Influence of aging on the heat-release of the lithium iron phosphate battery under adiabatic conditions

doi:10.12028/j.issn.2095-4239.2016.0084

Abstract

Abstract: An Accelerating Rate Calorimeter was employed to study the heat release of lithium iron phosphate battery with different ageing status under adiabatic condition. Thermal behavior of lithium iron phosphate battery charged and discharged at 1C was researched，and the influence of cycle number, cycle rate, storage time and storage temperature on the overcharge test of lithium iron phosphate battery was studied. With the increase of the cycle numbers, the average power of the battery charge-discharge and overcharge increases. The raising range of the temperature and average heat power of the battery cycled at 1C is decreased, compared with that of battery cycled at 0.5C. This may be due to the decomposition of the electrolyte and the formation of a thick surface film, leading to the reduction of the total heat and average power, when the battery is cycled at high rate. With the increase of the storage time at the high temperature, the average power of the battery charge-discharge and overcharge increase as well. Furthermore, the raising range of the temperature and average heat power of the lithium iron phosphate battery with 100% SOC full power of the battery is smaller than that of battery with 50% SOC, which may be related to the stronger decomposition of the electrolyte at high state of charge. In the case of similar capacity loss, the influence of storage on the average power of the charge-discharge and the overcharge for the lithium iron phosphate battery is greater.

Key words: lithium ion battery, aging, adiabatic condition, heat-release

LUO Ying1,2,3, LV Taolin1,2, ZHANG Yixiao2,3, YAN Liqin2,3, LIU Hui2,3, XIE Jingying1,2,3. Influence of aging on the heat-release of the lithium iron phosphate battery under adiabatic conditions[J]. Energy Storage Science and Technology, 2017, 6(2): 237-242.

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