Abstract: The inspection device includes a charging unit and an inspection unit, and detects the connection anomaly by retrieving a first cell voltage at the early stage of start of the constant-current charging and a second cell voltage at a stage where the charging has progressed to determine deviations from the average value of all the cell groups.

Abstract: The inspection device includes a charging unit (2) and an inspection unit (3), and detects the connection anomaly by retrieving a first cell voltage (V1) at the early stage of start of the constant-current charging and a second cell voltage (V2) at a stage where the charging has progressed to determine deviations (DV1, DV2) from the average value of all the cell groups (C?). A cell group (C?) in which the deviation (DV1) of the first cell voltage (V1) is small and the deviation (DV2) of the second cell voltage (V2) is large is judged to have a parallel connection anomaly (step 13). If the deviations (DV1, DV2) are both large and equal to each other, it is judged as a cell group having a series connection anomaly (step 21).