JP3394070B2 - Electrolytic capacitor - Google Patents
Electrolytic capacitorInfo
- Publication number
- JP3394070B2 JP3394070B2 JP18090393A JP18090393A JP3394070B2 JP 3394070 B2 JP3394070 B2 JP 3394070B2 JP 18090393 A JP18090393 A JP 18090393A JP 18090393 A JP18090393 A JP 18090393A JP 3394070 B2 JP3394070 B2 JP 3394070B2
- Authority
- JP
- Japan
- Prior art keywords
- female screw
- external electrode
- washer
- lead tab
- electrode terminal
- 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.)
- Expired - Fee Related
Links
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は電解コンデンサのリード
タブと封口端子板部分の改良、特にコンデンサ素子引出
しリードタブと外部電極端子との接合部の電気化学的安
定性を改良した電解コンデンサに関するものである。
【０００２】
【従来の技術】従来まで、電解コンデンサの封止部分は
封口端子板を外装金属ケースのカーリング等により機械
的締め付け固定させ、コンデンサ素子からの引出しリー
ドタブは該封口端子板に設けたアルミリベットに接続し
ていた。当該部分の電気化学的安定性はこの接続により
保持されていた。しかしながらこの接続だけでは駆動用
電解液がリードタブ、リベット、ワッシャに影響し電気
化学的安定性は不十分であった。
【０００３】この従来までのアルミリベットとリードタ
ブとの接合はワッシャを介しての加締方式もしくは溶接
方式などが多く、この方式を前提として駆動用電解液と
の電気化学的反応を防ぐ各種試みが検討されてきた。た
とえばリベット、ワッシャに陽極酸化処理により酸化皮
膜を施し、表面の電気化学的反応を防ごうとする試みな
どがある。
【０００４】しかしながら、リベット、ワッシャに酸化
皮膜を施すことによりかえって接合強度が低下したりし
て不都合を生じる。又、接合強度を増加させるにはどう
しても表面の皮膜除去が必要であった。しかしながら、
リベット、ワッシャの接合部に駆動用電解液が付着した
状態で通電されてできる化成皮膜はエージングのみなら
ず製品の信頼性にも大きな影響を与えている。具体的に
はコンデンサとして製品化した場合において、過電圧印
加などの電気的衝撃により当該部分においての絶縁破壊
が生じ易く防爆弁の作動無くショ−トに至るケ−ス等安
全上非常に問題がある。また実開昭５６−４０６４６号
公報のようにリベットの部分に絶縁性樹脂を塗布したも
のがあったが、腐食を生じたり樹脂の亀裂を生じたりす
る欠点があった。
【０００５】
【発明が解決しようとする課題】本発明はコンデンサ素
子からの引出しリードタブと該封口端子板に設けた外部
電極端子との接触を充分な機械的結合により行わせた上
で、更に該接続部の電気化学的安定性を確実なものにす
るものである。
【０００６】
【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、コンデンサ素子からの引出しリー
ドタブと封口端子板に設けた外部電極端子の該接続部の
電気化学的安定性が不十分であった点を改善するために
表面が水酸化アルミで覆われた雌ネジ、雄ネジ及びワッ
シャにより形成された封口端子板に設けた外部電極端子
とリードタブをネジ締めによる接合を行い、該接続部が
水和酸化アルミに覆われることにより接合部の電気化学
的安定性を確実にしたものである。即ち、アルミニウム
陽極箔と陰極箔をセパレータを介して巻回してコンデン
サ素子を形成し、該陽極箔と陰極箔から引出されたリー
ドタブを封口端子板に固着した外部電極端子と接合し、
ケースに収納してなる電解コンデンサにおいて、上記外
部電極端子のコンデンサ素子側に雌ネジ部または雄ネジ
部を形成し、上記リードタブおよびワッシャを介して上
記雌ネジ部に螺合する締付用雄ねじ、または上記雄ネジ
部に螺合する締付用雌ネジでネジ締めすると共に上記ワ
ッシャおよび締付用雄ネジまたは締付用雌ネジは、それ
ぞれ９９．９２％以上の高純度アルミニウムから構成さ
れ、かつ純水ボイル処理により表面が水和酸化アルミニ
ウムで覆われていることを特徴とする電解コンデンサで
ある。
【０００７】
【作用】本発明によれば該接続部は水和酸化皮膜に覆わ
れているので駆動用電解液と直に接触することがなく、
従って駆動用電解液と不都合な反応を起こすことがな
い。また本発明の工程での操作も難点がなく容易に工程
導入でき得る。なお、締付用雄ネジまたは締付用雌ネジ
及びワッシャは純水ボイル処理により水和酸化皮膜を生
成させているが、この水和酸化皮膜を分析するとベーマ
イト（ＡｌＯＯＨ）および水酸化アルミニウム（Ａｌ
（ＯＨ）3 ）がほとんどであった。また、電気化学的に
安定な皮膜を生成させるためには９９．９２％以上の高
純度アルミニウムでできた締付用雄ネジまたは締付用雌
ネジ及びワッシャにする必要があった。
【０００８】
【実施例】以下に本発明を図１〜図４に示す具体的実施
例について述べる。図１はリードタブと外部電極端子と
を内側よりネジ締めを行う要部の説明図、図４は電解コ
ンデンサの断面図である。１は樹脂などの絶縁性を有す
る封口端子板、２は封口端子板１にモールド成型等によ
り固着された外部電極端子である。３は外部電極端子２
のコンデンサ素子側に形成された雌ネジ部である。４は
純度９９．９２％以上の高純度アルミニウムをプレス加
工したワッシャであり純水ボイル処理を施してある。５
は穴５ａを形成したアルミニウム製リードタブ、６は上
記雌ネジ部３に螺合する雄ネジであり純度９９．９２％
以上の高純度アルミニウムからなり、純水ボイルを施し
てある。図２はリードタブ５と外部電極端子２との接合
後の様子を示した要部の説明図である。コンデンサ素子
９から導出したリードタブ５はワッシャ４を介して雌ネ
ジ部３と雄ネジ６によりしっかりと螺合し、接合され
る。これにより、実際駆動用電解液と接する雄ネジ６、
ワッシャ４は表面が水和酸化皮膜に覆われるため、駆動
用電解液との反応は防ぐことができる。１０は固定材、
１１はケースである。
【０００９】次に図１に示す本発明の実施例と従来例と
を定格４００Ｖ，８２０μＦのＣＥ６９形電解コンデン
サを作製しエージング特性及び信頼性試験を行った。エ
ージングの電気量を比較してみると約１５％程本発明の
方が少ない電気量で済んでいた。これは本発明の雄ネ
ジ、ワッシャ部の表面に生成した水和酸化皮膜が有効に
作用しており駆動用電解液との電気化学的反応が抑制さ
れていることを示していた。又、信頼性試験は１０５℃
にて１０００時間の無負荷放置による漏れ電流値の増大
率にて評価を行ったが、従来例が初期の４．２倍になっ
ているのに対し本発明例は１．９倍と１／２以下まで改
善されていた。これもリードタブと外部電極端子の接合
がネジ締めにより極めて安定でありリベット加締より長
時間の変化に対しては良好であることを示している。加
えて表面の水和酸化皮膜が恒温長時間においても駆動用
電解液との電気化学的反応を有効に抑制していることを
示しているものである。
【００１０】図３は本発明の他の実施例を示し、上述の
実施例において外部電極端子２には雌ネジ部３の代わり
に雄ネジ部７を用い締付用雌ネジ８で螺合し構成したも
ので、締付用雌ネジ８は純度９９．９２％以上のアルミ
ニウムからなり、純水ボイル処理を施したものを用いた
もので、上述と同様な効果が得られる。
【００１１】
【発明の効果】上述の実施例で述べたように本発明によ
れば、エージングによる消費電力は大幅に削減でき省エ
ネルギー化が実現でき、又、信頼性においても従来品と
比べ漏れ電流特性が大幅に改善できた。又、併せて工程
におけるトラブルが大幅に削減し工程歩留の向上と生産
性向上が実現でき、本発明の工業的、実用的価値は大な
るものがある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a lead tab and a sealing terminal plate portion of an electrolytic capacitor, and more particularly, to an electrochemical stability of a junction between a lead tab of a capacitor element and an external electrode terminal. The present invention relates to an electrolytic capacitor having improved characteristics. Heretofore, the sealing portion of an electrolytic capacitor has a sealing terminal plate mechanically fixed by curling or the like of an external metal case, and a lead tab drawn out from the capacitor element has an aluminum terminal provided on the sealing terminal plate. Was connected to rivets. The electrochemical stability of the part was maintained by this connection. However, with this connection alone, the driving electrolyte affected the lead tab, rivet, and washer, and the electrochemical stability was insufficient. [0003] Conventionally, the joining of an aluminum rivet and a lead tab is performed by a caulking method or a welding method using a washer in many cases. On the premise of this method, various attempts have been made to prevent an electrochemical reaction with a driving electrolyte. Has been considered. For example, there is an attempt to prevent the electrochemical reaction on the surface by applying an oxide film to the rivet or washer by anodizing. However, applying an oxide film to a rivet or washer rather causes a problem such as a decrease in bonding strength. Further, in order to increase the bonding strength, it was absolutely necessary to remove the surface film. However,
A chemical conversion film formed by energization with the driving electrolyte adhered to the joint between the rivet and washer has a great effect not only on aging but also on product reliability. Specifically, when a capacitor is commercialized, dielectric breakdown is likely to occur in the relevant portion due to an electric shock such as application of an overvoltage, and there is a very serious problem in safety such as a case where the explosion-proof valve does not operate and a short circuit occurs. . In addition, as disclosed in Japanese Utility Model Laid-Open Publication No. Sho 56-40646, the rivet portion is coated with an insulating resin, but has the drawback of causing corrosion and cracking of the resin. According to the present invention, the lead tab drawn out from the capacitor element and the external electrode terminal provided on the sealing terminal plate are brought into contact with each other by a sufficient mechanical connection. This ensures the electrochemical stability of the connection. [0006] The present invention has been found as a result of various studies to solve the above problems. The gist of the present invention is that the surface is made of aluminum hydroxide in order to improve the electrochemical stability of the connection portion between the lead tab drawn out from the capacitor element and the external electrode terminal provided on the sealing terminal plate was insufficient. The external electrode terminal provided on the sealing terminal plate formed by the covered female screw, male screw and washer and the lead tab are joined by screw tightening, and the connection portion is covered with hydrated aluminum oxide so that the electrical connection of the joint portion is made. It ensures chemical stability. That is, the aluminum anode foil and the cathode foil are wound via a separator to form a capacitor element, and a lead tab drawn out from the anode foil and the cathode foil is bonded to an external electrode terminal fixed to a sealing terminal plate,
In the electrolytic capacitor housed in the case, a female screw portion or a male screw portion is formed on the capacitor element side of the external electrode terminal, and a male screw for fastening is screwed to the female screw portion via the lead tab and the washer, Alternatively, the washer and the tightening male screw or the tightening female screw are each made of high-purity aluminum of 99.92% or more, and the washer and the tightening male screw or the tightening female screw are screwed together. An electrolytic capacitor characterized in that the surface is covered with hydrated aluminum oxide by pure water boiling. According to the present invention, since the connecting portion is covered with the hydrated oxide film, it does not come into direct contact with the driving electrolyte.
Therefore, no adverse reaction occurs with the driving electrolyte. Further, the operation in the process of the present invention can be easily introduced without any difficulty. Note that the male screw for tightening or the female screw for tightening and the washer generate a hydrated oxide film by boiling with pure water.
(OH) 3 ) was mostly present. In addition, in order to form an electrochemically stable film, it was necessary to use a male screw for tightening or a female screw for tightening and a washer made of high-purity aluminum of 99.92% or more. The present invention will be described below with reference to specific embodiments shown in FIGS. FIG. 1 is an explanatory view of a main portion for screwing a lead tab and an external electrode terminal from the inside, and FIG. 4 is a sectional view of an electrolytic capacitor. Reference numeral 1 denotes a sealing terminal plate having an insulating property such as resin, and 2 denotes an external electrode terminal fixed to the sealing terminal plate 1 by molding or the like. 3 is an external electrode terminal 2
Female screw portion formed on the side of the capacitor element. Reference numeral 4 denotes a washer obtained by pressing high-purity aluminum having a purity of 99.92% or more, which has been subjected to pure water boil processing. 5
Is an aluminum lead tab having a hole 5a formed therein, and 6 is a male screw which is screwed into the female screw portion 3 and has a purity of 99.92%.
It is made of the above high-purity aluminum, and is subjected to pure water boiling. FIG. 2 is an explanatory view of a main part showing a state after the lead tab 5 and the external electrode terminal 2 are joined. The lead tab 5 led out from the capacitor element 9 is screwed firmly with the female screw portion 3 and the male screw 6 via the washer 4 and joined. As a result, the male screw 6, which is in contact with the actual driving electrolyte,
Since the surface of the washer 4 is covered with the hydrated oxide film, a reaction with the driving electrolyte can be prevented. 10 is a fixing material,
11 is a case. Next, a CE69 type electrolytic capacitor having a rating of 400 V and 820 μF was manufactured using the embodiment of the present invention shown in FIG. 1 and the conventional example, and aging characteristics and reliability tests were performed. Comparing the amount of electricity of aging, it was found that about 15% of the present invention required less electricity. This indicated that the hydrated oxide film formed on the surface of the male screw and washer of the present invention was effectively acting, and the electrochemical reaction with the driving electrolyte was suppressed. The reliability test is 105 ° C
The evaluation was performed based on the increase rate of the leakage current value caused by leaving the load unloaded for 1000 hours. It was improved to 2 or less. This also indicates that the connection between the lead tab and the external electrode terminal is extremely stable by screw tightening, and is better for a long-term change than riveting. In addition, it indicates that the hydrated oxide film on the surface effectively suppresses the electrochemical reaction with the driving electrolyte even at a constant temperature for a long time. FIG. 3 shows another embodiment of the present invention. In the above-described embodiment, the external electrode terminal 2 is screwed with a female screw 8 using a male screw 7 instead of the female screw 3. The tightening female screw 8 is made of aluminum having a purity of 99.92% or more and is subjected to pure water boil processing, and the same effects as described above can be obtained. As described in the above embodiment, according to the present invention, the power consumption due to aging can be greatly reduced, energy saving can be realized, and the leakage current is lower in reliability than the conventional product. The characteristics were greatly improved. In addition, troubles in the process can be greatly reduced, thereby improving the process yield and improving the productivity, and the industrial and practical value of the present invention is large.
【図面の簡単な説明】
【図１】本発明に係るリードタブと外部電極端子とのネ
ジ締要部の一実施例の説明図である。
【図２】本発明に係るリードタブと外部電極端子とのネ
ジ締要部の側面図である。
【図３】本発明に係るリードタブと外部電極端子とのネ
ジ締要部の他の実施例の説明図である。
【図４】本発明の電解コンデンサの一実施例の断面図で
ある。
【符号の説明】
１ 封口端子板
２ 外部電極端子
３ 外部電極端子に形成した雌ネジ部
４ ワッシャ
５ リードタブ
６ 締付用雄ネジ
７ 外部電極端子に形成した雄ネジ部
８ 締付用雌ネジBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an embodiment of a main part of a screw between a lead tab and an external electrode terminal according to the present invention. FIG. 2 is a side view of a screw tightening portion of the lead tab and the external electrode terminal according to the present invention. FIG. 3 is an explanatory view of another embodiment of a main part of a screw between a lead tab and an external electrode terminal according to the present invention. FIG. 4 is a sectional view of an embodiment of the electrolytic capacitor of the present invention. [Description of Signs] 1 Sealing terminal plate 2 External electrode terminal 3 Female screw portion 4 formed on external electrode terminal 4 Washer 5 Lead tab 6 Male screw for tightening 7 Male screw portion formed on external electrode terminal 8 Female screw for tightening
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01G 9/008 Continuation of front page (58) Field surveyed (Int.Cl. 7 , DB name) H01G 9/008
Claims (1)
タを介して巻回してコンデンサ素子を形成し、該陽極箔
と陰極箔から引出されたリードタブを封口端子板に固着
した外部電極端子と接合し、ケースに収納してなる電解
コンデンサにおいて、上記外部電極端子のコンデンサ素
子側に雌ネジ部または雄ネジ部を形成し、上記リードタ
ブおよびワッシャを介して上記雌ネジ部に螺合する締付
用雄ねじ、または上記雄ネジ部に螺合する締付用雌ネジ
でネジ締めすると共に上記ワッシャおよび締付用雄ネジ
または締付用雌ネジは、それぞれ９９．９２％以上の高
純度アルミニウムから構成され、かつ純水ボイル処理に
より表面が水和酸化アルミニウムで覆われていることを
特徴とする電解コンデンサ。(57) [Claim 1] An aluminum anode foil and a cathode foil are wound via a separator to form a capacitor element, and a lead tab drawn out from the anode foil and the cathode foil is used as a sealing terminal plate. In an electrolytic capacitor which is joined to a fixed external electrode terminal and housed in a case, a female screw portion or a male screw portion is formed on the capacitor element side of the external electrode terminal, and the female screw portion is formed via the lead tab and a washer. And the female screw for screwing to the male screw portion, and the washer and the male screw for tightening or the female screw for tightening are 99.92% or more, respectively. An electrolytic capacitor made of high-purity aluminum and having a surface covered with hydrated aluminum oxide by boiling with pure water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18090393A JP3394070B2 (en) | 1993-06-24 | 1993-06-24 | Electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18090393A JP3394070B2 (en) | 1993-06-24 | 1993-06-24 | Electrolytic capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0786091A JPH0786091A (en) | 1995-03-31 |
| JP3394070B2 true JP3394070B2 (en) | 2003-04-07 |
Family
ID=16091327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18090393A Expired - Fee Related JP3394070B2 (en) | 1993-06-24 | 1993-06-24 | Electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3394070B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09251927A (en) * | 1996-03-14 | 1997-09-22 | Kansai Coke & Chem Co Ltd | Method of connecting leads of collecting electrodes to external terminals of electric double layer capacitor |
| JP2006340548A (en) * | 2005-06-03 | 2006-12-14 | Nippon Steel Corp | Riveted laminated core and method and apparatus for manufacture thereof |
| JP2015117423A (en) * | 2013-12-19 | 2015-06-25 | 住友電気工業株式会社 | Aluminum alloy wire material, capacitor and manufacturing method of aluminum alloy wire material |
| JP6460587B2 (en) * | 2018-01-24 | 2019-01-30 | 住友電気工業株式会社 | Aluminum alloy wire, capacitor, and method of manufacturing aluminum alloy wire |
| EP3933863B1 (en) * | 2019-03-01 | 2023-12-13 | Inner Mongolia Ulanqab Dongyangguang Formed Foil Co., Ltd. | Electrode structure body and fabrication method thereof |
-
1993
- 1993-06-24 JP JP18090393A patent/JP3394070B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0786091A (en) | 1995-03-31 |
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