POWER BATTERY CHARGING METHOD, CHARGING APPARATUS, AND CHARGING SYSTEM

Embodiments of this application provide a charging method and charging apparatus for traction battery, which can improve performance of charging apparatuses. The charging method is applied to a charging apparatus. The charging apparatus includes N energy storage units connected in series, where each energy storage unit includes an energy storage battery and a first DC/DC converter connected to the energy storage battery, and each charging period of the charging apparatus includes a stage in which a traction battery is charged and a stage in which the traction battery discharges to the N energy storage units. The charging method includes: in the discharge stage, obtaining a current voltage of the energy storage battery in each energy storage unit; determining, based on the current voltage of the energy storage battery in each energy storage unit, a first voltage output by the first DC/DC converter in each energy storage unit, where the first voltage output is inversely proportional to the current voltage of the energy storage battery; and sending the first voltage to the first DC/DC converter, so as to cause the energy storage battery to receive, at the first voltage via the first DC/DC converter, electrical energy released by the traction battery.