Bipolar plate for fuel cell, comprising sealing ribs
A technology of fuel cells and bipolar plates, which is applied in the parts of fuel cells, fuel cells, sealing/supporting devices, etc., can solve problems such as impossible
Active Publication Date: 2010-02-03
PEZHO SITROEN AUTOMOBILS SA +1
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Problems solved by technology
This technique has the disadvantage that, for the same bipolar plate, in addition to the two bipolar half-plates, a supplementary part is required, which is used to ensure the joint between the two bipolar half-plates and to ensure the supply of fluids and by-products and discharge
thus resulting in the formation of relatively large bipolar plates
[0005] [05] In particular, one of the reasons for the relatively large size of the bipolar plates is that it is necessary to consider the tightness around the individual current collectors on the one hand and to ensure the tightness of the entire periphery of the bipolar plates on the other hand.
However, it is not possible to use the same rib to simultaneously seal all fluid supplies or discharges and seal the entire perimeter of the bipolar plate as this would cause mixing of the different fluids
Method used
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Embodiment Construction
[0016] [16] in figure 1 Only a single surface can be seen in the bipolar plate shown, which consists of a cathode or anode bipolar half-plate 1 and a further anode or cathode bipolar half-plate 1' (partially shown) exist figure 2 above), the two bipolar half-plates are connected to each other by their inner surfaces. The two bipolar half-plates, which have an identical shape, each consist of a metal plate, for example generally rectangular, made of stainless steel. The central part 2 of each bipolar half-plate constitutes the active area to ensure that the flow of active fluid is well distributed on the outer surface of each bipolar half-plate, and that the flow of heat-carrying fluid is between the two bipolar half-plates well distributed. The two bipolar half-plates comprise, on their periphery, generally elongated cutouts 4, 5, 6 for forming fluid box channels for the supply and discharge of the different fluids necessary for the operation of the battery.
[0017] [17]...
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The invention relates to a bipolar plate for a fuel cell, of the type that comprises a cathode bipolar half plate and an anode bipolar half plate which are placed next to one another. Each bipolar half plate (1) consists of a plate, the central part of which comprises an active zone (2), while the periphery thereof comprises a plurality of cut-outs (4) which are intended to form at least two oxidant tanks, at least two fuel tanks and at least two coolant tanks. Moreover, at least one bipolar half plate comprises at least one connecting rib (8) between a peripheral cut-out and the active zone.The invention is characterised in that each cut-out (4) that is intended to form a coolant tank is surrounded by a tank-sealing rib (7) which projects out from the outer face of the bipolar half plate. The invention is also characterised in that the periphery of each bipolar half plate comprises a rib (15) for sealing the active zone, which projects out from the outer face of the bipolar half plate, such as to connect the coolant tank sealing ribs (7) in a continuous manner and to surround the oxidant and fuel tanks. Furthermore, each channel formed by a rib segment (15A) between two coolant tanks is blocked by a blocking means (17).
Description
technical field [0001] [01] The present invention relates to a bipolar plate for a proton exchange membrane fuel cell. A bipolar plate consists of two bipolar half-plates bonded to each other, each bipolar half-plate consisting of a generally rectangular plate comprising in its central part a web of ribs constituting the active zone and at its periphery comprising A plurality of cutouts are used to form the fluid box, and ribs are used to ensure sealing. Background technique [0002] [02] A proton exchange membrane fuel cell is a device that generates electric current through an electrochemical reaction between a fuel such as a hydrogen-containing gas and a combustion oxidizer such as an oxygen-containing gas separated by a wall composed of a solid electrolyte separated. In one such device, the fuel and the oxidant react to form a reaction product such as water while generating an electrical current that can be used for various purposes. [0003] [03] Generally, a fuel ce...
Claims
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IPC IPC(8): H01M8/02
CPCH01M8/0247H01M8/0267Y02E60/50H01M8/021H01M8/0297H01M8/0284H01M2008/1095H01M8/2483H01M8/0273
Inventor F·罗伊D·勒马松J-P·普瓦罗-克鲁弗齐耶P·勒加罗
Owner PEZHO SITROEN AUTOMOBILS SA