JP2003288882A - Sealed battery - Google Patents
Sealed batteryInfo
- Publication number
- JP2003288882A JP2003288882A JP2002091726A JP2002091726A JP2003288882A JP 2003288882 A JP2003288882 A JP 2003288882A JP 2002091726 A JP2002091726 A JP 2002091726A JP 2002091726 A JP2002091726 A JP 2002091726A JP 2003288882 A JP2003288882 A JP 2003288882A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- conductive connection
- connection tab
- width
- battery element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、密閉型電池に関す
るものであり、とくに帯状の集電体上に電極活物質の塗
布層を形成した電極を、セパレータを介して対向させて
卷回した電池要素を有する密閉型電池に関する。
【０００２】
【従来の技術】二次電池は、正極電極と負極電極をセパ
レータを介して対向配置することで製造されているが、
とくにリチウムイオン電池等にあっては、帯状の集電体
上に電極活物質を塗布した作製した電池電極をセパレー
タを介して卷回した電池要素が用いられている。リチウ
ムイオン電池等においては、導電性が小さな非水電解液
を使用しており、銅箔、アルミニウム箔上に形成される
電極活物質層の厚さが電池の内部抵抗に大きな影響を与
えるので、電極を卷回した電池要素では電極活物質の厚
さを薄くしたものが用いられている。
【０００３】それぞれの電池電極には、１個の導電接続
タブが接合されているが、導電接続タブの厚さは、電極
活物質層の厚さよりも大きいので集電体上に導電接続タ
ブを接合した部分は、その他の部分に比べると厚さが大
きなものとなっている。導電接続タブを接合した電池電
極を、セパレータ／正極／セパレータ／負極の順に積層
し、正極と負極との間にセパレータを介在させて糸巻き
状に巻回して電池要素を作製している。
【０００４】糸巻き状に巻回した電池要素を巻回後に圧
力を加えて所定の形状とし、可撓性の外装材によって封
口したり、あるいは電池缶の開口部から収納した後に、
開口部を電池ヘッダで封口することによって密閉型電池
が作製されている。ところが、電極に導電接続タブを接
合した部分は、厚さが大きいので加圧成形を行う際に、
その他の部分に比べて圧力が集中することとなり、セパ
レータの電池電極に接合された導電接続タブに接する部
分、および電池電極に接合された導電接続タブが投影さ
れる部分のセパレータは劣化し電池の特性が不良となる
ことがあった。
【０００５】また、電池電極の幅方向の端部に電極活物
質の非塗布部を形成し、非塗布部に接続部が本体よりも
幅が大きな導電接続タブを接合した非水電解液電池が特
開平１１−１６２４４４号公報において提案されてい
る。このような電池においては、電池要素の圧縮の際の
導電接続タブの接合部におけるセパレータへの悪影響を
防止することが可能となるが、電池要素の両端部に電池
活物質が塗布されていない部分が形成されるので、電池
の体積容量密度が低下するという問題点があった。とく
に携帯型の機器等に用いられる小型の密閉型電池におい
ては、体積容量密度が低下することは大きな問題であっ
た。
【０００６】
【発明が解決しようとする課題】帯状の正極電極と負極
電極とをセパレータを介して対向させて巻回した電池要
素を有する密閉型電池において、電池要素の圧縮処理の
際にセパレータが劣化することを防止する。
【０００７】
【課題を解決するための手段】本発明の課題は、帯状の
集電体上に活物質層を形成した正極電極と負極電極とを
セパレータを介して対向させて卷回した電池要素を有す
る密閉型電池において、正極電極および負極電極に接合
した導電接続タブは、電池要素の内部に位置する部分の
幅が電池要素の外部に位置する部分の幅よりも小さなも
のである密閉型電池によって解決することができる。導
電接続タブの電池要素の内部に位置する部分は間隔を設
けて配置された複数の部分に分かれた前記の密閉型電池
である。また、正極電極、負極電極は、幅方向の全幅に
電極活物質層が形成された密閉型電池である。導電接続
タブが正極電極、負極電極の巻き始め部、もしくは巻き
終わり部に接合された密閉型電池である。
【０００８】
【発明の実施の形態】本発明の密閉型電池は、正極電極
と負極電極とを卷回して製造した電池要素のセパレータ
の劣化が、電池要素の圧縮の際に正極電極あるいは負極
電極に接合した導電接続タブによって、セパレータの導
電接続タブに接触する部分、あるいは導電接続タブの投
影部分に位置する部分のセパレータへの圧力の集中によ
って生じるものであることを見いだしたものである。
【０００９】そこで、本発明は、導電接続タブの電池要
素内に位置する部分の幅を小さくすることにより電池要
素の押圧の際に、導電接続タブに接触するセパレータ、
あるいは導電接続タブの投影部に位置するセパレータへ
圧力が集中することによるセパレータの劣化を、電池要
素内に位置する導電接続タブの幅を小さくすることによ
って解決したものである。
【００１０】以下に、図面を参照して本発明を説明す
る。図１は、本発明の密閉型電池を説明する図である。
図１（Ａ）は、本発明の密閉型電池の一部を透視した側
面図であり、図１（Ｂ）は、図１（Ａ）におけるＡ−
Ａ’線での断面を説明する図であり、図１（Ｃ）は、電
池要素の分解斜視図である。また、図１（Ｄ）は、導電
接続タブを説明する図である。図１（Ａ）に示すよう
に、密閉型電池１は、電池缶２の開口部から電池要素３
の巻回軸を開口部に垂直に収納した後に、電池要素３に
接合した正極側導電接続タブ４を、電池缶の開口部を封
口する電池ヘッダ５の金属板６に絶縁性部材７を設けて
形成した電極接続端子８に接続するとともに、負極側導
電接続タブ９が電池缶の内壁面に接合されており、図１
（Ｂ）に示すように、正極電極１０および負極電極１１
がセパレータ１２を介して巻回されており、正極側導電
接続タブ４および負極側導電接続タブ９が接合されてい
る。
【００１１】図１（Ｃ）に示すように、電池要素３は、
正極電極に正極側導電接続タブ４が接続され、負極電極
１１には、負極側導電接続タブ９が接続されて巻回さ
れ、巻止めテープ１３によって巻止めされている。
【００１２】図１（Ｄ）は、正極側導電接続タブ４を説
明する図であり、電池要素の内部に位置する部分の幅Ｗ
２は、電池要素の外部に位置する部分の幅Ｗ１に比べて
幅が小さなＴ字型タブである。Ｔ字型タブの電池要素の
外部に位置する部分の幅Ｗ１は、電池缶の内壁面、ある
いは電池ヘッダの導電接続端子に接合するのに最適な大
きさとされる。
【００１３】図２は、本発明の密閉型電池の他の実施例
を説明する図である。図２（Ａ）は、本発明の密閉型電
池の電池要素を説明する斜視図であり、電池要素３に
は、正極側導電接続タブ４および負極側導電接続タブ９
が接合されており、正極電極に正極側導電接続タブ４が
接続され、負極電極１１には、負極側導電接続タブ９が
接続されて巻回され、巻止めテープ１３によって巻止め
されている。
【００１４】また、図２（Ｃ）に示すように、正極側導
電接続タブ４は、Ｌ字型であり、電池要素の内部に位置
する部分の幅Ｗ２が電池要素の外部に位置する部分の幅
Ｗ１よりも小さなものであり、外部に位置する部分の幅
Ｗ１は、電池缶の内壁面、あるいは電池ヘッダの導電接
続端子に接合するのに最適な大きさとされる。
【００１５】図３は、本発明の密閉型電池の他の実施例
を説明する図である。図３（Ａ）は、本発明の密閉型電
池の電池要素を説明する斜視図であり、電池要素３に
は、正極側導電接続タブ４および負極側導電接続タブ９
が接合されており、図３（Ｂ）に示すように、正極電極
に正極側導電接続タブ４が接続され、負極電極１１に
は、負極側導電接続タブ９が接続されて巻回され、巻止
めテープ１３によって巻止めされている。
【００１６】また、図３（Ｃ）に示すように、正極側導
電接続タブ４は、電池要素の内部に位置する部分は、二
股に分岐し、電池要素の内部に位置する部分の幅Ｗ２
ａ、Ｗ２ｂは、電池要素の外部に位置する部分の幅Ｗ１
よりも小さなものであり、外部に位置する部分の幅Ｗ１
は、電池缶の内壁面あるいは電池ヘッダの導電接続端子
に接合するのに最適な大きさとされる。
【００１７】本発明の密閉型電池において、電池要素の
内部に位置する部分の導電接続タブの幅Ｗ１は、および
電池要素内に位置する部分の幅Ｗ２は、電池の定格電流
に応じて設定されるが、３ｍｍ〜５ｍｍとすることが好
ましい。また、厚みについては、０．０５ｍｍ〜０．１
２ｍｍのものを用いることが好ましい。
【００１８】
【発明の効果】本発明の密閉型電池は、電池要素の内部
に位置する導電接続タブの幅を電池要素の外側に位置す
る部分の幅よりも小さくしたので、正極電極および負極
電極をセパレータを介して巻回した電池要素を圧縮する
際に導電接続タブに接するセパレータへの圧力の集中に
よるセパレータの劣化を防止することができるので、電
池特性の劣化を防止することが可能となる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery, and more particularly, to a method of forming an electrode in which a coating layer of an electrode active material is formed on a strip-shaped current collector, using a separator. The present invention relates to a sealed battery having a battery element wound so as to be opposed via a battery. A secondary battery is manufactured by arranging a positive electrode and a negative electrode opposite each other with a separator interposed therebetween.
In particular, in a lithium ion battery or the like, a battery element in which a battery electrode prepared by applying an electrode active material on a belt-shaped current collector is wound around a separator is used. In lithium-ion batteries, etc., a non-aqueous electrolyte with small conductivity is used, and the thickness of the electrode active material layer formed on copper foil or aluminum foil greatly affects the internal resistance of the battery. In a battery element in which an electrode is wound, an electrode active material having a reduced thickness is used. One conductive connection tab is joined to each battery electrode. However, the thickness of the conductive connection tab is larger than the thickness of the electrode active material layer, so that the conductive connection tab is formed on the current collector. The joined portion has a larger thickness than other portions. A battery electrode in which a conductive connection tab is joined is laminated in the order of separator / positive electrode / separator / negative electrode, and wound in a pin wound shape with a separator interposed between the positive electrode and the negative electrode to produce a battery element. [0004] After winding the battery element wound in a wound shape, a pressure is applied to form a predetermined shape, and the battery element is sealed with a flexible outer material or stored from the opening of the battery can.
A sealed battery is manufactured by closing the opening with a battery header. However, the part where the conductive connection tab is joined to the electrode is thick, so when performing pressure molding,
The pressure is concentrated as compared with other parts, and the part of the separator contacting the conductive connection tab joined to the battery electrode and the part of the separator where the conductive connection tab joined to the battery electrode is projected are deteriorated and the battery is deteriorated. The characteristics sometimes became poor. Further, a non-aqueous electrolyte battery in which a non-coated portion of an electrode active material is formed at an end portion in the width direction of a battery electrode, and a non-coated portion is connected to a conductive connection tab having a connection portion having a width larger than that of the main body. This is proposed in Japanese Patent Application Laid-Open No. H11-162444. In such a battery, it is possible to prevent the separator from being adversely affected at the joint of the conductive connection tabs when the battery element is compressed, but it is possible to prevent the battery active material from being applied to both ends of the battery element. Is formed, so that the volume capacity density of the battery is reduced. In particular, in a small sealed battery used for a portable device or the like, a decrease in volume capacity density has been a serious problem. [0006] In a sealed battery having a battery element in which a strip-shaped positive electrode and a negative electrode are wound opposite to each other with a separator interposed therebetween, when the battery element is compressed, the separator is turned off. Prevent deterioration. An object of the present invention is to provide a battery element in which a positive electrode and a negative electrode each having an active material layer formed on a belt-shaped current collector are wound opposite to each other with a separator interposed therebetween. Wherein the width of the portion located inside the battery element is smaller than the width of the portion located outside the battery element in the conductive connection tab joined to the positive electrode and the negative electrode. Can be solved by The portion of the conductive connection tab located inside the battery element is the aforementioned sealed battery divided into a plurality of spaced portions. The positive electrode and the negative electrode are sealed batteries in which an electrode active material layer is formed over the entire width in the width direction. This is a sealed battery in which a conductive connection tab is joined to a winding start portion or a winding end portion of a positive electrode or a negative electrode. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a sealed battery according to the present invention, the deterioration of a separator of a battery element manufactured by winding a positive electrode and a negative electrode causes the deterioration of the positive electrode or the negative electrode when the battery element is compressed. It has been found that, due to the conductive connection tab joined to the separator, the portion is brought into contact with the conductive connection tab, or is caused by concentration of pressure on the separator in a portion located on the projected portion of the conductive connection tab. Accordingly, the present invention provides a separator which contacts the conductive connection tab when the battery element is pressed by reducing the width of the portion of the conductive connection tab located in the battery element.
Alternatively, deterioration of the separator due to concentration of pressure on the separator located at the projection portion of the conductive connection tab is solved by reducing the width of the conductive connection tab located inside the battery element. The present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a sealed battery according to the present invention.
FIG. 1A is a side view in which a part of the sealed battery of the present invention is seen through, and FIG.
It is a figure explaining the cross section in the A 'line, and FIG.1 (C) is an exploded perspective view of a battery element. FIG. 1D illustrates a conductive connection tab. As shown in FIG. 1 (A), a sealed battery 1 includes a battery element 3 through an opening of a battery can 2.
After the winding shaft is vertically accommodated in the opening, the positive-electrode-side conductive connecting tab 4 joined to the battery element 3 is provided with the insulating member 7 on the metal plate 6 of the battery header 5 that seals the opening of the battery can. In addition to the connection to the electrode connection terminal 8 formed as described above, the negative electrode side conductive connection tab 9 is joined to the inner wall surface of the battery can.
As shown in (B), the positive electrode 10 and the negative electrode 11
Is wound with a separator 12 interposed therebetween, and the positive electrode side conductive connection tab 4 and the negative electrode side conductive connection tab 9 are joined. As shown in FIG. 1 (C), the battery element 3
The positive electrode-side conductive connection tab 4 is connected to the positive electrode, and the negative electrode-side conductive connection tab 9 is connected to the negative electrode 11, which is wound and fastened by a winding tape 13. FIG. 1D is a view for explaining the positive electrode side conductive connection tab 4, and shows a width W of a portion located inside the battery element.
Reference numeral 2 denotes a T-shaped tab whose width is smaller than the width W1 of a portion located outside the battery element. The width W1 of the portion of the T-shaped tab located outside the battery element is an optimal size for joining to the inner wall surface of the battery can or the conductive connection terminal of the battery header. FIG. 2 is a view for explaining another embodiment of the sealed battery of the present invention. FIG. 2A is a perspective view illustrating a battery element of the sealed battery according to the present invention. The battery element 3 includes a positive conductive connection tab 4 and a negative conductive connection tab 9.
The positive electrode-side conductive connection tab 4 is connected to the positive electrode, and the negative electrode-side conductive connection tab 9 is connected to the negative electrode 11, which is wound and fastened by a winding tape 13. Further, as shown in FIG. 2 (C), the positive electrode side conductive connection tab 4 is L-shaped, and the width W2 of the portion located inside the battery element is equal to the width W2 of the portion located outside the battery element. The width W1 is smaller than the width W1, and the width W1 of the portion located outside is an optimal size for joining to the inner wall surface of the battery can or the conductive connection terminal of the battery header. FIG. 3 is a view for explaining another embodiment of the sealed battery of the present invention. FIG. 3A is a perspective view illustrating a battery element of the sealed battery according to the present invention. The battery element 3 includes a positive conductive connection tab 4 and a negative conductive connection tab 9.
As shown in FIG. 3B, the positive electrode-side conductive connection tab 4 is connected to the positive electrode, and the negative electrode-side conductive connection tab 9 is connected to the negative electrode 11. It is stopped by a stop tape 13. As shown in FIG. 3 (C), the portion of the positive electrode side conductive connection tab 4 located inside the battery element is branched into two parts, and the width W2 of the portion located inside the battery element is divided.
a and W2b are widths W1 of portions located outside the battery element.
Smaller than the width W1 of the portion located outside.
Is optimally sized to be joined to the inner wall surface of the battery can or to the conductive connection terminals of the battery header. In the sealed battery according to the present invention, the width W1 of the conductive connection tab located inside the battery element and the width W2 located inside the battery element are set according to the rated current of the battery. However, it is preferably 3 mm to 5 mm. The thickness is 0.05 mm to 0.1 mm.
It is preferable to use a 2 mm one. According to the sealed battery of the present invention, the width of the conductive connection tab located inside the battery element is smaller than the width of the portion located outside the battery element. Can be prevented from being deteriorated due to concentration of pressure on the separator in contact with the conductive connection tab when compressing the battery element wound with the separator interposed therebetween, so that deterioration of the battery characteristics can be prevented. .
【図面の簡単な説明】
【図１】図１は、本発明の密閉型電池を説明する図であ
る。
【図２】
【符号の説明】
１…密閉型電池、２…電池缶、３…電池要素、４…正極
側導電接続タブ、５…電池ヘッダ、６…金属板、７…絶
縁性部材、８…電極接続端子、９…負極側導電接続タ
ブ、１０…正極電極、１１…負極電極、１２…セパレー
タ、１３…巻止めテープ、Ｗ１…外部に位置する部分の
幅、Ｗ２，Ｗ２ａ，Ｗ２ｂ…電池要素の内部に位置する
部分の幅BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a sealed battery of the present invention. DESCRIPTION OF THE SYMBOLS 1 ... sealed battery 2 ... battery can 3 ... battery element 4 ... positive electrode side conductive connection tab 5 ... battery header 6 ... metal plate 7 ... insulating member 8 ... Electrode connection terminal, 9 ... Negative electrode side conductive connection tab, 10 ... Positive electrode, 11 ... Negative electrode, 12 ... Separator, 13 ... Winding tape, W1 ... Width of the portion located outside, W2, W2a, W2b ... Battery The width of the part inside the element
─────────────────────────────────────────────────────
【手続補正書】
【提出日】平成１４年４月５日（２００２．４．５）
【手続補正１】
【補正対象書類名】明細書
【補正対象項目名】図面の簡単な説明
【補正方法】変更
【補正内容】
【図面の簡単な説明】
【図１】図１は、本発明の密閉型電池を説明する図であ
る。
【図２】図２は、本発明の密閉型電池の他の実施例を説
明する図である。
【図３】図３は、本発明の密閉型電池の他の実施例を説
明する図である。
【符号の説明】
１…密閉型電池、２…電池缶、３…電池要素、４…正極
側導電接続タブ、５…電池ヘッダ、６…金属板、７…絶
縁性部材、８…電極接続端子、９…負極側導電接続タ
ブ、１０…正極電極、１１…負極電極、１２…セパレー
タ、１３…巻止めテープ、Ｗ１…外部に位置する部分の
幅、Ｗ２，Ｗ２ａ，Ｗ２ｂ…電池要素の内部に位置する
部分の幅────────────────────────────────────────────────── ───
[Procedure amendment] [Date of submission] April 5, 2002 (2002.4.5) [Procedure amendment 1] [Document name to be amended] Description [Item name to be amended] Brief explanation of drawings [Method of amendment] FIG. 1 is a diagram illustrating a sealed battery according to the present invention. FIG. 2 is a diagram illustrating another embodiment of the sealed battery of the present invention. FIG. 3 is a diagram illustrating another embodiment of the sealed battery of the present invention. [Description of Signs] 1 ... sealed battery, 2 ... battery can, 3 ... battery element, 4 ... positive electrode side conductive connection tab, 5 ... battery header, 6 ... metal plate, 7 ... insulating member, 8 ... electrode connection terminal , 9: negative electrode side conductive connection tab, 10: positive electrode, 11: negative electrode, 12: separator, 13: wrapping tape, W1: width of the portion located outside, W2, W2a, W2b: inside the battery element The width of the part to be located
Claims (1)
極電極と負極電極とをセパレータを介して対向させて卷
回した電池要素を有する密閉型電池において、正極電極
および負極電極に接合した導電接続タブは、電池要素の
内部に位置する部分の幅が電池要素の外部に位置する部
分の幅よりも小さなものであることを特徴とする密閉型
電池。Claims: 1. A sealed battery having a battery element in which a positive electrode and a negative electrode each having an active material layer formed on a belt-shaped current collector are wound opposite to each other with a separator interposed therebetween. A sealed battery comprising: a conductive connection tab joined to a positive electrode and a negative electrode, wherein a width of a portion located inside the battery element is smaller than a width of a portion located outside the battery element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002091726A JP2003288882A (en) | 2002-03-28 | 2002-03-28 | Sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002091726A JP2003288882A (en) | 2002-03-28 | 2002-03-28 | Sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003288882A true JP2003288882A (en) | 2003-10-10 |
Family
ID=29236744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002091726A Pending JP2003288882A (en) | 2002-03-28 | 2002-03-28 | Sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003288882A (en) |
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