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      Analysis on Key Technology of Electric Vehicles Based on Patent Co-citation

      Liu Yun;Zhou Youfu;An Jing;School of Management and Economics of Beijing Institute of Technology;  
      Electric vehicle is still in the infancy stage of its industrial life cycle,and its relevant technology is not yet mature.There is no consensus expectations for its marketing,also there arc many uncertainties on the development of electric vehicle industry.Blind investment may lead to low innovation efficiency and waste social wealth.In this paper we use the "Derwent Innovation Index" database as data source,apply patent co-citation analysis method,combining with hierarchical clustering and multidimensional scaling analysis to mining the key technologies of electric vehiclesbetweenthe year 1990 and 2007.Studying the core technology of electric vehicle industry can identify the development target of EV industry,can identify research and development goals,andimproveinnovationefficiency.
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