| 摘要 |
<p>When impedance calculating conditions are satisfied after a system is started, the impedance Zn of a battery is calculated using the current of the battery I, a time variation in open circuit voltage DVOC thereof, a time variation in terminal voltage DVB thereof, a time variation in current DIB thereof, and a time variation in impedance DZ thereof (S6). The ratio Krz of the calculated impedance Zn to the initial impedance Zi is calculated (S7). The impedance ratio Krz is subjected to weighting and averaging, thus obtaining a weighted average Krc (S8). When the system is terminated, an impedance-correction-coefficient learned value Krl is updated using the weighted average Krc (S10). Thus, a change in impedance of the battery can be accurately grasped. Advantageously, parameters indicating the state of the battery, e.g., the remaining capacity thereof, reflect the change in impedance, resulting in accurate battery management.</p> |
