The heat generation for lithium ion cell containing LiFePO4 as cathode and graphite as anode at different charge/discharge rates is compared. The experimental measurement was made using an isothermal calorimeter consisting of a copper chamber maintained at 25 °C and cell temperature was held constantly at 40 °C in the middle of chamber. The heat generation was calculated from the subtraction of cell heat power with baseline power at 40 °C during cell rest period. Endothermic heating at the beginning of charge was apparent at different charging rates, and exothermic heating began quickly at less than 10% state of charge (SOC). The exothermic heating trend was continuing until the 100% SOC, but the heating profile was interesting at each SOC. During discharge, the rate of heat generation increased with increase in the discharge rates. The maximum heat generated at C/5 and C/2 discharging rates were ∼0.54 W and ∼0.17 W, respectively. The thermoneutral potentials were also calculated following thermodynamic equations, and the results showed variability for different charge and discharge rates. Commercially available 26650 format cylindrical cell was used for this research.
Electrochemical-calorimetric studies on the thermal characteristics of LiFePO4/graphite cell
EVS, Electric Vehicle Symposium, 26 ; 130-136
2012
7 Seiten, 5 Bilder, 4 Tabellen, 6 Quellen
Conference paper
English
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