The cycle life of iron-chromium flow battery can reach 1, cycles at least, which is the same as that of all-vanadium flow battery, and its life is much longer than that of sodium-sulfur battery, lithium-ion battery and lead-acid battery. In this Winter Olympics, the iron-chromium flow battery-Ronghe No.1, which has independent intellectual property rights, has stably stored and provided clean electricity for the Winter Olympics area for more than 5W kWh.