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(1) Very high barrier

The transmittance of water vapor shall be less than 1× 10-4~1× 10– 6g/m2

d1atm； The oxygen transmittance shall be less than 1× 10-1~1× 10-3g/m2

d1atm； This requirement is about 10000 times higher than that of ordinary aluminum-plastic composites.

It can be seen that the aluminum foil thickness of general flexible packaging materials should be greater than 30um to prevent the slow penetration of water vapor. Therefore, it is difficult for common composite materials to meet the requirements. Generally, thicker aluminum foil is used, and 3-7 layers of composite structure are required, and various composite methods are comprehensively applied. The structure of flexible packaging materials generally includes the following three types:

a:ON/AL/CPP； b:PET/ON/AL/CPP； c:PET/AL/PET/EMAA

A and b are more suitable for forming packaging. C Structure is only suitable for general packaging.

(2) Good heat sealing performance

The polymer lithium ion battery is sensitive to high temperature, and the general service temperature is lower than 60 ℃. This requires that the lower the heat sealing temperature of the flexible packaging material on the basis that the heat sealing strength meets the requirements, the better the heat sealing temperature. In general, the heat sealing strength cannot be less than 35N/15mm, and the heat sealing temperature cannot be higher than 150 ℃. If a higher temperature is used, the cooling measures must be taken. Generally, the heat sealing time should not exceed 3s to prevent thermal radiation and heat conduction from damaging the cell.

(3) The inner layer material does not react with the electrolyte The inner layer material of the flexible packaging material can neither be dissolved by the electrolyte nor be swelled by the electrolyte. If the inner material is dissolved by the electrolyte, the dissolved components will undergo chemical reaction and gas will appear; If the inner material is swelled by the electrolyte, it will change the concentration or composition ratio of the electrolyte and affect the performance of the cell.

The electrolyte used in the polymer is an organic electrolyte composed of a variety of lipids. The lithium salt in the electrolyte will decompose into highly acidic hydrofluoric acid in the presence of water. This requires that the bonding layer between the inner material and the aluminum foil is not affected by the hydrofluoric acid in the electrolyte and the electrolyte, so as to prevent the separation of the inner material and the aluminum foil from affecting the barrier of the packaging material. At present, the inner layer of flexible packaging materials and the composite layer of aluminum foil produced by many Japanese manufacturers use a special adhesive resistant to electrolyte and hydrofluoric acid to prevent the material from peeling off after being soaked in electrolyte. The peeling strength of aluminum foil and the inner layer directly affects the sealing performance of the battery.

(4) The production process of polymer lithium-ion batteries with good ductility, flexibility and mechanical strength has put forward higher requirements for the flexibility of packaging materials. Now the widely used cold-pressing packaging methods also put forward higher requirements for the ductility of packaging materials. The safety guarantee in the use process also puts forward higher requirements for the mechanical strength of flexible packaging materials.

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