An impedance determining apparatus for use with a fuel cell stack, fuel cell assembly having such an impedance determining apparatus, and methods of determining a impedance of a fuel cell assembly

摘要

The invention relates to a method for determining an impedance of a fuel cell arrangement (20) comprising a first fuel cell stack (12) and a second fuel cell stack (22) and an impedance determination device (10) with an electronic signal generator (30), wherein the first fuel cell stack (12 ) is connected to a first terminal pair (31, 33) of the signal generator (30) and the second fuel cell stack (22) to a second terminal pair (32, 33) of the signal generator (30). The method includes the steps of determining electrical voltages at the two fuel cell stacks (12, 22) and providing associated voltage readings (U1, U2), determining at least one electrical current through one of the two fuel cell stacks (12, 22), and providing at least one associated one Current measurement (I1), and determining an impedance value of the first fuel cell stack (12) and / or the second fuel cell stack (22) in dependence on the voltage measurements (U1, U2) and the at least one current measurement (I1), and alternately Outputting a signal to the first fuel cell stack (12) and the second fuel cell stack (22) for determining the respective impedance value. The invention further relates to a corresponding impedance determination device (10), to a corresponding fuel cell arrangement (20), and to a motor vehicle having a corresponding fuel cell arrangement (20).