NOVELTY - Production of a polymer lithium ion battery comprises arranging a cathode sheet in a diagram bag; coating a layer of polypropylene, polyethylene, or polyvinylidene fluoride (PVDF) 2801, or a copolymer of PVDF and hexafluoropropylene on the diagram bag; arranging a layer of anode sheet with dual-layer coating on the diagram bag to form a cathode single battery; adhering a layer of anode sheets at the two sides of the diagram to form a cathode dual battery; assembling cathode dual batteries; and assembling the cathode dual battery and the cathode single battery.    USE - Method for the production of a polymer lithium ion battery (claimed).    ADVANTAGE - The lithium ion battery has high performance and long service life. The method avoids short-circuited phenomenon caused by the anode sheet and the cathode sheet of the battery. Manual operation in the assembling process of the battery and the effect of the personal element for the quality of the battery is reduced. The method ensures reduced producing cost and safety performance of the battery.    DETAILED DESCRIPTION - Production of a polymer lithium ion battery comprises:    (A) arranging a cathode sheet in a diagram bag;    (B) coating a layer of polypropylene, polyethylene, or PVDF 2801, or a copolymer of PVDF and hexafluoropropylene on the diagram bag;    (C) arranging a layer of anode sheet with dual-layer coating on the diagram bag to form a cathode single battery;    (D) adhering a layer of anode sheets with dual-layer coating and an anode sheet with single-surface coating at the two sides of the diagram to form a cathode dual battery;    (E) assembling cathode dual batteries to form a group;    (F) arranging a cathode dual battery on the two sides of the cathode dual battery group respectively; and    (G) assembling the cathode dual battery and the cathode single battery.    The anode sheet comprises an anode material of formula Li2MSiO4 including lithium cobaltite or lithium manganic acid, lithium nickelate, lithium iron phosphate, lithium ferrovanadium phosphate, or lithium ferrous silicate.    M=transitional element such as Co, Ni, Fe, or Mn.