Electrode plate frame and electrolytic bath

Abstract

Disclosed in the present application are an electrode plate frame and an electrolytic bath, which relate to the technical field of electrolytic hydrogen production and are used for solving the problem of leakage at the joint of an electrode plate frame and an external pipeline. The electrode plate frame comprises an annular frame body, one or more fluid inlets / outlets being formed in the outer circumferential surface of the annular frame body, and mounting holes being formed in the positions on the outer circumferential surface of the annular frame body around each fluid inlet / outlet, such that each fluid inlet / outlet and the corresponding mounting holes form a flange structure to be connected to an external pipeline. Compared with the existing practice of welding a pipeline at fluid inlet / outlets, the fluid inlets / outlets in the annular frame body of the present application do not need welding and have no welding spot, thereby preventing generation of stress corrosion, further preventing the phenomenon of galvanic corrosion caused by a welding material being different from materials of a pipeline and an electrode plate frame during welding, and reducing the risk of leakage at the joint of the electrode plate frame and the external pipeline.

Description

Electrode plate frame and electrolytic cell

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and benefits of Chinese patent application No. 202420267881.2 filed on February 2, 2024 and No. 202420272522.6 filed on February 2, 2024, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present application relates to the technical field of electrolytic hydrogen production, and in particular to a plate frame and an electrolytic cell. Background Art

[0004] Existing hydrogen production equipment is typically a filter-press bipolar electrolyzer, comprising two end plates and multiple bipolar plates in the middle. An electrolyte inlet and a gas outlet are located on one end plate. The electrolyte inlet is connected to an external electrolyte supply pipeline for introducing electrolyte into the electrolyzer, while the gas outlet is connected to an external gas pipeline for discharging the gas generated after electrolysis. Existing technology typically welds pipes at the electrolyte inlet and gas outlet to facilitate external piping connections. Residual stress caused by pipe welding can easily cause the anti-corrosion coating at the electrolyte inlet and gas outlet to fall off. Furthermore, due to various factors such as cavitation, erosion, and stress corrosion within the electrolyte inlet and gas outlet, leaks are very likely to occur at the welds. Summary of the Invention

[0005] The purpose of the present application is to provide a plate frame and an electrolytic cell to reduce the risk of leakage at the connection between the plate frame and the external pipeline.

[0006] In the first aspect, the present application provides a plate frame, including an annular frame body, wherein the outer peripheral surface of the annular frame body is provided with one or more fluid inlets and outlets, and mounting holes are provided around each fluid inlet and outlet. The mounting holes are located on the outer peripheral surface of the annular frame body, so that each fluid inlet and outlet and the corresponding mounting hole form a flange structure for connecting to an external pipeline.

[0007] When adopting the above technical solution, mounting holes are directly provided on the outer peripheral surface of the annular frame at locations surrounding the fluid inlet and outlet, and a flange structure is directly formed integrally on the annular frame, through which the fluid inlet and outlet are connected to the external pipeline. Compared to the existing practice of welding pipelines at the inlet and outlet, the fluid inlet and outlet of the annular frame of the present application do not require welding, and there are no welding points, thus avoiding stress corrosion. Moreover, there is no galvanic corrosion caused by the different materials of the welding material, pipeline, and plate frame, which is only seen with welding, thereby reducing the risk of leakage at the connection between the plate frame and the external pipeline.

[0008] In some possible implementations, the flange surface of the flange structure is flat. Thus, during manufacturing, the circumferential surface of the annular frame can be cut to correspond to the surface of the flange structure, resulting in a flat flange surface. This allows the flange structure to more closely and securely contact the flange of the external pipeline, further reducing the risk of leakage at the connection between the plate frame and the external pipeline.

[0009] In some possible implementations, the outer circumferential surface of the annular frame is provided with a plurality of circumferentially spaced clearance notches, extending parallel to the axis of the annular frame. Because mounting holes need to be radially defined in the annular frame, to ensure effective connection depth and prevent penetration of the mounting holes through the flow passage within the annular frame, the annular frame needs to have an increased radial thickness, and accordingly, an increased outer diameter. To minimize the increase in the circumferential diameter of the tensioning bolts and the diameter of the end pressure plate, and thus production costs, clearance notches are provided on the outer circumferential surface of the annular frame in areas where they would interfere with the tensioning bolts.

[0010] In some possible implementations, the multiple fluid inlets and outlets include a gas outlet and an electrolyte inlet. In this way, the gas outlet and electrolyte inlet on the annular frame for connecting to external pipelines can both be configured as flange structures to reduce the risk of leakage at the connection between the plate frame and the external pipeline.

[0011] In some possible implementations, the electrolyte inlet penetrates the annular frame in a radial direction, and the annular frame is further provided with an electrolyte distribution channel. The inlet of the electrolyte distribution channel is opened on the inner circumferential surface of the annular frame, and the outlet of the electrolyte distribution channel is opened on both end surfaces of the annular frame. In this way, the electrolyte enters the chamber within the inner circle of the annular frame from the electrolyte inlet, and then enters the electrolyte distribution channel from the chamber. The electrolyte is distributed to each electrolytic chamber located on both sides of the plate frame through the electrolyte distribution channel. This electrolyte entry and distribution method allows the electrolyte to be quickly and evenly replenished to each electrolytic chamber, reducing concentration polarization during the electrolysis process, reducing the energy consumption of the electrolytic cell, and laying the foundation for increasing the current density.

[0012] In some possible implementations, the electrolyte distribution channels include at least two anode distribution channels and at least two cathode distribution channels, with the anode distribution channels and cathode distribution channels alternately arranged along the circumference of the plate frame. This allows the electrolyte to diffuse into each anode chamber and each cathode chamber at multiple points within a relatively large central angle of each plate assembly, resulting in a more uniform electrolyte distribution flow field within the anode chamber and cathode chamber, improving the uniformity of the electrolysis reaction and reducing the energy consumption of the electrolytic cell.

[0013] In some possible implementations, the central angle between the two electrolyte anode distribution channels located at the ends of the at least two electrolyte cathode distribution channels is 60° to 180°, and / or the central angle between the two electrolyte cathode distribution channels located at the ends of the at least two electrolyte anode distribution channels is 60° to 180°. This arrangement expands the diffusion range of the electrolyte within the anode chamber and the cathode chamber, improving distribution uniformity.

[0014] In some possible implementations, the electrolyte distribution channel has a T-shaped channel structure. Thus, the T-shaped channel structure has radial and axial sections that are perpendicularly connected to each other. The electrolyte first enters the radial section of the T-shaped channel structure along the radial direction of the annular frame, then enters the axial section to be distributed to both sides. This electrolyte distribution channel has a simple structure and is easy to manufacture.

[0015] In some possible implementations, the gas outlet includes an oxygen outlet and a hydrogen outlet. The oxygen outlet communicates with an oxygen collection channel disposed within the annular frame, and the hydrogen outlet communicates with a hydrogen collection channel disposed within the annular frame. Thus, the mixed fluid of oxygen and electrolyte collected in the oxygen collection channel is discharged from the electrolytic cell through the oxygen outlet, while the mixed fluid of hydrogen and electrolyte collected in the hydrogen collection channel is discharged from the electrolytic cell through the hydrogen outlet, for separate discharge, thereby improving the purity of the prepared gas.

[0016] In some possible implementations, the outer diameter of the annular frame is 2m to 3m, and the radial thickness of the annular frame is 20cm to 30cm. The annular frame has a relatively large outer diameter, which is suitable for large electrolytic cells. The radial thickness of the annular frame can meet the depth requirements of the mounting hole and improve the connection strength with the external pipeline.

[0017] In a second aspect, the present application also provides an electrolytic cell comprising two end pressure plates and a plurality of electrode plate assemblies located between the two end pressure plates, wherein an electrolysis chamber is formed between two adjacent electrode plate assemblies, and at least one of the plurality of electrode plate assemblies comprises the electrode plate frame as described above.

[0018] Since the electrolytic cell adopts the same plate frame as the first aspect, it has the same beneficial effects as the plate frame, which will not be described in detail here.

[0019] In some possible implementations, at least one of the multiple plate assemblies located at either end includes the plate frame described in the first aspect. Thus, the connection between the electrolytic cell and the external pipeline is located on the plate frame of the plate assembly at the end of the electrolytic cell. The electrolyte enters the electrolytic cell from one end and then flows to the other end into the various electrolysis cells. Accordingly, the gas generated by electrolysis is also discharged from the plate frame of the plate assembly at the end of the electrolytic cell.

[0020] In some possible implementations, the two electrode plate assemblies at the two ends of the multiple electrode plate assemblies are respectively a positive electrode plate assembly and a negative electrode plate assembly. The positive electrode plate assembly and the negative electrode plate assembly are each positioned adjacent to one of the two end pressure plates, and the negative electrode plate assembly includes the aforementioned electrode plate frame. In this manner, the connection point between the electrolytic cell and the external pipeline is located on the electrode plate frame of the negative electrode plate assembly at one end of the electrolytic cell. The electrolyte enters from the negative electrode plate assembly and then flows toward the positive electrode plate assembly. During this process, the electrolyte enters each electrolysis chamber. Accordingly, the gas generated by electrolysis is also discharged from the electrode plate frame of the negative electrode plate assembly located at the end of the electrolytic cell.

[0021] In some possible implementations, the two plate assemblies at the ends of the multiple plate assemblies are both negative plate assemblies, and the central plate assembly of the multiple plate assemblies is a positive plate assembly, wherein the negative plate assembly includes the aforementioned plate frame. In this manner, the connection points between the electrolytic cell and the external pipeline are both located on the plate frames of the negative plate assemblies at both ends of the electrolytic cell. The electrolyte enters the electrolytic cell through the negative plate assemblies at both ends and then flows toward the center to enter the various electrolysis cells. Accordingly, the gas generated by electrolysis is also discharged from the plate frames of the negative plate assemblies at both ends of the electrolytic cell.

[0022] In some possible implementations, one of the multiple plate assemblies located in the middle includes the plate frame described above. Thus, the locations where the electrolytic cell is connected to the external pipeline are both located on the plate frame of the plate assembly in the middle of the electrolytic cell. The electrolyte enters the middle of the electrolytic cell and then flows to each electrolysis chamber at both ends. Accordingly, the gas generated by electrolysis is also discharged from the plate frame of the plate assembly located in the middle of the electrolytic cell. Thus, the electrolyte enters the chamber within the plate frame from at least one location in the middle of the electrolytic cell. Thereafter, the electrolyte is distributed to both sides through the electrolyte anode distribution channel and the electrolyte cathode distribution channel, entering the anode chamber and the cathode chamber, respectively. This shortens the electrolyte distribution path and enables rapid electrolyte distribution.

[0023] In some possible implementations, at least one plate assembly including the plate frame further includes two flat plates, which are parallel to each other and fixed to the edge of the plate frame at intervals. The plate frame and the two flat plates form an electrolyte cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] FIG1 is a schematic structural diagram of a plate frame provided in an embodiment of the present application;

[0026] FIG2 is a partially enlarged schematic diagram of a plate frame provided in an embodiment of the present application;

[0027] FIG3 is a schematic front view of a plate frame provided in an embodiment of the present application;

[0028] FIG4 is a schematic structural diagram of an electrolytic cell provided in an embodiment of the present application;

[0029] FIG5 is a schematic structural diagram of another electrolytic cell provided in an embodiment of the present application;

[0030] FIG6 is a schematic structural diagram of another electrolytic cell provided in an embodiment of the present application;

[0031] FIG7 is a schematic diagram of the internal structure of an electrolytic cell provided in an embodiment of the present application;

[0032] FIG8 is a schematic diagram of fluid flow in an electrolytic cell provided in an embodiment of the present application;

[0033] FIG9 is a side cross-sectional schematic diagram of an intermediate plate assembly provided in an embodiment of the present application;

[0034] FIG10 is a schematic structural diagram of a plate frame of a bipolar plate provided in an embodiment of the present application.

[0035] Reference numerals: 1 is an annular frame, 11 is an electrolyte inlet, 12 is a chamber, 13 is an electrolyte distribution channel, 1301 is an electrolyte anode distribution channel, 1302 is an electrolyte cathode distribution channel, 131 is an electrolyte inlet tank, 1311 is an electrolyte anode inlet tank, 1312 is an electrolyte cathode inlet tank, 14 is an avoidance gap, 15 is a flange surface, 16 is a mounting hole, 17 is an oxygen outlet, 18 is an oxygen collection channel, 181 is an oxygen The guide groove, 19 is the hydrogen outlet, 110 is the hydrogen collection channel, 111 is a flat plate, 2 is an end pressure plate, 3 is a plate assembly, 301 is an oxygen outlet channel, 3011 is an oxygen channel, 302 is a hydrogen outlet channel, 3021 is a hydrogen channel, 303 is an anode channel, 3031 is an anode chamber channel, 304 is a cathode channel, 3041 is a cathode chamber channel, 4 is a tightening bolt, 5 is an oxygen pipeline, 6 is a hydrogen pipeline, and 7 is an electrolyte pipeline. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0037] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0039] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0041] Referring to Figures 1-3, an embodiment of the present application provides a plate frame, comprising an annular frame 1, wherein the outer circumferential surface of the annular frame 1 is provided with one or more fluid inlets and outlets, such as an electrolyte inlet 11, a hydrogen outlet 19, and an oxygen outlet 17; mounting holes 16 are provided on the outer circumferential surface of the annular frame 1 at positions surrounding each fluid inlet and outlet, so that each fluid inlet and outlet and the corresponding mounting hole 16 form a flange structure for connecting to an external pipeline, wherein the mounting holes 16 can be threaded holes, the number of which is consistent with the number of connection holes of the flange of the external pipeline. It should be noted that when the annular frame 1 is a circular annular frame, the outer circumferential surface of the annular frame 1 refers to the outer circumferential surface of the annular frame 1, and the inner circumferential surface of the annular frame 1 refers to the inner circumferential surface of the annular frame 1.

[0042] When the above technical solution is adopted, since mounting holes 16 are directly provided around the fluid inlet and outlet, and the mounting holes 16 are located on the outer peripheral surface of the annular frame, a flange structure is directly formed on the annular frame 1, and the fluid inlet and outlet are connected to the external pipeline through the flange structure. Compared with the existing practice of welding pipelines at the inlet and outlet, the fluid inlet and outlet of the annular frame 1 of the present application do not require welding, there are no welding points, and thus no residual stress generated by welding, thus avoiding stress corrosion. In addition, there will be no galvanic corrosion caused by the different materials of the welding material, the pipeline, and the plate frame, thereby reducing the risk of leakage at the connection between the plate frame and the external pipeline.

[0043] Furthermore, in some embodiments, the flange surface 15 of the flange structure is flat. Thus, during manufacturing, the outer circumferential surface of the annular frame 1 corresponding to the flange structure can be cut to obtain a flat flange surface 15. This allows the flange structure to more closely and securely contact the flange of the external pipeline, further reducing the risk of leakage at the connection between the plate frame and the external pipeline. Of course, the flange surface 15 of the flange structure can also remain as the arc surface of the annular frame 1 without cutting, and when assembled with the external pipeline, a flange that closely matches this arc surface can be selected.

[0044] As shown in Figures 1-3, in some embodiments, the outer circumferential surface of the annular frame 1 is provided with a plurality of circumferentially spaced relief notches 14. The relief notches 14 extend parallel to the axis of the annular frame 1 and are used to accommodate the tension bolts 4 of the electrolytic cell. The relief notches 14 can have an arcuate, rectangular, or trapezoidal cross-section, as long as they can accommodate the tension bolts 4. The number of relief notches 14 can be the same as the number of tension bolts 4 and their circumferential arrangement corresponds one-to-one, or the number of relief notches 14 can be greater than the number of tension bolts 4. Because mounting holes 16 are required to be provided radially within the annular frame 1, to ensure effective connection depth for the mounting holes 16 and to prevent them from penetrating flow channels within the annular frame 1, such as the hydrogen collection channel, the oxygen collection channel, or the electrolyte distribution channel, the annular frame 1 needs to have an increased radial thickness. Accordingly, the outer diameter of the annular frame 1 needs to be increased without reducing the internal volume of the electrolytic cell, i.e., without reducing the inner diameter of the annular frame 1. Conventionally, when the outer diameter of the annular frame 1 increases, the circumferential diameter of the tension bolts 4 needs to be increased accordingly. Accordingly, in order to secure the ends of the tension bolts 4, the diameter of the end pressure plate 2 also needs to be increased, but this increases material costs. Therefore, in order to avoid increasing production costs, the present application chooses to provide avoidance notches 14 on the outer circumferential surface of the annular frame 1 in the area where interference with the tension bolts 4 occurs, without increasing the circumferential diameter of the tension bolts 4 or the diameter of the end pressure plate 2. This reduces the total weight of the annular frame and electrolytic cell, as well as the material cost.

[0045] As shown in Figures 1 and 3, in some possible implementations, the multiple fluid inlets and outlets include a gas outlet and / or an electrolyte inlet 11. The electrolyte inlet 11 is used to pass the electrolyte in the external pipeline into the electrolytic cell. That is, only the gas outlet can be set as a flange structure, or only the electrolyte inlet 11 can be set as a flange structure, or both the gas outlet and the electrolyte inlet 11 can be set as flange structures. In this way, the gas outlet and / or electrolyte inlet 11 on the annular frame 1 for connection to the external pipeline can be set as flange structures to reduce the risk of leakage at the connection between the plate frame and the external pipeline.

[0046] As shown in Figures 1 and 3, in some embodiments, the electrolyte inlet 11 penetrates the annular frame 1 along the radial direction of the annular frame 1, and the annular frame 1 is further provided with an electrolyte distribution channel 13. The inlet of the electrolyte distribution channel 13 is opened on the inner circumferential surface of the annular frame 1, that is, the inlet of the electrolyte distribution channel 13 is distributed on the inner circumferential surface of the annular frame 1, and the outlet of the electrolyte distribution channel 13 is opened on the two end surfaces of the annular frame 1, that is, the outlet of the electrolyte distribution channel 13 is distributed on the two end surfaces of the annular frame 1 in the axial direction. In this way, as shown in Figure 8, the electrolyte enters the chamber 12 within the inner ring of the annular frame 1 from the electrolyte inlet 11, and then enters the electrolyte distribution channel 13 from the chamber 12, and distributes the electrolyte to each electrolysis chamber located on both sides of the plate frame through the electrolyte distribution channel 13. The electrolyte entry and distribution method can enable the electrolyte to be quickly and evenly replenished to each electrolysis chamber, reduce the concentration polarization phenomenon during the electrolysis process, reduce the energy consumption of the electrolytic cell, and increase the current density.

[0047] Further, the electrolyte distribution flow channel 13 is a T-type flow channel structure. Like this, the T-type flow channel structure has a radial section and an axial section that are vertically connected to each other, the radial section is arranged along the radial direction of the annular frame 1, the two ends of the radial section are communicated with the chamber and the axial section respectively, the axial section runs through the two end faces of the annular frame 1 along the axial direction of the annular frame 1, the electrolyte first enters the radial section of the T-type flow channel structure along the radial direction of the annular frame 1, and then enters the axial section to distribute electrolyte to both sides, the structure of this electrolyte distribution flow channel is simple, convenient processing and manufacturing. The cross section of the radial section can be circular, oval, square, triangle etc., and the cross section of the axial section can be kidney-shaped, circular, oval, square, triangle etc. Of course, the electrolyte distribution flow channel 13 can also have other structural forms, is not limited to the form listed in the present embodiment, as long as it can be realized that the electrolyte is distributed to the electrolysis chambers on both sides from the chamber 12.

[0048] As shown in Figures 1 and 3, the gas outlet includes an oxygen outlet 17 and a hydrogen outlet 19, the oxygen outlet 17 is connected to the oxygen collection flow channel 18 arranged in the annular frame 1, and the hydrogen outlet 19 is connected to the hydrogen collection flow channel 110 arranged in the annular frame 1. The oxygen collection flow channel 18 and the hydrogen collection flow channel 110 are arranged on the upper part of the annular frame 1, and the oxygen collection flow channel 18 and the hydrogen collection flow channel 110 both pass through the two end faces of the annular frame 1 along the axial direction of the annular frame 1, and the oxygen collection flow channel 18 is connected to the anode chamber by the oxygen guide groove 181 arranged on one end face of the annular frame 1 near the anode chamber, and the hydrogen collection flow channel 110 is connected to the cathode chamber by the guide groove arranged on one end face of the annular frame 1 near the cathode chamber. Wherein, the cross-sectional shape of the oxygen collection flow channel 18 and the hydrogen collection flow channel 110 can be kidney-shaped, circular, elliptical, square or triangular, etc. The mixed fluid of oxygen and electrolyte collected in the oxygen collecting channel 18 is discharged into the external oxygen pipeline through the oxygen outlet 17, and the mixed fluid of hydrogen and electrolyte collected in the hydrogen collecting channel 110 is discharged into the external hydrogen pipeline through the hydrogen outlet 19, so as to separate the oxygen and hydrogen and improve the purity of the prepared gas.

[0049] In some possible implementations, the outer diameter of the annular frame 1 is 2m to 3m, and the radial thickness of the annular frame 1 is 20cm to 30cm. The annular frame 1 has a relatively large outer diameter, and belongs to a large electrolytic cell. The radial thickness of the annular frame 1 can meet the depth requirements of the mounting hole 16, thereby improving the connection strength with the external pipeline.

[0050] As shown in Figures 4 to 6, the present application based on any of the above embodiments also provides an electrolytic cell, which includes two end pressure plates 2 and multiple plate assemblies 3 located between the two end pressure plates 2, each plate assembly 3 includes a plate frame and a plate fixed in the plate frame, and a clamping force is applied to the end pressure plates 2 at both ends by tightening the bolts 4 to press and seal the multiple plate assemblies 3 against each other, forming an electrolytic chamber between two adjacent plate assemblies 3, wherein at least one plate assembly 3 among these plate assemblies 3 includes the plate frame described in any of the above embodiments.

[0051] Since the plate frame of the plate assembly 3 in the electrolytic cell connected to the external pipeline includes the plate frame described in any of the above embodiments, no welding is required at the fluid inlet and outlet, and there are no welding points. Therefore, there is no residual stress generated by welding, which avoids stress corrosion. There is no galvanic cell corrosion due to the different materials of the welding material, the pipeline and the plate frame, thereby reducing the risk of leakage at the connection between the plate frame and the external pipeline.

[0052] As shown in Figures 4 and 5 , the plate frame of at least one of the multiple plate assemblies 3 located at either end between the two end pressure plates 2 comprises the plate frame described in any of the above embodiments. That is, the external piping is connected to at least one plate assembly 3 located at the end of the electrolytic cell. Thus, the connection between the electrolytic cell and the external piping is located on the plate frame of the plate assembly 3 at the end of the electrolytic cell. The electrolyte enters the electrolytic cell from one end and then flows to the other end into the various electrolysis cells. Accordingly, the gas generated by electrolysis is also discharged from the plate frame of the plate assembly 3 located at the end of the electrolytic cell.

[0053] For example, as shown in FIG5 , two of the multiple electrode plate assemblies 3 between the two end pressure plates 2 are located at the two ends of the electrode plate assemblies 3, respectively, and are positive electrode plate assemblies and negative electrode plate assemblies. The positive electrode plate assembly includes a positive electrode plate and an electrode plate frame, and the negative electrode plate assembly includes a negative electrode plate and an electrode plate frame. The remaining electrode plate assemblies 3 are bipolar plate assemblies. The positive electrode plate assembly is adjacent to the end pressure plate 2 at one end, and the negative electrode plate assembly is adjacent to the end pressure plate 2 at the other end. The bipolar plate assembly is located between the positive electrode plate assembly and the negative electrode plate assembly. Electrolysis chambers are formed between the positive electrode plate assembly and an adjacent bipolar plate assembly, between two adjacent bipolar plate assemblies, and between the negative electrode plate assembly and an adjacent bipolar plate assembly. Anode chambers and cathode chambers are formed on both sides of the bipolar plate assembly, respectively. An anode chamber is formed on one side of the positive electrode plate assembly, and a cathode chamber is formed on one side of the negative electrode plate assembly. A structure in which anode chambers and cathode chambers are alternately arranged is formed in the electrolytic cell. The plate frame of the negative electrode plate assembly at one end adopts the plate frame described in any of the above embodiments.

[0054] In this way, the connection position between the electrolytic cell and the external pipeline is set on the plate frame of the negative plate assembly located at one end of the electrolytic cell. The electrolyte flows from the negative plate assembly into its chamber 12 and then flows toward the positive plate assembly. During this process, the electrolyte flows into each electrolysis chamber. Correspondingly, the gas generated by electrolysis is also discharged from the plate frame of the negative plate assembly located at the end of the electrolytic cell.

[0055] In another example, as shown in FIG4 , the two electrode plate assemblies 3 at the two ends of the plurality of electrode plate assemblies 3 between the two end pressure plates 2 are both negative electrode plate assemblies, the negative electrode plate assembly including a negative electrode plate and an electrode plate frame, the electrode plate assembly 3 in the middle is a positive electrode plate assembly, and the remaining electrode plate assemblies are all bipolar plate assemblies, one of the negative electrode plate assemblies is arranged adjacent to the end pressure plate 2 at one end, and the other negative electrode plate assembly is arranged adjacent to the end pressure plate 2 at the other end, and the bipolar plate assembly is located between the positive electrode plate assembly and the negative electrode plate assembly. The electrode plate frames of the two negative electrode plate assemblies at the two ends both adopt the electrode plate frames described in any of the above embodiments.

[0056] In this way, the electrolyte enters the respective chambers 12 from the negative plate assemblies at both ends, and then flows from both ends to the positive plate assembly in the middle. During this process, the electrolyte flows into each electrolysis chamber, and accordingly, the gas generated by electrolysis is also discharged from the plate frames of the negative plate assemblies at both ends of the electrolytic cell. This arrangement can improve the speed and uniformity of electrolyte distribution for large electrolytic cells with long lengths by distributing electrolyte from both ends to the middle, thereby improving electrolysis efficiency.

[0057] As shown in FIG6 , in some embodiments, the plate frame of a plate assembly 3 located in the middle of the multiple plate assemblies 3 between the two end pressure plates 2 adopts the plate frame described in any of the above embodiments. In this way, the location where the electrolytic cell is connected to the external pipeline is set on the plate frame of the plate assembly 3 located in the middle of the electrolytic cell. The electrolyte is introduced from the middle of the electrolytic cell and then introduced to each electrolysis chamber at both ends. Correspondingly, the gas generated by electrolysis is also discharged from the plate frame of the plate assembly 3 located in the middle of the electrolytic cell. With this arrangement, for large electrolytic cells with a long length, the electrolyte can be distributed from the middle to both sides, which can improve the distribution speed and distribution uniformity of the electrolyte and improve the electrolysis efficiency.

[0058] For example, as shown in FIG6 , the two electrode plate assemblies 3 at the two ends of the plurality of electrode plate assemblies 3 between the two end pressure plates 2 are respectively a positive electrode and a negative electrode assembly, and the electrode plate assembly in the middle of the plurality of electrode plate assemblies 3 is a bipolar plate assembly, wherein the electrode plate frame of the electrode plate assembly 3 in the middle adopts the electrode plate frame described in any of the above embodiments. In this way, the connection point between the electrolytic cell and the external pipeline is set on the electrode plate frame of the bipolar plate assembly in the middle of the electrolytic cell. The electrolyte is introduced from the electrode plate assembly in the middle of the electrolytic cell and then flows to each electrolysis chamber at both ends. Accordingly, the gas generated by electrolysis is also discharged from the electrode plate frame of the bipolar plate assembly in the middle of the electrolytic cell.

[0059] Referring to Figures 1-3 and Figures 6-8, an embodiment of the present application provides an electrolytic cell, which includes two end pressure plates 2 arranged along a first direction and a plurality of electrode plate assemblies 3 located between the two end pressure plates 2. A tightening force is applied to the two end pressure plates 2 by tightening bolts 4, thereby pressing and sealing the plurality of electrode plate assemblies 3 located between the two end pressure plates 2. Among them, at least one of the multiple electrode assemblies 3 is an intermediate bipolar plate assembly, which can be one, two, three or more, and the two adjacent intermediate bipolar plate assemblies are arranged at intervals; the two electrode assemblies 3 adjacent to the two end pressure plates 2 are single-polar plate assemblies, and the single polar plate of the single-polar plate assembly has only one electrode; the remaining electrode assemblies 3 located between the single-polar plate assembly and the intermediate bipolar plate assembly and the electrode assemblies 3 located between the two adjacent intermediate bipolar plate assemblies are bipolar plate assemblies; the two adjacent electrode assemblies 3 are sealed to form an anode chamber and a cathode chamber, wherein one side of the bipolar plate assembly is opposite to the anode chamber, and the other side is opposite to the cathode chamber, the two sides of the intermediate bipolar plate assembly correspond to the anode chamber and the cathode chamber respectively, and one side of the single-stage plate assembly corresponds to the anode chamber or the cathode chamber; the anode chamber and the cathode chamber in the electrolytic cell are arranged alternately.

[0060] Among them, the intermediate bipolar plate assembly includes an intermediate plate frame and two flat plates 111, as shown in Figures 1-3 and Figure 9. The intermediate plate frame is a ring-shaped frame structure, and the two flat plates 111 are parallel to each other and fixed at intervals on the edge of the intermediate plate frame. The intermediate plate frame and the two flat plates 111 form a chamber 12, and the two flat plates 111 serve as two electrode plates respectively, wherein the side of one flat plate 111 facing away from the chamber 12 corresponds to an anode chamber, and the side of the other flat plate 111 facing away from the chamber 12 corresponds to a cathode chamber.

[0061] The intermediate plate frame is provided with an electrolyte inlet 11, at least one electrolyte anode distribution channel 1301 and at least one electrolyte cathode distribution channel 1302. The electrolyte inlet 11 is provided on the periphery of the intermediate plate frame, and the two ends of the electrolyte inlet 11 are respectively connected to the chamber 12 and the external electrolyte pipeline 7; the inlets of the electrolyte anode distribution channel 1301 and the electrolyte cathode distribution channel 1302 are both connected to the chamber 12, the outlet of the electrolyte anode distribution channel 1301 is connected to the anode chamber, and the outlet of the electrolyte cathode distribution channel 1302 is connected to the cathode chamber; the electrolyte anode distribution channel 1301 and the electrolyte cathode distribution channel 1302 are alternately arranged along the circumference of the intermediate plate frame, that is, when the electrolyte anode distribution channel 1301 is connected to the anode chamber, the electrolyte cathode distribution channel 1302 is connected to the cathode chamber. When there are at least two flow channels 1301 and electrolyte cathode distribution flow channels 1302, there is one electrolyte cathode distribution flow channel 1302 between every two electrolyte anode distribution flow channels 1301, and there is one electrolyte anode distribution flow channel 1301 between every two electrolyte cathode distribution flow channels 1302. The number of electrolyte anode distribution flow channels 1301 can be one, two, three, four, five or more, and the number of electrolyte cathode distribution flow channels 1302 can be one, two, three, four, five or more. The number of electrolyte anode distribution flow channels 1301 and the number of electrolyte cathode distribution flow channels 1302 can be the same or differ by one, and there is one more distribution flow channel of the same type located at both ends. The electrolyte anode distribution channel 1301 is connected to the anode chamber through the electrolyte anode inlet groove 1311 arranged on one end face of the corresponding anode chamber of the intermediate electrode plate frame, and the electrolyte cathode distribution channel 1302 is connected to the cathode chamber through the electrolyte cathode inlet groove 1312 arranged on the other end face of the corresponding cathode chamber of the intermediate electrode plate frame.

[0062] During operation, referring to the electrolyte flow arrows in FIG8 (shown by solid lines), the electrolyte transported in the electrolyte pipeline 7 enters the chamber 12 in the intermediate plate frame through the electrolyte inlet 11 on at least one intermediate bipolar plate assembly of the electrolytic cell. Afterwards, the electrolyte is distributed to both sides from the electrolyte anode distribution channel 1301 and the electrolyte cathode distribution channel 1302 and enters the anode chamber and the cathode chamber respectively for electrolysis.

[0063] As can be seen from the above, the electrolyte enters the electrolytic cell from at least one position between the end pressure plates through at least one intermediate bipolar plate assembly, and the electrolyte distribution path is shortened. When an intermediate bipolar plate assembly is located in the middle position of the electrolytic cell, the electrolyte distribution path can be reduced to half the length of the electrolytic cell, which can achieve rapid distribution of the electrolyte. When there are at least two electrolyte anode distribution channels and electrolyte cathode distribution channels, since the electrolyte anode distribution channels 1301 and the electrolyte cathode distribution channels 1302 are arranged along the intermediate plate frame, the electrolyte distribution path can be shortened to half the length of the electrolytic cell, which can achieve rapid distribution of the electrolyte. The circumferential alternating arrangement can make the electrolyte diffuse into each anode chamber and each cathode chamber at multiple points within a larger central angle range of each electrode assembly 3, and can make the distribution flow field of the electrolyte in the anode chamber and the cathode chamber more uniform, thereby improving the uniformity of the electrolysis reaction and reducing the energy consumption of electrolysis. In addition, the electrolyte enters each anode chamber and cathode chamber in a multi-point and large-scale manner, which can make the thermal field distribution in the electrolysis chamber more uniform, and the flow field and thermal field of adjacent anode chambers and cathode chambers are basically symmetrical relative to the diaphragm, thereby improving the electrolysis efficiency.

[0064] As shown in Figures 1-3, 6-7, and 9, in some embodiments, the number of electrolyte inlets 11 is at least two, at least one electrolyte inlet 11 is located in the middle position of the intermediate electrode plate frame in the vertical direction, and the remaining electrolyte inlets 11 are located in the upper and / or lower part of the intermediate electrode plate frame.

[0065] For example, there may be four electrolyte inlets 11, two of which are located at both ends of the horizontal diameter direction of the intermediate plate frame, and the other two are located at the lower position or the upper position of the two ends of the horizontal diameter direction. Of course, the number of electrolyte inlets 11 can also be one, two, three, or more. In this arrangement, when the electrolyte inlet 11 is located in the middle and upper part of the intermediate plate frame, the electrolyte enters the chamber 12 from the middle and upper part of the intermediate plate frame, which can take away part of the heat in the area and promote a more uniform temperature of the intermediate plate frame and the electrolysis chambers around it. When the electrolyte inlet 11 is located in the middle and lower part of the intermediate plate frame, the electrolyte inlet 11 can be staggered a certain distance from the gas outlet at the top of the intermediate plate frame to facilitate the arrangement of external pipelines.

[0066] Furthermore, in some embodiments, the electrolyte inlet 11 penetrates the inner circumferential surface and the outer circumferential surface of the intermediate electrode plate frame along the radial direction of the intermediate electrode plate frame, which facilitates the positioning and processing of the electrolyte inlet 11. Of course, the electrolyte inlet 11 can also be inclined to the radial direction of the intermediate electrode plate frame and penetrate the inner circumferential surface and the outer circumferential surface of the intermediate electrode plate frame. The inclination means that the penetration direction of the electrolyte inlet 11 is at an angle to the radial direction of the intermediate electrode plate frame.

[0067] As shown in Figures 1 to 3, 7, and 9, the electrolyte anode distribution channel 1301 and the electrolyte cathode distribution channel 1302 both include radial and axial sections. The radial section extends radially along the intermediate plate frame, and the axial section extends axially along the intermediate plate frame, penetrating both end faces of the intermediate plate frame to form a T-shaped channel structure. The two ends of the radial section are connected to the chamber 12 and the axial section, respectively. The axial section of the electrolyte anode distribution channel 1301 is connected to the anode chamber, and the axial section of the electrolyte cathode distribution channel 1302 is connected to the cathode chamber. Specifically, the axial section of the electrolyte anode distribution channel 1301 is connected to the chamber 12 via the electrolyte anode inlet groove 1311, and the axial section of the electrolyte cathode distribution channel 1302 is connected to the chamber 12 via the electrolyte cathode inlet groove 1312. With this arrangement, the electrolyte within chamber 12 enters each electrolyte anode distribution channel 1301 and electrolyte cathode distribution channel 1302 via the radial section, and is then distributed through the axial section to the anode and cathode chambers between each electrode assembly 3 on both sides of the intermediate electrode frame. The electrolyte anode distribution channel 1301 and electrolyte cathode distribution channel 1302 have a simple structure and can be machined through them in a single axial process, facilitating fabrication.

[0068] For example, the cross-section of the axial section perpendicular to the axis of the intermediate plate frame is circular, elliptical, waist-shaped, or polygonal, and the polygon can be specifically triangular, square, etc.; the cross-section of the radial section is circular, elliptical, or polygonal, and the polygon can be specifically triangular, square, etc. Of course, the electrolyte anode distribution channel 1301 and the electrolyte cathode distribution channel 1302 can also have other structural forms, not limited to the forms listed in this embodiment, as long as they can achieve distribution of electrolyte from the chamber 12 to the electrolysis chambers on both sides.

[0069] As shown in Figures 1-3, 7-8, and 9, at least one electrolyte anode distribution channel 1301 and at least one electrolyte cathode distribution channel 1302 are located in the lower portion of the intermediate plate frame. Specifically, they are located in the lower half of the intermediate plate frame. This arrangement allows the electrolyte entering through the electrolyte inlet 11 to be continuously distributed to the lower regions of each anode chamber and cathode chamber, with the electrolyte gradually flowing upward from the lower portion, during which the electrolysis reaction occurs.

[0070] For example, the central angle between the two electrolyte anode distribution channels located at both ends of the at least two electrolyte anode distribution channels 1301 can be 60° to 180°. Similarly, the central angle between the two electrolyte cathode distribution channels located at both ends of the at least two electrolyte cathode distribution channels 1302 can be 60° to 180°, so as to expand the diffusion range of the electrolyte in the anode chamber and the cathode chamber and improve the uniformity of distribution.

[0071] For example, there is at least one hydrogen converging channel 110 and at least one oxygen converging channel 18, specifically one, two, three, four, or more. The number of hydrogen converging channels 110 and oxygen converging channels 18 can be the same or different, and the hydrogen converging channels 110 and oxygen converging channels 18 are located on either side of a vertical diametrical cross-section of the intermediate plate frame, with the vertical diametrical cross-section passing through the axis of the intermediate plate frame. This arrangement facilitates the separate arrangement of the hydrogen pipeline 6 connected to the hydrogen converging channel 110 and the oxygen pipeline 5 connected to the oxygen converging channel 18, preventing interlaced interference between the pipelines.

[0072] Furthermore, in this embodiment, the hydrogen collection channel 110 and the oxygen collection channel 18 each include a radial section and an axial section. The radial section extends through the outer peripheral surface of the intermediate plate frame in the radial direction of the intermediate plate frame, and the axial section extends through the two end surfaces of the intermediate plate frame in the axial direction of the intermediate plate frame, with the radial section and the axial section communicating with each other. The axial section of the oxygen collection channel 18 communicates with the anode chamber. Specifically, the axial section of the oxygen collection channel 18 communicates with the anode chamber via an oxygen guide groove 181 provided on one end surface of the intermediate plate frame near the anode chamber. The axial section of the hydrogen collection channel 110 communicates with the cathode chamber. Specifically, the axial section of the hydrogen collection channel 110 communicates with the cathode chamber via a hydrogen guide groove (not shown in the figure, and disposed opposite to the oxygen guide groove 181 in Figure 6) provided on the other end surface of the intermediate plate frame near the cathode chamber. With this arrangement, the hydrogen collection channel 110 and the oxygen collection channel 18 have a T-shaped flow channel structure, which is simple in structure and can be axially penetrated in one processing step, facilitating manufacturing.

[0073] For example, the cross-section of the axial section perpendicular to the axis of the intermediate plate frame is circular, elliptical, waist-shaped, or polygonal, specifically a triangle or square, etc.; the cross-section of the radial section is circular, elliptical, or polygonal, specifically a triangle or square, etc. Of course, the oxygen collection channel 18 and the hydrogen collection channel 110 can also have other structural forms, not limited to the forms listed in this embodiment, as long as they can respectively collect and drain the gas and liquid in the anode chamber and the cathode chamber.

[0074] As shown in Figures 7 and 10, the remaining plate assemblies 3 located on both sides of the middle bipolar plate assembly in the multiple plate assemblies 3 include at least two bipolar plate assemblies; each bipolar plate assembly includes a bipolar plate, and the two sides of the bipolar plate are respectively an anode side and a cathode side, the anode side is opposite to the anode chamber, and the cathode side is opposite to the cathode chamber; at least one anode flow channel 303, at least one cathode flow channel 304, a hydrogen outlet flow channel 302, and an oxygen outlet flow channel 301 are provided in the bipolar plate assembly, and the anode flow channel 303 and the cathode flow channel 304 are alternately arranged along the circumference of the bipolar plate assembly, and the anode flow channel 303 is connected to the electrolyte anode distribution flow channel 1301 of the middle bipolar plate assembly in a one-to-one correspondence, and the cathode flow channel 304 is connected to the electrolyte cathode distribution flow channel 1302 of the middle bipolar plate assembly in a one-to-one correspondence, the anode flow channel 303 and the oxygen outlet flow channel 301 are both connected to the anode chamber, and the cathode flow channel 304 and the hydrogen outlet flow channel 302 are both connected to the cathode chamber. Specifically, the anode flow channel 303 is connected to the anode chamber through an anode chamber groove 3031 provided on one end face of the electrode frame close to the anode chamber, the cathode flow channel 304 is connected to the cathode chamber through a cathode chamber groove 3041 provided on the other end face of the electrode frame close to the cathode chamber, the oxygen outlet flow channel 301 is connected to the anode chamber through an oxygen groove 3011 provided on one end face of the electrode frame close to the anode chamber, and the hydrogen outlet flow channel 302 is connected to the cathode chamber through a hydrogen groove 3021 provided on one end face of the electrode frame close to the cathode chamber.

[0075] When using the above technical solution, the electrolyte flows from the chamber 12 of the intermediate plate frame. A portion of the electrolyte flows through the electrolyte anode distribution channel 1301 to the anode channel 303 of each bipolar plate, and then enters each anode chamber through the anode channel 303, as shown by the solid arrows in Figure 8. After electrolysis, oxygen is generated. The oxygen flows with the electrolyte into the oxygen outlet channel 301, and finally converges into the oxygen collection channel 18 of the intermediate plate frame, as shown by the dotted arrows in Figure 8, and is discharged to the external oxygen pipeline 5. Another portion of the electrolyte flows through the electrolyte cathode distribution channel 1302 to the cathode channel 304 of each bipolar plate, and then enters each cathode chamber through the cathode channel 304, as shown by the solid arrows in Figure 8. After electrolysis, hydrogen is generated. The hydrogen flows with the electrolyte into the hydrogen outlet channel 302, and finally converges into the hydrogen collection channel 110 of the intermediate plate frame, as shown by the dotted arrows in Figure 8, and is discharged to the external hydrogen pipeline 6. The entire electrolyte distribution flow channel and gas collection flow channel shorten the electrolyte and gas flow paths, improve distribution uniformity, and the electrolytic cell structure is compact.

[0076] Furthermore, in this embodiment, the cross-sectional shape of the axial section of the electrolyte anode distribution channel 1301 is the same as the cross-sectional shape of the anode channel 303, the cross-sectional shape of the axial section of the electrolyte cathode distribution channel 1302 is the same as the cross-sectional shape of the cathode channel 304, the cross-sectional shape of the axial section of the oxygen collection channel 18 is the same as the cross-sectional shape of the oxygen outlet channel 301, and the cross-sectional shape of the axial section of the hydrogen collection channel 110 is the same as the cross-sectional shape of the hydrogen outlet channel 302, so as to reduce the sudden change of the flow cross-section, reduce the adverse effects of cavitation, erosion and other phenomena on each channel, and avoid leakage.

[0077] In some embodiments, the bipolar plate has a thickness of 6-12 mm, preferably 7-11 mm, and specifically 7 mm, 8 mm, 9 mm, 10 mm, or 11 mm. Selecting a bipolar plate thickness less than 10 mm, for example, within the range of 7-10 mm, can further reduce the weight and cost of the electrolyzer.

[0078] In some embodiments, a diaphragm is provided between two adjacent plate assemblies 3 to separate the anode chamber from the cathode chamber, allowing the generated oxygen and hydrogen to be separated and collected separately to improve gas purity. The cathode chamber is composed of the cathode surface of the plate assembly 3, the support mesh, and the cathode electrode mesh, while the anode chamber is composed of the anode surface of the plate assembly 3, the support mesh, and the anode electrode mesh. The cathode and anode surfaces of the bipolar plate are flat. The support mesh is a plate mesh structure that supports the anode and cathode electrode meshes and facilitates current transmission between the plate surface and the electrode meshes. It can be produced by stamping thin steel plates.

[0079] In other embodiments, the cathode chamber is composed of the cathode surface and cathode electrode network of the electrode plate assembly 3, and the anode chamber is composed of the anode surface and anode electrode network of the electrode plate assembly 3. The cathode surface and the anode surface have protrusions, which are used to support the cathode electrode network and the anode electrode network and transmit current, so that the electrode plates on both sides of the diaphragm can form a "top-to-top" form, forming reliable multi-point electrical contact, increasing the electrical contact area, and thus improving the hydrogen production efficiency.

[0080] In some possible implementations, a sealing gasket is further disposed between two adjacent electrode plate assemblies 3. The sealing gasket is positioned between one end of the electrode plate assembly 3 and the diaphragm. A hole is provided on the end face of the electrode frame of the electrode plate assembly 3 to release the compression of the sealing gasket. This arrangement allows the sealing gasket to partially embed within the hole after compression, forming a stopper and preventing the sealing gasket from squeezing out of the electrolytic cell after compression, thereby affecting the sealing performance.

[0081] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0082] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A plate frame, characterized in that: It includes an annular frame, the outer circumferential surface of which is provided with one or more fluid inlets and outlets, and mounting holes are provided around each of the fluid inlets and outlets. The mounting holes are located on the outer circumferential surface of the annular frame, so that each fluid inlet and outlet and the corresponding mounting hole form a flange structure for connecting to an external pipeline.

2. The electrode plate frame according to claim 1, characterized in that: The flange surface of the flange structure is a plane.

3. The plate frame according to claim 1, characterized in that: The outer peripheral surface of the annular frame is provided with a plurality of avoidance notches arranged at intervals along the circumferential direction, and the extending direction of the avoidance notches is parallel to the axis of the annular frame.

4. The plate frame according to claim 1, characterized in that: The plurality of fluid inlets and outlets include a gas outlet and an electrolyte inlet.

5. The electrode plate frame according to claim 4, characterized in that: The electrolyte inlet penetrates the annular frame along the radial direction of the annular frame. The annular frame is also provided with an electrolyte distribution channel. The inlet of the electrolyte distribution channel is opened on the inner circumferential surface of the annular frame, and the outlet of the electrolyte distribution channel is opened on the two end surfaces of the annular frame.

6. The electrode plate frame according to claim 5, characterized in that: The electrolyte distribution flow channels include at least two electrolyte anode distribution flow channels and at least two electrolyte cathode distribution flow channels, and the electrolyte anode distribution flow channels and the electrolyte cathode distribution flow channels are alternately arranged along the circumference of the electrode frame.

7. The electrode plate frame according to claim 6, characterized in that: The central angle between the two electrolyte anode distribution channels located at both ends of the at least two electrolyte anode distribution channels is 60° to 180°, and / or the central angle between the two electrolyte cathode distribution channels located at both ends of the at least two electrolyte cathode distribution channels is 60° to 180°.

8. The electrode plate frame according to claim 4, characterized in that: The gas outlet includes an oxygen outlet and a hydrogen outlet. The oxygen outlet is communicated with an oxygen collecting channel arranged in the annular frame body, and the hydrogen outlet is communicated with a hydrogen collecting channel arranged in the annular frame body.

9. The electrode plate frame according to claim 1, characterized in that: The outer diameter of the annular frame is 2m to 3m, and the radial thickness of the annular frame is 20cm to 30cm.

10. An electrolytic cell comprising two end pressure plates and a plurality of electrode plate assemblies located between the two end pressure plates, wherein an electrolysis chamber is formed between two adjacent electrode plate assemblies, characterized in that: At least one of the plurality of plate assemblies comprises the plate frame according to any one of claims 1 to 9.

11. The electrolytic cell according to claim 10, characterized in that At least one of the plurality of plate assemblies located at both ends includes the plate frame.

12. The electrolytic cell according to claim 11, characterized in that The two electrode plate assemblies at both ends of the plurality of electrode plate assemblies are respectively a positive electrode plate assembly and a negative electrode plate assembly. The positive electrode plate assembly and the negative electrode plate assembly are respectively arranged adjacent to one of the two end pressure plates, and the negative electrode plate assembly includes the electrode plate frame.

13. The electrolytic cell according to claim 11, characterized in that The two electrode plate assemblies at both ends of the plurality of electrode plate assemblies are both negative electrode plate assemblies, the electrode plate assembly in the middle of the plurality of electrode plate assemblies is a positive electrode plate assembly, and the negative electrode plate assembly includes the electrode frame.

14. The electrolytic cell according to claim 10, characterized in that A middle one of the plurality of plate assemblies includes the plate frame.

15. The electrolytic cell according to claim 10, characterized in that The at least one plate assembly including the plate frame further includes two flat plates, which are parallel to each other and fixed at intervals on the edge of the plate frame. The plate frame and the two flat plates form an electrolyte cavity.

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