Analysis of internal resistance and heat production of battery by chemical-thermal coupling
Li-ion battery generates a lot of heat during operation,so the study of the battery heat production mechanism and its influence on the internal resistance is significant.The effects of ambient temperature,state of charge(SOC)and cathode material on internal resistance are analyzed by hybrid pulse power characterization(HPPC)tests.An electrothermal coupling model based on lumped battery module is established,the effects of discharge rate and ambient temperature on the surface temperature of the battery are analyzed.With the change of SOC,the resistance shows a trend of high at both ends and flat in the middle.As the ambient temperature increases,the internal resistance of the battery shows a decreasing trend.At SOC of 0.1 and 0.9,the internal resistance at 15℃and 25℃is about 2.0 times and 1.5 times of that at 35℃,respectively.The cathode material is an important factor that causes the significant change of the internal resistance of the battery.The heat production of the battery increases with the increase of discharge rate,the temperature rise is more obvious at low temperature.
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