And short mileage: as technology continues to mature, with lithium-ion batteries as a power source for electric vehicle mileage has increased from less than 100 kilometers to 300 kilometers of the current mainstream, individual vehicle mileage exceeded 400 km. But with the current fuel compared to the mainstream of the auto mileage 500 km there is a certain gap. This problem can be solved by single cell, but the negative issue is volume is too large, increase driving inconveniences.
Second, security can be improved: since the birth of lithium-ion batteries, security issues have plagued consumers. From mobile phones and laptops, to today's electric vehicles, accidents continue to occur. In addition to Nissan and Tesla electric car there was no fire reported, taihe County, China's BYD, United States General and Fisk electric ignition or fire incidents.
Three, slow charging: short relative to the driving range, but lithium batteries more slowly development constraints. At normal speeds, 4-8 hour to electric vehicle power battery fully charged. Now fast-charging lithium-ion batteries, can be filled in 1-2 hours, but its negative influence, life expectancy dropped to 1/3, and the battery performance will decline significantly. Cars do not these problems, refueling more than 5 minutes at a time, stability and security can be guaranteed.
The existence of these three problems, making lithium-ion batteries for overcoming the three shortcomings of the research and development costs increased and expensive products also restricts the development of batteries and battery electric vehicles. So how to solve the short mileage, safety and slow charge and reduce costs without significant price increases in the current research departments and the research directions of the manufacturer.