Battery management method and system for lithium-ion battery

The invention discloses a battery management method and system for a lithium-ion battery. The method comprises the steps as follows: the lithium-ion battery transmits an SMBUS clock signal and an SMBUS data signal to the battery management system of a notebook computer and sends a handshake request; the battery management system of the notebook computer identifies the lithium-ion battery according to the clock signal and the data signal transmitted by the lithium-ion battery and builds communication with the lithium-ion battery; the lithium-ion battery transmits battery state parameters to the battery management system of the notebook computer; the battery management system of the notebook computer judges the lithium-ion battery state parameters for function judgment; and the lithium-ion battery is charged or discharged according to a judgment instruction of the battery management system. By the battery management method and system, the service lifetime of the lithium-ion battery of the notebook computer is e