What are the differences in the characteristics of the two mainstream electric vehicle power lithium batteries

The biggest difference between electric cars and traditional cars is the fuel used. Traditional cars basically use gasoline or diesel to supply power to make the engine drive the vehicle. In electric cars, the battery supplies electric energy to the motor to drive the vehicle. In this process, the electric vehicle It has zero exhaust emissions, and the engine of a traditional car emits carbon monoxide, nitrogen oxides, hydrocarbons, and particulates, which are harmful to the environment and people's health. The cruising range of electric vehicle batteries is a problem that everyone cares about. After all, charging is not as fast as refueling. If the cruising range is too short, it is really a maddening thing to charge multiple times a day. In order to cope with the cruising range problem, auto manufacturers are constantly adding the cruising range of vehicles. Now the cruising range of many vehicles can reach about 500 kilometers, which is very close to the cruising range of a tank of fuel. To increase the cruising range, you must choose the right battery. At present, there are two mainstream electric vehicle batteries: ternary lithium-ion batteries and lithium iron phosphate batteries. The standard operating voltage of ternary lithium-ion batteries is 3.6-3.8V. In between, the standard working voltage of lithium iron phosphate batteries is around 3.2V, and these two batteries have reached about 98% of the total installed vehicles in China. When the weight of the battery is equal, the endurance of the car is mainly determined by the energy density of the battery. The energy density of the current mainstream battery is 140-160wh/kg for ternary lithium ion batteries and 100-160wh/kg for lithium iron phosphate batteries. About 125wh/kg, of course, this is not the highest density at this stage, but the density of some batteries that have been installed in vehicles. In addition to the difference in battery energy density, the bigger problem lies in safety. Both batteries involve the decomposition of the positive electrode material during use. The decomposition temperature of the ternary lithium ion battery is 200 degrees, and the lithium iron phosphate battery The decomposition temperature is 700 degrees, so cars using ternary lithium-ion batteries are prone to spontaneous combustion if the battery's thermal management system is not handled well. This kind of example has occurred in many cases. In addition, the two types of batteries have different working tolerances at low temperatures. The ternary lithium-ion battery can release 70% at minus 20 degrees, while the lithium iron phosphate battery can only release 54%, so in the northern winter The cruising range of electric vehicles equipped with lithium iron phosphate batteries has dropped extremely quickly. Now some electric vehicles have been equipped with battery temperature control systems that can keep the battery in the most suitable operating temperature range. 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: Do you know which ternary lithium ion battery is?