Bipolar plate, characterized in that it comprises first and second conductive sheets (51, 52), and in which: - an inlet manifold and an outlet manifold of a fuel and an inlet manifold and an outlet manifold of an oxidant are made through the first and second conductive sheets; - an outer face of the first conductive sheet comprises: - first ribs delimiting fuel flow channels, these fuel flow channels being in communication with the fuel inlet and outlet manifolds; - a second rib extending on the side of the fuel flow channels, a gasket extending at least partially on said second rib; - third ribs (517, 584) extending between one of said first ribs and the second rib, an alternation of third ribs and of first reinforcements being formed in an intermediate zone extending between this first rib and the second rib, the height between the third ribs and the first reinforcements being at least equal to 75% of the total height he of the flow channels; - an outer face of the second conductive sheet comprises: - fourth ribs delimiting oxidant flow channels, these oxidant flow channels being in communication with the oxidant inlet and outlet manifolds (592, 595); - a fifth rib extending directly below the second rib, a gasket extending along said fifth rib; - sixth ribs (561, 566) extending between one of said fourth ribs and the fifth rib, an alternation of sixth ribs and of second reinforcements being formed between this fourth rib and the fifth rib, the height between the sixth ribs and the second reinforcements being at least equal to 75% of the total height he of the flow channels; - at least one third rib housing at least two second reinforcements with which it is in contact. - at least one sixth rib housing at least two first reinforcements with which it is in contact. - an inlet manifold and an outlet manifold of a fuel and an inlet manifold and an outlet manifold of an oxidant are made through the first and second conductive sheets; - an outer face of the first conductive sheet comprises: - first ribs delimiting fuel flow channels, these fuel flow channels being in communication with the fuel inlet and outlet manifolds; - a second rib extending on the side of the fuel flow channels, a gasket extending at least partially on said second rib; - third ribs (517, 584) extending between one of said first ribs and the second rib, an alternation of third ribs and of first reinforcements being formed in an intermediate zone extending between this first rib and the second rib, the height between the third ribs and the first reinforcements being at least equal to 75% of the total height he of the flow channels; - first ribs delimiting fuel flow channels, these fuel flow channels being in communication with the fuel inlet and outlet manifolds; - a second rib extending on the side of the fuel flow channels, a gasket extending at least partially on said second rib; - third ribs (517, 584) extending between one of said first ribs and the second rib, an alternation of third ribs and of first reinforcements being formed in an intermediate zone extending between this first rib and the second rib, the height between the third ribs and the first reinforcements being at least equal to 75% of the total height he of the flow channels; - an outer face of the second conductive sheet comprises: - fourth ribs delimiting oxidant flow channels, these oxidant flow channels being in communication with the oxidant inlet and outlet manifolds (592, 595); - a fifth rib extending directly below the second rib, a gasket extending along said fifth rib; - sixth ribs (561, 566) extending between one of said fourth ribs and the fifth rib, an alternation of sixth ribs and of second reinforcements being formed between this fourth rib and the fifth rib, the height between the sixth ribs and the second reinforcements being at least equal to 75% of the total height he of the flow channels; - fourth ribs delimiting oxidant flow channels, these oxidant flow channels being in communication with the oxidant inlet and outlet manifolds (592, 595); - a fifth rib extending directly below the second rib, a gasket extending along said fifth rib; - sixth ribs (561, 566) extending between one of said fourth ribs and the fifth rib, an alternation of sixth ribs and of second reinforcements being formed between this fourth rib and the fifth rib, the height between the sixth ribs and the second reinforcements being at least equal to 75% of the total height he of the flow channels; - at least one third rib housing at least two second reinforcements with which it is in contact. - at least one sixth rib housing at least two first reinforcements with which it is in contact.