Why do electric vehicles use lithium batteries as energy sources?

Why do electric vehicles use lithium batteries as energy sources? Electric vehicle batteries are the power source for electric vehicles. Most electric vehicles are equipped with lead-acid batteries. Lead-acid batteries are cost-effective and cost-effective. Lithium batteries have the characteristics of light weight, high energy storage, high power, and no pollution, and are widely used in various fields. Its research and processing have made great progress. As the power source of electric vehicles, lithium batteries have become a new trend in the development of electric vehicles. There are diversified brands of lithium battery electric vehicles, including Yadi, Giant, Emma and other lithium electric vehicles. Charging for 6 to 8 hours, depending on the battery capacity, it can run 30 to 145 kilometers, and the weight is only about 1/5 of the lead-acid battery. The biggest advantage of the lithium battery is the long life of the electric bicycle. It is only on the surface that the price of lithium batteries is expensive. In fact, the cost is similar to that of lead-acid batteries. At present, lithium batteries are guaranteed for 2 years, while lead-acid batteries are guaranteed for 1 year. Therefore, the quality of cheap goods will naturally be compromised. Lithium batteries are generally used for 3 to 5 years without problems. Lithium batteries are widely used in electric vehicles. They are lithium iron phosphate batteries, which have good thermal stability and safety, and are relatively inexpensive. These factors make lithium iron phosphate batteries the first choice for small electric vehicles and plug-in hybrid lithium-ion batteries. In electric vehicles, the three-electric system is the core, and the battery is the core of the core. As the power source of power energy and the vehicle, it plays a very important purpose. At present, the mainstream battery for electric vehicles is lithium battery, with moderate energy density, relatively mature, and relatively advantageous manufacturing cost. However, lithium batteries also have very fatal weaknesses, such as poor safety and easy to cause fire; for example, charging is very slow, and it takes several hours at the earliest. Advantages of using lithium batteries in electric vehicles 1. The lithium battery is not activated and the lithium battery sleeps for a period of time, when its capacity is lower than the normal level. However, lithium batteries are easily activated, and the battery can be activated and restored to normal capacity after only three to five normal charge and discharge cycles. Due to the characteristics of lithium batteries, it has almost no memory effect. Therefore, the user is not a special method and equipment in the process of activating the new lithium battery. So you don’t have to worry about it breaking. No pressure storage for 3 years. 2. Lithium batteries have no memory effect. Consumers are always worried about the memory effect of the battery when using lead-acid batteries and nickel batteries. If lithium batteries are used, we can relax. Lithium batteries have no memory effect. The battery capacity will not increase suddenly, nor will it change much. 3. The lithium battery electrolyte with high internal impedance is an organic solvent, and its conductivity is much lower than the aqueous electrolyte of nickel-cadmium batteries and nickel-hydrogen batteries. Therefore, the internal impedance of lithium batteries is approximately 11 times that of nickel-cadmium batteries and nickel-hydrogen batteries. For example, the impedance of a single battery with a length of 18 mm and a diameter of 50 mm is about 90. 4. The operating voltage of a lithium battery changes greatly. For example, when the battery is discharged to 80% of the rated capacity, the voltage change of a nickel-cadmium battery is small (about 20%) , And the voltage change of lithium battery is relatively large (about 40%). This is a serious flaw for battery-powered devices, but lithium batteries are easy to test the remaining power because the discharge voltage varies greatly. The advantages of lithium-iron batteries for electric vehicles have high energy density: nominal voltage is 3.2v, energy density is about 4 times that of lead-acid batteries, small in size and light in weight. Strong safety: Lithium iron phosphate battery cathode material has good electrochemical performance, the charging and discharging platform is very stable, the structure is stable during the charging and discharging process, the battery does not burn, does not explode, and the safety is good; high temperature performance: the battery is at the outside temperature It works normally at 55℃; high power output: standard discharge 0.2c, can be charged and discharged at 3C; long cycle life: 1C charge and discharge at room temperature, the monomer capacity is still greater than 80% after 2000 cycles; environmental protection: the lithium battery processing process is clean Non-toxic, all raw materials are non-toxic. 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. Previous: Development direction of lithium battery cathode materials