Rechargeable battery

A rechargeable battery with improved safety is provided. The rechargeable battery comprises an electrode assembly, a case for housing the electrode assembly and a cap assembly for closing the case, the cap assembly comprising a cap plate and a vent member (160) between the electrode assembly and the cap plate. The vent member comprises two or more vent portions (167) arranged to open towards the cap plate to provide an opening through the vent member, wherein the vent member comprises a support portion (165) between the vent portions, each of the vent portions being arranged to bend relative to the support portion along a bend line (164).