Research on Electric Vehicle Charging Communication Protocol Framework and the Application in ChaoJi Charging System

This paper compares the characteristics of the mainstream international electric vehicle charging communication protocols and proposes a new communication protocol framework, specifying the function modules that make up the charging process and the mandatory/optional, fixed/reloadable attributes of the function modules. The communication protocol based on the framework can realize personalized charging services through flexible configuration of the function modules and specific instances according to application requirements. This framework meets the requirements of compatibility, scalability, and flexibility of charging communication protocols. The charging communication protocol designed based on this framework has been adopted by the Chinese national standard GB/T27930 which is being upgraded, and has been applied in the new direct current charging system ChaoJi. In addition to basic charging, some new functions are being developed to validate its scalability and flexibility.