Fecha de publicación: 13/11/2018 Fuente: Wipo "IOT" The invention provides a direct-current charging system based on an NB-IOT technique. The direct-current charging system mainly comprises a microprocessor, a communication unit and a power supply module, wherein the communication unit comprises a CAN communication module and an NB-IOT module; the CAN communication module is used for collecting information of a charging module and a vehicle-mountedbattery management system and conveying the information to the microprocessor, the microprocessor is used for sending the information of the charging module and the vehicle-mounted battery managementsystem to an NB-IOT base station by virtue of the NB-IOT module, the NB-IOT base station is used for collecting the information collected by the NB-IOT module and sending the information to a supervision service platform through an NB-IOT core network for communication, and the supervision service platform can be used for supervising the information including voltage, current, power factor, temperature and the like of the charging system in real time. According to the direct-current charging system, a user can pay through swiping cards and downloading special APP and can pay through WeChat and Alipay. The NB-IOT technique adopted in the system is low in effect and transmission cost and large in coverage range, and NB-IOT equipment is long in standby time, and the system has complete functions and stable performance and can be conveniently used by the user.