In this paper,the electrothermal characteristics and failure mechanism of lithium-ion batteries during external short circuit were analyzed,and the performance of batteries without thermal runaway in subsequent use and the potential thermal runaway risk were explored.The resultsindicated that the temperature and voltage changes of the battery during external short circuits were related to the internal resistance which changes with SOC and short-circuit current.Further external short-circuit batteries were accompanied by phenomena such as electrolyte evaporation,lithium metal deposition,electrode particle rupture,and membrane closure,which affect the internal Li+transport process.The battery without Thermal runaway was tested in the cycle.The battery capacity was recovered in the cycle,and the polarization internal resistance was reduced to the initial level,but the ohmic internal resistance was higher than the initial value.The potential risk of Thermal runaway inside such batteries was analyzed through the secondary short circuit.
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