| 摘要 |
PROBLEM TO BE SOLVED: To provide a lead-acid battery reducing the decrease in the cross section of a continuous cast grid body by the corrosion and improving the battery characteristics. SOLUTION: The cross-sectional shape of an inner bone of the continuous cast grid body is set to a trapezoid having its upper bottom in a mold side. Therefore, even if each vertex part of the grid body is corroded, the cross section in the central part functioned as a collector becomes larger than the conventional one so as to improve the battery characteristics. The trapezoid forming the cross section of the inner bone of the continuous cast grid body is set to such a shape that the inscribed circle becomes the maximum in the same cross section so that, even if each vertex part of the cross section of the inner bone of the continuous cast grid body is corroded, the cross section of the central part functioned as the collector becomes further larger so as to improve the battery characteristics. The cross-sectional bottom of the trapezoid forming the cross-sectional shape of the inner bone of the continuous cast grid body is set to 750 or less, the rapid increase in the bending quantity of the grid body in releasing the mold is eliminated so as to reduce the fraction defective. |
