Method of Manufacturing Pouch-Shaped Battery Cell Using Protective Film and Pouch-Shaped Battery Cell Manufactured Using the Same

Disclosed is a method of manufacturing a pouch-shaped battery cell, the method including (a) receiving an electrode assembly in a preliminary battery case and sealing other outer peripheries of the preliminary battery case excluding a first side outer periphery of the preliminary battery case, through which gas is discharged, (b) attaching a protective film to at least one corner portion of an electrode assembly receiving portion, (c) performing an activation process and a degassing process, (d) resealing a first side outer periphery of the electrode assembly receiving portion, and (e) removing the protective film, wherein the inner surface of the protective film is attached to the outer surface of the corner portion of the electrode assembly receiving portion in tight contact therewith without being crumpled in order to support the shape of the corner portion of the electrode assembly receiving portion, which is technology capable of preventing the preliminary battery case from being deformed by force continuously applied to the preliminary battery case in a process of manufacturing the pouch-shaped battery cell.