Importance

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Abstract

A packaged hybrid capacitor according to the invention includes a metal cup having a bottom wall with a periphery and an upstanding sidewall at the periphery and surrounding the bottom wall; a first capacitor electrode located within the sidewall and on the bottom wall of the metal cup; an endless electrically insulating plastic sealing member having a base and an outer wall upstanding from the base, disposed within the metal cup, the outer wall having a shape and size fitting within the cup, adjacent the sidewall of the cup; a metal cover including a top wall and a peripheral skirt extending from and surrounding the top wall and inclined relative the top wall toward an inside surface of the metal cover; a second capacitor electrode on the inside surface of the top wall; a separator disposed between the first and second electrodes; and an electrolyte within the capacitor and in contact with the first and second capacitor electrodes, wherein the sidewall of the metal cup bears against the peripheral skirt, with the outer wall of the sealing member interposed between the sidewall and the peripheral skirt, sealing the packaged hybrid capacitor and electrically insulating the metal cup from the metal cover. The sealing member preferably has a channel shape, in cross-section, including an inner wall opposite the outer wall that is captured between the skirt of the cover and the sidewall of the cup. The sealing member is preferably a plastic polymeric material such as polytetrafluoroethylene, polyethylene, polypropylene, silicone rubber, natural and synthetic rubbers, elastomers, polyvinyl chloride, and a moldable elastomer-polymer blend.

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First Claim