| 摘要 |
PURPOSE:To prevent the occurrence of self-discharge with the elution of copper restrained to forming solution by electrically connecting a negative electrode plate for polarization to the conductive frame body of the cathode, and thereby keeping its potential lower than OV at all times. CONSTITUTION:A negative electrode plate having been formed using spongy lead as active material, is connected to a conductive frame body made of copper as a cathode plate for polarization so as to be immersed in forming solution. Next, the lug of an unformed negative electrode plate is brought into contact with the conductive frame body so as to be formed with main current fed. By this constitution, the potential of the conductive frame body of a negative electrode is kept lower than that of reference hydrogen and an electrode, the electrode plate is put into a forming tank, simultaneously copper is restrained from being eluted with potential kept low. Therefor, no hydrogen overvoltage of the negative electrode is lowered, negative electrode plate less in self- discharge can thereby be obtained. |
