Patent ID: 8866443
Filing Date: 2014-10-21
Classification: G01R

Abstract:
1. A lead acid storage battery to be used in a natural energy utilization system, including: a storage battery state measurement unit for measuring a state of the lead acid storage battery; an SOC model representing the relationship between output factors including current, voltage, and temperature of the lead acid storage battery and a state of charge of the lead acid storage battery; and an equalized charge performance unit for performing equalized charge of the lead acid storage battery, the lead acid storage battery comprising: an SOC estimation unit configured to estimate a state of charge of the lead acid storage battery from the information measured by the storage battery state measurement unit and the information from the SOC model; an SOC transition database configured to record how a state of charge of the lead acid storage battery makes a transition; an SOC transition history management unit configured to record, in the SOC transition database, a value of state of charge estimated by the SOC estimation unit and to check an SOC transition situation; a degradation model representing the relationship between an operation situation of the lead acid storage battery including a state of charge of the lead acid storage battery and degradation; and an equalized charge optimal planning unit configured to plan an interval of performing the equalized charge based on the information on a center of the SOC transition from the SOC transition history management unit and the information from the degradation model.