Novel and systematic validity assessment of Li-ion battery lifetime predictions

摘要

A realistic lifetime prediction approach for Li-ion batteries is presented. This paper especially focuses on the evaluation of combined calendar and cycle ageing, and proposes a stepwise validation methodology that includes complex realistic operation conditions. The ageing model developed for a LFP-based 26650-size battery cell can be used for the lifetime assessment of different Energy Storage System applications with high accuracy, as is the case for an elevator application considered as a case study. The ageing prediction root-mean-square error was just 1.35% after 180 days of battery cell testing. The model was also successfully validated for PHEV operation combined with V2G use.