RFBs have unique characteristics, such as decoupled energy and power, scalability, and potential cost-effectiveness, due to their liquid nature. Redox flow batteries (RFBs) or flow batteries (FBs)—the two names are interchangeable in most cases—are an innovative technology that offers a bidirectional energy storage system by using redox active energy carriers dissolved in liquid electrolytes. RFBs work by pumping negative and positive. Unlike general solid-state batteries, the positive and (or) negative electrolyte solutions of liquid flow batteries are stored in tanks outside the battery and transported to the inside of the battery through pumps and pipelines for reaction. Flow battery is a new type of battery. The primary innovation in flow batteries is their ability to store large amounts of energy. Learn how flow batteries use liquid electrolytes for large-scale energy storage and support renewable energy integration. Flow batteries represent a fascinating subset of electrochemical cells that are designed to handle large-scale energy storage, a critical component in modern energy grids. Flow batteries are electrochemical cells, in which the reacting substances are stored in electrolyte solutions external to the battery cell Electrolytes are pumped through the cells Electrolytes flow across the electrodes Reactions occur atthe electrodes Electrodes do not undergo a physical. This paper aims to introduce the working principle, application fields, and future development prospects of liquid flow batteries. We will delve into its working principle.