Abstract:

With the increase in fire problems of new energy vehicles (EVs), more and more attention has been paid to charging safety. In addition to offering a solution for the vehicle side charging safety protection, this paper provides an overview of charging protection technology from the grid side, charging equipment side, vehicle side, and operating platform side. Secondly, with regards to building a charging early warning protection system architecture, a real-time protection strategy for EV charging is proposed; a battery temperature difference, battery voltage ramp rate, and current ramp rate are proposed; and a double-layer protection model of an active protection layer and a big data protection layer is established based on the real-time monitoring of 27 parameters. Finally, the simulation and verification are carried out based on the BYD Han model by building a physical simulation platform of the early warning system. The State Grid Tianjin Electric Power Company of China demonstrated the system. The results show that the system can realize the charging real-time early warning and deal with it in time when the battery charging is abnormal, which has practical application value for the popularization and development of EVs.