Electrolytic bath pole plate and electrolytic bath device

Abstract

The utility model provides an electrolytic bath pole plate and an electrolytic bath device, and relates to the technical field of water electrolysis hydrogen production. The electrolytic cell polar plate comprises a polar plate, one or two polar frames and an electrolytic cell assembly, one polar plate is arranged on one side of the polar plate, a through opening is formed in the center of each polar frame, a limiting groove which is sunken from the through opening to the direction away from the through opening is formed in the side, away from the polar plate, of each polar frame, and the electrolytic assembly is arranged in the through opening of the corresponding polar frame. Each group of electrolysis assembly comprises a titanium felt and a titanium mesh located between the pole plate and the titanium felt, the titanium mesh is arranged to be spaced from the pole frame by a first preset distance, and the titanium felt is arranged to convexly extend towards the limiting groove from the edge of the titanium mesh, so that the titanium felt and the pole frame are matched and connected to isolate the pole plate and the membrane electrode. The electrolytic bath polar plate has stronger sealing performance and protective performance, and can prevent the membrane electrode from being damaged to cause deformation.

Description

TECHNICAL FIELD

[0001] The utility model discloses the electrolytic water hydrogen production technical field, and specifically relates to a kind of electrolytic cell pole plate and electrolytic cell device. BACKGROUND

[0002] Hydrogen energy is a kind of clean pollution-free, long-term storage secondary energy, hydrogen energy will play a pivotal role in the renewable energy dominant energy system under the background of carbon peak and carbon neutral. Green hydrogen is obtained by electrolyzing water, that is, under the action of direct current, water molecules are decomposed into hydrogen and oxygen by electrochemical process, and are precipitated at cathode and anode respectively. At present, electrolytic water hydrogen production mainly includes the following four technical routes: alkaline electrolysis hydrogen production, proton exchange membrane electrolysis, anion exchange membrane electrolysis and solid oxide electrolysis hydrogen production. Among them, the proton exchange membrane electrolysis water hydrogen production has the advantages of simple design, compact structure, small size, rapid reaction and high current density. With the updating of product technology, the cost is gradually reduced, and it has a broad market prospect in the future hydrogen production field. The anion exchange membrane electrolysis water hydrogen production technology combines the advantages of alkaline electrolysis water technology and proton exchange membrane electrolysis water hydrogen production technology, has faster response speed and higher current density, and has lower manufacturing cost.

[0003] In the electrolytic water hydrogen production device, the electrolytic cell pole plate formed by welding titanium felt and titanium mesh on both sides of the titanium pole plate is the key component for generating hydrogen and oxygen by electrolyzing water molecules. In the prior art, the gap fit is adopted between the pole frame and the titanium felt and the titanium mesh to install the pole frame on both sides of the titanium pole plate to prevent the titanium pole plate from moving or deforming, and to guide the current through the water solution and the sealed electrolytic cell. However, due to the different materials at the joint of the gap fit, a gap is formed, which easily causes the thin and light parts such as membrane electrode and sealing gasket to deform or embed into the gap under the action of gas pressure. Under the long-term action, the membrane electrode is severely deformed or even damaged, which causes water vapor leakage, performance degradation or even loss of the electrolytic cell pole plate, and seriously affects the service life of the electrolytic cell. UTILITY MODEL CONTENTS

[0004] One object of the first aspect of the utility model is to provide an electrolytic cell pole plate to solve the technical problem that the gap between the pole frame and the titanium felt and the titanium mesh in the electrolytic cell in the prior art easily causes the membrane electrode to deform.

[0005] Another object of the first aspect of the utility model is to improve the structural stability of the electrolytic cell pole plate.

[0006] The object of the second aspect of the utility model is to provide an electrolytic cell device comprising the above-mentioned electrolytic cell pole plate.

[0007] According to the object of the first aspect of the utility model, the utility model provides an electrolytic cell pole plate, which comprises:

[0008] a polar plate;

[0009] one or two polar frames, one of the sides of the polar plate is provided with one of the polar frames, and a through hole is arranged at the center of each of the polar frames, and a limiting groove recessed away from the through hole is arranged at the side of each of the polar frames away from the polar plate;

[0010] at least one set of electrolytic components corresponding to the polar frames, the electrolytic components are arranged in the through hole corresponding to the polar frame, each set of the electrolytic components comprises a titanium felt and a titanium mesh between the polar plate and the titanium felt, the peripheral side of the titanium mesh is arranged at a first preset distance from the inner wall of the through hole, and the peripheral side of the titanium felt protrudes into the limiting groove, so that the titanium felt and the polar frame are connected to isolate the polar plate and the membrane electrode.

[0011] Optionally, the titanium felt comprises a protruding part protruding into the limiting groove, and the width of the protruding part is any value in the range of 0.5mm-2mm.

[0012] Optionally, d<the first preset distance<2d, wherein d is the width of the protruding part.

[0013] Optionally, the material of the polar plate and the polar frame is titanium.

[0014] Optionally, the connection mode between the titanium mesh and the polar plate is any one of sintering, laser welding or resistance welding.

[0015] Optionally, the connection mode between the titanium mesh and the titanium felt is any one of sintering, laser welding or resistance welding.

[0016] Optionally, the polar frame is provided with a plurality of first positioning holes distributed at intervals, the titanium felt is provided with a second positioning hole corresponding to each of the first positioning holes, and the first positioning hole and the second positioning hole are connected through a positioning pin.

[0017] Optionally, the number of the polar frames is two, and the number of the electrolytic components is two.

[0018] According to the second aspect of the utility model, the utility model also provides an electrolytic cell device, comprising the electrolytic cell polar plate of any one of the above, and the electrolytic cell device further comprises:

[0019] at least one membrane electrode arranged on the side of the electrolytic cell polar plate, and the membrane electrode is arranged at intervals from the electrolytic cell polar plate;

[0020] at least two first sealing gaskets corresponding to the membrane electrode are arranged on both sides corresponding to the membrane electrode.

[0021] At least one second sealing gasket is positioned between the electrolytic cell plate and the titanium mesh.

[0022] Optionally, the number of electrolytic cell plates is multiple, and the number of membrane electrodes is multiple.

[0023] The utility model discloses a titanium felt and titanium mesh are set up at the through -going mouth of pole frame, and the titanium mesh is set up into with pole frame circle edge interval preset distance, and the titanium felt is set up into along the extension direction of pole frame and is protruding to limit the recess, to protrude to the limit space formed by titanium felt and titanium mesh with the mode of dislocation of pole frame, make titanium felt and pole frame cooperation installation to completely cover the gap between pole frame and titanium mesh and between pole frame and electrolytic cell plate, avoid the nakedness of titanium mesh, titanium felt edge, thereby prevent membrane electrode from being damaged to cause the damage in the gap by air pressure impact, improve the protection ability of pole frame and titanium felt, further improve the service life of electrolytic cell device.

[0024] Further, the connection mode between the titanium mesh and the electrolytic cell plate and the titanium felt is any one of sintering, laser welding or resistance welding, which can provide strong mechanical strength, ensure long-term stable operation of the titanium mesh, the titanium felt and the electrolytic cell plate in the electrolytic cell, and since the titanium material itself has excellent corrosion resistance, the connection mode does not significantly affect the surface protective layer, thereby maintaining good corrosion resistance and improving the structural stability of the electrolytic cell plate.

[0025] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following detailed description of the preferred embodiments of the utility model and the accompanying drawings as follows. BRIEF DESCRIPTION OF DRAWINGS

[0026] Some specific embodiments of the utility model will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference signs in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0027] Figure 1 is a schematic sectional view of an electrolytic cell plate according to an embodiment of the utility model;

[0028] Figure 2 is a schematic structural view of an electrolytic cell plate according to an embodiment of the utility model;

[0029] Figure 3 is a schematic installation view of a titanium felt, a titanium mesh and a pole frame according to an embodiment of the utility model;

[0030] Figure 4is a schematic sectional view of the electrolytic cell polar plate according to another embodiment of the present application.

[0031] Reference signs:

[0032] 100-electrolytic cell polar plate, 10-polar plate, 20-polar frame, 21-through hole, 22-limiting groove, 30-electrolytic assembly, 31-titanium felt, 32-titanium mesh, 311-protruding part, 23-first positioning hole, 322-second positioning hole, 40-protection frame. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0034] To make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in conjunction with the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings, not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0035] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0036] In this paper, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] Figure 1 is a schematic sectional view of the electrolytic cell polar plate according to one embodiment of the present application, Figure 2 is a schematic structural view of the electrolytic cell polar plate according to one embodiment of the present application, Figure 3 is a schematic installation view of the titanium felt, titanium mesh and polar frame according to one embodiment of the present application, Figure 4is a schematic cross-sectional view of an electrolytic cell polar plate according to another embodiment of the utility model.

[0038] As Figure 1 shown, the utility model provides a kind of electrolytic cell polar plate 100, and electrolytic cell polar plate 100 includes polar plate 10, one or two polar frame 20 and at least one set of electrolytic component 30 corresponding to polar frame 20 one by one is arranged.The one side of polar plate 10 is provided with one polar frame 20, and the center of each polar frame 20 is equipped with through hole 21 (with reference to Figure 2 ), the side of each polar frame 20 away from polar plate 10 is equipped with from through hole 21 to the limit recess 22 recessed away from through hole 21, and at least one set of electrolytic component 30 corresponding to polar frame 20 one by one is arranged, electrolytic component 30 is arranged in the through hole 21 of corresponding polar frame 20, and each set of electrolytic component 30 includes titanium felt 31 and titanium mesh 32 between polar plate 10 and titanium felt 31, and the periphery of titanium mesh 32 is arranged to be spaced apart from the inner wall of through hole 21 polar frame 20 first preset distance, and the periphery of titanium felt 31 is protruded into limit recess 22, so that titanium felt 31 and polar frame 20 are connected to isolate polar plate 10 and membrane electrode.Here, the number of electrolytic component 30 in each electrolytic cell polar plate 100 can be one or more.

[0039] In the embodiment, by setting titanium felt 31 and titanium mesh 32 at the through hole 21 of polar frame 20, and setting titanium mesh 32 to be spaced apart from the round edge of polar frame 20 by preset distance, and setting titanium felt 31 to be protruded towards limit recess 22 along the extension direction of polar frame 20, polar frame 20 is protruded into the limit space formed by titanium felt 31 and titanium mesh 32 in the form of misregistration clamping, so that titanium felt 31 and polar frame 20 are installed to completely cover the gap between polar frame 20 and titanium mesh 32 and between polar frame 20 and polar plate 10, to avoid the exposure of the edge of titanium mesh 32 and titanium felt 31, thereby preventing the damage of membrane electrode caused by air pressure impact into the gap, improving the protection capability of polar frame 20 and titanium felt 31, and further improving the service life of electrolytic cell device.

[0040] As Figure 1 shown, further one embodiment, titanium felt 31 includes protruding part 311 (with reference to Figure 3), the width of the protruding part 311 is any value within the range of 0.5mm-2mm, i.e. the width of the protruding part 311 is 0.5mm, 1.0mm, 1.5mm or 2.0mm, or any value within the range of 0.5mm-2mm. In this embodiment, by setting the width of the titanium felt 31 protruding from the edge of the titanium mesh 32 towards the limiting groove 22 within the above range, when the titanium felt 31 is installed in cooperation with the polar frame 20, the titanium felt 31 can completely cover the gap between the polar frame 20 and the titanium mesh 32 around the periphery, thereby covering the gap in the core area of the polar plate 10, effectively avoiding the exposure of the edges of the titanium mesh 32 and the titanium felt 31, and further preventing the damage of the membrane electrode caused by the air pressure impact into the gap between the titanium felt 31 and the polar frame 20, thereby achieving the protection purpose.

[0041] In a further embodiment, d<first preset distance<2d, wherein d is the width of the protruding part, i.e. the distance between the edge of the titanium mesh 32 and the edge of the through hole 21 of the polar frame 20 can be 1.1d, 1.2d, 1.3d, 1.4d, 1.5d, 1.6d, 1.7d, 1.8d or 1.9d, or any value within the range of d to 2d. By setting the distance between the edge of the titanium mesh 32 and the polar frame 20 within the above range, it is ensured that the current is uniformly distributed inside the electrolytic cell, which also helps to avoid local overheating or overcurrent in the electrolytic cell, and ensures the electrolysis efficiency. In addition, since the titanium mesh 32 and the polar frame 20 in the electrolytic cell are generally composed of different materials and different potentials, if they are too close or in direct contact, it will cause electrical short circuit or abnormal electrical interference, thereby avoiding short circuit or unnecessary current leakage.

[0042] In this embodiment, if the first preset distance is greater than 2d, i.e. the distance between the edge of the titanium mesh 32 and the through hole 21 of the polar frame 20 is greater than 2 times the width of the protruding part, a hollow structure is easily formed between the polar frame 20 and the polar plate 10, which reduces the sealing performance between the polar plate 10 and the membrane electrode, and increases the risk of damage to the membrane electrode. If the second preset distance is less than 0.5mm, i.e. the width of the titanium felt 31 protruding towards the limiting groove 22 is too small, it will result in a small misalignment space between the titanium felt 31 and the titanium mesh 32, which cannot effectively connect the polar frame 20 and the titanium felt 31 in cooperation by misalignment clamping, i.e. cannot achieve the sealing effect of further isolating the membrane electrode and the substrate.

[0043] In a further embodiment, the material of the polar plate 10 and the polar frame 20 is titanium. In this embodiment, due to the high temperature, high humidity, high potential difference and strong acidity of the reaction environment of the electrolytic cell for hydrogen production, a dense passivation oxide film will be formed on the surface of the titanium material, which can effectively resist oxidation and corrosion, thereby prolonging the service life of the electrolytic cell assembly, ensuring the durability and stability of the polar plate 10 and the polar frame 20 in the long-term working environment, and reducing equipment failure or performance degradation caused by corrosion. In addition, the use of titanium material for the polar plate 10 and the polar frame 20 can achieve a good balance between electrical conductivity and corrosion resistance, thereby improving the electrolysis efficiency and reducing energy consumption, and also providing sufficient mechanical strength and maintaining the lightweight of the electrolytic cell device, improving the mechanical stability of the device, and facilitating assembly and maintenance.

[0044] In other embodiments, the material of the polar plate 10 and the polar frame 20 can be nickel, and the material of the titanium felt 31 and the titanium mesh 32 can also be nickel, i.e. nickel felt and nickel mesh. By using a nickel polar plate 10 with a nickel mesh, a nickel felt, or a nickel polar plate 10 directly with a nickel felt, the same sealing and protection effect can be achieved.

[0045] In a further embodiment, the connection between the titanium mesh 32 and the polar plate 10 is any one of sintering, laser welding or resistance welding, and the connection between the titanium mesh 32 and the titanium felt 31 is any one of sintering, laser welding or resistance welding. In this embodiment, any one of the sintering, laser welding or resistance welding connection methods can provide strong mechanical strength, ensuring stable connection between the titanium mesh 32, the titanium felt 31 and the polar plate 10, ensuring that the electrolytic cell polar plate 100 can work stably in the electrolytic cell for a long time. In addition, due to the excellent corrosion resistance of titanium material itself, the connection method will not significantly affect the surface protective layer, thereby maintaining good corrosion resistance and improving the structural stability of the electrolytic cell polar plate 100. In addition, these connection methods can ensure the thermal stability of the assembly during the operation of the electrolytic cell, reduce damage or failure of the connection part caused by temperature fluctuations, and can optimize the working efficiency of the electrolytic cell while ensuring the connection strength, reduce energy loss, and improve the operation reliability of the entire electrolytic cell device.

[0046] As Figure 2As shown, in a further embodiment, the polar frame 20 is provided with a plurality of first positioning holes 23 distributed at intervals, and the titanium felt 31 is provided with a second positioning hole 322 corresponding to each first positioning hole 23, and the first positioning hole 23 and the second positioning hole 322 are connected by a positioning pin. In this embodiment, the protruding part 311 of the titanium felt 31 and the limiting groove 22 of the polar frame 20 are matched to make the polar frame 20 appear between the titanium mesh 32 and the titanium felt 31, and the first positioning hole 23 and the second positioning hole 322 are preliminarily positioned, and the titanium felt 31 and the polar frame 20 are further fixed and connected by the positioning pin, so as to ensure that the titanium felt 31 fully covers the inner frame edge of the polar frame 20, and further improve the isolation performance between the membrane electrode and the polar plate 10.

[0047] As shown in the drawings, Figure 1 As shown, in a further embodiment, the number of polar frames 20 is two, and the number of electrolytic assemblies 30 is two. In this embodiment, each polar plate 10 corresponds to two polar frames 20, and the two polar frames 20 are symmetrically arranged on the two sides of the polar plate 10, and each polar plate 10 corresponds to two electrolytic assemblies 30, and the two electrolytic assemblies 30 are symmetrically arranged on the two sides of the polar plate 10, and the side surface of the titanium felt 31 away from the titanium mesh 32 in each electrolytic assembly 30 is flush with the side surface of the polar frame 20 away from the polar plate 10, that is, the electrolytic tank polar plate 100 in this embodiment comprises the titanium felt 31, the titanium mesh 32, the polar plate 10, the titanium mesh 32, the titanium felt 31 and the polar frame 20 arranged at intervals with the titanium mesh 32 and engaged with the titanium felt 31, so as to completely separate the polar plate 10 and the membrane electrode by the titanium mesh 32, the titanium felt 31 and the polar frame 20, and further ensure that the polar plate 10 and the membrane electrode are completely isolated.

[0048] As shown in the drawings, Figure 4 As shown in another embodiment, the titanium felt 31 and the titanium mesh 32 in each electrolytic tank polar plate 100 are arranged such that the end surfaces thereof are flush with the end surfaces of the polar frame 20 and are connected in close contact, and a protective frame 40 is arranged on the circumferential side of the connection to cover the close contact gap between the titanium felt 31 and the polar frame 20 and between the titanium mesh 32 and the polar frame 20, so as to realize fixed connection between the titanium felt 31, the titanium mesh 32 and the polar frame 20 by the protective frame 40, and ensure that the electrolytic tank polar plate 100 is sealed well during assembly and leakage is avoided.

[0049] In this embodiment, the electrolytic tank polar plate 100 is suitable for proton exchange membrane electrolysis and anion exchange membrane electrolysis.

[0050] The utility model also provides a kind of electrolytic tank device, including the electrolytic tank polar plate 100 of any one of above. Regarding electrolytic tank polar plate 100, it is not repeated here.

[0051] In the embodiment, the electrolytic cell device further comprises at least one membrane electrode, at least two first sealing gaskets and at least one second sealing gasket corresponding to the membrane electrode, the membrane electrode is located at the side of the electrolytic cell plate 100, and the membrane electrode is spaced apart from the electrolytic cell plate 100, the two first sealing gaskets are located on the two sides of the corresponding membrane electrode, and the second sealing gasket is located between the plate 10 and the titanium mesh 32 in the electrolytic cell plate 100. By arranging the first sealing gaskets on the two sides of the membrane electrode and the second sealing gaskets on the two sides of the electrolytic cell plate 100, the preliminary sealing of the membrane electrode and the plate 10 is realized, and by arranging the titanium felt 31, the titanium mesh 32 and the pole frame 20 matched and connected on the two sides of the plate 10 in the electrolytic cell plate 100, the sealing performance of the plate 10 in the electrolytic cell plate 100 is further ensured.

[0052] In a further embodiment, the number of electrolytic cell plates 100 is multiple, and the number of membrane electrodes is multiple. In the embodiment, the number of electrolytic cell plates 100 in the electrolytic cell device is multiple, the number of membrane electrodes is multiple, and the membrane electrodes and the electrolytic cell plates 100 are spaced apart, that is, the electrolytic cell device comprises multiple spaced-apart membrane electrodes and multiple electrolytic cell plates 100, which not only ensures the sealing performance of each electrolytic cell plate 100, improves the protection capability of the titanium felt 31, the titanium mesh 32 and the pole frame 20, but also further improves the production efficiency and yield of the electrolytic hydrogen production of the electrolytic cell device.

[0053] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0054] The above-described embodiments only express several implementation manners of the utility model, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An electrolytic cell electrode plate, characterized in that, include: Electrode plates; One or two pole frames, one pole frame is provided on one side of the pole plate, and each pole frame has a through opening at the center, and each pole frame has a limiting groove recessed from the through opening toward the side away from the pole plate. At least one set of electrolytic components is provided corresponding to each of the electrode frames. The electrolytic components are disposed in the through-holes corresponding to the electrode frames. Each set of electrolytic components includes a titanium felt and a titanium mesh located between the electrode plate and the titanium felt. The periphery of the titanium mesh is set to be spaced from the inner wall of the through-hole by a first preset distance, and the periphery of the titanium felt protrudes into the limiting groove, so that the titanium felt and the electrode frame are connected to isolate the electrode plate and the membrane electrode.

2. The electrolytic cell electrode plate according to claim 1, characterized in that, The titanium felt includes a protrusion extending into the limiting groove, the width of which is any value between 0.5mm and 2mm.

3. The electrolytic cell electrode plate according to claim 2, characterized in that, d < the first preset distance < 2d, where d is the width of the protrusion.

4. The electrolytic cell electrode plate according to claim 3, characterized in that, Both the electrode plate and the electrode frame are made of titanium.

5. The electrolytic cell electrode plate according to claim 4, characterized in that, The connection method between the titanium mesh and the electrode plate is any one of sintering, laser welding or resistance welding; The connection between the titanium mesh and the titanium felt can be achieved by any one of sintering, laser welding, or resistance welding.

6. The electrolytic cell electrode plate according to claim 5, characterized in that, The pole frame is provided with a plurality of first positioning holes spaced apart, and the titanium felt is provided with second positioning holes that correspond one-to-one with the first positioning holes. The first positioning holes and the second positioning holes are connected by positioning pins.

7. The electrolytic cell electrode plate according to any one of claims 1-6, characterized in that, The number of the pole frames is two, and the number of the electrolysis components is two.

8. An electrolytic cell apparatus, characterized in that, The electrolytic cell apparatus includes the electrode plates of any one of claims 1-7, and further includes: At least one membrane electrode is located on the side of the electrolytic cell electrode plate, and the membrane electrode is spaced apart from the electrolytic cell electrode plate. At least two first sealing gaskets are provided in a one-to-one correspondence with the membrane electrode and are located on both sides of the corresponding membrane electrode; At least one second sealing gasket is located between the electrode plate and the titanium mesh in the electrolytic cell electrode plate.

9. The electrolytic cell apparatus according to claim 8, characterized in that, The number of electrolytic cell plates is multiple, and the number of membrane electrodes is multiple.

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