| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery capable of restraining local degradation of an active material layer and of extending its service life. SOLUTION: This secondary battery has a separator 1, a positive electrode and negative electrode active material layers 5, 3 facing to each other across the separator 1, a positive electrode current collection sheet 4, a negative electrode current collection sheet 2, a positive electrode terminal electrically connected to the positive electrode current collection sheet 4, and a negative electrode terminal electrically connected to the negative electrode current collection sheet 2. The battery is so designed that the electric resistance of a current path through which the current generated in certain facing parts 402a, 402b of the positive electrode and negative electrode active material layers 5, 3 reaches the positive electrode terminal and the negative electrode terminal via the positive electrode and negative electrode current collection sheets 4, 2 is set to a constant value even if the parts are located in any parts of the positive electrode and negative electrode active material layers.
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