Abstract: A bipolar plate has a first inlet port and a flow field comprising a plurality of ducts to connect the first inlet port to a first outlet port for a first reactant, and has a second inlet port and a flow field comprising a plurality of ducts to connect the second inlet port to a second outlet port for a second reactant, wherein at least one bypass duct is present at the margin of at least one of the flow fields. The bypass duct is associated with at least one flow connection branching off from the bypass duct into an adjacent marginal duct of the flow field.

Abstract: A bipolar plate for a fuel cell stack of a fuel cell system is described, having at least one main duct portion, which is designed for feeding a fluid (R1, R2, K); a plurality of inflow duct portions that branch off the main duct portion; a plurality of distribution duct portions fluidically connected to the inflow duct portions. The inflow duct portions are arranged along at least a part of the circumferential contour of the main duct portion such that each inflow duct portion, with regard to an imaginary orthogonal, in a respective connecting region of the inflow duct portion and main duct portion, to the circumferential contour at that location, is inclined with respect to this orthogonal such that, between the orthogonal and an inflow duct axis, an angle of incidence is formed, wherein, on the basis of the inclined arrangement of the inflow duct portions, a swirling flow for the fluid flowing in is able to be generated in the main duct portion.

Abstract: A fuel cell stack accommodated in a housing including a first cover and a second cover, which comprises a tensioning system and a plurality of fuel cells, which are arranged in at least two cell series between a first end plate and a second end plate, which at least the first end plate has media connections and distribution structures for media distribution, wherein the first end plate forms the first cover of the housing. A fuel cell device and a motor vehicle comprising such a fuel cell stack is also provided.

Abstract: A bipolar plate for a fuel cell comprises a first reactant flow field on its first plate side and a second reactant flow field on its second plate side, situated opposite the first plate side, wherein the flow fields comprise multiple flow ducts bounded by webs in an active region one of the two reactants taking part in the fuel cell reaction, wherein each time the active region at the inlet side is fluidically connected via a distribution region running outside of the active region to an inlet-side media port for one of the two reactants, extending from the first plate side to the second plate side, and wherein each time the active region at the outlet side is fluidically connected via a collection region running outside the active region to an outlet-side media port extending from the first plate side to the second plate side.

Abstract: A bipolar plate has a first inlet port and a flow field comprising a plurality of ducts to connect the first inlet port to a first outlet port for a first reactant, and has a second inlet port and a flow field comprising a plurality of ducts to connect the second inlet port to a second outlet port for a second reactant, wherein at least one bypass duct is present at the margin of at least one of the flow fields. The bypass duct is associated with at least one flow connection branching off from the bypass duct into an adjacent marginal duct of the flow field.

Abstract: A bipolar plate comprises a passive plate portion having a plurality of media ports and an active plate portion serving for the distribution of the reactants, wherein the passive plate portion and the active plate portion are coupled to each other by means of at least one spring element. A fuel cell stack comprising such a bipolar plate is also provided.

Abstract: A bipolar plate is provided including an outlet port and an inlet port with at least one flow field having a plurality of ducts connecting the inlet port to the outlet port, and with at least one bypass duct at a side of the at least one flow field. A flow resistance in the at least one bypass duct is determined by the design of the at least one bypass duct. A blocking element does not project into a cross section of the at least one bypass duct.