Flexible support electrolytic cell

Abstract

The utility model discloses a flexible supporting electrolytic bath, and belongs to the technical field of water electrolysis hydrogen production, the flexible supporting electrolytic bath comprises at least two flat plates, a plurality of flexible supporting pieces, a plurality of active electrode nets and a plurality of diaphragm cloths, and the at least two flat plates are arranged at intervals in the first direction; the plurality of flexible supporting pieces are arranged on the two sides of each flat plate respectively, and the flexible supporting pieces are foamed nickel or corrugated nickel nets or pure nickel punching plate nets; the plurality of active electrode nets are arranged on the sides, deviating from the corresponding flat plates, of the flexible supporting pieces respectively; and the plurality of pieces of diaphragm cloth are arranged between the two active electrode nets between the two adjacent flat plates. The flexible supporting piece is extruded through the flat plate, so that the active electrode net is tightly attached to the diaphragm cloth, the zero-order spacing of the active electrode net is realized, and the energy consumption of the electrolytic cell is reduced; meanwhile, the flexible supporting piece is of a nickel-based elastic structure, the risk that the diaphragm cloth is broken due to hard supporting is avoided, and due to the deformable and springback characteristics of the nickel-based elastic structure, the fault tolerance rate of the fastening distance of the electrolytic cell is better.

Description

Technical Field

[0001] This application relates to the field of water electrolysis for hydrogen production technology, and in particular to a flexible support electrolyzer. Background Technology

[0002] An alkaline electrolyzer is composed of multiple electrolysis chambers stacked in series. Each chamber consists of stacked electrode plates, a supporting structure, an electrode mesh, and a diaphragm cloth. Electrode meshes are placed on both sides of the diaphragm cloth, and electrode plates are placed on the opposite sides of the two electrode meshes. The two electrode plates are clamped together by the supporting structure to form two adjacent electrolysis chambers.

[0003] Currently, most alkaline water electrolysis hydrogen production electrolyzers use a protruding plate structure for the internal support of the electrolysis chamber. This involves stamping multiple protruding points on the front and back of a flat metal electrode plate using a large stamping die, forming a support surface that clamps the electrode mesh and diaphragm cloth while also serving as a gas flow channel.

[0004] However, in the above scheme, the nipple structure is formed by stamping planar metal plates. During the assembly of the electrolyzer, the ideal state is that the nipples of each adjacent electrolysis chamber press against each other to form the diaphragm and electrode mesh. However, the nipples formed by metal stamping are very hard, and the diaphragm thickness is less than 1 mm. If the compression is too tight, it is easy to break the diaphragm cloth, causing short circuits and accidents. If the compression is loose, the nipples and electrode mesh are not tightly attached, resulting in low electron transfer efficiency during electrolysis, which further leads to high energy consumption for hydrogen production in the electrolyzer.

[0005] In an electrolytic cell with hundreds of chambers, it is almost impossible to make the papillae of each chamber fit together perfectly. Therefore, the industry generally maintains a certain space between the papillae and the electrode mesh, making it impossible to form a zero-level gap. This results in relatively high energy consumption for electrolytic cells with traditional papillae structures.

[0006] Meanwhile, the electrode plates in the electrolytic cell all need to be electroplated with nickel. Because the electrode plates are formed by stamping to create a protruding structure, many bumps and depressions are formed. However, these bumps and depressions are very unfavorable for electroplating, especially since the plating thickness at the bumps is very thin. This has a significant impact on the long-term service life of the electrodes. Bumps and depressions are often weak points in the corrosion of the component electrode plates. Utility Model Content

[0007] The main objective of this application is to provide a flexible support electrolytic cell, which aims to solve the problems of relatively high energy consumption and inconvenience of electroplating caused by the use of electrode plates with protrusions in traditional electrolytic cells.

[0008] To achieve the above objectives, this application provides a flexible support electrolyzer, which includes at least two flat electrode plates, multiple flexible support members, multiple active electrode meshes, and multiple diaphragm cloths. The at least two flat electrode plates are spaced apart in a first direction, which is the same as the thickness direction of the flat electrode plates. The multiple flexible support members are respectively disposed on both sides of each of the flat electrode plates, and the flexible support members are nickel-based elastic structures. The multiple active electrode meshes are respectively disposed on the side of each of the flexible support members opposite to the corresponding flat electrode plate. The multiple diaphragm cloths are respectively disposed between two active electrode meshes between two adjacent flat electrode plates.

[0009] Optionally, the flexible support electrolytic cell further includes an electrode frame and a sealing gasket. The electrode frames are arranged one-to-one on the outer periphery of the flat electrode plate; the sealing gasket is arranged between adjacent electrode frames, and the edge of the diaphragm cloth is clamped to the electrode frame through the sealing gasket.

[0010] Optionally, the flexible support is a foamed nickel mesh, a corrugated nickel mesh, or a pure nickel stamped mesh.

[0011] Optionally, in the first direction, the thickness of the flexible support is a, the distance between the flat electrode plate and the active electrode mesh located on the same side of the diaphragm cloth is b, and a≥b.

[0012] Optionally, the flexible support electrolytic cell further includes multiple protrusions, which are disposed on both sides of the flat electrode plate.

[0013] Optionally, in the first direction, the length by which the protrusion extends beyond the flat electrode plate is c, the distance between the flat electrode plate and the active electrode mesh located on the same side of the diaphragm cloth is b, and c < b.

[0014] Optionally, the protrusion is semi-circular.

[0015] Optionally, the protrusion is a threaded post, and the flexible support is fixed to the flat electrode plate through the protrusion.

[0016] Optionally, the plurality of protrusions located on the same side of the flat electrode plate are arranged in a circular array.

[0017] Optionally, the multiple protrusions located on the same side of the flat electrode plate are arranged in a vertical array.

[0018] This application proposes a flexible-supported electrolytic cell. Within a single unit structure of the electrolytic cell, two flexible support members are tightly attached between two flat electrode plates, and two active electrode meshes are tightly attached between the two flexible support members. A diaphragm cloth is clamped between the two active electrode meshes. By pressing the flexible support members with the flat electrode plates, the active electrode meshes are tightly attached to the diaphragm cloth, achieving zero-level spacing between the active electrode meshes and reducing the energy consumption of the electrolytic cell. Simultaneously, the use of a nickel-based elastic structure avoids the risk of diaphragm cloth rupture caused by rigid supports. The deformable and resilient characteristics of the nickel-based elastic structure improve the tolerance of the electrolytic cell's clamping spacing. Attached Figure Description

[0019] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] Figure 1 This is a schematic diagram of a unit structure of a flexible supported electrolytic cell provided in an embodiment of this application;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure after adding the protrusion in the Chinese embodiment Figure 1 ;

[0023] Figure 3 for Figure 1 Schematic diagram of the structure after adding the protrusion in the Chinese embodiment Figure 2 ;

[0024] Figure 4 This is a schematic diagram of the structure at the flat electrode plate in this application. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the structure at the flat electrode plate in this application. Figure 2 .

[0026] In the diagram: 1. Electrode frame; 2. Flat electrode plate; 3. Flexible support; 4. Active electrode mesh; 5. Diaphragm cloth; 6. Sealing gasket; 7. Protrusion.

[0027] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] In traditional schemes, a small number of alkaline water electrolysis hydrogen production electrolyzers use stamped steel mesh as the supporting structure for the small chambers inside the electrolyzer. That is, instead of stamping the electrode plates, a steel plate is added between the electrode plates and the electrode mesh, and the steel plate is stamped into a perforated screen structure and attached between the electrode plates and the electrode mesh to form a support and a gas flow channel.

[0033] First, the punched plate screen is also made by punching a 1mm to 2mm metal plate into a perforated screen. Compared with the nipple structure, this structure has some improvement in support rigidity, but it is still very hard. In actual application, attention should be paid to the tightness. The electrode screen should not be pressed too tightly, which may cause the diaphragm to break. If the punched plate screen and the electrode screen are kept at a certain distance, a zero-level gap cannot be formed, resulting in relatively high energy consumption of the electrolytic cell.

[0034] Secondly, a bigger problem with perforated metal mesh lies in the low quality of its electroplating and electroless plating. This is mainly because the support points of the perforated metal mesh are formed by the extrusion of metal plates, resulting in many gaps and dead corners. During electroplating and electroless plating, it is difficult to achieve uniform coating coverage, leading to a shorter lifespan compared to perforated structures.

[0035] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a partial structural schematic diagram of a flexible support electrolytic cell provided in an embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the structure after adding the protrusion in the Chinese embodiment Figure 1 ; Figure 3 for Figure 1 Schematic diagram of the structure after adding the protrusion in the Chinese embodiment Figure 2 ; Figure 4 This is a schematic diagram of the structure at the flat electrode plate in this application. Figure 1 ; Figure 5 This is a schematic diagram of the structure at the flat electrode plate in this application. Figure 2 .

[0037] refer to Figures 1-5 This application provides a flexible support electrolytic cell, which may include at least two flat electrode plates 2, multiple flexible support members 3, multiple active electrode meshes 4, and multiple diaphragm cloths 5. The at least two flat electrode plates 2 are spaced apart in a first direction, which is the same as the thickness direction of the flat electrode plates 2. The multiple flexible support members 3 are respectively disposed on both sides of each flat electrode plate 2, and the flexible support members 3 are nickel-based elastic structures. The multiple active electrode meshes 4 are respectively disposed on the side of each flexible support member 3 away from the corresponding flat electrode plate 2. The multiple diaphragm cloths 5 are respectively disposed between the two active electrode meshes 4 between two adjacent flat electrode plates 2.

[0038] This application proposes a flexible support electrolytic cell. Within a single unit structure of the electrolytic cell, two flexible support members 3 are tightly attached between two flat electrode plates 2, and two active electrode meshes 4 are tightly attached between the two flexible support members 3. A diaphragm cloth 5 is clamped between the two active electrode meshes 4. By pressing the flexible support members 3 with the flat electrode plates 2, the active electrode meshes 4 are tightly attached to the diaphragm cloth 5, achieving zero-level spacing of the active electrode meshes 4 and reducing the energy consumption of the electrolytic cell. At the same time, the use of a nickel-based elastic structure avoids the risk of diaphragm cloth 5 breaking due to rigid supports. The deformability and resilience of the nickel-based elastic structure improves the tolerance of the electrolytic cell's clamping spacing.

[0039] It should be noted that the unit structure refers to the components between two adjacent flat electrode plates 2 and between the two flat electrode plates 2, such as... Figure 1 The diagram shows a unit structure; in addition, the electrolytic cell should also have two end plates set on the outer side of multiple flat plates 2 in the first direction, and be tightened and fixed into an electrolytic cell by tie rods, disc springs, nuts, etc.

[0040] In addition, the use of a nickel-based elastic structure, compared with the traditional nipple structure and steel mesh structure, truly achieves the feature that the flat electrode plate 2, flexible support 3, and active electrode mesh 4 are tightly attached together. It also makes the distance between the active electrode mesh 4 on both sides of the diaphragm cloth 5 infinitely close. In this way, the closer the active electrode mesh 4 on both sides are, the lower the resistance during operation and the more energy-efficient the hydrogen production.

[0041] Among them, the flexible support 3 can be foamed nickel, corrugated nickel mesh, or pure nickel stamped mesh. Both foamed nickel and corrugated nickel mesh are made of pure nickel. Compared with the traditional protrusion structure and steel stamped mesh structure carbon steel nickel plating method, it has better corrosion resistance and a longer service life in high temperature, strong alkalinity and high current density environments.

[0042] According to the experiment, using foamed nickel and corrugated nickel mesh, compared with the traditional papillary structure, the cell voltage is reduced by nearly 0.1V, and the energy saving is 0.239KW for producing 1m3 of hydrogen. Based on a 1000m3 electrolyzer operating for 8000 hours a year, the annual energy saving is 1.912 million kilowatts, saving nearly one million yuan in electricity costs.

[0043] It should be noted that the flat electrode plate 2 is usually circular and disc-shaped, so the flexible support 3 is also disc-shaped. The foamed nickel, corrugated nickel mesh, or pure nickel stamped mesh is an open mesh structure, which has the function of hydrogen and oxygen passing through, ensuring that the hydrogen and oxygen generated during the electrolysis process are discharged to the external circulation system of the electrolytic cell through the open mesh structure of the foamed nickel or corrugated nickel mesh; among them, the diaphragm cloth 5 plays the role of separating hydrogen and oxygen.

[0044] refer to Figure 1In an exemplary embodiment, the flexible support electrolytic cell may further include an electrode frame 1 and a sealing gasket 6. The electrode frames 1 are disposed one-to-one on the outer periphery of the flat electrode 2; the sealing gasket 6 is disposed between adjacent electrode frames 1, and the edge of the diaphragm cloth 5 is clamped to the electrode frame 1 by the sealing gasket 6.

[0045] It should be noted that the electrode frame 1 is arranged around the outer periphery of the flat electrode 2. When the flat electrode 2 is circular, the electrode frame 1 is annular, and the corresponding sealing gasket 6 is also annularly arranged between adjacent electrode frames 1.

[0046] The electrode frame 1 and the flat electrode 2 can be connected by welding.

[0047] Specifically, the edge of the diaphragm cloth 5 can be clamped between the sealing gasket 6 and an electrode frame 1; of course, an annular receiving groove can also be provided on the inner circumference of the sealing gasket 6 to accommodate the edge of the diaphragm cloth 5, and the sealing gasket 6 can be further squeezed by the two electrode frames 1 to clamp the diaphragm cloth 5; or two sealing gaskets 6 can be arranged side by side between adjacent electrode frames 1 in the first direction, and the edge of the diaphragm cloth 5 can be clamped between the two sealing gaskets 6.

[0048] In addition, such as Figure 1 As shown, the thickness of the electrode frame 1 in the first direction is greater than the thickness of the flat electrode 2. When adjacent electrode frames 1 are pressed and stacked together by the sealing gasket 6, a space is naturally generated between the two flat electrode plates 2 to accommodate the flexible support 3, the active electrode mesh 4, and the diaphragm cloth 5.

[0049] refer to Figure 1 In an exemplary embodiment, in the first direction, the thickness of the flexible support 3 is a, the distance between the flat electrode plate 2 and the active electrode mesh 4 located on the same side of the diaphragm cloth 5 is b, and a≥b.

[0050] Specifically, such as Figure 1 As shown, the distance between the flat electrode plate 2 on the left side of the diaphragm cloth 5 and the active electrode mesh 4 is denoted as b, and the thickness of the flexible support 3 is denoted as a. When a is greater than b, the flexible support 3 is in a compressed state between the flat electrode plate 2 and the active electrode mesh 4. In this way, the foamed nickel or corrugated nickel mesh has a certain clamping force and elasticity, so that the flexible support 3 can be tightly attached to the flat electrode plate 2 and the active electrode mesh 4, and clamp the diaphragm cloth 5 to achieve zero-level spacing.

[0051] refer to Figure 2 In an exemplary embodiment, the flexible support electrolytic cell may further include a plurality of protrusions 7, which are disposed on both sides of the flat electrode plate 2.

[0052] Specifically, on the stacked flat electrode plates 2, flexible support members 3 are provided on both sides of the flat electrode plates 2, and support portions 7 are also provided on both sides of the flat electrode plates 2, such as... Figure 2 As shown.

[0053] In large-scale electrolytic cell applications, the flexible support 3 is vertically installed (i.e., its thickness direction is horizontal) and has a large diameter. Therefore, the flexible support 3 is prone to deformation or collapse during long-term use. To address this, a protrusion 7 is added to the flat electrode plate 2, partially inserting into one side of the flexible support 3. This improves the stability of the flexible support 3, preventing collapse or deformation, and ensuring long-term full coverage and tight contact between the flexible support 3, the flat electrode plate 2, and the active electrode mesh 4.

[0054] It should be noted that the protrusion 7 can be formed by stamping directly from the flat electrode plate 2, or the protrusion 7 can be directly welded onto the flat electrode plate 2 as a separate component, which makes electroplating the flat electrode plate 2 more convenient.

[0055] refer to Figure 2 In an exemplary embodiment, in the first direction, the length of the protrusion 7 extending out of the flat electrode plate 2 is c, the distance between the flat electrode plate 2 located on the same side of the diaphragm cloth 5 and the active electrode mesh 4 is b, and c < b.

[0056] Specifically, when c is less than b, the protrusion 7 cannot completely pass through the flexible support 3, thus ensuring that the rigid protrusion 7 will not come into contact with the active electrode mesh 4 and cause rigid support, further preventing the diaphragm cloth 5 from being damaged.

[0057] It should be understood that the ratio of c to b is denoted as d, where 0 < d < 1. Specifically, d can be 0.2, 0.4, 0.6, 0.8, etc. The larger the value of d, the deeper the protrusion 7 is inserted into the flexible support 3, thus providing better support for the flexible support 3. However, the rebound effect of the flexible support 3 located in the area between the protrusion 7 and the active electrode mesh 4 is worse. The smaller the value of d, the shallower the protrusion 7 is inserted into the flexible support 3, thus providing worse support for the flexible support 3. However, the rebound effect of the flexible support 3 located in the area between the protrusion 7 and the active electrode mesh 4 is better. The specific value of d can be selected according to the size of the flexible support 3. For example, if the flexible support 3 is large, the value of d should also be large; if the flexible support 3 is small, the value of d should also be small.

[0058] In a preferred embodiment, the value of d is 0.5, so the depth of the protrusion 7 inserted into the flexible support 3 is more reasonable, the support effect of the protrusion 7 on the flexible support 3 is better, and the rebound effect of the flexible support 3 located in the middle area between the protrusion 7 and the active electrode mesh 4 is also better.

[0059] refer to Figure 2In the exemplary embodiment, the protrusion 7 is semi-circular. Thus, the protrusion 7 provides support for the flexible support 3, preventing deformation or collapse of the flexible support 3 in a large electrolytic cell. The semi-circular shape of the protrusion 7 ensures that the portion of the protrusion 7 inserted into the flexible support 3 is relatively smooth with almost no sharp edges, minimizing damage to the flexible support 3 while providing support.

[0060] Of course, the shape of the protrusion 7 can also be square, cylindrical, etc. It is worth mentioning that the more edges and corners the protrusion has, the greater the damage to the flexible support 3. The specific shape of the protrusion 7 can be adjusted according to the size of the flexible support 3. For example, if the flexible support 3 is large, the protrusion 7 can be cylindrical, square, etc., so that the support effect of the flexible support 3 is better.

[0061] refer to Figure 3 In the exemplary embodiment, the protrusion 7 is a threaded post, and the flexible support 3 is fixed to the flat electrode plate 2 through the protrusion 7. This direct fastening of the flexible support 3 to the flat electrode plate 2 via the threaded post provides better support for the flexible support 3.

[0062] refer to Figure 4 In an exemplary embodiment, a plurality of protrusions 7 located on the same side of the flat electrode plate 2 are arranged in a circular array.

[0063] Specifically, taking the multiple protrusions 7 on one side of the flat electrode plate 2 as an example, such as... Figure 4 As shown, if the multiple protrusions 7 are distributed in a circular array, the distribution of each protrusion 7 relative to the disc-shaped flexible support 3 is more uniform, and the support effect on the flexible support 3 is better, preventing the flexible support 3 from deforming or collapsing in a large electrolytic cell.

[0064] refer to Figure 5 In an exemplary embodiment, a plurality of protrusions 7 located on the same side of the flat electrode plate 2 are arranged in a vertical array.

[0065] Specifically, vertical here can be understood as the direction of gravity. That is, some of the protrusions 7 are arranged at intervals in the direction of gravity to form a row of protrusions. Multiple rows of protrusions are arranged at intervals in the horizontal direction. In this way, multiple protrusions 7 support the flexible support 3, and channels are formed between adjacent protrusions to ensure that hydrogen and oxygen can float smoothly.

[0066] It should be understood that the multiple protrusions 7 located on the same side of the flat electrode plate 2 are arranged in a vertical array to ensure that the multiple rows of protrusions are spaced apart in the horizontal direction, and that a channel is formed between adjacent protrusions. The number of protrusions 7 in each row of protrusions may not be the same.

[0067] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A flexible supported electrolytic cell characterized by, The application relates to a flexible support electrolytic cell, comprising: at least two flat polar plates (2) arranged at intervals in a first direction, wherein the first direction is the same as the thickness direction of the flat polar plates (2); a plurality of flexible support members (3) arranged on both sides of each flat polar plate (2), wherein the flexible support members (3) are nickel-based elastic structures; a plurality of active electrode nets (4) arranged on the side of each flexible support member (3) away from the corresponding flat polar plate (2); a plurality of diaphragm cloths (5) arranged between two active electrode nets (4) between two adjacent flat polar plates (2).

2. The flexible supported electrolytic cell of claim 1, wherein, The flexible support electrolytic cell further comprises: a polar plate frame (1) arranged on the outer periphery of each flat polar plate (2) one by one; a sealing gasket (6) arranged between adjacent polar plate frames (1), and the edges of the diaphragm cloths (5) are clamped by the sealing gaskets (6) and the polar plate frames (1).

3. The flexible supported electrolytic cell of claim 2, wherein, The flexible support member (3) is a foamed nickel or corrugated nickel net or a pure nickel punched plate net.

4. The flexible supported electrolytic cell of claim 1, wherein, In the first direction, the thickness of the flexible support member (3) is a, the distance between the flat polar plate (2) and the active electrode net (4) on the same side of the diaphragm cloth (5) is b, and a >= b.

5. The flexible supported electrolytic cell of claim 1, wherein, The flexible support electrolytic cell further comprises: a plurality of protruding portions (7) arranged on both sides of the flat polar plate (2).

6. The flexible supported electrolytic cell of claim 5, wherein, In the first direction, the length of the protruding portion (7) protruding from the flat polar plate (2) is c, the distance between the flat polar plate (2) and the active electrode net (4) on the same side of the diaphragm cloth (5) is b, and c < b.

7. The flexible supported electrolytic cell of claim 5, wherein, The protruding portion (7) protrudes in a semicircular shape.

8. The flexible supported electrolytic cell of claim 5, wherein, The protruding portion (7) is a threaded column, and the flexible support member (3) is fixed with the flat polar plate (2) through the protruding portion (7).

9. The flexible supported electrolytic cell of claim 5, wherein, The plurality of protruding portions (7) on the same side of the flat polar plate (2) are arranged in a circular array.

10. The flexible supported electrolytic cell of claim 5, wherein, The plurality of protruding portions (7) on the same side of the flat polar plate (2) are arranged in a vertical array.

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