Water electrolysis hydrogen production device
By designing a bipolar pressure filter electrolyzer and using a composite catalyst layer, the problems of corrosion resistance and sealing of the electrode plates were solved, achieving uniform distribution of the electrolyte and extending the service life of the water electrolysis hydrogen production device.
Patent Information
- Application Number
- CN202520490839.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-20
AI Technical Summary
In existing water electrolysis hydrogen production devices, poor corrosion resistance of electrode plates, inadequate sealing performance, and uneven electrolyte distribution lead to severe corrosion and short service life.
The design employs a bipolar pressure filter electrolytic cell, using nickel-plated iron plates and composite catalyst layers to improve the corrosion resistance of the electrode plates. The flow guide plate creates turbulence to prevent electrolyte stagnation, double-layer sealing gaskets ensure airtightness, and the diffusion cavity evenly distributes the electrolyte.
This improves the corrosion resistance of the electrode plates, maintains sealing performance, prevents electrolyte precipitation and accumulation, and extends the service life of the device.
Smart Images
Figure CN223936617U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of water electrolysis hydrogen production technology, and specifically relates to a water electrolysis hydrogen production device. Background Technology
[0002] In existing water electrolysis hydrogen production technologies, the corrosion resistance of the electrode plates is a critical issue. As the core component of the electrolysis reaction, the electrode plates are constantly exposed to the highly corrosive environment of the electrolyte. Ordinary electrode plate materials are prone to corrosion in this environment, leading to a decrease in conductivity and consequently affecting electrolysis efficiency. For example, early metal electrode plates quickly rusted and corroded in the electrolyte, increasing maintenance costs and limiting the operational stability of the device.
[0003] Sealing performance is also a crucial factor affecting the performance of water electrolysis hydrogen production devices. During electrolysis, it is essential to prevent electrolyte leakage and also to avoid the mixing of generated hydrogen and oxygen. However, traditional sealing gaskets are prone to aging and deformation under long-term high temperatures, high pressures, and electrolyte corrosion, leading to a decline in sealing performance. Leakage not only wastes electrolyte but can also pose safety hazards.
[0004] In addition, uneven distribution of electrolyte within the electrolytic cell is a common problem. Localized electrolyte stagnation or sediment buildup leads to uneven electrolytic reactions, reduces electrolysis efficiency, and exacerbates corrosion of the electrode plates and the electrolytic cell. Insufficient electrolyte diffusion upon entering the electrolytic cell results in incomplete reactions in some areas, while other areas experience accelerated corrosion due to excessively high electrolyte concentrations. Utility Model Content
[0005] To address the above problems, the purpose of this utility model is to provide an electrolytic water hydrogen production device that solves the problems of poor corrosion resistance of existing electrode plates, poor sealing performance of sealing gaskets, and uneven distribution of electrolyte leading to severe corrosion and short service life of the device.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: an electrolytic water hydrogen production device, comprising a bipolar pressure filter electrolyzer, wherein the two ends of the bipolar pressure filter electrolyzer are pressed together by end plates, and the two end plates are connected by connecting bolts. The bipolar pressure filter electrolyzer is composed of multiple parallel electrolytic cells. The bipolar pressure filter electrolyzer includes electrode plates, each electrode plate including an anode plate, a cathode plate, and several bipolar plates. The anode plate and cathode plate are respectively disposed at the left and right ends of the bipolar pressure filter electrolyzer, and the bipolar plates are located between the anode plate and the cathode plate. The anode plate, bipolar plates, and cathode plates have the same structure, and the bipolar plates are formed with adjacent bipolar plates, anode plates, and cathode plates. An electrolytic cell is provided, in which an asbestos diaphragm is installed. A sealing gasket is sandwiched between the asbestos diaphragm and a bipolar plate. The sealing gasket includes an elastic sealing part and an expansion sealing part. Oxygen channel holes, hydrogen channel holes, and electrolyte channel holes are opened at opposite positions of the sealing gasket, the asbestos diaphragm, and the bipolar plate. The bipolar plate includes a nickel-plated iron plate and a cylinder frame fixed around the nickel-plated iron plate. The nickel-plated iron plate is connected to a power supply terminal. The cylinder frame on the anode and cathode sides of the nickel-plated iron plate has cuts connecting to the oxygen channel holes and hydrogen channel holes, respectively. Both sides of the nickel-plated iron plate around the electrolyte channel holes have funnel-shaped diffusion cavities. A guide plate is inserted into the electrolyte channel holes.
[0007] The beneficial effects of this utility model are as follows: the selective coating design effectively improves the corrosion resistance of the electrode plate; the installation of the guide plate creates turbulence when the electrolyte enters the electrolytic cell, avoiding local stagnation or sedimentation, which would exacerbate corrosion; the double-layer sealing gasket effectively maintains reliable sealing performance under long-term high-temperature conditions; in summary, the above technologies effectively reduce the corrosion of the device by the electrolyte and extend the service life of the device.
[0008] In order to effectively improve the sealing performance of the sealing gasket;
[0009] As a further improvement to the above technical solution: the expansion sealing part is embedded on the surface of the elastic sealing part, the elastic sealing part is an EPDM rubber structure, and the expansion sealing part is an expanded graphite layer.
[0010] The beneficial effects of this improvement are: the composite double-layer structure design achieves elastic sealing fit and expansion sealing upon contact with electrolyte, effectively improving the sealing performance of the sealing gasket.
[0011] To prevent the accumulation of precipitates through the use of a diffusion cavity;
[0012] As a further improvement to the above technical solution: the upper part of the diffusion cavity is tangent to the edge of the nickel-plated iron plate, and the diffusion cavity has a structure that is wider at the top and narrower at the bottom.
[0013] The beneficial effects of this improvement are: the electrolyte is evenly distributed to both sides of the electrolytic cell through the gradually expanding cross section of the diffusion cavity, preventing the accumulation of precipitates.
[0014] In order to effectively improve the corrosion resistance of the electrode plate;
[0015] As a further improvement to the above technical solution: the anode surface of the nickel-plated iron plate is sprayed with a porous platinum-carbon composite catalyst layer with a thickness of no more than 20 μm, and the cathode surface of the nickel-plated iron plate is electroplated with a porous nickel-molybdenum alloy layer with a thickness of 10-15 μm.
[0016] The beneficial effects of this improvement are: both platinum-carbon and nickel-molybdenum coatings are conductive materials, which do not affect the conductivity of the electrode plates and directly participate in the electrochemical reaction, thus avoiding substrate corrosion.
[0017] To further improve the corrosion resistance of the electrode plate;
[0018] As a further improvement to the above technical solution: the surface of the cylinder frame is coated with an epoxy resin insulating layer.
[0019] The beneficial effects of this improvement are: the epoxy resin insulating layer coated on the cylinder frame surface can prevent electrolyte penetration and corrosion.
[0020] In order to effectively avoid local stagnation within a single-hole channel by using a flow guide plate;
[0021] As a further improvement to the above technical solution: the guide plate is a polytetrafluoroethylene spiral plate structure.
[0022] The beneficial effect of this improvement is that the guide plate can create turbulence when the electrolyte enters the electrolytic cell, avoiding local stagnation.
[0023] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description
[0024] Figure 1 This is a cross-sectional view of the present invention;
[0025] Figure 2 This is a schematic diagram of the structure of this utility model;
[0026] Figure 3 This is a schematic diagram of the elastic sealing part in this utility model;
[0027] Figure 4 This is a schematic diagram of the diaphragm structure in this utility model;
[0028] Figure 5 This is a schematic diagram of the bipolar plate in this utility model;
[0029] In the diagram: 100, bipolar pressure filter electrolytic cell; 200, electrode plate; 1, end plate; 2, anode plate; 3, sealing gasket; 31, elastic sealing part; 32, expansion sealing part; 4, asbestos diaphragm; 5, bipolar plate; 51, cylinder frame; 52, nickel-plated iron plate; 53, power cord end; 54, diffusion chamber; 6, cathode plate; 7, guide plate; 8, connecting bolt; 9, oxygen channel hole; 10, hydrogen channel hole; 11, electrolyte channel hole; 12, electrolytic cell. Detailed Implementation
[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.
[0031] Example 1:
[0032] like Figure 1—5 shows: A water electrolysis hydrogen production device, including a bipolar pressure filter electrolyzer 100. The two ends of the bipolar pressure filter electrolyzer 100 are pressed together by end plates 1, and the two end plates 1 are connected by connecting bolts 8. The bipolar pressure filter electrolyzer 100 is composed of multiple parallel electrolytic cells 12. The bipolar pressure filter electrolyzer 100 includes electrode plates 200, each electrode plate 200 including an anode plate 2, a cathode plate 6, and several bipolar plates 5. Cathode plates 6 are respectively disposed at the left and right ends of the bipolar pressure filter electrolytic cell 100. Bipolar plates 5 are located between anode plates 2 and cathode plates 6, and the anode plates 2, bipolar plates 5, and cathode plates 6 have identical structures. An electrolytic cell 12 is formed between the bipolar plates 5 and adjacent bipolar plates 5, anode plates 2, and cathode plates 6. An asbestos diaphragm 4 is disposed in the electrolytic cell 12, and a sealing gasket 3 is sandwiched between the asbestos diaphragm 4 and the bipolar plates 5. The sealing gasket 3 includes an elastic and dense... The sealing part 31 and the expansion sealing part 32, the sealing gasket 3, the asbestos diaphragm 4, and the bipolar plate 5 are all provided with oxygen channel holes 9, hydrogen channel holes 10 and electrolyte channel holes 11 at opposite positions. The bipolar plate 5 includes a nickel-plated iron plate 52 and a cylinder frame 51 fixed around the nickel-plated iron plate 52. The nickel-plated iron plate 52 is connected to a power cord terminal 53. The cylinder frame 51 on the anode and cathode sides of the nickel-plated iron plate 52 has cuts that connect to the oxygen channel holes 9 and the hydrogen channel holes 10, respectively. The electrolyte channel hole 10 has two sides of the nickel-plated iron plate 52 around it, which are provided with a funnel-shaped diffusion cavity 54. A guide plate 7 is inserted in the electrolyte channel hole 11. The selective coating design effectively improves the corrosion resistance of the electrode plate 200. The installation of the guide plate 7 makes the electrolyte flow into the electrolytic cell 12 turbulent, avoiding local stagnation or sedimentation and aggravating corrosion. The double-layer sealing gasket 3 effectively maintains reliable sealing performance under long-term high temperature environment.In summary, the above technologies effectively reduce the corrosion of the device by the electrolyte and extend its service life. The expansion sealing part 32 is embedded on the surface of the elastic sealing part 31. The elastic sealing part 31 is an EPDM rubber structure, and the expansion sealing part 32 is an expanded graphite layer. The composite double-layer structure design achieves elastic sealing and expansion sealing upon contact with electrolyte, effectively improving the sealing performance of the sealing gasket 3. The upper part of the diffusion cavity 54 is tangent to the edge of the nickel-plated iron plate 52, and the diffusion cavity 54 has a structure that is wider at the top and narrower at the bottom. The electrolyte is evenly distributed to both sides of the electrolytic cell 12 through the gradually expanding cross section of the diffusion cavity 54, preventing the accumulation of precipitates. The anode surface of the nickel-iron plate 52 is sprayed with a porous platinum-carbon composite catalyst layer with a thickness of no more than 20 μm. The cathode surface of the nickel-iron plate 52 is electroplated with a porous nickel-molybdenum alloy layer with a thickness of 10-15 μm. Both the platinum-carbon and nickel-molybdenum coatings are conductive materials, which do not affect the conductivity of the plates and directly participate in the electrochemical reaction, avoiding corrosion of the substrate. The surface of the cylinder frame 51 is coated with an epoxy resin insulating layer, which can prevent electrolyte penetration and corrosion. The guide plate 7 is a polytetrafluoroethylene spiral plate structure, which can create turbulence when the electrolyte enters the electrolytic cell 12, avoiding local stagnation.
[0033] The working principle of this technical solution is as follows: the electrolyte enters the electrolytic cell 12 through the electrolyte channel hole 11. A polytetrafluoroethylene spiral plate 7 is inserted into the electrolyte channel hole 11. When the electrolyte flows through the guide plate 7, due to the spiral structure of the guide plate, the electrolyte forms turbulence, entering the electrolytic cell 12 in a more uniform and rapid manner. Simultaneously, both sides of the nickel-plated iron plate 52 surrounding the electrolyte channel hole 11 are provided with funnel-shaped diffusion cavities 54. The structure is wider at the top and narrower at the bottom, with its upper part tangent to the edge of the nickel-plated iron plate 52. As the electrolyte passes through the diffusion chamber 54, it is evenly distributed to both sides of the electrolytic cell 12 along the gradually widening cross-section, preventing localized accumulation of precipitates and ensuring the electrolyte fully and uniformly participates in the electrolytic reaction. When the power is turned on, the current is conducted to the nickel-plated iron plate 52 through the power line terminal 53. On one side of the anode plate 2, the anode surface of the nickel-plated iron plate 52 is sprayed with a porous platinum-carbon composite catalyst with a thickness not exceeding 20 μm. In the electrolysis process, under the influence of an electric field, water molecules undergo oxidation at the anode, producing oxygen and hydrogen ions. Oxygen enters the oxygen channel hole 9 through the cut on the cylinder frame 51 that connects to the anode surface and is eventually collected. On the cathode plate 6 side, the cathode surface of the nickel-plated iron plate 52 is electroplated with a porous nickel-molybdenum alloy layer with a thickness of 10-15 μm. Hydrogen ions gain electrons at the cathode and undergo a reduction reaction to generate hydrogen gas. The hydrogen gas enters the hydrogen channel hole 10 through the cut on the cylinder frame 51 that connects to the cathode surface and is also collected. Throughout the electrolysis process, the asbestos diaphragm 4 isolates hydrogen and oxygen to prevent them from mixing and causing danger. At the same time, the elastic sealing part 31 of the sealing gasket 3 maintains a good sealing effect by its own elasticity to prevent electrolyte leakage. When the expanding sealing part 32 of the sealing gasket 3 comes into contact with the electrolyte, the expanding graphite layer expands, further enhancing the sealing performance and ensuring that the device maintains reliable sealing under long-term high-temperature electrolysis conditions.
[0034] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.
Claims
1. A water electrolysis hydrogen production device, characterized in that: The system includes a bipolar pressure filter electrolytic cell (100), the two ends of which are pressed together by end plates (1), and the two end plates (1) are connected by connecting bolts (8). The bipolar pressure filter electrolytic cell (100) is composed of multiple parallel electrolytic cells (12). The bipolar pressure filter electrolytic cell (100) includes electrode plates (200), the electrode plates (200) including an anode plate (2), a cathode plate (6), and several bipolar plates. (5) The anode plate (2) and cathode plate (6) are respectively disposed at the left and right ends of the bipolar pressure filter electrolytic cell (100). The bipolar plate (5) is located between the anode plate (2) and the cathode plate (6), and the anode plate (2), bipolar plate (5), and cathode plate (6) have the same structure. An electrolytic cell (12) is formed between the bipolar plate (5) and the adjacent bipolar plate (5), anode plate (2), and cathode plate (6). The electrolytic cell (12) is provided with stone. The asbestos diaphragm (4) is sandwiched between the asbestos diaphragm (4) and the bipolar plate (5), and the sealing gasket (3) includes an elastic sealing part (31) and an expansion sealing part (32). The sealing gasket (3), the asbestos diaphragm (4), and the bipolar plate (5) are provided with oxygen channel holes (9), hydrogen channel holes (10) and electrolyte channel holes (11) at opposite positions. The bipolar plate (5) includes a nickel-plated iron plate (52) and a plate fixed on the nickel-plated iron plate. The cylinder frame (51) around the plate (52) is connected to the power supply terminal (53). The cylinder frame (51) on the side where the anode and cathode surfaces of the nickel-plated iron plate (52) are located has cuts connecting the oxygen channel hole (9) and the hydrogen channel hole (10). Both sides of the nickel-plated iron plate (52) around the electrolyte channel hole (11) are provided with a funnel-shaped diffusion cavity (54). A guide plate (7) is inserted in the electrolyte channel hole (11).
2. The water electrolysis hydrogen production device according to claim 1, characterized in that: The expansion sealing part (32) is embedded on the surface of the elastic sealing part (31), the elastic sealing part (31) is an EPDM rubber structure, and the expansion sealing part (32) is an expanded graphite layer.
3. The water electrolysis hydrogen production device according to claim 1, characterized in that: The upper part of the diffusion cavity (54) is tangent to the edge of the nickel-plated iron plate (52), and the diffusion cavity (54) has a structure that is wider at the top and narrower at the bottom.
4. The water electrolysis hydrogen production device according to claim 1, characterized in that: The anode surface of the nickel-plated iron plate (52) is sprayed with a porous platinum-carbon composite catalyst layer with a thickness of no more than 20 μm, and the cathode surface of the nickel-plated iron plate (52) is electroplated with a porous nickel-molybdenum alloy layer with a thickness of 10-15 μm.
5. The water electrolysis hydrogen production device according to claim 1, characterized in that: The surface of the cylinder frame (51) is coated with an epoxy resin insulating layer.
6. The water electrolysis hydrogen production apparatus according to claim 1, characterized in that: The guide plate (7) is a polytetrafluoroethylene spiral plate structure.