Advanced Electro-Thermal Modeling of Lithium-Ion Battery System for Hybrid Electric Vehicle Applications

Abstract

The successful implementation and commercialization of hybrid electric vehicles (HEV) rely largely on energy storage systems. Lithium-ion batteries offer potential advantages in energy density, power density, and cost for this purpose. One of the challenges imposed by lithium-ion battery is the thermal management. The best operating temperature of lithium-ion battery is from -10degC to 50degC. An effective thermal management system is critical to maintain the health and life span of the battery. A good thermal management system starts with accurate prediction of the thermal conditions of the battery. This paper is aimed to evaluate the thermal management system of a lithium-ion battery pack designed for HEV applications, including estimating the thermal loss of the battery pack based on electric characteristics and experiments; predicting the temperature rise of the battery pack based on the test results of a single cell, and modeling the temperature gradients of the battery pack under different operating conditions.