JP2005259728A - Electrical double layer capacitor and method therefor - Google Patents

Electrical double layer capacitor and method therefor Download PDF

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JP2005259728A
JP2005259728A JP2004064979A JP2004064979A JP2005259728A JP 2005259728 A JP2005259728 A JP 2005259728A JP 2004064979 A JP2004064979 A JP 2004064979A JP 2004064979 A JP2004064979 A JP 2004064979A JP 2005259728 A JP2005259728 A JP 2005259728A
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double layer
layer capacitor
opening
electric double
outer container
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Kikuko Katou
菊子 加藤
Yasuo Nakahara
康雄 中原
Koichi Nishimura
康一 西村
Mamoru Kimoto
衛 木本
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Sanyo Electric Co Ltd
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Sanyo Electric Co 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
    • Y02E60/13—Energy storage using capacitors

Abstract

<P>PROBLEM TO BE SOLVED: To cause a sealing board to appropriately seal the opening of an outer container in an electrical double layer capacitor comprising a recessed outer container with an electrolytic solution and an electrode body in which at least a separator is provided between a pair of electrodes, and an opening sealed by the sealing board, and consequently to provide the electrical double layer capacitor with a long cycle length that prevents an electrolytic solution from leaking from the electrical double layer capacitor, or moisture from entering into the electrical double layer capacitor. <P>SOLUTION: The electric double layer capacitor has a recessed packaging container 20 with its opening sealed by a sealing plate 30, in which an electrode assembly 1 is housed with a separator 1c between at least a pair of electrodes 1a, 1b, and an electrolytic solution is filled. The recessed container 20 is provided in such a manner as covering the electrode assembly at its opening. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、電気二重層キャパシタに係り、特に、凹状の外装容器内に、少なくとも一対の電極間にセパレータが設けられた電極体と電解液とが収容され、この外装容器の開口部が封口板によって封口されてなる電気二重層キャパシタにおいて、外装容器の開口部が封口板により適切に封口されるようにし、電気二重層キャパシタから電解液が漏れ出したり、水分が電気二重層キャパシタ内に侵入したりするのを防止して、電気二重層キャパシタのサイクル寿命を向上させた点に特徴を有するものである。   The present invention relates to an electric double layer capacitor, and in particular, an electrode body in which a separator is provided between at least a pair of electrodes and an electrolytic solution are accommodated in a concave outer casing, and the opening of the outer casing is a sealing plate. In the electric double layer capacitor that is sealed by the seal, the opening of the outer container is properly sealed by the sealing plate, and the electrolyte leaks from the electric double layer capacitor or moisture enters the electric double layer capacitor. This is characterized in that the cycle life of the electric double layer capacitor is improved.

従来より、電気エネルギーを蓄積するデバイスとして、化学電池以外に、活性炭等の比表面積の大きな電極材料を用いた電極と、電解液とを使用し、上記の電極を対向するように設け、電解液によってヘルムホルツ層と呼ばれる誘電体層を形成するようにした電気二重層キャパシタが知られている。   Conventionally, as a device for accumulating electric energy, in addition to a chemical battery, an electrode using an electrode material having a large specific surface area such as activated carbon and an electrolytic solution are used, and the electrodes are provided so as to face each other. There is known an electric double layer capacitor in which a dielectric layer called a Helmholtz layer is formed.

ここで、このような電気二重層キャパシタは、電解質イオンの移動によってのみ反応が生じるため、酸化還元反応を伴う化学電池に比べて、急速で充放電できるという利点があり、近年、携帯電話や家庭用電気製品のバックアップ用電源や補助電源として用いられるようになった。   Here, such an electric double layer capacitor has a merit that it can be charged / discharged more rapidly than a chemical battery with an oxidation-reduction reaction since a reaction occurs only by the movement of electrolyte ions. It has come to be used as a backup power source and auxiliary power source for electrical appliances.

そして、このような電気二重層キャパシタとしては、一般に、円形状になった一対の金属製の缶体からなるキャパシタ缶内に、一対の電極間にセパレータが設けられた電極体と電解液とを収容させ、この一対の缶体の周囲において絶縁パッキンを介して缶体相互を結合させたコイン型の電気二重層キャパシタが利用されている。   As such an electric double layer capacitor, generally, an electrode body in which a separator is provided between a pair of electrodes and an electrolytic solution are placed in a capacitor can made of a pair of circular metal can bodies. A coin-type electric double layer capacitor is used in which the cans are housed and coupled to each other through an insulating packing around the pair of cans.

ここで、上記のように電気二重層キャパシタを携帯電話や家庭用電気製品のバックアップ用電源や補助電源として用いる場合、プリント基板上に電気二重層キャパシタをハンダ付けして実装させるようになっている。   Here, when the electric double layer capacitor is used as a backup power source or auxiliary power source for a mobile phone or household electric appliance as described above, the electric double layer capacitor is soldered and mounted on the printed circuit board. .

しかし、上記のようなコイン型の電気二重層キャパシタの場合、これをプリント基板上にハンダ付けするためには、各缶体に端子を溶接などによって取り付けておく必要があり、コストなどが高くつき、また上記のようにコイン型の場合、平面形状が円形であるため、無駄になる面積が大きくなるという問題があった。   However, in the case of a coin-type electric double layer capacitor as described above, in order to solder this onto a printed circuit board, it is necessary to attach a terminal to each can body by welding or the like, which is expensive. In addition, in the case of the coin type as described above, since the planar shape is circular, there is a problem that a wasteful area increases.

このため、近年においては、セラミックや樹脂を用いたケースに端子を設け、このケース内に一対の電極間にセパレータが設けられた電極体と電解液とを収容させ、このケースの開口部に封口板を取り付けて、開口部を封口するようにした電気二重層キャパシタが提案されている（例えば、特許文献１参照。）。   Therefore, in recent years, a terminal is provided in a case using ceramic or resin, and an electrode body in which a separator is provided between a pair of electrodes and an electrolytic solution are accommodated in the case, and a sealing is provided in an opening of the case. An electric double layer capacitor has been proposed in which a plate is attached and the opening is sealed (see, for example, Patent Document 1).

ここで、上記の電気二重層キャパシタにおいては、ケースの開口部の周辺に封口板を接着剤で接着させて、ケースの開口部を封口させるようにしていた。   Here, in the above electric double layer capacitor, a sealing plate is adhered around the opening of the case with an adhesive to seal the opening of the case.

しかし、このようにケースの開口部の周辺に封口板を接着剤で接着させただけでは、その接着強度が弱いため、リフローハンダ付けを行う場合や、充放電を繰り返して行った場合等において、熱により電解液が蒸発したり、電解液が分解する等により、ケース内でガスが発生してケース内の内圧が上昇すると、これにより封口部分に隙間が生じて、ケース内から電解液が漏れ出したり、ケース内に水分が侵入したりして、電気二重層キャパシタのサイクル寿命が低下する等の問題があった。   However, just by adhering the sealing plate around the opening of the case with an adhesive, the adhesive strength is weak, so when performing reflow soldering, repeated charging and discharging, etc. When the electrolyte is evaporated by heat or the electrolyte is decomposed, gas is generated in the case and the internal pressure in the case rises. As a result, a gap is created in the sealing portion, and the electrolyte leaks from the case. There is a problem that the cycle life of the electric double layer capacitor is reduced due to the discharge or moisture entering the case.

このため、上記のようなケースの開口部を封口板で封口させるにあたり、熱融着や超音波溶着等によって、ケースの開口部の周辺に封口板を取り付けることも行われている。   For this reason, when sealing the opening of the case with the sealing plate as described above, a sealing plate is also attached around the opening of the case by heat fusion, ultrasonic welding, or the like.

しかし、上記のように熱融着や超音波溶着等によってケースの開口部の周辺に封口板を取り付ける場合、ケース内の電解液が熱融着時における熱によって蒸発したり、超音波溶着時における振動により飛散したりして、ケースの開口部の周辺に電解液が付着し、これによって封口板がケースの開口部の周辺にうまく取り付けられなくなり、上記の場合と同様に、リフローハンダ付けを行う場合や、充放電を繰り返して行った場合等においてケース内の内圧が上昇すると、これにより封口部分に隙間が生じ、ケース内から電解液が漏れ出したり、ケース内に水分が侵入したりして、電気二重層キャパシタのサイクル寿命が低下する等の問題があった。
特開平１１−５４３８７公報 However, when a sealing plate is attached around the opening of the case by heat fusion or ultrasonic welding as described above, the electrolyte in the case evaporates due to heat at the time of heat fusion, or at the time of ultrasonic welding. As a result of splashing due to vibration, the electrolyte adheres to the periphery of the case opening, which prevents the sealing plate from being attached properly around the case opening, and reflow soldering is performed as in the above case. If the internal pressure in the case rises in cases such as when charging and discharging are repeated, this creates a gap in the sealing part, causing electrolyte to leak out of the case or moisture to enter the case. There was a problem that the cycle life of the electric double layer capacitor was lowered.
JP-A-11-54387

この発明は、凹状の外装容器内に、少なくとも一対の電極間にセパレータが設けられた電極体と電解液とが収容され、この外装容器の開口部が封口板により封口されてなる電気二重層キャパシタにおいて、外装容器の開口部が封口板によって適切に封口されるようにして、電気二重層キャパシタから電解液が漏れ出したり、水分が電気二重層キャパシタ内に侵入したりするのを防止し、サイクル寿命に優れた電気二重層キャパシタが得られるようにすることを課題とするものである。   The present invention relates to an electric double layer capacitor in which an electrode body in which a separator is provided between at least a pair of electrodes and an electrolytic solution are housed in a concave outer container, and an opening of the outer container is sealed by a sealing plate In order to prevent the electrolyte from leaking out from the electric double layer capacitor and moisture from entering the electric double layer capacitor, the opening of the outer container is appropriately sealed by the sealing plate. An object of the present invention is to obtain an electric double layer capacitor having an excellent lifetime.

この発明においては、上記のような課題を解決するため、凹状の外装容器内に、少なくとも一対の電極間にセパレータが設けられた電極体と電解液とが収容され、この外装容器の開口部が封口板により封口されてなる電気二重層キャパシタにおいて、上記の外装容器の開口部側において上記の電極体を覆うようにして、凹状の被覆体を設けたのである。   In the present invention, in order to solve the above-described problems, an electrode body in which a separator is provided between at least a pair of electrodes and an electrolytic solution are accommodated in a concave outer casing, and an opening of the outer casing is formed. In the electric double layer capacitor that is sealed by the sealing plate, the concave covering body is provided so as to cover the electrode body on the opening side of the outer packaging container.

そして、この電気二重層キャパシタのように、凹状の外装容器の開口部側において電極体を覆うようにして、凹状の被覆体を設けると、外装容器の開口部の周辺に封口板を熱融着や超音波溶着等により取り付けて、外装容器の開口部を封口させる場合に、熱融着時における熱によって電解液が蒸発したり、超音波溶着時における振動により電解液が飛散したりして、電解液が外装容器の開口部の周辺に付着するのが抑制されるようになり、外装容器の開口部が封口板によって適切に封口されるようになる。   Then, like this electric double layer capacitor, when a concave covering body is provided so as to cover the electrode body on the opening side of the concave outer container, a sealing plate is thermally fused around the opening of the outer container. Or by ultrasonic welding or the like, and sealing the opening of the outer container, the electrolyte solution evaporates due to heat at the time of thermal fusion, or the electrolyte solution scatters by vibration at the time of ultrasonic welding, The electrolyte is prevented from adhering to the periphery of the opening of the outer container, and the opening of the outer container is appropriately sealed by the sealing plate.

ここで、この電気二重層キャパシタにおいて、上記の電極の材料としては、例えば、活性炭粉末、活性炭繊維、黒鉛、炭素繊維、コークス、アセチレンブラック，ケッチェンブラック等のカーボンブラック、カーボンナノチューブ、カーボンナノホーン、フラーレン等の炭素材料を用いることができ、特に、電極と電解液との接触面積を広くして、高容量の電気二重層キャパシタが得られるようにするためには、活性炭粉末、活性炭繊維、カーボンナノチューブ、カーボンナノホーン、フラーレン等を用いることが好ましい。   Here, in the electric double layer capacitor, as the material of the electrode, for example, activated carbon powder, activated carbon fiber, graphite, carbon fiber, coke, acetylene black, ketjen black and other carbon black, carbon nanotube, carbon nanohorn, Carbon materials such as fullerenes can be used. In particular, in order to increase the contact area between the electrode and the electrolyte and to obtain a high-capacity electric double layer capacitor, activated carbon powder, activated carbon fiber, carbon Nanotubes, carbon nanohorns, fullerenes and the like are preferably used.

また、この電気二重層キャパシタにおいて、上記の凹状の被覆体によって上記の電極体における外装容器の開口部側の面及び側壁面を覆うようにすると、上記のように、熱融着時における熱によって電解液が蒸発したり、超音波溶着時における振動により電解液が飛散したりして、電解液が外装容器の開口部の周辺に付着するのがより一層抑制され、外装容器の開口部が封口板によってより適切に封口されるようになる。   Further, in this electric double layer capacitor, when the surface of the opening side of the outer container and the side wall surface of the electrode body are covered with the concave covering body, as described above, by the heat at the time of heat fusion The electrolytic solution evaporates, or the electrolytic solution is scattered by vibration during ultrasonic welding, and the electrolytic solution is further prevented from adhering to the periphery of the opening of the outer container, and the opening of the outer container is sealed. The board will be sealed more appropriately.

また、この発明においては、上記のような電気二重層キャパシタを製造するにあたり、凹状の被覆体内に少なくとも一対の電極間にセパレータが設けられた電極体を収容させると共にこの電極体に電解液を供給する工程と、被覆体の開口部が凹状の外装容器内の底面側に向くようにして上記の被覆体を外装容器内に収容させる工程と、外装容器の開口部を封口板で封口させる工程とを行うようにすることが好ましい。   In the present invention, in manufacturing the electric double layer capacitor as described above, an electrode body in which a separator is provided between at least a pair of electrodes is accommodated in a concave covering body and an electrolytic solution is supplied to the electrode body. A step of accommodating the covering body in the outer container so that the opening of the covering body faces the bottom surface in the concave outer container, and a step of sealing the opening of the outer container with a sealing plate, It is preferable to carry out.

このようにして電気二重層キャパシタを製造すると、電解液が適切に電極体に供給されるようになると共に、電気二重層キャパシタの製造時に電解液がこぼれるのも抑制される。   When the electric double layer capacitor is manufactured in this manner, the electrolytic solution is appropriately supplied to the electrode body, and the electrolytic solution is prevented from spilling during the manufacturing of the electric double layer capacitor.

この発明における電気二重層キャパシタのように、凹状の外装容器の開口部側において電極体を覆うようにして、凹状の被覆体を設けると、上記のように外装容器の開口部の周辺に封口板を熱融着や超音波溶着等により取り付ける場合に、電解液が外装容器の開口部の周辺に付着するのが抑制されて、外装容器の開口部が封口板によって適切に封口されるようになる。   As in the electric double layer capacitor according to the present invention, when the concave covering is provided so as to cover the electrode body on the opening side of the concave outer container, the sealing plate is provided around the opening of the outer container as described above. Is attached by heat sealing, ultrasonic welding, etc., the electrolyte is prevented from adhering to the periphery of the opening of the outer container, and the opening of the outer container is properly sealed by the sealing plate. .

この結果、この発明における電気二重層キャパシタにおいては、リフローハンダ付けを行う場合や充放電を繰り返して行った場合等において、熱により電解液が蒸発したり、電解液が分解する等により、電気二重層キャパシタ内でガスが発生して内圧が上昇しても、これにより封口部に隙間が生じるのが防止され、電気二重層キャパシタ内から電解液が漏れ出したり、水分が侵入するのが抑制されるようになり、従来の電気二重層キャパシタに比べて、サイクル寿命が向上する。   As a result, in the electric double layer capacitor according to the present invention, when reflow soldering is performed or charging / discharging is repeated, the electrolytic solution is evaporated by heat, or the electrolytic solution is decomposed. Even if gas is generated in the multi-layer capacitor and the internal pressure rises, this prevents a gap from being generated in the sealing portion, and prevents the electrolyte from leaking out or moisture from entering the electric double layer capacitor. Thus, the cycle life is improved as compared with the conventional electric double layer capacitor.

以下、この発明に係る電気二重層キャパシタ及びその製造方法を、実施例を挙げて具体的に説明すると共に、この実施例における電気二重層キャパシタにおいては、外装容器の開口部が封口板によって適切に封口されて、サイクル寿命が向上することを、比較例を挙げて明らかにする。なお、この発明に係る電気二重層キャパシタ及びその製造方法は、下記の実施例に示したものに限定されるものではなく、その要旨を変更しない範囲において、適宜変更して実施することができるものである。   Hereinafter, the electric double layer capacitor and the manufacturing method thereof according to the present invention will be specifically described with reference to examples. In the electric double layer capacitor in this example, the opening of the outer container is appropriately formed by a sealing plate. It will be clarified by a comparative example that the cycle life is improved by sealing. The electric double layer capacitor and the manufacturing method thereof according to the present invention are not limited to those shown in the following examples, and can be implemented with appropriate modifications within a range not changing the gist thereof. It is.

（実施例１）
実施例１の電気二重層キャパシタにおいては、電極を下記のようにして作製すると共に電解液を下記のようにして調製し、図１に示すような電気二重層キャパシタを作製した。 (Example 1)
In the electric double layer capacitor of Example 1, an electrode was prepared as follows and an electrolyte was prepared as follows to prepare an electric double layer capacitor as shown in FIG.

ここで、電極を作製するにあたっては、電極材料として比表面積が２０００ｍ2／ｇの活性炭粉末を用い、この活性炭粉末１００重量部に、アセチレンブラックを５重量部、ポリテトラフルオロエチレン（ＰＴＦＥ）を５重量部の割合で加えて、これらを混練し、これを加圧成形して、厚みが１．０ｍｍ、一辺の長さが３．５ｍｍの正方形状になった一対の電極１ａ，１ｂを作製した。 Here, in producing the electrode, an activated carbon powder having a specific surface area of 2000 m 2 / g was used as an electrode material, 5 parts by weight of acetylene black and 5 parts of polytetrafluoroethylene (PTFE) were added to 100 parts by weight of the activated carbon powder. These were kneaded and added under a ratio of parts by weight, and this was pressure-molded to produce a pair of electrodes 1a and 1b having a square shape with a thickness of 1.0 mm and a side length of 3.5 mm. .

また、電解液を調製するにあたっては、非水系溶媒のプロピレンカーボネートに溶質のテトラエチルアンモニウムテトラフルオロボレート（Ｃ2Ｈ5）4ＮＢＦ4を１ｍｏｌ／ｌの濃度になるように溶解させて電解液を調製した。 In preparing the electrolytic solution, the electrolytic solution is prepared by dissolving solute tetraethylammonium tetrafluoroborate (C 2 H 5 ) 4 NBF 4 in a non-aqueous solvent propylene carbonate to a concentration of 1 mol / l. did.

また、セパレータ１ｃとしては、ガラス繊維製のものを用いるようにした。   The separator 1c is made of glass fiber.

また、凹状の外装容器１０としては、一辺の長さが５ｍｍの正方形状で、高さが２．５ｍｍであり、開口部の一辺の長さが４．５ｍｍの正方形状で、収容部の深さが２．２５ｍｍになったアルミナ製の絶縁性容器であって、その収容部の底部に金めっきを施したタングステンからなる集電体１１を設け、この集電体１１と接触するようにして側壁を貫通してその底面に伸びた一方の接続端子１２ｂを設けると共に、上記の開口部の周辺から底面に伸びた他方の接続端子１２ａを設けたものを用いるようにした。   The concave outer container 10 has a square shape with a side length of 5 mm, a height of 2.5 mm, and a square shape with a side length of 4.5 mm. An insulating container made of alumina having a thickness of 2.25 mm, and provided with a current collector 11 made of tungsten plated with gold at the bottom of the housing portion, and in contact with the current collector 11 One connection terminal 12b that penetrates the side wall and extends to the bottom surface is provided, and the other connection terminal 12a that extends from the periphery of the opening to the bottom surface is used.

また、被覆体２０としては、開口部の一辺の長さが４ｍｍの正方形状で、収容部の深さが１．８ｍｍになった厚みが０．２ｍｍのアルミニウム製の導電性容器を用い、また封口板３０としては、厚さが０．２５ｍｍのアルミニウム製の導電性板を用いるようにした。   Further, as the covering 20, an aluminum conductive container having a square shape with a side length of 4 mm and an accommodating portion depth of 1.8 mm and a thickness of 0.2 mm is used. As the sealing plate 30, an aluminum conductive plate having a thickness of 0.25 mm was used.

そして、実施例１の電気二重層キャパシタを作製するにあたっては、上記の一対の電極１ａ，１ｂ間に上記のセパレータ１ｃを挟み込んだ電極体１を、上記の被覆体２０の収容部内に収容させ、一対の電極１ａを被覆体２０に接触させると共に、この被覆体２０の収容部内に上記の電解液を十分に注液させた。   And in producing the electric double layer capacitor of Example 1, the electrode body 1 in which the separator 1c is sandwiched between the pair of electrodes 1a and 1b is accommodated in the accommodating portion of the covering body 20, While making a pair of electrode 1a contact the coating | coated body 20, said electrolyte solution was fully poured in the accommodating part of this coating | coated body 20. As shown in FIG.

次いで、この被覆体２０の開口部が上記の外装容器１０における収容部の底面側に向くようにして、電極体１が収容された被覆体２０を外装容器１０の収容部内に収容させ、他方の電極１ｂを外装容器１０の収容部の底部に設けられた集電体１１に接触させるようにした。   Next, the covering body 20 in which the electrode body 1 is accommodated is accommodated in the accommodating portion of the outer container 10 so that the opening of the covering body 20 faces the bottom surface side of the accommodating portion in the outer container 10. The electrode 1b was brought into contact with the current collector 11 provided at the bottom of the housing part of the outer container 10.

その後、上記の外装容器１０の開口部を閉塞させるようにして、上記の封口板３０を外装容器１０の開口部側に配し、この封口板３０を外装容器１０の開口部の周辺部に熱融着させて、外装容器１０の開口部を封口させると共に、この封口板３０を上記の被覆体２０に密接させるようにした。   Thereafter, the sealing plate 30 is disposed on the opening side of the outer container 10 so as to close the opening of the outer container 10, and the sealing plate 30 is heated to the periphery of the opening of the outer container 10. It was made to fuse | melt and the opening part of the exterior container 10 was sealed, and this sealing board 30 was made to closely_contact | adhere to said coating | coated body 20. FIG.

（実施例２）
実施例２の電気二重層キャパシタにおいては、図２に示すように、被覆体２０として、開口部の一辺の長さが４ｍｍの正方形状で、収容部の深さが１．０ｍｍになった厚みが０．２ｍｍのアルミニウム製の導電性容器を用いるようにし、それ以外は、上記の実施例１と同じものを使用するようにした。 (Example 2)
In the electric double layer capacitor of Example 2, as shown in FIG. 2, the covering 20 has a square shape with a length of one side of the opening of 4 mm and a depth of the housing portion of 1.0 mm. Is made of a conductive container made of aluminum having a thickness of 0.2 mm, and the other is the same as in Example 1 above.

そして、この実施例２においては、電気二重層キャパシタを作製するにあたり、上記の被覆体２０の収容部内に一方の電極１ａを収容させる一方、上記の外装容器１０の収容部内に他方の電極１ｂとセパレータ１ｃとを収容させ、外装容器１０の収容部の底部に設けられた集電体１１に他方の電極１ｂを接触させると共に、この外装容器１０の収容部内に上記の電解液を十分に注液させた。   And in this Example 2, when producing an electric double layer capacitor, while one electrode 1a is accommodated in the accommodating part of said covering 20, the other electrode 1b is accommodated in the accommodating part of said exterior container 10 The separator 1c is accommodated, and the other electrode 1b is brought into contact with the current collector 11 provided at the bottom of the accommodating portion of the outer container 10, and the electrolyte solution is sufficiently injected into the accommodating portion of the outer container 10 I let you.

次いで、電極１ａが収容された被覆体２０をその開口部が外装容器１０における収容部の底面側に向くようにして、この被覆体２０を外装容器１０の収容部内に収容させて、電極１ａと電極１ｂとの間にセパレータ１ｃを挟みこみ、この状態で、上記の実施例１の場合と同様に、封口板３０を外装容器１０の開口部の周辺部に熱融着させて、外装容器１０の開口部を封口させると共に、この封口板３０を上記の被覆体２０に密接させるようにした。   Next, the covering body 20 in which the electrode 1a is housed is accommodated in the housing portion of the exterior container 10 so that the opening thereof faces the bottom surface side of the housing section in the exterior container 10, and the electrode 1a and The separator 1c is sandwiched between the electrode 1b, and in this state, the sealing plate 30 is heat-sealed to the peripheral portion of the opening of the outer container 10 in the same manner as in the first embodiment, so that the outer container 10 The sealing plate 30 was brought into intimate contact with the covering body 20.

（比較例１）
比較例１の電気二重層キャパシタにおいては、図３に示すように、被覆体２０を用いずに、上記の封口板３０と上記の電極１ａとの間に、一辺の長さが４ｍｍの正方形状で、厚みが０．２ｍｍになったアルミニウム製の集電板１３を設けるようにし、それ以外は、上記の実施例１と同じものを使用するようにした。 (Comparative Example 1)
In the electric double layer capacitor of Comparative Example 1, as shown in FIG. 3, a square shape having a side length of 4 mm is formed between the sealing plate 30 and the electrode 1a without using the covering 20. Then, an aluminum current collector plate 13 having a thickness of 0.2 mm was provided, and the other components were the same as those in Example 1 above.

ここで、この比較例１の電気二重層キャパシタを作製するにあたっては、上記の一対の電極１ａ，１ｂ間に上記のセパレータ１ｃを挟み込んだ電極体１を外装容器１０の収容部内に収容させて、この収容部の底部に設けられた集電体１１に他方の電極１ｂを接触させると共に、この外装容器１０の収容部内に上記の電解液を十分に注液させた。   Here, in producing the electric double layer capacitor of Comparative Example 1, the electrode body 1 in which the separator 1c is sandwiched between the pair of electrodes 1a and 1b is housed in the housing portion of the outer container 10, The other electrode 1b was brought into contact with the current collector 11 provided at the bottom of the housing portion, and the electrolyte solution was sufficiently injected into the housing portion of the outer container 10.

そして、一方の電極１ａと接触するようにして上記の集電板１３を外装容器１０の収容部内に収容させ、この状態で、上記の実施例１の場合と同様に、封口板３０を外装容器１０の開口部の周辺部に熱融着させて、外装容器１０の開口部を封口させると共に、この封口板３０を上記の集電板１３に密接させるようにした。   Then, the current collecting plate 13 is accommodated in the accommodating portion of the outer container 10 so as to be in contact with one of the electrodes 1a, and in this state, the sealing plate 30 is disposed in the outer container as in the case of the first embodiment. The opening portion of the outer container 10 was sealed by heat sealing around the periphery of the opening portion 10, and the sealing plate 30 was brought into close contact with the current collector plate 13.

次に、上記のようにして作製した実施例１，２及び比較例１の各電気二重層キャパシタを、１７０℃で５分間、２６０℃で１分間加熱させる熱処理を３回行った。   Next, each of the electric double layer capacitors of Examples 1 and 2 and Comparative Example 1 produced as described above was heat-treated 3 times by heating at 170 ° C. for 5 minutes and 260 ° C. for 1 minute.

その後、上記の各電気二重層キャパシタを、６０℃の雰囲気中において、３．３Ｖの一定電圧で１時間充電させた後、２ｍＡの一定電流で１．０Ｖまで放電させて１サイクル目の放電容量を求め、このような充放電サイクルを最高２００サイクルまで行い、放電容量が１サイクル目の放電容量の５０％以下になるまでのサイクル数を求め、これをサイクル寿命として下記の表１に示した。なお、実施例１の電気二重層キャパシタにおいては、２００サイクル時点においても放電容量が１サイクル目の放電容量の５０％以下に低下しなかった。   Thereafter, each of the electric double layer capacitors was charged at a constant voltage of 3.3 V for 1 hour in an atmosphere at 60 ° C., and then discharged to 1.0 V at a constant current of 2 mA to discharge the first cycle. Such charge / discharge cycles were performed up to 200 cycles, and the number of cycles until the discharge capacity became 50% or less of the discharge capacity of the first cycle was determined. This is shown in Table 1 below as the cycle life. . In the electric double layer capacitor of Example 1, the discharge capacity did not decrease to 50% or less of the discharge capacity at the first cycle even at the 200th cycle.

Figure 2005259728
Figure 2005259728

この結果、一対の電極１ａ，１ｂ間に上記のセパレータ１ｃを挟み込んだ電極体１を外装容器１０の収容部内に収容させると共に、外装容器１０の開口部側において上記の電極体１を覆うようにして被覆体２０を設けた実施例１，２の電気二重層キャパシタは、被覆体２０を設けていない比較例１の電気二重層キャパシタに比べてサイクル寿命が大幅に向上していた。特に、収容部の深さが深い被覆体２０を用いた実施例１の電気二重層キャパシタにおいては、封口板３０を熱融着させて外装容器１０の開口部を封口させる場合などに、電解液が外装容器１０の開口部の周辺部に付着するのが一層抑制され、サイクル寿命がさらに大幅に向上した。   As a result, the electrode body 1 in which the separator 1c is sandwiched between the pair of electrodes 1a and 1b is housed in the housing portion of the outer container 10, and the electrode body 1 is covered on the opening side of the outer container 10. Thus, the electric double layer capacitors of Examples 1 and 2 provided with the covering 20 had a significantly improved cycle life as compared with the electric double layer capacitor of Comparative Example 1 where the covering 20 was not provided. In particular, in the electric double layer capacitor of Example 1 using the covering 20 having a deep housing portion, the electrolytic solution is used when the sealing plate 30 is heat-sealed to seal the opening of the outer container 10. Is further suppressed from adhering to the periphery of the opening of the outer container 10, and the cycle life is further greatly improved.

この発明の実施例１において作製した電気二重層キャパシタの概略断面図である。It is a schematic sectional drawing of the electric double layer capacitor produced in Example 1 of this invention. この発明の実施例２において作製した電気二重層キャパシタの概略断面図である。It is a schematic sectional drawing of the electric double layer capacitor produced in Example 2 of this invention. 比較例１において作製した電気二重層キャパシタの概略断面図である。6 is a schematic cross-sectional view of an electric double layer capacitor produced in Comparative Example 1. FIG.

符号の説明Explanation of symbols

１ 電極体
１ａ，１ｂ 電極
１ｃ セパレータ
１０ 外装容器
１１ 集電体
１２ａ，１２ｂ 接続端子
１３ 集電体
２０ 被覆体
３０ 封口板 DESCRIPTION OF SYMBOLS 1 Electrode body 1a, 1b Electrode 1c Separator 10 Exterior container 11 Current collector 12a, 12b Connection terminal 13 Current collector 20 Cover body 30 Sealing plate

Claims (4)

凹状の外装容器内に、少なくとも一対の電極間にセパレータが設けられた電極体と電解液とが収容され、この外装容器の開口部が封口板により封口されてなる電気二重層キャパシタにおいて、上記の外装容器の開口部側において上記の電極体を覆うようにして、凹状の被覆体を設けたことを特徴とする電気二重層キャパシタ。   An electric double layer capacitor in which an electrode body in which a separator is provided between at least a pair of electrodes and an electrolytic solution are accommodated in a concave outer container, and an opening of the outer container is sealed by a sealing plate. An electric double layer capacitor characterized in that a concave covering is provided so as to cover the electrode body on the opening side of the outer container. 請求項１に記載した電気二重層キャパシタにおいて、上記の電極に炭素材料を用いたことを特徴とする電気二重層キャパシタ。   2. The electric double layer capacitor according to claim 1, wherein a carbon material is used for the electrode. 請求項１又は請求項２に記載した電気二重層キャパシタにおいて、上記の電極体における外装容器の開口部側の面及び側壁面が上記の凹状の被覆体によって覆われていることを特徴とする電気二重層キャパシタ。   3. The electric double layer capacitor according to claim 1, wherein a surface and a side wall surface of the outer casing of the electrode body are covered with the concave covering body. Double layer capacitor. 凹状の被覆体内に少なくとも一対の電極間にセパレータが設けられた電極体を収容させると共にこの電極体に電解液を供給する工程と、被覆体の開口部が凹状の外装容器内の底面側に向くようにして上記の被覆体を外装容器内に収容させる工程と、外装容器の開口部を封口板で封口させる工程と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。   A step of accommodating an electrode body in which a separator is provided between at least a pair of electrodes in a concave covering body and supplying an electrolytic solution to the electrode body, and an opening portion of the covering body facing a bottom side in the concave outer casing Thus, the manufacturing method of the electrical double layer capacitor characterized by having the process of accommodating said coating | covering body in an exterior container, and the process of sealing the opening part of an exterior container with a sealing board.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011100998A (en) * 2009-11-05 2011-05-19 Samsung Electro-Mechanics Co Ltd Chip-type electric double layer capacitor and method of manufacturing the same
CN101789316B (en) * 2009-01-21 2013-05-08 精工电子有限公司 Electrochemical cell and method of manufacturing electrochemical cell
KR101356791B1 (en) * 2012-01-20 2014-01-27 한국과학기술원 film-type supercapacitors and method for fabricating the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101789316B (en) * 2009-01-21 2013-05-08 精工电子有限公司 Electrochemical cell and method of manufacturing electrochemical cell
JP2011100998A (en) * 2009-11-05 2011-05-19 Samsung Electro-Mechanics Co Ltd Chip-type electric double layer capacitor and method of manufacturing the same
US9236198B2 (en) 2009-11-05 2016-01-12 Samsung Electro-Mechanics Co., Ltd. Chip-type electric double layer capacitor cell and method of manufacturing the same
KR101356791B1 (en) * 2012-01-20 2014-01-27 한국과학기술원 film-type supercapacitors and method for fabricating the same
US8951306B2 (en) 2012-01-20 2015-02-10 Korea Advanced Institute Of Science And Technology Film-type supercapacitor and manufacturing method thereof

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