| 摘要 |
An alkaline secondary battery has a positive electrode plate having a predetermined shape, formed from a long-shaped electrode substrate. A manufacturing method thereof comprises an impurity detecting step for applying X-rays to the electrode substrate to acquire a transmitted image, and detecting based on the transmitted image whether a metal impurity particle made of a metal dissolved at a positive electrode potential and deposited at a negative electrode potential exists in the electrode substrate. The method includes a marking step for, when the metal impurity particle exists, applying a marking indicative of its particle-existing portion on the electrode substrate.
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