State Detection Device for Power Supply System

A state detection device for power supply system comprising:

• a measurement unit that obtains current, voltage, and temperature at a chargeable and dischargeable power storage unit as measurement values;
• a storage unit that stores property information of the power storage unit;
• an arithmetic unit that uses different methods to calculate a first state of charge and a second state of charge, each of which indicates a state of charge of the power storage unit, based upon the measurement values and the property information stored in the storage unit;
• a conflict detection unit that monitors a calculation result of a state of charge by the arithmetic unit during charging or discharging of the power storage unit, and detects the calculation result as a conflict in an event that a difference between the first state of charge and the second state of charge is equal to or greater than a predetermined threshold;
• and
• a correction unit that corrects the property information stored in the storage unit during charging or discharging of the power storage unit in response to the conflict having been detected by the conflict detection unit.