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.

Abstract: A tank valve for installation on a compressed gas container has a base body having a shared gas connection for refueling/extraction which is divided inside the base body into a refueling line and an extraction line as part of an extraction path, and has an extraction valve in the extraction line. The tank valve has a check valve disposed in the extraction path in series with the extraction valve, blocking the flow against the flow direction when gas is extracted.

Abstract: A tank valve for installation at a pressure gas tank has a base body including a first base body section, which in the assembled state projects into the pressure gas tank and is sealingly connected with the same, and includes a second base body section, which in the assembled state remains outside the pressure gas tank. The tank valve further has a plurality of functional sub-groups for refueling the pressure gas tank via a refueling path, for the extraction of gas from the pressure gas tank via an extraction path, and for implementing safety and operating functions.

Abstract: A tank valve for installation at a pressure gas tank has a base body including a first base body section, which in the assembled state projects into the pressure gas tank and is sealingly connected with the same, and includes a second base body section, which in the assembled state remains outside the pressure gas tank. The tank valve further has a plurality of functional sub-groups for refueling the pressure gas tank via a refueling path, for the extraction of gas from the pressure gas tank via an extraction path, and for implementing safety and operating functions.

Abstract: The invention relates to a tank valve (4) for mounting on a pressurized-gas container (3), having a main body (5), having multiple functional subassemblies for the refilling of the pressurized-gas accumulator (3), for the removal of gas from the pressurized-gas accumulator (3) and the implementation of safety and operating functions, wherein one of the functional subassemblies is formed as an extraction valve (6), and wherein at least one of the other functional subassemblies is formed as a check valve (14, 17). The tank valve according to the invention is characterized in that both the extraction valve (6) and the at least one check valve (14, 17) have in each case one valve seat carrier (22) with a valve seat (21) and one valve body (19), wherein that part of the valve seat carrier (22) which interacts with the valve body (19) has a sealing lip (23), which projects in an axial direction, as part of the valve seat (21).

Abstract: Valve device (4) for a pressurized gas container (2), having a valve housing and functional elements which are introduced into the valve housing. One of the functional elements is an extraction valve (6) having a valve body (5) that is movable between an open position and a closed position. A manual actuating element (12) is provided for moving the valve body (5) into an at least partially open position.

Abstract: The invention relates to a tank valve (4) for installation at a pressure gas tank (3), having a base body (5), including a first base body section (5.1), which in the assembled state projects into the pressure gas tank (3) and is sealingly connected with the same, and which includes a second base body section (5.2), which in the assembled state remains outside the pressure gas tank (3), further having a plurality of functional sub-groups (9, 11, 12, 13, 14, 16, 17, 22, 23, 26, 27) for refueling the pressure gas tank (3) via a refueling path, for the extraction of gas from the pressure gas tank (3) via an extraction path and for implementing safety and operating functions, at least some of the functional sub-groups (9, 11, 12, 13, 14, 16, 17, 22, 23, 26, 27) at least partially being disposed in the base body (5). The tank valve according to the present invention is characterized by the fact that in the first base body section (5.

Abstract: The invention relates to a tank valve (4) for installation on a compressed gas container (3), having a base body (5), having a shared gas connection (16) for refueling/extraction, which is divided inside the base body (5) into a refueling line (24) and an extraction line (25) as part of an extraction path, and having an extraction valve (9) in the extraction line (25). The tank valve according to the invention is characterized in that a check valve (26) is arranged in the extraction path in series with the extraction valve (9), blocking the flow against the flow direction (A) when gas is extracted.

Abstract: An extraction valve for overpressurized gas flowing from a compressed gas reservoir is disclosed. The extraction valve has a valve seat carrier, including a conical valve seat emerging centrally into an outflow chamber. An extraction piston, which is mobile in its axial direction at least indirectly via an electromagnetic coil, includes a valve body cooperating with the valve seat. An inflow chamber for the pressurized gas is designed totally or partially on the circumference of a central axis of the extraction piston and is connected in the axial direction of the extraction piston against a flow direction of the gas when the extraction piston is in the open position, between the valve seat and the valve body via an intermediate connection with an intermediate volume which includes a connection with the region in which the valve seat and the valve body co-operate.

Abstract: An extraction valve for overpressurized gas flowing from a compressed gas reservoir is disclosed. The extraction valve has a valve seat carrier, including a conical valve seat emerging centrally into an outflow chamber. An extraction piston, which is mobile in its axial direction at least indirectly via an electromagnetic coil, includes a valve body cooperating with the valve seat. An inflow chamber for the pressurized gas is designed totally or partially on the circumference of a central axis of the extraction piston and is connected in the axial direction of the extraction piston against a flow direction of the gas when the extraction piston is in the open position, between the valve seat and the valve body via an intermediate connection with an intermediate volume which includes a connection with the region in which the valve seat and the valve body co-operate.