Analysing vibration environment of a power battery in a running electric vehicle

Abstract

Power batteries in electric vehicles are subjected to vibration during vehicle's driving. Clarifying battery vibration characteristics in service conditions is the basis for understanding battery performance and for structure improvement. The acceleration responses at multiple points on a battery pack are measured on various road conditions in this study. Indicators, namely, the standard deviation of acceleration root-mean-square (SD-ARMS) and fatigue damage spectrum (FDS), are introduced to analyse vibration differences among various positions and with vibration test standards. Time-forced vibration test profiles are derived based on the calculated FDS curves. The findings are first to indicate obvious vibration inconsistency among the sampling points in the Z direction, with high SD-ARMS values. The fatigue damage values computed from measured data and from standard vibration profiles significantly deviate. This research provides an intact method from measurements, and evaluates vibration levels to generate time-forced vibration profiles for battery durability assessment.