The　fire　hazard　resulting　from　the　thermal　runaway　of　lithium-ion　batteries　constitutes　an　severe　threat　for　electric　vehicles,　and　discovering　an　effective　and　prompt　method　for　suppressing　battery　fire　is　still　challenging.　In　this　paper,　a　finite　volume　model　for　simulating　the　process　of　extinguishing　lithium-ion　battery　fire　was　established,　and　the　effect　of　water　mist　on　suppressing　battery　fire　was　studied.　It　was　found　that　the　larger　the　droplet　size,　the　greater　the　initial　spray　velocity,　or　the　higher　the　nozzle　height,　the　worse　the　fire　extinguishing　effect.　The　larger　number　of　nozzles,　the　greater　the　spray　flow,　or　the　earlier　the　spray　start　time,　the　better　the　fire　extinguishing　effect.　As　the　spray　duration　increased,　the　suppression　effect　at　the　center　module　gradually　increased.　When　the　water　mist　nozzle　faced　the　center　point　of　the　module,　the　temperature　rise　was　much　lower　than　at　other　angles,　and　the　fire　extinguishing　performance　was　the　most　effective.