JPH11168032A - Polarized aluminum electrolytic capacitor - Google Patents
Polarized aluminum electrolytic capacitorInfo
- Publication number
- JPH11168032A JPH11168032A JP9333093A JP33309397A JPH11168032A JP H11168032 A JPH11168032 A JP H11168032A JP 9333093 A JP9333093 A JP 9333093A JP 33309397 A JP33309397 A JP 33309397A JP H11168032 A JPH11168032 A JP H11168032A
- Authority
- JP
- Japan
- Prior art keywords
- lead terminal
- cathode
- electrolytic capacitor
- foil
- cathode foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はアルミニウム電解コ
ンデンサに関するものであり、とりわけ駆動用電解液
（以下、電解液という）の漏出防止処理を施した有極性
アルミニウム電解コンデンサに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electrolytic capacitor, and more particularly to a polar aluminum electrolytic capacitor which has been subjected to a treatment for preventing leakage of a driving electrolyte (hereinafter referred to as an electrolyte).
【０００２】[0002]
【従来の技術】近年デジタル回路等の発達により、アル
ミニウム電解コンデンサにおいても低損失、低インピー
ダンス特性が要求されている。これらの特性を左右する
のは、主としてコンデンサ素子に含浸される電解液であ
る。従来は電解液として、γ−ブチロラクトンやエチレ
ングリコールなどの溶媒中に、ｏ−フタル酸の４級アン
モニウム塩やマレイン酸の４級アンモニウム塩を溶質と
した電解液が用いられていた。しかしながら、上記のよ
うな４級アンモニウム塩を用いた電解液は、粘度が低
く、化学的に活性であるため、ゴム封口体とリード端子
のアルミ丸棒部との微小な間隙から漏液が発生し易いも
のであった。また、電解コンデンサを通電及び無負荷状
態で放置したとき、陰極付近の電解液が漏出し易く、基
板実装された後、陰極部より電解液が漏出し基板配線部
にショートを発生する等様々な問題があった。2. Description of the Related Art In recent years, with the development of digital circuits and the like, low loss and low impedance characteristics are also required for aluminum electrolytic capacitors. It is mainly the electrolytic solution impregnated in the capacitor element that determines these characteristics. Conventionally, as an electrolytic solution, an electrolytic solution using a quaternary ammonium salt of o-phthalic acid or a quaternary ammonium salt of maleic acid in a solvent such as γ-butyrolactone or ethylene glycol has been used. However, since the electrolyte using the quaternary ammonium salt as described above has a low viscosity and is chemically active, leakage occurs from a minute gap between the rubber sealing body and the aluminum round bar portion of the lead terminal. It was easy to do. In addition, when the electrolytic capacitor is left energized and left unloaded, the electrolyte near the cathode easily leaks, and after mounting on the board, the electrolyte leaks from the cathode and causes a short circuit in the board wiring section. There was a problem.
【０００３】[0003]
【発明が解決しようとする課題】電解コンデンサの封口
部の構造を図１に示す。リード端子の全体を図２に示
す。コンデンサ素子の陽極箔、陰極箔に加締められたリ
ード端子１は図１の１及び図２のような形態を有し、ゴ
ム封口体４の端子挿通孔５に挿入され、ゴム弾性による
嵌合圧力により気密を保持し、内部の電解液の漏出を防
ぐ構造となっている。しかしながら、前述したように、
４級アンモニウム塩を用いた電解液は、粘度が低く、化
学的に活性であるため、ゴム封口体４とリード端子１の
アルミ丸棒部７との微小な間隙から漏液が発生し易かっ
た。電解コンデンサを基板実装して通電及び無負荷状態
で放置したとき、陰極付近の電解液が漏出し、基板配線
部にショートを発生する等、様々な問題を誘発してい
た。これら陰極部分からの電解液漏出に関しては、陰極
リード端子付近の電解液が電気化学的に強アルカリにな
り、ゴム封口体４の端子挿通孔５の内面のゴム弾性の低
下が進むことが原因とされている。本発明の解決しよう
とする課題は、前記の様な４級アンモニウム塩を用いた
電解コンデンサの電解液の漏出を防ぐことである。FIG. 1 shows the structure of a sealing portion of an electrolytic capacitor. FIG. 2 shows the entire lead terminal. The lead terminal 1 crimped on the anode foil and the cathode foil of the capacitor element has a form as shown in FIGS. 1 and 2 and is inserted into the terminal insertion hole 5 of the rubber sealing body 4 and fitted by rubber elasticity. The structure maintains airtightness by pressure and prevents leakage of the electrolyte solution inside. However, as mentioned above,
Since the electrolyte using the quaternary ammonium salt has a low viscosity and is chemically active, liquid leakage easily occurs from a minute gap between the rubber sealing member 4 and the aluminum round bar portion 7 of the lead terminal 1. . When the electrolytic capacitor is mounted on a substrate and left in a state of energization and no load, various problems such as leakage of the electrolyte near the cathode and occurrence of a short circuit in the wiring portion of the substrate have been induced. The leakage of the electrolytic solution from the cathode portion is caused by the fact that the electrolytic solution near the cathode lead terminal becomes electrochemically strongly alkaline and the rubber elasticity of the inner surface of the terminal insertion hole 5 of the rubber sealing body 4 decreases. Have been. The problem to be solved by the present invention is to prevent leakage of the electrolytic solution of the electrolytic capacitor using the quaternary ammonium salt as described above.
【０００４】[0004]
【課題を解決するための手段】本発明は、陰極部からの
電解液の漏出を防ぐため各種検討した結果、見出された
ものであり、ゴム封口体４の端子挿通孔５に接するリー
ド端子１のアルミ丸棒部７と、該リード端子に接続され
ている陰極箔の電極電位差に着目したものである。従来
の有極性電解コンデンサに用いられる陰極箔は、該リー
ド端子の丸棒部より電極電位が卑であるため、該リード
端子の丸棒部と陰極箔から構成される局部電池による電
流は、陰極箔からリード端子のアルミ丸棒部に流れる。
これにより電解液が電気分解され、ゴム封口体に近いリ
ード端子のアルミ丸棒部付近で電解液のアルカリ化が進
み、ゴム弾性が低下し、電解液の漏出が発生してしま
う。この電流の向きを逆転させれば電解液の漏出は防げ
ることになるが、その方法として陰極箔に化成処理を施
し表面を酸化アルミで覆うことにより、陰極箔は該リー
ド端子のアルミ丸棒部より電極電位が貴になり、更に、
陰極リード端子の平坦部を酸化アルミで覆うことにより
平坦部もアルミ丸棒部より電極電位が貴になる。以上の
構成によりリード端子のアルミ丸棒部と、陰極箔及び陰
極リード端子の平坦部とから構成される局部電池による
電流は、リード端子のアルミ丸棒部から陰極箔及び陰極
リード端子の平坦部に流れ、該リード端子のアルミ丸棒
部におけるアルカリ化の促進を防ぐことができる。すな
わち、陽極箔と陰極箔の間に電解紙を介して巻回した素
子に、駆動用電解液を含浸し、ケースに収納してなるア
ルミニウム電解コンデンサにおいて、該駆動用電解液に
４級アンモニウム塩、イミダゾリニウム塩の少なくとも
１種を含有し、かつ化成電圧０．０５Ｖ〜５．０Ｖで化
成処理を施した陰極箔と、陰極リード端子の平坦部に化
成電圧１．０〜２００Ｖで化成処理を施した陰極リード
端子とを組み合わせて用いることを特徴とする有極性ア
ルミニウム電解コンデンサである。SUMMARY OF THE INVENTION The present invention has been found as a result of various studies to prevent leakage of the electrolyte from the cathode portion. The lead terminal is in contact with the terminal insertion hole 5 of the rubber sealing member 4. This focuses on the electrode potential difference between the aluminum round bar 7 and the cathode foil connected to the lead terminal. The cathode foil used in the conventional polar electrolytic capacitor has a lower electrode potential than the round bar portion of the lead terminal. It flows from the foil to the aluminum round bar of the lead terminal.
As a result, the electrolytic solution is electrolyzed, alkalizing of the electrolytic solution proceeds near the aluminum round bar portion of the lead terminal near the rubber sealing body, rubber elasticity decreases, and leakage of the electrolytic solution occurs. By reversing the direction of this current, leakage of the electrolyte can be prevented. The electrode potential becomes more noble,
By covering the flat portion of the cathode lead terminal with aluminum oxide, the flat portion also has a more noble electrode potential than the aluminum round bar portion. With the above configuration, the electric current generated by the local battery composed of the aluminum round bar portion of the lead terminal and the flat portion of the cathode foil and the cathode lead terminal allows the current to flow from the aluminum round bar portion of the lead terminal to the flat portion of the cathode foil and the cathode lead terminal. To promote the alkalinization of the aluminum round bar portion of the lead terminal. That is, in an aluminum electrolytic capacitor in which an element wound around an anode foil and a cathode foil via an electrolytic paper is impregnated with a driving electrolyte and housed in a case, a quaternary ammonium salt is added to the driving electrolyte. Foil containing at least one imidazolinium salt and having been subjected to a chemical conversion treatment at a chemical conversion voltage of 0.05 V to 5.0 V, and a chemical conversion treatment at a chemical conversion voltage of 1.0 to 200 V for a flat portion of the cathode lead terminal. A polarized aluminum electrolytic capacitor characterized in that it is used in combination with a cathode lead terminal provided with a negative electrode lead.
【０００５】[0005]
【作用】従来の有極性電解コンデンサに用いる陰極箔
は、該リード端子より電極電位が卑であるため、該リー
ド端子と陰極箔から構成される局部電池による電流は、
陰極箔からリード端子に流れ、ゴム封口体の端子挿通孔
のアルミ丸棒部接触部付近のアルカリ化が進行する。こ
の電流の向きを逆転させれば電解液の漏出は防げること
になるが、その方法として陰極箔に化成処理を施し、表
面を酸化アルミで覆うことにより、更に陰極リード端子
の平坦部を酸化アルミで覆うことにより、該リード端子
のアルミ丸棒部より、陰極箔及び陰極リード端子平坦部
の電極電位が貴になり、上記の局部電池による電流は、
リード端子のアルミ丸棒部から陰極箔及び陰極リード端
子の平坦部に流れ、該リード端子のアルミ丸棒部におけ
るアルカリ化の促進を防ぐことができ、ゴム封口体の端
子挿通孔の内面の弾性低下が抑えられ、電解液の漏出を
防ぐことができる。The cathode foil used in the conventional polar electrolytic capacitor has a lower electrode potential than the lead terminal.
It flows from the cathode foil to the lead terminal, and alkalizing near the aluminum round bar contact portion of the terminal insertion hole of the rubber sealing body proceeds. Reversing the direction of this current will prevent the electrolyte from leaking.However, as a method, the cathode foil is subjected to a chemical conversion treatment, and the surface is covered with aluminum oxide. By covering with the aluminum round bar portion of the lead terminal, the electrode potential of the cathode foil and the flat portion of the cathode lead terminal becomes noble, and the current by the local battery is:
It flows from the aluminum round bar portion of the lead terminal to the cathode foil and the flat portion of the cathode lead terminal, thereby preventing the alkalinization of the aluminum round bar portion of the lead terminal from being promoted, and the elasticity of the inner surface of the terminal insertion hole of the rubber sealing body. The decrease is suppressed, and leakage of the electrolyte solution can be prevented.
【０００６】ここで陰極箔および陰極リード端子平坦部
の化成電圧については、用いるリード端子の材質および
形状、電解液の種類により異なり、一概には規定できな
い。但し、リード端子のアルミ丸棒部より陰極箔表面お
よび陰極リード端子平坦部の電極電位が貴になるように
電圧設定することが必要である。本発明者らが行った実
験によると、電解液の漏出防止に効果を奏する陰極箔の
化成電圧は、１．０Ｖ以上であった。しかし、化成処理
した陰極箔と陰極リード端子平坦部を化成処理した組み
合わせでは、陰極リード端子の平坦部を１．０Ｖ以上で
化成することにより陰極箔の化成電圧を０．０５Ｖに低
下させることができる。上記組み合わせにより、電解液
の漏出防止可能な陰極箔の化成電圧を低下させることが
できるので、陰極箔の容量を低下させずに使用すること
が可能となる。有効化成電圧としては、陰極箔が０．０
５〜５．０Ｖの範囲と、陰極リード端子の平坦部が１．
０〜２００Ｖの範囲との組み合わせにおいて電解液の漏
出防止に効果がある。陰極箔の化成電圧を５．０Ｖを超
える範囲まで上げても陰極箔の容量の低下を招くだけで
効果がない。また、陰極リード端子の平坦部の化成電圧
が２００Ｖを超えると陰極箔との密着性が悪く、接触抵
抗が大きくなり製品のｔａｎδ大を招く。Here, the formation voltage of the flat portion of the cathode foil and the cathode lead terminal varies depending on the material and shape of the lead terminal used and the type of the electrolytic solution, and cannot be specified unconditionally. However, it is necessary to set the voltage so that the electrode potential on the cathode foil surface and the cathode lead terminal flat portion becomes more noble than the aluminum round bar portion of the lead terminal. According to an experiment performed by the present inventors, the formation voltage of the cathode foil that is effective in preventing leakage of the electrolytic solution was 1.0 V or more. However, in the combination in which the cathode foil subjected to the chemical treatment and the flat portion of the cathode lead terminal are subjected to the chemical treatment, the formation voltage of the cathode foil can be reduced to 0.05 V by forming the flat portion of the cathode lead terminal at 1.0 V or more. it can. According to the above combination, the formation voltage of the cathode foil capable of preventing the leakage of the electrolyte can be reduced, so that the cathode foil can be used without reducing its capacity. The effective formation voltage is 0.0
The range of 5 to 5.0 V and the flat portion of the cathode lead terminal is 1.
The combination with the range of 0 to 200 V is effective in preventing leakage of the electrolytic solution. Even if the formation voltage of the cathode foil is increased to a range exceeding 5.0 V, only a reduction in the capacity of the cathode foil is brought about and there is no effect. On the other hand, if the formation voltage of the flat portion of the cathode lead terminal exceeds 200 V, the adhesion to the cathode foil is poor, the contact resistance is increased, and the tan δ of the product is increased.
【０００７】[0007]
【実施例】γ−ブチロラクトンを主成分とする溶媒に、
テトラエチルアンモニウムのフタル酸塩を主電解質とし
て溶解させ電解液を調合した。この電解液を用いて定格
電圧２５Ｖ、静電容量２２０μＦ、ケースサイズ直径１
０ｍｍ、長さ１２．５ｍｍの電解コンデンサを作製し
た。このとき、陰極箔の化成電圧を０．０５Ｖ、１．０
Ｖ、５．０Ｖとし、陰極リード端子平坦部の化成電圧を
０．０５Ｖ、１．０Ｖ、５０Ｖ、２００Ｖとし、化成処
理を施さない陰極リード端子を用いたものも比較用とし
て作製した。上記陰極箔と陰極リード端子を用いた電解
コンデンサをそれぞれ１００個作製し、エージング処理
を施した後、８５゜Ｃ ８５％ＲＨ高温高湿雰囲気中に
て定格電圧印加、無負荷放置試験を行い、電解液の漏出
状況を確認した。その結果を表１及び表２に示す。EXAMPLE A solvent containing γ-butyrolactone as a main component was
An electrolyte was prepared by dissolving tetraethylammonium phthalate as the main electrolyte. Using this electrolyte, rated voltage 25 V, capacitance 220 μF, case size diameter 1
An electrolytic capacitor having a length of 0 mm and a length of 12.5 mm was produced. At this time, the formation voltage of the cathode foil was 0.05 V, 1.0 V
V, 5.0 V, the formation voltage of the cathode lead terminal flat portion was set to 0.05 V, 1.0 V, 50 V, and 200 V, and those using the cathode lead terminal not subjected to the formation treatment were also prepared for comparison. After producing 100 electrolytic capacitors each using the above-mentioned cathode foil and cathode lead terminal, and performing an aging treatment, a rated voltage application and a no-load storage test were performed in a high-temperature and high-humidity atmosphere at 85 ° C and 85% RH. The state of leakage of the electrolyte was confirmed. The results are shown in Tables 1 and 2.
【０００８】[0008]
【表１】 [Table 1]
【０００９】[0009]
【表２】 [Table 2]
【００１０】表１及び表２より明らかなように陰極箔の
化成電圧が０．０５Ｖの場合と陰極リード端子の化成処
理なしとの組み合わせでは充分な効果は得られなかった
が、陰極リード端子平坦部の化成電圧が１．０〜２００
Ｖの範囲のものと組み合わせると充分な効果が得られ、
電解液の漏出を防止することができる。また、リード端
子の平坦部の化成電圧が２００Ｖを超えると、陰極箔と
の接触抵抗が大きくなるだけで効果がない。更に、陰極
箔の化成電圧も５．０Ｖを超えても陰極箔の静電容量の
低下を招くだけであり効果がない。As is clear from Tables 1 and 2, the combination of the case where the formation voltage of the cathode foil was 0.05 V and the case where no formation treatment was performed on the cathode lead terminal did not provide a sufficient effect. Part formation voltage is 1.0 to 200
When combined with those in the range of V, a sufficient effect is obtained,
Electrolyte leakage can be prevented. On the other hand, when the formation voltage of the flat portion of the lead terminal exceeds 200 V, the contact resistance with the cathode foil is increased, and there is no effect. Furthermore, even if the formation voltage of the cathode foil also exceeds 5.0 V, only the decrease in the capacitance of the cathode foil is caused and there is no effect.
【００１１】[0011]
【発明の効果】以上、表１及び表２に示した様に、電解
液に４級アンモニウム塩を用いた場合、本発明の如く化
成処理を施した陰極箔と、陰極リード端子の平坦部に化
成処理を施した陰極リード端子とを組み合わせて用いる
と、漏液防止効果が明らかであり、低損失、低インピー
ダンス特性を有する電解コンデンサの作製が可能とな
り、本発明の持つ工業的、実用的価値は大なるものであ
る。As described above, as shown in Tables 1 and 2, when a quaternary ammonium salt is used for the electrolytic solution, the cathode foil subjected to the chemical conversion treatment as in the present invention and the flat portion of the cathode lead terminal are used. When used in combination with a cathode lead terminal that has been subjected to a chemical conversion treatment, the effect of preventing liquid leakage is clear, and it becomes possible to produce an electrolytic capacitor having low loss and low impedance characteristics. Is a great thing.
【図１】アルミニウム電解コンデンサを構成要素に分解
して示した分解図である。FIG. 1 is an exploded view showing an aluminum electrolytic capacitor in a disassembled state.
【図２】リード端子の全体図である。FIG. 2 is an overall view of a lead terminal.
１ リード端子 ２ アルミケース ３ コンデンサ素子 ４ ゴム封口体 ５ 端子挿通孔 ６ リード端子の平坦部 ７ リード端子のアルミ丸棒部 ８ ＣＰ線 DESCRIPTION OF SYMBOLS 1 Lead terminal 2 Aluminum case 3 Capacitor element 4 Rubber sealing body 5 Terminal insertion hole 6 Flat part of lead terminal 7 Aluminum round bar part of lead terminal 8 CP wire
Claims (1)
回した素子に、駆動用電解液を含浸し、ケースに収納し
てなるアルミニウム電解コンデンサにおいて、該駆動用
電解液に４級アンモニウム塩、イミダゾリニウム塩の少
なくとも１種を含有し、かつ化成電圧０．０５Ｖ〜５．
０Ｖで化成処理を施した陰極箔と、陰極リード端子の平
坦部に化成電圧１．０〜２００Ｖで化成処理を施した陰
極リード端子とを組み合わせて用いることを特徴とする
有極性アルミニウム電解コンデンサ。1. An aluminum electrolytic capacitor comprising a device wound between an anode foil and a cathode foil via an electrolytic paper impregnated with a driving electrolyte and housed in a case. At least one of a quaternary ammonium salt and an imidazolinium salt, and a chemical conversion voltage of 0.05 V to 5.
A polar aluminum electrolytic capacitor comprising a combination of a cathode foil subjected to a chemical conversion treatment at 0 V and a cathode lead terminal subjected to a chemical conversion treatment at a formation voltage of 1.0 to 200 V on a flat portion of the cathode lead terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9333093A JPH11168032A (en) | 1997-12-03 | 1997-12-03 | Polarized aluminum electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9333093A JPH11168032A (en) | 1997-12-03 | 1997-12-03 | Polarized aluminum electrolytic capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11168032A true JPH11168032A (en) | 1999-06-22 |
Family
ID=18262205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9333093A Pending JPH11168032A (en) | 1997-12-03 | 1997-12-03 | Polarized aluminum electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11168032A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002008945A (en) * | 2000-06-20 | 2002-01-11 | Rubycon Corp | Aluminum electrolytic capacitor |
| JP2008210823A (en) * | 2007-02-23 | 2008-09-11 | Nichicon Corp | Lead wire and electronic component including the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01319924A (en) * | 1988-06-22 | 1989-12-26 | Matsushita Electric Ind Co Ltd | Manufacture of aluminum cathode foil for electrolytic capacitor |
| JPH06310381A (en) * | 1993-04-23 | 1994-11-04 | Elna Co Ltd | Electrolytic capacitor and tab terminal thereof |
| JPH08264392A (en) * | 1995-03-17 | 1996-10-11 | Nippon Chemicon Corp | Electrolytic capacitor |
| JPH09171943A (en) * | 1995-12-19 | 1997-06-30 | Matsushita Electric Ind Co Ltd | Electrolytic solution and electrochemical element using electrolytic solution |
-
1997
- 1997-12-03 JP JP9333093A patent/JPH11168032A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01319924A (en) * | 1988-06-22 | 1989-12-26 | Matsushita Electric Ind Co Ltd | Manufacture of aluminum cathode foil for electrolytic capacitor |
| JPH06310381A (en) * | 1993-04-23 | 1994-11-04 | Elna Co Ltd | Electrolytic capacitor and tab terminal thereof |
| JPH08264392A (en) * | 1995-03-17 | 1996-10-11 | Nippon Chemicon Corp | Electrolytic capacitor |
| JPH09171943A (en) * | 1995-12-19 | 1997-06-30 | Matsushita Electric Ind Co Ltd | Electrolytic solution and electrochemical element using electrolytic solution |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002008945A (en) * | 2000-06-20 | 2002-01-11 | Rubycon Corp | Aluminum electrolytic capacitor |
| JP2008210823A (en) * | 2007-02-23 | 2008-09-11 | Nichicon Corp | Lead wire and electronic component including the same |
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