Lithium-ion　battery　energy　storage　technology　has　emerged　as　the　primary　technological　route　for　the　development　of　new　energy　storage　systems.　However,　frequent　fire　incidents　in　lithium-ion　energy　storage　stations　pose　significant　safety　hazards.　To　analyze　the　patterns　of　gas　generation　of　Lithium-ion　batteries　packs　fire　in　an　energy-storage　cabin　and　to　investigate　the　suppression　effects　of　fine　water　mist　fire　extinguishing　systems　on　this　gas　generation,　the　FDS　software　is　used　to　model　fires　involving　lithium　battery　cells　and　packs　at　a　1:1　scale　in　this　study.　The　gas　generation　patterns　under　different　water　mist　spraying　parameters　during　the　thermal　runaway　of　lithium-ion　batteries　in　an　energy-storage　cabin　is　investigated.　The　results　indicated　that　as　thermal　runaway　intensified　and　the　fire　spread,　the　production　rates　of　CO　and　H₂　gradually　increased,　ultimately　reaching　gas　fractions　of　3.7　%　and　a　concentration　of　23　ppm,　respectively.　The　suppression　efficacy　on　gas　generation　is　positively　correlated　with　the　spray　flow　rate,　spray　cone　angle,　and　nozzle　flow　rate　of　the　fine　water　mist,　while　it　is　negatively　correlated　with　the　droplet　size　of　the　mist.　Additionally,　the　fine　water　mist　system　exhibits　a　significant　suppression　effect　on　gas　generation.　The　research　findings　offer　theoretical　insights　into　the　use　of　fine　water　mist　fire　extinguishing　systems　for　controlling　the　generation　of　fire-induced　gases　and　provide　theoretical　support　for　the　safe　design　of　energy　storage　stations.　©　2025　The　Institution　of　Chemical　Engineers