NOVELTY - The lithium ion secondary battery comprises an anode electrode including a first positive electrode active material that coated on a current collector and a first coating portion formed at an end of a non-coating portion of the collector. A cathode electrode includes a negative electrode active material that is coated on a second coating portion and a second current collector. A jelly roll type separator is arranged between the anode electrode and the cathode electrode in an electrode assembly. A battery case accommodates the electrode assembly.    USE - The lithium ion secondary battery is useful as a medium-to-large-sized secondary battery for an electric vehicle.    ADVANTAGE - The battery prevents the penetration of the micrometal foreign substance, so the productivity of the battery is improved without fault generation and without requiring a separate cleaning process.    DETAILED DESCRIPTION - The lithium ion secondary battery comprises an anode electrode including a first positive electrode active material that coated on a current collector and a first coating portion formed at an end of a non-coating portion of the collector. A cathode electrode includes a negative electrode active material that is coated on a second coating portion and a second current collector. A jelly roll type separator is arranged between the anode electrode and the cathode electrode in an electrode assembly. A battery case accommodates the electrode assembly. The anode electrode and the cathode electrode are coupled to an anode electrode lead welding portion and a cathode electrode lead welding portion. A connecting portion connects the anode electrode coating portion of the anode electrode lead welding portion with a fusing unit to fuse upper and lower portions of the coating portion in a non-adhesive polymer film, where a melting point of the non-adhesive polymer film is 130 degrees C and is made of ethylene acrylate, polyester, polypropylene or polyurethane. A non-stick macromolecular film is fusioned in a fusion portion on an uncoated area of the anode electrode, where the film has a longitudinal extent of 5-40 mm and the thickness of 0.2-0.5 mm. An INDEPENDENT CLAIM is included for manufacturing a lithium ion secondary battery.