CENTER PIN FOR ELECTROCHEMICAL DEVICE TO IMPROVE SAFETY AND ELECTROCHEMICAL DEVICE COMPRISING THE SAME

摘要

A center pin for an electrochemical device, an electrode assembly using the center pin, and an electrochemical device containing the electrode assembly are provided to improve the safety of an electrochemical device using the center pin in case of abnormal high temperature or overcharge by adding a safety improving material into the empty space of a center pin. A center pin comprises a hollow pipe(10); a first member(20) which comprises a polymer and seals the one end of the hollow pipe; and a second member(30) which comprises a polymer or a metal and seals the other end of the hollow pipe. Preferably the first member or both the first member and the second member are molten at a temperature higher than the normal operation temperature of a device using the center pin, or a voltage more of 4.3 V. Preferably the hollow pipe contains a material capable of improving the safety of a device at the empty space.