| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique which allows long-term capacity reliability to be ensured in a manufacturing stage of a secondary battery.SOLUTION: In an inspection system (secondary battery abnormality detection system 1), data 72 including information of a V-dQ/dV curve during initial charging of a secondary battery is stored in a ROM 31 as criteria. When a secondary battery 10 is initially charged from a power source 60 during inspection of the secondary battery 10, an abnormality detection unit 30 uses an amount Q of stored power, which is calculated from a current value detected by a current detection unit 50, to calculate a dQ/dV actual measurement value being a ratio of a variation dQ of the amount Q of stored power to a variation dV of a voltage value V detected by a voltage detection unit 40 and contrasts the calculated value with information of the V-dQ/dV curve to determine whether the calculated value corresponds to feature points on the curve or not and, if it does not correspond to them, detects abnormality (in which long-term capacity reliability cannot be ensured) of the secondary battery 10. |
