From Cell to Module: Li-Ion Battery Performance Under Grid Peak Shaving Duty Cycles

Le résumé fourni par la source

Lithium-ion (Li-ion) batteries represent more than 90% of deployed battery energy storage systems (BESS), encompassing a wide range of chemistries, formats, and scales. Yet, evaluating their state-of-health during operation remains a major challenge, particularly as system size increases and access to detailed electrochemical data becomes constrained. This study examines the performance and degradation mechanisms of Li-ion battery modules by directly comparing them with identical single cells integrated within the modules. Both modules and single cells were subjected to standardized two-year peak shaving service tests developed by the U.S. Department of Energy Office of Electricity (DOE-OE). Results from nickel–manganese–cobalt (NMC:811) chemistry are presented, with comparative analyses of capacity retention, resistance growth, open-circuit voltage (OCV), cyclic voltammetry (CV), incremental capacity (dV/dQ), and AC impedance. These findings provide valuable insights into module-level degradation relative to single-cell behavior, advancing strategies for more accurate health diagnostics in large-scale BESS applications.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.