| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery condition estimating method and a power supply system, capable of reducing a transient change of a response voltage due to a repeated discharge and highly accurately estimating the deterioration or the discharge capability of a battery. SOLUTION: In the battery condition estimating method, a recovery time after the discharge is increased together with the number of times of discharges, and a relation between the number of times of the discharges and the recovery time is approximated by using an exponential function. By using the recovery time obtained from an approximate expression to form a discharge pattern as shown in Fig.1 and the battery is discharged in accordance with the discharge pattern to obtain a substantially constant response voltage. From a measured response voltage and a discharge current, an impedance during a semi-stable state is calculated to decide the deterioration or the discharge capability of the battery therefrom. COPYRIGHT: (C)2011,JPO&INPIT |
