Voltage measurement device and cell stack system

A voltage measurement device that measures a voltage of at least one battery cell among a plurality of battery cells connected in series, the voltage measurement device comprising:

• one or more voltage detection circuits, wherein
• each of the one or more voltage detection circuits includes:
• a first communication path;
• a second communication path different from the first communication path;
• a mode control circuit that switches a mode of operation of the voltage detection circuit between a normal mode and a low-power mode that consumes less power than the normal mode;
• a first communication control circuit that transmits and receives a command signal to and from the first communication path;
• an activation signal detection circuit that detects a first activation signal input from the first communication path or the second communication path;
• a first activation signal generation circuit that generates a second activation signal;
• a first alarm detection circuit that detects a first alarm signal input from the first communication path or the second communication path;
• and
• an alarm generation circuit that, in the low-power mode, generates a second alarm signal indicating an anomaly in the plurality of battery cells,
• in the low-power mode, when the activation signal detection circuit detects the first activation signal input from the first communication path, the mode control circuit switches the mode of operation to the normal mode, and
• when the first alarm detection circuit detects the first alarm signal input from the second communication path, the alarm generation circuit outputs the second alarm signal to the first communication path.