In recent years, due to the characteristics of simplicity, convenience and safety, wireless power transfer (WPT) technology obtains rapid development and application in electric vehicle and electronic equipment. This article reviews in details the research progress on reducing the energy loss of coupled coils in electric vehicles at home and abroad. Meanwhile, a specific analysis is made from the aspects of coil material, coil structure and coupling coils alignment about recent researcher's works. In addition, the future research prospects for reducing the coupling coil energy are introduced. Furthermore, a comprehensive optimization model for reducing the energy loss of coupled coils is also proposed.
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