A rechargeable battery includes: an electrode assembly having a first electrode and a second electrode; an electrode terminal electrically connected to the electrode assembly; a case that receives the electrode assembly; a cap plate at an opening of the case, the cap plate closing and sealing the case and having a vent hole configured to discharge an internal pressure of the case; and a vent module including a vent portion, the vent portion including a buffer portion configured to buffer an impact that is transferred to the vent hole, and a fracture portion that closes and seals the vent hole, wherein the fracture portion is configured to be fractured by the internal pressure.