| 摘要 |
PURPOSE: An SOC estimation method using a polarizing voltage and an open circuit voltage is provided to estimate the state of charging of a battery by using internal resistance and the polarizing voltage per temperature and per current. CONSTITUTION: Idle time in case of initial power-on is judged in order to calculate the state of charging of an initial battery. When the battery is not used for more than a constant time, the state of charging of the battery is estimated by measuring an open circuit voltage per temperature. When the idle time is less a predetermined constant time, the stored existing state of charging of the battery is used. [Reference numerals] (AA) Start; (BB) Measure current and temperature; (CC) Estimate an initial SOC value through OCV data; (DD) OCV state? Rest time > 15 minutes ?; (EE) Use the SOC value stored in a memory; (FF) Measure voltage, current, and temperature; (GG) Load state?; (HH) Calculate a polarization potential by temperature and current; (II) Estimate residual quantity of a battery; (JJ) Store the SOC value in the memory |
