NOVELTY - The pouch-type flexible film battery comprises a cathode structure (200) including a cathode pouch, a cathode conductive carbon layer (220) and a cathode layer (230), an anode structure (100) including an anode pouch, an anode conductive carbon layer (120) and an anode layer (130), and a polymer electrolyte layer between the cathode and anode structures. The polymer electrolyte layer is a gel-type electrolyte including a cellulose-based polymer, and comprises a polymer matrix including the cellulose-based polymer and a strength reinforced polymer.    USE - Used as a pouch-type flexible film battery.    ADVANTAGE - The pouch-type flexible film battery can be simply, economically and continuously manufactured with improved durability and bonding characteristics.    DETAILED DESCRIPTION - The pouch-type flexible film battery comprises a cathode structure (200) including a cathode pouch, a cathode conductive carbon layer (220) and a cathode layer (230), an anode structure (100) including an anode pouch, an anode conductive carbon layer (120) and an anode layer (130), and a polymer electrolyte layer between the cathode and anode structures. The polymer electrolyte layer is a gel-type electrolyte including a cellulose-based polymer, and comprises a polymer matrix including the cellulose-based polymer and a strength reinforced polymer. A weight ratio between the cellulose-based polymer and the strength reinforced polymer is 1:99-99:1. One of the cathode and anode pouches has an inner layer having hydrophilicity by a surface treatment, and comprises an outer layer and an intermediate layer disposed between the inner layer and the outer layer. The cathode conductive carbon layer or the anode conductive carbon layer is coated on a surface-treated surface of the inner layer. The outer layer and the inner layer are polymer film layers. The intermediate layer is a metal layer or a mixed layer of a metal and a polymer film. The cathode pouch and the anode pouch comprise the inner layers directly contacted by heat fusion. An INDEPENDENT CLAIM is included for a method of manufacturing a pouch-type flexible film battery.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic perspective view of a pouch-type flexible film battery.    Anode structure (100)    Anode conductive carbon layer (120)    Anode layer (130)    Cathode structure (200)    Cathode conductive carbon layer (220)    Cathode layer. (230)