[en] A mathematical model has been developed to study heat transfer and thermal management of lithium-polymer batteries. Temperature dependent parameters including the diffusion coefficient of lithium ions, ionic conductivity of lithium ions, transference number of lithium ions, etc., have been added to a previously developed electrochemical model to more completely characterize the thermal behavior of the lithium-polymer system. In addition, experimental studies of the discharge behavior and heat generation rate of lithium-polymer cells have been conducted. Comparisons between experimental and mathematical results are presented. Finally different thermal management approaches are discussed