Abstract: A bipolar plate (100) for a fuel cell includes at least one profiled flow field (120) with at least two flow field channels (121, 122, 123, 124) and an associated inlet channel (111, 112, 113, 114) and an associated outlet channel (131, 132, 133, 134) for each of the flow field channels (121, 122, 123, 124). Here, different inlet channels (111, 112, 113, 114) are of different lengths, and different outlet channels (131, 132, 133, 134) are of different lengths. The bipolar plate (100) is characterized in that the inlet channels and/or the outlet channels (131, 132, 133, 134) are dimensioned in such a way that the pressure loss is equal via each channel which is composed of one of the flow field channels (121, 122, 123, 124), the associated inlet channel (111, 112, 113, 114) and the associated outlet channel (131, 132, 133, 134), as long as a predefined mass flow change takes place in each of the flow field channels (121, 122, 123, 124).

Abstract: The invention relates to a bipolar plate (1) for a fuel cell (100) comprising a profiled anode plate (7) and a profiled cathode plate (8), each having an active region (6) as well as two distributor regions (2) for supply and discharge of operating media to or from the active region (6), wherein the distributor regions (2) each have one main anode gas port (3) for supply and discharge of fuel, one main cathode gas port (4) for supply and discharge of oxidizer, which is arranged in such a manner that cathode channels (41) extending therefrom run straight, at least across the distributor region (2) of the bipolar plate (1), and have a flow direction that corresponds to a main flow direction in the cathode channels (41) in the active region, as well as a main coolant port (5) for the supply and discharge of coolant.

Abstract: The invention relates to a fuel cell (10) having a stack comprising a bipolar plate (20) which has a flow field (22) formed by a profiled section of the bipolar plate (20), and an elongated sealing element (21) which at least partially surrounds the flow field (22), and a membrane electrode assembly (30). It is provided that, inside a cavity (25) formed between the membrane electrode assembly (30) and the bipolar plate (20) in a region between the sealing element (21) and the flow field (22), a filling agent (24) is arranged which extends in the extension direction of the cavity (25).

Abstract: The invention concerns a fuel cell (100), comprising a stack (1) of alternating bipolar plates (113) and membrane electrode assemblies (114) as well as flow channels (104, 105) that are designed between a bipolar plate (113) and a membrane electrode assembly (114) and flow channels (104, 105) that are designed within a bipolar plate (113) as well as a motor vehicle with such a fuel cell. Provision is made that a surface (101) of at least a part of the flow channels (104, 105) that is overflowable by a fluid has, regarding its direction of extension at least in part a hydrophobic segment (101a) and a hydrophilic segment (101b) with regard to a cross-section of the flow channel (104, 105).

Abstract: A membrane for a membrane electrode assembly of a fuel cell has a quadrangular shape with two parallel longitudinal sides and two opposite short sides. The membrane can be produced by providing an endless membrane, wherein edges of the endless membrane form the longitudinal sides of the membrane, and processing the endless membrane by making two cuts: a first cut at a first angle to an extension direction and forming a first cut edge, and a second cut at a second angle to the extension direction and forming a second cut edge. The first cut edge and the second cut edge form the short sides of the membrane and at least one of the first and second angles are different from 90°. At least one angle enclosed by one of the short sides and an adjacent longitudinal side is different from 90°.

Abstract: The invention relates to a membrane (30) for a membrane electrode assembly of a fuel cell having a quadrangular shape with two parallel longitudinal sides (38) and two opposite short sides (32), that can be produced by the following steps in the order given: Providing an endless membrane (39), wherein the edges of the endless membrane (39) form the longitudinal sides (31) of the membrane (30), and Processing the endless membrane (30) by two cuts, a.) a first cut, which is executed at a first angle (?) to the extension direction and forms a first cut edge (34), and b.) a second cut, which is executed at a second angle (?) to the direction of extension and forms a second cut edge (35), wherein the first cut edge (34) and the second cut edge (35) form the short sides (32) of the membrane (30) and the first and/or the second angle (?, ?) is different from 90°. It is provided that at least one angle (?) enclosed by a short side (32) and an adjacent longitudinal side (31) is different from 90°.

Abstract: The invention relates to a bipolar plate (1) for a fuel cell (100) comprising a profiled anode plate (7) and a profiled cathode plate (8), each having an active region (6) as well as two distributor regions (2) for supply and discharge of operating media to or from the active region (6), wherein the distributor regions (2) each have one main anode gas port (3) for supply and discharge of fuel, one main cathode gas port (4) for supply and discharge of oxidizer, which is arranged in such a manner that cathode channels (41) extending therefrom run straight, at least across the distributor region (2) of the bipolar plate (1), and have a flow direction that corresponds to a main flow direction in the cathode channels (41) in the active region, as well as a main coolant port (5) for the supply and discharge of coolant.

Abstract: A fuel cell system (100), which includes multiple fuel cell stacks (10, 20) having a pair of adjacent fuel cell stacks (10, 20), namely a first fuel cell stack (10) and a second fuel cell stack (20), each including multiple fuel cells (2), as well as multiple main channels (11, 12, 13) which penetrate the fuel cell stacks (10, 20) for distributing the operating agents to the individual fuel cells (2) is provided. It is provided that the fuel cell stacks (10, 20) of one pair are situated in such a way that a sequence of the main channels (11, 12, 13) is mirror-symmetrical to a plane running between the adjacent fuel cell stacks (10, 20) of the pair, with respect to the different operating agents.

Abstract: A bipolar plate for a fuel cell, including a profiled anode plate and a profiled cathode plate, each having an active region and two distribution regions for feeding and discharging operating media to and from the active region, and each distribution region having a main anode-gas port for supplying and evacuating fuel, a main cathode-gas port for supplying and evacuating oxidant and a main coolant port for supplying and evacuating coolant, the ports being arranged along a lateral edge of the bipolar plate. The plates are stacked so that the bipolar plate has channels interconnecting the main operating media ports of both distribution regions, and the distribution regions have at least one overlapping section, in which the channels overlap such that they do not form fluidic connections. A fuel cell is also provided.

Abstract: A bipolar plate (10) for a fuel cell, including a first half plate (20) having a first thickness (21) and a second half plate (30) having a second thickness (31), the first half plate (20) and the second half plate (30) each being situated with one of their flat sides facing one another, and the first half plate (20) forming a first flow field (22) on its outer side for a first operating medium and the second half plate (30) forming a second flow field (32) on its outer side for a second operating medium is provided. It is provided that the first thickness (21) of the first half plate (20) is on average smaller, at least in sections, than the second thickness (31) of the second half plate (30).

Abstract: The invention relates to a fuel cell (10) having a stack comprising a bipolar plate (20) which has a flow field (22) formed by a profiled section of the bipolar plate (20), and an elongated sealing element (21) which at least partially surrounds the flow field (22), and a membrane electrode assembly (30). It is provided that, inside a cavity (25) formed between the membrane electrode assembly (30) and the bipolar plate (20) in a region between the sealing element (21) and the flow field (22), a filling agent (24) is arranged which extends in the extension direction of the cavity (25).

Abstract: The invention concerns a fuel cell (100), comprising a stack (1) of alternating bipolar plates (113) and membrane electrode assemblies (114) as well as flow channels (104, 105) that are designed between a bipolar plate (113) and a membrane electrode assembly (114) and flow channels (104, 105) that are designed within a bipolar plate (113) as well as a motor vehicle with such a fuel cell. Provision is made that a surface (101) of at least a part of the flow channels (104, 105) that is overflowable by a fluid has, regarding its direction of extension at least in part a hydrophobic segment (101a) and a hydrophilic segment (101b) with regard to a cross-section of the flow channel (104, 105).

Abstract: A bipolar plate for a fuel cell, including a profiled anode plate and a profiled cathode plate, each having an active region and two distribution regions for feeding and discharging operating media to and from the active region, and each distribution region having a main anode-gas port for supplying and evacuating fuel, a main cathode-gas port for supplying and evacuating oxidant and a main coolant port for supplying and evacuating coolant, the ports being arranged along a lateral edge of the bipolar plate. The plates are stacked so that the bipolar plate has channels interconnecting the main operating media ports of both distribution regions, and the distribution regions have at least one overlapping section, in which the channels overlap such that they do not form fluidic connections. A fuel cell is also provided.

Abstract: A bipolar plate (100) for a fuel cell includes at least one profiled flow field (120) with at least two flow field channels (121, 122, 123, 124) and an associated inlet channel (111, 112, 113, 114) and an associated outlet channel (131, 132, 133, 134) for each of the flow field channels (121, 122, 123, 124). Here, different inlet channels (111, 112, 113, 114) are of different lengths, and different outlet channels (131, 132, 133, 134) are of different lengths. The bipolar plate (100) is characterized in that the inlet channels and/or the outlet channels (131, 132, 133, 134) are dimensioned in such a way that the pressure loss is equal via each channel which is composed of one of the flow field channels (121, 122, 123, 124), the associated inlet channel (111, 112, 113, 114) and the associated outlet channel (131, 132, 133, 134), as long as a predefined mass flow change takes place in each of the flow field channels (121, 122, 123, 124).

Abstract: A bipolar plate (10) for a fuel cell, including a first half plate (20) having a first thickness (21) and a second half plate (30) having a second thickness (31), the first half plate (20) and the second half plate (30) each being situated with one of their flat sides facing one another, and the first half plate (20) forming a first flow field (22) on its outer side for a first operating medium and the second half plate (30) forming a second flow field (32) on its outer side for a second operating medium is provided. It is provided that the first thickness (21) of the first half plate (20) is on average smaller, at least in sections, than the second thickness (31) of the second half plate (30).

Abstract: A fuel cell system (100), which includes multiple fuel cell stacks (10, 20) having a pair of adjacent fuel cell stacks (10, 20), namely a first fuel cell stack (10) and a second fuel cell stack (20), each including multiple fuel cells (2), as well as multiple main channels (11, 12, 13) which penetrate the fuel cell stacks (10, 20) for distributing the operating agents to the individual fuel cells (2) is provided. It is provided that the fuel cell stacks (10, 20) of one pair are situated in such a way that a sequence of the main channels (11, 12, 13) is mirror-symmetrical to a plane running between the adjacent fuel cell stacks (10, 20) of the pair, with respect to the different operating agents.