Audi Ag

Volkswagen Ag

Natalja Ermatschenko

Christian Lucas

Gerold Hübner

Daniel Grundei

A fuel cell stack is provided comprising a plurality of fuel cells comprising a membrane electrode assembly and at least one gas diffusion layer, which fuel cells are divided into at least one first fuel cell segment having a portion of the plurality of fuel cells and a second fuel cell segment having a different portion of the plurality of fuel cells, wherein the first fuel cell segment and the second fuel cell segment are arranged in a common fuel cell cascade, wherein the first fuel cell segment comprises a first collector inlet line for an operating medium and a first collector outlet lined which is formed integrally with a second collector inlet line of the second fuel cell segment and wherein the second fuel cell segment comprises a second collector outlet line. The membrane electrode assemblies and/or the gas diffusion layers inside the second fuel cell segment are designed in such a way that they are more water-repellent than those of the first fuel cell segment. A fuel cell system comprising such a fuel cell stack is also provided.

Cascaded fuel cell stack and fuel cell system

The invention relates to a water separator for separating product water from a fuel cell, a fuel cell including a water separator and a motor vehicle including a fuel cell. To design the water separator to be as compact as possible and to be able to operate it in a frost-proof manner, it is provided according to the invention that the water separator has a sealing element and a riser pipe extending through the sealing element.

Water separator including a riser pipe and a sealing element as well as a fuel cell including a water separator, and a motor vehicle including a fuel cell

The disclosure relates to a fuel cell system comprising a fuel cell stack comprising anode chambers and cathode chambers, an anode supply comprising an anode supply path for supplying an anode operating gas to the anode chambers, and an anode exhaust path for discharging an anode exhaust gas from the anode chambers, and a cathode supply comprising a cathode supply path for supplying a cathode operating gas to the cathode chambers and a cathode exhaust path for discharging a cathode exhaust gas from the cathode chambers, and comprising a negative-pressure generation means for generating a negative pressure in the cathode chambers. It is provided that the negative-pressure generation means is designed as an ejector which is connected to a compressor arranged in the cathode supply path on the pressure input side, and to the cathode chambers of the fuel cell stack on the suction side, in a fluid-conducting manner.

Fuel cell system and method for switching off a fuel cell stack

The invention relates to a fuel cell arrangement () and a motor vehicle having a fuel cell arrangement (). In order to be able to produce the fuel cell arrangement () in a compact manner and to be able to operate said fuel cell arrangement in an efficient manner, it is provided in accordance with the invention that an exhaust gas flow path () of the fuel cell arrangement () extends through a jet pump ().

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Wolfsburg, Germany

Natalja Ermatschenko