Abstract: A capacitor structure for dissipating heat, for example, generated by high ripple currents. The capacitor includes an outer casing of substantially annular cross section comprising an outer side wall, a bottom and an interior tube integrally formed from a substantially continuous piece of thermally conductive material. A capacitor winding of substantially annular cross section is disposed within the outer casing which is sealed at a top. The capacitor winding may be in close thermal contact with the inner tube, the bottom and the outer side wall to improve heat dissipation.

Abstract: An electrolytic capacitor having a wound foil capacitor section, preferably aluminum foil, contains as electrolyte a solution of 3 to 10 wt % ammonium benzoate, 4 to 16 wt % water, and 75 to 93 wt % ethylene glycol which has a resistivity of 385 to 620 ohm-cm and provides a capacitor capable of operating above 100 V and above 85.degree. C. A nitro compound and a phosphate may also be present. The electrolyte is particularly suited for operation above 200 V and 95.degree. C. and higher.