| 摘要 |
PROBLEM TO BE SOLVED: To provide an inspection method that can select a faulty battery before initial charging, does not generate heat abnormally, and can perform inspection quickly. SOLUTION: A closed circuit terminal voltage E at the time when a pulsive current is applied between the terminals of a secondary battery is measured, thus judging whether the battery is appropriate or not according to the closed circuit terminal voltage E. In this case, an internal resistance is equal to Rc and the closed circuit terminal voltage E when a pulsive current (i) is applied between the terminals of the secondary battery whose electromotive force is equal to E0 is equal to E0 + Rci. Although the internal resistance Rc changes due to the mixture of a foreign object, the shortage in electrolyte, and the like, which appears as the change in the closed circuit terminal voltage E according to the above expression. Failure such as the mixture of a foreign object and the shortage in electrolyte can be determined according to the change in the value. |
