Technological watch

Disclosed is a Li-ion battery module for preventing thermal runaway spreading, used in a chassis, comprising: a battery pack, including a plurality of cells; a thermally conductive plastic component having a plurality of openings; a separating plate, wherein an air flow path is formed between the separating plate and the chassis, and a plurality of vent holes of the separating plate are connected with the air flow path; a flame-retardant expandable member disposed between the thermally conductive plastic component and the separating plate; and a flow-limiting member, having a circuitous flow path so that high-temperature substances released by the cells in thermal runaway will pass through the openings, causing the flame-retardant expandable member to expand and block the opening, thereby preventing flames and sparks from spreading to the exterior of the chassis, and ensuring the safety of surrounding equipment and personnel.