Abstract: A DC arc signal generation circuit comprises: a first power supply, a first switch unit, and a Wien bridge oscillator circuit, and the Wien bridge oscillator circuit includes an operational amplifier. The first power supply is electrically connected to a positive input terminal and a power supply terminal of the operational amplifier respectively through the first switch unit. The Wien bridge oscillator circuit is configured to output a DC arc detection signal in response to turn-on of the first switch unit.

Abstract: A signal latching circuit includes a controller, a latch, and a first reset apparatus. The controller is electrically connected to both the latch and the first reset apparatus, and the latch is configured to be electrically connected to a switch on a charging path and/or a discharging path. The controller is configured to transmit a first signal to the latch and transmit a second signal to the first reset apparatus, where the first signal is used to control the switch to turn on, and the second signal is used to indicate that the controller is in a working state. The first reset apparatus is configured to transmit a first reset signal to the controller in response to not receiving the second signal within a first duration. The latch is configured to latch the first signal during a reset period of the controller.

Abstract: A switch circuit includes: a power supply; a first switch, where a first terminal of the first switch is electrically connected to the power supply; an isolation driving module, where a second terminal of the first switch is electrically connected to an input terminal of the isolation driving module, and the power supply is configured to supply power to the isolation driving module via the first switch; and a second switch, where a control terminal of the second switch is electrically connected to an output terminal of the isolation driving module, and the second switch is configured to turn on or off in response to an output signal of the isolation driving module. The second switch is turned on in response to the first switch being triggered under a first condition; and/or the second switch is turned off in response to the first switch being triggered under a second condition.

Abstract: An electrochemical apparatus includes a battery management system, a battery unit, and a switch unit. The switch unit is electrically connected between the battery management system and the battery unit. The battery management system is configured to obtain a state of charge of the battery unit; and under a condition that the state of charge is less than a preset threshold and the electrochemical apparatus has not obtained a charging current transmitted by an external charging device, the battery management system outputs a first signal to the switch unit, and the switch unit switches off an electrical connection between the battery unit and the battery management system according to the first signal.