NOVELTY - Flexible-film primary battery comprises a battery assembly comprising: (a) a positive electrode plate (100) including a positive electrode collector; (b) a negative electrode plate including a negative electrode collector having a second conductive carbon layer (120) disposed on a surface-treated inner surface of a second pouch (110) and a negative electrode layer disposed on the second conductive carbon layer of the negative electrode collector; and (c) an adhesion/post-injection polymer electrolyte layer interposed between the positive electrode plate and the negative electrode plate.    USE - The flexible-film primary battery is useful for industrial applications.    ADVANTAGE - The flexible-film primary battery may be completely sealed using the pouch to improve a retention period and cell performance, where it is manufactured using simple and low-cost process.    DETAILED DESCRIPTION - Flexible-film primary battery comprises a battery assembly comprising: (a) a positive electrode plate (100) including a positive electrode collector having a first conductive carbon layer (120) disposed on a surface-treated inner surface of a first pouch (110) and a positive electrode layer (130) disposed on the first conductive carbon layer of the positive electrode collector; (b) a negative electrode plate including a negative electrode collector having a second conductive carbon layer disposed on a surface-treated inner surface of a second pouch and a negative electrode layer disposed on the second conductive carbon layer of the negative electrode collector; and (c) an adhesion/post-injection polymer electrolyte layer interposed between the positive electrode plate and the negative electrode plate, where the battery assembly is completely sealed. An INDEPENDENT CLAIM is a method of manufacturing a flexible-film primary battery, comprising forming a first conductive carbon layer on a surface-treated inner surface of a first pouch film to form a positive electrode collector, and forming a positive electrode layer on the first conductive carbon layer to form a positive electrode plate; forming a second conductive carbon layer on a surface-treated inner surface of a second pouch film to form a negative electrode collector, and forming a negative electrode layer on the second conductive carbon layer to form a negative electrode plate; inserting an adhesion/post-injection polymer electrolyte layer between the positive electrode plate and the negative electrode plate to manufacture a battery assembly; injecting an electrolyte into the polymer electrolyte layer of the battery assembly; and completely sealing the battery assembly to form a primary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a plan view of film primary battery.    Positive electrode plate (100)    Pouch (110)    Conductive carbon layer (120)    Positive electrode layer (130)    Electrode terminal (140)    Hot melting film (150)