Patent ID: 7626394

Claim:
A method for detecting a state of charge (SOC) and a state of health (SOH) of a storage battery, comprising: calculating an SOC value of the storage battery with use of an SOC calculation unit based on a measured voltage value or a measured current value of the storage battery, and calculating an SOH value of the storage battery with use of an SOH calculation unit based on the SOC value; further calculating a new SOC value with use of the SOC calculation unit based on the SOH value and calculating a new SOH value with use of the SOH calculation unit based on the new SOC value, these further calculations of SOC value and SOH value being repeated a prescribed n times of at least one so as to obtain an n th calculated SOC value and an n th calculated SOH value; outputting the n th calculated SOH value as an SOH output value and outputting the n th calculated SOC value as an SOC output value; and storing the SOH output value into a memory.