A fuel cell unit, comprising a first separator and a second separator that are opposite to each other, and membrane electrode assemblies stacked between the first separator and the second separator, wherein each membrane electrode assembly comprises a catalyst coating membrane, and a first gas diffusion layer and a second gas diffusion layer respectively provided at the two sides of the catalyst coating membrane. The fuel cell unit further comprises a gas guide flow path located between the separator and the gas diffusion layer that are opposite to each other, and a coolant flow path located between the first separator and/or the second separator and another fuel cell unit, wherein the gas guide flow path is attached on the surface of the gas diffusion layer and/or the opposite separator, and the coolant flow path is attached on the outside surface of the first separator and/or the second separator.

A bipolar plate for a fuel cell includes an anode plate and a cathode plate. The anode plate has hydrogen flow channels on a first side of the anode plate and coolant channels on a second side of the anode plate. The cathode plate has a first side disposed against the second side of the anode plate to cover the coolant channels and has a second side defining a recessed pocket configured to receive a stream of air. A flow guide is disposed in the pocket such that an inlet manifold is formed along a first edge of the flow guide and an outlet manifold is formed along a second edge of the flow guide. The flow guide defines channels extending from the inlet manifold to the outlet manifold. A plurality of openings is defined by through the flow guide.

A bipolar plate for a fuel cell includes an anode plate and a cathode plate. The anode plate has hydrogen flow channels on a first side of the anode plate and coolant channels on a second side of the anode plate. The cathode plate has a first side disposed against the second side of the anode plate to cover the coolant channels and has a second side defining a recessed pocket configured to receive a stream of air. A flow guide is disposed in the pocket such that an inlet manifold is formed along a first edge of the flow guide and an outlet manifold is formed along a second edge of the flow guide. The flow guide defines channels extending from the inlet manifold to the outlet manifold. A plurality of openings is defined by through the flow guide.

A bipolar conductive plate for a fuel cell structure, the plate having a network of fluid circulation channels in the form of a succession of undulations with narrowed portions preferably distributed regularly in order to reduce the stratification phenomena.

A bipolar conductive plate for a fuel cell structure, the plate having a network of fluid circulation channels in the form of a succession of undulations with narrowed portions preferably distributed regularly in order to reduce the stratification phenomena.

The invention relates to a distributor plate (7) for an electrochemical cell (1), the distributor plate (7) having a structure comprising connecting portions (12) with surfaces (13), and main ducts (11) having floor surfaces (33).

The surfaces (13) and optionally on the floor surfaces (33) of the secondary ducts (15) are provided with a pattern (92) and

the distributor plate (7) has at least two regions (94) in which the patterns (92) on the surfaces (13) differ from one another. The invention further relates to a method for producing the distributor plate (7), an electrochemical cell (1), and a method for operating an electrochemical cell (1).

The invention relates to a distributor plate (7) for an electrochemical cell (1), the distributor plate (7) having a structure comprising connecting portions (12) with surfaces (13), and main ducts (11) having floor surfaces (33).

The surfaces (13) and optionally on the floor surfaces (33) of the secondary ducts (15) are provided with a pattern (92) and

the distributor plate (7) has at least two regions (94) in which the patterns (92) on the surfaces (13) differ from one another. The invention further relates to a method for producing the distributor plate (7), an electrochemical cell (1), and a method for operating an electrochemical cell (1).

A fuel cell system includes a first fluid flow plate including a first plurality of first channels for flow of an oxidant or a fuel. The plurality of first channel has first channel cross-sectional flow areas. A second fluid flow plate includes a second plurality of second channels for flow of an oxidant or a fuel. The plurality of second channels has second channel cross-sectional flow areas. A membrane electrode assembly is located between the first plate and the second plate. The first flow plate includes a passage for a flow of a fluid entirely on a seam side of the first flow plate as the first plurality of first channels. The passage has a cross-sectional area for flow of the fluid smaller than the first channel cross-sectional flow area.

A first metal separator of a power generation cell includes an oxygen-containing gas flow field extending along an electrode surface of a membrane electrode assembly, an oxygen-containing gas supply passage connected to the oxygen-containing gas flow field and extending through the first metal separator in a separator thickness direction, and a passage bead formed around the oxygen-containing gas supply passage and protruding in the separator thickness direction. A water drainage channel configured to connect an inner space of the passage bead with the oxygen-containing gas supply passage is provided at a lower portion of the passage bead.

A first metal separator of a power generation cell includes an oxygen-containing gas flow field extending along an electrode surface of a membrane electrode assembly, an oxygen-containing gas supply passage connected to the oxygen-containing gas flow field and extending through the first metal separator in a separator thickness direction, and a passage bead formed around the oxygen-containing gas supply passage and protruding in the separator thickness direction. A water drainage channel configured to connect an inner space of the passage bead with the oxygen-containing gas supply passage is provided at a lower portion of the passage bead.