Method and device for measuring non-aqueous electrolyte battery moisture

A method for measuring the wettability of an electrolyte solution for a nonaqueous electrolyte battery, and its apparatus are provided to allow the wettability of the injected electrolyte solution to be measured rapidly, easily and precisely. A method for measuring the wettability of an electrolyte solution for a nonaqueous electrolyte battery comprises the steps of packaging an electrode assembly in a case and injecting an electrolyte solution into the case; leaving it alone for a certain time for the infiltration; electrically connecting the measurement terminal of a capacitance measurement device to the positive electrode and negative electrode of the electrode assembly to measure the capacitance between the positive electrode and the negative electrode; and estimating the wettability of an electrolyte solution in the electrode assembly from the measured capacitance.