Audi Ag

Volkswagen Ag

Matej Kusy

Ian Stewart

Brian Walter Dickson

Alexander Leung

Tegan Harrower

Sabina Russell

Thomas Harrower

The present invention relates to a method for determining the compressive tensile force acting on a fuel cell stack due to at least one tensioning element. Thereby, the compressive tensile force is the overall tensile force compressing the fuel cell stack. This is determined according to the invention by means of acoustic measurements on vibratable sections of the tensioning elements. The subject matter of the invention also includes a data processing program for carrying out the method according to the invention along with the use of a smartphone for carrying out the method according to the invention.

Method for determining the compressive tensile force acting on a fuel cell stack

The invention relates to a method for producing a catalyst coated membrane () for a fuel cell (), wherein the catalyst coated membrane () has a membrane () and a catalyst layer () of a catalytic material arranged on at least one of its flat sides, as well as a nonrectangular active area (), which is restricted in one direction by two outer sides () opposite one another. The method comprises a continuous application of the catalytic material to a membrane material () while creating a constant coating width (B) such that an area () coated with the catalytic material corresponds to at least the active area (). A provision is that the membrane material () be coated with the catalytic material such that a coating direction (D) has an angle with respect to the opposite outer sides () of the active area () that is not equal to 90&#xb0; and not equal to 0&#xb0;.

Method for producing a catalytically coated membrane and membrane electrode assembly and fuel cell stack having same

The invention relates to a bipolar plate () for a fuel cell (), comprising&#x2014;an internal coolant flow field (), which comprises a coolant channel (), and&#x2014;a first and a second flat side () with a first and second reactant flow field () respectively, which has at least one first and second channel structure () respectively, wherein&#x2014;the first and the second channel structure () each form a trunk channel () and branch channels (), wherein the branch channels () branch off in a branching region () from the respective trunk channel (), and a first intermediate region () is formed between the branch channels () of the first channel structure (), and a second intermediate region () is formed between the branch channels () of the second channel structure (), wherein normal projections of the first and second intermediate region () onto a center plane () of the bipolar plate (), which center plane is arranged between the two flat sides () of the bipolar plate (), partially overlap so that an overlapping region () is formed. It is provided that the coolant channel () extends from an outer region (), which is located outside the first and second intermediate region (), into the overlapping region (), crossing a transit region () in the process, wherein the transit region () is a subregion of the normal projection of the first intermediate region () onto the center plane, which projects from the overlapping region ().

Bipolar plate and fuel cell comprising a bipolar plate of this type

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Burnaby, Canada

Matej Kusy