A rechargeable battery according to an exemplary embodiments includes: an electrode assembly; a case configured to accommodate the electrode assembly and having an opening at one side thereof; and a cap assembly including: a cap plate configured to close and seal the opening of the case, the cap plate having a vent portion and defining a vent opening that is configured to discharge an internal gas generated inside the case to the outside of the case, the vent portion comprising: a vent plate configured to close and seal the vent opening; and a bending portion that is raised from the vent plate; and an electrode terminal at an upper portion of the cap plate and electrically connected to the electrode assembly.