Pouch-Shaped Secondary Battery Having Protective Film With Improved Adhesion and Method of Manufacturing the Same

A pouch-shaped secondary battery includes a case configured to have a laminate sheet structure, an electrode assembly received in the case, an electrode tab extending from the electrode assembly, an electrode lead having one side connected to the electrode tab and the other side protruding out of the case, and a protective film located on an upper surface and a lower surface of a weld of the electrode tab and the electrode lead. The protective film includes an ethylene-vinyl acetate copolymer (EVA)-based adhesive layer disposed in tight contact with the surface of the weld and a support layer located on one surface of the adhesive layer, the support layer being made of at least one of polypropylene (PP), cast polypropylene (CPP), or polyethylene terephthalate (PET). A method of manufacturing the pouch-shaped secondary battery is also provided.