| 摘要 |
PURPOSE:To retard self discharge and decrease in electrolyte and to increase overcharging performance by fabricating a plate group by a cathode plate having a lead-calcium-tin alloy grid in which the content of calcium on the surface is lowered than that in the central part, an anode plate, and a separator. CONSTITUTION:A grid made of lead-calcium tin alloy is treated with strong alkaline solution to dissolve calcium on the surface of the grid and to decrease the concentration of calcium on the surface then that in the central part, then paste is filled in the grid to form a cathode plate. A plate group is fabricated by the cathode plate, a anode plate, and a separator. A decrease in electrolyte caused by overcharge is prevented, overcharge performance is increased without deterioration in the other performance, and a grid having high mechanical strength can be obtained. |
