Experimental Study on Series-Parallel Grouping Inconsistency of Zinc–Nickel Single Flow Batteries

摘要

This study experimentally investigated the effects of the charge/discharge current, initial state of charge(SOC), internal resistance, and initial nominal capacity on the performance characteristics and efficiencyof series-parallel battery to address the inconsistency problems of zinc–nickel single flow battery duringthe use of battery pack energy storage system. Experimental results show that the differences incharge/discharge current, initial SOC, and initial capacity change the inconsistency of battery pack. Thedifference in initial nominal capacity is the most influential factor, whereas the charge/discharge currentis the least influential factor. Meanwhile, the inconsistency of internal resistance increases, whichenlarges the energy loss of the battery pack and increases the temperature. The optimum operatingcurrent is below 30 A and the optimum deviation in initial SOC is within 10%, at which the inconsistencyof the zinc–nickel single flow battery pack and the balance of the branch current are satisfactory.