Abstract: The invention relates to a plate-type component, in particular a separator plate, cathode end plate, anode end plate, half-shell of a separator-, cathode-end-, or anode-end plate or frame for holding a membrane electrode assembly, for a fuel cell stack, wherein a surface of the plate-type component has at least three adjacent regions, forming at least parts of a position marking, and respective neighbouring ones of the at least three adjacent regions are designed in such a way that, when viewing the surface along a predefined direction, the respective neighbouring regions have different average reflectivities at least in the visible region.

Abstract: The invention relates to an air supply device for fuel cell systems with a flow compressor and an electric drive motor for the flow compressor, wherein the flow compressor has two compressor wheels which are essentially symmetrical and which are arranged, together with the electric drive motor there between, on a common shaft. The air supply device according to the invention is characterized in that the two compressor wheels are connected on the pressure side to two systems which are pneumatically not permanently connected. A fuel cell system which uses such an air supply device is also claimed.

Abstract: The invention relates to manufacturing method for components of a fuel cell stack from a mixture of plastic and at least one electrically conductive filler by means of a double belt press. The manufacturing method according to the invention is characterized in that an uncured or incompletely cured strip-shaped blank comprising the mixture is fed into an isochoric double belt press having individual segments, wherein each of the individual segments has a shaping structure for shaping the blank into the component as the blank passes through the double belt press, wherein the individual segments on the two belts of the double belt press position themselves relative to one another during the pressing process by means of corresponding locking elements. The invention further relates to a manufacturing method for bipolar plates and/or interface plates, the halves of which are manufactured according to the above method and are bonded to one another in an isobaric double belt press.

Abstract: The invention relates to a compressed gas storage tank, in particular for a motor vehicle, with a holder that is designed to store a compressed fuel, and with at least one pressure relief valve. Fuel is dischargeable from the holder into environment of the compressed gas tank due to the opening of at least one pressure relief valve. A catalytic converter device of the compressed gas storage tank is designed to catalyze an oxidation reaction of fuel originating from the holder with oxygen. The compressed gas storage tank has at least one piezoelectric element to which a pressure can be applied by opening the at least one pressure relief valve. Through the pressure, at least one spark can be generated by means of the at least one piezoelectric element. The invention furthermore relates to a method for operating a compressed gas storage tank of said type.

Abstract: The invention relates to a fuel cell system with at least one fuel cell stack, which comprises an anode chamber and a cathode chamber, with at least one air conveying device for the supply of the cathode chamber with air via a feed air line, with an outlet air line from the cathode chamber, with at least one fuel supply device for the supply of the anode chamber with fuel, with at least one anode circuit for the recirculation of unused fuel around the anode chamber, furthermore with a cathode bypass.

Abstract: The invention relates to a bipolar plate for a fuel cell made of two plate halves with mutually facing surfaces and aligning elements in the region of said surfaces, which have elevations with a height and corresponding depressions with a depth. The invention is characterized in that all of the elevations and corresponding depressions have a greater extension in the longitudinal direction than in the transversal direction, wherein four of the corresponding parts of the aligning elements are arranged on each of the surfaces, two respective parts of the parts lying on a common straight line and having the same orientation.

Abstract: A separator plate (1) for media guiding in a fuel cell, with at least one through-opening (2, 3, 4, 5, 6, 7) for supplying and at least one through-opening (2, 3, 4, 5, 6, 7) for discharging a medium, with a channel structure (12) for uniformly guiding the medium, as well as with distribution regions (9) which connect the through-openings (2, 3, 4, 5, 6, 7) with the channel structure (12). At least one of the distribution regions (9) surrounds at least one of the through-openings (2, 3, 4, 5, 6, 7) associated with it around the entire perimeter.

Abstract: The invention relates to a fuel cell stack with a plurality of individual cells, wherein the individual cells have a common cathode region and a common anode region that is separate from the common cathode region. The fuel cell stack according to the invention is characterized in that at least one valve device is integrated for blocking the flow path into the cathode region and/or out of the cathode region.

Abstract: The invention relates to a device for electrically connecting at least one fuel cell stack and at least one high-voltage battery for supplying electrical energy to consumers which are connected on the side of the high-voltage-battery. The invention is characterized in that the fuel cell stack and the high-voltage battery are connected to one another via at least one diode, which blocks current flow in the direction of the fuel cell stack, and at least one switch for closing and breaking the connection. According to the method, the switch is controlled depending on the voltages of firstly the at least one fuel cell stack and secondly the at least one high-voltage battery.

Abstract: The invention relates to a method for coating bipolar plates. It is characterized by at least the following method steps: applying an epoxy resin-carbon mixture at least to regions of at least one side that is to be coated of a bipolar plate; placing a die onto the side coated with epoxy resin-carbon mixture of the bipolar plate and fixing the die relative to the bipolar plate with a fixed distance between bipolar plate and die; curing the epoxy resin-carbon mixture and removing the die; roughening at least regions of the cured epoxy resin-carbon mixture coating; hydrophilizing at least the roughened regions of the epoxy resin-carbon mixture coating by exposing at least the roughened regions to a low-pressure plasma.

Abstract: The invention relates to a fuel cell facility (1) having two parallel fuel cell systems (13, 14), each of which comprises at least one fuel cell stack (15, 16, 17, 18) having anode-side and cathode-side periphery, and having a common air conveying device (2), The fuel cell facility (1) according to the invention is characterized in that the air conveying device (2) is designed in two stages, wherein both stages are designed in the form of flow compressors (3, 4) which each have one compressor wheel (8, 9, 10, 11) per stage, wherein the compressor wheels (8, 9; 10, 11) for the one and the other fuel cell system (13; 14) are arranged symmetrically to at least one electrical machine (5, 6) on a shaft (7).

Abstract: The invention relates to manufacturing method for components of a fuel cell stack from a mixture of plastic and at least one electrically conductive filler by means of a double belt press (1, 14). The manufacturing method according to the invention is characterized in that an uncured or incompletely cured strip-shaped blank (2) comprising the mixture is fed into an isochoric double belt press (1) having individual segments (4), wherein each of the individual segments (4) has a shaping structure for shaping the blank into the component as the blank passes through the double belt press (1), wherein the individual segments (4) on the two belts (3) of the double belt press (1) position themselves relative to one another during the pressing process by means of corresponding locking elements (13).

Abstract: The invention relates to a device (10) for supplying air to a fuel cell (3), having at least one air conveying device (11) and at least one humidifying device, which supplies condensed product water from the fuel cell (3) to the compressed supply air flow by means of at least one nozzle (171-178). It is characterized in that a field (15) of two-substance nozzles (171-178) for the supply of water is formed in the flow cross section of the supply air flow, wherein a separated cross section (161-168) through which flow can take place is formed for each of the two-substance nozzles (171-178) and wherein each of the separated cross sections (161-168) through which flow can take place comprises a valve (22) having a valve seat (24) and a valve body (23), which is pressed counter to the flow by a restoring force in the direction of the valve seat (24).

Abstract: The invention relates to an apparatus for monitoring the cell voltage of an individual cell (3), formed by a membrane electrode assembly (4) and bipolar plates (6), of a fuel cell stack (1), the apparatus having a measuring device (7) for each of the individual cells (3), which measuring device comprises an optical signal generator (9) which is controllable by the measuring device. The apparatus according to the invention is characterized in that the measuring device (7) is formed on a flexible circuit board that is connected to a frame (5) of a framed membrane electrode assembly (4, 5) or is formed as part of the frame.

Abstract: The invention relates to a flow field plate (1) for a fuel cell, consisting of a synthetic resin (A-B) with fillers that comprise at least graphite (C) and/or carbon black. The flow field plate (1) according to the invention is characterized in that a polyurethane resin (PUR) is used as the synthetic resin (A-B).

Abstract: The invention relates to a compressed gas storage tank, in particular for a motor vehicle, with a holder that is designed to store a compressed fuel, and with at least one pressure relief valve. Fuel is dischargeable from the holder into environment of the compressed gas tank due to the opening of at least one pressure relief valve. A catalytic converter device of the compressed gas storage tank designed to catalyze an oxidation reaction of fuel originating from the holder with oxygen. The compressed gas storage tank has at least one piezoelectric element to which a pressure can be applied by opening the at least one pressure relief valve Through the pressure, at least one spark can be generated by means of the at least one piezoelectric element. The invention furthermore relates to a method for operating a compressed gas storage tank of said type.

Abstract: The invention relates to a fuel cell stack having a variety of individual cells stacked up to form a stack, having at least one humidifier section integrated into the stack and arranged at one end of the individual cells as an electrochemical section. The invention is characterized in that a heat exchanger section is arranged on the side of the at least one humidifier section facing away from the electrochemical section, wherein flow plates for distributing fluids in at least three sections of the stack have the same external geometry.

Abstract: The invention relates to a fuel cell system (2) with at least one fuel cell stack (19), which comprises an anode chamber (20) and a cathode chamber (21), with at least one air conveying device (3) for the supply of the cathode chamber (21) with air via a feed air line (22), with an outlet air line (23) from the cathode chamber (21), with at least one fuel supply device (26) for the supply of the anode chamber (20) with fuel, with at least one anode circuit (28) for the recirculation of unused fuel around the anode chamber (20), furthermore with a cathode bypass (37).

Abstract: The invention relates to an air supply device (1) for fuel cell systems (2, 3) with a flow compressor and an electric drive motor (4) for the flow compressor, wherein the flow compressor has two compressor wheels (6, 7) which are essentially symmetrical and which are arranged, together with the electric drive motor (4) there between, on a common shaft (5). The air supply device according to the invention is characterized in that the two compressor wheels (6, 7) are connected on the pressure side to two systems (2, 3, 10, 13) which are pneumatically not permanently connected. A fuel cell system (2, 3) which uses such an air supply device (1) is also claimed.

Abstract: A separator plate (1) for media guiding in a fuel cell, with at least one through-opening (2, 3, 4, 5, 6, 7) for supplying and at least one through-opening (2, 3, 4, 5, 6, 7) for discharging a medium, with a channel structure (12) for uniformly guiding the medium, as well as with distribution regions (9) which connect the through-openings (2, 3, 4, 5, 6, 7) with the channel structure (12). At least one of the distribution regions (9) surrounds at least one of the through-openings (2, 3, 4, 5, 6, 7) associated with it around the entire perimeter.