Patent ID: 7976977
Filing Date: 2011-07-12
Classification: H01M,Y02E,Y02P

Abstract:
1. A stacked and folded electrochemical device comprising: multi-stacked unit cells of full cells or bicells; and a separation film interposed between the stacked unit cells and wrapping the stacked unit cells in a folding direction, wherein separators of the unit cells are formed of a porous material having a low-thermal shrinkage rate, and the separators exhibit no thermal shrinkage until at least 150° C.; and the separation film is formed of a porous material having a relatively high-thermal shrinkage rate, and the separation film exerts shutdown functions by thermal behavior thereof at a temperature of 100 to 150° C., and the separation film is formed of a porous material uniaxially oriented in the folding direction, such that thermal shrinkage takes place only in the folding direction.