Polar separator and fuel cell including such a polar separator

Abstract

Polar separator and fuel cell comprising such a polar separator. Polar separator (5), comprising: conveying walls (52H, 72H) including an internal conveying end (61H, 81H), bordering an internal conveying inlet (58H, 78H); injection walls (52A) including: an internal injection end (61A), facing the internal conveying ends (61H, 81H). The conveying walls (52H, 72H) form: a first group (G1H), for which each internal conveying inlet (58H, 78H) has a reduced cross-section, and a second group (G2H), for which each internal conveying inlet (58H, 78H) has an equal cross-section. The injection walls (52A) form: a first group (G1A), for which each internal injection inlet (58A) has a reduced cross-section, and a second group (G2A), for which each internal injection inlet (58A) has an equal cross-section.Figure for the abbreviation: Figure 4.

Description

Title of the invention: Polar separator and fuel cell comprising such a polar separator

[0001] The present invention relates to a polar separator and a fuel cell comprising such a polar separator.

[0002] US20190348689A1 describes a separator for an electrochemical cell of a battery The fuel separator comprises a main body with a distribution opening and inlet openings. The main body forms, on its surface, a reaction surface and a diffusion section arranged between the inlet openings and the reaction surface. The inlet openings are arranged between the distribution opening and the diffusion section. The diffusion section is configured to guide and diffuse air, originating from the distribution opening and admitted to the surface of the main body via the inlet openings, to a reaction surface. To this end, the diffusion section includes dikes and channels to form air diffusion paths. A gasket applied to the surface of the separator's main body separates the distribution opening from the inlet openings.To be conveyed to the diffusion section, air is admitted from the diffusion orifice on the opposite face of the main body and passes through the main body via the intake openings.

[0003] A drawback of this known separator is that a different air flow rate is likely to be obtained from one channel to another in the diffusion section, particularly in the longer channels. This impacts the fuel cell efficiency, since this difference in flow rates means that part of the reaction surface is under-supplied with reactive fluid while another part is over-supplied. Consequently, the stoichiometry of the electrochemical reaction is not uniform. Resolving this difference in flow rates is not easy, since the distribution opening is generally eccentric with respect to the reaction surface, which means that the diffusion section necessarily forms longer channels than others in order to fluidly connect the entire width of the reaction surface to the diffusion opening.Furthermore, due to manufacturing constraints, it is not always easy to modify the geometry of the diffusion channel sections, as these generally need to be particularly fine to efficiently distribute the functional fluid to the reaction surface channels, or collect the functional fluid from the reaction surface channels. Indeed, the reaction surface channels are also very fine.

[0004] One of the aims of the invention is therefore to propose a new polar separator in which the flow of functional fluid is balanced from one side to the other of the circulation field.

[0005] To this end, the invention relates to a polar separator for an electrochemical cell, the polar separator comprising:

[0006] - a polar plate, comprising a distribution orifice and a plate face, to from which the distribution orifice passes through the polar plate from one side to the other, the plate face being parallel to a surface plane, the plate face comprising an injection rim, delimiting the distribution orifice, and a circulation field;

[0007] - conveying walls, forming a surface conveying field the plate face between the injection rim and the circulation field, the conveying walls being arranged side-by-side along the surface plane, so as to delimit conveying channels arranged side-by-side along the surface plane, each conveying channel being delimited between, and by, two of said conveying walls and guiding a conveyed portion of a functional fluid, from the injection rim to the circulation field, or from the circulation field to the injection rim, each conveying wall comprising:

[0008] • an internal routing end, each routing channel comprising an internal routing inlet bordered by two of the internal routing ends, and

[0009] • a main conveying section, which terminates at the inner end of routing, each routing channel comprising an intermediate routing portion bordered by two of the main routing portions;

[0010] - injection walls, forming an injection field on the surface of the face of plate between the injection rim and the conveying field, the injection walls being arranged side-by-side along the surface plane, so as to delimit injection channels arranged side-by-side along the surface plane, each injection channel being delimited between, and by, two of said injection walls and guiding an injected portion of the functional fluid, from the injection rim to the circulation field or vice versa, each injection wall comprising:

[0011] • an internal injection end, facing the internal ends of routing, each injection channel comprising an internal injection inlet bordered by two of the internal injection ends, and

[0012] • a main injection portion, which terminates with the internal injection end, each injection channel comprising an intermediate injection portion bordered by two of the main injection portions;

[0013] in which:

[0014] - the conveyance walls form:

[0015] • a first group, for which each internal routing entry delimited by The internal ends of the conveying walls have a reduced cross-section compared to the cross-section of the intermediate conveying portion, and

[0016] • a second group, for which each internal routing entry is delimited by the internal ends of the conveyance of these conveyance walls is of cross section equal to the cross section of the intermediate portion of the conveyance;

[0017] - the injection walls form:

[0018] • a first group, for which each internal injection entry delimited by the the internal injection ends of these injection walls has a reduced cross-section compared to the cross-section of the intermediate injection portion, and

[0019] • a second group, for which each internal injection inlet delimited by the internal injection ends of these injection walls has a cross-section equal to the cross-section of the intermediate injection portion.

[0020] One idea underlying the invention is to provide that only some of the delivery and injection channels have a local reduction in cross-section. This creates a pressure drop for these channels, reducing the flow rate for the portions of functional fluid passing through them. Thanks to this intentional pressure drop, the flow rates of the functional fluid portions can be easily rebalanced from one side of the separator to the other, in particular to ensure that the flow rate of functional fluid entering and / or leaving the circulation field is balanced across the entire width of the circulation field. The operation and efficiency of the electrochemical cell are thereby improved. Providing a local reduction in cross-section for both the delivery and injection fields allows for greater design freedom and maintains a simple manufacturing process.Indeed, while the channels in the delivery field are relatively thin, it is difficult to obtain any desired shape for the internal delivery ends or internal delivery inlets without using thicker delivery walls or resorting to a different manufacturing process. One idea underlying the invention is to provide a reduced cross-section at the internal injection inlet for some of the injection channels. This allows the aforementioned pressure drop task to be distributed between the delivery channels and the injection channels, while also creating, if necessary, a tortuous path at the boundary between the delivery field and the injection field, further reducing the functional fluid flow rate for the channels concerned. Furthermore, thanks to the invention, and in particular to the distribution of the pressure drop task between the injection channels and the other channels... For routing purposes, it is possible to use slightly less precise manufacturing processes than if the task were dedicated to only one type of channel, since it is not necessary to achieve an extremely narrow channel width. Thus, the cost and / or manufacturing time of the polar separator that is the subject of the invention is reduced.

[0021] According to other advantageous aspects of the invention, the invention comprises one or more of the following features, taken individually or in all technically possible combinations:

[0022] Preferably, for the first group of conveying walls, the internal conveying end has an increased width compared to the width of the main conveying part, so that the internal conveying entrance delimited by this internal conveying end has a reduced width compared to the width of the intermediate conveying portion.

[0023] Preferably, for the second group of conveying walls, the internal conveying end and the main conveying part are of the same width.

[0024] Preferably, for the first group of injection walls, the internal injection end has an increased width compared to the width of the main injection part, so that the internal injection inlet delimited by this internal injection end has a reduced width compared to the width of the intermediate injection portion.

[0025] Preferably, for the second group of injection walls, the internal injection end and the main injection part are of the same width.

[0026] Preferably, for at least some conveyance walls of the first group, the internal conveyance end: projects transversely from the main conveyance part, for a first side of the conveyance wall, and is aligned with the main conveyance part, for a second side of the conveyance wall.

[0027] Preferably, for at least some injection walls of the first group, the internal injection end: protrudes transversely from the main injection part, for a first side of the injection wall, and is aligned with the main injection part, for a second side of the injection wall.

[0028] Preferably, the respective first side of the conveying walls is directed opposite to the first side of the injection walls.

[0029] Preferably, the conveying walls of the first group are successive.

[0030] Preferably, the conveying walls of the second group are successive.

[0031] Preferably, the first group and the second group of conveying walls are arranged side by side.

[0032] Preferably, the injection walls of the first group are successive.

[0033] Preferably, the injection walls of the second group are successive.

[0034] Preferably, the first group and the second group of injection walls are arranged side by side.

[0035] Preferably, the internal conveying end of at least part of the conveying walls of the first group faces the internal injection end of at least part of the injection walls of the first group.

[0036] Preferably, the internal conveying end of at least part of the conveying walls of the second group faces the internal injection end of at least part of the injection walls of the second group.

[0037] Preferably, the number of conveying walls of the first group is: greater than 0.1 times the number of conveying walls of the second group, less than 1.0 times the number of conveying walls of the second group;

[0038] Preferably, the number of injection walls of the first group is: greater than 0.05 times the number of injection walls of the second group, less than 1.0 times the number of injection walls of the second group.

[0039] Preferably, for at least one of the internal routing inlets whose cross-section is reduced compared to the cross-section of the intermediate routing portion, the cross-section of the internal routing inlet is between 0.30 and 0.80 times the cross-section of the intermediate routing portion.

[0040] Preferably, for at least one of the internal injection inlets whose cross-section is reduced compared to the cross-section of the intermediate injection portion, the cross-section of the internal injection inlet is between 0.05 and 0.15 times the cross-section of the intermediate injection portion.

[0041] Preferably, for at least one of the internal injection inlets whose cross-section is reduced compared to the cross-section of the intermediate injection portion, the cross-section of this internal injection inlet is between 0.5 and 1.4 times the cross-section of at least one of the internal routing inlets whose cross-section is reduced compared to the cross-section of the intermediate routing portion.

[0042] Preferably, each conveying wall includes an external conveying end, the main conveying part ending with the external conveying end opposite the internal conveying end.

[0043] Preferably, for the conveying walls of the first group and the second group, the external conveying end and the main conveying part are of the same width.

[0044] Preferably, each injection wall comprises an external injection end, the main injection part ending with the external injection end opposite the internal injection end.

[0045] Preferably, for the injection walls of the first group and the second group, the external injection end and the main injection part are of the same width.

[0046] Preferably, the plate face includes a receiving location, connecting the injection rim to the circulation field.

[0047] Preferably, the polar separator includes a guide which is received at the receiving location, the guide being formed by a single monolithic piece of joint material comprising the conveying walls of the first group, the injection walls of the first group, at least some of the conveying walls of the second group and at least some of the injection walls of the second group.

[0048] Preferably, the guide includes an anchoring mat, to which each conveying wall and each injection wall formed by the guide is connected, so that these conveying walls, these injection walls and the anchoring mat together form the single monolithic piece of joint material, the anchoring mat extending beyond the surface plane from the conveying walls and the injection walls, so that said anchoring mat is housed in an anchoring cavity belonging to the receiving location, formed in a hollow by the plate face, thus anchoring the guide to the receiving location.

[0049] Preferably, each internal injection end of the injection walls of the first group and each internal conveying end of the conveying walls of the first group is arranged on the anchoring mat.

[0050] Preferably, at least some of the conveying walls of the second group are formed by the plate face and therefore belong to the polar plate.

[0051] Preferably, the injection rim includes a row of injection orifices, so that the functional fluid flowing on the surface of the plate face via the injection rim passes through the pole plate via the injection orifices to reach the distribution orifice, or so that the functional fluid flowing in the distribution orifice passes through the pole plate via the injection orifices of the injection rim to reach the plate face, at the injection rim.

[0052] Preferably, the injection field is arranged along the row of injection ports, between the row of injection ports and the conveying field, so that the injection field guides the conveyed portions of the functional fluid from the injection ports to the circulating field or vice versa.

[0053] The invention also relates to a fuel cell, comprising electrochemical cells, at least one of the electrochemical cells comprising:

[0054] - the polar separator as defined above, constituting a first separator polar;

[0055] - a second polar separator; and

[0056] - a membrane-electrode assembly, comprising an exchange zone which includes a proton exchange membrane,

[0057] electrochemical cell in which the first polar separator, the membrane-electrode assembly and the second polar separator are superimposed in a stacking direction, such that the membrane-electrode assembly is interposed between the first polar separator and the second polar separator, the circulation field of the polar plate of the first polar separator being in contact with the exchange zone in the stacking direction.

[0058] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0059] [Fig-1] The [Fig. 1] is a perspective view of a fuel cell according to an embodiment of the invention.

[0060] [Fig.2] The [Fig.2] is an exploded perspective view of an electrochemical cell belonging to the fuel cell of the [Fig.1].

[0061] [Fig.3] The [Fig.3] is a partial front view of a polar separator, showing a plate face belonging to a polar plate.

[0062] [Fig.4] The [Fig.4] is a view of a detail of the [Fig.3] according to frame IV.

[0063] [Fig.5] Fig.5 is similar to Fig.4, where only the polar plate is shown.

[0064] [Fig.6] The [Fig.6] includes a view (A) which is a partial section along the Vla-Vla line of the [Fig.5], a view (B) which is a partial section along the Vlb-VIb line of the [Fig.3] and a view (C) which is a partial section along the Vie-Vie line of the [Fig.3].

[0065] [Fig.7] The [Fig.7] includes a view (A) which is a partial section along line VIIa-VIIa of the [Fig.3] and a view (B) which is a partial section along line VIIb-VIIIb of the [Fig.3].

[0066] FUEL CELL 1 AND ELECTROCHEMICAL CELLS 4

[0067] Fig. 1 shows a fuel cell 1, comprising a stack 2 of electrochemical cells 4, and two terminal plates 3. The fuel cell 1 is preferably intended to equip a vehicle, in particular to electrically power an electric motor intended for the traction or propulsion of the vehicle, directly or indirectly (i.e. via a battery).

[0068] Stack 1 defines a longitudinal direction X, a transverse direction Y, and a stacking direction Z. As illustrated, each of these directions X, Y, and Z is oriented, that is, it is directed in a direction symbolized by an arrow in the figures. These directions are perpendicular to each other and distinct. Preferably, the transverse direction Y is directed upwards when the stack is in use.

[0069] The stack 2 is interposed between the two end plates 3 along the stacking direction Z and is sandwiched between said end plates 3. The stack 2 is supplied, advantageously via one of the end plates 3, with a primary reactive fluid, a secondary reactive fluid, and preferably a cooling fluid. Each of these fluids is a functional fluid. The primary and secondary reactive fluids react chemically within each cell 4 of the stack 2 to generate electricity. The primary and secondary reactive fluids, laden with reaction products, and the cooling fluid heated by the stack 2, are also discharged from the stack 2, for example via the same end plate 3.

[0070] The primary reactive fluid may be an anodic fluid, preferably a hydrogen-containing gas. The secondary reactive fluid may be a cathodic fluid, preferably an oxygen-containing gas, such as air. Alternatively, the primary reactive fluid is the cathodic fluid while the secondary reactive fluid is the anodic fluid. The cooling fluid is advantageously a coolant.

[0071] The stack 2 can comprise several hundred electrochemical cells 4. As shown in [Fig.2], each electrochemical cell 4 comprises, successively along the stacking direction Z, a polar separator 5, a membrane-electrode assembly 90, and a second polar separator 105.

[0072] Within each cell 4 a chemical reaction occurs between the primary and secondary reactive fluids, creating an electrical potential difference between the polar separator 5 and the second polar separator 105. Here, for each cell 4, the polar separator 5 is an anodic separator while the second polar separator 105 is a cathodic separator, but the reverse could be expected.

[0073] MEMBRANE-ELECTRODE ASSEMBLY 90

[0074] The membrane-electrode assembly 90 has a general plate shape, extending along a plane perpendicular to the stacking direction Z. The membrane-electrode assembly 90 is superimposed with the polar separator 5 of the same cell 4, along the stacking direction Z, i.e., the membrane-electrode assembly 90 and the polar separator 5 are stacked along the Z direction, in particular with their respective contours overlapping. Thus superimposed, the membrane-electrode assembly 90 is arranged in the stacking direction Z with respect to the polar separator 5. The second polar separator 105 is superimposed with the membrane-electrode assembly 90 of the same cell 4 along the stacking direction Z, i.e., the membrane-electrode assembly 90 and the second polar separator 105 are stacked along the Z direction, in particular with their respective contours overlapping. Thus superimposed, the second polar separator 105 is arranged in the stacking direction Z with respect to the membrane-electrode assembly 90 and with respect to the polar separator 5 of the same cell 4. In other words, for each cell 4, the membrane-electrode assembly 90 is interposed between the polar separator 5 and the second polar separator 105 along the Z direction. In addition, the second polar separator 105 of a previous cell 4 of the stacking 2 is superimposed with the separator 5 of the next cell 4, along the stacking direction Z, and so on.

[0075] The membrane-electrode assembly 90 has a face 91, turned in the opposite direction to the stacking direction Z towards the immediately adjacent polar separator 5, belonging to the same cell 4. The membrane-electrode assembly 90 has a face 92, turned along the Z direction towards the second immediately adjacent polar separator 105.

[0076] The membrane-electrode assembly 90 comprises a peripheral zone 97 and an exchange zone 93, surrounded by the peripheral zone. The face 91 is formed by the peripheral zone 97 and the exchange zone 93. The face 92 is also formed by the peripheral zone 97 and the exchange zone 93, on the opposite side along the Z direction.

[0077] Preferably, the membrane-electrode assembly 90 is symmetrical in shape around an axis of symmetry parallel to the Z direction.

[0078] The exchange zone 93, also called the active zone, comprises a proton exchange membrane, which is advantageously covered, on the side of face 91, by a gas diffusion layer, and on the side of face 92, by another gas diffusion layer, belonging to the exchange zone 93. The membrane is thus interposed between the two gas diffusion layers. Preferably, all or virtually all of the exchange zone 93 is occupied by the proton exchange membrane.

[0079] The peripheral zone 97 forms an outer contour of the assembly 90. The peripheral zone 97 is coplanar with the exchange zone 93, in particular with the membrane, extending in a plane perpendicular to the Z direction.

[0080] The peripheral zone 97 can be made of the same material as the proton exchange membrane, by extending said membrane beyond the gas diffusion layers, if any, so that the peripheral zone 97 is not covered by the gas diffusion layers. Alternatively, the peripheral zone 97 consists of a retaining frame, which surrounds the membrane on its entire periphery and is assembled with said membrane. The retaining frame is, for example, formed by two superimposed polymer films along the Z-stack direction. The gas diffusion layers, if any, can locally cover the support frame, that is to say, extending slightly beyond the membrane, at the boundary between the membrane and the support frame.

[0081] The membrane-electrode assembly 90 also includes distribution ports 95H, 96H, 950, 960, 95C and 96C, provided through the peripheral zone 97. Each port 95H, 96H, 950, 960, 95C and 96C connects face 91 to face 92.

[0082] Port 95H is a feed port belonging to a feed gallery formed through stack 2 along the Z direction and configured to be traversed, along the Z direction, by the primary reactive fluid to feed stack 2. As such, port 95H is itself traversed by the primary reactive fluid. Port 96H is a discharge port belonging to a discharge gallery formed through stack 2 along the Z direction and configured to be traversed, along the Z direction, by a mixture of primary reactive fluid and reaction products from stack 2. As such, port 96H is itself traversed by the mixture. Ports 95H and 96H are located on either side of the exchange zone 93.

[0083] Port 950 is a feed port belonging to a feed gallery formed through stack 2 along the Z direction and configured to be traversed, along the Z direction, by the secondary reactive fluid to feed stack 2. As such, port 950 is itself traversed by the secondary reactive fluid. Port 960 is a discharge port belonging to a discharge gallery formed through stack 2 along the Z direction and configured to be traversed, along the Z direction, by a mixture of secondary reactive fluid and reaction products from stack 2. As such, port 960 is itself traversed by the mixture. Ports 950 and 960 are located on either side of the exchange zone 93.

[0084] Port 95C is a supply port belonging to a supply gallery formed through stack 2 along the Z direction and configured to be traversed, along the Z direction, by the cooling fluid to supply stack 2. As such, port 95C itself is traversed by the cooling fluid. Port 96C is a discharge port belonging to a discharge gallery formed through stack 2 along the Z direction and configured to be traversed, along the Z direction, by cooling fluid from stack 2. As such, port 96C itself is traversed by the cooling fluid. Ports 95C and 96C are located on either side of the heat exchange zone 93.

[0085] POLAR SEPARATORS 5, 105

[0086] The second polar separator 105 comprises a plate face 1110, through which it is superimposed on the membrane-electrode assembly 90, against face 92, and an opposite plate face 11 IC. Faces 1110 and 11 IC are opposite and perpendicular to the Z direction. The second polar separator 105 includes distribution ports 115H, 116H, 115C, 116C, 1150 and 1160, each distribution port passing through the separator 105 by connecting plate face 1110 to plate face 11 IC. The orifices 115H, 116H, 115C, 116C, 1150 and 1160 are respectively superimposed with the orifices 95H, 96H, 95C, 96C, 950 and 960 of the membrane-electrode assembly 90 along the Z direction, to extend the galleries formed by the orifices 95H, 96H, 95C, 96C, 950 and 960 and to be traversed by the same functional fluids.

[0087] The polar separator 5, includes a polar plate 10, with a plate face 11H, turned along the Z direction and shown in more detail in figures 3 to 5. The polar plate 10 includes a plate face 1 IC opposite to the plate face 11H.

[0088] Preferably, the polar separator 5, or at least the polar plate 10, is symmetrical in shape around an axis of symmetry parallel to the Z direction.

[0089] Preferably, the pole plate 10 is formed in one piece from a sheet or plate. The pole plate 10 is advantageously made of an electrically conductive metal, such as titanium or stainless steel, but may alternatively be made of graphite. Preferably, the pole plate 10 is entirely obtained by stamping the sheet or plate. Alternatively, or in addition, the plate 10 may have been machined.

[0090] The plate face 11H extends, in general, along a surface plane PI 1H, shown in the partial sections of Figures 6 and 7 and being perpendicular to the Z direction. The plate face 1 IC extends, in general, along a surface plane PI IC, shown in the partial sections of Figures 6 and 7, and being perpendicular to the Z direction and parallel to the plane PI 1H.

[0091] As shown in particular in [Fig. 2], the pole plate 10 comprises distribution ports 15H, 16H, 15C, 16C, 150 and 160, each distribution port passing through the plate 10 and connecting the plate face 11H to the plate face 1IC. In particular, each port 15H, 16H, 15C, 16C, 150 and 160 connects a peripheral area 23H belonging to the face 11H to a corresponding peripheral area belonging to the face 11C. Preferably, the ports 15H, 15C and 150 are arranged at one end of the plate 10 along the X direction, while the ports 16H, 16C and 160 are arranged at an opposite end. Port 15C is preferably located between ports 15H and 150, along the Y direction. Port 15H is preferably positioned in the Y direction relative to ports 15C and 150. Port 16C is preferably located between ports 160 and 16H, along the Y direction.Port 160 is preferentially positioned in the Y direction relative to ports 16C and 16H.

[0092] The orifices 15H, 16H, 15C, 16C, 150 and 160 are respectively superimposed with the orifices 95H, 96H, 95C, 96C, 950 and 960 of the membrane-electrode assembly 90 along the Z direction.

[0093] Port 15H is a feed port, belonging to the same feed gallery as port 95H. As such, port 15H is itself traversed by the primary reactive fluid. Port 16H is a discharge port, belonging to the same discharge gallery as port 96H. As such, port 16H is itself traversed by the mixture.

[0094] Port 150 is a feed port, belonging to the same feed gallery as port 950. As such, port 150 is itself traversed by the secondary reactive fluid. Port 160 is a discharge port, belonging to the same discharge gallery as port 960. As such, port 160 is itself traversed by the mixture.

[0095] Alternatively, the cathodic fluid, i.e., air, is supplied through port 160, and port 150 is an exhaust port. In other words, ports 150 and 160 can be used interchangeably for supplying or exhausting gases.

[0096] Port 15C is a supply port, belonging to the same gallery as port 95C. As such, port 15C is itself traversed by the cooling fluid. Port 16C is a drain port, belonging to the same drain gallery as port 96C. As such, port 16C is itself traversed by the cooling fluid.

[0097] Alternatively, the coolant is supplied through port 16C and port 15C is a discharge port. In other words, ports 15C and 16C can be used interchangeably for supplying or discharging coolant.

[0098] The polar plate 10 is described here in more detail with regard to the plate face 11H.

[0099] As shown in [Fig. 2], the plate face 11H is opposite the face 91 of the membrane-electrode assembly 90 of the same cell 4 of stack 2.

[0100] On the side of the plate face 11H, the polar plate 10 mainly comprises a circulation field 20H, two conveying fields 21H and 22H, two injection fields 37H and 38H, the aforementioned peripheral zone 23H, a joint 24H and two injection edges 25H and 26H. Advantageously, two anchoring cavity backs 27H and 28H may be provided.

[0101] The peripheral zone 23H is formed directly by the face 11H of the polar plate 10. The peripheral zone 23H encloses the circulation field 20H, the delivery fields 21H and 22H, the injection fields 37H and 38H, and the injection edges 25H and 26H. The peripheral zone 23H has a frame-like shape, in forming a closed loop which entirely forms a peripheral contour of face 11H and plate 10, for example of general rectangular shape.

[0102] The circulation field 20H is preferably arranged in the center of the face 11H. Along the X direction, the circulation field 20H is arranged between the routing fields 21H and 22H, which are located at opposite ends of the circulation field 20H. The field 20H thus connects the fields 21H and 22H.

[0103] Along the X direction, the delivery field 21H is arranged between the circulation field 20H and the orifices 15H, 15C, and 150. Along the X direction, the injection field 37H is arranged between the orifice 15H and the circulation field 20H. In particular, the circulation field 20H begins at one end of the delivery field 21H. The end of the delivery field 21H on this side extends along an axis Y21H, called the "external delivery axis," parallel to the plane PI1H and preferably parallel to the Y direction. The injection field 37H begins at an opposite end of the delivery field 21H. The end of the routing field 21H on this side extends along an axis R21H, called the "internal routing axis", parallel to the plane PI 1H and preferentially oblique to the X and Y directions.The end of the injection field 37H on this side extends along an axis R37H, called the "internal injection axis," parallel to the plane PI1H and preferably oblique to the X and Y directions. Preferably, the axes R37H and R21H are parallel and separated, with the axis R37H in the X direction relative to the axis R21H. At an opposite end of the injection field 37H, the injection rim 25H, belonging to the peripheral zone 23H, connects the orifice 15H to the injection field 37H. Preferably, this other end of the injection field 37H is also parallel to the axis R37H. The injection rim 25H extends to the orifice 15H; that is, the rim 25H delimits the orifice 15H for a portion of its contour. The cavity back 27H is positioned so as to be adjacent to the routing field 21H and the ports 15C and 150, being surrounded by the routing field 21H and the ports 15C and 150.

[0104] As shown in Figures 4 and 5, the conveying field 21H is, in the first part, formed by a separate conveying field 39H and, in the second part, formed by an integrated conveying field 70H. The separate conveying fields 39H and 70H are arranged side by side, and each connects the circulation field 20H to the injection field 38H. The function of these separate conveying fields 39H and 70H is, in particular, to convey fluid from the injection field 37H to the circulation field 20H in the most homogeneous manner possible. The separate conveying field 39H is delimited, along the X direction, by the circulation field 20H, where the end of the field 39H extends along the Y21H axis. The conveying field The reported 39H is delimited, in the opposite direction to X, by the injection field 37H, where the end of field 39H advantageously extends along axis R21H. The reported 39H routing field is delimited, along the Y direction, by the integrated routing field 70H and a main closed loop 31H of the joint 24H, described below. The integrated routing field 70H is delimited, along the X direction, by the circulation field 20H, where the end of field 70H extends along axis Y21H, i.e., in line with the end of field 39H. The integrated delivery field 70H is delimited by the injection field 37H, where the end of the field 70H advantageously extends along the axis R21H, in line with the end of the field 39H along this axis R21H. In the Y direction, the integrated delivery field 70H is delimited by the cavity back 27H and by the added delivery field 39H.The 39H and 70H routing fields therefore connect the 20H circulation and 37H injection fields by being arranged side by side.

[0105] Arrangements symmetrical to those of the delivery field 21H and injection field 37H apply to the delivery field 22H and injection field 38H. In particular, along the X direction, the delivery field 22H is arranged between the circulation field 20H and the ports 16H, 16C, and 160. Along the X direction, the injection field 38H is arranged between the circulation field 20H and the port 16H. In particular, the circulation field 20H terminates at one end of the delivery field 22H. The injection field 38H begins at the opposite end of the delivery field 22H. At one opposite end of the injection field 38H, the injection rim 26H, belonging to the peripheral zone 23H, connects the delivery field 22H to the orifice 16H. The injection rim 26H extends to the orifice 16H, that is to say that the rim 26H delimits the orifice 16H, for part of the contour of the orifice 16H.The cavity back 28H is arranged so as to be adjacent to the routing field 22H and to the ports 16C and 160. The routing field 22H advantageously comprises a reported routing field and an integrated routing field, symmetrically to that described by the routing field 21.

[0106] Each injection rim 25H and 26H is preferably formed directly by the face 11H. Preferably, each injection rim 25H and 26H comprises a row of injection ports, which connect the faces 11H and 1 IC to each other. Preferably, each injection rim 25H and 26H extends along the plane PI 1H, at least at the location of the injection ports, and preferably, from each injection port to the adjacent injection field 37H or 38H.

[0107] As shown in Figures 3 to 5, the injection rim 25H comprises injection orifices 29H, for example arranged in a row extending along the distribution orifice 15H. The row of orifices 29H extends along an axis R29H, which is parallel to the plane PI 1H and advantageously oblique to the X and Y directions. Preferably, the R29H axis is parallel to the R37H axis. Along the X direction, the injection ports 29H are arranged between the injection field 37H and the port 15H. The injection field 37H is arranged along the row of injection ports 29H, along the R29H axis. The injection field 37H is arranged between the row of ports 29H and the delivery field 21H, so as to connect them. In particular, the injection field 37H connects the row of ports 29H to both the integrated delivery field 70H and the added delivery field 39H. The injection ports of the injection rim 26H are arranged similarly along the distribution port 16H. The injection field 38H thus connects these injection ports to the delivery field 22H.

[0108] The polar separator 5 is configured so that the primary reactive fluid flowing in the orifice 15H is admitted between the face 11H and the face 91 via the injection rim 25H, and then discharged through the orifice 16H via the injection rim 26H. In doing so, the primary reactive fluid flows along the face 11H, successively along the injection rim 25H, the injection field 37H, the conveying field 21H, the circulation field 20H, the conveying field 22H, the injection field 38H and the injection rim 26H.

[0109] As it flows along the injection field 37H, the primary reactive fluid divides into several portions of primary fluid, called "injected portions", each guided in parallel by the injection field 37H.

[0110] As it flows along the conveying field 21H, the primary reactive fluid is divided into portions of the primary fluid, called "conveyed portions" of the primary reactive fluid, some conveyed portions being guided by the added conveying field 39H and the other conveyed portions being guided by the integrated conveying field 70H. The conveyed portions of the primary reactive fluid guided by the field 39H do not pass through the field 70H and vice versa, i.e. that the fields 39H and 70H are in parallel with each other.

[0111] The primary reactive fluid admitted onto the surface of plate face 11H from orifice 15H flows first along face 11C, from orifice 15H to orifices 29H, then passes through plate 10 via orifices 29H to reach face 11H at the injection rim 25H, then reaches the injection field 37H from the injection rim 25H, and finally the delivery field 21H from the injection field 37H. The primary reactive fluid to be discharged from face 11H to orifice 16H reaches the injection field 38H from the delivery field 22H, then the injection rim 26H, and finally passes through the injection orifices of the rim. 25H to pass from face 11H to face 1 IC, then is evacuated through orifice 16H on the side of face 11C.

[0112] 24H SEAL OF THE POLAR SEPARATOR 5

[0113] The seal 24H, shown in dashed lines in [Fig. 2] and illustrated in more detail in [Fig. 3] to 5, is received on the plate face 11H, in particular, is entirely received on the peripheral area 23H. Preferably, over the entire portion of the peripheral area 23H receiving the seal 24H, said seal 24H is received on a surface of the peripheral area 23H that extends along the face plane PI 1H. The seal 24H protrudes from the face plane PI 1H in the Z direction. In the Z direction, the seal 24H comes into contact with the face 91 of the membrane-electrode assembly 90, in particular with the peripheral area 97. The seal 24H thus delimits areas sealed against functional fluids between the faces 11H and 91, preventing said functional fluids from escaping peripherally.

[0114] The 24H seal is preferably formed in one piece. The 24H seal is made of a sealing material, i.e., for example, an elastomer. The 24H seal is preferably obtained by overmolding said 24H seal directly onto face 11H, or alternatively onto face 91. Alternatively, the 24H seal can be manufactured separately and then attached to face 11H, or alternatively to face 91.

[0115] The 24H seal includes a main closed loop 31H, formed on face 11H, or at least interposed between face 11H and face 91. The main closed loop 31H serves to keep the primary reactive fluid circulating along face 11H within the main closed loop 31H, between faces 11H and 91. On the side of face 11H, the main closed loop 31H surrounds at least the circulation field 20H, the injection fields 37H and 38H, and the delivery fields 21H and 22H. On the side of face 91, the closed loop surrounds the exchange zone 93.

[0116] Advantageously, ports 15H, 15C, 150, 16H, 16C, and 160 are arranged outside the main closed loop 31H, as shown in Figures 2 to 4, since the injection rims 25H and 26H have injection ports such as ports 29H. Similarly, ports 95H, 95C, 950, 96H, 96C, and 960 are arranged outside the main closed loop 31H. As shown for the injection ports 29H in [Fig. 4], the injection ports of the injection rims 25H and 26H are arranged inside the main closed loop 31H. Therefore, all the primary reactive fluid circulating on the surface of face 11H is surrounded by the main closed loop 31H, preventing said primary reactive fluid from escaping to the periphery of face 11H. More precisely, the main closed loop 31H comprises, for each injection rim 25H and 26H, a respective rim portion.For the 25H injection rim, it is a part of the 32H rim. shown in [Fig. 4]. Each rim portion is received on the plate face 11H, just like the rest of the main closed loop 31H. The rim portion 32H is received on the injection rim 25H, between the distribution orifice 15H and the row of injection orifices 29H, in order to separate orifice 15H from the orifices 29H. The orifice 15H is therefore outside the main closed loop 31H, and the orifices 29H are inside the closed loop. Preferably, the rim portion 32H is parallel to the axis R29H. Similarly, the other rim portion is received on the injection rim 26H, between the distribution orifice 16H and the row of injection orifices of this injection rim 26H, in order to separate orifice 16H from said injection orifices. The 16H orifice is therefore outside the main closed loop 31H and the rim injection orifices 26H are inside the closed loop.

[0117] Preferably, the 24H seal comprises secondary closed loops, each surrounding one of the distribution ports and received on the plate face 11H. Each secondary closed loop contacts the face 91 in the Z direction, so as to be interposed between the face 11H and the face 91. Preferably, each secondary loop is formed as a single unit with the main closed loop 31H. Preferably, each port 15H, 15C, 150, 16H, 16C, and 160 is surrounded by a respective secondary closed loop belonging to the 24H seal. Since each secondary loop is also in contact with the face 91, each port 95H, 95C, 950, 96H, 96C, and 960 is also surrounded by one of the respective secondary loops. Each secondary loop therefore connects, along the Z direction, one of the orifices 15H, 15C, 150, 16H, 16C and 160 to the orifice 95H, 95C, 950, 96H, 96C or 960 which is superimposed on it, to form the corresponding gallery.Each secondary loop thus ensures that the functional fluid circulating in the gallery concerned does not escape out of cell 4, nor into the interior of the main closed loop 31 H, except in the presence of one of the injection rims, as is the case for orifices 15H and 16H. .

[0118] As shown in [Fig. 3], in particular, a secondary closed loop 33H surrounds the orifice 15H, a secondary closed loop 33C surrounds the orifice 15C, and a secondary closed loop 330 surrounds the orifice 150. As shown in [Fig. 3], the secondary closed loops 33H, 33C, and 330 and the primary closed loop 31H advantageously have common parts. For example, the primary closed loop 31H and the secondary loop 33H share the rim portion 32H. The same considerations apply to the secondary loops surrounding the orifices 16H, 16C, and 160, respectively.

[0119] Preferably, no part of the 24H seal subdivides the closed loop(s) into several closed loops formed by the 24H seal.

[0120] 20H CIRCULATION FIELD OF THE POLAR SEPARATOR 5

[0121] Preferably, the traffic area 20H is formed directly by the plate face 11H. Preferably, the traffic area 20H has a generally rectangular shape along the X and Y directions. The traffic area 20H includes walls, which are raised along the Z direction relative to the face plane PI 1H. Preferably, each wall of the traffic area 20H connects the two ends of the traffic area 20H along the X direction, i.e., it extends from area 21H to area 22H. The walls are arranged side-by-side so as to delimit channels between them, each channel being located between two successive walls. Between two successive walls, the channel is delimited by a channel bottom formed by the face 11H, preferably offset in the opposite direction to the Z axis relative to the face plane PI 1H. Each channel connects area 21H to area 22H.Preferably, the 20H traffic area is formed by stamping plate 10, the stamping allowing the walls and channels to be raised.

[0122] Along the Z direction, the circulation field 20H, in particular each wall, comes to rest against the exchange zone 93 of the membrane-electrode assembly 90, being superimposed with the exchange zone 93. Preferably, the circulation field 20H is in rest against the exchange zone 93 over its entire surface, or the exchange zone 93 is in rest against the circulation field 20H over its entire surface.

[0123] The primary reactive fluid flowing along face 11H is admitted along circulation field 20H from delivery field 21H and flows to the opposite end of circulation field 20H via the channels of said circulation field 20H, being guided by said channels and distributed over said channels. At the opposite end of circulation field 20H, the primary reactive fluid is admitted into delivery field 22H. During its flow along field 20H, the primary reactive fluid comes into contact with the exchange zone 93, where the reaction occurs across the proton exchange membrane, generating an electrical potential difference between separators 5 and 105.

[0124] INTEGRATED CONVEYING FIELD 70H OF THE POLAR SEPARATOR 5

[0125] As shown in Figures 3 to 5, the integrated conveying field 70H comprises walls 72H, referred to as "integrated conveying walls". The walls 72H are arranged side-by-side along the surface plane PI 1H, so as to delimit channels 77H, referred to as "integrated conveying channels". Each integrated conveying channel 77H is delimited between, and by, two of said walls 72H. Each channel 77H guides one of the respective conveyed portions of the primary reactive fluid from the injected field 37H to the circulation field 20H. This circulation of the routed portions guided by the integrated routing field 70H takes place in a bypass relative to the routed portions guided by the reported routing field 39H, that is to say that the routed portions circulating in the integrated routing field 70H do not circulate in the reported routing field 39H and that the routed portions circulating in the reported routing field 39H do not circulate in the integrated routing field 70H.

[0126] In particular, the walls 72H are arranged side-by-side and spaced apart along the surface plane PI 1H, distributed transversely with respect to the axis R21H. Each wall 72H connects the injection field 37H to the circulation field 20H. As can be seen in view B of [Fig. 6], along the Z direction, each wall 72H projects from the plane PI 1H and is connected to each other by a portion of the plate face 11H, namely the receiving surface 41H, which is coplanar with the plane PI 1H and forms the bottom of the channel 77H in question. Along the Z direction, each wall 72H may abut the face 91, in particular the peripheral zone 97, preferably along the entire length of the wall 72H. The integrated conveying channels 77H are therefore also delimited, along the Z direction, by the face 91. Preferably, the walls 72H are not in contact with the exchange zone 93.

[0127] Each wall 72H comprises a main section 80H, referred to as the "integrated main conveying section," an end 81H, referred to as the "integrated inner conveying end," and an end 82H, referred to as the "integrated outer conveying end." The main section 80H connects the end 81H to the end 82H, preferably without interruption, and preferably such that the wall 72H is unbranched from the end 81H to the end 82H. In other words, the main section 80H terminates at the end 81H and the end 82H, opposite each other. The end 81H is directed toward the distribution orifice 15H, so as to face the injection field 37H, preferably without an intermediary. The 82H end is directed towards the 20H traffic field, so as to face the 20H traffic field, preferably without intermediary.

[0128] The ends 81H are preferably arranged to be aligned along the internal routing axis R21H. Preferably, the ends 82H are arranged to be aligned along the Y21H axis. This allows for a homogeneous distribution of the functional fluid flow while optimizing the available space in the routing field 21H.

[0129] Each channel 77H includes an input 78H, called the "integrated internal routing input", an input 79H, called the "integrated external routing input" and an intermediate portion 85H, called the "integrated intermediate routing portion".

[0130] Each inlet 78H is bordered by two of the ends 81H. Between the ends 81H, the inlet 78H is also delimited by the portion of the plate face 11H that connects the walls 72H delimiting the channel 77H concerned. Preferably, each inlet 78H, or most of the inlets 78H, faces the injection field 37H. Each inlet 79H is bordered by two of the 82H endpoints. Between the 82H endpoints, the 79H entrance is also delimited by the portion of the 11H plate face that connects the 72H walls delimiting the relevant 77H channel. Preferably, each 79H entrance, or most of the 79H entrances, faces the 20H traffic area. The intermediate portion 85H connects the 78H entrance to the 79H entrance, preferably in a non-branching manner, being bordered by the main 80H sections of the 72H walls. In other words, the intermediate portion 85H terminates at the 78H and 79H entrances. Between the main 80H sections, the intermediate portion 85H is also delimited by the portion of the 11H plate face that connects the 72H walls delimiting the relevant 77H channel.

[0131] In operation, the portion of the primary reactive fluid conveyed by channel 77H is admitted into channel 77H at inlet 78H from injection field 37H, flows along the intermediate portion 85H, and is discharged to the circulation field 20H via inlet 79H. The walls 72H thus serve to guide the conveyed portions of the primary reactive fluid. In particular, the main portion 80H of the walls 72H guides the fluid from inlet 78H to inlet 79H. The primary reactive fluid, thus guided by field 70H, flows from the distribution orifice 15H to the circulation field 20H, circulating on the surface of face 11H, after passing through the injection orifices 29H, via the injection rim 25H and via the injection field 37H.

[0132] Regarding the other integrated conveying field, belonging to conveying field 22H, each integrated conveying channel ensures the guidance of one of the respective conveyed portions of the primary reactive fluid from the circulation field 20H to the injection field 38H. Apart from this difference in the direction of flow, preferably, the same provisions as for conveying field 70H apply symmetrically.

[0133] Preferably, from end 81H to end 82H, the wall 72H has a constant height, measured along the Z direction. Advantageously, for each wall 72H, end 81H, the main section 80H, and end 82H are of equal width, the width being measured parallel to plane PI 1H and transversely to wall 72H. It follows that each internal conveyance inlet 78H, delimited by the internal ends 81H of these conveyance walls 72H, has a cross-section equal to the cross-section of the intermediate conveyance section 85H, the cross-section being measured perpendicular to the wall bordering the measured channel and parallel to the Z direction.

[0134] Preferably, for all the walls 72H, the ends 81H and 82H and the main part 80H are of equal width in that, for each of the two opposite sides of the wall 72H considered, the ends 81H and 82H are aligned with the main part 80H, that is to say they do not protrude transversely from it.

[0135] Preferably, the walls 72H are designed to be straight from end 81H to end 82H and parallel to each other, so that the channels 77H are each straight and of constant width. This limits the fluidic disturbances that would be induced by any change in the width of the channels 77H.

[0136] Preferably, the ends 81H, 82H and the main part of each wall 72H are of the same width as the ends 81H, 82H and the main part of the other walls 72H. By "width" is meant a dimension measured along the plane PI 1H perpendicular to the wall 72H.

[0137] Preferably, for the integrated conveying field 70H, the inlets 78H and 79H and the intermediate portion 85H of the same channel 77H are of the same width. Preferably, the inlets 78H and 79H and the intermediate portion 85H of the channel 77H closest to the conveying field 39H are narrower than the inlets 78H and 79H and the intermediate portion 85H of the channel 77H furthest from the conveying field 39H. Preferably, a gradual increase in channel width is provided, from the channel 77H closest to the field 39H to the furthest channel 77H. "Width" means a dimension measured along plane PI 1H perpendicular to one of the walls 72H bordering the measured channel 77H.This gradual increase in the width of the 77H channels advantageously ensures the most homogeneous distribution possible of the primary reactive fluid in the 20H circulation field, the shorter 77H channels being narrower than the longer 77H channels.

[0138] 40H RECEPTION LOCATION AND 50H POLAR SEPARATOR GUIDE

[0139] As shown in Figures 3 to 5, the attached delivery field 39H and the injection field 37H, referred to as the "attached injection field," are formed partly by a receiving location 40H formed by the plate face 11H, i.e., formed directly by the plate 10, and partly by a guide 50H, which is a separate part of the plate 10, attached or applied to the plate face 11H, in particular, received on the receiving location 40H. The receiving location 40H is more clearly visible in [Fig. 5] where the joint 24H, including the guide 50H, is omitted. Preferably, the receiving location 40H is formed entirely by the face 11H.

[0140] The receiving location 40H includes a second receiving surface 41H, an anchoring cavity 42H and a first receiving surface 46H, which are formed directly by the face 11H.

[0141] The receiving location 40H connects the injection rim 25H, along the entire length of the injection rim 25H, or along the entire row of injection ports Location 29H, within the 20H circulation field, covers only a portion of the width of the 20H circulation field along the Y direction, the other portion of the 20H circulation field's width being served by the integrated 70H routing field. Location 40H is also bounded by the integrated 70H routing field and the main closed loop 31H. In other words, location 40H occupies the entire area of ​​the reported 39H routing field and the reported 37H injection field.

[0142] As can be seen in view A of [Fig. 6], the receiving surfaces 41H and 46H extend along, i.e., are coplanar with, the surface plane P11H. The receiving surfaces 41H and 46H are preferably completely planar along the surface plane P11H. The receiving surfaces 41H and 46H are thus advantageously coplanar with the bottom of the channels of the circulation field 20H, unless the bottom of the channels of the circulation field 20H is recessed relative to the surface plane P11H. The receiving surfaces 41H and 46H are advantageously coplanar with the injection rim 25H, preferably at least for the parts of the injection rim 25H that connect the injection field 37H to the orifices 29H. The receiving surfaces 41H and 46H are advantageously coplanar with the peripheral zone 23H, preferably at least with the parts of the peripheral zone 23H on which the joint 24H is applied.This coplanar arrangement of the receiving surfaces 41H and 46H advantageously facilitates the formation of the guide 50H directly on the face 11H, in particular by overmolding, especially simultaneously with the overmolding of the seal 24H if the seal 24H is also overmolded.

[0143] As can be seen in Figures 4 and 5, along plane PI 1H, cavity 42H advantageously connects surface 46H to surface 41H so as to be bordered on both sides by surfaces 46H and 41H. Cavity 42H is therefore arranged between surfaces 46H and 41H. Cavity 42H is arranged between the row of injection ports 29H and the flow field 20H. More broadly, cavity 42H is arranged between port 15H and the flow field 20H. As can be seen in view A of [Fig. 6], the anchoring cavity 42H is formed in a hollow from surfaces 41H and 46H, in the opposite direction to the Z direction. In other words, cavity 42H is hollow beyond plane PI 1H. Preferably, the cavity 42H includes a bottom 45H, which is preferably flat, parallel to the plane PI 1H and which extends over almost the entire area of ​​the cavity 42H in projection into the plane PI 1H.The PI IC plane is preferentially arranged between the 45H bottom and the PI 1H plane, along the Z direction, as seen in [Fig. 6]. The 42H cavity is therefore advantageously deeper than the thickness of the polar plate 10.

[0144] As shown in figures 3 to 5, in the opposite direction to X, the receiving surface 41H extends to the traffic field 20H, preferably over the part of the width of the traffic field 20H not occupied by the routing field 70H. Along the X direction, the receiving surface 41H extends to the anchoring cavity 42H over a portion of the width of the anchoring cavity 42H along the Y direction. Along the X direction, the field 70H extends to the other portion of the width of the anchoring cavity. In the opposite direction to Y, the receiving surface 41H advantageously extends to the routing field 70H, preferably along its entire length. In other words, the receiving surface 41H connects the anchoring cavity 42H to the circulation field 20H next to the integrated routing field 70H. The receiving surface 41H is entirely located within the main closed loop 31H.

[0145] As shown in Figures 3 to 5, in the opposite direction to X, the receiving surface 46H extends to the cavity 42H, preferably over the entire width of the cavity 42H along the Y direction. Along the X direction, the receiving surface 46H extends to the injection rim 25H, preferably over the entire width of the injection rim 25H measured along the Y direction, or at least over the entire width of the row of injection orifices 29H, measured along the Y direction. Along the Y direction, the receiving surface 46H connects one part of the main closed loop 31H to another, on either side of the row of orifices 29H. The orifices 29H are thus framed by the rim part 32H of the main closed loop 31H and by the receiving surface 46H along the Y direction. The receiving surface 46H is entirely disposed inside the main closed loop 31H.

[0146] The anchoring cavity 42H advantageously has, on the injection rim 25H side, an edge 43H, the surface 46H being contiguous to the cavity 42H along the edge 43H, and, on the circulation field 20H side, an edge 44H, the surface 41H being contiguous to the cavity 42H along the edge 44H. The edges 43H and 44H delimit the cavity 42H, connecting the bottom 45H to the surfaces 46H and 41H respectively, along the Z direction. The edges 43H and 44H delimit the cavity 42H from each other, along the X direction. Preferably, the edge 43H is straight and parallel to the axis R37H. The 44H edge is preferentially tiered, comprising, along the entire 70H routing field, a part coaxial with, or parallel and close to, the R37H axis, and comprising, along the entire 39H routing field, a part parallel to the R37H axis and further away from the R37H axis.

[0147] Preferably, the location 40H is formed by stamping the plate 10, advantageously at the same time as the stamping forms other parts of the plate 10, such as the field 20H, but also any integrated routing field, in particular the integrated routing field 70H. In particular, in the case of stamping, so that the plate 10 forms the cavity 42H, formed in relief by the face 11H, the plate 10 also preferably forms, correspondingly, an anchoring cavity back 27C, formed in relief by the face 1IC, in the opposite direction. Z. Back 27C is visible in view (A) of [Fig. 6]. Back 27C has the same shape as cavity 42H, but in negative, meaning it is raised rather than recessed. The back of anchoring cavity 27C protrudes in the opposite direction to Z, relative to the surface plane PI IC. Back 27H, which is, for example, the result of an anchoring cavity formed in a recess on face 1 IC, is located on face 11H in an area that does not interfere with the functional elements of face 11H, as described above. Indeed, the functional fluid is thus not disturbed by the presence of this back 27H since it is located in an area not reached by said functional fluid.

[0148] The waveguide 50H is complementary to the receiving location 40H and is configured to be received at the receiving location 40H as shown in Figures 3 and 4. Similarly, the receiving location 40H is complementary to the waveguide 50H and is designed to receive the waveguide 50H. The pole plate 10 and the waveguide 50H are therefore linked and represent a common inventive concept of forming the reported delivery field 39H and the reported injection field 37H. The waveguide 50H is surrounded by the main closed loop 31H.

[0149] The 50H guide is formed in one piece, i.e., monolithically. The 50H guide is formed from a sealing material, for example an elastomer, preferably the same sealing material as that of the 24H seal.

[0150] The guide 50H comprises an anchoring mat 51H, walls 52H, referred to as "added conveying walls," and walls 52A, referred to as "added injection walls," which form a single monolithic piece, i.e., the mat 51H and the walls 52H and 52A are formed from a single piece of material. Each wall 52A and 52H is connected to the mat 51H by being directly attached to it. At least three walls 52H and at least three walls 52A are provided for the same mat 51H, preferably at least eight walls 52H and at least eight walls 52A for the same mat 51H. In combination with the receiving location 40H, the walls 52A form the reported injection field 37H and the walls 52H form the reported delivery field 39H, on the plate face 11H, as explained below.

[0151] As shown in Figures 3, 4 and 7, the mat 51H is housed in the anchoring cavity 42H, preferably so as to completely fill the anchoring cavity. Thanks to the mat 51H, the guide 50H is securely anchored to the receiving location 40H of the plate 10, at least along the plane PI 1H.

[0152] The anchoring mat 51H preferably has a shape complementary to that of the cavity 42H. In particular, as shown in [Fig. 7], the anchoring mat 51H has a bottom wall 56H that conforms to the shape of the bottom 45H of the cavity 42H. Preferably, the bottom wall 56H is parallel to the plane PI1H. The plane PI1C is preferably interposed between the bottom wall 56H of the mat 51H and the plane P11H.

[0153] In particular, the anchoring mat 51H has edge walls that respectively conform to the edges 43H and 44H of the cavity 42H. The edge walls of the mat 51H extend transversely with respect to the walls 52H and 52A. In particular, these edge walls extend in the Z direction from the bottom wall 56H, at least as far as the surface plane PI 1H. The edge walls of the anchoring mat 51H delimit the mat 51H from each other, in the X direction. Preferably, the edge wall adjacent to the edge 43H is straight and parallel to the axis R37H. Preferably, the edge wall adjoining edge 44H is stepped, comprising, along the entire 70H routing field, a part coaxial with, or parallel and close to, the R37H axis, and comprising, along the entire 39H routing field, a part parallel to the R37H axis and further away from the R37H axis.

[0154] The anchoring mat 51H preferably comprises a surface wall 53H, which is preferably flat and advantageously coplanar with the plane PI 1H, as shown in [Fig. 7], i.e., is coplanar with the receiving surfaces 41H and 46H. The surface wall 53H is opposite the bottom wall 56H of the mat 51H along the Z direction and is connected to the bottom wall 56H by the edge walls of the mat 51H. Consequently, the anchoring mat 51H advantageously fills the cavity 42H such that the mat 51H extends the receiving surfaces 41H and 46H to the location of the cavity 42H. In this case, the mat 51H is advantageously entirely contained within the anchoring cavity 42H so as not to protrude beyond the surface plane PI 1H. This advantageously avoids disturbing the flow of the functional fluid and does not reduce its cross-sectional area.The walls 52A and 52H, for their part attached to the mat 51H, project from the mat 51H, in particular from the surface wall 53H, along the Z direction. .

[0155] Alternatively, it could be provided that all or part of the mat 51H extends beyond the plane PI 1H along the Z direction, i.e. protrudes from the cavity 42H.

[0156] Preferably, the mat 51H is thicker, along the Z direction, than the sheet or plate constituting the plate 10, the thickness of the mat being measured parallel to the Z direction, from the bottom wall 56H to the surface wall 53H.

[0157] Preferably, the anchoring mat 51H comprises a conveying anchoring strip 55H and an injection anchoring strip 54H, housed in the anchoring cavity 42H when the guide 50H is received at the receiving location 40H.

[0158] The injection anchor strip 54H runs along the edge 43H along its entire length. The anchor strip 54H is advantageously parallel to the axis R37H. The conveying anchor strip 55H runs along the edge 44H for a portion of the length of the edge 44H, starting from one end of the edge 44H on the side of the added conveying field 39H. The conveying anchor strip 55H is advantageously parallel to the axis R37H. The conveying anchor strip 55H runs alongside the injection anchor strip 54H, that is, is parallel to and adjacent to the injection anchor strip 54H, but only for a portion 54A of the injection anchor strip 54H. For this portion 54A of the injection anchor strip 54H, the conveying anchor strip 55H is arranged between the strip 54H and the edge 44H. For another portion 54B of the injection anchor strip 54H, the anchor strip 54H extends along both the edges 43H and the edge 44H, so as to connect said edges 43H and 44H. In other words, the first portion 54A of the strip 54H is parallel to the strip 55H, while the second portion 54B of the strip 54H is not parallel to the strip 55H.

[0159] Preferably, as shown in Figures 3 and 4, the guide 50H belongs to the seal 24H, in that the guide 50H is attached to a portion of the seal 24H, preferably to the main closed loop 31H, by means of two tabs 69H. The tabs 69H also belong to the seal 24H. Each tab 69H is formed from the same seal material as the rest of the seal 24H, including the guide 50H. Thus, the seal 24H, including in particular the main closed loop 31H and the guide 50H, is monolithic and formed as a single unit. It is therefore particularly advantageous to form both the guide 50H and the main closed loop 31H in a single in-situ overmolding, in the same overmold, directly onto the plate 10.Alternatively, if the 24H seal is initially a separate part from the plate 10 and is subsequently attached, the 50H guide is already attached to the main closed loop 31H, which facilitates the relative positioning of these parts when the 24H seal is affixed to the plate 10. Alternatively, a single tab 69H can be provided to connect the 50H guide to the main closed loop 31H. Alternatively, the 50H guide and the 24H seal are separate parts, and the 69H tab is not provided. This can be advantageous for making the 24H seal manufactured independently of the 50H guide.

[0160] REPORTED CONVEYING FIELD 39H OF THE POLAR SEPARATOR

[0161] As shown in Figures 3 to 5, the reported conveying field 39H comprises the walls 52H belonging to the guide 50H. Each wall 52H connects the injection field 37H to the circulation field 20H, extending along the conveyor belt 51H and then the receiving surface 41H. The walls 52H are attached to the conveyor belt 51H, so as to be connected to each other by said conveyor belt 51H. The walls 52H are arranged side-by-side and spaced apart from each other along the surface plane PI 1H, so as to delimit between them channels 57H, referred to as "reported conveying channels". Each conveying channel 57H is delimited between, and by, two of said walls 52H. Each channel 57H ensures the guidance of one of the respective conveyed portions of the primary reactive fluid from the injected field 37H to the circulation field 20H.This circulation of the routed portions guided by field 39H takes place in a bypass with respect to the routed portions guided by the integrated routing field 70H, as explained above.

[0162] In particular, the walls 52H are arranged side-by-side and spaced apart along the surface plane PI 1H, distributed transversely with respect to the axis R21H. Each wall 52H connects the injection field 37H to the circulation field 20H. As can be seen in view C of [Fig. 6], along the Z direction, each wall 52H projects from the plane PI 1H. Except for their connection to the anchor mat 51H, the walls 52H of the guide 50H are separated from each other. However, when the guide 50H is in place at location 40H, the walls 52H are connected to each other by a portion of the plate face 11H that is coplanar with the plane PI 1H, which forms the bottom of the channel 57H in question. The 57H channels are also delimited, along the Z direction, by the face 91, in particular by the peripheral zone 97, against which the 52H walls are possibly supported along the Z direction, preferably over the entire length of the 52H walls.Preferably, the 52H walls are not in contact with the exchange zone 93.

[0163] Each wall 52H comprises a main section 60H, referred to as the "main conveying section," an end 61H, referred to as the "inner conveying end," and an end 62H, referred to as the "outer conveying end." The main section 60H connects the end 61H to the end 62H, preferably without interruption, and preferably such that the wall 52H is unbranched from the end 61H to the end 62H. In other words, the main section 60H terminates at the end 61H and the end 62H, opposite each other. The end 61H is directed toward the distribution orifice 15H, so as to face the injection field 37H, preferably without an intermediary. The 62H end is directed towards the 20H traffic field, so as to face the 20H traffic field, preferably without intermediary.

[0164] The ends 61H are preferably arranged to be aligned along the internal routing axis R21H. Preferably, the ends 62H are arranged to be aligned along the Y21H axis. This allows for a homogeneous distribution of the functional fluid flow while optimizing the available space in the routing field 21H.

[0165] As shown in view C of [Fig. 6], each wall 52H comprises an application surface 63H. Along the Z direction, the application surface 63H is opposite the apex surface by which the walls 52H may be supported against the face 91. Each wall 52H is supported against the receiving surface 41H, in the opposite direction to the Z direction, via the application surface 63H, preferably over the entire application surface 63H. Consequently, the application surface 63H is coplanar to the plane PI1H, over the entire application surface 63H. The application surface 63H extends from the end 62H, over a portion of the main part 60H, to the edge wall of the mat 51H oriented towards field 20H, that is, up to edge 44H. In other words, each end 62H is designed to bear on the receiving surface 41H via the application surface 63H when the guide 50H is received at the receiving location 40H. In other words, each end 62H is arranged, in projection onto the surface plane PI 1H, beyond the anchoring mat 51H, and includes a portion of the application surface 63H, through which the end 62H and a portion of the main part 60H bear on the receiving surface 41H.

[0166] The other portion of the main part 60H and the end 61H do not have an application surface 63H and extend in projection, along the Z direction, from the mat 51H. In other words, each end 61H is arranged on the anchoring mat 51H. This means that each end 61H is arranged, in projection onto the surface plane P11H, within the anchoring mat 51H. Consequently, the ends 61H do not bear against the receiving location 40H, particularly the receiving surface 41H, when the guide 50H is received at the receiving location 40H. More precisely, preferably, each end 61H is arranged on the conveying anchoring strip 55H, with none arranged on the injection anchoring strip 54H. In any case, it is advantageously through the ends 61H that the walls 52H are connected to the carpet 51H.Therefore, the carpet 51H protrudes from the walls 52H in the opposite direction to the Z direction, extending beyond the plane PI 1H and even beyond the plane PI IC.

[0167] Each channel 57H includes an input 58H, called the "internal reported routing input", an input 59H, called the "external reported routing input" and an intermediate portion 65H, called the "intermediate reported routing portion".

[0168] Each inlet 58H is bordered by two of the ends 61H. Between the ends 61H, the inlet 58H is also delimited by the surface wall 53H of the mat 51H that connects the walls 52H delimiting the channel 57H in question. Preferably, each inlet 58H, or most of the inlets 58H, faces the injection field 37H. Each inlet 59H is bordered by two of the ends 62H. Between the ends 62H, the inlet 59H is delimited by the portion of the plate face 11H that connects the walls 52H delimiting the channel 57H in question. Preferably, each inlet 59H, or most of the inlets 59H, faces the circulation field 20H. The intermediate section 65H connects entrance 58H to entrance 59H, preferably in a non-branching manner, being bordered by the main parts 60H of the walls 52H. In other words, the intermediate section 65H ends at entrances 58H and 59H.Between the main sections 60H, the intermediate portion 65H is also delimited by the portion of the plate face 11H which connects the walls 52H delimiting the channel 57H in question. Preferably, from end 61H to end 62H, wall 52H has a constant height, measured along the Z direction.

[0169] In operation, the conveyed portion of the primary reactive fluid, guided by the channel 57H delimited by the walls 52H, is admitted into the channel 57H at the inlet 58H from the injection field 37H, flows along the intermediate portion 65H, and is discharged to the circulation field 20H via the inlet 59H. The walls 52H thus serve to guide the conveyed portions of the primary reactive fluid. In particular, the main portion 60H of the walls 52H guides the fluid from the inlet 58H to the inlet 59H. The primary reactive fluid, thus guided by the conveying field 39H, flows from the distribution orifice 15H to the circulation field 20H, circulating on the surface of the face 11H, after passing through the injection orifices 29H, via the injection rim 25H and via the injection field 37H.

[0170] Preferably, the integrated 70H conveyance field comprises three or more 72H walls, and the added 39H conveyance field comprises three or more 52H walls. Preferably, the number of integrated 72H conveyance walls in the integrated 70H conveyance field is less than 5.0 times, preferably 3.0 times, the number of added 52H conveyance walls in the added 39H conveyance field, and greater than 0.2 times, preferably 0.3 times, the number of added 52H conveyance walls in the added 39H conveyance field. In this case, six 72H walls and nine 52H walls are provided.

[0171] Regarding the other added conveying field, belonging to conveying field 22H, each added conveying channel guides one of the respective conveyed portions of the primary reactive fluid from circulation field 20H to injection field 38H. Apart from this difference in the direction of flow, preferably, the same provisions as for conveying field 39H apply symmetrically.

[0172] Preferably, the intermediate portion 65H of the channel 57H furthest from the integrated conveying field 70H has a narrower width than the intermediate portion 65H of the channel 57H closest to the integrated conveying field 70H. Preferably, a gradual increase in the width of the channels 57H is provided, from the channel 57H furthest from the field 70H to the channel 57H closest to the integrated field 70H. "Width" means a dimension measured along the plane PI 1H perpendicular to one of the walls 52H bordering the measured channel 57H. This gradual increase in the width of the channels 57H advantageously ensures the most homogeneous distribution possible of the primary reactive fluid in the circulation field 20H, with the shorter channels 57H being narrower than the longer channels 57H.

[0173] Preferably, at least one of the reported routing channels 57H is narrower than the narrowest of the integrated routing channels 77H. In other words, the width of this channel 57H is less than the narrowest of the routing channels Integrated 77H channels. Preferably, most 57H channels are narrower than 77H channels, as can be seen in particular in [Fig. 4]. Using 52H add-on walls makes it easier to achieve particularly thin walls that are closely spaced, thanks to the manufacturing process, especially overmolding, compared to integrated 72H walls, whose manufacturing process may require them to be wider and further apart, particularly through stamping. The difference in width provided for the conveying channels advantageously balances the flow rates of the conveyed portions from one end of the conveying field 21H to the other, thus ensuring good distribution of the primary reactive fluid flow in the circulation field 20H, along the Y direction.

[0174] Some of the 52H walls constitute a first group G1H of conveyance walls. Preferably, the 52H conveyance walls of the first group G1H are consecutive, meaning that no other conveyance wall is interposed between the 52H walls of the first group G1H. The remaining 52H walls and the 72H walls constitute a second group G2H of conveyance walls. Preferably, the 52H and 72H conveyance walls of the second group G2H are consecutive, meaning that no other conveyance walls are interposed between the 52H and 72H walls of the second group G2H. The 52H walls belong either to the first group G1H or to the second group G2H. The first group G1H and the second group G2H of conveying walls are arranged side by side, so as to each occupy a distinct area of ​​the face of plate 11H, the two areas thus occupied being advantageously contiguous.Preferably, the first group G1H consists of 52H walls that are shorter than the 52H and 72H walls of the second group G2H. Preferably, the first group G1H is arranged in the Y direction relative to the second group G2H. Each group G1H and G2H comprises several conveying walls, preferably more than three for each group G1H and G2H. Preferably, the number of conveying walls in the first group G1H is greater than 0.1 times the number of conveying walls in the second group G2H, and less than 1.0 times the number of conveying walls in the second group G2H. In this example, six 52H added conveyance walls are planned for the first group G1H and nine 52H added or 72H integrated conveyance walls are planned for the second group G2H, including, for example, three 52H added walls and six 72H integrated walls.

[0175] Preferably, each inlet 58H delimited by the internal ends 61H of these walls 52H of the first group G1H has a reduced cross-section compared to the cross-section of the intermediate portion 65H. The cross-section is measured in a plane parallel to the Z direction and perpendicular to one of the walls 52H delimiting the channel 57H thus measured. In other words, the inlet 58H of these Channel 57H is contracted relative to the intermediate section 65H. To this end, it is preferentially provided that, for each wall 52H in this first group G1H of walls 52H, the internal conveying end 61H is wider than the width of the main conveying section 60H. The width is measured perpendicular to the wall 52H in question, parallel to plane PI 1H. Consequently, the internal conveying entrance 58H, delimited by this enlarged internal end 61H, is narrower than the width of the intermediate conveying section 65H. Here too, the width is measured parallel to plane PI 1H, perpendicular to the wall 52H in question, delimiting this channel 57H.

[0176] This locally reduced cross-section at the ends 61H of the walls 52H of the first group G1H creates a sudden pressure drop for the conveyed portions of the primary reactive fluid flow, which is not present in the channels of the second group G2H. This ensures a good distribution of the primary reactive fluid flow in the different channels of the conveying field, and therefore, in the circulation field 20H. It is primarily the shorter channels that have a reduced cross-section. Indeed, shorter channels, without a reduced cross-section, would result in a lower pressure drop than longer channels. This local pressure drop balances the flow rates of the conveyed portions, leading to the most homogeneous possible distribution of the reactive fluid flow in the circulation field 20H, along the Y direction, and thus the most homogeneous electrochemical reaction possible.

[0177] Preferably, for all the walls 52H of the first group G1H, or at least for some of them, the internal conveying end 61H is widened relative to the main part 60H in that, on one side 66H of the wall 52H, the internal end 61H projects transversely from the main part 60H, i.e., it extends laterally, and in that, on an opposite side 67H of the wall 52H, the internal end 61H is aligned with the main part 60H, i.e., it does not extend beyond it. It is understood that the end 61H projects along plane PI 1H on the side 66H, in particular along axis R21H, and does not extend along plane PI 1H on the side 67H, in particular along axis R21H in the opposite direction. Each flank 66H and 67H extends along the Z direction. Preferably, flank 66H, where end 61H protrudes, is turned towards the integrated routing field 70H.At end 61H, flanks 66H and 67H connect surface wall 53H to top face of wall 52H. At end 62H, flanks 66H and 67H connect application face 63H to top face of wall 52H.

[0178] In other words, at end 61H, wall 52H of the first group G1H has an "L" shape when projected onto plane PI 1H. This particular geometry makes it possible to create a particularly high pressure loss without making the manufacturing process of the 52H walls more complex, which can notably be obtained by overmolding.

[0179] For the walls 52H of the first group G1H, the outer end 62H is advantageously of the same width as the main part 60H. Consequently, the cross-section of the inlet 59H and the intermediate portion 65H are advantageously of the same width and cross-section, with respect to the channels 57H delimited by the walls 52H of the first group G1H. Here too, it is provided that the cross-section and the width are measured perpendicular to the wall 52H bordering the measured channel 57H, parallel to the Z direction.

[0180] It is therefore advantageous to avoid creating a local pressure loss at the end 62H, so as not to create turbulence for the primary reactive fluid flow at the end of the circulation field 20H and thus allow the most homogeneous electrochemical reaction possible along the X direction.

[0181] It is advantageously provided that the walls 52H of the first group G1H are not straight, but delimit channels that are more tortuous than the channels delimited by the walls of the second group G2H. For example, the walls 52H are bent to delimit bent channels 57H.

[0182] For the 52H walls of the second group G2H, the considerations are the same as those described for the 72H walls, also belonging to the second group G2H.

[0183] For the second group G2H, the end 61H, the main part 60H and the end 62H are advantageously of equal width, the width being measured parallel to the plane PI 1H transversely with respect to the wall 52H. It follows that each internal conveying entrance 58H delimited by the internal ends 61H of these conveying walls 52H of the second group G2H has a cross-section equal to the cross-section of the intermediate conveying portion 65H.

[0184] Preferably, for all the walls 52H of the second group G2H, the ends 61H and 62H and the main part 60H are of equal width in that, for each of the two opposite sides 66H and 67H of the wall 52H considered, the ends 61H and 62H are aligned with the main part 60H, i.e. do not protrude transversely from it.

[0185] It is also preferentially provided that the walls 52H of the second group G2H are straight from end 61H to end 62H and parallel to each other, so that the channels 57H are each straight and of constant width. This makes it possible to limit the fluidic disturbances that would be induced by a possible change in the width of the channels 57H.

[0186] Among the integrated conveying walls 72H, there is a special integrated conveying wall 72H, called the "last integrated conveying wall", which borders the integrated conveying field 70H on the side of the added conveying field 39H, i.e. in the Y direction. Similarly, among the added conveying walls 52H, there is a special added conveying wall 52H, called the "last added conveying wall", which borders the added conveying field 39H on the side of the integrated conveying field 70H, i.e. in the opposite direction to the Y direction. Preferably, these two special conveying walls 52H and 72H both belong to the first group G1H.The last integrated conveying wall 72H and the last added conveying wall 52H define a channel 77M, called the "mixed channel," which guides one of the conveyed portions of the primary reactive fluid from the injection rim 25H to the circulation field 20H. Like channels 77H and 57H, the mixed channel comprises an internal conveying inlet, an external conveying inlet, and an intermediate section. The width of the mixed channel 77M is equal to that of the adjacent channels 77H and 57H, or between the widths of the adjacent channels 77H and 57H, preferably from the internal conveying inlet of the mixed channel 77M to the other.The description given above of channels 77H and 57H delimited by walls 72H and 52H of the first group G1H applies to channel 77M, except that channel 77M is delimited by both the last integrated routing wall 72H and the last added routing wall 52H, rather than by two walls 72H or two walls 52H.

[0187] INJECTION FIELD REPORTED 37H FROM THE POLAR SEPARATOR

[0188] As shown in Figures 3, 4, and 7, the added injection field 37H comprises the walls 52A belonging to the guide 50H, i.e., additional added walls forming another added field on the plate face 11H, relative to the added walls 52H. Each wall 52A connects the injection rim 25H either to the integrated conveying field 70H or to the added conveying field 39H. To achieve this, the walls 52A extend along the receiving surface 46H and then along the conveyor belt 51H. The walls 52A are attached to the conveyor belt 51H so that they are connected to each other by said belt 51H. The walls 52A are arranged side-by-side and spaced apart along the surface plane PI 1H, so as to delimit between them channels 57A, called "added injection channels". Each added injection channel 57A is delimited between, and by, two of said walls 52A.Each channel 57A guides one of the respective injected portions of the primary reactive fluid from the rim 25H to the delivery field 21H.

[0189] In particular, the walls 52A are arranged side-by-side and spaced apart from each other along the surface plane PI 1H, being distributed transversely with respect to to axis R37H. Each wall 52A connects the rim 25H to the integrated conveying field 70H or to the added conveying field 39H. As can be seen in views A and B of [Fig. 7], along the Z direction, each wall 52A projects from plane PI 1H. Except for their connection to the anchor mat 51H, the walls 52A of the guide 50H are separated from each other. However, when the guide 50H is in place at location 40H, the walls 52A are connected to each other by a portion of the plate face 11H, namely the receiving surface 46H, which is coplanar with plane PI 1H and forms the bottom of the relevant channel 57A. The channels 57A are also delimited, along the Z direction, by the face 91, in particular by the peripheral zone 97, against which the walls 52A are supported along the Z direction, preferably over the entire length of the walls 52A. Preferably, the walls 52A are not in contact with the exchange zone 93.

[0190] Each wall 52A comprises a main portion 60A, referred to as the "main injected portion", an end 61A, referred to as the "inner injected end", and an end 62H, referred to as the "outer injected end". The main portion 60A connects the end 61A to the end 62A, preferably without interruption, and preferably such that the wall 52A is unbranched from the end 61A to the end 62A. In other words, the main portion 60A terminates at the end 61A and the end 62A, opposite each other. The end 61A is directed towards the circulation field 20H, so as to face the delivery field 21H, preferably without any intermediary or obstacle. The 62H end is directed towards the injection rim 25H, so as to face the orifices 29H, preferably without intermediary.More specifically, some of the 61A ends face the 61H ends of the added delivery field 39H, and other 61A ends face the 81H ends of the integrated delivery field 70H. The 61A ends are close to the 61H and 81H ends, and preferably face them without obstruction. The walls 52A thus guide the injected portions of primary reactive fluid from the injection field 37H to the delivery field 21H, in particular to the integrated delivery field 70H and to the added delivery field 39H.

[0191] The ends 61A are preferably arranged to be aligned along the internal injection axis R37H. Preferably, the ends 62A are arranged to be aligned along an axis parallel to the axis R37H.

[0192] Each wall 52A comprises an application surface 63A, not visible in the figures, but whose location is shown in views A and B of [Fig. 7]. Along the Z direction, the application surface 63A is opposite the apex surface by which the walls 52A may bear against the face 91. Each wall 52A bears against the receiving surface 46H, in the opposite direction to the Z direction. via the application surface 63A, preferably over its entire surface. Therefore, the application surface 63A is coplanar with plane P11H over its entire area. The application surface 63A extends from end 62A, over a portion of the main section 60A, to the edge wall of the mat 51H facing the rim 25H, that is, to the edge 43H. In other words, each end 62A is designed to bear on the receiving surface 46H via the application surface 63A when the guide 50H is received at the receiving location 40H. In other words, each end 62A is arranged, in projection in the surface plane P11H, beyond the anchoring mat 51H, and includes a part of the application surface 63A, through which the end 62A and a portion of the main part 60A are supported on the receiving surface 46H.

[0193] The other portion of the main part 60A and the end 61A do not have an application surface 63A and extend in the Z direction from the mat 51H. In other words, each end 61A is arranged on the anchoring mat 51H. This means that each end 61H is arranged, in projection onto the surface plane P11H, within the anchoring mat 51H. Consequently, the ends 61A do not bear against the receiving location 40H, particularly the receiving surface 46H, when the guide 50H is received at the receiving location 40H. More precisely, preferably, each end 61A is arranged on the injection anchoring strip 54H, with none arranged on the conveying anchoring strip 55H. In any case, it is advantageously via the ends 61A that the walls 52A are connected to the carpet 51H.Therefore, the carpet 51H protrudes from the walls 52A in the opposite direction to the Z direction, extending beyond the plane PI 1H and even beyond the plane PI IC.

[0194] Preferably, some internal injection ends 61A are arranged on the first portion 54A of the injection anchor strip 54H. These ends 61A then face the internal routing ends 61H, arranged on the routing anchor strip 55H, which runs alongside the first portion 54A. These ends 61A do not face any of the integrated internal routing ends 81H. The other internal injection ends 61A are arranged on the second portion 54B of the injection anchor strip 54H, which is not alongside the routing anchor strip 55H. Therefore, these other internal injection ends 61A do not face any of the attached internal routing ends 61H belonging to the guide 50H. These other ends 61A do, however, face the internal ends 81H.

[0195] Each channel 57A includes an input 58A, referred to as the "internal reported injection input", an input 59A, referred to as the "external reported injection input" and an intermediate portion 65A, referred to as the "intermediate reported injection portion".

[0196] Each inlet 58A is bordered by two of the ends 61A. Between the ends 61A, the inlet 58A is also delimited by the surface wall 53H of the mat 51H that connects the walls 52A delimiting the channel 57A in question. Preferably, each inlet 58A, or most of the inlets 58A, faces the conveying field 21H, either the integrated conveying field 70H or the added conveying field 39H. Each inlet 59A is bordered by two of the ends 62A. Between the ends 62A, the inlet 59A is delimited by the portion of the plate face 11H that connects the walls 52A delimiting the channel 57A in question. Preferably, each inlet 59A, or most of the inlets 59A, faces the injection rim 25H, in particular the injection orifices 29H. The intermediate portion 65A connects the inlet 58A to the inlet 59A, preferably in a non-branching manner, being bordered by the main parts 60A of the walls 52A.In other words, the intermediate section 65A terminates at inlets 58A and 59A. Between the main sections 60A, the intermediate section 65A is also delimited by the portion of the plate face 11H that connects the walls 52A delimiting the channel 57A in question. Preferably, from end 61A to end 62A, wall 52A has a constant height, measured along the Z direction.

[0197] In operation, the injected portion of the primary reactive fluid, guided by the channel 57A delimited by the walls 52A, is admitted into the channel 57A at the inlet 58A from the injection rim 25H, flows along the intermediate portion 65A, and is discharged to the conveying field 21H via the inlet 59A. The walls 52A thus serve to guide the injected portions of the primary reactive fluid. In particular, the main portion 60A of the walls 52A guides the fluid from the inlet 58A to the inlet 59A. The primary reactive fluid, thus guided by the injection field 37H, flows from the distribution orifice 15H to the conveying field 21H, flowing on the surface of the face 11H, after passing through the injection orifices 29H, via the injection rim 25H.

[0198] Preferably, the reported injection field 37H comprises four or more walls 52A. In the present case, fourteen walls 52A are provided.

[0199] Regarding the other injection field 38H, each injection channel guides one of the respective injected portions of the primary reactive fluid from the delivery field 22H to the injection rim 26H. Apart from this difference in the direction of flow, preferably, the same provisions as for the injection field 37H apply symmetrically.

[0200] Preferably, the 52A walls are of the same length. The length is measured along the PI 1H plane, perpendicular to the R37H axis.

[0201] The two walls 52A at opposite ends of the added injection field 37H are referred to as "lateral added injection walls". Advantageously, the guide 50H is connected to the loop 31H of the joint via the tabs 69H.

[0202] Preferably, the intermediate portions 65A of the channels 57A are of the same width throughout the injection field 37H, preferably except for the lateral walls 52A, which are wider. "Width" means a dimension measured along the plane PI 1H perpendicular to one of the walls 52A bordering the measured channel 57A.

[0203] A first group G1A of injection walls 52A and a second group G2A of injection walls 52A are provided. These groups G1A and G2A do not include the lateral walls 52A. All the walls 52A belong either to the first group G1A, the second group G2A, or the lateral walls. Preferably, the walls 52A of the first group G1A are consecutive, i.e., no other injection wall is interposed between the walls 52A of the first group G1A. The other walls 52A constitute a second group G2A of injection walls. Preferably, the walls 52A of the second group G2A are consecutive, i.e., no other injection wall 52A is interposed between the walls 52A of the second group G2H. The first group G1A and the second group G2A of injection walls are arranged side by side, so as to each occupy a distinct area of ​​the face of plate 11H, the two areas thus occupied being advantageously contiguous.Preferably, the first group G1A consists of 52A walls that are the same length as the 52A walls of the second group G2A, but face 52H walls that are shorter than other 52H or 72H walls, which in turn face the 52A walls of the second group G2A. Preferably, the first group G1A is arranged in the Y direction relative to the second group G2A. Each group G1A and G2A comprises several 52A walls, preferably more than two for each group G1A and G2A.

[0204] Preferably, all the internal injection ends 61A of the first group G1A are arranged on the first portion 54A of the injection anchor strip 54H. These ends 61A of the first group G1A then face the internal routing ends 61H, in particular those of the first group G1H, arranged on the routing anchor strip 55H. The internal injection ends 61A of the second group G2A are distributed, for the most part, on the second portion 54B to face the ends 81H of the second group G2H. However, some ends 61 of the second group G2A may be on the first portion 54A to face ends 61H of the second group G2H or even of the first group G1H.

[0205] Preferably, the number of injection walls in the first group G1A is greater than 0.01 times the number of injection walls in the second group G2A, and less than 1.0 times the number of injection walls in the second group G2A. In the present example, three 52A walls are provided for the first group G1A and nine 52A walls for the second group G2A.

[0206] Preferably, each inlet 58A delimited by the internal ends 61A of these walls 52A of the first group G1A has a reduced cross-section compared to the cross-section of the intermediate portion 65A. The cross-section is measured in a plane parallel to the Z direction and perpendicular to one of the walls 52A delimiting the channel 57A thus measured. In other words, the inlet 58A of these channels 57A is contracted compared to the intermediate portion 65A. To this end, it is preferably provided that, for each wall 52A of this first group G1A of walls 52A, the internal end 61A has a width increased compared to the width of the main portion 60A. The width is measured perpendicular to the wall 52A in question, parallel to the plane P11H. As a result, the internal inlet 58A delimited by this enlarged internal end 61A is of reduced width compared to the width of the intermediate injection portion 65A.Here too, the width is measured parallel to plane PI 1H, perpendicular to the wall 52A under consideration, delimiting this channel 57A.

[0207] This locally reduced cross-section at the ends 61A of the walls 52A of the first group G1A creates a sudden pressure drop for the conveyed portions of the primary reactive fluid flow, which is not present in the channels of the second group G2A, in order to ensure a good distribution of the primary reactive fluid flow in the different channels of the injection field, and therefore, in the circulation field 20H. This local pressure drop balances the flow rates of the injected portions, leading to the most homogeneous possible distribution of the reactive fluid flow in the circulation field 20H, along the Y direction, and thus the most homogeneous electrochemical reaction possible.

[0208] Preferably, for all the walls 52A of the first group G1A, or at least for some of them, the inner end 61A is enlarged relative to the main part 60A in that, on one side 66A of the wall 52A, the inner end 61A projects transversely from the main part 60A, i.e., it extends laterally, and in that, on an opposite side 67A of the wall 52A, the inner end 61A is aligned with the main part 60A, i.e., it does not extend beyond it. It is understood that the end 61A projects along plane PI 1H on the side 66A, in particular along axis R37H, and does not extend along plane PI 1H on the side 67A, in particular along axis R37H in the opposite direction. Each flank 66A and 67A extends along the Z direction. At the end 61 A, flanks 66A and 67A connect the surface wall 53H to the top face of the wall 52A.At end 62A, sides 66A and 67A connect application face 63A to top face of wall 52A.

[0209] In other words, at end 61A, wall 52A of the first group G1A has an "L" shape when projected onto plane PI 1H. This particular geometry makes it possible to create a particularly high pressure loss without making the manufacturing process of the 52A walls more complex, which can notably be obtained by overmolding.

[0210] Preferably, for the side walls 52A, for the side 66A or 67A turned towards the other walls 52A of groups G1A and G2A, the ends 61A and 62A and the main part 60A are aligned, as seen in [Fig.4] and in view A of [Fig.7],

[0211] Preferably, the internal conveying end 61H of at least a portion of the conveying walls 52H of the first group G1H faces the internal injection end 61A of at least a portion of the injection walls 52A of the first group G1A. Preferably, the internal conveying end 61H of at least a portion of the conveying walls 52H of the second group G2H faces the internal injection end 61A of at least a portion of the injection walls 52A of the second group G2A. In other words, the first group G1A faces the first group G1H and the second group G2A faces the second group G1H, at least in part. Preferably, the side 66A, where the end 61A is transversely projecting, is turned in the opposite direction to the sides 66H, where the end 61H is transversely projecting.This increases the pressure drop during the circulation of the primary reactive fluid flow between the injection field 37H and the delivery field 39H at the first opposing groups G1A and G1H, by creating a tortuous path from one field to the other. More generally, and preferably, for the walls 52A of the two groups G1A and G2A, the flank 66A is directed in the opposite direction to the flanks 66H.

[0212] It is further advantageously provided that, for the inlets 58A delimited by the ends 61A of the injection walls of the first group G1A, the surface wall 53H of the anchoring mat 51H is locally raised so as to extend beyond the plane PI 1H along the Z direction, in order to help reduce the cross-section of the inlet 58A. This is visible in view A of [Fig. 7]. Preferably, for the other inlets 58A, or even everywhere else, the surface wall 53H is coplanar with the plane P11H.

[0213] For the walls 52A of the first group G1A, the outer end 62A is advantageously of the same width as the main part 60A. Consequently, the cross-section of the inlet 59A and the intermediate portion 65A are advantageously of the same width and cross-section, with respect to the channels 57A delimited by the walls 52A of the first group G1A. Here too, it is provided that the cross-section and the width are measured perpendicular to the wall 52A bordering the measured channel 57A, parallel to the Z direction.

[0214] It is therefore advantageous to avoid creating a local pressure drop at the 62A end, so as not to create turbulence for the primary reactive fluid flow on the side of the injection rim 25H and do not cause too much pressure loss for the circulation from the distribution port 15H.

[0215] It is advantageously provided that the walls 52A of the first group G1A are straight and thus delimit straight channels 57A, except for the entrance 58A with reduced cross-section.

[0216] For the second group G2A, the end 61A, the main part 60A and the end 62A are advantageously of equal width, the width being measured parallel to the plane PI 1H transversely with respect to the wall 52A. It follows that each internal entrance 58A delimited by the internal ends 61A of these injection walls 52A of the second group G2A has a cross-section equal to the cross-section of the intermediate injection portion 65A.

[0217] Preferably, for all the walls 52A of the second group G2A, the ends 61A and 62A and the main part 60A are of equal width in that, for each of the two opposite sides 66A and 67A of the wall 52A considered, the ends 61A and 62A are aligned with the main part 60A, i.e. do not protrude transversely from it.

[0218] It is also preferentially provided that the walls 52A of the second group G2A are straight from end 61A to end 62A and parallel to each other, so that the channels 57A are each straight and of constant width. This makes it possible to limit the fluidic disturbances that would be induced by a possible change in the width of the channels 57A.

[0219] Preferably, for at least one of the internal routing inlets 58H whose cross-section is reduced compared to the intermediate routing portion 65H, the cross-section of the internal routing inlet 58H is between 0.30 and 0.80 times the cross-section of the intermediate routing portion 65H.

[0220] Preferably, for at least one of the internal injection inlets 58A whose cross-section is reduced compared to the intermediate injection portion 65A, the cross-section of the internal injection inlet 58A is between 0.05 and 0.15 times the cross-section of the intermediate injection portion 65A.

[0221] Preferably, for at least one of the internal injection inlets 58A whose cross-section is reduced compared to the intermediate injection portion 65A, the cross-section of this internal injection inlet 58A is between 0.5 and 1.4 times the cross-section of at least one of the internal routing inlets 58H whose cross-section is reduced compared to the intermediate routing portion 65H.

[0222] These dimensional ratios make it possible to obtain a particularly optimized pressure loss.

[0223] MISCELLANEOUS

[0224] Forming part of the delivery field 21H and the injection field in the form of the attached fields 37H and 39H, as described previously, minimizes the impact on face 1 IC opposite face 11H when the functional elements of the plate 10 are obtained by stamping, since the cavity 42H, which causes the presence of the back 27C, occupies a particularly small area on face 1 IC. The receiving surfaces 41H and 46H, on the other hand, cause the presence of flat surfaces on face 1 IC, which can advantageously also serve as receiving surfaces for another attached guide on the side of face 1 IC.

[0225] The description of the injection field 37H and the routing field 21H above applies preferentially also to that of the routing field 22H and the injection field 38H and is therefore not detailed. Fields 22H and 38H are preferentially identical to fields 21H and 37H, due to the central symmetry of the separator 5 with respect to an axis parallel to the Z direction. During use, the walls and channels of fields 22H and 38H operate in the opposite direction to those of the conveying field 21H and 37H, since the primary reactive fluid, as well as the reaction products formed in the circulation field 20H, flow from the circulation field 20H to the distribution orifice 16H, being guided successively via the conveying field 22H and the injection field 38H, via the rim 26H, through the injection orifices, to the orifice 16H.

[0226] As shown very schematically in [Fig.2], the face 1110 of the separator 105 has a structure and function similar to that of face 11H of separator 5, except that face 1110 guides the secondary reactive fluid and not the primary reactive fluid. Face 1110 and face 92 are supported against each other along the Z direction, being superimposed. On face 1110, the polar separator 105 comprises a circulation field 1200, which is superimposed on the exchange zone 93, two conveying fields 1210 and 1220, superimposed on the peripheral zone 97, a seal 1240, and two injection rims 1250 and 1260, respectively delimiting the orifices 1150 and 1160. The orifice 1150 supplies face 1110 with the secondary reactive fluid via the rim 1250. The secondary reactive fluid from the rim 1250 is guided to the circulation field 1200 via the conveying field 1210, where it participates in the electrochemical reaction by coming into contact with the exchange zone 93.The secondary reactive fluid and reaction products are then guided from the circulation field 1200 to the rim 1260 via the conveying field 1220. The secondary fluid and reaction products are finally discharged through the orifice 1160, from the rim 1260. The seal 1240 is interposed between the face 1110 and the face 92 along the Z direction, forming a main closed loop surrounding at least the circulation field 1200 and the . Conveying fields 1210 and 1220 prevent secondary reactive fluid from escaping at the periphery. Seal 1240 also includes secondary closed loops to prevent fluid from escaping from distribution ports not already surrounded by the primary closed loop.

[0227] The above description concerned fields 37H, 39H and 70H to guide the circulation of the primary reactive fluid along the polar separator 5. However, it could also apply to the circulation of secondary reactive fluid or to the circulation of cooling fluid.

[0228] Any feature described above for one embodiment or variant is applicable to the other embodiments and variants described above, insofar as technically possible.

Claims

1. Demands Polar separator (5), for an electrochemical cell (4), the polar separator (5) comprising: • a polar plate (10), comprising a distribution orifice (15H) and a plate face (11H), from which the distribution orifice (15H) passes through the polar plate (10) from one side to the other, the plate face (11H) being parallel to a surface plane (PI 1H), the plate face (11H) comprising an injection rim (25H), delimiting the distribution orifice (15H), and a circulation field (20H); • Conveying walls (52H, 72H), forming a conveying field (39H, 70H) on the surface of the plate face (11H) between the injection rim (25H) and the circulation field (20H), the conveying walls (52H, 72H) being arranged side-by-side along the surface plane (P11H), so as to delimit conveying channels (57H, 77H) arranged side-by-side along the surface plane (P11H), each conveying channel (57H, 77H) being delimited between, and by, two of said conveying walls (52H, 72H) and guiding a conveyed portion of a functional fluid, from the injection rim (25H) to the circulation field (20H), or from the field circulation (20H) to the injection edge (25H), each conveying wall (52H, 72H) comprising: • an internal routing endpoint (61H, 81H), each routing channel (57H, 77H) comprising an internal routing inlet (58H, 78H) bordered by two of the internal routing ends (61H, 81H), and • a main routing section (60H, 80H), which terminates with the internal routing end (61H, 81H), each routing channel (57H, 77H) comprising an intermediate routing section (65H, 85H) bordered by two of the main routing sections (60H, 80H); • injection walls (52A), forming an injection field (37H) on the surface of the plate face (11H) between the injection rim (25H) and the conveying field (39H, 70H), the injection walls (52A) being arranged side-by-side along the surface plane (PI 1H), so as to delimit injection channels (57A) arranged side-by-side along the surface plane (P11H), each injection channel (57A) being delimited between, and by, two of said injection walls (52A) and guiding an injected portion of the functional fluid from the injection rim (25H) to the circulating field (20H) or vice versa, each injection wall (52A) comprising: • an internal injection end (61A), facing the internal delivery ends (61H, 81H), each injection channel (57A) comprising an internal injection inlet (58A) bordered by two of the internal injection ends (61A), and • a main injection portion (60A), which terminates with the internal injection end (61A), each injection channel (57A) comprising an intermediate injection portion (65A) bordered by two of the main injection portions (60A); in which: • the conveyance walls (52H, 72H) form: • a first group (G1H), for which each internal conveying entrance (58H, 78H) delimited by the internal conveying ends (61H, 81H) of these conveying walls (52H, 72H) has a reduced cross-section compared to the cross-section of the intermediate conveying portion (65H, 85H), and • a second group (G2H), for which each internal routing entrance (58H, 78H) delimited by the internal routing ends (61H, 81H) of these routing walls (52H, 72H) has a cross-section cross-section equal to the cross-section of the intermediate conveying portion (65H, 85H); • the injection walls (52A) form: • a first group (G1A), for which each internal injection inlet (58A) delimited by the internal injection ends (61 A) of these injection walls (52A) has a reduced cross-section compared to the cross-section of the intermediate injection portion (65A), and • a second group (G2A), for which each internal injection inlet (58A) delimited by the internal injection ends (61 A) of these injection walls (52A) has a cross-section equal to the cross-section of the intermediate injection portion (65A).

2. Polar separator (5) according to claim 1, wherein: • for the first group (G1H) of the conveying walls (52H, 72H), the inner conveying end (61H, 81H) is of increased width compared to the width of the main conveying part (60H, 80H), so that the inner conveying entrance (58H, 78H) delimited by this inner conveying end (61H, 81H) is of reduced width compared to the width of the intermediate conveying portion (65H, 85H); and • for the second group (G2H) of the conveying walls (52H, 72H), the inner conveying end (61H, 81H) and the main conveying part (60H, 80H) are of the same width.

3. Polar separator (5) according to any one of the preceding claims, wherein: • for the first group (G1A) of the injection walls (52A), the internal injection end (61A) has a wider width compared to the width of the main injection part (60A), such that the internal injection inlet (58A) delimited by this internal injection end (61 A) is of reduced width compared to the width of the intermediate injection portion (65A); and • for the second group (G2A) of injection walls (52A), the internal injection end (61A) and the main injection part (60A) are of the same width.

4. Polar separator (5) according to any one of the preceding claims, wherein: • for at least some conveying walls (52H, 72H) of the first group (G1H), the inner conveying end (61H, 81H): • projects transversely from the main conveying part (60H, 80H), for a first flank (66H) of the conveying wall (52H, 72H), and • is aligned with the main conveying part (60H, 80H), for a second flank (67H) of the conveying wall (52H, 72H); and / or • for at least some injection walls (52A) of the first group (G1A), the internal injection end (61A): • protrudes transversely from the main injection part (60A), for a first flank (66A) of the injection wall (52A), and • is aligned with the main injection part (60A), for a second flank (67A) of the injection wall (52A).

5. Polar separator according to claim 4, wherein the respective first flank (66H) of the conveying walls (52H, 72H) is directed opposite to the first flank (66A) of the injection walls (52A).

6. Polar separator (5) according to any one of the preceding claims, wherein: • the conveying walls (52H, 72H) of the first group (G1H) are successive; • the conveying walls (52H, 72H) of the second group (G2H) are successive; • the first group (G1H) and the second group (G2H) of conveying walls (52H, 72H) are arranged side by side; • the injection walls (52A) of the first group (G1A) are successive; • the injection walls (52A) of the second group (G2A) are successive; and • the first group (G1A) and the second group (G2A) of injection walls (52A) are arranged side by side.

7. Polar separator (5) according to any one of the preceding claims, wherein: • the inner conveying end (61H, 81H) of at least a portion of the conveying walls (52H, 72H) of the first group (G1H) faces the inner injection end (61A) of at least a portion of the injection walls (52A) of the first group (G1A); and • the inner conveying end (61H, 81H) of at least a portion of the conveying walls (52H, 72H) of the second group (G2H) faces the inner injection end (61A) of at least a portion of the injection walls (52A) of the second group (G2A).

8. Polar separator (5) according to any one of the preceding claims, wherein: • the number of conveying walls (52H, 72H) of the first group (G1H) is: • greater than 0.1 times the number of conveying walls (52H, 72H) of the second group (G2H), • less than 1.0 times the number of conveying walls (52H, 72H) of the second group (G2H); • the number of injection walls (52A) of the first group (G1A) is: • greater than 0.05 times the number of injection walls (52A) of the second group (G2A), • less than 1.0 times the number of injection walls (52A) of the second group (G2A).

9. Polar separator according to any one of the preceding claims, wherein: • for at least one of the internal routing inlets (58H, 78H) whose cross-section is reduced compared to the cross-section of the intermediate routing portion (65H, 85H), the cross-section of the internal routing inlet (58H, 78H) is between 0.30 and 0.80 times the cross-section of the intermediate routing portion (65H, 85H); and • for at least one of the internal injection inlets (58A, 78H) whose cross-section is reduced compared to the cross-section of the intermediate injection portion (65A), the cross-section of the internal injection inlet (58A) is between 0.05 and 0.15 times the cross-section of the intermediate injection portion (65A).

10. Polar separator (5) according to any one of the preceding claims, wherein, for at least one of the internal injection inlets (58A) whose cross-section is reduced compared to the cross-section of the intermediate injection portion (65A), the cross-section of this internal injection inlet (58A) is between 0.5 and 1.4 times the cross-section of at least one of the internal routing inlets (58H) whose cross-section is reduced compared to the cross-section of the intermediate routing portion (65H, 85H).

11. A polar separator according to any one of the preceding claims, wherein: • each conveying wall (52H, 72H) comprises an external conveying end (62H, 82H), the main conveying section (60H, 80H) terminating at the external conveying end (62H, 82H) opposite the internal conveying end (61H, 81H); • for the conveying walls (52H, 72H) of the first group (G1H) and the second group (G2H), the external conveying end (62H, 82H) and the main conveying section (60H, 80H) are of the same width; • each injection wall (52A) comprises an external injection end (62A), the main injection section

12.

13. (60A) ending with the external injection end (62A) opposite the internal injection end (61A); • for the injection walls (52A) of the first group (G1A) and the second group (G2A), the external injection end (62A) and the main injection part (60A) are of the same width. Polar separator (5) according to any one of the preceding claims, wherein: • the plate face (11H) includes a receiving location (40H), connecting the injection rim (25H) to the circulation field (20H); • the polar separator (5) includes a guide (50H) which is received on the receiving location (40H), the guide (50H) being formed by a single monolithic piece of joint material comprising the conveying walls (52H) of the first group (G1H), the injection walls (52A) of the first group (G1A), at least some of the conveying walls (52H) of the second group (G2H) and at least some of the injection walls (52A) of the second group (G2A). Polar separator (5) according to claim 12, wherein: • the guide (50H) includes an anchoring mat (51H), to which each conveying wall (52H, 72H) and each injection wall (52A) formed by the guide (50H) is connected, so that these conveying walls (52H, 72H), these injection walls (52A) and the anchoring mat (51H) together form the single monolithic piece of joint material, the anchoring mat (51H) extending beyond the surface plane (PI 1H) from the conveying walls (52H, 72H) and the injection walls (52A), so that said anchoring mat (51H) is housed in an anchoring cavity (42H) belonging to the receiving location (40H), formed in a hollow by the plate face (11H), thus anchoring the guide (50H) at the reception location (40H); and • each internal injection end (61A) of the injection walls (52A) of the first group (G1A) and each the internal conveying end (61 H, 81 H) of the conveying walls (52H, 72H) of the first group (G1H) is arranged on the anchoring mat (51H).

14. Polar separator (5) according to any one of the preceding claims, wherein at least some of the conveying walls (72H) of the second group (G2H) are formed by the plate face (11H) and therefore belong to the polar plate (10).

15. Polar separator (5) according to any one of the preceding claims, wherein: • the injection rim (25H) comprises a row of injection orifices (29H), such that the functional fluid flowing on the surface of the plate face (11H) via the injection rim (25H) passes through the polar plate (10) via the injection orifices (29H) to reach the distribution orifice (15H), or such that the functional fluid flowing in the distribution orifice (15H) passes through the polar plate (10) via the injection orifices (29H) of the injection rim (25H) to reach the plate face (11H), at the injection rim (25H);and • the injection field (37H) is arranged along the row of injection ports (29H), between the row of injection ports and the conveying field (39H, 70H), so that the injection field (37H) guides the conveyed portions of the functional fluid from the injection ports (29H) to the circulating field (20H) or vice versa.;

16. Fuel cell (1), comprising electrochemical cells (4), at least one of the electrochemical cells (4) comprising: • the polar separator (5) according to any one of claims 1 to 15, constituting a first polar separator (5); • a second polar separator (105); and • a membrane-electrode assembly (90), comprising an exchange zone (93) which includes a proton exchange membrane, electrochemical cell (4) in which the first polar separator (5), the membrane-electrode assembly (90) and the second polar separator (105) are superimposed along a stacking direction (Z), such that the membrane-electrode assembly (90) is interposed between the first polar separator (5) and the second polar separator (105), the circulation field (20H) of the polar plate (10) of the first polar separator (5) being in contact with the exchange zone (93) along the stacking direction (Z).

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