ELECTRICAL ACCUMULATOR DEVICE

摘要

Provided is an electrical accumulator equipped with: an electrode group comprising a first electrode, a second electrode, and a separator electrically insulating the first electrode from the second electrode; an electrolyte; a case housing the electrode group and the electrolyte and having an opening; and a sealing plate for sealing the case opening. The sealing plate has a degassing valve. The degassing valve has a circular breakaway portion. The breakaway portion has a first groove portion, a second groove portion, and a third groove portion that are shaped as straight lines. First end portions of the first groove portion, the second groove portion, and the third groove portion meet at the center of the breakaway portion.