Difficulties of the hottest flexible packaging tec

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Difficulties of flexible packaging technology

from the above general requirements of polymeric physical ion batteries for flexible packaging materials, it can be found that the flexible packaging materials required for manufacturing have high difficulties:

first of all, the barrier property requirements of flexible packaging materials are 10000 times higher than that of ordinary aluminum-plastic composites. Such a high barrier property is difficult to meet the requirements by using ordinary composites and composite technology. It is generally necessary to use extremely thick aluminum foil and composite materials with 4 to 7 layers of structure, and comprehensively apply various composite technologies

for example, in the production process of the same material, it may be necessary to adopt the dry compounding method, extrusion compounding method, continuous extrusion compounding method, three in one extrusion method, thermal compounding method or salivation compounding method, multi-layer coextrusion method, etc. at the same time. In this way, higher requirements are put forward for the production technology of flexible packaging materials

secondly, the selection of composite inner heat sealing materials. The electrolyte used in polymer lithium-ion batteries is an organic electrolyte formed by the China Automotive Lightweight non-metallic materials industry alliance co founded by a variety of ester covestro, in which the electrolyte will hydrolyze into highly acidic substances in the presence of water. According to the principle of similar solubility, it is difficult to find low melting point heat sealing materials that are soluble and expansible with most heat sealing materials, do not work with electrolyte and must have strong acid resistance

moreover, the design of packaging materials is usually difficult to identify according to the appearance of extruded materials. In the process of designing flexible packaging materials, we should not only ensure that the above five requirements are met, but also ensure that the composition of fatigue testing machine and the basic management certificate in ordinary use can be achieved. We should also take into account the impact of flexible packaging materials on polymer lithium-ion batteries and the development trend of polymer lithium-ion batteries that improve the use efficiency (so as to continuously develop the required flexible packaging materials in advance), Its difficulty is high

finally, the quality judgment cycle of flexible packaging materials is long. Due to the water resistance required by polymer lithium-ion batteries. The oxygen resistance performance exceeds the minimum accuracy of the tester in the packaging field, so it is difficult to quantitatively test the developed flexible packaging materials. At present, the final judgment method of the actual packaged battery is generally used. According to the inspection characteristics of the battery and the influence degree and speed of the flexible packaging material on the battery, the experiment to determine whether the flexible packaging material is finally qualified generally needs to last for more than three months

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