Mitsubishi 5μm dry double-twist power battery separator

Mitsubishi 5μm dry double-twist power battery separator "major change"?

On September 4, Mitsubishi Chemical announced that the company has developed a thin high-strength PP porous membrane, which is a result of innovative research led by the Cabinet Science and Technology.

The products of this research adopt the dry double-drawing process, and carry out improvement and innovation on the basis of the original separator products. The new products can maintain the original insulation and ion permeability of the battery separator. The thickness of the material is 20 by the thickness of the original product. The -30μm is reduced to 5μm, and the puncture strength per unit thickness is increased by 2-3 times, and theoretically, the battery capacity can be increased by 20%.

It is understood that the concept of dry double pull is first proposed by the Chinese Academy of Sciences. From a theoretical point of view, it combines the advantages of dry single pull and wet method, and is a good separator technology. However, due to the difficulty in achieving the dry double-drawing process, it is very difficult to achieve stability and consistency. This is like the profoundness of Chinese medicine, but it is difficult to spread the same as Western medicine. So many years have passed, the dry double-drawing still does not occupy The mainstream status and involvement in enterprises are relatively small.

From the application of the domestic market, the dry double-leaf separator for power battery shipments is 12μm base film, and then coated according to the battery requirements of different material systems, 4μm, 8μm, etc. The thicker the coating. The dry film raw material polypropylene has a melting point of about 170 degrees, and the melting point will increase by several tens of degrees after coating, and the puncture resistance is further improved.

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