Electrode plate for an electrolysis plant

Description

[0001] The invention relates to an electrode plate intended for use in an electrolysis system. Furthermore, the invention relates to a method for producing an electrode plate for an electrolysis system, in particular for producing hydrogen.

[0002] A device for generating hydrogen by electrolysis is described, for example, in EP 2 507 410 B1. The described electrolysis system is intended to be suitable for operation with water taken from a salt, brackish, or freshwater source. The water is fed into a carrier gas stream so that at least a portion of the water is absorbed in evaporated form by the carrier gas stream. The thus-charged carrier gas stream is finally fed to an electrolyzer.

[0003] EP 1 587 760 B1 discloses an electrolysis cell comprising a plurality of electrolysis plates. The electrolysis plates are mounted on grooves within a housing. The housing of the known electrolysis cell has an inlet and an outlet to allow the flow of a fluid. A plurality of plates are arranged in a stacked manner within the housing.

[0004] An electrolysis plate described in DE 199 56 787 A1 consists of an outer, non-conductive frame and an electrically conductive, bipolar graphite plate mounted within it. Plastic aprons are provided to force the flow of electrolyte solutions in the electrolyte supply area.

[0005] An arrangement of electrochemical cells known from DE 10 2013 225 159 B4, which is intended, for example, for the conduction of water or aqueous electrolytes, comprises base elements in the form of flat structures that have a mesh structure or are made of a porous material. Several base elements are arranged one above the other, with edge regions of the base elements being connected in a fluid-tight manner using a filling compound.

[0006] Various electrochemical systems described in documents WO 2019 / 121947 A1 and WO 2020 / 030644 A1 each comprise arrangements of multiple separator plates that define fluid spaces. The electrochemical systems described can be fuel cells or electrolysis cells.

[0007] EP 3 725 916 A1 discloses an electrolysis plate intended for use in a device for generating hydrogen, which plate has an opening for the passage of gas, wherein edges of the opening are covered with an electrically non-conductive material.

[0008] EP 3 575 442 A1 discloses a bipolar electrical vessel intended for the production of hydrogen. The anode and / or cathode of the vessel is designed as a porous electrode. A membrane of the bipolar vessel is a porous membrane with inorganic components. The device according to EP 3 575 442 A1 is said to be suitable for alkaline electrolysis. Methods for integrating hydrogen electrolysis systems into more comprehensive systems involving energy and / or media flow are described, for example, in documents WO 2014 / 144556 A1 and DE 20 2011 102 525 U1.

[0009] US 6,586,128 discloses an electrode plate for an electrolysis system made of sheet metal, comprising a frame region surrounding an active field, which, like the active field, has a rectangular basic shape, and wherein the frame region is formed in a base plane of the undeformed metal sheet. The active field has an embossed structure (75, 76) in the form of individual embossed elements with different recesses starting from the base plane, including a plurality of wave-like embossed strips, which are positioned in a row and column arrangement such that alternatingly recessed linear embossed strips are formed in both the row and column directions. All embossed strips of a row are equally inclined relative to the longitudinal sides of the active field and a flow direction parallel thereto, and the embossed strips (14, 15) of the next row have the same absolute inclination. (see D1, Figure 6, column 8, lines 20-31). A similar but completely linear electrode plate is made of Figure 4 known.

[0010] The invention is based on the object of further developing the production of electrolysis plates in the form of electrode plates compared to the prior art, taking into account manufacturing as well as electrotechnical and fluidic aspects.

[0011] This object is achieved according to the invention by an electrode plate having the features of claim 1. The object is also achieved by a method for producing an electrode plate according to claim 10. Configurations and advantages explained below in connection with the production method also apply mutatis mutandis to the device, that is to say to the electrode plate to be used in an electrolyzer, and vice versa.

[0012] The electrode plate has a frame area surrounding an active field, where electrochemical reactions take place in the finished system, i.e., the electrolyzer. The active field has a three-dimensional structure. In typical designs, this is not the case for the frame area. It is flat and is formed by undeformed, flat metal sheet that forms a base plane. The active field, like the frame area and thus the entire electrode plate, has a rectangular, typically non-square, basic shape. Several electrode plates are designed to be assembled into a stack of electrolysis cells.

[0013] The active field contains an embossed structure in the form of individual, raised and recessed embossed elements, starting from the base plane, including a multitude of linear, i.e., rectilinear embossed strips. The linear embossed strips are positioned in a row and column arrangement such that alternating raised and recessed linear embossed strips are formed in both the row and column directions. All linear embossed strips in a row are equally inclined relative to the long sides of the active field and a parallel flow direction for fluids, while the linear embossed strips in the next row have the opposite, equal inclination. The embossed strips contribute both to the mechanical stability of the electrode plate and to flow conduction. Furthermore, they enable the conduction of electrical currents via the inserted metal sheet.The arrangement of the linear embossing strips, which is arranged in a herringbone pattern, enables a particularly uniform flow and fluid distribution of the fluids flowing past the surface of the electrode plate. Furthermore, the forming of the metal sheet from the base plane in both directions perpendicular to the base plane results in a significant increase in the mechanical stability of the electrode plate, allowing the use of particularly thin metal sheets, especially in the range of 150 µm to 500 µm.

[0014] Other components of the electrolysis cells, such as gas diffusion layers, can be adjacent to the linear embossed strips of the electrode plate. The boundary areas between the elongated linear embossed strips and the other components are flat, which is advantageous both in terms of mechanical stress and the flow of electrical charges. This is particularly relevant for large-scale electrolysis plants for the production of hydrogen.

[0015] According to a manufacturing-technically advantageous embodiment, a sub-cluster of the embossed structure is formed by two rows of linear embossing strips, with a total of at least four such sub-clusters connected in series. The series connection refers to the flow direction of the fluid or electrolyte, which in a typical embodiment corresponds to the longitudinal direction of the electrode plate. Variants are also feasible in which a sub-cluster is constructed from more than two rows of linear embossing strips. In any case, the distance between two sub-clusters can correspond, for example, to at least 5% and at most 10% of the projected length of the linear embossing strips arranged in a row, measured in the longitudinal direction of the electrode plate.

[0016] The embossed elements, which can represent not only linear embossed bars but also embossed points, have comparatively small dimensions compared to the length and width of the active field in numerous possible designs of the electrode plate formed from sheet metal, for example, stainless steel or titanium. For example, at least three raised and at least three recessed embossed elements, in particular linear embossed bars, are arranged in each row.

[0017] In the inlet and / or outlet areas of the fluid or electrolyte, i.e., in the first and last row of the embossed structure, the raised linear embossed bars can have the full length, which is also the case with the linear embossed bars in the remaining rows, whereas the recessed linear embossed bars are designed as significantly shortened linear embossed bars, in particular at most half as long, with the shortening of the recessed linear embossed bars occurring towards the edge of the embossed structure. Similarly, it is possible to shorten the raised linear embossed bars at the inlet and / or outlet edges of the embossed structure, while leaving the recessed linear embossed bars unshortened. The one-sided shortening of the linear embossed bars can always be used to bring a component of the electrolysis stack, for example, a frame or a seal, into surface contact with the electrode plate.

[0018] According to a possible refinement, the height of the raised linear embossing strips differs from the height of the recessed linear embossing strips, whereby the appearance of a linear embossing strip as "raised" or "recessed" always depends on which side of the metal sheet the linear embossing strip is viewed from. Instead of "height of the embossing strips," the term "embossing depth" is also used. The embossing depth is measured orthogonally to the base plane of the undeformed metal sheet. The differing embossing depths on one side and the other of the metal sheet result in an asymmetry of the embossed structure. This asymmetry can be used to specifically adjust different flow conditions on the cathodic and anodic sides of the electrode plate.In particular, the difference between the embossing depth given on the cathodic side and the embossing depth given on the anodic side is more than the sheet thickness of the metal sheet measured from the base plane of the metal sheet.

[0019] In general, the electrode plate can be efficiently manufactured by forming processes in which a large number of individual embossed elements are produced which protrude to different extents from the surfaces of the undeformed metal sheet on both sides of the electrode plate and together describe a herringbone pattern on each side of the electrode plate.

[0020] The electrode plate, including the herringbone pattern, can be coated with a single or multi-layer coating. This does not necessarily mean that the entire electrode plate is coated uniformly. In particular, a coating can be applied exclusively to the active field, but not to the frame area. It is also possible to coat the frame area in a different way than the active field.

[0021] In all embodiments, a particular advantage of the electrode plate is that a three-dimensional, double-sided design supports a laminar media flow evenly distributed across the active field. The elevations and depressions in the active field, provided they do not merely protrude from the surface as points, can be highly modified to resemble a sinusoidal shape. In contrast to a sinusoidal profile, plateaus can be formed that lie in planes that are maximally removed from the surface of the undeformed metal sheet. This applies to both the longitudinal section and the cross-section through a linear embossed strip.In both cases, flanks of the linear embossed strips are inclined, for example, by an angle of 30° to 60° relative to the plane in which the non-deformed or not significantly deformed surface of the metal sheet lies, which can result in a trapezoidal design in both the longitudinal and transverse directions.

[0022] In a top view of the electrode plate, the individual linear embossed strips can, for example, be inclined at a uniform angle of 45° ± 15° relative to the long sides of the electrode plate. Together with the described longitudinal and cross-sectional design, this results in a flow-guiding effect designed to prevent dead spaces during electrolyzer operation, particularly minimizing the formation of stationary vortices in recesses.

[0023] According to a modified embodiment, the arrangement, in particular a herringbone-like arrangement, of the linear embossed strips arranged obliquely to the flow direction of the fluid or electrolyte is flanked by two rows of embossed elements, for example embossed points, located on the long sides of the active field and aligned in the column direction of the embossed structure. These embossed elements, which are small compared to the linear embossed strips and in particular almost point-like, are located in a strip at the edge of the active field, i.e., at the transition to the frame area. They have the effect of calming the flow in the relevant narrow areas, in particular damping flow components orthogonal to the longitudinal direction of the electrode plate compared to the center of the active field.

[0024] Instead of point-like elevations, embossed elements can also be present in the lateral areas of the active field, which extend from the inflow area to the outflow area of ​​the fluid or electrolyte. Each of these embossed elements can form a V-shape, with one such V-shaped embossed element located at the beginning and end of each row of linear embossed bars. The V-shaped limbs of the embossed elements are directed toward the linear embossed bars arranged in a row. This means that each row of inclined linear embossed bars is enclosed by two V-shaped embossed elements, resembling an "open angle bracket" symbol and a "closed angle bracket" symbol. The V-shaped embossed elements, which appear as angle brackets, can be dimensioned such that they are only partially covered by a component of the electrolysis stack resting on the electrode plate.The component that can form a frame step is located outside the active area, with the groove-like recesses, which are in the form of V-shaped limbs, protruding from the cover, while the central bend of each V-shaped embossed element is located beneath the cover. This configuration achieves two advantages: Firstly, a non-functional media flow at the edge of the active area is largely prevented; secondly, a small media flow is permitted through the channels formed by the V-shaped embossed elements, thus preventing the accumulation of fluids in dead spaces.

[0025] Throughout the active field, the structuring of the electrode plate ensures that the flowing electrolyte or fluid also experiences a movement component normal to the plane defined by the base plane. These flow components away from the base plane—or toward the base plane—are generated, among other things, by the fact that successive rows of linear embossed bars in the flow direction are alternately constructed from embossed bars. In a first row, these bars are positioned at a uniform angle to the longitudinal direction of the active field, and in the following row, they are also inclined with the opposite orientation and the same angle. The aforementioned flank angles, which are present in every linear embossed bar and also in the punctiform and any other embossed elements, also play a role.

[0026] Several embodiments of the invention are explained in more detail below with reference to a drawing. In the drawings: Fig. 1 a first embodiment of an electrode plate for an electrolysis plant in plan view, Fig. 2 a second embodiment of an electrode plate for an electrolysis plant in view analogous Fig. 1 , Fig. 3 a detail of an embossed structure of an electrode plate in plan view, Fig. 4 and 5 the embossed structure in sectional views, Fig. 6 another plan view of the embossed structure with schematic marking of the cutting lines (to Fig. 4 and 5 ), Fig. 7 in perspective view an electrode plate with V-shaped embossed elements on the long sides of the active field, Fig. 8 in perspective, rear view an electrode plate with greatly shortened embossed strips in the inlet and outlet area of ​​the active field, Fig. 9 the electrode plate according to Fig. 7 in schematic view analog Fig. 6, Fig. 10the electrode plate according to Fig. 8 in schematic view analog Fig. 9 .

[0027] Unless otherwise stated, the following explanations refer to all exemplary embodiments. Corresponding or essentially equivalent parts are identified by the same reference numerals in all figures.

[0028] An electrode plate, designated overall by reference numeral 1, is made of sheet steel and intended for use in an electrolysis system (not shown) for hydrogen production, also referred to as electrolysis system 10. Regarding the basic structure and function of such electrolysis systems, reference is made to the prior art cited above.

[0029] The electrode plate 1 is made of a metal sheet and has a rectangular, not square, shape, with a flat frame area 2 surrounding a three-dimensionally structured active surface 3. In the frame area 2, there are several openings 4, 5 of different sizes, which are circular in the exemplary embodiment and can be used, among other things, for the passage of media or for inserting tension rods to hold together a stack of electrolysis cells. The metal sheet is undeformed in the frame area 2 in a flat plate shape. The undeformed, flat metal sheet forms a base plane E (see Figure 5 ), from which the embossed structures 6 are formed upwards and downwards from the base plane E.

[0030] In the active surface 3, there is an embossed structure 6, which protrudes from the base plane E of the electrode plate 1 on both sides. On a first side 7 of the metal sheet, the embossed structure 6 is provided as a raised embossed area 8 (see Figure 4 ), which rises from the base plane E towards the viewer. The raised embossed areas 8 alternate with depressed embossed areas 9, which also rise from the base plane E, but away from the viewer.

[0031] The embossed structure 6 is structured in the form of sub-clusters 11, as can be seen in particular from the Fig. 3 which refers to both the embodiment according to Fig. 1 as well as the embodiment according to Fig. 2 Overall, a row-column pattern of the embossed structure 6 is given, with each sub-cluster 11 comprising two rows of linear embossed strips 14, 15.

[0032] During operation of the electrolysis system 10, the flow direction of the electrolyte, designated DR, corresponds to the longitudinal direction of the active field 3 and the entire electrode plate 1. Relative to the flow direction DR, the individual embossed strips 14, 15 are inclined by a uniform angle α of 45° ± 15°. The full length of each embossed strip 14, 15 is designated L, and the length projected transversely to the flow direction DR, i.e., optically shortened, is designated L'. The distance between two sub-clusters 11, designated A', like the length L', is to be measured in the flow direction DR and amounts to 5% to 10% of the projected length L'. The lengths L, L' are also referred to as the lamella length and the projected lamella length, respectively.

[0033] In addition to the linear embossed strips 14, 15, i.e. lamellae, in the active surface 3 in the embodiments according to the Figures 1 and 2also embossed points 16, 17 are formed in the form of raised points 16 and depressed points 17 starting from the base plane E. In summary, the linear embossed strips 14, 15 and embossed points 16, 17 are also referred to as embossed elements.

[0034] In all figures, the embossed elements 14, 16 belonging to the raised embossed area 8 are marked with solid lines and the recessed embossed elements 15, 17 with dashed lines. At the beginning and end of each line, which is formed by linear embossed strips 14, 15 arranged in the same direction, there is a Figures 1 and 2 a stamping point 16, 17.

[0035] Including these optional embossing points 16, 17, raised embossing elements 14, 16 and recessed embossing elements 15, 17 are arranged alternately in each row. In principle, a raised linear embossing strip 14 and a recessed linear embossing strip 15 alternate in the columns formed by the linear embossing strips 14, 15 and extending in the longitudinal direction of the electrode plate 1, so that in all cases, the embossing strips 14, 15 are arranged in a herringbone pattern. Preferably, there are at least 2 subclusters 11, in particular more than 5.

[0036] In contrast to the embodiment according to Fig. 1 is located in the embodiment according to Fig. 2 on each of the two long sides of the active field 3 there is a row of raised embossed points 16. These rows are also referred to as edge clusters 13 of the embossed structure 6. Deviating from the Fig. 2In the embodiment outlined, a first edge cluster 13 could also be formed from - starting from the base plane E - alternating raised embossed points 16 and depressed embossed points 17. In any case, the embossed points 16, 17 from which the edge clusters 13 are constructed, each of which is either completely assigned to the raised embossed area 8 or completely to the depressed embossed area 9, are arranged in a line next to those embossed points 16, 17 which, in the manner already described, mark the beginning and end of each row of linear embossed strips 14, 15.

[0037] As can be seen from the sectional views AA and BB (compare Figure 6 ) in the Figures 4 and 5, which refer to all other figures, the embossing depth of the raised embossed area 8, i.e. the height of the embossed elements 14, 16, differs significantly, namely by more than the sheet thickness of the electrode plate 1, designated s, from the embossing depth of the recessed embossed area 9, designated h 2. In the present case, the first side 7 of the electrode plate 1 lies in the xy plane. The embossed elements 14, 15, 16, 17 extend in the z direction. The flanks designated 18 at the two ends of each embossed strip 15, 16 are inclined to the xy plane by an angle β of 45° ± 15°.

[0038] In Fig. 5 , which shows a section BB transverse to the extension of the embossed strip 15, 16 (compare Figure 6 ), the structural width in the raised embossed area 8 is indicated by B 1 and the structural width in the recessed embossed area 9 is indicated by B 2. Furthermore, in Fig. 5an angle γ is drawn, whereby the inclination of the flanks 18 on the long sides of the embossed strip 15, 16 in this case corresponds to the difference between 180° and the angle γ and, like the angle β, lies in the range of 30° to 60°.

[0039] Both in Fig. 4 as well as in Fig. 5 a trapezoidal profile of the linear embossing strips 14, 15 is visible. Plateaus of the linear embossing strips 14, 15, which lie in planes parallel to the first side 7 and spaced from it by h 1 or h 2, are in Fig. 5 marked 19. Deviating from the idealized representations according to the Figures 4 and 5The transitions between the plateaus 19 and the flanks 18, as well as the transitions between the flanks 18 and the first side 7, can be rounded. All embossed elements 14, 15, 16, and 17 are manufactured by forming processes. Coatings can be applied to the active surface 3 before and / or after forming.

[0040] As far as the profiling of the linear embossing strips 14, 15 is concerned, there are no differences between the design according to the Figures 4 and 5 and the examples of implementation according to the Figures 7 to 10 given.

[0041] In the embodiment according to the Figures 7 and 9The edge clusters 13 are defined by V-shaped embossed elements 20, 21. The embossed element 20 appears as a typographic symbol "open angle bracket" and the embossed element 20 as a typographic symbol "closed angle bracket" at the beginning and end of each line on slanted linear embossed strips 14, 15. The flow direction DR corresponds in Fig. 9 , as well as in Fig. 6 , the x-direction. As can be seen from Fig. 7 As can be seen, in the side areas of the active field 3, directly next to the V-shaped embossed elements 20, 21, there are shortened, recessed or raised embossed strips 22, 23 compared to the embossed strips 14, 15. The length of these shortened embossed strips 22, 23 is more than half the full length L of the other embossed strips 14, 15.

[0042] In addition to the modified side areas of the embossed structure 6, in the embodiment according to Fig. 8 and 10There were also modifications in the inlet and outlet areas of the active field 3. In contrast to the Figures 1 and 2 as well as to Figure 7 shows the Figure 8 the side of the electrode plate 1, arbitrarily designated as the "back side". In Figure 10 is, as in the Figures 6 and 9 , the "front" of the electrode plate 1 is shown in a symbolic manner. As can be seen from Fig. 8As can be seen, in the inlet area of ​​the active field 3, a greatly shortened, recessed linear embossing strip 24 is arranged between each two raised linear embossing strips 14. The length of the shortened linear embossing strips 24 is less than half of the otherwise uniform length L of the linear embossing strips 14, 15. This creates space at the edge of the embossed structure 6, in which a surface contact can be established between a component (not shown) and the first side 7 of the electrode plate 1, wherein an overlap is provided between the unshortened linear embossing strips 14 and the said component. The same applies to the outlet area of ​​the electrolyte, which, with respect to the arrangement according to Fig. 1 , located at the right edge of the section shown in the electrode plate 1. In the case of Fig. 8 and 10Thus, all four edge areas of the overall rectangular embossed structure 6 are modified compared to the central area of ​​the embossed structure 6, which is formed exclusively from the linear embossed strips 14 15. List of reference symbols

[0043] 1Electrode plate 2Frame area 3Active field 4Opening (large) in the frame area 5Opening (small) in the frame area 6Embossing structure 7First side of the metal sheet 8Raised embossing area (starting from the base plane) 9Recessed embossing area (starting from the base plane) 10Electrolysis system 11Sub-cluster 12Free space between two sub-clusters 13Edge cluster 14Raised linear embossing bar (starting from the base plane) 15Recessed linear embossing bar (starting from the base plane) 16Raised embossing point (starting from the base plane) 17Recessed embossing point (starting from the base plane) 18Flank of an embossed element 19Plateau of an embossed element 20V-shaped embossing element 21V-shaped embossing element 22Shortened recessed Embossed strip in the side area 23 shortened raised embossed strip in the side area 24 significantly shortened embossed strip in the inlet or outlet area α, β, γAngle A'Distance between sub-clusters B 1 Structure width in the raised embossed area B 2 Structure width in the recessed embossed area DRFlow direction h 1 Height of the raised embossed area h 2 Height of the recessed embossed area LLipella length L'Lipella length (projected) in flow direction sSheet thickness EBase plane

Claims

1. An electrode plate (1) for an electrolysis system (10) made of sheet metal, having a frame region (2) which surrounds an active field (3) and which, like the active field (3), has a rectangular basic shape, and wherein the frame region (2) is formed in a base plane (E) of the undeformed sheet metal, wherein the active field (3) has an embossing structure (6) in the form of individual embossing elements (14, 15, 16, 17) which are raised and recessed with respect to the base plane (E), including a plurality of linear embossing strips (14, 15) which are positioned in a row and column arrangement such that raised linear embossing strips (14) and recessed linear embossing strips (15) are formed in an alternating manner in each case in both the row and column directions, wherein all of the linear embossing strips (14, 15) of a row are inclined in the same way with respect to the longitudinal sides of the active field (3) and a flow direction (DR) parallel thereto, and the linear embossing strips (14, 15) of the next row assume the opposite inclined position of equal absolute value.

2. The electrode plate (1) according to claim 1, characterized in that a subcluster (11) of the embossing structure (6) is formed by two rows of linear embossing strips (14, 15) in each case, wherein a total of at least four such subclusters (11) are connected in series and at least three raised linear embossing strips (14) and at least three recessed linear embossing strips (15) are arranged in each row.

3. The electrode plate (1) according to claim 2, characterized in that the distance (A') between two subclusters (11) corresponds to at least one twentieth and at most one tenth of the projected length (L') to be measured in the longitudinal direction of the linear embossing strips (14, 15) arranged in a row.

4. The electrode plate (1) according to any one of claims 1 to 3, characterized in that in the first and in the last row of the embossing structure (6) the raised linear embossing strips (14) have the full length (L) which is also provided for the linear embossing strips (14, 15) of the remaining rows and alternate with shortened linear embossing strips (24), wherein the shortening of these linear embossing strips (24) is provided in the inlet and outlet region of the active field (3) towards the edge of the embossing structure (6).

5. The electrode plate (1) according to any one of claims 1 to 4, characterized in that the height (h1) of the raised linear embossing strips (14) differs from the height (h2) of the recessed linear embossing strips (15) with respect to the base plane (E) by more than the sheet thickness (-es) of the electrode plate (1).

6. The electrode plate (1) according to any one of claims 1 to 5, characterized in that the linear embossing strips (14, 15) are inclined by an angle (α) of 45° ± 15° with respect to the flow direction (DR) and are contoured in a trapezoidal shape both in the longitudinal direction and in the transverse direction of the linear embossing strips (14, 15), wherein flanks (18) of the linear embossing strips (14, 15) are inclined by an angle (β; 180°-y) of 45° ± 15° with respect to a first side (7) of the electrode plate (1).

7. The electrode plate (1) according to any one of claims 1 to 6, characterized by two rows of embossing elements (16, 17, 20, 21) flanking the arrangement of all linear embossing strips (14, 15) in the column direction and adjoining the frame region (2) and having a uniform embossing direction.

8. The electrode plate (1) according to claim 7, characterized in that the embossing elements (16, 17) adjoining the frame region (2) are designed as embossing points.

9. The electrode plate (1) according to claim 7, characterized in that the embossing elements (20, 21) adjoining the frame region (2) each describe a V-shape, wherein each row of inclined linear embossing strips (14, 15) is enclosed by two V-shaped embossing elements (20, 21) in the manner of a "left angle bracket" sign and a "right angle bracket" sign.

10. A method for producing an electrode plate (1) from sheet metal according to any one of claims 1 to 9, wherein a plurality of individual embossing elements (14, 15, 16, 17) is produced by forming, which embossing elements project to different extents beyond the base plane (E) on both sides of the electrode plate (1) and together describe a herringbone pattern of linear embossing strips (14, 15) on each side of the electrode plate (1).