EVALUATION METHOD OF LEAK RESISTANCE PERFORMANCE OF CELL SEPARATOR UNWOVEN FABRIC

摘要

PROBLEM TO BE SOLVED: To provide an evaluation method of leak resistance performance of a cell separator unwoven fabric capable of easily evaluating leak resistance performance in a group winding operation using a battery forming machine.SOLUTION: The evaluation method of leak resistance performance of a cell separator unwoven fabric includes the steps of: preparing a test piece of a separator which is cut in a predetermined width confirming to JIS P 8113; setting one end of the test piece to an upper chuck of a tensile strength tester and the other end of the test piece to a lower chuck thereof together with an L-shaped steel of 3 mm in thickness and 7 mm smaller than the separator in a width; and measuring the tensile strength and the elongation using the tensile strength tester.