| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost control valve type lead-acid battery excelling in a discharge capacity, a cycle life and charging efficiency and facilitating the injection of an electrolyte. SOLUTION: In this control valve type lead-acid battery, 0.5-5.0 mass% of silica fine particles and 0.25-3.0 mass% of aluminum sulfate are added in the electrolyte. In the control valve type lead-acid battery, since an appropriate amount of silica fine particles is added in the electrolyte, the electrolyte is moderately gelled and a stratification phenomenon hardly occurs. Thereby, the control valve type lead-acid battery excels in discharge capacity (initial capacity ratio) and cycle life, has a good electrolyte injection property, and is manufacturable without needing much material cost. In addition, the control valve type lead-acid battery excels in charging efficiency because an appropriate amount of aluminum sulfate is added in the electrolyte. COPYRIGHT: (C)2006,JPO&NCIPI
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