assembly (3) and an anti-explosion valve assembly (2).