Among RFB technologies, vanadium redox flow batteries (VRFBs) stand out due to their good performance and strong near-term commercialization potential . They offer several advantages that make them a promising large-scale stationary energy storage solution: high round-trip energy efficiency, excellent scalability, long cycle life, deep discharge capability, and high safety compared to other types of batteries. However, a significant drawback of VRFBs is their capacity decay during cycling, mainly caused by ion crossover , hydrogen evolution , or imperfect electrolyte mixing in the tanks . This makes the total vanadium concentration and the State of Charge (SoC) to drift away from the ideal symmetric state between the negative and positive electrolytes, creating an undesired charge imbalance .