JP2005327760A - Electric double-layer capacitor and its manufacturing method - Google Patents

Electric double-layer capacitor and its manufacturing method Download PDF

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JP2005327760A
JP2005327760A JP2004141788A JP2004141788A JP2005327760A JP 2005327760 A JP2005327760 A JP 2005327760A JP 2004141788 A JP2004141788 A JP 2004141788A JP 2004141788 A JP2004141788 A JP 2004141788A JP 2005327760 A JP2005327760 A JP 2005327760A
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capacitor
capacitor element
electric double
fixing member
metal case
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Kunitsugu Miyata
晋嗣 宮田
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Tokin Corp
NEC Tokin Hyogo Ltd
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NEC Tokin Corp
NEC Tokin Ceramics 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric double-layer capacitor that uses a simplified fixation method for a winding type capacitor not to greatly increase the number of parts and has an improved reliability to an external force as a result, and to provide its manufacturing method. <P>SOLUTION: The winding type capacitor 11 is inserted into a fixing member 16 that is made of shape memory alloy and is deformed like a ring, and it is punt into a metallic case 15. Then, the fixing member 16 is restored to the original shape, thereby bringing the fixing member 16 into contact with the outer circumference of the capacitor 11 and the inner circumference of the metallic case 15. Due to such a structure, the capacitor 11 can be fixed in the same effective manner as in a case where it is fixed by the metallic case 15, resulting in the improved reliability of the electric double-layer capacitor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、金属ケースに巻回型のキャパシタ素子を封入した構造の電気二重層キャパシタに関し、特に耐震性の向上を図った電気二重層キャパシタ及びその製造方法に関するものである。   The present invention relates to an electric double layer capacitor having a structure in which a winding type capacitor element is enclosed in a metal case, and more particularly to an electric double layer capacitor with improved seismic resistance and a method for manufacturing the same.

電気二重層キャパシタは、電荷を有する固体と、それに接触する電解液の界面に形成される、厚さ数ｎｍ程度の電気二重層を、誘電体として利用したものである。電気二重層の容量は、１ｃｍ2あたり数十μＦであるが、表面積が数千ｍ2にも及ぶ活性炭を電極として用いることにより、数百〜数千Ｆの極めて大きな容量を得ることが可能である。 The electric double layer capacitor uses an electric double layer having a thickness of about several nanometers, which is formed at the interface between a charged solid and an electrolyte solution in contact therewith, as a dielectric. The capacity of the electric double layer is several tens of μF per 1 cm 2 , but it is possible to obtain an extremely large capacity of several hundred to several thousand F by using activated carbon having a surface area of several thousand m 2 as an electrode. is there.

そして、電気二重層キャパシタは、下記のような特徴を有し、実用に供されるとともに、さらなる性能向上のための検討がなされている。
（１）充放電サイクルに伴う容量の劣化が少ない。
（２）一般的な電池に比較して、起動後に瞬時に大きな出力を取り出せる。 The electric double layer capacitor has the following characteristics and is put into practical use, and studies for further performance improvement have been made.
(1) There is little deterioration of the capacity accompanying a charge / discharge cycle.
(2) Compared with a general battery, a large output can be taken out instantly after startup.

現用の電気二重層キャパシタで、小型のものは、表面に活性炭を主とする分極性電極層を形成した一対の集電体の間に、ポリプロピレン不織布などからなるセパレータを挟んで素子とし、この素子に電解液を含浸させ、金属容器に収容し、キャップとガスケットにより金属容器に密封したコイン型の構造をとっている。   A small-sized electric double layer capacitor in use is an element in which a separator made of polypropylene nonwoven fabric is sandwiched between a pair of current collectors having a polarizable electrode layer mainly composed of activated carbon on the surface. It is impregnated with an electrolytic solution, accommodated in a metal container, and has a coin-type structure sealed in a metal container with a cap and a gasket.

また、比較的大容量のものとして、帯状の導電体からなる集電体の表面に分極性電極層を形成した正負一対の電極体と、電極体の間に介在するセパレータを渦巻状に巻き回してキャパシタ素子とし、この素子に電解液を含浸させ、金属容器に収容し、容器の開口部をキャップで密閉して構成した、巻回型の電気二重層キャパシタが製造されている。   In addition, as a relatively large capacity, a pair of positive and negative electrode bodies in which a polarizable electrode layer is formed on the surface of a current collector made of a strip-shaped conductor and a separator interposed between the electrode bodies are wound in a spiral shape. As a capacitor element, a wound type electric double layer capacitor is manufactured in which the element is impregnated with an electrolytic solution, accommodated in a metal container, and the opening of the container is sealed with a cap.

この他に、小型化、薄型化を目的に、シート状の分極性電極、集電体、セパレータを複数枚積層して、扁平な直方体のケースに封入した、角型の電気二重層キャパシタも製造されている。そして、これらの電気二重層キャパシタは主にＩＣメモリのバックアップやアクチュエータのバックアップに使用されている。   In addition, for the purpose of miniaturization and thinning, a rectangular electric double layer capacitor is also manufactured, in which a plurality of sheet-shaped polarizable electrodes, current collectors, and separators are stacked and enclosed in a flat rectangular parallelepiped case. Has been. These electric double layer capacitors are mainly used for IC memory backup and actuator backup.

図３は、従来の巻回型キャパシタ素子の構成を模式的に示す斜視図である。図３において、３１は正極側集電体、３２は正極側分極性電極層、３３は負極側集電体、３４は負極側分極性電極層、３５はセパレータ、３６は正極側タブ端子、３７は負極側タブ端子である。   FIG. 3 is a perspective view schematically showing a configuration of a conventional wound capacitor element. In FIG. 3, 31 is a positive electrode side current collector, 32 is a positive electrode side polarizable electrode layer, 33 is a negative electrode side current collector, 34 is a negative electrode side polarizable electrode layer, 35 is a separator, 36 is a positive electrode side tab terminal, 37 Is a negative-side tab terminal.

図３における正極側集電体３１、負極側集電体３３は、アルミニウム箔からなり、表面にエッチングを施して用いる。また、正極側分極性電極層３２と負極側分極性電極層３４は、活性炭粉末と導電性補助剤及びバインダを混練した混和物を塗布して形成される。   The positive electrode side current collector 31 and the negative electrode side current collector 33 in FIG. 3 are made of aluminum foil, and are used by etching the surface. Moreover, the positive electrode side polarizable electrode layer 32 and the negative electrode side polarizable electrode layer 34 are formed by applying a mixture obtained by kneading activated carbon powder, a conductive auxiliary agent and a binder.

そして、分極性電極層を形成していない面に、正極側タブ端子３６と負極側タブ端子３７をかしめにより接続し、正極側分極性電極層３２と負極側分極性電極層３４を、セパレータ３５を介して対向配置し、さらに負極側集電体３３の露出面にセパレータ３５を配置して巻き回し、巻回型キャパシタ素子とする。   Then, the positive electrode side tab terminal 36 and the negative electrode side tab terminal 37 are connected by caulking to the surface where the polarizable electrode layer is not formed, and the positive electrode side polarizable electrode layer 32 and the negative electrode side polarizable electrode layer 34 are connected to the separator 35. The separator 35 is disposed on the exposed surface of the negative electrode side current collector 33 and wound to form a wound capacitor element.

このようにして得られた巻回型キャパシタ素子は、そのまま放置すると、巻き回した状態が緩んでしまうので、何らかの拘束手段を講じる必要がある。例えば特許文献１には、巻回型キャパシタ素子の外周に粘着テープを貼り付けて、緩みを抑制する技術が開示されている。   If the wound capacitor element obtained in this way is left as it is, the wound state is loosened, and it is necessary to take some restraining means. For example, Patent Document 1 discloses a technique for suppressing loosening by attaching an adhesive tape to the outer periphery of a wound capacitor element.

図４は、巻回型キャパシタ素子の外周に粘着テープを巻き回した後、金属ケースに封入し、封口などの後処理を施した、従来の電気二重層キャパシタの断面図である。図４において、４１は巻回型キャパシタ素子、４２は粘着テープ、４３は正極側タブ端子、４４は負極側タブ端子、４５は金属ケース、４６はゴムキャップである。   FIG. 4 is a cross-sectional view of a conventional electric double layer capacitor in which an adhesive tape is wound around the outer periphery of a wound capacitor element, then sealed in a metal case, and subjected to post-processing such as sealing. In FIG. 4, 41 is a wound capacitor element, 42 is an adhesive tape, 43 is a positive side tab terminal, 44 is a negative side tab terminal, 45 is a metal case, and 46 is a rubber cap.

図４に示したように、巻回型キャパシタ素子４１を金属ケース４５に装入した後、電解液を注入し、正極側タブ端子４３と負極側タブ端子４４を貫通させて、ゴムキャップ４６を取り付け、金属ケース４５の開口部にカーリング加工を施して封止するというのが、巻回型キャパシタ素子を有する電気二重層キャパシタの、一般的な製造方法である。   As shown in FIG. 4, after the winding type capacitor element 41 is inserted into the metal case 45, the electrolytic solution is injected, and the rubber tab 46 is inserted through the positive side tab terminal 43 and the negative side tab terminal 44. Attachment and sealing of the opening of the metal case 45 by curling is a general manufacturing method of an electric double layer capacitor having a wound capacitor element.

また、この場合は、巻回型キャパシタ素子４１に接続されたタブ端子が、ゴムキャップによって固定されるので、巻回型キャパシタ素子４１も間接的にではあるが、金属ケース４５の中で位置が固定されることになり、これによって、振動など外部から加わる力で、巻回型キャパシタ素子４１が損傷を受けるのを防止している。   In this case, since the tab terminal connected to the wound capacitor element 41 is fixed by the rubber cap, the position of the wound capacitor element 41 in the metal case 45 is also indirectly. Thus, the wound capacitor element 41 is prevented from being damaged by an external force such as vibration.

また、特許文献２には、金属ケース内における、巻回型キャパシタ素子の位置の固定を確実に行うために、金属ケース側と巻回型キャパシタ素子側のいずれにも、固定用の部材を設ける技術が開示されている。   Further, in Patent Document 2, a fixing member is provided on both the metal case side and the wound capacitor element side in order to securely fix the position of the wound capacitor element in the metal case. Technology is disclosed.

特開２００１−１１０６７９号公報JP 2001-110679 A 特開２０００−２６０６６４号公報JP 2000-260664 A

しかしながら、特許文献１に開示されているように、タブ端子の固定によって巻回型キャパシタ素子を間接的に固定する方法では、巻回型キャパシタ素子の金属ケースにおける底部側の端部には、何ら拘束手段が施されていないので、振動や衝撃を繰り返し受けているうちに、巻回型キャパシタ素子自体の損傷や、タブ端子の変形や亀裂が発生し、キャパシタ特性の劣化が起こる可能性がある。   However, as disclosed in Patent Document 1, in the method of indirectly fixing the wound capacitor element by fixing the tab terminal, there is no effect on the bottom end of the metal case of the wound capacitor element. Since there is no restraining means, damage to the wound capacitor element itself, deformation or cracking of the tab terminal may occur during repeated vibration and impact, and capacitor characteristics may deteriorate. .

また、特許文献２に開示されている技術では、巻回型キャパシタ素子の固定は確実に行われるものの、部品数が増加し、それに伴って組立の工数も増加することになり、結果的に製造コストを押し上げることになる。   In addition, in the technique disclosed in Patent Document 2, although the winding capacitor element is securely fixed, the number of parts increases, and as a result, the number of man-hours for assembly increases, resulting in manufacturing. This will increase costs.

従って、本発明の課題は、巻回型キャパシタ素子を金属ケースに封入する構造の電気二重層キャパシタにおいて、部品数の大幅な増加に繋がらない、簡略な巻回型キャパシタ素子の固定方法と、それを用いることによって、外力に対する信頼性を向上した電気二重層キャパシタ及びその製造方法を提供することにある。   Accordingly, an object of the present invention is to provide a simple method for fixing a wound capacitor element that does not lead to a significant increase in the number of components in an electric double layer capacitor having a structure in which the wound capacitor element is enclosed in a metal case. It is an object of the present invention to provide an electric double layer capacitor with improved reliability against external force and a method for manufacturing the same.

本発明は、前記課題の解決のため、巻回型キャパシタ素子の巻きの緩み防止と、金属ケース内における位置固定を同時に行える構造を検討した結果なされたものである。   In order to solve the above-described problems, the present invention has been made as a result of studying a structure capable of simultaneously preventing the loosening of the winding capacitor element and fixing the position in the metal case.

即ち、本発明は、帯状の導電体からなる集電体の表面に分極性電極層が形成された正負一対の電極体と、前記正負一対の電極体の間に介在するセパレータとを渦巻状に巻き回したキャパシタ素子を、電解液とともに金属ケースに封入した構造を有する電気二重層キャパシタにおいて、前記キャパシタ素子と前記金属ケースとの間に、少なくとも一部が前記キャパシタ素子の外周と前記金属ケースの内周に接した状態の、形状記憶合金からなる固定部材が配置されていることを特徴とする電気二重層キャパシタである。   That is, the present invention spirally forms a pair of positive and negative electrode bodies in which a polarizable electrode layer is formed on the surface of a current collector made of a strip-shaped conductor, and a separator interposed between the pair of positive and negative electrode bodies. In an electric double layer capacitor having a structure in which a wound capacitor element is enclosed in a metal case together with an electrolytic solution, at least a part of the outer circumference of the capacitor element and the metal case are between the capacitor element and the metal case. An electric double layer capacitor characterized in that a fixing member made of a shape memory alloy in contact with the inner periphery is disposed.

また、本発明は、帯状の導電体からなる集電体の表面に分極性電極層を形成して正負一対の電極体を得る工程と、間にセパレータを介在させた状態で、前記正負一対の電極体を渦巻状に巻き回してキャパシタ素子を得る工程と、前記キャパシタ素子の外周に、形状記憶処理を施した形状記憶合金からなるリング状の固定部材を配置した状態で、金属ケースに挿入する工程と、前記固定部材の形状回復により、前記固定部材の少なくとも一部が前記キャパシタ素子の外周を押圧するとともに、前記固定部材の少なくとも一部が前記金属ケースの内周に接することで、前記キャパシタ素子を前記金属ケース内に固定する工程を有することを特徴とする電気二重層キャパシタの製造方法である。   The present invention also includes a step of forming a polarizable electrode layer on the surface of a current collector made of a strip-shaped conductor to obtain a pair of positive and negative electrodes, and a pair of positive and negative with the separator interposed therebetween. A process of obtaining a capacitor element by winding the electrode body in a spiral shape, and a ring-shaped fixing member made of a shape memory alloy subjected to a shape memory process being arranged on the outer periphery of the capacitor element, and inserted into a metal case And at least part of the fixing member presses the outer periphery of the capacitor element and at least part of the fixing member contacts the inner periphery of the metal case by the process and the shape recovery of the fixing member. It is a manufacturing method of the electric double layer capacitor characterized by having the process of fixing an element in the said metal case.

本発明に用いる固定部材は、形状記憶合金で構成されるので、巻き回した直後の巻回型キャパシタ素子を装入し、形状回復処理を行うことで、巻回型キャパシタ素子の外周を拘束し、しかも固定部材の少なくとも一部が、金属ケースの内周に接触した状態となる。このために巻回型キャパシタ素子を金属ケースで固定したのと同等の効果が得られ、電気二重層キャパシタの信頼性を向上することができる。   Since the fixing member used in the present invention is made of a shape memory alloy, the outer periphery of the wound capacitor element is restrained by inserting the wound capacitor element immediately after winding and performing a shape recovery process. And at least one part of a fixing member will be in the state which contacted the inner periphery of the metal case. For this reason, the same effect as that obtained by fixing the wound capacitor element with the metal case can be obtained, and the reliability of the electric double layer capacitor can be improved.

また、基本的に必要な部品は固定部材のみであり、固定に要する操作も固定部材の形状回復のみなので、製造コストを押し上げることが極めて少ない。   In addition, basically, only the fixing member is necessary, and the operation required for fixing is only recovery of the shape of the fixing member, so that the manufacturing cost is hardly increased.

本発明に用いられる固定部材は、基本的に形状記憶合金で構成された環状であれば良く、線材で構成されるリング状であっても、円筒状であっても使用できる。また、形状記憶合金として多数の材質が実用化されているが、形状回復が起こる温度が過度に高いものでは、巻回型キャパシタ素子を熱によって損なう可能性があるので、この点を考慮して選択する必要がある。   The fixing member used in the present invention may be basically an annular shape made of a shape memory alloy, and can be used in a ring shape made of a wire or a cylindrical shape. In addition, many materials have been put into practical use as shape memory alloys. However, if the temperature at which shape recovery occurs is excessively high, the wound capacitor element may be damaged by heat. Must be selected.

具体的には、変態温度が室温近傍から１００℃前後まで調整可能な、チタン−ニッケル系の合金などが好適に使用できる。なお、巻回型キャパシタ素子には従来の材料や製法によるものがそのまま使用できる。   Specifically, a titanium-nickel alloy whose transformation temperature can be adjusted from around room temperature to around 100 ° C. can be suitably used. Note that conventional materials and manufacturing methods can be used as they are for the wound capacitor element.

このような固定構造のため、振動によるリード端子の曲がりや折れを防止することができ、電気二重層キャパシタの耐震性を向上させることができる。   Such a fixing structure can prevent the lead terminal from being bent or bent due to vibration, and can improve the earthquake resistance of the electric double layer capacitor.

次に具体的な例を挙げ、本発明の実施の形態について説明する。図１は本発明の実施の形態に係る電気二重層キャパシタの一部破砕斜視図である。図１において、１１は巻回型キャパシタ素子、１２は正極側タブ端子、１３は負極側タブ端子、１４はゴムキャップ、１５は金属ケース、１６は固定部材である。   Next, specific examples will be given to describe embodiments of the present invention. FIG. 1 is a partially broken perspective view of an electric double layer capacitor according to an embodiment of the present invention. In FIG. 1, 11 is a wound capacitor element, 12 is a positive side tab terminal, 13 is a negative side tab terminal, 14 is a rubber cap, 15 is a metal case, and 16 is a fixing member.

前記のように、巻回型キャパシタ素子１１には従来の構成のものが使用可能である。ここでは集電体として厚さが５０μｍのアルミニウム箔を用い、分極性電極層には活性炭粉末に、導電性補助剤としてケッチェンブラックと、バインダとしてポリテトラフルオロエチレンを加えて混練した混和物を用いた。また、セパレータにはポリプロピレンの不織布を用いた。   As described above, the wound capacitor element 11 can be of a conventional configuration. Here, an aluminum foil having a thickness of 50 μm is used as a current collector, and an admixture obtained by kneading with Ketjen black as a conductive auxiliary agent and polytetrafluoroethylene as a binder is added to activated carbon powder as a polarizable electrode layer. Using. Moreover, the nonwoven fabric of polypropylene was used for the separator.

このような構成の正負の電極体に、正負のタブ端子を取り付けた後、セパレータを介在させて巻き回し、巻回型キャパシタ素子１１を得た。そして、固定部材１６にはチタン−ニッケル系の合金を用い、巻回型キャパシタ素子１１を内部に挿通し、金属ケース１５に装入した後、形状回復処理を行った。   Positive and negative tab terminals were attached to the positive and negative electrode bodies having such a configuration, and then wound with a separator interposed therebetween to obtain a wound capacitor element 11. Then, a titanium-nickel alloy was used for the fixing member 16, and the wound capacitor element 11 was inserted inside and inserted into the metal case 15, and then a shape recovery process was performed.

図２は、巻回型キャパシタ素子を固定部材に挿通した状態を示す図で、図２（ａ）は挿通直後の状態、図２（ｂ）は固定部材の形状回復処理を行った後の状態である。図２において、２１は正極側電極体、２２は負極側電極体、２３は正極側タブ端子、２４は負極側タブ端子、２５は金属ケース、２６ａは巻回型キャパシタ素子を挿通した直後の固定部材、２６ｂは形状回復処理を行った後の固定部材である。   2A and 2B are views showing a state in which the wound capacitor element is inserted through the fixing member. FIG. 2A is a state immediately after insertion, and FIG. 2B is a state after the shape recovery process of the fixing member is performed. It is. In FIG. 2, 21 is a positive electrode body, 22 is a negative electrode body, 23 is a positive side tab terminal, 24 is a negative side tab terminal, 25 is a metal case, and 26a is fixed immediately after the winding capacitor element is inserted. The member 26b is a fixing member after the shape recovery process is performed.

この後、電解液を注入し、ゴムキャップを取り付けて封口加工を行い、電気二重層キャパシタを得た。なお、電解液としては、プロピレンカーボネートにテトラエチルアンモニウムテトラフルオロボレートを、１モル／リットルの濃度で溶解した溶液を用いた。   Then, electrolyte solution was inject | poured, the rubber cap was attached, the sealing process was performed, and the electric double layer capacitor was obtained. As the electrolytic solution, a solution in which tetraethylammonium tetrafluoroborate was dissolved in propylene carbonate at a concentration of 1 mol / liter was used.

図２（ｂ）に示したように、固定部材２６ｂは、形状回復処理により、金属ケース２５の内周と巻回型キャパシタ素子の外周の、いずれにも接する状態で配置されていることから、外力による巻回型キャパシタ素子の移動が極めて起こり難いので、振動などによる損傷が極めて少なくなる。このため、本発明の電気二重層キャパシタの信頼性は、従来よりも向上したものとなる。   As shown in FIG. 2 (b), the fixing member 26b is arranged in a state in contact with both the inner periphery of the metal case 25 and the outer periphery of the wound capacitor element by the shape recovery process. Since the winding capacitor element is hardly moved by an external force, damage due to vibration or the like is extremely reduced. For this reason, the reliability of the electric double layer capacitor of the present invention is improved as compared with the prior art.

本発明の実施の形態に係る電気二重層キャパシタの一部破砕斜視図。1 is a partially broken perspective view of an electric double layer capacitor according to an embodiment of the present invention. 巻回型キャパシタ素子を固定部材に挿通した状態を示す図。図２（ａ）は挿通直後の状態。図２（ｂ）は固定部材の形状回復処理を行った後の状態。The figure which shows the state which penetrated the winding type capacitor element in the fixing member. FIG. 2A shows a state immediately after insertion. FIG. 2B shows a state after the shape recovery process of the fixing member. 従来の巻回型キャパシタ素子の構成を模式的に示す斜視図。The perspective view which shows typically the structure of the conventional winding type capacitor element. 従来の電気二重層キャパシタの断面図。Sectional drawing of the conventional electric double layer capacitor.

符号の説明Explanation of symbols

１１，４１ 巻回型キャパシタ素子
１２，２３，３６，４３ 正極側タブ端子
１３，２４，３７，４４ 負極側タブ端子
１４，４６ ゴムキャップ
１５，２５，４５ 金属ケース
１６，２６ａ，２６ｂ 固定部材
２１ 正極側電極体
２２ 負極側電極体
３１ 正極側集電体
３２ 正極側分極性電極層
３３ 負極側集電体
３４ 負極側分極性電極層
３５ セパレータ
４２ 粘着テープ 11, 41 Winding type capacitor elements 12, 23, 36, 43 Positive side tab terminals 13, 24, 37, 44 Negative side tab terminals 14, 46 Rubber caps 15, 25, 45 Metal cases 16, 26a, 26b Fixing member 21 Positive electrode side electrode body 22 Negative electrode side electrode body 31 Positive electrode side current collector 32 Positive electrode side polarizable electrode layer 33 Negative electrode side current collector 34 Negative electrode side polarizable electrode layer 35 Separator 42 Adhesive tape

Claims (2)

帯状の導電体からなる集電体の表面に分極性電極層が形成された正負一対の電極体と、前記正負一対の電極体の間に介在するセパレータとを渦巻状に巻き回したキャパシタ素子を、電解液とともに金属ケースに封入した構造を有する電気二重層キャパシタにおいて、前記キャパシタ素子と前記金属ケースとの間に、少なくとも一部が前記キャパシタ素子の外周と前記金属ケースの内周に接した状態の、形状記憶合金からなる固定部材が配置されていることを特徴とする電気二重層キャパシタ。   A capacitor element in which a pair of positive and negative electrode bodies each having a polarizable electrode layer formed on the surface of a current collector made of a strip-shaped conductor and a separator interposed between the pair of positive and negative electrode bodies are spirally wound. In the electric double layer capacitor having a structure encapsulated in the metal case together with the electrolyte, at least a part of the capacitor element and the metal case are in contact with the outer periphery of the capacitor element and the inner periphery of the metal case An electric double layer capacitor comprising a fixing member made of a shape memory alloy. 帯状の導電体からなる集電体の表面に分極性電極層を形成して正負一対の電極体を得る工程と、間にセパレータを介在させた状態で、前記正負一対の電極体を渦巻状に巻き回してキャパシタ素子を得る工程と、前記キャパシタ素子の外周に、形状記憶処理を施した形状記憶合金からなるリング状の固定部材を配置した状態で、金属ケースに挿入する工程と、前記固定部材の形状回復により、前記固定部材の少なくとも一部が前記キャパシタ素子の外周を押圧するとともに、前記固定部材の少なくとも一部が前記金属ケースの内周に接することで、前記キャパシタ素子を前記金属ケース内に固定する工程を有することを特徴とする電気二重層キャパシタの製造方法。   Forming a polarizable electrode layer on the surface of a current collector made of a strip-shaped conductor to obtain a pair of positive and negative electrodes, and the pair of positive and negative electrodes in a spiral shape with a separator interposed therebetween A step of winding to obtain a capacitor element, a step of inserting a ring-shaped fixing member made of a shape memory alloy that has undergone shape memory processing around the outer periphery of the capacitor element, and a step of inserting the fixing element into the metal case; By restoring the shape of the capacitor member, at least a part of the fixing member presses the outer periphery of the capacitor element, and at least a part of the fixing member is in contact with the inner periphery of the metal case. A method for producing an electric double layer capacitor, comprising a step of fixing to a capacitor.
JP2004141788A 2004-05-12 2004-05-12 Electric double-layer capacitor and its manufacturing method Pending JP2005327760A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008103672A (en) * 2006-09-20 2008-05-01 Matsushita Electric Ind Co Ltd Capacitor and manufacturing method thereof
WO2011146052A1 (en) * 2010-05-18 2011-11-24 Empire Technology Development Llc Ultracapacitors employing phase change materials
JP5958340B2 (en) * 2010-09-24 2016-07-27 日立化成株式会社 Electric storage device and method for manufacturing electric storage device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008103672A (en) * 2006-09-20 2008-05-01 Matsushita Electric Ind Co Ltd Capacitor and manufacturing method thereof
WO2011146052A1 (en) * 2010-05-18 2011-11-24 Empire Technology Development Llc Ultracapacitors employing phase change materials
US8611069B2 (en) 2010-05-18 2013-12-17 Empire Technology Development Llc Ultracapacitors employing phase change materials
US9123477B2 (en) 2010-05-18 2015-09-01 Empire Technology Development Llc Ultracapacitors employing phase change materials
JP5958340B2 (en) * 2010-09-24 2016-07-27 日立化成株式会社 Electric storage device and method for manufacturing electric storage device

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