JPH11265706A - Battery - Google Patents
BatteryInfo
- Publication number
- JPH11265706A JPH11265706A JP10087918A JP8791898A JPH11265706A JP H11265706 A JPH11265706 A JP H11265706A JP 10087918 A JP10087918 A JP 10087918A JP 8791898 A JP8791898 A JP 8791898A JP H11265706 A JPH11265706 A JP H11265706A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- electrode material
- positive electrode
- electrode
- current collector
- 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
【０００１】[0001]
【発明の属する技術分野】本発明は、集電体の両面に電
極材料を塗布した正極電極と負極電極をセパレータを介
して巻回することにより巻回型の発電要素を形成したリ
チウムイオン電池等の電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion battery and the like in which a positive electrode and a negative electrode each having an electrode material applied to both surfaces of a current collector are wound through a separator to form a wound power generating element. Battery.
【０００２】[0002]
【従来の技術】リチウムイオン電池の巻回型の発電要素
１は、図３に示すように、正極電極２と負極電極３をセ
パレータ４を介して巻回することにより作成される。正
極電極２は、図４に示すように、帯状のアルミニウム箔
からなる正極集電体２ａの両面に正極電極材料２ｂを塗
布したものであり、巻き始めの部分には正極電極材料２
ｂを両面ともに塗布しない両面未塗工部を設けて、ここ
にタブリード５を接続固定している。また、負極電極３
は、帯状の銅箔からなる負極集電体３ａの両面に負極電
極材料３ｂを塗布したものであり、巻き終わりの部分に
負極電極材料３ｂを両面ともに塗布しない両面未塗工部
を設けて、ここにタブリード６を接続固定している。タ
ブリード５，６は、正極集電体２ａや負極集電体３ａに
重ね合わせてヘッドで両側から押さえ込んで超音波溶接
により接続固定するので、正極集電体２ａや負極集電体
３ａの接続固定部には両面とも正極電極材料２ｂや負極
電極材料３ｂを塗布しない両面未塗工部を設ける必要が
ある。セパレータ４は、正極電極２と負極電極３とを巻
回する際に、これらの間を絶縁するためのイオン透過性
多孔質の合成樹脂フィルムである。2. Description of the Related Art As shown in FIG. 3, a winding type power generating element 1 of a lithium ion battery is formed by winding a positive electrode 2 and a negative electrode 3 with a separator 4 interposed therebetween. As shown in FIG. 4, the positive electrode 2 has a structure in which a positive electrode material 2b is applied to both surfaces of a positive electrode current collector 2a made of a strip-shaped aluminum foil.
A tab lead 5 is connected and fixed to a double-sided uncoated portion where b is not applied to both surfaces. In addition, the negative electrode 3
Is a negative electrode current collector 3a made of a strip-shaped copper foil coated with a negative electrode material 3b on both surfaces, and provided with a double-sided uncoated portion where the negative electrode material 3b is not coated on both surfaces at the end of winding, Here, the tab lead 6 is connected and fixed. The tab leads 5, 6 are superimposed on the positive electrode current collector 2a and the negative electrode current collector 3a, pressed down from both sides with a head, and connected and fixed by ultrasonic welding, so that the connection of the positive electrode current collector 2a and the negative electrode current collector 3a is fixed. It is necessary to provide a double-sided uncoated portion in which the positive electrode material 2b and the negative electrode material 3b are not applied to both sides. The separator 4 is an ion-permeable porous synthetic resin film for insulating the positive electrode 2 and the negative electrode 3 when winding the same.
【０００３】上記セパレータ４は、図３及び図５に示す
巻芯７のスリットに挿入され、この状態で巻芯７を回転
させることにより２条の帯状として巻回される。また、
正極電極２と負極電極３は、これらのセパレータ４の間
に挟み込むことにより巻回される。The separator 4 is inserted into a slit of the core 7 shown in FIGS. 3 and 5, and is wound as a two-strip by rotating the core 7 in this state. Also,
The positive electrode 2 and the negative electrode 3 are wound by being sandwiched between these separators 4.
【０００４】ここで、リチウムイオン電池は、正極電極
２の正極電極材料２ｂがセパレータ４を介して必ず負極
電極３の負極電極材料３ｂと向かい合っていなければな
らない。即ち、正極電極２の正極電極材料２ｂが負極電
極３の負極電極材料３ｂと向かい合っていない場合に
は、充電時にこの正極電極材料２ｂから移動するイオン
化金属がセパレータ４を介して向かい合う電池内の金属
部分に樹枝状に結晶して析出するので、この樹枝状の結
晶がセパレータ４を貫通して内部短絡を引き起こすおそ
れがある。このため、負極電極３は、正極電極２よりも
少し幅広に形成して、これらをセパレータ４を介して巻
回した際に負極電極材料３ｂの塗工部が正極電極材料２
ｂの塗工部を確実に覆うようにしている。また、発電要
素１の巻回の際にも、図５に示すように、正極電極２の
巻き始めにおける正極電極材料２ｂの塗工開始部よりも
内側に、巻き始めから負極電極材料３ｂが塗布された負
極電極３が配置されるようにすると共に、最も外側の部
分も、巻き終わりまで正極電極材料２ｂが塗布された正
極電極２の周囲を負極電極３の負極電極材料３ｂを塗布
した塗工部が完全に覆うようにしている。Here, in the lithium ion battery, the positive electrode material 2b of the positive electrode 2 must always face the negative electrode material 3b of the negative electrode 3 via the separator 4. That is, when the positive electrode material 2b of the positive electrode 2 does not face the negative electrode material 3b of the negative electrode 3, the ionized metal that moves from the positive electrode material 2b during charging faces the metal in the battery that faces through the separator 4 during charging. Since dendritic crystals are formed and precipitated in the portions, the dendritic crystals may penetrate the separator 4 and cause an internal short circuit. Therefore, the negative electrode 3 is formed to be slightly wider than the positive electrode 2, and when these are wound through the separator 4, the coated portion of the negative electrode material 3 b
The coating part of b is surely covered. Also, when the power generating element 1 is wound, as shown in FIG. 5, the negative electrode material 3b is applied to the inside of the coating start portion of the positive electrode material 2b at the start of winding of the positive electrode 2 from the start of winding. The coated negative electrode 3 is arranged, and the outermost portion is also coated with the negative electrode material 3b of the negative electrode 3 around the positive electrode 2 coated with the positive electrode material 2b until the end of winding. The part is completely covered.
【０００５】[0005]
【発明が解決しようとする課題】ところが、上記従来の
リチウムイオン電池は、負極集電体３ａの両面の同じ位
置に負極電極材料３ｂを塗布していたので、負極電極３
における負極集電体３ａの内周面に塗布された負極電極
材料３ｂが、巻き始めからほぼ１周分にわたって正極電
極２の正極電極材料２ｂに向かい合うことがなくなり、
この部分が発電に関与することなく無駄にスペースを占
有するため、電池の容積に対する電池容量の割合を減少
させるという問題があった。However, in the above-mentioned conventional lithium ion battery, the negative electrode material 3b is applied to the same position on both surfaces of the negative electrode current collector 3a.
The negative electrode material 3b applied to the inner peripheral surface of the negative electrode current collector 3a in the above does not face the positive electrode material 2b of the positive electrode 2 for almost one round from the beginning of winding,
Since this portion occupies a space unnecessarily without being involved in power generation, there is a problem in that the ratio of the battery capacity to the battery volume is reduced.
【０００６】また、負極電極３における負極集電体３ａ
の外周面に塗布された負極電極材料３ｂも、最も外側の
ほぼ１周分にわたって正極電極２の正極電極材料２ｂに
向かい合うことがなくなり、この部分が発電に関与する
ことなく無駄にスペースを占有するため、電池の容積に
対する電池容量の割合を減少させるという問題があっ
た。Further, the negative electrode current collector 3a in the negative electrode 3
Of the negative electrode material 3b applied to the outer peripheral surface of the positive electrode 2 does not face the positive electrode material 2b of the positive electrode 2 for almost one outermost circumference, and this portion occupies a wasteful space without being involved in power generation. Therefore, there is a problem that the ratio of the battery capacity to the battery volume is reduced.
【０００７】なお、上記従来例では、リチウムイオン電
池の負極電極３に無駄が生じる場合について説明した
が、他の電池の場合には、正極電極に無駄が生じる場合
もあり得る。In the above-mentioned conventional example, the case where the negative electrode 3 of the lithium ion battery is wasted has been described. However, in the case of another battery, the positive electrode may be wasted.
【０００８】本発明は、かかる事情に鑑みてなされたも
のであり、いずれか一方の電極の巻き始めの部分に、内
周面側にのみほぼ１周分にわたって電極材料の未塗工部
を設けることにより、電池容量を増加させることができ
る電池を提供することを目的としている。The present invention has been made in view of the above circumstances, and an uncoated portion of the electrode material is provided on the inner peripheral surface side of the one of the electrodes at the beginning of winding over substantially one turn. Accordingly, it is an object of the present invention to provide a battery capable of increasing the battery capacity.
【０００９】[0009]
【課題を解決するための手段】請求項１の発明は、集電
体の両面に電極材料を塗布した正極電極と負極電極をセ
パレータを介して巻回することにより巻回型の発電要素
を形成した電池において、正極電極又は負極電極のう
ち、電極材料の塗工部が発電要素の最も内側に配置され
る電極に、集電体の外周面の塗工開始部からほぼ１周分
にわたって、その裏側の内周面に電極材料を塗布しない
未塗工部が設けられたことを特徴とする。According to the first aspect of the present invention, a wound power generating element is formed by winding a positive electrode and a negative electrode, each having an electrode material coated on both surfaces of a current collector, through a separator. In the battery, the coated portion of the electrode material, of the positive electrode or the negative electrode, is applied to the electrode disposed on the innermost side of the power generation element, for approximately one round from the coating start portion on the outer peripheral surface of the current collector. An uncoated portion where no electrode material is applied is provided on the inner peripheral surface on the back side.
【００１０】請求項１によれば、一方の電極における集
電体の内周面に、この外周面の電極材料の塗工開始部か
らほぼ１周分にわたって、電極材料を塗布しない未塗工
部が設けられるので、他方の電極の塗工部がこの一方の
電極の外周面の塗工開始部付近の外周から巻回されるよ
うにすれば、一方の電極の電極材料が他方の電極の電極
材料に向かい合わないという部分がほとんどなくなり、
無駄な電極材料がスペースを占有することにより電池容
量が減少するのを防ぐことができる。According to the first aspect, the uncoated portion where the electrode material is not applied to the inner peripheral surface of the current collector of one of the electrodes for approximately one turn from the start of the application of the electrode material on the outer peripheral surface. Is provided, so that the coating portion of the other electrode is wound from the outer periphery near the coating start portion on the outer peripheral surface of the one electrode, so that the electrode material of one electrode becomes the electrode material of the other electrode. There is almost no part that does not face the material,
It is possible to prevent the battery capacity from decreasing due to useless electrode material occupying the space.
【００１１】なお、塗工開始部とは、電極を巻き始め側
から辿った場合に電極材料の塗布が始まる部分をいい、
必ずしも実際に電極材料の塗布工程で塗布を開始した側
の部分とは限らない。The coating start portion means a portion where the application of the electrode material starts when the electrode is traced from the winding start side.
It is not necessarily the part on the side where the application was actually started in the electrode material application step.
【００１２】請求項２の発明は、前記正極電極又は負極
電極のうち、電極材料の塗工部が発電要素の最も外側に
配置される電極に、集電体の内周面の塗工終了部までの
ほぼ１周分にわたって、その裏側の外周面に電極材料を
塗布しない未塗工部が設けられたことを特徴とする。[0012] The invention according to claim 2 is that, among the positive electrode or the negative electrode, a coating portion of an electrode material is applied to an electrode disposed on the outermost side of the power generation element, and a coating end portion of the inner peripheral surface of the current collector is provided. An uncoated portion where the electrode material is not applied is provided on the outer peripheral surface on the back side for approximately one round.
【００１３】請求項２によれば、一方の電極における集
電体の外周面に、この内周面の電極材料の塗工終了部ま
でのほぼ１周分にわたって、電極材料を塗布しない未塗
工部が設けられるので、他方の電極の塗工部がこの一方
の電極の内周面の塗工終了部付近の内側まで巻回される
ようにすれば、発電要素の外側においても、一方の電極
の電極材料が他方の電極の電極材料に向かい合わないと
いう部分がほとんどなくなり、無駄な電極材料がスペー
スを占有することにより電池容量が減少するのを防ぐこ
とができる。According to the second aspect, the uncoated electrode material is not coated on the outer peripheral surface of the current collector of one of the electrodes over substantially one turn until the coating of the inner peripheral surface with the electrode material is completed. Is provided, so that the coating portion of the other electrode is wound around the inside of the coating end portion of the inner peripheral surface of the one electrode, so that one electrode can be formed outside the power generating element. There is almost no portion where the electrode material does not face the electrode material of the other electrode, and it is possible to prevent the useless electrode material from occupying a space and reducing the battery capacity.
【００１４】なお、塗工終了部とは、電極を巻き始め側
から辿った場合に電極材料の塗布が終わる部分をいい、
必ずしも実際に電極材料の塗布工程で塗布を終了した側
の部分とは限らない。The term "coating end portion" means a portion where the application of the electrode material ends when the electrode is traced from the winding start side.
It is not necessarily the part on the side where the application is actually finished in the electrode material application step.
【００１５】請求項３の発明は、前記電池がリチウムイ
オン電池であり、前記塗工部の裏側に未塗工部を設ける
電極が負極電極であることを特徴とする。According to a third aspect of the present invention, the battery is a lithium ion battery, and the electrode provided with the uncoated portion on the back side of the coated portion is a negative electrode.
【００１６】請求項３によれば、リチウムイオン電池の
負極電極の電極材料を無駄なくしかも確実に正極電極の
電極材料と向かい合わせることができるようになる。According to the third aspect, the electrode material of the negative electrode of the lithium ion battery can be efficiently and reliably opposed to the electrode material of the positive electrode.
【００１７】[0017]
【発明の実施の形態】以下、本発明の実施形態について
図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１８】図１〜図２は本発明の一実施形態を示すも
のであって、図１は巻回型の発電要素の構造を示す平面
図、図２は巻回する正極電極と負極電極とセパレータの
構成を示す縦断面図である。なお、図３〜図５に示した
従来例と同様の機能を有する構成部材には同じ番号を付
記する。1 and 2 show one embodiment of the present invention. FIG. 1 is a plan view showing the structure of a wound type power generating element, and FIG. 2 is a plan view showing a wound positive electrode and a negative electrode. It is a longitudinal cross-sectional view which shows the structure of a separator. Components having the same functions as those of the conventional example shown in FIGS. 3 to 5 are denoted by the same reference numerals.
【００１９】本実施形態では、従来例と同様のリチウム
イオン電池について説明する。このリチウムイオン電池
の発電要素１は、図３に示したように、正極電極２と負
極電極３をセパレータ４を介して巻回することにより作
成される。正極電極２は、図２に示すように、帯状のア
ルミニウム箔からなる正極集電体２ａの両面に正極電極
材料２ｂを塗布したものであり、この正極集電体２ａの
巻き始めの部分には、正極電極材料２ｂを両面ともに塗
布しない両面未塗工部を設けて、この部分に短冊状のア
ルミニウム薄板からなるタブリード５を接続固定してい
る。また、この正極電極２の巻き終わりは、正極集電体
２ａの両面とも正極電極材料２ｂが終端まで塗布されて
いる。従って、この正極電極２は、従来と同様に、正極
集電体２ａの両面の同じ位置に正極電極材料２ｂが塗布
されている。In this embodiment, a lithium ion battery similar to the conventional example will be described. The power generating element 1 of this lithium ion battery is produced by winding a positive electrode 2 and a negative electrode 3 via a separator 4 as shown in FIG. As shown in FIG. 2, the positive electrode 2 is formed by coating a positive electrode material 2b on both surfaces of a positive electrode current collector 2a made of a strip-shaped aluminum foil. In addition, a double-sided uncoated portion where both surfaces are not coated with the positive electrode material 2b is provided, and a tab lead 5 made of a strip-shaped aluminum thin plate is connected and fixed to this portion. At the end of the winding of the positive electrode 2, the positive electrode material 2 b is applied to both ends of the positive electrode current collector 2 a to the end. Therefore, the positive electrode material 2b is applied to the positive electrode 2 at the same position on both surfaces of the positive electrode current collector 2a, as in the related art.
【００２０】負極電極３も、従来と同様に、帯状の銅箔
からなる負極集電体３ａの両面に負極電極材料３ｂを塗
布したものである。しかし、本実施形態では、この負極
集電体３ａの巻き始めの部分の外周面（図示下向き面）
には始端まで負極電極材料３ｂを塗布しているが、内周
面（図示上向き面）には巻回のほぼ１周分の長さにわた
って負極電極材料３ｂを塗布しない未塗工部３ｃを設け
ている。また、負極集電体３ａの巻き終わりの部分の内
周面には終端に近い部分まで負極電極材料３ｂを塗布し
ているが、外周面には巻回の１周分よりも少し長くにわ
たって負極電極材料３ｂを塗布しない未塗工部３ｄを設
けている。そして、この未塗工部３ｄの終端付近には、
短冊状のアルミニウム薄板からなるタブリード５を接続
固定している。なお、この負極集電体３ａの終端近くの
部分を、負極電極材料３ｂが両面ともに塗布されない両
面未塗工部としているのは、従来と同様に、ここにタブ
リード６を超音波溶接により接続固定するためである。The negative electrode 3 is also formed by applying a negative electrode material 3b to both surfaces of a negative electrode current collector 3a made of a strip-shaped copper foil, as in the prior art. However, in the present embodiment, the outer peripheral surface (the downward facing surface in the figure) of the portion at the beginning of winding of the negative electrode current collector 3a.
Is coated with the negative electrode material 3b up to the start end, but an uncoated portion 3c where the negative electrode material 3b is not applied is provided on the inner peripheral surface (upward facing surface in the drawing) for a length of substantially one turn of the winding. ing. Further, the negative electrode material 3b is applied to the inner peripheral surface at the end of the winding of the negative electrode current collector 3a up to the portion near the terminal end, but the negative electrode extends over the outer peripheral surface for a little longer than one turn of the winding. An uncoated portion 3d to which the electrode material 3b is not applied is provided. And, near the end of the uncoated portion 3d,
A tab lead 5 made of a strip-shaped aluminum thin plate is connected and fixed. The portion near the end of the negative electrode current collector 3a is a double-sided uncoated portion on which both surfaces of the negative electrode material 3b are not applied. As in the conventional case, the tab lead 6 is connected and fixed thereto by ultrasonic welding. To do that.
【００２１】上記正極電極２や負極電極３は、まず長尺
な帯状の正極集電体２ａや負極集電体３ａをリールから
順次繰り出しながら、一方の面に所定の間隔で正極電極
材料２ｂや負極電極材料３ｂを塗布し乾燥させる。次
に、これを一旦別のリールに巻き取った後に、このリー
ルから再び長尺な帯状の正極集電体２ａや負極集電体３
ａを順次繰り出しながら、他方の面に所定の間隔で正極
電極材料２ｂや負極電極材料３ｂを塗布し乾燥させる。
そして、これら正極電極材料２ｂや負極電極材料３ｂを
プレスして圧縮し、正極集電体２ａや負極集電体３ａを
所定の長さごとに切断することにより正極電極２や負極
電極３が製造される。この際、正極電極２の場合には、
一方の面に塗布された正極電極材料２ｂの位置を検出し
て、他方の面の同じ位置に正極電極材料２ｂを塗布すれ
ばよい。しかし、負極電極３の場合には、一方の面に塗
布された負極電極材料３ｂの位置を検出することによ
り、他方の面には位置を所定距離だけずらして負極電極
材料３ｂを塗布するようにしなければならない。The positive electrode 2 and the negative electrode 3 are formed by first feeding a long strip-shaped positive electrode current collector 2a and a negative electrode current collector 3a sequentially from a reel and forming a positive electrode material 2b on one surface at a predetermined interval. The negative electrode material 3b is applied and dried. Next, after this is once wound on another reel, a long strip-shaped positive electrode current collector 2a or a negative electrode current collector 3 is again taken out from this reel.
While sequentially feeding out a, the positive electrode material 2b and the negative electrode material 3b are applied to the other surface at predetermined intervals and dried.
Then, the positive electrode material 2b and the negative electrode material 3b are pressed and compressed, and the positive electrode current collector 2a and the negative electrode current collector 3a are cut into predetermined lengths, whereby the positive electrode electrode 2 and the negative electrode electrode 3 are manufactured. Is done. At this time, in the case of the positive electrode 2,
The position of the positive electrode material 2b applied to one surface may be detected, and the positive electrode material 2b may be applied to the same position on the other surface. However, in the case of the negative electrode 3, by detecting the position of the negative electrode material 3b applied to one surface, the position is shifted by a predetermined distance on the other surface so that the negative electrode material 3b is applied. There must be.
【００２２】本実施形態では、正極電極材料２ｂとし
て、コバルト酸リチウム、リチウム・ニッケル酸素又は
リチウム・マンガン系等の正極活物質にバインダ等を混
合したものを用いる。また、負極電極材料３ｂには、カ
ーボン系等の負極活物質にバインダ等を混合したものを
用いる。さらに、セパレータ４としては、イオン透過性
多孔質のポリエチレン・フィルムや、ポリプロピレンの
層の間にこのポリエチレンの層を介在させた３層構造の
イオン透過性多孔質のフィルムを用いる。ただし、本発
明は、これらの材質を限定するものではない。In this embodiment, as the positive electrode material 2b, a material obtained by mixing a binder or the like with a positive electrode active material such as lithium cobalt oxide, lithium nickel oxygen, or lithium manganese is used. As the negative electrode material 3b, a material obtained by mixing a binder or the like with a carbon-based negative electrode active material is used. Further, as the separator 4, an ion-permeable porous polyethylene film or a three-layered ion-permeable porous film having a layer of polyethylene interposed between layers of polypropylene is used. However, the present invention does not limit these materials.
【００２３】上記セパレータ４は、図１に示す巻芯７の
スリットに挿入され、この状態で巻芯７を回転させるこ
とにより２条の帯状として巻回される。この際、まず正
極電極２の巻き始めの両面未塗工部がタブリード５と共
にこれらのセパレータ４の間に挟み込まれて巻回され
る。そして、この正極電極２における正極集電体２ａの
両面に正極電極材料２ｂが塗布された塗工開始部が巻回
される直前に、その内側にセパレータ４を介して負極電
極３の巻き始め部分が挟み込まれて巻回される。する
と、この負極電極３の外周面の負極電極材料３ｂは、セ
パレータ４を介して外側の正極電極２の内周面の正極電
極材料２ｂと向かい合うことになる。また、この負極電
極３の内周面の負極電極材料３ｂも、セパレータ４を介
して内側の正極電極２の外周面の正極電極材料２ｂと向
かい合うことになる。しかも、この負極電極３の内周面
の巻き始め部分は、巻回のほぼ１周分だけ負極電極材料
３ｂが塗布されない未塗工部３ｃとなるが、この内側に
は正極電極２の両面未塗工部のみが向かい合うので、こ
こに負極電極材料３ｂが無駄に配置されるようなことが
なくなる。The separator 4 is inserted into a slit of the core 7 shown in FIG. 1, and is wound as a two-strip by rotating the core 7 in this state. At this time, the uncoated portion on both sides at the beginning of winding of the positive electrode 2 is sandwiched between these separators 4 together with the tab lead 5 and wound. Immediately before the coating start portion in which the positive electrode material 2b is applied to both surfaces of the positive electrode current collector 2a in the positive electrode 2 is wound, a winding start portion of the negative electrode 3 with a separator 4 inside the coating start portion. Is sandwiched and wound. Then, the negative electrode material 3 b on the outer peripheral surface of the negative electrode 3 faces the positive electrode material 2 b on the inner peripheral surface of the outer positive electrode 2 via the separator 4. The negative electrode material 3b on the inner peripheral surface of the negative electrode 3 also faces the positive electrode material 2b on the outer peripheral surface of the inner positive electrode 2 via the separator 4. In addition, the winding start portion of the inner peripheral surface of the negative electrode 3 is an uncoated portion 3c to which the negative electrode material 3b is not applied for almost one turn of the winding. Since only the coating portions face each other, the negative electrode material 3b is not disposed wastefully here.
【００２４】上記巻回によって正極電極２が巻き終わり
部分まで全て巻回されると、負極電極３がセパレータ４
を介してさらにその外側をほぼ１周分だけ覆うように巻
回される。すると、この負極電極３の内周面の負極電極
材料３ｂは、セパレータ４を介して内側の正極電極２の
外周面の正極電極材料２ｂと向かい合うことになる。し
かも、この負極電極３の外周面の巻き終わり部分は、巻
回の１周分よりも少し長くにわたって負極電極材料３ｂ
が塗布されない未塗工部３ｄとなるが、この外側にはも
はや正極電極２が巻回されないので、ここに負極電極材
料３ｂが無駄に配置されるようなこともなくなる。When the positive electrode 2 is completely wound to the end portion by the above winding, the negative electrode 3 is
Is wound so as to further cover the outside by substantially one turn. Then, the negative electrode material 3 b on the inner peripheral surface of the negative electrode 3 faces the positive electrode material 2 b on the outer peripheral surface of the inner positive electrode 2 via the separator 4. In addition, the winding end portion of the outer peripheral surface of the negative electrode 3 extends over a little longer than one turn of the negative electrode material 3b.
However, since the positive electrode 2 is no longer wound around the uncoated portion 3d, the negative electrode material 3b is not disposed wastefully.
【００２５】そして、負極電極３の巻回が終了し終端近
くのタブリード６も巻き込まれると、さらにこの外側を
覆うようにセパレータ４を巻回した後に、図示しない巻
き止めテープで止めて発電要素１を完成する。また、こ
の発電要素１を図示しない電池缶に収納し、タブリード
５，６をそれぞれ正負極の端子に接続して非水電解液を
注入し密閉すれば、本実施形態のリチウムイオン電池が
完成する。When the winding of the negative electrode 3 is completed and the tab lead 6 near the end is also wound, the separator 4 is further wound so as to cover the outside, and then stopped with a winding tape (not shown). To complete. When the power generating element 1 is housed in a battery can (not shown), the tab leads 5 and 6 are respectively connected to the positive and negative terminals, and a non-aqueous electrolyte is injected and sealed, whereby the lithium ion battery of the present embodiment is completed. .
【００２６】上記構成のリチウムイオン電池によれば、
負極電極３の巻き始め部分の内周面に負極電極材料３ｂ
が塗布されない未塗工部３ｃが設けられるので、正極電
極２の正極電極材料２ｂと向かい合わないこの未塗工部
３ｃに負極電極材料３ｂが塗布される無駄をなくすこと
ができる。また、負極電極３の巻き終わり部分の外周面
にも負極電極材料３ｂが塗布されない未塗工部３ｄが設
けられるので、正極電極２の正極電極材料２ｂと向かい
合わないこの未塗工部３ｄに負極電極材料３ｂが塗布さ
れる無駄をなくすことができる。従って、これら未塗工
部３ｃ，３ｄによって発電要素１の巻回スペースの無駄
がなくなるので、その分だけ巻回数を増やして電池容量
を増加させることができるようになる。しかも、正極電
極２の両面の正極電極材料２ｂは、必ずセパレータ４を
介して負極電極３の負極電極材料３ｂと向かい合うの
で、イオン化金属が樹枝状に結晶析出するようなおそれ
も生じない。According to the lithium ion battery having the above structure,
A negative electrode material 3b is formed on the inner peripheral surface of the winding start portion of the negative electrode 3.
Since the uncoated portion 3c to which is not applied is provided, the waste of applying the negative electrode material 3b to the uncoated portion 3c that does not face the positive electrode material 2b of the positive electrode 2 can be eliminated. In addition, since the uncoated portion 3d to which the negative electrode material 3b is not applied is provided also on the outer peripheral surface of the winding end portion of the negative electrode 3, the negative electrode 3d which does not face the positive electrode material 2b of the positive electrode 2 is provided. The waste of applying the electrode material 3b can be eliminated. Therefore, the winding space of the power generation element 1 is not wasted by the uncoated portions 3c and 3d, and the battery capacity can be increased by increasing the number of windings. In addition, since the positive electrode material 2b on both surfaces of the positive electrode 2 always faces the negative electrode material 3b of the negative electrode 3 via the separator 4, there is no possibility that the ionized metal precipitates in a dendritic manner.
【００２７】なお、上記実施形態では、負極電極３の巻
き終わり部分にも未塗工部３ｄを設ける場合について説
明したが、巻き始め部分に未塗工部３ｃを設けるだけで
も、巻回スペースの無駄をなくし電池容量を増加させる
ことができる。In the above-described embodiment, the case where the uncoated portion 3d is provided at the winding end portion of the negative electrode 3 has been described. Waste can be eliminated and the battery capacity can be increased.
【００２８】また、上記実施形態では、リチウムイオン
電池の負極電極３に未塗工部３ｃ等を設ける場合につい
て説明したが、正極電極２側に未塗工部を設けることも
可能である。ただし、この場合にも、正極電極２の正極
電極材料２ｂは、必ず負極電極３の負極電極材料３ｂと
向かい合うようにする必要がある。In the above embodiment, the case where the uncoated portion 3c and the like are provided on the negative electrode 3 of the lithium ion battery has been described. However, the uncoated portion can be provided on the positive electrode 2 side. However, also in this case, the positive electrode material 2b of the positive electrode 2 must necessarily face the negative electrode material 3b of the negative electrode 3.
【００２９】さらに、上記実施形態では、リチウムイオ
ン電池について説明したが、巻回型の発電要素を備えた
電池一般にも同様に実施可能である。Further, in the above embodiment, a lithium ion battery has been described. However, the present invention can be similarly applied to a battery having a wound type power generating element.
【００３０】[0030]
【発明の効果】以上の説明から明らかなように、本発明
の電池によれば、発電要素の中心部で正負の電極の電極
材料が確実に向かい合うようにすることができるので、
いずれかの電極の電極材料が無駄にスペースを占有する
ようなことがなくなり、電池容量を増加させることがで
きる。As is apparent from the above description, according to the battery of the present invention, it is possible to ensure that the electrode materials of the positive and negative electrodes face each other at the center of the power generating element.
The electrode material of any one of the electrodes does not wastefully occupy the space, and the battery capacity can be increased.
【００３１】また、最も外側の電極の外周面にも未塗工
部を設ければ、発電要素の外側でも電極の電極材料が無
駄にスペースを占有するようなことがなくなり、さらに
電池容量を増加に貢献することができる。If an uncoated portion is also provided on the outer peripheral surface of the outermost electrode, the electrode material of the electrode will not wastefully occupy the space outside the power generating element, further increasing the battery capacity. Can contribute to.
【００３２】さらに、負極電極の片側の面にのみ電極材
料の未塗工部を設けることにより、リチウムイオン電池
の電池容量を安全に増加させることができるようにな
る。Further, by providing an uncoated portion of the electrode material only on one surface of the negative electrode, the battery capacity of the lithium ion battery can be safely increased.
【図１】本発明の一実施形態を示すものであって、巻回
型の発電要素の構造を示す平面図である。FIG. 1, showing an embodiment of the present invention, is a plan view showing a structure of a wound power generating element.
【図２】本発明の一実施形態を示すものであって、巻回
する正極電極と負極電極とセパレータの構成を示す縦断
面図である。FIG. 2 illustrates one embodiment of the present invention, and is a longitudinal sectional view illustrating a configuration of a wound positive electrode, a negative electrode, and a separator.
【図３】従来例を示すものであって、巻回型の発電要素
の巻回工程を示す斜視図である。FIG. 3 is a perspective view showing a conventional example and showing a winding step of a winding type power generating element.
【図４】従来例を示すものであって、巻回する正極電極
と負極電極とセパレータの構成を示す縦断面図である。FIG. 4 shows a conventional example, and is a longitudinal sectional view showing a configuration of a wound positive electrode, a negative electrode, and a separator.
【図５】従来例を示すものであって、巻回型の発電要素
の構造を示す平面図である。FIG. 5 is a plan view showing a conventional example and showing a structure of a wound-type power generating element.
【符号の説明】 １ 発電要素 ２ 正極電極 ２ａ 正極集電体 ２ｂ 正極電極材料 ３ 負極電極 ３ａ 負極集電体 ３ｂ 負極電極材料 ３ｃ 未塗工部 ３ｄ 未塗工部 ４ セパレータ[Description of Signs] 1 Power generation element 2 Positive electrode 2a Positive current collector 2b Positive electrode material 3 Negative electrode 3a Negative current collector 3b Negative electrode material 3c Uncoated portion 3d Uncoated portion 4 Separator
Claims (3)
電極と負極電極をセパレータを介して巻回することによ
り巻回型の発電要素を形成した電池において、 正極電極又は負極電極のうち、電極材料の塗工部が発電
要素の最も内側に配置される電極に、集電体の外周面の
塗工開始部からほぼ１周分にわたって、その裏側の内周
面に電極材料を塗布しない未塗工部が設けられたことを
特徴とする電池。1. A battery in which a positive electrode and a negative electrode each having an electrode material coated on both surfaces of a current collector are wound through a separator to form a wound-type power generating element. The electrode material is not applied to the inner peripheral surface of the current collector on the electrode disposed on the innermost side of the power generation element for approximately one turn from the coating start portion on the outer peripheral surface of the current collector. A battery comprising an uncoated portion.
材料の塗工部が発電要素の最も外側に配置される電極
に、集電体の内周面の塗工終了部までのほぼ１周分にわ
たって、その裏側の外周面に電極材料を塗布しない未塗
工部が設けられたことを特徴とする請求項１に記載の電
池。2. A method according to claim 1, wherein the coated portion of the electrode material is applied to the electrode disposed on the outermost side of the power generating element, and the coated portion of the electrode material is applied to the inner peripheral surface of the current collector for approximately one round to the coated end portion. 2. The battery according to claim 1, wherein an uncoated portion on which no electrode material is applied is provided on the outer peripheral surface on the back side for a minute.
前記塗工部の裏側に未塗工部を設ける電極が負極電極で
あることを特徴とする請求項１又は請求項２に記載の電
池。3. The battery is a lithium ion battery,
The battery according to claim 1 or 2, wherein the electrode provided with the uncoated portion on the back side of the coated portion is a negative electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10087918A JPH11265706A (en) | 1998-03-16 | 1998-03-16 | Battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10087918A JPH11265706A (en) | 1998-03-16 | 1998-03-16 | Battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11265706A true JPH11265706A (en) | 1999-09-28 |
Family
ID=13928311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10087918A Pending JPH11265706A (en) | 1998-03-16 | 1998-03-16 | Battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11265706A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000077091A (en) * | 1998-08-27 | 2000-03-14 | Mitsubishi Electric Corp | Battery having spiral electrode body and its manufacture |
| JP2001015103A (en) * | 1999-06-29 | 2001-01-19 | Matsushita Electric Ind Co Ltd | Negative electrode plate and nonaqueous electrolyte secondary battery using negative electrode plate |
| JP2007512673A (en) * | 2003-11-24 | 2007-05-17 | ザ ジレット カンパニー | Batteries containing aluminum members |
| JP2010212086A (en) * | 2009-03-10 | 2010-09-24 | Sanyo Electric Co Ltd | Nonaqueous electrolyte secondary battery |
| JP2013251083A (en) * | 2012-05-31 | 2013-12-12 | Hitachi Vehicle Energy Ltd | Lithium ion secondary battery |
| US8734985B2 (en) | 2003-02-19 | 2014-05-27 | Samsung Sdi Co., Ltd. | Jelly-roll type battery unit and winding method thereof and lithium secondary battery comprising the same |
| EP3940854A4 (en) * | 2019-08-09 | 2022-06-08 | Contemporary Amperex Technology Co., Limited | Electrode assembly, secondary battery, and apparatus using battery |
-
1998
- 1998-03-16 JP JP10087918A patent/JPH11265706A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000077091A (en) * | 1998-08-27 | 2000-03-14 | Mitsubishi Electric Corp | Battery having spiral electrode body and its manufacture |
| JP2001015103A (en) * | 1999-06-29 | 2001-01-19 | Matsushita Electric Ind Co Ltd | Negative electrode plate and nonaqueous electrolyte secondary battery using negative electrode plate |
| US8734985B2 (en) | 2003-02-19 | 2014-05-27 | Samsung Sdi Co., Ltd. | Jelly-roll type battery unit and winding method thereof and lithium secondary battery comprising the same |
| US9299970B2 (en) | 2003-02-19 | 2016-03-29 | Samsung Sdi Co., Ltd. | Jelly-roll type battery unit and winding method thereof and lithium secondary battery comprising the same |
| JP2007512673A (en) * | 2003-11-24 | 2007-05-17 | ザ ジレット カンパニー | Batteries containing aluminum members |
| JP2010212086A (en) * | 2009-03-10 | 2010-09-24 | Sanyo Electric Co Ltd | Nonaqueous electrolyte secondary battery |
| JP2013251083A (en) * | 2012-05-31 | 2013-12-12 | Hitachi Vehicle Energy Ltd | Lithium ion secondary battery |
| EP3940854A4 (en) * | 2019-08-09 | 2022-06-08 | Contemporary Amperex Technology Co., Limited | Electrode assembly, secondary battery, and apparatus using battery |
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