热失控
短路
放热反应
发热
热点(计算机编程)
锂(药物)
灾难性故障
材料科学
内部加热
热成像
阳极
热的
核工程
电极
电压
电气工程
机械工程
电池(电)
化学
复合材料
光学
工程类
热力学
物理
医学
功率(物理)
有机化学
内分泌学
计算机科学
红外线的
操作系统
物理化学
作者
Qi Wu,Le Yang,Na Li,Yinqiang Chen,Qingsong Wang,Wei‐Li Song,Qi Wu,Yimin Wei,Hao-Sen Chen
标识
DOI:10.1016/j.jpowsour.2022.231602
摘要
The demand for lithium-ion batteries is ever increasing while its safety is arousing great public concerns. The feature of a defective cell that may evolve to catastrophic failure is difficult to characterize, given the observation of the cell's internal structure is hard to make. Herein, this paper proposes a new method using thermography to characterize the evolution process from internal short circuit to thermal runaway inside a lithium-ion cell. The spatial and temporal temperature variation around the initiation point of the internal short circuit as well as the voltage and surface temperature are recorded in high frequency. The internal short circuit is triggered by the magnet and wax. The results show that the aluminum-anode-type internal short circuit can lead to thermal runaway by a sequence of the hot spot, gas generation, and combustion. Inadequate internal short circuit heat generation contributes to a temporary hot spot that gradually cools down to ambient temperature. Thermal runaway tends to occur when the hot spot above 150 °C reaches the area of 50 mm2 and the majority of the exothermic side reaction heat in the hot spot area is released within ca. 2s. These results are expected to guide the design of safer lithium-ion batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI