lithium battery 18650 3.7v

　　What is the production process of 18650 lithium battery?

　　18650 lithium battery production process 18650 lithium battery is a lithium battery commonly used in electronic products, and is often used as a battery cell in a laptop battery. The definition rule of its model is: such as 18650 type, which means that the diameter of the battery is 18mm, the length is 65mm, and the battery is cylindrical.

　　18650 lithium battery production process

　　The 18650 lithium battery is a lithium-ion battery commonly used in electronic products, and is often used as a battery cell in a laptop battery. The meaning rule of its model is: For example, 18650 type refers to a cylindrical battery with a diameter of 18mm and a length of 65mm.

　　18650 lithium battery production process 1: coating

　　First of all, from the understanding of the coating process, large rolls of copper foil (yellow) and aluminum foil (silver) can be seen in this process. Aluminum foil is used to coat nickel-cobalt-manganese NCM ternary material; on the contrary, copper foil is used to coat graphite as the negative electrode active material; the white one is the diaphragm. The global lithium-ion battery separator is mainly occupied by manufacturers such as Asahi, Celgard, SK, toray, and W-SCOP. These foreign companies control nearly 70% of the market share. The market share of my country's separator companies is about 30%, and the independent localization of lithium-ion battery separators is constantly breaking through. The capacity of the battery cell is obtained according to the proportion area of these formulas.

　　8650 lithium battery production process two: assembly

　　The sorted positive and negative electrodes will be fully automatic packaged here, and the white material is the diaphragm. The 18650 lithium battery can't work normally. It needs to add electrolyte as a medium to let the positive and negative electrodes undergo a chemical reaction, so that lithium ions can migrate between the positive and negative electrodes, and the lithium ion battery can be charged and discharged only when the charged ions output energy. After the automatic roll is wrapped, it rolls directly on the assembly line, and enters the next assembly step to be loaded into the steel shell.

　　The steel shell is stamped and formed in one piece, and the thickness is less than 1mm. Therefore, the requirements for the strength and quality of steel are very high. This 18650 lithium battery factory uses imported Korean steel materials.

　　18650 lithium battery production process three: the first charge and test

　　After the electrolyte is injected into the 18650 lithium battery, it is not actually charged, and the state of the surface of the positive and negative electrodes is not stable at this time. It must be charged for the first time before it can be used normally. This first charge is called formation. When charging for the first time, extra electricity should be charged to form a protective film on the electrode surface. This protective film is the secret of the low self-discharge of lithium-ion batteries. At the same time, the properties of the protective film also affect the performance and life of the battery. Therefore, the chemical formation process is very important. Formation is done using subcontainers.