| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery inspection method for enabling highly accurate inspection, while reducing cost required for an inspection process by reducing inspection time.SOLUTION: An inspection method of a secondary battery 1 executes a discharge step only once to discharge the secondary battery 1 from an initial voltage Vs to a discharge end voltage Ve with a discharge current I, to inspect capacity and output of the secondary battery 1. The output inspection includes the steps of: stopping discharge for a time Ts when the battery is discharged from the initial voltage Vs to a voltage V3; measuring a first amount of voltage drop &Dgr;V1 of the secondary battery 1 for a time T1 from the restart of discharge; measuring a second amount of voltage drop &Dgr;V2 for a time T2 from the time when the voltage of the secondary battery 1 reaches a voltage V4; calculating conductivity of the secondary battery 1 on the basis of the discharge current I, the first amount of voltage drop &Dgr;V1, and the second amount of voltage drop &Dgr;V2; and comparing the conductivity with a threshold to determine whether an output of the secondary battery 1 having a correlation with the conductivity is proper or not. |
