Bipolar plate structure of alkaline hydrogen production electrolytic cell and alkaline electrolytic cell

Abstract

The bipolar plate structure comprises an annular resin pole frame, a diaphragm welded to the annular resin pole frame through the inner wall of a circular hole, two main pole plates, two electrodes arranged on the two sides of the diaphragm respectively, and two supporting nets. The two main pole plates, the annular resin pole frame and the two electrodes form two cavities, and the two main pole plates and the two sides of the annular resin pole frame form a first flow channel and a second flow channel which are communicated with the two cavities respectively; the two main pole plates and the annular resin pole frame form a first gas-liquid hole communicated with the first flow channel and a second gas-liquid hole communicated with the second flow channel, and the two supporting nets are located in the two cavities respectively, so that the two sides of the supporting nets in the cavities abut against the electrodes and the main pole plates respectively. The electrolytic bath has the advantages that the diaphragm and the annular resin pole frame can be fused into a whole, so that the two cavities are isolated, the problem of internal leakage of the electrolytic bath is solved to a great extent, the risk of hydrogen and oxygen mixing is reduced, and the safety in the electrolytic process is improved.

Description

Technical Field

[0001] This invention relates to the field of electrolyzers, specifically to a bipolar plate structure for an alkaline hydrogen production electrolyzer and an alkaline electrolyzer. Background Technology

[0002] In existing electrolytic cells, the electrode frames are metal, such as... Figure 9 , Figure 17 As shown, the metal electrode frame and the electrode plate are welded together as a single unit (hereinafter referred to as metal electrode frame and electrode plate for ease of understanding). After assembly, a diaphragm and a gasket are placed between the two metal electrode frames and the electrode plate. The two metal electrode frames apply pressure to the gasket, causing the gasket to press and fix the diaphragm tightly. This results in two chambers formed by the two metal electrode frames, the diaphragm, and the gasket (one chamber is formed by the diaphragm and the metal electrode frame on one side). Electrolysis is achieved by placing the electrode plate in the chamber. However, this design has many drawbacks as described below.

[0003] The first drawback is that the diaphragm is easily damaged, leading to hydrogen-oxygen crosstalk: for example Figure 11 and Figure 14 Plastic gaskets press against the diaphragm to ensure an internal seal. However, in actual operation, the fluctuating high and low temperatures caused by the electrolytic cell lead to increased thermal expansion and contraction creep of the gaskets (e.g., ...). Figure 12 Since the gasket presses the part of the diaphragm outside the chamber onto the metal pole frame, the gasket tears and squeezes the diaphragm during the creep process, causing the diaphragm to wear or even break. The broken diaphragm no longer isolates the two chambers, causing the two chambers to connect and triggering hydrogen-oxygen cross-contamination. In severe cases, there is a risk of tank explosion.

[0004] The second drawback is the limitation on the size of the electrolytic cell: the method of using gaskets to fill the height difference between the two metal plates, as well as the materials of the gaskets and metal electrode frames, are only suitable for small to medium-sized standard-sized cells and stable operating conditions. In large cells, the water line is prone to shearing and stringing, and the seal may fail (e.g., Figure 13 This could lead to serious safety hazards such as leaks or even fires.

[0005] The third drawback is that traditional metal electrode frames achieve electrolyte corrosion protection through an outer surface plating (nickel). However, the material of the metal electrode frame is difficult to guarantee, and issues such as "cutting corners" in the electroplating process and difficulties in plating the channels lead to inconsistent plating quality, affecting long-term durable corrosion protection and causing severe channel corrosion (e.g., ...). Figure 16 Severe corrosion of the weld between the electrode plate and the metal electrode frame, and severe corrosion of the electrode plate (e.g.) Figure 15 and Figure 17 ).

[0006] The fourth drawback is severe electrochemical corrosion of the electrolytic cell: the main processing technology for bipolar plates in the electrolytic cell is machining, which requires turning, milling, welding, electroplating and other processes. The process is complicated and involves repeated clamping, making it difficult to ensure that the size of each bipolar plate is consistent. This increases the difficulty and precision of the subsequent assembly. The unevenness of the assembly size also increases the risk of leakage and sparking in the actual operation of the electrolytic cell.

[0007] The fifth drawback is the inconvenience of assembly and maintenance: due to inconsistencies in the processing of components in traditional electrolytic cells, each component needs to be measured and inspected piece by piece during assembly (e.g., Figure 18 Furthermore, the installation of electrodes and membranes requires a significant amount of manual labor, and the cumbersome process results in low assembly efficiency. Additionally, maintenance requires returning the electrolyzer to the factory for disassembly and reassembly, leading to a lack of assurance regarding continuous hydrogen supply.

[0008] The sixth drawback is site limitation: traditional large-scale electrolytic cells weigh tens of tons, which requires high foundation bearing capacity, makes transportation and installation difficult, and the limited site makes it difficult to adapt to the needs of flexible scenarios such as mobile platforms and distributed systems.

[0009] Therefore, it is necessary to provide a bipolar plate structure for an alkaline hydrogen production electrolyzer. Summary of the Invention

[0010] The present invention provides a bipolar plate structure for an alkaline hydrogen production electrolyzer, which effectively solves the problem of easy cross-contamination between hydrogen and oxygen in existing bipolar plate electrolysis structures.

[0011] The technical solution adopted in this invention is: a bipolar plate structure for an alkaline hydrogen production electrolyzer, comprising an annular resin electrode frame with circular holes, a diaphragm fused to the annular resin electrode frame through the inner wall of the circular holes, two main electrode plates respectively disposed on both sides of the annular resin electrode frame, two electrodes respectively disposed on both sides of the diaphragm, the two main electrode plates forming two chambers with the annular resin electrode frame and the two electrodes, the two main electrode plates forming hydrogen liquid channels and oxygen liquid channels respectively connected to the two chambers with both sides of the annular resin electrode frame, the two main electrode plates forming alkaline liquid channels respectively connected to both chambers, and the two main electrode plates forming hydrogen liquid channels connected to the hydrogen liquid channels, oxygen liquid channels connected to the oxygen liquid channels, and alkaline liquid channels connected to the alkaline liquid channels.

[0012] Furthermore, it also includes two support components, which are located in the two chambers respectively, such that the two sides of the support components located in the chambers abut against the electrode and the main electrode plate respectively.

[0013] Furthermore, the support component is a nickel mesh.

[0014] Furthermore, the annular resin electrode frame includes an annular frame body, several limiting buckles disposed on one side of the annular frame body, and several grooves disposed on the other side of the annular frame body corresponding to the limiting buckles. The limiting buckles can be projected along the axial direction of the annular frame body into the corresponding grooves. The main electrode plate is provided with several through holes that cooperate with the limiting buckles.

[0015] Furthermore, the limiting buckle includes a first post connected to the annular resin frame body and a protrusion located at the end of the first post and extending away from the outer side of the annular frame body. The distance between the protrusion and the annular resin frame body is greater than the thickness of the main electrode plate. The through hole includes a first hole and a second hole that are conductive. Both the first post and the protrusion can pass through the first hole, the first post can pass through the second hole, and the protrusion cannot pass through the second hole.

[0016] Furthermore, the protrusion is planar on the side opposite to the annular resin frame body.

[0017] Furthermore, a first sealing assembly and a second sealing assembly are respectively provided between the annular resin electrode frame and the two main electrode plates.

[0018] Furthermore, the first sealing component is a first O-ring, the second sealing component is a second O-ring, and the two sides of the annular resin pole frame are respectively provided with a first annular groove for installing the first O-ring and a second annular groove for installing the second O-ring.

[0019] Furthermore, the circular hole, the first O-ring seal, and the second O-ring seal are concentric, the diameter of the first O-ring seal is smaller than the diameter of the second O-ring seal, and the hydrogen liquid channel and the oxygen liquid channel are located on both sides of the first O-ring seal.

[0020] An alkaline electrolyzer includes several bipolar plate structures for alkaline hydrogen production electrolyzers, and further includes a first pressure plate, a second pressure plate, a first conductive busbar, a second conductive busbar, and several connecting components connecting the first pressure plate and the second pressure plate. The first pressure plate is provided with a hydrogen liquid outlet corresponding to the hydrogen liquid channel, an oxygen liquid outlet corresponding to the oxygen liquid channel, and an inlet corresponding to the alkaline liquid channel. The first pressure plate is also provided with a hydrogen liquid transition through hole corresponding to the hydrogen liquid channel, an oxygen liquid transition through hole corresponding to the oxygen liquid channel, and an inlet transition hole corresponding to the alkaline liquid channel. After the several bipolar plate structures for alkaline hydrogen production electrolyzers are stacked, the two outermost main plates are respectively abutted by the first conductive busbar and the second conductive busbar. The first pressure plate and the second pressure plate respectively press the outer sides of the first conductive busbar and the second conductive busbar.

[0021] Beneficial effects of the invention: 1. Compared with the traditional method of welding metal electrode frames to electrode plates and then using gaskets to press the diaphragm onto the electrode frame, in this application, the electrode frame is made of resin material. By welding the annular resin electrode frame and the diaphragm into an integral structure, and then stacking the two electrode plates on both sides of the annular resin electrode plate in a non-welded manner, two chambers are formed. This makes it less likely for the diaphragm to detach from the electrode frame during electrolysis, and prevents gas from flowing between the two chambers, thus improving the overall safety and reliability.

[0022] 2. By adopting the bipolar plate and electrolytic cell of this application, the traditional gasket structure and the connection method of pressing the gasket and diaphragm are eliminated. Instead, No. 1 O-ring and No. 2 O-ring are used to isolate the electrode frame from the electrode plates on both sides. This overcomes the difficulty of traditional gasket seals being only suitable for small and medium-sized standard square tanks and stable operating conditions, eliminates the gasket creep problem caused by temperature rise and fall during electrolytic cell operation, and improves safety.

[0023] 3. The new bipolar plate adopts an integrated diaphragm and frame structure, eliminating the diaphragm laying process. The injection molding process ensures the consistency of the bipolar plate and eliminates the measurement and inspection process. In addition, the clamping position connecting the bipolar plate and the main plate can also be used for positioning in the electrolytic cell assembly, making the assembly operation simpler and the assembly accuracy higher.

[0024] 4. The structure of this application adopts a resin electrode frame. Compared with the metal electrode frame, the weight of the non-metallic electrolytic cell of the same volume is only 1 / 3 of that of the metal electrolytic cell, which greatly reduces the pressure of assembly, hoisting and transportation.

[0025] 5. The hydrogen liquid channel and the oxygen liquid channel are located on both sides of the No. 1 O-ring seal, which can prevent hydrogen and oxygen from leaking between the main electrode plate and the annular resin electrode frame. Attached Figure Description

[0026] Figure 1 This is a schematic cross-sectional view of the bipolar plate structure of the alkaline hydrogen production electrolyzer provided in the embodiments of this application.

[0027] Figure 2 An exploded view of the bipolar plate structure of the alkaline hydrogen production electrolyzer provided in the embodiments of this application.

[0028] Figure 3 This is an overall schematic diagram of the bipolar plate structure of the alkaline hydrogen production electrolyzer provided in the embodiments of this application.

[0029] Figure 4 for Figure 3 Exploded view of area A in the middle.

[0030] Figure 5 This is a simplified simulation diagram of the bipolar plate structure of the alkaline hydrogen production electrolyzer provided in the embodiments of this application when connected in series.

[0031] Figure 6 This is a schematic diagram from one perspective of the annular resin electrode frame and diaphragm of the bipolar plate structure of the alkaline hydrogen production electrolyzer provided in an embodiment of this application.

[0032] Figure 7 This is another schematic diagram of the annular resin electrode frame and diaphragm of the bipolar plate structure of the alkaline hydrogen production electrolyzer provided in the embodiments of this application.

[0033] Figure 8 This is a schematic diagram of an electrolytic cell provided in an embodiment of this application.

[0034] Figure 9 The structure of the bipolar plate in an existing alkaline hydrogen electrolyzer is shown.

[0035] Figure 10 This is a schematic diagram of an existing electrolytic cell assembly.

[0036] Figure 11 This is a schematic diagram illustrating the damage to an existing diaphragm caused by tearing and compression of the gasket during electrolysis.

[0037] Figure 12 This is a schematic diagram of the creep that occurs in existing gaskets during electrolysis.

[0038] Figure 13 This is a schematic diagram illustrating alkali leakage caused by poor sealing between the electrode frames in the existing electrolysis process.

[0039] Figure 14 This is a schematic diagram showing the damage to the gasket and diaphragm after actual electrolysis operations, based on the existing electrode frame, diaphragm, and gasket.

[0040] Figure 15 This is a schematic diagram of the corrosion of the existing electrode frame and electrode plate.

[0041] Figure 16 This is a schematic diagram showing the corrosion of the channels in an existing polar frame.

[0042] Figure 17 This is a schematic diagram showing corrosion at the weld between the existing pole frame and the pole plate.

[0043] Figure 18 This is a schematic diagram of measurements taken before assembly of an existing polar frame diaphragm.

[0044] The diagram is labeled as follows: 1. Annular resin electrode frame; 2. Diaphragm; 3. Main electrode plate; 4. Electrode; 5. Support assembly; 6. Hydrogen liquid channel; 7. Oxygen liquid channel; 11. Annular frame body; 12. Limiting buckle; 13. Groove; 301. Hole No. 1; 302. Hole No. 2; 121. Post No. 1; 122. Protrusion; 8. O-ring No. 1; 9. O-ring No. 2; 101. Hydrogen liquid flow channel; 102. Oxygen liquid flow channel; 103. Alkali liquid flow channel; 14. Connecting assembly; 15. Conductive bus No. 1; 16. Conductive bus No. 2; 17. Pressure plate No. 1; 18. Pressure plate No. 2; 181. Liquid inlet; 182. Hydrogen liquid outlet; 183. Oxygen liquid outlet; 19. Alkali liquid channel. Detailed Implementation

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] like Figure 1 , Figure 2 and Figure 3 As shown, the embodiments of this application provide a bipolar plate structure for an alkaline hydrogen production electrolyzer, including an annular resin electrode frame 1 with a circular hole, a diaphragm 2 fused to the annular resin electrode frame 1 through the inner wall of the circular hole, two main electrode plates 3 respectively disposed on both sides of the annular resin electrode frame 1, two electrodes 4 respectively disposed on both sides of the diaphragm 2, and two support meshes 5. The two main electrode plates 3, the annular resin electrode frame 1, and the two electrodes 4 form two chambers. The two main electrode plates 3 and the two sides of the annular resin electrode frame 1 respectively form hydrogen liquid flow channels 101 and oxygen liquid flow channels 102 that are respectively connected to the two chambers. The two main electrode plates 3 and the annular resin electrode frame 1 form hydrogen liquid channels 6 connected to hydrogen liquid channels 101 and oxygen liquid channels 7 connected to oxygen liquid channels 102. The two support meshes 5 are respectively located in the two chambers, such that the two sides of the support meshes 5 in the chambers abut against the electrodes 4 and the main electrode plates 3 respectively.

[0047] It should be noted that the two chambers are the cathode chamber and the anode chamber, respectively. The cathode chamber produces hydrogen gas during electrolysis, and the anode chamber produces oxygen gas during electrolysis. Hydrogen gas enters the hydrogen liquid channel 6 along the hydrogen liquid flow channel 101, and oxygen gas enters the oxygen liquid channel 7 along the oxygen liquid flow channel 102. The diaphragm 2 is also made of resin material, the same as the annular resin electrode frame 1.

[0048] During actual electrolysis, the two electrodes 4 are the cathode and anode, respectively. The chamber forming the cathode produces hydrogen gas, and the chamber forming the anode produces oxygen gas. The oxygen and hydrogen gas are discharged through the gas-liquid discharge holes of the two main electrode plates 3, respectively. Since the annular resin electrode frame 1 and the diaphragm 2 are integrated, the oxygen and hydrogen gas in the two chambers are not easy to leak along the connection between the annular resin electrode frame 1 and the diaphragm 2, thereby eliminating the internal leakage problem of the electrolytic cell to the greatest extent.

[0049] In the above design, the diaphragm 2 and the annular resin electrode frame 1 can be fused together, thereby isolating the two chambers, greatly eliminating the problem of internal leakage in the electrolytic cell, reducing the risk of hydrogen-oxygen cross-contamination, and improving the safety of the electrolysis process.

[0050] Specifically: such as Figure 4 and Figure 5 As shown, the annular resin electrode frame 1 includes an annular frame body 11, a plurality of limiting buckles 12 disposed on one side of the annular frame body, and a plurality of grooves 13 disposed on the other side of the annular frame body 11 corresponding to the limiting buckles 12. The limiting buckles 12 can be projected along the axial direction of the annular frame body 11 into the corresponding grooves 13. The main electrode plate 3 is provided with a plurality of through holes that cooperate with the limiting buckles 12.

[0051] In actual use, a main electrode plate 3 is set between the two annular resin electrode frames 1. The limiting buckle 12 of the annular resin electrode frame 1 located on one side of the main electrode plate 3 passes through the through hole to limit the main electrode plate 3 and then extends into the groove 13 of the other annular resin electrode frame 1.

[0052] In the above design, the structural design and specific implementation of the annular resin pole frame 1 and the main pole plate 3 facilitate the series connection between the main pole plate 3 and the annular resin pole frame 1 in practical applications, and facilitate the positioning of the annular resin pole frame 1 and the main pole plate 3.

[0053] Specifically: such as Figure 4 As shown, the limiting buckle 12 includes a first post 121 connected to the annular resin frame body and a protrusion 122 disposed at the end of the first post 121 and extending along the outer side away from the annular frame body 11. The distance between the protrusion 122 and the annular resin frame body is greater than the thickness of the main electrode plate 3. The through hole includes a first hole 301 and a second hole 302 that are conductive. Both the first post 121 and the protrusion 122 can pass through the first hole 301. The first post 121 can pass through the second hole 302. The protrusion 122 cannot pass through the second hole 302.

[0054] In actual use, when it is necessary to position the annular resin pole frame 1 and the corresponding main pole plate 3, the first post 121 and the protrusion 122 pass through the first hole 301, so that the first post 121 can slide along the second hole 302. Then, rotate the main pole plate 3 or the annular resin pole frame 1 so that the first post 121 slides from the first hole 301 into the second hole 302. At this time, the protrusion 122 is located outside the second hole 302 and corresponds to the end face of the main pole plate 3. That is, the protrusion 122 and the annular resin frame body are located on both sides of the main pole plate 3.

[0055] In the above design, the structural design of the limiting buckle 12 and the through hole facilitate the positioning of the annular resin pole frame 1 and the main pole plate 3.

[0056] Specifically, the protrusion 122 is a plane on the side opposite to the annular resin frame body.

[0057] After actual assembly, the two sides of the main electrode plate 3 correspond to the annular resin frame body and the protrusion 122 respectively, and the side of the protrusion 122 opposite to the annular resin frame body will contact the main electrode plate 3.

[0058] In the above design, the planar design of the protrusion 122 and the specific implementation method make it easy to ensure that the surface of the main electrode plate 3 will not be scratched when the main electrode plate 3 is in contact.

[0059] Specifically: such as Figure 1 and Figure 2 As shown, a first sealing assembly and a second sealing assembly are respectively provided between the annular resin pole frame 1 and the two main pole plates 3.

[0060] In actual use, the sealing between the two main electrode plates 3 and the two sides of the annular resin electrode frame 1 can be achieved through the No. 1 sealing component and the No. 2 sealing component.

[0061] In the above design, the No. 1 sealing component and the No. 2 sealing component can prevent the gas generated during the electrolysis process from leaking between the main electrode plate 3 and the annular resin electrode frame 1.

[0062] Specifically: such as Figure 1 and Figure 2 As shown, the first sealing component is a first O-ring 8, the second sealing component is a second O-ring 9, and the annular resin frame 1 has a first annular groove for installing the first O-ring 8 and a second annular groove for installing the second O-ring 9 on both sides.

[0063] In actual use, the two main electrode plates 3 respectively compress the first O-ring 8 and the second O-ring 9, so that the deformation of the first O-ring 8 and the second O-ring 9 fills the height difference between the two main electrode plates 3 and the annular resin electrode frame 1.

[0064] In the above design, O-rings are used as the first and second sealing components, which facilitates assembly.

[0065] Specifically: such as Figure 1 As shown in the figure, the circular hole, the first O-ring 8 and the second O-ring 9 are concentric, the diameter of the first O-ring 8 is smaller than the diameter of the second O-ring 9, and the hydrogen liquid channel 6 and the oxygen liquid channel 7 are located on both sides of the first O-ring 8.

[0066] In actual use, hydrogen flows out from the hydrogen liquid channel 6, and oxygen flows out along the oxygen liquid channel 7. Because the main electrode plate 3 and the annular resin electrode frame 1 are not completely sealed, hydrogen entering the hydrogen liquid flow channel 101 may partially enter the gap between the main electrode plate 3 and the annular resin electrode frame 1. Similarly, oxygen entering the oxygen liquid flow channel 102 may partially enter the gap between the main electrode plate 3 and the annular resin electrode frame 1. The first O-ring seal 8 prevents leakage of hydrogen and oxygen between the main electrode plate 3 and the annular resin electrode frame 1. The second O-ring seal 9 isolates external gases from entering the hydrogen liquid channel 6 and the oxygen liquid channel 7 of the bipolar plate structure of the alkaline hydrogen electrolyzer of this application.

[0067] In the above design, the design of the first O-ring 8 and the second O-ring 9 facilitates the improvement of the overall sealing performance of the device and maximizes the isolation of hydrogen and oxygen from cross-contamination.

[0068] The second embodiment provided in this application is an alkaline electrolyzer, including several bipolar plate structures of an alkaline hydrogen production electrolyzer, and further including a first pressure plate 17, a second pressure plate 18, a first conductive bus 15, a second conductive bus 16, and several connecting components 14 connecting the first pressure plate 17 and the second pressure plate 18. The first pressure plate 17 is provided with a hydrogen liquid outlet 182 corresponding to the hydrogen liquid channel 6, an oxygen liquid outlet 183 corresponding to the oxygen liquid channel 7, and an alkaline liquid channel 19. The corresponding inlet 181, the first pressure plate 17 is provided with a hydrogen liquid transition through hole corresponding to the hydrogen liquid channel 6, an oxygen liquid transition through hole corresponding to the oxygen liquid channel 7, and an inlet transition hole corresponding to the alkaline liquid channel 19. After several of the alkaline hydrogen production electrolysis cell bipolar plate structures are stacked, the two outermost main electrode plates 3 are respectively abutted by the first conductive busbar 15 and the second conductive busbar 16. The first pressure plate 17 and the second pressure plate 18 respectively press the outer sides of the first conductive busbar 15 and the second conductive busbar 16. It should be noted that the connecting assembly 14 is a bolt and nut assembly, and the first pressure plate 17 and the second pressure plate 18 are provided with connecting holes that cooperate with the connecting assembly 14.

[0069] In actual use, the electrolyte (alkaline solution) is connected to the inlet 181 through the electrolyte supply mechanism, to the hydrogen outlet 182 through the hydrogen separator, and to the oxygen outlet 183 through the oxygen separator. The electrolyte (alkaline solution) flowing out of the supply mechanism passes through the inlet 181 and the inlet transition port, and then flows along the alkaline solution channel 19 of the bipolar plate structure of each alkaline hydrogen production electrolyzer, and then along the alkaline solution flow channel 103 into each chamber. Electrolysis occurs in each chamber. The electrolyte and hydrogen generated after electrolysis in the cathode chamber flow along the corresponding hydrogen solution flow channel 101 into the hydrogen solution channel 6, and then flow back to the hydrogen separator through the hydrogen solution transition hole and the hydrogen outlet 182. The electrolyte and oxygen generated after electrolysis in the anode chamber flow along the corresponding oxygen solution flow channel 102 into the oxygen solution channel 7, and then flow along the oxygen solution transition hole into the oxygen outlet 183 and into the oxygen separator.

[0070] In the above design, the structural design and specific implementation of the alkaline electrolytic cell ensure that the diaphragm 2 and the annular resin electrode frame 1 will not detach during the electrolysis process, thereby effectively isolating the two chambers from mutual crosstalk.

[0071] In further detail, it should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bipolar plate structure for an alkaline hydrogen production electrolyzer, characterized in that: The device includes an annular resin electrode frame (1) with a circular hole, a diaphragm (2) fused to the annular resin electrode frame (1) through the inner wall of the circular hole, two main electrode plates (3) respectively disposed on both sides of the annular resin electrode frame (1), and two electrodes (4) respectively disposed on both sides of the diaphragm (2). The two main electrode plates (3), the annular resin electrode frame (1), and the two electrodes (4) form two chambers. The two main electrode plates (3) respectively form two chambers with both sides of the annular resin electrode frame (1). The chambers are respectively connected by a hydrogen liquid flow channel (101) and an oxygen liquid flow channel (102). The two main electrode plates (3) form alkaline liquid flow channels (103) connected to the two chambers respectively on both sides of the annular resin electrode frame (1). The two main electrode plates (3) and the annular resin electrode frame (1) form a hydrogen liquid channel (6) connected to the hydrogen liquid flow channel (101), an oxygen liquid channel (7) connected to the oxygen liquid flow channel (102), and an alkaline liquid channel (19) connected to the alkaline liquid flow channel (103).

2. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 1, characterized in that: It also includes two support components (5), which are located in the two chambers respectively, such that the two sides of the support components (5) located in the chambers abut against the electrode (4) and the main electrode plate (3) respectively.

3. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 2, characterized in that: The support component (5) is a nickel mesh.

4. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 1, characterized in that: The annular resin pole frame (1) includes an annular frame body (11), a number of limiting buckles (12) disposed on one side of the annular frame body, and a number of grooves (13) disposed on the other side of the annular frame body (11) corresponding to the limiting buckles (12). The limiting buckles (12) can be projected along the axial direction of the annular frame body (11) into the corresponding grooves (13). The main pole plate (3) is provided with a number of through holes that cooperate with the limiting buckles (12).

5. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 4, characterized in that: The limiting buckle (12) includes a first post (121) connected to the annular resin frame body and a protrusion (122) located at the end of the first post (121) and extending along the outer side away from the annular frame body (11). The distance between the protrusion (122) and the annular resin frame body is greater than the thickness of the main electrode plate (3). The through hole includes a first hole (301) and a second hole (302) that are conductive. Both the first post (121) and the protrusion (122) can pass through the first hole (301). The first post (121) can pass through the second hole (302). The protrusion (122) cannot pass through the second hole (302).

6. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 5, characterized in that: The protrusion (122) is flat on one side relative to the annular resin frame body.

7. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 1, characterized in that: A first sealing assembly and a second sealing assembly are respectively provided between the annular resin pole frame (1) and the two main pole plates (3).

8. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 7, characterized in that: The first sealing component is a first O-ring (8), and the second sealing component is a second O-ring (9). The annular resin pole frame (1) is provided with a first annular groove for installing the first O-ring (8) and a second annular groove for installing the second O-ring (9) on both sides.

9. The bipolar plate structure of the alkaline hydrogen production electrolyzer according to claim 8, characterized in that: The circular hole, the first O-ring (8) and the second O-ring (9) are concentric. The diameter of the first O-ring (8) is smaller than the diameter of the second O-ring (9). The hydrogen liquid channel (6) and the oxygen liquid channel (7) are located on both sides of the first O-ring (8).

10. An alkaline electrolyzer, comprising a bipolar plate structure for alkaline hydrogen production electrolyzers as described in any one of claims 1 to 7, characterized in that: It also includes a first pressure plate (17), a second pressure plate (18), a first conductive busbar (15), a second conductive busbar (16), and several connecting components (14) connecting the first pressure plate (17) and the second pressure plate (18). The first pressure plate (17) is provided with a hydrogen liquid outlet (182) corresponding to the hydrogen liquid channel (6), an oxygen liquid outlet (183) corresponding to the oxygen liquid channel (7), and an inlet (181) corresponding to the alkali liquid channel (19). The first pressure plate (17) is provided with The alkaline hydrogen electrolyzer has a hydrogen liquid transition through hole corresponding to the hydrogen liquid channel (6), an oxygen liquid transition through hole corresponding to the oxygen liquid channel (7), and an inlet transition hole corresponding to the alkaline liquid channel (19). After the bipolar plate structures of the alkaline hydrogen production electrolyzer are stacked, the two outermost main plates (3) are abutted by the first conductive bus (15) and the second conductive bus (16) respectively. The first pressure plate (17) and the second pressure plate (18) press the outer sides of the first conductive bus (15) and the second conductive bus (16) respectively.

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