Investigation of the effect of vibration on the thermal field of real and simulated lithium-ion batteries
Electric and hybrid electric vehicles are gaining popularity because of depleting conventional sources of energy and climate change. However, the design of electric vehicles requires the fundamental understanding of vibration's effect on the thermal behavior of the battery. This thesis presents an experimental analysis on the effect of vibration on the thermal behavior of real and simulated Lithium ion batteries at three discharge rates (i.e., 1 C, 2 C, and 3 C), three different vibration frequencies (i.e., 10 Hz, 20 Hz, and 30 Hz), and three different amplitudes of vibrations (i.e., 40 mm/s, 55 mm/s, and 70 mm/s). Battery surface temperatures are measured using thermocouples and infrared camera. Top region of the battery heats up faster, but a uniform temperature distribution is observed later as the experiment continues. The surface temperature of the battery increases with the discharge rate. The effect of vibration on temperature rise is pronounced in real batteries with a maximum difference of 5 ℃. The variation of average Nusselt number with time is calculated. The findings of this study will assist in the development of efficient battery thermal management designs for electric vehicles.