JP2018041959A - Lead wire terminal and electrolytic capacitor - Google Patents

Lead wire terminal and electrolytic capacitor Download PDF

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JP2018041959A
JP2018041959A JP2017165628A JP2017165628A JP2018041959A JP 2018041959 A JP2018041959 A JP 2018041959A JP 2017165628 A JP2017165628 A JP 2017165628A JP 2017165628 A JP2017165628 A JP 2017165628A JP 2018041959 A JP2018041959 A JP 2018041959A
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lead wire
electrolytic capacitor
rod
wire terminal
terminal
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JP7168185B2 (en
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壮志 中村
Soji Nakamura
壮志 中村
英一 谷
Hidekazu Tani
英一 谷
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Kohoku Kogyo Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/13—Energy storage using capacitors

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Abstract

PROBLEM TO BE SOLVED: To suppress a leak current owing to a crack in an oxide film in a hybrid type electrolytic capacitor or solid electrolytic capacitor.SOLUTION: A lead wire terminal is used as an electrode of a hybrid type electrolytic capacitor or solid electrolytic capacitor. The lead wire terminal comprises: a tab terminal 10 into which is shaped by pressing a metal rod with its outer surface covered with a first oxide film; and a lead wire 20 connected to one end of the tab terminal. The tab terminal has a rod-like part 11 on one-end side, and a rolled part 12 on the other end side. A whole outer surface of the rolled part, and an outer surface of a portion located on the side of the rolled part 12 in the rod-like part 11 is covered with a second oxide film.SELECTED DRAWING: Figure 2

Description

本発明は、ハイブリッド型電解コンデンサ又は固体電解コンデンサの電極として用いられるリード線端子の改良に関する。   The present invention relates to an improvement in a lead wire terminal used as an electrode of a hybrid electrolytic capacitor or a solid electrolytic capacitor.

周知のように、電解コンデンサ用のリード線端子は、アルミニウム等の金属棒によって形成されたタブ端子と、その一端に接続されたリード線とを備えている。タブ端子の素材である金属棒の外表面には、電流の漏洩を抑制するために、化成処理により酸化皮膜が形成されている。タブ端子は、一端側に棒状部を有するとともに他端側に圧延部を有している。圧延部は、金属棒の一部をプレス加工することにより形成されるが、その際に酸化皮膜に亀裂が生じることがある。そこで、タブ端子に二次化成処理を行い、酸化皮膜の亀裂を修復する。   As is well known, a lead wire terminal for an electrolytic capacitor includes a tab terminal formed of a metal rod such as aluminum, and a lead wire connected to one end thereof. An oxide film is formed on the outer surface of the metal rod, which is the material of the tab terminal, by chemical conversion treatment in order to suppress current leakage. The tab terminal has a rod-shaped portion on one end side and a rolled portion on the other end side. The rolled part is formed by pressing a part of the metal bar, and at that time, the oxide film may crack. Therefore, secondary chemical conversion treatment is performed on the tab terminal to repair the crack in the oxide film.

特開２００１−３０７９５２号公報JP 2001-307952 A

タブ端子に二次化成処理を行う際に、タブ端子とリード線との接続部に化成液が付着すると、この接続部が腐蝕する虞があるため、圧延部における棒状部から軸線方向に所定長さ以上離間した領域にのみ二次化成処理が施される。圧延部における棒状部側の端部は、プレス加工による塑性変形が大きい箇所であるため、とりわけ酸化皮膜に亀裂が生じやすい。この箇所には二次化成処理が施されないが、電解質が電解液のみから成る液体電解コンデンサの場合には、この箇所に電解液が接して酸化皮膜の亀裂が自己修復される。   When secondary conversion treatment is performed on the tab terminal, if the chemical conversion liquid adheres to the connection between the tab terminal and the lead wire, this connection may be corroded. The secondary chemical conversion treatment is performed only on regions that are further apart. Since the end on the rod-like part side in the rolled part is a place where plastic deformation by press working is large, cracks are particularly likely to occur in the oxide film. Although this part is not subjected to secondary chemical conversion treatment, in the case of a liquid electrolytic capacitor in which the electrolyte is composed only of an electrolytic solution, the electrolytic solution comes into contact with this part and the cracks in the oxide film are self-repaired.

しかしながら、電解質が固体電解質のみから成る固体電解コンデンサでは、酸化皮膜の亀裂が自己修復されにくいため、亀裂から電流が漏れて電解コンデンサの歩留まり率が低下するという問題がある。また、近年、低ＥＳＲ、特性安定等を目的として、電解質が固体電解質と電解液から成るハイブリッド型電解コンデンサが種々提案されている。この種の電解コンデンサでは、固体電解コンデンサよりも酸化皮膜の亀裂の自己修復性は高いものの、液体電解コンデンサに比べて自己修復性が劣る。   However, in a solid electrolytic capacitor in which the electrolyte is composed only of a solid electrolyte, the crack of the oxide film is difficult to be self-repaired, so that there is a problem that current leaks from the crack and the yield rate of the electrolytic capacitor decreases. In recent years, various types of hybrid electrolytic capacitors in which an electrolyte is composed of a solid electrolyte and an electrolytic solution have been proposed for the purpose of low ESR and characteristic stability. Although this type of electrolytic capacitor has higher self-healing capability of cracking of the oxide film than the solid electrolytic capacitor, the self-healing capability is inferior to that of the liquid electrolytic capacitor.

本発明は上記事情に鑑みて創案されたものであり、その目的は、ハイブリッド型電解コンデンサ又は固体電解コンデンサにおいて、酸化皮膜の亀裂に起因する漏れ電流を抑制することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to suppress leakage current caused by cracks in an oxide film in a hybrid electrolytic capacitor or a solid electrolytic capacitor.

上記目的を達成するために、第１の発明は、ハイブリッド型電解コンデンサ又は固体電解コンデンサの電極として用いられるリード線端子であって、外表面が第１酸化皮膜で被覆された金属棒をプレス加工することによって成形されたタブ端子１０と、前記タブ端子１０の一端に接続されたリード線２０とを備え、前記タブ端子１０は、一端側に棒状部１１を有するとともに他端側に圧延部１２を有しており、前記圧延部１２の外表面全体及び前記前記棒状部（１１）における前記圧延部（１２）側の部位の外表面が第２酸化皮膜で被覆されている。   In order to achieve the above object, the first invention is a lead terminal used as an electrode of a hybrid electrolytic capacitor or a solid electrolytic capacitor, and presses a metal bar whose outer surface is coated with a first oxide film. And a lead wire 20 connected to one end of the tab terminal 10. The tab terminal 10 has a rod-shaped portion 11 on one end side and a rolling portion 12 on the other end side. The entire outer surface of the rolled portion 12 and the outer surface of the portion on the rolled portion (12) side of the rod-shaped portion (11) are covered with a second oxide film.

第２の発明は、前記圧延部（１２）における前記棒状部（１１）側の端部に、前記圧延部（１２）と前記棒状部（１１）の間に跨る補強リブ（１２１）が形成されているリード線端子である。   In the second invention, a reinforcing rib (121) straddling between the rolled part (12) and the rod-like part (11) is formed at an end of the rolled part (12) on the bar-like part (11) side. Lead wire terminal.

また、第３の発明は、リード線端子が取り付けられた陽極箔４１と、リード線端子が取り付けられた陰極箔４２とを、それらの間にセパレータ４３を介在させた状態で巻回することによって形成されたコンデンサ素子４０を備える電解コンデンサ１００であって、前記陽極箔４１側のリード線端子と前記陰極箔４２側のリード線端子のうち、少なくとも一方が第１の発明のリード線端子により構成されている。   Further, the third invention is to wind the anode foil 41 to which the lead wire terminal is attached and the cathode foil 42 to which the lead wire terminal is attached, with the separator 43 interposed therebetween. An electrolytic capacitor 100 including the formed capacitor element 40, wherein at least one of the lead wire terminal on the anode foil 41 side and the lead wire terminal on the cathode foil 42 side is constituted by the lead wire terminal of the first invention. Has been.

本発明によれば、ハイブリッド型電解コンデンサ又は固体電解コンデンサにおいて、酸化皮膜の亀裂に起因する漏れ電流を抑制することができる。   ADVANTAGE OF THE INVENTION According to this invention, the leakage current resulting from the crack of an oxide film can be suppressed in a hybrid type electrolytic capacitor or a solid electrolytic capacitor.

本発明によるリード線端子の実施形態の斜視図である。It is a perspective view of an embodiment of a lead wire terminal by the present invention. 図１のリード線端子のタブ端子の拡大平面図である。It is an enlarged plan view of the tab terminal of the lead wire terminal of FIG. 図１のリード線端子を備えたコンデンサ素子の斜視図である。It is a perspective view of a capacitor element provided with the lead wire terminal of FIG. 図３のコンデンサ素子を備えた電解コンデンサの縦断面図である。It is a longitudinal cross-sectional view of the electrolytic capacitor provided with the capacitor | condenser element of FIG.

以下、図面を参照して本発明の実施形態を説明する。本実施形態のリード線端子１は、ハイブリッド型電解コンデンサ又は固体電解コンデンサに用いられるもので、図１に示すように、アルミニウム等から成る金属棒によって形成されたタブ端子１０と、その一端に接続されたリード線２０とを備えている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. The lead wire terminal 1 of this embodiment is used for a hybrid electrolytic capacitor or a solid electrolytic capacitor. As shown in FIG. 1, a tab terminal 10 formed by a metal rod made of aluminum or the like is connected to one end thereof. Lead wire 20 is provided.

前記金属棒は、ホウ酸やアジピン酸等を含む化成液によってあらかじめ化成処理され、外表面が酸化皮膜（以下、この酸化皮膜を「第１酸化皮膜」と称する。）で被覆されている。タブ端子１０は、前記金属棒をプレス加工することにより成形され、一端側に棒状部１１を有するとともに他端側に圧延部１２を有している。   The metal rod is previously subjected to a chemical conversion treatment with a chemical conversion solution containing boric acid, adipic acid or the like, and the outer surface is coated with an oxide film (hereinafter, this oxide film is referred to as “first oxide film”). The tab terminal 10 is formed by pressing the metal rod, and has a rod-shaped portion 11 on one end side and a rolled portion 12 on the other end side.

前記棒状部１１の一端には、溶接等によってリード線２０が接続されている。リード線２０は、例えば、鉄線の外周面に銅層を設けたＣＰ線によって形成される。圧延部１２は、前記金属棒の一部を平板状にプレス加工するとともに、その外周を厚み方向に沿って切断することにより形成される。本実施形態では、圧延部１２全体の外表面と、棒状部１１における圧延部側の部位の外表面とが、ホウ酸やアジピン酸等を含む化成液によって二次化成処理されている。   A lead wire 20 is connected to one end of the rod-like portion 11 by welding or the like. The lead wire 20 is formed by, for example, a CP wire in which a copper layer is provided on the outer peripheral surface of an iron wire. The rolling part 12 is formed by pressing a part of the metal bar into a flat plate shape and cutting the outer periphery along the thickness direction. In the present embodiment, the outer surface of the entire rolled portion 12 and the outer surface of the portion on the rolled portion side of the rod-shaped portion 11 are subjected to secondary chemical conversion treatment with a chemical conversion solution containing boric acid, adipic acid, or the like.

図２において、実線のハッチングは、二次化成処理が施される領域を表しており、この領域には、二次化成処理による酸化皮膜（以下、この酸化皮膜を「第２酸化皮膜」と称する。）が形成されている。棒状部１１の二次化成処理は、棒状部１１における圧延部１２側の端面から棒状部１１の軸線方向に所定長さＬ１離間した位置まで施される。   In FIG. 2, the solid hatching indicates a region where the secondary chemical conversion treatment is performed, and this region includes an oxide film formed by the secondary chemical conversion treatment (hereinafter, this oxide film is referred to as a “second oxide film”). .) Is formed. The secondary chemical conversion treatment of the rod-shaped portion 11 is performed from the end surface of the rod-shaped portion 11 on the rolled portion 12 side to a position separated by a predetermined length L1 in the axial direction of the rod-shaped portion 11.

本実施形態では、Ｌ１は棒状部１１の軸線方向の全長の略１／２に設定されているが、Ｌ１の長さは特に限定されない。棒状部１１とリード線２０の接続部に化成液が付着するのを抑制するために、Ｌ１は棒状部１１の軸線方向の全長の１／２以下であることが好ましい。   In the present embodiment, L1 is set to approximately ½ of the total length of the rod-shaped portion 11 in the axial direction, but the length of L1 is not particularly limited. In order to prevent the chemical conversion liquid from adhering to the connecting portion between the rod-shaped portion 11 and the lead wire 20, L1 is preferably equal to or less than ½ of the total length of the rod-shaped portion 11 in the axial direction.

また、本実施形態では、棒状部１１と圧延部１２の間に跨る補強リブ１２１が形成されている。補強リブ１２１は、棒状部１１における圧延部１２側の端面と圧延部１２の一方の面とに接続され、平面視略半円状を呈している。   Moreover, in this embodiment, the reinforcing rib 121 straddling between the rod-shaped part 11 and the rolling part 12 is formed. The reinforcing rib 121 is connected to the end surface of the rod-shaped portion 11 on the rolled portion 12 side and one surface of the rolled portion 12, and has a substantially semicircular shape in plan view.

このリード線端子１では、圧延部１２の外表面の全体に二次化成処理が施され、補強リブ１２１及びその他の箇所の第１酸化皮膜に生じた亀裂を修復することができるので、漏れ電流を抑制することができる。   In this lead wire terminal 1, secondary conversion treatment is performed on the entire outer surface of the rolled portion 12, and cracks generated in the first oxide film at the reinforcing rib 121 and other portions can be repaired. Can be suppressed.

また、このリード線端子１では、棒状部１１の外表面の一部まで化成液に浸漬するため、棒状部１１の外表面に生じた第１酸化皮膜の亀裂も修復することができるので、圧延部１２のみを化成液に浸漬する場合と比べて漏れ電流の発生が低減する。   In addition, since the lead wire terminal 1 is immersed in the chemical conversion solution up to a part of the outer surface of the rod-shaped portion 11, cracks in the first oxide film generated on the outer surface of the rod-shaped portion 11 can be repaired. The generation of leakage current is reduced as compared with the case where only the portion 12 is immersed in the chemical conversion solution.

圧延部１２の外表面全体及び棒状部１１における圧延部１２に隣接する部位の外表面に第２酸化皮膜を形成する方法としては、例えば、複数本のリード線端子１を束ねた状態で化成液に浸漬する方法や、複数本のリード線端子１を長手方向に直交する方向に離間させた状態で治具に固定し、治具を下降させて各リード線端子１を化成液に浸漬する方法等がある。   As a method for forming the second oxide film on the entire outer surface of the rolling part 12 and the outer surface of the part adjacent to the rolling part 12 in the rod-like part 11, for example, a chemical conversion liquid in a state where a plurality of lead wire terminals 1 are bundled. Or a method in which a plurality of lead wire terminals 1 are fixed to a jig in a state of being separated in a direction perpendicular to the longitudinal direction, and the jig is lowered to immerse each lead wire terminal 1 in a chemical conversion solution. Etc.

なお、車載用の機器に使用される電解コンデンサは、安全性の向上のために特に高い信頼性が要求されるが、圧延部１２の外表面全体及び棒状部１１における圧延部１２に隣接する部位の外表面を二次化成処理することにより、かかる厳しい品質要求に応じた高品質の電解コンデンサを提供することができる。   The electrolytic capacitor used in the on-vehicle equipment is required to have particularly high reliability in order to improve safety, but the entire outer surface of the rolling part 12 and the part adjacent to the rolling part 12 in the rod-like part 11 By subjecting the outer surface to secondary chemical conversion treatment, it is possible to provide a high-quality electrolytic capacitor that meets such strict quality requirements.

化成液に浸漬されたリード線端子１は、純水で洗浄され、脱水された後、乾燥機で乾燥される。このようにして製造されたリード線端子１を、コンデンサ素子の素材である陽極箔と陰極箔とにそれぞれ取り付け、図３に示すように、陽極箔４１と陰極箔４２とを、それらの間にセパレータ４３を介在させた状態で巻回してコンデンサ素子４０を形成する。そして、公知の方法により、陽極箔４１と陰極箔４２との間に固体電解質層（図示せず）を形成する。   The lead wire terminal 1 immersed in the chemical liquid is washed with pure water, dehydrated, and then dried with a dryer. The lead wire terminal 1 manufactured in this way is attached to the anode foil and the cathode foil which are materials of the capacitor element, respectively, and as shown in FIG. 3, the anode foil 41 and the cathode foil 42 are placed between them. The capacitor element 40 is formed by winding with the separator 43 interposed therebetween. Then, a solid electrolyte layer (not shown) is formed between the anode foil 41 and the cathode foil 42 by a known method.

コンデンサ素子４０の端面から突出している一対のリード線２０を円盤状の封口体５０（図４参照）に形成された一対の貫通孔５１のいずれかに挿通し、コンデンサ素子４０及び封口体５０を有底円筒状の外装ケース６０に収納し、外装ケース６０の開口端を絞り加工して、封口体５０を外装ケース６０の開口端に固定する。なお、ハイブリッド型の電解コンデンサの場合には、コンデンサ素子４０に電解液を含浸させる。さらに、製品名、メーカ名等が記載された円筒状のシュリンクフィルム（図示せず）を外装ケース６０の外周に嵌着し、このシュリンクフィルムを熱収縮させることにより、電解コンデンサ１００が完成する。   The pair of lead wires 20 protruding from the end face of the capacitor element 40 is inserted into one of the pair of through holes 51 formed in the disk-shaped sealing body 50 (see FIG. 4), and the capacitor element 40 and the sealing body 50 are inserted. The sealing body 50 is housed in a bottomed cylindrical outer case 60, and the opening end of the outer case 60 is drawn to fix the sealing body 50 to the opening end of the outer case 60. In the case of a hybrid type electrolytic capacitor, the capacitor element 40 is impregnated with an electrolytic solution. Further, a cylindrical shrink film (not shown) on which the product name, manufacturer name, etc. are written is fitted to the outer periphery of the outer case 60, and the shrink film is thermally contracted, whereby the electrolytic capacitor 100 is completed.

以上、本発明の具体的な実施形態を説明したが、本発明は上記実施形態に限定されるものではない。例えば、上記実施形態では、陽極箔側のリード線端子と陰極箔側のリード線端子との両方を本発明のリード線端子としているが、いずれか一方のリード線端子のみを本発明のリード線端子としてもよい。   Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above embodiment, both the lead wire terminal on the anode foil side and the lead wire terminal on the cathode foil side are the lead wire terminals of the present invention, but only one of the lead wire terminals is the lead wire of the present invention. It may be a terminal.

また、補強リブの形状と個数は上記実施形態で示したものに限定されない。また、本発明は、補強リブを有していないリード線端子にも適用することができる。   Further, the shape and number of reinforcing ribs are not limited to those shown in the above embodiment. The present invention can also be applied to lead wire terminals that do not have reinforcing ribs.

また、リード線端子を取り付けた治具を下降させて圧延部を化成液に浸漬する代わりに、化成液が収容された槽を上昇させて圧延部を化成液に浸漬するようにしてもよい。   Further, instead of lowering the jig to which the lead wire terminal is attached and immersing the rolling part in the chemical conversion liquid, the tank containing the chemical conversion liquid may be raised to immerse the rolling part in the chemical conversion liquid.

また、上記実施形態では、金属棒の一端にリード線を接続してから金属棒をプレス加工してタブ端子を成形しているが、金属棒をプレス加工してタブ端子を成形してからタブ端子の一端にリード線を接続してもよい。   In the above embodiment, the lead wire is connected to one end of the metal rod and then the metal rod is pressed to form the tab terminal. However, the tab is formed after the metal rod is pressed to form the tab terminal. A lead wire may be connected to one end of the terminal.

その他にも、本発明の要旨を逸脱しない範囲で上記の実施形態に種々の改変を施すことができる。   In addition, various modifications can be made to the above-described embodiment without departing from the gist of the present invention.

１ リード線端子
１０ タブ端子
１１ 棒状部
１２ 圧延部
１２１ 補強リブ
２０ リード線
４０ コンデンサ素子
４１ 陽極箔
４２ 陰極箔
４３ セパレータ
５０ 封口体
６０ 外装ケース
１００ 電解コンデンサ DESCRIPTION OF SYMBOLS 1 Lead wire terminal 10 Tab terminal 11 Rod-shaped part 12 Rolled part 121 Reinforcement rib 20 Lead wire 40 Capacitor element 41 Anode foil 42 Cathode foil 43 Separator 50 Sealing body 60 Exterior case 100 Electrolytic capacitor

Claims (3)

ハイブリッド型電解コンデンサ又は固体電解コンデンサの電極として用いられるリード線端子であって、
外表面が第１酸化皮膜で被覆された金属棒をプレス加工することによって成形されたタブ端子（１０）と、
前記タブ端子（１０）の一端に接続されたリード線（２０）と
を備え、
前記タブ端子（１０）は、一端側に棒状部（１１）を有するとともに他端側に圧延部（１２）を有しており、
前記圧延部（１２）の外表面全体及び前記棒状部（１１）における前記圧延部（１２）側の部位の外表面が第２酸化皮膜で被覆されている、リード線端子。 A lead wire terminal used as an electrode of a hybrid electrolytic capacitor or a solid electrolytic capacitor,
A tab terminal (10) formed by pressing a metal bar whose outer surface is coated with a first oxide film;
A lead wire (20) connected to one end of the tab terminal (10);
The tab terminal (10) has a rod-like part (11) on one end side and a rolling part (12) on the other end side,
The lead wire terminal by which the outer surface of the site | part by the side of the said rolling part (12) in the said rolling part (12) side in the whole outer surface of the said rolling part (12) and the said rod-shaped part (11) is coat | covered with the 2nd oxide film. 前記圧延部（１２）における前記棒状部（１１）側の端部に、前記圧延部（１２）と前記棒状部（１１）の間に跨る補強リブ（１２１）が形成されている、請求項１に記載のリード線端子。   The reinforcing rib (121) straddling between the said rolling part (12) and the said rod-shaped part (11) is formed in the edge part by the side of the said rod-shaped part (11) in the said rolling part (12). Lead wire terminal described in 1. リード線端子が取り付けられた陽極箔（４１）と、リード線端子が取り付けられた陰極箔（４２）とを、それらの間にセパレータ（４３）を介在させた状態で巻回することによって形成されたコンデンサ素子（４０）を備える電解コンデンサ（１００）であって、
前記陽極箔（４１）側のリード線端子と前記陰極箔（４２）側のリード線端子のうち、少なくとも一方が請求項１又は２に記載のリード線端子により構成されている電解コンデンサ。 It is formed by winding an anode foil (41) to which a lead wire terminal is attached and a cathode foil (42) to which a lead wire terminal is attached with a separator (43) interposed therebetween. An electrolytic capacitor (100) comprising a capacitor element (40),
An electrolytic capacitor in which at least one of the lead wire terminal on the anode foil (41) side and the lead wire terminal on the cathode foil (42) side is constituted by the lead wire terminal according to claim 1 or 2.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001176753A (en) * 1999-12-20 2001-06-29 Fujitsu Media Device Kk Solid electrolytic capacitor
JP2009130339A (en) * 2007-11-28 2009-06-11 Elna Co Ltd Method for manufacturing solid electrolytic capacitor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001176753A (en) * 1999-12-20 2001-06-29 Fujitsu Media Device Kk Solid electrolytic capacitor
JP2009130339A (en) * 2007-11-28 2009-06-11 Elna Co Ltd Method for manufacturing solid electrolytic capacitor

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