Dual-battery power management system and method capable of automatically determining battery type and performing charge-discharge protection

A dual-battery power management system capable of automatically determining battery types and performing charging and discharging protection, the dual-battery power management system comprising:

• a first battery module;
• a second battery module;
• a bidirectional power converter electrically connected between the first battery module and the second battery module;
• a voltage detection circuit configured to detect voltages of the first battery module and the second battery module;
• and
• a processing circuit electrically connected to the bidirectional power converter and the voltage detection circuit, wherein the processing circuit is configured to:
• fully discharge the second battery module while charging the first battery module, so as to obtain a battery capacity of the second battery module;
• control the bidirectional power converter to charge the second battery module with the first battery module according to a predetermined battery charging rate related to the battery capacity, and simultaneously control the voltage detection circuit to detect the voltage of the second battery module to obtain a first change rate of a charging voltage;
• obtain a comparison table, which defines corresponding relationships respectively between a plurality of change rate ranges of the charging voltage and a plurality of battery types;
• determine, according to the comparison table and the first change rate, the battery type corresponding to the second battery module;
• and
• control the bidirectional power converter to, according to the battery type of the second battery module, control charging and discharging of the second battery module with a corresponding charging and discharging mechanism.