Studies on the prevention of thermal propagation with nonflammable pad in Li-ion battery

In this study, a research was conducted on the delay and prevention of thermal propagation caused by single cell thermal runaway by applying non-combustible materials. In the case of a cylindrical shape, since the venting opening is fixed, an exothermic reaction proceeds through a lot of air inflow at the moment of thermal runaway. The fire retardation effect due to extinguishing by suffocation was demonstrated by applying a non-flammable material and a material containing expanded graphite to prevent transition from occurring by blocking the inflow of ambient air at the moment of thermal runaway, ending in single cell thermal runaway. It is thought that various materials for this delay after the occurrence of thermal runaway could be approached, but in order to end single cell thermal runaway, it is important to apply a material capable of an effective suffocation effect. •Preventing thermal runaway in batteries•Development of fire-spread prevention pad•Extinguish flames during thermal runaway by smothering and blocking heat transfer