The round lithium batteryrefers to the cylindrical lithium battery. Because the history of the 18650 cylindrical lithium battery is quite long, the market penetration rate is very high. The cylindrical lithium battery adopts various mature replacement processes, the degree of automation is. Rectangular lithium battery usually refers to an aluminum shell or steel shell rectangular battery. The expansion rate of the rectangular battery is very high in China. It is the rise of automobile power battery in recent years. The difference between vehicle. The key materials used in pouch cell—positive materials, anode materials, and separators—have little difference from traditional steel and aluminum-shell lithium batteries. The.