From the point of view of control theory, the vanadium electrochemical model is the most interesting to analyze. First of all, as has been seen in previous Chap. 4, the vanadium electrochemical model allows to formulate the vanadium species dynamics, in terms of concentrations. By means of these concentrations it is possible to compute different variables and indicators, such as the battery voltage, the SOC or the SOH. These variables, as have been explained, are the most important ones since they allow to analyze the system behavior.