the present invention discloses an insulating ring for a lithium ion battery , comprising : a circular ring body ; a core rod positioning member configured at a central part of the circular ring body for positioning a core rod of the lithium ion 5 battery ; and at least a tab hole configured to be adjacent to the core rod positioning member through which a tab of the core rod is penetratable . further , a lithium ion battery having the insulating ring is also disclosed . with the present invention , battery safety performance is enhanced greatly .