JP4552237B2 - Single cell - Google Patents

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Publication number
JP4552237B2
JP4552237B2 JP02570599A JP2570599A JP4552237B2 JP 4552237 B2 JP4552237 B2 JP 4552237B2 JP 02570599 A JP02570599 A JP 02570599A JP 2570599 A JP2570599 A JP 2570599A JP 4552237 B2 JP4552237 B2 JP 4552237B2
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Japan
Prior art keywords
battery case
negative electrode
power generation
positive
long cylindrical
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JP2000223109A5 (en
JP2000223109A (en
Inventor
福永　　孝夫
隆弘 志築
秀幸 杉山
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GS Yuasa International Ltd
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GS Yuasa International Ltd
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    • 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

Description

【０００１】
【発明の属する技術分野】
本発明は、巻回型の発電要素を備えた単電池に関する。
【０００２】
【従来の技術】
電気自動車等に用いる大型大容量の非水電解質二次電池の従来の構成例を説明する。この非水電解質二次電池は、図５に示すように、方形箱型の電池ケース１内に巻回型の発電要素７を収納している。発電要素７は、帯状の正負の電極を帯状のセパレータを介して円筒形に巻回したものである。これらの正負の電極は、それぞれ巻回軸方向に少しずつずらして巻回することにより、一方の端面には正極の端部を突出させ、他方の端面には負極の端部を突出させている。そして、この発電要素７の一方の端面に正極端子３の集電体３ａを配置し、ここに突出する正極の端部を接続すると共に、他方の端面に負極端子４の集電体４ａを配置して、ここに突出する負極の端部を接続している。また、これらの正極端子３と負極端子４の先端部は、電池ケース１の端面から外部に突出させて、突出部を封止材等によって絶縁封止している。
【０００３】
【発明が解決しようとする課題】
ところが、上記非水電解質二次電池は、方形箱型の電池ケース１内に円筒形の発電要素７を収納するので、この電池ケース１の四隅の側面部に隙間（デッドスペース）が生じ、エネルギー密度が低下するという問題があった。しかも、このために電池ケース１を円筒形にしたとしても、電池を搭載する機器や装置側にスペースの無駄が生じ易く、特に電気自動車等の用途では多数の電池を並べて配置するために、このスペースの無駄をなくすことが困難になる。
【０００４】
また、上記円筒形の発電要素７を用いる場合に限らず、長円筒形の発電要素を１個だけ電池ケース１内に収納した場合にも、この長円筒形の湾曲した側面部に大きな隙間が生じるのを避けることはできない。しかも、この長円筒形の発電要素を用いて円筒形の発電要素７と同じ容量を得ようとすると、巻軸方向に直交する電池断面が細長い長方形になるため、特に大型大容量の用途では使い辛くなる。さらに、この問題は、非水電解質二次電池に限らず、巻回型の発電要素を用いる電池一般に共通する。
【０００５】
なお、図６に示すように、多数枚のシート状の正極８ａと負極８ｂを同じシート状のセパレータ８ｃを介して積層したスタック型の発電要素８を用いる場合には、この発電要素８を方形箱型の電池ケース１に隙間なく収納することができるので、エネルギー密度が低下するという問題は生じない。しかし、このスタック型の場合には、発電要素８の組み立てが巻回型に比べて面倒になるため、生産性が低下するという別の問題が生じる。
【０００６】
本発明は、かかる事情に対処するためになされたものであり、長円筒形の巻回型の発電要素を複数個並べて電池ケースに収納することにより、エネルギー密度を高めることができる電池を提供することを目的としている。
【０００７】
【課題を解決するための手段】
請求項１の発明は、帯状の正負の電極を帯状のセパレータを介して長円筒形にかつ長円筒形の一端側に正極端部が突出し他端側に負極端部が突出するよう巻回した巻回型の発電要素が、複数個、長円筒形の平坦な側面同士を合わせて配置され並列に接続されるとともに、方形箱型の電池ケースに、巻回軸線が電池ケース開口面に平行になるように収納され、かつ正極集電体を介して前記正極端部と接続される正極端子と、負極集電体を介して前記負極端部と接続される負極端子とが前記電池ケース開口面を塞ぐ蓋板に備えられたことを特徴とする。
【０００８】
請求項１の発明によれば、複数個の長円筒形の発電要素を並べて配置するので、この長円筒形の側面部の湾曲によるスペースの無駄を少なくして、エネルギー密度を高めることができる。
【０００９】
【００１０】
【００１１】
円筒形の発電要素が１個だけ配置される場合には、この発電要素をできるだけ隙間なく方形箱型の電池ケースに収納しても、約２２％のスペースの無駄が生じる。しかし、長円筒形の発電要素を２個収納すれば、同じ方形箱型の電池ケースにできるだけ隙間なく収納すれば、スペースの無駄を約１１％に減少させることができる。
【００１２】
【００１３】
また、長円筒形の発電要素を４個収納すれば、２個の場合と同じ方形箱型の電池ケースにできるだけ隙間なく収納することにより、スペースの無駄をさらに約５％まで減少させることができる。
【００１４】
【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。
【００１５】
図１〜図４は本発明の単電池の一実施形態を示すものであって、図１は非水電解質二次電池の電池ケース内に２個の発電要素を収納した場合の構造を示す斜視図、図２は非水電解質二次電池の外観を示す斜視図、図３は従来例と本実施形態での無駄なスペースの割合を比較した図、図４は非水電解質二次電池の電池ケース内に４個の発電要素を収納した場合の構造を示す斜視図である。なお、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。
【００１６】
本実施形態も、従来例と同様に、大型大容量の非水電解質二次電池について説明する。この非水電解質二次電池は、図２に示す方形箱型の電池ケース１内に、図１に示すように、長円筒形の巻回型の発電要素２を２個収納している。電池ケース１は、ステンレス鋼板の方形容器状の上端開口部に同じステンレス鋼板の方形の蓋板を溶接で接合したものである。そして、この電池ケース１の蓋板の両端部に正極端子３と負極端子４の上端部を突出させている。
【００１７】
発電要素２は、帯状の正負の電極を帯状のセパレータを介して長円筒形に巻回したものである。正極は、薄い帯状のアルミニウム箔の一方の端部を除く表面にリチウムコバルト複合酸化物等の正極活物質を塗布したものであり、負極は、薄い帯状の銅箔の他方の端部を除く表面にグラファイト等の負極活物質を塗布したものである。これらの正負の電極は、それぞれ巻回軸方向に少しずつずらして巻回することにより、一方の端面には正極のアルミニウム箔を露出させ、他方の端面には負極の銅箔を露出させている。このように構成された２個の発電要素２は、長円筒形の平坦な側面同士を合わせて、巻回軸線が電池ケース開口面に平行になるように電池ケース１内に収納される。
【００１８】
上記２個の発電要素２は、一方の端面側に共通の正極集電体５を配置して、ここに突出する正極端部のアルミニウム箔をそれぞれこの正極集電体５に接続すると共に、他方の端面側に共通の負極集電体６を配置して、ここに突出する負極端部の銅箔をそれぞれこの負極集電体６に接続する。従って、これら２個の発電要素２は、電池ケース１内で並列に接続されて１個の単電池を構成する。正極集電体５と負極集電体６は、それぞれアルミニウム板と銅板を波板状に繰り返し屈曲させたものであり、これらの波板状の各間隙に正極のアルミニウム箔や負極の銅箔を多数枚ずつ挟み込んで両側から押さえ付け超音波溶接やレーザー溶接等により溶着させることにより接続を行う。また、これらの正極集電体５と負極集電体６には、それぞれ波板状の部分から突出した接続部５ａ，６ａが形成され、２個の発電要素２の間に挿入される。そして、正極集電体５の接続部５ａの上方に突出する端部を正極端子３の下端部に接続固定すると共に、負極集電体６の接続部６ａの上方に突出する端部を負極端子４の下端部に接続固定する。
【００１９】
上記正極端子３と負極端子４は、それぞれ予め電池ケース１の蓋板の両端部の開口孔に上端部を挿入し、封止材を介してナットでネジ止めすることによって絶縁封止しておく。そして、この後に２個の発電要素２に接続された正極集電体５と負極集電体６の接続部５ａ，６ａの上端部をそれぞれ正極端子３と負極端子４の下端部に接続固定し、最後に電池ケース１の方形容器にこれら２個の発電要素２を収納して蓋板を接合する。
【００２０】
上記構成の非水電解質二次電池によれば、電池ケース１内に２個の発電要素２を並べて配置するので、この発電要素２の長円筒形の側面部の湾曲によるスペースの無駄を少なくすることができる。即ち、図３に示すように、円筒形の発電要素７を１個だけ用いる場合には、方形箱型の電池ケース１に収納しても、全体の約２２％の隙間Ｇ1 が生じるが、本実施形態では、長円筒形の発電要素２を２個用いるので、同じ方形箱型の電池ケース１に収納しても、隙間Ｇ2 は約１１％に減少する。従って、本実施形態の非水電解質二次電池によれば、電池ケース１内の無駄なスペースが少なくなるので、電池のエネルギー密度を高めることができる。
【００２１】
なお、上記実施形態では、電池ケース１内に２個の長円筒形の発電要素２を収納する場合について説明したが、３個以上の発電要素２を収納すれば、さらに無駄なスペースを省くことができるようになる。例えば図４に示すように、長円筒形の発電要素２を４個にした場合には、図３に示すように、方形箱型の電池ケース１に収納したときの隙間Ｇ3 が約５％にまで減少する。
【００２２】
また、上記実施形態では、複数個の発電要素２を正極集電体５と負極集電体６とを用いて並列に接続したが、この接続手段は任意であり、発電要素２の正負の電極と正極端子３や負極端子４との接続手段も任意である。
【００２３】
さらに、上記実施形態では、非水電解質二次電池について説明したが、本発明はこれに限らず、巻回型の発電要素を用いる任意の電池にも同様に実施可能である。
【００２４】
【発明の効果】
以上の説明から明らかなように、本発明の単電池によれば、複数個の長円筒形の発電要素を並べて、長円筒形の平坦な側面同士を合わせて巻回軸線が電池ケース開口面に平行になるように並列接続収納されるので、この長円筒形の側面部の湾曲によるスペースの無駄を少なくして、エネルギー密度を高めることができるようになる。
【図面の簡単な説明】
【図１】 本発明の一実施形態を示すものであって、非水電解質二次電池の電池ケース内に２個の発電要素を収納した場合の構造を示す斜視図である。
【図２】 本発明の一実施形態を示すものであって、非水電解質二次電池の外観を示す斜視図である。
【図３】 本発明の一実施形態を示すものであって、従来例と本実施形態での無駄なスペースの割合を比較した図である。
【図４】 本発明の一実施形態を示すものであって、非水電解質二次電池の電池ケース内に４個の発電要素を収納した場合の構造を示す斜視図である。
【図５】 従来例を示すものであって、非水電解質二次電池の電池ケース内に円筒形の巻回型の発電要素を収納した場合の構造を示す斜視図である。
【図６】 従来例を示すものであって、非水電解質二次電池の電池ケース内にスタック型の発電要素を収納した場合の構造を示す斜視図である。
【符号の説明】
１ 電池ケース
２ 発電要素
３ 正極端子
４ 負極端子
５ 正極集電体
６ 負極集電体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a unit cell including a wound type power generation element.
[0002]
[Prior art]
A conventional configuration example of a large-capacity non-aqueous electrolyte secondary battery used for an electric vehicle or the like will be described. As shown in FIG. 5, the nonaqueous electrolyte secondary battery includes a wound type power generation element 7 in a rectangular box type battery case 1. The power generation element 7 is obtained by winding a belt-like positive and negative electrode in a cylindrical shape through a belt-like separator. Each of these positive and negative electrodes is wound slightly shifted in the winding axis direction so that the end of the positive electrode protrudes from one end face and the end of the negative electrode protrudes from the other end face. . Then, the current collector 3a of the positive electrode terminal 3 is disposed on one end face of the power generation element 7, the end of the positive electrode protruding therefrom is connected, and the current collector 4a of the negative electrode terminal 4 is disposed on the other end face. And the edge part of the negative electrode which protrudes here is connected. Further, the tip portions of the positive electrode terminal 3 and the negative electrode terminal 4 are projected from the end surface of the battery case 1 to the outside, and the projecting portions are insulated and sealed with a sealing material or the like.
[0003]
[Problems to be solved by the invention]
However, since the non-aqueous electrolyte secondary battery houses the cylindrical power generation element 7 in the rectangular box-type battery case 1, gaps (dead spaces) are generated in the side surfaces of the four corners of the battery case 1, and energy is reduced. There was a problem that the density decreased. Moreover, even if the battery case 1 is made cylindrical for this purpose, it is easy to waste space on the equipment or device side on which the battery is mounted, and in order to arrange a large number of batteries side by side in applications such as electric vehicles, It becomes difficult to eliminate the waste of space.
[0004]
Further, not only when the cylindrical power generation element 7 is used, but also when only one long cylindrical power generation element is accommodated in the battery case 1, a large gap is formed in the curved side surface of the long cylindrical shape. It cannot be avoided. Moreover, if this long cylindrical power generation element is used to obtain the same capacity as that of the cylindrical power generation element 7, the battery cross section perpendicular to the winding axis direction becomes an elongated rectangular shape. It will be spicy. Furthermore, this problem is not limited to non-aqueous electrolyte secondary batteries, but is common to batteries that use a wound power generation element.
[0005]
As shown in FIG. 6, when a stack type power generation element 8 in which a large number of sheet-like positive electrodes 8a and negative electrodes 8b are stacked via the same sheet-like separator 8c is used, the power generation element 8 is rectangular. Since it can be stored in the box-shaped battery case 1 without a gap, there is no problem that the energy density is lowered. However, in the case of this stack type, the assembly of the power generation element 8 is more troublesome than the winding type, which causes another problem that productivity is lowered.
[0006]
The present invention has been made to cope with such a situation, and provides a battery capable of increasing energy density by arranging a plurality of long cylindrical wound power generation elements in a battery case. The purpose is that.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, a belt-like positive and negative electrode is wound in a long cylindrical shape through a belt-like separator so that the positive end protrudes from one end of the long cylindrical shape and the negative end protrudes from the other end. A plurality of winding-type power generation elements are arranged in parallel and connected in parallel with the long cylindrical flat side surfaces, and the winding axis is parallel to the battery case opening surface in the rectangular box-type battery case. It is made so retract and, and a positive terminal connected to said positive end via a positive current collector, the negative electrode terminal and said battery case opening which is connected to the negative end via a negative electrode current collector characterized in that was found with the lid plate for closing the surface.
[0008]
According to the first aspect of the present invention, since the plurality of long cylindrical power generation elements are arranged side by side, it is possible to reduce the waste of space due to the curvature of the side surface portion of the long cylindrical shape and to increase the energy density.
[0009]
[0010]
[0011]
When only one cylindrical power generation element is disposed, about 22% of the space is wasted even if this power generation element is housed in a rectangular box type battery case with as little gap as possible. However, if two long cylindrical power generation elements are housed, the waste of space can be reduced to about 11% if they are housed in the same rectangular box battery case with as little gap as possible.
[0012]
[0013]
Further, if four long cylindrical power generation elements are accommodated, the waste of space can be further reduced to about 5% by accommodating as much space as possible in the same rectangular box-type battery case as in the case of two. .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
1 to 4 show an embodiment of a unit cell of the present invention, and FIG. 1 is a perspective view showing a structure when two power generation elements are housed in a battery case of a nonaqueous electrolyte secondary battery. FIG. 2, FIG. 2 is a perspective view showing the appearance of a non-aqueous electrolyte secondary battery, FIG. 3 is a diagram comparing the proportion of wasted space in the conventional example and this embodiment, and FIG. 4 is a battery of the non-aqueous electrolyte secondary battery. It is a perspective view which shows the structure at the time of accommodating four electric power generation elements in a case. In addition, the same number is attached | subjected to the structural member which has the function similar to the prior art example shown in FIG.
[0016]
In the present embodiment, a large-capacity non-aqueous electrolyte secondary battery will be described as in the conventional example. As shown in FIG. 1, the nonaqueous electrolyte secondary battery houses two long cylindrical power generation elements 2 in a rectangular box battery case 1 shown in FIG. The battery case 1 is formed by welding a rectangular lid plate of the same stainless steel plate by welding to a rectangular container-like upper end opening of the stainless steel plate. And the upper end part of the positive electrode terminal 3 and the negative electrode terminal 4 is made to protrude in the both ends of the cover plate of this battery case 1. FIG.
[0017]
The power generation element 2 is obtained by winding a strip-like positive and negative electrode into a long cylindrical shape via a strip-like separator. The positive electrode is obtained by applying a positive electrode active material such as lithium cobalt composite oxide to the surface excluding one end of a thin strip-shaped aluminum foil, and the negative electrode is the surface excluding the other end of the thin strip-shaped copper foil. Is coated with a negative electrode active material such as graphite. These positive and negative electrodes are wound slightly shifted in the winding axis direction to expose the positive aluminum foil on one end face and the negative copper foil on the other end face. . The two power generating elements 2 configured in this manner are accommodated in the battery case 1 such that the flat cylindrical side surfaces are aligned with each other and the winding axis is parallel to the battery case opening surface.
[0018]
The two power generating elements 2 have a common positive electrode current collector 5 disposed on one end face side, and the positive electrode end aluminum foil protruding here is connected to the positive electrode current collector 5 respectively, and the other A common negative electrode current collector 6 is disposed on the end face side of the copper foil, and the copper foil at the negative electrode end projecting here is connected to the negative electrode current collector 6. Therefore, these two power generation elements 2 are connected in parallel in the battery case 1 to constitute one unit cell. The positive electrode current collector 5 and the negative electrode current collector 6 are obtained by repeatedly bending an aluminum plate and a copper plate in a corrugated shape, and an aluminum foil of a positive electrode or a copper foil of a negative electrode is placed in each of these corrugated gaps. The connection is made by inserting a large number of sheets, pressing them from both sides, and welding them by ultrasonic welding or laser welding. In addition, the positive electrode current collector 5 and the negative electrode current collector 6 are respectively provided with connection portions 5 a and 6 a protruding from corrugated portions, and are inserted between the two power generation elements 2. The end protruding above the connecting portion 5a of the positive electrode current collector 5 is connected and fixed to the lower end of the positive electrode terminal 3, and the end protruding above the connecting portion 6a of the negative electrode current collector 6 is connected to the negative electrode terminal. 4 is fixedly connected to the lower end portion.
[0019]
The positive electrode terminal 3 and the negative electrode terminal 4 are insulated and sealed by inserting upper ends into opening holes at both ends of the cover plate of the battery case 1 in advance and screwing with a nut through a sealing material. . Then, the upper ends of the connecting portions 5a and 6a of the positive electrode current collector 5 and the negative electrode current collector 6 connected to the two power generating elements 2 are connected and fixed to the lower end portions of the positive electrode terminal 3 and the negative electrode terminal 4, respectively. Finally, the two power generating elements 2 are accommodated in the rectangular container of the battery case 1 and the lid plate is joined.
[0020]
According to the non-aqueous electrolyte secondary battery having the above configuration, since the two power generation elements 2 are arranged side by side in the battery case 1, the waste of space due to the bending of the side surface of the long cylindrical shape of the power generation element 2 is reduced. be able to. That is, as shown in FIG. 3, when only one cylindrical power generation element 7 is used, a gap G 1 of about 22% of the whole is generated even when housed in a rectangular box-shaped battery case 1. In the present embodiment, since the two long cylindrical power generating elements 2 are used, the gap G 2 is reduced to about 11% even if they are housed in the same rectangular box type battery case 1. Therefore, according to the nonaqueous electrolyte secondary battery of the present embodiment, the useless space in the battery case 1 is reduced, so that the energy density of the battery can be increased.
[0021]
In the above embodiment, the case where two long cylindrical power generation elements 2 are accommodated in the battery case 1 has been described. However, if three or more power generation elements 2 are accommodated, further wasteful space can be saved. Will be able to. For example, as shown in FIG. 4, when the number of the long cylindrical power generating elements 2 is four, as shown in FIG. 3, the gap G 3 when housed in the rectangular box battery case 1 is about 5%. Decrease to
[0022]
Moreover, in the said embodiment, although the several electric power generation element 2 was connected in parallel using the positive electrode collector 5 and the negative electrode collector 6, this connection means is arbitrary and the positive / negative electrode of the electric power generation element 2 is used. The connecting means between the positive terminal 3 and the negative terminal 4 is also arbitrary.
[0023]
Furthermore, although the non-aqueous electrolyte secondary battery has been described in the above embodiment, the present invention is not limited to this, and can be similarly applied to any battery using a wound-type power generation element.
[0024]
【The invention's effect】
As is clear from the above description, according to the unit cell of the present invention, a plurality of long cylindrical power generation elements are arranged and the flat cylindrical side surfaces are aligned with each other so that the winding axis is at the battery case opening surface. Since they are stored in parallel so as to be parallel, it is possible to reduce the waste of space due to the curvature of the side surface of the long cylindrical shape and to increase the energy density.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a structure in a case where two power generating elements are housed in a battery case of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention.
FIG. 2, showing an embodiment of the present invention, is a perspective view showing an external appearance of a nonaqueous electrolyte secondary battery.
FIG. 3 shows an embodiment of the present invention, and is a diagram comparing the ratio of wasted space between a conventional example and this embodiment.
FIG. 4 shows an embodiment of the present invention, and is a perspective view showing a structure when four power generation elements are housed in a battery case of a nonaqueous electrolyte secondary battery.
FIG. 5 is a perspective view showing a conventional example and a structure when a cylindrical wound power generation element is housed in a battery case of a nonaqueous electrolyte secondary battery.
FIG. 6 is a perspective view showing a conventional example and showing a structure when a stack type power generation element is housed in a battery case of a nonaqueous electrolyte secondary battery.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Battery case 2 Power generating element 3 Positive electrode terminal 4 Negative electrode terminal 5 Positive electrode collector 6 Negative electrode collector

Claims (1)

帯状の正負の電極を帯状のセパレータを介して長円筒形にかつ長円筒形の一端側に正極端部が突出し他端側に負極端部が突出するよう巻回した巻回型の発電要素が、複数個、長円筒形の平坦な側面同士を合わせて配置され並列に接続されるとともに、方形箱型の電池ケースに、巻回軸線が電池ケース開口面に平行になるように収納され、かつ正極集電体を介して前記正極端部と接続される正極端子と、負極集電体を介して前記負極端部と接続される負極端子とが前記電池ケース開口面を塞ぐ蓋板に備えられたことを特徴とする単電池。A winding-type power generating element in which a strip-like positive and negative electrode is wound in a long cylindrical shape through a strip-like separator so that a positive end protrudes from one end of the long cylindrical shape and a negative end protrudes from the other end. a plurality, is connected in parallel are arranged together flat side surfaces of the long cylindrical battery case of a square box type, the winding axis is retract and to be parallel to the battery case opening surface, And a positive electrode terminal connected to the positive electrode end through a positive electrode current collector and a negative electrode terminal connected to the negative electrode end through a negative electrode current collector are provided in the lid plate that closes the battery case opening. single cell characterized by al the.
JP02570599A 1999-02-03 1999-02-03 Single cell Expired - Lifetime JP4552237B2 (en)

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