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

• Main Authors: HAN, Hee Sik, LEE, Doohee, JANG, Jee Eun, KIM, Yoohan, SHIN, Sung Chul, SONG, Moonkyu, SONG, Nok Jung
• Format: Patent
• Language: English; French; German
• Published: 03.07.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

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 <85pm, respectively, a secondary battery using the same, and a method for preparing the same. The pouch film has excellent sealing strength at ambient temperature and high temperature, as well as excellent sealing strength maintenance characteristics at ambient temperature, and especially excellent sealing strength maintenance characteristics at high temperature.