A Logic‐Driven Battery Balancing Technique for Second‐Life Battery Application in Small‐Scale Grid System

When an EV battery reaches an estimated percentage of 70 to 80% of its state‐of‐ health, it is often termed a second‐life battery (SLB). With the remaining usable life (RUL) of the SLB that is no longer able to perform its service over transportation applications, it can be repurposed to provide grid support within smaller communities. Despite having less power capability and energy capacity than its predecessor, this can be addressed with a more optimal battery balancing technique from the battery management system (BMS). The main contribution of this research is the development of a low cost, simple, high‐efficiency logic‐driven battery balancing technique of a BMS to improve power transfer capabilities in both operations of the SLB modules. It is observable that the proposed battery balancing technique yields a high‐efficiency energy distribution between modules ranging from 88.28% to 99.33% with low losses during battery balancing under a tolerable speed. Notably, the proposed battery balancing technique exhibits a remarkable performance for small‐grid applications when both its charging and discharging rates fall within the range of 0.3–1.5 and 0.3–0.5 respectively.