Abstract: A liquid leakage detection circuit including: a sampling circuit, the sampling circuit having an output end connected to an input end of an excitation source circuit and used for sending a control signal to the excitation source circuit; and the excitation source circuit , the excitation source circuit having an output end connected to a signal detection circuit and used for generating an excitation signal on the basis of the control signal and sending the excitation signal to the signal detection circuit, and the excitation signal being a periodic pulse signal. The sampling circuities further used for collecting a liquid leakage state signal of a battery pack in the signal detection circuit, wherein the liquid leakage state signal is generated in response to the excitation signal, so that liquid leakage detection for the battery pack can be achieved. A liquid leakage detection system and a battery management system is disclosed.

Abstract: A power supply control circuit, a power supply control method, and an apparatus are disclosed. The power supply control circuit includes a first power module, a second power module, and a switch module; where the first power module is connected to an electric module; the second power module is connected to the electric module through the switch module; in a case that a voltage of the first power module is greater than or equal to a threshold voltage, the switch module is turned off, and the first power module is configured to supply power to the electric module; and in a case that the voltage of the first power module is less than the threshold voltage, the switch module is turned on, and the second power module is configured to supply power to the electric module. According to embodiments of this application, power supply reliability can be improved.

Abstract: A battery management system and an electric device. The battery management system comprises a first circuit and a protection circuit, wherein the first circuit is connected to the protection circuit, and the protection circuit is used for reducing the amplitude of an interference signal entering the first circuit. The electric device comprises a battery and the battery management system.

Abstract: A drive circuit (10) and an electrical apparatus (100) are disclosed. The drive circuit (10) includes a driving module (11) which is connected to a driving end of an active fuse (20) and configured to provide a constant current and a constant voltage. The active fuse (20) blows under the driving of the constant current, and is conducted under the driving of the constant voltage. The problems in related technologies of switching devices (Q2, Q3) being prone to burning out or erroneous detection of the status of the active fuse (20) can be solved.