Research On Dynamic Mechanism And Critical Path Of Scientific Knowledge Evolution Of New Energy Vehicles

The development of new energy automotive industry is an important opportunity for China to achieve corner overtaking in the automobile industry in the world.During “12th Five-Year” period,China's new energy automotive industry has basically achieved the initial stage of the task and will push into the rapid development stage.To achieve the target,we should enlarge the strength of basic research to achieve technological innovation and core technology breakthroughs.This paper uses the literature data to mining common scientific problem and the development path of the knowledge basic to understand the development of basic research of new energy vehicles clearly.Also we will analyzed the dynamic mechanism of knowledge base on the research of new energy vehicles to evaluate the leading and promoting role of various knowledge domains in the new energy vehicles.This study will provide support for China's efficient allocation,rational development of scientific and technological resources and making scientific and technology policy.This study uses the literature data from the Web of Science core collection.Firstly,we select the first 20 research direction according the number of literatures as knowledge domain and build the citation matrix between the each research direction.Than we use the input-output analysis method to calculate the influence coefficient and the induction force coefficient.The result show the research direction of energy fuel,electrochemistry and chemistry has the important guiding and promoting effects on the research of new energy vehicles.Than we extract the key words from the data and eliminate noise to build a new energy automotive research dictionary.Through statistics of each subject word frequency and making a list of 58 words,we can see that the basic research topic of new energy vehicles including energy management,control system,battery system,charging and discharging system,driving system,smart grid,braking system and some other topics.Than we statistic the keywords to find the attention in each time period,the result show lithium batteries,lead-acid battery,electrode material,charging and discharging system,super capacitor,motor drive,fuel cell,alternative fuel and control system have received high attention.After 2006 year,the smart grid,thermal management,Lithium iron phosphate,power distribution system,winding and other research began to be widespread concern.Lastly,we use the CitNetExplorer software to build a direct citation network on new energy vehicles.There are 5 clustering after adjust the threshold including smart grid research,vehicle control research,battery research,drive control system and wireless charging system.