Quantifying cell-to-cell variations of a parallel battery module for different pack configurations

Abstract Cell-to-cell variations can originate from manufacturing inconsistency or poor design of the battery pack/thermal management system. The potential impact such may limit energy capacity pack, which for electric vehicle applications leads to reduced range, increased degradation along with state health dispersion within a pack. latter is known reduce accessible and overcharging/discharging some cells system, cause safety concerns. This study investigates short-term effects, highly important designing an storage A generic pack model comprising individual cell models developed in Simscape validated 1s-15p module architecture. results highlight that number interconnection resistance values between are dominant factors cell-to-cell variation. Z shape architecture show significant advantage over ladder configuration due on differential current flow module. Current imbalance significantly higher system its magnitude not dependent current. Capacity variation does have By increasing 9% 40% inhomogeneity increases 4% 13%, whilst 25% 22% dispersion. Further, linear relationship observed thermal gradient ( Δ T ). 30 °C 24%