Design of Experiments Methodology Applied to Satellites Lithium Batteries Aging Modeling

This paper is dedicated to the accelerated cycling aging modeling of lithium-ion batteries for satellite applications. Due to the current international context, lifespan of satellites is of dramatic importance. In particular, the impact of the current rate and the depth of discharge on the residual capacity is investigated. The design of experiments methodology is used in order to obtain efficiently the data necessary for modeling. In space applications, numerous are the variables that affect degradation. Notably, the frequency of eclipses and their duration mainly dictates an Earth-orbit satellite battery work schedule according to its mission. Two empirical modeling approaches are tested. The first one is based on a two-parameter power law approach commonly adopted in the literature. A second and new model is then proposed in order to improve in prediction accuracy the previous one. This original work is achieved thanks to the separation of the degradation contributions on the total aging.