Independent research and development of domestic high-end diaphragm instead of imports into reality

Lithium batteries, mainly used in electric vehicles, have a huge market space. But for many years most of the domestic lithium battery high-end diaphragm material basically rely on imports or imported production lines. Li xin and his team have been working hard for 10 years to make the self-developed high-end domestic diaphragm substitute for imports a reality.

Li xin, a welding major, has been in the lithium battery industry for nearly 20 years. With the upgrading of lithium battery shell material, li xin realized very early that their original explosion-proof membrane would be phased out sooner or later, but lithium battery has a broad space for development.

Since 2004, he has been involved in the development and testing of wet membranes. "The lithium battery is mainly composed of four parts, the positive electrode, the negative electrode, the diaphragm and the electrolyte. Li xin said that at that time, the domestic market, positive and negative technology has been relatively mature. But there are no qualified diaphragm manufacturers, "lithium batteries, the most difficult to do is the diaphragm, so we set the target on the diaphragm."

In 2010, li xin with donggao film company settled in baodi district, formally entered the diaphragm field. "From the initial research and development of PE diaphragm, we have marked the industry leader -- Japan asahi chemical company. Their product has an advanced HIPORE structure with an average pore diameter of 80-120 nm.

In recent years, donggao film company has been focusing on the research and development of the most advanced products, which determine the excellent performance of the products, thus the structure design of the products, as well as the technology and equipment to achieve the structure smoothly. In view of the stretching system, which is an important process in the production of base film, donggao film company takes the lead in developing and applying the synchronous bidirectional stretching process. According to li xin, the synchronous double-pull process can make the product's hole formation more uniform and the microstructure of the product more consistent, which means that the product's performance is more stable.

In addition to mastering the core technology, donggao film company also independently integrated the automatic production line. "Our production line has the advantage of high speed and wide width." The length of the base film is nearly 200 meters, and the vehicle speed can be stable at 60 meters per minute, li said.

According to the introduction, some domestic imports of base film production lines, the speed of about 25-30 meters/min. "At present, our production capacity of a single production line can reach 70 million square meters per year, which is twice as much as theirs." 'the input-output ratio has been increased and the cost advantage has been obvious,' Mr. Li said.

"At present, shenzhen bick battery, foster and other cylindrical lithium battery enterprises have batch application of our coating composite diaphragm. Li xin said, after 10 years of independent research and development, pilot test, the accumulation of mass production, donggao membrane company mastered the industry's leading technology, to achieve the import of high-end diaphragm material replacement.

The page contains the contents of the machine translation.