空运状态下锂电池热失控释放气体特性研究

为定量研究空运锂电池热失控危险性并为其批量运输提供理论指导，对不同荷电状态和负压环境下的锂电池开展热失控试验，确定锂电池在不同条件下热失控释放气体的释放特性。利用GC-MS 确定不同荷电状态及负压环境下气体组分，并利用气相色谱仪确定不同条件下锂离子电池热失控释放气体各组分的含量。试验结果表明，在锂电池发生初爆时，不同荷电状态对热失控释放气体量有显著影响，荷电状态在10%及以下时热失控释放气体量较多并且初爆温度较高。不同荷电状态对生成气体中组成成分影响较小，对组分含量影响较大。热失控释放气体量随着负压程度的增加而增大。

Study on the characteristics of thermal runaway gas released from lithium-ion batteries in air transport

In order to study the risk of thermal runaway of lithium battery in air transportation quantitatively and provide theoretical guidance for its mass transportation,thermal runaway experiments were carried out on lithium batteries under different states of charge and negative pressure to determine the gas release characteristics of lithium battery under different conditions. GC-MS was used to determine the gas composition in different SOC and negative pressure environment, and gas chromatograph was used to determine the content of each component of the gas released from the thermal runaway lithium ion battery under different conditions.The experimental results showed that different charge states have significant effect on the amount of gas released when the lithium battery initially exploded. When the state of charge is 10% or less,the amount of gas released from the lithium battery and the initial explosion temperature are higher. Different SOC has little influence on the composition of the gas, but have great influence on the content of the components. The amount of gas increases with the increase of negative pressure.