JPH10255818A - Wound battery - Google Patents
Wound batteryInfo
- Publication number
- JPH10255818A JPH10255818A JP9060995A JP6099597A JPH10255818A JP H10255818 A JPH10255818 A JP H10255818A JP 9060995 A JP9060995 A JP 9060995A JP 6099597 A JP6099597 A JP 6099597A JP H10255818 A JPH10255818 A JP H10255818A
- Authority
- JP
- Japan
- Prior art keywords
- separator
- electrode
- negative electrode
- positive electrode
- winding
- 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
-
- Y02E60/12—
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、非水電解液電池な
どに採用されている渦巻き型の電極構造を有する捲回型
電池に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound type battery having a spiral electrode structure which is employed in non-aqueous electrolyte batteries and the like.
【０００２】[0002]
【従来の技術】リチウムなどの軽金属を負極とする非水
電解液電池は、鉛電池やニッケル−カドミウム電池に比
べて、エネルギー密度が高く自己放電も少ないなどとい
う利点を有しているため、電子機器の高性能化、小型化
などを背景として、利用範囲が広がってきている。2. Description of the Related Art A non-aqueous electrolyte battery using a light metal such as lithium as a negative electrode has advantages such as higher energy density and less self-discharge than lead batteries and nickel-cadmium batteries. With the background of high performance and miniaturization of devices, the range of use is expanding.
【０００３】この非水電解液電池には、通常、極材間に
セパレータが介在するように、極材とセパレータとを積
層し、共巻した捲回型電極複合体が用いられる。この捲
回型電極複合体は、いずれも帯状とした正極、負極およ
びセパレータを、例えば、正極、セパレータ、負極、セ
パレータの順に積層し、捲回することにより製造される
ものであり、少ない容積で広い有効電極面積を得ること
ができるようにしたものである。[0003] In this nonaqueous electrolyte battery, a wound electrode composite is used in which an electrode material and a separator are laminated and co-wound so that the separator is interposed between the electrode materials. This wound electrode composite is manufactured by laminating a positive electrode, a negative electrode, and a separator, all of which are in the form of a strip, in the order of, for example, a positive electrode, a separator, a negative electrode, and a separator, and winding the resultant. A wide effective electrode area can be obtained.
【０００４】捲回型電極におけるセパレータとしては、
一般に、有機溶媒に不溶であり、電極や電極活物質に対
して安定なポリエチレンやポリプロピレンなどのポリオ
レフィン系材料の微多孔性の膜が用いられている。[0004] As a separator in a wound electrode,
In general, a microporous film of a polyolefin-based material such as polyethylene or polypropylene, which is insoluble in an organic solvent and stable to an electrode or an electrode active material, is used.
【０００５】従来、ポリオレフィン系材料のセパレータ
を使用して製造した捲回型電極においては、正負極間の
抵抗が１０００ＭΩ以上であるべきところ、１００ＭΩ
以下になるものが発生する場合があった。このような電
極に電解液を注入して電池を製造しても、定められた電
圧が得られない。このような電極間の抵抗値の低減は、
導電性物質がセパレータを突き破り、正負極間に短絡が
生ずることが原因と考えられる。Conventionally, in a wound electrode manufactured using a polyolefin-based separator, the resistance between the positive electrode and the negative electrode should be 1000 MΩ or more, but 100 MΩ.
In some cases, the following occurred. Even if an electrolyte is injected into such an electrode to manufacture a battery, a predetermined voltage cannot be obtained. Such a reduction in the resistance value between the electrodes,
It is considered that the cause is that the conductive material breaks through the separator and a short circuit occurs between the positive and negative electrodes.
【０００６】この短絡を防止し得る技術としては、例え
ば、特開平５−３３５００７号公報に、貫通孔を有する
保護膜をセパレータと電極との間に配置してセパレータ
の破損を防止した電極が開示されている。また、特開平
６−２１２００６号公報には、特定の分子量を有する高
密度ポリエチレンを適宜混合し、突き刺し最大荷重を向
上させたセパレータが開示されている。また、特開平７
−２６８１１８号公報には、特定の条件で二軸延伸を行
うことなどにより引っ張り強度を高めたポリエチレンお
よびポリプロピレンからなるセパレータが開示されてい
る。As a technique capable of preventing this short circuit, for example, Japanese Unexamined Patent Publication No. Hei 5-335007 discloses an electrode in which a protective film having a through hole is disposed between the separator and the electrode to prevent the separator from being damaged. Have been. JP-A-6-212006 discloses a separator in which a high-density polyethylene having a specific molecular weight is appropriately mixed and pierced to increase the maximum load. Also, Japanese Patent Application Laid-Open
Japanese Patent Publication No. -268118 discloses a separator made of polyethylene and polypropylene whose tensile strength is increased by performing biaxial stretching under specific conditions.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、前記従
来の短絡防止方法は、部品点数が増加したり製造工程が
複雑になるなど、必ずしも簡便ではなく、汎用性のある
有効な短絡防止方法ではなかった。However, the conventional method for preventing short-circuiting is not always simple, such as an increase in the number of parts and the manufacturing process is complicated. .
【０００８】本発明は、かかる事情に鑑み、正極と負極
の短絡を簡便な方法で防止した捲回型電池を提供するこ
とを目的とする。[0008] In view of such circumstances, an object of the present invention is to provide a wound battery in which a short circuit between a positive electrode and a negative electrode is prevented by a simple method.
【０００９】[0009]
【課題を解決するための手段】前記目的を達成するため
に、本発明の捲回型電池は、帯状の正極、負極およびセ
パレータを積層し捲回した電極を備えた捲回型電池にお
いて、前記正極、負極およびセパレータの少なくとも一
つが積層方向に凸部を有することを特徴とする。Means for Solving the Problems To achieve the above object, a wound type battery according to the present invention is a wound type battery provided with an electrode obtained by laminating and winding a strip-shaped positive electrode, a negative electrode and a separator. At least one of the positive electrode, the negative electrode, and the separator has a protrusion in the stacking direction.
【００１０】このような構成にすることにより、極材と
セパレータとの間に発生する圧力が全体としては緩和さ
れ、その結果、正負極間の短絡が生じにくくなる。本発
明者は、過充電状態にした場合に生じる負極表面での正
極金属の析出が、極材とセパレータとの間の圧力の上昇
とともに増加することを見出し、この知見に基づいて本
発明を完成させるに至ったものである。すなわち、単に
捲回型電極を製造する際のバックテンションを低くした
だけでは極材とセパレータとの複合シートに巻きずれが
発生しやすくなることを考慮し、帯状の正極、負極およ
びセパレータの少なくとも一つに凸部を設けて複合シー
トの厚さを部分的に厚くすることにより、この部分に発
生する高いテンションにより巻きずれを防止しながら、
凸部以外の部分における積層方向の押圧の緩和を実現し
たものである。With this configuration, the pressure generated between the electrode material and the separator is reduced as a whole, and as a result, a short circuit between the positive electrode and the negative electrode hardly occurs. The present inventor has found that the deposition of the positive electrode metal on the negative electrode surface that occurs when the battery is overcharged increases with an increase in the pressure between the electrode material and the separator, and completed the present invention based on this finding. That is what led to it. That is, considering that simply lowering the back tension when manufacturing a wound electrode is likely to cause a winding shift in the composite sheet of the electrode material and the separator, at least one of the strip-shaped positive electrode, the negative electrode, and the separator is taken into consideration. By providing a convex part on one and partially increasing the thickness of the composite sheet, while preventing winding deviation due to high tension generated in this part,
This is to reduce the pressure in the laminating direction in the portion other than the convex portion.
【００１１】前記構成においては、凸部を設ける位置に
特に制限はないが、凸部が捲回とともに渦巻き模様を形
成する端辺部に設けられることが好ましい。このような
構成にすることにより、凸部は、円筒型の捲回型電極の
底面近辺に位置することになり、基本的に、電池反応の
均一性が確保される。凸部を捲回型電極の中心部に設け
た場合には、その凸部の態様によっては、電池反応を不
均一にするおそれがある。なお、巻きずれを防止する観
点などから、凸部は両端部に設けることが好ましい。In the above configuration, there is no particular limitation on the position where the convex portion is provided, but it is preferable that the convex portion is provided at an end portion forming a spiral pattern together with the winding. With such a configuration, the convex portion is located near the bottom surface of the cylindrical wound electrode, and basically, the uniformity of the battery reaction is ensured. When the convex portion is provided at the center of the wound electrode, the battery reaction may be non-uniform depending on the form of the convex portion. In addition, it is preferable to provide protrusions at both ends from the viewpoint of preventing winding deviation.
【００１２】また、前記構成においては、凸部が捲回が
開始される端辺部に設けられることが好ましい。このよ
うに構成にすることにより、捲回開始時の巻きずれが発
生しにくくなり、より有効に巻きずれを防止できる。Further, in the above configuration, it is preferable that the convex portion is provided at an end portion where the winding is started. By adopting such a configuration, winding deviation at the start of winding hardly occurs, and winding deviation can be prevented more effectively.
【００１３】さらに、前記構成においては、凸部が設け
られた正極、負極およびセパレータにおいて、前記凸部
の厚さが、この凸部以外の部分の厚さを１として、１．
００５〜６であることが好ましい。この値が１．００５
より小さいと、極材やセパレータの厚さのばらつきが影
響して圧力の緩和効果が十分に得られない。一方、この
値が６を超えると、捲回型電極を所定の電池缶に挿入で
きなくなったり、捲回型電極の長さを短くせざるを得な
くなって電池容量が低下することになる。また、通常、
極材やセパレータに使用される素材などを考慮すると、
同様の観点から、前記の値は、１．００５〜１．３であ
ることがさらに好ましい。Further, in the above configuration, in the positive electrode, the negative electrode, and the separator provided with the convex portions, the thickness of the convex portions is defined as 1 except that the thickness of the portion other than the convex portions is 1.
It is preferably from 005 to 6. This value is 1.005
If it is smaller, the effect of pressure reduction cannot be sufficiently obtained due to the influence of variations in the thickness of the electrode material and the separator. On the other hand, if this value exceeds 6, the wound electrode cannot be inserted into a predetermined battery can, or the length of the wound electrode must be shortened, resulting in a reduction in battery capacity. Also, usually
Considering the materials used for electrodes and separators,
From the same viewpoint, the above value is more preferably from 1.005 to 1.3.
【００１４】一方、前記構成における凸部の面積につい
ては、凸部が設けられた正極、負極およびセパレータに
おいて、前記凸部の面積が、この凸部以外の部分の面積
を１として、０．００５〜０．３であることが好まし
い。この値が０．００５よりも小さいと、凸部以外の部
分での圧力の緩和を十分に図ることができない。一方、
この値が０．３を超えると、導電性微粒子による正負極
間の短絡の危険が増加し、また、電池反応も不均一にな
るおそれがある。On the other hand, in the positive electrode, the negative electrode and the separator provided with the convex portions, the area of the convex portions is 0.005 with respect to the area of the portion other than the convex portions as 1. It is preferably from 0.3 to 0.3. If this value is smaller than 0.005, it is not possible to sufficiently reduce the pressure in portions other than the convex portions. on the other hand,
If this value exceeds 0.3, the danger of a short circuit between the positive and negative electrodes due to the conductive fine particles increases, and the battery reaction may become uneven.
【００１５】[0015]
【発明の実施の形態】図１は、本発明の捲回型電極に用
いる帯状部材の一実施例の斜視図である。この負極とな
る帯状部材１は、捲回の際に巻き込まれて渦巻き模様を
形成し、円筒型の捲回型電極の底面を形成する辺である
長辺側の両端部に凸部１１を有しており、短辺（捲回が
開始される辺）の断面形状が全体としては凹状となって
いる。図１においては、凸部が捲回していく長辺方向に
連続的に形成されているが、凸部は、断続的に形成され
ていてもよい。この凸部１１は、例えば、帯状部材１を
ロールプレスにより成形する際に使用する片方のロール
を溝付きロールとすることにより形成することができ
る。FIG. 1 is a perspective view of one embodiment of a belt-like member used for a wound electrode according to the present invention. The strip-shaped member 1 serving as the negative electrode is wound during winding to form a spiral pattern, and has convex portions 11 at both ends on the long side which is the side forming the bottom surface of the cylindrical wound electrode. The cross-sectional shape of the short side (the side where winding is started) is concave as a whole. In FIG. 1, the convex portion is formed continuously in the long side direction in which it is wound, but the convex portion may be formed intermittently. The convex portion 11 can be formed, for example, by forming one of the rolls used when the band-shaped member 1 is formed by a roll press into a grooved roll.
【００１６】図２は、図１に示した負極となる帯状部材
１と、セパレータ３と、正極となる帯状部材２と、セパ
レータ３とを、この順序で重ね合わせて複合シートとし
た後に、このシートを捲回して得た電極を使用した捲回
型電池の断面を模式的に示したものである。なお、図２
に示した形態においては、負極１のみが凸部を有してい
るが、正極２およびセパレータ３のいずれかのみが凸部
を有していてもよく、これら正負極１、２およびセパレ
ータ３の２以上が凸部を有していてもよい。FIG. 2 shows that the band member 1 serving as the negative electrode, the separator 3, the band member 2 serving as the positive electrode, and the separator 3 shown in FIG. FIG. 1 schematically shows a cross section of a wound battery using an electrode obtained by winding a sheet. Note that FIG.
In the embodiment shown in (1), only the negative electrode 1 has a convex portion, but only one of the positive electrode 2 and the separator 3 may have a convex portion. Two or more may have a convex part.
【００１７】図３は、捲回型電池の一般的構造を示した
ものである。このような一般的捲回型電池に本発明は適
用され得る。FIG. 3 shows a general structure of a wound type battery. The present invention can be applied to such a general wound type battery.
【００１８】本発明の捲回型電池を構成する各部材の材
料などには、特に制限はなく、一般的に使用されている
ものを用いればよい。There are no particular restrictions on the material of each member constituting the wound battery of the present invention, and generally used materials may be used.
【００１９】例えば、セパレータとしては、イオン導電
性が良好で耐薬品性が高く、機械的強度が高いものが好
ましく、ポリオレフィン系の微多孔質膜などが好まし
い。例えば、ポリエチレンの微多孔質膜やポリエチレン
およびポリプロピレンからなる微多孔質膜が好適であ
る。膜厚は、２５μｍ前後のものがよく使用される。For example, as the separator, a separator having good ionic conductivity, high chemical resistance and high mechanical strength is preferable, and a polyolefin-based microporous film is preferable. For example, a microporous membrane made of polyethylene or a microporous membrane made of polyethylene and polypropylene is preferable. A film thickness of around 25 μm is often used.
【００２０】また、電解液としては、有機溶媒にリチウ
ム塩を溶解したものが一般的に用いれられる。有機溶媒
としては、プロピレンカーボネート、エチレンカーボネ
ート、テトラハイドロフラン、ジエチルエーテルなどを
単独または混合して用いることができる。リチウム塩と
しては、ＬｉＢＦ4 、ＬｉＣｌＯ4 、ＬｉＢｒなどの公
知のものを使用することができる。As the electrolytic solution, a solution obtained by dissolving a lithium salt in an organic solvent is generally used. As the organic solvent, propylene carbonate, ethylene carbonate, tetrahydrofuran, diethyl ether or the like can be used alone or in combination. Known lithium salts such as LiBF 4 , LiClO 4 , and LiBr can be used.
【００２１】負極に用いる負極活物質としては、充放電
反応に伴いリチウムなどのアルカリ金属をドープまたは
脱ドープする材料が用いられ、具体的には、ポリアセ
ン、ポリピロールなどの導電性ポリマー、コークス、グ
ラファイト、カーボンファイバーなどの炭素材料を使用
することができる。特に、高いエネルギー密度を得るた
めには、炭素材料が好ましい。As the negative electrode active material used for the negative electrode, a material which can be doped or de-doped with an alkali metal such as lithium during charge / discharge reaction is used. Specifically, conductive polymers such as polyacene and polypyrrole, coke, graphite And carbon materials such as carbon fiber. In particular, a carbon material is preferable for obtaining a high energy density.
【００２２】また、正極に用いる正極活物質としては、
二酸化マンガン、五酸化二バナジウムのような遷移金属
酸化物、硫化鉄、硫化チタンのような遷移金属カルコゲ
ン化物、さらには、これらとリチウムとの複合化合物な
どとを用いることができる。特に、高いエネルギー密度
を得るためには、リチウム・コバルト複合酸化物やリチ
ウム・ニッケル複合酸化物などが好ましい。The positive electrode active material used for the positive electrode includes:
Transition metal oxides such as manganese dioxide and divanadium pentoxide, transition metal chalcogenides such as iron sulfide and titanium sulfide, and composite compounds of these with lithium can be used. In particular, in order to obtain a high energy density, a lithium-cobalt composite oxide, a lithium-nickel composite oxide, or the like is preferable.
【００２３】[0023]
【実施例】以下、本発明の実施例をもって詳細に説明す
るが、本発明はこれらの実施例に限定されるものではな
い。EXAMPLES The present invention will be described in detail below with reference to examples of the present invention, but the present invention is not limited to these examples.
【００２４】（実施例１）炭素材料粉末と結着剤として
のフッ化ビニリデン樹脂を重量比で９：１になるように
混合した後、Ｎ−メチル−２−ピロリドンに分散させた
混合材料を作製した。この混合材料を、厚さ１０μｍ、
幅６０ｍｍ、長さ６００ｍｍの帯状の銅箔上に均一に塗
布し、乾燥させた。この銅箔を、直径５０ｍｍφで長さ
１００ｍｍのロ−ルに５８ｍｍ間隔で深さ３μｍの溝を
周方向に２本設けた溝付きロールと、同じ直径と長さの
フラットロールとを備えたロールプレス機のロール間に
通して圧縮成形した。その結果、中央部の厚さ２５０の
μｍ、両端部の厚さ２５２μｍで各端部の幅が１ｍｍの
負極材料を作製した。この負極材料は、概略図１に示し
たような形状を有していた。(Example 1) A carbon material powder and a vinylidene fluoride resin as a binder were mixed at a weight ratio of 9: 1, and the mixed material dispersed in N-methyl-2-pyrrolidone was used. Produced. This mixed material is 10 μm thick,
It was uniformly applied on a strip of copper foil having a width of 60 mm and a length of 600 mm, and was dried. This copper foil is provided with a grooved roll in which two grooves of 3 μm depth are provided at intervals of 58 mm on a roll of 50 mmφ in diameter and 100 mm in length and a flat roll of the same diameter and length. Compression molding was performed by passing between rolls of a press machine. As a result, a negative electrode material having a thickness of 250 μm at the center, a thickness of 252 μm at both ends, and a width of 1 mm at each end was produced. This negative electrode material had a shape as schematically shown in FIG.
【００２５】コバルト酸リチウムとフッ化ビニリデン樹
脂を重量比で９：１になるように混合した後、Ｎ−メチ
ル−２−ピロリドンに分散させた混合材料を作製した。
この混合材料を、厚さ２０μｍ、幅６０ｍｍ、長さ６０
０ｍｍの帯状のアルミ箔上に均一に塗布し、乾燥させた
後、直径５０ｍｍφで長さ１００ｍｍのフラットロール
２本を備えたロールプレス機のロール間に通して圧縮成
形した。その結果、厚さ３００μｍの正極材料を作製し
た。After mixing lithium cobaltate and vinylidene fluoride resin at a weight ratio of 9: 1, a mixed material dispersed in N-methyl-2-pyrrolidone was prepared.
This mixed material was prepared by adding a thickness of 20 μm, a width of 60 mm, and a length of 60 μm.
After being uniformly applied on a 0-mm band-shaped aluminum foil and dried, it was passed through a roll of a roll press equipped with two flat rolls having a diameter of 50 mm and a length of 100 mm, and compression-molded. As a result, a cathode material having a thickness of 300 μm was produced.
【００２６】セパレータにはポリエチレンとポリプロピ
レンを複合した厚さ２５μｍ、気孔率４５％の微多孔膜
を用いた。なお、セパレータは、幅６２ｍｍ、長さ７０
０ｍｍの寸法になるように切断して用いた。As the separator, a microporous film having a thickness of 25 μm and a porosity of 45%, which is a composite of polyethylene and polypropylene, was used. The separator has a width of 62 mm and a length of 70 mm.
It was cut to a size of 0 mm before use.
【００２７】得られたこれらの材料を負極材料、セパレ
ータ、正極材料、セパレータの順に重ね合わせ、捲回装
置にて捲回して、電極複合体を作製した。この捲回型電
極複合体の端面部の巻き固さはその中央部に比べて固く
捲回されていた。The obtained materials were stacked in the order of a negative electrode material, a separator, a positive electrode material, and a separator, and wound by a winding device to produce an electrode composite. The winding hardness of the end face portion of the wound electrode composite was harder than that of the center portion.
【００２８】上記の捲回型電極複合体を、ニッケルメッ
キした鉄製の電池缶に挿入した。電池として必要なその
他の部材（例えば、電池上下の絶縁板やそれぞれの電極
リード体）などは市販の電池に準じて適宜配置した。そ
の後、リチウムイオン電池に、プロピレンカーボネート
と１，２−ジメトキシエタンとを同容量ずつ混合した液
に電解質としてフッ化リンリチウム（ＬｉＰＦ6 ）を１
ｍｏｌ／リットル溶解したものを注入し、電池缶の上面
を閉鎖して２０個の電池を作製した。The above-mentioned wound electrode composite was inserted into a nickel-plated iron battery can. Other members necessary for the battery (for example, insulating plates above and below the battery and respective electrode lead bodies) and the like were appropriately arranged according to a commercially available battery. Then, lithium phosphate (LiPF 6 ) was used as an electrolyte in a liquid obtained by mixing propylene carbonate and 1,2-dimethoxyethane in equal volumes by volume.
The solution dissolved in mol / liter was injected, and the upper surface of the battery can was closed to produce 20 batteries.
【００２９】（実施例２）正極材料は、実施例１におい
て負極作製時に使用した溝付きロールとフラットロール
を用いて圧縮成形し、一方、負極材料は、実施例１にお
いて正極作製時に使用したフラットロール２本により圧
縮成形した。得られた正極材料は、実施例１における負
極材料と同様の形状をしており、中央部の厚さ３００μ
ｍ、両端部の厚さ３０２μｍで各端部の幅が１ｍｍであ
った。一方、負極材料は厚さが２５０μｍで均一であっ
た。これ以外は、実施例１と同様にして、２０個の電池
を作製した。(Example 2) The positive electrode material was compression-molded using the grooved roll and the flat roll used in the preparation of the negative electrode in Example 1, while the negative electrode material was the flat material used in the preparation of the positive electrode in Example 1. Compression molding was performed using two rolls. The obtained positive electrode material has the same shape as the negative electrode material in Example 1, and has a thickness of 300 μm at the center.
m, the thickness at both ends was 302 μm, and the width at each end was 1 mm. On the other hand, the negative electrode material had a uniform thickness of 250 μm. Except for this, 20 batteries were produced in the same manner as in Example 1.
【００３０】（実施例３）正極材料、負極材料ともにフ
ラットロールにより圧縮成形した。一方、セパレータの
長さ７００ｍｍの辺の両方の端部から幅１．５ｍｍの範
囲に、全辺にわたってポリエステル系ホットメルト剤を
塗布し、未塗布部分（中央部）の厚さ２５μｍ、塗布部
（両端部）の厚さ２６．５μｍとした。それ以外は、実
施例１と同様に２０個の電池を作製した。これ以外は、
実施例１と同様にして、２０個の電池を作製した。Example 3 Both the positive electrode material and the negative electrode material were compression-molded using flat rolls. On the other hand, a polyester-based hot-melt agent was applied to both sides of the separator having a length of 700 mm and a width of 1.5 mm over the entire side, and the thickness of the uncoated portion (central portion) was 25 μm, and the coated portion ( The thickness at both ends was 26.5 μm. Otherwise, 20 batteries were manufactured in the same manner as in Example 1. Otherwise,
In the same manner as in Example 1, 20 batteries were produced.
【００３１】（実施例４）セパレータの長さ７００ｍｍ
の辺の両方の端部から幅３ｍｍの範囲に、長さ１００ｍ
ｍにわたって溶媒で溶解したアクリル系樹脂を塗布し、
未塗布部分の厚さ２５μｍ、塗布部の厚さ３０μｍとし
た。なお、塗布部は、捲回を開始する端部から１００ｍ
ｍの部分とした。これ以外は、実施例１と同様にして、
２０個の電池を作製した。(Embodiment 4) Length of a separator 700 mm
100m in length within a range of 3mm in width from both ends of the side
Acrylic resin dissolved with a solvent over m
The thickness of the uncoated portion was 25 μm, and the thickness of the coated portion was 30 μm. In addition, the application part is 100 m from the end to start winding.
m. Except for this, in the same manner as in Example 1,
Twenty batteries were produced.
【００３２】（比較例１）実施例３で用いた正極、負極
と実施例１で用いたセパレータを上記実施例と同様に電
池を２０個作製した。作製した捲回型電極複合体の巻き
固さは全面にわたってほぼ同等であった。なお、捲回時
の各材料のテンションは各実施例、比較例を通じて同じ
である。(Comparative Example 1) Twenty batteries were manufactured using the positive electrode and the negative electrode used in Example 3 and the separator used in Example 1 in the same manner as in the above Example. The wound hardness of the wound electrode assembly thus produced was substantially the same over the entire surface. In addition, the tension of each material at the time of winding is the same throughout each Example and Comparative Example.
【００３３】これらの捲回型電池を上限電圧４．１６Ｖ
で充電を行い、２５℃の雰囲気下で１週間放置した後に
電池電圧を測定した。そして、電池電圧が４．０Ｖ以下
になるものを不良としてその個数をカウントした。結果
を表にまとめて示す。These wound type batteries were operated at an upper limit voltage of 4.16V.
And left for 1 week in an atmosphere of 25 ° C., and then the battery voltage was measured. Then, the battery whose battery voltage became 4.0 V or less was regarded as defective, and the number thereof was counted. The results are shown in a table.
【００３４】[0034]
【表１】 [Table 1]
【００３５】なお、表中、かっこ内の数字は、端部の厚
さを示す。また、前記各実施例、比較例において、捲回
の際の巻きずれは発生しなかった。In the table, the numbers in parentheses indicate the thickness of the end. In each of the above Examples and Comparative Examples, no winding deviation occurred during winding.
【００３６】[0036]
【発明の効果】本発明の捲回型電池によれば、帯状の正
極、負極およびセパレータの少なくとも一つを所定の形
状に加工するという簡便な手段により正負極間の短絡を
防止することができる。According to the wound type battery of the present invention, a short circuit between the positive and negative electrodes can be prevented by a simple means of processing at least one of the strip-shaped positive electrode, negative electrode and separator into a predetermined shape. .
【００３７】また、この凸部を捲回とともに渦巻き模様
を形成する端辺部に設けることにより、凸部を設け短絡
を防止しても電池反応を均一に行わせることができる。
さらに、凸部を捲回が開始される端辺部に設けることに
より、捲回時の巻きずれを効果的に防止することができ
る。Further, by providing the convex portion at the end portion where the spiral pattern is formed together with the winding, even if the convex portion is provided to prevent a short circuit, the battery reaction can be performed uniformly.
Further, by providing the convex portion at the end portion where the winding starts, it is possible to effectively prevent the winding deviation at the time of winding.
【００３８】凸部が設けられた正極、負極およびセパレ
ータにおける前記凸部の厚さを、この凸部以外の部分の
厚さを１として、１．００５〜６の範囲とすることによ
り、極材やセパレータの厚さのばらつきに影響されず、
また、電池容量を低下させるなどの弊害を招くことなく
本発明の前記効果を得ることができる。また、凸部が設
けられた正極、負極およびセパレータにおける前記凸部
の面積が、この凸部以外の部分の面積を１として、０．
００５〜０．３の範囲とすることにより、凸部以外の部
分での圧力の緩和を十分に図り、本発明の効果を得るこ
とができる。By setting the thickness of the projections in the positive electrode, the negative electrode, and the separator provided with the projections in the range of 1.005 to 6 with respect to the thickness of the portion other than the projections as 1, And the thickness of the separator does not affect
Further, the above-described effects of the present invention can be obtained without causing any adverse effects such as a decrease in battery capacity. Further, the area of the convex portion in the positive electrode, the negative electrode, and the separator provided with the convex portion is set to 0.
When the content is in the range of 005 to 0.3, the pressure at portions other than the convex portions can be sufficiently relaxed, and the effect of the present invention can be obtained.
【図１】 本発明の一実施例の捲回型電池に用いられる
負極部材の形状を示す図である。FIG. 1 is a view showing the shape of a negative electrode member used in a wound type battery according to one embodiment of the present invention.
【図２】 本発明の一実施例の捲回型電池に用いられる
捲回型電極の断面図である。FIG. 2 is a cross-sectional view of a wound electrode used in the wound battery according to one embodiment of the present invention.
【図３】 一般的な捲回型電池の断面斜視図である。FIG. 3 is a sectional perspective view of a general wound type battery.
１ 負極 ２ 正極 ３ セパレータ ４ 電解液 ５ 電池缶 Reference Signs List 1 negative electrode 2 positive electrode 3 separator 4 electrolyte 5 battery can
Claims (5)
層し捲回した電極を備えた捲回型電池において、前記正
極、負極およびセパレータの少なくとも一つが積層方向
に凸部を有することを特徴とする捲回型電池。1. A wound type battery including an electrode formed by laminating and winding a strip-shaped positive electrode, a negative electrode, and a separator, wherein at least one of the positive electrode, the negative electrode, and the separator has a convex portion in a laminating direction. Wound battery.
る端辺部に設けられた請求項１に記載の捲回型電池。2. The wound type battery according to claim 1, wherein the convex portion is provided at an end portion forming a spiral pattern together with the winding.
れた請求項１または２に記載の捲回型電池。3. The wound type battery according to claim 1, wherein the convex portion is provided at an end portion where winding is started.
レータにおいて、前記凸部が設けられた部分の厚さが、
この凸部以外の部分の厚さを１として、１．００５〜６
である請求項１〜３のいずれか一つに記載の捲回型電
池。4. In a positive electrode, a negative electrode and a separator provided with a convex portion, a thickness of a portion provided with the convex portion is:
Assuming that the thickness of the portion other than the convex portion is 1, 1.005 to 6
The wound type battery according to claim 1, wherein
レータにおいて、前記凸部が設けられた部分の面積が、
この凸部以外の部分の面積を１として、０．００５〜
０．３である請求項１〜４のいずれか一つに記載の捲回
型電池。5. In the positive electrode, the negative electrode, and the separator provided with the protrusion, the area of the portion provided with the protrusion is:
Assuming that the area of the portion other than the convex portion is 1, 0.005 to
The wound type battery according to any one of claims 1 to 4, wherein the value is 0.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9060995A JPH10255818A (en) | 1997-03-14 | 1997-03-14 | Wound battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9060995A JPH10255818A (en) | 1997-03-14 | 1997-03-14 | Wound battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10255818A true JPH10255818A (en) | 1998-09-25 |
Family
ID=13158534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9060995A Pending JPH10255818A (en) | 1997-03-14 | 1997-03-14 | Wound battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10255818A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20020051829A (en) * | 2000-12-22 | 2002-06-29 | 다카노 야스아키 | Nonaqueous electrolyte secondary battery |
| JP2003109574A (en) * | 2001-09-28 | 2003-04-11 | Sanyo Electric Co Ltd | Nonaqueous electrolyte secondary battery |
| WO2005117167A1 (en) * | 2004-05-25 | 2005-12-08 | Matsushita Electric Industrial Co., Ltd. | Lithium ion secondary battery and method for manufacturing same |
| JP2012181922A (en) * | 2011-02-28 | 2012-09-20 | Hitachi Vehicle Energy Ltd | Battery cell using coating-type electrode group |
| JP2012209072A (en) * | 2011-03-29 | 2012-10-25 | Nec Corp | Electrode laminate of electrode laminated battery and manufacturing method of the electrode laminate |
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1997
- 1997-03-14 JP JP9060995A patent/JPH10255818A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020051829A (en) * | 2000-12-22 | 2002-06-29 | 다카노 야스아키 | Nonaqueous electrolyte secondary battery |
| JP2003109574A (en) * | 2001-09-28 | 2003-04-11 | Sanyo Electric Co Ltd | Nonaqueous electrolyte secondary battery |
| WO2005117167A1 (en) * | 2004-05-25 | 2005-12-08 | Matsushita Electric Industrial Co., Ltd. | Lithium ion secondary battery and method for manufacturing same |
| US7875391B2 (en) | 2004-05-25 | 2011-01-25 | Panasonic Corporation | Lithium ion secondary battery and method for manufacturing same |
| KR101321201B1 (en) * | 2010-02-05 | 2013-10-23 | 도요타지도샤가부시키가이샤 | Electrode body for use in non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery |
| JP2012181922A (en) * | 2011-02-28 | 2012-09-20 | Hitachi Vehicle Energy Ltd | Battery cell using coating-type electrode group |
| JP2012209072A (en) * | 2011-03-29 | 2012-10-25 | Nec Corp | Electrode laminate of electrode laminated battery and manufacturing method of the electrode laminate |
| KR101367975B1 (en) * | 2011-11-15 | 2014-03-14 | (주)오렌지파워 | Electrode assembly, method of manufacturing the same, and battery having the same |
| WO2013128793A1 (en) * | 2012-02-29 | 2013-09-06 | パナソニック株式会社 | Battery electrode plate, manufacturing method for same, electrode plate group having said electrode plate, and lead-acid battery |
| JP5325358B1 (en) * | 2012-02-29 | 2013-10-23 | パナソニック株式会社 | ELECTRODE FOR BATTERY AND METHOD FOR MANUFACTURING THE SAME |
| JP2014082070A (en) * | 2012-10-15 | 2014-05-08 | Lithium Energy Japan:Kk | Electricity storage device |
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