JP2011029425A - Electric double-layer capacitor and method of manufacturing the same - Google Patents

Electric double-layer capacitor and method of manufacturing the same Download PDF

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JP2011029425A
JP2011029425A JP2009173953A JP2009173953A JP2011029425A JP 2011029425 A JP2011029425 A JP 2011029425A JP 2009173953 A JP2009173953 A JP 2009173953A JP 2009173953 A JP2009173953 A JP 2009173953A JP 2011029425 A JP2011029425 A JP 2011029425A
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case
extraction electrode
electrode portion
electric double
capacitor element
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Tomohiko Kawasaki
友彦 川崎
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Nichicon 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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric double-layer capacitor that can electrically connect a lead electrode of a capacitor element with a case with certainty, and fix the capacitor element to the case. <P>SOLUTION: An electric double-layer capacitor 1 has a cylindrical capacitor element 10 and a bottomed cylindrical case 30 in which the capacitor element 10 is housed in a state that electrolyte is impregnated. The case 30 is formed by a conductive material. The capacitor element 10 has a structure in which an anode foil 11 and a cathode foil 12 are wound via a separator 13. The anode foil 11 and the cathode foil 12 have lead electrodes 14a and 16a at one end opposite in a width direction to each other, respectively. The lead electrode 16a and the case 30 are formed to be constricted in an annular shape. The lead electrode 16a is pressed by the end of the constricted shape of the case 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、コンデンサ素子の両端に引出し電極部を有する電気二重層コンデンサおよびその製造方法に関する。   The present invention relates to an electric double layer capacitor having lead electrode portions at both ends of a capacitor element and a method for manufacturing the same.

電気二重層コンデンサとは、電極（分極性電極）と電解液の界面において、極めて短い距離で電荷が配列される現象（電気二重層）を利用したコンデンサである。
一般に、電気二重層コンデンサのコンデンサ素子は、アルミニウム等の金属箔からなる集電体の上に分極性電極層が形成された陽極箔および陰極箔を、セパレータを介して巻回することによって得られる。電気二重層コンデンサは、このようなコンデンサ素子が、電解液を含浸した状態で、アルミニウム等からなる有底筒状のケースに収納されたものである（例えば、特許文献１、２参照）。 An electric double layer capacitor is a capacitor that utilizes a phenomenon (electric double layer) in which charges are arranged at an extremely short distance at the interface between an electrode (polarizable electrode) and an electrolyte.
Generally, a capacitor element of an electric double layer capacitor is obtained by winding an anode foil and a cathode foil in which a polarizable electrode layer is formed on a current collector made of a metal foil such as aluminum, through a separator. . An electric double layer capacitor is one in which such a capacitor element is housed in a bottomed cylindrical case made of aluminum or the like in a state impregnated with an electrolytic solution (see, for example, Patent Documents 1 and 2).

また、特許文献１の電気二重層コンデンサにおいては、分極性電極から電荷を引き出すために、陽極箔および陰極箔の幅方向に関して互いに逆の一端部に、それぞれ引出し電極部を形成して、コンデンサ素子の両端に引出し電極部を設けており、一方の引出し電極部はケースの底面に接触させることにより電気的に接続され、他方の引出し電極部は、リード棒に溶接等によって接続されている。   Further, in the electric double layer capacitor disclosed in Patent Document 1, in order to draw charges from the polarizable electrode, a lead electrode portion is formed at one end opposite to each other with respect to the width direction of the anode foil and the cathode foil. Lead electrode portions are provided at both ends of the lead electrode, and one lead electrode portion is electrically connected by contacting the bottom surface of the case, and the other lead electrode portion is connected to the lead bar by welding or the like.

また、特許文献１の電気二重層コンデンサでは、コンデンサ素子はケースに固定されていない。そのため、このような電気二重層コンデンサに大きな振動が加わった場合、内部のコンデンサ素子にも負荷がかかるため、リード棒と引出し電極部との溶接部分に負荷がかかり、最悪の場合破損してしまう。また、ケースの底面と引出し電極部とは単に接触させただけなので振動により離れてしまう場合がある。   In the electric double layer capacitor disclosed in Patent Document 1, the capacitor element is not fixed to the case. Therefore, when a large vibration is applied to such an electric double layer capacitor, a load is also applied to the internal capacitor element, so that a load is applied to the welded portion between the lead bar and the lead electrode portion, and it is damaged in the worst case. . Further, since the bottom surface of the case and the extraction electrode portion are merely brought into contact with each other, they may be separated by vibration.

特許文献２には、耐振動性を向上させた電気二重層コンデンサが記載されている。特許文献２の電気二重層コンデンサでは、ケースの開口側と底面側の外周面に環状の絞り加工部を形成し、この絞り加工部の内面で引出し電極部の外周面を押圧して固定している。
２つの引出し電極部の一方は、ケースの底面にレーザー溶接によって接続されており、他方の引出し電極部は、ケースの開口端に配置されて封止材を兼ねる端子板に、接触により接続されている。また、他方の引出し電極部の外周面とケースの内周面との間には、短絡防止のために絶縁部材が配置されている。 Patent Document 2 describes an electric double layer capacitor with improved vibration resistance. In the electric double layer capacitor disclosed in Patent Document 2, annular drawn portions are formed on the outer peripheral surfaces of the opening and bottom sides of the case, and the outer peripheral surface of the extraction electrode portion is pressed and fixed on the inner surface of the drawn portion. Yes.
One of the two extraction electrode portions is connected to the bottom surface of the case by laser welding, and the other extraction electrode portion is connected to a terminal plate arranged at the opening end of the case and serving as a sealing material by contact. Yes. Further, an insulating member is disposed between the outer peripheral surface of the other extraction electrode portion and the inner peripheral surface of the case to prevent a short circuit.

特許第３０１３０４７号公報Japanese Patent No. 3013047 特開２００７−２５８４１４号公報JP 2007-258414 A

しかしながら、特許文献２の電気二重層コンデンサでは、ケースの底面に引出し電極部を接続しているが、引出し電極部の端面は、渦巻き状に巻回された金属箔の縁で構成されるため、引出し電極部に端面を完全に揃えるのは難しく、また、巻回工程の際に箔の位置ずれが生じやすい。また、ケースに絞り加工部を形成して、コンデンサ素子とケースとを固定しているため、引出し電極部がケースの絞り加工部によって押圧されることにより、引出し電極部の外縁部の筒軸方向長さが、中央部の筒軸方向長さよりも短くなる場合がある。
さらに、ケースの底面と引出し電極部との溶接は、コンデンサ素子の中央に形成された空洞部から溶接用の治具等を挿入して行うため、溶接状態を視認することができない。
また、引出し電極部の端面全体をケース底面に溶接することは一般に困難であり、引出し電極部の端面の一部しか、ケース底面に溶接されない場合があるため、引出し電極部とケースとの電気的接続が不十分となり、信頼性は低い。 However, in the electric double layer capacitor of Patent Document 2, the extraction electrode portion is connected to the bottom surface of the case, but the end surface of the extraction electrode portion is constituted by the edge of the metal foil wound in a spiral shape, It is difficult to completely align the end face with the extraction electrode portion, and the foil is likely to be displaced during the winding process. In addition, since the drawing part is formed in the case and the capacitor element and the case are fixed, when the extraction electrode part is pressed by the drawing part of the case, the outer peripheral part of the extraction electrode part is in the cylinder axis direction. The length may be shorter than the length of the central portion in the cylinder axis direction.
Furthermore, since welding between the bottom surface of the case and the extraction electrode portion is performed by inserting a welding jig or the like through a cavity formed in the center of the capacitor element, the welding state cannot be visually confirmed.
Also, it is generally difficult to weld the entire end surface of the extraction electrode portion to the bottom surface of the case, and only a part of the end surface of the extraction electrode portion may be welded to the bottom surface of the case. Connection is insufficient and reliability is low.

また、一般的に、溶接部は残留応力による脆弱な箇所が存在するため、急激な温度変化を繰り返すような環境に特許文献２に記載の電気二重層コンデンサを設置した場合、引出し電極部とケース底面との溶接部分が、熱サイクルを負荷した際の低温時に金属収縮によって割れてしまい、電気的接続が遮断されてしまう場合がある。   In general, since the welded portion has a fragile portion due to residual stress, when the electric double layer capacitor described in Patent Document 2 is installed in an environment where rapid temperature changes are repeated, the lead electrode portion and the case The welded portion with the bottom surface may break due to metal shrinkage at a low temperature when a thermal cycle is loaded, and the electrical connection may be interrupted.

そこで、本発明は、コンデンサ素子の引出し電極部を確実にケースに電気的に良好な状態で接続すると共に、コンデンサ素子をケースに固定することのできる電気二重層コンデンサおよびその製造方法を提供することを目的とする。   Accordingly, the present invention provides an electric double layer capacitor capable of securely connecting the lead electrode portion of the capacitor element to the case in an electrically good state and fixing the capacitor element to the case, and a method for manufacturing the same. With the goal.

第１の発明の電気二重層コンデンサは、陽極箔と陰極箔とがセパレータを介して巻回されたコンデンサ素子と、前記コンデンサ素子が電解液を含浸した状態で収納される有底筒状のケースとを含む電気二重層コンデンサであって、前記陽極箔および陰極箔の一方が、幅方向一端部に第１引出し電極部を有しており、前記ケースの周面は、少なくとも前記第１引出し電極部に相当する領域が、導電性材料で形成されており、さらに、前記第１引出し電極部と前記ケースとは、環状に括れた形状に形成されており、前記ケースの括れた形状の先端部によって、前記第１引出し電極部が押圧されていることを特徴とする。   An electric double layer capacitor according to a first aspect of the present invention is a capacitor element in which an anode foil and a cathode foil are wound via a separator, and a bottomed cylindrical case that is housed in a state where the capacitor element is impregnated with an electrolyte. The one of the anode foil and the cathode foil has a first extraction electrode portion at one end in the width direction, and the peripheral surface of the case is at least the first extraction electrode. The region corresponding to the portion is formed of a conductive material, and the first extraction electrode portion and the case are formed in a ring-shaped shape, and the case-shaped distal end portion of the case The first lead electrode portion is pressed by the above.

この構成によると、第１引出し電極部とケースとは、環状に括れた形状に形成されており、ケースの括れた形状の先端部によって、第１引出し電極部が押圧されている。そのため、第１引出し電極部は、全周にわたってケースの内周面と接触しており、引出し電極部の端面をケースの底面に接触させる場合に比べて、大きい接触面積で確実に接触させることができ、安定的にかつ電気的に良好な状態で接続することができる。
また、第１引出し電極部は、ケースの括れた形状の先端部に押圧されてケースに固定されているため、電気二重層コンデンサに大きな振動が加わった場合であっても、電気的接続が安定している。
さらに、第１引出し電極部とケースとを溶接により接続していないため、使用環境温度が急激に変化した場合であっても、接続部分が破損して電気的接続が遮断されることがない。
また、第１引出し電極部とケースとを共に環状に括れた形状に形成することによって、第１引出し電極部とケースとを電気的に接続すると同時に、コンデンサ素子をケースに固定することができるため、素子のケースへの固定と電気的接続とを別工程で行う場合に比べて製造工程を簡略化できる。 According to this configuration, the first extraction electrode portion and the case are formed in an annular shape, and the first extraction electrode portion is pressed by the constricted tip portion of the case. Therefore, the first extraction electrode portion is in contact with the inner peripheral surface of the case over the entire circumference, and can be reliably brought into contact with a large contact area as compared with the case where the end surface of the extraction electrode portion is in contact with the bottom surface of the case. Can be connected in a stable and electrically good state.
In addition, since the first lead electrode portion is pressed to the case-shaped tip and fixed to the case, the electrical connection is stable even when a large vibration is applied to the electric double layer capacitor. is doing.
Furthermore, since the first extraction electrode portion and the case are not connected by welding, even if the use environment temperature changes suddenly, the connection portion is not damaged and the electrical connection is not interrupted.
In addition, since the first extraction electrode portion and the case are both formed in an annular shape, the capacitor element can be fixed to the case at the same time as the first extraction electrode portion and the case are electrically connected. The manufacturing process can be simplified as compared with the case where the element is fixed to the case and electrically connected in separate processes.

第２の発明の電気二重層コンデンサは、前記第１の発明において、前記陽極箔および前記陰極箔の他方が、幅方向に関して前記第１引出し電極部と反対側に、第２引出し電極部を有し、前記第２引出し電極部を覆う円筒状の端子部材を備えており、前記第２引出し電極部と、前記端子部材とが、環状に括れた形状に形成され、前記端子部材の括れた形状の先端部によって、前記第２引出し電極部が押圧されていることを特徴とする。   The electric double layer capacitor according to a second invention is the electric double layer capacitor according to the first invention, wherein the other of the anode foil and the cathode foil has a second extraction electrode portion on the opposite side to the first extraction electrode portion in the width direction. And a cylindrical terminal member covering the second extraction electrode portion, wherein the second extraction electrode portion and the terminal member are formed in a ring-shaped shape, and the terminal member is constricted The second extraction electrode portion is pressed by the tip portion of the first electrode portion.

この構成によると、第２引出し電極部と端子部材とは、環状に括れた形状に形成されており、端子部材の括れた形状の先端部によって、第２引出し電極部が押圧されている。そのため、第２引出し電極部は、全周にわたって端子部材の内周面と接触しており、引出し電極部の端面を板状の接続用部材に接触させる場合に比べて、大きい接触面積で確実に接触させることができ、安定的に電気的に接続することができる。
また、第２引出し電極部が端子部材の括れた形状に押圧されることによって、第２引出し電極部と端子部材とは固定されているため、電気二重層コンデンサに大きな振動が加わった場合であっても、第２引出し電極部と端子部材との電気的接続を維持することができる。
さらに、第２引出し電極部と端子部材との接続に溶接を用いていないため、使用環境温度が急激に変化した場合であっても、接続部分が破損して電気的接続が遮断されることがない。 According to this configuration, the second extraction electrode portion and the terminal member are formed in an annular shape, and the second extraction electrode portion is pressed by the constricted tip portion of the terminal member. For this reason, the second extraction electrode portion is in contact with the inner peripheral surface of the terminal member over the entire circumference, so that the second extraction electrode portion can be reliably provided with a large contact area as compared with the case where the end surface of the extraction electrode portion is brought into contact with the plate-like connection member. They can be brought into contact with each other and can be stably electrically connected.
Further, since the second extraction electrode portion and the terminal member are fixed by pressing the second extraction electrode portion into the constricted shape of the terminal member, this is a case where a large vibration is applied to the electric double layer capacitor. However, the electrical connection between the second extraction electrode portion and the terminal member can be maintained.
Furthermore, since welding is not used for the connection between the second extraction electrode portion and the terminal member, even if the operating environment temperature changes suddenly, the connection portion may be damaged and the electrical connection may be interrupted. Absent.

第３の発明の電気二重層コンデンサは、前記第２の発明において、前記ケースの周面が、導電性材料で形成されており、前記端子部材の外周面と、前記ケースの内周面との間に、絶縁部材が介在しており、前記ケースが、前記端子部材の前記括れた形状に沿った形状に形成されていることを特徴とする。   An electric double layer capacitor according to a third invention is the electric double layer capacitor according to the second invention, wherein the peripheral surface of the case is formed of a conductive material, and the outer peripheral surface of the terminal member and the inner peripheral surface of the case An insulating member is interposed therebetween, and the case is formed in a shape along the constricted shape of the terminal member.

この構成によると、端子部材とケースとの間に絶縁部材が介在しているため、端子部材とケースとの短絡を防止できる。
また、ケースと絶縁部材とは、端子部材の括れた形状に沿った形状に形成されているため、ケースと端子部材、即ち、ケースとコンデンサ素子とを固定することができる。 According to this configuration, since the insulating member is interposed between the terminal member and the case, a short circuit between the terminal member and the case can be prevented.
Moreover, since the case and the insulating member are formed in a shape along the constricted shape of the terminal member, the case and the terminal member, that is, the case and the capacitor element can be fixed.

第４の発明の電気二重層コンデンサは、前記第１〜３の何れかの発明において前記第１引出し電極部の外周面と、前記ケースの内周面との間に、金属箔が介在していることを特徴とする。   The electric double layer capacitor according to a fourth aspect of the present invention is the electric double layer capacitor according to any one of the first to third aspects, wherein a metal foil is interposed between the outer peripheral surface of the first lead electrode portion and the inner peripheral surface of the case. It is characterized by being.

この構成によると、第１引出し電極部の括れた形状の先端部付近と、ケースの括れた形状の先端部付近との間の隙間が、金属箔で埋められるため、第１引出し電極部とケースとを電気的により確実に接続することができる。   According to this configuration, the gap between the constricted shape of the first extraction electrode portion and the vicinity of the constricted shape of the case is filled with the metal foil, so that the first extraction electrode portion and the case Can be electrically connected more reliably.

第５の発明の電気二重層コンデンサの製造方法は、陽極箔および陰極箔の一方の幅方向一端部に第１引出し電極部を形成し、前記陽極箔と前記陰極箔とをセパレータを介して巻回して、コンデンサ素子を形成する工程と、前記コンデンサ素子に電解液を含浸させた後、少なくとも前記第１引出し電極部に相当する領域が導電性材料で形成されている有底筒状のケースに前記コンデンサ素子を挿入する工程と、前記第１引出し電極部と前記ケースとを、前記ケースの外側から環状に絞り加工して、前記第１引出し電極部と前記ケースとを電気的に接続すると同時に、前記コンデンサ素子を前記ケースに固定する工程とを含むことを特徴とする。   According to a fifth aspect of the present invention, there is provided a method for producing an electric double layer capacitor, wherein a first lead electrode portion is formed at one end in the width direction of an anode foil and a cathode foil, and the anode foil and the cathode foil are wound via a separator. A step of forming a capacitor element, and after impregnating the capacitor element with an electrolytic solution, at least a region corresponding to the first extraction electrode portion is formed in a bottomed cylindrical case formed of a conductive material At the same time as the step of inserting the capacitor element, the first extraction electrode portion and the case are annularly drawn from the outside of the case to electrically connect the first extraction electrode portion and the case And a step of fixing the capacitor element to the case.

この構成によると、第１引出し電極部とケースとは、ケース外周から環状に絞り加工することによって、互いに固定されている。そのため、第１引出し電極部は、全周にわたってケースの内周面と接触しており、引出し電極部の端面をケースの底面に接触させる場合に比べて、大きい接触面積で確実に接触させることができ、安定的かつ電気的に良好な状態で接続することができる。
また、第１引出し電極部は、絞り加工によってケースに固定されているため、電気二重層コンデンサは耐振動性に優れている。
さらに、第１引出し電極部とケースとの接続に溶接を用いていないため、環境温度が急激に変化した場合であっても、接続部分が破損して電気的接続が遮断されることがない。
また、第１引出し電極部とケースとを絞り加工することによって、第１引出し電極部とケースとを電気的に接続すると同時に、コンデンサ素子をケースに固定することができるため、素子のケースへの固定と電気的接続とを別工程で行う場合に比べて製造工程を簡略化できる。 According to this configuration, the first extraction electrode portion and the case are fixed to each other by drawing the ring from the outer periphery of the case. Therefore, the first extraction electrode portion is in contact with the inner peripheral surface of the case over the entire circumference, and can be reliably brought into contact with a large contact area as compared with the case where the end surface of the extraction electrode portion is in contact with the bottom surface of the case. Can be connected in a stable and electrically good state.
Moreover, since the 1st extraction electrode part is being fixed to the case by the drawing process, the electric double layer capacitor is excellent in vibration resistance.
Furthermore, since welding is not used for connection between the first extraction electrode portion and the case, even if the environmental temperature changes suddenly, the connection portion is not damaged and the electrical connection is not interrupted.
Further, by drawing the first extraction electrode part and the case, the capacitor element can be fixed to the case at the same time as the first extraction electrode part and the case are electrically connected. The manufacturing process can be simplified as compared with the case where fixing and electrical connection are performed in separate processes.

本発明の電気二重層コンデンサによると、引出し電極部とケースとを電気的に確実に接続することができると同時に、コンデンサ素子をケースに固定することができる。   According to the electric double layer capacitor of the present invention, the extraction electrode portion and the case can be electrically connected reliably and at the same time, the capacitor element can be fixed to the case.

本発明の実施形態に係る電気二重層コンデンサの断面図である。It is sectional drawing of the electric double layer capacitor which concerns on embodiment of this invention. コンデンサ素子の分解斜視図である。It is a disassembled perspective view of a capacitor element. コンデンサ素子の部分拡大断面図である。It is a partial expanded sectional view of a capacitor element. （ａ）は端子部材の平面図であって、（ｂ）は端子部材の正面図である。(A) is a top view of a terminal member, (b) is a front view of a terminal member. （ａ）は絶縁部材の平面図であって、（ｂ）は絶縁部材の正面図である。(A) is a top view of an insulating member, (b) is a front view of an insulating member. 電気二重層コンデンサの製造工程において、コンデンサ素子をケース内に挿入したときの図である。It is a figure when a capacitor | condenser element is inserted in a case in the manufacturing process of an electrical double layer capacitor. 他の実施形態に係る電気二重層コンデンサの断面図である。It is sectional drawing of the electric double layer capacitor which concerns on other embodiment.

以下、本発明の実施の形態について説明する。
図１に示すように、本実施形態の電気二重層コンデンサ１は、コンデンサ素子１０と、コンデンサ素子１０を収納するケース３０と、端子部材２０と、絶縁部材４０とを有する。 Embodiments of the present invention will be described below.
As shown in FIG. 1, the electric double layer capacitor 1 of this embodiment includes a capacitor element 10, a case 30 that houses the capacitor element 10, a terminal member 20, and an insulating member 40.

図２に示すように、コンデンサ素子１０は、陽極箔１１と陰極箔１２とがセパレータ１３を介して円筒状に巻回された構造を有する。図１に示すように、コンデンサ素子１０の外周面の幅方向略中央部には、巻き止めテープ１８が巻き付けられている。   As shown in FIG. 2, the capacitor element 10 has a structure in which an anode foil 11 and a cathode foil 12 are wound in a cylindrical shape via a separator 13. As shown in FIG. 1, a winding stop tape 18 is wound around a substantially central portion in the width direction of the outer peripheral surface of the capacitor element 10.

図２および図３に示すように、陽極箔１１は、例えばアルミニウム箔等の金属箔からなる集電体１４と、この集電体１４の両面に形成された分極性電極層１５とから構成されている。陰極箔１２も陽極箔１１と同じく、例えばアルミニウム箔等の金属箔からなる集電体１６と、この集電体１６の両面に形成された分極性電極層１７とから構成されている。なお、分極性電極層１５、１７は、集電体１４、１６の片面にのみ形成されていてもよい。   As shown in FIGS. 2 and 3, the anode foil 11 is composed of a current collector 14 made of a metal foil such as an aluminum foil, and a polarizable electrode layer 15 formed on both surfaces of the current collector 14. ing. Similarly to the anode foil 11, the cathode foil 12 includes a current collector 16 made of a metal foil such as an aluminum foil, and a polarizable electrode layer 17 formed on both surfaces of the current collector 16. The polarizable electrode layers 15 and 17 may be formed only on one side of the current collectors 14 and 16.

陽極箔１１の分極性電極層１５は、集電体１４の幅方向の一端側（図２中左側）に形成されている。これにより、陽極箔１１は、幅方向の他端側（図２中右側）に、集電体１４のみからなる陽極側引出し電極部１４ａを有する。
陰極箔１２の分極性電極層１７は、集電体１６の幅方向の一端側（図２中右側）に形成されている。これにより、陰極箔１２は、幅方向の他端側（図２中左側）に、集電体１６のみからなる陰極側引出し電極部１６ａを有する。 The polarizable electrode layer 15 of the anode foil 11 is formed on one end side in the width direction of the current collector 14 (left side in FIG. 2). Thereby, the anode foil 11 has the anode side extraction electrode part 14a which consists only of the electrical power collector 14 in the other end side (right side in FIG. 2) of the width direction.
The polarizable electrode layer 17 of the cathode foil 12 is formed on one end side in the width direction of the current collector 16 (right side in FIG. 2). Thereby, the cathode foil 12 has the cathode side extraction electrode part 16a which consists only of the electrical power collector 16 in the other end side (left side in FIG. 2) of the width direction.

分極性電極層１５、１７の幅は互いに同じである。陽極箔１１と陰極箔１２とは、分極性電極層１５、１７がセパレータ１３を介して対向した状態で巻回されている。そのため、コンデンサ素子１０は、両端部に、陽極側引出し電極部１４ａと陰極側引出し電極部１６ａを有する。   The widths of the polarizable electrode layers 15 and 17 are the same. The anode foil 11 and the cathode foil 12 are wound with the polarizable electrode layers 15 and 17 facing each other with the separator 13 therebetween. Therefore, the capacitor element 10 has an anode side extraction electrode portion 14a and a cathode side extraction electrode portion 16a at both ends.

分極性電極層１５、１７は、活性炭粉末を有する組成物で構成されており、例えば、集電体１４、１６の表面に、活性炭粉末、カーボンブラック、およびフッ素系樹脂バインダーからなるスラリーを一定の厚さで塗布し、乾燥することによって形成されている。   The polarizable electrode layers 15 and 17 are composed of a composition having activated carbon powder. For example, a slurry made of activated carbon powder, carbon black, and a fluororesin binder is fixed on the surfaces of the current collectors 14 and 16. It is formed by coating with a thickness and drying.

図１に示すように、コンデンサ素子１０の陽極側引出し電極部１４ａには、略円筒状の端子部材２０が被せられており、端子部材２０を外周から絞り加工することによって、陽極側引出し電極部１４ａと端子部材２０とは固定されている。   As shown in FIG. 1, a substantially cylindrical terminal member 20 is covered on the anode-side extraction electrode portion 14a of the capacitor element 10, and the anode-side extraction electrode portion is drawn by drawing the terminal member 20 from the outer periphery. 14a and the terminal member 20 are being fixed.

図４に示すように、端子部材２０は、例えばアルミニウム等の導電性材料からなり、筒部２１と、筒部２１の一端を閉塞する円板部２２とから構成されている。円板部２２の外面には、円板状の突出部２２ａが形成されている。   As shown in FIG. 4, the terminal member 20 is made of a conductive material such as aluminum, and includes a cylinder part 21 and a disk part 22 that closes one end of the cylinder part 21. On the outer surface of the disc portion 22, a disc-shaped protrusion 22a is formed.

絞り加工によって、陽極側引出し電極部１４ａと端子部材２０の筒部２１とは、共に環状に括れた形状に形成されており、陽極側引出し電極部１４ａは、端子部材２０の括れた形状部分（絞り加工部２１ａとする）の先端部によって押圧されている。   By drawing, the anode-side extraction electrode portion 14a and the cylindrical portion 21 of the terminal member 20 are both formed into a ring-shaped shape, and the anode-side extraction electrode portion 14a is formed into a shape portion ( It is pressed by the tip of the drawing part 21a.

図１に示すように、コンデンサ素子１０は、電解液を含浸した状態でケース３０に収納されている。電解液としては、例えば、１ｍｏｌ／Ｌのテトラエチルアンモニウムテトラフルオロボレートを溶解したプロピレンカーボネート溶液からなるものが使用される。   As shown in FIG. 1, the capacitor element 10 is accommodated in the case 30 in a state impregnated with an electrolytic solution. As the electrolytic solution, for example, an electrolytic solution made of a propylene carbonate solution in which 1 mol / L tetraethylammonium tetrafluoroborate is dissolved is used.

ケース３０は、例えばアルミニウム等の導電性を有する金属材料からなり、有底筒状に形成されている。
コンデンサ素子１０がケース３０内に収納された状態で、ケース３０の底面近傍部（陰極側引出し電極部１６ａに相当する位置）を外周から絞り加工することにより、陰極側引出し電極部１６ａとケース３０とは固定されている。
この絞り加工によって、陰極側引出し電極部１６ａとケース３０の周面とは、共に環状に括れた形状に形成されており、陰極側引出し電極部１６ａは、ケース３０の括れた形状部分（絞り加工部３０ａとする）の先端部によって押圧されている。 The case 30 is made of a conductive metal material such as aluminum and has a bottomed cylindrical shape.
In a state where the capacitor element 10 is housed in the case 30, a portion near the bottom surface of the case 30 (a position corresponding to the cathode-side extraction electrode portion 16 a) is drawn from the outer periphery, so that the cathode-side extraction electrode portion 16 a and the case 30 are drawn. Is fixed.
By this drawing process, both the cathode-side extraction electrode portion 16a and the peripheral surface of the case 30 are formed in a ring-shaped shape, and the cathode-side extraction electrode portion 16a is formed in a shape portion (drawing process) of the case 30. It is pressed by the tip part of the part 30a).

図１に示すように、端子部材２０の筒部２１の外周面と、ケース３０の内周面との間には、絶縁部材４０が介在している。
図５に示すように、絶縁部材４０は、絶縁性を有する合成樹脂等により形成されており、環状板４２と、環状板４２の外縁から延びる筒部４１とから構成されている。
絶縁部材４０は、環状板４２の中央に形成された孔から端子部材２０の突出部２２ａを外部に露出させた状態で、端子部材２０の外側を覆っている。
端子部材２０に装着された状態での絶縁部材４０の筒部４１の外径は、ケース３０の内径とほぼ同じであってもよいが、若干小さくてもよい。
端子部材２０とケース３０との間に絶縁部材４０を介在させることによって、端子部材２０とケース３０との間の絶縁状態を保ち、端子部材２０とケース３０との短絡を防止している。 As shown in FIG. 1, an insulating member 40 is interposed between the outer peripheral surface of the cylindrical portion 21 of the terminal member 20 and the inner peripheral surface of the case 30.
As shown in FIG. 5, the insulating member 40 is formed of an insulating synthetic resin or the like, and includes an annular plate 42 and a cylindrical portion 41 that extends from the outer edge of the annular plate 42.
The insulating member 40 covers the outside of the terminal member 20 in a state where the protruding portion 22a of the terminal member 20 is exposed to the outside through a hole formed in the center of the annular plate 42.
The outer diameter of the cylindrical portion 41 of the insulating member 40 in a state where it is mounted on the terminal member 20 may be substantially the same as the inner diameter of the case 30, but may be slightly smaller.
By interposing the insulating member 40 between the terminal member 20 and the case 30, the insulating state between the terminal member 20 and the case 30 is maintained, and a short circuit between the terminal member 20 and the case 30 is prevented.

ケース３０の開口端は、巻き込み加工によって絶縁部材４０に食い込んでいる。これにより、ケース３０は密閉されている。   The open end of the case 30 bites into the insulating member 40 by a winding process. Thereby, the case 30 is sealed.

次に、電気二重層コンデンサ１の製造手順について説明する。   Next, the manufacturing procedure of the electric double layer capacitor 1 will be described.

まず、金属箔からなる集電体１４、１６の表面に分極性電極層１５、１７を形成すると共に、集電体１４、１６の幅方向一端部に引出し電極部１４ａ、１６ａを形成して、陽極箔１１と陰極箔１２とを形成した。
その後、図２に示すように、陽極側引出し電極部１４ａと陰極側引出し電極部１６ａとが、幅方向に関して互いに逆になるように陽極箔１１と陰極箔１２とを配置して、陽極箔１１と陰極箔１２とをセパレータ１３を介して巻回してコンデンサ素子１０を形成した。 First, polarizable electrode layers 15 and 17 are formed on the surfaces of current collectors 14 and 16 made of metal foil, and lead electrode portions 14a and 16a are formed at one end in the width direction of current collectors 14 and 16, Anode foil 11 and cathode foil 12 were formed.
Thereafter, as shown in FIG. 2, the anode foil 11 and the cathode foil 12 are disposed so that the anode-side extraction electrode portion 14 a and the cathode-side extraction electrode portion 16 a are opposite to each other in the width direction. And the cathode foil 12 were wound through a separator 13 to form a capacitor element 10.

得られたコンデンサ素子１０の陽極側引出し電極部１４ａに、端子部材２０を被せて、端子部材２０の外周から絞り加工を行い、陽極側引出し電極部１４ａと端子部材２０とを接続した。
その後、図６に示すように、端子部材２０が接続されたコンデンサ素子１０を、電解液に浸漬してから、ケース３０に挿入した。 A terminal member 20 was placed on the anode side extraction electrode portion 14 a of the obtained capacitor element 10, and drawing processing was performed from the outer periphery of the terminal member 20 to connect the anode side extraction electrode portion 14 a and the terminal member 20.
Thereafter, as shown in FIG. 6, the capacitor element 10 to which the terminal member 20 was connected was immersed in the electrolytic solution and then inserted into the case 30.

次に、陰極側引出し電極部１６ａとケース３０とを、ケース３０の外周から環状に絞り加工して、陰極側引出し電極部１６ａとケース３０とを電気的に接続すると同時に、コンデンサ素子１０をケース３０に固定した。   Next, the cathode side extraction electrode portion 16a and the case 30 are drawn into an annular shape from the outer periphery of the case 30, and the cathode side extraction electrode portion 16a and the case 30 are electrically connected, and at the same time, the capacitor element 10 is connected to the case. 30.

最後に、端子部材２０に絶縁部材４０を被せてから、ケース３０の開口端を巻き込み加工によって絶縁部材４０の環状板４２に食い込ませて、ケース３０を密閉した。なお、絶縁部材４０は、ケース３０内に挿入する前の状態のコンデンサ素子１０の端子部材２０に予め被せておいてもよい。   Finally, after covering the terminal member 20 with the insulating member 40, the opening end of the case 30 was engulfed into the annular plate 42 of the insulating member 40 by a winding process, and the case 30 was sealed. The insulating member 40 may be covered in advance on the terminal member 20 of the capacitor element 10 in a state before being inserted into the case 30.

以上説明した電気二重層コンデンサ１においては、上述したように、引出し電極部１４ａ、１６ａと、端子部材２０およびケース３０とは、環状に括れた形状に形成されており、端子部材２０およびケース３０の絞り加工部２１ａ、３０ａの先端部によって、引出し電極部１４ａ、１６ａは押圧されている。
そのため、引出し電極部１４ａ、１６ａは、全周にわたって端子部材２０およびケース３０の内周面に接触しており、引出し電極部の端面をケース３０の底面等に接触させる場合に比べて、大きい接触面積で確実に接触させることができ、安定的にかつ電気的に良好な状態で接続することができる。 In the electric double layer capacitor 1 described above, as described above, the extraction electrode portions 14a and 16a, the terminal member 20 and the case 30 are formed in an annular shape, and the terminal member 20 and the case 30 are formed. The extraction electrode portions 14a and 16a are pressed by the tip portions of the drawing portions 21a and 30a.
Therefore, the extraction electrode portions 14a and 16a are in contact with the inner peripheral surface of the terminal member 20 and the case 30 over the entire circumference, and the contact is greater than when the end surface of the extraction electrode portion is in contact with the bottom surface of the case 30 and the like. Contact can be ensured in terms of area, and the connection can be made stably and electrically in good condition.

また、陰極側引出し電極部１６ａは、ケース３０と共に環状に絞り加工されることによって、引出し電極部１６ａに電気的に接続されると同時に、ケース３０に固定されている。そのため、コンデンサ素子１０のケース３０への固定と電気的接続とを別工程で行う場合に比べて、製造工程を簡略化できる。   Further, the cathode side extraction electrode portion 16 a is fixed to the case 30 at the same time as being electrically connected to the extraction electrode portion 16 a by being drawn into a ring shape together with the case 30. Therefore, the manufacturing process can be simplified as compared with the case where the capacitor element 10 is fixed to the case 30 and electrically connected in separate processes.

陰極側引出し電極部１６ａは、ケース３０の絞り加工部３０ａの先端部に押圧されてケース３０に固定されているため、電気二重層コンデンサ１に大きな振動が加わった場合であっても、負荷によるコンデンサ素子１０のケース３０に対する移動が抑制され、電気二重層コンデンサ１の電気的接続を安定させることができる。   Since the cathode-side extraction electrode portion 16a is pressed against the tip of the drawing portion 30a of the case 30 and fixed to the case 30, even if a large vibration is applied to the electric double layer capacitor 1, it depends on the load. The movement of the capacitor element 10 relative to the case 30 is suppressed, and the electrical connection of the electric double layer capacitor 1 can be stabilized.

また、陽極側引出し電極部１４ａが端子部材２０の絞り加工部２１ａの先端部に押圧されることによって、陽極側引出し電極部１４ａと端子部材２０とは固定されているため、電気二重層コンデンサ１に大きな振動が加わった場合であっても、陽極側引出し電極部１４ａと端子部材２０との接続を強固に維持することができる。   Moreover, since the anode side extraction electrode part 14a and the terminal member 20 are fixed by the anode side extraction electrode part 14a being pressed by the front-end | tip part of the drawing process part 21a of the terminal member 20, the electric double layer capacitor 1 Even when a large vibration is applied to the anode, the connection between the anode-side extraction electrode portion 14a and the terminal member 20 can be firmly maintained.

さらに、引出し電極部１４ａ、１６ａと、ケース３０および端子部材２０との接続に溶接を用いていないため、使用環境温度が急激に変化した場合であっても、接続部分が破損して電気的接続が遮断されることがない。   Further, since welding is not used to connect the extraction electrode portions 14a and 16a to the case 30 and the terminal member 20, even when the use environment temperature changes suddenly, the connection portion is damaged and electrical connection is made. Will not be blocked.

以上、本発明の好適な実施形態を説明したが、上記の実施形態は以下のように変更しても実施することができる。   The preferred embodiment of the present invention has been described above, but the above embodiment can be implemented even if it is changed as follows.

例えば、図７に示すように、ケース３０の開口側の周面が、端子部材２０の括れ形状に沿った形状に形成されていてもよい。
具体的な製造手順としては、端子部材２０と陽極側引出し電極部１４ａとを絞り加工によって接続した後に、ケース３０と絶縁部材４０とを、端子部材２０の外周面の形状に沿って絞り加工してもよいが、陽極側引出し電極部１４ａに端子部材２０を被せただけの状態で、コンデンサ素子１０をケース３０内に挿入し、ケース３０と絶縁部材４０と端子部材２０と陽極側引出し電極部１４ａとを一度にケース３０の外周から絞り加工してもよい。
これにより、ケース３０と端子部材２０、即ち、ケース３０とコンデンサ素子１０とを固定することができる。
また、この場合には、コンデンサ素子１０はケース３０の開口側部分に固定されるため、陰極側引出し電極部１６ａは、ケース３０の底面に接触させただけで、ケース３０の底面近傍部と共に絞り加工されていなくもよい。 For example, as shown in FIG. 7, the peripheral surface on the opening side of the case 30 may be formed in a shape along the constricted shape of the terminal member 20.
As a specific manufacturing procedure, after the terminal member 20 and the anode-side extraction electrode portion 14a are connected by drawing, the case 30 and the insulating member 40 are drawn along the shape of the outer peripheral surface of the terminal member 20. However, the capacitor element 10 is inserted into the case 30 with the terminal member 20 just covered with the anode-side extraction electrode portion 14a, and the case 30, the insulating member 40, the terminal member 20, and the anode-side extraction electrode portion. 14a may be drawn from the outer periphery of the case 30 at a time.
Thereby, the case 30 and the terminal member 20, that is, the case 30 and the capacitor element 10 can be fixed.
Further, in this case, since the capacitor element 10 is fixed to the opening side portion of the case 30, the cathode side extraction electrode portion 16 a is stopped together with the vicinity of the bottom surface of the case 30 only by contacting the bottom surface of the case 30. It may not be processed.

なお、陰極側引出し電極部１６ａとケース３０との間に、アルミニウム等の導電性を有する金属箔を介在させてもよい。
具体的な製造手順としては、例えば、陰極側引出し電極部１６ａの外周面に金属箔を巻き付けた状態で、コンデンサ素子１０をケース３０内に挿入する。
この方法であっても、陰極側引出し電極部１６ａの括れた形状の先端部付近と、ケース３０の底面近傍部の括れた形状の先端部付近との間の隙間が、金属箔で埋められるため、陰極側引出し電極部１６ａとケース３０を電気的により確実に接続することができる。 A conductive metal foil such as aluminum may be interposed between the cathode side extraction electrode portion 16a and the case 30.
As a specific manufacturing procedure, for example, the capacitor element 10 is inserted into the case 30 in a state where a metal foil is wound around the outer peripheral surface of the cathode side extraction electrode portion 16a.
Even with this method, the gap between the constricted tip end portion of the cathode-side extraction electrode portion 16a and the constricted tip end portion near the bottom surface of the case 30 is filled with the metal foil. The cathode side extraction electrode portion 16a and the case 30 can be more reliably connected electrically.

上記実施形態では、陽極側引出し電極部１４ａが、端子部材２０に接続され、陰極側引出し電極部１６ａがケース３０の底面近傍部に接続されているが、逆に、陰極側引出し電極部１６ａが、端子部材２０に接続され、陽極側引出し電極部１４ａがケース３０に接続されていてもよい。   In the above embodiment, the anode-side extraction electrode portion 14a is connected to the terminal member 20, and the cathode-side extraction electrode portion 16a is connected to the vicinity of the bottom surface of the case 30, but conversely, the cathode-side extraction electrode portion 16a is The anode-side extraction electrode portion 14 a may be connected to the case 30 and connected to the terminal member 20.

また、陽極側引出し電極部１４ａは、リード棒等に溶接されていてもよい。   Further, the anode side extraction electrode portion 14a may be welded to a lead rod or the like.

上記実施形態では、コンデンサ素子１０は、ほぼ真円の円筒状であるが、楕円の円筒状であってもよい。   In the above embodiment, the capacitor element 10 has a substantially perfect cylindrical shape, but may have an elliptical cylindrical shape.

１ 電気二重層コンデンサ
１０ コンデンサ素子
１１ 陽極箔
１２ 陰極箔
１３ セパレータ
１４ 集電体（陽極側）
１４ａ 陽極側引出し電極部（第２引出し電極部）
１５ 分極性電極層（陽極側）
１６ 集電体（陰極側）
１６ａ 陰極側引出し電極部（第１引出し電極部）
１７ 分極性電極層（陰極側）
１８ 巻き止めテープ
２０ 端子部材
２１ 筒部
２１ａ 絞り加工部
２２ 円板部
２２ａ 突出部
３０ ケース
３０ａ 絞り加工部
４０ 絶縁部材
４１ 筒部
４２ 環状板 DESCRIPTION OF SYMBOLS 1 Electric double layer capacitor 10 Capacitor element 11 Anode foil 12 Cathode foil 13 Separator 14 Current collector (anode side)
14a Anode-side extraction electrode part (second extraction electrode part)
15 minute polarity electrode layer (anode side)
16 Current collector (cathode side)
16a Cathode side lead electrode part (first lead electrode part)
17 Polarized electrode layer (cathode side)
18 Winding tape 20 Terminal member 21 Tube portion 21a Drawing portion 22 Disc portion 22a Projection portion 30 Case 30a Drawing portion 40 Insulating member 41 Tube portion 42 Annular plate

Claims (5)

陽極箔と陰極箔とがセパレータを介して巻回されたコンデンサ素子と、前記コンデンサ素子が電解液を含浸した状態で収納される有底筒状のケースとを含む電気二重層コンデンサであって、
前記陽極箔および陰極箔の一方が、幅方向一端部に第１引出し電極部を有しており、
前記ケースの周面は、少なくとも前記第１引出し電極部に相当する領域が、導電性材料で形成されており、
さらに、前記第１引出し電極部と前記ケースとは、環状に括れた形状に形成されており、前記ケースの括れた形状の先端部によって、前記第１引出し電極部が押圧されていることを特徴とする電気二重層コンデンサ。 An electric double layer capacitor including a capacitor element in which an anode foil and a cathode foil are wound via a separator, and a bottomed cylindrical case that is stored in a state in which the capacitor element is impregnated with an electrolyte solution,
One of the anode foil and the cathode foil has a first extraction electrode portion at one end in the width direction,
In the peripheral surface of the case, at least a region corresponding to the first extraction electrode portion is formed of a conductive material,
Further, the first extraction electrode portion and the case are formed in a ring-shaped shape, and the first extraction electrode portion is pressed by a constricted tip portion of the case. And electric double layer capacitor. 前記陽極箔および前記陰極箔の他方が、幅方向に関して前記第１引出し電極部と反対側に、第２引出し電極部を有し、
前記第２引出し電極部を覆う円筒状の端子部材を備えており、
前記第２引出し電極部と、前記端子部材とが、環状に括れた形状に形成され、前記端子部材の括れた形状の先端部によって、前記第２引出し電極部が押圧されてい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 other of the anode foil and the cathode foil has a second extraction electrode portion on the side opposite to the first extraction electrode portion in the width direction,
A cylindrical terminal member covering the second extraction electrode portion;
The second extraction electrode portion and the terminal member are formed in an annular shape, and the second extraction electrode portion is pressed by the constricted tip portion of the terminal member. The electric double layer capacitor according to claim 1. 前記ケースの周面が、導電性材料で形成されており、
前記端子部材の外周面と、前記ケースの内周面との間に、絶縁部材が介在しており、
前記ケースが、前記端子部材の前記括れた形状に沿った形状に形成されていることを特徴とする請求項２に記載の電気二重層コンデンサ。 The peripheral surface of the case is formed of a conductive material,
An insulating member is interposed between the outer peripheral surface of the terminal member and the inner peripheral surface of the case,
The electric double layer capacitor according to claim 2, wherein the case is formed in a shape along the constricted shape of the terminal member. 前記第１引出し電極部の外周面と、前記ケースの内周面との間に、金属箔が介在していることを特徴とする請求項１〜３の何れかに記載の電気二重層コンデンサ。   The electric double layer capacitor according to any one of claims 1 to 3, wherein a metal foil is interposed between an outer peripheral surface of the first lead electrode portion and an inner peripheral surface of the case. 陽極箔および陰極箔の一方の幅方向一端部に第１引出し電極部を形成し、前記陽極箔と前記陰極箔とをセパレータを介して巻回して、コンデンサ素子を形成する工程と、
前記コンデンサ素子に電解液を含浸させた後、少なくとも前記第１引出し電極部に相当する領域が導電性材料で形成されている有底筒状のケースに前記コンデンサ素子を挿入する工程と、
前記第１引出し電極部と前記ケースとを、前記ケースの外側から環状に絞り加工して、前記第１引出し電極部と前記ケースとを電気的に接続すると同時に、前記コンデンサ素子を前記ケースに固定する工程とを含むことを特徴とする電気二重層コンデンサの製造方法。
Forming a first extraction electrode portion at one widthwise one end of the anode foil and the cathode foil, winding the anode foil and the cathode foil through a separator, and forming a capacitor element;
Inserting the capacitor element into a bottomed cylindrical case in which at least a region corresponding to the first extraction electrode portion is formed of a conductive material after impregnating the capacitor element with an electrolyte; and
The first extraction electrode portion and the case are drawn into an annular shape from the outside of the case to electrically connect the first extraction electrode portion and the case, and at the same time, fix the capacitor element to the case. And a process for manufacturing the electric double layer capacitor.
JP2009173953A 2009-07-27 2009-07-27 Electric double-layer capacitor and method of manufacturing the same Pending JP2011029425A (en)

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