CN210926145U

CN210926145U - Lithium ion battery and liquid injection hole plugging structure thereof

Info

Publication number: CN210926145U
Application number: CN201920940544.4U
Authority: CN
Inventors: 娄豫皖; 许玉林; 王爱淑; 甘凯歌; 张朋; 张瑞; 印杏莲
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-07-03
Anticipated expiration: 2029-06-21

Abstract

The application discloses lithium ion battery and annotate liquid hole block structure thereof, lithium ion battery includes: the battery comprises a battery shell with an opening, an inner core contained in the battery shell and a battery cap for closing and fixing the opening of the battery shell; the battery shell or the battery cap is provided with a liquid injection hole for injecting electrolyte into the battery shell; the liquid injection hole is a through hole extending in a curve, and a plastic ball and a steel ball which are used for sealing the liquid injection hole are filled in the liquid injection hole. This kind of lithium ion battery annotates liquid hole block structure easy to carry out of this application, and the structure is firm to can guarantee the smooth discharge of the internal gas after the battery formation in the shutoff process.

Description

Lithium ion battery and liquid injection hole plugging structure thereof

Technical Field

The application relates to a lithium ion battery and a liquid injection hole plugging structure thereof.

Background

In the manufacturing process of the lithium ion battery, electrolyte for soaking the electrode group (inner core) needs to be filled into the battery, so that a liquid filling hole needs to be formed in the battery, the electrolyte is filled into the battery from the liquid filling hole, and the liquid filling hole is plugged by a rubber plug inserted into the liquid filling hole. However, the diameter of the liquid injection hole of the battery is small, and the rubber plug is difficult to insert. In addition, the existing liquid injection holes are all straight-line holes, sealing elements which are punched into the holes are easy to fall into the battery,

disclosure of Invention

The purpose of the application is: in order to solve the problems, the lithium ion battery and the liquid injection hole plugging structure thereof are provided, the structure is simple and stable, the implementation is easy, and the smooth discharge of internal gas after the battery formation can be ensured in the plugging process.

The technical scheme of the application is as follows:

a lithium ion battery comprising:

a battery case having an opening part,

an inner core accommodated in the battery case, and

a battery cap for sealing and fixing the opening part of the battery case;

the battery shell or the battery cap is provided with a liquid injection hole for injecting electrolyte into the battery shell;

the liquid injection hole is a through hole extending in a curve, and a plastic ball and a steel ball which are used for sealing the liquid injection hole are filled in the liquid injection hole.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the plastic balls and the steel balls are arranged at intervals or in a leaning manner along the length direction of the liquid injection hole, and the plastic balls are positioned on the inner side of the steel balls.

The plastic ball is made of ethylene propylene diene monomer.

The plastic ball is made of PP materials.

The plastic ball is made of PE materials.

The liquid injection hole is arranged in a Z shape in an extending manner.

The liquid injection hole is formed in the battery cap.

The liquid injection hole is a round hole.

The lithium ion battery is a cylindrical battery, the battery shell is of a cylindrical structure, and the battery cap is arranged at the axial end part of the battery shell.

The utility model provides a lithium ion battery annotates liquid hole block structure, is including annotating the liquid hole, annotate the through-hole that the liquid hole is the curve extension, and annotate the downthehole stopper of liquid and have filled plastic ball and the steel ball that blocks up this notes liquid hole.

The application has the advantages that: this application will annotate the liquid hole and change into crooked hole to utilize the plastics ball and the shutoff of mutually supporting to annotate the liquid hole, the plastics ball of squeezing into in earlier stage has the plastic deformation ability, can guarantee the gaseous smooth discharge in the back of the battery formation, and the steel ball of squeezing into in later stage will annotate the liquid hole crooked sealed, prevents inside foreign matter or the gaseous battery that gets into. Compare in the plug, the liquid hole is annotated to the easier punching of the plastic ball of this application, and the liquid hole greatly reduced that annotates of curve extension has moreover the probability that the plastic ball falls into the battery inside.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a lithium ion battery injection hole ready for being punched with a plastic ball according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a lithium ion battery injection hole ready for steel ball injection in the embodiment of the present application;

FIG. 3 is a schematic diagram of a lithium ion battery after a steel ball is driven into a liquid injection hole in the embodiment of the present application;

wherein: 1-battery cap, 2-liquid injection hole, 3-plastic ball and 4-steel ball.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Fig. 1 to 3 show a preferred embodiment of the lithium ion battery electrolyte injection hole blocking structure of the present application, which includes an electrolyte injection hole 2 for injecting electrolyte into the battery, and the electrolyte injection hole 2 is specifically opened on a battery cap 1 of a cylindrical lithium ion battery. Specifically, the cylindrical lithium ion battery includes a cylindrical battery case (not shown in the figure), one axial end of the battery case is open, the other axial end of the battery case is closed and provided with a bottom, a battery cap 1 is closed and fixed at the opening of the battery case, and an inner core formed by winding positive and negative pole pieces and a diaphragm is arranged in the battery case. Electrolyte is poured into the battery shell through the liquid injection hole 2, and the inner core inside is soaked by the electrolyte, so that the inner core has electricity generating capacity.

The key improvement of the embodiment is that the liquid filling hole 2 is a through hole extending in a curve (not a straight line), and the liquid filling hole 2 is plugged with a plastic ball 3 and a steel ball 4 for plugging the liquid filling hole.

In practical application, after sufficient electrolyte is injected into the battery through the liquid injection hole 2, the flexible plastic ball 3 is driven into the liquid injection hole 2, on one hand, the plastic ball 3 driven into the liquid injection hole can prevent moisture in the air from entering the battery, on the other hand, gas generated in the battery after formation can be released to the outside of the battery, and the plastic ball 3 has flexible deformation capacity and can deform under the action of high air pressure to release the gas. After the battery formation is finished and the internal gas is discharged, the steel ball 4 is punched into the liquid injection hole 2, and the liquid injection hole 2 is completely sealed and blocked by the steel ball 4.

It can be seen that the plastic balls 3 and the steel balls 4 are driven into the injection hole 2 in two stages, so that the plastic balls 3 and the steel balls 4 are spaced or closely arranged along the length direction of the injection hole 2, and the plastic ball 3 which is driven first is positioned at the inner side of the steel ball 4 which is driven later. The "inner side" refers to a side close to the inside of the battery.

The liquid injection hole 2 is set to be of a curve structure, so that the possibility that foreign matters are introduced due to the fact that plastic balls fall into the battery can be reduced.

The plastic ball 3 in this embodiment is made of epdm, but it may be made of PP or PE, and even if the plastic ball 3 enters the battery carelessly, the material will not pollute the electrolyte.

The liquid injection hole 2 is approximately arranged in a Z shape in an extending mode, and in addition, the blocking performance of the plastic ball and the steel ball on the liquid injection hole is improved in order to drive the plastic ball 3 and the steel ball 4 conveniently, and the liquid injection hole 2 in the embodiment is a round hole with a round cross section.

The pouring hole 2 may be formed in the battery case.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. A lithium ion battery comprising:

a battery case having an opening part,

an inner core accommodated in the battery case, and

a battery cap (1) for closing and fixing the opening part of the battery case;

the battery shell or the battery cap is provided with a liquid injection hole (2) for injecting electrolyte into the battery shell;

the liquid injection device is characterized in that the liquid injection hole (2) is a through hole extending in a curved shape, and a plastic ball (3) and a steel ball (4) for plugging the liquid injection hole are plugged in the liquid injection hole (2).

2. The lithium ion battery according to claim 1, wherein the plastic ball (3) and the steel ball (4) are arranged at intervals or in a close contact manner along the length direction of the liquid injection hole (2), and the plastic ball (3) is positioned at the inner side of the steel ball (4).

3. The lithium ion battery according to claim 2, wherein the plastic ball (3) is made of ethylene propylene diene monomer.

4. The lithium ion battery according to claim 2, characterized in that the plastic balls (3) are of PP material.

5. The lithium ion battery according to claim 2, characterized in that the plastic ball (3) is made of PE.

6. The lithium ion battery according to claim 2, characterized in that the liquid injection hole (2) is extended in a zigzag shape.

7. The lithium ion battery according to claim 2, characterized in that the electrolyte injection hole (2) opens in the battery cap (1).

8. The lithium ion battery according to claim 2, characterized in that the electrolyte injection hole (2) is a round hole.

9. The lithium ion battery of claim 2, wherein the lithium ion battery is a cylindrical battery, the battery enclosure is a cylindrical structure, and the battery cap is disposed at an axial end of the battery enclosure.

10. The utility model provides a lithium ion battery annotates liquid hole block structure, is including annotating liquid hole (2), its characterized in that, annotate liquid hole (2) and be the through-hole of curve extension to annotate the stopper of liquid hole (2) and have filled in with this plastics ball (3) and steel ball (4) of annotating the liquid hole shutoff.