JP4556595B2 - Electrolytic capacitor manufacturing method - Google Patents
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Description
本発明は、電解コンデンサの製造方法に関するものであり、特に、電極箔の引き出し端子との接続部分を加熱溶融して、アルミニウムと酸化皮膜層との混合層からなる接続部を形成することにより、引き出し端子と電極箔との安定した接続状態を得ることができる電解コンデンサの製造方法に関するものである。 The present invention relates to a method for manufacturing an electrolytic capacitor, and in particular, by heating and melting a connection portion with an extraction terminal of an electrode foil to form a connection portion composed of a mixed layer of aluminum and an oxide film layer, The present invention relates to a method of manufacturing an electrolytic capacitor capable of obtaining a stable connection state between a lead terminal and an electrode foil .
従来、電解コンデンサを製造する際、例えば巻回型コンデンサの場合は、アルミニウムからなる芯金の表面にエッチング層と酸化皮膜層を有する電極箔に、引き出し端子をステッチ、コールドウェルド、超音波溶接などにより接続し、電極箔の間にセパレータを介して巻回又は積層してコンデンサ素子を形成し、このコンデンサ素子を駆動用電解液に含浸するとともに、外装ケースに収納して電解コンデンサを形成している。 Conventionally, when manufacturing an electrolytic capacitor, for example, in the case of a winding capacitor, an electrode foil having an etching layer and an oxide film layer on the surface of a cored bar made of aluminum, a lead terminal is stitched, cold welded, ultrasonic welding, etc. To form a capacitor element by winding or laminating between electrode foils via a separator, impregnating the capacitor element with a driving electrolyte solution, and storing the capacitor element in an outer case to form an electrolytic capacitor. Yes.
このような電極箔のうち、低圧箔は、芯金が厚く、エッチング層上には薄い酸化皮膜層が形成されているのに対し、高圧箔では、芯金が薄く、エッチング層上に厚い酸化皮膜が形成されている。 Among such electrode foils, the low pressure foil has a thick cored bar and a thin oxide film layer formed on the etching layer, whereas the high pressure foil has a thin cored bar and a thick oxidized layer on the etched layer. A film is formed.
このような電極箔と引き出し端子との接続においては、引き出し端子が、電極箔の表面にあるエッチング層や酸化皮膜層を超えて、電極箔の芯金部分と直接に接続されることが必要であるため、特に、酸化皮膜の厚い高圧箔では、電極箔と引き出し端子との接続状態の信頼性が劣っていた。 In such connection between the electrode foil and the lead terminal, it is necessary that the lead terminal is directly connected to the core metal portion of the electrode foil beyond the etching layer or oxide film layer on the surface of the electrode foil. Therefore, in particular, in the high-pressure foil having a thick oxide film, the reliability of the connection state between the electrode foil and the lead terminal is inferior.
このような問題点を解決するため、従来から種々の提案がなされている。例えば、電極箔の引き出し端子接続部の酸化皮膜を、予め、プレスや研磨などによって機械的に除去したり、あるいはアークなどによって電気的に除去し、その除去部分に引き出し端子を加締め接続したものがある（例えば、特許文献１参照）。 In order to solve such problems, various proposals have been conventionally made. For example, the oxide film on the lead terminal connection part of the electrode foil is mechanically removed beforehand by pressing or polishing, or electrically removed by arc or the like, and the lead terminal is crimped and connected to the removed part (For example, refer to Patent Document 1).
また、電極箔の引き出し端子接続部の酸化皮膜層及びエッチング層を、粗面性のある回転ローラにより電極箔を挟み込み、回転させたり、電極箔に超音波振動装置を接触させて粉砕するなどして予め除去し、その除去部分に引き出し端子を加締め接続したものがある（例えば、特許文献２参照）。さらに、切削、研削、破壊、折り曲げ、ヒートショック等の方法を用いて、予め接続部に酸化皮膜を形成しないようにしたものがある（例えば、特許文献３参照）。 Also, the oxide film layer and the etching layer of the electrode foil lead-out terminal connection portion are rotated by sandwiching the electrode foil with a rough roller, or pulverized by contacting the electrode foil with an ultrasonic vibration device. In some cases, the lead-out terminal is crimped and connected to the removed portion (see, for example, Patent Document 2). Further, there is a technique in which an oxide film is not formed on a connection portion in advance using a method such as cutting, grinding, destruction, bending, heat shock, or the like (for example, see Patent Document 3).
しかしながら、従来の技術には次のような問題点があった。
すなわち、酸化皮膜層をプレスや研磨などによって機械的に除去する方法や、酸化皮膜層及びエッチング層を回転ローラや超音波振動などによって機械的に除去する方法では、電極箔に除去治具を直接的に接触させて酸化皮膜層やエッチング層を除去しているため、接触時の機械的ストレスが、電極箔自体、例えば電極箔の芯金部分や除去部分近傍の酸化皮膜層及びエッチング層に加わることによって、損傷や歪み等が起こり、また前記除去治具の一部が電極箔に転写するなどにより、電極箔の信頼性を悪化させるという問題点があった。
However, the conventional technique has the following problems.
That is, in the method of mechanically removing the oxide film layer by pressing or polishing, or the method of mechanically removing the oxide film layer and the etching layer by a rotating roller or ultrasonic vibration, a removal jig is directly attached to the electrode foil. Since the oxide film layer and the etching layer are removed by contact with each other, mechanical stress at the time of contact is applied to the electrode foil itself, for example, the core metal part of the electrode foil and the oxide film layer and the etching layer in the vicinity of the removal part. As a result, damage, distortion, and the like occur, and a part of the removal jig is transferred to the electrode foil, thereby deteriorating the reliability of the electrode foil.
また、酸化皮膜層及びエッチング層を機械的に除去した際に、除去部分にバリ等が発生し、バリを除去する工程を追加する必要が生じ、製造工程が煩雑化するといった問題点もあった。さらに、酸化皮膜層をアークによって電気的に除去する際、アークの投入エネルギーの調節やアーク放電位置の調節などのアーク放電現象の制御が困難であるため、例えば、小型品等のように電極箔の箔幅が狭く、除去範囲が限られているなど、特定箇所のみの除去には適していなかった。また、予め酸化皮膜を形成しないようにするには、マスキングなどを施す必要があり、工程が煩雑なものとなっていた。 In addition, when the oxide film layer and the etching layer are mechanically removed, burrs or the like are generated in the removed portion, and it is necessary to add a process for removing the burrs, which causes a problem that the manufacturing process becomes complicated. . Furthermore, when the oxide film layer is electrically removed by an arc, it is difficult to control arc discharge phenomena such as adjustment of arc input energy and arc discharge position. The foil width was narrow and the removal range was limited. Further, in order not to form the oxide film in advance, it is necessary to perform masking or the like, and the process is complicated.
本発明は、上述したような従来技術の問題点を解決するために提案されたものであり、その目的は、機械的に酸化皮膜層及びエッチング層を除去した際に生じるバリ等の発生や、機械的ストレスの印加による損傷や歪みの発生を防止し、安定した引き出し端子と電極箔の接続状態を得ることができる電解コンデンサの製造方法を提供することにある。 The present invention has been proposed in order to solve the problems of the prior art as described above, and its purpose is to generate burrs and the like that occur when the oxide film layer and the etching layer are mechanically removed, An object of the present invention is to provide an electrolytic capacitor manufacturing method capable of preventing the occurrence of damage and distortion due to application of mechanical stress and obtaining a stable connection state between the lead terminal and the electrode foil.
上記課題を解決するため、請求項１に記載の発明は、表面に酸化皮膜層及びエッチング層を備えた電極箔に引き出し端子を接続し、この電極箔を、セパレータを介して巻回又は積層する電解コンデンサの製造方法において、アルミニウム芯金とエッチング層と該エッチング層上に形成された酸化皮膜層とからなる電極箔の前記引き出し端子接続部位に、所定のレーザ光を照射することにより、その照射部位を加熱して溶融させ、アルミニウムと酸化皮膜層との混合層を形成する工程と、形成された前記混合層に前記引き出し端子を接続する工程を有することを特徴とする。 In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a lead terminal is connected to an electrode foil having an oxide film layer and an etching layer on the surface, and this electrode foil is wound or laminated via a separator. In the method of manufacturing an electrolytic capacitor, irradiation is performed by irradiating a predetermined laser beam to the lead terminal connecting portion of an electrode foil composed of an aluminum cored bar, an etching layer, and an oxide film layer formed on the etching layer. It has a step of heating and melting the part to form a mixed layer of aluminum and an oxide film layer, and a step of connecting the lead terminal to the formed mixed layer.
このような請求項１に記載の発明によれば、電極箔の所定の部位（引き出し端子接続部位）を加熱して溶融させることにより、アルミニウムと酸化皮膜層との混合層からなる新たな接続部を形成することができ、この接続部は表面に酸化皮膜層がなく平坦状であると共に所定の厚さを維持することができるため、接続部としての強度が増し、これによって、引き出し端子との良好な接続状態を得ることができる電解コンデンサを製造することができる。According to the invention described in claim 1, a new connection portion made of a mixed layer of aluminum and an oxide film layer is obtained by heating and melting a predetermined portion (extraction terminal connection portion) of the electrode foil. This connection portion has no oxide film layer on the surface and is flat and can maintain a predetermined thickness, so that the strength as the connection portion is increased. An electrolytic capacitor capable of obtaining a good connection state can be manufactured.
請求項２に記載の発明は、請求項１に記載の電解コンデンサの製造方法において、前記加熱の手段が、パルスＹＡＧレーザ光であることを特徴とする。パルスＹＡＧレーザは、１照射あたりの発光のピーク値が比較的低く、発光幅が長いため、電極箔にレーザ照射される際に、照射側の反対側まで十分な加熱がなされ、その結果、電極箔のアルミニウム芯金、エッチング層及び酸化皮膜層が溶融して混合され、良好な接続部が形成される。According to a second aspect of the present invention, in the method for manufacturing an electrolytic capacitor according to the first aspect, the heating means is a pulsed YAG laser beam. Since the pulse YAG laser has a relatively low light emission peak value per irradiation and a long light emission width, when the electrode foil is irradiated with the laser, sufficient heating is performed up to the opposite side of the irradiation side. The aluminum cored bar, the etching layer, and the oxide film layer of the foil are melted and mixed to form a good connection.
本発明によれば、機械的に酸化皮膜層及びエッチング層を除去した際に生じるバリ等の発生や、機械的ストレスの印加による損傷や歪みの発生を防止し、安定した引き出し端子と電極箔の接続状態を得ることができる電解コンデンサの製造方法を提供することができる。 According to the present invention, it is possible to prevent the occurrence of burrs or the like generated when the oxide film layer and the etching layer are mechanically removed, and the occurrence of damage and distortion due to the application of mechanical stress. The manufacturing method of the electrolytic capacitor which can obtain a connection state can be provided.
以下、本発明の実施の形態について図を参照して詳細に説明する。
（１）構成
図１は、本発明に係る巻回型電解コンデンサ素子２の構成を示したものであって、巻回型コンデンサ素子２は、その最外側に第１のセパレータ４が配置され、その内側に陰極箔６が積層される。この陰極箔６の内側にさらに第２のセパレータ８が積層され、第２のセパレータ８の内側に陽極箔１０が積層される。また、巻回型電解コンデンサ素子２は、陽極箔１０に陽極引き出し端子１２が、また、陰極箔６に陰極引き出し端子１４がそれぞれ接続されている。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(1) Configuration FIG. 1 shows a configuration of a wound electrolytic capacitor element 2 according to the present invention. The wound capacitor element 2 has a first separator 4 disposed on the outermost side, The cathode foil 6 is laminated on the inside. A second separator 8 is further laminated inside the cathode foil 6, and an anode foil 10 is laminated inside the second separator 8. In the wound electrolytic capacitor element 2, an anode lead terminal 12 is connected to the anode foil 10, and a cathode lead terminal 14 is connected to the cathode foil 6.
そして、第１のセパレータ４と陰極箔６、第２のセパレータ８と陽極箔１０とは先に述べた順序で積層され、陽極箔１０を内側にして巻回され、巻終わり端が巻止めテープにて固定された巻回型構造とされている。なお、陽極箔１０及び陰極箔６はアルミニウム箔で形成されている。 The first separator 4 and the cathode foil 6, the second separator 8 and the anode foil 10 are laminated in the order described above, wound with the anode foil 10 inside, and the winding end is a winding stop tape. It is a winding type structure fixed at. The anode foil 10 and the cathode foil 6 are made of aluminum foil.
（２）電解コンデンサの製造方法
次に、図２に基づき、本発明の巻回型電解コンデンサの製造方法を説明する。
まず、陽極箔１０としてアルミニウムなどの弁作用金属からなる金属箔に、エッチング処理を施し、その後化成処理を施すことで、エッチング層と該層上に形成された酸化皮膜層１８を設け（図２（Ａ））、陰極箔６はエッチング処理が施されているが、必要に応じて酸化皮膜層が設けられる。
(2) Method for Manufacturing Electrolytic Capacitor Next, a method for manufacturing the wound electrolytic capacitor of the present invention will be described based on FIG.
First, a metal foil made of a valve action metal such as aluminum is subjected to an etching treatment as the anode foil 10, and then a chemical conversion treatment is performed to provide an etching layer and an oxide film layer 18 formed on the layer (FIG. 2). (A)) The cathode foil 6 has been subjected to an etching treatment, but an oxide film layer is provided as necessary.
図２（Ｂ）に示すように、電極箔６，１０の上部にレーザ源２４を配置し、電極箔６，１０とレーザ源２４の間にレンズ２２を配置する。そして、電極箔６，１０の表面に形成された酸化皮膜層１８の所定の部位、すなわち、引き出し端子１２，１４を接続する部位に、レンズ２２を通過して集束されたレーザ光２０を照射して、電極箔の所定箇所を加熱する。 As shown in FIG. 2B, the laser source 24 is disposed on the electrode foils 6 and 10, and the lens 22 is disposed between the electrode foils 6 and 10 and the laser source 24. Then, a predetermined portion of the oxide film layer 18 formed on the surface of the electrode foils 6, 10, that is, a portion connecting the lead terminals 12, 14 is irradiated with the laser light 20 focused through the lens 22. Then, a predetermined portion of the electrode foil is heated.
この加熱により、電極箔を構成するアルミニウム芯金とエッチング層と該エッチング層上に形成された酸化皮膜層とを溶融させて、アルミニウムと酸化皮膜層との混合層からなる接続部３０を形成する。その後、この接続部３０に引き出し端子１２，１４をコールドウェルド等により接続する。接続後、陽極箔１０と陰極箔６の間にセパレータ４，８を介して巻回し、巻終わり端を巻止めテープにて固定し、コンデンサ素子２を形成する。その後、コンデンサ素子２を駆動用電解液に含浸させ、アルミニウムなどからなる有底筒状の金属ケースに収納し、封口部材にて封止して、電解コンデンサを得る。 By this heating, the aluminum cored bar constituting the electrode foil, the etching layer, and the oxide film layer formed on the etching layer are melted to form the connection portion 30 composed of a mixed layer of aluminum and the oxide film layer. . Thereafter, the lead terminals 12 and 14 are connected to the connection portion 30 by cold welding or the like. After the connection, winding is performed between the anode foil 10 and the cathode foil 6 via the separators 4 and 8, and the winding end is fixed with a winding tape to form the capacitor element 2. Thereafter, the capacitor element 2 is impregnated with a driving electrolyte, and is stored in a bottomed cylindrical metal case made of aluminum or the like, and sealed with a sealing member to obtain an electrolytic capacitor.
なお、照射するレーザ光としては、例えば、パルス幅５ｍｓｅｃ、波長１０６４ｎｍ、出力４．３ＪのパルスＹＡＧレーザを用いることができる。なお、パルス幅は０．５〜２０ｍｓｅｃ、出力は１〜１０Ｊが好ましい。パルスＹＡＧレーザは、１照射あたりの発光のピーク値が比較的低く、発光幅が長いため、電極箔にレーザ照射される際に、照射側の反対側まで十分な加熱がなされ、電極箔のアルミニウム芯金、エッチング層及び酸化皮膜層が溶融して混合し、良好な接続部が形成される。 As a laser beam to be irradiated, for example, a pulse YAG laser having a pulse width of 5 msec, a wavelength of 1064 nm, and an output of 4.3 J can be used. The pulse width is preferably 0.5 to 20 msec and the output is preferably 1 to 10 J. Since the pulse YAG laser has a relatively low emission peak value per irradiation and a long emission width, when the electrode foil is irradiated with the laser, sufficient heating is performed to the opposite side of the irradiation side, and the aluminum of the electrode foil The cored bar, the etching layer, and the oxide film layer are melted and mixed to form a good connection portion.
なお、アルミニウムと酸化皮膜層との混合層からなる接続部は、図３に示すような構造となっている。
また、照射するレーザ光は、電極箔の所定部位を加熱溶融できるものであれば、その種類は特に限定されず、また、照射回数も特に限定されない。
In addition, the connection part which consists of a mixed layer of aluminum and an oxide film layer has a structure as shown in FIG.
Further, the type of laser light to be irradiated is not particularly limited as long as it can heat and melt a predetermined portion of the electrode foil, and the number of times of irradiation is not particularly limited.
（３）効果
上述したように、本発明によれば、引き出し端子の接続部となる電極箔の一部を、レーザ光を照射することによって局部的に加熱し、その部分のアルミニウム芯金とエッチング層と該エッチング層上に形成された酸化皮膜層とを溶融させることにより、アルミニウムと酸化皮膜層との混合層からなる新たな接続部を形成することができる。また、この接続部は、表面に酸化皮膜層がなく平坦状であると共に所定の厚さを維持することができるため、接続部としての強度が増し、これによって、引き出し端子との良好な接続が可能となる。
(3) Effect As described above, according to the present invention, a part of the electrode foil serving as the connection portion of the lead terminal is locally heated by irradiating the laser beam, and the aluminum core metal and the etching of the portion are etched. By melting the layer and the oxide film layer formed on the etching layer, a new connection portion made of a mixed layer of aluminum and the oxide film layer can be formed. In addition, since the connecting portion is flat without an oxide film layer on the surface and can maintain a predetermined thickness, the strength as the connecting portion is increased, and thereby a good connection with the lead terminal is achieved. It becomes possible.
従って、従来のように、電極箔の表面の一部に酸化皮膜を形成しないようにするためにマスキングなどを施す、または電極箔の表面の酸化皮膜層を後処理にて除去するなどの煩雑な工程が不要となる。また、酸化皮膜層が厚く形成された高圧箔であっても、上記加熱工程のみによって、表面に酸化皮膜のない良好な接続部を形成することができる。 Therefore, as in the prior art, a masking or the like is performed to prevent the formation of an oxide film on a part of the surface of the electrode foil, or the oxide film layer on the surface of the electrode foil is removed by post-processing. A process becomes unnecessary. Moreover, even if it is the high pressure foil in which the oxide film layer was formed thickly, the favorable connection part which does not have an oxide film on the surface can be formed only by the said heating process.
（４）他の実施形態
なお、上記の実施形態では巻回型電解コンデンサについて説明したが、陰極箔に陰極用引き出し端子を接続し、陽極箔に陽極用引き出し端子を接続し、電極箔間にセパレータを介在して電極箔を交互に複数重ね合わせた積層型電解コンデンサにも適用することができる。
(4) Other Embodiments Although the winding type electrolytic capacitor has been described in the above embodiment, the cathode lead terminal is connected to the cathode foil, the anode lead terminal is connected to the anode foil, and the electrode foil is interposed between the electrode foils. The present invention can also be applied to a multilayer electrolytic capacitor in which a plurality of electrode foils are alternately stacked with a separator interposed therebetween.
また、本発明において、アルミニウムと酸化皮膜層の加熱溶融に用いられるレーザとしては、パルスＹＡＧレーザの他に、エキシマレーザ、ＣＯ2レーザを用いることもできる。さらに、本発明において用いられる溶接の手段としては、ステッチ、コールドウェルド、超音波溶接、摩擦撹拌溶接、レーザ溶接などがある。 In the present invention, an excimer laser or a CO 2 laser can be used in addition to the pulse YAG laser as a laser used for heating and melting the aluminum and oxide film layers. Further, the welding means used in the present invention include stitch, cold weld, ultrasonic welding, friction stir welding, laser welding and the like.
また、本発明において、レーザ源２４からのレーザ光２０をレンズ２２により集束させて所定部位に照射する際に、レンズ２２の形状や照射距離を変えることで照射するレーザ光２０の面積やレーザエネルギーを容易に変更することができる。 Further, in the present invention, when the laser beam 20 from the laser source 24 is focused by the lens 22 and irradiated to a predetermined site, the area and laser energy of the laser beam 20 irradiated by changing the shape and irradiation distance of the lens 22 are changed. Can be easily changed.
さらに、レーザ光２０を照射する際に、ヘリウムガスやアルゴンガスなどの不活性気体を所定部位に吹き付けると、電極箔の接続部分の表面状態が良好となる。
また、酸化皮膜層の引き出し端子接続部分にカーボン層を設けて、そのカーボン層にレーザ光２０を照射すると、酸化皮膜層１８及びエッチング層の熱吸収が高められるので、加熱溶融を促進させることができる。あるいは、まずレーザ光２０を照射することにより少なくとも酸化皮膜層１８を一部溶融した後、その表面にカーボン層を設け、さらにレーザ光２０を照射することで加熱溶融の速度を上げることもできる。
Further, when an inert gas such as helium gas or argon gas is blown onto a predetermined portion when the laser beam 20 is irradiated, the surface state of the connection portion of the electrode foil becomes good.
Further, when a carbon layer is provided at the lead terminal connecting portion of the oxide film layer and the carbon layer is irradiated with the laser beam 20, heat absorption of the oxide film layer 18 and the etching layer is enhanced, so that heating and melting can be promoted. it can. Alternatively, first, at least a portion of the oxide film layer 18 is melted by irradiating the laser beam 20, and then a carbon layer is provided on the surface, and the laser beam 20 is further irradiated to increase the heating and melting speed.
また、本発明において、電極箔の引き出し端子接続部位を、予め酸化皮膜層の一部を除去し、この状態で加熱溶融させて新たな接続部を形成しても良い。酸化皮膜層の除去方法としては、研削、切削、研磨、レーザ照射、アーク、超音波振動、化学処理等がある。このようにして形成された接続部は、予め酸化皮膜層が除去された状態であるため、形成された接続部中の酸化皮膜層の絶対量を少なくでき、従って抵抗が低く良好な接続部が形成される。 Further, in the present invention, a part of the oxide film layer may be removed in advance from the lead terminal connection portion of the electrode foil, and a new connection portion may be formed by heating and melting in this state. As a method for removing the oxide film layer, there are grinding, cutting, polishing, laser irradiation, arc, ultrasonic vibration, chemical treatment, and the like. Since the connection portion thus formed is in a state in which the oxide film layer has been removed in advance, the absolute amount of the oxide film layer in the formed connection portion can be reduced, and therefore a good connection portion with low resistance can be obtained. It is formed.
２…巻回型電解コンデンサ素子
４…第１のセパレータ
６…陰極箔
８…第２のセパレータ
１０…陽極箔
１２…陽極引き出し端子
１４…陰極引き出し端子
１６…金属箔（アルミニウム芯金）
２０…レーザ光
２２…レンズ
２４…レーザ源
３０…混合層からなる接続部
2 ... Winding type electrolytic capacitor element 4 ... First separator 6 ... Cathode foil 8 ... Second separator 10 ... Anode foil 12 ... Anode lead terminal 14 ... Cathode lead terminal 16 ... Metal foil (aluminum core)
20 ... Laser beam 22 ... Lens 24 ... Laser source 30 ... Connection portion comprising a mixed layer
Claims (2)
アルミニウム芯金とエッチング層と該エッチング層上に形成された酸化皮膜層とからなる電極箔の前記引き出し端子接続部位に、所定のレーザ光を照射することにより、その照射部位を加熱して溶融させ、アルミニウムと酸化皮膜層との混合層を形成する工程と、形成された前記混合層に前記引き出し端子を接続する工程を有することを特徴とする電解コンデンサの製造方法。 In the method of manufacturing an electrolytic capacitor in which a lead terminal is connected to an electrode foil having an oxide film layer and an etching layer on the surface, and this electrode foil is wound or laminated via a separator.
By irradiating a predetermined laser beam to the lead terminal connecting portion of the electrode foil composed of an aluminum cored bar, an etching layer, and an oxide film layer formed on the etching layer, the irradiated portion is heated and melted. A method for manufacturing an electrolytic capacitor , comprising: forming a mixed layer of aluminum and an oxide film layer; and connecting the lead terminal to the formed mixed layer .
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