Alkaline electrolytic bath and preparation method thereof

Abstract

The invention relates to an alkaline electrolytic bath and a preparation method thereof, and belongs to the technical field of water electrolysis hydrogen production devices. The alkaline electrolytic cell comprises a plurality of axially arranged annular pole frames, the thickness direction of the annular pole frames is the axial direction, and the surfaces perpendicular to the axial direction are the contact surfaces of the adjacent annular pole frames. A diaphragm is embedded in the middle position of the annular pole frame in the thickness direction and seals a central hole of the annular pole frame; electrodes and sealing gaskets are arranged between the adjacent annular electrode frames, polar plates are clamped in the electrodes, and the edges of the polar plates extend out of the electrodes and are clamped between the annular electrode frames and the sealing gaskets; and the annular pole frame is made of a glass cloth-resin composite material. The adopted materials can resist erosion of alkaline electrolyte, and the polymer diaphragm can be embedded in the annular pole frame in the injection molding process, so that the connection strength and the sealing performance of the diaphragm and the annular pole frame are structurally improved. And due to the light weight, the safety and convenience of the installation process and the subsequent maintenance process are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water electrolysis hydrogen production devices, and particularly relates to an alkaline electrolytic cell and a preparation method thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] Green hydrogen is produced using renewable energy sources such as wind power, hydropower, and solar energy. Alkaline water electrolysis is the mainstream method for producing green hydrogen. This process typically uses a high-concentration potassium hydroxide (KOH) or sodium hydroxide (NaOH) solution as the electrolyte. The electrode frame of the electrolytic cell is constructed from ordinary mild steel. To resist alkaline corrosion in temperatures around 90°C, the mild steel is nickel-plated.

[0004] Nickel materials increase the raw material cost of the electrolytic cell, and because the thermal expansion coefficient of the nickel plating is different from that of the low-carbon steel substrate, the nickel plating is prone to cracking or peeling during long-term operation of the device, causing corrosion of the substrate and even leading to safety accidents.

[0005] On the other hand, the pole frame needs to be welded after rolling, and then undergo stress relief heat treatment and machining. The preparation process is complicated and there is serious waste of materials. Moreover, the metal pole frame and the alkaline electrolytic cell diaphragm are easily damaged during the assembly process. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an alkaline electrolytic cell and a preparation method thereof, which adopts a pole frame made of a composite material to improve the corrosion resistance to alkaline electrolyte. During the preparation process, the pole frame and the alkaline electrolytic cell diaphragm are integrally formed, simplifying the operation method and reducing the damage that may occur during the preparation process.

[0007] In order to achieve the above object, the technical solution of the present invention is: In a first aspect, an alkaline electrolytic cell comprises a plurality of axially arranged annular pole frames, wherein the thickness direction of the annular pole frames is the axial direction, and the surfaces perpendicular to the axial direction serve as contact surfaces between adjacent annular pole frames; a diaphragm is embedded in the middle of the thickness direction of the annular pole frames, the diaphragm sealing the central hole of the annular pole frames; electrodes and sealing gaskets are disposed between adjacent annular pole frames, the electrodes sandwiching a pole plate, the edges of the pole plate extending beyond the electrodes and being sandwiched between the annular pole frames and the sealing gasket; The annular pole frame is made of a glass cloth-resin composite material.

[0008] In a second aspect, a method for preparing the alkaline electrolytic cell comprises: S1. Using an injection molding method, a glass cloth-resin composite material is prepared into an annular pole frame. During the injection molding process, a diaphragm is embedded in the middle position of the annular pole frame in a thickness direction; S2. Prepare multiple annular pole frames with diaphragms, set electrodes, pole plates and sealing gaskets between adjacent annular pole frames, and then connect the multiple annular pole frames into one.

[0009] The beneficial effects of the present invention are: The present invention utilizes a glass cloth-resin composite material to manufacture the annular pole frame. This material is resistant to corrosion by alkaline electrolytes, overcoming the problems of nickel-plated low-carbon steel, which is not corrosion-resistant, and the significant waste of materials during the manufacturing process. Furthermore, the polymer diaphragm can be embedded in the annular pole frame during the injection molding process, eliminating the need for on-site installation. This structurally improves the connection strength and sealing between the diaphragm and the annular pole frame, overcoming the problems of diaphragm damage and low precision that can easily result from on-site diaphragm installation. Furthermore, its light weight improves the safety and convenience of the installation and subsequent maintenance processes, reduces the strength requirements of the electrolytic cell bracket, and correspondingly reduces the construction difficulty of the electrolytic cell's supporting foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding 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 improper limitations on the present invention.

[0011] Figure 1 Schematic diagram of the structure of the annular pole frame in Example 1, wherein (a) is a view perpendicular to the axial direction, and (b) is a cross-sectional view along the CC direction in (a).

[0012] Figure 2 Schematic diagram of the structure of the alkaline electrolytic cell of Example 1, wherein (a) is an axial cross-sectional view of the alkaline electrolytic cell, and (b) is a partial enlarged view of the W position in (a).

[0013] Figure 3 for Figure 1 A local enlarged view of the X position in (b).

[0014] Figure 4 for Figure 1 The cross-sectional view of Figure (a) in the figure, wherein (a) is the cross-sectional view in the DD direction and (b) is the cross-sectional view in the EE direction.

[0015] Wherein, 1, annular pole frame; 2, diaphragm; 3, pole plate; 4, elastic supporting element; 5, electrode; 6, sealing gasket; 7, positioning pin; 8, positioning hole; 9, electrolyte inlet; 10, electrolyte inlet runner; 11, gas-liquid two-phase flow runner; 12, gas-liquid two-phase flow outlet; 13, sealing gasket mounting groove; 14, pole plate mounting groove; 15, electrode mounting groove. DETAILED DESCRIPTION

[0016] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0017] It is also important to note that the terms used herein are not intended to limit the exemplary embodiments to the specific embodiments which are described in detail. Rather, it is contemplated that the terms are intended to cover all possible bases, forms, and / or combinations of the same, unless otherwise defined. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It is further understood that the use of the term "comprise" and / or "include" in this specification indicates the presence of a feature, step, operation, device, component, and / or combination thereof.

[0018] One or more embodiments of the present application provide an alkaline electrolyzer, comprising a plurality of annular pole frames arranged in an axial direction, the thickness direction of the annular pole frame being the axial direction, and the surface perpendicular to the axial direction being the contact surface of adjacent annular pole frames; a diaphragm is embedded in the middle position of the thickness direction of the annular pole frame, and the diaphragm seals the central hole of the annular pole frame; an electrode and a sealing gasket are arranged between adjacent annular pole frames, the electrode clamps a pole plate, and the pole plate extends out of the electrode and is clamped between the annular pole frame and the sealing gasket. The annular pole frame is made of glass cloth-resin composite material.

[0019] In the above structure, the annular pole frame is made of glass cloth-resin composite material, which overcomes the problems of nickel-plated low-carbon steel material not being corrosion-resistant and material waste being serious in the preparation process; and the high molecular diaphragm does not need to be installed on site, greatly improving the connection strength and sealing performance of the diaphragm and the annular pole frame in structure. The diaphragm is one of the core components of alkaline electrolytic water hydrogen production, and its functions include: physically isolating the cathode chamber and the anode chamber of the electrolyzer, forming independent electrolytic cell devices between adjacent diaphragms, and carrying out the process of alkaline electrolytic water hydrogen production; ensuring that the hydrogen (H2) generated by the cathode and the oxygen (O2) generated by the anode are separated through their respective flow channels to avoid mixing to form explosive gas; the diaphragm needs to allow the hydroxyl ions (OH⁻) and potassium ions (K⁺) in the electrolyte to move freely to form a closed circuit; as an insulating layer, the diaphragm can prevent the cathode and the anode from directly contacting to cause short circuit, ensuring the stable operation of the electrolyzer.

[0020] Optionally, the contact surface is provided with an electrode mounting groove, a plate mounting groove and a sealing gasket mounting groove in sequence from the inside to the outside in the radial direction, which matches the structure in which the electrode extends from the edge of the plate and is clamped between the annular pole frame and the sealing gasket.

[0021] Optionally, the electrode and the electrode plate are connected by an elastic support element; the elastic support element includes nickel wire, which has high conductivity and resistance to alkaline corrosion, mainly provides elastic support for the electrode, and serves as a conductive bridge between the electrode plate and the electrode, transferring current to the active area (anode and cathode) of the electrolysis reaction, so that the current is evenly distributed on the electrode surface, avoiding local overheating or uneven reaction, ensuring the efficient conduct of the electrochemical reaction, and thus improving the overall efficiency.

[0022] Optionally, the electrode plate is made of nickel-plated steel, which works in conjunction with the diaphragm to physically isolate the anode and cathode regions, preventing the oxygen generated by the anode and the hydrogen generated by the cathode from mixing, thereby avoiding the risk of explosion.

[0023] Optionally, electrodes are provided on both sides of the electrode plate in the axial direction, and the two electrodes are arranged opposite to each other. The electrodes are made of corrosion-resistant nickel wire, which serves as a conductive medium to transfer electrons from an external DC power supply to the reaction interface. It is the site of the electrochemical reaction of electrolyzing water to produce hydrogen and oxygen. The electrodes are usually porous or mesh structures, which increase the electrolysis surface area, promote the rapid detachment of bubbles, reduce the polarization effect, and improve the electrolysis efficiency.

[0024] Optionally, adjacent annular pole frames are connected by a positioning pin hole structure, and the positioning pin hole structure is arranged on the outside of the sealing gasket installation groove, the setting surface of the positioning pin is raised on the contact surface, and the setting surface of the positioning hole is recessed in the contact surface; the positioning pin hole structure is arranged in 2 to 3 groups.

[0025] Optionally, the height of the positioning pin is greater than the depth of the positioning hole, and the size difference is 2-3 mm; to avoid mutual jamming during assembly; the outer diameter of the positioning pin is smaller than the inner diameter of the positioning hole.

[0026] Optionally, the sealing gasket is provided with a V-shaped groove on the side facing the central hole; the sealing gasket can achieve an effective self-sealing effect with the help of the pressure of the electrolyte in the electrolytic cell; the V-shaped groove can ensure that the sealing gasket fits tightly with the resin glass cloth pole frame, meeting its static and dynamic sealing performance requirements, preventing leakage of alkaline electrolyte solution and gas, and ensuring stable, safe and reliable operation of the electrolytic cell.

[0027] Optionally, the annular pole frame is provided with a through electrolyte inlet in the axial direction, and the annular pole frame is provided with an electrolyte inlet flow channel connected to the central hole in the radial direction; the electrolyte inlet is connected to the electrolyte inlet flow channel; an axially through gas-liquid two-phase flow outlet is provided at a position away from the electrolyte inlet, and a gas-liquid two-phase flow channel connected to the central hole is provided at a position away from the electrolyte inlet flow channel, and the liquid two-phase flow outlet is connected to the gas-liquid two-phase flow channel; the electrolyte inlet is used to input electrolyte from the outside, and the electrolyte inlet flow channel is used to divert the electrolyte to the electrolysis reaction positions between each annular pole frame to ensure that the electrolyte is evenly distributed inside the electrolytic cell chamber; the gas-liquid two-phase flow outlet is used to transport electrolysis products to the outside, and the gas-liquid two-phase flow channel is used to centrally transport the electrolysis products generated between each annular pole frame.

[0028] Optionally, the edges of the electrolyte inlet flow channel and the gas-liquid two-phase flow channel are respectively provided with a plurality of continuous tooth-shaped protrusions, and the tooth-shaped protrusions are directed toward the center of the flow channel; the tooth-shaped protrusions of the electrolyte inlet flow channel mainly function to destroy the boundary layer of the liquid flow, change the laminar flow into turbulent flow, and prevent the crystallization and deposition of the electrolyte; the tooth-shaped protrusions of the gas-liquid two-phase flow channel mainly function to destroy the boundary layer of the liquid flow, change the laminar flow into turbulent flow, prevent the crystallization and deposition of the electrolyte and break up the bubbles, thereby preventing the bubbles from adhering to the electrode surface and causing the resistance to increase.

[0029] One or more embodiments of the present invention provide a method for preparing the above-mentioned alkaline electrolytic cell, comprising: S1. Using an injection molding method, a glass cloth-resin composite material is prepared into an annular pole frame. During the injection molding process, a diaphragm is embedded in the middle position of the annular pole frame in a thickness direction; S2. Prepare multiple annular pole frames with diaphragms, set electrodes, pole plates and sealing gaskets between adjacent annular pole frames, and then connect the multiple annular pole frames into one.

[0030] In the above process, the diaphragm and the annular pole frame are integrally formed by injection molding using a special mold and tooling, which can ensure the close connection between the diaphragm and the annular pole frame, avoid the separate rounding of the diaphragm and the breaking of the edge after rounding at the assembly site, avoid the shrinkage problem caused by long-term storage, and avoid the uneven folding and difficult edge alignment of the diaphragm during the assembly process, reduce the difficulty of assembling the pole frame and diaphragm in the electrolytic cell, reduce the labor intensity of workers, reduce assembly costs and improve work efficiency.

[0031] Optionally, in S2, the electrolyte inlets of adjacent pole frames are distributed along a straight line, and the gas-liquid two-phase flow outlets of adjacent pole frames are distributed along a straight line; the electrolyte inlet is arranged below the electrolytic cell, for inputting electrolyte from the bottom of the electrolytic cell chamber; the gas-liquid two-phase flow outlet is used to output electrolysis products from the top of the electrolytic cell chamber.

[0032] Optionally, in S2, adjacent annular pole frames are positioned and connected by a positioning pin hole structure, and the V-groove of the sealing gasket is compressed to an appropriate degree by squeezing the internal electrolyte to ensure the sealing effect.

[0033] Example 1 An alkaline electrolytic cell comprising a plurality of Figure 1 In the annular pole frame 1 of the glass cloth-resin composite material shown in (a), the central axis direction of the annular pole frame 1 is the axial direction, that is, the thickness direction of the annular pole frame 1; the direction perpendicular to the axial direction is the radial direction, as shown in FIG. Figure 1 As shown in (b), a diaphragm 2 is embedded in the middle of the thickness direction of the annular pole frame 1, and the diaphragm 2 closes the central hole of the annular pole frame 1; Figure 2 As shown in (a) in the figure, the alkaline electrolytic cell is composed of multiple annular pole frames 1 connected axially. The multiple annular pole frames 1 are divided into multiple electrolytic cell chambers by structures such as diaphragms 2 and pole plates 3. Each electrolytic cell chamber is provided with an electrode 5. Hydrogen bubbles or oxygen bubbles are generated on the surface of the electrode 5 through the electrolysis reaction. The bubbles float up and are collected and transported to the outside as electrolytic hydrogen and electrolytic oxygen.

[0034] like Figure 2 As shown in (b), electrodes 5 and sealing gaskets 6 are provided between adjacent annular pole frames 1 , and pole plates 3 are clamped in the electrodes 5 . The edges of the pole plates 3 extend beyond the edges of the electrodes 5 and are clamped between the annular pole frames 1 and the sealing gaskets 6 .

[0035] like Figure 1 As shown in (b), the surface of the annular pole frame 1 perpendicular to the axial direction is the contact surface of the adjacent annular pole frame 1; the contact surface is divided into contact surface A and contact surface B, as shown in FIG. Figure 3 As shown in (a), the contact surface A is provided with an electrode mounting groove 15, a plate mounting groove 14 and a sealing gasket mounting groove 13 in sequence from the inside to the outside in the radial direction; Figure 2 (b) The edge of the middle plate 3 extends out of the electrode 5 and is clamped between the annular pole frame 1 and the sealing gasket 6 to match the structure; the contact surface B is relatively flat and is used to fit and seal with the sealing gasket 6.

[0036] like Figure 3 As shown in (a), the embedding depth of the diaphragm 2 is in a set ratio to the radial width of the annular pole frame 1, which can ensure a tight connection between the diaphragm 2 and the annular pole frame 1.

[0037] like Figure 2 As shown in (b), the electrode 5 is connected to the electrode plate 3 via an elastic support element 4; the elastic support element 4 includes a nickel wire, which mainly provides elastic support for the electrode 5 and serves as a conductive bridge between the electrode plate 3 and the electrode 5.

[0038] like Figure 2As shown in (b), the electrode plate 3 is nickel-plated steel, which works together with the diaphragm 2 to physically isolate the anode and cathode regions.

[0039] like Figure 2 As shown in (b), electrodes 5 are provided on both sides of the electrode plate 3 in the axial direction. The two electrodes 5 are arranged opposite to each other. The electrodes 5 are made of corrosion-resistant nickel wire and are the site of the electrochemical reaction of electrolyzing water to produce hydrogen and oxygen. The electrodes 5 adopt a mesh structure to increase the electrolysis surface area and promote the rapid detachment of bubbles.

[0040] like Figure 2 As shown in (b), adjacent annular pole frames 1 are connected by a positioning pin hole structure, which is arranged on the outside of the sealing gasket 6, the positioning pin 7 is arranged on the contact surface A and protrudes from the contact surface A, and the positioning hole 8 is arranged on the contact surface B and is recessed from the contact surface B; three groups of positioning pin hole structures are arranged circumferentially on the annular pole frame 1.

[0041] like Figure 3 As shown in (a), the height a of the positioning pin 7 is smaller than the depth b of the positioning hole 8, and the size difference is 2mm; to avoid mutual jamming during assembly; the outer diameter of the positioning pin 7 is smaller than the inner diameter of the positioning hole 8; due to the presence of the sealing gasket mounting groove 13, the plane where the positioning pin 7 is located becomes a sealing convex surface higher than the bottom surface of the sealing gasket mounting groove 13, and accordingly, the position where the positioning hole 8 is located is partially recessed to become a sealing concave surface with a depth of c, the radial width of the sealing convex surface is m, and the radial width of the sealing concave surface is n, and the dimension n is 1mm larger than the dimension m; through the above-set size difference, it is possible to make appropriate gaps between the rigid structures of adjacent annular pole frames 1, and by adjusting these gaps during the installation process , which can compress the elastic sealing gasket 6 and the mesh structure electrode 5 to a set degree, ensuring smooth installation and ensuring the sealing effect between multiple structures; the depth d of the sealing gasket mounting groove 13 is equal to the dimension c and is 2 mm larger than the thickness of the sealing gasket 6, ensuring that the sealing gasket 6 is effectively compressed in the sealing gasket mounting groove 13 and is not stuck to the annular pole frame 1; the depth h of the electrode mounting groove 15 is equal to the thickness of the electrode 5, and the depth f of the pole plate mounting groove 14 is equal to 2 times h plus the sum of the thickness of the pole plate 3, ensuring that the pole plate 3 and the electrode 5 are firmly pressed on the pole plate mounting groove 14 and the electrode mounting groove 15 while the sealing gasket 6 is compressed by the annular pole frame 1.

[0042] The sealing gasket 6 is a self-sealing gasket with an annular groove on its inner side, and the cross-section of the annular groove is V-shaped, forming a V-groove; when the sealing gasket 6 is subjected to the internal pressure of the electrolytic cell, the component of the pressure acts on the inclined surface of the V-groove, so that the outer side of the sealing gasket 6 is tightly pressed against the contact surface between the sealing gasket mounting groove 13 and the adjacent annular pole frame 1, so that the self-sealing gasket 6 is better deformed to fill the sealing surface gap, thereby meeting its static and dynamic sealing performance requirements.

[0043] like Figure 1 As shown in (a), the annular pole frame 1 is provided with an electrolyte inlet 9 in the axial direction, and the annular pole frame 1 is provided with an electrolyte inlet flow channel 10 in the radial direction that is connected to the central hole; Figure 4 As shown in (a), the electrolyte inlet 9 is connected to the electrolyte inlet flow channel 10; Figure 1 As shown in (a), an axially penetrating gas-liquid two-phase flow outlet 12 is provided at a position away from the electrolyte inlet 9, and a gas-liquid two-phase flow channel 11 communicating with the central hole is provided at a position away from the electrolyte inlet flow channel 10. Figure 4 As shown in (b), the gas-liquid two-phase flow outlet 12 is connected to the gas-liquid two-phase flow channel 11; the electrolyte inlet 9 is used to input electrolyte from the outside, and the electrolyte inlet flow channel 10 is used to divert the electrolyte to the electrolytic cell chambers between each annular pole frame 1; the gas-liquid two-phase flow outlet 12 is used to transport electrolysis products to the outside, and the gas-liquid two-phase flow channel 11 is used to centrally transport the electrolysis products generated in each electrolytic cell chamber.

[0044] The edges of the electrolyte inlet flow channel 10 and the gas-liquid two-phase flow channel 11 are respectively provided with a plurality of continuous tooth-shaped protrusions, and the tooth-shaped protrusions face the center of the flow channel; the tooth-shaped protrusions of the electrolyte inlet flow channel 10 mainly function to destroy the boundary layer of the liquid flow, change the laminar flow into turbulent flow, and prevent the crystallization and deposition of the electrolyte; the tooth-shaped protrusions of the gas-liquid two-phase flow channel 11 mainly function to destroy the boundary layer of the liquid flow, change the laminar flow into turbulent flow, prevent the crystallization and deposition of the electrolyte and break the bubbles, thereby preventing the bubbles from adhering to the surface of the electrode 5 and causing the resistance to increase.

[0045] The preparation method of the alkaline electrolytic cell of this embodiment includes: S1, using an injection molding method to prepare a glass cloth-resin composite material into an annular pole frame 1, and during the injection molding process, embedding the diaphragm 2 into the middle position of the annular pole frame 1 in the thickness direction; S2, prepare a plurality of annular pole frames 1 with diaphragms 2, set electrodes 5, pole plates 3 and sealing gaskets 6 between adjacent annular pole frames 1, and then place the plurality of annular pole frames 1 in the same manner as described above. Figure 2 The electrolyte inlets 9 of all annular pole frames 1 are connected as a whole in a straight line, and the gas-liquid two-phase flow outlets 12 of all annular pole frames 1 are distributed along a straight line; and the electrolyte inlet 9 is arranged at the bottom, which meets the requirements of inputting electrolyte from the bottom and outputting electrolytic hydrogen from the top.

[0046] During the installation process of adjacent annular pole frames 1 , positioning connection is performed through the positioning pin hole structure to ensure the sealing effect.

[0047] In this embodiment, since the annular electrode frame is made of a glass cloth-resin composite material, nickel plating is not required, reducing the cost of nickel plating. This also avoids stress caused by the difference in thermal expansion coefficients between the nickel plating and the low-carbon steel substrate due to temperature fluctuations during long-term operation of the electrolytic cell. It also avoids hydrogen embrittlement and alkali embrittlement caused by long-term contact of the metal with hydrogen and alkaline substances, significantly reducing processing costs and extending the service life of the electrolytic cell. Furthermore, the significantly reduced mass of the annular electrode frame prevents sagging and deformation of the electrolytic cell caused by the effects of electrolyte and gravity during long-term operation. It also reduces the construction difficulty and high bearing capacity of the traditional electrolytic cell's bulky concrete foundation, significantly reducing the construction cost of the concrete foundation. The insulating composite material also avoids the problems of short circuits between the electrode frames caused by damaged insulating gaskets and leakage and spraying of liquid from the electrolytic cell caused by interface seal failure, as is the case with traditional low-carbon steel. It can be integrated with the diaphragm by injection molding, avoiding uneven folding and difficult edge alignment of the diaphragm during on-site assembly, reducing the difficulty of assembling the pole frame and diaphragm in the electrolytic cell, reducing the labor intensity and assembly cost of workers and improving work efficiency; at the same time, it also avoids the problem of diaphragm shrinkage and edge breakage caused by manual cutting of the diaphragm after marking with a circular mold at the assembly site and long-term storage of the diaphragm.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An alkaline electrolytic cell, characterized in that The invention comprises a plurality of annular pole frames arranged in an axial direction, wherein the thickness direction of the annular pole frames is the axial direction, and the surface perpendicular to the axial direction is the contact surface of adjacent annular pole frames; a diaphragm is embedded in the middle position of the thickness direction of the annular pole frames, and the diaphragm seals the central hole of the annular pole frames; electrodes and sealing gaskets are arranged between adjacent annular pole frames, and a pole plate is sandwiched between the electrodes, and the edge of the pole plate extends out of the electrode and is sandwiched between the annular pole frames and the sealing gasket; the annular pole frames are made of glass cloth-resin composite materials.

2. The alkaline electrolytic cell according to claim 1, wherein The contact surface is provided with an electrode mounting groove, a plate mounting groove and a sealing gasket mounting groove in sequence from the inside to the outside in the radial direction.

3. The alkaline electrolytic cell according to claim 1, wherein The electrode and the electrode plate are connected via an elastic support element; the elastic support element comprises a nickel wire.

4. The alkaline electrolytic cell according to claim 3, wherein The electrode plates are made of nickel-plated steel.

5. The alkaline electrolytic cell according to claim 1, wherein Electrodes are respectively provided on both sides of the polar plate in the axial direction. The two electrodes are arranged opposite to each other and are made of corrosion-resistant nickel wire. The electrodes are porous or mesh-shaped.

6. The alkaline electrolytic cell according to claim 1, wherein Adjacent annular pole frames are connected by a positioning pin hole structure, which is arranged on the outside of the sealing gasket installation groove. The setting surface of the positioning pin is raised on the contact surface, and the setting surface of the positioning hole is recessed in the contact surface; the positioning pin hole structure is arranged in 2 to 3 groups.

7. The alkaline electrolytic cell according to claim 1, wherein The sealing gasket is provided with a V-shaped groove on one side facing the central hole.

8. The alkaline electrolytic cell according to claim 1, wherein The annular pole frame is provided with an electrolyte inlet extending in the axial direction, and an electrolyte inlet flow channel communicating with the central hole in the radial direction; the electrolyte inlet is communicated with the electrolyte inlet flow channel; an axially extending gas-liquid two-phase flow outlet is provided at a position away from the electrolyte inlet, and a gas-liquid two-phase flow channel communicating with the central hole is provided at a position away from the electrolyte inlet flow channel, and the liquid two-phase flow outlet is communicated with the gas-liquid two-phase flow channel; Alternatively, the edges of the electrolyte inlet flow channel and the gas-liquid two-phase flow channel are respectively provided with a plurality of continuous tooth-shaped protrusions, and the tooth-shaped protrusions face toward the center of the flow channel.

9. A method for preparing an alkaline electrolytic cell according to any one of claims 1 to 8, characterized in that: The following processes are included: S1. Using an injection molding method, a glass cloth-resin composite material is prepared into an annular pole frame. During the injection molding process, a diaphragm is embedded in the middle position of the annular pole frame in a thickness direction; S2. Prepare multiple annular pole frames with diaphragms, set electrodes, pole plates and sealing gaskets between adjacent annular pole frames, and then connect the multiple annular pole frames into one.

10. The method for preparing an alkaline electrolytic cell according to claim 9, wherein: In S2, the electrolyte inlets of adjacent pole frames are distributed along a straight line, and the gas-liquid two-phase flow outlets of adjacent pole frames are distributed along a straight line; Or, in S2, adjacent annular pole frames are positioned and connected via a positioning pin hole structure.

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