This work presents the modeling and control of a lithium-ion battery energy storage system based on a three-phase AC-DC converter connected in cascade with a bidirectional DC-DC converter. The development stages involve the mathematical modeling of the converters in their different operating modes, followed by the linearization of the dynamic model. Subsequently, transfer functions are derived and used to design the controllers responsible for regulating the battery charge and discharge currents, as well as the DC bus voltage. The results obtained through digital simulations carried out in the PLECS software were used to validate the theoretical analyses developed.