CR2032 battery

　　What is the production process of CR2032 battery separators? What are the process flows of CR2032 battery separators?

　　Lithium iron battery separator production process

　　The production process of lithium iron battery separators is mainly divided into dry stretching and wet stretching. The many characteristics that CR2032 battery separators need to possess put forward special requirements for its production process, which includes raw material formula and rapid formula adjustment, micropore preparation technology, and independent design of complete sets of equipment.

　　The dry uniaxial stretching process is a method of producing hard elastic fibers to prepare highly oriented polypropylene or polyethylene films with low crystallinity. During the high-temperature annealing process, a film with high crystallinity is obtained. This film is first stretched at low temperatures to form micro-defects, and then at high temperatures the defects are pulled apart to form micropores. At present, more than one-third of China's production capacity uses the dry double drawing process, and its products occupy a large proportion of the mid- to low-end market.

　　Wet production process, also known as phase separation method or thermal phase separation method, wet process mixes liquid hydrocarbons or some small molecular substances with polyolefin resin. After heating and melting, a uniform mixture is formed, and then the temperature is cooled for phase separation and pressing. The membrane is obtained, and then the membrane is heated to a temperature close to the melting point, biaxially stretched to orient the molecular chains, and finally kept warm for a certain period of time. The residual solvent is eluted with volatile substances to prepare interconnected microporous membrane materials.

　　CR2032 battery separator dry single drawing process flow

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

　　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.

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

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

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

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