Electrolytic bath

Abstract

The utility model relates to the technical field of electrolysis equipment, and provides an electrolytic bath. The electrolytic bath comprises an electrolytic bath body and a flow field, and the flow field is arranged on the electrolytic bath body and used for conveying alkali liquor. The flow field comprises a middle liquid inlet structure, an inlet of the middle liquid inlet structure communicates with a liquid inlet pipeline, and an outlet of the middle liquid inlet structure communicates with a liquid return pipeline; wherein the liquid inlet pipeline extends from the first end of the electrolytic bath body to an inlet of the middle liquid inlet structure, and the middle liquid inlet structure extends from the first end of the electrolytic bath body to an outlet of the middle liquid inlet structure. According to the electrolytic bath, the defects that in the prior art, an alkali liquor flowing path of a backflow liquid inlet structure is long and the uniformity is poor, and a pipeline connected with a middle polar plate in a middle liquid inlet structure is difficult to electroplate and easy to corrode are overcome, the uniformity of a flow field can be improved, and the pipeline connected with the middle polar plate can be prevented from being easily corroded.

Description

Technical Field

[0001] This utility model relates to the field of electrolysis equipment technology, and in particular to an electrolytic cell. Background Technology

[0002] An alkaline electrolyzer is a device used to produce hydrogen and oxygen by electrolyzing water, typically employing alkaline electrolytes to improve electrolysis efficiency. Existing large-scale alkaline electrolyzers mainly employ either a reflux-feed or intermediate-feed structure. In the reflux-feed structure, the alkaline solution flows through a long path, resulting in poor flow field uniformity. In the intermediate-feed structure, the central electrode plate requires welded pipes, which are difficult to electroplate at the weld joints and are susceptible to corrosion. Utility Model Content

[0003] This invention provides an electrolytic cell to solve the defects of existing technologies, such as long alkali flow paths and poor uniformity in reflux-feed structures, and difficulties in electroplating and easy corrosion of pipes connected to the central electrode plate in intermediate-feed structures. The invention achieves an electrolytic cell that can improve flow field uniformity and avoid easy corrosion of pipes connected to the central electrode plate.

[0004] This utility model provides an electrolytic cell, comprising:

[0005] Electrolytic cell body;

[0006] A flow field, located on the electrolytic cell body, is used for conveying alkaline solution; the flow field includes an intermediate liquid inlet structure, the inlet of which is connected to an inlet pipe, and the outlet of which is connected to a return pipe.

[0007] The liquid inlet pipe extends from the first end of the electrolytic cell body to the inlet of the intermediate liquid inlet structure, and the intermediate liquid inlet structure extends from the first end of the electrolytic cell body to the outlet of the intermediate liquid inlet structure.

[0008] According to the present invention, an electrolytic cell is provided, the electrolytic cell body includes a central electrode plate, and end electrode plates are provided on both sides of the central electrode plate. A plurality of bipolar plates are also provided between the central electrode plate and the end electrode plates. The central electrode plate, the end electrode plates and the bipolar plates are pressed together to form a whole.

[0009] According to the electrolytic cell provided by this utility model, each of the two end plates is provided with a pressure plate on the side away from the bipolar plate, and a locking component is provided between the two pressure plates. The locking component is used to adjust the distance between the two pressure plates so as to squeeze the middle plate, the end plates and the bipolar plate together to form a whole.

[0010] According to the electrolytic cell provided by this utility model, one end of the liquid inlet pipe is located at either of the two pressure plates;

[0011] The other end of the liquid inlet pipe passes through the end electrode plate and the bipolar plate in sequence, and extends into the middle electrode plate, connecting with one end of the liquid inlet pipe of the middle electrode plate inside the middle electrode plate.

[0012] The other end of the liquid inlet pipe of the intermediate electrode plate is connected to the liquid inlet of the intermediate liquid inlet structure.

[0013] According to the present invention, one end of the return liquid pipeline is disposed on the pressure plate provided with the inlet liquid pipeline, and the return liquid pipeline and the inlet liquid pipeline are arranged at intervals.

[0014] The other end of the return pipe passes through the end plate and the bipolar plate in sequence, and extends into the middle plate, communicating with one end of the middle plate outlet pipe inside the middle plate. The middle plate outlet pipe and the middle plate inlet pipe are arranged alternately.

[0015] The other end of the liquid outlet pipe of the intermediate electrode plate is connected to the liquid outlet of the intermediate liquid inlet structure.

[0016] According to the electrolytic cell provided by this utility model, the intermediate liquid inlet structure includes:

[0017] The return pipeline has two ends connected to two end plates respectively, and the middle part of the return pipeline passes through the middle plate and is connected to the liquid inlet pipeline of the middle plate.

[0018] At least two shunt pipes are symmetrically arranged on both sides of the central electrode plate. The two shunt pipes pass through the bipolar plates on both sides of the central electrode plate and are connected to the two return pipes in a one-to-one correspondence.

[0019] The small chamber channel is located between two adjacent bipolar plates, and one end of each small chamber channel is connected to the corresponding diversion pipeline;

[0020] A manifold is located at the other end of the small chamber channel and is connected to each of the small chamber channels. The manifold passes through the middle electrode plate and is connected to the liquid outlet pipe of the middle electrode plate.

[0021] According to the present invention, an electrolytic cell is provided, wherein multiple locking components are provided, and the multiple locking components are arranged at intervals.

[0022] According to the present invention, an electrolytic cell is provided, wherein the locking component includes a threaded rod that passes through two pressure plates in sequence, and the threaded rod is provided with at least two threaded fasteners, which are located on the outer sides of the two pressure plates in a one-to-one correspondence.

[0023] According to the present invention, an electrolytic cell is provided between two adjacent bipolar plates, a first sealing element is provided between the end plate and the bipolar plate, and a third sealing element is provided between the middle plate and the bipolar plate.

[0024] According to the present invention, an electrolytic cell is provided in which the middle electrode plate, the end electrode plate, the bipolar plate and the pressure plate are coaxially arranged.

[0025] The electrolytic cell provided by this invention incorporates a central liquid inlet system. This system allows the alkali solution to enter the electrolytic cell directly from the center, rather than flowing a long distance from one end to the other. This layout reduces the flow path of the alkali solution, enabling it to be more evenly distributed throughout the electrolytic cells, thereby improving the uniformity of the overall flow field. A uniform flow field contributes to the uniform occurrence of chemical reactions during electrolysis, thus improving electrolysis efficiency and product quality.

[0026] Furthermore, this invention integrates the inlet and return pipelines onto the electrolytic cell body, avoiding the complex process of directly welding pipelines to the intermediate electrode plate in traditional intermediate inlet systems. This not only solves the problem of difficult electroplating at the weld joint but also effectively prevents corrosion of the welded pipelines due to prolonged contact with the electrolyte. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the electrolytic cell body provided by this utility model.

[0029] Figure 2 This is a schematic diagram of the flow field structure of the electrolytic cell provided by this utility model.

[0030] Figure label:

[0031] 100: Electrolytic cell body; 110: Middle electrode plate; 120: End electrode plate; 130: Bipolar plate; 140: Pressure plate;

[0032] 200: Flow field; 210: Liquid inlet pipe; 220: Intermediate liquid inlet structure; 221: Intermediate electrode plate liquid inlet pipe; 222: Return pipe; 223: Divert pipe; 224: Small chamber channel; 225: Manifold pipe; 226: Intermediate electrode plate liquid outlet pipe; 230: Return pipe. Detailed Implementation

[0033] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0034] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0036] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The following is combined with Figure 1 and Figure 2 The following describes various embodiments of the present invention. Specifically, the electrolytic cell in the embodiments can be an alkaline electrolytic cell.

[0039] Reference Figure 1 and Figure 2 The present invention provides an electrolytic cell including an electrolytic cell body 100 and a flow field 200. The flow field 200 is disposed in the electrolytic cell body 100 and includes an intermediate liquid inlet structure 220. The inlet of the intermediate liquid inlet structure 220 is connected to an inlet pipe 210, and the outlet of the intermediate liquid inlet structure 220 is connected to a return liquid pipe 230. The inlet pipe 210 extends from the first end of the electrolytic cell body 100 to the inlet of the intermediate liquid inlet structure 220, and the intermediate liquid inlet structure 220 extends from the first end of the electrolytic cell body 100 to the outlet of the intermediate liquid inlet structure 220.

[0040] It should be noted that the flow field 200 is located inside the electrolytic cell body 100, and can be configured by drilling holes. Specifically, when the flow field 200 passes through some cavities, a channel can be welded between the cavity and the hole to ensure the directional flow of the alkali solution. The inlet pipe 210 and the return pipe 230 are arranged parallel to each other and located at different positions in the electrolytic cell body 100, but the inlet pipe 210 and the return pipe 230 are not directly connected. The inlet pipe 210 and the return pipe 230 can both be located on the left side of the central electrode plate 110, or both can be located on the right side of the electrolytic cell body 100.

[0041] The flow field 200 of this invention includes an intermediate liquid inlet system. This intermediate liquid inlet system allows the alkali solution to enter the electrolytic cell directly from the middle position, instead of flowing a long distance from one end to the other. This layout reduces the flow path of the alkali solution, allowing it to be more evenly distributed in each electrolysis chamber of the electrolytic cell, thereby improving the uniformity of the overall flow field 200 of the electrolytic cell. A uniform flow field 200 helps the chemical reaction to occur uniformly during electrolysis, thus improving electrolysis efficiency and product quality. In addition, this invention integrates the liquid inlet pipe 210 and the liquid return pipe 230 onto the electrolytic cell body 100, avoiding the complex process of directly welding pipes to the intermediate electrode plate in traditional intermediate liquid inlet systems. This not only solves the problem of difficult electroplating at the weld joint, but also effectively prevents corrosion of the welded pipes due to prolonged contact with the electrolyte.

[0042] Reference Figure 1 In some embodiments of this utility model, the electrolytic cell body 100 includes a central electrode plate 110, and end electrode plates 120 are provided on both sides of the central electrode plate 110. A plurality of bipolar plates 130 are also provided between the central electrode plate 110 and the end electrode plates 120. The central electrode plate 110, the end electrode plates 120 and the bipolar plates 130 are pressed together to form a whole.

[0043] In this embodiment, opposite electrodes are provided on both sides of the bipolar plate 130, meaning that one side of each bipolar plate 130 serves as the cathode and the other side as the anode. When multiple bipolar plates 130 are arranged in a specific order and pressed together by the middle electrode 110 and the end electrode 120, multiple independent electrolytic chambers are formed between them. Within each electrolytic chamber, due to the presence of opposite electrodes on both sides of the bipolar plate 130, an electrolytic reaction can occur independently.

[0044] This design not only ensures uniform current distribution within the electrolyzer, improving current efficiency, but also effectively controls reaction conditions such as temperature and pressure within each individual electrolyzer compartment by dividing the electrolysis process into multiple compartments, thereby optimizing the entire electrolysis process. Furthermore, the multi-compartment design helps improve the electrolyzer's production capacity and flexibility, allowing the number of compartments to be adjusted according to actual needs to adapt to different scales of production requirements.

[0045] Reference Figure 1In some embodiments of this utility model, each of the two end plates 120 is provided with a pressure plate 140 on the side opposite to the bipolar plate 130. A locking component is provided between the two pressure plates 140 to adjust the distance between the two pressure plates 140, so as to press the middle plate 110, the end plates 120 and the bipolar plate 130 together to form a whole. Specifically, the two pressure plates 140 are located on the outermost side. By pressing the two pressure plates 140, the middle plate 110, the end plates 120 and the bipolar plate 130 are pressed together to form a complete electrolytic cell. It should be noted that the middle plate 110, the end plates 120, the bipolar plate 130 and the pressure plate 140 are coaxially arranged, and the area of ​​the pressure plate 140 is larger than the area of ​​the middle plate 110, the end plates 120 and the bipolar plate 130. This arrangement allows for better pressing.

[0046] In some possible embodiments, the locking component includes a hydraulic cylinder, a hydraulic control system, an adjustment mechanism, and a guide rod. Specifically, the hydraulic cylinder is positioned between two pressure plates 140. Specifically, the piston rod of the hydraulic cylinder is connected to one of the pressure plates 140, and the cylinder body is fixed to the other pressure plate 140. The guide rod passes through both pressure plates 140, thereby allowing the two pressure plates 140 to move along the guide rod. The hydraulic control system is used to control the extension and retraction of the hydraulic cylinder; it can be integrated into a control panel for easy operation and monitoring. The adjustment mechanism can be a manual or electric adjustment valve. When the adjustment mechanism is a manual adjustment valve, the operator can manually control the extension and retraction of the hydraulic cylinder to adjust the distance between the two pressure plates 140. When the adjustment mechanism is an electric adjustment valve, the electric adjustment valve can be integrated with the control system to achieve remote control and monitoring, directly achieving automatic adjustment of the distance between the pressure plates 140 through electric control.

[0047] Reference Figure 1 and Figure 2 In some embodiments of this utility model, one end of the liquid inlet pipe 210 is located at either of the two pressure plates 140; the other end of the liquid inlet pipe 210 passes through the end electrode plate 120 and the bipolar plate 130 in sequence, and extends into the middle electrode plate 110, communicating with one end of the intermediate electrode plate liquid inlet pipe 221 inside the middle electrode plate 110; the other end of the intermediate electrode plate liquid inlet pipe 221 is communicated with the liquid inlet of the intermediate liquid inlet structure 220.

[0048] Specifically, refer to Figure 1 One end of the liquid inlet pipe 210 is located on the left pressure plate 140, and the liquid inlet pipe 210 extends horizontally to the right from the left pressure plate 140, passing through the left end electrode plate 120 and multiple left bipolar plates 130 in sequence, and finally extending into the middle electrode plate 110. The intermediate electrode plate liquid inlet pipe 221 inside the middle electrode plate 110 is arranged along the radial direction of the middle electrode plate 110 and is connected to the liquid inlet of the intermediate liquid inlet structure 220.

[0049] In existing technology, pipes are directly welded onto the central electrode plate 110. Because the electrodes on both sides of the central electrode plate 110 are different, hydroxide ions are generated on the cathode side, making the solution alkaline; hydrogen ions are generated on the anode side, making the solution acidic. This pH difference causes different corrosive effects on the welded pipe. Both alkaline and acidic environments accelerate metal corrosion, especially at the welded area, because the microstructure and chemical composition of the heat-affected zone may differ from the substrate, making it more susceptible to corrosion. This embodiment, however, directly uses a perforation method to allow one side of the central electrode plate 110 to penetrate its interior, avoiding the corrosion defects caused by welding.

[0050] Reference Figure 1 and Figure 2 In some embodiments of this utility model, one end of the return liquid pipe 230 is disposed on the pressure plate 140 which has the inlet liquid pipe 210, and the return liquid pipe 230 and the inlet liquid pipe 210 are spaced apart; the other end of the return liquid pipe 230 passes through the end electrode plate 120 and the bipolar plate 130 in sequence, and extends into the middle electrode plate 110, communicating with one end of the intermediate electrode plate outlet pipe 226 inside the middle electrode plate 110, and the intermediate electrode plate outlet pipe 226 and the intermediate electrode plate inlet pipe 221 are spaced apart; the other end of the intermediate electrode plate outlet pipe 226 is connected to the outlet of the intermediate inlet structure 220. The arrangement of the return liquid pipe 230 in this embodiment is similar to that of the inlet liquid pipe 210, so the discussion in the previous embodiment can be referred to, and will not be repeated here.

[0051] Reference Figure 1 and Figure 2 In some embodiments of this utility model, the intermediate liquid inlet structure 220 includes a return pipe 222, at least two branch pipes 223, a small chamber channel 224, and a manifold 225. The two ends of the return pipe 222 are respectively connected to two end plates 120, and the middle part of the return pipe 222 passes through the middle plate 110 and is connected to the intermediate plate liquid inlet pipe 221. The two branch pipes 223 are symmetrically arranged on both sides of the middle plate 110, and the two branch pipes 223 are respectively... Bipolar plates 130 pass through both sides of the central electrode plate 110 and are connected to two return lines 222 in a corresponding manner; small chamber channels 224 are located between two adjacent bipolar plates 130, and one end of each small chamber channel 224 is connected to the corresponding branch line 223; a manifold 225 is located at the other end of the small chamber channel 224 and is connected to each small chamber channel 224. The manifold 225 passes through the central electrode plate 110 and is connected to the liquid outlet line 226 of the middle electrode plate.

[0052] Specifically, when the alkali solution flows in from the inlet end of the inlet pipe 210, it is guided directly to the intermediate electrode plate inlet pipe 221 inside the middle electrode plate 110. Then, it undergoes initial diversion from the intermediate electrode plate inlet pipe 221, causing the alkali solution to flow to both ends of the return pipe 222, and then to the end electrode plates 120 at both ends. After reaching the end electrode plates 120 at both ends, it flows from the end electrode plates 120 towards the middle electrode plate 110, entering each small chamber channel 224 for secondary diversion. Finally, all the alkali solution flows from each small chamber channel 224 to the manifold pipe 225 for convergence, and finally converges to the intermediate electrode plate outlet pipe 226 inside the middle electrode plate 110. It then flows through the intermediate electrode plate outlet pipe 226 to the return pipe 230, and finally flows out through the return pipe 230.

[0053] In some embodiments of this utility model, multiple locking components are provided, spaced apart. By providing multiple locking components, the force between the two pressure plates 140 can be made more uniform. Each locking component includes a threaded rod that passes sequentially through the two pressure plates 140. Each threaded rod has at least two threaded fasteners, each corresponding to one of the outer sides of the two pressure plates 140. When the electrolytic cell body 100 needs to be press-fitted, the multiple threaded rods are first sequentially passed through the two pressure plates 140. Then, the two threaded fasteners are threadedly connected to the threaded rods from the outer sides of the two pressure plates 140, causing the two threaded fasteners to continuously press against the two pressure plates 140 until they are fixed. Specifically, the threaded fasteners can be nuts.

[0054] In some embodiments of this invention, a first sealing element is provided between two adjacent bipolar plates 130; a second sealing element is provided between the end plate 120 and the bipolar plate 130; and a third sealing element is provided between the middle plate 110 and the bipolar plate 130. The leakage of alkali solution can be prevented by providing the first, second, and third sealing elements.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electrolytic cell, characterized in that, include: Electrolytic cell body; A flow field is provided in the body of the electrolytic cell for conveying alkaline solution; The flow field includes an intermediate liquid inlet structure, the inlet of which is connected to an inlet pipe, and the outlet of which is connected to a return pipe. The liquid inlet pipe extends from the first end of the electrolytic cell body to the inlet of the intermediate liquid inlet structure, and the intermediate liquid inlet structure extends from the first end of the electrolytic cell body to the outlet of the intermediate liquid inlet structure.

2. The electrolytic cell according to claim 1, characterized in that, The electrolytic cell body includes a central electrode plate, and end electrode plates are provided on both sides of the central electrode plate. Multiple bipolar plates are also provided between the central electrode plate and the end electrode plates. The central electrode plate, the end electrode plates and the bipolar plates are pressed together to form a whole.

3. The electrolytic cell according to claim 2, characterized in that, Each of the two end plates has a pressure plate on the side opposite to the bipolar plate, and a locking component is provided between the two pressure plates. The locking component is used to adjust the distance between the two pressure plates so as to press the middle plate, the end plates and the bipolar plate together to form a whole.

4. The electrolytic cell according to claim 3, characterized in that, One end of the liquid inlet pipe is located at either of the two pressure plates; The other end of the liquid inlet pipe passes through the end electrode plate and the bipolar plate in sequence, and extends into the middle electrode plate, connecting with one end of the liquid inlet pipe of the middle electrode plate inside the middle electrode plate. The other end of the liquid inlet pipe of the intermediate electrode plate is connected to the liquid inlet of the intermediate liquid inlet structure.

5. The electrolytic cell according to claim 4, characterized in that, One end of the return liquid pipeline is provided on the pressure plate provided with the inlet liquid pipeline, and the return liquid pipeline and the inlet liquid pipeline are arranged at a distance; The other end of the return pipe passes through the end plate and the bipolar plate in sequence, and extends into the middle plate, communicating with one end of the middle plate outlet pipe inside the middle plate. The middle plate outlet pipe and the middle plate inlet pipe are arranged alternately. The other end of the liquid outlet pipe of the intermediate electrode plate is connected to the liquid outlet of the intermediate liquid inlet structure.

6. The electrolytic cell according to claim 5, characterized in that, The intermediate liquid inlet structure includes: The return pipeline has two ends connected to two end plates respectively, and the middle part of the return pipeline passes through the middle plate and is connected to the liquid inlet pipeline of the middle plate. At least two shunt pipes are symmetrically arranged on both sides of the central electrode plate. The two shunt pipes pass through the bipolar plates on both sides of the central electrode plate and are connected to the two return pipes in a one-to-one correspondence. The small chamber channel is located between two adjacent bipolar plates, and one end of each small chamber channel is connected to the corresponding diversion pipeline; A manifold is located at the other end of the small chamber channel and is connected to each of the small chamber channels. The manifold passes through the middle electrode plate and is connected to the liquid outlet pipe of the middle electrode plate.

7. The electrolytic cell according to any one of claims 3-6, characterized in that, The locking components are provided in multiple ways, and the multiple locking components are arranged at intervals.

8. The electrolytic cell according to claim 7, characterized in that, The locking component includes a threaded rod that passes through the two pressure plates in sequence. The threaded rod is provided with at least two threaded fasteners, which are located on the outer sides of the two pressure plates in a one-to-one correspondence.

9. The electrolytic cell according to any one of claims 2-6, characterized in that, A first sealing element is provided between two adjacent bipolar plates; a second sealing element is provided between the end plate and the bipolar plate; and a third sealing element is provided between the middle plate and the bipolar plate.

10. The electrolytic cell according to any one of claims 3-6, characterized in that, The middle electrode plate, the end electrode plate, the bipolar plate, and the pressure plate are arranged coaxially.

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