What are the differences between wet and dry separators for lithium batteries?

Comparison of the difference between wet method and dry method of lithium battery a. Because the process is simple, the investment in fixed assets is smaller than that of the wet method; however, it is difficult to control the temperature and other indicators of the dry method in the production process, and the wet method is simpler; b. The three-layer film can be made by the method, and the wet method can only be used as a single-layer film; (The advantage of the three-layer film is that the thermal shutdown temperature is 135 degrees, but the thermal stability temperature is 160 degrees, which can prevent thermal inertia. There is a space of 25 degrees. Safety) c. In addition to different production processes, dry and wet methods use different raw materials. The raw materials used in the dry method have good fluidity and low molecular weight, so the high temperature can only reach 135 degrees, and it will shrink when heated, and the safety is not suitable for high-power and high-capacity batteries; the wet method uses non-flowing, high-molecular-weight raw materials. The thermal shutdown temperature can reach 180 degrees, which can ensure the safety of high-power lithium batteries; d. In terms of processing general lithium batteries, dry methods have advantages, such as low cost, less pollution, and more uniform holes; high-power batteries have wet methods The main advantages are safety and low heat shrinkability. Advantages of lithium battery wet-process separator and dry-process separator The lithium battery wet-process separator is thin and not easy to tear, but the PE melting point is 135℃, which is less safe than dry-process separators. In addition, the raw materials and processing procedures are different, and the overall cost is higher than that of dry-process separators. Diaphragm: Dry-process diaphragm products have high melting point, better heat resistance, high pressure resistance and oxidation resistance, but related to wet-process diaphragms are thicker and easy to tear longitudinally, which requires higher process requirements for battery companies. Diaphragm is the link with the highest technical barrier among lithium battery materials, and its performance is very important to the lightweight and safety of lithium batteries. Compared with dry-process diaphragms, wet-process diaphragms have certain advantages in terms of mechanical properties, air permeability, and physical and chemical properties. After coating, the thermal stability of wet-process diaphragms can be greatly improved. In general, wet-coated diaphragms have obvious performance advantages. Most high-end consumer batteries use wet-process separators. With the increase in energy density requirements of power lithium-ion batteries, especially the wide application of ternary batteries, the penetration rate of wet-process separators in power lithium-ion batteries will gradually increase. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it. Previous: How to deal with the scrapped UPS lithium battery?