【摘要】 磷酸铁锂电池被广泛应用于电化学储能及新能源汽车领域，然而，由于锂电池内部化学物质的可燃性，在滥用条件下有可能导致火灾事故的发生。针对磷酸铁锂电池，开展了电芯及电池模组级别的火灾实验，结果表明：电芯热失控产生喷射火，峰值温度超过1 300℃，辐射热流达30.9 kW/m~2，可点燃常见可燃物；电池模组内热失控以热传导为主，相邻电芯组传播间隔约900 s，导致整体火灾持续超过1 h，并呈现间歇性喷射、熄灭与复燃循环。上述长时程、级联式燃烧机理揭示了磷酸铁锂电池火灾反复延续的根本原因，对电池模组的隔热设计、分仓防护以及消防持续冷却策略具有重要参考价值。更多还原

【Abstract】 Lithium iron phosphate batteries are widely used in electrochemical energy storage and new energy vehicle applications. However, due to the flammability of the internal chemical components, these batteries can potentially lead to fire incidents under abuse conditions. This study conducted fire experiments on Lithium iron phosphate batteries at both the individual cell and module levels. The results reveal that LFP cells generate jet fires characterized by high temperatures and intense radiant heat, which readily contribute to fire spread. The combustion behavior of Lithium iron phosphate battery modules stems from the sequential thermal runaway of individual cells within the module, manifesting as intermittent jet fires. The findings provide valuable references for fire suppression strategies targeting lithium battery fires and the design of passive fire protection measures.更多还原