Patent attributes
This invention reduces degradation of respective lead storage batteries making up a lead storage battery bank and extends the longevity of the lead storage batteries. A lead storage battery system includes an individual battery state measurement unit 102 that measures current, voltage, temperature etc. of individual lead storage batteries 151 or lead storage battery modules 152 making up a lead storage battery bank 101, a state-of-charge model storage unit 103 that accumulates state-of-charge models representing a correlation between the battery states and a state of charge, a state-of-charge estimation unit 104 that estimates individual states of charge of the respective lead storage batteries 151 or lead storage battery modules 152 from the state-of-charge models and the battery states, a state-of-charge variation range determination unit 105 that calculates a state-of-charge maximum value and a state-of-charge minimum value, and an equalization-charging management unit 109 that controls performance of an equalization charge on the lead storage battery bank 101. The equalization-charging management unit 109 performs the equalization charge so that the state-of-charge maximum value falls within a range lower than an overcharge region and the state-of-charge minimum value falls within a range higher than a sulfation region.
