BATTERY MANAGEMENT SYSTEM

A single-line communication circuit includes a first switch module, a second switch module, a third switch module, and a fourth switch module. The first switch module is configured to switch on or off according to a first signal sent by a first signal terminal outside the single-line communication circuit; the second switch module is configured to switch on or off according to a switching status of the first switch module, to transmit the first signal to a second signal terminal outside the single-line communication circuit; the third switch module is configured to switch on or off according to a second signal output from an output end of the second signal terminal; and the fourth switch module is configured to switch on or off according to a switching status of the third switch module, to transmit the second signal to the first signal terminal outside the single-line communication circuit.