JP2006222256A - Electric-double-layer capacitor - Google Patents

Electric-double-layer capacitor Download PDF

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JP2006222256A
JP2006222256A JP2005034091A JP2005034091A JP2006222256A JP 2006222256 A JP2006222256 A JP 2006222256A JP 2005034091 A JP2005034091 A JP 2005034091A JP 2005034091 A JP2005034091 A JP 2005034091A JP 2006222256 A JP2006222256 A JP 2006222256A
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layer capacitor
electrode terminal
double layer
container
electric double
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Yasuhiko Koiso
保彦 小礒
Toshio Akiyama
敏雄 秋山
Koichi Yada
浩一 矢田
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Japan Pionics Ltd
Mitsubishi Gas Chemical Co Inc
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Mitsubishi Gas Chemical Co Inc
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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
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    • 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 provide an electric-double-layer capacitor wherein the air-tightness of the periphery of its each electrode terminal excels over a long term, in the electric-double-layer capacitor wherein a laminate comprising electrode sheets and separators impregnated with an electrolyte is sealed in a flat container, while the end of its each aluminum electrode terminal is exposed to the external. <P>SOLUTION: In the electric-double-layer capacitor excelling in a long-term reliability, the surface of its each aluminum electrode terminal which faces at least the stuck portion of its container to its electrode terminal is coated with an oxide film by an anodic oxidation processing (alumite processing), etc. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、活性炭等の分極性電極と電解液の界面である電気二重層に電気を蓄積する角型の電気二重層キャパシタであって、電極端子の周辺部の機密性が優れた電気二重層キャパシタに関する。   The present invention is a square electric double layer capacitor that accumulates electricity in an electric double layer that is an interface between a polarizable electrode such as activated carbon and an electrolytic solution, and has an excellent electric secrecy around the electrode terminal It relates to a capacitor.

近年、活性炭等の分極性電極と電解液の界面である電気二重層に電気を蓄積する電気二重層キャパシタが蓄電媒体として実用化され始めている。電気二重層キャパシタの一般的な構成としては、金属箔等の集電体及び活性炭等の分極性電極からなる電極シートと、セパレータが交互に積層され、電解液が含浸された構成を有する電気二重層キャパシタセルが形成され、さらに電気二重層キャパシタセルが容器に密封されて電気二重層キャパシタとされる。   In recent years, an electric double layer capacitor that accumulates electricity in an electric double layer that is an interface between a polarizable electrode such as activated carbon and an electrolytic solution has been put into practical use as a power storage medium. As a general configuration of an electric double layer capacitor, an electric sheet having a configuration in which a current collector such as a metal foil and a polarizable electrode such as activated carbon and separators are alternately laminated and impregnated with an electrolytic solution. A multilayer capacitor cell is formed, and the electric double layer capacitor cell is sealed in a container to form an electric double layer capacitor.

また、電気二重層キャパシタの製造は、電極シートとセパレータの積層体を、角型の電気二重層キャパシタにおいてはサンドウィッチ状に、円筒型の電気二重層キャパシタにおいてはロール状に形成し、集電体（正極体及び負極体）のリード部を各々の端子に接続し、積層体を容器に収納した後、容器の開口部から電解液を注入して積層体に電解液を含浸し、アルミニウム製の電極端子の先端を外部に露出した状態で容器を密封する方法が多く実施されている。   In addition, an electric double layer capacitor is manufactured by forming a laminated body of an electrode sheet and a separator in a sandwich shape in a square electric double layer capacitor and in a roll shape in a cylindrical electric double layer capacitor. (Positive electrode body and negative electrode body) Lead portions are connected to the respective terminals, and the laminated body is accommodated in a container. Then, an electrolytic solution is injected from the opening of the container to impregnate the laminated body with the electrolytic solution. Many methods of sealing the container with the tip of the electrode terminal exposed to the outside have been practiced.

このような電気二重層キャパシタにおいては、電解液として、高い耐電圧が得られる有機系電解液が一般的に用いられているが、微量の吸湿により耐電圧が低下し劣化しやすくなるという不都合が生じるので、電解液を注入する前に積層体を充分に乾燥させ、その後の操作は容器を密封するまで不活性ガス雰囲気下で行なわれている。また、容器の構成材料としては、通常は表面を接着性合成樹脂で被覆された金属箔が用いられ、容器の密封の際は、例えば加熱されたヒートシールバーを用いて、容器の開口部（貼り合わせ部）を、アルミニウム製の電極端子を挟んだ状態で押圧してヒートシールすることにより行なわれている。   In such an electric double layer capacitor, an organic electrolytic solution capable of obtaining a high withstand voltage is generally used as the electrolyte, but there is a disadvantage that the withstand voltage is lowered and deteriorated easily due to a small amount of moisture absorption. As a result, the laminate is sufficiently dried before injecting the electrolyte, and the subsequent operation is performed in an inert gas atmosphere until the container is sealed. In addition, as a constituent material of the container, a metal foil whose surface is coated with an adhesive synthetic resin is usually used. When the container is sealed, for example, a heated heat seal bar is used to open the container opening ( The bonding portion is pressed and heat-sealed with an aluminum electrode terminal sandwiched therebetween.

このように、電気二重層キャパシタは、その製造過程から使用期間が満了するまでの長期間にわたり容器内を気密に維持する必要があり、従来から容器の気密性を向上させるための手段が開発されてきた。電極端子周辺部の気密性を向上させるための技術としては、例えば次のような特許文献に記載されたものが開発されている。
特開平１１−１９５５６１号公報 特開２０００−７７２７０号公報 特開２００１−１０２０３７号公報 特開２００２−２３７４３６号公報 As described above, the electric double layer capacitor needs to keep the inside of the container airtight for a long period from the manufacturing process to the expiration of the use period, and conventionally, means for improving the airtightness of the container has been developed. I came. As a technique for improving the airtightness of the periphery of the electrode terminal, for example, a technique described in the following patent document has been developed.
JP-A-11-195561 JP 2000-77270 A JP 2001-102037 A JP 2002-237436 A

しかしながら、電解液の種類によっては、アルミニウム製の電極端子と接触すると、除々にこのアルミニウム製の電極端子を腐蝕させ、腐蝕した電極端子部材と容器の間隙を通過して、容器の外部に染み出し、電極端子周辺部の美観を損ねるだけでなく、電極端子周辺部の気密性を低下させる虞があった。
従って、本発明が解決しようとする課題は、電解液に対する耐腐食性が優れた電極端子を備え、長期にわたり電極端子周辺部の気密性が優れた電気二重層キャパシタを提供することである。 However, depending on the type of electrolyte, when it comes into contact with an aluminum electrode terminal, it gradually corrodes the aluminum electrode terminal, and passes through the gap between the corroded electrode terminal member and the container and oozes out of the container. In addition to impairing the aesthetics of the electrode terminal periphery, there is a risk of reducing the airtightness of the electrode terminal periphery.
Therefore, the problem to be solved by the present invention is to provide an electric double layer capacitor having an electrode terminal excellent in corrosion resistance against an electrolytic solution and excellent in airtightness in the periphery of the electrode terminal for a long period of time.

本発明者らは、前記の課題を解決すべく鋭意検討した結果、アルミニウム電極端子の少なくとも容器の貼り合わせ部と対面する表面を、陽極酸化処理（アルマイト処理）等で酸化皮膜被覆することにより、電極端子の電解液に対する耐腐食性が向上し、長期にわたり電極端子周辺部の気密性を高度に維持できること等を見出し本発明に到達した。
すなわち本発明は、電解液が含浸された電極シートとセパレータの積層体が、偏平状の容器に、アルミニウム電極端子の先端が外部に露出された状態で密封された電気二重層キャパシタであって、アルミニウム電極端子の少なくとも容器の貼り合わせ部と対面する表面が、酸化皮膜により被覆されてなることを特徴とする電気二重層キャパシタである。 As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention applied an oxide film coating on the surface of the aluminum electrode terminal facing at least the bonded portion of the container by anodizing (alumite treatment) or the like, The inventors have found that the corrosion resistance of the electrode terminal to the electrolyte is improved, and that the airtightness around the electrode terminal can be maintained at a high level for a long time.
That is, the present invention is an electric double layer capacitor in which a laminate of an electrode sheet and a separator impregnated with an electrolyte is sealed in a flat container with the tip of an aluminum electrode terminal exposed to the outside, The electric double layer capacitor is characterized in that at least the surface of the aluminum electrode terminal facing the bonded portion of the container is covered with an oxide film.

本発明の電気二重層キャパシタは、少なくともアルミニウム電極端子の容器の貼り合わせ部と対面する表面を、陽極酸化処理等で酸化皮膜被覆する構成なので、この部分の電極端子表面が電解液により腐蝕されることがなく、長期にわたり電極端子周辺部の気密性を維持できる。その結果、長期にわたり電気二重層キャパシタの性能を高度に維持することが可能である。   Since the electric double layer capacitor of the present invention has a structure in which at least the surface of the aluminum electrode terminal facing the bonded portion of the container is covered with an oxide film by anodizing or the like, the electrode terminal surface of this part is corroded by the electrolytic solution. The airtightness around the electrode terminal can be maintained over a long period of time. As a result, it is possible to maintain the performance of the electric double layer capacitor at a high level over a long period of time.

本発明は、純アルミニウム、アルミニウム合金、またはアルミニウムを主成分とする材料からなる電極端子（以下、アルミニウム電極端子と称する）を備えた角型の電気二重層キャパシタに適用される。
以下、本発明の電気二重層キャパシタを、図１〜図４に基づいて詳細に説明するが、本発明がこれらにより限定されるものではない。
図１及び図２は、本発明の電気二重層キャパシタの一例を示す構成図である。図３は、図１及び図２におけるａ−ａ’断面の例を示す断面図である。図４は、本発明の電気二重層キャパシタのアルミニウム電極端子の断面の例を示す断面図である。 The present invention is applied to a rectangular electric double layer capacitor provided with an electrode terminal (hereinafter referred to as an aluminum electrode terminal) made of pure aluminum, an aluminum alloy, or a material mainly composed of aluminum.
Hereinafter, although the electric double layer capacitor of this invention is demonstrated in detail based on FIGS. 1-4, this invention is not limited by these.
1 and 2 are configuration diagrams showing an example of the electric double layer capacitor of the present invention. FIG. 3 is a cross-sectional view illustrating an example of a cross section along line aa ′ in FIGS. 1 and 2. FIG. 4 is a cross-sectional view showing an example of a cross section of an aluminum electrode terminal of the electric double layer capacitor of the present invention.

本発明の電気二重層キャパシタは、図１及び図２に示すように、電解液が含浸された電極シートとセパレータの積層体１が、偏平状の容器２に、アルミニウム電極端子３の先端が外部に露出された状態で密封された電気二重層キャパシタであって、アルミニウム電極端子３の少なくとも容器の貼り合わせ部４と対面する表面５が、酸化皮膜６（斜線部）により被覆されてなる電気二重層キャパシタである。すなわち、図３に示すように、偏平状の容器２の貼り合わせ部４における水平断面において、アルミニウム電極端子３の側面が酸化皮膜６により被覆された電気二重層キャパシタである。   As shown in FIGS. 1 and 2, the electric double layer capacitor of the present invention includes an electrode sheet impregnated with an electrolytic solution and a separator laminate 1 in a flat container 2 and a tip of an aluminum electrode terminal 3 externally. An electric double layer capacitor that is sealed in an exposed state, and at least a surface 5 of the aluminum electrode terminal 3 facing the bonding portion 4 of the container is covered with an oxide film 6 (shaded portion). It is a multilayer capacitor. That is, as shown in FIG. 3, the electric double layer capacitor in which the side surface of the aluminum electrode terminal 3 is covered with the oxide film 6 in the horizontal cross section in the bonding portion 4 of the flat container 2.

本発明において、アルミニウムの酸化皮膜は、図１に示すように、容器の貼り合わせ部４と対面する表面５のみに設けてもよいが、図２に示すように、容器の貼り合わせ部４と対面する表面５とともに、その周辺部に設けてもよい。酸化皮膜を周辺部に設ける場合は、通常は１ｃｍ以下の幅で設けられるが、アルミニウム電極端子の表面のうち、容器に収納される側は、後工程で積層体のリード部と溶接する表面を除いて全て酸化皮膜により被覆させることもできる。また、容器の外部に露出される側の先端部の表面は、通常は酸化皮膜被覆しない。   In the present invention, the aluminum oxide film may be provided only on the surface 5 facing the bonding portion 4 of the container as shown in FIG. 1, but as shown in FIG. You may provide in the peripheral part with the surface 5 which faces. When the oxide film is provided on the peripheral portion, it is usually provided with a width of 1 cm or less. Of the surfaces of the aluminum electrode terminals, the side to be accommodated in the container has a surface to be welded with the lead portion of the laminate in a later step. Except for this, it is also possible to cover all with an oxide film. Further, the surface of the tip portion on the side exposed to the outside of the container is usually not covered with an oxide film.

本発明において、アルミニウム電極端子表面の酸化皮膜の形成は、通常は酸化皮膜を形成しない部分をマスクで被覆した後、陽極酸化処理（アルマイト処理）することにより行なわれる。陽極酸化処理の方法については特に限定されることはないが、例えば処理液（電解液）としては、硫酸、シュウ酸、クロム酸等が使用され、通常は印加電圧１〜１００Ｖ、印加電流０．１〜２０Ａ／ｄｍ２程度の条件でアルミニウムの酸化が行なわれる。陽極酸化処理の際は、必要に応じて、アルミニウム電極端子表面のアルカリ処理等の前処理、あるいは水蒸気処理等の後処理が施される。このようにして電極端子の表面に形成される酸化皮膜の厚みは、通常は１〜１００μｍ程度である In the present invention, the formation of the oxide film on the surface of the aluminum electrode terminal is usually carried out by covering the portion where the oxide film is not formed with a mask and then anodizing (alumite treatment). The method of anodizing treatment is not particularly limited. For example, sulfuric acid, oxalic acid, chromic acid or the like is used as a treating solution (electrolytic solution). oxidation of the aluminum is performed in 1 to 20A / dm 2 about conditions. At the time of anodizing, pretreatment such as alkali treatment on the surface of the aluminum electrode terminal or post-treatment such as steam treatment is performed as necessary. Thus, the thickness of the oxide film formed on the surface of the electrode terminal is usually about 1 to 100 μm.

本発明の電気二重層キャパシタにおいては、アルミニウム電極端子の断面形状は偏平な長方形であってもよいが、少なくとも容器の貼り合わせ部４と対面する部分の断面形状は、図４に示すように、側面端部に向かって薄く形成されてなる形状、例えば偏平な六角形、八角形、平行四辺形、台形、楕円形、またはこれらに類似する形状とすることが好ましい。電極端子の断面をこのような形状とすることにより、電極端子３と容器の貼り合わせ部４の接着の際に、段差がなくなり間隙が生じにくくなる。その結果、さらに電極端子周辺部の気密性を向上させることができる。容器の貼り合わせ部４と対面しない部分の断面形状は、容器の貼り合わせ部と対面する部分と同じであるか、あるいは偏平な長方形とされる。   In the electric double layer capacitor of the present invention, the cross-sectional shape of the aluminum electrode terminal may be a flat rectangle, but at least the cross-sectional shape of the portion facing the bonding portion 4 of the container is as shown in FIG. It is preferable that the shape is formed thinly toward the side end, for example, a flat hexagon, octagon, parallelogram, trapezoid, ellipse, or a similar shape. By making the cross section of the electrode terminal into such a shape, there is no step when the electrode terminal 3 and the bonding portion 4 of the container are bonded, and a gap is hardly generated. As a result, the airtightness around the electrode terminal can be further improved. The cross-sectional shape of the portion that does not face the bonding portion 4 of the container is the same as the portion that faces the bonding portion of the container, or is a flat rectangle.

本発明の電気二重層キャパシタは、主に電極シートとセパレータを積層する工程、開口部（貼り合わせ部）を有する偏平状の容器に積層体を収納する工程、容器に電解液を注入する工程、積層体を減圧処理する工程、及び容器を密封する工程を経て製造される。
電極シート（正極体及び負極体）とセパレータを積層する際は、正極体及び負極体、あるいは正極体のリード部及び負極体のリード部が、各々前述のアルミニウム電極端子（正極端子及び負極端子）に接続できるように積層される。積層体は水分等を極低濃度まで除去するために、乾燥または減圧乾燥される。また、積層体を収納するための少なくとも一辺に開口部を有する偏平状の容器も乾燥または減圧乾燥される。 The electric double layer capacitor of the present invention is mainly composed of a step of laminating an electrode sheet and a separator, a step of storing the laminate in a flat container having an opening (bonding portion), a step of injecting an electrolyte into the container, The laminated body is manufactured through a process of reducing the pressure and a process of sealing the container.
When laminating an electrode sheet (a positive electrode body and a negative electrode body) and a separator, the positive electrode body and the negative electrode body, or the lead portion of the positive electrode body and the lead portion of the negative electrode body are respectively the above-described aluminum electrode terminals (positive electrode terminal and negative electrode terminal). It is laminated so that it can be connected to. The laminate is dried or dried under reduced pressure in order to remove moisture and the like to a very low concentration. Further, a flat container having an opening on at least one side for housing the laminate is also dried or dried under reduced pressure.

次に、積層体の正極体及び負極体、あるいはこれらのリード部が、アルミニウム電極端子に溶接またはカシメ等により接着されるとともに、アルミニウム電極端子が容器の開口部（貼り合わせ部）側になるように偏平状の容器に収納される。
その後、開口部から容器へ電解液が注入される。続いて、容器が減圧装置に接続され、積層体の減圧処理が行なわれる。この減圧処理により、活性炭等の分極性電極に吸着されているガスが除去されるとともに、積層体に電解液を効率よく含浸することができる。 Next, the positive electrode body and the negative electrode body of the laminate or the lead portions thereof are bonded to the aluminum electrode terminals by welding or caulking, and the aluminum electrode terminals are on the opening (bonding portion) side of the container. In a flat container.
Thereafter, an electrolytic solution is injected into the container from the opening. Subsequently, the container is connected to the decompression device, and the laminate is decompressed. By this decompression treatment, the gas adsorbed on the polarizable electrode such as activated carbon is removed, and the laminate can be efficiently impregnated with the electrolytic solution.

また、必要に応じて、電解液の注入から容器の密封までの間に、分極性電極に含まれる水分や官能基を電気分解し除去するために、電極端子に通電して電解精製を行なうこともできる。
積層体の減圧処理後、容器の密封が行なわれる。容器の密封は、例えば加熱された２本のヒートシールバーを、容器を挟んだ状態で押圧することにより容器の密封を行なうことができる。尚、本発明においては、電解液の注入から容器の密封まで、乾燥された不活性ガス雰囲気下で行なわれる。 In addition, if necessary, between the injection of the electrolyte and the sealing of the container, the electrode terminal is energized and subjected to electrolytic purification in order to electrolyze and remove moisture and functional groups contained in the polarizable electrode. You can also.
After the depressurization treatment of the laminate, the container is sealed. The container can be sealed by, for example, pressing two heated heat seal bars while sandwiching the container. In the present invention, the process from injection of the electrolytic solution to sealing of the container is performed in a dry inert gas atmosphere.

次に、本発明を実施例により具体的に説明するが、本発明がこれらにより限定されるものではない。   EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited by these.

（電気二重層キャパシタの製作）
長さ６０ｍｍ、幅３０ｍｍ、厚さ１．０ｍｍのアルミニウム電極端子（正極端子及び負極端子）の表面のうち、容器の貼り合わせ部と対面する表面（厚み面を含む）と、その周辺部に２ｍｍの幅で酸化皮膜を形成させた。酸化皮膜の形成は、酸化皮膜を形成しない部分をマスクで被覆した後、処理液として硫酸を用い、印加電圧２０Ｖ、印加電流２Ａ／ｄｍ２の条件で陽極酸化処理することにより行なった。また、後処理として、加熱加圧された水蒸気を接触させた。酸化皮膜の厚みは約４０μｍであった。 (Production of electric double layer capacitor)
Of the surfaces of aluminum electrode terminals (positive terminal and negative terminal) having a length of 60 mm, a width of 30 mm, and a thickness of 1.0 mm, the surface (including the thickness surface) facing the bonded portion of the container and the periphery thereof are 2 mm. An oxide film was formed with a width of. The oxide film was formed by covering the portion where the oxide film was not formed with a mask, and then anodizing using sulfuric acid as the treatment liquid under the conditions of an applied voltage of 20 V and an applied current of 2 A / dm 2 . Moreover, the heat-pressed water vapor was made to contact as post-processing. The thickness of the oxide film was about 40 μm.

次に、活性炭、カーボンブラック、ＰＴＦＥ等の混合物からなる分極性電極にアルミ箔を貼り合わせた正極体、負極体と、紙製のセパレータを、正極体のリード部及び負極体のリード部が、各々電極端子に接続できるように、合計３０枚積層させて、一辺が１００ｍｍの正方形の積層体（厚さ１５ｍｍ）を製作した。積層体の正極体のリード部及び負極体のリード部を、各々前記のアルミニウム電極端子（正極端子及び負極端子）に溶接により接着した後、真空乾燥機を用いてこれらを１６０℃で１２時間減圧乾燥した。   Next, a positive electrode body, a negative electrode body, and a paper separator obtained by bonding an aluminum foil to a polarizable electrode made of a mixture of activated carbon, carbon black, PTFE, and the like. A total of 30 sheets were laminated so that each could be connected to an electrode terminal, and a square laminate (thickness 15 mm) having a side of 100 mm was produced. After the lead part of the positive electrode body and the lead part of the negative electrode body of the laminated body are bonded to the aluminum electrode terminals (positive electrode terminal and negative electrode terminal) by welding, they are depressurized at 160 ° C. for 12 hours using a vacuum dryer. Dried.

また、表面をポリエチレンフィルム（厚さ０．０３ｍｍ）で被覆したアルミ箔（厚さ０．０７ｍｍ）を基材とする一辺が１５０ｍｍの正方形の偏平状の容器を、真空乾燥機を用いて８０℃で１５時間減圧乾燥した。偏平状の容器は、一辺に開口部を有するものであった。アルミニウム電極端子が溶接により接着した積層体と偏平状の容器を、窒素雰囲気下で室温まで冷却した後、アルミニウム電極端子が容器の開口部（貼り合わせ部）側になるように偏平状の容器に挿入した。   Also, a square flat container with a side of 150 mm, which is made of aluminum foil (thickness 0.07 mm) whose surface is coated with a polyethylene film (thickness 0.03 mm), is heated at 80 ° C. using a vacuum dryer. And dried under reduced pressure for 15 hours. The flat container has an opening on one side. After the laminate and the flat container to which the aluminum electrode terminals are bonded by welding are cooled to room temperature in a nitrogen atmosphere, the flat electrode is placed on the flat container so that the aluminum electrode terminals are on the opening (bonding part) side of the container. Inserted.

続いて、プロピレンカーボネート溶媒にアンモニウム塩等を溶解させた電解液９０ｍｌを、容器の開口部から注入した。電解液の注入を終了した後、容器を真空ポンプに接続し、３０分間真空ポンプにより減圧にして、積層体の減圧処理を行なった。また、この間、電極端子に通電して電解精製を行なった。
その後、容器の開口部（容器の貼り合わせ部）を１５０℃でヒートシールし、偏平状の容器を密封して、図２に示すような構成の電気二重層キャパシタを得た。 Subsequently, 90 ml of an electrolytic solution in which an ammonium salt or the like was dissolved in a propylene carbonate solvent was injected from the opening of the container. After the injection of the electrolytic solution was completed, the container was connected to a vacuum pump, and the pressure was reduced by the vacuum pump for 30 minutes, and the laminate was subjected to a pressure reduction treatment. During this period, the electrode terminal was energized to perform electrolytic purification.
Thereafter, the opening of the container (the bonded part of the container) was heat-sealed at 150 ° C., and the flat container was sealed to obtain an electric double layer capacitor configured as shown in FIG.

（電極端子の周辺部の調査）
このような電気二重層キャパシタを１０個製作し、温度７０℃、湿度６０％の環境下で２ヶ月間充放電を繰返した。各々の電気二重層キャパシタについて、容器の開口部（容器の貼り合わせ部）を切断し、電子顕微鏡を用いて断面を観察した。その結果、いずれの電気二重層キャパシタも腐食は見られなかった。 (Investigation around the electrode terminals)
Ten such electric double layer capacitors were manufactured, and charging and discharging were repeated for two months in an environment of a temperature of 70 ° C. and a humidity of 60%. About each electric double layer capacitor, the opening part (bonding part of a container) of the container was cut | disconnected and the cross section was observed using the electron microscope. As a result, no corrosion was observed in any of the electric double layer capacitors.

実施例１の電気二重層キャパシタの製作において、アルミニウム電極端子として、図４（１）に示すように、断面形状が偏平な六角形のものを用いた以外は、実施例１と同様にして電気二重層キャパシタを製作した。尚、電極端子は、いずれも長さ６０ｍｍ、幅３０ｍｍ、厚さ１．０ｍｍ（中央部）、端部の角度は４５度であった。
このような電気二重層キャパシタを１０個製作し、実施例１と同様に電極端子の周辺部の調査を行なった。その結果、いずれの電気二重層キャパシタも腐食は見られなかった。 In manufacturing the electric double layer capacitor of Example 1, the aluminum electrode terminal was electrically operated in the same manner as in Example 1 except that a hexagonal cross-sectional shape was used as shown in FIG. A double layer capacitor was fabricated. Each electrode terminal had a length of 60 mm, a width of 30 mm, a thickness of 1.0 mm (center portion), and an end portion angle of 45 degrees.
Ten such electric double layer capacitors were manufactured, and the periphery of the electrode terminal was examined in the same manner as in Example 1. As a result, no corrosion was observed in any of the electric double layer capacitors.

（比較例１）
実施例１の電気二重層キャパシタの製作において、アルミニウム電極端子として、酸化皮膜を形成していないものを用いた以外は、実施例１と同様にして電気二重層キャパシタを製作した。
このような電気二重層キャパシタを１０個製作し、実施例１と同様に電極端子の周辺部の調査を行なった。その結果、４個の電気二重層キャパシタについて、微小な腐食部が見られた。 (Comparative Example 1)
In the production of the electric double layer capacitor of Example 1, an electric double layer capacitor was produced in the same manner as in Example 1 except that an aluminum electrode terminal without an oxide film was used.
Ten such electric double layer capacitors were manufactured, and the periphery of the electrode terminal was examined in the same manner as in Example 1. As a result, minute corroded portions were observed for the four electric double layer capacitors.

以上のように、本発明の電気二重層キャパシタは、アルミニウム電極端子の周辺部が腐蝕され難く、長期にわたり電極端子周辺部の気密性を維持できることがわかった。   As described above, it was found that the electric double layer capacitor of the present invention hardly corrodes the peripheral portion of the aluminum electrode terminal and can maintain the airtightness of the peripheral portion of the electrode terminal for a long time.

本発明の電気二重層キャパシタの一例を示す構成図Configuration diagram showing an example of an electric double layer capacitor of the present invention 本発明の図１以外の電気二重層キャパシタの一例を示す構成図The block diagram which shows an example of the electric double layer capacitor other than FIG. 1 of this invention 図１及び図２におけるａ−ａ’断面の例を示す断面図Sectional drawing which shows the example of the a-a 'cross section in FIG.1 and FIG.2. 本発明の電気二重層キャパシタのアルミニウム電極端子の断面の例を示す断面図Sectional drawing which shows the example of the cross section of the aluminum electrode terminal of the electric double layer capacitor of this invention

符号の説明Explanation of symbols

１ 積層体
２ 偏平状の容器
３ アルミニウム電極端子
４ 貼り合わせ部
５ アルミニウム電極端子の貼り合わせ部と対面する表面
６ 酸化皮膜
DESCRIPTION OF SYMBOLS 1 Laminated body 2 Flat container 3 Aluminum electrode terminal 4 Bonding part 5 Surface which faces the bonding part of aluminum electrode terminal 6 Oxide film

Claims (7)

電解液が含浸された電極シートとセパレータの積層体が、偏平状の容器に、アルミニウム電極端子の先端が外部に露出された状態で密封された電気二重層キャパシタであって、アルミニウム電極端子の少なくとも容器の貼り合わせ部と対面する表面が、酸化皮膜により被覆されてなることを特徴とする電気二重層キャパシタ。   An electrode sheet impregnated with an electrolyte solution and a laminate of separators is an electric double layer capacitor sealed in a flat container with the tip of an aluminum electrode terminal exposed to the outside, and at least the aluminum electrode terminal An electric double layer capacitor characterized in that the surface of the container facing the bonded portion is covered with an oxide film. 酸化皮膜が、容器の貼り合わせ部と対面する電極端子の表面とともに、その周辺部に１ｃｍ以下の幅で形成された請求項１に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 oxide film is formed with a width of 1 cm or less around the surface of the electrode terminal facing the bonded portion of the container, in the periphery thereof. 酸化皮膜が、容器に収納される側の電極端子において、実質的に積層体のリード部と溶接する表面を除いた全ての表面に形成された請求項１に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 oxide film is formed on all surfaces of the electrode terminal on the side accommodated in the container except for a surface to be welded to the lead portion of the laminate. 酸化皮膜が陽極酸化処理により形成された請求項１に記載の電気二重層キャパシタ。   The electric double layer capacitor according to claim 1, wherein the oxide film is formed by anodization. 酸化皮膜の厚みが１〜１００μｍである請求項１に記載の電気二重層キャパシタ。   The electric double layer capacitor according to claim 1, wherein the oxide film has a thickness of 1 to 100 μm. アルミニウム電極端子の容器の貼り合わせ部と対面する部分の断面形状が、偏平な六角形、八角形、平行四辺形、台形、楕円形、またはこれらに類似する形状である請求項１に記載の電気二重層キャパシタ。   The electrical cross section according to claim 1, wherein the cross-sectional shape of the portion of the aluminum electrode terminal facing the bonded portion of the container is a flat hexagon, octagon, parallelogram, trapezoid, ellipse, or a similar shape. Double layer capacitor. アルミニウム電極端子の断面形状が、全体にわたって、偏平な六角形、八角形、平行四辺形、台形、楕円形、またはこれらに類似する形状である請求項１に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 cross-sectional shape of the aluminum electrode terminal is a flat hexagon, octagon, parallelogram, trapezoid, ellipse, or a similar shape throughout.
JP2005034091A 2005-02-10 2005-02-10 Electric-double-layer capacitor Pending JP2006222256A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018518042A (en) * 2015-04-09 2018-07-05 ネスキャップ カンパニー, リミテッドNesscap Co., Ltd. Electric double layer element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018518042A (en) * 2015-04-09 2018-07-05 ネスキャップ カンパニー, リミテッドNesscap Co., Ltd. Electric double layer element
US10658128B2 (en) 2015-04-09 2020-05-19 Nesscap Co., Ltd. Electric double-layer device

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