Analysis of Temperature Field of Polymer Lithium-ion Battery under Discharge of High-ratio-current

Polymer lithium-ion battery produces large amount of heat under discharge of high-ratio-current to influence the function and safety of a battery. We establish three models of the battery and calculate their temperature fields by using the software ANSYS under discharge of high-ratio-current. The three models are established in the conditions of isotropic thermal conductivity without considering the sizes of positive and negative electrodes, of anisotropic thermal conductivity without considering the sizes of positive and negative electrodes, and of anisotropic thermal conductivity considering the sizes of positive and negative electrodes, respectively. Conclusions are drawn that the sizes of positive and negative electrodes of a battery have great influence on the distribution of temperature field; the errors in the as-sumption of isotropic thermal conductivity are larger than the ones in the assumption of anisotropic thermal conductivity. Therefore, analysis of the temperature fields of polymer lithium-ion battery must comprehensively consider the sizes of positive and negative electrodes and the anisotropy of thermal conductivity.