Analysis of cell structure of 18650 lithium battery

18650 batteries are one of the most commonly used batteries in mobile power supplies and laptop batteries. The common form is a cylindrical cell with a diameter of 18mm and a length of 65mm. The most common lithium battery on the market is a cylindrical (cylindrical) package, which is a very widely used battery cell in the field of notebook computers and bright flashlights. The advantage of this kind of packaging is that the specifications are uniform, which is convenient for automation and large-scale processing. In addition, prismatic (square) flexible packaging is common in mobile phones and tablets. The advantage of this kind of packaging is that it is lighter and thinner, which makes it easy to control the thickness of the product. The safety valve is the standard configuration of each 18650 cell, and it is also a more 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, so as to avoid explosion due to excessive pressure. Same as the prismatic square flexible packaging battery cell, when the internal pressure is increased, the pregnancy bulge is very common. Here, popular science is the positive electrode inside the battery cell. At present, Samsung, Panasonic, Sanyo, LG and other commonly used batteries with a capacity of 2000-3000mAh, the internal cathode material has been fully upgraded from the first generation of LiCoO2 lithium cobalt oxide to a ternary material, and the chemical name is LiNi-Co-MnO2 nickel cobalt manganese. The advantages of straightness are: longer service life, safer, and better performance. Speaking of this, the prismatic square soft package mobile phone tablet battery is also made of LiNi-Co-MnO2 nickel cobalt manganese material, but it is different from the 18650 cylindrical package. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete it.