JP2016189384A - Capacitor and method of manufacturing the same - Google Patents

Capacitor and method of manufacturing the same Download PDF

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JP2016189384A
JP2016189384A JP2015068342A JP2015068342A JP2016189384A JP 2016189384 A JP2016189384 A JP 2016189384A JP 2015068342 A JP2015068342 A JP 2015068342A JP 2015068342 A JP2015068342 A JP 2015068342A JP 2016189384 A JP2016189384 A JP 2016189384A
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electrode foil
lead terminal
lead
cold
capacitor
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航太 福島
Kota Fukushima
航太 福島
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Nippon Chemi Con Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/13Energy storage using capacitors

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Abstract

PROBLEM TO BE SOLVED: To enhance connection reliability by suppressing the reduction of contact strength of a connection portion between a lead-out terminal and an electrode foil, with regard to connection by a cold pressure-welding connection method.SOLUTION: There is provided a method of manufacturing a capacitor which is characterized in that the side surface side in the longitudinal direction of a lead-out terminal (2) is restrained, an electrode foil (4) is overlapped on the lead-out terminal installed in a first restraint part (20) which opens an outer lead (10) side of the lead-out terminal (an opening 24), and a connection part (cold pressure-welding part 14) between the lead-out terminal and the electric foil is formed by a cold pressure-welding connection method, then the external lead side is sheared.SELECTED DRAWING: Figure 1

Description

本発明は、電解コンデンサ、電気二重層コンデンサなどのコンデンサに関し、たとえば、コンデンサ素子の電極箔と引出し端子の接続に冷間圧接(コールドウエルド)法を用いたコンデンサおよびその製造方法に関する。   The present invention relates to a capacitor such as an electrolytic capacitor and an electric double layer capacitor. For example, the present invention relates to a capacitor using a cold welding method for connecting an electrode foil and a lead terminal of a capacitor element, and a method for manufacturing the same.

コンデンサ素子は、陽極側および陰極側の電極箔の間にセパレータを重ねて巻回した後、電解液を含浸させ、または、電極箔とセパレータを交互に積層した後、電解液を含浸させている。これらの電極箔には引出し端子(タブ)が接続され、この引出し端子と電極箔との接続に冷間圧接が用いられる。冷間圧接は、重ね合わせた部材間を非加熱状態で圧接する方法である。   The capacitor element is impregnated with an electrolytic solution after the separator is overlapped and wound between the electrode foil on the anode side and the cathode side, or is impregnated with the electrolytic solution after alternately laminating the electrode foil and the separator. . These electrode foils are connected to lead terminals (tabs), and cold welding is used to connect the lead terminals to the electrode foil. Cold pressure welding is a method of pressure welding the stacked members in a non-heated state.

このような冷間圧接による電極箔と引出し端子との接続に関し、せん断面を形成した冷間圧接チップを引出し端子と電極箔に押し付けることで、引出し端子と電極部の一部をせん断するものがある(例えば、特許文献1、特許文献2)。   With regard to the connection between the electrode foil and the lead terminal by such cold pressure welding, there is one that shears a part of the lead terminal and the electrode part by pressing the cold pressure welding tip having a sheared surface against the lead terminal and the electrode foil. There are (for example, Patent Document 1 and Patent Document 2).

特開2007−273645号公報JP 2007-273645 A 特開2007−103528号公報JP 2007-103528 A

ところで、電子機器の小型化、軽量化、電子部品の高集積化などに対応するために、コンデンサは、小型化や低背化させる必要がある。このようなコンデンサでは、電極箔や引出し端子が縮小化され、これらの接続も細密化している。さらにコンデンサには、高容量化が求められており、容量増加の手段として、電極箔の表面積の拡大などを行っている。そのため、高密度な拡面化処理が施されて電極箔の機械的強度が低下するおそれがある。引出し端子と電極箔との接続では、接続強度の向上や加工性などから冷間圧接法が用いられている。   By the way, in order to cope with downsizing, weight reduction, and high integration of electronic components, it is necessary to reduce the size and height of the capacitor. In such a capacitor, the electrode foil and the lead terminal are reduced in size, and these connections are also made finer. Further, the capacitor is required to have a high capacity, and as a means for increasing the capacity, the surface area of the electrode foil is increased. Therefore, a high-density surface enlargement process may be performed and the mechanical strength of electrode foil may fall. In the connection between the lead terminal and the electrode foil, a cold welding method is used from the viewpoint of improving connection strength and workability.

冷間圧接を行う場合、押圧によって引出し端子の一部が延伸して流動すると、その端子部分との接続部分やその近傍の電極箔の一部が引張られ、接続部分やその近傍の電極箔が局所的に薄くなる。電極箔が薄くなった部分には、リード線に振動が加わった場合に応力が集中し、その力が引出し端子との接続部分に影響するおそれがある。その結果、コンデンサは、接続強度の低下や、電極箔にひび割れの発生などのおそれがある。コンデンサの製造では、押圧により引出し端子が変形するのを抑えるため、たとえば引出し端子の電極箔との接続部である偏平部の周囲に拘束治具を設置する場合がある。しかし、引出し端子には、たとえばリード線などが形成されるため、このリード線部分を回避するように拘束治具が形成される。このような拘束治具によって周囲を拘束された引出し端子は、冷間圧接工程で押圧されて金属流動が生じると、拘束治具の形状に応じて変形するために、変形量が均等にならない。すなわち、拘束治具が設置される偏平部は、リード線が形成されている面は拘束されていないため、リード線方向に大きく延伸し、それに伴って電極箔に対する引張り力も大きくなる。このような電極箔に対して部分的に大きな引張り力が作用すると、引出し端子と電極箔の接続部の状態に影響を与えるおそれがある。特に、小型化に対応するために引出し端子が縮小すると、その現象は顕著に現れる。このような冷間圧接時の引出し端子の伸び(金属流動)は引出し端子の押圧部分の周囲の金属材料の量に影響する。引出し端子が小さいと、押圧部分の周囲の金属材料が少ないので、その分だけ電極材料の抵抗が小さくなり、押圧時に加えられた押圧力に対し、反発力が低下する。このため、押圧力は、引出し端子の拘束されていないリード線方向に拡散し、引出し端子をリード線方向への広がりを生じさせる。   When performing cold pressure welding, if a part of the lead terminal is stretched and flows by pressing, the connection part with the terminal part and a part of the electrode foil in the vicinity thereof are pulled, and the connection part and the electrode foil in the vicinity thereof are pulled. Thin locally. When the lead wire is vibrated, stress concentrates on the thinned portion of the electrode foil, and the force may affect the connection portion with the lead terminal. As a result, the capacitor may cause a decrease in connection strength or cracks in the electrode foil. In the manufacture of a capacitor, in order to suppress deformation of the extraction terminal due to pressing, for example, a restraining jig may be provided around a flat portion that is a connection portion between the extraction terminal and the electrode foil. However, since a lead wire or the like is formed on the lead terminal, for example, a restraining jig is formed so as to avoid this lead wire portion. When the lead terminal whose periphery is restrained by such a restraining jig is pressed in the cold pressure welding process to cause metal flow, the lead terminal is deformed according to the shape of the restraining jig, so that the deformation amount is not uniform. That is, since the flat part where the restraining jig is installed is not restrained on the surface on which the lead wire is formed, the flat part is greatly stretched in the lead wire direction, and the tensile force against the electrode foil is increased accordingly. If a large tensile force is partially applied to such an electrode foil, the state of the connection portion between the lead terminal and the electrode foil may be affected. In particular, when the lead-out terminal is reduced in order to cope with the miniaturization, the phenomenon appears remarkably. The elongation (metal flow) of the lead terminal during such cold welding affects the amount of metal material around the pressed portion of the lead terminal. If the lead terminal is small, the metal material around the pressing portion is small, so that the resistance of the electrode material decreases accordingly, and the repulsive force decreases with respect to the pressing force applied during pressing. For this reason, the pressing force diffuses in the lead wire direction where the lead terminal is not constrained, causing the lead terminal to expand in the lead wire direction.

そこで本発明は、斯かる課題に鑑み、冷間圧接法による接続に関し、引出し端子と電極箔との接続部分の接続強度の低下を抑制し、接続の信頼性を高めることにある。
Therefore, in view of such a problem, the present invention relates to a connection by a cold welding method, and suppresses a decrease in connection strength of a connection portion between the lead terminal and the electrode foil, and improves connection reliability.

上記目的を達成するため、本発明のコンデンサの製造方法の一側面は、引出し端子の長手方向の側面側を拘束するとともに、引出し端子の外部リード側を開放する第1の拘束治具に設置した該引出し端子に電極箔を重ね、冷間圧接法により前記引出し端子と前記電極箔との接続部を形成するとともに、冷間圧接金型に備える剪断部で接続部の前記外部リード側に開放部を形成する、ことを特徴とする。   In order to achieve the above object, one aspect of the capacitor manufacturing method of the present invention is installed in a first restraining jig that restrains the side surface in the longitudinal direction of the lead terminal and opens the external lead side of the lead terminal. The electrode foil is overlaid on the extraction terminal, and a connection portion between the extraction terminal and the electrode foil is formed by a cold pressure welding method, and an open portion is formed on the external lead side of the connection portion by a shearing portion provided in the cold pressure bonding mold. Is formed.

上記コンデンサの製造方法において、より好ましくは、前記開放部と反対側で、かつ、電極箔の縁部に近い外周部に前記冷間圧接金型の一部に形成された剪断部によって、開放部を形成する工程を含む。   In the method of manufacturing a capacitor, more preferably, the open portion is formed by a shearing portion formed in a part of the cold pressure welding mold on the outer peripheral portion on the side opposite to the open portion and near the edge of the electrode foil. Forming a step.

上記コンデンサの製造方法において、より好ましくは、前記引出し端子に重ねた前記電極箔の上側に、前記第1の拘束治具と組み合わせて前記引出し端子および前記電極箔を拘束する第2の拘束治具を設置する工程を含む。   In the method of manufacturing a capacitor, more preferably, a second restraining jig for restraining the lead terminal and the electrode foil in combination with the first restraining jig on the upper side of the electrode foil superimposed on the lead terminal. Including the step of installing

上記目的を達成するため、本発明のコンデンサの一側面は、外部リードを有する引出し端子と電極箔とを冷間圧接により接続させたコンデンサであって、該引出し端子の長手方向の側面側を拘束する拘束治具に固定された前記引出し端子と前記電極箔とが重なる部分を冷間圧接金型で押圧して形成された接続部と、前記接続部の外部リード側に、前記冷間圧接金型の剪断部との接触面に沿って前記電極箔が剪断された開放部とを備えることを特徴とする。   In order to achieve the above object, one aspect of the capacitor of the present invention is a capacitor in which a lead terminal having an external lead and an electrode foil are connected by cold welding, and the side face in the longitudinal direction of the lead terminal is constrained. A connection part formed by pressing a portion where the lead terminal fixed to the restraining jig and the electrode foil overlap with a cold pressure welding mold, and the cold pressure welding metal on the external lead side of the connection part The electrode foil includes an open portion where the electrode foil is sheared along a contact surface with the shearing portion of the mold.

上記コンデンサにおいて、より好ましくは、前記電極箔は、幅方向に対して最も側面側に対向して複数の前記開放部が形成される。
In the above capacitor, more preferably, the electrode foil is formed with a plurality of the open portions so as to face the side surface most in the width direction.

本発明によれば、次のいずれかの効果が得られる。   According to the present invention, any of the following effects can be obtained.

(1) 拘束治具の開口側に応じて電極箔に開放部を形成することで、引出し端子の延伸に電極箔の一部が追従した場合でも、その延伸方向に作用する力が開放部で遮断されるので、引出し端子との接続部に引張力を作用させず、その接続強度の低下を防止する。   (1) By forming an open part in the electrode foil according to the opening side of the restraining jig, even if a part of the electrode foil follows the extension of the lead terminal, the force acting in the extension direction is Since it is interrupted | blocked, a tensile force is not made to act on a connection part with an extraction | drawer terminal, and the fall of the connection strength is prevented.

(2) 電極箔の伸びを防止でき、引出し端子との接続強度を低下させないので、信頼性の高いコンデンサを製造することができる。
(2) Since the electrode foil can be prevented from stretching and the connection strength with the lead terminal is not lowered, a highly reliable capacitor can be manufactured.

第1の実施の形態に係るコンデンサの引出し端子と電極箔の接続状態例を示す図である。It is a figure which shows the example of a connection state of the extraction terminal of the capacitor | condenser which concerns on 1st Embodiment, and electrode foil. 引出し端子を拘束治具に設置する状態を示す図である。It is a figure which shows the state which installs a drawer terminal in a restraining jig. 冷間圧接金型の一例を示す図である。It is a figure which shows an example of a cold pressure welding metal mold | die. コンデンサの製造工程を段階的に示した図である。It is the figure which showed the manufacturing process of the capacitor | condenser in steps. 第2の実施の形態に斯かるコンデンサの引出し端子と電極箔の接続状態例を示す図である。It is a figure which shows the example of a connection state of the lead-out terminal of the capacitor | condenser and electrode foil concerning 2nd Embodiment. 冷間圧接金型の一例を示す図である。It is a figure which shows an example of a cold pressure welding metal mold | die.

〔第1の実施の形態〕   [First Embodiment]

図1は、本発明の第1の実施の形態に係るコンデンサの引出し端子と電極箔の接続状態例を示している。図1に示す構成は一例であり、斯かる構成に本発明が限定されるものではない。   FIG. 1 shows an example of the connection state between the lead terminal of the capacitor and the electrode foil according to the first embodiment of the present invention. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.

<電極箔と引出し端子の接続部分について>   <Connection between electrode foil and lead terminal>

引出し端子2には電極箔4が重ねられて冷間圧接法の圧接接続により接続されている。引出し端子2は、電極箔4を用いるコンデンサ素子たとえば、素子端面から引き出される端子リードの一例である。   An electrode foil 4 is overlaid on the lead-out terminal 2 and connected by a pressure welding connection of a cold pressure welding method. The lead terminal 2 is an example of a capacitor element using the electrode foil 4, for example, a terminal lead drawn from the end face of the element.

この引出し端子2には図1Aに示すように、柱状の支持部6が設けられ、この支持部6の一端側に内部リードとして偏平部8が設けられている。また支持部6の他端側には、図示しない基板などに形成された回路などに対してコンデンサ素子を電気的に接続するための外部リード10が形成されている。偏平部8は、電極箔4に接続させるために形成されており、たとえば加圧成形して形成される。外部リード10側の支持部6および偏平部8は電極箔4と同様の電極金属たとえば、アルミニウムで形成される。外部リード10は支持部6に溶接などにより接続され、たとえば、半田付け可能な金属ワイヤで構成される。   As shown in FIG. 1A, the lead terminal 2 is provided with a columnar support portion 6, and a flat portion 8 is provided as an internal lead on one end side of the support portion 6. An external lead 10 for electrically connecting the capacitor element to a circuit formed on a substrate (not shown) or the like is formed on the other end side of the support portion 6. The flat part 8 is formed in order to be connected to the electrode foil 4, and is formed by pressure molding, for example. The support portion 6 and the flat portion 8 on the external lead 10 side are formed of the same electrode metal as that of the electrode foil 4, for example, aluminum. The external lead 10 is connected to the support portion 6 by welding or the like, and is made of, for example, a solderable metal wire.

陽極側の電極箔4は、たとえばアルミニウム箔にエッチングによる拡面化処理を経て化成処理を施し、表面に誘電体酸化皮膜が形成されている。陰極側の電極箔4は、たとえばアルミニウム箔にエッチングによる拡面化処理が施されており、必要に応じて化成処理によって誘電体酸化皮膜が形成されたものが使用される。   The electrode foil 4 on the anode side is subjected to chemical conversion treatment, for example, by subjecting an aluminum foil to surface enlargement treatment by etching, and a dielectric oxide film is formed on the surface. As the cathode-side electrode foil 4, for example, an aluminum foil is subjected to a surface enlargement process by etching, and a dielectric oxide film is formed by a chemical conversion process if necessary.

コンデンサ素子は、引出し端子2の偏平部8と電極箔4とが重なるように配置している。偏平部8の長さW1は、たとえば、電極箔4の幅W2以上の大きさ(W1≧W2)で形成される。電極箔4の幅W2は、たとえばコンデンサおよびコンデンサ素子を低背化するために、狭く形成されている。また、偏平部8は、たとえば一端側を電極箔4の内側に配置させることで、電極箔4と重ねている。   The capacitor element is arranged so that the flat portion 8 of the lead terminal 2 and the electrode foil 4 overlap. The length W1 of the flat portion 8 is formed with a size (W1 ≧ W2) that is equal to or greater than the width W2 of the electrode foil 4, for example. The width W2 of the electrode foil 4 is narrowly formed, for example, in order to reduce the height of the capacitor and the capacitor element. Moreover, the flat part 8 has overlapped with the electrode foil 4 by arrange | positioning one end side inside the electrode foil 4, for example.

この実施の形態の引出し端子2と電極箔4は、たとえば冷間圧接金型30(図3)を電極箔4側から押圧させることで、偏平部8に凹部12を形成し、この凹部12の少なくとも一部に電極箔4と偏平部8とが圧接接続する冷間圧接部14が形成される。この冷間圧接部14は、引出し端子2と電極箔4とを接続する本発明の接続部の一例である。冷間圧接部14は、電極箔4のW2の内側で電極箔4と偏平部8とが重なる部位に設定されている。   The lead-out terminal 2 and the electrode foil 4 of this embodiment form a recess 12 in the flat portion 8 by, for example, pressing a cold pressure welding die 30 (FIG. 3) from the electrode foil 4 side. A cold pressure contact portion 14 is formed at least partially in which the electrode foil 4 and the flat portion 8 are pressure connected. The cold pressure contact portion 14 is an example of the connection portion of the present invention for connecting the lead terminal 2 and the electrode foil 4. The cold pressure contact portion 14 is set at a portion where the electrode foil 4 and the flat portion 8 overlap each other inside W2 of the electrode foil 4.

この冷間圧接による接続処理では、引出し端子2の偏平部8を拘束治具20に設置して行う。この拘束治具20は、たとえば偏平部8の長辺側の側面と、外部リード10が形成されていない端面側を含む偏平部8の周囲を覆って保持する保持部22を形成している。また拘束治具20には、引出し端子2の支持部6、外部リード10を通過させ、保持部22外に配置させる開口部24が形成されている。   In the connection processing by the cold pressure welding, the flat portion 8 of the lead terminal 2 is installed on the restraining jig 20. The restraining jig 20 forms, for example, a holding portion 22 that covers and holds the periphery of the flat portion 8 including the side surface on the long side of the flat portion 8 and the end surface side where the external leads 10 are not formed. In addition, the restraining jig 20 is formed with an opening 24 through which the support portion 6 of the lead terminal 2 and the external lead 10 are passed and disposed outside the holding portion 22.

<凹部12の構成について>   <About the structure of the recessed part 12>

冷間圧接された電極箔4の凹部12には、少なくとも箔幅方向について、引出し端子2の支持部6や外部リード10の配置側の端面を一定の長さで切断した開放部16−Iが形成される。開放部16−Iは、図1Bに示すように、電極箔4の面上において、凹部12側の端面と偏平部8に載置される部分との間を遮断することで、冷間圧接工程において、押圧時に電極箔4に作用する力を解放させる、所謂スリット(Slit)となる。開放部16−Iは、凹部12の幅と同等の長さで形成される。   In the recessed portion 12 of the electrode foil 4 that has been cold-welded, there is an open portion 16-I obtained by cutting the support portion 6 of the lead terminal 2 or the end face of the external lead 10 at a certain length in at least the foil width direction. It is formed. As shown in FIG. 1B, the open portion 16-I blocks the gap between the end surface on the concave portion 12 side and the portion placed on the flat portion 8 on the surface of the electrode foil 4. In FIG. 2, a so-called slit that releases the force acting on the electrode foil 4 when pressed is formed. The opening 16 -I is formed with a length equivalent to the width of the recess 12.

また冷間圧接された電極箔4の凹部12には、引出し端子2の支持部6や外部リード10が配置されていない端面を一定の長さで切断した開放部16−IIが形成される。この開放部16−IIは、開放部16−Iが形成された端面と対向側の端面側であり、たとえば開放部16−Iに対して平行に形成されればよい。開放部16−IIは、たとえば凹部12側の端面と偏平部8に載置される部分との間を遮断することで、冷間圧接処理における電極箔4に負荷される力を開放し、冷間圧接部14と電極箔4の端面との距離を一定に保持させる。   In addition, in the recessed portion 12 of the electrode foil 4 that has been cold-welded, an open portion 16-II is formed by cutting an end surface on which the support portion 6 of the lead terminal 2 or the external lead 10 is not disposed at a certain length. This open part 16-II is an end face side opposite to the end face on which the open part 16-I is formed. For example, the open part 16-II may be formed parallel to the open part 16-I. The open part 16-II releases the force applied to the electrode foil 4 in the cold welding process by blocking between the end face on the concave part 12 side and the part placed on the flat part 8, for example. The distance between the intermediate pressure contact portion 14 and the end surface of the electrode foil 4 is kept constant.

なお、コンデンサは、開放部16−Iのみを形成すればよく、開放部16−IIを形成しなくてもよい。   Note that the capacitor only needs to form the open portion 16-I, and does not need to form the open portion 16-II.

<拘束治具20について>   <About the restraining jig 20>

図2は、引出し端子を拘束治具に設置する状態例を示している。   FIG. 2 shows a state example in which the drawer terminal is installed on the restraining jig.

拘束治具20は、本発明の第1の拘束治具の一例であり、たとえば図2に示すように、引出し端子2の偏平部8を載置させる載置部21や、偏平部8の側面側を覆うように立壁された3辺の側壁部26によって保持部22を形成している。また保持部22の一辺側には、既述のように、引出し端子2の支持部6および外部リード10を保持部22から突出させて開放する開口部24を備える。この拘束治具20は、引出し端子2を配置させる上面側が開放されており、載置部21と側壁部26によって断面が凹形状となっている。   The restraining jig 20 is an example of the first restraining jig according to the present invention. For example, as shown in FIG. 2, the placement portion 21 on which the flat portion 8 of the lead terminal 2 is placed and the side surface of the flat portion 8. The holding part 22 is formed by the side wall part 26 of the three sides that stand up so as to cover the side. In addition, as described above, the holding portion 22 includes an opening 24 that protrudes from the holding portion 22 and opens the support portion 6 of the lead terminal 2 and the external lead 10 as described above. The restraining jig 20 is open on the upper surface side on which the lead terminal 2 is arranged, and has a concave section due to the mounting portion 21 and the side wall portion 26.

拘束治具20は、たとえば鋼材で形成されている。載置部21の内幅W3は、引出し端子2の偏平部8を拘束するに必要な幅であり、偏平部8の幅W1と同等に設定されている。側壁部26の載置部21の上面からの高さHは、引出し端子2の偏平部8の厚さdと同一高さ(H=d)に設定されればよく、またはそれよりも大きく(H>d)してもよい。また保持部22の横幅L2は、偏平部8の横幅L1と同等、またはそれよりも大きく(L2≧L1)設定して収納可能な大きさとなっている。   The restraining jig 20 is made of, for example, a steel material. The inner width W3 of the mounting portion 21 is a width necessary for restraining the flat portion 8 of the lead terminal 2, and is set to be equal to the width W1 of the flat portion 8. The height H of the side wall portion 26 from the upper surface of the mounting portion 21 may be set to the same height (H = d) as the thickness d of the flat portion 8 of the lead terminal 2 or larger ( H> d). The horizontal width L2 of the holding portion 22 is set to be equal to or larger than the horizontal width L1 of the flat portion 8 (L2 ≧ L1) and can be stored.

これにより、拘束治具20は、冷間圧接される偏平部8に対し、押圧による横幅(L1)方向への伸びを防止できる。この偏平部8の伸び防止により、偏平部8の伸びに追従して電極箔4が伸びて薄化することを防止でき、圧接接続に伴う電極箔4の脆弱化の防止が期待できる。したがって、電極箔4と引出し端子2の偏平部8との接続強度を高めることができる。また開口部24により、引出し端子2の全体長さなどに関わらず、用いることができる。   Thereby, the restraining jig | tool 20 can prevent the expansion | extension to the horizontal width (L1) direction by press with respect to the flat part 8 cold-welded. By preventing the flat portion 8 from being stretched, it is possible to prevent the electrode foil 4 from extending and thinning following the flat portion 8 and to prevent the electrode foil 4 from being weakened due to the press contact connection. Therefore, the connection strength between the electrode foil 4 and the flat portion 8 of the lead terminal 2 can be increased. Further, the opening 24 can be used regardless of the overall length of the extraction terminal 2 or the like.

<冷間圧接金型について>   <Cold welding die>

図3は、冷間圧接金型の一例を示している。   FIG. 3 shows an example of a cold pressure die.

冷間圧接金型30は、引出し端子2に載置された電極箔4上に押し当てて押圧する手段の一例であり、たとえば押圧対象物に接触させる押圧面32、その両端側に側面部34を備える。冷間圧接金型30は、たとえば押圧面32の表面を曲面状に形成し、側面部34を平面状であって、押圧面32との交点を直交またはそれに近い角度で形成しており、所謂蒲鉾形(Semicylindrical)となっている。   The cold pressure welding die 30 is an example of a means for pressing against the electrode foil 4 placed on the lead terminal 2 and pressing, for example, a pressing surface 32 to be brought into contact with an object to be pressed, and side portions 34 at both ends thereof. Is provided. The cold pressure welding die 30 has, for example, the surface of the pressing surface 32 formed in a curved surface, the side surface portion 34 is formed in a flat shape, and the intersection with the pressing surface 32 is formed at an angle that is orthogonal or close thereto, so-called It is a semicylindrical.

押圧面32は、たとえば曲面状の頂点部分周辺による押圧により、偏平部8と電極箔4との冷間圧接部14を形成し、その周縁の曲面によって凹部12を形成する。また側面部34は、本発明の剪断部の一例であり、平面形状および押圧面32に対する角度により剪断刃として機能し、冷間圧接時に接触した電極箔4を剪断して、電極箔4の一部に開放部16−I、16−IIを形成する。   The pressing surface 32 forms, for example, a cold pressure contact portion 14 between the flat portion 8 and the electrode foil 4 by pressing around the curved apex portion, and the concave portion 12 is formed by the curved surface of the periphery thereof. The side surface portion 34 is an example of the shearing portion of the present invention. The side surface portion 34 functions as a shearing blade depending on the planar shape and the angle with respect to the pressing surface 32. Opening portions 16-I and 16-II are formed in the portion.

曲面状の押圧面32で電極箔4を押圧するので、押圧面32から電極箔4に加わる応力が押圧面32から放射状に作用し、均等な応力となり、応力集中を回避できる。つまり、押圧面32では、角部がないので、角部のある冷間圧接金型で押圧した場合に角部に生じる応力集中はない。押圧面32により冷間圧接金型30からの応力が特定の一か所に集中することを防止できる。このため、電極箔4が脆弱化していても、局所的な応力の集中がないため、応力集中による亀裂発生を防止できる。   Since the electrode foil 4 is pressed by the curved pressing surface 32, the stress applied to the electrode foil 4 from the pressing surface 32 acts radially from the pressing surface 32 and becomes uniform stress, thereby avoiding stress concentration. That is, since there is no corner portion on the pressing surface 32, there is no stress concentration generated in the corner portion when pressed by a cold pressure welding die having a corner portion. The pressing surface 32 can prevent the stress from the cold welding die 30 from concentrating on a specific location. For this reason, even if the electrode foil 4 is weakened, since there is no local concentration of stress, cracks due to stress concentration can be prevented.

なお、冷間圧接金型30は、たとえば押圧面32の両端側に、剪断刃として機能する側面部34を備える場合に限られず、少なくともいずれか一辺側に剪断刃としての機能を備えればよい。この場合、冷間圧接工程では、剪断刃としての機能を備えた側面部34を拘束治具20に形成された開口部24側に配置させる。これにより電極箔4の凹部12には、外部リード10が配置された方向の端面に開放部16−Iを形成することができる。   The cold pressure welding die 30 is not limited to the case where the side surfaces 34 functioning as shearing blades are provided on both end sides of the pressing surface 32, for example, and it is sufficient that at least any one side has a function as a shearing blade. . In this case, in the cold pressure welding process, the side surface portion 34 having a function as a shearing blade is disposed on the opening 24 side formed in the restraining jig 20. As a result, an open portion 16 -I can be formed in the recess 12 of the electrode foil 4 on the end surface in the direction in which the external lead 10 is disposed.

<コンデンサの製造工程>   <Capacitor manufacturing process>

図4は、コンデンサの製造工程を段階的に示している。   FIG. 4 shows the capacitor manufacturing process step by step.

この図4に示すコンデンサの製造工程は、本発明のコンデンサの製造方法の一例であり、拘束治具20を引出し端子2に設置する工程やこの引出し端子2に電極箔4を載置する工程(図4A)、冷間圧接金型30による冷間圧接による押圧工程(図4B)を含む。   The capacitor manufacturing process shown in FIG. 4 is an example of the capacitor manufacturing method of the present invention. The process of installing the restraining jig 20 on the extraction terminal 2 and the process of placing the electrode foil 4 on the extraction terminal 2 ( FIG. 4A) includes a pressing step (FIG. 4B) by cold pressing with the cold pressing mold 30.

(1) 拘束治具の設置工程   (1) Restraint jig installation process

引出し端子2は、たとえば図4Aに示すように、拘束治具20の保持部22内に対し、予め設定された位置で拘束される。この設定された位置は、たとえば偏平部8の一部を拘束治具20の側壁部26の一部に接触させてもよく、または載置部21に位置合わせの手段を設けてもよい。拘束治具20と引出し端子2とを決められた位置に配置することで、電極箔4の冷間圧接位置を安定して、コンデンサの製造が行える。   For example, as shown in FIG. 4A, the lead terminal 2 is restrained at a preset position with respect to the holding portion 22 of the restraining jig 20. As for the set position, for example, a part of the flat part 8 may be brought into contact with a part of the side wall part 26 of the restraining jig 20, or a positioning means may be provided on the mounting part 21. By disposing the restraining jig 20 and the lead terminal 2 at predetermined positions, the cold pressing position of the electrode foil 4 can be stabilized and the capacitor can be manufactured.

(2) 電極箔4の設置工程   (2) Installation process of electrode foil 4

拘束治具20に位置決めされた引出し端子2の偏平部8には、この偏平部8の位置に合わせて、または拘束治具20に設定された図示しない位置決め手段などに基づいて、電極箔4が重ねられる。   The flat portion 8 of the lead terminal 2 positioned on the restraining jig 20 is provided with the electrode foil 4 in accordance with the position of the flat portion 8 or based on positioning means (not shown) set on the restraining jig 20. Overlaid.

引出し端子2上に電極箔4が載置されると、この電極箔4の上面側に拘束治具40が設置される。この拘束治具40は、本発明の第2の拘束治具の一例であって、たとえば外形の幅を拘束治具20と同等に形成することで、拘束治具20と組み合わせて、引出し端子2と電極箔4とを上下から拘束する。拘束治具40の平面側の中央部分には、冷間圧接金型30を通過させる貫通孔42を備えており、この貫通孔42によって冷間圧接金型30を左右にずらさずに、設定された位置で押圧することができる。拘束治具40を使用すれば、引出し端子2の拘束治具40方向への変形を防止でき、電極箔4の跳ね上がりや伸びを防止できる。電極箔4の薄化や脆弱化を防止でき、引出し端子2との接続強度をさらに高めることができる。   When the electrode foil 4 is placed on the lead terminal 2, the restraining jig 40 is installed on the upper surface side of the electrode foil 4. This restraining jig 40 is an example of the second restraining jig of the present invention. For example, the constraining jig 20 is combined to form the lead-out terminal 2 by forming the width of the outer shape equal to that of the restraining jig 20. And the electrode foil 4 are restrained from above and below. A central portion on the plane side of the restraining jig 40 is provided with a through hole 42 through which the cold pressure welding die 30 passes, and the cold pressure welding die 30 is set without being shifted left and right by the through hole 42. Can be pressed at different positions. If the restraining jig 40 is used, the lead terminal 2 can be prevented from being deformed in the direction of the restraining jig 40, and the electrode foil 4 can be prevented from jumping up or extending. Thinning and weakening of the electrode foil 4 can be prevented, and the connection strength with the lead terminal 2 can be further increased.

(3) 冷間圧接工程   (3) Cold welding process

冷間圧接工程では、たとえば図4Bに示すように、拘束された電極箔4の上面側に向けて冷間圧接金型30を降下させて電極箔4および偏平部8の一部を押圧する。この押圧により引出し端子2の偏平部8には、凹部12が形成される。偏平部8は、側面部分が各側壁部26によって拘束されており、また上面側が拘束治具40によって拘束されているため、凹部12の形成に応じた力を受けて、拘束治具20の開口部24側に延伸する。   In the cold welding process, for example, as shown in FIG. 4B, the cold welding die 30 is lowered toward the upper surface side of the constrained electrode foil 4 to press a part of the electrode foil 4 and the flat portion 8. By this pressing, a concave portion 12 is formed in the flat portion 8 of the lead terminal 2. Since the flat portion 8 is constrained by the side wall portions 26 and the upper surface side is constrained by the restraining jig 40, the flat portion 8 receives the force according to the formation of the recess 12 and opens the restraining jig 20. It extends to the part 24 side.

電極箔4は、冷間圧接金型30の押圧面32が接触し、さらに押し下げられることで圧縮して引出し端子2の偏平部8に圧接接続する。冷間圧接部14は、圧接により物理的及び電気的に接続している部位をいう。冷間圧接金型30の押圧面32の頂点で圧接された電極箔4は、圧接時の応力により表面の誘電体酸化皮膜が破壊分断され、誘電体酸化皮膜に覆われていない電極箔の基材が現れる。さらに、圧接を続けると、偏平部8と基材が圧接により接続する。絶縁性である誘電体酸化皮膜が除去され、基材と直接した冷間圧接部14は、機械的接続と電気的接続がなされる。一方、冷間圧接部14以外の押圧部分である凹部12では、たとえば電極箔4の誘電体酸化皮膜にひびが入り、そのひびに偏平部8を構成する金属が入り込み、アンカー効果によって機械的接続が達成されている。   The electrode foil 4 is compressed by being brought into contact with the pressing surface 32 of the cold pressing die 30 and further pressed down, and is pressed into the flat portion 8 of the lead terminal 2. The cold pressure contact portion 14 refers to a portion that is physically and electrically connected by pressure welding. The electrode foil 4 press-contacted at the apex of the pressing surface 32 of the cold press-molding die 30 is such that the dielectric oxide film on the surface is broken and broken by the stress at the time of press-contact, and the base of the electrode foil not covered with the dielectric oxide film The material appears. Further, when the press contact is continued, the flat portion 8 and the base material are connected by press contact. The dielectric oxide film which is insulative is removed, and the cold pressure contact portion 14 directly connected to the base material is mechanically and electrically connected. On the other hand, in the concave portion 12 which is a pressing portion other than the cold pressure contact portion 14, for example, a dielectric oxide film of the electrode foil 4 is cracked, and a metal constituting the flat portion 8 enters the crack, and mechanical connection is made by an anchor effect. Has been achieved.

また電極箔4は、側面部34との接触部分が延伸していき、一定量押し下げられると、側面部34と偏平部8に形成される凹部12の一部との間で剪断される。このとき、電極箔4の剪断部分よりも外側の部分は、冷間圧接金型30からの押圧により、電極箔4が剪断されるまでの間、一定量延伸状態となる。拘束治具20の開放部24側に配置された電極箔4の一部は、たとえば接触する偏平部8の延伸に伴って延伸状態となる。   Further, the electrode foil 4 is sheared between the side surface portion 34 and a part of the concave portion 12 formed in the flat portion 8 when the contact portion with the side surface portion 34 extends and is pressed down by a certain amount. At this time, the portion outside the sheared portion of the electrode foil 4 is in a stretched state by a certain amount until the electrode foil 4 is sheared by pressing from the cold pressure welding die 30. A part of the electrode foil 4 arranged on the open part 24 side of the restraining jig 20 is in a stretched state, for example, along with the stretching of the flat part 8 that comes into contact therewith.

冷間圧接工程では、冷間圧接金型30を一定量下降させた後に上昇させて、拘束治具40から引き抜く。押圧から開放されると、電極箔4には、たとえば図4Cに示すように、偏平部8の凹部12の底面側に圧接接続された冷間圧接部14と、その壁面側に剪断された開放部16−I、16−IIが形成される。開放部16−Iは、たとえば開口部24側に流動する偏平部8に追従して延伸する電極箔4の一部からの力を解放し、冷間圧接部14の部分にその引張り力を作用させない。また、開放部16−IIは、冷間圧接部14を最大限確保する手段として有効である。偏平部8の外部リード10が形成されていない端面側は拘束治具20の側壁部26が配置されるため、冷間圧接金型30による押圧工程によって、偏平部8が伸びる影響は少ない。そのため、冷間圧接金型30の側面部34の内、偏平部8の外部リード10が形成されていない端面側に配置される側面部34は押圧面32と同様に曲面状に形成してもよい。しかし、曲面状とすることで、冷間圧接部14の面積が小さくなり、接続強度が低下するおそれがあるが、第1の実施の形態のように、剪断して開放部16−IIとすることで、冷間圧接部14の面積を最大限確保できる。特に、小型化により、接続可能な面積が限られてくる中で、有効な手段となる。   In the cold pressure welding process, the cold pressure welding die 30 is lowered by a certain amount and then lifted and pulled out from the restraining jig 40. When released from the press, for example, as shown in FIG. 4C, the electrode foil 4 has a cold press contact portion 14 press-connected to the bottom surface side of the concave portion 12 of the flat portion 8 and an open sheared to the wall surface side. Portions 16-I and 16-II are formed. The opening 16-I releases, for example, a force from a part of the electrode foil 4 that stretches following the flat part 8 that flows toward the opening 24, and applies the tensile force to the cold-welded part 14. I won't let you. The open portion 16-II is effective as a means for ensuring the cold pressure contact portion 14 as much as possible. Since the side wall portion 26 of the restraining jig 20 is disposed on the end surface side of the flat portion 8 where the external lead 10 is not formed, the flat portion 8 is less affected by the pressing process by the cold pressure welding die 30. Therefore, the side surface portion 34 arranged on the end surface side where the external lead 10 of the flat portion 8 is not formed among the side surface portions 34 of the cold pressure welding die 30 may be formed in a curved surface like the pressing surface 32. Good. However, the curved surface may reduce the area of the cold-welded portion 14 and reduce the connection strength. However, as in the first embodiment, it is sheared to form the open portion 16-II. Thus, the area of the cold pressure contact portion 14 can be secured to the maximum. In particular, it becomes an effective means in the area where the area that can be connected is limited due to downsizing.

斯かる構成によれば、次の効果が期待できる。   According to such a configuration, the following effects can be expected.

(1) 拘束治具20の開口部24に応じて電極箔4に開放部16−Iを形成することで、引出し端子2の延伸に電極箔4の一部が追従した場合でも、その延伸方向に作用する力が開放部16−Iで遮断されるので、電極箔4の引出し端子2との冷間圧接部14に引張力を作用させず、電極箔に割れの原因となるひびや、極端に薄くなる部分が発生せず、その接続強度の低下を防止する。   (1) Even when a part of the electrode foil 4 follows the extension of the lead terminal 2 by forming the opening 16-I in the electrode foil 4 according to the opening 24 of the restraining jig 20, the extension direction thereof Since the force acting on the electrode foil 4 is interrupted by the open portion 16-I, the tensile force is not applied to the cold press contact portion 14 of the electrode foil 4 with the lead terminal 2, and cracks that cause cracks in the electrode foil or extreme Therefore, the thinned portion does not occur and the connection strength is prevented from being lowered.

(2) 冷間圧接部14の接続強度が維持されることで、コンデンサは、たとえば外部リード10側からの振動や外力に対する耐久性が維持でき、強固かつ信頼性の高い製品を製造することができる。   (2) By maintaining the connection strength of the cold welding portion 14, the capacitor can maintain durability against vibrations and external forces from the external lead 10 side, for example, and a strong and reliable product can be manufactured. it can.

(3) 開放部16−IIを形成することで、機械的接続部と電気的接続部を担う冷間圧接部14を最大限確保でき、小型化によって接続可能領域が縮小されても、接続強度を維持できる。   (3) By forming the open portion 16-II, it is possible to secure the cold-welded portion 14 that bears the mechanical connection portion and the electrical connection portion as much as possible, and even if the connectable area is reduced by downsizing, the connection strength Can be maintained.

(4)電極箔4の伸び、脆弱化を防止でき、引出し端子2との接続強度を低下させないので、信頼性の高いコンデンサを製造することができる。   (4) Since the electrode foil 4 can be prevented from being stretched and weakened and the connection strength with the lead terminal 2 is not lowered, a highly reliable capacitor can be manufactured.

〔第2の実施の形態〕   [Second Embodiment]

図5は第2の実施の形態に係るコンデンサの引出し端子と電極箔の接続状態例を示している。   FIG. 5 shows an example of the connection state between the lead terminal of the capacitor and the electrode foil according to the second embodiment.

この実施の形態では、コンデンサの製造において、電極箔4と引出し端子2とを冷間圧接により接続させるのに際し、複数の冷間圧接部52を形成する場合を示している。このコンデンサでは、たとえば引出し端子2の偏平部8上に、所定間隔で離間した2つの凹部50−I、50−IIが形成され、各凹部50−I、50−IIの中央側の一定の範囲が電極箔4と接続した冷間圧接部52に形成されている。凹部50−IIは、たとえば図5Aに示すように、電極箔4の上面側からみて円形に開口している。これに対し凹部50−Iは、たとえば電極箔4の上面側からみて、その開口部分の半分以上が円形に近い形状に開口され、外部リード10および支持部6側の一部を平面形状にして開口している。この凹部50−Iの平面形状部分は、冷間圧接金型30によって形成される開放部54の一例である。   This embodiment shows a case where a plurality of cold-welded portions 52 are formed when the electrode foil 4 and the extraction terminal 2 are connected by cold-welding in the manufacture of a capacitor. In this capacitor, for example, two concave portions 50-I and 50-II spaced apart by a predetermined interval are formed on the flat portion 8 of the lead terminal 2, and a certain range on the center side of each concave portion 50-I and 50-II. Is formed in the cold pressure contact portion 52 connected to the electrode foil 4. For example, as shown in FIG. 5A, the recess 50-II is opened in a circular shape when viewed from the upper surface side of the electrode foil 4. On the other hand, for example, when viewed from the upper surface side of the electrode foil 4, the recess 50 -I has a shape in which more than half of the opening is opened in a shape close to a circle, and a part on the side of the external lead 10 and the support portion 6 is planar. It is open. The planar portion of the recess 50 -I is an example of the opening 54 formed by the cold pressure welding die 30.

すなわち、この凹部50の平面部分では、図5Cに示すように、電極箔4がこの平面形状にそって剪断される。この開放部54の形成位置は、たとえば凹部50−Iの中心部分から開放部54までの距離L3が冷間圧接部52の半径rよりも大きく(L3≧r)なるように設定している。   That is, in the planar portion of the recess 50, as shown in FIG. 5C, the electrode foil 4 is sheared along this planar shape. The position where the opening 54 is formed is set such that, for example, the distance L3 from the central portion of the recess 50-I to the opening 54 is larger than the radius r of the cold press contact 52 (L3 ≧ r).

また、電極箔4と引出し端子2には、たとえば図5Bに示すように、引出し端子2の長さ方向に対して一列に並べられた2つの凹部50−I、50−IIについて、それぞれ、電極箔4の端面側の一部を切り欠いた形状に形成される。この切り欠き部分は、既述のように、本発明の開放部の一例である。各切り欠き部分では、冷間圧接において電極箔4が押圧されるときに形成され、切り欠き部分に重ねられた電極箔4の一部を剪断した開放部54、56が形成される。剪断による開放部54、56を備えた電極箔4の機能は、既述の通りであり、説明を省略する。   Further, for example, as shown in FIG. 5B, the electrode foil 4 and the extraction terminal 2 are respectively provided with two recesses 50 -I and 50 -II arranged in a line with respect to the length direction of the extraction terminal 2. The foil 4 is formed in a shape in which a part on the end face side is cut out. As described above, this notch is an example of the opening portion of the present invention. In each notch portion, open portions 54 and 56 formed by shearing a part of the electrode foil 4 overlaid on the notch portion are formed when the electrode foil 4 is pressed in cold pressure welding. The function of the electrode foil 4 provided with the open portions 54 and 56 by shearing is as described above, and a description thereof is omitted.

<冷間圧接金型について>   <Cold welding die>

図6は、冷間圧接金型の一例を示している。   FIG. 6 shows an example of a cold pressure die.

冷間圧接金型60は、たとえば図6に示すように、電極箔4に形成する凹部の数に応じた数の金型60A、60Bが用いられる。各金型60A、60Bには、たとえば押圧対象物に接触させる接続面部62、この接続面部62の周囲に形成され、接触させる対象面に対して傾斜方向に直線状、または曲面状の接触面を備える押圧部64を備える。また金型60A、60Bには、側面側の一辺を上面側から接続面部62側に向けて平面状に形成した側面部66を備えている。この側面部66は、たとえば接続面部62や押圧部64との接続交点を直交またはそれに近い角度で形成されており、電極箔4を剪断する。   For example, as shown in FIG. 6, the number of molds 60 </ b> A and 60 </ b> B corresponding to the number of recesses formed in the electrode foil 4 is used as the cold pressure welding mold 60. Each of the molds 60A and 60B has, for example, a connection surface portion 62 that is brought into contact with the object to be pressed, and a contact surface that is formed around the connection surface portion 62 and is linear or curved in the inclination direction with respect to the contact surface. A pressing portion 64 is provided. In addition, the molds 60A and 60B are provided with a side surface portion 66 that is formed in a planar shape with one side surface side facing from the upper surface side to the connection surface portion 62 side. The side surface portion 66 is formed, for example, at a connection intersection with the connection surface portion 62 or the pressing portion 64 at an angle that is orthogonal or close to it, and shears the electrode foil 4.

接続面部62は、金型60A、60Bの各底面側であって、たとえばその接触面の形状が所定の半径をもった曲面と、側面部66側と隣接する部分に直線の一辺が形成される。この金型60A、60Bが電極箔4に対して直交方向またはそれに近い角度で押圧されることで、電極箔4と偏平部8とに所定の圧力を与えて接続させる。   The connection surface portion 62 is on each bottom surface side of the molds 60A and 60B. For example, the contact surface shape has a curved surface with a predetermined radius, and a straight side is formed on a portion adjacent to the side surface portion 66 side. . The molds 60 </ b> A and 60 </ b> B are pressed to the electrode foil 4 in an orthogonal direction or at an angle close to the electrode foil 4, thereby connecting the electrode foil 4 and the flat portion 8 with a predetermined pressure.

押圧部64は、電極箔4および偏平部8に対して、側面部66が接触する部分を除き、図5Bに示すように、接触面が曲面または傾斜面の凹部50−I、50−IIを形成する。   As shown in FIG. 5B, the pressing portion 64 has concave portions 50-I and 50-II whose contact surfaces are curved surfaces or inclined surfaces, except for a portion where the side surface portion 66 contacts the electrode foil 4 and the flat portion 8. Form.

なお、図5Aに示すように、凹部50−IIを形成する場合には、側面部66を備えない、接触面部62が円形断面の冷間圧接金型を用いればよい。   As shown in FIG. 5A, in the case of forming the recess 50-II, a cold pressure welding die having a circular cross section of the contact surface portion 62 without the side surface portion 66 may be used.

<コンデンサの製造工程>   <Capacitor manufacturing process>

このコンデンサの製造工程は、本発明のコンデンサの製造方法の一例であり、既述のように拘束治具20を引出し端子2に設置する工程やこの引出し端子2に電極箔4を載置する工程(図4A)、冷間圧接金型60A、60Bによる押圧工程(図4B)を含む。この製造工程では、既述のコンデンサの製造工程と同様の内容に関する説明を省略する。   This capacitor manufacturing process is an example of the capacitor manufacturing method of the present invention. As described above, the process of installing the restraining jig 20 on the extraction terminal 2 and the process of placing the electrode foil 4 on the extraction terminal 2. (FIG. 4A), including a pressing step (FIG. 4B) using cold pressure welding dies 60 </ b> A and 60 </ b> B. In this manufacturing process, the description about the same content as the capacitor manufacturing process described above is omitted.

(1) 拘束治具の設置工程   (1) Restraint jig installation process

引出し端子2は、たとえば第1の実施の形態と同様の拘束治具20の保持部22内に対し、予め設定された位置で拘束される。拘束治具20と引出し端子2とを決められた位置に配置することで、電極箔4の冷間圧接位置を安定して、コンデンサの製造が行える。   The lead terminal 2 is restrained at a preset position with respect to the holding portion 22 of the restraining jig 20 similar to that of the first embodiment, for example. By disposing the restraining jig 20 and the lead terminal 2 at predetermined positions, the cold pressing position of the electrode foil 4 can be stabilized and the capacitor can be manufactured.

(2) 電極箔4の設置工程   (2) Installation process of electrode foil 4

引出し端子2上に電極箔4が載置されると、この電極箔4の上面側に拘束治具40が設置される。この拘束治具40は、たとえば平面側の中央部分に、冷間圧接金型60A、60Bを通過させる貫通孔42を備えており、この貫通孔によって冷間圧接金型60A、60Bを設定された位置で押圧させることができる。   When the electrode foil 4 is placed on the lead terminal 2, the restraining jig 40 is installed on the upper surface side of the electrode foil 4. The restraining jig 40 includes, for example, a through hole 42 that allows the cold pressure welding molds 60A and 60B to pass through at a central portion on the plane side, and the cold pressure welding molds 60A and 60B are set by the through holes. It can be pressed in position.

(3) 冷間圧接工程   (3) Cold welding process

冷間圧接工程では、拘束された電極箔4の上面側に向けて冷間圧接金型60A、60Bを降下させて電極箔4および偏平部8の一部を押圧する。冷間圧接金型60A、60Bは、同時に降下させてもよく、またはいずれか一方ずつ降下させてもよい。そのほか、冷間圧接金型60A、60Bは、たとえば一体的に形成され、または図示しない連結部品を利用して一体化することで、同時に降下させてもよい。この押圧により引出し端子2の偏平部8には、凹部50−I、50−IIが形成される。偏平部8は、側面部分が各側壁部26によって拘束されており、また上面側が拘束治具40によって拘束されているため、凹部50−I、50−IIの形成に応じた力を受けて、拘束治具20の開口部24側に延伸する。   In the cold pressure welding process, the cold pressure welding molds 60A and 60B are lowered toward the upper surface side of the constrained electrode foil 4, and a part of the electrode foil 4 and the flat portion 8 are pressed. The cold pressure welding dies 60A and 60B may be lowered at the same time or may be lowered one by one. In addition, the cold-welding dies 60A and 60B may be lowered at the same time, for example, integrally formed or integrated by using a connecting part (not shown). By this pressing, concave portions 50-I and 50-II are formed in the flat portion 8 of the lead terminal 2. The flat portion 8 is restrained by the side wall portions 26 by the side wall portions 26 and the upper surface side is restrained by the restraining jig 40, and therefore receives a force according to the formation of the recesses 50-I and 50-II. It extends to the opening 24 side of the restraining jig 20.

電極箔4は、冷間圧接金型60A、60Bの接続面部62および押圧部64が接触し、さらに押し下げられることで圧縮して引出し端子2の偏平部8に圧接接続する。電極箔4は、側面部66との接触部分が延伸していき、一定量押し下げられると、側面部66と偏平部8に形成される凹部50−Iの一部との間で剪断される。側面部66と接続面部62との成す角度θ1は、たとえば直角またはそれに近い角度で形成され、その交点の角部はたとえば剪断刃として機能する。このとき、電極箔4の剪断部分よりも外側の部分は、冷間圧接金型60Aからの押圧により、電極箔4が剪断されるまでの間、一定量延伸状態となる。また、拘束治具20の開口部24側に配置された電極箔4の一部は、たとえば接触する偏平部8の延伸に伴って延伸状態となる。   The electrode foil 4 is compressed by being brought into contact with the connection surface portion 62 and the pressing portion 64 of the cold pressure contact molds 60A and 60B, and is pressed and connected to the flat portion 8 of the lead terminal 2. The electrode foil 4 is sheared between the side surface portion 66 and a part of the recess 50-I formed in the flat portion 8 when the contact portion with the side surface portion 66 extends and is pressed down by a certain amount. The angle θ1 formed by the side surface portion 66 and the connection surface portion 62 is formed at, for example, a right angle or an angle close thereto, and the corner portion at the intersection functions as, for example, a shearing blade. At this time, the portion outside the sheared portion of the electrode foil 4 is in a stretched state by a certain amount until the electrode foil 4 is sheared by pressing from the cold pressure welding die 60A. Moreover, a part of electrode foil 4 arrange | positioned at the opening part 24 side of the restraining jig | tool 20 will be in an extending | stretching state, for example with the extending | stretching of the flat part 8 which contacts.

また接続面部62と押圧部64との成す角度θ2は、たとえば鈍角であって、その角部は曲面に形成される。このように曲面状の接触面にすれば、電極箔4に対する局所的な応力集中を防止でき、均等な圧接応力が得られる。これにより、ひび割れや箔割れを防止できる。   Further, the angle θ2 formed by the connection surface portion 62 and the pressing portion 64 is, for example, an obtuse angle, and the corner portion is formed into a curved surface. If the contact surface is curved in this way, local stress concentration on the electrode foil 4 can be prevented, and uniform pressure stress can be obtained. Thereby, a crack and foil crack can be prevented.

冷間圧接工程では、冷間圧接金型60A、60Bを上昇させて、拘束治具40から引き抜き、押圧が開放されると、電極箔4には、たとえば図5Cに示すように、偏平部8の凹部50−I、50−IIの底面側に圧接接続された冷間圧接部52と、その壁面側に剪断された開放部54、56が形成される。   In the cold pressure welding step, when the cold pressure welding molds 60A and 60B are raised and pulled out of the restraining jig 40 and the pressure is released, the flat portion 8 is formed on the electrode foil 4 as shown in FIG. 5C, for example. The cold press contact portion 52 is press-connected to the bottom surface side of the recesses 50-I and 50-II, and the open portions 54 and 56 are sheared on the wall surface side.

斯かる構成によれば、次のいずれかの効果が期待できる。   According to such a configuration, one of the following effects can be expected.

(1) 外部リード10側に近い電極箔4の凹部50−Iに開放部54を備えることで、冷間圧接時に偏平部8が流動した場合でも、その流動による力を開放部54で遮断して、冷間圧接部52側に伝わらせず、電極箔4と引出し端子2との接続強度を維持できる。   (1) By providing the opening 54 in the recess 50-I of the electrode foil 4 close to the external lead 10 side, even if the flat part 8 flows during cold pressure welding, the force due to the flow is blocked by the opening 54. Thus, the connection strength between the electrode foil 4 and the lead terminal 2 can be maintained without being transmitted to the cold pressure contact portion 52 side.

(2) 偏平部8と電極箔4とが重なる面に対し、複数の凹部50−I、50−IIを形成することで、冷間圧接部52に対して生じる回転応力に対抗でき、接続強度およびコンデンサの信頼性の向上が図れる。   (2) By forming a plurality of recesses 50-I and 50-II on the surface where the flat part 8 and the electrode foil 4 overlap, it is possible to counter the rotational stress generated on the cold-welded part 52, and the connection strength In addition, the reliability of the capacitor can be improved.

(3) 冷間圧接金型60A、60Bによって電極箔4の接続工程時に同時に開放部54、56を形成するので、製造処理の迅速化、簡略化が図れる。   (3) Since the open portions 54 and 56 are simultaneously formed by the cold pressure welding molds 60A and 60B during the connecting process of the electrode foil 4, the manufacturing process can be speeded up and simplified.

(4) 開放部54によって外部リード10側からの外力を遮断でき、冷間圧接部52の接続強度の低下を防止できる。   (4) The external force from the external lead 10 side can be cut off by the opening 54, and the connection strength of the cold press contact 52 can be prevented from being lowered.

〔第3の実施の形態〕   [Third Embodiment]

この実施の形態では、引出し端子2と電極箔4とを冷間圧接する前に、予め偏平部8の設定位置を押圧して凹部50−I、50−IIを形成しておく場合を示している。この製造工程では、引出し端子2のみを拘束治具20、40に設置する。この場合、拘束治具20の保持部22の高さは、たとえば偏平部8の厚さと同等に形成するのが望ましい。これにより、拘束治具20、40を組み合わせた時に、偏平部8に対する保持力を高めることができる。   This embodiment shows a case where the recessed portions 50-I and 50-II are formed by pressing the set position of the flat portion 8 in advance before the lead terminal 2 and the electrode foil 4 are cold-welded. Yes. In this manufacturing process, only the lead terminal 2 is installed on the restraining jigs 20 and 40. In this case, the height of the holding portion 22 of the restraining jig 20 is desirably formed to be equal to the thickness of the flat portion 8, for example. Thereby, when the restraining jigs 20 and 40 are combined, the holding force for the flat portion 8 can be increased.

引出し端子2が拘束治具20、40に保持されると、1回目の押圧工程として、冷間圧接金型60A、60Bをそれぞれ拘束治具40の貫通孔42内に降下させ、偏平部8を押圧する。これにより、偏平部8には、設定された位置に対して凹部50−I、50−IIが形成される。この1回目の押圧工程では、たとえば冷間圧接金型60A、60Bの押圧量を冷間圧接工程として設定された降下量よりも少なくしてもよい。   When the lead-out terminal 2 is held by the restraining jigs 20 and 40, as the first pressing step, the cold pressing dies 60A and 60B are lowered into the through holes 42 of the restraining jig 40, and the flat portion 8 is moved. Press. Thereby, the flat part 8 is formed with recesses 50-I and 50-II with respect to the set position. In this first pressing step, for example, the pressing amount of the cold pressing dies 60A and 60B may be less than the amount of descent set as the cold pressing step.

1回目の押圧が終了すると、電極箔4の設置工程として、拘束治具40を外して、偏平部8の上面側の設定位置に電極箔4を載置させる。そして電極箔4の上面側に拘束治具40を載置させる。   When the first pressing is completed, as a step of installing the electrode foil 4, the restraining jig 40 is removed and the electrode foil 4 is placed at a set position on the upper surface side of the flat portion 8. Then, the restraining jig 40 is placed on the upper surface side of the electrode foil 4.

電極箔4および引出し端子2を拘束すると、2回目の押圧工程として、冷間圧接金型60A、60Bを拘束治具40の貫通孔42を通じて降下させる。電極箔4は、上面側から押圧されることで予め形成された凹部50−I、50−II内に導かれ、接続面部62の表面と凹部50−I、50−IIの表面に沿って変形していき、一定量押し下げられると、一部が偏平部8の表面に圧接状態となる。また電極箔4は、押し下げられる途中で、凹部50−I、50−IIと、変形しない部分との境界と、冷間圧接金型60A、60Bの側面部66との間で剪断される。また、凹部50−I、50−II内の電極箔4は、冷間圧接金型60A、60Bによって押圧されることで偏平部8との接触部分の一部に冷間圧接部52が形成される。   When the electrode foil 4 and the lead terminal 2 are restrained, the cold pressing dies 60A and 60B are lowered through the through holes 42 of the restraining jig 40 as a second pressing step. The electrode foil 4 is guided into the concave portions 50-I and 50-II formed in advance by being pressed from the upper surface side, and is deformed along the surface of the connection surface portion 62 and the surfaces of the concave portions 50-I and 50-II. Then, when a certain amount is pushed down, a part is brought into pressure contact with the surface of the flat portion 8. Further, the electrode foil 4 is sheared between the boundaries between the recesses 50-I and 50-II and the undeformed portions and the side surface portions 66 of the cold pressure dies 60A and 60B while being pressed down. Further, the electrode foil 4 in the recesses 50-I and 50-II is pressed by the cold pressure welding molds 60A and 60B, so that a cold pressure contact portion 52 is formed at a part of the contact portion with the flat portion 8. The

なお、1回目の押圧工程では、冷間圧接に用いる金型60A、60Bを用いる場合に限られず、別途、1回目の押圧専用の金型を用いてもよい。この金型は、たとえば冷間圧接金型60A、60Bよりも押圧面の幅が狭小なものを用いてもよい。これにより、2回目の押圧において、1回目に形成された凹部を深くすることで、電極箔4との接続強度を高めることができる。   Note that the first pressing step is not limited to the case of using the molds 60A and 60B used for cold pressure welding, and a mold dedicated to the first pressing may be separately used. As this mold, for example, a mold having a narrower pressing surface than the cold pressure welding molds 60A and 60B may be used. Thereby, in the second pressing, the connection strength with the electrode foil 4 can be increased by deepening the concave portion formed in the first time.

斯かる構成によれば、既述の効果に加え、さらに以下の効果が期待できる。   According to such a configuration, the following effects can be expected in addition to the effects described above.

(1) 予め引出し端子2の偏平部8を押圧し、凹部50−I、50−IIを形成しておくことで、圧接接続する際に、電極箔4の表面に押圧力が集中でき、より強固な接続状態とすることができる。   (1) By pressing the flat portion 8 of the lead terminal 2 in advance and forming the recesses 50-I and 50-II, the pressing force can be concentrated on the surface of the electrode foil 4 when press-connecting. A strong connection state can be obtained.

(2) 電極箔4を押圧する際に、偏平部8を変形させないまたはその変形量が少なくなることで、電極箔4が偏平部8の変形に伴って追従することを抑制し、変形時に電極箔4の表面の皺の発生を防止する。また、偏平部8の表面状態の影響を受け、接続面が平面にならず、接触面積の低下または電極箔の破損などを回避することができる。   (2) When the electrode foil 4 is pressed, the flat portion 8 is not deformed or the amount of deformation is reduced, so that the electrode foil 4 is prevented from following along with the deformation of the flat portion 8, and the electrode is deformed. Generation of wrinkles on the surface of the foil 4 is prevented. In addition, the connection surface does not become flat due to the influence of the surface state of the flat portion 8, and a reduction in contact area or breakage of the electrode foil can be avoided.

(3) 電極箔4の冷間圧接工程前に、凹部50−I、50−IIの形成状態を確認することができ、偏平部8に対する接触面の状態を安定化することができる。   (3) Before the cold pressing process of the electrode foil 4, the formation state of the recesses 50-I and 50-II can be confirmed, and the state of the contact surface with respect to the flat part 8 can be stabilized.

第3の実施の形態では、第2の実施の形態のように凹部を複数設ける構成を例としたが、第1の実施の形態のように凹部が一つである構成でも同様の効果を得られる。   In the third embodiment, a configuration in which a plurality of recesses are provided as in the second embodiment is taken as an example, but the same effect can be obtained even in a configuration in which there is one recess as in the first embodiment. It is done.

〔実験例〕   [Experimental example]

この実験例では、電極箔4と引出し端子2とを冷間圧接で接続する場合であり、この一方のコンデンサ素子には、電極箔4に対し、従来の円形の冷間圧接金型を2つ用いて冷間圧接している。もう一方のコンデンサ素子では、電極箔4に対し、図5Bに示すように、押圧された凹部50−I、50−IIの一部に開放部54、56を形成している。そして実験では、これら2つのコンデンサ素子について、冷間圧接による接続部の引き?がし強度と、接触抵抗値を比較した。   In this experimental example, the electrode foil 4 and the lead terminal 2 are connected by cold pressure welding, and one capacitor element has two conventional circular cold pressure welding molds for the electrode foil 4. Used for cold welding. In the other capacitor element, as shown in FIG. 5B, open portions 54 and 56 are formed in the pressed recesses 50 -I and 50 -II with respect to the electrode foil 4. And in the experiment, about the connection of these two capacitor elements by cold welding? The peel strength was compared with the contact resistance value.

<引き剥がし強度について>   <About peel strength>

引き?がし強度は、電極箔4の上に引出し端子2を載置している状態で、引出し端子2の外部リード10を電極箔4と反対方向に引っ張り、引出し端子2が電極箔4から剥がれたときの力の大きさによって測定する。接続部に対する引き剥がし強度は、凹部に開放部を備えない従来構造のコンデンサ素子では、約1.9〜2.1(N)が測定された。これに対し、凹部50−I、50−IIに開放部54、56を備えたコンデンサ素子では、約2.1〜2.4(N)の引張強度が測定された。   pull? The peel strength was such that the external terminal 10 of the extraction terminal 2 was pulled in the opposite direction to the electrode foil 4 while the extraction terminal 2 was placed on the electrode foil 4, and the extraction terminal 2 was peeled off from the electrode foil 4. Measure by the magnitude of the force when. The peel strength with respect to the connection portion was measured to be about 1.9 to 2.1 (N) in the capacitor element having the conventional structure in which the concave portion is not provided with the open portion. On the other hand, the tensile strength of about 2.1 to 2.4 (N) was measured in the capacitor element provided with the open portions 54 and 56 in the recesses 50-I and 50-II.

これは、凹部50−I、50−IIに開放部54、56を形成することで、冷間圧接工程において、引出し端子2の変形による金属流動の力が凹部50−I、50−II内に配置される電極箔4に作用するのを阻止し、冷間圧接部52に対する負荷が軽減されたことによる。この実験例によれば、本発明の製造方法によるコンデンサは、引出し端子2に対する接続強度が高められることが示された。   This is because the open portions 54 and 56 are formed in the recesses 50-I and 50-II, so that the metal flow force due to the deformation of the extraction terminal 2 is generated in the recesses 50-I and 50-II in the cold welding process. This is because the load on the cold press contact portion 52 is reduced by preventing the electrode foil 4 from being applied. According to this experimental example, it was shown that the capacitor according to the manufacturing method of the present invention has improved connection strength to the lead terminal 2.

<接触抵抗について>   <Contact resistance>

コンデンサ素子の接触抵抗は、凹部に開放を備えない従来構造のコンデンサ素子では、電気的な負荷を与える前と負荷を与えた後において約1.3〜1.4〔mΩ〕が測定された。また凹部50−I、50−IIに開放部54、56が形成されたコンデンサ素子では、負荷をかける前と負荷をかけた後において、約1.4〜1.5〔mΩ〕となった。この測定値から、コンデンサ素子は、冷間圧接により凹部50−I、50−II内に開放部54、56を形成した場合であっても、接触抵抗が大きく変化せず、コンデンサの等価直列抵抗等の電気特性に大きな影響を与えないことが示された。   As for the contact resistance of the capacitor element, about 1.3 to 1.4 [mΩ] was measured before and after applying the electrical load in the capacitor element having the conventional structure in which the recess is not open. Further, in the capacitor element in which the open portions 54 and 56 are formed in the recesses 50-I and 50-II, the capacitance is about 1.4 to 1.5 [mΩ] before and after the load is applied. From this measured value, the capacitor element does not change greatly even when the open portions 54 and 56 are formed in the recesses 50-I and 50-II by cold welding, and the equivalent series resistance of the capacitor is not changed. It has been shown that there is no significant effect on the electrical characteristics.

〔他の実施の形態〕   [Other Embodiments]

(1) 上記実施の形態では、引出し端子2の偏平部8と電極箔4とを接続させるために形成された凹部50−I、50−IIは、電極箔4および偏平部8の変形部分が重ならない位置に離間して押圧位置が設定されているが、これに限られない。コンデンサ素子は、凹部50−I、50−IIの一部が重なるように近接して押圧位置を設定してもよい。このとき、引出し端子2と電極箔4との冷間圧接部52が2箇所に設定されるために、押圧位置は、冷間圧接金型60A、60Bの押圧面部62の直径よりも広い距離で離間させる。   (1) In the above embodiment, the concave portions 50-I and 50-II formed to connect the flat portion 8 of the lead terminal 2 and the electrode foil 4 have deformed portions of the electrode foil 4 and the flat portion 8 respectively. Although the pressing position is set apart from the position where it does not overlap, it is not limited to this. The capacitor elements may be set close to each other so that the concave portions 50-I and 50-II partially overlap each other. At this time, since the cold pressure contact portions 52 between the lead terminals 2 and the electrode foil 4 are set at two locations, the pressing position is a distance wider than the diameter of the pressure surface portion 62 of the cold pressure welding molds 60A and 60B. Separate.

この実施の形態の凹部50―I、50−IIには、たとえば電極箔4の端面に近い位置にそれぞれ開放部54、56が形成される。冷間圧接工程では、たとえば既述の冷間圧接金型60A、60Bを、時間差を設けて電極箔4に降下させて押圧するほか、接続面部62を所定の間隔で2つ突出させた形状の1つの冷間圧接金型を利用してもよい。2つの接続面部62を突出させた金型を用いる場合、電極箔4には、たとえば2つの冷間圧接部52によって同時に押圧することで、曲面状の凹部50−I、50−IIの間に隆起部が形成される。この隆起部は、押圧時の変形量が少なく、偏平部8の金属流動を抑えることができる。これにより、凹部50―I、50−IIでは、それぞれに形成された開放部54、56に加え、隆起部によって偏平部8の変形による電極箔4への負荷が軽減でき、冷間圧接部52の接続強度が低下するのを防止できる。   In the recesses 50-I and 50-II of this embodiment, for example, open portions 54 and 56 are formed at positions close to the end face of the electrode foil 4, respectively. In the cold pressure welding process, for example, the cold pressure welding molds 60A and 60B described above are lowered and pressed against the electrode foil 4 with a time difference, and two connection surface portions 62 are projected at a predetermined interval. One cold welding die may be used. When using the metal mold | die which protruded the two connection surface parts 62, it presses against the electrode foil 4 simultaneously by the two cold press-contacting parts 52, for example, between curved-surface-shaped recessed part 50-I, 50-II. A raised portion is formed. This raised portion has a small amount of deformation at the time of pressing, and can suppress the metal flow of the flat portion 8. As a result, in the recesses 50-I and 50-II, in addition to the open portions 54 and 56 formed respectively, the load on the electrode foil 4 due to the deformation of the flat portion 8 can be reduced by the raised portions, and the cold press contact portion 52 The connection strength can be prevented from decreasing.

(2) 上記実施の形態では、冷間圧接による凹部を複数形成する場合、引出し端子2の長さ方向に応じて並べて押圧する場合を示したがこれに限られない。引出し端子2の横幅方向に対して、並べて押圧してもよい。すなわち、電極箔4の長辺方向であり、偏平部8の短辺方向に凹部50―I、50−IIを形成してもよい。さらにコンデンサ素子の製造では、凹部50―I、50−IIの一部が重なるように押圧位置を設定してもよい。この凹部50−I、50−IIでは、冷間圧接部52が重ならないように離間して押圧位置を設定すればよい。また電極箔4の長辺側の端面にそれぞれ開放部54、56を形成すればよい。さらに、凹部50―I、50−II間には、それぞれの凹部50−I、50−IIの一部同士が重なる隆起部が形成される。   (2) In the above embodiment, when a plurality of recesses formed by cold pressure welding are formed, the case where they are arranged and pressed in accordance with the length direction of the extraction terminal 2 is shown, but this is not a limitation. You may press in parallel with respect to the width direction of the drawer terminal 2. FIG. That is, the recesses 50 -I and 50 -II may be formed in the long side direction of the electrode foil 4 and in the short side direction of the flat portion 8. Further, in the manufacture of the capacitor element, the pressing position may be set so that the concave portions 50-I and 50-II partially overlap. In the recesses 50-I and 50-II, the pressing positions may be set so as to be separated so that the cold press contact portions 52 do not overlap. Moreover, what is necessary is just to form the open parts 54 and 56 in the end surface of the long side of the electrode foil 4, respectively. Furthermore, a raised portion is formed between the recesses 50-I and 50-II, in which parts of the respective recesses 50-I and 50-II overlap each other.

この隆起部が形成されることで、接続部は、たとえば開放部54、56が形成される方向のみならず、隆起部が形成される方向についても偏平部8の流動による外力の影響を抑えることができる。   By forming the raised portion, the connecting portion suppresses the influence of external force due to the flow of the flat portion 8 not only in the direction in which the open portions 54 and 56 are formed, but also in the direction in which the raised portion is formed. Can do.

(3) 上記実施の形態では、電極箔4と引出し端子2に形成する凹部が1または2つの場合を示したがこれに限られない。冷間圧接工程では、3以上の凹部を形成してもよい。3つの凹部がたとえば引出し端子2に沿って直線的に配置される場合には、電極箔4の幅方向に対して最も外側の1または2箇所に開放部16、54、56を形成し、電極箔4の中央側には開放部を形成しなくてもよい。   (3) In the above embodiment, the case where one or two recesses are formed in the electrode foil 4 and the lead terminal 2 is shown, but the present invention is not limited to this. In the cold welding process, three or more recesses may be formed. When three concave portions are arranged linearly along the lead terminal 2, for example, the open portions 16, 54, 56 are formed at one or two locations on the outermost side in the width direction of the electrode foil 4, and the electrode It is not necessary to form an opening on the center side of the foil 4.

(4) 上記実施の形態では、電極箔4の凹部に形成する開放部54、56は、電極箔4の長辺側端面または拘束治具20の開口部24に対して平行な直線状に形成される場合を示したが、これに限らない。冷間圧接により形成した凹部が円形である場合、開放部は、たとえば電極箔4の側面側、または拘束治具20の開口部24に近い部分の一部を凹部の円弧面に沿って剪断させてもよい。その他、開放部は、たとえば直線形状に形成される場合に限られず、電極箔4の端面側に対して曲面状にするほか、「V」字状などの形状で形成してもよい。この開放部の形状は、冷間圧接金型の剪断面の形状により設定される。   (4) In the above embodiment, the open portions 54 and 56 formed in the concave portion of the electrode foil 4 are formed in a straight line parallel to the long side end surface of the electrode foil 4 or the opening 24 of the restraining jig 20. However, the present invention is not limited to this. When the concave portion formed by cold welding is circular, the open portion shears, for example, a part of the side surface of the electrode foil 4 or a portion near the opening 24 of the restraining jig 20 along the arc surface of the concave portion. May be. In addition, the open portion is not limited to being formed in a linear shape, for example, and may be formed in a shape such as a “V” shape in addition to a curved shape with respect to the end face side of the electrode foil 4. The shape of the open portion is set by the shape of the shearing surface of the cold pressure welding mold.

(5) 上記実施の形態では、引出し端子2と電極箔4とに対して冷間圧接金型による接続工程は1回で行われる場合を示しているがこれに限られない。押圧角度の異なる冷間圧接金型により複数回で押圧してもよい。この場合、たとえば1回目の押圧工程において、電極箔に開放部を形成すればよい。これにより、2回目以降の押圧により引出し端子2の金属流動によって、電極箔4の接続部に外力が負荷されるのを防止できる。   (5) In the above-described embodiment, the case where the connection process using the cold pressure welding die is performed once with respect to the extraction terminal 2 and the electrode foil 4 is not limited to this. You may press in multiple times with the cold press-contact metal mold | die from which a press angle differs. In this case, for example, an open portion may be formed in the electrode foil in the first pressing step. Thereby, it can prevent that external force is loaded to the connection part of the electrode foil 4 by the metal flow of the extraction | drawer terminal 2 by the press after the 2nd time.

(6) 上記実施の形態では、引出し端子2の側面および底面側に接触して拘束する拘束治具20と、電極箔4の上側に載せて、電極箔4および引出し端子2を拘束する拘束治具40を用いる場合を示したがこれに限られない。コンデンサの製造では、引出し端子2を拘束する拘束治具20のみを利用してもよい。
(6) In the embodiment described above, the restraining jig 20 that restrains the electrode terminal 4 on the upper side of the electrode foil 4 and the restraining tool 20 that restrains the electrode foil 4 and the lead terminal 2 on the side surface and bottom surface side of the lead terminal 2 and restrains them. Although the case where the tool 40 was used was shown, it is not restricted to this. In manufacturing the capacitor, only the restraining jig 20 that restrains the lead terminal 2 may be used.

本発明は、電極箔の一部に開放部を形成することで、拘束治具を用いた冷間圧接工程に対し、一定方向に変形する引出し端子の変形に対して、電極箔の接続強度の低下を防止することができる。これにより、コンデンサの信頼性の向上などに寄与し、極めて有益である。
In the present invention, by forming an open portion in a part of the electrode foil, the connection strength of the electrode foil is reduced with respect to the deformation of the lead terminal that is deformed in a certain direction with respect to the cold welding process using the restraining jig. A decrease can be prevented. This contributes to improving the reliability of the capacitor and is extremely useful.

2 引出し端子
4 電極箔
6 支持部
8 偏平部
10 外部リード
12、50−I、50−II 凹部
14 冷間圧接部
16−I、16−II、54、56 開放部
20、40 拘束治具
21 載置部
22 保持部
24 開口部
26 側壁部
30、60、60A、60B 冷間圧接金型
32 押圧面
34、66 側面部
42 貫通孔
52 冷間圧接部
62 接続面部
64 押圧部
2 Lead terminal 4 Electrode foil 6 Support part 8 Flat part 10 External lead 12, 50-I, 50-II Concave part 14 Cold pressure contact part 16-I, 16-II, 54, 56 Open part 20, 40 Restraint jig 21 Placement part 22 Holding part 24 Opening part 26 Side wall part 30, 60, 60A, 60B Cold pressure welding die 32 Press surface 34, 66 Side surface part 42 Through-hole 52 Cold pressure contact part 62 Connection surface part 64 Press part

Claims (5)

引出し端子の長手方向の側面側を拘束するとともに、引出し端子の外部リード側を開放する第1の拘束治具に設置した該引出し端子に電極箔を重ね、冷間圧接法により前記引出し端子と前記電極箔との接続部を形成するとともに、前記外部リード側を剪断する、
ことを特徴とするコンデンサの製造方法。
While constraining the side surface side in the longitudinal direction of the lead terminal, the electrode foil is overlaid on the lead terminal installed in the first restraining jig that opens the external lead side of the lead terminal, and the lead terminal and the above-mentioned are connected by the cold welding method. Forming a connection with the electrode foil and shearing the external lead side;
A method of manufacturing a capacitor.
前記引出し端子と前記電極箔との接続部を形成するとともに、更に、前記外部リード側と反対側の電極箔の縁部側を剪断することを特徴とする請求項1に記載のコンデンサの製造方法。   2. The method of manufacturing a capacitor according to claim 1, wherein a connection portion between the lead terminal and the electrode foil is formed, and an edge portion side of the electrode foil opposite to the external lead side is further sheared. 3. . さらに、前記引出し端子に重ねた前記電極箔の上側に、前記第1の拘束治具と組み合わせて前記引出し端子および前記電極箔を拘束する第2の拘束治具を設置する工程を含むことを特徴とする請求項1または請求項2に記載のコンデンサの製造方法。   Further, the method includes a step of installing a second restraining jig for restraining the lead terminal and the electrode foil in combination with the first restraining jig on the upper side of the electrode foil superimposed on the lead terminal. A method for manufacturing a capacitor according to claim 1 or 2. 外部リードを有する引出し端子と電極箔とを冷間圧接により接続させたコンデンサであって、
該引出し端子の長手方向の側面側を拘束する拘束治具に固定された前記引出し端子と前記電極箔とが重なる部分を冷間圧接金型で押圧して形成された接続部と、
前記接続部の外部リード側に、前記冷間圧接金型の剪断部との接触面に沿って前記電極箔が剪断された開放部と、
を備えることを特徴とするコンデンサ。
A capacitor in which a lead terminal having an external lead and an electrode foil are connected by cold welding,
A connecting portion formed by pressing a portion where the lead terminal and the electrode foil are fixed to a restraining jig for restraining a side surface in the longitudinal direction of the lead terminal with a cold pressure die;
On the external lead side of the connection part, an open part in which the electrode foil is sheared along a contact surface with the shearing part of the cold pressure welding mold,
A capacitor comprising:
前記電極箔は、幅方向に対して最も側面側に対向して複数の前記開放部が形成されることを特徴とする請求項4に記載のコンデンサ。

5. The capacitor according to claim 4, wherein the electrode foil is formed with a plurality of the opening portions so as to face the side surface most in the width direction.

JP2015068342A 2015-03-30 2015-03-30 Capacitor and method of manufacturing the same Pending JP2016189384A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007273645A (en) * 2006-03-30 2007-10-18 Nippon Chemicon Corp Capacitor
WO2013157275A1 (en) * 2012-04-20 2013-10-24 日本ケミコン株式会社 Capacitor and method for manufacturing same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007273645A (en) * 2006-03-30 2007-10-18 Nippon Chemicon Corp Capacitor
WO2013157275A1 (en) * 2012-04-20 2013-10-24 日本ケミコン株式会社 Capacitor and method for manufacturing same

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