METHOD OF MEASURING FUEL CELL STACK IMPEDANCE AND APPARATUS PERFROMING THE SAME

摘要

An apparatus for measuring fuel cell stack impedance according to one embodiment of the present invention comprises: a module voltage measurement unit which measures voltage of a module containing a specific number of cells among cells of a fuel cell stack; a resistance which controls the level of signal currents by means of a specific resistance value; a switch which generates an alternating current component to the signal currents by being changed to ON or OFF state by a specific frequency; and a controller which calculates currents of the fuel cell stack by using the signal current and calculates an impedance of the module by using voltage of the module. Therefore, the present invention can confirm an impedance according to a change of the humidification amount easier than a measurement of the entire voltage of a fuel cell stack by measuring voltage of a specific number of cells among cells of the fuel cell stack.