Secondary battery and method of insulating outer surface of secondary battery

A secondary battery and a method of insulating outer surfaces of a secondary battery. A secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate; a case having an internal space in which the electrode assembly is accommodated; a cap plate covering the case; a terminal penetrated through the cap plate and electrically connected to the electrode assembly; and an adhesive tape adhered on outer surfaces of the case.