AG7 battery.What is the production process of 18650 lithium battery?

The production process of 18650 lithium battery. Common 18650 lithium batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium-ion battery is 3.7v and the charging cut-off voltage is 4.2v. The nominal voltage of lithium iron phosphate battery is 3.2V and the charging cut-off voltage is 3.6v.

The production process of 18650 lithium battery. Common 18650 lithium-ion batteries are divided into lithium-ion batteries and lithium iron phosphate batteries. The nominal voltage of lithium-ion battery is 3.7v, the charging cut-off voltage is 4.2v, the nominal voltage of lithium iron phosphate battery is 3.2V, the charging cut-off voltage is 3.6v, the capacity is usually 1200mAh-3350mAh, the common capacity is 2200mAh- 2600mAh.

18650 lithium battery production process

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

Production process of 18650 lithium battery cell one: coating

First, let’s start with 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; conversely, copper foil is used to coat negative active material graphite; the white one is the separator. Global lithium-ion battery separators are mainly occupied by Asahi, Celgard, SK, Toray, W-SCOP and other manufacturers. These foreign companies control nearly 70% of the market share. Our country's separator companies account for about 30% of the market share, and the independent localization of lithium-ion battery separators is making breakthroughs. The capacity of the battery core is obtained based on the proportional area of these formulas.

A full roll of coated positive and negative electrode materials is about 126mm wide, and is then cut into 7 small rolls with a width of about 18mm. Each roll will be evenly divided into several sections, each section representing the materials required for a battery core. According to Xugong, 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 output of battery cells is 500,000, and 10 tons are used The cost of ternary cathode materials alone costs 600,000 yuan per day.

The automated machine will mark each section with nickel tape and insulating and high-temperature-resistant Mylar. The next step is to weigh it in five levels, namely heavy, A1, A2, A3, and light. This is the same as CPU wafer selection. The same batch of cutting processes will also have different physical properties. According to different physical properties, the corresponding capacities will be divided and shipped in pairs.

18650 lithium battery production process two: assembly

The sorted positive and negative electrodes will be fully automatically rolled and packed here. The white material is the separator. The 18650 lithium battery cell cannot work properly like this. Electrolyte must be added as a medium to allow a chemical reaction between the positive and negative electrodes, 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 charge ions output energy. After the automatic roll is wrapped, it rolls directly onto the assembly line and enters the next assembly step to install the steel shell.