JP3949791B2

JP3949791B2 - Electrolytic capacitor with safety device

Info

Publication number: JP3949791B2
Application number: JP27011097A
Authority: JP
Inventors: 雄司矢口; 喜一西澤; 毅一別所
Original assignee: Nichicon Capacitor Ltd
Current assignee: Nichicon Capacitor Ltd
Priority date: 1997-10-02
Filing date: 1997-10-02
Publication date: 2007-07-25
Anticipated expiration: 2017-10-02
Also published as: JPH11111579A

Description

【０００１】
【発明の属する技術分野】
本発明は、電子部品のコンデンサに関するものであり、特にオープン状態の保安機構を備えた電解コンデンサを提供することを目的とするものである。
【０００２】
【従来の技術】
電解コンデンサは、陽極箔と陰極箔とをセパレータ紙を介して巻回または積層してなるコンデンサ素子に電解液を含浸し、さらにコンデンサ素子をコンデンサケースに収容し、その開放端側をコンデンサケースの内部を密封状態とするための封口板が、コンデンサケースのカール部によって固定されている。ネジ端子形コンデンサの封口板は、フェノール樹脂などの樹脂板にネジ加工したアルミニウム端子がインサート成形されている。基板端子形コンデンサの封口板は、外側のラバー層と内側のフェノール樹脂板からなる二層構造になっており、封口板の外側に外部端子がリベットにより固定されている。いずれの電解コンデンサにおいても、封口板の内側ではリベットとコンデンサ素子から引き出されたリード板が接続されている。電解コンデンサにおいては、漏れ電流などによる水素ガスの発生や発熱による気体の膨張によりコンデンサケース内の圧力が上昇するという問題がある。この内部圧力の上昇は、封口板の飛び出しやコンデンサケースの破裂の原因となる。そこで従来はコンデンサケースの底面側に肉薄部を形成したり、封口板のフェノール樹脂板に穴を形成し、コンデンサケースの内部圧力が異常に高くなる前に、内部のガスを放出するための保安機構としての防爆弁構造を採用していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、内部のガスを放出する防爆弁構造では、この弁の作動とともにコンデンサ素子に含浸されていた電解液がミスト状に吹き出してしまう。電解液は導電性であり、可燃性のものも使用されるため、放出された電解液が基板回路や接続ブスバーをショートさせて回路の誤動作、また場合によっては発火源となる危険性があった。
【０００４】
上記理由により、電解コンデンサが寿命に達したとき、あるいは異常が発生したときは、電解コンデンサ自身でオープン状態になるものが望まれていた。この要請に応えるため、実開平４−１１３４３４号、実開平５−５５５３８号、実開平６−１１３４１号公報が開示されている。しかしながら、実開平５−５５５３８号公報に開示されている図７では、外部端子がブスバー等に固定される実装方法では、電解コンデンサの寿命または異常が発生した場合、電解コンデンサの内圧が上昇しても封口板と外部端子がリベットにより固着されているため、図８のように封口板が外側へ変形できないのでリード板が切断されず、オープン状態にならないという問題があった。
【０００５】
【課題を解決するための手段】
本発明は、上記課題を解決するため、外部端子をコンデンサケースのカール部で固定した絶縁キャップ上に設け、外部端子と封口板に空間を設けることにより、電解コンデンサの外部端子がブスバー等に固定されていても、電解コンデンサの寿命終了時または異常時に、電解コンデンサ自身がオープン状態となる保安機構を有する保安装置付電解コンデンサである。
【０００６】
すなわち、コンデンサ素子１が収容されたコンデンサケース２と、コンデンサ素子１と中継端子３とを電気的に接続する第１のリード板５と、中継端子３とリベット４とを電気的に接続する第２のリード板６と、リベット４と外部端子１０とを電気的に接続する第３のリード板９と、前記コンデンサケース２の開放端側に固定されて、その内部を密封する封口板８と、前記第２のリード板６と第３のリード板９とを絶縁板１６を介して固定する前記リベット４が金属リベット４ａと中空リベット４ｂとからなり、
第２のリード板６の張設状態を前記コンデンサケース２内の内圧上昇による前記封口板８の外側に向けての変形により、第２のリード板６を切断可能な状態に規定する張設状態規定板７を前記封口板８の裏面に配した保護装置付電解コンデンサにおいて、
上記中空リベット４ｂに第２のリード板６の一端が接続され、張設状態規定板７が、中空リベット４）間の間隔より幅が狭い貫通孔７ｂを有しており、前記第２のリード板が前記貫通孔に挿通されて、さらに一端が中継端子３に接続され、
第２のリード板６が切断位置を規定する脆弱箇所となる貫通孔６ａを有し、上記張設状態規定板７が貫通孔７ｂに向かって突起部７ａを有しており、
さらに、上記第２のリード板６の貫通孔６ａに張設状態規定板７の突起部７ａが通されており、
また外部端子を固定する絶縁キャップ１１が、コンデンサケースの横カール部にはめ込み固定されていることを特徴とする保安装置付電解コンデンサである。
【０００７】
また、コンデンサ素子１が収容されたコンデンサケース２と、コンデンサ素子１と中継端子３とを電気的に接続する第１のリード板５と、中継端子３とリベット４とを電気的に接続する第２のリード板６と、リベット４と外部端子１０とを電気的に接続する第３のリード板９と、前記コンデンサケース２の開放端側に固定されて、その内部を密封する封口板８と、前記第２のリード板６と第３のリード板９とを絶縁板１６を介して固定する前記リベット４が金属リベット４ａと中空リベット４ｂとからなり、
第２のリード板６の張設状態を前記コンデンサケース２内の内圧上昇による前記封口板８の外側に向けての変形により、第２のリード板６を切断可能な状態に規定する張設状態規定板７を前記封口板８の裏面に配した保護装置付電解コンデンサにおいて、
前記中空リベット４ｂに第２のリード板６の一端が接続され、張設状態規定板７が、中空リベット４間の間隔より幅が狭い貫通孔７を有しており、前記第２のリード板が前記貫通孔に挿通されて、さらに一端が中継端子３に接続され、
第２のリード板６に切断位置を規定する脆弱箇所が形成され、また外部端子を固定する絶縁キャップ１１が、コンデンサケースの横カール部にはめ込み固定されており、
上記記載の張設状態規定板７が貫通孔７ｂを有し、弾性を有する断面がＵ字形の拡張子１８が、第２のリード板６により先端が狭められた状態で、張設状態規定板７の貫通孔７ｂに挿入されていることを特徴とする保安装置付電解コンデンサである。
【０００８】
そして、上記記載の絶縁キャップ１１は、コンデンサ側の開口部の内壁に複数の突起１１ａを有することを特徴とする請求項１または請求項２に記載の保安装置付電解コンデンサである。
【００１０】
さらに、上記記載の張設状態規定板７は、その外周輪郭が上記封口板８の外周輪郭と同じであり、また、これら張設状態規定板７と封口板８は、重ね合わされた状態で上記コンデンサケース２の開放端側のカール部によって固定されていることを特徴とする請求項１または請求項２に記載の保安装置付電解コンデンサである。
【００１１】
また、上記記載の封口板８の絶縁キャップ側に絶縁板１６を設け、上記記載の絶縁キャップ１１は、外部端子の裏面側にツメ部またはカド部を先端部に有する突起を設け、かつ該突起に対応する上記記載の絶縁板１６の位置にもツメ部またはカド部を先端部に有する突起を設け、保安装置作動時にツメ部とカド部またはツメ部同士が嵌合するよう構成したことを特徴とする請求項１または請求項２に記載の保安装置付電解コンデンサである。
【００１２】
そして、上記記載の絶縁キャップ１１は、外周に固定用取付足１９が設けられたことを特徴とする請求項１または請求項２に記載の保安装置付電解コンデンサである。
【００１３】
【発明の実施の形態】
本発明は、中継端子とリベットとを切断位置となる脆弱箇所が形成されている第２のリード板で接続し、コンデンサケースのカール部に固定された絶縁キャップに外部端子を固定する。これらの構成により、電解コンデンサの外部端子が固定されていても、外部端子と封口板が直接固定されていないので封口板が変形でき、電解コンデンサの寿命終了時または異常時に封口板が外側に変形し、第２のリード板を脆弱箇所で切断して、オープン状態にすることができる。
【００１４】
【実施例】
以下本発明の実施例について、図面を参照して説明する。
（参考例１）図１は、保安装置付電解コンデンサを、配線ブスバーに接続固定した状態の断面図である。
陽極箔と陰極箔とをセパレータ紙を介して巻回または積層してなるコンデンサ素子１に、電解液を含浸しコンデンサケース２に収容した。その際、コンデンサ素子をコンデンサケース２内で固定するために、公知の固定剤１５を使用してもよい。コンデンサケース２の開放端側は、封口板８と張設状態規定板７とが重ね合わされた状態で、カーリング加工により封止されている。上記封口板８には成形したアルミニウム板を使用した。
【００１５】
外部端子１０は、第３のリード板９を介してリベット４にて電気的に接続される。また外部端子１０は絶縁キャップ１１に固定されている。さらに絶縁キャップ１１は、該絶縁キャップ１１に設けられた突起部１１ａにて、コンデンサケース２に形成されたカール部にはめ込み固定されている。
【００１６】
また上記張設状態規定板７は、封口板８と外形寸法が同等の円盤状のものであり、その中央部に貫通孔７ｂが形成されている。この張設状態規定板７には、封口板８に固着されたリベット４に対応する位置に中継端子３が固着されている。また、中継端子３と張設状態規定板７の貫通孔７ｂ間に第２のリード板案内用スリットを形成してもよい。
【００１７】
コンデンサ素子１より引き出された第１のリード板５は、中継端子３の下端側にワッシャー加締めなどの方法により固着されている。さらに、中継端子３の下端側から封口板８に固着されたリベット４の下端側に第２のリード板６が電気的に接続されている。第２のリード板６の途中には脆弱箇所が形成されている。また、リベット４の上端から外部端子１０の下端側に第３のリード板が電気的に接続されている。
【００１８】
上記構成による電解コンデンサは、漏れ電流、逆印加電流、過電圧印加等による水素ガスの発生による内部圧力の上昇により、封口板８が外側へ変形する。ここで、絶縁キャップ１１上に外部端子１０が設けられ、外部端子１０と封口板とが直接固定されていないので、外部端子１０が固定されていても封口板８は自由に変形できる。内部圧力がさらに上昇すると封口板８の変形がさらに大きくなり、中継端子３とリベット４とを接続する第２のリード板６への張力が高まり、第２のリード板が脆弱箇所で切断し、電解コンデンサはオープン状態になる。
【００１９】
（実施例２）図３は本発明による保安装置付電解コンデンサを、配線ブスバーに接続固定した状態の断面図である。
貫通孔を有する第２のリード板６の貫通孔６ａに対応する位置に、張設状態規定板７の貫通孔７ｂ壁面に突起部７ａを設け、該突起部を第２のリード板６の貫通孔６ａに通し、第２のリード板６にて中継端子３の下端とリベット４の下端とを電気的に接続している。その他の構造は参考例１と同様である。
【００２０】
上記構成による本発明の電解コンデンサは、漏れ電流、逆印加電流、過電圧印加等による水素ガスの発生による内部圧力の上昇により、封口板８が外側へ変形する。ここで、絶縁キャップ１１上に外部端子１０が設けられ、外部端子１０と封口板とが直接固定されていないので、外部端子１０が固定されていても封口板８は自由に変形できる。内部圧力がさらに上昇すると封口板８の変形がさらに大きくなり、中継端子３とリベット４とを接続する第２のリード板６への張力が高まり、第２のリード板が脆弱箇所で切断し、電解コンデンサはオープン状態になる。そして、第２のリード板６が張設状態規定板７の突起部にて確実に分離され、切断された第２のリード板が接触することを防ぐことができる。
【００２１】
（実施例３）図４は本発明による保安装置付電解コンデンサを、配線ブスバーに接続固定した状態の断面図である。
張設状態規定板７の貫通孔７ｂに第２のリード板６を挿入した後、その内側に弾性を有する断面がＵ字形の拡張子１８を挿入した。このとき第２のリード板６の張力により、拡張子１８の先端は内側へ押されている。その他の構造は参考例１と同様である。
【００２２】
上記構成による本発明の電解コンデンサは、漏れ電流、逆印加電流、過電圧印加等による水素ガスの発生による内部圧力の上昇により、封口板８が外側へ変形する。ここで、絶縁キャップ１１上に外部端子１０が設けられ、外部端子１０と封口板とが直接固定されていないので、外部端子１０が固定されていても封口板８は自由に変形できる。内部圧力がさらに上昇すると封口板８の変形がさらに大きくなり、中継端子３とリベット４とを接続する第２のリード板６への張力が高まり、第２のリード板が脆弱箇所で切断し、電解コンデンサはオープン状態になる。そして、第２のリード板６の切断によりその張力がなくなるので、第２のリード板６により押されていた拡張子１８の先端がその弾性力により開き、切断された第２のリード板が接触することを防ぐことができる。
【００２３】
（実施例４）図５は本発明による保安装置付電解コンデンサを、配線ブスバーに接続固定した状態の断面図である。
絶縁キャップ１１は、外部端子の裏面側に先端部にカド部１１ｂを有する突起を設け、かつ該突起に対応する絶縁板１６の位置に先端部にカド部１１ｂを有する突起を設けた。その他の構造は参考例１と同様である。なお、絶縁板１６の突起部の先端部にカド部を設け、絶縁キャップ１１の突起部の先端部にツメ部を設けてもよく、両方の突起の先端部にツメ部を設けてもよい。
【００２４】
上記構成による本発明の電解コンデンサは、漏れ電流、逆印加電流、過電圧印加等による水素ガスの発生による内部圧力の上昇により、封口板８が外側へ変形する。ここで、絶縁キャップ１１上に外部端子１０が設けられ、外部端子１０と封口板とが直接固定されていないので、外部端子１０が固定されていても封口板８は自由に変形できる。内部圧力がさらに上昇すると封口板８の変形がさらに大きくなり、絶縁板１６の突起部は先端が狭めながら、対応する絶縁キャップ１１の突起部に挿入され、絶縁板１６のツメ部１６ａが絶縁キャップ１１のカド部１６ａを越えると狭められた先端が開く。そして、中継端子３とリベット４とを接続する第２のリード板６への張力が高まり、第２のリード板が脆弱箇所で切断し、電解コンデンサはオープン状態になる。オープン状態になった後電解コンデンサの内圧が低下しても、絶縁板１６のツメ部１６ａと絶縁キャップ１１のカド部１１ｂがはめ合い構造になるため、初期の位置に戻ることがなく、切断された第２のリード板が接触することを防ぐことができる。
【００２５】
また、図６のように絶縁キャップ１１は、その外周部に取付足１９を設けることにより、コンデンサ本体を固定することができる。これにより、従来のように別部品として取付バンドを使用することなく、コンデンサ本体を固定することができる。
【００２６】
なお、上記実施例の構成に限らず、使用すべき各部材の材質、形状、リード部材の数、各部における固着方法などは、電解コンデンサの定格、用途などに応じて最適なものに設計されるべきものである。封口板についても、成形したアルミニウム板を使用したが、他の金属製板、ラバー貼フェノール樹脂板、ポリプロピレン樹脂、ポリアセタール樹脂、フェノール樹脂の成型品など、内圧上昇によって外側に向けて反る状態に変形可能なように材質または厚さを設計すればよい。
【００２７】
【発明の効果】
以上の通り、本発明による電解コンデンサは、コンデンサ素子と外部端子の間に、第１のリード板、張設状態規定板に固着された中継端子、脆弱箇所を設けた第２のリード板、封口板に固着されたリベット、第３のリード板、コンデンサケースのカール部で固定された絶縁キャップ、絶縁キャップに固定された外部端子と構成することにより、外部端子が固定されていても、電解コンデンサの寿命終了時または異常時に、電解コンデンサ自身で確実にオープン状態になることができ、工業的価値の大なるものである。
【図面の簡単な説明】
【図１】保安装置付電解コンデンサの断面図
【図２】図１に示す保安装置付電解コンデンサがオープン状態となった状態の断面図
【図３】本発明の実施例による保安装置付電解コンデンサの断面図
【図４】本発明の他の実施例による保安装置付電解コンデンサの断面図
【図５】本発明の他の実施例による保安装置付電解コンデンサの断面図
【図６】取付足を設けた本発明の絶縁キャップ
【図７】従来例に開示されている保安装置付電解コンデンサの断面図
【図８】図７に示す従来の保安装置付電解コンデンサがオープン状態となった状態の断面図
【符号の説明】
１コンデンサ素子
２コンデンサケース
３中継端子
４リベット
４ａ金属リベット
４ｂ中空リベット
５第１のリード板
６第２のリード板
６ａ貫通孔
７張設状態規定板
７ａ突起部
７ｂ貫通孔
８封口板
９第３のリード板
１０外部端子
１１絶縁キャップ
１１ａ突起部
１１ｂカド部
１２ボルト
１３弾性パッキン
１４弾性部材
１５固定剤
１６絶縁板
１６ａツメ部
１７配線ブスバー
１８拡張子
１９取付足[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a capacitor of an electronic component, and in particular, an object of the present invention is to provide an electrolytic capacitor having an open state safety mechanism.
[0002]
[Prior art]
An electrolytic capacitor is obtained by impregnating a capacitor element formed by winding or laminating an anode foil and a cathode foil with separator paper interposed therebetween, and further accommodating the capacitor element in a capacitor case, with the open end side of the capacitor case being A sealing plate for sealing the inside is fixed by a curled portion of the capacitor case. The sealing plate of the screw terminal type capacitor is insert-molded with an aluminum terminal screwed into a resin plate such as phenol resin. The sealing plate of the substrate terminal type capacitor has a two-layer structure consisting of an outer rubber layer and an inner phenolic resin plate, and external terminals are fixed to the outer side of the sealing plate by rivets. In any electrolytic capacitor, a rivet and a lead plate drawn from the capacitor element are connected inside the sealing plate. The electrolytic capacitor has a problem that the pressure in the capacitor case increases due to the generation of hydrogen gas due to leakage current or the like and the expansion of gas due to heat generation. This increase in internal pressure causes the sealing plate to pop out and the capacitor case to rupture. Therefore, conventionally, a thin part was formed on the bottom side of the capacitor case, or a hole was formed in the phenolic resin plate of the sealing plate, so that the internal gas was released before the internal pressure of the capacitor case became abnormally high. An explosion-proof valve structure was used as the mechanism.
[0003]
[Problems to be solved by the invention]
However, in the explosion-proof valve structure that releases the internal gas, the electrolytic solution impregnated in the capacitor element is blown out in the form of a mist with the operation of this valve. Since the electrolyte is conductive and flammable, the discharged electrolyte may short circuit the circuit board and connection bus bar, causing malfunction of the circuit, and in some cases, causing a risk of ignition. .
[0004]
For the above reasons, it has been desired that the electrolytic capacitor itself be in an open state when it reaches the end of its life or when an abnormality occurs. In order to meet this demand, Japanese Utility Model Laid-Open Nos. 4-113434, 5-55538, and 6-11341 are disclosed. However, in FIG. 7 disclosed in Japanese Utility Model Publication No. 5-55538, in the mounting method in which the external terminal is fixed to a bus bar or the like, the internal pressure of the electrolytic capacitor increases when the life or abnormality of the electrolytic capacitor occurs. However, since the sealing plate and the external terminal are fixed by rivets, the sealing plate cannot be deformed outward as shown in FIG. 8, so that there is a problem that the lead plate is not cut and is not opened.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an external terminal on an insulating cap fixed by a curled portion of a capacitor case, and by providing a space in the external terminal and the sealing plate, the external terminal of the electrolytic capacitor is fixed to a bus bar or the like Even if it is made, it is an electrolytic capacitor with a safety device having a safety mechanism in which the electrolytic capacitor itself is opened when the life of the electrolytic capacitor ends or is abnormal.
[0006]
That is, the capacitor case 2 in which the capacitor element 1 is accommodated, the first lead plate 5 that electrically connects the capacitor element 1 and the relay terminal 3, and the first that electrically connects the relay terminal 3 and the rivet 4. 2 lead plate 6, a third lead plate 9 that electrically connects the rivet 4 and the external terminal 10, and a sealing plate 8 that is fixed to the open end side of the capacitor case 2 and seals the inside thereof. The rivet 4 for fixing the second lead plate 6 and the third lead plate 9 via an insulating plate 16 comprises a metal rivet 4a and a hollow rivet 4b.
A stretched state in which the stretched state of the second lead plate 6 is defined so that the second lead plate 6 can be cut by deformation toward the outside of the sealing plate 8 due to an increase in internal pressure in the capacitor case 2. In the electrolytic capacitor with a protective device in which the regulation plate 7 is arranged on the back surface of the sealing plate 8,
One end of the second lead plate 6 is connected to the hollow rivet 4b, and the tension state defining plate 7 has a through hole 7b whose width is narrower than the interval between the hollow rivets 4), and the second lead A plate is inserted through the through hole, and one end is connected to the relay terminal 3,
The second lead plate 6 has a through hole 6a that becomes a weak spot that defines the cutting position, and the tension state defining plate 7 has a protrusion 7a toward the through hole 7b,
Furthermore, the protruding portion 7a of the tension state defining plate 7 is passed through the through hole 6a of the second lead plate 6;
In addition, in the electrolytic capacitor with a safety device, the insulating cap 11 for fixing the external terminal is fitted and fixed to the lateral curl portion of the capacitor case.
[0007]
The capacitor case 2 in which the capacitor element 1 is accommodated, the first lead plate 5 that electrically connects the capacitor element 1 and the relay terminal 3, and the first that electrically connects the relay terminal 3 and the rivet 4. 2 lead plate 6, a third lead plate 9 that electrically connects the rivet 4 and the external terminal 10, and a sealing plate 8 that is fixed to the open end side of the capacitor case 2 and seals the inside thereof. The rivet 4 for fixing the second lead plate 6 and the third lead plate 9 via an insulating plate 16 comprises a metal rivet 4a and a hollow rivet 4b.
A stretched state in which the stretched state of the second lead plate 6 is defined so that the second lead plate 6 can be cut by deformation toward the outside of the sealing plate 8 due to an increase in internal pressure in the capacitor case 2. In the electrolytic capacitor with a protective device in which the regulation plate 7 is arranged on the back surface of the sealing plate 8,
One end of the second lead plate 6 is connected to the hollow rivet 4b, and the tension state defining plate 7 has a through hole 7 narrower than the interval between the hollow rivets 4, and the second lead plate Is inserted through the through-hole, and one end is connected to the relay terminal 3,
The second lead plate 6 is formed with a fragile portion that defines the cutting position, and an insulating cap 11 for fixing the external terminal is fitted and fixed to the lateral curl portion of the capacitor case.
The tension state defining plate 7 having the through hole 7b and the elastic extension 18 having a U-shaped cross section is narrowed by the second lead plate 6. 7 is an electrolytic capacitor with a safety device, wherein the electrolytic capacitor is inserted into the through hole 7b.
[0008]
The insulating cap 11 described above is an electrolytic capacitor with a safety device according to claim 1 or 2, wherein the inner wall of the opening on the capacitor side has a plurality of protrusions 11a.
[0010]
Further, the tension state defining plate 7 described above has the same outer contour as the outer contour of the sealing plate 8, and the tension state defining plate 7 and the sealing plate 8 are overlapped with each other. The electrolytic capacitor with a safety device according to claim 1 or 2, wherein the electrolytic capacitor is secured by a curl portion on an open end side of the capacitor case (2).
[0011]
Further , the insulating plate 16 is provided on the insulating cap side of the sealing plate 8 described above, and the insulating cap 11 described above is provided with a protrusion having a claw portion or a caddy portion at the tip portion on the back surface side of the external terminal, and the protrusion A protrusion having a claw portion or a caddy portion at the tip is also provided at the position of the insulating plate 16 corresponding to the above, and the claw portion and the caddy portion or the claw portion are configured to be fitted to each other when the security device is operated. The electrolytic capacitor with a safety device according to claim 1 or 2.
[0012]
The insulating cap 11 described above is an electrolytic capacitor with a safety device according to claim 1 or 2, wherein a fixing mounting foot 19 is provided on an outer periphery.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, the relay terminal and the rivet are connected by the second lead plate in which the weakened portion serving as the cutting position is formed, and the external terminal is fixed to the insulating cap fixed to the curled portion of the capacitor case. With these configurations, even if the external terminal of the electrolytic capacitor is fixed, the external terminal and the sealing plate are not directly fixed, so the sealing plate can be deformed, and the sealing plate is deformed outward when the life of the electrolytic capacitor ends or is abnormal Then, the second lead plate can be cut at a fragile portion to be in an open state.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
Reference Example 1 FIG. 1 is a cross-sectional view of a state in which an electrolytic capacitor with a safety device is connected and fixed to a wiring bus bar.
A capacitor element 1 formed by winding or laminating an anode foil and a cathode foil with separator paper interposed between them was impregnated with an electrolytic solution and accommodated in a capacitor case 2. At that time, in order to fix the capacitor element in the capacitor case 2, a known fixing agent 15 may be used. The open end side of the capacitor case 2 is sealed by curling while the sealing plate 8 and the stretched state defining plate 7 are overlapped. A molded aluminum plate was used as the sealing plate 8.
[0015]
The external terminal 10 is electrically connected to the rivet 4 through the third lead plate 9. The external terminal 10 is fixed to the insulating cap 11. Further, the insulating cap 11 is fitted and fixed to a curled portion formed in the capacitor case 2 by a protruding portion 11 a provided on the insulating cap 11.
[0016]
The tension state defining plate 7 has a disk shape with the same outer dimensions as the sealing plate 8, and a through hole 7b is formed at the center thereof. The relay terminal 3 is fixed to the tension state defining plate 7 at a position corresponding to the rivet 4 fixed to the sealing plate 8. Further, a second lead plate guiding slit may be formed between the relay terminal 3 and the through hole 7 b of the tension state defining plate 7.
[0017]
The first lead plate 5 drawn out from the capacitor element 1 is fixed to the lower end side of the relay terminal 3 by a method such as washer caulking. Further, the second lead plate 6 is electrically connected from the lower end side of the relay terminal 3 to the lower end side of the rivet 4 fixed to the sealing plate 8. A weak spot is formed in the middle of the second lead plate 6. Further, a third lead plate is electrically connected from the upper end of the rivet 4 to the lower end side of the external terminal 10.
[0018]
In the electrolytic capacitor having the above configuration, the sealing plate 8 is deformed outward due to an increase in internal pressure due to generation of hydrogen gas due to leakage current, reverse application current, application of overvoltage, and the like. Here, since the external terminal 10 is provided on the insulating cap 11 and the external terminal 10 and the sealing plate are not directly fixed, the sealing plate 8 can be freely deformed even if the external terminal 10 is fixed. When the internal pressure further increases, the deformation of the sealing plate 8 is further increased, the tension on the second lead plate 6 connecting the relay terminal 3 and the rivet 4 is increased, and the second lead plate is cut at a fragile portion, The electrolytic capacitor becomes open.
[0019]
(Example 2) FIG. 3: is sectional drawing of the state which connected and fixed the electrolytic capacitor with a safety device by this invention to a wiring bus bar.
A protrusion 7 a is provided on the wall surface of the through hole 7 b of the tension state defining plate 7 at a position corresponding to the through hole 6 a of the second lead plate 6 having the through hole, and the protrusion is passed through the second lead plate 6. Through the hole 6 a, the lower end of the relay terminal 3 and the lower end of the rivet 4 are electrically connected by the second lead plate 6. Other structures are the same as in Reference Example 1.
[0020]
In the electrolytic capacitor of the present invention having the above-described configuration, the sealing plate 8 is deformed outward due to an increase in internal pressure due to generation of hydrogen gas due to leakage current, reverse applied current, overvoltage application, or the like. Here, since the external terminal 10 is provided on the insulating cap 11 and the external terminal 10 and the sealing plate are not directly fixed, the sealing plate 8 can be freely deformed even if the external terminal 10 is fixed. When the internal pressure further increases, the deformation of the sealing plate 8 is further increased, the tension on the second lead plate 6 connecting the relay terminal 3 and the rivet 4 is increased, and the second lead plate is cut at a fragile portion, The electrolytic capacitor becomes open. Then, the second lead plate 6 can be reliably separated at the protruding portion of the stretched state defining plate 7, and the cut second lead plate can be prevented from contacting.
[0021]
(Example 3) FIG. 4: is sectional drawing of the state which connected and fixed the electrolytic capacitor with a safety device by this invention to a wiring bus bar.
After the second lead plate 6 was inserted into the through hole 7b of the tension state defining plate 7, an extension 18 having a U-shaped cross section having elasticity was inserted therein. At this time, the tip of the extension 18 is pushed inward by the tension of the second lead plate 6. Other structures are the same as in Reference Example 1.
[0022]
In the electrolytic capacitor of the present invention having the above-described configuration, the sealing plate 8 is deformed outward due to an increase in internal pressure due to generation of hydrogen gas due to leakage current, reverse applied current, overvoltage application, or the like. Here, since the external terminal 10 is provided on the insulating cap 11 and the external terminal 10 and the sealing plate are not directly fixed, the sealing plate 8 can be freely deformed even if the external terminal 10 is fixed. When the internal pressure further increases, the deformation of the sealing plate 8 is further increased, the tension on the second lead plate 6 connecting the relay terminal 3 and the rivet 4 is increased, and the second lead plate is cut at a fragile portion, The electrolytic capacitor becomes open. Then, since the tension is lost by cutting the second lead plate 6, the tip of the extension 18 pressed by the second lead plate 6 is opened by the elastic force, and the cut second lead plate comes into contact. Can be prevented.
[0023]
(Example 4) FIG. 5: is sectional drawing of the state which connected and fixed the electrolytic capacitor with a safety device by this invention to a wiring bus bar.
The insulating cap 11 is provided with a projection having a caddy portion 11b at the tip end portion on the back side of the external terminal, and a projection having a caddy portion 11b at the tip portion at a position of the insulating plate 16 corresponding to the projection. Other structures are the same as in Reference Example 1. It should be noted that a cadence portion may be provided at the distal end portion of the projection portion of the insulating plate 16, and a claw portion may be provided at the distal end portion of the projection portion of the insulating cap 11, or a claw portion may be provided at the distal end portions of both projections.
[0024]
In the electrolytic capacitor of the present invention having the above-described configuration, the sealing plate 8 is deformed outward due to an increase in internal pressure due to generation of hydrogen gas due to leakage current, reverse applied current, overvoltage application, or the like. Here, since the external terminal 10 is provided on the insulating cap 11 and the external terminal 10 and the sealing plate are not directly fixed, the sealing plate 8 can be freely deformed even if the external terminal 10 is fixed. When the internal pressure further increases, the deformation of the sealing plate 8 is further increased, and the protruding portion of the insulating plate 16 is inserted into the protruding portion of the corresponding insulating cap 11 while the tip is narrowed, and the tab portion 16a of the insulating plate 16 is inserted into the insulating cap. The narrowed tip opens when the eleven quadruple portion 16a is exceeded. And the tension | tensile_strength to the 2nd lead board 6 which connects the relay terminal 3 and the rivet 4 increases, a 2nd lead board cut | disconnects in a weak place, and an electrolytic capacitor will be in an open state. Even if the internal pressure of the electrolytic capacitor decreases after the open state, the claw portion 16a of the insulating plate 16 and the caddy portion 11b of the insulating cap 11 have a fitting structure, so that they are cut without returning to the initial position. It is possible to prevent the second lead plate from coming into contact.
[0025]
Further, as shown in FIG. 6, the insulating cap 11 can fix the capacitor body by providing the mounting legs 19 on the outer peripheral portion thereof. Thereby, the capacitor body can be fixed without using a mounting band as a separate part as in the prior art.
[0026]
In addition, not only the configuration of the above embodiment, the material, shape, number of lead members, fixing method in each part, etc. to be used are designed to be optimal according to the rating and application of the electrolytic capacitor. It should be. As for the sealing plate, a molded aluminum plate was used, but other metal plates, rubber-coated phenolic resin plates, polypropylene resin, polyacetal resin, molded products of phenol resin, etc. warped outward due to an increase in internal pressure. What is necessary is just to design a material or thickness so that it can deform | transform.
[0027]
【The invention's effect】
As described above, the electrolytic capacitor according to the present invention includes, between the capacitor element and the external terminal, the first lead plate, the relay terminal fixed to the stretched state defining plate, the second lead plate provided with a fragile portion, the sealing Even if the external terminal is fixed, the electrolytic capacitor can be configured with a rivet fixed to the plate, a third lead plate, an insulating cap fixed at the curl portion of the capacitor case, and an external terminal fixed to the insulating cap. The electrolytic capacitor itself can be surely opened at the end of its life or when it is abnormal, which has a great industrial value.
[Brief description of the drawings]
1 is a sectional view of an electrolytic capacitor with a safety device. FIG. 2 is a sectional view of the electrolytic capacitor with a safety device shown in FIG. 1 in an open state. FIG. 3 is an electrolytic capacitor with a safety device according to an embodiment of the present invention. FIG. 4 is a sectional view of an electrolytic capacitor with a safety device according to another embodiment of the present invention. FIG. 5 is a sectional view of an electrolytic capacitor with a safety device according to another embodiment of the present invention. Insulated cap of the present invention provided FIG. 7 is a cross-sectional view of an electrolytic capacitor with a safety device disclosed in a conventional example. FIG. 8 is a cross-sectional view of the conventional electrolytic capacitor with a safety device shown in FIG. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Capacitor case 3 Relay terminal 4 Rivet 4a Metal rivet 4b Hollow rivet 5 1st lead board 6 2nd lead board 6a Through-hole 7 Extension state regulation board 7a Projection part 7b Through-hole 8 Sealing board 9 3rd Lead plate 10 External terminal 11 Insulation cap 11a Protruding part 11b Cad part 12 Bolt 13 Elastic packing 14 Elastic member 15 Fixing agent 16 Insulating board 16a Claw part 17 Wiring bus bar 18 Extension 19 Mounting foot

Claims

A capacitor case (2) containing the capacitor element (1), a first lead plate (5) for electrically connecting the capacitor element (1) and the relay terminal (3), a relay terminal (3), A second lead plate (6) for electrically connecting the rivet (4), a third lead plate (9) for electrically connecting the rivet (4) and the external terminal (10), and the capacitor A sealing plate (8) which is fixed to the open end side of the case (2) and seals the inside, and the second lead plate (6) and the third lead plate (9) are sealed plate (8). The rivet (4) to be fixed via a metal rivet (4a) and a hollow rivet (4b)
The second lead plate (6) can be cut by deforming the tension state of the second lead plate (6) toward the outside of the sealing plate (8) due to an increase in internal pressure in the capacitor case (2). In the electrolytic capacitor with a protective device in which the tension state defining plate (7) that prescribes the state is arranged on the back surface of the sealing plate (8),
One end of the second lead plate (6) is connected to the hollow rivet (4b), and the tension state defining plate (7) has a through hole (7b) narrower than the interval between the hollow rivets (4b). The second lead plate is inserted into the through hole, and one end is connected to the relay terminal (3),
The second lead plate (6) has a through hole (6a) serving as a fragile portion that defines the cutting position, and the tension state defining plate (7) faces the through hole (7b). Have
Further, the protruding portion (7a) of the tension state defining plate (7) is passed through the through hole (6a) of the second lead plate (6),
An electrolytic capacitor with a safety device, wherein an insulating cap (11) for fixing an external terminal is fitted and fixed to a lateral curl portion of the capacitor case.

A capacitor case (2) containing the capacitor element (1), a first lead plate (5) for electrically connecting the capacitor element (1) and the relay terminal (3), a relay terminal (3), A second lead plate (6) for electrically connecting the rivet (4), a third lead plate (9) for electrically connecting the rivet (4) and the external terminal (10), and the capacitor A sealing plate (8) which is fixed to the open end side of the case (2) and seals the inside thereof, and the second lead plate (6) and the third lead plate (9) are connected to an insulating plate (16). The rivet (4) to be fixed via a metal rivet (4a) and a hollow rivet (4b)
The second lead plate (6) can be cut by deforming the tension state of the second lead plate (6) toward the outside of the sealing plate (8) due to an increase in internal pressure in the capacitor case (2). In the electrolytic capacitor with a protective device in which the tension state defining plate (7) that prescribes the state is arranged on the back surface of the sealing plate (8),
One end of the second lead plate (6) is connected to the hollow rivet (4b), and the tension state defining plate (7) has a through hole (7b) narrower than the interval between the hollow rivets (4b). The second lead plate is inserted into the through hole, and one end is connected to the relay terminal (3),
The second lead plate (6) is formed with a fragile portion that defines the cutting position, and an insulating cap (11) for fixing the external terminal is fitted and fixed to the lateral curl portion of the capacitor case,
The extension state defining plate (7) described above has a through hole (7b), and the extension (18) having a U-shaped elastic cross section is narrowed at the tip by the second lead plate (6). The electrolytic capacitor with a safety device, which is inserted into the through hole (7b) of the tension state defining plate (7) in a state.

3. The electrolytic capacitor with a safety device according to claim 1 or 2, wherein the insulating cap (11) has a plurality of protrusions (11a) on an inner wall of the capacitor-side opening.

The tension state defining plate (7) described above has the same outer contour as the outer contour of the sealing plate (8), and the tension state defining plate (7) and the sealing plate (8) The electrolytic capacitor with a safety device according to claim 1 or 2, wherein the capacitor case (2) is fixed by a curled portion on an open end side in a superposed state.

An insulating plate (16) is provided on the insulating cap side of the sealing plate (8) described above, and the insulating cap (11) described above is provided with a protrusion having a claw portion or a caddy portion at the tip portion on the back surface side of the external terminal. And the projection which has a claw part or a claw part in a tip part is provided also in the position of the above-mentioned insulating board (16) corresponding to the projection, and a claw part and a cad part or a claw part fit in at the time of operation of a security device The electrolytic capacitor with a safety device according to claim 1 or 2, wherein the electrolytic capacitor is configured as described above.

3. The electrolytic capacitor with a safety device according to claim 1 or 2, wherein the insulating cap (11) is provided with a fixing foot (19) on an outer periphery.