Polar plate and electrolytic bath

Abstract

The polar plate comprises a plate main body and a flow field structure, the plate main body is provided with a first surface and a second surface which are oppositely arranged, a peripheral surface is connected between the first surface and the second surface, and the plate main body is provided with a first gas-liquid circulation channel and a second gas-liquid circulation channel; the first gas-liquid circulation channel and the second gas-liquid circulation channel are located between the first surface and the second surface and penetrate through the peripheral surface, the flow field structure is arranged on the first surface, the first surface faces the membrane electrode, the flow field structure comprises a first flow channel, the first flow channel is provided with a first inlet and a first outlet, the first inlet is communicated with the first gas-liquid circulation channel, and the second inlet is communicated with the second gas-liquid circulation channel; and the first outlet is communicated with the second gas-liquid flowing channel. Therefore, while the reliability of the electrolytic bath is ensured, the weight and the size of the electrolytic bath are reduced, and the cost is reduced. The device is widely applied to the technical field of water electrolysis hydrogen production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production by water electrolysis, and in particular to an electrode plate and an electrolytic cell. BACKGROUND

[0002] The commonly used hydrogen production by water electrolysis technology includes four kinds of alkaline water electrolysis, proton exchange membrane electrolysis, high-temperature solid oxide electrolysis and solid polymer anion exchange membrane (AEM) electrolysis. Among them, the AEM water electrolysis technology combines the advantages of alkaline water electrolysis and proton exchange membrane electrolysis, has faster response speed and higher current density, and makes the hydrogen production efficiency higher.

[0003] The existing AEM electrolytic cell usually introduces electrolyte from the end plate, at this time the electrolyte must pass through multiple components to enter the electrolysis chamber. Due to the setting of the multiple components, the leakage surface of the electrolyte is increased, and multiple sets of sealing members need to be set for sealing, which leads to an increase in the number of components of the electrolytic cell. This not only increases the weight and volume of the electrolytic cell, but also increases the manufacturing cost of the electrolytic cell. Moreover, since the electrolyte has a certain corrosiveness, the components through which the electrolyte passes will be damaged to some extent, for example, the end plate is prone to passivation under the influence of electrolyte corrosion, affecting the service life of the end plate, and leading to the increase of the cost of the electrolytic cell. CONTENT OF THE INVENTION

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an electrode plate and an electrolytic cell, which can reduce the weight and volume of the electrolytic cell while ensuring the reliability of the electrolytic cell, and reduce the cost.

[0005] The electrode plate according to the first aspect of the present application is applied to an electrolytic cell, and the electrode plate comprises:

[0006] a plate body, the plate body having a first surface and a second surface arranged oppositely, and an outer peripheral surface connected between the first surface and the second surface, the plate body being provided with a first gas-liquid flow passage and a second gas-liquid flow passage, the first gas-liquid flow passage and the second gas-liquid flow passage being located between the first surface and the second surface and penetrating through the outer peripheral surface;

[0007] a flow field structure, the flow field structure being arranged on the first surface, the flow field structure comprising a first flow channel, the first flow channel being provided with a first inlet and a first outlet, the first inlet being communicated with the first gas-liquid flow passage, and the first outlet being communicated with the second gas-liquid flow passage.

[0008] The electrode plate according to the embodiments of this application has at least the following beneficial effects: By setting a first gas-liquid flow channel and a second gas-liquid flow channel between the first surface and the second surface and penetrating the outer peripheral surface, and making the flow field structure set on the first surface, the first inlet of the first flow channel is connected to the first gas-liquid flow channel, and the first outlet is connected to the second gas-liquid flow channel, so that the electrolyte enters the flow field from the side of the electrode plate to participate in the electrolysis reaction, and flows out from the side of the electrode plate after the electrolysis reaction is completed. In this way, the flow path of the electrolyte is restricted within the electrode plate, which can not only effectively reduce the leakage surface of the electrolyte when it is introduced into the electrolytic cell, reduce the leakage risk, and ensure the reliability of the electrolytic cell, but also reduce the risk of electrolyte corrosion to components, ensure the service life of components, and reduce costs. In addition, controlling the flow path of the electrolyte within the electrode plate can also reduce the number of seals, which can help simplify the structure of the electrolytic cell, facilitate assembly, and reduce the manufacturing cost of the electrolytic cell.

[0009] According to some embodiments of this application, the outer peripheral surface includes a first side surface and a second side surface opposite to each other, the first gas-liquid flow channel passing through the first side surface and the first gas-liquid flow channel passing through the second side surface.

[0010] According to some embodiments of this application, the outer peripheral surface further includes an opposing upper surface and a lower surface, one end of the upper surface is connected to a first side surface, and the other end of the upper surface is connected to a second side surface. The electrode plate further includes an electrode tab, which is connected to the upper surface.

[0011] According to some embodiments of this application, the first flow channel is arranged to bend back and forth along a first direction, and the first inlet and the first outlet are respectively arranged at both ends of the first flow channel and located at both ends of the diagonal of the flow field structure.

[0012] According to some embodiments of this application, the flow field structure further includes ribs that extend along the extension direction of the first flow channel and are located within the first flow channel, so that the first flow channel is divided into two sub-flow channels.

[0013] An electrolytic cell according to a second aspect of this application includes an anode plate, an anode sealing gasket, an anode diffusion layer, a membrane electrode, a cathode diffusion layer, a cathode sealing gasket, a cathode plate, and a cathode plate arranged in sequence, wherein the anode plate and the cathode plate are plates as described in the first aspect above, and the first surface is disposed facing the membrane electrode.

[0014] The electrolytic cell according to the embodiments of this application has at least the following beneficial effects: it can reduce the weight and volume of the electrolytic cell and reduce costs while ensuring the reliability of the electrolytic cell.

[0015] According to some embodiments of this application, the anode plate and the cathode plate are made of insulating materials.

[0016] According to some embodiments of this application, the anode sealing gasket is provided with a first mounting hole through the first surface to the second surface, and the cathode sealing gasket is provided with a second mounting hole through the first surface to the second surface. The first mounting hole and the second mounting hole correspond to the flow field structure. The anode diffusion layer is embedded in the first mounting hole, and the cathode diffusion layer is embedded in the second mounting hole.

[0017] According to some embodiments of this application, the second gas-liquid flow channel of the anode plate and the second gas-liquid flow channel of the cathode plate are located on different sides of the electrolytic cell.

[0018] According to some embodiments of this application, the anode plate, the cathode plate, the anode sealing gasket, the membrane electrode, the cathode sealing gasket, the cathode plate, and the cathode plate are each provided with a connecting hole extending from the first surface to the second surface. Threaded connectors are sequentially inserted into each of the connecting holes, with one end of the threaded connector abutting against the anode plate, and the end of the threaded connector away from the anode plate being threadedly connected to a threaded fastener.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a three-dimensional schematic diagram of the electrolytic cell disclosed in the embodiments of this application;

[0022] Figure 2 This is a right view of the electrolytic cell disclosed in an embodiment of this application;

[0023] Figure 3 This is a cross-sectional view of the electrolytic cell disclosed in an embodiment of this application;

[0024] Figure 4 This is a disassembly diagram of the electrolytic cell disclosed in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the electrode plate disclosed in the embodiments of this application;

[0026] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0027] Figure 7 This is a perspective view of the electrode plate disclosed in the embodiments of this application;

[0028] Figure 8 This is a front view of the electrode plate disclosed in the embodiments of this application;

[0029] Figure 9 This is a cross-sectional view of the electrode plate disclosed in an embodiment of this application.

[0030] Figure label:

[0031] 1. Electrode plate; 11. Plate body; 111. First surface; 112. Second surface; 113. First side surface; 114. Second side surface; 115. Upper surface; 116. Lower surface; 12. Flow field structure; 121. First flow channel; 121a. First inlet; 121b. First outlet; 122. Rib; 13. First gas-liquid flow channel; 14. Second gas-liquid flow channel; 15. Electrode tab;

[0032] 2. Electrolytic cell; 21. Anode end plate; 22. Anode plate; 23. Anode sealing gasket; 231. First mounting hole; 24. Anode diffusion layer; 25. Membrane electrode; 26. Cathode diffusion layer; 27. Cathode sealing gasket; 271. Second mounting hole; 28. Cathode plate; 29. ​​Cathode end plate; 20. Connection hole. Detailed Implementation

[0033] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0034] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0035] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In the description of this application, the use of terms such as "as one implementation," "an embodiment," "some examples," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] AEM (polymeric anion exchange membrane) is a commonly used method in water electrolysis for hydrogen production. Existing AEM electrolyzers typically have an electrolyte inlet on the end plate, through which the electrolyte is introduced. Since there are multiple components between the end plate and the electrode, the electrolyte needs to pass through multiple layers to enter the electrolysis chamber. There is a risk of leakage during the passage of the electrolyte through each layer. Therefore, to prevent leakage, seals need to be installed on each layer. However, this increases the number of components in the electrolyzer, increasing its weight and volume, as well as its manufacturing cost. Furthermore, because the electrolyte is corrosive, it corrodes the end plate during introduction, causing passivation and affecting its lifespan, further increasing the cost of the electrolyzer.

[0039] Based on this, this application provides an electrode plate and an electrolytic cell. By introducing electrolyte from the outer peripheral surface of the electrode plate, the electrolyte does not need to pass through the end plate to enter the electrolytic cell, thereby reducing the leakage surface of the electrolyte when it is introduced into the electrolytic cell, reducing the risk of leakage, and reducing the number of seals, so as to solve the problems of large weight and volume and high manufacturing cost of the electrolytic cell.

[0040] This application discloses an electrode plate that can be applied to an electrolyzer to produce hydrogen by electrolysis of water.

[0041] To facilitate understanding of the structure of the electrode plates and electrolytic cell, the electrode plates and electrolytic cell will be further described below with reference to embodiments and accompanying drawings. It should be noted that the following description is merely illustrative and not intended to limit the scope of this application.

[0042] Please refer to the following: Figures 1 to 4 This application provides an electrolytic cell 2, comprising an anode end plate 21, an anode plate 22, an anode sealing gasket 23, an anode diffusion layer 24, a membrane electrode 25, a cathode diffusion layer 26, a cathode sealing gasket 27, a cathode plate 28, and a cathode end plate 29 arranged sequentially. The anode plate 22 and the cathode plate 28 are both electrode plates 1 (see [link to relevant documentation]). Figure 5 Please combine) Figures 5 to 9 The electrode 1 includes a plate body 11 and a flow field structure 12. The plate body 11 has a first surface 111 and a second surface 112 that are disposed opposite to each other. An outer peripheral surface connects the first surface 111 and the second surface 112. The plate body 11 is provided with a first gas-liquid flow channel 13 and a second gas-liquid flow channel 14. The first gas-liquid flow channel 13 and the second gas-liquid flow channel 14 are located between the first surface 111 and the second surface 112 and penetrate the outer peripheral surface. The flow field structure 12 is disposed on the first surface 111, which faces the membrane electrode 25. The flow field structure 12 includes a first flow channel 121. The first flow channel 121 is provided with a first inlet 121a and a first outlet 121b. The first inlet 121a is connected to the first gas-liquid flow channel 13, and the first outlet 121b is connected to the second gas-liquid flow channel 14.

[0043] The electrode plate 1 and electrolytic cell 2 provided in this application embodiment are configured with a first gas-liquid flow channel 13 and a second gas-liquid flow channel 14 located between the first surface 111 and the second surface 112 and penetrating the outer peripheral surface. The flow field structure 12 is disposed on the first surface 111. The first inlet 121a of the first flow channel 121 is connected to the first gas-liquid flow channel 13, and the first outlet 121b is connected to the second gas-liquid flow channel 14. This allows the electrolyte to enter the flow field from the side of the electrode plate 1 to participate in the electrolysis reaction, and to flow out from the side of the electrode plate 1 after the electrolysis reaction is completed. In this way, the flow path of the electrolyte is restricted within the electrode plate 1. This not only effectively reduces the leakage surface of the electrolyte when it is introduced into the electrolytic cell 2, reducing the risk of leakage and ensuring the reliability of the electrolytic cell 2, but also reduces the risk of electrolyte corrosion of components, ensuring the service life of components and reducing costs. Meanwhile, by controlling the flow path of the electrolyte within the electrode plate 1, the number of seals can be reduced, which helps to simplify the structure of the electrolytic cell 2, facilitates assembly, and reduces the mold opening cost and material cost of the seals, thereby reducing the manufacturing cost of the electrolytic cell 2.

[0044] Furthermore, by setting the flow field structure 12 on the electrode plate 1, the electrode plate 1 and the flow field plate are integrated into one unit, which can save the step of separately processing and designing the electrode plate 1 and the flow field plate. This is beneficial to improve the overall installation accuracy of the electrolytic cell 2, reduce cumulative errors, and make the processing accuracy better controllable.

[0045] In some embodiments, the outer peripheral surface includes a first side surface 113 and a second side surface 114, a first gas-liquid flow channel 13 passing through the first side surface 113, and a first and second gas-liquid flow channel 14 passing through the second side surface 114.

[0046] In this way, the first gas-liquid flow channel 13 and the second gas-liquid flow channel 14 are located on both sides of the plate body 11, which can make reasonable use of space and reserve enough space for electrolyte supply and gas collection, so as to facilitate the assembly and use of the electrolyzer 2. At the same time, taking the opening of the first gas-liquid flow channel 13 through the first side 113 as the electrolyte inlet and the opening of the second gas-liquid flow channel 14 through the second side 114 as the gas-liquid outlet as an example, the electrolyte inlet and gas-liquid outlet of the plate body 11 are located on two opposite sides of the electrode plate 1, which can help to place the first inlet 121a and the first outlet 121b on both sides of the plate body 11, thereby extending the path of the first flow channel 121, and thus extending the flow path of the electrolyte in the flow field structure 12, so that the electrolyte is more evenly distributed in the electrode plate 1 and the efficiency of hydrogen production in the electrolyzer 2 is improved.

[0047] Optionally, the first gas-liquid flow channel 13 is located at the bottom of the plate body 11, and the second gas-liquid flow channel 14 is located at the top of the plate body 11. This allows the electrolyte inlet to be located at the bottom of the electrode plate 1 so that the electrolyte can enter the first gas-liquid flow channel 13, and the gas-liquid outlet to be located at the top of the electrode plate 1. That is, the outlets of hydrogen and oxygen generated by the reaction in the electrolytic cell 2 are located at the top of the electrode plate 1, which is beneficial for collecting hydrogen and oxygen.

[0048] Optionally, the second gas-liquid flow channel of the anode plate 22 and the second gas-liquid flow channel of the cathode plate 28 are located on different sides of the electrolytic cell 2. This allows the hydrogen outlet and oxygen outlet to be located on different sides of the electrolytic cell 2, providing sufficient space for collection devices at both outlets to facilitate the collection of hydrogen and oxygen. It also helps to isolate hydrogen and oxygen, reducing their mixing and mitigating the risk of explosion caused by hydrogen mixing with other gases, thus improving safety.

[0049] Optionally, the outer peripheral surface also includes an upper surface 115 and a lower surface 116 opposite to each other. One end of the upper surface 115 is connected to the first side surface 113, and the other end of the upper surface 115 is connected to the second side surface 114. The electrode plate 1 also includes an electrode tab 15, which is connected to the upper surface 115.

[0050] In this way, the tab 15 is located on different sides of the electrode plate 1, which can make reasonable use of space and reserve enough space for electrolyte supply and gas collection, so as to facilitate the assembly and use of the electrolytic cell 2.

[0051] In some embodiments, the first flow channel 121 is arranged to bend back and forth along a first direction so that the first flow channel 121 has a serpentine structure, and the first inlet 121a and the first outlet 121b are respectively arranged at both ends of the first flow channel 121 and located at both ends of the diagonal of the flow field structure 12.

[0052] This extends the flow path of the electrolyte in the first flow channel 121, resulting in a more uniform distribution of the electrolyte in the electrode plate 1. This ensures sufficient electrolyte supply during electrolysis, improving electrolyte utilization and reaction efficiency, and reducing electrolyte flow resistance. This facilitates the discharge of reaction products (e.g., bubbles), reduces bubble accumulation, lowers energy consumption, and consequently reduces costs. Simultaneously, the first inlet 121a and the first outlet 121b are located at opposite ends of the diagonal of the flow field structure 12, allowing the first inlet 121a and the second inlet to be closer to the first side surface 113 and the second side surface 114. This shortens the length of the first gas-liquid flow channel 13 and the second gas-liquid flow channel 14, reducing the length of ineffective gas-liquid paths (i.e., unused sections), thereby improving the hydrogen production efficiency of the electrolyzer 2.

[0053] Optionally, the first direction may be from the first side 113 to the second side 114, which helps to reduce the fluid resistance of the first flow channel 121 and facilitates the flow of electrolyte in the first flow channel 121.

[0054] Understandably, in other embodiments, the first direction may also be perpendicular to the direction from the first side 113 to the second side 114, or it may be at an angle to the direction from the first side 113 to the second side 114.

[0055] Optionally, the flow field structure 12 further includes a rib 122, which extends along the extension direction of the first flow channel 121 and is located within the first flow channel 121, thereby dividing the first flow channel 121 into two sub-flow channels. This increases the number of flow channels in the flow field structure 12, which is beneficial for fluid diversion, resulting in a more uniform distribution of the electrolyte, and provides more exhaust paths for the gas, accelerating the removal of the generated gas (oxygen and hydrogen) from the electrode plate 1, and reducing the gas resistance effect caused by bubble retention and accumulation.

[0056] Optionally, the height of the rib 122 is less than the height of the inner wall of the first flow channel 121, and the end of the rib 122 away from the bottom wall of the first flow channel 121 is lower than the first surface 111; or, the end of the rib 122 away from the bottom wall of the first flow channel 121 is flush with the first surface 111. This ensures that the rib 122 does not protrude relative to the first surface 111, which helps to reduce the gap between the electrode plate 1 and the diffusion layer, thereby reducing the thickness and number of sealing gaskets and improving the sealing performance of the electrolytic cell 2.

[0057] In some embodiments, the anode plate 22 and the cathode plate 28 can be made of any of the following materials: pure nickel, nickel-plated stainless steel, or nickel-plated carbon steel. The specific materials can be set according to actual needs and are not limited here.

[0058] Please refer to it again. Figure 4 In some embodiments, the anode sealing gasket 23 is provided with a first mounting hole 231 extending from the first surface 111 to the second surface 112, and the cathode sealing gasket 27 is provided with a second mounting hole 271 extending from the first surface 111 to the second surface 112. The first mounting hole 231 and the second mounting hole 271 correspond to the flow field structure 12. The anode diffusion layer 24 is embedded in the first mounting hole 231, and the cathode diffusion layer 26 is embedded in the second mounting hole 271.

[0059] In this way, using a sealing gasket to support and fix the diffusion layer can help maintain the correspondence between the diffusion layer and the flow field structure 12, so as to facilitate the uniform distribution and effective diffusion of gas and liquid. At the same time, the diffusion layer is embedded in the mounting hole of the sealing gasket, which not only allows the electrolytic cell 2 to be sealed by the sealing gasket, reducing the risk of leakage of electrolyte and gas, but also makes reasonable use of space, which helps to reduce the thickness of the electrolytic cell 2.

[0060] Optionally, the thickness of the anode diffusion layer 24 is less than or equal to the thickness of the anode sealing gasket 23, and the thickness of the cathode diffusion layer 26 is less than or equal to the thickness of the cathode sealing gasket 27. This helps to ensure the sealing effect of the sealing gasket between the membrane electrode 25 and the electrode plate 1, and reduces the gap between the sealing gasket and the membrane electrode 25 or the electrode plate 1, thereby reducing the risk of electrolyte or gas leakage.

[0061] Optionally, the shapes of the anode diffusion layer 24 and the cathode diffusion layer 26 are adapted to the shape of the flow field structure 12, so as to facilitate the transfer of all or most of the electrolyte in the flow field structure 12 to the membrane electrode 25 by the diffusion layer, thereby improving the working efficiency of the electrolytic cell 2.

[0062] Optionally, the anode sealing gasket 23 and the cathode sealing gasket 27 can be made of any one of polytetrafluoroethylene, fluororubber or asbestos, and the anode diffusion layer 24 and the cathode diffusion layer 26 can be made of any one of nickel foam, titanium felt, nickel felt, nickel mesh or stainless steel felt. The specific materials can be set according to actual needs, and there are no restrictions here.

[0063] In some embodiments, the anode end plate 21 and the cathode end plate 29 are made of insulating material. This allows the anode end plate 21 and the cathode end plate 29 to provide insulation and support against pressure, integrating the end plate and the insulating plate into one unit. This helps reduce material costs, the thickness and weight of the electrolytic cell 2, and eliminates the need for a seal between the end plate and the insulating plate, further reducing costs and the thickness and weight of the electrolytic cell 2. Furthermore, since the thermal deformation of insulating materials during processing is less than that of metal materials, using insulating material for the end plates, compared to metal end plates, reduces both material costs and processing difficulty, thereby reducing tool wear and processing costs.

[0064] Alternatively, the endplate can be made of polyphenylene sulfide, polysulfone, polyetheretherketone, polyoxymethylene, phenolic laminate paperboard, or other materials that meet the FR-4 fire resistance rating. Compared to metal endplates, this method offers lighter weight and lower cost.

[0065] Please combine Figure 1 , Figure 2 and Figure 4In some embodiments, the anode plate 21, anode plate 22, anode sealing gasket 23, membrane electrode 25, cathode sealing gasket 27, cathode plate 28, and cathode plate 29 are respectively provided with connecting holes 20 extending from the first surface 111 to the second surface 112. Threaded connectors are sequentially inserted into each connecting hole 20, with one end of the threaded connector abutting against the anode plate 21, and the end of the threaded connector away from the anode plate 21 being threadedly connected to a threaded fastener.

[0066] In this way, the installation method of using threaded connection makes the disassembly and assembly of electrolytic cell 2 simpler and more convenient. By adjusting the connection between the threaded connector and the threaded fastener, the contact pressure between the components in electrolytic cell 2 can also be controlled, so as to flexibly adjust the electrolytic cell 2 and make the performance of electrolytic cell 2 meet the preset requirements.

[0067] Optionally, the number of connection holes 20 for each component can be multiple. For example, the number of connection holes 20 between the anode plate 22 and the cathode plate 28 can be multiple. Multiple connection holes 20 are arranged at intervals around the outer periphery of the flow field structure 12 to improve the positioning reliability of each component in the electrolytic cell 2 and improve the structural stability of the electrolytic cell 2.

[0068] Optionally, the threaded connector may be a bolt, and the threaded fastener may be a nut.

[0069] Understandably, in other embodiments, the threaded connector may also be a screw or stud, etc.

[0070] During the assembly of electrolytic cell 2, either the cathode side or the anode side of membrane electrode 25 can be assembled first, depending on actual needs; no restrictions are imposed here. This embodiment uses the assembly of the anode side of membrane electrode 25 first as an example to provide a simple illustration of the assembly process of electrolytic cell 2.

[0071] When assembling the electrolytic cell 2, firstly, bolts are passed through the anode end plate 21, with the head of the bolt abutting against one side of the anode end plate 21. The anode plate 22 is then moved to the side of the anode end plate 21 away from the bolt head, with the second surface 112 of the anode plate 22 facing the anode end plate 21. The anode plate 22 is then passed through the bolts and pressed tightly against the anode end plate 21. Subsequently, the anode sealing gasket 23 is passed through the bolts and pressed tightly against the first surface 111 of the anode plate 22. The anode diffusion layer 24 is then embedded in the first mounting hole 231 of the anode sealing gasket 23, so that the anode diffusion layer 24 corresponds to the flow field structure 12 of the anode plate 22. Finally, the membrane electrode 25 is passed through the bolts and pressed tightly against the anode sealing gasket 23 to complete the anode side assembly of the membrane electrode 25. The assembly sequence of the cathode side of the membrane electrode 25 is the reverse of that of the anode side. After the membrane electrode 25 is installed, firstly, the cathode sealing gasket 27 is passed through the bolt and pressed tightly against the side of the membrane electrode 25 away from the anode sealing gasket 23. The cathode diffusion layer 26 is then embedded into the second mounting hole 271 of the cathode sealing gasket 27. Next, the first surface 111 of the cathode plate 28 is passed through the bolt towards the cathode sealing gasket 27 and pressed tightly against the cathode sealing gasket 27, so that the cathode diffusion layer 26 corresponds to the flow field structure 12 of the cathode plate 28. Then, the cathode end plate 29 is passed through the bolt and pressed tightly against the second surface 112 of the cathode plate 28. Finally, a nut is inserted into the end of the bolt, so that the nut abuts against the side of the cathode end plate 29 away from the cathode plate 28. The tightening torque is calculated according to the contact area between the components, and the bolts are tightened by applying pressure with a wrench or other tools.

[0072] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A plate, characterized in that The application is applied to an electrolytic cell, and the cathode plate comprises: a plate body having a first surface and a second surface arranged oppositely, and an outer circumferential surface connected between the first surface and the second surface, the plate body being provided with a first gas-liquid flow channel and a second gas-liquid flow channel, the first gas-liquid flow channel and the second gas-liquid flow channel being located between the first surface and the second surface and penetrating through the outer circumferential surface; a flow field structure arranged on the first surface, the flow field structure comprising a first flow channel provided with a first inlet and a first outlet, the first inlet being communicated with the first gas-liquid flow channel, and the first outlet being communicated with the second gas-liquid flow channel.

2. The pole plate of claim 1, wherein The outer circumferential surface comprises a first side surface and a second side surface oppositely, the first gas-liquid flow channel penetrating through the first side surface, and the first gas-liquid flow channel penetrating through the second side surface.

3. The pole plate of claim 2, wherein The outer circumferential surface further comprises a top surface and a bottom surface oppositely, one end of the top surface being connected to the first side surface, the other end of the top surface being connected to the second side surface, and the cathode plate further comprising a tab connected to the top surface.

4. The pole plate of claim 1, wherein The first flow channel is arranged in a reciprocating bending manner along a first direction, and the first inlet and the first outlet are arranged at two ends of the first flow channel and located at two ends of a diagonal line of the flow field structure.

5. The pole plate of claim 1, wherein The flow field structure further comprises a protruding rib extending along an extension direction of the first flow channel and located in the first flow channel, so that the first flow channel is divided to form two sub-flow channels.

6. An electrolytic cell characterized in that, The application further provides a membrane-electrode assembly comprising an anode end plate, an anode plate, an anode sealing gasket, an anode diffusion layer, a membrane electrode, a cathode diffusion layer, a cathode sealing gasket, a cathode plate and a cathode end plate arranged in sequence, wherein the anode plate and the cathode plate are the cathode plate as claimed in any one of claims 1-5, and the first surface faces the membrane electrode.

7. The electrolytic cell of claim 6, wherein, The anode end plate and the cathode end plate are made of insulating material.

8. The electrolytic cell of claim 6, wherein, The anode sealing gasket is provided with a first mounting hole penetrating through in a direction from the first surface to the second surface, the cathode sealing gasket is provided with a second mounting hole penetrating through in a direction from the first surface to the second surface, the first mounting hole and the second mounting hole correspond to the flow field structure, the anode diffusion layer is embedded in the first mounting hole, and the cathode diffusion layer is embedded in the second mounting hole.

9. The electrolytic cell of claim 6, wherein, The second gas-liquid flow channel of the anode plate and the second gas-liquid flow channel of the cathode plate are located at different sides of the electrolytic cell.

10. The electrolytic cell of claim 6, wherein, The anode end plate, the anode plate, the anode sealing gasket, the membrane electrode, the cathode sealing gasket, the cathode plate and the cathode end plate are provided with connecting holes penetrating through in a direction from the first surface to the second surface, respectively, a threaded connecting piece is sequentially arranged in the connecting holes, one end of the threaded connecting piece abuts against the anode end plate, and the end of the threaded connecting piece away from the anode end plate is threadedly connected with a threaded fastener.

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