1.5v Alkaline 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: For example, type 18650 means that the diameter of the battery is 18mm and the length is 65mm.

18650 lithium battery production process

The 18650 lithium battery is a commonly used lithium battery in electronic products and is often used as a battery core in laptop batteries. The definition rules of its model are: 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 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. The market share of Chinese separator companies is about 30%, and the independent localization of lithium 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. It is necessary to add electrolyte 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 generate charge ions to output energy before the lithium battery can be charged and discharged. 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, additional electricity needs to be charged to create 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.

How to judge the quality of 18650 lithium battery?

1. Use a multimeter to test the DC range at a range greater than the rated voltage of the battery. For example: test 9V and 1.5V dry batteries in DC10V and DC2V ranges.

2. After selecting the gear according to the rated voltage of the lithium battery, use test leads to connect the positive and negative poles of the battery respectively. When the test voltage is greater than or equal to the rated voltage marked on the battery. The battery is intact. When the test voltage is 10% lower than the rated voltage, the battery can be used on electrical appliances with small discharge depth.

3. Please be reminded that the voltage of rechargeable batteries is generally 15%-25% lower than similar batteries. For example, the voltage of 5# battery is 1.5V, while rechargeable batteries are generally only 1.2-1.3V. Therefore, the rated value marked on the battery should be carefully confirmed.