NOVELTY - The plate (10) has a set of identical fluid circulation channels (1-9) parallel to a lateral edge (10b) of the plate. The channels are mounted in a consecutive manner between them, and reactive fluid circulates in the channels. Each channel is constituted by a rectilinear conduit of constant section extending from an upper edge (10a) of the plate vertically towards the bottom to a lower edge (10c) of the plate and is arranged such that the flow of the fluid circulates in a downward direction when the plate is in a vertical direction using gravity force acting vertically towards the bottom.    USE - Used for a fuel cell (claimed) e.g. proton exchange membrane type fuel cell, that is utilized in a motor vehicle and for assuring sufficient mechanical stability and permitting air distribution in anodic and catholic chambers.    ADVANTAGE - Fluid circulation channel is constituted by the rectilinear conduit of constant section extending from the upper edge vertically towards the bottom to the lower edge and is arranged such that the flow of the fluid circulates in the downward direction when the bipolar plate is in the vertical direction using the gravity force acting vertically towards the bottom, thus limiting the risk of appearance of stoppers at the level of the bipolar plate in an efficient and cost effective manner, and reducing the pressure losses in the channels, and hence simplifying the control of operation of the proton exchange membrane type fuel cell, and increasing the safety of the operation of the fuel cell. The plate orients the flow of the fluid to the interior of each channel in same direction of the force of gravity, thus providing a good circulation of the fluid interior of the channels.    DESCRIPTION OF DRAWING(S) - The figure shows an example of arrangement of fluid circulation channels of a bipolar plate for a proton exchange membrane type fuel cell.    Identical fluid circulation channels (1-9)    Bipolar plate (10)    Bipolar plate`s upper edge (10a)    Bipolar plate`s lateral edge (10b)    Bipolar plate`s lower edge (10c)