  The installation capacity of energy storage system, especially the battery
energy storage system (BESS), has increased significantly in recent years,
which is mainly applied to mitigate the fluctuation caused by renewable energy
sources (RES) due to the fast response and high round-trip energy efficiency of
BESS. The main components of majority of BESSs are lithium-ion batteries, which
will degrade during the BESS daily operation. Heuristic battery degradation
models are proposed to consider the battery degradation in the operations of
energy systems to optimize the scheduling. However, those heuristic models are
not evaluated or demonstrated with real battery degradation data. Thus, this
paper will perform a quality analysis on the popular heuristic battery
degradation models using the real battery aging experiment data to evaluate
their performance. A benchmark model is also proposed to represent the real
battery degradation value based on the averaged cycle value of the experimental
data.
