2200mah 18650 battery

Introduction to the differences and characteristics of wet-process and dry-process 2200mah 18650 battery diaphragms

Differences between dry-process and wet-process lithium-ion battery diaphragms

Comparison of the differences between wet-process and dry-process lithium-ion battery diaphragms. Diaphragms are the core of lithium-ion battery preparation. Lithium-ion battery diaphragms are generally divided into dry-process and wet-process according to the process. Therefore, diaphragm products are also divided into dry-process diaphragms and wet-process diaphragms. The many characteristics that lithium-ion battery diaphragms must have put forward special requirements for their production process, and the production process includes raw material formula and rapid formula adjustment, micropore preparation technology, and complete equipment independent design and other processes.

a. The dry method has a simple process and smaller fixed asset investment than the wet method; however, the temperature and other indicators of the dry method are difficult to control, and the wet method has a simpler process;

b. The dry method can make a three-layer membrane, while the wet method can only make a single-layer membrane; (The advantage of the three-layer membrane is that the thermal shutdown temperature is 135 degrees, but the thermal stability temperature is 160 degrees, which can prevent thermal inertia and has a 25-degree space, which is safer)

c. In addition to the different processing technologies, the dry method and the wet method also use different raw materials. The raw materials used in the dry method are fluid and low in molecular weight, so the high temperature can only reach 135 degrees, and they will shrink when heated, and their safety is not suitable for making high-power and high-capacity batteries; the wet method uses non-flowing and high-molecular-weight raw materials, and the thermal shutdown temperature can reach 180 degrees, which can ensure the safety of high-power lithium-ion batteries;

d. In the production of general lithium-ion batteries, the dry method has advantages, such as low cost, low pollution, and more uniform pores; the wet method has advantages in high-power batteries, and the important thing is safety and low thermal shrinkage.

Advantages of wet-process diaphragms and dry-process diaphragms for lithium-ion batteries

Wet-process diaphragms for lithium-ion batteries are thin and not easy to tear, but the melting point of PE is 135°C, and the safety is lower than that of dry-process diaphragms. In addition, the raw materials and production processes are different, and the comprehensive cost is higher than that of dry-process diaphragms; dry-process diaphragm products have a high melting point, better heat resistance, high pressure resistance and oxidation resistance, but are thicker than wet-process diaphragms, and are easy to tear longitudinally, which has higher process requirements for battery companies.

The diaphragm is the link with the highest technical barriers in lithium-ion battery materials, and its performance is crucial to the lightweight and safety of lithium-ion batteries. Wet-process diaphragms have certain advantages over dry-process diaphragms in 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-process coated diaphragms have obvious performance advantages. Most high-end consumer batteries use wet-process diaphragms. With the increase in energy density requirements for power lithium batteries, especially the widespread application of ternary batteries, the penetration rate of wet-process diaphragms in power lithium batteries will also gradually increase.

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