Finite Element Analysis on Thermal Effect of Power Lithium Ion Battery for Electrical Vehicle

Abstract

To investigate the influence of discharge current, ambient temperature, convective heat-transfer coefficient and emissivity on the heat dissipation capability for power LiFeO4 (LPF) battery, a three-dimensional transient thermal model for a rectangular one is established and its temperature field distribution is simulated under different discharge conditions. The results show that the maximum temperature increases obviously with increasing discharge current and increases with the increase of the ambient temperature. Moreover, the influence of the emissivity on the battery surface temperature in natural convection is obvious, but it has little influence in forced convection. And furthermore the influence of the emissivity on the temperature on the battery surface in low ambient temperature is obvious, whereas it's not obvious in high ambient temperature.