Abstract
A spatially-resolved isothermal calorimeter has been developed to measure distributions of heat generation rates in a pouch-type lithium-ion battery. When a 20 Ah LiFePO4 battery discharges currents at constant rates, the total heat generation rates measured by the calorimeter change according to the states-of-charge (SOC). However, the spatial deviations of heat generation rates remain relatively steady. The maximum heat generation rate is detected in the vicinity of the positive tab. From the measurements, localized Joule heat generation in metal current collectors is noted as a predominant cause of the thermal non-uniformity in pouch-type batteries.
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