3.7v 18650 lithium battery

　　Do you know the difference between the dry production process and the wet production process of 3.7v 18650 lithium battery separators?

　　Comparison of dry and wet production processes for 3.7v 18650 lithium battery separators

　　1. Dry production process of 3.7v 18650 lithium battery separator

　　The dry method of 3.7v 18650 lithium battery separator can be subdivided into uniaxial stretching process and biaxial stretching process. 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.

　　2. Wet production process

　　Also known as phase separation method or thermally induced phase separation method, the 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 lowered for phase separation, and the film is obtained by pressing. The membrane is heated to a temperature close to the melting point, stretched in two directions 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 an interconnected microporous membrane material.

　　The difference between wet production process and dry production process of lithium battery separator

　　The advantages of the dry uniaxial stretching process are that the process is relatively simple, the added value is high, and there is no environmental pollution. However, low-temperature stretching can easily cause perforation of the separator, and the product cannot be made very thin.

　　The wet process produces small and uniform micropores but is not environmentally friendly. The wet process molding process is easy to control, and the produced separator has high biaxial tensile strength and high puncture strength. Normal process flow will not cause perforation, and the micropore size is relatively small and evenly distributed. This product can be made very thin, has better mechanical properties and product uniformity, and is suitable for high-capacity batteries. It is mainly used in high-end mobile phones, notebook computers, 3C electronic products and other fields.

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