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revolution via clean energy and battery sources. These vehicles are generally produce far less CO2 emissions and constitute low carbon economy.
According to Chen (2009), New energy automobiles include Hybrid vehicle (HV), Battery electric vehicle (BEV) (solar powered auto is included), Fuel cell vehicle (FCV) and other new energies such as efficient energy storage and dimethoxy-ethane. HV most commonly refers to hybrid electric vehicles (HEVs) that uses two or more distinct power sources to move the vehicle. BEV is a type of electric vehicle that purely driven by battery packs. FCV utilize the high efficiency of electrochemical fuel cells to creat power from hydrogen (Yao et al, 2011).
In another work for low-carbon vehicles, Yao et al (2011) categorize NEVs in a more delicate concept that electric vehicles, fuel cell vehicles, hybrid vehicles, biofuels vehicles and other alternative fuel vehicles are all included.
In a word, NEVs are those vehicles that adopt cleaner method to contribute to a sustainable development in the automotive industry.
DEVELOPMENT OF NEV AROUND THE GLOBE
The dramatic drop of fuel consumption and emissions can be expected since the trend of NEV technology has been generally intergraded in recent years (Table 3). Currently, the commercialized products are dominantly HVs (Russell et al, 2011). Leading auto groups such as Honda, Audi, Mercedes-benz, Hyundai and BYD have all launched or will generate several styles of HV.
According to Georgakellos(2008), from a short-term perspective, attention has been drawn on petrol-electric hybrid. From a long-term perspective, focus has been switched to FCV. In addition, battery-powered cars such as nickel/metal hydride battery and lead-acid battery are increasingly step on to a mature stage in the technological term, while plug-in hybrids also see a big business in the next decade (Lewin, 2008) . Currently, parallel hybrid is the main focus in Europe. Without changing traditional mode and by adding motor between gearbox and transmission system, parallel hybrid realize the combination of internal combustion engine and electric drive. The pro of it is the low cost of industrialization while the con is the unideal of fuel consumption.

Technical stages for NEV

Source: Synchronization of various sources by the author
Among several technology roadmaps of NEV, battery has won the technological breakthrough which can be justified through the technology of EC in recent years (Russell et al, 2011; Ella et al, 2012). At the same time, the serious situation of global financial crisis pushes the revolution of automotive power technology to serve as a breach for the economic revival. An unprecedented competition has been developed among the entire car producers and automobile manufacturers around the world. The three major auto giants in North America and the enterprises from Europe, Japan and South Korea have all generated their own new energy strategy for competition to create a new chapter in the history of automotive industry (Table 4).
With the unavoidable climb of oil prices and new problems such as the high usage cost of autos, consumption of NEV will become the trend for the global development of auto industry. Predicts have been made that in the following years, the cost of hybrid system will have a significant drop (Zhang et al, 2011). According to one JP Morgan Chas