A power supply apparatus, comprising: a battery electric cell, a switch device, a voltage boost circuit, a state detection circuit, and a logic control circuit, wherein the switch device is connected in a current path of the battery electric cell; the voltage boost circuit is connected in parallel to the current path, and is configured to boost an output voltage of the battery electric cell; the state detection circuit is configured to detect a state of the battery electric cell and a state of the apparatus, and generate a state signal, wherein the state signal is used to indicate the state of the battery electric cell and the state of the apparatus; and the logic control circuit is configured to receive the state signal from the state detection circuit, and control the switch device and the voltage boost circuit according to the state signal, and when the battery electric cell is in an abnormal charging state in which charging current is greater than an allowed maximum charging current, control the switch device to turn off the current path, and when the voltage boost circuit is not required to work, turn off the voltage boost circuit and control the switch device to turn on the current path; wherein the apparatus further comprises an isolation charging circuit, connected in parallel to the current path and the voltage boost circuit, and configured to charge the battery electric cell and isolate the output voltage of the battery electric cell from the output voltage of the apparatus, wherein the logic control circuit is further configured to control the isolation charging circuit according to the state signal. a battery electric cell, a switch device, a voltage boost circuit, a state detection circuit, and a logic control circuit, wherein the switch device is connected in a current path of the battery electric cell; the voltage boost circuit is connected in parallel to the current path, and is configured to boost an output voltage of the battery electric cell; the state detection circuit is configured to detect a state of the battery electric cell and a state of the apparatus, and generate a state signal, wherein the state signal is used to indicate the state of the battery electric cell and the state of the apparatus; and the logic control circuit is configured to receive the state signal from the state detection circuit, and control the switch device and the voltage boost circuit according to the state signal, and when the battery electric cell is in an abnormal charging state in which charging current is greater than an allowed maximum charging current, control the switch device to turn off the current path, and when the voltage boost circuit is not required to work, turn off the voltage boost circuit and control the switch device to turn on the current path; wherein the apparatus further comprises an isolation charging circuit, connected in parallel to the current path and the voltage boost circuit, and configured to charge the battery electric cell and isolate the output voltage of the battery electric cell from the output voltage of the apparatus, wherein the logic control circuit is further configured to control the isolation charging circuit according to the state signal.