Battery state detection method

The invention provides a battery state detection method based on a system. The system comprises a host machine, an SMBUS control core and a battery state chip, wherein the SMBUS control core is in charge of interaction of the host machine and the battery state chip; the host machine only interacts with the battery state chip once; the interaction state is controlled by virtue of the SMBUS control core; a read operation and a write operation are realized in the SMBUS control core; handshaking of each operation step is executed in a state machine of the SMBUS control core; the SMBUS control core comprises seven registers which are respectively a PRERLo clock low-order register, a PRERHi clock high-order register, a CTR control register, a TXR transmission register, an RXR receiving register, a CR (Command Register) and an SR (State Register). The battery state detection method is capable of improving the transmission speed as much as possible so as to eliminate idling of a time slice of the host machine.