Apparatus for calculating state of charge

摘要

When the sum of a first state of charge S1 of a first battery stack and a second state of charge S2 of a second battery stack is large, a higher state of charge is selected as a priority state of charge SMAIN. When the sum of first state of charge S1 of the first battery stack and second state of charge S2 of the second battery stack is small, a lower state of charge is selected as priority state of charge SMAIN. A first coefficient W 1 and a second coefficient W2 are set in accordance with priority state of charge SMAIN. Second coefficient W2 is set so as to be lower than first coefficient W 1. The product of first coefficient W 1and priority state of charge SMAIN is added to the product of second coefficient W2 and the other state of charge, to thereby calculate a state of charge STOTAL of a power storage system.