Power battery full-balance controller for electric automobile

The utility model discloses a power battery full-balance controller for an electric automobile. The external voltage acquisition circuit of a MCU (Microprogrammed Control Unit) is used for detecting power battery monomer voltage to obtain the maximum and minimum monomer voltage of the power battery monomer voltage. The CAN communication module of the MCU is converted through a transceiver level and then is connected with a battery management system to obtain the remaining battery capacity information and battery balance threshold of BMS. If the difference value is larger than the set battery balance threshold, enter into a full-balance control method. When the remaining battery capacity is smaller than or equal to 30%, the external active balance control circuit of the MCU charges the lowest battery monomer. When the remaining battery capacity is larger than or equal to 70%, the MCU utilizes the gating MOS (Metal Oxide Semiconductor) switches of the external passive balance control circuits of GPIO (General Purpose Input/Output) modules C and D to discharge the highest battery monomer. When the remaining battery capacity is between 30%-70%, the MCU simultaneously opens the active and passive balance circuits to adopt a mixed balance control method. According to the condition of remaining battery capacity of the battery, the power battery full-balance controller automatically switches the balance mode. On the base that too much hardware cost is increased, the power battery full-balance controller completes the operation for consistency of the power battery and also reduces the power consumption.