Abstract: Thermal runaway safety is a bottleneck restricting the development of lithium-ion battery energy storage technology. The thermal barrier is one of the technical ways to restrain the thermal runaway spread of batteries. In this paper, the 55 Ah lithium iron phosphate energy storage battery module was used to study the influence of different thicknesses of aerogel mat on the thermal runaway spreading characteristics of the lithium iron phosphate battery module. The results showed that aerogel mat could effectively inhibit the thermal runaway spread of lithium iron phosphate battery. The thicker the aerogel blanket was, the better the thermal barrier effect was. The 0.5, 1.2, 3.0 mm aerogel blankets could improve the thermal barrier efficiency of the battery module by 75.80%, 88.81%, and 299.92%, respectively. The results provided a reference for the prevention and control of thermal runaway of lithium-ion batteries.

Key words: lithium-ion batteries, lithium iron phosphate barreries, aerogel blanket, heat spread, thermal runaway