Patent ID: 9716260
Date: 2017-07-25
CPC Classifications: H01M,Y02E,Y02P

Claim:
1. A battery case in which a breakage groove for a safety valve is formed in a plate part constituting any surface of a case formed by machining a metal plate, the battery case comprising: a first recessed part, which is indented inward with respect to the case and is formed in the plate part, and wherein the breakage groove is formed in a middle or substantially the middle of a bottom part of the first recessed part, a first connecting portion and a second connecting portion connect to the first recessed part on both sides flanking the first recessed part in the plate part, at least one of the first connecting portion and the second connecting portion is constituted by a folded portion in which the plate part is folded multiple times in a thickness direction thereof, and a portion in the folded portion that overlaps a case-outer-side surface of the plate part is set apart by a gap from the case-outer-side surface of the plate part.