BATTERY

To provide a battery in which a release valve works reliably.SOLUTION: According to an embodiment, a battery includes an exterior part and an attachment member. The exterior part stores an electrode group, and the attachment member is attached to the exterior part. The exterior part includes: a release valve released when a pressure in an internal cavity reaches a predetermined pressure; and a first extension extended on the periphery of the release valve. The exterior part includes a second extension which has one end connected to the first extension and which crosses the first extension. The attachment member abuts on the second extension from a side opposite to a side where the release valve is located in a direction along the first extension.SELECTED DRAWING: Figure 3 【課題】開放弁が確実に作動する電池を提供すること。【解決手段】実施形態によれば、電池は、外装部及び装着部材を備える。外装部は、電極群を収納し、装着部材は、外装部に取付けられる。外装部は、内部空洞の圧力が所定の圧力に到達することにより開放される開放弁と、開放弁の周縁に延設される第１の延設部と、を備える。外装部は、一端が第１の延設部に接続されるとともに、第１の延設部に対して交差する第２の延設部を備える。第１の延設部に沿う方向について開放弁が位置する側とは反対側から装着部材が第２の延設部に当接する。【選択図】図３