JPH0750228A - Manufacture of electrolytic capacitor - Google Patents
Manufacture of electrolytic capacitorInfo
- Publication number
- JPH0750228A JPH0750228A JP5213446A JP21344693A JPH0750228A JP H0750228 A JPH0750228 A JP H0750228A JP 5213446 A JP5213446 A JP 5213446A JP 21344693 A JP21344693 A JP 21344693A JP H0750228 A JPH0750228 A JP H0750228A
- Authority
- JP
- Japan
- Prior art keywords
- anode foil
- cut surface
- oxide film
- foil
- electrolytic capacitor
- 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.)
- Granted
Links
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- Lasers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電解コンデンサの製造方
法、とりわけ低漏れ電流で信頼性に優れた電解コンデン
サの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrolytic capacitor, and more particularly to a method for manufacturing an electrolytic capacitor having a low leakage current and excellent reliability.
【０００２】[0002]
【従来の技術】一般にアルミニウム電解コンデンサはア
ルミニウム陽極箔と陰極箔とをセパレ−タを介して巻回
してなるコンデンサ素子をケ−スに収納し、該陽極箔と
陰極箔から引き出されたリ−ドタブを外部電極端子を有
する封口端子板に接合させた後、カ−リング等の封口処
理により封口させ、エ−ジングを行いコンデンサを完成
させる。2. Description of the Prior Art Generally, an aluminum electrolytic capacitor has a case in which a capacitor element formed by winding an aluminum anode foil and a cathode foil around a separator is housed in a case, and a lead drawn from the anode foil and the cathode foil. After the dotab is joined to the sealing terminal plate having the external electrode terminals, the sealing is performed by sealing such as curling, and aging is performed to complete the capacitor.
【０００３】このエ−ジング処理の主たる目的は上記コ
ンデンサの作製中の箔切断（スリッタ−）工程での電極
箔切り口部分、リ−ド取付時の電極箔破損に伴う酸化皮
膜の破損部分、及び巻回時のストレスに伴う電極箔破損
部分などの修復陽極酸化であるが、リ−ドタブの陽極酸
化も大きな役割である。これらの陽極酸化を行わせる電
解液が、コンデンサ素子に含浸された駆動用電解液であ
る。この駆動用電解液の陽極酸化能力は非常に重要であ
り、上記の未化成部分の修復酸化皮膜はそのまま電解コ
ンデンサの特性に影響を及ぼす。The main purpose of this aging treatment is the cut portion of the electrode foil in the foil cutting (slitting) step during the production of the above-mentioned capacitor, the damaged portion of the oxide film due to the damage of the electrode foil when the lead is attached, and Although this is an anodic oxidation for repairing the damaged portion of the electrode foil due to stress during winding, the anodic oxidation of the lead tab also plays a major role. The electrolytic solution for performing these anodic oxidations is the driving electrolytic solution with which the capacitor element is impregnated. The anodic oxidation ability of the driving electrolyte is very important, and the repair oxide film on the unformed portion directly affects the characteristics of the electrolytic capacitor.
【０００４】このように駆動用電解液の陽極酸化を担う
部分は大きく分けて、陽極の電極箔とリ−ドタブの２部
分と言える。しかしながら陽極箔はエッチング処理され
ており切り口部分とはいえエッチングの影響がそのまま
残り、その表面はかなり化学的に活性な状態である。ま
た加締め、巻取りなどの生ずる酸化皮膜破損部分の修復
についても同様なことが言える。一方リ−ドタブの部分
は表面活性処理を行っていないので、その表面の化学的
活性度はエッチングされた電極箔よりはるかに低い。即
ち電極箔とリ−ドタブとでは酸化皮膜生成に伴う化学的
ポテンシャルが大きく異なり、製品のエ−ジングにて同
時に酸化皮膜生成反応を行い双方とも同時に良質な酸化
皮膜を生成させるにはかなりの無理がある。The part responsible for the anodic oxidation of the driving electrolyte is roughly divided into two parts, that is, the electrode foil of the anode and the lead tab. However, the anode foil has been subjected to etching treatment, and even though it is a cut portion, the influence of etching remains as it is, and the surface thereof is in a considerably chemically active state. The same can be said for repairing a damaged portion of an oxide film caused by caulking or winding. On the other hand, since the lead tab portion is not surface activated, the surface chemical activity is much lower than that of the etched electrode foil. In other words, the chemical potential of the oxide film formation is greatly different between the electrode foil and the lead tab, and it is quite impossible to simultaneously produce an oxide film formation reaction during aging of the product and produce a high quality oxide film at the same time. There is.
【０００５】このためリ−ドタブを予め陽極酸化させて
から用いる試みが検討されてきたが、実際にコンデンサ
に用いるリ−ドタブの幅は数ミリ程度であり、リ−ドタ
ブの表面とスリットされた切り口端面を同時に酸化皮膜
を生成させるには数ミリ幅で連続化成を行うことにな
り、生産技術的に非常に困難がある。これらのことよ
り、リ−ドタブを広幅で連続化成処理を行った後、実使
用の数ミリ幅にスリットを行い、リ−ドタブの表面だけ
に酸化皮膜を生成させ、スリット端面は未化成のまま
で、やむなく使用している場合が多い。Therefore, attempts have been made to use the lead tab after anodizing the lead tab in advance, but the width of the lead tab actually used for the capacitor is about several millimeters, and the lead tab is slit with the surface of the lead tab. In order to simultaneously form an oxide film on the cut end face, continuous chemical conversion is performed with a width of several millimeters, which is very difficult in terms of production technology. From these facts, after the lead tab was subjected to continuous chemical conversion treatment with a wide width, slits were made to a width of several millimeters in actual use, an oxide film was generated only on the surface of the lead tab, and the slit end surface remained unformed. So, I often use it.
【０００６】[0006]
【発明が解決しようとする課題】発明が解決しようとす
る課題は、電解コンデンサに用いるアルミニウムタブを
表面のみならず、スリットによる切り口端面を効率的、
かつ生産技術上無理のない方法で酸化皮膜を生成させる
手段を提示することにある。The problem to be solved by the present invention is that not only the surface of the aluminum tab used for the electrolytic capacitor but also the end surface of the cut end by the slit can be efficiently used.
Moreover, it is to present a method of forming an oxide film by a method that is not difficult in terms of production technology.
【０００７】[0007]
【課題を解決するための手段】本発明は上記の課題を解
決するために各種検討した結果見いだされたものであ
る。本発明の骨子は電解コンデンサに用いられるアルミ
ニウムリ−ドタブまたは陽極箔を生産性の良好な広幅な
アルミニウム箔を連続陽極酸化処理を行いまず表面に陽
極酸化皮膜を生成せしめた後、所定寸法にスリッタ−処
理を行いスリッタ−コイルにして巻き取り、スリッタ−
により生じた切り口面を露呈させ、水蒸気雰囲気中にて
エキシマレ−ザ−照射により該切り口部分に酸化皮膜を
生成させるものである。即ち、陽極箔と陰極箔をセパレ
−タを介して巻回してコンデンサ素子を形成し、該素子
をケ−スに収納してなる電解コンデンサにおいて、該陽
極箔より引き出されたリ−ドタブの切り口部または陽極
箔の切り口部に酸化皮膜を生成させる手段として、広幅
アルミニウムを予め連続化成工程にて陽極酸化を行った
後、所定寸法幅にてスリットし巻回されたリ−ドタブま
たは陽極箔のスリット切り口部に、水蒸気雰囲気中にて
エキシマレ−ザ−を照射することを特徴とする電解コン
デンサの製造方法である。The present invention has been found as a result of various studies for solving the above problems. The essence of the present invention is that an aluminum lead tab or an anode foil used in an electrolytic capacitor is subjected to continuous anodizing treatment of a wide aluminum foil having good productivity, and an anodic oxide film is first formed on the surface thereof, and then slittered to a predetermined size. -Processing to make slitter coil, winding, slitter-
The exposed surface of the cut surface is exposed and an oxide film is formed on the cut portion by irradiation with an excimer laser in a steam atmosphere. That is, in an electrolytic capacitor in which an anode foil and a cathode foil are wound via a separator to form a capacitor element, and the element is housed in a case, a cut portion of a lead tab pulled out from the anode foil. As a means for forming an oxide film on the cut portion of the anode part or the anode foil, after wide-width aluminum is anodized in advance in a continuous chemical conversion step, the lead tab or the anode foil of the slit or wound with a predetermined size width is wound. In the method of manufacturing an electrolytic capacitor, the slit cut portion is irradiated with an excimer laser in a water vapor atmosphere.
【０００８】[0008]
【作用】従来までアルミのリ−ドタブの切り口部分の陽
極酸化は所定寸法幅にスリット処理を行い巻き取りスリ
ットコイルにしてから電解液中に浸漬させアルミのリ−
ドタブを陽極として電解を行なう方法の検討が行われて
きた。しかしながらスリットコイル内部まで電解液が浸
透し、予め表面に生成していた陽極酸化皮膜が劣化され
てしまうという不都合があった。これはスリット後の巻
き取り時にいくら固巻きしても電解液の浸透性の方が強
くどうしても避けられないものである。本発明はエキシ
マレ−ザ−照射による上記切り口未化成部分への酸化皮
膜の生成を図ったものであるが、通常の大気雰囲気では
生成される酸化皮膜はどうしても対電気耐圧が低いもの
となった。エキシマレ−ザ−による酸化は紫外線による
アルミと酸素の励起により生ずるものであり、電気化学
的な陽極酸化とは異なる。従って、電気的な耐圧を有す
る皮膜にするには水和皮膜と酸化皮膜の混合皮膜さらに
は一部結晶化している必要がある。こうした酸化皮膜生
成の検討を行ったところ水蒸気雰囲気でエキシマレ−ザ
−照射を行えば上記のような電気的な耐圧を有する酸化
皮膜を作ることができた。この理由については明確なこ
とが判明していないが恐らく、水蒸気に紫外線レ−ザ−
が当たることにより水が励起分解してＯＨイオンとなり
励起されたアルミと結合してＡｌ（ＯＨ）3 もしくはＡ
ｌＯＯＨが一部生じ、さらに一部のＡｌＯＯＨが結晶に
転移したものと考えられる。[Function] Conventionally, the anodic oxidation of the cut portion of the aluminum lead tab is performed by slitting to a predetermined size width to form a winding slit coil and then immersing it in the electrolytic solution.
Studies have been conducted on a method of performing electrolysis using a dotab as an anode. However, there is a disadvantage that the electrolytic solution permeates into the inside of the slit coil and the anodic oxide film formed on the surface in advance is deteriorated. This is unavoidable because the permeability of the electrolytic solution is stronger, no matter how much it is tightly wound during winding after slitting. The present invention is intended to form an oxide film on the above-mentioned uncut portion not yet formed by excimer laser irradiation. However, the oxide film formed in a normal atmosphere has a low withstand voltage. Excimer laser oxidation is caused by the excitation of aluminum and oxygen by ultraviolet rays, and is different from electrochemical anodic oxidation. Therefore, in order to obtain a film having an electrical withstand voltage, it is necessary that a mixed film of a hydrated film and an oxide film, and partly crystallized. As a result of studying the formation of such an oxide film, it was possible to form an oxide film having the above electrical withstand voltage by performing excimer laser irradiation in a water vapor atmosphere. The reason for this has not been clarified yet, but it is possible that the ultraviolet laser is
When water hits, the water is excited and decomposes to form OH ions, which are combined with the excited aluminum to form Al (OH) 3 or A.
It is considered that a part of IOOH was generated and a part of AlOOH was transformed into crystals.
【０００９】尚、エキシマレ−ザ−のガス源としては、
ＡｒＦ（１９３ｎｍ）、ＫｒＦ（２４８ｎｍ）、ＸｅＣ
ｌ（３０８ｎｍ）、ＸｅＦ（３５１ｎｍ）などが良好で
あるが、短波長になるほど短時間で酸化ができる。水蒸
気雰囲気としては飽和状態が好ましいが必ずしも飽和で
なくてもレ−ザ−の波長、強度、時間などの調整により
良好な酸化皮膜が生成できる。As a gas source for the excimer laser,
ArF (193 nm), KrF (248 nm), XeC
1 (308 nm), XeF (351 nm) and the like are good, but the shorter the wavelength, the shorter the oxidation time. The water vapor atmosphere is preferably in a saturated state, but even if it is not always in a saturated state, a good oxide film can be formed by adjusting the wavelength, intensity, time, etc. of the laser.
【００１０】[0010]
【実施例】以下に本発明の具体的実施例について述べ
る。５０ｃｍ幅の９９．９９％高純度アルミニウム箔を
硼酸アンモニウム溶液にて５００Ｖの連続化成処理を行
った。その後２．５ｍｍスリットを行いスリットコイル
を作製した。処理１として上記スリットコイルを関係湿
度１００％雰囲気にてＫｒＦガス源としたエキシマレ−
ザ−を１０分間照射した。処理２として上記スリットコ
イルを関係湿度９５％雰囲気にてＡｒＦガス源としたエ
キシマレ−ザ−を１５分間照射した。処理３として上記
スリットコイルを関係湿度１００％雰囲気にてＡｒＦガ
ス源としたエキシマレ−ザ−を２０分間照射した。又比
較例として上記スリットコイルを無処理のものを用い
た。以上の処理を施したアルミニウムスリットをリ−ド
タブとして定格４００Ｖ２２０μＦの電解コンデンサを
作製し、初期特性および１０５℃５００時間の無負荷信
頼性試験を行い特性を確認した。それらの結果を表１に
示した。EXAMPLES Specific examples of the present invention will be described below. A 50 cm width 99.99% high-purity aluminum foil was subjected to continuous chemical conversion treatment at 500 V with an ammonium borate solution. After that, slitting was performed by 2.5 mm to produce a slit coil. As the process 1, the slit coil is used as an KrF gas source in a 100% relative humidity atmosphere.
The laser was irradiated for 10 minutes. As Process 2, the excimer laser using the slit coil as an ArF gas source was irradiated for 15 minutes in a 95% relative humidity atmosphere. As Process 3, the excimer laser using the slit coil as an ArF gas source was irradiated for 20 minutes in a 100% relative humidity atmosphere. As a comparative example, the slit coil was used without treatment. An electrolytic capacitor having a rating of 400 V and 220 μF was manufactured using the aluminum slits subjected to the above treatment as a lead tab, and initial characteristics and a no-load reliability test at 105 ° C. for 500 hours were performed to confirm the characteristics. The results are shown in Table 1.
【００１１】[0011]
【表１】 [Table 1]
【００１２】なお、上述の実施はリードタブについて述
べたが、スリットし巻回された陽極箔のスリット切り口
部に、同様にしてエキシマレーザーを照射してもよい。Although the lead tab has been described in the above-mentioned embodiment, the slit cut portion of the anode foil wound by slitting may be similarly irradiated with an excimer laser.
【００１３】[0013]
【発明の効果】表１に示すようにアルミニウムタブの切
り口部にエキシマレ−ザ−により酸化皮膜を生成させて
やれば信頼性、特に漏れ電流特性の大幅な改善が実現で
きた。また、切り口部の酸化方法もエキシマレ−ザ−を
用いるため極めて容易で、工程上の不都合もなく、工程
歩留まりも良好であり、その工業的かつ実用的価値大な
るものである。As shown in Table 1, if an oxide film is formed on the cut portion of the aluminum tab by an excimer laser, the reliability, particularly the leakage current characteristic, can be greatly improved. Also, the method of oxidizing the cut end is extremely easy because an excimer laser is used, there is no inconvenience in the process, and the process yield is good, which is of great industrial and practical value.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０１Ｇ 9/00 // Ｈ０１Ｓ 3/225 Ｈ０１Ｇ 9/24 Ｂ 7454−4Ｍ Ｈ０１Ｓ 3/223 Ｅ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication H01G 9/00 // H01S 3/225 H01G 9/24 B 7454-4M H01S 3/223 E
Claims (1)
回してコンデンサ素子を形成し、該素子をケ−スに収納
してなる電解コンデンサにおいて、該陽極箔より引き出
されたリ−ドタブの切り口部または該陽極箔の切り口部
に酸化皮膜を生成させる手段として、広幅アルミニウム
を予め連続化成工程にて陽極酸化を行った後、所定寸法
幅にてスリットし巻回されたリ−ドタブまたは陽極箔の
スリット切り口部に、水蒸気雰囲気中にてエキシマレ−
ザ−を照射することを特徴とする電解コンデンサの製造
方法。1. An electrolytic capacitor in which an anode foil and a cathode foil are wound with a separator between them to form a capacitor element, and the element is housed in a case. As a means for forming an oxide film on the cut portion of the dotab or the cut portion of the anode foil, a lead tab formed by previously anodizing wide aluminum in a continuous chemical conversion step and then slitting and winding it with a predetermined width. Or, in the slit cut part of the anode foil, excimer-ray in a steam atmosphere.
A method for manufacturing an electrolytic capacitor, which comprises irradiating the laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21344693A JP3396265B2 (en) | 1993-08-04 | 1993-08-04 | Electrolytic capacitor manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21344693A JP3396265B2 (en) | 1993-08-04 | 1993-08-04 | Electrolytic capacitor manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0750228A true JPH0750228A (en) | 1995-02-21 |
| JP3396265B2 JP3396265B2 (en) | 2003-04-14 |
Family
ID=16639366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21344693A Expired - Fee Related JP3396265B2 (en) | 1993-08-04 | 1993-08-04 | Electrolytic capacitor manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3396265B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1028441A1 (en) * | 1998-06-09 | 2000-08-16 | Showa Denko Kabushiki Kaisha | Solid electrolytic capacitor electrode foil, method of producing it and solid electrolytic capacitor |
| JP2008045190A (en) * | 2006-08-21 | 2008-02-28 | Showa Denko Kk | Method for forming oxide film on valve action metal material |
| CN107974701A (en) * | 2017-11-15 | 2018-05-01 | 广西贺州市桂东电子科技有限责任公司 | A kind of pre-treating method of anode aluminium foil chemical conversion |
-
1993
- 1993-08-04 JP JP21344693A patent/JP3396265B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1028441A1 (en) * | 1998-06-09 | 2000-08-16 | Showa Denko Kabushiki Kaisha | Solid electrolytic capacitor electrode foil, method of producing it and solid electrolytic capacitor |
| EP1028441A4 (en) * | 1998-06-09 | 2006-12-13 | Showa Denko Kk | Solid electrolytic capacitor electrode foil, method of producing it and solid electrolytic capacitor |
| JP2008045190A (en) * | 2006-08-21 | 2008-02-28 | Showa Denko Kk | Method for forming oxide film on valve action metal material |
| CN107974701A (en) * | 2017-11-15 | 2018-05-01 | 广西贺州市桂东电子科技有限责任公司 | A kind of pre-treating method of anode aluminium foil chemical conversion |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3396265B2 (en) | 2003-04-14 |
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