CN117203371A - Electrode plate for electrolytic system - Google Patents

Abstract

An electrode plate (1) for an electrolysis system (10), made of sheet metal, in particular for the production of hydrogen, has an effective field (3) and a frame region (2) surrounding the effective field, said frame region having a substantially rectangular shape. The frame region (2) is formed on the base plane (E) of the undeformed sheet metal. The active field (3) has an embossing structure (6) in the form of individual embossing elements (14, 15, 16, 17) protruding and recessed from a base plane (E), which embossing structure comprises a plurality of linear embossing strips (14, 15) positioned in a row-and-column arrangement such that the protruding linear embossing strips (14) and the recessed linear embossing strips (15) are formed in an alternating manner in the row direction and in the column direction, wherein all the linear embossing strips (14, 15) of a row are inclined in the same manner with respect to the longitudinal side of the active field (3) and the flow Direction (DR) parallel thereto, and the linear embossing strips (14, 15) of the next row have equal and opposite inclinations.

Description

Electrode plate for electrolytic system

Technical Field

The present invention relates to electrode plates intended for use in an electrolysis system. The invention further relates to a method for producing an electrode plate for an electrolysis system, in particular for hydrogen production.

Background

An apparatus for generating hydrogen by means of electrolysis is described, for example, in EP 2 507,410 B1. The described electrolysis system should be suitable for operation with water taken from a saline, salty or fresh water source. Water is supplied to the carrier gas stream such that at least some of the water in vaporized form is absorbed in the carrier gas stream. The carrier gas stream loaded in this way is finally supplied to the electrolysis device.

EP 1 587 760 B1 discloses an electrolysis cell comprising a plurality of electrolysis plates. The electrolyte sheet is fastened to a groove means in the housing. The housing of the known electrolyzer has an inlet and an outlet allowing fluid to flow through. A plurality of plates are arranged in a stacked form in the housing.

The electrolyte sheet described in DE 199,56,787a 1 comprises an outer, non-conductive frame and a conductive, bipolar graphite sheet mounted therein. A plastic skirt is provided for forcibly guiding the electrolyte solution in the region of the electrolyte supply.

The device of an electrochemical cell known from DE 10 2013 225 159 B4 is provided for the passage of, for example, water or an aqueous electrolyte, which comprises a basic element in the form of a planar structure with a network structure or formed from a porous material. The plurality of basic elements are arranged one on top of the other, wherein the edge regions of the basic elements are connected in a fluid-tight manner by means of a filling.

The various electrochemical systems described in documents WO 2019/121947 A1 and WO 2020/030644 A1 each have an arrangement of a plurality of separator plates defining a fluid space. The electrochemical system described may be a fuel cell or an electrolysis cell.

EP 3 725,916 A1 discloses an electrolytic plate intended for use in a device for generating hydrogen and having openings for the passage of gases, wherein the edges of the openings are covered with a non-conductive material.

A bipolar capacitor is known from EP 3 575 A1, which is provided for the production of hydrogen. The anode and/or cathode of the container is designed as a porous electrode. The membrane of the bipolar vessel is a porous membrane having an inorganic component. The apparatus according to EP 3 575 442 A1 should be suitable for alkaline electrolysis.

For example, in documents WO 2014/144556 A1 and DE 20 2011 102 525 U1 methods are described for incorporating a hydrogen electrolysis system into a more integrated system in which energy and/or medium flow occurs.

Disclosure of Invention

The invention is based on the object of further developing the production of electrolytic plates in the form of electrode plates with respect to the prior art, wherein production-related aspects as well as electrical technology and fluid aspects are taken into account.

According to the invention, this object is achieved by an electrode plate having the features of claim 1. This object is also achieved by a method for producing an electrode plate according to claim 10. The embodiments and advantages of the invention described below in connection with the production method are also applicable, if necessary, to the device, i.e. the electrode plate to be used in the electrolysis device, and also to the production method if necessary.

The electrode plates have a frame region surrounding an effective field over which electrochemical reactions occur in the finished system, i.e., in the electrolyzer. The effective field is composed of three dimensions. In typical embodiments, this does not apply to the box area. The effective field is planar and is formed from an undeformed planar metal sheet that forms the base plane. The effective field, like the frame region and thus the entire electrode plate, has a rectangular, generally non-square, basic shape. A plurality of electrode plates are provided for assembly into a stack of cells.

In the effective field there is an imprint structure in the form of individual imprint elements protruding and recessed from the base plane, comprising a plurality of linear, i.e. straight, imprint bars. The linear embossing stripes are positioned in a row and column arrangement such that the raised and recessed linear embossing stripes are formed in an alternating manner in both the row and column directions, wherein all linear embossing stripes of one row are inclined in the same manner with respect to the longitudinal side of the effective field and with respect to the flow direction of the fluid parallel to this longitudinal side, and the linear embossing stripes of the next row have equal and opposite inclinations. The stamped bars contribute to both mechanical stability and flow conductivity of the electrode plate. They also allow the conduction of current through the metal sheet used. The arrangement of the linear embossing strips in a herringbone pattern enables a particularly uniform flow and fluid distribution with respect to the fluid flowing in the surface area of the electrode plate. Furthermore, the shaping of the metal sheet from the base plane in both directions perpendicular to the base plane gives rise to a great gain in the mechanical stability of the electrode plate, which allows the use of particularly thin metal sheets, in particular in the range from 150 μm to 500 μm.

Additional components of the cell, such as the gas diffusion layer, may abut the linear stamped strips of the electrode plates. The boundary area between the elongated linear embossing strip and the other components is flat, which is advantageous both for mechanical loading and for charge flow. This is particularly important in large scale electrolysis systems for the production of hydrogen.

For example, according to an advantageous embodiment in terms of production technology, the sub-groups of the stamp structures are formed in each case by two row-line stamp strips, with a total of at least four such sub-groups being connected in series. The series connection refers to a flow direction of a fluid or an electrolyte, which in a typical embodiment corresponds to a longitudinal direction of the electrode plates. Variations in which the sub-clusters are made up of more than two rows of linear embossing stripes may also be implemented. In any case, for example, the distance between two sub-clusters may correspond to at least 5% and at most 10% of the projected length of a linear embossing strip, e.g. arranged in a row, measured in the longitudinal direction of the electrode plate.

In addition to the linear embossing strips, the embossing elements can also form embossing points, which have relatively small dimensions compared to the length and width of the effective field of the various possible designs of electrode plates made of sheet metal, for example stainless steel or titanium. For example, at least three raised embossing elements and at least three recessed embossing elements, in particular linear embossing strips, are arranged in each row.

In the region of the inlet and/or outlet of the fluid or electrolyte, i.e. in the first and last row of the embossing structure, the raised linear embossing strips may have a full length, the linear embossing strips of the remaining rows may also have a full length, while the recessed linear embossing strips are designed to be greatly shortened, in particular at most half the length, of the linear embossing strips, wherein the shortening of the recessed linear embossing strips is towards the edges of the embossing structure. In a corresponding manner, the raised linear embossing strips on the input side and/or output side edges of the embossing structure can be shortened, while the recessed linear embossing strips are in an undeployed form. The shortening of one side of the linear embossing strip can in any case be used to bring the components of the electrolytic stack, such as the frame or seal, into surface contact with the electrode plates.

According to a possible further development, the height of the raised linear embossing strips differs from the height of the recessed linear embossing strips, wherein the appearance of the linear embossing strips is "raised" or "recessed" always depending on which side of the metal sheet the linear embossing strips are observed from. The term "imprint depth" is also used instead of "height of the imprint bar". The embossing depth must be measured orthogonal to the base plane of the undeformed sheet metal. The different embossing depths on one side and the other side of the metal sheet lead to an asymmetry of the embossed structure. Such asymmetry can be used to set different flow conditions exclusively on the cathode side and the anode side of the electrode plates. In particular, the difference between the embossing depth given on the cathode side and the embossing depth given on the anode side is greater than the sheet thickness of the metal sheet measured from the base plane of the metal sheet.

In general, the electrode plate can be efficiently produced by a molding process by producing a plurality of individual embossed elements protruding different distances from the surfaces of the undeformed metal sheets on both sides of the electrode plate and forming a herringbone pattern together on each side of the electrode plate.

The electrode plate comprising a structure in the form of a herringbone pattern may be provided with a single layer or a plurality of layers of coating. The entire electrode plate need not be coated in a uniform manner. In particular, the coating can only be present in the effective field and not in the frame region. The frame region may also be coated in a manner other than an effective field.

In all embodiments, in particular, the advantage of the electrode plate is that the three-dimensional double-sided design supports laminar medium flow uniformly distributed over the effective field. The projections and recesses in the effective field can be based on the shape of a sinusoidal curve in a greatly modified manner as long as they protrude from the surface not only in a punctiform manner. In contrast to the sinusoidal profile, there may be a plateau, in particular in a plane at the greatest distance from the surface of the undeformed sheet metal. This applies to both the longitudinal section and the transverse section through the linear embossing strip. In both cases, the sides of the linear embossing strip are inclined at an angle of, for example, 30 ° to 60 ° with respect to the plane in which the surface of the undeformed or not significantly deformed sheet metal lies, as a result of which a trapezoidal shape can be present in the cross section in the longitudinal and transverse directions.

In a plan view of the electrode plate, the individual linear embossing strips may be inclined, for example, at an angle of 45 ° ± 15 °, which is uniform in size with respect to the longitudinal sides of the electrode plate. This, together with the described longitudinal and transverse cross-sectional shape, gives rise to a flow guiding effect designed to avoid dead zones during operation of the electrolyzer, wherein in particular the formation of stationary vortices in the recess is minimized.

According to a modified embodiment, on both sides of an arrangement, in particular a herringbone arrangement, of linear embossing strips, which are placed obliquely with respect to the flow direction of the fluid or electrolyte, there are two rows of embossing elements, for example embossing points, which are arranged on the longitudinal sides of the active field and which are oriented in the direction of the columns of the embossing structure. These embossing elements are small compared to linear embossing bars and are in particular almost punctiform embossing elements, and each is arranged at the edge of the effective field, i.e. in the bar at the transition to the frame region, which has the effect of moderating the flow of the relevant narrow region. Specifically, the flow component orthogonal to the longitudinal direction of the electrode plate is suppressed as compared to the center of the effective field.

Instead of punctiform elevations, embossing elements can also be present in the lateral regions of the effective field, which extend from the inflow region to the outflow region of the fluid or electrolyte, wherein each of the embossing elements forms a V-shape, wherein such V-shaped embossing elements are arranged at the beginning and at the end of each row of linear embossing bars. Here, the V-side of the embossing elements is directed towards the linear embossing stripes arranged in rows. This means that each row of inclined linear embossing strips is enclosed by two V-shaped embossing elements in the manner of a "left bracket" symbol and a "right bracket" symbol. The dimensions of the V-shaped embossing elements, presented as brackets, can be designed in such a way that they are only partially covered by the parts of the electrolytic stack resting on the electrode plates. The part capable of forming the frame step is arranged outside the active surface with channel-like recesses in the form of V-shaped legs protruding from the cover, while the central curve element of each V-shaped embossing element is arranged below the cover. This configuration achieves two advantages: on the one hand, the flow of nonfunctional media at the edges of the effective field is largely prevented; on the other hand, less flow of the medium is allowed through the channels formed by the V-shaped imprinting elements, which prevents accumulation of fluid in the dead zone.

The structure of the electrode plates ensures that the flowing electrolyte or fluid also experiences a component of movement perpendicular to the plane defined by the base plane throughout the effective field. These flow components away from the base plane, or towards the base plane, are produced in particular by the fact that: the linear embossing strips of successive rows in the flow direction are alternately constructed from embossing strips positioned in a first row at a uniform angle relative to the longitudinal direction of the effective field and inclined in the next row at opposite orientations and at the same magnitude of angle, wherein the already mentioned side angles also play a role, which are present for each linear embossing strip and for punctiform as well as for any other embossing elements.

Drawings

Several exemplary embodiments of the invention are described in more detail below with the aid of the accompanying drawings.

In the drawings:

FIG. 1 shows a first exemplary embodiment of an electrode plate for an electrolysis system in plan view;

FIG. 2 shows a second exemplary embodiment of an electrode plate for an electrolysis system in a view similar to FIG. 1;

FIG. 3 shows in plan view details of the stamped structure of the electrode plate;

FIGS. 4 and 5 show the stamped feature in cross-section;

FIG. 6 shows (relative to FIGS. 4 and 5) another plan view of a schematically marked imprint structure with cross-section lines;

fig. 7 shows a perspective view of an electrode plate with V-shaped embossing elements on the longitudinal sides of the active field;

FIG. 8 shows a perspective rear view of an electrode plate with greatly shortened embossing bars in the entrance and exit areas of the active field;

fig. 9 shows the electrode plate according to fig. 7 in a schematic diagram similar to fig. 6;

fig. 10 shows the electrode plate according to fig. 8 in a schematic representation similar to fig. 9.

Detailed Description

The following description refers to all exemplary embodiments, unless otherwise indicated. In all the figures, components corresponding to or having substantially the same function as each other are identified by the same reference numerals.

The electrode plate, generally designated by reference numeral 1, is made of sheet steel and is intended for use in an electrolysis system (not further shown) for hydrogen generation, also referred to simply as electrolysis system 10. With respect to the basic structure and function of such an electrolysis system, reference is made to the prior art cited at the outset.

The electrode plate 1 is formed from sheet metal and has a rectangular, non-square shape, with a planar frame region 2 surrounding a three-dimensionally structured active surface 3. In the frame area 2 there are a plurality of openings 4, 5 of different sizes, which in the exemplary embodiment are circular, and these openings can be used in particular for the passage of media or for the insertion of tie rods to keep the stacks of cells together. The metal sheet is present in the frame area 2 in the shape of an undeformed flat plate. The flat sheet metal, which is not deformed, forms a base plane E (see fig. 5) from which the stamped feature 6 is formed up and down.

In the active surface 3 there are embossed structures 6 protruding from both sides of the base plane E of the electrode plate 1. On the first side 7 of the metal sheet, the embossed structure 6 is referred to as a raised embossed area 8 (see fig. 4) which rises from the base plane E towards the viewer. The raised embossed areas 8 alternate with the depressed embossed areas 9, which also rise from the base plane E but away from the viewer.

The imprinted structures 6 are divided in the form of sub-clusters 11, as can be seen in particular from fig. 3, both with respect to the exemplary embodiment according to fig. 1 and with respect to the exemplary embodiment according to fig. 2. In general, the imprint structure 6 has a row and column pattern in which each sub-cluster 11 comprises two row-line imprint bars 14, 15.

In operating the electrolysis system 10, the flow direction of the electrolyte, denoted DR, corresponds to the longitudinal direction of the effective field 3 and the entire electrode plate 1. The individual embossing strips 14, 15 are inclined at a uniform angle α of 45 ° ± 15 ° with respect to the flow direction DR. The overall length of each embossing strip 14, 15 is denoted by L and the length projected transverse to the flow direction DR, i.e. the optical shortening length, is denoted by L'. The distance denoted a ' between the two sub-clusters 11 is measured in the flow direction DR like the length L ' and is 5% to 10% of the projected length L '. The length L, L' is also referred to as the sheeting length or projected sheeting length.

In addition to the linear embossing strips 14, 15, i.e. in addition to the lamellae, embossing points 16, 17 in the form of raised points 16 and recessed points 17 starting from the base plane E are also formed in the active surface 3 in the embodiment according to fig. 1 and 2. In summary, the linear embossing strips 14, 15 and the embossing points 16, 17 are also referred to as embossing elements.

In all figures, the embossing elements 14, 16 belonging to the raised embossing area 8 are identified by solid lines and the recessed embossing elements 15, 17 are identified by dashed lines. At the beginning and end of each row formed by linear embossing bars 14, 15 sloping in the same direction, there are embossing points 16, 17 in the case of fig. 1 and 2.

Including these optional embossing points 16, 17, raised embossing elements 14, 16 and recessed embossing elements 15, 17 are alternately arranged in each row. In substantially the same way, the raised linear embossing strips 14 and the recessed linear embossing strips 15 alternate throughout the columns formed by the linear embossing strips 14, 15 and extending in the longitudinal direction of the electrode plate 1, so that in each case there is in total one arrangement of embossing strips 14, 15 in a herringbone pattern. Preferably, the number of subsets 11 is at least 2, in particular more than 5.

In contrast to the exemplary embodiment according to fig. 1, in the exemplary embodiment according to fig. 2 there is a row of raised imprint spots 16 on each of the two longitudinal sides of the effective field 3. These rows are also referred to as edge clusters 13 of the imprint structure 6. Unlike the configuration outlined in fig. 2, it is also possible to form first edge clusters 13 of alternating raised and recessed imprint points 16, 17 starting from the base plane E. In any case, depending on the imprint points 16, 17 from which the edge clusters 13 are established, which can be attributed entirely to the raised imprint regions 8 or entirely to the recessed imprint regions 9, are arranged linearly alongside these imprint points 16, 17, which mark the beginning and end of each row on the linear imprint bars 14, 15 in the manner already described.

As can be seen from the sectional views A-A and B-B (see fig. 6) in fig. 4 and 5 in relation to all other figures, the relief imprint 8 is defined by h ₁ Represented impression depth, i.e. impression element14. 16 and the height of the depressed imprint region 9 ₂ The embossing depths represented are significantly different, i.e. the difference is greater than the sheet thickness of the electrode plate 1, denoted by s. In the present case, the first side 7 of the electrode plate 1 is located in the x-y plane. The embossing elements 14, 15, 16, 17 extend in the z-direction. The sides indicated by 18 at both ends of each embossing bar 15, 16 are positioned obliquely with respect to the x-y plane at an angle β of 45 deg. ±15 deg..

In fig. 5, a section B-B is shown, which is transverse to the extension of the embossing strips 15, 16 (see fig. 6), the structure width in the raised embossing area 8 being denoted B ₁ Indicating and recessing the width of the structure in the embossed area 9 with B ₂ And (3) representing. Furthermore, an angle γ is shown in fig. 5, wherein the inclination of the side face 18 on the longitudinal side of the embossing bars 15, 16 in this case corresponds to the difference between 180 ° and the angle γ and is similar to the angle β in the range of 30 ° to 60 °.

The trapezoidal profile of the linear embossing strips 14, 15 can be seen in both fig. 4 and 5. Lying in a plane parallel to the first side 7 and spaced apart from the first side by h ₁ Or h ₂ The plateau of the linear embossing strips 14, 15 is indicated by 19 in fig. 5. Unlike the idealized representation according to fig. 4 and 5, the transition between the platform 19 and the side 18 and the transition between the side 18 and the first side 7 can be circular. All embossing elements 14, 15, 16, 17 are produced by a molding process. The coating may be applied to the active surface 3 before and/or after shaping.

As far as the profile of the linear embossing strips 14, 15 is concerned, there is no difference between the embodiments according to fig. 4 and 5 and the exemplary embodiments according to fig. 7 to 10.

In the embodiment according to fig. 7 and 9, the edge cluster 13 is given by V-shaped embossing elements 20, 21. Here, at the beginning and end of each row on the slanted linear embossing bars 14, 15, the embossing element 20 appears as a printed "left bracket" symbol and the embossing element 20 appears as a printed "right bracket" symbol. As in fig. 6, the flow direction DR corresponds to the x-direction in fig. 9. As can be seen from fig. 7, in the side regions of the effective field 3, next to the V-shaped embossing elements 20, 21, embossing strips 22, 23 are present which are shortened, recessed or raised compared to the embossing strips 14, 15. The length of these shortened embossing strips 22, 23 is greater than half the full length L of the remaining embossing strips 14, 15.

In addition to the modified side regions of the stamp structure 6, in the exemplary embodiment according to fig. 8 and 10, there are also modifications in the entrance region and in the exit region of the effective field 3. In contrast to fig. 1 and 2 and fig. 7, fig. 8 shows one side of the electrode plate 1, which is arbitrarily referred to as "rear side". In fig. 10, as in fig. 6 and 9, the "front side" of the electrode plate 1 is symbolically shown. As can be seen from fig. 8, a greatly shortened, concave linear embossing strip 24 is arranged in each case in the entrance region of the active field 3 in such a way that it is between two convex linear embossing strips 14. The length of the shortened linear embossing strip 24 is less than half the uniform length L of the other linear embossing strips 14, 15. This creates a space at the edge of the stamped feature 6 in which a flat contact can be made between the component (not shown) and the first side 7 of the electrode plate 1, with an overlap between the non-shortened linear stamped strip 14 and the mentioned component. The same applies to the outlet region of the electrolyte, which is provided on the right-hand edge of the detail of the electrode plate 1 shown with respect to the arrangement according to fig. 1. In the case of fig. 8 and 10, all four edge regions of the entire rectangular stamp structure 6 are modified compared to the central region of the stamp structure 6 formed by the linear stamp strips 14, 15 only.

List of reference numerals

1. Electrode plate

2. Frame region

3. Effective field

4. Openings in the frame area (Large)

5. Openings in the frame area (Small)

6. Embossing structure

7. First side of the metal sheet

8. Raised imprint region (from the base plane)

9. Depressed imprint region (from the base plane)

10. Electrolysis system

11. Sub-clusters

12. Free space between two sub-clusters

13. Edge cluster

14. Raised line embossing stripes (from the base plane)

15. Concave linear embossing stripes (from the base plane)

16. Raised imprint point (starting from the base plane)

17. Concave coining point (from the base plane)

18. Side of embossing element

19. Platen for imprinting elements

20 V-shaped stamping element

21 V-shaped stamping element

22. Embossing strip shortened and recessed in the side regions

23. Shortened and raised embossing strips in the side regions

24. Greatly shortened embossing strip for inlet or outlet area

Alpha, beta, gamma angle

Distance between A' subsets

B ₁ Structure width of raised embossed area

B ₂ Structure width of recessed imprint region

DR flow direction

h ₁ Height of raised imprint area

h ₂ Height of recessed embossed area

L sheet length

Length of (projected) sheet in the L' flow direction

s-piece thickness

E base plane

Claims (10)

1. An electrode plate (1) for an electrolysis system (10) made of sheet metal, having a frame region (2) which surrounds an effective field (3) and has a rectangular basic shape as the effective field (3), and wherein the frame region (2) is designed in the base plane (E) of the sheet metal which is undeformed, wherein the effective field (3) has an embossing structure (6) in the form of individual embossing elements (14, 15, 16, 17) which project and are recessed from the base plane (E), which embossing structure comprises a plurality of linear embossing strips (14, 15) which are positioned in a row-and-column arrangement such that the projecting linear embossing strips (14) and the recessed linear embossing strips (15) are formed in an alternating manner both in the row direction and in the column direction, wherein all the linear embossing strips (14, 15) of a row have the same linear inclination (14, 15) with respect to the longitudinal side of the effective field (3) and in a flow Direction (DR) parallel to the longitudinal side, and in an equal and opposite linear inclination.

2. Electrode plate (1) according to claim 1, characterized in that the sub-clusters (11) of the stamping structures (6) are formed by two row-line stamping bars (14, 15), wherein a total of at least four such sub-clusters (11) are connected in series, and at least three raised line stamping bars (14) and at least three recessed line stamping bars (15) are arranged in each row.

3. Electrode plate (1) according to claim 2, characterized in that the distance (a ') between two sub-clusters (11) corresponds to at least one-two and at most one-tenth of the projection length (L') of the linear embossing strips (14, 15) arranged in a row measured in the longitudinal direction.

4. An electrode plate (1) according to any one of claims 1 to 3, characterized in that in the first and last rows of the embossing structures (6) the raised linear embossing strips (14) have a full length (L) and alternate with shortened linear embossing strips (24), the remaining rows of linear embossing strips (14, 15) also having a full length, wherein the shortening of these linear embossing strips (24) is located in the entrance and exit areas of the effective field (3) towards the edge of the embossing structures (6).

5. Electrode plate (1) according to any one of claims 1 to 4, characterized in that, starting from the base plane (E), the height (h ₁ ) Height (h) of the concave linear embossing strip (15) ₂ ) Is greater than the sheet thickness(s) of the electrode plate (1).

6. Electrode plate (1) according to any one of claims 1 to 5, characterized in that the linear embossing strips (14, 15) are inclined at an angle (α) of 45 ° ± 15 ° with respect to the flow Direction (DR) and are shaped in a trapezoidal manner along both the longitudinal and transverse directions of the linear embossing strips (14, 15), wherein the side faces (18) of the linear embossing strips (14, 15) are inclined at an angle (β;180 ° - γ) of 45 ° ± 15 ° with respect to the first side (7) of the electrode plate (1).

7. Electrode plate (1) according to any one of claims 1 to 6, characterized in that two rows of embossing elements (16, 17, 20, 21) flanking the arrangement of all linear embossing strips (14, 15) in the column direction border the frame area (2) and have a uniform embossing direction.

8. Electrode plate (1) according to claim 7, characterized in that the embossing elements (16, 17) bordering the frame area (2) are designed as embossing points.

9. Electrode plate (1) according to claim 7, characterized in that the embossing elements (20, 21) bordering the frame area (2) each form 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-bracket" symbol and a "right-bracket" symbol.

10. A method for producing an electrode plate (1) made of sheet metal according to any one of claims 1 to 9, wherein a plurality of individual stamping elements (14, 15, 16, 17) are produced by molding, which stamping elements protrude beyond a base plane (E) by different distances on both sides of the electrode plate (1) and together form a herringbone pattern of linear stamping strips (14, 15) on each side of the electrode plate (1).