A secondary battery according to an embodiment of the present invention comprises: an electrode assembly formed by disposing a first and a second electrode, each having a coated part and uncoated part tabs, on both sides of a separator; a case for receiving the electrode assembly; a cap plate coupled to an opening of the case and electrically connected to the uncoated part tabs of the second electrode; a first electrode terminal installed in the cap plate while being electrically insulated therefrom, and connected to the uncoated part tabs of the first electrode; a second electrode terminal bonded to the cap plate with an insulating film interposed therebetween; and an overcharge safety device electrically connecting the cap plate and the second electrode terminal, and electrically disconnecting the cap plate and the second electrode terminal when the battery is overcharged.