Nippon Chemi-con Corporation

Kentaro Nakaaki

Osamu Nakamura

Koichi Yoshida

Masashi Ozawa

Fusayoshi Endoh

An electrolytic capacitor according to the present invention employs a capacitor element wherein an anode foil having an anode internal terminal and a cathode foil having a cathode internal terminal are wound or laminated through a separator. The end of the anode foil faces with the cathode foil through the separator and the surface area of the cathode internal terminal is provided with an enlargement treatment, whereby the small area portion of the cathode foil that faces with the anode foil is eliminated, and the charge/discharge characteristics are thus improved. Furthermore, in the electrolytic capacitor provided with the capacitor element wherein the anode foil having the anode internal terminal and the cathode foil having the cathode internal terminal are wound or laminated through the separator, the capacitor element being impregnated with an electrolyte, the cathode internal terminal is composed of an aluminum material, the surface of the cathode internal terminal is etched and the concentration of iron in the etching layer is less than 300 ppm.

Electrolytic capacitor for use in a charge/discharge circuit with shorter period and greater voltage difference

Capacitor element ( ) formed by winding both anode and cathode electrode foils connected with lead terminal ( ) via a separator is placed in bottomed cylindrical shape outer case ( ) made of aluminum and the like. On the outer periphery of the round rod portion ( ) of the lead terminal is fitted tube ( ) made of a flexible material in a movable manner. The lead terminal fitted with the tube is drawn through sealing body ( ) fitted on the inner periphery of the opening of the outer case ( ) outside. The sealing body includes an elastic ring ( ) made of a flexible material, as fitted on the outer periphery of sealing plate ( ) made of a rigid material more rigid than the tube. The lead terminal fitted with the tube is inserted in each of a pair of through-holes ( ) provided on the sealing plate. Due to the pressure from the lead terminal during the insertion thereof in the through-hole, the tube deforms in an elongating fashion along the insertion direction, which works to allow the tube and the round rod portion to closely contact with each other and also allow the tube and the through-hole to closely contact with each other, so that the air tightness of the lead drawing part can be improved.

Growing community of inventors

Tokyo, Japan

Kentaro Nakaaki