Electrolytic capacitor

Details Electrolytic capacitor Electrolytic capacitor

1987-03-31

1988-09-06

Griffin, Donald A.

Electricity: electrical systems and devices

Miscellaneous

H01G 900

Patent

active

047697423

ABSTRACT:
An electrolytic capacitor which can be protected from rupture thereof due to an increased pressure of electrolytically generated hydrogen gas therein and can be continuously used over a long period of time, comprises an electrolytic liquid contained in a closed container, at least one pair of an anode foil and a cathode foil immersed in the electrolytic liquid, alternately superimposed on each other, coiled together and spaced apart by at least one insulating spacer to form an electrolytic capacitor, anode and cathode terminals being respectively connected to the anode and cathode foils and extending to the outside of the container, and a semipermeable membrane element arranged in a portion of the container and having at least one semipermeable membrane which exhibits, a hydrogen gas-permeating rate of 3.6 cm.sup.3 /cm.sup.2 .multidot.1000 hours or more determined at 50.degree. C. under a hydrogen gas partial pressure of 2 kg/cm.sup.2 and a water vapor-permeating rate of 2000 cm.sup.3 /cm.sup.2 .multidot.1000 hours or less determined at 50.degree. C. under a water vapor partial pressure of 1 kg/cm.sup.2 or less, to allow the permeation of hydrogen gas therethrough but not the permeation of the electrolytic liquid.

REFERENCES:
patent: 1969630 (1934-08-01), Sprague et al.
patent: 3647557 (1972-03-01), Kegelman
patent: 3852647 (1974-12-01), Ishii
patent: 3878440 (1975-04-01), Ando
patent: 4617611 (1986-10-01), Miura et al.

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