Abstract: In recent years, with the accelerating commercialization process of energy storage power station, the safety and fire protection problems of energy storage power station have attracted much attention. Lithium iron phosphate battery thermal runaway characteristic gas as a detection and early warning method has been widely used in energy storage power station. The diffusion law of gas in energy storage container directly affects the accuracy of detection and early warning. However, the influence of ventilation on the thermal runaway characteristic gas diffusion law of LiFePO4 battery in energy storage container is not well understood. In order to explore the influence of ventilation on the characteristic gas diffusion of energy storage container, the types and components of characteristic gas in 109 Ah lithium iron phosphate battery under thermal runaway were studied by using lithium- ion battery thermal runaway experimental platform, and then the full-scale simulation of gas diffusion in energy storage power station was carried out by using numerical analysis technology. The characteristics were discussed by changing the ventilation rate, ventilation size and ventilation position. The diffusion law of characteristic gas and the change law of longitudinal characteristic gas are given, which provides a certain theoretical basis for real gas detection and early warning.

Key words: Energy storage power station fire protection, fire numerical simulation, lithium iron phosphate battery