BATTERY MODULE FOR PREVENTING THERMAL RUNAWAY SPREADING

Disclosed is a battery module for preventing thermal runaway spreading, comprising: a cell holder; a battery pack, including a plurality of cells; a metal plate, disposed with the cell holder to collaboratively form multiple compartments, with adjacent compartments separated by the extruding separators; a fire-retardant expandable member, disposed within the compartment; and an upper cover, disposed on the cell holder with a intermediate space between the upper cover and the cell holder. The cell holder includes pressure relief openings for the compartments, allowing high-temperature substances released by cells undergoing thermal runaway to pass through the compartments, the pressure relief openings, the intermediate space, and the vent openings in the metal plate to the outside. This allows the pressure to be relieved first, followed by preventing oxygen from fueling the fire, thereby avoiding flames and sparks spreading out of the chassis, and ensuring the safety of surrounding personnel and devices.