Plate-type component for a fuel cell stack, method for positioning same and fuel cell stack
Patent Information
- Application Number
- EP2023797718
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-10-24
- Filing Date
- 2023-10-23
- Publication Date
- 2025-09-03
Smart Images
Figure 1.1
Abstract
Description
[0001] PLATE-SHAPED COMPONENT FOR A FUEL CELL STACK, METHOD FOR POSITIONING THE SAME, AND FUEL CELL STACK
[0002] The present invention relates to a plate-shaped component for a fuel cell stack, which has at least one position marking for aligning the plate-shaped components when stacking the fuel cell stack. The invention also relates to a method for positioning and / or determining a position and / or orientation of at least one plate-shaped component, in particular for stacking a plurality of plate-shaped components to form a fuel cell stack according to the invention, as well as to a fuel cell stack having a plurality of plate-shaped components according to the invention.
[0003] In the manufacture of fuel cell stacks, plate-shaped components are typically stacked. These plate-shaped components comprise at least two end plates, in particular cathode and anode end plates, which form the two ends of the stack, and separator plates and membrane electrode assemblies arranged between them. The membrane electrode assemblies are often already bonded to the separator plates, for example, to a frame surrounding the membrane electrode assemblies. Stacking the plate-shaped components therefore primarily involves stacking these separator plates.These must be positioned precisely relative to one another to ensure that openings in the separator plates, which later form channels for reactants, products and cooling medium running in the stacking direction, are positioned cleanly relative to one another, that the flow fields are reliably aligned, and that seals in the area of the designated surfaces ensure reliable sealing of the plate-shaped components with one another in the fuel cell stack. In practice, the plate-shaped components are often stacked against corresponding stops. This is relatively easy with metallic separator plates. This is more difficult with separator plates made from a graphite-filled plastic matrix. Such separator plates are typically formed in molds or dies and are fully or at least partially cured therein.In order to reliably demold the manufactured elements, they must have so-called demolding slopes on their end faces. This means that when stacked against a stop, only one of the flat sides rests against the stop in the area of its end face. The material there is then correspondingly thin and may be brittle due to the low material thickness, or minimal burrs have formed in this area, which is typically the parting line of the mold or die. This leads to damage to the edges during stacking. Although this is not critical for the function of the separator plate in itself, it does make it extremely difficult to align the individual separator plates with one another using such lateral stops. In addition, broken-off material particles can get between the plates. This makes it almost impossible to stack the plate-shaped components tightly.
[0004] It is an object of the present invention to provide a plate-shaped component for a fuel cell stack with which the stacking of the plate-shaped components can be improved, an improved method for positioning and / or determining a position and / or orientation of at least one plate-shaped component, and an improved fuel cell stack.
[0005] This object is achieved by the features of the independent patent claims. Advantageous embodiments and further developments of the invention emerge from the dependent claims.A first aspect of the present invention relates to a plate-shaped component, in some embodiments a separator plate or a cathode end plate or an anode end plate or an intermediate plate or a half-shell of a separator, cathode end plate or anode end plate, or a frame for holding a membrane electrode assembly, for a fuel cell stack according to one embodiment, wherein a surface of the plate-shaped component has at least three adjacent regions which form at least parts of a position marking, and respective adjacent ones of the at least three adjacent regions are formed such that when the surface is viewed along a predetermined direction, the respective adjacent regions have different average reflectivities at least in the visible range, in one embodiment at least in the visible wavelength range, in one embodiment at a wavelength of 500 nm.
[0006] In one embodiment, the position marking or an image thereof can be detected by an optical sensor such as a camera, and based on the detected position marking or image thereof, a position and / or orientation of the plate-shaped component in space can be determined, which can be used to align the plate-shaped components when stacking the plate-shaped components to form the fuel cell stack. In this way, a stop-free alignment can be achieved during stacking, which facilitates the stacking of the plate-shaped components, largely prevents damage to the edges of the plate-shaped components, and reduces the risk of broken-off material particles getting between the plate-shaped components.
[0007] Furthermore, since respective adjacent regions of the at least three adjoining regions are designed in such a way that, when the surface is viewed along a predetermined direction, the respective adjacent regions have different average reflectivities at least in the visible range, an image of the position marking captured by the optical sensor can have a high contrast, whereby the accuracy in determining the (spatial) position and orientation of the plate-shaped component can be improved.
[0008] In some embodiments, when capturing the image of the position marking by means of the optical sensor, in particular the section of the plate-shaped component in which the position marking is formed can be irradiated with a light of a predetermined light wavelength or with light within a predetermined light wavelength range, whereby the accuracy in determining the (spatial) position and orientation of the plate-shaped component can be improved.
[0009] At least two of the position markings can be integrated into the surface of the plate-shaped component in such a way that they are spaced apart from one another. In particular, it is sufficient to provide the position marking(s) on one of the two main surfaces of the plate-shaped component in order to be able to control the positioning of the individual plate-shaped component during stacking via the optical sensor. To achieve precise positioning of the plate-shaped component, relatively large position markings are necessary. A much better solution is to use two position markings arranged at a distance from one another.For this construction, for example, small position markings can be used which are arranged on two opposite sides of the plate-shaped component, in particular in the area of the two sides which are further apart from one another, between the side edges of the corresponding plate-shaped component and a functional surface such as an opening, a flow field or the like. Due to the relatively large distance, simple and precise alignment of the plate-shaped component is easily possible, for example using a camera which records the position marking(s) and controls an automated depositing device. The preferred arrangement of the position marking outside the functional surface ensures that this can be implemented independently of the function of the separator plate or the other plate-shaped components. It can, for example, be arranged between the outer edge and corresponding openings orPorts must be arranged for the supply and removal of reactants, products and cooling medium.
[0010] In some embodiments, the surfaces of the respective adjacent regions of the at least three adjacent regions have different average roughnesses.
[0011] Here, "average roughness" refers to a macroscopic average roughness. The average roughness depth Rz of one of the two areas that reflects incident light less strongly can be 6.3 pm, while the average roughness depth Rz of the other of the two areas can be 2.5 pm.
[0012] In this way, it can be achieved in a simple manner, for example by treating / not treating individual surfaces of the respective adjacent ones of the at least three adjoining regions in such a way that they have different average roughnesses or roughness depths, that a high-contrast image of the position marking can be captured by means of the optical sensor.
[0013] In one embodiment, the surfaces can be substantially planar surfaces, and in another embodiment, they can be coplanar surfaces. In one embodiment, the coplanar surfaces can be parallel to the main surfaces of the plate-shaped component.
[0014] In some embodiments, respective tangents to respective sections of the surfaces of the respective adjacent ones of the at least three adjoining regions have respective different inclinations relative to a normal to a mean plate plane, which corresponds to an averaged height profile of the plate-shaped component. The sections of the surfaces of the respective adjacent regions have, in particular, different inclinations relative to the main surface of the plate-shaped component. As a result, in some embodiments, the individual regions of the position marking can be better distinguished from one another based on the image captured by the optical sensor, thereby improving the determination of the position of the plate-shaped component.
[0015] At least one of the at least three adjacent regions can be formed by a recess or at least as part of a recess in the plate-shaped component, in one embodiment in the main surface thereof. The depth of the recess can be in the range from 0.15 mm to 0.25 mm, and in one embodiment, 0.22 mm. Such a recess as part of the position marking enables a simple and efficient construction in which nothing protrudes beyond the main surface of the plate-shaped component, which could potentially have a negative impact on the seal between the individual plate-shaped components when stacked to form the fuel cell stack.
[0016] In the event that at least one of the at least three adjoining regions is formed by a depression or at least as part of a depression in the plate-shaped component, a transition from this region to an adjacent region of the at least three adjoining regions is preferably designed such that a radius of the transition region (seen in the cross section of the plate-shaped component, in particular in the cross section of the plate-shaped component perpendicular to the main surface) is in the range from 0.1 mm to 0.2 mm, in one embodiment is 0.15 mm.
[0017] The recess made in the main surface is formed in one embodiment such that its depth, which can be in the range from 0.2 mm to 0.25 mm, in one embodiment 0.22 mm, is smaller than the thickness of the plate-shaped component. The recess therefore does not form a breakthrough through the plate-shaped component, which could also be associated with a deterioration in the tightness of the structure. Rather, the corresponding section of the position marking is merely made in the material of the plate-shaped component and can in particular be part of a mold or die in which the corresponding plate-shaped component is manufactured. In this case, the position marking can preferably be formed primarily untreated off-the-tool, although care must be taken to ensure that the edges of the recess are free of burrs and that any burrs that may occur are removed.
[0018] In the case of metallic plate-shaped components such as metallic separator plates or end plates, which are preferably installed with separator plates based on carbon material, the region of the position marking formed at least as part of a recess can also be formed in another way, for example as a laser engraving, as an embossing, as a structural element or the like.
[0019] As already mentioned, the plate-shaped components can be separator plates or parts of separator plates, preferably separator plates already connected to an MEA (membrane electrode assembly) or parts, in particular half-shells, of separator plates. Furthermore, the plate-shaped components comprise the corresponding end plates of the fuel cell stack. Further intermediate plates for sealing individual areas and / or for redirecting or distributing media are also conceivable. These plate-shaped components are then stacked on top of one another and aligned accordingly using the position marking(s) in order to achieve reliable stacking that is simple, efficient, and well-suited for large-scale production. This is independent of the geometric design of the outer edges, in particular their tolerances and any burrs that may arise during production.
[0020] In particular, the separator plates or parts of separator plates can consist of a carbon-containing material and a matrix material, for example, a resin mixed with carbon or the like. This material can be formed and / or cured in a mold or die. The mold contains the entire geometry for the separator plates, such as the functional surfaces on the one hand and the position marking(s) on the other hand, which is thus represented by an inverse image in the mold and can thus be placed with exceptional precision in relation to the other functional parts of the plate-shaped components. This creates a high level of precision, which, when the position marking is used to align the individual plate-shaped components during stacking, leads to high-quality fuel cell stacks simply and efficiently.
[0021] In some embodiments, respective tangents to the respective portions of the surfaces of two of the at least three adjacent regions separated by another region of the at least three adjacent regions may have respective different inclinations relative to the normal to the mean plate plane.
[0022] In one embodiment, this allows the determination of the position of the plate-shaped component to be further improved.
[0023] In some embodiments, two of the at least three adjacent regions separated by at least one other of the at least three adjacent regions have coplanar surfaces.
[0024] This ensures that, assuming the same roughness, the average reflectivity of the two areas with the coplanar surfaces is the same.
[0025] In some embodiments, at least one of the three adjacent regions is an annular region.
[0026] An annular region configured in this way can enable precise detection and relatively precise alignment of the structure, since a control system for aligning position markings one above the other can be implemented relatively easily, efficiently, and with high accuracy using at least one annular region. In some embodiments, at least one of the three adjacent regions has a convex section or a concave section, as viewed in a cross-section of the plate-shaped component, in particular in a cross-section of the plate-shaped component perpendicular to the main surface.
[0027] In one embodiment, this allows a light ring to be formed in the focal point of the convex or concave section, whereby the contrast of the image of the position marking captured by the optical sensor can be further improved.
[0028] In some designs, at least three adjacent areas are concentric areas.
[0029] In one embodiment, this allows the determination of the position of the plate-shaped component to be further improved, since the center of the position marking can be determined more easily using the concentric areas.
[0030] In an embodiment in which the at least three adjacent regions are five adjacent circular or annular concentric regions, a diameter of an innermost (circular) of the five regions may be in the range of 2 mm to 2.5 mm, in one embodiment 2.25 mm, while a diameter of a fourth of the five regions viewed radially outward from a center of the position marking may be in the range of 4.5 mm to 5.5 mm, in one embodiment 5 mm.
[0031] Furthermore, in this embodiment, a respective angle of inclination of the respective tangent to a respective section of the innermost region, the third region, and the fifth region can be in the range from 0° to 5°, in one embodiment 0°, the angle of inclination of the tangent to the section of the second region can be in the range from 10° to 60°, in one embodiment 20°, and the angle of inclination of the tangent to the section of the fourth region can be in the range from 70° to 85°. Furthermore, in this embodiment, a width or a length of the third region of the at least three adjacent regions can be in the range from 0.4 mm to 0.45 mm, in one embodiment 0.429 mm.
[0032] A second aspect of the present invention relates to a method for positioning and / or determining a position and / or orientation of at least one plate-shaped component described above, in particular for stacking a plurality of plate-shaped components to form a fuel cell stack, wherein the position marking on the plate-shaped component is detected by means of an optical sensor and the position and / or orientation of the plate-shaped component is determined based on the detected position marking.
[0033] In some embodiments, the plate-shaped component can be positioned based on the determined position and / or orientation of the plate-shaped component.
[0034] Furthermore, in some embodiments, several of the plate-shaped components can be stacked to form a fuel cell stack, wherein the alignment of the plate-shaped components can be carried out by means of an automated storage device based on the determined positions and / or orientations of the plate-shaped components.
[0035] The position marking is the same marking in the same position on all plate-shaped components, so that it can be easily used as a basis for aligning the plate-shaped components to each other.
[0036] A third aspect of the present invention relates to a fuel cell stack comprising a plurality of plate-shaped components described above stacked one above the other. A fourth aspect of the present invention relates to a computer-implemented method for aligning at least two plate-shaped components described above with one another, comprising the following steps:
[0037] Receiving data comprising image data of at least one position marking of a first of the at least two plate-shaped components, captured by an optical sensor,
[0038] Evaluating the captured image data of the at least one position marking of the first plate-shaped component in order to determine a position and / or orientation of the first plate-shaped component,
[0039] Receiving data comprising image data captured by the optical sensor of at least one position marking of a second of the at least two plate-shaped components,
[0040] Evaluating the captured image data of the at least one position marking of the second plate-shaped component in order to determine a position and / or orientation of the second plate-shaped component,
[0041] Comparing the determined positions and / or orientations of the first and second plate-shaped components, and
[0042] Outputting a signal to an automated depositing device to cause the automated depositing device to change the position and / or orientation of the second plate-shaped component such that the first and second plate-shaped components are stacked on top of each other such that their positions and / or orientations are aligned with each other.
[0043] The features and advantages described with respect to the first aspect of the invention and its advantageous embodiment also apply, at least where technically reasonable, to the second aspect, the third aspect, and the fourth aspect of the invention and their advantageous embodiment, and vice versa. Further features, advantages, and possible applications of the invention will become apparent from the following description in conjunction with the figures, in which the same reference numerals are used throughout for the same or corresponding elements of the invention. They show, at least partially schematically:
[0044] Fig. 1 : a schematic view of a system for carrying out the method for stacking plate-shaped components to form a fuel cell stack,
[0045] Fig. 2 is a plan view of a plate-shaped component for a fuel cell stack according to an embodiment,
[0046] Fig. 3 is a cross-sectional view through a plate-shaped component illustrated in Fig. 2 according to an embodiment along a section line AA shown in Fig. 2,
[0047] Fig. 4 is a cross-sectional view through a plate-shaped component illustrated in Fig. 2 according to another embodiment along the section line AA shown in Fig. 2, and
[0048] Fig. 5 is a schematic view of an image captured by an optical sensor of the position marker illustrated in Fig. 4.
[0049] Fig. 1 shows a schematic view of a system for carrying out a method for stacking plate-shaped components to form a fuel cell stack according to one embodiment.
[0050] The fuel cell stack 100 has an end plate 20 at its lower end, in particular a cathode end plate or anode end plate, onto which separator plates 10, in a design with an inserted membrane electrode assembly, are stacked, optionally after the arrangement of an intermediate plate (not shown here). In another embodiment, the membrane electrode assembly can also be applied to an already positioned separator plate 10 during the process, and then the next separator plate 10 can be arranged or stacked on top of it.
[0051] The system for the automated implementation of the method is designed as an automated depositing device 30, for example in the form of a robot, which has a gripper arm 31 and is connected to an optical sensor 40, which may, for example, have a camera, via a communication link. In the state illustrated in Fig. 1, a separator plate 10' has already been picked up by the gripper arm 31 from a storage device (not shown) for plate-shaped components 10, 20, wherein the separator plate 10' is to be stacked onto the already stacked part of the fuel cell stack 100 in such a way that the plate-shaped components 10, 20 are aligned with or on one another.
[0052] For precise positioning of the plate-shaped components 10, 20, they have one or more, in one embodiment two, position markings 11 illustrated in Fig. 2. The system is configured to capture an image of these position markings 11 by means of the optical sensor 40, to determine the (spatial) position and orientation of the plate-shaped components 10, 20 in space based on the captured image, and to control a movement of the gripper arm 31 such that the plate-shaped component 10, 20 is positioned precisely on the already stacked part of the fuel cell stack 100.
[0053] In the embodiment shown in Fig. 2, the plate-shaped component is designed as a separating plate 10. In other embodiments not shown in Fig. 2, the plate-shaped component can also be designed as a cathode end plate 20, anode end plate 20, an intermediate plate, a half-shell of a separator, cathode end plate, or anode end plate, or a frame for holding a membrane electrode assembly.
[0054] The position markings 11 are arranged within an outer edge 13 of the plate-shaped component 10, 20 such that their position relative to the functional elements of the plate-shaped component 10, 20, which have, for example, openings 12 for the supply and removal of reactants, products and cooling medium as well as a flow field 14 located in the center, is independent of possible tolerances and / or mechanical impairments of these edges 13.
[0055] Fig. 3 shows a cross-sectional view through the plate-shaped component illustrated in Fig. 2 according to an embodiment along a section line AA shown in Fig. 2, in particular along a position marking formed on the plate-shaped component.
[0056] The position marking 11, or a part thereof, has a recess formed in a main surface 15 of the plate-shaped component 10, 20. The surface of the plate-shaped component 10, 20 has three adjacent circular or ring-shaped concentric regions b1, ..., b3, which are or form parts of the position marking 11. Adjacent regions of the three adjacent regions b1, ..., b3 are configured such that, when the surface is viewed along a predetermined direction, in particular relative to the main surface 15, the adjacent regions b1, ..., b3 have different average reflectivities, at least in the visible range.
[0057] This is achieved in the embodiment illustrated in Fig. 3 in particular in that respective tangents t1, t2, t3 to respective sections of the surfaces of respective adjacent regions b1 and b2 or b2 and b3 have respective different inclinations relative to a normal to a mean plate plane of the plate-shaped component 10, 20, which corresponds to an averaged height profile of the plate-shaped component 10, 20 and, in one embodiment, runs parallel to the main surface 15 of the plate-shaped component 10, 20.
[0058] Here, the regions b1 and b3, which are separated by the region b2, have coplanar surfaces, wherein an inclination angle of the tangents t1 and t3 is 0° relative to the normal to the central plate plane, and the inclination angle of the tangent t2 relative to the normal to the central plate plane is approximately 45°. Furthermore, the region b2 has a convex region as seen in the cross-sectional direction. Fig. 4 shows a cross-sectional view through the plate-shaped component illustrated in Fig. 2 according to another embodiment along the section line AA shown in Fig. 2, in particular along the position marking formed on the plate-shaped component.
[0059] The position marking 11 or a part thereof has a plurality of recesses which are introduced into the main surface 15 of the plate-shaped component 10, 20 and have a smaller depth d, which can be in the range of 0.2 mm to 0.25 mm, in one embodiment is 0.22 mm, than a thickness D of the plate-shaped component 10, 20.
[0060] Here, the surface of the plate-shaped component 10, 20 has five adjacent circular or ring-shaped concentric regions b11, ..., b15, which are or form parts of the position marking 11. A diameter d1 of the circular innermost region b11 can be in the range from 2 mm to 2.5 mm, in one embodiment 2.25 mm, an outer diameter d2 of the ring-shaped region b14 can be in the range from 4.5 mm to 5.5 mm, in one embodiment 5 mm, and a width of the third ring-shaped region b13, viewed radially outward from the center of the position marking 11, can be in the range from 0.4 mm to 0.45 mm, in one embodiment 0.429 mm. Furthermore, the transitions between adjacent regions b11, ..., b15 are designed such that a respective transition region (seen in the cross section of the plate-shaped component 10, 20, in particular in the cross section of the plate-shaped component 10, 20 perpendicular to the main surface 15) has a radius in the range of 0.1 mm to 0.2 mm, in one embodiment is 0.15 mm.
[0061] Respective adjacent regions b11, ..., b15 of the five adjoining regions are designed such that, when the surface is viewed along a predetermined direction, the respective adjacent regions b11, ..., b15 have different average reflectivities, at least in the visible range. This is achieved in the embodiment illustrated in Fig. 4, in particular, in that respective tangents t11, t15 to respective sections of the surfaces of respective adjacent regions b11, b15 have respective different inclinations relative to a normal to a central plate plane, which corresponds to an averaged height profile of the plate-shaped component 10, 20 and runs parallel to the main surface 15.
[0062] Here, the regions b11, b13, and b15, which are separated by the regions b12 and b14, respectively, have coplanar surfaces, wherein an inclination angle of the tangents t11, t13, and t15 is 0°, the inclination angle of the tangent t12 is in the range of 10° to 60°, in a preferred embodiment is 20°, and the inclination angle of the tangent t14 is in the range of 70° to 85°. Furthermore, the regions b12 and b14 have a convex region viewed in the cross-sectional direction, and the regions b13 have a concave region viewed in the cross-sectional direction.
[0063] Fig. 5 shows a schematic view of an image captured by an optical sensor of the position marker illustrated in Fig. 4.
[0064] The image 60 of the position marking 11, which was captured by means of an optical sensor 40 aligned along the predetermined direction, in particular perpendicular to the main surface 15, has regions 61, ..., 65 formed corresponding to the regions b11, ..., b15 of the surface of the plate-shaped component 10, 20, wherein respective adjacent regions 61, ..., 65 have different brightnesses, so that the different regions b11, ..., b15 of the surface of the plate-shaped component 10, 20 can be clearly distinguished.
[0065] In a method for positioning and / or determining a position and / or orientation of at least one plate-shaped component 10, 20 according to one embodiment, in particular for stacking a plurality of plate-shaped components 10, 20 to form a fuel cell stack 100, the position marking 11 of the plate-shaped component 10, 20 is detected by means of the optical sensor 40 and the position and / or orientation of the plate-shaped component 10, 20 is determined based on the detected position marking 11.
[0066] Here, the plate-shaped component 10, 20 can be positioned based on the determined position and / or orientation of the plate-shaped component 10, 20.
[0067] Furthermore, several of the plate-shaped components 10, 20 can be stacked to form a fuel cell stack 100, wherein the alignment of the plate-shaped components 10, 20 can be carried out by means of the automated storage device 30 based on the determined positions and / or orientations of the plate-shaped components 10, 20.
[0068] In a computer-implemented method for aligning at least two plate-shaped components 10, 20:
[0069] Receive data comprising image data of at least one position marking 11 of a first of the at least two plate-shaped components 10, 20 acquired by means of the optical sensor 40, evaluate the acquired image data of the at least one position marking 11 of the first plate-shaped component 10, 20 in order to determine a position and / or orientation of the first plate-shaped component 10, 20,
[0070] Receive data comprising image data of at least one position marking 11 of a second of the at least two plate-shaped components 10, 20, captured by means of the optical sensor 40, evaluate the captured image data of the at least one position marking 11 of the second plate-shaped component 10, 20 to determine a position and / or orientation of the second plate-shaped component 10, 20, compare the determined positions and / or orientations of the first and second plate-shaped components 10, 20, and output a signal to the automated depositing device 30 to cause the automated depositing device 30 to change the position and / or orientation of the second plate-shaped component 10, 20 such that the first and second plate-shaped components 10, 20 are stacked on top of one another such that their positions and / or orientations are aligned with one another.
[0071] List of reference symbols
[0072] 10 separator plate
[0073] 11 Position marking
[0074] 12 Breakthrough
[0075] 13 outer edge
[0076] 14 Flow field
[0077] 15 Main surface of the plate-shaped component
[0078] 20 end plate
[0079] 30 automated depositing device
[0080] 31 Gripper arm
[0081] 40 optical sensor
[0082] 60 Image of the position marker
[0083] 61 , 65 Areas of the image of the position marking b1 , b3; b11 , ... , b15 Areas of the surface of the plate-shaped component t1 , t3; t11 , .. . , t15 Tangents to areas of the surface of the plate-shaped component d1 , d2 Diameters of circular or ring-shaped areas of the surface of the plate-shaped component d Depth of the depression
[0084] D Thickness of the plate-shaped component
Claims
CLAIMS 1. Plate-shaped component (10, 20), in particular separator plate, Cathode end plate, anode end plate, half-shell of a separator, cathode end plate or anode end plate, or frame for holding a membrane electrode assembly, for a fuel cell stack (100), wherein a surface of the plate-shaped component (10, 20) has at least three adjacent regions (b1, ..., b3; b11, ..., b15) which form at least parts of a position marking (11), and respective adjacent ones of the at least three adjacent regions (b1, ..., b3; b11, ..., b15) are designed such that when the surface is viewed along a predetermined direction, the respective adjacent regions (b1, ..., b3; b11, ..., b15) have different average reflectivities at least in the visible range.
2. Plate-shaped component (10, 20) according to claim 1, wherein the surfaces of the respective adjacent ones of the at least three adjoining regions (b1, ..., b3; b11, ..., b15) have different average roughnesses.
3. Plate-shaped component (10, 20) according to claim 1 or 2, wherein respective tangents (t1, ..., t3; t11, ..., t15) to respective portions of the surfaces of the respective adjacent ones of the at least three adjoining regions (b1, ..., b3; b11, ..., b15) have respective different inclinations relative to a normal to a mean plate plane which corresponds to an averaged height profile of the plate-shaped component (10, 20).
4. Plate-shaped component (10, 20) according to claim 3, wherein respective tangents (t1, ..., t3; t11, ..., t15) are applied to the respective portions of the surfaces of two of the at least three adjacent regions (b1, b3; b11, b15), which are separated by another region of the at least three adjacent regions (b1, b3; b11, b15), have respective different inclinations relative to the normal to the mean plate plane.
5. Plate-shaped component (10, 20) according to one of the preceding claims, wherein two of the at least three adjacent regions (b1, ..., b3; b11, ..., b15), which are separated by at least one other of the at least three adjacent regions (b1, ..., b3; b11, ..., b15), have coplanar surfaces.
6. Plate-shaped component (10, 20) according to one of the preceding claims, wherein at least one region of the three adjacent regions (10, 20) is an annular region.
7. Plate-shaped component (10, 20) according to one of the preceding claims, wherein at least one of the three adjacent regions (b1, ..., b3; b11, ..., b15) has a convex portion or a concave portion.
8. Plate-shaped component (10, 20) according to one of the preceding claims, wherein the at least three adjacent regions (b1, ..., b3; b11, ..., b15) are concentric regions.
9. Method for positioning and / or determining a position and / or orientation of at least one plate-shaped component (10, 20) according to one of the preceding claims, in particular for stacking a plurality of plate-shaped components (10, 20) to form a fuel cell stack (100), wherein the position marking (11) of the plate-shaped component (10, 20) is detected by means of an optical sensor (40) and the position and / or orientation of the plate-shaped component (10, 20) is determined based on the detected position marking (11).
10. The method according to claim 9, wherein the plate-shaped component (10, 20) is positioned based on the determined position and / or orientation of the plate-shaped component (10, 20).
11. The method according to claim 9 or 10, wherein a plurality of the plate-shaped components (10, 20) are stacked to form a fuel cell stack (100), and the alignment of the plate-shaped components (10, 20) is carried out by means of an automated storage device (30) based on the determined positions and / or orientations of the plate-shaped components (10, 20).
12. Fuel cell stack (100) comprising a plurality of plate-shaped components stacked one above the other according to one of claims 1 to 8.
13. Computer-implemented method for aligning at least two plate-shaped components (10, 20) according to one of claims 1 to 8, comprising the steps: Receiving data comprising image data of at least one position marking (11) of a first of the at least two plate-shaped components (10, 20) acquired by means of an optical sensor (40), Evaluating the captured image data of the at least one position marking (11) of the first plate-shaped component (10, 20) in order to determine a position and / or orientation of the first plate-shaped component (10, 20), Receiving data comprising image data of at least one position marking (11) of a second of the at least two plate-shaped components (10, 20) acquired by means of the optical sensor (40), Evaluating the captured image data of the at least one position marking (11) of the second plate-shaped component (10, 20) in order to determine a position and / or orientation of the second plate-shaped component (10, 20), Comparing the determined positions and / or orientations of the first and second plate-shaped components (10, 20), and Outputting a signal to an automated depositing device (30) to cause the automated depositing device (30) to change the position and / or orientation of the second plate-shaped component (10, 20) such that the first and second plate-shaped components (10, 20) are stacked on top of one another such that their positions and / or orientations are aligned with one another.