For charging and discharging, these are pumped through reaction cells, so-called stacks, where H+ ions pass through a selective membrane from one side to the other, while, in the external circuit, electrons travel in the same direction, inducing a current. . A flow battery is an electrochemical battery, which uses liquid electrolytes stored in two tanks as its active energy storage component. They're highly flexible and scalable, making them ideal for large-scale needs like grid support and renewable energy integration. You can increase capacity by adding more. . Liquid flow energy storage systems employ electrochemical reactions to facilitate electricity storage and retrieval, featuring four key elements: 1. Theelectrode interchange for energy conversion, 3. High scalability potential for varied. .