Analyze the characteristics of cylindrical, square and soft-pack lithium batteries

Cylindrical lithium batteries are divided into lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, cobalt-manganese mixture, ternary materials and different systems. The outer shell is divided into steel shell and polymer. Different material systems have different advantages. At present, it is important to use steel-shell cylindrical lithium iron phosphate batteries. These batteries have the characteristics of large capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, large discharge current, stable electrochemical performance, safe operation, wide operating temperature range, and environmental protection. Widely used in solar lights, lawn lights and lanterns. The typical cylindrical battery structure includes: positive electrode cover, safety valve, ptc element, current cutting mechanism, gasket, positive electrode, negative electrode, isolation membrane, and casing. The earliest cylindrical lithium battery was the 18650 lithium battery invented by Sony Corporation of Japan in 1992. Because the 18650 cylindrical lithium battery has a long history, the market penetration rate is very high, and the cylindrical lithium battery uses a relatively mature winding process. The degree of automation is high, the product quality is stable, and the cost is relatively low. There are many types of cylindrical lithium batteries, such as 14650, 17490, 18650, 21700, 26650 and so on. Cylindrical lithium batteries are very popular among lithium battery companies in Japan and South Korea, and there are also a considerable number of cylindrical lithium battery processing companies in my country. The prismatic lithium battery usually refers to an aluminum or steel shell prismatic battery. Square batteries are very popular in our country. In recent years, with the rise of automobile power lithium-ion batteries, the contradiction between automobile life and battery capacity has become more and more prominent. Most domestic power lithium-ion battery manufacturers use high-energy-density square aluminum batteries, because square batteries have a simple structure and are different from cylindrical batteries. They use high-strength stainless steel as accessories such as enclosures and explosion-proof safety valves. Therefore, the weight of the entire accessory should be light, and the relative energy density should be higher. The square battery uses two different processes: winding method and mixing method. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the differences between the dry and wet forming processes of lithium battery diaphragms?