Event
Seminar on Advanced Experimental Characterization of Heat Generation Rates of Lithium Ion Batteries
Monday, November 10, 2025
11:00 a.m.
Glenn L. Martin Hall, EGR 1131B
Dr. Diganta Das
diganta@umd.edu
ABSTRACT:
The temperature in an operating battery strongly affects its performance. Therefore, a thermal management system (TMS) should be properly designed to reject the heat generated during the charging and discharging process in order to ensure a highly efficient and reliable operation of the battery system. Most battery system engineers take the temperature as a reference for their designs rather than the heat generation rate of the battery itself, which leads to inaccurate and oversized designs of the cooling system. Commercial equipment available for operando measurement of the heat generation rates has several limitations in accuracy, size of cells, and operating conditions, such as temperature and pressure gradients. Therefore, a team led by Prof Choe has developed an advanced calorimeter for lithium-ion batteries using thermoelectric assemblies (TEA), which enables measurement of heat generation rate as a function of C rates, state-of-charge (SOC), and temperatures under real operating conditions. Additionally, the calorimeter functions as a thermostat, capable of maintaining a reference temperature. These features facilitate decoupling the effects of varying temperature during operations and measuring the entropy coefficient, which is the key parameter that determines the amount of reversible heat generated.
In this presentation, an overview of approaches for lithium-ion battery research by modeling, experimental, and theoretical analysis, and advanced controls will be provided as an introduction. Then the presentation will focus on the principle of thermal behaviors of lithium-ion batteries and show a couple of examples of how to characterize heat generation rates of pouch and cylindrical cells, including the entropy coefficient, using the developed calorimeter.
ABOUT THE SPEAKER:
Song-Yul Choe is currently an endowed professor at the Department of Mechanical Engineering, Auburn University. Before joining Auburn University, he was the director of the HEV and EV program of Hyundai Kia Motor Company. His current research focuses on theoretical and experimental investigations of electrochemical devices such as fuel cells and batteries.
JOIN ONLINE: https://umd.zoom.us/j/
Location: Conference Room 1131B is in Suite 1131 of Martin Hall, along the hallway by the Resnik Lecture Hall. Suite 1131 entrance is next to the Engineering Copy Center.
