Battery and method of assembling battery

摘要

A battery is a sealed battery (10) that includes a casing (18) made of metal, and a safety valve (30) made of a thin plate. The casing (18) of the battery (10) has a vent hole (25) that provides communication between the inside of the battery (10) and the outside of the battery (10). The safety valve (30) closes the vent hole (25) of the casing (18). The battery (10) is closed such that the seal member (28) is provided between the peripheral edge portion around the vent hole (25) and the peripheral edge portion of the safety valve (30), and the peripheral edge portion around the vent hole (25) does not contact the peripheral edge portion of the safety valve (30).