Battery energy storage systems (BESS) are often viewed as solution to mitigate the
intermittency of renewable energies in electric grids. However, battery degradation
associated with grid-tied BESS usage has never been investigated in detail. This work was
aimed at understanding the impact of a BESS representative usage profile on the
degradation of commercial Li-ion cells. It was found that the cell temperature history had the
strongest impact on battery degradation followed by the C-rate and the state of charge …

Battery Energy Storage Systems (BESSs) can facilitate renewable energy sources
integration onto the grid. For this application, these systems are expected to last for a
decade or more, but the actual battery degradation under different real-world conditions is
still largely unknown. In this work, three years of lithium titanate BESS usage in Hawai'i were
analyzed. In addition, the representative usage was subjected on individual cells under
controlled laboratory conditions to study the degradation mechanisms and enable life …