AG3 battery.What is the production process of 18650 lithium battery?

The production process of 18650 lithium battery. The 18650 lithium battery is a commonly used lithium battery in electronic products. It is often used as a battery in laptop batteries. 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

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.

8650 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.

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

18650 lithium battery production process three: first charging and testing

After the 18650 lithium battery is injected with electrolyte, it has not actually been charged, and the state of the positive and negative electrode surfaces has not reached stability 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 is charged to form a protective film on the surface of the electrode. This protective film is the secret of the low self-discharge of lithium-ion batteries. At the same time, the nature of the protective film also affects the performance and life of the battery. Therefore, the chemical formation process is very important. The formation is completed using volume dividing cabinets.