Battery Management Circuit, Device to be Charged, and Power Management Method

A device to be charged, comprising:

• a battery, comprising a first cell and a second cell coupled in series;
• and
• a battery management circuit, comprising a first charging channel, a Cuk circuit, and a communication control circuit, wherein
• the first charging channel, through which at least one of charging voltage and charging current is received from a power supply device and applied directly to the battery for charging;
• the communication control circuit is configured to communicate with the power supply device to make magnitude of at least one of the charging voltage and the charging current from the power supply device match a present charging stage of the battery, when the power supply device charges the battery through the first charging channel;
• and
• the communication control circuit is further configured to send a drive signal to the Cuk circuit to drive the Cuk circuit to work, to make energy of the first cell and the second cell be transferred through the Cuk circuit to balance voltage of the first cell and voltage of the second cell, when the voltage of the first cell and the voltage of second cell are unbalanced.