This thesis presents the specification, simulation, design, and experimental results of a resonant Dual Active Bridge based Battery Management System. The intention of the Sponsor, Sunshine Solar, was to create a cost-effective solution to battery energy storage. A review of existing circuit topologies was conducted. The resonant Dual Active Bridge was chosen and simulations conducted in LT SPICE to verify functionality. A planar transformer was designed to give low leakage inductance, low losses, and reproducible results for commercial production of the design.

The designed utilised a battery comprised of 16 Lithium-ion cells in series. The hardware was designed, built, tested, and compared to simulation results. Additionally, supervisory control was required which employed several microcontroller units and a communication system. The experimental results corroborated the simulation. These results revealed the primary limitation for high rates of charge transfer between cells is the combined resistance of circuit elements. Therefore, reducing cell path resistance was key to overall efficiency and performance.