JP2014170832A - Aluminum electrolytic capacitor and method of manufacturing the same - Google Patents

Aluminum electrolytic capacitor and method of manufacturing the same Download PDF

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JP2014170832A
JP2014170832A JP2013041819A JP2013041819A JP2014170832A JP 2014170832 A JP2014170832 A JP 2014170832A JP 2013041819 A JP2013041819 A JP 2013041819A JP 2013041819 A JP2013041819 A JP 2013041819A JP 2014170832 A JP2014170832 A JP 2014170832A
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lead
external terminal
lead tab
hole
electrolytic capacitor
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JP6305682B2 (en
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Takahiro Ishikawa
貴大 石川
Tomoyuki Yoshii
智之 吉井
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Lincstech Circuit Co Ltd
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Hitachi AIC Inc
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Abstract

PROBLEM TO BE SOLVED: To provide an aluminum electrolytic capacitor with higher mechanical connection strength by a rivet connection as a joint of a lead tab and an external terminal and with capacity to reduce connection resistance even when a size of the external terminal is small or in need of heavier current.SOLUTION: An aluminum electrolytic capacitor of the invention is composed of an extraction lead tab extracted from an electrode foil to be connected to an external terminal, a presser plate which presses the lead tab onto the external terminal with a hole part made each on the extraction lead tab and the presser plate fitted into a projection on the end of the external terminal and the projection being caulked and jointed. The aluminum electrolytic capacitor includes a recess made on the opposite side of a pressing surface of the presser plate and a connection part which is made between the recess, the extraction lead tab and the external terminal.

Description

本発明は、アルミニウム電解コンデンサおよびその製造方法に関するものである。特に、アルミニウム電解コンデンサの引き出しリードタブと外部端子との接続に関するものである。   The present invention relates to an aluminum electrolytic capacitor and a method for manufacturing the same. In particular, the present invention relates to a connection between a lead lead tab of an aluminum electrolytic capacitor and an external terminal.

アルミニウム電解コンデンサは、表面をエッチング処理し化成による酸化膜を形成した陽極箔と、表面をエッチング処理し酸化膜を形成しない、あるいは低圧化成による酸化膜を形成した陰極箔とを電解紙等のセパレータを介して巻き回したコンデンサ素子に電解液を含浸し、このコンデンサ素子をケース内に収納後、陽極箔および陰極箔の電極箔から引き出した引き出しリードタブを、封口板を貫通する外部端子にそれぞれ接続し、封口板をケースに取り付けて密閉した構造になっている。   An aluminum electrolytic capacitor is a separator made of electrolytic paper or the like, in which an anode foil whose surface is etched to form an oxide film by chemical conversion and a cathode foil whose surface is etched to form an oxide film or is formed by low pressure chemical conversion are formed. Capacitor element wound through a lead is impregnated with electrolyte, and after this capacitor element is stored in the case, the lead lead tabs drawn from the anode foil and the cathode foil are connected to external terminals penetrating the sealing plate, respectively. The sealing plate is attached to the case and sealed.

従来、このアルミニウム電解コンデンサにおいて、コンデンサ素子の陽極引き出しリードタブもしくは陰極引き出しリードタブと外部端子の接合は、外部端子の端面に外部端子の径よりも細くした突起部を設け、引き出しリータブの端部に穴をあけてその突起部に差し込み、次に押さえ板としての平ワッシャを差し込み、機械的にかしめるかしめ接合をしている。なお、引き出しリータブ、外部端子、そして平ワッシャとも腐食防止のため、いずれもアルミニウムを主体としたものからなっている。
近年、大電流に対応したコンデンサが望まれている。この課題に対して、かしめ接合は、機械的な接合で、接合部分表面の酸化膜のため接続抵抗が増加してしまいやすい。
そのため、特許文献1には、引出しリードタブの先端部を折り曲げて外部端子の端面部分に載置させ、
レーザ溶接で引出しリードタブと外部端子の端面部分とを接合する方法が提案されている。
ところで、上記の引出しリードタブは、レーザによる接合させる前、被接合部分の表面に載せて置かれているため、すき間が存在しやすく、十分な金属接合が得られない場合が生じやすい。
そのため、特許文献2では、外部端子の端面に外部端子の径よりも細くした突起部を設け、引き出しリータブドの端部に穴をあけてその突起部に差し込み、次に押さえ板としての平ワッシャを差し込み、機械的にかしめる従来のかしめ接合する方法に追加して、このかしめ接合側の外部端子の端面部分を上方向から、引出リードタブ部分、平ワッシャ部分、外部端子のかしめ部分、平ワッシャ部分、そして引出リードタブ部分の順に線状にレーザをスキャンしながら照射などして、引出リードタブの一部と、外部端子の引出リードタブと接触する側の部分と、外部端子のかしめ部分と、をレーザ溶接する方法が提案されている。
Conventionally, in this aluminum electrolytic capacitor, the anode lead lead tab of the capacitor element or the cathode lead lead tab and the external terminal are joined to each other by providing a protruding portion that is thinner than the diameter of the external terminal on the end surface of the external terminal, and a hole at the end of the lead lead tab. And is inserted into the projection, and then a flat washer as a presser plate is inserted, and caulking and joining are performed mechanically. Note that all of the drawer lie tab, the external terminal, and the flat washer are mainly made of aluminum to prevent corrosion.
In recent years, a capacitor corresponding to a large current has been desired. For this problem, caulking is mechanical bonding, and the connection resistance tends to increase due to the oxide film on the surface of the bonding portion.
Therefore, in Patent Document 1, the leading end portion of the lead lead tab is bent and placed on the end surface portion of the external terminal,
A method of joining the lead lead tab and the end surface portion of the external terminal by laser welding has been proposed.
By the way, since the lead lead tab is placed on the surface of the part to be joined before being joined by the laser, a gap is likely to exist, and a case where sufficient metal joining cannot be obtained is likely to occur.
For this reason, in Patent Document 2, a protrusion that is thinner than the diameter of the external terminal is provided on the end face of the external terminal, a hole is formed in the end of the lead-out tabbed portion, and the flat washer is used as a holding plate. In addition to the conventional caulking and joining method, which is inserted and mechanically caulked, the end surface portion of the external terminal on the caulking joint side is viewed from the top, leading lead tab portion, flat washer portion, caulking portion of external terminal, and flat washer portion. Then, laser welding is performed while scanning the laser linearly in the order of the lead lead tab part, and laser welding is performed on a part of the lead lead tab, the part of the external terminal that contacts the lead lead tab, and the caulking part of the external terminal. A method has been proposed.

特開平3−34505号公報JP-A-3-34505 特開2002−43176号公報JP 2002-43176 A

かしめ接合で使用される平ワッシャは、引出リードタブを外部端子に押さえこむ押さえ板として使用するため、板厚は厚く、そのため放熱性が大きいため、レーザが貫通するのは容易ではない。また、レーザの出力をあげ、平ワッシャを貫通するように外部端子の端面部分をレーザでスキャンしながら照射すると、平ワッシャが破断してしまう。そのため、平ワッシャが破断しないようなパワーで、かしめ接合した外部端子の端面部分をレーザでスキャンしながら照射する上記の従来方法では、平ワッシャからはみ出した引出リードタブ部分が、レーザで溶融され外部端子と溶接されることとなるが、その部分は平ワッシャで外部端子に十分押さえこまれる部分ではないので、レーザ溶接が不安定になりやすい。   Since the flat washer used for caulking is used as a pressing plate for pressing the lead lead tab into the external terminal, the plate is thick and therefore has high heat dissipation, so it is not easy for the laser to penetrate. Further, when the laser output is increased and irradiation is performed while scanning the end face portion of the external terminal with a laser so as to penetrate the flat washer, the flat washer is broken. Therefore, in the above conventional method of irradiating the end face portion of the crimped external terminal with a laser at a power that does not cause the flat washer to break, the lead lead tab portion protruding from the flat washer is melted by the laser and the external terminal is melted. However, since this portion is not a portion that is sufficiently pressed by the external terminal with a flat washer, laser welding tends to become unstable.

本発明は、上記の課題を解決するためになされたもので、平ワッシャ等の押さえ板で引出リードタブを外部端子に押さえこみながら、引出リードタブを外部端子に十分な金属接合したアルミニウム電解コンデンサを得ることを目的としている。   The present invention has been made to solve the above problems, and obtains an aluminum electrolytic capacitor in which the lead lead tab is sufficiently metal-bonded to the external terminal while the lead lead tab is pressed against the external terminal by a pressing plate such as a flat washer. The purpose is that.

本発明は、上記の課題を解決するために、下記のアルミニウム電解コンデンサおよびその製造方法を提供するものである。
(1)電極箔から引き出され外部端子に接続される引き出しリードタブと、その引き出しリードタブを前記外部端子に押さえる押さえ板と、前記外部端子の端部に設けられた突起部に、前記引き出しリードタブと前記押さえ板とにそれぞれ設けられたはめ穴の部分がはめられ、前記突起部をかしめてかしめ接合されたアルミニウム電解コンデンサにおいて、前記押さえ板の前記はめ穴の周辺に設けられた、貫通のまたは前記引き出しリードタブの押さえ面とは反対側からへこんだ非貫通の溶接用孔部と、この溶接用孔部の孔軸方向で、前記引き出しリードタブと前記外部端子との間に設けた溶接部とを有することを特徴とするアルミニウム電解コンデンサ。
(2)電極箔から引き出され外部端子に接続される引き出しリードタブと、その引き出しリードタブを前記外部端子に押さえる押さえ板と、前記外部端子の端部に設けられた突起部に、前記引き出しリードタブと前記押さえ板とにそれぞれ設けられたはめ穴の部分がはめられ、前記突起部をかしめてかしめ接合されるアルミニウム電解コンデンサの製造方法において、
前記突起部をかしめてかしめ接合する工程と、前記押さえ板の前記はめ穴の周辺に、貫通のまたは前記引き出しリードタブの押さえ面とは反対側からへこんだ非貫通の溶接用孔部を設ける工程とが同時におこなわれる第一工程と、
この溶接用孔部の孔軸方向で、前記押さえ板と前記引き出しリードタブと前記外部端子との間に溶接部を設ける第二工程とを有するアルミニウム電解コンデンサの造方法。
In order to solve the above problems, the present invention provides the following aluminum electrolytic capacitor and a method for manufacturing the same.
(1) A lead lead tab drawn out from the electrode foil and connected to the external terminal, a holding plate for pressing the lead lead tab to the external terminal, a protrusion provided at an end of the external terminal, the lead lead tab and the In the aluminum electrolytic capacitor in which the portions of the fitting holes respectively provided in the holding plate are fitted and the protrusions are caulked and joined, the through holes or the drawers provided around the fitting holes of the holding plate A non-penetrating welding hole recessed from the side opposite the holding surface of the lead tab, and a weld provided between the lead lead tab and the external terminal in the hole axial direction of the welding hole. Aluminum electrolytic capacitor characterized by
(2) A lead lead tab drawn out from the electrode foil and connected to the external terminal, a holding plate for pressing the lead lead tab to the external terminal, and a protrusion provided at an end of the external terminal, the lead lead tab and the In the method of manufacturing an aluminum electrolytic capacitor in which the portions of the fitting holes respectively provided in the holding plate are fitted and the protrusions are caulked and joined,
A step of caulking and joining the protrusions, and a step of providing a through-hole or a non-through hole for welding that is recessed from a side opposite to the holding surface of the lead-out lead tab around the fitting hole of the holding plate. The first step is done at the same time,
A method for producing an aluminum electrolytic capacitor, comprising: a second step of providing a welded portion between the pressing plate, the lead-out lead tab, and the external terminal in the hole axial direction of the welding hole.

平ワッシャ等の押さえ板に貫通孔部を設け、その貫通孔部のところで、引き出しリードタブと外部端子との間に設けた接合部を有することにより、または平ワッシャ等の押さえ板の押さえ面とは反対側に非貫通孔であるへこみ部を設け、そのへこみ部と引き出しリードタブと記外部端子との間に設けた接合部を有することにより、平ワッシャ等の押さえ板で引出リードタブを外部端子に押さえこみながら、引出リードタブを外部端子に十分な金属接合がされているアルミニウム電解コンデンサを得ることができる。   By providing a through hole in a holding plate such as a flat washer and having a joint provided between the lead-out lead tab and the external terminal at the through hole, or with a holding surface of a holding plate such as a flat washer By providing a dent part that is a non-through hole on the opposite side and having a joint provided between the dent part and the lead lead tab and the external terminal, the lead lead tab is held against the external terminal by a pressing plate such as a flat washer. Thus, an aluminum electrolytic capacitor in which the lead lead tab is sufficiently metal-bonded to the external terminal can be obtained.

本発明に係るアルミニウム電解コンデンサの断面図を示している。1 shows a cross-sectional view of an aluminum electrolytic capacitor according to the present invention. 本発明のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続部分を示している。The connection part of the external terminal and drawer | drawing-out lead tab of the aluminum electrolytic capacitor of this invention is shown. 本発明の別のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続部分を断面図で示している。The connection part of the external terminal and drawer | drawing-out lead tab of another aluminum electrolytic capacitor of this invention is shown with sectional drawing. 本発明のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続方法を示している。The connection method of the external terminal and drawer | drawing-out lead tab of the aluminum electrolytic capacitor of this invention is shown. 本発明の別のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続方法を示している。The connection method of the external terminal and drawer | drawing-out lead tab of another aluminum electrolytic capacitor of this invention is shown.

本発明に述べる電極箔は、アルミニウム電解コンデンサの陽極と陰極とに使用される一般的な電極箔で、主にアルミニウムからなる。
陽極は、厚さ50μmから150μm程度の主にアルミニウム箔を、酸水溶液中、その表面をエッチング処理し、直径が0.1μmから2μm程度のエッチングピットを設けた後、ホウ酸アンモニウム等の水溶液中で、定格電圧の1.5倍程度の電圧を印加して化成し、コンデンサとしての耐圧性の陽極酸化皮膜を形成したものである。
陰極は、厚さ20μmから100μm程度の主にアルミニウム箔をそのまま、または酸水溶液中に浸漬し、その表面をエッチング処理したものである。
The electrode foil described in the present invention is a general electrode foil used for an anode and a cathode of an aluminum electrolytic capacitor, and is mainly made of aluminum.
The anode is mainly an aluminum foil having a thickness of about 50 μm to 150 μm, the surface thereof is etched in an acid aqueous solution, an etching pit having a diameter of about 0.1 μm to 2 μm is provided, and then in an aqueous solution such as ammonium borate. Thus, a voltage of about 1.5 times the rated voltage is applied and formed to form a pressure-resistant anodized film as a capacitor.
The cathode is obtained by etching the surface of an aluminum foil having a thickness of about 20 μm to 100 μm as it is or dipped in an acid aqueous solution.

本発明に述べる引き出しリードタブは、50μmから500μm程度の厚さの主にアルミニウム箔を、短冊状に切り出したもので、一般的には、エッチングなどの粗面化加工の施されていないプレンの箔が用いられている。少なくともその表面が99.9%以上の純度のものを使用するのが好ましい。表面の純度を向上させる方法として、クラッド積層、表面蒸着またはメッキなど特に限定なく用いることができる。また、引き出しリードタブの芯となる部分は、シリコン等を添加し箔強度を上げると取り扱いが容易になる。また、陽極側の引き出しリードタブについては、陽極酸化が施されたものも使用される。   The lead lead tab described in the present invention is obtained by cutting out an aluminum foil having a thickness of about 50 μm to 500 μm into a strip shape. Is used. It is preferable to use a material having a purity of at least 99.9% on the surface. As a method for improving the purity of the surface, cladding lamination, surface vapor deposition, plating or the like can be used without any particular limitation. Further, the core portion of the lead lead tab can be easily handled by adding silicon or the like to increase the foil strength. As the lead-out lead tab on the anode side, anodized one is used.

本発明に述べる外部端子は、コンデンサケースの封口板にあって、封口板を貫通する端子で、引き出しリードタブと外部回路を電気的につなぐものである。主にアルミニウムからなる。外部端子は一般にほぼ円柱形に形成されており、たとえばこの外側面の中程に鍔が形成され、この鍔の部分が封口板に埋設される。また、一般には、外部端子の外側の端面には、ネジ穴が形成されたネジ端子となっている。外部端子の他端には、引き出しリードタブを接続固定するための接続部を設ける。この接続部として、外部端子の径よりも細くした突起部を設け、引き出しリータブドの端部に穴をあけてその突起部に差し込み、次に押さえ板としての平ワッシャを差し込み、機械的にかしめるかしめ接合をする。この突起部は、たとえば柱形に形成されており、加工上柱状体の軸と同じ軸方向にあるのが好ましい。また、突起部の径は、太いほど突起部に差し込む押さえ板を固定しやすいが、太すぎると押さえ板自体の押さえ面積が減少する。
外部端子の直径はおおよそ0.5cmから2cm程度で、突起部の直径は、外部端子の直径の4分の1から半分程度となっている。
The external terminal described in the present invention is a terminal penetrating the sealing plate on the sealing plate of the capacitor case, and electrically connects the lead lead tab and the external circuit. Mainly made of aluminum. The external terminal is generally formed in a substantially cylindrical shape. For example, a ridge is formed in the middle of the outer surface, and the ridge portion is embedded in the sealing plate. In general, a screw terminal having a screw hole is formed on the outer end face of the external terminal. At the other end of the external terminal, a connection portion for connecting and fixing the lead lead tab is provided. As this connection part, a projection part thinner than the diameter of the external terminal is provided, a hole is made in the end part of the drawer leaded tab and inserted into the projection part, and then a flat washer as a holding plate is inserted and mechanically caulked. Caulking and joining. This protrusion is formed in, for example, a column shape, and is preferably in the same axial direction as the axis of the processed columnar body. Further, the larger the diameter of the protruding portion, the easier it is to fix the pressing plate inserted into the protruding portion, but if it is too thick, the pressing area of the pressing plate itself decreases.
The diameter of the external terminal is about 0.5 cm to 2 cm, and the diameter of the protrusion is about a quarter to half of the diameter of the external terminal.

本発明に述べる押さえ板は、引き出しリードタブの表面に設け、引き出しリードタブを外部端子に押さえ込む板で、引き出しリードタブとともに、中央に差し込み穴を設け、外部端子の端面に設けた突起部に差し込み、突起部をかしめて押さえ込む。一般的には厚さが0.5mmから5mm程度のアルミニウム製で、より強度を得るためには、シリコン、マグネシウム等を添加する。形状は、外部端子の端面と同形となるが、一般的には、方向性のない円盤系の場合平ワッシャと呼ばれ、中央にはめ穴を設けたものとなる。   The holding plate described in the present invention is a plate that is provided on the surface of the lead lead tab and presses the lead lead tab to the external terminal. Along with the lead lead tab, an insertion hole is provided in the center, and is inserted into the protrusion provided on the end surface of the external terminal. Squeeze and hold down. In general, it is made of aluminum having a thickness of about 0.5 mm to 5 mm, and silicon, magnesium, etc. are added in order to obtain higher strength. The shape is the same as that of the end face of the external terminal. Generally, in the case of a disk system having no directionality, it is called a flat washer and has a center hole.

本発明に述べる溶接用孔部は、押さえ板に設ける貫通または非貫通の穴で、押さえ板の中央部分に設ける差し込み穴の周辺部分に1つ以上複数設けるが、多いほど押さえ板の押さえつけ強度が減少する。非貫通のへこみ穴の場合は、引き出しリードタブの押さえ面とは反対側からへこんでいる。
溶接用孔部は、押さえ板が円盤の場合、円盤の直径と差し込み穴の直径との間の長さの直径の円周上に点在するもので、溶接用孔部の広さが押さえ板の内周または外周にかからないようにするほうが、押さえ板の強度の点で好ましい。押さえ板が円盤でない場合も円盤と同様に中間に溶接用孔部を点在させる。また、溶接用孔部の広さが押さえ板の外周にかからないようにするために、絶縁等に問題がなければ、押さえ板の直径は外部端子の直径よりも大きいほうが押さえ板の強度の点で好ましい。
また、溶接用孔部は、押さえ板を外部端子に差し込まれる前に設けると、溶接用孔部の量産には好ましいが、その後の工程である溶接の場所の位置検索が困難になりやすい。この場合には、押さえ板を外部端子に差し込んだ後に加工されるのが好ましい。外部端子突起部をかしめてかしめ接合する工程と同時に溶接用孔部を設けると、工程数がその分減少し好ましい。
押さえ板を外部端子に差し込まれた後、溶接用孔部を設ける場合には、先が丸いまたは特に先がとがった円錐状の治具を使用して押さえ板に押し込み加工すると穿孔性の点で好ましい。
The welding hole described in the present invention is a through or non-through hole provided in the holding plate, and one or more holes are provided in the peripheral portion of the insertion hole provided in the central portion of the holding plate. Decrease. In the case of a non-through hole, it is recessed from the side opposite to the holding surface of the lead tab.
When the pressing plate is a disk, the welding holes are scattered on the circumference of the diameter between the diameter of the disk and the diameter of the insertion hole, and the width of the welding hole is the pressing plate. It is preferable from the viewpoint of the strength of the pressing plate that the inner periphery or the outer periphery of the pressing plate is not applied. Even when the pressing plate is not a disk, welding holes are dotted in the middle as in the disk. In addition, in order to prevent the width of the welding hole from reaching the outer periphery of the pressing plate, if there is no problem with insulation, the pressing plate has a larger diameter than the external terminal in terms of the strength of the pressing plate. preferable.
Further, when the welding hole is provided before the pressing plate is inserted into the external terminal, it is preferable for mass production of the welding hole, but it is difficult to search the position of the welding place in the subsequent process. In this case, it is preferable that the pressing plate is processed after being inserted into the external terminal. It is preferable to provide a hole for welding simultaneously with the step of caulking and joining the external terminal protrusions, and the number of steps is reduced accordingly.
When a hole for welding is provided after the press plate is inserted into the external terminal, it can be punched if it is pressed into the press plate using a circular or especially conical jig with a pointed tip. preferable.

引き出しリードタブと外部端子間溶接は、この溶接用孔部の孔軸方向でおこなわれる。溶接法としては、アーク溶接、超音波溶接、または抵抗溶接等、特に限定なく使用できる。押さえ板の溶接用孔部が貫通孔の場合、溶接部は、引き出しリードタブと外部端子との間で形成される。押さえ板の溶接用孔部が非貫通孔の場合、溶接部は、押さえ板と引き出しリードタブと外部端子との間にまたがって形成され好ましい。
レーザ溶接の場合、先がとがった円錐状の治具を使用することにより、押さえ板の溶接用孔部が先がつぼまった穴の場合、レーザの直径が貫通孔の側面にかかると、レーザがかかった側面部分も溶けるので、溶接部は、押さえ板と引き出しリードタブと外部端子との間にまたがって形成される。
The welding between the lead lead tab and the external terminal is performed in the hole axial direction of the hole for welding. As a welding method, arc welding, ultrasonic welding, resistance welding, or the like can be used without particular limitation. When the welding hole of the pressing plate is a through hole, the weld is formed between the lead lead tab and the external terminal. When the hole for welding of the pressing plate is a non-through hole, the welded portion is preferably formed across the pressing plate, the lead lead tab, and the external terminal.
In the case of laser welding, if a conical jig with a pointed tip is used, the welding hole of the holding plate is a hole with a pointed tip, and if the diameter of the laser is applied to the side surface of the through hole, Since the side portion on which the crack is applied is melted, the welded portion is formed across the pressing plate, the lead lead tab, and the external terminal.

以下、本発明の実施の形態を図面に基づいて説明する。
図1は、本発明に係るアルミニウム電解コンデンサの断面図を示している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a cross-sectional view of an aluminum electrolytic capacitor according to the present invention.

本発明に係るアルミニウム電解コンデンサは、表面をエッチング処理し化成による酸化膜を形成した陽極箔と、表面をエッチング処理し酸化膜を形成しない、あるいは低圧化成による酸化膜を形成した陰極箔とを電解紙等のセパレータを介して巻き回したコンデンサ素子1に電解液を含浸し、このコンデンサ素子1をケース2内に収納後、陽極箔および陰極箔から引き出した引き出しリードタブ3を、封口板4を貫通する外部端子5にそれぞれ接続し、封口板4をケース2に取り付けて密閉した構造になっている。また、ケース2の外側面には、絶縁性の外装スリーブ6を設けている。
外部端子5は柱状で断面が円形のものが加工しやすい。また外部端子5には、引き出しリードタブ3と接続する端面に突起部7を設ける。突起部7には必要な数の引き出しリードタブ3とそれを押さえる押さえ板8が差し込まれ、かしめ加工される。突起部7の直径は、外部端子1の直径の1/5から1/2が好ましく、外部端子1の直径の1/5よりも小さいと押さえ込む強度が取れにくくなり、外部端子1の直径の1/2より大きいと押さえ込む面積が減少しやすい。
また、押さえ板8には、突起部7の差し込み穴の周辺に、貫通のまたは引き出しリードタブ3の押さえ面側で非貫通の溶接用孔部9を設け、この溶接用孔部9の孔軸方向で、引き出しリードタブと3外部端子1との間に溶接部10を設ける。
The aluminum electrolytic capacitor according to the present invention electrolyzes an anode foil whose surface is etched to form an oxide film by chemical conversion and a cathode foil whose surface is etched to form no oxide film, or oxide film formed by low pressure chemical formation. Capacitor element 1 wound through a separator such as paper is impregnated with an electrolytic solution, and after this capacitor element 1 is stored in case 2, lead-out lead tab 3 drawn out from the anode foil and cathode foil passes through sealing plate 4. The sealing plate 4 is attached to the case 2 and hermetically sealed. In addition, an insulating outer sleeve 6 is provided on the outer surface of the case 2.
The external terminal 5 having a columnar shape and a circular cross section is easy to process. Further, the external terminal 5 is provided with a projection 7 on an end face connected to the lead lead tab 3. A necessary number of lead lead tabs 3 and a pressing plate 8 for pressing the tabs are inserted into the protrusion 7 and are caulked. The diameter of the protrusion 7 is preferably 1/5 to 1/2 of the diameter of the external terminal 1. If the diameter is smaller than 1/5 of the diameter of the external terminal 1, the pressing strength is difficult to obtain. If it is larger than / 2, the area to be pressed down tends to decrease.
Further, the pressing plate 8 is provided with a welding hole 9 that is penetrating or not penetrating on the pressing surface side of the lead-out lead tab 3 around the insertion hole of the protrusion 7. Thus, the welded portion 10 is provided between the lead lead tab and the 3 external terminal 1.

図2は、本発明のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続部分を示している。図2(a)は、断面図を、図2(b)は、上面図を示している。
外部端子5の突起部7に、必要な数の引き出しリードタブ3とそれを押さえる押さえ板8が差し込まれ、かしめ加工されている。また、押さえ板8には、突起部7への差し込み穴の周辺に、引き出しリードタブ3の押さえ面側で非貫通の溶接用孔部9を設け、この溶接用孔部9の孔軸方向で、押さえ板8と引き出しリードタブ3と外部端子5との間に溶接部10を設けて接合している。
また、溶接用孔部9の直径が大きいほど、溶接部10の面積が増加するが、押さえ板の押さえつけ強度が減少するため、外部端子間の絶縁に支障がない範囲で、押さえ板の直径を増加させるのが好ましい。
FIG. 2 shows a connection portion between the external terminal and the lead tab of the aluminum electrolytic capacitor of the present invention. 2A shows a cross-sectional view, and FIG. 2B shows a top view.
A necessary number of lead lead tabs 3 and a pressing plate 8 that holds the lead lead tabs 3 are inserted into the protrusions 7 of the external terminals 5 and are crimped. Further, the presser plate 8 is provided with a non-penetrating welding hole 9 on the pressing surface side of the lead-out lead tab 3 around the insertion hole to the protrusion 7, and in the hole axial direction of the welding hole 9, A welded portion 10 is provided and joined between the pressing plate 8, the lead lead tab 3 and the external terminal 5.
In addition, as the diameter of the welding hole 9 increases, the area of the welded portion 10 increases. However, since the pressing strength of the pressing plate decreases, the diameter of the pressing plate is set within a range that does not hinder insulation between the external terminals. It is preferable to increase.

図3は、本発明の別のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続部分を断面図で示している。
図2と同様に外部端子5の突起部7に、必要な数の引き出しリードタブ3とそれを押さえる押さえ板8が差し込まれ、かしめ加工されている。また、押さえ板8には、突起部7に差し込まれる差し込み穴の周辺に、貫通の溶接用孔部9を設け、この溶接用孔部9の軸方向で、引き出しリードタブ3と外部端子5との間に溶接部10を設けて接合している。
FIG. 3 is a sectional view showing a connection portion between an external terminal and a lead lead tab of another aluminum electrolytic capacitor of the present invention.
As in FIG. 2, a necessary number of lead lead tabs 3 and a pressing plate 8 that holds the lead lead tabs 3 are inserted into the protrusions 7 of the external terminals 5 and are crimped. Further, the presser plate 8 is provided with a through-hole 9 for welding around the insertion hole inserted into the protrusion 7, and the lead-out lead tab 3 and the external terminal 5 are connected in the axial direction of the hole 9 for welding. The welding part 10 is provided between them and joined.

図4は、本発明のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続方法を示している。図4(a)は、かしめ前の状態を、図4(b)は、かしめ直後の状態を、図4(c)は、溶接直後の状態を示している。
まず、図4(a)に示すように、外部端子5の端面に設けた突起部7に、必要な数の引き出しリードタブ3とそれを押さえる押さえ板8を差し込む。このとき、引き出しリードタブ3と押さえ板8とには差し込み用の差し込み穴を設けておく。
次に、図4(b)に示すように、かしめ部11と溶接用孔部9が同時に形成できる型治具12により、外部端子5の端面上方から押しつけてかしめ部11と溶接用孔部9である非貫通のへこみを設ける。このとき、この型治具12の端面外周には押さえ板8が外側に広がらないように、ダム状のストッパー部13を設けるのが好ましい。
次に、図4(c)に示すように、溶接用孔部9と、かしめ部11とは反対側の外部端子5の端面間で抵抗溶接用の電極14をはさんで、押さえ板8と引き出しリードタブ3と外部端子5との間に溶接部10を設ける。
FIG. 4 shows a method for connecting the external terminal of the aluminum electrolytic capacitor of the present invention to the lead-out lead tab. 4A shows a state before caulking, FIG. 4B shows a state immediately after caulking, and FIG. 4C shows a state immediately after welding.
First, as shown in FIG. 4A, a required number of lead-out lead tabs 3 and a pressing plate 8 for holding them are inserted into the protrusions 7 provided on the end face of the external terminal 5. At this time, the lead-out lead tab 3 and the holding plate 8 are provided with insertion holes for insertion.
Next, as shown in FIG. 4 (b), the caulking portion 11 and the welding hole 9 are pressed from above the end surface of the external terminal 5 by the mold jig 12 that can simultaneously form the caulking portion 11 and the welding hole 9. Provide a non-penetrating dent. At this time, it is preferable to provide a dam-like stopper portion 13 on the outer periphery of the end face of the mold jig 12 so that the pressing plate 8 does not spread outward.
Next, as shown in FIG. 4C, the welding plate 9 is sandwiched between the end face of the welding terminal 9 and the external terminal 5 on the side opposite to the caulking part 11, and the holding plate 8 A welded portion 10 is provided between the lead lead tab 3 and the external terminal 5.

図5は、本発明の別のアルミニウム電解コンデンサの外部端子と引き出しリードタブとの接続方法を示している。図5(a)は、かしめ直後の状態を、図5(b)は、溶接開始の状態を、図5(c)は、溶接後の状態を示している。
まず、図4(a)に示すのと同様にように、外部端子5の端面に設けた突起部7に、必要な数の引き出しリードタブ3とそれを押さえる押さえ板8を差し込む。このとき、引き出しリードタブ3と押さえ板8とには差し込み穴を設けておく。
次に、図5(a)に示すように、かしめ部11と溶接用孔部9が同時に形成できる型治具12により、外部端子5の端面上方から押しつけてかしめ部11と溶接用孔部9である貫通孔を設ける。この場合の型治具12の溶接用孔部9の形成部分の形状は、先がとがった円錐状になっている。そのため、できた押さえ板8の溶接用孔部9もまた先がつぼまった形状となる。
次に、図4(b)に示すように、レーザ光15の直径を溶接用孔部9の中間程度の直径として照射する。
次に、図4(c)に示すように、その結果、押さえ板8の溶接用孔部9のつぼまった部分も溶融して結果として、押さえ板8と引き出しリードタブ3と外部端子5との間に溶接部10が設けられる。
FIG. 5 shows a method of connecting an external terminal and a lead lead tab of another aluminum electrolytic capacitor of the present invention. FIG. 5A shows a state immediately after caulking, FIG. 5B shows a state where welding is started, and FIG. 5C shows a state after welding.
First, as shown in FIG. 4A, a required number of lead lead tabs 3 and a pressing plate 8 for holding them are inserted into the protrusions 7 provided on the end face of the external terminal 5. At this time, an insertion hole is provided in the lead lead tab 3 and the holding plate 8.
Next, as shown in FIG. 5 (a), the caulking portion 11 and the welding hole 9 are pressed from above the end surface of the external terminal 5 with a mold jig 12 that can simultaneously form the caulking portion 11 and the welding hole 9. A through hole is provided. In this case, the shape of the forming portion of the welding hole 9 of the mold jig 12 is a conical shape with a sharp point. Therefore, the hole 9 for welding of the presser plate 8 thus formed also has a shape with a pointed tip.
Next, as shown in FIG. 4 (b), the laser beam 15 is irradiated with a diameter about the middle of the welding hole 9.
Next, as shown in FIG. 4C, as a result, the swelled portion of the welding hole 9 of the pressing plate 8 is also melted. As a result, the pressing plate 8, the lead lead tab 3, and the external terminal 5 A weld 10 is provided between them.

1…コンデンサ素子、2…ケース、3…引き出しリードタブ、4…封口板、5…外部端子、6…外装スリーブ、7…突起部、8…押さえ板、9…溶接用孔部、10…溶接部、11…かしめ部、12…型治具、13…ダム状のストッパー部、14…電極、15…レーザ光   DESCRIPTION OF SYMBOLS 1 ... Capacitor element, 2 ... Case, 3 ... Lead-out tab, 4 ... Sealing plate, 5 ... External terminal, 6 ... Exterior sleeve, 7 ... Projection part, 8 ... Holding plate, 9 ... Welding hole part, 10 ... Welding part DESCRIPTION OF SYMBOLS 11 ... Caulking part, 12 ... Mold jig, 13 ... Dam-shaped stopper part, 14 ... Electrode, 15 ... Laser beam

Claims (2)

電極箔から引き出され外部端子に接続される引き出しリードタブと、その引き出しリードタブを前記外部端子に押さえる押さえ板と、前記外部端子の端部に設けられた突起部に、前記引き出しリードタブと前記押さえ板とにそれぞれ設けられたはめ穴の部分がはめられ、前記突起部をかしめてかしめ接合されたアルミニウム電解コンデンサにおいて、前記押さえ板の前記はめ穴の周辺に設けられた、貫通のまたは前記引き出しリードタブの押さえ面とは反対側からへこんだ非貫通の溶接用孔部と、この溶接用孔部の孔軸方向で、前記引き出しリードタブと前記外部端子との間に設けた溶接部とを有することを特徴とするアルミニウム電解コンデンサ。   A lead lead tab drawn out from the electrode foil and connected to the external terminal, a pressing plate for pressing the lead lead tab to the external terminal, a protrusion provided at an end of the external terminal, the lead lead tab and the pressing plate In the aluminum electrolytic capacitor in which the fitting hole portions respectively provided are fitted and the protrusions are caulked and joined, the penetrating or holding of the lead-out lead tab provided around the fitting hole of the pressing plate A non-penetrating welding hole recessed from the opposite side of the surface, and a weld provided between the lead-out lead tab and the external terminal in the hole axial direction of the welding hole. Aluminum electrolytic capacitor to be used. 電極箔から引き出され外部端子に接続される引き出しリードタブと、その引き出しリードタブを前記外部端子に押さえる押さえ板と、前記外部端子の端部に設けられた突起部に、前記引き出しリードタブと前記押さえ板とにそれぞれ設けられたはめ穴の部分がはめられ、前記突起部をかしめてかしめ接合されるアルミニウム電解コンデンサの製造方法において、
前記突起部をかしめてかしめ接合する工程と、前記押さえ板の前記はめ穴の周辺に、貫通のまたは前記引き出しリードタブの押さえ面とは反対側からへこんだ非貫通の溶接用孔部を設ける工程とが同時におこなわれる第一工程と、
この溶接用孔部の孔軸方向で、前記押さえ板と前記引き出しリードタブと前記外部端子との間に溶接部を設ける第二工程とを有するアルミニウム電解コンデンサの造方法。
A lead lead tab drawn out from the electrode foil and connected to the external terminal, a pressing plate for pressing the lead lead tab to the external terminal, a protrusion provided at an end of the external terminal, the lead lead tab and the pressing plate In the method of manufacturing an aluminum electrolytic capacitor in which the portions of the fitting holes respectively provided are fitted and the protrusions are caulked and joined,
A step of caulking and joining the protrusions, and a step of providing a through-hole or a non-through hole for welding that is recessed from a side opposite to the holding surface of the lead-out lead tab around the fitting hole of the holding plate. The first step is done at the same time,
A method for producing an aluminum electrolytic capacitor, comprising: a second step of providing a welded portion between the pressing plate, the lead-out lead tab, and the external terminal in the hole axial direction of the welding hole.
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JPH09108874A (en) * 1995-10-13 1997-04-28 Matsushita Electric Works Ltd Laser welding method
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