Abstract: 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.

Abstract: 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.

Abstract: An electrolytic capacitor 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 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, improving the charge/discharge characteristics. 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 includes an aluminum material, the surface of the cathode internal terminal is etched and iron concentration in the etching layer <300 ppm.

Abstract: Capacitor element (20) formed by winding both anode and cathode electrode foils connected with lead terminal (10) via a separator is placed in bottomed cylindrical shape outer case (30) made of aluminum and the like. On the outer periphery of the round rod portion (12) of the lead terminal is fitted tube (100) made of a flexible material in a movable manner. The lead terminal fitted with the tube is drawn through sealing body (110) fitted on the inner periphery of the opening of the outer case (30) outside. The sealing body includes an elastic ring (113) made of a flexible material, as fitted on the outer periphery of sealing plate (112) 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 (111) provided on the sealing plate.