Patent ID: 8524384

Claim:
A rechargeable battery, comprising: an electrode assembly, the electrode assembly including a positive electrode and a negative electrode; a case accommodating the electrode assembly; a cap plate coupled with the case, the cap plate having an inner surface that faces an interior of the rechargeable battery and having an outer surface parallel to the inner surface and facing away from the interior of the rechargeable battery; and a vent member welded to the cap plate, the vent member: including a notch thereon, having an inner surface that faces an interior of the rechargeable battery, and having an outer surface parallel to the inner surface and facing away from the interior of the rechargeable battery, wherein: a welded unit, by which the vent member and the cap plate are welded together, is separately formed toward a center of the cap plate in a thickness direction from the inner surface or the outer surface of the cap plate so as to be spaced apart from the inner surface or the outer surface of the cap plate, and the inner surface of the vent member is spaced apart from the inner surface of the cap plate and the outer surface of the vent member is spaced apart from the outer surface of the cap plate.