Loss verification of Li-ion battery cell from thermal flow measurements

Paper in proceeding, 2025

This paper investigates heat generation in lithium-ion battery cells, a critical factor influencing the performance, lifespan, and safety of batteries, particularly in electric vehicle applications. Using an isothermal heat conduction calorimeter, heat flow measurements were performed on a commercial 850 mAh lithium-ion pouch cell. The sensitivity of the calorimeter demonstrated a capability of measuring heat flow levels down to 6 mW. By quantifying the contributions of the irreversible and reversible heat components, the entropic profile of the cell was determined. This study highlights the necessity of accurate heat flow measurement and emphasizes challenges posed by heat leakage and measuring low power detection using this calorimetric method.