布置方向对三元锂电池热失控及其传播行为的影响OA

Lithium-ion battery energy storage technology is one of the key enablers driving modern electrification.However,thermal runaway and its propagation pose significant safety challenges for large-scale energy storage systems.During thermal runaway,the battery's pressure relief valve opens,releasing a large volume of electrolyte vapor and high-temperature flammable gases.The im-pact of dif-ferent battery orientations on the ejection behavior during thermal runaway and its influ-ence on thermal runaway propagation in battery modules remains unclear.This study investigates the thermal runaway and propagation behaviors of NCA103450 lithium-ion cells and modules under three orientations of safety valve placement:upward,downward,and horizontal.The results indicate that for single cells,a higher state of charge leads to a higher maximum thermal runaway tempera-ture and a shorter thermal runaway initia-tion time.While battery orientation has minimal impact on the thermal runaway behavior of single cells,in modules,the thermal runaway initiation time fol-lows the trend:upward-facing safety valve>horizontal>downward-facing safety valve,indicating that thermal runaway propagates most slowly with an upward-facing valve and most rapidly with a downward-facing valve.The orientation of the safety valve has a relatively minor effect on the mass loss during thermal runaway in battery modules.This study deepens the understanding of ejection,thermal runaway,and propagation behaviors in lithium-ion batteries,providing theoretical guidance for the safe design of battery modules and transportation.