LEAD-ACID BATTERY AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To suppress the corrosion of a positive electrode grid body for a battery and elongate its life by providing the positive electrode plate formed by filling the positive electrode grid body having lead as its major component with a positive electrode active material having lead dioxide as the major component and setting the concentration of sodium sulfate surface of the positive electrode body lower than the concentration of the sodium sulfate adjacent to positive electrode plate surface. SOLUTION: The concentration of the sodium sulfate adjacent to a positive electrode grid body is lower than that on the positive electrode plate surface so that the corrosion of the positive electrode grid body by sulfate ions is suppressed and the life of the lead battery is elongated. If a positive electrode active material adding to sodium sulfate fills adjacent to the positive electrode grid body and a positive electrode active material adding sodium sulfate 0.5-10 wt.% relative to the positive electrode active material fills adjacent to the positive electrode plate surface, the life of the lead-acid battery is elongated with the conductivity in over discharge held as it is and the using rate of the positive electrode active material is improved. A plurality of active material layers are formed on the positive electrode active material, a positive electrode active material layer adding no sodium sulfate may be arranged adjacent to the positive electrode grid body, and a positive electrode active material layer adding sodium sulfate 0.5-10 wt.% relative to the positive electrode active material may be arranged adjacent to the positive electrode plate surface.