Domestic lithium batteries for ten years to wear a sword instead of imported goods

Lithium batteries, which mainly use electric vehicles, have huge market space. However, for many years, most of the high-end diaphragm materials of domestic lithium batteries have basically relied on imports or imported production lines. Li Xin and his team have worked hard for 10 years to make self-developed domestic high-end diaphragm substitution imports a reality.

Li Xin, who studied welding, has been working in the lithium battery industry for nearly 20 years. With the upgrade of the material of the lithium battery shell, Li Xin realized very early that the anti-explosion film they originally produced would be eliminated sooner or later, but the lithium battery has a vast space for development.

So since 2004, he has begun to involve the development and testing of the wet septum. "Lithium batteries mainly consist of four parts, positive, negative, diaphragm and electrolyte. Li Xin said that at that time, the technology of positive and negative poles was relatively mature in the domestic market. However, there are no qualified diaphragm manufacturers. "In lithium batteries, the most difficult to handle is the diaphragm, so we set the target on the diaphragm."

In 2010, Li Xin took Dongyi Film Company to settle in Baodi District and formally entered the diaphragm field. "Since the initial development of PE diaphragm, we have marked the industry's leader-Japan Xuhua became a company. Their products have advanced HIPRE structures with an average aperture of 80-120 nm. "

For the most advanced products, the excellent performance of the products has been determined, and the structural design of the products, as well as the process and equipment that can successfully achieve this structure, have been the focus of research and development of Donggao Membrane Company in recent years. In order to develop and apply the synchronous bidirectional tensile process, Donggao Film Company has taken the lead in developing and applying the tensile system, which is an important process in the production of substrate. Lixin said that the synchronous double pull process can make the product tensile holes more uniform, product microstructure consistency is better, that is, product performance is more stable.

While mastering the core technology, Donggao Film Company has also integrated its own fully automatic production line. "Our production line has the advantages of high speed and wide width. Li Xin said that the length of the basement membrane is nearly 200 meters, and the speed can be stable at 60 meters per minute.

According to the introduction, some imported basement production lines in China are about 25-30 meters/minute. "At present, we can produce 70 million square meters per year on a single line, which is twice as much as they do. ` Input-output is bigger, the cost advantage is more obvious, and it is more suited to the low-cost trend of popular demand for power TVs and electric vehicles, 'Mr. Li said.

"At present, Shenzhen Bic Battery, Foster, and other cylindrical lithium electric enterprises have applied our company's coating composite diaphragm in bulk. Mr. Li said that after 10 years of autonomous research and development, pilot and mass production, Donggao Membrane had mastered the industry's leading technology and achieved the import substitution of high-end diaphragm materials.

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