| 摘要 |
PURPOSE:To improve the service life property in the charge and discharge cycle including a deep discharge by using a lead alloy including a low density of antimony as the positive electrode grid body, and increasing the thickness of an active substance layer around the grid body. CONSTITUTION:As a positive electrode grid body, a lead binary alloy or a lead plural alloy including 1.0-3.0wt.% of antimony is used, and the thickness of an active substance layer around the positive electrode grid body is made 3.3mm or more. The lead dioxide being the positive electrode active substance adsorbs the antimony, and functions to prevent the movement of the antimony to the negative electrode plate. As a result, by suppressing the melting-out of the antimony from the grid body, and by increasing the thickness of the positive electrode active substance to increase the capacity of the positive electrode active substance to adsorb the antimony, that is, to increase the capacity of the positive electrode active substance to adsorb the antimony layer more than the melting-out amount of the antimony, the antimony is prevented from reaching to the negative electrode plate, and the hydrogen over voltage is never deteriorated. Consequently, even though the battery is used for a repeating charge and discharge including a deep discharge, an excellent cycle life can be obtained. |
