Power supply device

A power supply device including a plurality of battery modules each including a secondary battery, in which the plurality of battery modules are connected in series to one another according to a gate driving signal from a controller and in each of the plurality of battery modules, the gate driving signal is delayed in a gate driving signal processing circuit included in a battery module and then transmitted from upstream to downstream of the series connection,

• wherein an ID is provided for each of the plurality of battery modules by transmitting an ID setting mode instruction signal for providing an ID unique to each battery module using a gate signal line for transmitting the gate driving signal;
• and
• wherein the ID setting mode instruction signal has a pulse waveform;
• and
• the gate driving signal processing circuit changes a number of pulses of the ID setting mode instruction signal received from the preceding battery module to a number of pulses for setting an ID unique to the subsequent battery module.