JP3986356B2 - Electric double layer capacitor - Google Patents

Electric double layer capacitor Download PDF

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Publication number
JP3986356B2
JP3986356B2 JP2002123654A JP2002123654A JP3986356B2 JP 3986356 B2 JP3986356 B2 JP 3986356B2 JP 2002123654 A JP2002123654 A JP 2002123654A JP 2002123654 A JP2002123654 A JP 2002123654A JP 3986356 B2 JP3986356 B2 JP 3986356B2
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Prior art keywords
electrode body
negative electrode
strip
shaped
positive electrode
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JP2003318070A (en
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修一 荒木
正和 佐々木
一雅 本多
雅己 竹田
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UD Trucks Corp
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UD Trucks Corp
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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
    • Y02E60/13—Energy storage using capacitors

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  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To realize a high-quality electric double-layer capacitor where a sub stance interposed between a container and a capacitor body is not carbonized in the electric double-layer capacitor provided with the capacitor body made by rolling a belt-shaped positive electrode and a belt-shaped negative electrode and a separator which separates the two electrodes and a container which seals the capacitor body together with the electrolytic solution. <P>SOLUTION: A winding of the belt-shaped negative electrode 11b is set to be longer by one final turn the that of the belt-shaped positive electrode 11a. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、電気二重層キャパシタに関する。
【０００２】
【従来の技術】
近年、各種の蓄電装置として、急速充電が可能で充放電サイクル寿命が長い、電気二重層キャパシタの適用技術が注目される。
【０００３】
図６は、電気二重層キャパシタの構成を例示する模式図であり、正極体１ａと負極体１ｂとセパレータ２は交互に積層して構成される。この積層体３（キャパシタ本体）は電解液に浸され、容器（図示せず）に収容して密封される。
【０００４】
正極体１ａおよび負極体１ｂは、活性炭電極４ａ，４ｂ（分極性電極）と集電極５ａ，５ｂ（アルミ電極）とからなり、電荷は活性炭電極４ａ，４ｂにたまり、電気の出し入れは集電極５ａ，５ｂを介して行われる。正極体１ａと負極体１ｂが同数のため、積層体３において、片端が正極体１ａの場合、反対側の片端は負極体１ｂとなるのである。
【０００５】
なお、特開2001-52974号においては、帯状の正極体と帯状の負極体とこれらの間を隔てるセパレータとからロール巻に構成されるキャパシタ本体と、キャパシタ本体を電解液と共に密封する容器と、を備えるものが開示される。
【０００６】
【発明が解決しようとする課題】
このような電気二重層キャパシタについて、諸種の研究開発を積み重ねる中から、積層体と容器との間において、正極の表面に接して炭素・水素・酸素などから構成される物質（たとえば、セルロースなど紙）があると、その物質に脱水が起こり炭化する、という知見が得られた。
【０００７】
図６の場合、右端の正極体１ａと容器との間に介在する紙製のセパレータ（積層体３の最外層）が炭化してしまうのである。炭化物は細かく崩れやすく、これが電解液を浮遊すると、リーク電流が発生しやすくなり、自己放電特性を悪化させる可能性も考えられる。
【０００８】
この発明は、このような知見に基づいてなされたものであり、容器とキャパシタ本体との間に物質の炭化を生じることのない、高品質の電気二重層キャパシタを実現しようとするものである。
【０００９】
【課題を解決するための手段】
第１の発明は、集電極と活性炭電極とからなる帯状の正極体と集電極と活性炭電極とからなる帯状の負極体とこれらの間を隔てる多孔質膜からなるセパレータとからロール巻に構成されるキャパシタ本体と、キャパシタ本体を電解液と共に密封する容器と、を備える電気二重層キャパシタにおいて、帯状の負極体を正極体より内側に配置してロール形状の巻回体を形成し、帯状の負極体は帯状の正極体よりもロール巻の終端側が１巻き分以上に長く設定したことを特徴とする。
【００１０】
第２の発明は、帯状の正極体と帯状の負極体との間を隔てるセパレータを帯状の負極体と一緒に１巻き分を長く設定したことを特徴とする。
【００１２】
【発明の効果】
第１の発明においては、帯状の正極体と帯状の負極体とこれらの間を隔てるセパレータとから、これらを重ね合わせる帯状体（キャパシタ本体の素材に相当する）が形成され、これを丸めることにより、キャパシタ本体はロール形状の巻回体に構成されるのである。
【００１３】
ロール巻の断面は、正極体と負極体がセパレータを挟みながら、径方向へ交互に重なる具合になり、ロール巻の終端側において、少なくとも１巻き分を長く設定の負極体は、それまでの最外層となるセパレータに巻き付けられ、キャパシタ本体の最外層を形成する。したがって、正極体がキャパシタ本体の最外層にならないので、最外層の表面に接して炭素・水素・酸素などから構成される物質（たとえば、セルロースなど紙）があっても、その物質に脱水が起こり炭化するようなことはない。
【００１４】
負極体と正極体との間を隔てるセパレータについては、負極体と一緒に長く設定することも考えられる。その場合においても、巻回体の最外層となるセパレータに接するのは、１巻き分以上を長く設定の負極体となり、正極体が最外層のセパレータに接しないので、セパレータが紙製であっても、これに脱水が起こり炭化するようなことはない。
【００１５】
この結果、容器とキャパシタ本体との間において、紙など物質の炭化現象が避けられ、自己放電特性も良好な高品質の電気二重層キャパシタを廉価に提供できる。
【００１８】
【発明の実施の形態】
図１〜図３に基づいて、第１の実施形態に係る電気二重層キャパシタの一例を説明すると、帯状の正極体１１ａと帯状の負極体１１ｂとこれらの間を隔てるセパレータ１２ａ，１２ｂとからロール巻に構成されるキャパシタ本体１３と、キャパシタ本体１３を電解液と共に密封する容器２０と、を備える。
【００１９】
容器２０は、軽量な金属（たとえば、アルミニウム）から底付き円筒形に成形される。２０ａは容器２０の開口部を密封する金属（たとえば、アルミニウム）の蓋であり、容器２０の内面および蓋２０ａの内面は絶縁層で被覆される。２１ａ，２１ｂは１対の端子であり、蓋２０ａを貫通する導電部２２と、蓋２０ａと導電部２２との間に介在する絶縁部２３と、から構成される。
【００２０】
図３において、正極体１１ａおよび負極体１１ｂは、集電極１５ａ，１５ｂと活性炭電極１６ａ，１６ｂ（分極性電極）とから組成される。これらの集電極１５ａ，１５ｂは、帯状の金属箔（たとえば、アルミニウム箔）からなり、その両面に活性炭電極１６ａ，１６ｂが形成される。負極体１１ｂの帯状平面にセパレータ１２ｂ（紙製などの多孔質膜）を介して帯状の正極体１１ａが重ねられ、正極体１１ａの帯状平面にセパレータ１２ａが重ねられ、４層に重なる帯状体１７（キャパシタ本体１３の素材）が形成される。
【００２１】
この帯状体１７は、図２のように負極体１１ｂを内側に丸められ、ロール形状の巻回体１３（キャパシタ本体）に形成される。巻回体１３の最外層を負極化すべく、帯状の負極体１１ｂは、帯状の正極体１１ａよりも、ロール巻の終端側が１巻き分を長く設定されるのである。
【００２２】
巻回体１７の断面は、正極体１１ａと負極体１１ｂがセパレータ１２ａ，１２ｂを挟みながら、径方向へ交互に重なる具合になり、ロール巻の終端側において、１巻き分を長く設定の負極体１１ｂは、それまでの最外層（セパレータ１２ａ）に巻き付けられ、巻回体１３の最外層を形成する。
【００２３】
キャパシタ本体１３は、電解液に浸され、容器２０に収容される。正極体１１ａおよび負極体１１ｂの集電極１６ａ，１６ｂにそれぞれ極性の対応する端子２１ａ，２１ｂが接続され、容器２０に蓋２０ａを付けて密封される。
【００２４】
このような構成により、巻回体１３の最外層が負極体１１ｂとなり、最外層の極性が正極とならないので、最外層の表面に接して炭素・水素・酸素などから構成される物質（紙など）があっても、その物質に脱水が起こり炭化するようなことはない。
【００２５】
負極体１１ｂの電極面を保護するため、正極体１１ａと負極体１１ｂとの間を隔てるセパレータ１２ｂについても、負極体１１ｂと一緒に１巻き分を長く設定することが考えられる。その場合、巻回体１３の最外層はセパレータ１２ｂになるが、このセパレータ１２ｂに接するのは、１巻き分を長く設定の負極体１１ｂとなり、正極体１１ａが最外層のセパレータ１２ｂに接しないので、セパレータ１２ｂが紙製であっても、これに脱水が起こり炭化するようなことはない。
【００２６】
この結果、容器２０とキャパシタ本体１３との間において、紙など物質の炭化現象が避けられ、自己放電特性も良好な高品質の電気二重層キャパシタを廉価に提供できる。
【００２７】
図１，図３，図４に基づいて、参考例に係る電気二重層キャパシタを説明すると、キャパシタ本体１３ａの外周をくるむ円筒形の負極体１８が備えられる。キャパシタ本体１３ａは、４層の帯状体１７Ａから、負極体１１ｂを内側に丸められ、ロール型の巻回体に形成される。４層の帯状体１７Ａにおいて、正極体１１ａと負極体１１ｂ（およびセパレータ１２ａ，１２ｂ）の長さは同一に設定される。
【００２８】
キャパシタ本体１３ａは、円筒形の負極体１８に納められ、全体が電解液に浸され、容器に収容される。円筒形の負極体１８は、単なる導電性物質の筒（たとえば、アルミニウム）でも良いし、集電極（たとえば、アルミニウム箔）の両面に活性炭電極を備えるものも良く、筒の任意箇所あるいは集電極が負極の端子２１ｂに接続される。キャパシタ本体１３ａは、正極体１１ａおよび負極体１１ｂの集電極１６ａ，１６ｂにそれぞれ極性の対応する端子２１ａ，２１ｂが接続され、容器２０に蓋２０ａを付けて密封される。
【００２９】
このような構成により、円筒形の負極体１８により、容器２０との間に炭素・水素・酸素などから構成される物質があっても、その物質は円筒形の負極体１８に接するのであり、正極の表面に接しないため、炭化現象の発生が避けられ、電気二重層キャパシタの自己放電特性を良好に維持できる。
【００３０】
円筒形の負極体１８に集電極を用いるものについては、材料費を節約するため、集電極の両面でなく、円筒の内面にのみ、活性炭電極を形成（円筒の外面は、活性炭電極を省略）してもよい。
【００３１】
図１，図５に基づいて、参考例を説明すると、キャパシタ本体１３ｂは、４層の帯状体１７Ｂから、正極体１１ａを内側に丸められ、ロール形状の巻回体に形成される。
【００３２】
４層の帯状体１７Ｂにおいては、正極体１１ａの帯状平面にセパレータ１２ａ（紙製などの多孔質膜）を介して帯状の負極体１１ｂが重ねられ、負極体１１ｂの帯状平面にセパレータ１２ｂが重ねられ、正極体１１ａと負極体１１ｂ（およびセパレータ１２ａ，１２ｂ）が同一の長さに設定されるのである。
【００３３】
キャパシタ本体１３は、電解液に浸され、容器２０に収容される。正極体１１ａおよび負極体１１ｂの集電極１６ａ，１６ｂにそれぞれ極性の対応する端子２１ａ，２１ｂが接続され、容器２０に蓋２０ａを付けて密封される。
【００３４】
このような構成により、巻回体１３ｂの最外層はセパレータ１２ｂとなり、このセパレータ１２ｂに接するのは負極体１１ｂであり、正極体１１ａが最外層のセパレータ１２ｂに接しないので、セパレータ１２ｂが紙製であっても、これに脱水が起こり炭化するようなことはない。
【００３５】
この結果、容器２０とキャパシタ本体１３ｂの間において、紙など物質の炭化現象が避けられ、自己放電特性も良好な高品質の電気二重層キャパシタを廉価に提供できる。
【図面の簡単な説明】
【図１】この発明に係る電気二重層キャパシタの外観図である。
【図２】同じくキャパシタ本体の構成を説明する斜視図である。
【図３】同じくキャパシタ本体の素材を説明する断面図である。
【図４】参考例を説明する斜視図である。
【図５】参考例を説明する斜視図である
【図６】従来の技術に係る電気二重層の構成を説明する模式図である。
【符号の説明】
１１ａ 正極体
１１ｂ 負極体
１２ａ，１２ｂ セパレータ
１３，１３ａ，１３ｂ キャパシタ本体
１５ａ，１５ｂ 活性炭電極（分極性電極）
１６ａ，１６ｂ 集電極
１７，１７Ａ，１７Ｂ 帯状体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric double layer capacitor.
[0002]
[Prior art]
2. Description of the Related Art In recent years, attention has been focused on electric double layer capacitor application technologies that can be rapidly charged and have a long charge / discharge cycle life as various power storage devices.
[0003]
FIG. 6 is a schematic view illustrating the configuration of the electric double layer capacitor, in which the positive electrode body 1a, the negative electrode body 1b, and the separator 2 are alternately stacked. The multilayer body 3 (capacitor body) is immersed in an electrolytic solution, accommodated in a container (not shown), and sealed.
[0004]
The positive electrode body 1a and the negative electrode body 1b are composed of activated carbon electrodes 4a and 4b (polarizable electrodes) and collector electrodes 5a and 5b (aluminum electrodes). Electric charges are accumulated in the activated carbon electrodes 4a and 4b, and electricity is taken in and out of the collector electrode 5a. , 5b. Since the number of the positive electrode bodies 1a and the number of the negative electrode bodies 1b is the same, in the laminated body 3, when one end is the positive electrode body 1a, the other end is the negative electrode body 1b.
[0005]
In JP-A-2001-52974, a capacitor body configured in a roll form from a strip-shaped positive electrode body and a strip-shaped negative electrode body and a separator separating them, a container for sealing the capacitor body together with an electrolyte, What comprises is disclosed.
[0006]
[Problems to be solved by the invention]
With regard to such an electric double layer capacitor, various kinds of research and development are accumulated, and a substance composed of carbon, hydrogen, oxygen, etc. in contact with the surface of the positive electrode between the laminate and the container (for example, paper such as cellulose) ), The substance was dehydrated and carbonized.
[0007]
In the case of FIG. 6, the paper separator (outermost layer of the laminate 3) interposed between the positive electrode body 1a at the right end and the container is carbonized. Carbide is easily broken finely, and if this floats the electrolyte, leakage current is likely to occur, and the self-discharge characteristics may be deteriorated.
[0008]
The present invention has been made based on such knowledge, and aims to realize a high-quality electric double layer capacitor that does not cause carbonization of a substance between the container and the capacitor body.
[0009]
[Means for Solving the Problems]
1st invention is comprised by the roll winding from the strip | belt-shaped positive electrode body which consists of a collector electrode and an activated carbon electrode, the strip | belt-shaped negative electrode body which consists of a collector electrode, and an activated carbon electrode, and the separator which consists of a porous membrane which separates these. And a container for sealing the capacitor body together with the electrolyte, in which the strip-shaped negative electrode body is disposed inside the positive electrode body to form a roll-shaped wound body, and the strip-shaped negative electrode The body is characterized in that the end side of the roll winding is set longer than one winding than the belt-like positive electrode body.
[0010]
The second invention is characterized in that a separator for separating the strip-shaped positive electrode body and the strip-shaped negative electrode body is set long for one turn together with the strip-shaped negative electrode body .
[0012]
【The invention's effect】
In the first invention, a strip-shaped body (corresponding to the material of the capacitor body) is formed by overlapping the strip-shaped positive electrode body, the strip-shaped negative electrode body, and the separator separating them. The capacitor body is configured as a roll-shaped wound body.
[0013]
The cross section of the roll winding becomes a positive electrode and a negative polar body separator degree overlapping alternately squeezing all husk, radially, at the end side of the roll winding, the negative electrode body of at least one turn of a long setting, until then It is wound around a separator that is the outermost layer to form the outermost layer of the capacitor body. Therefore, since the positive electrode body does not become the outermost layer of the capacitor body, even if there is a substance composed of carbon, hydrogen, oxygen, etc. (for example, paper such as cellulose) in contact with the surface of the outermost layer, the substance is dehydrated. There is no such thing as carbonization.
[0014]
About the separator which separates between a negative electrode body and a positive electrode body, setting with long with a negative electrode body is also considered. Even in that case, the separator that is the outermost layer of the wound body is a negative electrode body that is set longer than one turn, and the positive electrode body does not contact the separator of the outermost layer. However, this does not cause dehydration and carbonization.
[0015]
As a result, it is possible to inexpensively provide a high-quality electric double layer capacitor that avoids carbonization of a material such as paper and has good self-discharge characteristics between the container and the capacitor body.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An example of the electric double layer capacitor according to the first embodiment will be described with reference to FIGS. 1 to 3. A roll is formed from a strip-shaped positive electrode body 11 a, a strip-shaped negative electrode body 11 b, and separators 12 a and 12 b that separate them. The capacitor main body 13 comprised in a winding, and the container 20 which seals the capacitor main body 13 with electrolyte solution are provided.
[0019]
The container 20 is formed into a bottomed cylindrical shape from a lightweight metal (for example, aluminum). Reference numeral 20a denotes a metal (for example, aluminum) lid that seals the opening of the container 20, and the inner surface of the container 20 and the inner surface of the lid 20a are covered with an insulating layer. Reference numerals 21a and 21b denote a pair of terminals, each of which includes a conductive portion 22 that penetrates the lid 20a and an insulating portion 23 that is interposed between the lid 20a and the conductive portion 22.
[0020]
In FIG. 3, the positive electrode body 11a and the negative electrode body 11b are composed of collector electrodes 15a and 15b and activated carbon electrodes 16a and 16b (polarizable electrodes). These collector electrodes 15a and 15b are made of strip-shaped metal foil (for example, aluminum foil), and activated carbon electrodes 16a and 16b are formed on both surfaces thereof. A strip-shaped positive electrode body 11a is stacked on the strip-shaped plane of the negative electrode body 11b via a separator 12b (a porous film made of paper or the like), and the separator 12a is stacked on the strip-shaped plane of the positive electrode body 11a. (Material of the capacitor body 13) is formed.
[0021]
As shown in FIG. 2, the belt-like body 17 is formed on the roll-shaped wound body 13 (capacitor body) by rolling the negative electrode body 11b inward. In order to make the outermost layer of the wound body 13 into a negative electrode, the strip-shaped negative electrode body 11b is set longer by one turn on the end side of the roll winding than the strip-shaped positive electrode body 11a.
[0022]
The cross section of the wound body 17 is such that the positive electrode body 11a and the negative electrode body 11b are alternately overlapped in the radial direction while sandwiching the separators 12a and 12b, and the negative electrode body in which one winding is set longer at the end side of the roll winding 11b is wound around the outermost layer (separator 12a) so far, and forms the outermost layer of the wound body 13.
[0023]
The capacitor body 13 is immersed in the electrolytic solution and accommodated in the container 20. Polarity corresponding terminals 21a and 21b are connected to the collector electrodes 16a and 16b of the positive electrode body 11a and the negative electrode body 11b, respectively, and the container 20 is sealed with a lid 20a.
[0024]
With such a configuration, the outermost layer of the wound body 13 becomes the negative electrode body 11b, and the polarity of the outermost layer does not become the positive electrode. Therefore, a substance (paper or the like) composed of carbon, hydrogen, oxygen, etc. in contact with the surface of the outermost layer ) Does not cause dehydration and carbonization of the substance.
[0025]
In order to protect the electrode surface of the negative electrode body 11b, the separator 12b that separates the positive electrode body 11a and the negative electrode body 11b may be set longer by one turn together with the negative electrode body 11b. In that case, the outermost layer of the wound body 13 is the separator 12b, but the separator 12b is in contact with the negative electrode body 11b with one winding set longer, and the positive electrode body 11a is not in contact with the outermost layer separator 12b. Even if the separator 12b is made of paper, it does not dehydrate and carbonize.
[0026]
As a result, it is possible to inexpensively provide a high-quality electric double layer capacitor that can avoid carbonization of a substance such as paper and has good self-discharge characteristics between the container 20 and the capacitor body 13.
[0027]
The electric double layer capacitor according to the reference example will be described with reference to FIGS. 1, 3, and 4. A cylindrical negative electrode body 18 that surrounds the outer periphery of the capacitor body 13a is provided. The capacitor body 13a is formed into a roll-type wound body by rolling the negative electrode body 11b inward from the four-layer belt-like body 17A. In the four-layer strip 17A, the lengths of the positive electrode 11a and the negative electrode 11b (and the separators 12a and 12b) are set to be the same.
[0028]
The capacitor main body 13a is housed in a cylindrical negative electrode body 18, and the whole is immersed in an electrolytic solution and accommodated in a container. The cylindrical negative electrode body 18 may be a simple conductive material cylinder (for example, aluminum), or may have an activated carbon electrode on both sides of a collector electrode (for example, aluminum foil). It is connected to the negative terminal 21b. The capacitor body 13a is connected to the collector electrodes 16a and 16b of the positive electrode body 11a and the negative electrode body 11b with the corresponding terminals 21a and 21b, and the container 20 is sealed with a lid 20a.
[0029]
With such a configuration, even if there is a substance composed of carbon, hydrogen, oxygen, etc. between the cylindrical negative electrode body 18 and the container 20, the substance is in contact with the cylindrical negative electrode body 18, Since it does not contact the surface of the positive electrode, the occurrence of carbonization is avoided and the self-discharge characteristics of the electric double layer capacitor can be maintained well.
[0030]
In order to save material costs, the activated carbon electrode is formed not only on both sides of the collector electrode but on the inner surface of the cylinder for the cylindrical negative electrode body 18 (the activated carbon electrode is omitted on the outer surface of the cylinder). May be.
[0031]
A reference example will be described with reference to FIGS. 1 and 5. The capacitor body 13 b is formed into a roll-shaped wound body by rolling the positive electrode body 11 a inward from the four-layer belt-like body 17 B.
[0032]
In the four-layer belt-like body 17B, the belt-like negative electrode body 11b is overlaid on the belt-like plane of the positive electrode body 11a via a separator 12a (a porous film made of paper or the like), and the separator 12b is overlaid on the belt-like plane of the negative electrode body 11b. Thus, the positive electrode body 11a and the negative electrode body 11b (and the separators 12a and 12b) are set to the same length.
[0033]
The capacitor body 13 is immersed in the electrolytic solution and accommodated in the container 20. Polarity corresponding terminals 21a and 21b are connected to the collector electrodes 16a and 16b of the positive electrode body 11a and the negative electrode body 11b, respectively, and the container 20 is sealed with a lid 20a.
[0034]
With such a configuration, the outermost layer of the wound body 13b becomes the separator 12b, and the separator 12b is in contact with the negative electrode body 11b. Since the positive electrode body 11a does not contact the outermost layer separator 12b, the separator 12b is made of paper. Even so, dehydration does not occur and carbonization does not occur.
[0035]
As a result, it is possible to inexpensively provide a high-quality electric double layer capacitor that can avoid carbonization of a substance such as paper and has good self-discharge characteristics between the container 20 and the capacitor body 13b.
[Brief description of the drawings]
FIG. 1 is an external view of an electric double layer capacitor according to the present invention.
FIG. 2 is a perspective view illustrating the configuration of the capacitor body.
FIG. 3 is a cross-sectional view for explaining the material of the capacitor main body.
FIG. 4 is a perspective view illustrating a reference example .
FIG. 5 is a perspective view illustrating a reference example . FIG. 6 is a schematic diagram illustrating a configuration of an electric double layer according to a conventional technique.
[Explanation of symbols]
11a Positive electrode body 11b Negative electrode body 12a, 12b Separator 13, 13a, 13b Capacitor body 15a, 15b Activated carbon electrode (polarizable electrode)
16a, 16b collector electrodes 17, 17A, 17B strips

Claims (2)

集電極と活性炭電極とからなる帯状の正極体と集電極と活性炭電極とからなる帯状の負極体とこれらの間を隔てる多孔質膜からなるセパレータとからロール巻に構成されるキャパシタ本体と、キャパシタ本体を電解液と共に密封する容器と、を備える電気二重層キャパシタにおいて、帯状の負極体を正極体より内側に配置してロール形状の巻回体を形成し、帯状の負極体は帯状の正極体よりもロール巻の終端側が１巻き分以上に長く設定したことを特徴とする電気二重層キャパシタ。Capacitor body configured in roll form from a strip-shaped positive electrode body made of a collector electrode and an activated carbon electrode, a strip-shaped negative electrode body made of a collector electrode and an activated carbon electrode, and a separator made of a porous film separating them, and a capacitor And a container for sealing the main body together with an electrolyte solution. A strip-shaped negative electrode body is disposed inside the positive electrode body to form a roll-shaped wound body, and the strip-shaped negative electrode body is a strip-shaped positive electrode body. An electric double layer capacitor characterized in that the end side of the roll winding is set longer than one winding. 前記帯状の正極体と前記帯状の負極体との間を隔てる前記セパレータを前記帯状の負極体と一緒に１巻き分を長く設定したことを特徴とする請求項１記載の電気二重層キャパシタ。2. The electric double layer capacitor according to claim 1, wherein the separator separating the strip-shaped positive electrode body and the strip-shaped negative electrode body is set to be longer by one turn together with the strip-shaped negative electrode body.
JP2002123654A 2002-04-25 2002-04-25 Electric double layer capacitor Expired - Fee Related JP3986356B2 (en)

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JP2007201118A (en) * 2006-01-26 2007-08-09 Matsushita Electric Ind Co Ltd Wound electric double-layer capacitor
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