Patent ID: 7488546
Filing Date: 2009-02-10
Classification: A62C,H01M,Y02E

Abstract:
1. A medium- or large-sized battery pack having a plurality of unit cells, the battery pack comprising safety device disposed within the battery pack outside the unit cells, the safety device including: a sealed container containing perfluoroketone; as a fire extinguishing agent, the sealed container capable of being broken due to an increase of vapor pressure caused by evaporation of the perfluoroketone to eject the evaporated perfluoroketone, when the temperature of the battery pack is increased, wherein the sealed container comprises a hollow housing opened at one end thereof, and a cover member mounted to the open end of the housing, the cover member capable of being broken or detached by the increase of vapor pressure to eject the evaporated perfluoroketone.