Polar plate frame and electrolytic bath

Abstract

The utility model discloses a polar plate frame and an electrolytic bath, relates to the technical field of electrolytic hydrogen production, and aims to solve the problem of leakage at the joint of the polar plate frame and an external pipeline. The polar plate frame comprises an annular frame body, one or more fluid inlets and outlets are formed in the peripheral surface of the annular frame body, and mounting holes are formed in the peripheral surface of the annular frame body and located on the periphery of each fluid inlet and outlet, so that each fluid inlet and outlet and the corresponding mounting hole form a flange structure used for being connected with an external pipeline. Compared with the prior art that pipelines are welded at the inlet and the outlet, the fluid inlet and the fluid outlet of the annular frame do not need to be welded, welding points do not exist, stress corrosion is avoided, and the phenomenon that a primary battery is corroded due to the fact that welding materials are different from the materials of the pipelines and the polar plate frame is avoided; and the leakage risk at the joint of the polar plate frame and the external pipeline is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic hydrogen production, in particular to a polar plate frame and an electrolytic cell. Background Art

[0002] The hydrogen production equipment in the prior art is usually a filter press type bipolar electrolyzer, which includes end pressure plates on both sides and multiple bipolar plates in the middle. An electrolyte inlet and a gas outlet are set on one end pressure plate. The electrolyte inlet is connected to an external electrolyte supply pipeline for introducing electrolyte into the electrolyzer, and the gas outlet is connected to an external gas pipeline for exporting the gas generated after electrolysis. The prior art usually welds pipelines at the electrolyte inlet and gas outlet to facilitate external pipeline connection. Due to residual stress caused by pipeline welding, the anti-corrosion coating at the electrolyte inlet and gas outlet is easy to fall off. Combined with cavitation, erosion and stress corrosion inside the electrolyte inlet and gas outlet, leakage problems are very likely to occur at the weld. Utility Model Content

[0003] The utility model aims to provide an electrode plate frame and an electrolytic cell to reduce the risk of leakage at the connection between the electrode plate frame and an external pipeline.

[0004] In the first aspect, the utility model 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 the outer peripheral surface of the annular frame body is provided with mounting holes at positions around each fluid inlet and outlet, so that each fluid inlet and outlet and the corresponding mounting hole form a flange structure for connecting to an external pipeline.

[0005] When the above technical solution is adopted, mounting holes are directly opened on the outer peripheral surface of the annular frame at the positions around the fluid inlet and outlet, and a flange structure is directly formed integrally on the annular frame, and the fluid inlet and outlet are connected to the external pipeline through the flange structure. Compared with the existing welding pipeline at the inlet and outlet, the fluid inlet and outlet of the annular frame of the present application do not need to be welded, there are no welding points, stress corrosion is avoided, and there is no galvanic cell corrosion caused by the different materials of the welding material, pipeline and plate frame, which will only occur during welding, and the leakage risk at the connection between the plate frame and the external pipeline is reduced.

[0006] In some possible implementations, the flange surface of the flange structure is a plane. In this way, during manufacturing, the circumferential surface of the annular frame can be cut corresponding to the surface of the flange structure to obtain a plane flange surface, so that the flange structure and the flange of the external pipeline are more closely and firmly contacted, further reducing the risk of leakage at the connection between the plate frame and the external pipeline.

[0007] In some possible implementations, the outer circumferential surface of the annular frame is provided with a plurality of avoidance gaps arranged at intervals along the circumferential direction, the extension direction of the avoidance gaps is parallel to the axis of the annular frame, and the avoidance gaps are used to accommodate the tension bolts of the avoidance electrolytic cell. Since it is necessary to radially open mounting holes on the annular frame, in order to make the mounting holes have an effective connection depth and to prevent the mounting holes from penetrating the flow channel in the annular frame, the annular frame needs to increase the radial thickness, and accordingly, the outer diameter of the annular frame needs to be increased. In order not to increase the circumferential diameter of the tension bolts and the diameter of the end pressure plate, and not to increase the production cost, avoidance gaps are set on the outer circumferential surface of the annular frame in the area that interferes with the tension bolts.

[0008] In some possible implementations, the plurality of fluid inlets and outlets include a gas outlet and / or an electrolyte inlet. Thus, the gas outlet and / or electrolyte inlet on the annular frame plate for connecting to an external pipeline can be configured as a flange structure to reduce the risk of leakage at the connection between the plate frame and the external pipeline.

[0009] In some possible implementations, the electrolyte inlet penetrates the annular frame along the radial direction of the annular frame, and the annular frame is also provided with an electrolyte distribution channel, the inlet of the electrolyte distribution channel is opened on the inner peripheral surface of the annular frame, and the outlet of the electrolyte distribution channel is opened on the two 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, and distributes the electrolyte to each electrolytic chamber located on both sides of the plate frame through the electrolyte distribution channel. The electrolyte entry and distribution method enables the electrolyte to be quickly and evenly replenished to each electrolytic chamber, reducing the concentration polarization phenomenon during the electrolysis process, reducing the energy consumption of the electrolytic cell, and laying a foundation for increasing the current density.

[0010] In some possible implementations, the electrolyte distribution channel is a T-shaped channel structure. In this way, the T-shaped channel structure has a radial section and an axial section that are vertically connected to each other, and the electrolyte first enters the radial section of the T-shaped channel structure along the radial direction of the annular frame, and then enters the axial section to distribute the electrolyte to both sides. The structure of the electrolyte distribution channel is simple and convenient for processing and manufacturing.

[0011] In some possible implementations, the gas outlet includes an oxygen outlet and a hydrogen outlet, the oxygen outlet is communicated with an oxygen flow channel disposed in the annular frame, and the hydrogen outlet is communicated with a hydrogen flow channel disposed in the annular frame. In this way, the mixed fluid of oxygen and electrolyte collected in the oxygen flow channel is discharged from the electrolytic cell through the oxygen outlet, and the mixed fluid of hydrogen and electrolyte collected in the hydrogen flow channel is discharged from the electrolytic cell through the hydrogen outlet, so as to be separated and discharged, thereby improving the purity of the prepared gas.

[0012] In some possible implementations, the outer diameter of the annular frame is 2m to 3m, and the radial width of the annular frame is 20cm to 30cm. The outer diameter of the annular frame is relatively large, belonging to a large electrolytic cell, and the radial width of the annular frame can meet the depth requirements of the mounting hole and improve the connection strength with the external pipeline.

[0013] In a second aspect, the utility model also provides an electrolytic cell, comprising two end pressure plates and a plurality of electrode plate assemblies located between the two end pressure plates, an electrolysis chamber is formed between two adjacent electrode plate assemblies, and at least one of the plurality of electrode plate assemblies comprises a electrode plate frame as described in any of the above items.

[0014] 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.

[0015] In some possible implementations, at least one of the plurality of plate assemblies located at both ends includes the plate frame described in the first aspect. In this way, the location where the electrolytic cell is connected to the external pipeline is located on the plate frame of the plate assembly at the end of the electrolytic cell, the electrolyte is introduced from one end of the electrolytic cell, and then introduced to each electrolysis chamber from the other end, and accordingly, the gas generated by electrolysis is also discharged from the plate frame of the plate assembly located at the end of the electrolytic cell.

[0016] In some possible implementations, two of the multiple plate assemblies located at the two ends are respectively a positive plate assembly and a negative plate assembly, the positive plate assembly and the negative plate assembly are respectively arranged adjacent to the two end pressure plates, and the negative plate assembly includes the above-mentioned plate frame. In this way, the position where the electrolytic cell is connected to the external pipeline is located on the plate frame of the negative plate assembly at one end of the electrolytic cell, the electrolyte is introduced from the negative plate assembly, and then flows in the direction of the positive plate assembly, during which the electrolyte is introduced into each electrolysis chamber, and accordingly, 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.

[0017] In some possible implementations, two of the multiple plate assemblies located at both ends are negative plate assemblies, and one of the multiple plate assemblies located in the middle is a positive plate assembly, and the negative plate assembly includes the above-mentioned plate frame. In this way, the positions where the electrolytic cell is connected to the external pipeline are both located on the plate frames of the negative plate assemblies at both ends of the electrolytic cell, and the electrolyte is introduced from the negative plate assemblies at both ends of the electrolytic cell, and then flows to the middle to each electrolytic chamber, and accordingly, the gas generated by electrolysis is also discharged from the plate frames of the negative plate assemblies located at both ends of the electrolytic cell.

[0018] In some possible implementations, a middle plate assembly among the plurality of plate assemblies includes the plate frame. In this way, the location where the electrolytic cell is connected to the external pipeline is located on the plate frame of the plate assembly 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 from both ends, and accordingly, the gas generated by electrolysis is also discharged from the plate frame of the plate assembly in the middle of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of a plate frame provided by an embodiment of the utility model;

[0021] Figure 2 A partially enlarged schematic diagram of a plate frame provided in an embodiment of the utility model;

[0022] Figure 3 A schematic front view of a plate frame provided in an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of an electrolytic cell provided in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the structure of another electrolytic cell provided in an embodiment of the utility model;

[0025] Figure 6 A schematic structural diagram of another electrolytic cell provided in an embodiment of the utility model.

[0026] Figure numerals: 1 is an annular frame, 11 is an electrolyte inlet, 12 is a chamber, 13 is an electrolyte distribution channel, 131 is an electrolyte inlet groove, 14 is an avoidance gap, 15 is a flange surface, 16 is a mounting hole, 17 is an oxygen outlet, 18 is an oxygen flow channel, 181 is a guide groove, 19 is a hydrogen outlet, 110 is a hydrogen flow channel, 2 is an end pressure plate, 3 is a plate assembly, and 5 is a tightening bolt. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can 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 can be directly connected to the other element or indirectly connected to the other element.

[0029] 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 indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] See also Figure 1-Figure 3 The embodiment of the utility model provides a plate frame, including an annular frame body 1, wherein the outer peripheral surface of the annular frame body 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; the outer peripheral surface of the annular frame body 1 is provided with mounting holes 16 at positions around 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, and the number corresponds to the number of connection holes of the flange of the external pipeline.

[0033] In the case of adopting the above technical solution, since the mounting holes 16 are directly opened on the outer peripheral surface of the annular frame 1 at the positions around the fluid inlet and outlet, a flange structure is directly formed integrally 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 welding pipeline at the inlet and outlet, the fluid inlet and outlet of the annular frame 1 of the present application does not need to be welded, there is no welding point, there is no residual stress caused by welding, stress corrosion is avoided, and there is no galvanic cell corrosion caused by the different materials of the welding material, pipeline and plate frame that only occurs during welding, reducing the risk of leakage at the connection between the plate frame and the external pipeline.

[0034] Furthermore, in some embodiments, the flange surface 15 of the flange structure is a plane. Thus, during manufacturing, the circumferential surface of the annular frame 1 can be cut corresponding to the surface of the flange structure to obtain a plane flange surface 15, so that the flange structure and the flange of the external pipeline are more closely and firmly contacted, 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 be retained as the arc surface of the annular frame 1, without cutting, and the flange of the external pipeline that closely matches the arc surface is selected.

[0035] like Figure 1-Figure 3 As shown, in some embodiments, the outer circumferential surface of the annular frame 1 is provided with a plurality of avoidance gaps 14 arranged at intervals along the circumferential direction, and the extension direction of the avoidance gaps 14 is parallel to the axis of the annular frame 1, and the avoidance gaps 14 are used to accommodate the tension bolts 5 of the avoidance electrolyzer. Among them, the cross-section of the avoidance gap 14 can be an arc gap, a rectangular gap or a trapezoidal gap, as long as it can accommodate the avoidance tension bolts 5. The number of the avoidance gaps 14 is the same as the number of the tension bolts 5 and the arrangement positions on the circumference correspond one to one. Since it is necessary to radially open the mounting hole 16 on the annular frame 1, in order to make the mounting hole 16 have an effective connection depth, and to prevent the mounting hole 16 from penetrating the flow channel in the annular frame 1, such as the hydrogen flow channel, the oxygen flow channel, etc., therefore, the annular frame 1 needs to increase the radial thickness, and without reducing the internal space of the electrolyzer, that is, without reducing the inner diameter of the annular frame 1, the outer diameter of the annular frame 1 needs to be increased accordingly. Conventionally, when the outer diameter of the annular frame 1 increases, the circumferential diameter of the tension bolts 5 needs to be increased accordingly. Accordingly, in order to fix the two ends of the tension bolts 5, the diameter of the end pressure plate 2 also needs to be increased, but this will increase the material cost. Therefore, in order not to increase the production cost, the present application chooses to set the avoidance gap 14 in the area on the outer circumferential surface of the annular frame 1 that interferes with the tension bolts 5 without increasing the circumferential diameter of the tension bolts 5 and the diameter of the end pressure plate 2.

[0036] like Figure 1 and Figure 3As shown, 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 the electrolyte inlet 11 on the annular frame 1 for connecting to the external pipeline can be set as a flange structure to reduce the risk of leakage at the connection between the plate frame and the external pipeline.

[0037] like Figure 1 and Figure 3 As shown, 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 peripheral 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. In this way, the electrolyte enters the chamber 12 within the inner circle 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 electrolytic 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 electrolytic chamber, reduce the concentration polarization phenomenon during the electrolysis process, reduce the energy consumption of the electrolytic cell, and lay a foundation for improving the current density.

[0038] Further, the electrolyte distribution flow channel 13 is a T-type flow channel structure. In this way, 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, and the two ends of the radial section are respectively connected with the chamber and the axial section, and 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 the electrolyte to both sides. The structure of the electrolyte distribution flow channel is simple and convenient for processing and manufacturing. The cross section of the radial section can be circular, elliptical, square, triangular, etc., and the cross section of the axial section can be waist-shaped, circular, elliptical, square, triangular, etc. Of course, the electrolyte distribution flow channel 13 can also have other structural forms, and is not limited to the form listed in the present embodiment, as long as it can be achieved that the electrolyte is distributed to the electrolysis chambers on both sides from the chamber 12.

[0039] like Figure 1 and Figure 3As shown, the gas outlet includes an oxygen outlet 17 and a hydrogen outlet 19, the oxygen outlet 17 is communicated with an oxygen flow channel 18 arranged in the annular frame 1, and the hydrogen outlet 19 is communicated with a hydrogen flow channel 110 arranged in the annular frame 1. The oxygen flow channel 18 and the hydrogen flow channel 110 are arranged at the upper part of the annular frame 1, and the oxygen flow channel 18 and the hydrogen flow channel 110 both penetrate the two end faces of the annular frame 1 along the axial direction of the annular frame 1, and the oxygen flow channel 18 is communicated with the anode chamber through a guide groove 181 arranged on an end face of the annular frame 1 close to the anode chamber, and the hydrogen flow channel 110 is communicated with the cathode chamber through a guide groove arranged on a section of the annular frame 1 close to the cathode chamber. Wherein, the cross-sectional shape of the oxygen flow channel 18 and the hydrogen flow channel 110 can be waist-shaped, circular, elliptical, square or triangular, etc. The mixed fluid of oxygen and electrolyte collected in the oxygen flow 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 flow channel 110 is discharged into the external hydrogen pipeline through the hydrogen outlet 19, so as to separately extract oxygen and hydrogen and improve the purity of the prepared gas.

[0040] In some possible implementations, the outer diameter of the annular frame 1 is 2m to 3m, and the radial width of the annular frame 1 is 20cm to 30cm. The annular frame 1 has a large outer diameter and belongs to a large electrolytic cell. The radial width of the annular frame 1 can meet the depth requirement of the mounting hole 16 and improve the connection strength with the external pipeline.

[0041] like Figure 4-Figure 6 As shown, the utility model based on any of the above embodiments further provides an electrolytic cell, which includes two end pressure plates 2 and a plurality of pole plate assemblies 3 located between the two end pressure plates 2, each pole plate assembly 3 includes a pole plate frame and a pole plate fixed in the pole plate frame, and a clamping force is applied to the end pressure plates 2 at both ends by tightening bolts 5, so that the plurality of pole plate assemblies 3 are pressed and sealed against each other, and an electrolytic chamber is formed between two adjacent pole plate assemblies 3, wherein at least one of the pole plate assemblies 3 adopts the pole plate frame described in any of the above embodiments.

[0042] Since the plate frame of the plate assembly 3 in the electrolytic cell connected to the external pipeline adopts the plate frame described in any of the above embodiments, no welding is required at the fluid inlet and outlet, there is no welding point, no residual stress caused by welding, stress corrosion is avoided, and there is no galvanic cell corrosion caused by the difference in materials between the welding material and the pipeline and the plate frame, which only occurs during welding, thereby reducing the risk of leakage at the connection between the plate frame and the external pipeline.

[0043] like Figure 4 and Figure 5As shown, the plate frame of at least one plate assembly 3 located at both ends of the plurality of plate assemblies 3 between the two end pressure plates 2 adopts the plate frame described in any of the above embodiments. That is, the external pipelines are all connected to at least one plate assembly 3 located at the end of the electrolytic cell. In this way, the position where the electrolytic cell is connected to the external pipeline is located on the plate frame of the plate assembly 3 at the end of the electrolytic cell, and the electrolyte is introduced from one end of the electrolytic cell and then introduced to each electrolytic chamber from the other end. Correspondingly, 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.

[0044] For example, Figure 5 As shown, two of the multiple plate assemblies 3 between the two end pressure plates 2 are located at the two ends of the plate assemblies 3, respectively, the positive plate assembly includes a positive plate and a plate frame, the negative plate assembly includes a negative plate and a plate frame, and the remaining plate assemblies 3 are bipolar plate assemblies, the positive plate assembly is arranged adjacent to the end pressure plate 2 at one end, the negative plate assembly is arranged adjacent to the end pressure plate at the other end, the bipolar plate assembly is located between the positive plate assembly and the negative plate assembly, and an electrolytic chamber is formed between the positive plate assembly and an adjacent bipolar plate assembly, between two adjacent bipolar plate assemblies, and between the negative plate assembly and an adjacent bipolar plate assembly, and an anode chamber and a cathode chamber are formed on both sides of the bipolar plate assembly, respectively, an anode chamber is formed on one side of the positive plate assembly, and a cathode chamber is formed on one side of the negative plate assembly, and a structure in which anode chambers and cathode chambers are alternately arranged is formed in the electrolytic cell. Among them, the plate frame of the positive plate assembly located at one end adopts the plate frame described in any of the above embodiments.

[0045] In this way, the location where the electrolytic cell is connected to the external pipeline is set on the plate frame of the positive plate assembly located at one end of the electrolytic cell. The electrolyte flows from the positive plate assembly into its chamber 12, and then flows in the direction of the negative plate assembly. During this process, the electrolyte flows into each electrolytic chamber, and accordingly, the gas generated by electrolysis is also discharged from the plate frame of the positive plate assembly located at the end of the electrolytic cell.

[0046] In another example, if Figure 4 As shown, the two electrode plate assemblies 3 at the two ends of the multiple electrode plate assemblies 3 between the two end pressure plates 2 are both negative electrode plate assemblies, and the negative electrode plate assembly includes a negative electrode plate and an electrode plate frame. The electrode plate assembly 3 located in the middle is a positive electrode plate assembly, and the remaining electrode plate assemblies are all bipolar plate assemblies, wherein one negative electrode plate assembly 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. Among them, the electrode plate frames of the two negative electrode plate assemblies located at the two ends adopt the electrode plate frames described in any of the above embodiments.

[0047] In this way, the electrolyte enters the respective chambers 12 from the negative plate assemblies at both ends, and then flows from the two ends to the positive plate assembly in the middle. In this process, the electrolyte enters 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. With this arrangement, for a large electrolytic cell with a long length, the electrolyte can be distributed from both ends to the middle at the same time, which can increase the distribution speed and uniformity of the electrolyte and improve the electrolysis efficiency.

[0048] like Figure 6 As shown, 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 position 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, and 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 extracted from the plate frame of the plate assembly 3 located in the middle of the electrolytic cell. With this arrangement, for a large electrolytic cell 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.

[0049] For example, Figure 6 As shown, the two plate assemblies 3 at the two ends of the multiple plate assemblies 3 between the two end pressure plates 2 are both negative plate assemblies, the one plate assembly in the middle of the multiple plate assemblies 3 is a positive plate assembly, and the remaining plate assemblies 3 are all bipolar plate assemblies, wherein the plate frame of the positive plate assembly 3 in the middle adopts the plate frame described in any of the above embodiments. In this way, the position where the electrolytic cell is connected to the external pipeline is set on the plate frame of the positive plate assembly in the middle of the electrolytic cell, and the electrolyte is introduced from the middle positive plate assembly of the electrolytic cell, and then introduced to each electrolysis chamber at both ends, and accordingly, the gas generated by electrolysis is also discharged from the plate frame of the bipolar plate assembly in the middle of the electrolytic cell.

[0050] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0051] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

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

2. The 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 gaps arranged at intervals along the circumferential direction, the extension direction of the avoidance gaps is parallel to the axis of the annular frame, and the avoidance gaps are used to accommodate the tensioning bolts of the avoidance electrolytic cell.

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

5. The 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 plate frame according to claim 5, characterized in that: The electrolyte distribution channel is a T-shaped channel structure.

7. The plate frame according to claim 4, characterized in that: The gas outlet comprises an oxygen outlet and a hydrogen outlet. The oxygen outlet is communicated with an oxygen flow channel arranged in the annular frame, and the hydrogen outlet is communicated with a hydrogen flow channel arranged in the annular frame.

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

9. An electrolytic cell, comprising two end pressure plates and a plurality of plate assemblies located between the two end pressure plates, wherein an electrolytic chamber is formed between two adjacent plate assemblies, characterized in that: At least one of the plurality of plate assemblies comprises a plate frame as claimed in any one of claims 1 to 8.

10. The electrolytic cell according to claim 9, characterized in that At least one of the plurality of plate assemblies located at both ends includes the plate frame.

11. The electrolytic cell according to claim 10, characterized in that Two of the plurality of electrode plate assemblies located at the two ends 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 disposed adjacent to the two end pressure plates, and the negative electrode plate assembly includes the electrode plate frame.

12. The electrolytic cell according to claim 10, characterized in that Two of the plurality of electrode plate assemblies located at both ends are negative electrode plate assemblies, one of the plurality of electrode plate assemblies located in the middle is a positive electrode plate assembly, and the negative electrode plate assembly includes the electrode frame.

13. The electrolytic cell according to claim 9, characterized in that A middle one of the plurality of plate assemblies includes the plate frame.

14. The electrolytic cell according to claim 13, characterized in that Two of the plurality of electrode plate assemblies located at the two ends are respectively a positive electrode plate assembly and a negative electrode plate assembly, and the positive electrode plate assembly and the negative electrode plate assembly are respectively disposed adjacent to the two end pressure plates.

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