Patent ID: 8574743

Claim:
A stacked and folded electrochemical device comprising: multi-stacked unit cells of full cells or bicells; a separation film interposed between the stacked unit cells, and wrapping the stacked unit cells in a folding direction; and separators comprising a ceramic material or an engineering plastic, each having a melting point of more than 200° C. the ceramic material coated on a supporting material in each unit cell, the supporting material made of porous non-woven films or a polyolefin separator, wherein the separators of the unit cells are formed of a porous material, wherein the ceramic material or the engineering plastic has a low-thermal shrinkage rate, so that the separator exhibits no thermal shrinkage until at least 150° C., wherein the separation film is formed of a porous material having a relatively high-thermal shrinkage rate, the separation film made of a polyolefin resin, or a copolymer or blend thereof, and wherein the separation film exerts shutdown functions by thermal behavior thereof at a temperature of 100 to 150° C.