Analyze the car’s introductory knowledge—lithium battery

Automobile analysis-lithium battery Lithium battery is currently one of the most commonly used battery types in electric vehicles. Although it has not been long since its inception in 1970, it quickly occupied most of the electric vehicle battery market due to its high energy density and long cycle life. Nowadays, there are lithium iron phosphate batteries and ternary lithium batteries in the sales of electric vehicle equipment, and these two batteries have obvious differences in their respective characteristics, so we have to make detailed explanations and comparisons. Why are lithium iron phosphate batteries safe? Most people may not know electric vehicle batteries, so let us give an example to help us understand. Recently, the new electric car brand denza co-founded by BYD and Daimler will go on sale. Compared with the previous lithium manganese battery, the energy density of the lithium iron phosphate battery is not much different, about 100-110wh/kg, but its thermal stability is the best in the car lithium battery now, when the battery temperature is 500 -600℃ high temperature, its internal chemical composition is decomposed, which belongs to the unstable state of the internal chemical composition of lithium cobalt oxide battery at 180-250℃. In other words, the safety of lithium iron phosphate batteries is second to none in lithium batteries, which is why it is now one of the important categories of electric vehicle batteries. Why did Tesla choose the ternary lithium battery? Compared with the lithium iron phosphate battery, the ternary lithium battery used in Tesla MODELS has a higher weight and energy density (about 200Wh/kg), which means the same weight Ternary lithium batteries have a longer range than lithium iron phosphate batteries. But its shortcomings are obvious. When the temperature is 250-350°C, the internal chemical substances begin to decompose, so high requirements are put forward. Each part of the battery processing system needs to add a safety separation device to the battery. In addition, due to the small size of the monomer, so The number of bicycle battery cells is huge. For models, for example, more than 7000 18650 ternary lithium batteries are installed in a car, which further increases the control difficulty of the battery processing system. Therefore, Tesla is the only car on the market that uses ternary lithium batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Three technologies to improve the voltage performance of lithium battery cathode materials