Electric double-layer capacitor

摘要

The invention provides an electric double-layer capacitor sealed up by a flexible casing material that ensures a release of pressure upon an increasing internal pressure. A pressure release valve ( 1 ) is attached to the flexible casing material. The pressure release valve ( 1 ) comprises a collar airtightly joined to the flexible casing material and a cylindrical portion ( 3 ) connected to the collar, extending out of a capacitor enclosure. The cylindrical portion ( 3 ) comprises an end part ( 5 ) having a self-closing passage ( 6 ) that is opening to the outside only upon a pressure release and is closed up in a normal state, and a channel ( 4 ) in communication with the interior of the capacitor enclosure.