Fuel cell stack for providing electric current

Abstract

The present invention relates to a fuel cell for providing electric current from the chemical reaction energy of a first fluid and a second fluid, comprising a channel sealing frame (10), a bridge sealing frame (20), an electrolyte frame (50) and a lead-out plate (40) for leading the electric current, wherein the bridge sealing frame (20) has an inflow bridge element (22) for guiding the second fluid from an inflow inlet (70) for the second fluid to a second flow volume area (21) across an inflow inlet (60) for the first fluid, and the bridge sealing frame (20) also has an outflow bridge element (23) for guiding the second fluid from the second flow volume area (21) across an outflow outlet (61) for the first fluid to an outflow outlet (71) for the second fluid. The present invention also relates to a fuel cell stack, which comprises at least one fuel cell according to the present invention and at least one other fuel cell.

Description

Technical Field

[0001] The invention relates to a fuel cell stack for providing electric current. Background Art

[0002] A fuel cell is a galvanic cell that converts the chemical reaction energy of a continuously supplied fuel and an oxidant into electrical energy.

[0003] Fuel cells usually have electrodes separated from one another by an ion-conducting electrolyte. The fuel and oxidant, which must be continuously supplied and discharged during the operation of the fuel cell, flow around the electrolyte separately from one another.

[0004] In order to achieve the highest possible efficiency of a fuel cell, the fuel and the oxidant must enter the electrolyte in a predetermined ratio. It is also advantageous if the reaction is carried out at a certain temperature. Summary of the invention

[0005] The present invention provides a fuel cell and a fuel cell stack.

[0006] Further features and details of the invention are apparent from the expanded technical solution, the description and the drawings. It is obvious that the features and details described in conjunction with the fuel cell according to the invention also apply to the fuel cell stack according to the invention, and vice versa, so that reference can always be made to each other with regard to the disclosure of the individual inventive aspects.

[0007] According to a first aspect, the present invention proposes a fuel cell for providing electric current from the chemical reaction energy of a first fluid and a second fluid, the fuel cell comprising: a channel sealing frame with a first flow volume area, the first flow volume area can be flowed through by a first fluid; a bridge sealing frame with a second flow volume area, the first flow volume area can be flowed through by a second fluid; an electrolyte frame with an electrolyte volume area, an electrolyte is arranged in the electrolyte volume area, wherein the electrolyte frame is arranged between the channel sealing frame and the bridge sealing frame; and at least two lead-out plates for leading out electric current, wherein a channel sealing frame, a bridge sealing frame and an electrolyte frame are arranged between the at least two lead-out plates, wherein the channel The sealing frame, the bridge sealing frame, the electrolyte frame and the outlet plate respectively have an inlet and an outlet for the first fluid and an inlet and an outlet for the second fluid, wherein the inlet for the second fluid is arranged upstream of the inlet for the first fluid, and the outlet for the second fluid is arranged downstream of the outlet for the first fluid, and the bridge sealing frame has at least one inlet bridge element to guide the second fluid from the inlet for the second fluid across the inlet for the first fluid to the second flow volume area, and also has at least one outflow bridge element to guide the second fluid from the second flow volume area across the outlet for the first fluid to the outlet for the second fluid.

[0008] Here, a fuel cell is understood to be any device capable of directly generating electric current from two different fluids by means of a chemical reaction. A channel sealing frame and / or a bridge sealing frame and / or an electrolyte frame can be a fence surrounding at least one predetermined volume. It can be provided that the channel sealing frame and / or the bridge sealing frame and / or the electrolyte frame are at least partially or completely constructed as fluid-tight, especially on the part surrounding the flow volume area. The flow volume area or the electrolyte volume area does not have to be a materially closed area, but can be provided that at least one side of the area is not surrounded by the corresponding frame. The corresponding volume is then limited by a cavity, which is closed by an imaginary widening on the surface of the frame. The volume limited in this way can be particularly square. The first fluid and / or the second fluid can be a fuel and / or an oxidant, wherein hydrogen, methanol, CH4 or coal gas can be particularly provided for the fuel, and oxygen or air can be particularly provided for the oxidant. For example, potassium hydroxide solution, polymer membrane, phosphoric acid, alkali metal carbonate melt can also be provided as an oxide ceramic electrolyte as an electrolyte. If inflow and outflow are mentioned in the present application, the description relates to the flow direction, wherein the inflow is always located upstream of the outflow. However, it is conceivable in principle that the flow direction can also be reversed. The export plate can be constructed and arranged so that the export plate and the electrolyte of the electrolyte frame together limit the flow volume area of ​​the bridge seal frame and / or the channel seal frame in space. Regarding the spatial position of the inflow for the second fluid and the inflow for the first fluid, the upstream can be understood in this sense: the inflow for the first or second fluid is viewed in the flow direction through which the flow volume area is flowed parallel to the direction and is located upstream. This does not mean that the first and second fluids have the same source or sink or flow through the same flow volume area.

[0009] It may be provided that the first and second fluids flow through the first flow volume and the second flow volume in a common direction or in opposite directions.

[0010] The fuel cell according to the invention makes it possible for the first and second fluids to flow very uniformly through the respective flow volume regions and for the electrolyte to be optimally supplied with both fluids. In particular, it is achieved that no regions with little or no flow are present in the flow volume regions. The reactivity of the fuel cell would be reduced at such locations, which would result in a lower current.

[0011] This advantage is achieved in the following way: each frame (i.e., the channel sealing frame, the bridge sealing frame, and the electrolyte frame) and the outlet plate respectively have an inlet and an outlet for the first fluid and for the second fluid. This makes it possible for the first and / or second fluid to flow from the frame or the outlet plate to the frame or the outlet plate respectively arranged above or below it. In order to ensure that the flow flows particularly evenly through the flow volume area, the inlet and the outlet are not arranged side by side in the flow direction through the flow volume area, but are arranged front and back. However, in order for the second fluid to reach and leave the flow volume area of ​​the bridge sealing frame, an inflow bridge element must be provided for this purpose, which spans the inflow or outflow port through which the first fluid can flow. The channel sealing frame can be constructed in such a way that the channel sealing frame seals the inlet and outlet for the second fluid relative to the flow volume area.

[0012] In the fuel cell according to the invention, it can in particular be provided that the channel sealing frame has at least one inlet tunnel element at an inlet for the first fluid, through which the first fluid can flow from the inlet for the first fluid into the first flow volume area, and / or the channel sealing frame has at least one outflow tunnel element at an outflow for the first fluid, through which the first fluid can flow out from the first flow volume area to the outflow for the first fluid.

[0013] The following paragraphs describe variants for the inflow tunnel element. These variants can also be provided for the outflow tunnel element.

[0014] Here, the inflow tunnel element can be configured as a tube, thereby producing a particularly uniform laminar flow. Alternatively, it can be provided that the inflow tunnel element has a cross section with a square, rectangular or other geometric shape, wherein these shapes can be particularly matched to the cross section of the flow volume area in order to achieve a uniform flow. It can be provided that a single inflow tunnel element is provided, through which the flow volume area can flow. This can be advantageous in fluid technology, especially when the fuel cell is particularly small, in which case, even in the case of a single large inflow tunnel element, a laminar flow can be ensured. Alternatively, a plurality of inflow tunnel elements can also be provided, thereby even in the case of a larger size and in other cases, eddies can also be made in the flow volume area. It can also be provided that a vortex element is arranged in the inflow tunnel element, which vortex element makes the flow vortex and prevents laminar flow, thereby in the flow volume area, there is a higher flow velocity near the edge that acts as a limit. The corresponding vortex element can also be arranged in the flow volume area.

[0015] Advantageously, in the fuel cell according to the invention, it can be provided that the inlet for the first fluid and / or the outlet for the second fluid of the bridge seal frame, the electrolyte frame and the outlet plate are arranged aligned with one another. In other words, by this arrangement, a common inlet is obtained across the different frames or outlet plates in the stack, which inlet has no steps at the transition between the individual frames or outlet plates. This makes it possible to achieve a particularly uniform flow through the inlet or outlet.

[0016] Furthermore, in the fuel cell according to the invention, it is conceivable that the at least one inflow bridge element and / or the at least one outflow bridge element and / or the bridge-type sealing frame are integral. In other words, the at least one inflow bridge element and / or the at least one outflow bridge element and / or the bridge-type sealing frame can be constructed as a one-piece component. This offers the advantage that undesired changes in the flow can be reliably prevented by avoiding connection points.

[0017] Advantageously, in the fuel cell according to the invention, it can be provided that the electrolyte has a catalyst. This can further improve the reactivity of the fuel cell. In particular, it can be provided that the catalyst is distributed over the entire surface of the electrolyte, so that a particularly uniform flow in the fuel cell according to the invention leads to a particularly efficient generation of current.

[0018] In the fuel cell according to the invention, it can be advantageously provided as a further measure that the channel sealing frame or the bridge sealing frame or the electrolyte frame is made of plastic and / or ceramic. The use of plastic has the advantage of increasing the chemical resistance, especially with regard to reactions occurring in the fuel cell. Plastics thus offer the advantage of having a particularly low weight compared to metals even with high strength requirements. The use of ceramics likewise offers the advantage of particularly good chemical resistance, especially in reactions occurring in the fuel cell, wherein ceramics have particularly good temperature stability, especially compared to plastics or metals.

[0019] It can also be provided within the scope of the invention that at least one gas diffusion layer is provided between the sealing frame and / or the bridge sealing frame and the outlet plate. The reaction gases can be better distributed and directed to the entire active electrode surface via the gas diffusion layer. In addition, the gas diffusion layer can support the transport of the generated products, such as water, out of the membrane. This improves the efficiency of the fuel cell overall.

[0020] The fuel cell according to the present invention can also have at least one thermostatic sealing frame with a third flow volume area, which can be flowed by a third fluid, wherein in particular, the at least one thermostatic sealing frame is arranged on one of the outlet plates. In other words, a third fluid can be provided for operating the fuel cell, which can be used in particular for regulating the temperature of the fuel cell. Since the fuel cell usually works optimally within a specific predetermined temperature range, it is particularly advantageous for the operation of the fuel cell if the temperature of the fuel cell can be precisely regulated to a point. It can be provided that the flow direction in the flow volume area is oriented transversely to the flow direction of the first and / or second fluid. Here, the inlet and outlet through the thermostatic sealing frame can also be constructed on the side of the thermostatic sealing frame, which is oriented transversely to the flow direction of the first or second fluid. However, it can also be provided that the inlet and outlet of the thermostatic sealing frame are arranged in front of the inlet for the second fluid and in front of the outlet for the second fluid in the flow direction of the first and second fluids in the flow volume area of ​​the channel sealing frame and the bridge sealing frame. In this case, the flow direction of the third fluid corresponds to the flow direction of the first fluid and / or the second fluid, or is opposite thereto.

[0021] Furthermore, in the fuel cell according to the invention, it is conceivable that the inflow tunnel element and / or the outflow tunnel element is designed as a hole in the channel sealing frame. In other words, the inflow tunnel element and / or the outflow tunnel element can have an opening with a circular cross section. This ensures that the flow through the inflow and outflow tunnel elements takes place particularly uniformly and can therefore be distributed optimally in the flow volume area of ​​the channel sealing frame.

[0022] It can also be provided within the scope of the invention that the number of inflow bridge elements corresponds to the number of outflow bridge elements and / or in particular the number of inflow tunnel elements corresponds to the number of outflow tunnel elements. This makes it possible to achieve a particularly uniform flow through the flow volume area compared to an arrangement in which the number of inflow bridge elements or inflow tunnel elements does not correspond to the number of outflow bridge elements or outflow tunnel elements.

[0023] According to a further aspect of the invention, a fuel cell stack is claimed, which has at least one fuel cell according to the invention, wherein the fuel cell stack has at least one further fuel cell, in particular a further fuel cell according to the invention. In this case, the same advantages as described in conjunction with the fuel cell according to the invention are obtained for the fuel cell stack. In particular, the overall flow is improved by all fuel cells of the fuel cell stack being configured according to the invention.

[0024] Other measures to improve the invention are derived from the following description. Some embodiments of the invention are schematically shown in the drawings. All features and / or advantages derived from the technical solution, the description or the drawings, including structural details and spatial arrangements, can constitute the essence of the invention not only individually but also in different combinations. It should be noted that the drawings have an illustrative character and should not be considered to limit the invention in any form. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings schematically show:

[0026] Figure 1 : Schematic arrangement of a fuel cell according to the prior art,

[0027] Figure 2 : A schematic variant of a fuel cell arrangement according to the invention,

[0028] Figure 3 : Another fuel cell arrangement according to the invention,

[0029] Figure 4 : A schematic diagram of a fuel cell bridge sealing frame according to the present invention,

[0030] Figure 5 ; Enlarged part of the bridge seal frame,

[0031] Figure 6 ; Schematic diagram of the electrolyte framework,

[0032] Figure 7 : Schematic diagram of the channel sealing framework,

[0033] Figure 8 : Enlarged schematic diagram of the channel sealing frame,

[0034] Fig. 9 : Schematic diagram of the arrangement of the channel sealing frame, electrolyte frame and bridge sealing frame,

[0035] Fig.10 : Schematic diagram of the arrangement of the channel sealing frame, the bridge sealing frame and the electrolyte frame with two export plates,

[0036] Fig.11 : Another schematic diagram of an arrangement with a thermostatic sealing frame,

[0037] Fig.12 : A top view of a schematic diagram of a fuel cell according to the present invention.

[0038] In the drawings, the same reference numerals are used for the same technical features even in different embodiments. DETAILED DESCRIPTION

[0039] Figure 1 A fuel cell 200 according to the prior art is shown. The figure shows a plurality of flow volume areas 211, 221 and 231 stacked one above the other, in which one fluid flows from an inlet 260, 270, 280 to an outlet 261, 271, 281. The figure should be understood as follows: only one fluid flows on each level and the inlet and outlet are connected to each other via all layers. It can be seen in the figure that the inlets 260, 270, 280 do not each fill the entire lateral side of the flow area, but are arranged in a stacked manner. This is the case with the outlets 261, 271, 281, in which the outlets are arranged in reverse order in order to achieve a uniform flow. However, from Figure 1 It is also clear that the arrangement according to the prior art inside the fuel cell 200 results in flows with different directions in the flow volumes 211, 221, 231, so that it may happen that: the first, second or also the third fluid cannot be optimally propagated in the flow volume, or different concentrations appear in different parts of the various layers.

[0040] By means of the fuel cell 100 according to the present invention, as in Figure 2 As shown in the example, a uniform flow is obtained. Figure 2 A fuel cell 100 is schematically shown in FIG, wherein the section shows a channel sealing frame 10. In the present example, the fuel cell 100 has a rectangular cross section having a longitudinal side and a transverse side. Obviously, the fuel cell can also have other cross sections, wherein for simplicity, a rectangular example with a short transverse side and a long longitudinal side is used as a reference. The channel sealing frame 10 has an inlet 70 for a second fluid, which is arranged in front of an inlet 60 for a first fluid in the longitudinal direction. At the other end of the longitudinal side of the channel sealing frame 10, the outlet 61 for the first fluid is correspondingly arranged in front of the outlet 71 for the second fluid in the longitudinal direction. Here, the flow volume area 11 can be flowed through by the first fluid. Here, the flow direction of the first fluid is along the longitudinal side of the channel sealing frame 10 from the inlet 60 for the first fluid to the outlet 61 for the first fluid. In addition, an inlet 80 for a third fluid and an outlet 81 for the third fluid are provided. According to Figure 1, the inlet and outlet are arranged at opposite ends of the longitudinal edge, respectively. This makes it possible to achieve that the third fluid flows through the flow volume area 31 of the temperature control sealing frame 30 along the lateral side of the channel sealing frame transversely to the flow direction of the first or second fluid. In particular, it can be provided that the third fluid is a temperature control medium, which is suitable for regulating the temperature of the fuel cell 100. In order to enable the flow of the second fluid in the flow volume area 21 of the bridge sealing frame 20 on the fuel cell 100, the bridge sealing frame 20 must have at least one inflow bridge element 22 to guide the second fluid in the inlet 70 for the second fluid to the second flow volume area 21 across the inlet 60 for the first fluid. In addition, the bridge sealing frame 20 has at least one outflow bridge element 23 to guide the second fluid from the second flow volume area 21 across the outflow outlet 61 for the first fluid to the outflow outlet 71 for the second fluid.

[0041] exist Figure 3 , another alternative of the fuel cell 100 is shown, in which the respective frame 10, 20, 30, 50 or outlet plate 40 has an inlet 80 for a third fluid on the lateral side in addition to the inlet 60 for the first fluid and the inlet 70 for the second fluid. The same applies to the corresponding outlets 61, 71, 81. In this arrangement, the temperature-controlled sealing frame 30 must also have an inlet bridge element in order to guide the third fluid from the inlet 80 for the third fluid over the inlet 70 for the second fluid and the inlet 60 for the first fluid to the third flow volume area 31, and the temperature-controlled sealing frame also has at least one outflow bridge element in order to guide the third fluid from the third flow volume area 31 over the outlet 61 for the first fluid and the outlet 71 for the second fluid to the outlet 81 for the third fluid.

[0042] Finally, in Figure 4 2 shows a sealing bridge frame 20 according to the invention, which has a second flow volume area 21 through which a second fluid can flow. It is also shown that an inlet 70 for the second fluid is arranged upstream of an inlet 60 for the first fluid, and an outlet 71 for the second fluid is arranged downstream of an outlet 61 for the first fluid. The terms upstream or downstream refer to the flow direction of the fluid in the flow volume area 21, as in Figure 4 Indicated by arrows. Figure 4It is also shown in the figure that the bridge seal frame 20 has an inlet 80 for the third fluid and an outlet 81 for the third fluid, which are separated from the flow volume area 21 in a sealed manner. Similarly, the inlet 60 for the first fluid and the outlet 61 for the first fluid are separated from the flow volume area 21 in a sealed manner. Therefore, the second flow volume area 21 can only be flowed by the second fluid, wherein the second fluid flows from the inlet 70 for the second fluid via the Figure 4 The fluid finally flows through the second flow volume region 21 through the inflow bridge element 22 , which is designed as a tube, and then reaches the outflow opening 71 for the second fluid via the outflow bridge element 23 , which is also designed as a tube.

[0043] It can be provided that the at least one inflow bridge element 22 and / or the at least one outflow bridge element 23 and / or the bridge-type sealing frame 20 are integral. Figure 4 As shown in FIG. 1 , the number of inflow bridge elements 22 corresponds to the number of outflow bridge elements 23 .

[0044] Figure 5 An enlarged view of a partial area of ​​the bridge seal frame 20 is shown, with a portion of the second flow volume area 21 and an outflow opening 61 for the first fluid and an outflow opening 71 for the second fluid. It can be clearly seen that the second fluid can flow from the second flow volume area 21 into the outflow opening 61 for the first fluid via the outflow bridge element 23 to the outflow opening 71 for the second fluid.

[0045] Finally, in Figure 6 , an electrolyte frame 50 is shown, which has an electrolyte volume region 51, in which an electrolyte 52 is arranged. In addition, Figure 6 The electrolyte frame 50 in the fuel cell 100 has an inlet 60 for a first fluid and an inlet 70 for a second fluid, and an outlet 61 for the first fluid and an outlet 71 for the second fluid, which are arranged on opposite transverse sides of the electrolyte frame 50. In addition, the electrolyte frame 50 has an inlet 80 for a third fluid and an outlet 81 for the third fluid, which are arranged at the ends of the longitudinal sides of the electrolyte frame 50. In the fuel cell 100, the electrolyte frame 50 is arranged between the channel sealing frame 10 and the bridge sealing frame 20.

[0046] Figure 7 A channel sealing frame 10 is shown with a first flow volume area 11, through which a first fluid can flow. Figure 7The channel sealing frame 10 in FIG. 1 has an inlet 70 for a second fluid and an inlet 60 for a first fluid, which are arranged on one of the two transverse sides of the channel sealing frame 10. An outflow 61 for the first fluid is arranged on the opposite transverse side of the channel sealing frame 10, and an outflow 71 for the second fluid is arranged behind the outflow 61 for the first fluid in the flow direction. It is also shown that an inflow 80 for a third fluid is also arranged on a longitudinal side of the channel sealing frame 10, and an outflow 81 for the third fluid is arranged on the opposite longitudinal side. In the channel sealing frame 10, the first fluid flows from the inflow 60 for the first fluid through the inflow tunnel element 12 into the first flow volume area 11, so as to flow on the other side through the outflow tunnel element 13 to the outflow 61 for the first fluid.

[0047] at last, Figure 8 A further enlarged view of the channel sealing frame 10 is shown, in which it can be seen how the first fluid can flow from the end region of the first flow volume region 11 through the outflow tunnel element 13 to the outflow opening 61 for the first fluid. The outflow opening 71 for the second fluid located therebehind cannot be flowed through by the first fluid in the channel sealing frame 10.

[0048] exist Fig. 9 It is shown in the figure that in the fuel cell 100 according to the present invention, the electrolyte frame 50 is arranged between the channel sealing frame 10 and the bridge sealing frame 20. Here, the electrolyte 52 arranged in the electrolyte volume area 51 of the electrolyte frame 50 closes the first volume area 11 of the channel sealing frame 10 and the second volume area 21 of the bridge sealing frame 20 on one side.

[0049] exist Fig.10 In the figure, the channel sealing frame 10, the bridge sealing frame 20 and the electrolyte frame 50 are connected to each other and stacked, wherein it can be seen that at least two outlet plates 40 are provided for outlet current, wherein the channel sealing frame 10, the bridge sealing frame 20 and the electrolyte frame 50 are arranged between the at least two outlet plates 40. Thus, the outlet plate 40 closes the first flow volume area 11 on the channel sealing frame 10 side and closes the second flow volume area 21 on the bridge sealing frame 20 side.

[0050] at last, Fig.11 A diagram is shown in which the channel sealing frame 10, the bridge sealing frame 20, the electrolyte frame 50 and the outlet plate 40 are joined together to form a stack, and a temperature control frame 30 is also shown which is arranged above one of the outlet plates 40. It can also be provided that two temperature control frames 30 are provided, wherein the outlet plate 40 is arranged between the temperature control frames 30. Fig.11In the example shown, a third fluid suitable for regulating the temperature of the fuel cell 100 can flow from the inlet 80 for the third fluid to the outlet 81 for the third fluid via the third flow volume region 31 , thereby efficiently cooling the fuel cell 100 .

[0051] It can be provided that the first flow volume region 11, the second flow volume region 21 and the third flow volume region 31 have at least two, in particular three, identical spatial dimensions, so that the first flow volume region, the second flow volume region and the third flow volume region have at least the same cross-sectional area or in particular the same volume. This provides the following advantage: the flow volume regions 11, 21, 31 can be arranged particularly well in an overlapping manner, thereby ensuring a particularly efficient chemical reaction of the fuel cell 100.

[0052] Finally, in Fig.12 A fuel cell stack 1000 is depicted in FIG. 1 , wherein the fuel cell stack 1000 has a plurality of fuel cells 100 arranged in a stack. Fig.12 In the embodiment, the inlet 60 for the first fluid of the channel sealing frame 10, the bridge sealing frame 20, the electrolyte frame 50, the outlet plate 40 and the temperature control sealing frame 30 are arranged in alignment with each other. As a result, a particularly uniform flow of the first fluid in the inlet 60 for the first fluid can be achieved. Correspondingly, the same applies to the corresponding inlet 70 for the second fluid, the outlet 61 for the first fluid, the outlet 71 for the second fluid, and the inlet 80 for the third fluid and the outlet 81 for the third fluid.

[0053] The fuel cell stack 1000 according to the present invention having the fuel cell 100 according to the present invention makes it possible to efficiently avoid the Figure 1 Instead of the different flow directions of the fluids shown in the flow volume regions 11, 21, 31, a uniform flow can be achieved in the flow regions 11, 21, 31. This allows not only a particularly efficient distribution of the first fluid and the second fluid in the electrolyte 52, but also a particularly good temperature control of the fuel cell 100, thereby further improving the chemical reaction.

[0054] The above description of the embodiment only illustrates the present invention within the scope of examples. Obviously, as long as it makes sense in technology, the individual features of the embodiment can be freely combined with each other without departing from the scope of the present invention.

Claims

1. A fuel cell (100) for providing electric current from the chemical reaction energy of a first fluid and a second fluid, the fuel cell having: A channel sealing frame (10), the channel sealing frame having a first flow volume area (11), the first flow volume area being capable of being flowed through by the first fluid; A bridge seal frame (20), the bridge seal frame having a second flow volume area (21), the second flow volume area being capable of being flowed through by the second fluid; An electrolyte frame (50) having an electrolyte volume region (51) in which an electrolyte (52) is arranged, wherein: The electrolyte frame (50) is arranged between the channel sealing frame (10) and the bridge sealing frame (20), and at least two lead-out plates (40) for leading out current, wherein the channel sealing frame (10), the bridge sealing frame (20) and the electrolyte frame (50) are arranged between the at least two lead-out plates (40), The channel sealing frame (10), the bridge sealing frame (20), the electrolyte frame (50) and the outlet plate (40) respectively have an inlet (60) and an outlet (61) for the first fluid and an inlet (70) and an outlet (71) for the second fluid, wherein the inlet (70) for the second fluid is arranged upstream of the inlet (60) for the first fluid, and the outlet (71) for the second fluid is arranged downstream of the outlet (61) for the first fluid, The bridge seal frame (20) has at least one inflow bridge element (22) for guiding the second fluid from an inflow inlet (70) for the second fluid to the second flow volume area (21) across an inflow inlet (60) for the first fluid, and the bridge seal frame (20) also has at least one outflow bridge element (23) for guiding the second fluid from the second flow volume area (21) to the outflow outlet (71) for the second fluid across an outflow outlet (61) for the first fluid.

2. The fuel cell (100) according to claim 1, characterized in that: The channel sealing frame (10) At least one inflow tunnel element (12) is provided at the inflow opening (60) for the first fluid, through which the first fluid can flow from the inflow opening (60) for the first fluid into the first flow volume region (11), and / or At the outflow opening (61) for the first fluid, at least one outflow tunnel element (13) is provided, through which the first fluid can flow out of the first flow volume region (11) to the outflow opening (61) for the first fluid.

3. The fuel cell (100) according to claim 1 or 2, characterized in that: Inlet openings (60) for the first fluid and / or outlet openings (71) for the second fluid of the sealing bridge frame (20), the electrolyte frame (50) and the discharge plate (40) are arranged aligned with one another.

4. The fuel cell (100) according to claim 3, characterized in that: The at least one inflow bridge element (22) and / or the at least one outflow bridge element (23) and / or the bridge sealing frame (20) are integral.

5. The fuel cell (100) according to claim 1 or 2, characterized in that: The electrolyte (52) has a catalyst.

6. The fuel cell (100) according to claim 1 or 2, characterized in that: The channel sealing frame (10) and / or the bridge sealing frame (20) and / or the electrolyte frame (50) are made of plastic and / or ceramic.

7. The fuel cell (100) according to claim 1 or 2, characterized in that: At least one gas diffusion layer is arranged between the channel sealing frame (10) and / or the bridge sealing frame (20) and the outlet plate (40).

8. The fuel cell (100) according to claim 1 or 2, characterized in that: At least one temperature-controlled sealing frame (30) is provided which has a third flow volume region (31), through which a third fluid can flow.

9. The fuel cell (100) according to claim 8, characterized in that: The at least one temperature-controlled sealing frame (30) is arranged on one of the discharge plates (40).

10. The fuel cell (100) according to claim 2, characterized in that: The inflow tunnel element (12) and / or the outflow tunnel element (13) are designed as holes in the channel sealing frame (10).

11. The fuel cell (100) according to claim 1 or 2, characterized in that: The number of the inflow bridge elements (22) corresponds to the number of the outflow bridge elements (23).

12. The fuel cell (100) according to claim 2, characterized in that: The number of the inflow tunnel elements (12) corresponds to the number of the outflow tunnel elements (13).

13. A fuel cell stack (1000), comprising at least one fuel cell (100) according to any one of claims 1 to 12, wherein: The fuel cell stack (1000) has at least one further fuel cell.

14. The fuel cell stack (1000) according to claim 13, characterized in that: The at least one further fuel cell is a further fuel cell (100) according to any one of claims 1 to 12.

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