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18650 Ternary lithium battery cell internal structure
The 18650 type battery is one of the most commonly used batteries in consumer digital products. The common form is a cylindrical battery with a diameter of 18mm and a length of 65mm.
The most common lithium battery on the market is the Cylindrical (cylindrical) packaging method, which is the most widely used in the field of notebooks and bright flashlights. ) soft package package, which is common in mobile phones and tablet computers. The most direct benefit of this type of package is that it is light and thin, and it is easy to control the thickness of the product.
The safety valve is the standard configuration of each 18650 cell, and it is also the most important explosion-proof barrier.
The working principle of the safety valve: When the internal temperature of the battery is abnormal and the air pressure rises to 1.0-1.2Mpa, the safety valve opens to remove the internal gas to avoid explosion caused by excessive pressure. The most common phenomenon of "pregnancy" bulging is when the internal pressure of the Prismatic square soft-packed cells increases.
Here is a popular science about the positive electrode inside the cell. Now the common 2000-3000mAh capacity of Samsung, Panasonic, Sanyo, LG and other batteries on the market, the internal cathode material has been upgraded from the first generation LiCoO2 lithium cobalt oxide to a ternary material, the chemical name is LiNi-Co-MnO2 nickel Cobalt Manganese. Immediate benefits: longer life, safer and better performance.
Prismatic's square soft-packed cell phone tablet battery also uses LiNi-Co-MnO2 nickel-cobalt-manganese material, but it is different from the Cylindrical packaging method of 18650.
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