Objective To analyze the explosion hazard of gases produced after the thermal runaway of lithium batteries and to explore the relationship between the lower explosive limit of gases and influencing factors, thereby establishing a research foundation for improving the safety management of lithium battery electrochemical energy storage technology.mental study was conducted on the two key factors of hydrogen concentration and temperature in the gases produced after thermal runaway. The correlation between the lower explosive limit and influencing factors was analyzed.

Methods By analyzing the influencing factors of the lower explosive limit of gases after lithium battery thermal runaway,an experimental study was conducted on the two key factors of hydrogen concentration and temperature in the gases produced after thermal runaway. The correlation between the lower explosive limit and influencing factors was analyzed.

Results When the hydrogen concentration in the gases produced after lithium battery thermal runaway ranged from approximately 40% to 75%, the lower explosive limit gradually decreased from 6.6% to 4.8% as the hydrogen concentration increased. The linear relationship between hydrogen concentration and the lower explosive limit was characterized by the equation y = -0.051 x + 8.612, with a correlation coefficient of 0.998. For gas samples with a hydrogen concentration of about 50%, the lower explosive limit gradually decreased from 6.0% to 3.6% as the temperature rose from 30 ℃ to 250 ℃. The characteristic curve was y = -0.000 06 x² + 0.008 x + 5.805, with a correlation coefficient of 0.969.

Conclusions As the hydrogen concentration increased or the temperature rose, the lower explosive limit of gases produced after lithium battery thermal runaway showed a decreasing trend, displaying a good linear relationship. The lower explosive limit could be predicted through hydrogen concentration and temperature data.