JP5116102B2 - Electric double layer capacitor - Google Patents

Electric double layer capacitor Download PDF

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JP5116102B2
JP5116102B2 JP2008166671A JP2008166671A JP5116102B2 JP 5116102 B2 JP5116102 B2 JP 5116102B2 JP 2008166671 A JP2008166671 A JP 2008166671A JP 2008166671 A JP2008166671 A JP 2008166671A JP 5116102 B2 JP5116102 B2 JP 5116102B2
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double layer
electric double
layer capacitor
ring
capacitor element
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JP2010010312A (en
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恵一 小川
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Tokin Corp
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Description

本発明は、電気二重層コンデンサに関し、電気二重層コンデンサ素子の構造に関するものである。   The present invention relates to an electric double layer capacitor and relates to the structure of an electric double layer capacitor element.

従来の電気二重層コンデンサの構造について図を用いて説明する。図４は従来の電気二重層コンデンサの説明図である。図４（ａ）は、従来の電気二重層コンデンサの第１の例の説明図であり、図４（ｂ）は、従来の電気二重層コンデンサの第２の例の説明図である。この従来の２つの電気二重層コンデンサの基本的な構造は同じであるが、外装金属ケースが異なる。図４（ａ）に示した従来の電気二重層コンデンサの第１の例は上面が平らな外装金属ケース１３が用いられ、図４（ｂ）に示した従来の電気二重層コンデンサの第２の例は上面に凸部を有する凸部付き外装金属ケース２３が用いられている。   A structure of a conventional electric double layer capacitor will be described with reference to the drawings. FIG. 4 is an explanatory diagram of a conventional electric double layer capacitor. FIG. 4A is an explanatory diagram of a first example of a conventional electric double layer capacitor, and FIG. 4B is an explanatory diagram of a second example of the conventional electric double layer capacitor. The basic structure of these two conventional electric double layer capacitors is the same, but the exterior metal case is different. The first example of the conventional electric double layer capacitor shown in FIG. 4A uses an exterior metal case 13 having a flat upper surface, and the second example of the conventional electric double layer capacitor shown in FIG. In the example, an exterior metal case 23 having a convex portion having a convex portion on the upper surface is used.

図４（ａ）に示した従来の電気二重層コンデンサの第１の例を用いて従来の電気二重層コンデンサの構成について説明する。従来の電気二重層コンデンサの第１の例は、電気二重層コンデンサ素子１９、外装金属ケース１３、絶縁ケース４、座板５、第１の電極板１６、第２の電極板２６、第１のリード端子１７、第２のリード端子２７から構成されている。電気二重層コンデンサ素子１９は模式図で表され、その他の部品は断面図で表されている。   The configuration of the conventional electric double layer capacitor will be described using the first example of the conventional electric double layer capacitor shown in FIG. A first example of a conventional electric double layer capacitor includes an electric double layer capacitor element 19, an exterior metal case 13, an insulating case 4, a seat plate 5, a first electrode plate 16, a second electrode plate 26, The lead terminal 17 and the second lead terminal 27 are included. The electric double layer capacitor element 19 is represented by a schematic diagram, and the other components are represented by sectional views.

絶縁ケース４は、絶縁材料としてポリアセタール、ポリフェニレンサルファイド（ＰＰＳ）、液晶ポリマー（ＬＣＰ）などのエンジニアリングプラスチックからなり、電気二重層コンデンサ素子１９を収容する容器である。外装金属ケース１３は、絶縁ケース４に収容された電気二重層コンデンサ素子１９を収容する容器である。外装金属ケース１３は、プリント配線基板に実装した際、他の電子部品とのショートを防ぐために外側は絶縁スリーブに覆われている。座板５は、絶縁材料からなり、電気二重層コンデンサ素子１９と接続された第１のリード端子１７、第２のリード端子２７が挿通され、プリント配線基板に実装する際の実装安定性を確保している。   The insulating case 4 is made of engineering plastics such as polyacetal, polyphenylene sulfide (PPS), and liquid crystal polymer (LCP) as an insulating material, and is a container that houses the electric double layer capacitor element 19. The exterior metal case 13 is a container that accommodates the electric double layer capacitor element 19 accommodated in the insulating case 4. The exterior metal case 13 is covered with an insulating sleeve in order to prevent short circuit with other electronic components when mounted on a printed wiring board. The seat plate 5 is made of an insulating material, and the first lead terminal 17 and the second lead terminal 27 connected to the electric double layer capacitor element 19 are inserted therethrough to ensure mounting stability when mounted on the printed wiring board. is doing.

電気二重層コンデンサ素子１９の下面には第１の電極板１６が接続されて絶縁ケース４に収容されている。第１の電極板１６から延びた第１のリード端子１７は、絶縁ケース４の底面を挿通するとともに、絶縁ケース４の裏面に配置された座板５も挿通して座板５の下面に平行に沿って延びている。   A first electrode plate 16 is connected to the lower surface of the electric double layer capacitor element 19 and accommodated in the insulating case 4. The first lead terminal 17 extending from the first electrode plate 16 is inserted through the bottom surface of the insulating case 4, and the seat plate 5 disposed on the back surface of the insulating case 4 is also inserted and parallel to the lower surface of the seat plate 5. It extends along.

絶縁ケース４に収容された電気二重層コンデンサ素子１９の高さ寸法は、絶縁ケース４の深さ寸法よりも長くなっている。底面を有する筒状の外装金属ケース１３を底面を上にして、絶縁ケース４に収容された電気二重層コンデンサ素子１９に被せて、外装金属ケース１３の開口部を絶縁ケース４の底面部に配置する。   The height dimension of the electric double layer capacitor element 19 accommodated in the insulating case 4 is longer than the depth dimension of the insulating case 4. A cylindrical outer metal case 13 having a bottom surface is placed on the electric double layer capacitor element 19 accommodated in the insulating case 4 with the bottom surface facing upward, and the opening of the outer metal case 13 is disposed on the bottom surface portion of the insulating case 4 To do.

この構造とすることで外装金属ケース１３の底面は、電気二重層コンデンサ素子１９の上面と接続されて、外装金属ケース１３の開口部は、絶縁ケース４の裏面に設置された第２の電極板２６と接続することにより、第２の電極板２６は外装金属ケース１３を介して電気二重層コンデンサ素子１９の上面と接続される。第２の電極板２６から延びた第２のリード端子２７は、絶縁ケース４の底面に配置された座板５を貫通して座板５の下面に平行に沿って第１のリード端子１７とは反対方向へ延びている。   With this structure, the bottom surface of the outer metal case 13 is connected to the upper surface of the electric double layer capacitor element 19, and the opening of the outer metal case 13 is the second electrode plate installed on the back surface of the insulating case 4. By connecting to the second electrode plate 26, the second electrode plate 26 is connected to the upper surface of the electric double layer capacitor element 19 through the outer metal case 13. The second lead terminal 27 extending from the second electrode plate 26 penetrates through the seat plate 5 disposed on the bottom surface of the insulating case 4 and extends in parallel with the first lead terminal 17 along the lower surface of the seat plate 5. Extends in the opposite direction.

ここで第１の電極板１６と第２の電極板２６は絶縁ケース４を介して絶縁され、第１のリード端子１７と第２のリード端子２７も絶縁されて配置されている。このような構造とすることにより、外部から第１のリード端子１７と第２のリード端子２７との間に電圧を印加すると、その電圧は電気二重層コンデンサ素子１９の上面と下面に印加されることになる。   Here, the first electrode plate 16 and the second electrode plate 26 are insulated via the insulating case 4, and the first lead terminal 17 and the second lead terminal 27 are also insulated. With such a structure, when a voltage is applied between the first lead terminal 17 and the second lead terminal 27 from the outside, the voltage is applied to the upper surface and the lower surface of the electric double layer capacitor element 19. It will be.

次に、図４（ａ）にて模式図で表していた電気二重層コンデンサ素子１９の構成について図を参照して詳細に説明する。電気二重層コンデンサ素子１９は、電気二重層コンデンサの基本セル１が積層されて構成されている。   Next, the configuration of the electric double layer capacitor element 19 shown schematically in FIG. 4A will be described in detail with reference to the drawings. The electric double layer capacitor element 19 is configured by laminating basic cells 1 of an electric double layer capacitor.

図５は、従来の電気二重層コンデンサの基本セルの断面図である。基本セル１は、活性炭を用いた分極性電極３１が、セパレータ４１を介して配置されている。セパレータ４１は、分極性電極３１間のショートを防止し、電解液中のイオンを透過する機能を持っている。分極性電極３１がセパレータ４１と接する面の反対側には、導電性ゴムからなる集電体１１が配置されている。また、分極性電極３１の外周部にはリング状の絶縁性ゴム２１が配置されている。リング状の絶縁性ゴム２１は、電解液を封止し絶縁する機能を持っている。   FIG. 5 is a cross-sectional view of a basic cell of a conventional electric double layer capacitor. In the basic cell 1, a polarizable electrode 31 using activated carbon is disposed via a separator 41. The separator 41 has a function of preventing a short circuit between the polarizable electrodes 31 and transmitting ions in the electrolytic solution. On the opposite side of the surface where the polarizable electrode 31 is in contact with the separator 41, the current collector 11 made of conductive rubber is disposed. A ring-shaped insulating rubber 21 is disposed on the outer periphery of the polarizable electrode 31. The ring-shaped insulating rubber 21 has a function of sealing and insulating the electrolytic solution.

基本セル１の耐電圧は、電解液の電気分解電圧で決まり、水溶液系の場合は、１．０Ｖ程度、有機系の場合は、２．５Ｖ程度である。このため電気二重層コンデンサ素子は、基本セル１を使用する電圧に応じて、必要枚数を積層して直列接続することにより構成されている。   The withstand voltage of the basic cell 1 is determined by the electrolysis voltage of the electrolytic solution, and is about 1.0 V for an aqueous solution system and about 2.5 V for an organic system. For this reason, the electric double layer capacitor element is configured by stacking the required number of layers and connecting them in series according to the voltage at which the basic cell 1 is used.

図６は、従来の電気二重層コンデンサ素子の断面図である。図６（ａ）は、従来の電気二重層コンデンサの基本セル積層体の断面図であり、図６（ｂ）は上下から加圧された状態の断面図である。   FIG. 6 is a cross-sectional view of a conventional electric double layer capacitor element. FIG. 6A is a cross-sectional view of a basic cell multilayer body of a conventional electric double layer capacitor, and FIG. 6B is a cross-sectional view in a state where pressure is applied from above and below.

図６（ａ）において、電気二重層コンデンサの基本セル積層体９は、基本セル１を６層積層した例を示している。基本セル積層体９には、基本セル１内部の活性炭粒子間の接触抵抗や、基本セル１相互間の接触抵抗などにより内部抵抗が存在する。   In FIG. 6A, an electric double layer capacitor basic cell laminate 9 shows an example in which six layers of basic cells 1 are laminated. The basic cell laminate 9 has internal resistance due to contact resistance between activated carbon particles inside the basic cell 1 or contact resistance between the basic cells 1.

内部抵抗の大きさは、基本セル積層体９の上下から圧力を加えることにより低減させる事ができる。加えられる圧力が大きいと内部抵抗は小さくなるという特性を持つので、電気二重層コンデンサ全体としての内部抵抗を小さく抑え維持するためには、基本セル積層体９の上下から圧力を加え、且つその圧力を半永久的に持続できる構造とすることが必要となる。この圧力の大きさは、内部抵抗の大きさや耐圧力性などを考慮して決めるが、通常は数１０ｋｇ／ｃｍ2程度である。このように電気二重層コンデンサ素子１９は、基本セル積層体９の上下から圧力が加えられているので図６（ｂ）に示したように側面が膨らんだ形状となっている。 The magnitude of the internal resistance can be reduced by applying pressure from above and below the basic cell stack 9. Since the internal resistance becomes small when the applied pressure is large, in order to keep the internal resistance of the electric double layer capacitor as small as possible, the pressure is applied from above and below the basic cell laminate 9, and the pressure It is necessary to make the structure semi-permanently sustainable. The magnitude of this pressure is determined in consideration of the magnitude of internal resistance, pressure resistance, etc., but is usually about several tens of kg / cm 2 . Thus, the electric double layer capacitor element 19 has a shape in which the side surface swells as shown in FIG. 6B because pressure is applied from above and below the basic cell laminate 9.

ところで、電気二重層コンデンサのプリント配線基板への実装は、一般に半田リフローにて行われている。使用する半田の種類にもよるが半田リフロー時には、電気二重層コンデンサは、２４０℃以上の高温環境下にさらされてしまう。このような高温環境下では、基本セル１の内部圧力が上昇してしまう。基本セル１は、図５で示した様に分極性電極３１中の電解液を導電性ゴムからなる集電体１１と封止用の絶縁性ゴム２1で密封する構造となっている。絶縁性ゴム２１は、集電体１１の導電性ゴムと比べて弾力性を持っているので、均等に変形しないため集電体１１と絶縁性ゴム２1の接着界面が、内部圧力の上昇に耐えられないと剥がれ、基本セル１内部の電解液が漏れることになる。   Incidentally, mounting of an electric double layer capacitor on a printed wiring board is generally performed by solder reflow. Although depending on the type of solder used, the electric double layer capacitor is exposed to a high temperature environment of 240 ° C. or more during solder reflow. Under such a high temperature environment, the internal pressure of the basic cell 1 increases. As shown in FIG. 5, the basic cell 1 has a structure in which the electrolyte in the polarizable electrode 31 is sealed with a current collector 11 made of conductive rubber and an insulating rubber 21 for sealing. Since the insulating rubber 21 is more elastic than the conductive rubber of the current collector 11, the insulating rubber 21 does not deform evenly, so that the bonding interface between the current collector 11 and the insulating rubber 21 can withstand the rise in internal pressure. Otherwise, it will peel off and the electrolyte in the basic cell 1 will leak.

上記の問題の対策を施した電気二重層コンデンサが特許文献１に開示されている。その構造が図４（ｂ）に示した従来の電気二重層コンデンサの第２の例である。前述した図４（ａ）に示した従来の電気二重層コンデンサの第１の例と基本的な構成は同じであるが、外装金属ケースが異なり、凸部付き外装金属ケース２３が用いられている。   An electric double layer capacitor in which measures for the above problems are taken is disclosed in Patent Document 1. The structure is a second example of the conventional electric double layer capacitor shown in FIG. Although the basic configuration is the same as that of the first example of the conventional electric double layer capacitor shown in FIG. 4A described above, the exterior metal case is different, and the exterior metal case 23 with projections is used. .

凸部付き外装金属ケース２３は、対向する電気二重層コンデンサ素子１９上面の中央部が外側に膨出した凸部を有している。図５に示した基本セル１と対応させると、分極性電極３１に対向する部分が外側に膨出した凸部となり、集電体１１と絶縁性ゴム２1の接着界面は平面となっている。この様に成形された外装金属ケースに収容される事により集電体１１と絶縁性ゴム２1の接着界面は平面で固定され圧力が保持された状態で電気二重層コンデンサ素子１９は保持されている事になる。従って、半田リフロー時の高温環境下で、電気二重層コンデンサの基本セル１の内部圧力が上昇しても、集電体１１と絶縁性ゴム２1の接着界面が、内部圧力の上昇に耐えられず剥がれることを防止する事ができる。   The outer metal case 23 with a convex portion has a convex portion in which the central portion of the upper surface of the opposing electric double layer capacitor element 19 bulges outward. Corresponding to the basic cell 1 shown in FIG. 5, the portion facing the polarizable electrode 31 becomes a convex portion bulging outward, and the bonding interface between the current collector 11 and the insulating rubber 21 is flat. The electric double layer capacitor element 19 is held in a state where the adhesion interface between the current collector 11 and the insulating rubber 21 is fixed on a plane and the pressure is held by being accommodated in the outer metal case formed in this way. It will be a thing. Therefore, even if the internal pressure of the basic cell 1 of the electric double layer capacitor rises in a high temperature environment during solder reflow, the bonding interface between the current collector 11 and the insulating rubber 21 cannot withstand the rise in internal pressure. It can prevent peeling.

実開平４−４６５３５号公報Japanese Utility Model Publication No. 4-46535

一般に電子部品をプリント配線基板に表面実装する場合には、自動実装機で電子部品の上面を吸着して、プリント配線基板へ搬送し所定の位置へ実装する。この時、電子部品の上面に凹凸があると、電子部品を確実に吸着する事ができなくなり、所定の位置へ電子部品が搬送されずに自動実装ができなくなるという問題があった。   In general, when surface mounting an electronic component on a printed wiring board, the upper surface of the electronic component is sucked by an automatic mounting machine, transported to the printed wiring board, and mounted at a predetermined position. At this time, if the top surface of the electronic component is uneven, there is a problem in that the electronic component cannot be reliably attracted, and the electronic component cannot be automatically mounted without being transported to a predetermined position.

従来の電気二重層コンデンサの第２の例では、凸部付き外装金属ケースを用いる事により、半田リフロー時の高温環境下で、電気二重層コンデンサの内部圧力の上昇による集電体と絶縁性ゴムの接着界面が剥がれるという不具合の対策はできたが、プリント配線基板への自動実装に対応できないという問題があった。   In a second example of a conventional electric double layer capacitor, a current collector and an insulating rubber due to an increase in internal pressure of the electric double layer capacitor are used in a high temperature environment during solder reflow by using an outer metal case with a convex portion. Although it was possible to take measures against the problem of peeling off the adhesive interface, there was a problem that automatic mounting on a printed wiring board could not be supported.

従って本発明は、半田リフロー時の高温環境下で基本セルの内部圧力の上昇により集電体と絶縁性ゴムの接着界面が剥がれることへの対策が施された耐熱性が高く、かつプリント配線基板への自動実装に対応可能な電気二重層コンデンサを提供することである。   Therefore, the present invention has a high heat resistance in which a countermeasure is taken against peeling of the adhesive interface between the current collector and the insulating rubber due to an increase in the internal pressure of the basic cell in a high temperature environment during solder reflow, and the printed wiring board. It is to provide an electric double layer capacitor that can be automatically mounted on a capacitor.

本発明は、電解液を含んだ炭素材料からなる分極性電極と、導電性ゴムからなる集電体の対がセパレータを介して対向して配置され、外周部を絶縁性ゴムで封止されてなる電気二重層コンデンサ基本セルを複数積層した積層体に上下から圧力を加えてなる電気二重層コンデンサ素子の加圧状態を保持して外装金属ケースに収容し、前記電気二重層コンデンサ素子の２つの極性に接続された電極板と前記電極板に接続された２つのリード端子を備えてなる電気二重層コンデンサであって、前記電気二重層コンデンサ素子は、複数の前記電気二重層コンデンサ基本セルの積層体間に、内周部に上面及び下面から厚みの中心に向けて中央部が突出したテーパーを有するリング状補強板を挿入し上下から圧力を加えてなることを特徴とする電気二重層コンデンサである。 In the present invention, a pair of a polarizable electrode made of a carbon material containing an electrolytic solution and a current collector made of conductive rubber are arranged to face each other with a separator interposed therebetween, and an outer peripheral portion is sealed with an insulating rubber. An electric double layer capacitor element formed by laminating a plurality of basic electric double layer capacitor basic cells is pressurized from above and below and held in an outer metal case, and the two electric double layer capacitor elements are An electric double layer capacitor comprising an electrode plate connected in polarity and two lead terminals connected to the electrode plate, wherein the electric double layer capacitor element is a laminate of a plurality of basic cells of the electric double layer capacitor between the body, the electric double characterized in that the central portion toward the center of the thickness is under pressure from the insert a ring-shaped reinforcing plate having a tapered protruding vertically from the upper surface and the lower surface to the inner peripheral portion layer It is a capacitor.

前記リング状補強板の外径寸法は、前記電気二重層コンデンサ素子の外径寸法と同等で、前記リング状補強板の内径寸法は、前記絶縁性ゴムの内径寸法と同等であることを特徴とする上記の電気二重層コンデンサである。   The outer diameter dimension of the ring-shaped reinforcing plate is equal to the outer diameter dimension of the electric double layer capacitor element, and the inner diameter dimension of the ring-shaped reinforcing plate is equal to the inner diameter dimension of the insulating rubber. The electric double layer capacitor described above.

前記リング状の補強板は、導電性ゴム、ステンレス、アルミニウム、鉄等の金属材料、セラミック材料、熱可塑性樹脂の１つからなることを特徴とする上記の電気二重層コンデンサである。   In the electric double layer capacitor, the ring-shaped reinforcing plate is made of one of a conductive rubber, a metal material such as stainless steel, aluminum, and iron, a ceramic material, and a thermoplastic resin.

本発明によれば、集電体と絶縁性ゴムの接着界面の圧縮圧力が増加し、電解液の封止力が向上しているので、リフロー半田付け時の高温環境下において、電気二重層コンデンサの基本セルの内部圧力が上昇しても、電解液の漏れが防止でき、耐熱性の高い電気二重層コンデンサを提供できる。   According to the present invention, since the compression pressure of the adhesive interface between the current collector and the insulating rubber is increased and the sealing power of the electrolyte is improved, the electric double layer capacitor can be used in a high temperature environment during reflow soldering. Even if the internal pressure of the basic cell rises, leakage of the electrolyte can be prevented and an electric double layer capacitor with high heat resistance can be provided.

さらに、電気二重層コンデンサの上面に凹凸を設ける必要がないので、上面を平面にすることができ、プリント配線基板に表面実装する場合に、上面に凹凸がないので、自動実装機の吸着性が安定していて、自動実装に好適な電気二重層コンデンサを提供できる。   Furthermore, since there is no need to provide unevenness on the upper surface of the electric double layer capacitor, the upper surface can be made flat, and when mounted on the surface of a printed wiring board, there is no unevenness on the upper surface. An electric double layer capacitor that is stable and suitable for automatic mounting can be provided.

以下、本発明の実施の形態について、図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の電気二重層コンデンサの説明図である。図１において、本発明の電気二重層コンデンサは、図４（ａ）に示した従来の電気二重層コンデンサと比較して、電気二重層コンデンサ素子１２が異なりリング状補強板８が含まれている。その他の構成部品は図４（ａ）に示した従来の電気二重層コンデンサと同様である。   FIG. 1 is an explanatory diagram of an electric double layer capacitor of the present invention. In FIG. 1, the electric double layer capacitor of the present invention differs from the conventional electric double layer capacitor shown in FIG. 4A in that the electric double layer capacitor element 12 is different and includes a ring-shaped reinforcing plate 8. . Other components are the same as those of the conventional electric double layer capacitor shown in FIG.

本発明の電気二重層コンデンサの構造は、図１に示すように電気二重層コンデンサ素子１２の下面には第１の電極板１６が接続されて絶縁ケース４に収容されている。第１の電極板１６から延びた第１のリード端子１７は、絶縁ケース４の底面を挿通するとともに、絶縁ケース４の底面に配置された座板５も挿通して座板５の下面に平行に沿って延びている。   As shown in FIG. 1, the structure of the electric double layer capacitor of the present invention is accommodated in an insulating case 4 with a first electrode plate 16 connected to the lower surface of the electric double layer capacitor element 12. The first lead terminal 17 extending from the first electrode plate 16 is inserted through the bottom surface of the insulating case 4, and the seat plate 5 disposed on the bottom surface of the insulating case 4 is also inserted and parallel to the lower surface of the seat plate 5. It extends along.

絶縁ケース４に収容された電気二重層コンデンサ素子１２の高さ寸法は、絶縁ケース４の深さ寸法よりも長くなっている。底面を有する筒状の外装金属ケース１３を底面を上にして、絶縁ケース４に収容された電気二重層コンデンサ素子１９に被せて、外装金属ケース１３の開口部を絶縁ケース４の底面部に配置する。 The height dimension of the electric double layer capacitor element 12 accommodated in the insulating case 4 is longer than the depth dimension of the insulating case 4. A cylindrical outer metal case 13 having a bottom surface is placed on the electric double layer capacitor element 19 accommodated in the insulating case 4 with the bottom surface facing upward, and the opening of the outer metal case 13 is disposed on the bottom surface portion of the insulating case 4 To do.

この構造とすることで外装金属ケース１３の底面は、電気二重層コンデンサ素子１２の上面と接続されて、外装金属ケース１３の開口部は、絶縁ケース４の裏面に設置された第２の電極板２６と接続することにより、第２の電極板２６は外装金属ケース１３を介して電気二重層コンデンサ素子１２の上面と接続される。第２の電極板２６から延びた第２のリード端子２７は、絶縁ケース４の底面に配置された座板５を貫通して座板５の下面に平行に沿って第１のリード端子１７とは反対方向へ延びている。   With this structure, the bottom surface of the outer metal case 13 is connected to the upper surface of the electric double layer capacitor element 12, and the opening of the outer metal case 13 is the second electrode plate installed on the back surface of the insulating case 4. By connecting to the second electrode plate 26, the second electrode plate 26 is connected to the upper surface of the electric double layer capacitor element 12 through the outer metal case 13. The second lead terminal 27 extending from the second electrode plate 26 penetrates through the seat plate 5 disposed on the bottom surface of the insulating case 4 and extends in parallel with the first lead terminal 17 along the lower surface of the seat plate 5. Extends in the opposite direction.

ここで第１の電極板１６と第２の電極板２６は絶縁ケース４を介して絶縁され、第１のリード端子１７と第２のリード端子２７も絶縁されて配置されている。このような構造とすることにより、外部から第１のリード端子１７と第２リード端子２７の間に電圧を印加すると、その電圧は電気二重層コンデンサ素子１２の上面と下面に印加されることになる。   Here, the first electrode plate 16 and the second electrode plate 26 are insulated via the insulating case 4, and the first lead terminal 17 and the second lead terminal 27 are also insulated. With this structure, when a voltage is applied between the first lead terminal 17 and the second lead terminal 27 from the outside, the voltage is applied to the upper surface and the lower surface of the electric double layer capacitor element 12. Become.

本発明の電気二重層コンデンサに用いられるリング状補強板について説明する。図２は、本発明のリング状補強板の説明図である。図２（ａ）は本発明のリング状補強板の平面図であり、図２（ｂ）は本発明のリング状補強板のＡ−Ａ面の断面図である。図２（ｂ）の断面図のようにリング状補強板８は、内周部には上面及び下面から厚みの中心に向けて中央部が突出したテーパーが設けられていることが好ましい。外径寸法は電気二重層コンデンサ素子の外径寸法と同等であり、内径寸法は絶縁性ゴムの内径寸法と同等であることが好ましい。   The ring-shaped reinforcing plate used for the electric double layer capacitor of the present invention will be described. FIG. 2 is an explanatory view of the ring-shaped reinforcing plate of the present invention. Fig.2 (a) is a top view of the ring-shaped reinforcement board of this invention, FIG.2 (b) is sectional drawing of the AA surface of the ring-shaped reinforcement board of this invention. As shown in the cross-sectional view of FIG. 2B, the ring-shaped reinforcing plate 8 is preferably provided with a taper with a central portion protruding from the upper surface and the lower surface toward the center of thickness on the inner peripheral portion. The outer diameter dimension is preferably the same as the outer diameter dimension of the electric double layer capacitor element, and the inner diameter dimension is preferably equal to the inner diameter dimension of the insulating rubber.

本発明の電気二重層コンデンサに用いられるリング状補強板は、導電性ゴムや、ステンレス、アルミニウム、鉄などの金属材料や、セラミック材料や、熱可塑性樹脂であることが好ましい。   The ring-shaped reinforcing plate used in the electric double layer capacitor of the present invention is preferably a conductive rubber, a metal material such as stainless steel, aluminum or iron, a ceramic material, or a thermoplastic resin.

本発明の電気二重層コンデンサ素子について、図を用いて詳細に説明する。図３は、本発明の電気二重層コンデンサ素子の断面図である。図３（ａ）は、本発明の電気二重層コンデンサの基本セル積層体の断面図であり、図３（ｂ）は上下から加圧された状態の断面図である。   The electric double layer capacitor element of the present invention will be described in detail with reference to the drawings. FIG. 3 is a cross-sectional view of the electric double layer capacitor element of the present invention. FIG. 3A is a cross-sectional view of a basic cell laminate of the electric double layer capacitor of the present invention, and FIG. 3B is a cross-sectional view in a state where the pressure is applied from above and below.

図３（ａ）に示すように、本発明の１例の電気二重層コンデンサ素子の基本セル積層体２は、基本セル１を３層積層した積層体の間にリング状補強板８を挿入した形態である。ここでは、基本セル１を３層積層した例で説明するが、基本セル１の積層数とリング状補強板８の挿入枚数は限定されない。図６（ａ）に示した従来の基本セル積層体９と比較してみると、上下に位置する基本セル１を３層積層した積層体の間にリング状補強板８の厚み分の隙間が生じている。ここで図５に示した基本セル１の構成より、基本セル１を３層積層した積層体の集電体１１の間に隙間１８が生じている。   As shown in FIG. 3A, in the basic cell laminate 2 of the electric double layer capacitor element of one example of the present invention, a ring-shaped reinforcing plate 8 is inserted between the laminates in which the basic cells 1 are laminated. It is a form. Here, an example in which three layers of basic cells 1 are stacked will be described, but the number of stacked basic cells 1 and the number of inserted ring-shaped reinforcing plates 8 are not limited. When compared with the conventional basic cell laminate 9 shown in FIG. 6A, there is a gap corresponding to the thickness of the ring-shaped reinforcing plate 8 between the laminates in which the three basic cells 1 positioned above and below are laminated. Has occurred. Here, due to the configuration of the basic cell 1 shown in FIG. 5, a gap 18 is generated between the current collectors 11 of the stacked body in which three layers of the basic cells 1 are stacked.

図３（ｂ）は、図３（ａ）に示した本発明の電気二重層コンデンサの基本セル積層体２の上下から圧力を加えた形態の断面図である。上下から圧力を加えられると、上下に位置する基本セル１を３層積層した積層体の集電体１１の隙間１８が無くなり密着している。絶縁性ゴム２１の部分は、リング状補強板８があるために変形は少なくなっている。図６（ｂ）に示した従来の電気二重層コンデンサ素子１９のように積層体の側面の中央部が膨らんだ円柱形状ではなく、上下の積層体の間のリング状補強板８の部分がすぼまった円柱形状となっている。リング状補強板８を用いることにより、半田リフロー時の加熱時の様に内部圧力が高くなった場合でも、従来のように圧力が中央に集中されることがなく、リング状補強板８の上下に分散されるので、電解液の漏れ等が防止されると考えられる。また、リング状補強板８を用いることにより、従来と比較して基本セル１の集電体１１と絶縁性ゴム２１の接着界面に高い圧力が加わり電解液の封止性が高まると考えられる。   FIG. 3B is a cross-sectional view of a form in which pressure is applied from above and below the basic cell laminate 2 of the electric double layer capacitor of the present invention shown in FIG. When pressure is applied from above and below, the gap 18 of the current collector 11 of the laminated body in which three layers of the basic cells 1 located above and below are laminated is in close contact. The portion of the insulating rubber 21 is less deformed because of the ring-shaped reinforcing plate 8. Unlike the conventional electric double layer capacitor element 19 shown in FIG. 6B, the central portion of the side surface of the multilayer body is not a cylindrical shape, but the ring-shaped reinforcing plate 8 between the upper and lower multilayer bodies is formed. It has a cylindrical shape. By using the ring-shaped reinforcing plate 8, even when the internal pressure increases as in the case of heating during solder reflow, the pressure is not concentrated in the center as in the conventional case, and the upper and lower sides of the ring-shaped reinforcing plate 8 are Therefore, it is considered that leakage of the electrolyte is prevented. In addition, by using the ring-shaped reinforcing plate 8, it is considered that a higher pressure is applied to the bonding interface between the current collector 11 of the basic cell 1 and the insulating rubber 21 and the sealing performance of the electrolytic solution is enhanced as compared with the conventional case.

図６（ａ）に示した従来の電気二重層コンデンサの基本セル積層体９では、リング状補強板８が無いので、平らな集電体１１に加えられた圧力は中央部分の分極性電極３１に集中してしまう。図３に示した様に弾力性のある絶縁性ゴム２１の部分にリング状補強板８を挿入して、上下に圧力を加える事により、絶縁性ゴム２１へも圧力が加わり全体的に基本セルが密着して集電体１１間が接合されるので、リング状補強板８の材質は、セラミックや、熱可塑性樹脂のように絶縁材料を用いた場合にも電気的な接続に問題はない。   In the basic cell laminate 9 of the conventional electric double layer capacitor shown in FIG. 6 (a), since there is no ring-shaped reinforcing plate 8, the pressure applied to the flat current collector 11 is the polarizable electrode 31 in the central portion. Concentrate on. As shown in FIG. 3, by inserting the ring-shaped reinforcing plate 8 into the elastic insulating rubber 21 and applying pressure up and down, pressure is also applied to the insulating rubber 21 and the basic cell as a whole. Since the current collectors 11 are bonded together, there is no problem in electrical connection even when the ring-shaped reinforcing plate 8 is made of an insulating material such as ceramic or thermoplastic resin.

（実施例１）
本発明の電気二重層コンデンサの実施例として、まず図５に示した基本セル１を作製した。電解液としては、希硫酸を用い、分極性電極３１としては、粉末活性炭を用いた。セパレータ４１としては、ＰＴＦＥ製微多孔膜を用い、絶縁性ゴム２１としては、ブチルゴムを用いた。集電体１１としては、導電性ゴムを使用した。基本セル１の外径はφ８．１ｍｍとした。図２に示したリング状補強板８は、集電体１１で用いた導電性ゴムを使用し、厚みは０．２ｍｍ、外径はφ８．１ｍｍ、内径はφ６．１ｍｍとした。図３（ａ）に示すように、基本セル１を３枚積層後、リング状補強板８を１枚積層し、更に、基本セル１を３枚積層し、本発明の電気二重層コンデンサの素子基本セル積層体２を作製した。次に、上下から２０ｋｇ／ｃｍ2の圧力を加えて、図３（ａ）の本発明の電気二重層コンデンサ素子１２を作製した。 Example 1
As an example of the electric double layer capacitor of the present invention, a basic cell 1 shown in FIG. 5 was first prepared. Diluted sulfuric acid was used as the electrolytic solution, and powdered activated carbon was used as the polarizable electrode 31. As the separator 41, a PTFE microporous film was used, and as the insulating rubber 21, butyl rubber was used. As the current collector 11, conductive rubber was used. The outer diameter of the basic cell 1 was φ8.1 mm. The ring-shaped reinforcing plate 8 shown in FIG. 2 uses the conductive rubber used in the current collector 11 and has a thickness of 0.2 mm, an outer diameter of φ8.1 mm, and an inner diameter of φ6.1 mm. As shown in FIG. 3A, after laminating three basic cells 1, one ring-shaped reinforcing plate 8 is laminated, and further three basic cells 1 are laminated, and the element of the electric double layer capacitor of the present invention A basic cell laminate 2 was produced. Next, a pressure of 20 kg / cm 2 was applied from above and below to produce the electric double layer capacitor element 12 of the present invention shown in FIG.

次に、電気二重層コンデンサの外装部品は、外装金属ケース１３としては、厚みは０．２ｍｍ、内径はφ１０．４ｍｍのステンレス材（ＳＵＳ４３０）を用いた。絶縁ケース４として、外径はφ１０．０ｍｍ、内径はφ９．６ｍｍのポリアミド樹脂の容器を用いた。第１の電極板１６、第２の電極板２６、第１のリード端子１７、第２のリード端子２７としては、厚みは０．２ｍｍのステンレス材（ＳＵＳ４３０）にＳｎメッキを行ったものを用いた。座板５としてはＰＰＳ樹脂（ポリフェニレンサルファイド樹脂）を用いた。   Next, as the exterior metal case 13, a stainless steel material (SUS430) having a thickness of 0.2 mm and an inner diameter of φ10.4 mm was used for the exterior component of the electric double layer capacitor. As the insulating case 4, a polyamide resin container having an outer diameter of φ10.0 mm and an inner diameter of φ9.6 mm was used. As the first electrode plate 16, the second electrode plate 26, the first lead terminal 17, and the second lead terminal 27, a stainless steel material (SUS430) having a thickness of 0.2 mm is subjected to Sn plating. It was. PPS resin (polyphenylene sulfide resin) was used as the seat plate 5.

外装金属ケース１３へ、電気二重層コンデンサ素子１２と第１の電極板１６、第２の電極板２６、第１のリード端子１７、第２のリード端子２７と絶縁ケース４を収容し、一定圧力を加えながら外装金属ケース１３を封口し、座板５を設置して電気二重層コンデンサを作製した。   The electric double layer capacitor element 12 and the first electrode plate 16, the second electrode plate 26, the first lead terminal 17, the second lead terminal 27 and the insulating case 4 are accommodated in the outer metal case 13, and fixed pressure The outer metal case 13 was sealed while adding a seat, and the seat plate 5 was installed to produce an electric double layer capacitor.

（実施例２）
基本セル１及び外装部品の構成は、実施例１と同じものを用い、リング状補強板８の材質のみを変更し、材質をステンレス材（ＳＵＳ４３０）、厚みは０．２ｍｍ、外径はφ８．１ｍｍ、内径はφ６．１ｍｍとしたものを用い、電気二重層コンデンサを作製した。 (Example 2)
The configurations of the basic cell 1 and the exterior parts are the same as those of the first embodiment, only the material of the ring-shaped reinforcing plate 8 is changed, the material is stainless steel (SUS430), the thickness is 0.2 mm, and the outer diameter is φ8. An electric double layer capacitor having a diameter of 1 mm and an inner diameter of φ6.1 mm was produced.

（実施例３）
基本セル１及び外装部品の構成は、実施例１と同じものを用い、リング状補強板８の材質のみ変更し、材質はアルミナで厚みは０．２ｍｍ、外径はφ８．１ｍｍ、内径はφ６．１ｍｍとしたものを用い、電気二重層コンデンサを作製した。 (Example 3)
The structure of the basic cell 1 and the exterior parts is the same as that of Example 1, and only the material of the ring-shaped reinforcing plate 8 is changed. The material is alumina, the thickness is 0.2 mm, the outer diameter is φ8.1 mm, and the inner diameter is φ6. An electric double layer capacitor was produced using a 0.1 mm thickness.

（実施例４）
基本セル１及び外装部品の構成は、実施例１と同じものを用い、リング状補強板８の材質のみ変更し、材質はＰＰＳ樹脂、厚みは０．２ｍｍ、外径はφ８．１ｍｍ、内径はφ６．１ｍｍとしたものを用い、電気二重層コンデンサを作製した。 Example 4
The structure of the basic cell 1 and the exterior parts is the same as in Example 1, and only the material of the ring-shaped reinforcing plate 8 is changed. The material is PPS resin, the thickness is 0.2 mm, the outer diameter is φ8.1 mm, and the inner diameter is An electric double layer capacitor was manufactured using a φ6.1 mm.

（比較例）
一方、比較例として、図４（ａ）に示した従来の電気二重層コンデンサ第１の例の構成で本発明の実施例１と同じ材質のものを用い、リング状補強板８を挿入することなく基本セル１を積層して電気二重層コンデンサ素子１９を作製して電気二重層コンデンサを作製した。 (Comparative example)
On the other hand, as a comparative example, the structure of the first example of the conventional electric double layer capacitor shown in FIG. 4A is made of the same material as that of Example 1 of the present invention, and the ring-shaped reinforcing plate 8 is inserted. Instead, the basic cell 1 was laminated to produce an electric double layer capacitor element 19 to produce an electric double layer capacitor.

以上のように作製した比較例１から４と比較例の電気二重層コンデンサについて、各々１００個を２０個ずつ５枚のプリント配線基板に自動実装し、それぞれのプリント基板をリフロー炉内の最高温度が２２０℃、２３０℃、２４０℃、２５０℃、２６０℃としてリフロー半田付けを行った。比較例１から４と比較例の電気二重層コンデンサについて、各々１００個は外装金属ケースの上面は平面であるので、自動実装での不具合は無かった。素子不具合(液漏れ)の発生数の結果を表１に示す。   About each of the electric double layer capacitors of Comparative Examples 1 to 4 and Comparative Example manufactured as described above, 100 of each were automatically mounted on 5 printed circuit boards, and each printed circuit board was subjected to the maximum temperature in the reflow furnace. Was 220 ° C., 230 ° C., 240 ° C., 250 ° C., 260 ° C., and reflow soldering was performed. About 100 each of the electric double layer capacitors of Comparative Examples 1 to 4 and Comparative Example, the upper surface of the outer metal case was a flat surface, so there was no problem in automatic mounting. Table 1 shows the results of the number of device failures (liquid leakage).

Figure 0005116102
Figure 0005116102

表１に示したように、比較例ではリフロー温度が２４０℃以上で素子不具合(液漏れ)が発生したのに対し、実施例１から実施例４による電気二重層コンデンサは、素子不具合(液漏れ)の発生が無く、集電体と絶縁性ゴムの接着界面の圧縮圧力が増加し、電解液の封止力が向上し、リフロー半田付け時の高温環境下における、電解液の漏れを防止でき、電気二重層コンデンサの耐熱性を向上することができた。   As shown in Table 1, in the comparative example, device failure (liquid leakage) occurred when the reflow temperature was 240 ° C. or higher, whereas the electric double layer capacitors according to Examples 1 to 4 had device failure (liquid leakage). ) Does not occur, the compression pressure at the adhesive interface between the current collector and insulating rubber increases, the electrolyte sealing power improves, and leakage of the electrolyte in a high-temperature environment during reflow soldering can be prevented. The heat resistance of the electric double layer capacitor could be improved.

実施例及び比較例の電気二重層コンデンサについて、高温負荷試験を各１０個実施し、信頼性評価を行なった。高温負荷の条件は８５℃で５．５Ｖの電圧を入力した。電気二重層コンデンサに高温負荷を２４０時間、５００時間、１０００時間加えた後に、等価直列抵抗（ＥＳＲ）と静電容量変化率（ΔＣ／Ｃ）と３０分充電時の電流値を測定した。   About the electric double layer capacitor of an Example and a comparative example, ten high temperature load tests were implemented, respectively, and reliability evaluation was performed. The condition of the high temperature load was a voltage of 5.5V at 85 ° C. After applying a high-temperature load to the electric double layer capacitor for 240 hours, 500 hours, and 1000 hours, the equivalent series resistance (ESR), the capacitance change rate (ΔC / C), and the current value at the time of charging for 30 minutes were measured.

図７に、高温負荷試験を実施した電気二重層コンデンサのＥＳＲ（等価直列抵抗）の測定結果を示す。図８に、高温負荷試験を実施した電気二重層コンデンサの静電容量変化率（ΔＣ／Ｃ）測定結果を示す。図９に、高温負荷試験を実施した電気二重層コンデンサの３０分充電時の電流値測定結果を示す。図７、図８、図９ともに、グラフの値は電気二重層コンデンサ１０個の測定値の平均値であり、横軸の０での測定値は初期値を表す。   FIG. 7 shows the measurement result of ESR (equivalent series resistance) of the electric double layer capacitor subjected to the high temperature load test. FIG. 8 shows the measurement result of the capacitance change rate (ΔC / C) of the electric double layer capacitor subjected to the high temperature load test. FIG. 9 shows a current value measurement result at the time of charging for 30 minutes of the electric double layer capacitor subjected to the high temperature load test. 7, 8, and 9, the values in the graph are average values of the measured values of 10 electric double layer capacitors, and the measured value at 0 on the horizontal axis represents the initial value.

図７より、１０００時間の高温負荷試験後のＥＳＲの値の変化が比較例では初期値と比べて１０Ωも上昇しているのに対し、実施例１から実施例４による電気二重層コンデンサは、５Ω以下の上昇となった。図８より、１０００時間の高温負荷試験後の静電容量変化率の変化が比較例では３５％を超えて低下しているのに対し、実施例１から実施例４による電気二重層コンデンサは、２０％以下の低下となった。図９より、高温負荷試験後の３０分充電時の電流値に対しては、比較例では５００時間以上で１５μＡ以上となっているが、実施例１から実施例４では１０００時間でも１５μＡ以下となった。   From FIG. 7, the change in the ESR value after the high-temperature load test for 1000 hours is 10 Ω higher than the initial value in the comparative example, whereas the electric double layer capacitors according to Example 1 to Example 4 are It rose below 5Ω. From FIG. 8, the change in the capacitance change rate after the high temperature load test for 1000 hours is lower than 35% in the comparative example, whereas the electric double layer capacitors according to Example 1 to Example 4 are The decrease was 20% or less. From FIG. 9, the current value at the time of charging for 30 minutes after the high temperature load test is 15 μA or more in 500 hours or more in the comparative example, but 15 μA or less even in 1000 hours in Example 1 to Example 4. became.

高温負荷試験の結果、実施例１から実施例４は、リング状補強板を挿入する構造として、基本セルの集電体と絶縁性ゴムの接着界面の圧力が向上したことにより、電解液の封止性が向上し、等価直列抵抗の上昇が抑制され、静電容量の変化率も低下し信頼性を向上することができものと考えられる。   As a result of the high-temperature load test, in Examples 1 to 4, the structure in which the ring-shaped reinforcing plate is inserted has improved the pressure at the bonding interface between the current collector of the basic cell and the insulating rubber. It is considered that the stopping property is improved, the increase of the equivalent series resistance is suppressed, the change rate of the capacitance is also lowered, and the reliability can be improved.

本発明の電気二重層コンデンサの説明図。Explanatory drawing of the electric double layer capacitor of this invention. 本発明のリング状補強板の説明図。図２（ａ）は本発明のリング状補強板の平面図。図２（ｂ）は本発明のリング状補強板のＡ−Ａ面の断面図。Explanatory drawing of the ring-shaped reinforcement board of this invention. Fig.2 (a) is a top view of the ring-shaped reinforcement board of this invention. FIG.2 (b) is sectional drawing of the AA surface of the ring-shaped reinforcement board of this invention. 本発明の電気二重層コンデンサ素子の断面図。図３（ａ）本発明の電気二重層コンデンサの基本セル積層体の断面図。図３（ｂ）上下から加圧された状態の断面図。Sectional drawing of the electric double layer capacitor | condenser element of this invention. FIG. 3A is a cross-sectional view of the basic cell laminate of the electric double layer capacitor of the present invention. FIG. 3B is a cross-sectional view showing a state where pressure is applied from above and below. 従来の電気二重層コンデンサの説明図。図４（ａ）従来の電気二重層コンデンサの第１の例の説明図。図４（ｂ）従来の電気二重層コンデンサの第２の例の説明図。Explanatory drawing of the conventional electric double layer capacitor. FIG. 4A is an explanatory diagram of a first example of a conventional electric double layer capacitor. FIG. 4B is an explanatory diagram of a second example of a conventional electric double layer capacitor. 従来の電気二重層コンデンサの基本セルの断面図。Sectional drawing of the basic cell of the conventional electric double layer capacitor. 従来の電気二重層コンデンサ素子の断面図。図６（ａ）従来の電気二重層コンデンサの基本セル積層体の断面図。図６（ｂ）上下から加圧された状態の断面図。Sectional drawing of the conventional electric double layer capacitor | condenser element. FIG. 6A is a cross-sectional view of a basic cell laminate of a conventional electric double layer capacitor. FIG. 6B is a cross-sectional view showing a state where pressure is applied from above and below. 高温負荷試験を実施した電気二重層コンデンサの等価直列抵抗（ＥＳＲ）測定結果。The equivalent series resistance (ESR) measurement result of the electric double layer capacitor which performed the high temperature load test. 高温負荷試験を実施した電気二重層コンデンサの静電容量変化率（ΔＣ／Ｃ）測定結果。Measurement result of capacitance change rate (ΔC / C) of electric double layer capacitor subjected to high temperature load test. 高温負荷試験を実施した電気二重層コンデンサの３０分充電時の電流値測定結果。The current value measurement result at the time of 30-minute charge of the electric double layer capacitor which implemented the high temperature load test.

符号の説明Explanation of symbols

１ 基本セル
２、９ 基本セル積層体
４ 絶縁ケース
５ 座板
８ リング状補強板
１１ 集電体
１２、１９ 電気二重層コンデンサ素子
１３ 外装金属ケース
１６ 第１の電極板
１７ 第１のリード端子
１８ 隙間
２１ 絶縁性ゴム
２３ 凸部付き外装金属ケース
２６ 第２の電極板
２７ 第２のリード端子
３１ 分極性電極
４１ セパレータ DESCRIPTION OF SYMBOLS 1 Basic cell 2, 9 Basic cell laminated body 4 Insulation case 5 Seat plate 8 Ring-shaped reinforcement board 11 Current collector 12, 19 Electric double layer capacitor element 13 Exterior metal case 16 1st electrode plate 17 1st lead terminal 18 Gap 21 Insulating rubber 23 External metal case 26 with projections Second electrode plate 27 Second lead terminal 31 Polarized electrode 41 Separator

Claims (3)

電解液を含んだ炭素材料からなる分極性電極と、導電性ゴムからなる集電体の対がセパレータを介して対向して配置され、外周部を絶縁性ゴムで封止されてなる電気二重層コンデンサ基本セルを複数積層した積層体に上下から圧力を加えてなる電気二重層コンデンサ素子の加圧状態を保持して外装金属ケースに収容し、前記電気二重層コンデンサ素子の２つの極性に接続された電極板と前記電極板に接続された２つのリード端子を備えてなる電気二重層コンデンサであって、前記電気二重層コンデンサ素子は、複数の前記電気二重層コンデンサ基本セルの積層体間に、内周部に上面及び下面から厚みの中心に向けて中央部が突出したテーパーを有するリング状補強板を挿入し上下から圧力を加えてなることを特徴とする電気二重層コンデンサ。 An electric double layer in which a polarizable electrode made of a carbon material containing an electrolytic solution and a pair of current collectors made of conductive rubber are arranged opposite to each other with a separator interposed therebetween, and the outer peripheral portion is sealed with insulating rubber The electric double layer capacitor element formed by applying pressure from above and below to a laminate in which a plurality of capacitor basic cells are stacked is held in an outer metal case and connected to the two polarities of the electric double layer capacitor element. An electric double layer capacitor comprising an electrode plate and two lead terminals connected to the electrode plate, wherein the electric double layer capacitor element is disposed between a stack of the plurality of electric double layer capacitor basic cells . electric double layer capacitor central portion is characterized by comprising applying a pressure from above and below by inserting the ring-like reinforcing plate having a tapered protruding toward the inner periphery from the upper and lower surfaces of the thickness at the center 前記リング状補強板の外径寸法は、前記電気二重層コンデンサ素子の外径寸法と同等で、前記リング状補強板の内径寸法は、前記絶縁性ゴムの内径寸法と同等であることを特徴とする請求項１に記載の電気二重層コンデンサ。   The outer diameter dimension of the ring-shaped reinforcing plate is equal to the outer diameter dimension of the electric double layer capacitor element, and the inner diameter dimension of the ring-shaped reinforcing plate is equal to the inner diameter dimension of the insulating rubber. The electric double layer capacitor according to claim 1. 前記リング状の補強板は、導電性ゴム、ステンレス、アルミニウム、鉄等の金属材料、セラミック材料、熱可塑性樹脂の１つからなることを特徴とする請求項１または２に記載の電気二重層コンデンサ。 3. The electric double layer capacitor according to claim 1, wherein the ring-shaped reinforcing plate is made of one of a conductive rubber, a metal material such as stainless steel, aluminum, and iron, a ceramic material, and a thermoplastic resin. .
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