Distributed battery management system (BMS) based on three-layer CAN (controller area network) network and self-powered characteristic

The invention relates to a distributed battery management system (BMS) based on a three-layer CAN (controller area network) network and a self-powered characteristic. The BMS comprises a BMS main control module, a voltage-temperature detection module, a high-voltage management module, an insulation detection module, a current detection module and a group of BMS external interfaces. The BMS is characterized in that a main controller built-in a three-layer CAN communication module embedded in a main controller in the BMS main control module is formed by expansion of the main controller in the main control module by virtue of bus-mastering, and the BMS main control module respectively carries out data communication together with a finished automobile controller, the voltage-temperature detection module and a charger through the three-layer CAN communication module. The BMS provided by the invention has the advantages that a three-layer CAN network structure is adopted, so that the reliability and stability of the BMS are improved, thereby improving the efficiency of the BMS; a voltage-current collection plate self-powered technology is adopted, so that the power consumption of the BMS and the system wiring simplified; and the high-voltage management module adopts a pre-charging method, thus the impact on the vehicle-mounted load and the battery bags is reduced.