Ensuring the uniformity of temperature within the battery module is of paramount importance in the design of the battery thermal management system. In this paper, electrohydrodynamic based ionic wind flow is coupled with conventional air-cooling technique to enhance the heat transfer efficiency and temperature consistency of both individual batteries and battery packs under high discharge rates. At varying Reynolds numbers corresponding to different inlet velocities, the ionic wind regulates the creation of a boundary layer on the heated surface. The average Nusselt number with the ionic wind is 6 times to those compared to without ionic wind for battery pack at different Reynolds number. This leads to decrease in Tmax by 49.4 % for single battery and 64 % for battery pack at optimum Reynolds number. Temperature difference in battery pack is also reduced to 5.5 °C with ionic wind, which is 28°C without ionic wind.