POWER SUPPLY APPARATUS, BATTERY MANAGEMENT SYSTEM, POWER SUPPLY SYSTEM, CONTROL METHOD AND MEDIUM

The embodiments of the present application provide a power supply apparatus (50), a battery management system (54), a power supply system, a control method and a medium. The method includes: controlling, under a condition that a vehicle is in a parking state, a first battery pack (51) of a power supply apparatus (50) to supply power to a first load (71) of the vehicle, and controlling the first battery pack (51) and a second battery pack (52) of the power supply apparatus (50) to stop supplying power to a second load (72) of the vehicle; acquiring, in a process of supplying power to the first load (71), a capacity parameter of the first battery pack (51); controlling, under a condition that the capacity parameter of the first battery pack (51) is lower than a first preset capacity threshold, a direct current converter (53) to transmit electric energy of the second battery pack (52) to the first battery pack (51). The embodiments of the present application may make the power supply strategy more flexible.