Battery Peak Power Assessment Under Various Operational Scenarios: A Comparative Study
Ruohan Guo, Cungang Hu, Weixiang Shen
Abstract
The peak power capability of lithium-ion batteries (LIBs), or so-called state of power (SOP), plays a decisive role for electric vehicles (EVs) to fulfill a specific power-intensive task. Generally, battery SOP can be achieved based on different peak operational mode (POM), including constant current (CC), constant voltage (CV), CC and CV, or constant power (CP), throughout a prediction window. However, the impact of these POMs on battery peak performance and their interrelationship remain unclear by far. In light of this, we conduct a comparative study to fill this blank. Four key indices, including maximum and minimum instant magnitudes, time-averaged magnitude, and falling/rising rate, are adopted to evaluate battery peak performance under each POM. Potential factors, such as load profile, length of the prediction window, and battery chemistry, are considered in the comparisons. The results offer valuable insights into the distinct attributes of these POMs and their region-dependent interrelationship.