MANUFACTURE OF ALKALINE BATTERY

摘要

PURPOSE:To simplify the manufacture process of alkaline battery employing a negative pole containing hydrogen absorbing alloy by executing hydrogenation and activation of hydrogen absorbing alloy simultaneously under cell construction. CONSTITUTION:MmNi2.5Co2.5 (Mm: mixture of rate earth metal) and LaNi3Co2 are employed respectively as hydrogen absorbing alloy having high or low hydrogen balancing pressure in alkaline battery. Then they are mixed and pressure filled in nickel porous member under foaming to produce a negative pole. The negative pole is assembled with a separator and a positive pole and placed in a battery jar to produce a battery. Said battery is contained in an enclosed container then evacuated and hydrogen gas of 2 bar is applied with the temperature of 20 deg.C. Hydrogen absorbing pressure of MmNi2.5Co2.5 and LaNi3Co2 under the temperature of 20 deg.C are 3 and 0.5 bar respectively. In such a manner, only LaNi3Co2 having low hydrogen balancing pressure is hydrogenized and MmNi2.5Co2.5 having high hydrogen balancing pressure is activated. When executing hydrogeneration and activation simultaneously under battery construction, the manufacturing process is simplified while the rejection rate is reduced and the battery performance is improved.