Nickel metal hydride battery and capacity recovery method for nickel metal hydride battery

摘要

PROBLEM TO BE SOLVED: To make it possible to effectively and efficiently recover a nickel hydrogen battery whose capacitance is reduced by accumulation of hydrogen to a negative electrode.SOLUTION: The capacitance recovery method of a nickel hydrogen battery includes: executing a first step for providing a third electrode 4 capable of selectively energizing one of a positive electrode 2 and a negative electrode 3, and energizing between the third electrode 4 and the positive electrode 2, in order to charge the positive electrode 2; and then, preparing for ordinary charging by executing a second step for discharging between the positive electrode 2 and negative electrode 3 and performing a recovery treatment of the nickel hydrogen battery.