Difficulties in Aluminum Foil Bag Packaging Technology.Aluminum foil bag company

Firstly, the barrier requirements of flexible packaging materials are 10000 times higher than those of ordinary aluminum foil bag composite materials, which cannot be met with ordinary composite materials and composite technologies. It is generally necessary to use extremely thick aluminum foil and composite materials with a structure of 4 to 7 layers, comprehensively applying various composite technologies.

For example, in the production process of the same material, it may be necessary to simultaneously use dry lamination, extrusion lamination, continuous extrusion lamination, three-in-one extrusion, hot lamination or salivation lamination, multi-layer co extrusion, etc. In this way, high requirements are put forward for the production technology of flexible packaging materials.

Secondly, the selection of composite inner layer heat sealing materials. The electrolyte used in polymer lithium-ion batteries is an organic electrolyte composed of various esters, where the electrolyte hydrolyzes into highly acidic substances in the presence of water. According to the principle of similar solubility, ester based organic compounds have the ability to swell with most heat sealing materials, do not react with electrolytes, and must have strong acid resistance. It is difficult to find low melting point heat sealing materials.

Furthermore, the design of packaging materials is difficult. In the process of designing flexible packaging materials, it is necessary to ensure that the above requirements are met, while also ensuring that the production of flexible packaging materials can be achieved. It is also necessary to consider the impact of flexible packaging materials on polymer lithium-ion batteries and the development trend of polymer lithium-ion batteries (in order to continuously develop the required flexible packaging materials in advance), and the difficulty is high.

Finally, the quality judgment cycle for flexible packaging materials is long. Due to the water resistance required for polymer lithium-ion batteries. The oxygen resistance performance exceeds the minimum accuracy of testing instruments in the packaging field, making it difficult to quantitatively test the developed flexible packaging materials. The final judgment method for actual packaged batteries is generally used now. Based on the inspection characteristics of batteries and the degree and rate of impact of soft packaging materials on batteries, it is generally necessary to continue the experiment for more than three months to determine the final qualification of soft packaging materials.

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