Nickel Hydride Batteries separator process flow and preparation

　　Nickel Hydride Batteries separator process flow and preparation. As the energy density of lithium-ion batteries increases, the requirements for separators are also getting higher and higher. The production process of lithium battery separators is divided into two categories: dry production process and wet production process. With the improvement of technology and technology, dry separators are gradually transitioning to thinner trends.

　　Nickel Hydride Batteries separator process flow

　　At present, dry processes mainly include dry uniaxial stretching and biaxial stretching. The dry single drawing process flow is:

　　1. Feeding: After preprocessing raw materials such as PE or PP and additives according to the formula, they are transported to the extrusion system.

　　2. Casting: The pretreated raw materials are melted and plasticized in the extrusion system and then the melt is extruded from the die. The melt forms a base film with a specific crystal structure after casting.

　　3. Heat treatment: The base film is heat treated to obtain a hard elastic film.

　　4. Stretching: The hard elastic film is cold stretched and hot stretched to form a nano-porous film.

　　5. Cutting: Cut the nano-microporous membrane into finished membranes according to customer specifications.

　　Nickel Hydride Batteries double drawing process flow

　　1. Feeding: Pretreat raw materials such as PP and pore-forming agent according to the formula and then transport them to the extrusion system.

　　2. Tape casting: Obtain PP cast sheets with high β crystal content and good β crystal morphology uniformity.

　　3. Longitudinal stretching: Longitudinal stretching of the cast sheet at a certain temperature, using the characteristics of β crystals that are prone to pore formation under tensile stress to cause pores.

　　4. Transverse stretching: The sample is stretched transversely at a higher temperature to expand the pores and improve the uniformity of pore size distribution.

　　5. Shaping and winding: By heat treating the separator at high temperature, its thermal shrinkage rate is reduced and its dimensional stability is improved.

　　Nickel Hydride Batteries separator preparation method

　　The dry separator process for lithium-ion batteries is the most commonly used method in the separator preparation process. This process is to mix high-molecular polymers, additives and other raw materials to form a uniform melt. During extrusion, a lamellar structure is formed under tensile stress and heat treatment The lamellar structure is used to obtain a hard elastic polymer film, which is then stretched at a certain temperature to form slit-like micropores, and the microporous film is obtained after heat setting. At present, dry processes mainly include dry uniaxial stretching and biaxial stretching.

　　Nickel Hydride Batteries process separators require less fixed asset investment than the wet process due to the simple process; however, it is difficult to control the temperature and other indicators of the dry process, while the wet process is simpler.

　　In the production of general lithium batteries, dry separators have the advantages of low cost, less pollution, and more uniform pores.

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