SECONDARY CELL AND METHOD OF OPERATING THE SECONDARY CELL

摘要

A secondary cell operable under high load regardless of the discharge state thereof during stationary operation and a method of operating the secondary cell, the secondary cell comprising first tanks (31) and (32) for storing electrolyte during the stationary operation and second tanks (33) and (34) for storing electrolyte in an emergency operation, wherein the electrolytes in the first tanks (31) and (32) and second tanks (33) and (34) are circulated to a cell stack (100) by selectively opening and closing valves (41 to 48) and the electrolyte in the second tanks (33) and (34) is such that the ratio of the amount of the active material generated by a charging reaction to all the amount of active material is 50% or more.