Lithium-ion battery has the characteristics of light weight, large energy storage, high power, pollution-free and so on. it has been widely used in various fields. its research and production have made great progress. Lithium ion battery as a power source in electric vehicles has become a new trend in the development of electric vehicles.

　　The progressiveness of lithium-ion battery technology and its application in emerging key markets (electric vehicles) have stimulated a global R&D boom, so lithium-ion batteries will certainly occupy an important position in the field of electric vehicles and new energy. At present, the lithium ion battery that is widely used in electric vehicles is lithium iron phosphate battery, which has good thermal stability and safety, and is relatively cheap. These factors make lithium iron phosphate battery the first choice for small electric vehicles and PHEV power batteries. However, among lithium ion batteries, the specific energy, specific power and operating voltage of lithium phosphate battery are relatively low, so lithium cobalate and lithium manganate batteries have more advantages in the application of large pure electric vehicles.

　　However, there are also some problems in the wide application of lithium battery electric vehicles, mainly due to the performance limitations of lithium batteries, including the safety, cycle life, cost, working temperature and material supply of lithium ion batteries

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