Electric vehicle battery development

The battery is the primary key to the development of electric vehicles, and the car power battery is difficult to meet the three requirements of "low cost requirements", "high capacity requirements" and "high safety requirements". Nickel-hydrogen batteries store twice as much energy per unit weight as lead-acid batteries, and other performance is better than lead-acid batteries. The price is 4-5 times that of lead-acid batteries, and efforts are being made to bring it down. Iron batteries are rich in resources and cheap iron materials, the cost has been greatly reduced, and there are also manufacturers. Lithium is the lightest, chemical characteristics are very active metal, lithium-ion battery unit weight energy storage is 3 times the lead-acid battery, lithium polymer battery is 4 times, and lithium resources are rich, the price is not very expensive, is a very promising battery. China has achieved rapid development in the industrialization of nickel-metal hydride batteries and lithium-ion batteries. Other related technologies of electric vehicles have made great progress, such as: AC induction motor and its control, rare earth permanent magnet brushless motor and its control, battery and vehicle energy management system, intelligent and fast charging technology, low resistance tires, light weight and low wind resistance body, brake energy recovery, etc. These technological advances make electric vehicles increasingly perfect and practical. The air pollution of China's big cities can not be ignored, and automobile emissions are one of the main sources of pollution. 16 cities in China have been listed among the 20 cities with the most serious air pollution in the world. At present, China's per capita car is an average of 10 cars per 1000 people, and China's car ownership will increase 10 times, and oil imports will become a big problem. Therefore, the research and development of electric vehicles in China is not a temporary short-term measure, but a significant and long-term strategic consideration.