Time Interval Analysis on Calculation of Temperature Rise Rate of Lithium-ion Battery Thermal Runaway

Abstract

The battery temperature rise rate is an important monitoring parameter to judge the safety state of the lithium-ion battery. However, there is little research on how to calculate the value of battery temperature rise rate, and there is a big difference in the temperature rise of battery calculated at different intervals, which affects the accurate judgment of the battery safety state. Therefore, in this paper, the temperature change of the battery surface during the thermal runaway process at the 0.5C rate is studied, four different temperature rise calculation intervals, such as 1s, 10s, 30s, and 60s, are set, and four different curves of temperature rise versus time of the battery are obtained. The value of the temperature rise inflection point before the thermal runaway of the battery obtained at different temperature rise calculation intervals is analyzed, and it is considered that the temperature rise data obtained at the temperature rise interval of the 30s under the experimental conditions set in this paper can be used as an effective monitoring parameter for the thermal runaway of the battery.