Battery module, power supply system and control method

The invention is suitable for the technical field of battery communication, and provides a battery module, a power supply system and a control method. The battery module comprises a charging and discharging interface and a pulse interface; the charging and discharging interface and the pulse interface are connected with power equipment; and the pulse interface is used for receiving a pulse signal sent by the power equipment. The battery module further comprises a first switch unit, a second switch unit, a battery body and a BMS control unit, wherein the BMS control unit comprises a trigger end and a power supply end; the trigger end is connected with the pulse interface, and the power supply end is connected with the battery body through the second switch unit; the pulse signal is used for supplying power to the BMS control unit in a short time through the trigger end; and the battery body is used for stably supplying power to the BMS control unit when the second switch unit is closed. The service life of the