A bi-directional cell voltage equalization system with implantable modules

This paper presents a novel cell voltage equalization system, which employs cell management modules that can be attached with individual cells in a battery bank. A unique resonant bi-directional DC-DC converter topology is employed to facilitate bi-directional energy transfer between cells and the battery bank. A mathematical analysis of the bi-directional resonant DC-DC converter system is presented followed by the development of prototype system suitable for a battery bank consisting of series connected TS-LPF100AHA lithium-ion polymer batteries. Finally, simulated results gathered from a 3-cell 100 Ah battery bank are presented to validate the viability of the proposed system as a modular, extendible and cost effective solution.