In this study, the thermal behavior of a 1S18P battery pack is examined based on the power demand during train propulsion between two stations. The proposed thermal prediction model is classified into Joules heating with equivalent resistance, reversible heat, and heat dissipation. The equivalent resistances are determined by 5% of the state of charge intervals using the hybrid pulse power characterization test. The power demand profile during train propulsion between two stations is provided by the Korea Railroad Research Institute. An experiment is conducted to examine the 1S18P battery pack thermal behavior during the propulsion between two stations. A comparison of the simulation and experiment results validated the proposed thermal model.

In this paper, the proper internal resistance is shown as a heating factor for heat generation estimation of a lithium-ion battery. Electrical equivalent circuit model is introduced to verify irreversible heat parameter. Internal resistance is comprised of ohmic resistance and diffusion resistance. Three methods for determining resistance are introduced: 1) direct current resistance method; 2) electrochemical impedance spectroscopy method(EIS); 3) heating based resistance. By comparing resistances measured by three different methods, the summation of ohmic resistance and diffusion resistance is shown as the heating factor of a lithium-ion battery. Finally, it's feasibility as heating parameter is validated by comparing generated heat during 1C-rate discharging experiment and COMSOL simulation.