| 摘要 |
PROBLEM TO BE SOLVED: To provide an alkaline storage battery excellent in battery characteristics, free from short circuit and long in life by arranging separators each having a hydrophilic property, strength, and stability within an electrode group. SOLUTION: A fluorine-treated separator 12 having strength higher than that of a sulfuric acid-treated separator 11 is arranged outside a positive electrode 14 of an electrode group. Since the tensile strength of the fluorine-treated separator 12 arranged outside the positive electrode 14 is high, the crack, burr, and breakage or damage of the active material do not penetrate through the separator 12 even when the crack, burr, and breakage or damage of the active material are generated on the positive electrode 14 of the spiral electrode group 10a. By this, the short circuit can be prevented. Further, as the sulfuric acid-treated separator 11 arranged inside the positive electrode 14 can trap nitrogen-containing impurities dissolved out in the electrolyte, self discharge can be prevented. COPYRIGHT: (C)2004,JPO
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