A0665
Title: Estimating the useful life of lithium-ion battery pack based on a mixed effect degradation model
Authors: Shuen-Lin Jeng - National Cheng Kung Univeraity (Taiwan) [presenting]
Abstract: Generally speaking, the reliability of a module composed of components can be directly calculated by the system reliability theory through the component life distribution, but this calculation cannot be directly applied to the actual conditions of lithium-ion battery modules. The failure time distribution of a single Li-ion cell is derived from the experimental discharge degradation path of a single Li-ion cell, and then the system reliability theory combined with a simplified electrical model in electrochemistry is used to develop a mixed effect capacitance degradation model for estimating the remaining life of a Li-ion battery pack. The proposed method can use less than 50\% of the entire life cycle data of a single cell to determine the remaining life distribution of a lithium-ion battery cell. The reliability and lifetime of packs with different series-parallel configurations can then be calculated. The importance of consistency in the life distribution of lithium-ion single-cell batteries is verified, and the optimal series-parallel connection method for lithium-ion battery packs is compared.
