Determination method and fuel cell system

Abstract

The present invention relates to a determination method (200) for determining a crossover rate (CR) of at least one fuel cell (10) of a fuel cell system (100) for regulation of the fuel cell system (100), the determination method (200) having the following method steps: detecting (202) fill levels (F) of water (W) in a moisture separator (20) of the fuel cell system (100) by means of a fill level detection device (24), draining (204) water (W) out of the moisture separator (20) using a drainage device (22) of the moisture separator (20), measuring (206) a first time (t1) during drainage (204) between a first fill level (F1) and at least a second fill level (F2) of the water (W) in the moisture separator (20), determining (208) the crossover rate (CR) of the at least one fuel cell (10) from the measured first time (t1) and the at least two measured fill levels (F1, F2) by means of a computer unit (30) of the fuel cell system (100), wherein the crossover rate (CR) corresponds to a transition rate of water (W) from a cathode side (K) of the at least one fuel cell (10) to the anode side (A) of the at least one fuel cell (10). The invention also relates to a fuel cell system (100) having a plurality of fuel cells (10), a moisture separator (20), a drainage device (22), a fill level detection device (24), and a computer unit (30).

Dependencies are inferred from the claim text.