WO2014092262A1

WO2014092262A1 - Lithium battery having excellent stability

Info

Publication number: WO2014092262A1
Application number: PCT/KR2013/004021
Authority: WO
Inventors: 김유석; 박상선; 김범수; 최아람
Original assignee: 주식회사 비츠로셀
Priority date: 2012-12-12
Filing date: 2013-05-08
Publication date: 2014-06-19
Also published as: KR20140076180A; KR101464539B1

Abstract

The present invention provides a lithium battery having excellent stability, comprising: a header; a support coming into contact with at least part of the header and is formed to protrude from the surface of the header; a battery accommodation unit coupled to the header; an anode and a cathode disposed in the battery accommodation unit; a separator for insulating the anode or the cathode; and an electrode pin which is provided to the center of one side of the header so as to be insulated from the header, and which comes into contact with the anode or the cathode, thereby minimizing dimensional changes of the header even at high temperatures and preventing the electrolyte from leaking to the outside.

Description

Excellent lithium battery

The present invention relates to a lithium battery, and more particularly, to a lithium battery having excellent safety of changing the header shape of a lithium battery and less dimensional deformation of the header even at a high temperature so that no electrolyte solution leaks to the outside.

Lithium batteries, for example, lithium thionyl (Li / SOCl 2) batteries have a great advantage over other batteries in high capacity, low self discharge rate, excellent low temperature characteristics, etc., and thus are widely used for AMR and RFID communication power supplies. The life of a lithium battery can be used for 5 to 20 years or more depending on the usage conditions after installing it in a single device. Since it is used in a wide temperature range of -40 ℃ to 150 ℃, it is sealed to prevent electrolyte leakage from outside the battery at high temperatures Technology is very important.

For such sealing, in case of lithium ion battery, alkaline battery, and manganese battery, gasket is inserted between case and header and then sealed by crimping method, and case and header are welded by laser welding. I do not want to.

1 is a cross-sectional view schematically illustrating a conventional lithium battery, FIG. 2 is a top plan view of FIG. 1, and FIG. 3 is a cross-sectional view of the header of FIG. 1.

The conventional lithium battery 10 includes a header 11, a battery accommodating part 10 coupled to the header 110, a positive electrode 14a and a negative electrode 14b, and a positive electrode 14a installed in the battery accommodating part 10. The separator 15 disposed between the cathode 14b and the center of one surface of the header 11 includes an electrode pin 16 in contact with the anode 14a.

An electrode pin accommodating part 12 is formed at the center of the header 11, and the electrode pin 16 is in contact with the anode 140a through the electrode pin accommodating part 12.

When the lithium battery 10 is used at a high temperature of 130 ° C. or higher, as the electrolyte evaporates, the lithium battery 10 cannot withstand the internal pressure, and the header 11 swells, causing leakage of the electrolyte 17.

In order to prevent the leakage of the electrolyte 17 as described above, a method of increasing the thickness of the header 11 or less electrolyte 17 has been proposed. However, both methods have a problem in that the capacity of the battery is reduced because the amount of the electrolyte is reduced.

Background art related to the present invention is a lithium battery and a method of manufacturing a lithium battery disclosed in the Republic of Korea Patent Publication No. 10-2010-0111023 (2010.10.14. Publication).

An object of the present invention is to provide a lithium battery that can change the shape of the header of the lithium battery, the dimensional deformation of the header at a high temperature, and can prevent the leakage of the electrolyte solution.

In addition, another object of the present invention is to provide a lithium battery having a high capacity while containing the same amount of an electrolyte solution as a conventional lithium battery by changing the header shape of the lithium battery.

Battery case according to an embodiment of the present invention for achieving the above object, the header; A support in contact with at least a portion of the header and configured to protrude from a surface of the header; And a battery accommodating part coupled to the header to accommodate a positive electrode and a negative electrode.

Lithium battery according to an embodiment of the present invention for achieving the above object, the header; A support in contact with at least a portion of the header and configured to protrude from a surface of the header; A battery accommodating portion coupled to the header; A positive electrode and a negative electrode installed in the battery accommodating part; A separator that insulates the positive or negative electrode; And an electrode pin disposed at the center of one surface of the header to be insulated from the header and in contact with the anode or the cathode.

The support may be composed of an annular body and an extension portion extending from the body in a resin shape.

The support may be integrally formed with the header, and may be formed by pressing.

The support may be manufactured separately from the header and bonded to the upper or lower surface of the header.

According to the present invention, a lithium battery having excellent safety can be provided by changing the header shape of a lithium battery to prevent dimensional deformation of the header even at high temperatures and preventing leakage of the electrolyte.

In addition, by changing the header shape of the lithium battery, it is possible to have a high capacity while containing the same amount of electrolyte as the existing lithium battery.

1 is a cross-sectional view schematically showing a conventional lithium battery.

FIG. 2 is a top plan view of FIG. 1.

3 is a cross-sectional view of the header of FIG. 1.

4 is a schematic cross-sectional view of a lithium battery according to a first exemplary embodiment of the present invention.

5 is a top plan view of FIG. 4.

FIG. 6 is a side cross-sectional view taken along line AA ′ of FIG. 5.

FIG. 7 is a side cross-sectional view taken along line BB ′ of FIG. 5.

8 and 9 are top plan views schematically illustrating an exploded portion of a lithium battery according to a second exemplary embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the embodiments are to make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a lithium battery according to a first exemplary embodiment of the present invention will be described in detail with reference to FIGS. 4 to 7.

4 is a cross-sectional view schematically illustrating a lithium battery according to a first exemplary embodiment of the present invention, and FIG. 5 is a top plan view of FIG. 4.

4, the lithium battery 100 according to the first embodiment of the present invention includes a header (110); A support 120 formed to protrude from the surface of the header 110; A battery accommodating part 130 coupled to the header 110; A positive electrode 140a and a negative electrode 140b installed in the battery accommodating part 130; A separator 150 interposed between the positive electrode 140a and the negative electrode 140b; And an electrode pin 160 disposed at the center of one surface of the header 110 to be in contact with the anode 140a.

The battery accommodating part 130 of the lithium battery 100 is formed in a cylindrical shape with an open top, and accommodates a positive electrode 140a, a negative electrode 140b, and a separator 150 therein. In addition, a header 110 having an outer diameter equal to the inner diameter of the battery accommodating part 130 is laser welded on the battery accommodating part 130.

The electrode pin accommodating part 111 (refer to FIG. 5) is formed at the center of the header 110, and the electrode pin 160 penetrates through the electrode pin accommodating part 111 to be in contact with the anode 140a. In addition, although not shown, an electrolyte injection hole is formed in the header 110, and the metal ball is welded after the header 110 is welded to the battery accommodating part 130 and the electrolyte is injected into the battery accommodating part 130. As a result, the lithium battery 100 is sealed.

Here, the anode 140a includes a carbon layer, and the cathode 140b includes lithium. The separator 150 interposed between the anode 140a and the cathode 140b is an electrical insulator and allows ions to pass therethrough. On the other hand, the battery accommodating part 130 accommodates the electrolyte solution 170 in the internal space.

Referring to FIG. 5, the support 120 includes a main body 121 and an extension 122. The support 120 according to the first embodiment is integrally formed with the header 110. Support 120 may be formed by press working, specifically punched out. A punch is a process of generating a shear stress in a raw material and cutting it to have a predetermined shape.

The main body 121 is formed to have an annular shape, and is formed to protrude from the surface of the header 110 while being in contact with the header 110. The extension part 122 is formed to have a resin shape, and is formed to protrude from the surface of the header 110 while contacting the header 110 like the main body 121. Meanwhile, the extension part 122 is formed to extend from the main body 121.

Here, the electrode pin accommodating part 111 in the center of the header 23 is a passage through which the electrode pin 160 passes. Meanwhile, a battery accommodating part 130 is disposed around an outer circumferential surface of the header 110, and the header 110 is welded to the battery accommodating part 130 to be coupled thereto.

6 is a side cross-sectional view taken along line AA ′ of FIG. 5, and FIG. 7 is a side cross-sectional view taken along line BB ′ of FIG. 5.

6 and 7, an electrode pin accommodating part 111 accommodating electrode pins 160 (refer to FIG. 4) is formed at the center of one surface of the header 110 according to the first embodiment of the present invention. The main body 121 of the supporter 120 is formed in a ring shape around the electrode pin accommodating part 111 to have a shape surrounding the electrode pin accommodating part 111. The extension part 122 is formed to extend from the main body 121 to have a resin shape.

Hereinafter, a lithium battery according to a second exemplary embodiment of the present invention will be described in detail with reference to FIGS. 8 to 9.

8 and 9, an electrode pin accommodating part 111 for accommodating electrode pins 160 (see FIG. 4) is formed at the center of one surface of the header 110 according to the second embodiment of the present invention. do. The support 120 is disposed around the electrode pin accommodating part 111. Support 120 is a support 120 is composed of a body 121 and the extension 122.

The support 120 according to the second embodiment of the present invention is manufactured separately from the first embodiment, and is bonded to at least one of the upper and lower surfaces of the header 110. Support 120 is disposed so that the electrode pin receiving portion 111 is in the center.

Although the electrode pins have been described as being in contact with the positive electrode throughout the embodiments of the present invention, the present invention is not limited thereto, and the electrode pins may be formed to contact the negative electrode as necessary.

In addition, although the lithium battery is described as an example of a coin-type battery throughout the embodiment of the present invention, the present invention is not limited thereto. The lithium battery may be in various forms, for example, a cylindrical battery.

Although the above has been described with reference to the embodiments of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications can be said to belong to the present invention without departing from the scope of the technical idea provided by the present invention. Therefore, the scope of the present invention should be judged by the claims described below.

Claims

A header;

A support in contact with at least a portion of the header and configured to protrude from a surface of the header; And

And a battery accommodating portion coupled to the header to accommodate a positive electrode and a negative electrode.
The method of claim 1,

The support base is a battery case, characterized in that consisting of an annular body and an extension portion extending from the body in a resin shape.
The method of claim 1,

The support case is a battery case, characterized in that formed integrally with the header.
The method of claim 3,

The support is a battery case, characterized in that formed by pressing.
The method of claim 1,

The support is manufactured separately from the header, the battery case, characterized in that bonded to at least one of the upper and lower surfaces of the header.
A header;

A support in contact with at least a portion of the header and configured to protrude from a surface of the header;

A battery accommodating portion coupled to the header;

A positive electrode and a negative electrode installed in the battery accommodating part;

A separator that insulates the positive or negative electrode; And

And an electrode pin disposed at the center of one surface of the header to be insulated from the header and in contact with the positive electrode or the negative electrode.
The method of claim 6,

The support base is a lithium battery comprising a ring-shaped body and an extension portion extending from the body in a resin shape.
The method of claim 6,

And the support is formed integrally with the header.
The method of claim 8,

The support is a lithium battery, characterized in that formed by pressing.
The method of claim 1,

The support is manufactured separately from the header, the lithium battery, characterized in that bonded to the upper or lower surface of the header.
The method of claim 6,

And the electrode pin is in contact with the positive electrode.
The method of claim 6,

And the electrode pin is in contact with the negative electrode.
The method of claim 6,

A negative electrode or a positive electrode coupled to the electrode pin is separated by the separator.
The method of claim 6,

The lithium battery is a lithium battery, characterized in that the coin-type battery.
The method of claim 6,

The lithium battery is a lithium battery, characterized in that the cylindrical battery.
The method of claim 6,

A lithium battery, characterized in that the electrode pin receiving portion for receiving the electrode pin is formed in the center of the header.