JP2009117759A - Electric double-layer capacitor - Google Patents

Electric double-layer capacitor Download PDF

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JP2009117759A
JP2009117759A JP2007292003A JP2007292003A JP2009117759A JP 2009117759 A JP2009117759 A JP 2009117759A JP 2007292003 A JP2007292003 A JP 2007292003A JP 2007292003 A JP2007292003 A JP 2007292003A JP 2009117759 A JP2009117759 A JP 2009117759A
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electric double
double layer
layer capacitor
capacitor
insulating film
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Masahiro Murata
正浩 村田
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Tokin Corp
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NEC Tokin 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
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    • Y02E60/13—Energy storage using capacitors

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric double-layer capacitor, wherein the thickness of the whole electric double-layer capacitor is made thinner as compared with a conventional one even when two or more capacitor elements to be covered with a housing are connected in series. <P>SOLUTION: A plurality of capacitor elements each of which is constituted of oppositely arranging a pair of polarizable electrodes 11, each of which is composed of a positive pole and a negative pole, through a separator 12 are connected in series by mutually welding lead terminals 15 partially projected from laminate films 16 in the same direction, and the plurality of capacitor elements each is arranged in each cell partitioned by a thermoplastic insulating film 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、高い耐電圧を有する電気二重層キャパシタに関する。   The present invention relates to an electric double layer capacitor having a high withstand voltage.

電気二重層キャパシタは、Ｎｉ水素二次電池やＬｉイオン二次電池などの二次電池と比べ、急速に充電ができ、大電流で放電することができると共に、１万回以上の充放電を繰り返しても、特性が劣化しないなど、従来の二次電池にはない特長を有している。このため、近年、二次電池の代替用または補助用の電力供給電源として、電気二重層キャパシタに対する期待が高まっている。   Electric double layer capacitors can be charged quickly and discharged with a large current compared to secondary batteries such as Ni-hydrogen secondary batteries and Li-ion secondary batteries, and are repeatedly charged and discharged 10,000 times or more. However, it has features that are not found in conventional secondary batteries, such as no deterioration in characteristics. For this reason, in recent years, there is an increasing expectation for an electric double layer capacitor as an alternative or auxiliary power supply power source for a secondary battery.

図２は、従来の電気二重層キャパシタの断面図である。電気二重層キャパシタは、正極および負極からなる一対の分極性電極２１、セパレータ２２、集電体２３、電解液２４、リード端子２５、外装体として主に使用されるラミネートフィルム２６から構成される。   FIG. 2 is a cross-sectional view of a conventional electric double layer capacitor. The electric double layer capacitor includes a pair of polarizable electrodes 21 composed of a positive electrode and a negative electrode, a separator 22, a current collector 23, an electrolytic solution 24, a lead terminal 25, and a laminate film 26 mainly used as an exterior body.

電気二重層キャパシタは、活性炭を主成分とする分極性電極層を有する一対の分極性電極がセパレータを介して対向配置されることでキャパシタ素子が構成され、この分極性電極には電解液が含浸されている。これにより、上記分極性電極層と電解液との界面に電気二重層が形成される。電気二重層キャパシタに電圧が印加されると、電気二重層の静電容量に従い電荷が蓄積される（例えば、特許文献１参照）。   In an electric double layer capacitor, a pair of polarizable electrodes having a polarizable electrode layer mainly composed of activated carbon is arranged opposite to each other with a separator interposed therebetween, and this polarizable electrode is impregnated with an electrolytic solution. Has been. Thereby, an electric double layer is formed at the interface between the polarizable electrode layer and the electrolytic solution. When a voltage is applied to the electric double layer capacitor, charges are accumulated according to the capacitance of the electric double layer (see, for example, Patent Document 1).

図３は、従来の電気二重層キャパシタを直列に接続した場合の断面図である。図２に示した第１の電気二重層キャパシタのリード端子３５の一端と、別の第２の電気二重層キャパシタのリード端子３５の一端とを溶接にて接続している。図３に示すように、第１の電気二重層キャパシタと第２の電気二重層キャパシタは、接着剤３８を挟んで直列に接続されている。図２のような、これら単一の電気二重層キャパシタの耐電圧は１つのキャパシタ素子当たり２．３〜２．７Ｖであるため、それ以上の電圧で使用する際は、一般的に、図３のように外装済み電気二重層キャパシタを２個以上直列に接続することが必要である（例えば、特許文献２参照）。   FIG. 3 is a cross-sectional view of a conventional electric double layer capacitor connected in series. One end of the lead terminal 35 of the first electric double layer capacitor shown in FIG. 2 and one end of the lead terminal 35 of another second electric double layer capacitor are connected by welding. As shown in FIG. 3, the first electric double layer capacitor and the second electric double layer capacitor are connected in series with an adhesive 38 interposed therebetween. Since the withstand voltage of these single electric double layer capacitors as shown in FIG. 2 is 2.3 to 2.7 V per capacitor element, generally, when used at a higher voltage, FIG. Thus, it is necessary to connect two or more packaged electric double layer capacitors in series (see, for example, Patent Document 2).

特開２００２−７５８０１号公報JP 2002-75801 A 特開２００２−１９８２７１号公報JP 2002-198271 A

しかしながら、図３のように、電気二重層キャパシタを直列に接続させる場合、直列した数だけ、電気二重層キャパシタのユニットの厚みが増すという問題がある。特に、小型の携帯電気製品では電気二重層キャパシタの厚み寸法は大変重要であり、薄型化の要求は非常に大きい。   However, as shown in FIG. 3, when the electric double layer capacitors are connected in series, there is a problem that the thickness of the electric double layer capacitor unit is increased by the number in series. In particular, the thickness of the electric double layer capacitor is very important for small portable electric products, and the demand for thinning is very large.

本発明は、上記の点に鑑みてなされたもので、外装体で覆われる内部のキャパシタ素子を２個以上直列接続しても、電気二重層キャパシタ全体の厚みが従来よりも薄型となる電気二重層キャパシタを提供することを目的とする。   The present invention has been made in view of the above points. Even when two or more internal capacitor elements covered with an exterior body are connected in series, the electric double layer capacitor has a thickness that is thinner than before. An object is to provide a multilayer capacitor.

本発明は、正極および負極からなる一対の分極性電極がセパレータを介して対向配置されたキャパシタ素子を外装体にて封止した電気二重層キャパシタであって、
前記外装体と絶縁性フィルムを有し、
前記外装体の内部は前記絶縁性フィルムで仕切られ、
仕切られた内部にリード端子の接続された前記キャパシタ素子が配置され、
前記リード端子の一部が突出して外装体にて封止され、
突出した前記リード端子が接続されることで前記キャパシタ素子が複数個直列に接続されたことを特徴とする電気二重層キャパシタである。 The present invention is an electric double layer capacitor in which a capacitor element in which a pair of polarizable electrodes composed of a positive electrode and a negative electrode are arranged to face each other with a separator sealed with an exterior body,
Having the outer package and an insulating film;
The interior of the exterior body is partitioned by the insulating film,
The capacitor element connected to the lead terminal is arranged in the partitioned interior,
A part of the lead terminal protrudes and is sealed with an exterior body,
The electric double layer capacitor is characterized in that a plurality of the capacitor elements are connected in series by connecting the protruding lead terminals.

また、本発明は、前記絶縁性フィルムが熱可塑性樹脂であることを特徴とする電気二重層キャパシタである。   The present invention is the electric double layer capacitor, wherein the insulating film is a thermoplastic resin.

また、本発明は、前記絶縁性フィルムがポリプロピレン樹脂または酸変性ポリプロピレン樹脂であることを特徴とする電気二重層キャパシタである。   The present invention is the electric double layer capacitor, wherein the insulating film is a polypropylene resin or an acid-modified polypropylene resin.

本発明によれば、一つの外装体の中でキャパシタ素子を複数個直列に接続することができるため、従来の接続方法と比較して、外装体厚み×Ｎ＋（接着剤厚み−絶縁性フィルム厚み）×（Ｎ−１）（Ｎ：直列数）だけの厚み寸法を小さくすることができ、耐電圧の大きな電気二重層キャパシタの薄型化を実現することが可能となる。   According to the present invention, since a plurality of capacitor elements can be connected in series in one exterior body, the exterior body thickness × N + (adhesive thickness−insulating film thickness) compared to the conventional connection method. ) × (N−1) (N: the number in series) can be reduced, and the electric double layer capacitor having a large withstand voltage can be thinned.

以下、図面に基づいて本発明の好適な実施の形態について詳細に説明する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本実施の形態に係る電気二重層キャパシタの断面図である。図１の電気二重層キャパシタは、正極および負極からなる一対の分極性電極１１、セパレータ１２、集電体１３、電解液１４、リード端子１５で形成された２個のキャパシタ素子が熱可塑性絶縁性フィルム１８で仕切られて、一緒に外装体として主に使用されるラミネートフィルム１６で封止されて構成される。   FIG. 1 is a cross-sectional view of the electric double layer capacitor according to the present embodiment. In the electric double layer capacitor of FIG. 1, two capacitor elements formed by a pair of polarizable electrodes 11 consisting of a positive electrode and a negative electrode, a separator 12, a current collector 13, an electrolytic solution 14, and a lead terminal 15 are thermoplastic insulating. The film is partitioned by a film 18 and sealed together with a laminate film 16 that is mainly used as an exterior body.

ここで、本発明の電気二重層コンデンサに用いる材料について説明する。   Here, materials used for the electric double layer capacitor of the present invention will be described.

分極性電極は主として炭素材料で構成されており、炭素材料にはフェノール樹脂系活性炭、やしがら系活性炭、石油コークス系活性炭やポリアセンなどを用いるとよい。また、活性炭としては、大容量で低内部抵抗の電気二重層キャパシタが得られるように、粉末の場合は平均粒径が２０μｍ以下で、比表面積が１０００〜３０００ｍ2／ｇの活性炭を使用するのが好ましい。 The polarizable electrode is mainly composed of a carbon material. As the carbon material, phenol resin-based activated carbon, coconut-based activated carbon, petroleum coke-based activated carbon, polyacene, or the like may be used. As the activated carbon, activated carbon having an average particle size of 20 μm or less and a specific surface area of 1000 to 3000 m 2 / g is used in the case of powder so that an electric double layer capacitor having a large capacity and a low internal resistance can be obtained. Is preferred.

分極性電極には、必要に応じて導電助剤が添加される。導電助剤としては、黒鉛、カーボンブラック、気相成長カーボンやカーボンナノチューブなどが好ましく、特に、黒鉛、カーボンブラックが好ましい。また、場合によっては、分極性電極にバインダが添加されるが、このバインダには有機溶媒系電解液に対して耐薬品性を有し、キャパシタ特性に影響を及ぼさないものを選択すればよく、一般にはポリフッ化ビニリデンやポリテトラフルオロエチレンなどを用いるのが好ましい。   If necessary, a conductive additive is added to the polarizable electrode. As the conductive aid, graphite, carbon black, vapor-grown carbon, carbon nanotube, and the like are preferable, and graphite and carbon black are particularly preferable. In some cases, a binder is added to the polarizable electrode, and this binder may be selected from those having chemical resistance to the organic solvent electrolyte and not affecting the capacitor characteristics. In general, it is preferable to use polyvinylidene fluoride or polytetrafluoroethylene.

セパレータには、例えば、電気二重層キャパシタ用として、レーヨン系抄紙、ガラス繊維混抄紙やポリプロピレン不織布などが使用できる。   For the separator, for example, rayon papermaking, glass fiber mixed paper, polypropylene nonwoven fabric, etc. can be used for electric double layer capacitors.

集電体用の材料は、使用する電気二重層キャパシタの特性に応じて適宜選択すればよく、アルミニウム、ステンレス、銅やニッケル等が使用されるが、特にアルミニウムが好ましい。集電体に電極層を形成する方法は従来の方法でよく、電極層に用いる部材を溶媒に分散させてスラリとし、低抵抗とするために表面エッチング処理を行った集電体に塗工すればよい。塗工法としては一般に、メタルマスク印刷法、静電塗装法、ディップコート法、スプレーコート法、ロールコート法、ドクターブレード法、グラビアコート法、スクリーン印刷法等が使用されている。その後、必要に応じて、平板プレス、カレンダーロール等により圧延処理を行ってもよい。また、塗工法以外にも押し出し法によりシート状の電極を形成し、次いで集電体に導電性接着剤を用いて一体化する方法でもよい。   The material for the current collector may be appropriately selected according to the characteristics of the electric double layer capacitor to be used, and aluminum, stainless steel, copper, nickel or the like is used, and aluminum is particularly preferable. The method for forming the electrode layer on the current collector may be a conventional method, in which a member used for the electrode layer is dispersed in a solvent to form a slurry, which is applied to a current collector that has been subjected to surface etching treatment to reduce resistance. That's fine. Generally, a metal mask printing method, an electrostatic coating method, a dip coating method, a spray coating method, a roll coating method, a doctor blade method, a gravure coating method, a screen printing method and the like are used as the coating method. Thereafter, rolling may be performed by a flat plate press, a calender roll, or the like, if necessary. In addition to the coating method, a sheet-like electrode may be formed by an extrusion method, and then integrated with the current collector using a conductive adhesive.

電解液としては、電気化学的に安定な電解質を極性有機溶媒に溶解させたものを適宜使用すればよい。電解質としては、（Ｃ2Ｈ5）4Ｎ+や（Ｃ4Ｈ9）4Ｎ+、（Ｃ2Ｈ5）4Ｐ+などの第４級オニウムカチオンと、ＢＦ4 -やＰＦ6 -、ＣｌＯ4 -などのアニオンとからなる塩が好ましい。有機溶媒としては、プロピレンカーボネート、ブチレンカーボネート、ジエチルカーボネートなどのカーボネート類、γ−ブチロラクトンなどのラクトン類やスルホランなどが好ましい。これらの有機溶媒は、単独でなく、２種以上併用してもよい。 What is necessary is just to use suitably what melt | dissolved the electrochemically stable electrolyte in the polar organic solvent as electrolyte solution. Examples of the electrolyte include quaternary onium cations such as (C 2 H 5 ) 4 N + , (C 4 H 9 ) 4 N + , (C 2 H 5 ) 4 P + , BF 4 − and PF 6 − , ClO 4 - anions comprising a salt such as preferred. As the organic solvent, carbonates such as propylene carbonate, butylene carbonate and diethyl carbonate, lactones such as γ-butyrolactone, sulfolane and the like are preferable. These organic solvents may be used alone or in combination of two or more.

熱可塑性絶縁性フィルムには、ポリエチレンやポリプロピレン、酸変性プロピレン、エチレン−メタクリル酸共重合体などに代表される熱可塑性樹脂を用いればよい。   For the thermoplastic insulating film, a thermoplastic resin typified by polyethylene, polypropylene, acid-modified propylene, ethylene-methacrylic acid copolymer or the like may be used.

ラミネートフィルムには、金属箔とポリオレフィン系フィルムを貼り合わせたラミネートフィルムを用いればよい。   As the laminate film, a laminate film in which a metal foil and a polyolefin film are bonded together may be used.

次に、本実施の形態の電気二重層キャパシタの構造について詳しく説明する。   Next, the structure of the electric double layer capacitor of the present embodiment will be described in detail.

まず、キャパシタ素子は、正極および負極からなる一対の分極性電極１１がセパレータ１２を介して対向配置され、上記分極性電極１１の両側面にはそれぞれ集電体１３が貼り付けられ、その集電体１３の一端にはそれぞれリード端子１５が接続されることにより構成される。   First, in the capacitor element, a pair of polarizable electrodes 11 composed of a positive electrode and a negative electrode are arranged to face each other via a separator 12, and current collectors 13 are attached to both side surfaces of the polarizable electrode 11, respectively. A lead terminal 15 is connected to one end of the body 13.

次に、キャパシタ素子と熱可塑性絶縁性フィルム１８が交互に積層されるが、図１のように、キャパシタ素子が２個の例の場合は、熱可塑性絶縁性フィルム１８をキャパシタ素子で挟むように積層する。さらに、キャパシタ素子に接続されたリード端子１５の一部が突出するように、電解液１４が含浸されたキャパシタ素子と熱可塑性絶縁性フィルム１８をラミネートフィルム１６等の外装体にて封止する。また、同方向に一部突出した２つのリード端子１５を抵抗溶接や超音波溶接等により電気的に接続する。   Next, the capacitor elements and the thermoplastic insulating films 18 are alternately laminated. In the case of two capacitor elements as shown in FIG. 1, the thermoplastic insulating film 18 is sandwiched between the capacitor elements. Laminate. Further, the capacitor element impregnated with the electrolytic solution 14 and the thermoplastic insulating film 18 are sealed with an exterior body such as a laminate film 16 so that a part of the lead terminal 15 connected to the capacitor element protrudes. Further, the two lead terminals 15 partially protruding in the same direction are electrically connected by resistance welding, ultrasonic welding or the like.

これにより、ラミネートフィルム１６等の外装体の内部が熱可塑性絶縁性フィルム１８で仕切られ、仕切られた内部にリード端子の接続されたキャパシタ素子が配置され、突出したリード端子が電気的に接続されてキャパシタ素子が複数個直列に接続された電気二重層キャパシタが構成される。   Thereby, the inside of the exterior body such as the laminate film 16 is partitioned by the thermoplastic insulating film 18, the capacitor element to which the lead terminal is connected is arranged inside the partitioned body, and the protruding lead terminal is electrically connected. Thus, an electric double layer capacitor in which a plurality of capacitor elements are connected in series is configured.

本実施の形態の電気二重層キャパシタの製造方法についてここで少し述べる。   Here, a method for manufacturing the electric double layer capacitor of the present embodiment will be described a little.

活性炭とカーボンブラック、ポリフッ化ビニリデン等を溶媒に分散させてスラリとし、そのスラリを集電体１３となるアルミニウム箔等に塗布して、分極性電極１１となる分極性電極層を作製する。集電体１３と塗工した分極性電極１１を所定の大きさに加工する。正極と負極とする各分極性電極１１にセパレータ１２を挟みキャパシタ素子を作製する。キャパシタ素子の各集電体１３にはリード端子１５を接続する。集電体１３のアルミニウム箔の延長をリード端子１５としてもよい。外装材である２枚のラミネートフィルム１６の間に熱可塑性樹脂やポリプロピレン樹脂または酸性プロピレン樹脂を用いた熱可塑性絶縁性フィルム１８を挟み、方形の電気二重層キャパシタの場合、隣り合わない対向する２つの端の融着を行う。   Activated carbon, carbon black, polyvinylidene fluoride, and the like are dispersed in a solvent to form a slurry, and the slurry is applied to an aluminum foil or the like serving as the current collector 13 to produce a polarizable electrode layer that serves as the polarizable electrode 11. The current collector 13 and the coated polarizable electrode 11 are processed into a predetermined size. Capacitor elements are fabricated by sandwiching separators 12 between polarizable electrodes 11 serving as positive and negative electrodes. A lead terminal 15 is connected to each current collector 13 of the capacitor element. An extension of the aluminum foil of the current collector 13 may be used as the lead terminal 15. A thermoplastic insulating film 18 using a thermoplastic resin, polypropylene resin or acidic propylene resin is sandwiched between two laminate films 16 which are exterior materials. Fusing one end.

このラミネートフィルム１６と熱可塑性絶縁性フィルム１８の間の２カ所（２つのセル）に上記キャパシタ素子を挿入し、ラミネートフィルムの残り二端の一端を、各キャパシタ素子に接続されたリード端子の一部が外部に突出するように熱シールを行う。電解液１４を注入した後、ラミネートフィルム１６の最後の残り一端を、各キャパシタ素子に接続された他方のリード端子１５の一部が外部に突出するように熱シールを行う。また、ラミネートフィルム１６の外部へ同方向に突出した２つのリード端子１５の溶接箇所１７に溶接を行う。この溶接によりキャパシタ素子間の電気的な接続がなされ、図１に示すような２個のキャパシタ素子が直列に接続された電気二重層キャパシタが得られる。   The capacitor element is inserted into two places (two cells) between the laminate film 16 and the thermoplastic insulating film 18, and the other two ends of the laminate film are connected to one of the lead terminals connected to each capacitor element. Heat seal is performed so that the part protrudes to the outside. After injecting the electrolyte solution 14, the last remaining one end of the laminate film 16 is heat sealed so that a part of the other lead terminal 15 connected to each capacitor element protrudes to the outside. Further, welding is performed on the welded portions 17 of the two lead terminals 15 protruding in the same direction to the outside of the laminate film 16. By this welding, electrical connection is made between the capacitor elements, and an electric double layer capacitor in which two capacitor elements are connected in series as shown in FIG. 1 is obtained.

以上、添付図面を参照しながら、本発明に係る電気二重層キャパシタの好適な実施の形態について説明したが、本発明は、係る例にのみ限定されるものではなく、例えば、３個、４個と、複数のキャパシタ素子が直列に接続されたものであっても、方形以外の多角形状、楕円形状等の電気二重層キャパシタであってもよい。   The preferred embodiments of the electric double layer capacitor according to the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to such an example, and for example, three or four. In addition, a plurality of capacitor elements may be connected in series, or may be an electric double layer capacitor having a polygonal shape other than a rectangular shape, an elliptical shape, or the like.

以下に、実施例を挙げて、本発明の説明をする。   Hereinafter, the present invention will be described with reference to examples.

比表面積１５００ｍ2／ｇのやしがら系活性炭とカーボンブラックとポリフッ化ビニリデンを重量比８：１：１で混合したものに溶媒を加えスラリを作製した。このスラリを表面エッチング処理した３０μｍ厚のアルミニウム箔の片面にドクターブレード法にて塗布し分極性電極を作製した。分極性電極の分極性電極層はアルミニウム集電体の片面に厚みが２０μｍ厚になるように塗工した。その後、電極形状に合った寸法にスリット加工した。次に、正極と負極の各電極で２５μｍ厚のレーヨン系セパレータを挟みキャパシタ素子を作製した。また、製品サイズに切った長方形のナイロンとアルミニウム箔およびポリプロピレンの三層構造からなる１１５μｍ厚のラミネートフィルムを２枚用意し、この２枚のフィルムの間に１００μｍ厚の酸変性ポリプロピレンシートを挟み、隣り合わない対向する２つの端を熱シール機で２１０℃、１秒間の融着を行った。 A slurry was prepared by adding a solvent to a mixture of coconut shell activated carbon having a specific surface area of 1500 m 2 / g, carbon black, and polyvinylidene fluoride in a weight ratio of 8: 1: 1. This slurry was applied to one side of a 30 μm thick aluminum foil subjected to surface etching treatment by a doctor blade method to produce a polarizable electrode. The polarizable electrode layer of the polarizable electrode was coated on one side of the aluminum current collector so as to have a thickness of 20 μm. Thereafter, slitting was performed to a size suitable for the electrode shape. Next, a capacitor element was fabricated by sandwiching a 25 μm thick rayon separator between the positive electrode and the negative electrode. In addition, two 115 μm-thick laminate films consisting of a three-layer structure of rectangular nylon, aluminum foil and polypropylene cut into product sizes are prepared, and an acid-modified polypropylene sheet of 100 μm thickness is sandwiched between the two films, Two opposite ends that are not adjacent to each other were fused at 210 ° C. for 1 second using a heat sealing machine.

このラミネートフィルムと酸変性ポリプロピレンシート間の２つのセルに上記キャパシタ素子を挿入し、ラミネートフィルムの残り二端の一端を、各キャパシタ素子に接続されたリード端子の一部が外部に突出するように熱シールした。その後、２つの各セルにテトラメチルアンモニウムテトラフルオロボーレートをプロピレンカーボネートに溶解した電解液を注入した後、ラミネートフィルムの最後の残り一端を、各キャパシタ素子に接続された他方のリード端子の一部が外部に突出するように熱シールした。最後に、ラミネートフィルム外部へ同方向に突出した２つのリード端子の超音波溶接を行って本実施例の電気二重層キャパシタとした。本実施例の電気二重層キャパシタの厚みは０．５８ｍｍであった。   The capacitor element is inserted into two cells between the laminate film and the acid-modified polypropylene sheet, and one end of the remaining two ends of the laminate film is so that a part of the lead terminal connected to each capacitor element protrudes to the outside. Heat sealed. Then, after injecting an electrolyte solution in which tetramethylammonium tetrafluoroborate was dissolved in propylene carbonate into each of the two cells, the last remaining end of the laminate film was connected to a part of the other lead terminal connected to each capacitor element. It heat-sealed so that it might protrude outside. Finally, ultrasonic welding of the two lead terminals protruding in the same direction to the outside of the laminate film was performed to obtain the electric double layer capacitor of this example. The thickness of the electric double layer capacitor of this example was 0.58 mm.

比較例として、図２の従来例と同様に、正極と負極からなる一対の分極性電極を、セパレータを介して対向配置し、この分極性電極に電解液を注入し、リード端子のみ外部に突出するようにラミネートフィルムで封止することで電気二重層キャパシタを作成した。作成した２個の電気二重層キャパシタを厚み方向に重なるように３０μｍ厚の接着剤３８にて固定し、さらに同方向に一部突出した２つのリード端子の超音波溶接を行って比較例の電気二重層キャパシタとした。比較例の電気二重層キャパシタの厚みは０．７４ｍｍであった。従って、本発明の場合には、比較例に比べて０．１６ｍｍ薄くすることができた。これは全体の約２０％にあたり、薄型化が求められている本分野においては非常に大きい成果である。以上のように、ラミネートフィルム等の外装体の内部の熱可塑性フィルムで仕切られた各セルにキャパシタ素子を配置することで、電気二重層キャパシタ全体の厚みを従来と比べて薄型化することができる。   As a comparative example, like the conventional example of FIG. 2, a pair of polarizable electrodes consisting of a positive electrode and a negative electrode are arranged opposite to each other via a separator, an electrolyte is injected into this polarizable electrode, and only the lead terminal protrudes outside. Thus, an electric double layer capacitor was created by sealing with a laminate film. The two electric double layer capacitors thus prepared were fixed with an adhesive 38 having a thickness of 30 μm so as to overlap in the thickness direction, and two lead terminals partially protruding in the same direction were further ultrasonically welded to produce a comparative example. A double layer capacitor was obtained. The thickness of the electric double layer capacitor of the comparative example was 0.74 mm. Therefore, in the case of the present invention, the thickness was 0.16 mm thinner than that of the comparative example. This is about 20% of the total, and is a great achievement in this field where thinning is required. As described above, by disposing the capacitor element in each cell partitioned by the thermoplastic film inside the exterior body such as a laminate film, the thickness of the entire electric double layer capacitor can be reduced as compared with the conventional case. .

本実施の形態に係る電気二重層キャパシタの断面図。Sectional drawing of the electric double layer capacitor which concerns on this Embodiment. 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. 従来の電気二重層キャパシタを直列に接続した場合の断面図。Sectional drawing at the time of connecting the conventional electric double layer capacitor in series.

符号の説明Explanation of symbols

１１，２１，３１ 分極性電極
１２，２２，３２ セパレータ
１３，２３，３３ 集電体
１４，２４，３４ 電解液
１５，２５，３５ リード端子
１６，２６，３６ ラミネートフィルム
１７，３７ 溶接箇所
１８ 熱可塑性絶縁性フィルム
３８ 接着剤 11, 21, 31 Separation electrodes 12, 22, 32 Separators 13, 23, 33 Current collectors 14, 24, 34 Electrolytic solutions 15, 25, 35 Lead terminals 16, 26, 36 Laminate films 17, 37 Welding points 18 Heat Plastic insulating film 38 Adhesive

Claims (3)

正極および負極からなる一対の分極性電極がセパレータを介して対向配置されたキャパシタ素子を外装体にて封止した電気二重層キャパシタであって、
前記外装体と絶縁性フィルムを有し、
前記外装体の内部は前記絶縁性フィルムで仕切られ、
仕切られた内部にリード端子の接続された前記キャパシタ素子が配置され、
前記リード端子の一部が突出して外装体にて封止され、
突出した前記リード端子が接続されることで前記キャパシタ素子が複数個直列に接続され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 a capacitor element in which a pair of polarizable electrodes composed of a positive electrode and a negative electrode are arranged to face each other via a separator is sealed with an exterior body,
Having the outer package and an insulating film;
The interior of the exterior body is partitioned by the insulating film,
The capacitor element connected to the lead terminal is arranged in the partitioned interior,
A part of the lead terminal protrudes and is sealed with an exterior body,
An electric double layer capacitor, wherein a plurality of the capacitor elements are connected in series by connecting the protruding lead terminals. 前記絶縁性フィルムが熱可塑性樹脂である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 insulating film is a thermoplastic resin. 前記絶縁性フィルムがポリプロピレン樹脂または酸変性ポリプロピレン樹脂である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 insulating film is a polypropylene resin or an acid-modified polypropylene resin.
JP2007292003A 2007-11-09 2007-11-09 Electric double-layer capacitor Pending JP2009117759A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013042612A1 (en) * 2011-09-21 2013-03-28 Ｎｅｃエナジーデバイス株式会社 Film sheath battery and assembled battery
JP2015207558A (en) * 2014-04-17 2015-11-19 乾坤科技股▲ふん▼有限公司 Battery device with high energy density and power density

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Publication number Priority date Publication date Assignee Title
JPH0676804A (en) * 1992-08-27 1994-03-18 Shin Kobe Electric Mach Co Ltd Thin type sealed storage battery
JP2005045181A (en) * 2003-07-25 2005-02-17 Tdk Corp Electrochemical element
JP2007165185A (en) * 2005-12-15 2007-06-28 Nissan Motor Co Ltd Secondary battery module

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0676804A (en) * 1992-08-27 1994-03-18 Shin Kobe Electric Mach Co Ltd Thin type sealed storage battery
JP2005045181A (en) * 2003-07-25 2005-02-17 Tdk Corp Electrochemical element
JP2007165185A (en) * 2005-12-15 2007-06-28 Nissan Motor Co Ltd Secondary battery module

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013042612A1 (en) * 2011-09-21 2013-03-28 Ｎｅｃエナジーデバイス株式会社 Film sheath battery and assembled battery
JP2015207558A (en) * 2014-04-17 2015-11-19 乾坤科技股▲ふん▼有限公司 Battery device with high energy density and power density

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