Driven by strong demand in markets such as the rapid development of new energy vehicles, the global lithium battery separator market is growing rapidly. After several years of development, the domestic low-end lithium battery market application field has basically recognized the domestic diaphragm products, the dry diaphragm has basically completed the import replacement, but due to the high barriers in the production technology of the wet diaphragm, the production line construction period is long and up to Production time and actual production capacity are not easy to determine. Most of the high-end wet-process separators still rely on imports. More than 60% of the mid-to-high-end market is still occupied by foreign diaphragm manufacturers such as the United States and Japan. Domestic enterprises began to layout wet law dependence on imports is still serious With the end of 2016, the Ministry of Finance, the Ministry of Industry and Information Technology, the Ministry of Science and Technology and the National Development and Reform Commission jointly issued the "Notice on Adjusting the Financial Subsidy Policy for the Promotion and Use of New Energy Vehicles", using battery energy density as an important indicator of subsidies, and ternary batteries have become the strategic layout of lithium-ion enterprises. An important position. The ternary battery pursues the unification of high capacity and safety, and requires the product to be light and thin, and the wet diaphragm is the best choice. In order to adapt to the development of the industry and seize the middle and high-end market, domestic lithium battery separator companies have laid out wet diaphragms. 2016 is a year of full bloom for wet diaphragms, and companies are building production lines. According to the announcement issued by the relevant enterprises in 2017, the current capacity of the wet diaphragm of Luzhou Mingzhu has reached 55 million square meters, and will continue to be heavy in 2017; Xingyuan Materials will start production of two wet production lines in the first half of 2017, adding new wet method. The production capacity is 40 million square meters; Sinoma Technology has also introduced the latest wet biaxial stretching technology with better performance. Domestic companies have started production and expanded production capacity to cope with the demand for wet diaphragms in the new energy auto industry market, but the actual situation is not as optimistic as imagined. As far as the wet-membrane supply and demand market is concerned, the wet-process separators are still heavily dependent on imports. So, what are the specific difficulties in the localization of wet diaphragm? Three major difficulties in domestic wet diaphragm Difficulties: Insufficient research and development capabilities of matrix materials plague product autonomy The stability of the matrix material directly affects the performance of the membrane. The lack of research and development capabilities of matrix raw materials is currently the main problem in the production of wet diaphragms in China. The matrix materials include polypropylene, polyethylene and additives. International diaphragm suppliers such as Asahi Kasei, Pyrotechnics, and Celgard in the United States have their own polymer research labs that can independently develop and produce matrix materials. However, the current situation in China is the lack of research and development of matrix materials in the upstream industrial chain, and the lack of research and development capabilities of the diaphragm companies themselves on the matrix materials, resulting in the majority of the base materials of most enterprises are outsourcing. The lack of independent research and development strength, resulting in the wet diaphragm material is subject to people. Difficulties 2: Precision control does not affect product consistency The wet diaphragm production process is divided into six major systems: dosing and dosing systems, extrusion mixing systems, cast cooling systems, stretching systems, winding systems, and washing and drying systems. Each system needs high precision guarantee during operation, and the lack of precision control ability causes uneven thickness of the wet diaphragm, the micropore state is not easy to appear, and the porosity becomes large, resulting in poor diaphragm consistency. Therefore, the degree of precision control of the wet diaphragm process is also critical. Difficulties 3: High equipment investment cost and long cycle lead to product stagnation The wet process produces battery separator products. Most of the equipment currently required is imported, and domestic equipment manufacturers are few. On March 24, Zhongke Hualian China's wet lithium battery separator equipment manufacturing base was unveiled in Qingdao, but in the face of the situation of “small and porridgeâ€, it was unable to quickly meet the equipment needs of diaphragm companies. In this case, the solution still chose to import. It is understood that if a complete wet-membrane production line is imported from Japan, the procurement cost is over 100 million yuan, and the delivery time is usually more than 10 months. For the production enterprises, this is a long process, which is also caused by China's wet. There are important reasons for the shortage of production of diaphragms. The "barrel" effect is well known, and the disadvantages determine the advantage. It can be seen that the short-board production of medium and high-end wet-membrane production in China is not only one. In the process of its development, the lack of research and development of upstream raw materials, the lack of control ability of the company's own process precision, and the immature production of wet-seated equipment manufacturers As a result, China's high-end wet-process membranes rely heavily on imports. If you want to change this situation, you can only grow or replace the short board one by one.
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