JP2008305890A - Aluminum electrolytic capacitor - Google Patents

Aluminum electrolytic capacitor Download PDF

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JP2008305890A
JP2008305890A JP2007150204A JP2007150204A JP2008305890A JP 2008305890 A JP2008305890 A JP 2008305890A JP 2007150204 A JP2007150204 A JP 2007150204A JP 2007150204 A JP2007150204 A JP 2007150204A JP 2008305890 A JP2008305890 A JP 2008305890A
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wire
aluminum
foil
electrolytic capacitor
lead wire
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Hiroshi Kurimoto
浩 栗本
Kohei Harazono
講平 原薗
Toshiya Maehara
敏哉 前原
Takanao Saito
孝尚 斉藤
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Panasonic Corp
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Panasonic Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum electrolytic capacitor which is excellent in jointing strength and connection reliability between a lead wire for drawing out and a positive electrode foil or negative electrode foil. <P>SOLUTION: The aluminum electrolytic capacitor comprises a bottomed cylindrical metal case which houses, along with an electrolyte for driving, a capacitor element in which a positive electrode foil and a negative electrode foil jointed to a lead wire 20 for drawing out are wound with a separator in between, and a sealing body which seals an open end of the metal case. The lead wire 20 for drawing out jointed to the positive electrode foil/negative electrode foil 27 comprises: a flat part 22 which is a flat part obtained by processing the other end side of an aluminum wire rod part 21, with an external connection wire 23 jointed to its one end; and a plurality of protruding parts 25 provided on the flat part 22. The positive electrode foil/negative electrode foil 27 is made to penetrate the protruding part 25 provided on the flat part 22, so that the top part of the protruding part 25 is crushed for jointing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は各種電子機器に使用されるアルミ電解コンデンサに関するものである。   The present invention relates to an aluminum electrolytic capacitor used in various electronic devices.

図4はこの種のアルミ電解コンデンサの構成を示した断面図、図5は同アルミ電解コンデンサを構成するコンデンサ素子の展開斜視図であり、図4、図5において10はコンデンサ素子を示し、このコンデンサ素子10は陽極箔12と陰極箔13をその間にセパレータ14を介在させて巻回することにより構成されており、さらに上記陽極箔12と陰極箔13には夫々外部引き出し用リード線15が接合され、この一対の外部引き出し用リード線15を構成する銅下地錫引鉄線15c(以下、CP線と称す)がコンデンサ素子10から引き出された構成となっているものである。   4 is a sectional view showing the structure of this type of aluminum electrolytic capacitor, FIG. 5 is a developed perspective view of the capacitor element constituting the aluminum electrolytic capacitor, and 10 and 10 in FIG. 4 and FIG. The capacitor element 10 is configured by winding an anode foil 12 and a cathode foil 13 with a separator 14 interposed therebetween, and an external lead wire 15 is joined to each of the anode foil 12 and the cathode foil 13. Then, the copper base tin-drawn iron wire 15c (hereinafter referred to as CP wire) constituting the pair of external lead wires 15 is drawn from the capacitor element 10.

16は上記コンデンサ素子10が図示しない駆動用電解液と共に収納された有底円筒状のアルミニウム製の金属ケース、17は上記コンデンサ素子10から引き出された一対の外部引き出し用リード線15のCP線15cが挿通する貫通孔を備えて上記金属ケース16の開放端を封止した封口体である。   Reference numeral 16 denotes a bottomed cylindrical aluminum metal case in which the capacitor element 10 is housed together with a driving electrolyte (not shown). Reference numeral 17 denotes a CP wire 15c of a pair of external lead wires 15 drawn from the capacitor element 10. This is a sealing body provided with a through hole through which the metal case 16 is sealed.

また、上記外部引き出し用リード線15は、図6にその詳細を示すように、アルミ線丸棒部15aの一端に図示しない穴開け加工をし、この穴内にCP線15cを挿入して溶接等により接合すると共に、上記アルミ線丸棒部15aの他端側を偏平に加工して平面部15bを設け、この平面部15bを陽極箔12(あるいは陰極箔13)に接合するようにしたものであり、この外部引き出し用リード線15の平面部15bと陽極箔12の接合15dは、超音波溶接や針カシメ、または冷間圧接等の手段により行われているものであった。   Further, as shown in detail in FIG. 6, the lead wire 15 for external lead is subjected to drilling (not shown) at one end of the aluminum wire round bar portion 15a, and the CP wire 15c is inserted into this hole for welding or the like. The other end side of the aluminum wire round bar portion 15a is flattened to provide a flat portion 15b, and the flat portion 15b is bonded to the anode foil 12 (or the cathode foil 13). The joining 15d between the flat portion 15b of the external lead wire 15 and the anode foil 12 is performed by means such as ultrasonic welding, needle caulking, or cold pressure welding.

なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献1が知られている。
特開2000−12386号公報
As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2000-12386 A

上記従来のアルミ電解コンデンサにおいて、陽極箔12および/または陰極箔13と外部引き出し用リード線15との接合は超音波溶接や針カシメまたは冷間圧接等の手段により行われているが、超音波溶接接合の場合には、金属間接合をしているので抵抗値が低く、さらに信頼性試験で抵抗値が劣化しないという長所を有する反面、陽極箔12の表面に形成された誘電体酸化皮膜層(図示せず)が悪影響を及ぼして十分な接合強度が得られず、溶接時に発生するスパークが飛散して異物付着を生じたりするという問題があった。   In the conventional aluminum electrolytic capacitor described above, the anode foil 12 and / or the cathode foil 13 and the external lead wire 15 are joined by means such as ultrasonic welding, needle caulking or cold pressure welding. In the case of welding joining, since the metal-to-metal joining is performed, the resistance value is low and the resistance value is not deteriorated in the reliability test. On the other hand, the dielectric oxide film layer formed on the surface of the anode foil 12 is provided. (Not shown) has an adverse effect, and sufficient bonding strength cannot be obtained, and sparks generated during welding are scattered to cause foreign matter adhesion.

また、針カシメによる接合の場合には十分な接合強度が得られるという長所を有する反面、接触抵抗値がやや高く、また陽極箔12および/または陰極箔13と外部引き出し用リード線15に穴明け加工を施した後圧接するため、陽極箔12または陰極箔13に亀裂が生じやすくなり、小型品用には適用できないという問題があった。   Further, in the case of joining by needle caulking, it has an advantage that a sufficient joining strength can be obtained, but on the other hand, the contact resistance value is slightly high, and the anode foil 12 and / or the cathode foil 13 and the external lead wire 15 are perforated. Since pressure welding is performed after the processing, the anode foil 12 or the cathode foil 13 is liable to crack, and there is a problem that it cannot be applied to a small product.

また、冷間圧接接合の場合には、上記超音波溶接接合と同様に金属間結合をしているので抵抗値が低く、さらに信頼性試験で抵抗値が劣化しないという長所を有する反面、上記超音波溶接接合や針カシメ接合と比較して接合強度が劣るという問題があり、このように夫々一長一短があるために全てを満足した接合手段がなく、その製品毎に見合った接合手段を選択して対応しているというのが実態であった。   In addition, in the case of cold pressure welding, since the metal-to-metal bonding is performed in the same manner as the ultrasonic welding, the resistance value is low, and further, the resistance value does not deteriorate in the reliability test. There is a problem that the joint strength is inferior compared to sonic welding and needle caulking, and there are no joint means that satisfy all because there are merits and demerits in this way, and select the joint means that suits each product. The fact was that it was compatible.

本発明はこのような従来の課題を解決し、陽極箔または陰極箔と外部引き出し用リード線との接合強度ならびに接続信頼性が優れた高信頼性のアルミ電解コンデンサを提供することを目的とするものである。   An object of the present invention is to solve such a conventional problem and to provide a highly reliable aluminum electrolytic capacitor excellent in bonding strength and connection reliability between an anode foil or a cathode foil and an external lead wire. Is.

上記課題を解決するために本発明の請求項1に記載の発明は、外部引き出し用リード線が接合された陽極箔と陰極箔をその間にセパレータを介在させて巻回することにより構成されたコンデンサ素子と、このコンデンサ素子に駆動用電解液を含浸して収納した有底筒状の金属ケースと、上記一対の外部引き出し用リード線が挿通する貫通孔を備えて上記金属ケースの開放端を封止した封口体からなるアルミ電解コンデンサにおいて、上記陽極箔及び陰極箔に接合される外部引き出し用リード線が、一端に外部接続線が接合されたアルミ線丸棒部の他端側を偏平に加工した平面部と、その平面部に複数の凸部を設けた構成からなり、上記平面部に設けた凸部に陽極箔または陰極箔を貫通させて、その凸部の頂上部分を押し潰して接合するようにした構成のものである。   In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is a capacitor constituted by winding an anode foil and a cathode foil to which an external lead wire is joined with a separator interposed therebetween. Element, a bottomed cylindrical metal case in which the capacitor element is impregnated with a driving electrolyte, and a through-hole through which the pair of external lead wires are inserted, and the open end of the metal case is sealed. In an aluminum electrolytic capacitor consisting of a closed sealing body, the lead wire for external lead joined to the anode foil and the cathode foil is processed flat on the other end side of the aluminum wire round bar portion with the external connection wire joined to one end. And a plurality of convex portions provided on the flat portion, the anode foil or the cathode foil is passed through the convex portion provided on the flat portion, and the top portion of the convex portion is crushed and joined. Like It was those of the configuration.

これにより、陽極箔または陰極箔と外部引き出し用リード線との接合が、リード線の平面部に設けた凸部に陽極箔/陰極箔を貫通させ、その凸部の頂上部分を押し潰すことにより、外部引き出し用リード線と陽極箔/陰極箔の接合強度が高く、また接触抵抗値の低い接合ができるようになり、従来針カシメ接合では困難であった小型品用に対しても陽極箔/陰極箔に亀裂が生じることなく対応可能な十分な接合強度と優れた接続信頼性を有するアルミ電解コンデンサを実現することができるという作用効果を有する。   As a result, the anode foil / cathode foil and the lead wire for external lead are joined by passing the anode foil / cathode foil through the convex portion provided on the flat portion of the lead wire and crushing the top portion of the convex portion. The lead wire for external lead and the anode foil / cathode foil have a high bonding strength and can be bonded with a low contact resistance value, so that the anode foil / It has the effect of being able to realize an aluminum electrolytic capacitor having sufficient joint strength and excellent connection reliability that can be handled without cracks in the cathode foil.

(実施の形態1)
以下、実施の形態1を用いて、本発明の特に請求項1及び2に記載の発明について詳細に説明する。
(Embodiment 1)
Hereinafter, the first and second aspects of the present invention will be described in detail with reference to the first embodiment.

本発明の実施の形態1によるアルミ電解コンデンサの構成は、上記[背景技術]で説明した図4のアルミ電解コンデンサのものと同じである。   The configuration of the aluminum electrolytic capacitor according to Embodiment 1 of the present invention is the same as that of the aluminum electrolytic capacitor of FIG. 4 described in the above [Background Art].

すなわち、陽極箔と陰極箔をその間にセパレータを介在させて巻回することによりコンデンサ素子10を形成し、このコンデンサ素子10の陽極箔と陰極箔には夫々外部引き出し用リード線15が接合され、この一対の外部引き出し用リード線15を構成するCP線15cがコンデンサ素子10から引き出されている。   That is, a capacitor element 10 is formed by winding an anode foil and a cathode foil with a separator interposed therebetween, and lead wires 15 for external lead are bonded to the anode foil and the cathode foil of the capacitor element 10 respectively. CP wires 15c constituting the pair of external lead wires 15 are drawn from the capacitor element 10.

このコンデンサ素子10を駆動用電解液と共に収納された有底円筒状のアルミニウム製の金属ケース16に挿入し、上記コンデンサ素子10から引き出された一対の外部引き出し用リード線15のCP線15cが挿通する貫通孔を備えた封口体17で上記金属ケース16の開放端を封止した構成のものである。   The capacitor element 10 is inserted into a bottomed cylindrical aluminum metal case 16 housed together with the driving electrolyte, and the CP wire 15c of the pair of external lead wires 15 drawn out from the capacitor element 10 is inserted. The open end of the metal case 16 is sealed with a sealing body 17 having a through-hole.

なお、上記CP線15cは銅下地錫引鉄線を用いたが、これに限定されるものではなく、銅線の表面にSn,Ni,Au,Ag等をメッキしたものを外部接続線として用いることもできる。   In addition, although the said copper wire 15c used the copper base tin-drawn iron wire, it is not limited to this, The thing which plated Sn, Ni, Au, Ag etc. on the surface of a copper wire is used as an external connection line. You can also.

本発明は上記外部引き出し用リード線15と陽極箔/陰極箔の接続に特徴を有するものであり、その構成について図面を用いて以下に説明する。   The present invention is characterized by the connection between the external lead wire 15 and the anode foil / cathode foil, and the configuration thereof will be described below with reference to the drawings.

図1(a)は本発明の実施の形態1で用いた外部引き出し用リード線の側面図であり、同図1(b)は外部引き出し用リード線に陽極箔/陰極箔が接続された平面図である。   FIG. 1A is a side view of an external lead wire used in Embodiment 1 of the present invention, and FIG. 1B is a plan view in which anode foil / cathode foil is connected to the external lead wire. FIG.

図1(a)において、アルミ線丸棒部21の一端に外部接続線23を熱溶着やアーク溶接等により接合部24が形成されて接合されている。アルミ線丸棒部21の他端は偏平に加工した平面部22と、その平面部22に複数の円柱状の凸部25が一体に形成されて外部引き出し用リード線20が構成されている。なお、このアルミ線丸棒部21の平面部22に設けた凸部25は、アルミ線丸棒部21を偏平に加工するときの金型により、一体に形成することができる。   In FIG. 1A, an outer connecting wire 23 is joined to one end of an aluminum wire round bar portion 21 by a welding portion 24 formed by heat welding, arc welding or the like. The other end of the aluminum wire round bar portion 21 has a flat portion 22 processed into a flat shape, and a plurality of columnar convex portions 25 are integrally formed on the flat portion 22 to constitute an external lead wire 20. In addition, the convex part 25 provided in the plane part 22 of this aluminum wire round bar part 21 can be integrally formed with the metal mold | die when processing the aluminum wire round bar part 21 flatly.

そして、この外部引き出し用リード線20の平面部22に、図1(b)に示すように凸部25を貫通させた陽極箔/陰極箔27を配置し、その凸部25の頂上部分を加圧して押し潰し、凸部押し潰し部26を形成することによりアルミ線丸棒部21の平面部22と陽極箔/陰極箔27を接合する。   Then, an anode foil / cathode foil 27 penetrating the convex portion 25 as shown in FIG. 1B is disposed on the flat portion 22 of the lead wire 20 for external lead, and the top portion of the convex portion 25 is added. The flat portion 22 of the aluminum wire round bar portion 21 and the anode foil / cathode foil 27 are joined by forming the convex portion crushing portion 26 by pressing and crushing.

このとき、陽極箔/陰極箔27に凸部25を貫通させる穴を予め設けておくと、陽極箔/陰極箔27の亀裂発生を防止することができる。   At this time, if a hole through which the convex portion 25 penetrates is provided in the anode foil / cathode foil 27 in advance, cracking of the anode foil / cathode foil 27 can be prevented.

上記陽極箔/陰極箔27の穴は、凸部25の外周の少なくとも一ヶ所と接触するような穴の大きさにする。   The hole of the anode foil / cathode foil 27 is sized so as to come into contact with at least one place on the outer periphery of the convex portion 25.

これは、陽極箔/陰極箔27の厚み方向の中心部にアルミニウムからなる金属が存在しているので、穴を開けることによりアルミニウムの金属が露出して、凸部25と接触することにより低い接触抵抗を得ることができる。   This is because there is a metal made of aluminum at the center in the thickness direction of the anode foil / cathode foil 27, so that the aluminum metal is exposed by opening a hole, and the contact with the projection 25 is low. Resistance can be obtained.

なお、上記凸部25の外径はアルミ電解コンデンサの大きさによりそれぞれ異なるが0.5〜1.5mmの範囲であり、陽極箔/陰極箔27の穴径はそれよりも0.1〜1.0mm程度大きくする。   The outer diameter of the convex portion 25 varies depending on the size of the aluminum electrolytic capacitor, but is in the range of 0.5 to 1.5 mm. The hole diameter of the anode foil / cathode foil 27 is 0.1 to 1 more than that. Increase by about 0mm.

このような構成にすることにより、陽極箔/陰極箔27と外部引き出し用リード線20との接合が、アルミ線丸棒部21の平面部22に設けた凸部25に陽極箔/陰極箔27を貫通させ、その凸部25の頂上部分を押し潰すことにより、外部引き出し用リード線20と陽極箔/陰極箔27の接合強度が高く、また接触抵抗値の低い接合ができるようになり、従来針カシメ接合では困難であった小型品用に対しても陽極箔/陰極箔27に亀裂が生じることなく対応可能な十分な接合強度と優れた接続信頼性を有するアルミ電解コンデンサを実現することができるという作用効果を有する。   With this configuration, the anode foil / cathode foil 27 and the external lead wire 20 are joined to the protrusion 25 provided on the flat portion 22 of the aluminum wire round bar portion 21 on the anode foil / cathode foil 27. , And the top portion of the convex portion 25 is crushed so that the bonding strength between the external lead wire 20 and the anode foil / cathode foil 27 is high and the contact resistance value is low. It is possible to realize an aluminum electrolytic capacitor having sufficient bonding strength and excellent connection reliability that can be handled without cracks in the anode foil / cathode foil 27 even for a small-sized product that has been difficult by needle caulking bonding. Has the effect of being able to.

なお、凸部25は少なくとも2個形成してあれば接続強度を維持することができ、平面部22の大きさにより2個以上形成しても良い。   If at least two convex portions 25 are formed, the connection strength can be maintained, and two or more convex portions 25 may be formed depending on the size of the planar portion 22.

また、上記凸部25の形状は円柱状のほか、楕円、角形、略十字形等の柱状の形状を有するものでも、円柱状と同様に亀裂の発生が少なく、接合強度が強くて接触抵抗の小さいものが得られる。   In addition to the cylindrical shape, the convex portion 25 may have a columnar shape such as an ellipse, a square, or a substantially cross shape. A small one is obtained.

また、円柱状の先端部に十字等のくさびを設けることにより、凸部25の先端を押し潰したときに、陽極箔/陰極箔をより強固に固定することができ、接合強度を高めることができる。   Also, by providing a wedge such as a cross at the cylindrical tip, the anode foil / cathode foil can be more firmly fixed when the tip of the convex portion 25 is crushed, and the bonding strength can be increased. it can.

(実施の形態2)
以下、実施の形態2を用いて、本発明の特に請求項3に記載の発明について説明する。
(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

本実施の形態2は上記実施の形態1で説明したアルミ電解コンデンサの陽極箔/陰極箔の外部引き出し用リード線において、外部引き出し用リード線のアルミ線丸棒部と外部接続線との接合を断面凹径の金属キャップを用いた構成としたものであり、図2に本発明の実施の形態2によるアルミ電解コンデンサの外部引き出し用リード線に陽極箔/陰極箔が接続された要部側面図を示す。なお、外部引き出し用リード線と陽極箔/陰極箔との接続は上記実施の形態1と同様であるのでここでは省略する。   In the second embodiment, in the lead wire for external lead of the anode foil / cathode foil of the aluminum electrolytic capacitor described in the first embodiment, the aluminum wire round bar portion of the lead wire for external lead and the external connection wire are joined. FIG. 2 is a side view of an essential part in which an anode foil / cathode foil is connected to an external lead wire of an aluminum electrolytic capacitor according to a second embodiment of the present invention. Indicates. The connection between the lead wire for external lead and the anode foil / cathode foil is the same as that in the first embodiment, and is omitted here.

図2において、外部引き出し用リード線30は、アルミ線丸棒部31の一端に断面凹径の金属キャップ33が嵌め込まれており、その金属キャップ33の外部に外部接続線32が接続された構成からなるものである。   In FIG. 2, an external lead wire 30 has a configuration in which a metal cap 33 having a concave cross section is fitted into one end of an aluminum wire round bar portion 31, and an external connection line 32 is connected to the outside of the metal cap 33. It consists of

上記外部引き出し用リード線30のアルミ線丸棒部31と外部接続線32との接合方法を図3(a)(b)(c)(d)に示す。   FIGS. 3A, 3B, 3C, and 3D show a method of joining the aluminum wire round bar 31 of the external lead wire 30 and the external connection line 32. FIG.

図3(a)はアルミ線丸棒部31と外部接続線32を接続する前の初期状態を示し、金属キャップ33は、金属板をプレス加工することによって、開口部33bと、開口部33bに対向するドーム状の端部33aとを備え、開口部33bと端部33aとを結ぶ軸方向に沿った断面が凹形としたものである。   FIG. 3A shows an initial state before the aluminum wire round bar 31 and the external connection line 32 are connected. The metal cap 33 is formed by pressing the metal plate into the opening 33b and the opening 33b. The dome-shaped end portion 33a is opposed to each other, and the cross section along the axial direction connecting the opening portion 33b and the end portion 33a is concave.

外部接続線32は、鉄、ニッケル、銅の単体、鉄合金、ニッケル合金、銅合金などからなる金属基材の線である。また、外部接続線32は、めっき層が形成されてもよく、めっき層として、例えば回路基板との接続のために錫単体、あるいは錫に銀、ビスマス、インジウム、鉛などが添加された錫合金からなる錫系めっきを用いることができる。   The external connection line 32 is a metal substrate line made of iron, nickel, copper alone, iron alloy, nickel alloy, copper alloy, or the like. Further, the external connection line 32 may be formed with a plating layer. As the plating layer, for example, tin alone for connection to a circuit board, or a tin alloy in which silver, bismuth, indium, lead, or the like is added to tin. Tin-based plating made of can be used.

次に図3(b)に示すように、アルミ線丸棒部31の端部は、金属キャップ33の内周に係合するようにプレス加工、またはガラ掛け研磨等によりトリミングした後、図3(c)に示すように、金属キャップ33をアルミ線丸棒部31の端部に嵌め込む。   Next, as shown in FIG. 3B, the end portion of the aluminum wire round bar portion 31 is trimmed by press working, glass polishing or the like so as to engage with the inner periphery of the metal cap 33, and then FIG. As shown in (c), the metal cap 33 is fitted into the end of the aluminum wire round bar 31.

図3(d)において、接続するときの溶接用の電極を外部接続線32とアルミ線丸棒部31に夫々接続し、アーク溶接、抵抗溶接等の電気溶接を用いて、外部接続線32と金属キャップ33との接合を行い、アルミ線丸棒部31は金属キャップ33の内面と接合され、外部接続線32は金属キャップ33の外面端部33aと接合され、外部引き出し用リード線30とした。   In FIG. 3 (d), the electrodes for welding when connecting are connected to the external connection line 32 and the aluminum wire round bar part 31, respectively, and the external connection line 32 is connected to the external connection line 32 using electric welding such as arc welding or resistance welding. Joining with the metal cap 33, the aluminum wire round bar portion 31 is joined to the inner surface of the metal cap 33, and the external connection wire 32 is joined to the outer surface end portion 33 a of the metal cap 33 to form the lead wire 30 for external lead-out. .

なお、金属キャップ33は、金属キャップ33と外部接続線32とを抵抗溶接によって接合する場合、金属キャップ33と外部接続線32との電気抵抗の相違が小さいことが好ましく、例えば外部接続線32が鉄系基材の場合は、金属キャップ33は鉄、ニッケル、鉄ニッケル合金系基材を選択し、外部接続線32が銅系基材の場合は、金属キャップ33は銅、銅合金基材を選択することが望ましく、これによって外部接続線32と金属キャップ33との接合強度を保ちながら、バリ等の形状不良発生を抑制する効果を高めることができる。   The metal cap 33 preferably has a small difference in electrical resistance between the metal cap 33 and the external connection line 32 when the metal cap 33 and the external connection line 32 are joined by resistance welding. In the case of an iron-based substrate, the metal cap 33 is selected from iron, nickel, and an iron-nickel alloy-based substrate. When the external connection line 32 is a copper-based substrate, the metal cap 33 is formed from copper and a copper alloy substrate. It is desirable to select this, whereby the effect of suppressing the occurrence of shape defects such as burrs can be enhanced while maintaining the bonding strength between the external connection line 32 and the metal cap 33.

また、金属キャップ33と外部接続線32とが抵抗溶接等により接合する際に、金属キャップ33とアルミ線丸棒部31の端部との接合部に溶融が生じても、金属キャップ33に被覆されるため、金属キャップ33と外部接続線32との接合部において溶融のバリ等の不良形状の発生がないものとすることができる。   Further, when the metal cap 33 and the external connection line 32 are joined by resistance welding or the like, even if melting occurs at the joint between the metal cap 33 and the end of the aluminum wire round bar portion 31, the metal cap 33 is covered. Therefore, it is possible to prevent the occurrence of defective shapes such as melting burrs at the joint between the metal cap 33 and the external connection line 32.

また、金属キャップ33の端部33aの外面は、平坦状であってもよく、これによって外部接続線32との接合状態を安定にすることができる。   In addition, the outer surface of the end portion 33a of the metal cap 33 may be flat, and thereby, the joining state with the external connection line 32 can be stabilized.

なお、図3では、金属キャップ33の外径は、アルミ線丸棒部31の直径より大きいものであるが、アルミ線丸棒部31の直径と同一あるいは小さくてもよい。例えば、アルミ線丸棒部31の先端をトリミングして細くし、アルミ線丸棒部31の径より小さい外径の金属キャップ33を嵌合してもよいし、また、アルミ線丸棒部31の金属キャップとの接合部のみ径を細くしてもよい。   In FIG. 3, the outer diameter of the metal cap 33 is larger than the diameter of the aluminum wire round bar portion 31, but may be the same as or smaller than the diameter of the aluminum wire round bar portion 31. For example, the tip of the aluminum wire round bar part 31 may be trimmed and thinned, and a metal cap 33 having an outer diameter smaller than the diameter of the aluminum wire round bar part 31 may be fitted, or the aluminum wire round bar part 31 may be fitted. Only the joint portion with the metal cap may be made thinner.

また、アルミ線丸棒部31の他端の平面部は、外部接続線32を接続した後に加工してもよいし、外部接続線32の接続する前に加工しても構わない。   Further, the flat portion at the other end of the aluminum wire round bar 31 may be processed after the external connection line 32 is connected, or may be processed before the external connection line 32 is connected.

このような構成により、外部引き出し用リード線30は、アルミ線丸棒部31と外部接続線32を金属キャップ33により接続するので、外部接続線32の表面に形成した錫めっき層とアルミニウムの溶融金属が存在しなくなるので、錫とアルミニウムとが溶融して発生するいわゆるウィスカーの発生がなくなり、信頼性の高いアルミ電解コンデンサを提供することができる。   With such a configuration, the lead wire 30 for external lead connects the aluminum wire round bar portion 31 and the external connection wire 32 with the metal cap 33, so that the tin plating layer formed on the surface of the external connection wire 32 and the aluminum melt Since no metal is present, so-called whiskers generated by melting of tin and aluminum are eliminated, and a highly reliable aluminum electrolytic capacitor can be provided.

なお、本発明は陽極箔と陰極箔をその間にセパレータを介在させて巻回したコンデンサ素子に駆動用電解液を含浸させたアルミ電解コンデンサについて記述したが、その他に駆動用電解液の代わりに導電性高分子の固体電解質を用いたもの、駆動用電解液と固体電解質の両方用いたアルミ電解コンデンサにも適用できる。   The present invention describes an aluminum electrolytic capacitor in which a driving electrolyte is impregnated in a capacitor element in which an anode foil and a cathode foil are wound with a separator interposed therebetween. The present invention can also be applied to those using a solid electrolyte of a conductive polymer, and an aluminum electrolytic capacitor using both a driving electrolyte and a solid electrolyte.

さらに、集電体の表面に分極性電極を形成し、その集電体に外部引き出し用リード線を接続した電気二重層コンデンサについても、接触抵抗の低い、接続強度の高いものが得られるという効果を得ることができる。   In addition, an electric double layer capacitor in which a polarizable electrode is formed on the surface of the current collector and an external lead wire is connected to the current collector can be obtained with low contact resistance and high connection strength. Can be obtained.

以上のように本発明によるアルミ電解コンデンサは、陽極箔または陰極箔と外部引き出し用リード線との接合が、リード線の平面部に設けた凸部に陽極箔/陰極箔を貫通させ、その凸部の頂上部分を押し潰すことにより、外部引き出し用リード線と陽極箔/陰極箔の接合強度が高く、また接触抵抗値の低い接合ができるようになり、従来針カシメ接合では困難であった小型品用に対しても陽極箔/陰極箔に亀裂が生じることなく対応可能な十分な接合強度と優れた接続信頼性を有するアルミ電解コンデンサを実現することができる。   As described above, in the aluminum electrolytic capacitor according to the present invention, the anode foil / cathode foil and the lead wire for external lead are joined by passing the anode foil / cathode foil through the convex portion provided on the flat portion of the lead wire. By crushing the top part of the part, the joint strength between the lead wire for external lead and the anode foil / cathode foil is high, and the contact resistance value is low. Therefore, it is possible to realize an aluminum electrolytic capacitor having sufficient bonding strength and excellent connection reliability that can be used without any crack in the anode foil / cathode foil.

(a)本発明の実施の形態1による外部引き出し用リード線の側面図、(b)同外部引き出し用リード線に陽極箔/陰極箔を接続した要部平面図(A) Side view of the external lead wire according to the first embodiment of the present invention, (b) Plan view of the main part in which anode foil / cathode foil is connected to the external lead wire 本発明の実施の形態2による外部引き出し用リード線に陽極箔/陰極箔が接続された要部側面図Side view of main part in which anode foil / cathode foil is connected to lead wire for external lead according to embodiment 2 of the present invention 同外部引き出し用リード線の製造工程の一部を表す概念図Conceptual diagram showing a part of the manufacturing process of the external lead wire 従来のアルミ電解コンデンサの構成を示した断面図Sectional view showing the structure of a conventional aluminum electrolytic capacitor 同アルミ電解コンデンサを構成するコンデンサ素子の展開斜視図An exploded perspective view of a capacitor element constituting the aluminum electrolytic capacitor 同アルミ電解コンデンサの外部引き出し用リード線が接合された陽極箔の要部平面図Plan view of the main part of the anode foil to which the lead wire for external lead of the aluminum electrolytic capacitor is joined

符号の説明Explanation of symbols

20 外部引き出し用リード線
21 アルミ線丸棒部
22 平面部
23 外部接続線
24 接合部
25 凸部
26 凸部の押し潰し部
27 陽極箔/陰極箔
DESCRIPTION OF SYMBOLS 20 Lead wire for external drawing 21 Aluminum wire round bar part 22 Plane part 23 External connection line 24 Joint part 25 Convex part 26 Crush part of convex part 27 Anode foil / cathode foil

Claims (3)

外部引き出し用リード線が接合された陽極箔と陰極箔をその間にセパレータを介在させて巻回することにより構成されたコンデンサ素子と、このコンデンサ素子に駆動用電解液を含浸して収納した有底筒状の金属ケースと、上記一対の外部引き出し用リード線が挿通する貫通孔を備えて上記金属ケースの開放端を封止した封口体からなるアルミ電解コンデンサにおいて、上記陽極箔及び陰極箔に接合される外部引き出し用リード線が、一端に外部接続線が接合されたアルミ線丸棒部の他端側を偏平に加工した平面部と、その平面部に複数の凸部を設けた構成からなり、上記平面部に設けた凸部に陽極箔または陰極箔を貫通させて、その凸部の頂上部分を押し潰して接合するようにしたアルミ電解コンデンサ。 A capacitor element formed by winding an anode foil and a cathode foil with an external lead wire joined thereto with a separator interposed therebetween, and a bottomed body in which this capacitor element is impregnated with a driving electrolyte In an aluminum electrolytic capacitor comprising a cylindrical metal case and a sealing body having a through hole through which the pair of external lead wires are inserted and sealing the open end of the metal case, bonded to the anode foil and the cathode foil The lead wire for external lead is composed of a flat portion obtained by processing the other end side of the aluminum wire round bar portion with the external connection wire joined at one end to a flat shape and a plurality of convex portions on the flat portion. An aluminum electrolytic capacitor in which an anode foil or a cathode foil is passed through a convex portion provided on the flat portion, and a top portion of the convex portion is crushed and joined. 陽極箔及び陰極箔に、予め外部引き出し用リード線の凸部を貫通する穴を設けたものである請求項1に記載のアルミ電解コンデンサ。 2. The aluminum electrolytic capacitor according to claim 1, wherein a hole penetrating the convex portion of the lead wire for external lead is provided in advance in the anode foil and the cathode foil. 外部引き出し用リード線のアルミ線丸棒部と外部接続線との接合を断面凹径の金属キャップを用いたものである請求項1または2に記載のアルミ電解コンデンサ。 The aluminum electrolytic capacitor according to claim 1 or 2, wherein a metal cap having a concave cross section is used for joining the aluminum wire round bar portion of the lead wire for external lead and the external connection wire.
JP2007150204A 2007-06-06 2007-06-06 Aluminum electrolytic capacitor Pending JP2008305890A (en)

Priority Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106334761A (en) * 2016-09-14 2017-01-18 铜陵源丰电子有限责任公司 Aluminum electrolytic capacitor guide pin aluminum foil rectifying and riveting mechanism
CN106363091A (en) * 2016-09-21 2017-02-01 铜陵源丰电子有限责任公司 Riveting device for guide needle and aluminum foil of aluminum electrolytic capacitor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106334761A (en) * 2016-09-14 2017-01-18 铜陵源丰电子有限责任公司 Aluminum electrolytic capacitor guide pin aluminum foil rectifying and riveting mechanism
CN106363091A (en) * 2016-09-21 2017-02-01 铜陵源丰电子有限责任公司 Riveting device for guide needle and aluminum foil of aluminum electrolytic capacitor

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