A hierarchical battery-management system mainly comprises a monitoring and equalizing module, an intermediary module, and a decision and communication module. The monitoring and equalizing module electrically couples with the battery cells, the intermediary modules electrically couple with the monitoring and equalizing module and the decision and communication module. The decision and communication module electrically couples with a power system or an electronic/electrical apparatus, and a hierarchical management structure constructed by the intermediary module to screen data and to transmit meaningful cell data to meet real time managing requirements of the large battery set.