METHOD FOR LEAK TESTING OF ELECTROCHEMICAL ELEMENTS WHICH HAVE A THIN FLEXIBLE HOUSING THAT IS COMPOSED OF A METAL SHEET OR A METAL/PLASTIC COMPOSITE SHEET

摘要

PURPOSE: Provided is a method of carrying out a leak test in a simple and rapid manner on electrochemical elements which have a thin flexible housing that is composed of a metal sheet or metal/plastic composite sheet, with the check covering leaks, inadequate gas removal and subsequent gas development. CONSTITUTION: The method for leak testing of an electrochemical element comprises the steps of, after assembly and formation of the element in a closed container, subjecting the electrochemical element to an increased pressure and then to a reduced pressure, and measuring any change in thickness that occurs, wherein the increased pressure is between about 1 and about 10 bar, particularly between about 4 and about 8 bar (absolute), wherein the reduced pressure is between about 0 and about 500 mbar (absolute), and wherein the change in thickness is measured by a non-contacting measurement method. The method for leak testing of an electrochemical element comprises the steps of, after assembly, formation and storage of the element in a closed container, subjecting the electrochemical element to a reduced pressure, and measuring change in thickness that occurs, wherein the reduced pressure is between about 0 and about 500 mbar (absolute), and wherein the change in thickness is measured by a non-contacting measurement method.