Since the solid electrolyte is used instead of the liquid electrolyte, the polymer lithium ion battery has the advantages of being thinner, arbitrarily aread, and arbitrarily shaped compared with the liquid lithium ion battery, so that the battery casing can be fabricated from the aluminum-plastic composite film, thereby It can improve the specific capacity of the whole battery; the polymer lithium ion battery can also use the polymer as the positive electrode material, and its mass specific energy will be increased by more than 20% compared with the current liquid lithium ion battery. The polymer lithium ion (Polymer Lithium-Ion Battery) battery is characterized by miniaturization, thinning, and weight reduction. Therefore, the market share of polymer batteries will gradually increase.