lithium ion battery cells 18650

　　18650 lithium battery production process

　　The 18650 type lithium battery is a lithium battery commonly used in electronic products, and is often used as a battery cell in a notebook computer battery. The definition 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, let's understand the coating process. In this process, you can see large rolls of copper foil (yellow) and aluminum foil (silver). 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 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 Chinese diaphragm companies is about 30%, and the independent localization of lithium battery diaphragms is constantly breaking through. The capacity of the battery cell is obtained according to the proportion area of these formulas.

　　A whole roll of coated positive and negative electrode materials is about 126mm wide, and then needs to be cut into 7 small rolls with a width of about 18mm. Each roll will be evenly divided into several sections, and each section represents the material required for a battery cell. According to Xu Gong, an engineer at the battery cell factory, the current price of ternary cathode materials is 120,000 yuan per ton, and each ton of material can be used to produce 50,000 batteries; the current average daily production capacity of batteries is 500,000 pieces, and 10 tons are needed For ternary cathode materials, this expenditure alone requires 600,000 yuan per day.

　　The automated machine stamps each segment with a nickel strip and insulating and high-temperature-resistant Mylar sheet (Mylar). The next step is to carry out 5 levels of weighing, which are heavy, A1, A2, A3, and light. This is the same as the selection of CPU wafers. The same batch of cutting processes will also have different physiques. According to different physiques, the corresponding capacities will be divided and shipped in pairs.