JP2011507211A - Flow field plate for use in a fuel cell stack - Google Patents

Abstract

The present invention comprises at least one flow field plate (1, 9) of conductive material and a meandering electrical assembly (MEA) (39) on each side of the bipolar electrode, the bipolar electrode comprising an electrically insulating seal It consists of a plate (1) mounted in a frame (9), each of which has a channel portion (12) connecting one arbitrary valley (4, 24) on any side of the plate (1). , 32), and a flow field plate for use in a fuel cell stack.
[Selection] Figure 1

Description

  The present invention relates to a flow field plate used in particular for a fuel cell stack, which plate comprises at least one bipolar electrode of conductive material and ion exchange membranes on both sides of the bipolar power.

  A flow field plate (e.g., bipolar electrode and / or separator) is a disc / plate with an open channel that can distribute a supplied reactant, gas, or liquid and provide mechanical strength for fuel / reaction. It can be applied to a reactor cell. The channel distributes the anode reactant on one side and the cathode reactant on the opposite side of the electrode. For example, metals, plastics, and ceramics have been suggested as materials, and it has been shown that channels can be achieved not only by etching, but also by laser removal, chip removal, embossing, pressing, or stamping. In general, the view is that the anode-side channel needs to cross the cathode-side channel, which implies that the plate needs to have a considerable thickness, so that the material is Has been consumed in large quantities. Therefore, the flow field plate was expensive to manufacture. In general, the bipolar electrode may be made of, for example, graphite, in which case the channel pattern may be achieved by molding or chip removal, or may be made of a metal plate, in which case the pattern has been achieved by etching or chip removal. It was. In addition, a plate having a pressed channel pattern has been used, and two plates have been connected to form a bipolar electrode. For example, see not only (Patent Document 1) but also (Patent Document 2) where photolithography etched plates are joined to form a so-called bipolar separator.

International Publication No. 00/31815 Pamphlet US Pat. No. 6,051,331 International Publication No. 0183132 Pamphlet

  It is an object of the present invention to enable the provision of a flow field plate / bipolar electrode that can be easily provided with several different / various flow patterns on the same plate.

Another possible purpose is, for example,
Providing the possibility to create different flow patterns on both sides of the bipolar electrode / flow field plate, for example to create parallel channels on one side and only a single long channel on the opposite side, i.e. Providing the possibility to place a flow path for every geometrical cell,
Openings that are particularly advantageous in connection with materials that are at risk of dissimilar metal contact corrosion because all openings and edges of the plate can be cast into the mass of the frame, thus eliminating the corrosion of the openings To eliminate the corrosion of the
Achieving a bipolar electrode that can provide a reduction in structural height (in a direction perpendicular to the electrode) compared to previously known bipolar electrodes;
-Since the frame is made of an insulating material, the insulation distance between the conductive parts of the bipolar electrode in the fuel cell stack can be increased.
-The flow field plate can be manufactured at a lower cost.

  Using bipolar electrodes of the type described above, one or more of the above objects are achieved by configuring the electrodes according to the claims.

  Hereinafter, the present invention will be described in detail with reference to preferred embodiments and the accompanying drawings.

1 is a plan view of one side of a first embodiment of a bipolar electrode according to the invention, wherein the plate is provided with a channel pattern, where the plate is square and extends toward two opposite side edges of the plate And is included in a sealing frame provided with a portion for forming a curve of the channel. FIG. 2 is a perspective view of the plate of FIG. 1 before being assembled into a frame. FIG. 6 is a cross-sectional view of a plate according to an alternative embodiment. It is sectional drawing by line III-III of FIG. It is sectional drawing by line IV-IV of FIG. It is sectional drawing by line VV of FIG. FIG. 6 is a plan view of one side of a second embodiment of a plate provided with a channel pattern, where the plate is square and has a frame region surrounding the channel pattern, the plate having a channel curve according to the invention; The part to be formed is incorporated into a sealing frame provided. It is sectional drawing by line VII-VII of FIG. It is sectional drawing by line VIII-VIII of FIG. FIG. 6 is a partial view of the upper left corner of FIG. 5 when the plate is provided with a sealing frame having a portion forming a channel curve to form a second preferred embodiment of the bipolar electrode according to the invention. It is sectional drawing by line XX of FIG. It is sectional drawing by line XI-XI of FIG. FIG. 6 is a partial view of the upper left corner of FIG. 5 when the plate is provided with a sealing frame having a portion forming a channel curve to form a third preferred embodiment of the bipolar electrode according to the invention. It is sectional drawing by line XIII-XIII of FIG. Fig. 4 shows different channel patterns achieved by a frame portion formed by channel curves on one side of the bipolar electrode of the present invention. Fig. 4 shows different channel patterns achieved by a frame portion formed by channel curves on the opposite side of the bipolar electrode of the present invention. Fig. 4 shows different channel patterns achieved by a frame portion formed by channel curves on one side of the bipolar electrode of the present invention. Fig. 4 shows different channel patterns achieved by a frame portion formed by channel curves on the opposite side of the bipolar electrode of the present invention. Fig. 4 shows different channel patterns achieved by a frame portion formed by channel curves on one side of the bipolar electrode of the present invention. Fig. 4 shows different channel patterns achieved by a frame portion formed by channel curves on the opposite side of the bipolar electrode of the present invention. 3 shows an alternative embodiment of the present invention.

  1, 3 and 4 show the principle of an embodiment according to the invention of a bipolar electrode comprising a plate according to FIGS. 2a and 2b, respectively, for use in a fuel cell stack. Within such a fuel cell stack there is at least one, preferably a plurality of conductive bipolar electrodes on each side of each bipolar electrode, and at least one proton exchange membrane.

  According to the present invention, the bipolar electrodes shown in FIGS. 1, 3, 4 and 5 are more clearly shown in FIG. 2a in the range of 0.1-1 mm, preferably up to 0.5 mm, more Preferably it consists of only one plate 1 having a material thickness of at most 0.2 mm. The pattern of the open channel 3 is arranged on one side of the plate and the pattern of the open channel 23 is on the opposite side so that the valleys 4 and 24 of the pattern on one side of the plate form opposite peaks 25 and 5 respectively. Be placed. The pattern portion of the plate has, for example, a substantially sinusoidal cross-section, as shown in FIG. 2a, so that the first side channel 3 has the same width B1, B2 as the second side channel 23. Is obtained.

  In other embodiments, as shown in FIGS. 6 and 7, the peaks and valleys have parallel trapezoidal sections that are substantially equally aligned. Further, as shown in FIG. 2b, the width of the valley may be different from the width of the peak, with the wide and narrow valleys on one side corresponding to the wide and narrow valleys on the opposite side, thereby A channel having a wider width B1 is formed on the first side, and a channel 23 having a narrower width B2 is formed on the second side. This possibility may be of interest, for example, in fuel cells.

Furthermore, according to the invention, the plate 1 is mounted in an electrically insulated sealing frame 9 having a total thickness H that is essentially the same as the height h of the plate 1 (see FIG. 3). whereby each of the surfaces 90A and 90B have the same level as each peak 5,25, whereby the plate 1 and a common sealing plate P1 _s and P _2-s to the respective sealing 9 on each side It is formed. In this way, the electrodes can be easily disposed by sealing against the opposing flat surface 29 '. See FIG.

  From the figure, plate 7, which is illustrated here with backflow, is shown with openings 7, 28 for allowing reactants to flow into channels 3, 23 on two sides of plate 1, as well as the reaction product formed. It can also be seen that openings 27 and 8 are provided for flow out of the channels 3 and 23. The first recesses 10, 31 in the sealing frame 9 form a flat path between each inflow opening 7, 28 and the respective adjacent ends of the channels 3 and 23. Second recesses 11, 30 in the sealing frame 9 achieve a flat path between each outflow opening 27, 8 and the respective adjacent end of the channels 3 and 23. Furthermore, within the seal 9, there are a plurality of additional depressions forming a plurality of channel portions 12, 32, each channel portion 12, 32 having an optional valley 4, 24 following the same side of the plate 1, Connected to the leading or parallel connected valleys, whereby at least one flow path 3, 23 is formed from each inflow opening 7, 28 to each outflow opening 8, 27.

  In the embodiment shown in FIGS. 1, 2a, 3-5, each channel portion 12 and 32 forms a U-shape. Between the legs of each U-shaped channel portion 12 and 32 is a seal / flow barrier 9 '' surrounded by the channel portions 12, 32 at the ends of the peaks 5 and 25, respectively. Further, between each such U-shaped channel portion 12, 32 is a sealing tongue 9 ′ that extends from the outside of the sealing frame 9 to each of the intermediate peaks 5 and 25. , Sealed against its end, and then between the channel portions 12, 32. Thus, the flow barrier 9 ″ and the sealing tongue 9 ′ extend beyond the side edge 100 of the plate 1, which is achieved during manufacture when the plate 1 is cast into the material forming the seal 9.

  A plate 1 having valleys 4, 25 and peaks 5, 25 can be provided with a single shape, and connecting the valleys, the flow paths 3, 23 for the reactants and reaction products formed. The channel portions 12, 32 required to form the are placed in the surrounding frame 9, so that greater flexibility can be achieved, materials and costs can be selected and the manufacturing process can be chosen, and the desired Then, the structural height of the completed bipolar electrode can be made smaller than before. By forming these channel portions 12, 32 in the seal 9, a much greater number of variations in the flow pattern are achieved with the possibility of using only a limited number of designs of the plate 1. Can do.

  In the preferred embodiment shown in FIG. 2b, the valley 4 on one side of the plate 1 is wider than the reverse side and the peak 5 is narrower than the reverse side, so that the channel 3 on each side is more than the B2 of the channel 23 on the reverse side. Wide B1. In this case, in the fuel cell application, for example, air can be directed to a wide valley on one side of the plate, and hydrogen gas can be directed to a narrow valley on the opposite side of the plate.

  In the case of a backflow procedure, it is true that the inflow opening 7 arranged at the first corner is connected directly to the channel 3 on one side of the plate 1 via the inflow channel 10. Thus, via the channel portion 12 connecting the adjacent valleys 4, the channel 3 is in a serpentine flow and is disposed in the vicinity of the second corner diagonally opposite via the end of the straight outflow channel 11. Ends in the outlet 8 which has been made. Correspondingly, a connection extends through the opposite channel 23 between a second inflow opening 28 and a second outflow opening 27 arranged at a second corner. In contrast to the upper channels 10, 11, the lower inflow / outflow channels 30, 31 extend into the channel 23 at an angle.

  In the illustrated bipolar electrode parallel flow embodiment, exactly the same structure is used, but the reverse is valid for the inlet / outlet. That is, the openings 7 and 27 for allowing the reactant to flow in are disposed adjacent to each other, and the openings 8 and 28 for allowing the formed reaction product to flow out are also disposed adjacent to each other.

  The sealing frame 9 has, for example, an opening 19 for the inflow and outflow of a cooling medium intended to flow in the channel on one side of the plate 1 but not the reactants when cooling is required, and the plate. An opening 20 may also be provided for retracting a rod (not shown) that is held together in the fuel cell stack. An additional opening 19 may be connected to the valleys 4 and 24 by a recess (not shown) in the sealing frame 9.

  In the above-described embodiment, the side edge 100 of the plate 1 is entirely enclosed in the electrically insulated sealing frame 9. In the sealing frame 9, the flow from the respective inflow openings for the reactants to the respective channels 3, 23 is partially distributed, and the flow from the respective channels for the formed reaction products to the respective outflow openings. And, in part, a recess is provided that provides a valley connection to be connected. Preferably, the material of each of the sealing frames 9, 29 and 49, 54 is selected from the group of materials that are sufficiently resistant to the reactants used and the reaction products formed, and the materials are conductive. I don't have it. Preferably, at least most of the valleys 4, 24 are straight and have equal lengths. In the embodiment shown in FIGS. 1 to 5 and 2 b, the channel pattern covers substantially the entire plate 1, so that the valleys 4, 24 have a full depth towards the two opposite edges 100 of the plate 1. The peaks 5 and 25 have a total height. The plate according to this embodiment can be produced simply by bending the sheet, for example.

  3 and 4, it is shown that the bipolar electrode in the fuel cell is surrounded on both sides by a membrane electrode assembly 39 (MEA). Further, as shown in the cross-section of FIG. 1, ie, FIGS. 3, 4, and 5, the height h ′ of the channel portions 12, 32 and the respective heights of the inflow and outflow channels 10, 11, 30, 31 are shown. In addition, it has a depth that does not exceed H2. That is, h ′ <0.5H. In this way, it is possible to place the upper channel portion 12 in the same cross-sectional plane as the lower channel portion 32. The design of the channel portions 12, 32 is selected, which implies that the cross-section is substantially constant in a plane perpendicular to the flow direction, thereby implying that the flow resistance in each channel 3 is substantially the same. This is because if the depth h ′ of the channel portions 12, 32 is essentially less than the central depth h of the channels 3, 23 of the plate 1, the width of the legs of the U-shaped portions 12, 32 is preferably It implies that it should be essentially wider than the width B1, B2 of the channel in the middle of the plate 1. For example, if a pressure drop is desired to achieve a specific leakage flow through the gas diffusion layer of the MEA between adjacent channels (thus increasing the “active surface” / yield), the cross-sectional area is smaller Channel portions 12, 32 may be selected.

  The film itself is indicated by 33, and gas diffusion films 34 and 35 are provided on both sides thereof. In a manner known per se, the membrane 33 and the gas diffusion layers 34, 35 are adapted to the reactions carried out in the fuel cell. The gas diffusion layers 34, 35 are electrically conductive and can be made of, for example, a carbon fiber web or graphite paper. The unit 39 composed of the membrane 33 itself and the gas diffusion layers 34 and 35 is sometimes referred to as MEA (membrane electrode assembly). Furthermore, it may be advantageous to have a frame area that is accommodated in the sealing frame 36, the membrane unit sealing sealing frame being in contact with the bipolar electrode sealing. In the fuel cell stack, one gas diffusion layer 34 abuts the peak of the peak 5 on one side of the bipolar electrode to delimit the channel 4 between the peaks 5, and the other gas diffusion layer 35 is a bipolar electrode. In contact with the peak of the mountain 25 on the opposite side to the boundary of the valley 24 between the peaks 25. Of course, the membrane unit 39 or its sealing frame 36 is also provided with an opening corresponding to the opening of the bipolar electrode.

  In the embodiment according to FIGS. 6 to 13, the channel patterns 2, 22 are arranged in the central part of the plate 1 and best surrounded by the frame parts 6, 26, as best shown in FIGS. 6 and 26, openings 7 and 27 are arranged (in parallel flow) to allow the reactants to flow into the channels 3 and 23 on both sides of the plate 1. The plate 1 is also provided with openings 8, 28 through which the reaction products flow out of the channels 3, 23 on both sides of the plate, at least most of the channels 3, 23 being straight, having the same length and frame portion 6, With an end at 26. Further, in this case, the channel portions 12 and 32 necessary for connecting the valleys 4 and 24 to form the reactant and reaction product flow paths are arranged in the surrounding frame 9, which is shown in FIGS. It is shown in FIG. However, in this embodiment, the valleys / peaks are bent into the plate so that the dense end walls 4 ', 24' connect the valleys 4, 24 to the frame regions 6, 26.

  According to a preferred embodiment, the plate 1 is suitably made of sheet metal having a material thickness of at most 1 mm, preferably 0.1 to 0.8 mm, thereby keeping the manufacturing costs and the structural height low. it can.

  A particularly suitable pressing method for achieving the channel patterns 2 and 22 is an adiabatic press, so that US Pat.

  In an alternative embodiment, the plate 1 is made of a polymer with good conductivity that is resistant to the reactants that are fed into or formed in the fuel cell stack.

  The frame regions 6 and 26 are arranged in the plane P of the bipolar electrode, and this plane is arranged between the peak of the peak 5 on one side of the electrode and the peak of the peak 25 on the opposite side. This plane may be located midway between the peak on one side of the plate and the peak on the opposite side. If desired, this plane can be displaced in the direction toward the peak on one side to increase the pressure drop on one side of the plate, while at the same time allowing the pressure drop on the opposite side of the plate to be reduced. is there.

  When the plate 1 shown in FIGS. 6 to 13 is used as a bipolar electrode in a fuel cell stack, it is suitable to obtain the best protection against corrosion and the best electrical insulation, since the entire frame region 6 is electrically The recesses 10 and 30 partially connect the respective reaction flow inlets 7 and 27 to the respective channels 3 and 23, and the recesses 11 and 31 respectively connect the respective channels 3 and 23. The connection between each outlet of the reaction product is most clearly shown in FIGS. FIG. 9 shows that in a preferred embodiment, each opening edge in the plate (see, eg, FIG. 7) is surrounded by the sealing material of the sealing frame 9, thereby increasing the insulation path between essentially continuous surfaces. Make it clear.

  As can be seen from the plan views and cross-sections of FIGS. 7-13, the present invention offers the possibility for very high flexibility even when the frame regions 6, 16 are used. See, for example, FIGS. 9 and 12 in which essentially the same type of plate 1 with frames 6, 26 is used, but the sealing frame 9 has an essentially different design. In FIG. 9, the channel portion 12 is arranged in the sealing frame 9 by an essentially U-shaped recess, as already described in connection with FIGS. In contrast to FIGS. 1 to 5, the sealing part 9 ′ arranged between the U-shaped legs is not actually necessary from a sealing point of view.

  In the embodiment according to FIGS. 6 to 13 in which the channels 3, 23 are arranged, the plate 1 has no openings and the dense end faces 4 ′, 24 ′ control the flow, reverse from one side through the ends of the valleys 4, 24. There is no risk of cross-flow to the side. Conversely, in many applications, it may still be preferable to place such a U-shaped portion of the encapsulant 9 'to provide additional support to the membrane leaning against the electrode.

  According to the embodiment shown in FIG. 9, the flow is forced (via parallel flow) through the inflow opening 7 through the recess 10 of the sealing material 9 and connected there, the top side of the electrode (see FIG. 9). 9) (shown in FIG. 9) into the valley forming the beginning of channel 3. The channel then snakes and extends to the outflow opening (not shown) as described above. The opposite channel may be arranged in a corresponding manner. In FIG. 12, instead of the meandering flow, the flow path in the sealing frame 9 is simply opened so that the inflow opening 7 is directly connected to each one of the parallel valleys 4 so that the parallel flow is also shown. It can be easily achieved. The different types of combinations according to this principle model, especially in combination with the possibility of positioning the plate P at different distances and / or using different width B1, B2 channels on each side, Is possible.

  14 to 16 schematically show the different flow paths, showing a few possible embodiments where one side of the electrode envisioned by the present invention is shown in the left column and the back is shown in the right column Shows the extraordinary flexibility that can be achieved using the present invention.

  FIG. 14 shows that the present invention allows multiple parallel channels to be easily achieved on one side using a so-called “dead end” that may be preferred in certain applications, such as those related to hydrogen gas. . At the same time, on the opposite side, only every other valley can be connected to the serpentine pattern, thereby making the overall flow path on the back essentially shorter than the front, which is the desired application in certain cases It is an example.

  FIG. 15 shows a variant in which the valley according to the invention is used for flow through, while the back (15A) gives a conventional meander pattern.

  In FIG. 16, the same plate is used in the same manner as described above, for example, by connecting each of the four valleys on one side in FIG. Each can also be obtained, while in FIG. 16A it is shown that every other adjacent valley is connected to the opposite side. This possibility of changing the flow pattern is therefore a great advantage according to the invention.

  In an alternative embodiment shown in FIG. 17, the plate 41 is round and generally circular. Within the plate 41, the pattern 42 of the open channel 43 on one side of the plate and the pattern not shown of the channel on the opposite side of the plate have valleys 44 between the peaks 45 of the pattern on one side of the plate. They are arranged to form a mountain between them and vice versa. More precisely, the channel pattern consists of only one peak and adjacent channels extending in a spiral inward. Of course, if desired, two or more parallel peaks with adjacent valleys extending spirally over the patterned area can be created, thereby forming a corresponding number of channels on each side of the plate. Is possible. The frame region 46 extending along the periphery of the plate has a first opening 47 for inflow or outflow of the channel 43 on one side of the plate 41, and an opposite side of the plate 41 in relation to the first opening 47. A second opening is provided for inflow or outflow of the channel. The central inner region 53 has a first opening 48 for the outflow or inflow of the channel 43 on one side of the plate, and in relation to the first opening 48, the central region 53 has a channel on the opposite side of the plate. A second opening 68 for outflow or inflow is provided.

  Both the frame region 46 and the central interior region 53 are located in the plane of the bipolar electrode, and this plane is located between the peak of the peak 45 on one side of the electrode and the peak of the opposite peak. As in the embodiment of FIGS. 3-6, this plane may consist of a median plane between the peak on one side of the plate and the peak on the opposite side. If desired, this plane can be displaced in a direction toward the peak on one side.

  In the embodiment of the plate 41 shown in FIG. 17, additional openings, i.e., openings 59 for supplying / discharging the circulation medium, e.g. cooling water, and a draw bar for holding the fuel cell stack together in the axial direction. An opening 60 for inserting a frame is disposed in the frame region 46.

  In addition, indentations 50, 70 that partially connect each reaction stream inlet 46, 47 to the opposite channel 43 and adjacent channel 41, respectively, and these channels to each outlet 48, 68 for reaction products. The entire frame region 46 and the central inner region 53 having the recesses 51 and 71 may be appropriately placed in the electrically insulating sealing frame 49 and the inner sealing frame 54 as described above for the other embodiments. Indicated. Of course, the sealing frame 49 and the inner sealing frame 54 exist on both sides of the plate 41. Furthermore, in this context, the inner sealing frame 54 does not surround any central area in the illustrated embodiment, but is referred to as a frame somewhat inappropriately.

  If the sheet material of the plates 1, 41 is made of a material that is affected by the reactants or reaction products formed, it is suitable to provide a thin protective layer of unaffected material on both sides of the plates 1, 41. The outer edges and openings 7, 8, 27, 28, 19, 20, 47, 48, 59, 60, 67, 68 of the plate are produced, for example, through punching, the other edges and the inside of the openings are not protected, Thus, it indicates an area that can be affected by reactants and / or reaction products. Therefore, the sealing frames 9, 49 and 54 also include the edges of the plates and the openings 7, 8, 27, 28, 19, 20, 47, 48, 59, 60, 67, 68, thereby Is suitably protected from foreign metal contact corrosion between the reactants and / or reaction products and the protective layer and the base material of the plates 1, 41. The inclusion of an outer edge also provides protection against unwanted electrical contact.

  The bipolar electrode according to the present invention provides the following advantages, for example, when manufacturing a fuel cell stack.

  Simple and inexpensive manufacture of bipolar electrodes / flow field plates with complex patterns. Insulations such as outer edges and screw holes at the time of stack manufacture are easily eliminated by selecting an insulating material for the frame, thereby facilitating mounting. The need to loosen the seal is reduced. Since all the openings and edges of the plate are cast into the frame mass, there is no corrosion of the openings. Sealing around the inlet and outlet is simple because metal manufacturing can create expensive designs.

  In the conventional stack, since the insulation distance corresponds to the thickness of only the film, an electric overload may be applied between the plates through the flow path from the battery to the battery. If the frame is made of an insulating material, the insulation distance increases dramatically.

  The present invention is not limited to the above description, but can be modified within the scope of the appended claims. It will be appreciated that this principle provides the possibility to place flow channels both on the outer edge and inside the pattern of all geometrical flow plates.

  By selecting a suitable material for the frame, the pressure in the stack is evenly distributed throughout the stack.

  Different flow patterns can be created on both sides of the bipolar electrode / flow field plate, eg, parallel channels on one side and only one long channel on the opposite side.

  Different materials can be mixed within the frame to give the frame exactly the right attributes from both a chemical and mechanical point of view.

  The plate itself can be manufactured with different materials in different ways, for example by pressing / bending a thin metal sheet.

  Two different flow field plates can be connected and embedded to achieve different patterns on both sides and / or create additional channels between the plates, for example for cooling.

  The guide spindle can be easily embedded so that the stack cannot be attached in the wrong way.

Industrial Applicability The flow field plate according to the invention described above is in principle intended for use in a fuel cell of the type driven by hydrogen gas and using air or oxygen gas as the oxidizing medium, Of course, those skilled in the art may modify the invention within the scope of the following claims so that they can be used in the adjacent field of application simply without any inventive work.

Claims (16)

  Comprising at least one disc-shaped flow part (1) having valleys (4, 24) on each side and a sealing frame (9) arranged on said flow part (1), said flow part preferably Comprises a plate (1) disposed on an electrically insulating sealing frame (9), wherein at least some of the troughs (4, 24) are flow patterned in the sealing frame (9). A flow field plate for use in a fuel cell stack, provided with a channel portion (12, 32) connected to the sealing frame (9), the reactant to the channel (3, 23) and the channel ( Each of at least two inflow openings and at least two outflow openings (8, 28, 7, 27) for reaction products from 3, 23) and channels (3, 23) on both sides of said plate (1) And the inflow / outflow First and second in the sealing frame (9) for achieving a flow path between each one of the mouths (8, 28, 7, 27) and the end of the valley (respectively 4 and 24) Each of the recesses (11, 31, 10, 30) is provided with a flow field plate.   An open channel (3, 23) is formed in the plate (1) so that a valley (4) on one side of the plate forms a peak (25) on the opposite side and vice versa. The flow field plate according to claim 1, wherein   Flow field plate according to claim 2, characterized in that the plate (1) has a material thickness of at most 2 mm, preferably 0.05-0.8 mm, more preferably at most 0.5 mm. .   Each one is an arbitrary valley of the plate (1) such that the flow pattern is formed on each side from each inflow opening to at least substantially the entire plate (1) to each of the outflow openings. 4. A plurality of channel portions (12, 32) connecting (4, 24) to subsequent, preceding, or parallel coupled valleys on the same side of the plate (1). The flow field plate according to claim 1.   The flow field plate according to any one of claims 1 to 4, characterized in that the valley on one side of the plate (1) is wider than the opposite side and the peak is narrow.   The thickness (H) of the sealing frame (9) is essentially the same as the height (h) of the plate (1), according to any one of the preceding claims. Flow field plate as described.   The flow field plate according to claim 6, characterized in that the height (h ') of the main extension of the channel part (12, 32) is less than H / 2.   8. A flow field plate according to any one of the preceding claims, characterized in that at least most of the valleys (4, 24) are essentially straight and preferably have the same length.   The plate (1) is circular, the sealing frame (9) comprises an outer frame along the periphery of the plate, and an inner frame arranged at a distance therefrom; and the channel ( The flow field plate according to claim 1, wherein 3, 23) is curved.   Into the sealing frame (9) an additional medium, preferably a cooling medium, intended to flow in the channel (3, 23) instead of a reactant on one or both sides of the plate (1) and A flow field plate according to any one of the preceding claims, characterized in that an additional opening (19) for the outflow is provided.   The channel pattern (2, 22) covers at least substantially the whole of the plate (1), so that the valleys (4, 24) face two opposite edges (100) of the plate (1). 11. A flow field plate according to any one of the preceding claims, characterized in that it has a full depth and the peaks (5, 25) have a full height.   A frame region (1) in which the plate (1) is arranged at the periphery arranged on a plane (P) between the peak of the peak (5) on one side of the bipolar electrode and the peak of the peak (25) on the opposite side. The flow field plate according to claim 1, wherein the flow field plate is provided with 6, 26).   Flow field plate according to any one of the preceding claims, characterized in that the sealing frame (9) is arranged to wrap around at least some edges of the plate (1).   14. A flow field plate according to claim 13, characterized in that the sealing frame (9) is arranged to wrap around the edges of at least a plurality of openings in the plate (1).   15. A flow field plate according to claim 14, characterized in that the sealing frame (9) extends to all edges including the edge of the opening in the plate (1).   16. The channel according to any one of the preceding claims, characterized in that the channel portions (12, 32) having different shapes on both sides are arranged, whereby different channel patterns / flow patterns are achieved on both sides. Flow field plate as described.

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