ELECTROCHEMICAL CELL WITH TWO TYPES OF SEPARATORS

摘要

Provided is an electrochemical device comprising two types of separators having different energy to break, wherein the outermost electrode layer of t he electrode assembly includes an active material non-coated cathode, an active material non-coated anode, and a separator (second separator) disposed betwe en the cathode and anode and having relatively low energy to break compared to that of separators (first separator) in other electrode layers. Therefore, i t is possible to remarkably improve safety of the battery by including primary short-circuiting in the outermost electrode layer of a battery, thus facilitating heat dissipation of the battery, upon application of external impact.