The invention puts forward an extensible hybrid battery management system, which comprises a main processing unit and extensible subunits, wherein the main processing unit and the extensible subunits as well as adjacent extensible subunits are connected through a daisy chain communication way; the extensible subunits collect the voltage and the temperature of a current battery cell module, executes a balance function and a fault diagnosis function and transmits battery cell module information which is currently managed to the main processing unit through the daisy chain communication way; the main processing unit operates a preset system strategy and communicates with external equipment according to the voltage, the current, the temperature and the system fault information of all battery cell modules. The extensible hybrid battery management system provided by the invention monitors and manages the voltage, the current, the temperature and the system fault information of the battery cell modules to guarantee that the battery cell modules normally work, and the extensible hybrid battery management system has the advantages of high expandability, maintainability and reliability.