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. With significant SD-ARMS values, the findings are the first to show clear vibration inconsistency among the sampling points in the Z direction. The fatigue damage estimates based on collected data and standard vibration profiles differ greatly. This study develops a method based on measurements and analyses vibration levels in order to build time-forced vibration profiles for assessing battery durability.