Electrochemical cell with improved safety

摘要

The present invention provides a sealed electrochemical cell comprising a container containing a spiral-wound electrochemical group and at least one safety device for the event of a rise in internal pressure, wherein said safety device comprises gas vent first means allowing gas to escape to the outside of said container in the event of internal pressure rising, co-operating with holding second means for holding said group inside said container and organized so as to create a gap between said group and the inner wall of said container to allow said gas to flow.