POUCH FILM FOR SECONDARY BATTERY WITH EXCELLENT ROOM TEMPERATURE AND HIGH TEMPERATURE SEALING STRENGTH CHARACTERISTICS IN WHICH TEARING THICKNESS RATIO OR TEARING THICKNESS DIFFERENCE IS CONTROLLED, METHOD FOR PREPARING THE SAME, SECONDARY BATTERY USING THE SAME, AND METHOD FOR MANUFACTURING THE SECONDARY BATTERY

Disclosed is a secondary electrode pouch film comprising at least an outer layer, a barrier layer, and a sealant layer laminated sequentially, wherein the sealant layer thickness T1 and T2 measured according to a tear test method satisfy 0.6 < T1 / T2 < 0.85 or 30pm< T2 - T1