Abstract
Based on the patent data collected from European patent database search, this paper firstly analyzes the general situation of electric vehicle battery field in terms of patent application trend, regional distribution and technology field distribution, then constructs patent citation networks in different development stages and identifies the main path of patent citations by SPC algorithm. Finally, the technological evolution process in the field of electric vehicle battery is analyzed by combining visualization mapping and patent texts. The research results show that the evolution direction of electric vehicle battery technology gradually converges, and fuel cell technology is the most critical technology in the whole technology development process.
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