| 摘要 |
<p>[Problem] To accurately estimate open-circuit voltage without waiting for stability in terminal voltage after charging/discharging has been stopped. [Solution] The open-circuit voltage value (OCVON:EST [tC0]) is estimated immediately prior to discharge stop on the basis of a measured electric current value (I) of the discharge and a measured voltage value of the terminal voltage with consideration given to the internal resistance of a cell unit. Alternatively, the open-circuit voltage value is estimated on the basis of the remaining capacity of the cell unit estimated from the integrated value of the measured electric current value (I). After discharging has been stopped, a transient response component of the voltage remaining in the cell unit is calculated as an initial remaining voltage value (VDIFF) from the difference between the measured voltage value (CCVOFF [tC1]) and the open-circuit voltage value (OCVON:EST [tC0]). The open-circuit voltage value is thereafter estimated on the basis of the initial remaining voltage value, a predetermined time constant, and the measured voltage value during the interval in which discharge is stopped, with consideration given to the fact that the transient response component attenuates with a predetermined time constant.</p> |
