Siemens Energy Global Gmbh & Co. Kg

Siemens Aktiengesellschaft

Michael Braunecker

Arno Mattejat

Joachim Hoffmann

Torsten Brandt

Walter Stühler

Andreas Reiner

Fabian Straub

Frank Bärnreuther

Torsten Lochner

Stefan Karbacher

A bipolar plate for an electrochemical cell, includes a flow space arranged between a first and a second plate element and has a flow inlet and a flow outlet for a coolant flowing through the flow space. Each plate element has a contact plane for contacting the other plate element and, between the flow inlet and the flow outlet, a plurality of elevations protrude from the contact plane and face away from the other plate element. The elevations have openings facing the contact plane. First flow channels are formed through the openings in the elevations by the elevations of the two plate elements being offset from one another. Each elevation at least partially overlaps at least one elevation of the other plate element. A direction-dependent flow resistance is set in the first flow channels of the bipolar plate.

Fuel cell cooling

A method of examining a fuel cell by means of a cyclic voltammetry analysis, wherein the cyclic voltammetry analysis is used to ascertain a gas composition in the fuel cell. The fuel cell has a first gas space for a first reactant and a second gas space for a second reactant, where no reactant is supplied at least to one of the two gas spaces, especially to either gas space, during the cyclic voltammetry analysis. The cyclic voltammetry analysis is used to ascertain a concentration of hydrogen in the gas spaces.

Method and system for examining a fuel cell by means of a cyclic voltammetric measurement

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Nuremberg, Germany

Michael Braunecker