Thermal Characteristics of Iron Phosphate Lithium Batteries Under High Rate Discharge

An accelerated calorimeter (ARC) was used to accurately measure the total heat production of the battery under high rate discharge, calculate the heat production of the battery by the simplified Bernadi equation, calculate the irreversible heat of the battery by the potential method and the internal resistance method respectively, calculate the reversible heat by measuring the entropy heat coefficient, sum the irreversible heat and the reversible heat measured by different methods and compare them with the total heat production respectively, and conclude that under high magnification discharge using potential method is more accurate for heat generation estimation, and proposes a more accurate method for heat generation prediction of batteries in engineering, and provides a basis for battery assembly. Moreover, the experimental results indicate that under high-rate discharge (30C), the trend of the battery’s internal resistance with ambient temperature remains essentially the same as that observed during low-rate discharge (below 1C).