NOVELTY - The secondary battery comprises a cylindrical can (2) for accommodating an electrode assembly and an electrolyte, a cap assembly (1) mounted on the can, a first metal foil attached on a top surface of the cap assembly or a bottom surface (2a) of the can, a circuit protection element attached on the first metal foil, a second metal foil attached on the circuit protection element, and a supporting member disposed on a side of the circuit protection element. The secondary battery has a cylindrical shape and a capacity greater than or equal to 2000 mAh or an output of greater than or equal to 14000 mA. The first metal foil has a disc shape.    USE - The rechargeable secondary battery is useful in portable electronic information devices such as mobile phones, notebook computers, electronic dictionaries, and electric devices such as electric bicycles, electric scooters and electric drills.    ADVANTAGE - The secondary battery is safe to use, and has high-output or capacity characteristics, improved performance, increased electrical resistance and reduced current voltage characteristics.    DETAILED DESCRIPTION - The secondary battery comprises a cylindrical can (2) for accommodating an electrode assembly and an electrolyte, a cap assembly (1) mounted on the can, a first metal foil attached on a top surface of the cap assembly or a bottom surface (2a) of the can, a circuit protection element attached on the first metal foil, a second metal foil attached on the circuit protection element, and a supporting member disposed on a side of the circuit protection element. The secondary battery has a cylindrical shape and a capacity of greater than or equal to 2000 mAh or an output of greater than or equal to 14000 mA. The first metal foil has a disc shape and a ring shape. The second metal foil: is configured such that a portion of the second metal foil does not overlap the circuit protection element; has a shape for covering the circuit protection element and the supporting member, a partially-cut disc shape corresponding to the circuit protection element and the supporting member and a shape corresponding to a combination of the circuit protection element and the supporting member; and is welded to an external tab for electrical connection. A portion of the second metal foil extends toward a central axis of the cylindrical can from the circuit protection element. The circuit protection element is a positive temperature coefficient element or a thermal fuse, and has a partial ring shape, a partially-cut ring shape corresponding to the ring shape of the first metal foil and a partially-cut disc shape corresponding to the disc shape of the first metal foil. The supporting member is an electrical insulator, is present in surface-contact with a portion of the second metal foil, and has a shape corresponding to a portion of a hole formed in the partial ring shape and the partially-cut ring shape of the circuit protection element and a disc shape cut on two sides. The circuit protection element, the supporting member and the second metal foil are configured such that a portion of a surface of the first metal foil is exposed. A portion of the second metal foil corresponding to the supporting member is welded to the external tab. An INDEPENDENT CLAIM is included for a method of manufacturing a secondary battery.    DESCRIPTION OF DRAWING(S) - The diagram shows a perspective view of a secondary battery.    Cap assembly (1)    Cylindrical can (2)    Bottom surface of the cylindrical can (2a)    Circuit protection assembly. (10)