Preparation method of polymer pole frame electrolytic cell for hydrogen production by alkaline electrolysis of water

Abstract

The invention discloses a preparation method of a polymer pole frame electrolytic cell for hydrogen production by alkaline electrolysis of water. Comprising the following steps: processing a pole frame, a sealing gasket, a pole plate sealing gasket and a concave-convex pole plate; a diaphragm, an electrode, a sealing gasket, a concave-convex polar plate, a polar plate sealing gasket and a polar frame are sequentially placed as a small chamber; after the required number of the small chambers is reached, the two end plates are mounted and locked through bolts after the electrifying rings are mounted; and the bolts are fastened for multiple times to complete the assembly of the electrolytic cell. According to the invention, aiming at the relation setting of the polar plate salient point, the thickness of the sealing gasket and the compression amount of the sealing gasket and the setting of the polar plate edge fixing clamping point, the distance between the polar plate salient point and the electrode in the polymer electrolytic bath is minimized, the transmission efficiency of electric energy in the electrolytic bath is improved, the energy consumption is reduced, and the hydrogen production effect is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrolytic cell processing, and specifically relates to a method for preparing a polymer pole frame electrolytic cell for producing hydrogen by alkaline water electrolysis. Background Art

[0002] Hydrogen, as a zero-carbon energy carrier, has gained widespread attention. Hydrogen is the most abundant element on Earth, but free hydrogen in its natural state is relatively scarce. Therefore, a certain hydrogen production technology is needed to prepare hydrogen on a large scale from hydrogen-containing raw materials to meet the growing demand for hydrogen. Currently, the main green hydrogen production technology is water electrolysis, which is alkaline water electrolysis hydrogen production technology.

[0003] The alkaline water electrolysis hydrogen production electrolyzer adopts a structure in which the plate and the electrode are separated. The bipolar plate is mostly made of carbon steel, nickel or stainless steel with nickel electroplating treatment on the surface. The structural design of the plate will also affect the electrode resistance of the alkaline water hydrogen production electrolyzer. On the one hand, because the closer the contact between the plate and the electrode and the more contact points, the faster the current transmission; on the other hand, the convex-concave structure surface constitutes the internal cavity and circulation channel of the electrolysis unit, so that the electrolyte cannot flow directly upward when entering the electrolysis unit plate flow channel, increasing the disturbance of the electrolyte inside the electrolysis cell, increasing the mass transfer and heat transfer of the electrolyte in the electrolysis cell, and during the electrolysis process, bubbles will continue to precipitate from the electrode surface on the hydrogen and oxygen sides and gather into large bubbles, which will cause the resistance in the electrolyte to increase. The porous structure between the plate and the electrode will reduce the probability of large bubbles forming in the electrolyte, reduce the influence of the three-phase interface resistance, and weaken the influence of bubbles on the current density.

[0004] The dimensions of the various structures in the chamber of the existing alkaline water electrolysis hydrogen production electrolyzer are affected by working conditions and installation methods, resulting in differences in the design of the plate bumps and electrodes in the electrolyzer, which further affects the transmission efficiency of the electrical energy in the electrolyzer. Summary of the invention

[0005] In view of the problems existing in the background technology, the present invention provides a method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis, and the technical solution includes:

[0006] Processing pole frames, sealing gaskets, pole plate sealing gaskets and concave and convex pole plates;

[0007] The diaphragm, electrode, sealing gasket, concave and convex electrode plate, electrode plate sealing gasket and electrode frame are sequentially placed as a small chamber;

[0008] After reaching the required number of chambers, install the power-on coil and then install the two end plates with bolts and tighten them;

[0009] The bolts are tightened several times to complete the assembly of the electrolytic cell.

[0010] The dimensions of the chamber shall comply with:

[0011] d×80%+z+a2×80%=c;

[0012] (a1-b1-b2+a2)×80%=h;

[0013] b1=x×0.9, b2=y;

[0014] The thickness of the diaphragm is x, the thickness of the electrode is y, the thickness of the concave-convex plate is z, the protrusion height of the concave-convex plate is h, the thickness of the plate sealing gasket is d, the thickness of the small disc of the sealing gasket is a2, the compression ratio of the plate sealing gasket and the sealing gasket after being assembled into an electrolytic cell is n, the depth of the diaphragm placement area is b1, and the thickness of the electrode placement area is b2; the sealing gasket includes a large disc and a small disc.

[0015] After the electrolytic cell is assembled, nitrogen is introduced into the electrolytic cell for a 12-hour pressure test at 2 MPa. After 12 hours, the pressure remains unchanged.

[0016] The pole frame, the sealing gasket and the pole plate sealing gasket are prepared by machining or injection molding;

[0017] The processing process of the concave-convex plate is as follows: firstly, the carbon steel plate is laser cut to process the concave-convex plate prototype; then, the concave-convex plate prototype is placed in a stamping die for stamping, cleaning, drying, and then surface electroplating treatment is performed to obtain the concave-convex plate;

[0018] The punching pressure during the punching process of the electrode plate is 1-5 MPa;

[0019] The forming time of the electrode plate during the electrode plate stamping process is 20 to 50 seconds;

[0020] The holding time of the electrode plate during the electrode plate stamping process is 1 to 5 seconds;

[0021] After the pole plate is punched and formed, the surface of the pole plate is subjected to nickel electroplating.

[0022] The pole frame is provided with a liquid inlet and a separate air outlet; the pole frame is made of polymer material.

[0023] The polymer material is one of polysulfone, polyphenylsulfone and polyetheretherketone.

[0024] When the pole frame is prepared by injection molding, the hourly liquid inlet flow of the polymer pole frame is more than 3 times the volume of the electrolyte in the small chamber, and the size of the liquid inlet of the polymer pole frame is set according to this flow rate; the mold needs to be heated before the polymer pole frame is prepared by injection molding, and the mold temperature during the injection molding process is between 150°C and 210°C; the melt temperature during the injection molding process is between 330°C and 400°C; the single injection time during the injection molding process varies with the size of the pole frame and is between 1s and 100s; after the injection molding is completed, a pressure holding treatment is performed, and the pressure holding pressure is 85% to 98% of the injection molding pressure; the pressure holding time after the injection molding is completed is 5s to 12s.

[0025] The electrodes are commercial electrodes with a thickness of 0.3 mm to 1 mm; the diaphragms are commercial polyphenylene sulfide diaphragms or composite diaphragms with a thickness of 0.4 mm to 0.8 mm.

[0026] The sealing gasket and the plate sealing gasket are made of one of EPDM rubber, fluororubber and polytetrafluoroethylene.

[0027] The multiple tightening is three tightenings, including:

[0028] Step A: First, pre-tighten the bolts. After pre-tightening, use an electric torque wrench to set a force of 60 N·m to tighten again.

[0029] Step B, then use an electric torque wrench to set parameters for secondary tightening and let it rest for a while, then use a vernier caliper to measure the minimum distance between the opposing end plates, and the distance between the end plates is greater than 152.8 mm;

[0030] Step C: Increase the torque set by the electric torque wrench and tighten again until the distance between the end plates is tightened to 152.8 mm, completing the assembly of the electrolytic cell.

[0031] The beneficial effects of the present invention are:

[0032] 1. Due to the setting of the relationship between the plate protrusions, the thickness of the sealing gasket, the compression amount of the sealing gasket, and the setting of the fixing points on the edge of the plate in the present invention, the distance between the plate protrusions and the electrodes in the polymer electrolyzer is minimized, the transmission efficiency of the electric energy in the electrolyzer is improved, the energy consumption is reduced, and the hydrogen production effect is effectively improved.

[0033] 2. The present invention replaces the pole frame material from metal to polymer material, which reduces the weight of the traditional alkaline water electrolysis hydrogen production electrolyzer and the difficulty of electrolyzer assembly, and can improve the production efficiency of the alkaline water electrolysis hydrogen production electrolyzer.

[0034] 3. The present invention adopts injection molding or machining to reduce the welding steps in the traditional metal pole frame / plate connection process, so that the nickel plating on the surface of the pole plate is completely retained, the corrosion problem of the pole plate caused by high-temperature alkaline solution is improved, and the safety and stability of the alkaline water electrolysis hydrogen production electrolyzer during operation can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a schematic flow chart of an embodiment of a method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis.

[0036] Figure 2 It is the size code of each component of a single chamber in the embodiment of the present invention.

[0037] Figure 3 The figure is a schematic diagram of the explosion structure of an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the structure of the embodiment of the present invention after installation.

[0039] Figure 5 This is a schematic front view of an embodiment of the present invention after installation.

[0040] Figure 6 This is a schematic diagram of the main view of the installed physical object of the embodiment of the present invention.

[0041] Among them, 1-end plate, 2-pole frame, 3-concave and convex pole plates, 4-sealing gasket, 5-sealing gasket, 6-electrode, 7-diaphragm, 8-power-carrying circle. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0043] like Figure 1 The embodiment of the present invention shown includes:

[0044] Step 1, processing a pole frame 2, a sealing gasket 4, a pole plate sealing gasket 5 and a concave-convex pole plate 3;

[0045] Step 2, sequentially place the diaphragm 7, the electrode 6, the sealing gasket 4, the concave and convex plate 3, the plate sealing gasket 5 and the pole frame 2 as a small chamber, such as Figure 2 As shown;

[0046] Step 3: After reaching the required number of chambers, install the power ring 8 and finally install the two end plates 1 with bolts and lock them; the position is as follows Figure 3 As shown;

[0047] Step 4: Tighten the bolts several times to complete the assembly of the electrolytic cell. Figures 4 to 6 shown.

[0048] The processing process of the concave-convex pole plate 3 in step 1 is: firstly, the carbon steel plate is laser cut to process the prototype of the concave-convex pole plate 3; then, the prototype of the concave-convex pole plate 3 is placed in a stamping die for stamping, cleaning, drying, and then surface electroplating treatment is performed to obtain the concave-convex pole plate 3.

[0049] The preparation method of the pole frame 2, the sealing gasket 4 and the pole plate sealing gasket 5 in step 1 is: preparing by machining or injection molding;

[0050] In step 1, the stamping process of the concave and convex pole plate 3 is a one-time stamping process, the mold is not disassembled and turned over, a pole plate placement area is provided in the mold, and a single stamping mold is provided with a uniformly distributed convex stamping head; the stamping pressure during the pole plate stamping process is 1-5Mpa; the forming time during the pole plate stamping process is 20-50s; the holding time during the pole plate stamping process is 1-5s; after the pole plate stamping, the surface of the pole plate is electroplated with nickel; in this embodiment, specifically:

[0051] Step 11, using laser cutting to cut 1.5 mm thick carbon steel according to the shape structure of the integrated concave-convex pole plate 3, processing the prototype of the concave-convex pole plate 3, and the effective diameter of the pole plate is 160 mm;

[0052] Step 12, placing the 1.5 mm thick carbon steel concave-convex electrode plate prototype cut by laser into a stamping die to obtain a concave-convex electrode plate 3;

[0053] Step 13, set the stamping parameters, stamping pressure 1Mpa, forming time 40s, holding time 2s;

[0054] Step 14: Take out the stamped concave-convex electrode plate 3, use alcohol to clean the surface of the integrated concave-convex electrode plate 3, dry it after cleaning, and perform surface electroplating treatment.

[0055] One side of the pole frame 2 is provided with a step for accommodating the small disc in the sealing gasket 4, the edge of the concave and convex pole plate 3 and the pole plate sealing gasket 5, and the other side is provided with a step for accommodating 6, and both steps are located in the inner diameter direction of the pole frame 2.

[0056] The material of the pole frame 2 is a polymer material; the polymer pole frame material is one of polysulfone (PSU), polyphenylsulfone (PPSU) and polyetheretherketone (PEEK); the polymer pole frame is prepared by injection molding or machining; the polymer pole frame is provided with a liquid inlet and a separate gas outlet; the hourly liquid inlet flow of the polymer pole frame is more than 3 times the volume of the electrolyte in the small chamber, and the size of the polymer pole frame liquid inlet is set according to this flow; the mold needs to be heated before the polymer pole frame is prepared by injection molding, and the mold temperature during the injection molding process is between 150°C and 210°C; injection The melt temperature during the molding process is between 330℃ and 400℃; the single injection time during the injection molding process varies with the pole frame size and is between 1s and 100s; after the injection molding is completed, the pressure holding treatment is performed, and the pressure holding pressure is 85% to 98% of the injection molding pressure; the pressure holding time after the injection molding is completed is 5s to 12s; the polymer pole frame is prepared by injection molding, and the upper and lower errors need to be set in accordance with the matching combination form; the electrode uses a commercial electrode with a thickness of 0.3mm to 1mm; the diaphragm uses a commercial polyphenylene sulfide (PPS) diaphragm or a composite diaphragm with a thickness of 0.4mm to 0.8mm;

[0057] The electrode plate sealing gasket 5 is a circular ring structure, and the thickness of the electrode plate sealing gasket 5 is set in coordination with the height of the concave-convex electrode plate 3 and the compression rate of the electrode plate sealing gasket 5 .

[0058] The sealing gasket 4 includes a large disc and a small disc, the thickness of the large disc is a1, and the thickness of the small disc is a2; the small disc contacts one end surface of the concave-convex pole plate 3, and the thickness of the large disc is related to the protruding height of the concave-convex pole plate and the compression rate of the sealing gasket.

[0059] The plate gasket is a circular ring structure of a certain thickness, and its thickness is related to the protrusion height of the concave-convex plate and the compression rate of the plate gasket. Specifically, the thickness of the diaphragm 7 is x, the thickness of the electrode 6 is y, the thickness of the concave-convex plate 3 is z, the protrusion height of the concave-convex plate 3 is h, the thickness of the plate gasket 5 is d, and the thickness of the small disc of the sealing gasket 4 is a2. The compression ratio of the plate gasket 5 and the sealing gasket 4 after being assembled into an electrolytic cell is n;

[0060] Among them, d×80%+z+a2×80%=c;

[0061] In a further implementation of this embodiment, a diaphragm placement area and an electrode placement area are provided on the large disk, the depth of the diaphragm placement area is b1, and the thickness of the electrode placement area is b2;

[0062] Among them, (a1-b1-b2+a2)×80%=h;

[0063] b1=x×0.9, b2=y.

[0064] The pole frame 2 is provided with a liquid inlet and a gas outlet;

[0065] In order to ensure that the positions of the liquid inlet, the gas outlet and the diaphragm pressing area are not misaligned during the assembly of the electrolytic cell, four positioning holes are evenly distributed on the same diameter circle on the surface of the end plate 1.

[0066] The sealing gasket 4 and the plate sealing gasket 5 are made of one of EPDM rubber, fluororubber and polytetrafluoroethylene;

[0067] The material of the pole frame 2 is one of polysulfone, polyphenylsulfone and polyetheretherketone;

[0068] The diaphragm 7 is a polyphenylene sulfide diaphragm or a composite diaphragm.

[0069] In a further implementation of this embodiment, the structure of the concave-convex plate 3 is a double-sided convex structure, a pair of fixed protrusions for determining the relative position of the plates are arranged at a certain position on the edge of the concave-convex plate 3, and corresponding card grooves are arranged on the small disc of the sealing gasket 4 and the plate sealing gasket 5;

[0070] The pole frame 2 is provided with a pole frame fixing groove corresponding to the fixing protrusion, and the fixing protrusion of the concave-convex pole plate 3 cooperates with the fixing groove of the pole frame 2 to fix the concave-convex pole plate 3 to form a circumferential limit during installation.

[0071] The multiple tightening in step 4 is at least three tightenings, including:

[0072] Step 41, first pre-tighten the bolts, and after pre-tightening, use an electric torque wrench to set a force of 60 N·m to tighten again;

[0073] Step 42, then use an electric torque wrench to set the parameters (also 60 N·m) for secondary tightening and let it rest for a period of time (at least 12 hours), and then use a vernier caliper to measure the minimum spacing between the opposite end plates. The spacing should be greater than 152.8 mm;

[0074] Step 42: Increase the torque set by the electric torque wrench for re-tightening (80 N·m), tighten the distance between the end plates to 152.8 mm, and complete the assembly of the electrolytic cell.

[0075] After step 4, the electrolytic cell was assembled and nitrogen was introduced to perform a 2 MPa pressure test for 12 hours. After 12 hours, the pressure remained unchanged, indicating that there was no leakage in the electrolytic cell.

[0076] The adjacent cells in the electrolytic cell are connected in a point-to-point manner (assuming that the plates in the adjacent cells are A / B, the convex point on the right side of A and the convex point on the left side of B need to be close to each other) to weaken part of the voltage drop, reduce the voltage pole of the cell, reduce the power loss during the operation of the electrolytic cell, and improve the gas production efficiency. For this purpose, a fixed point of the pole frame is set at a certain position on the edge of the plate;

[0077] Figure 2 The size codes of the components of a single chamber are as follows: the thickness of the diaphragm is x, the thickness of the electrode is y, the thickness of the concave-convex plate is z, the height of the concave-convex plate protrusion is h, the thickness of the plate gasket 5 is d, the thickness of the large disc of the sealing gasket 4 is a1, and the thickness of the small disc of the sealing gasket 4 is a2. After the sealing gasket and the sealing gasket are assembled into an electrolytic cell, they need to be compressed to a certain compression ratio based on the existing thickness (taking polytetrafluoroethylene material as an example, after the sealing gasket and the sealing gasket components are assembled into an electrolytic cell, they will be compressed to 80% of the original thickness).

[0078] The plate sealing gasket 5 is a circular ring structure with a certain thickness, and its thickness d is related to the convex and concave plate protrusion height h and the sealing gasket compression rate. At the same time, the sealing gasket 4 is a two-layer step disc structure with a certain thickness. The thickness of the small disc is related to the pole frame thickness and the sealing gasket compression rate, and the thickness of the large disc is related to the convex and concave plate protrusion height and the sealing gasket compression rate:

[0079] d×80%+z+a2×80%=c,

[0080] (a1-b1-b2+a2)×80%=h;

[0081] The sealing gasket disc is provided with a diaphragm placement area and an electrode placement area. The depth of the placement area is related to the thickness of the electrode and the diaphragm, etc.:

[0082] b1=x×0.9, b2=y.

[0083] according to Figure 1 When the present embodiment is actually operated, a polyetheretherketone (PEEK) electrode frame with an effective electrode diameter of 160 mm, a polytetrafluoroethylene sealing gasket and a sealing gasket are first machined according to the drawings, and a plate with a thickness of 1.5 mm and a single-sided raised height of 4.5 mm is prepared by a stamping process. Nickel-molybdenum fiber felt and nickel fiber felt are used as anode and cathode, and a PPS diaphragm is used. The polymer electrolyzer is assembled with end plates, insulating pads, fastening screws, disc springs, nuts, and insulating sleeves; the compression amount of the sealing gasket is set, and the physical model of the 12-chamber polymer electrolyzer is as follows: Figure 5 As shown, the distance between the two end plates after compression molding is 222±0.5mm, and at this time, the surface bumps of the plate in the small chamber and the electrodes achieve "0 spacing".

[0084] The actual picture of the 12-chamber polymer electrolyzer after assembly and tightening is shown in Figure 6. At this time, the distance between the two end plates is 222 mm, which meets the set distance.

[0085] The assembled polymer electrolyzer is connected to the electrolyzer test system at 1.6MPa, 95℃, 7000A / m 2After running for 4 hours, the cell voltage, oxygen in hydrogen and hydrogen in oxygen were measured, and the data were shown in the following table. There was no leakage in the polymer pole frame during operation, and the diaphragm was intact after the polymer electrolyzer was disassembled after operation. Due to the setting of the relationship between the plate bumps, the thickness of the sealing gasket, the compression of the sealing gasket, and the setting of the fixed card points on the edge of the plate in this patent, the plate bumps and the electrodes in the polymer electrolyzer achieve "0 spacing", which improves the transmission efficiency of the electric energy in the electrolyzer, reduces energy consumption, and effectively improves the hydrogen production effect; the plate sealing gasket 5 is set between the plate and the polymer pole frame, so that the polymer pole frame and the metal plate are sealed, which prevents the occurrence of gas cross-linking between adjacent chambers and improves the quality of the generated gas.

[0086] Operating pressure Chamber voltage Oxygen content in hydrogen Hydrogen content in oxygen Current density System temperature 1.6MPa 2.3V 0.1％ 0.6％ <![CDATA[7000A / m 2 ]]> 95℃

Claims

1. A method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis, characterized in that: include: Processing pole frames, sealing gaskets, pole plate sealing gaskets and concave and convex pole plates; The diaphragm, electrode, sealing gasket, concave and convex electrode plate, electrode plate sealing gasket and electrode frame are sequentially placed as a small chamber; After reaching the required number of chambers, install the power-on coil and then install the two end plates with bolts and tighten them; The bolts are tightened several times to complete the assembly of the electrolytic cell.

2. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The dimensions of the chamber shall comply with: d×80%+z+a2×80%=c; (a1-b1-b2+a2)×80%=h; b1=x×0.9, b2=y; The thickness of the diaphragm is x, the thickness of the electrode is y, the thickness of the concave-convex plate is z, the protrusion height of the concave-convex plate is h, the thickness of the plate sealing gasket is d, the thickness of the small disc of the sealing gasket is a2, the compression ratio of the plate sealing gasket and the sealing gasket after being assembled into an electrolytic cell is n, the depth of the diaphragm placement area is b1, and the thickness of the electrode placement area is b2; the sealing gasket includes a large disc and a small disc.

3. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: After the electrolytic cell is assembled, nitrogen is introduced into the electrolytic cell for a 12-hour pressure test at 2 MPa. After 12 hours, the pressure remains unchanged.

4. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The pole frame, the sealing gasket and the pole plate sealing gasket are prepared by machining or injection molding; The processing process of the concave-convex plate is as follows: firstly, the carbon steel plate is laser cut to process the concave-convex plate prototype; then, the concave-convex plate prototype is placed in a stamping die for stamping, cleaning, drying, and then surface electroplating treatment is performed to obtain the concave-convex plate; The punching pressure during the punching process of the electrode plate is 1-5 MPa; The forming time of the electrode plate during the electrode plate stamping process is 20 to 50 seconds; The holding time of the electrode plate during the electrode plate stamping process is 1 to 5 seconds; After the pole plate is punched and formed, the surface of the pole plate is subjected to nickel electroplating.

5. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The pole frame is provided with a liquid inlet and a separate air outlet; the pole frame is made of polymer material.

6. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 5, characterized in that: The polymer material is one of polysulfone, polyphenylsulfone and polyetheretherketone.

7. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 5 or 6, characterized in that: When the pole frame is prepared by injection molding, the hourly liquid inlet flow of the polymer pole frame is more than 3 times the volume of the electrolyte in the small chamber, and the size of the liquid inlet of the polymer pole frame is set according to this flow rate; the mold needs to be heated before the polymer pole frame is prepared by injection molding, and the mold temperature during the injection molding process is between 150°C and 210°C; the melt temperature during the injection molding process is between 330°C and 400°C; the single injection time during the injection molding process varies with the size of the pole frame and is between 1s and 100s; after the injection molding is completed, a pressure holding treatment is performed, and the pressure holding pressure is 85% to 98% of the injection molding pressure; the pressure holding time after the injection molding is completed is 5s to 12s.

8. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The electrodes are commercial electrodes with a thickness of 0.3 mm to 1 mm; the diaphragms are commercial polyphenylene sulfide diaphragms or composite diaphragms with a thickness of 0.4 mm to 0.8 mm.

9. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The sealing gasket and the plate sealing gasket are made of one of EPDM rubber, fluororubber and polytetrafluoroethylene.

10. The method for preparing a polymer pole frame electrolyzer for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The multiple tightening is three tightenings, including: Step A: First, pre-tighten the bolts. After pre-tightening, use an electric torque wrench to set a force of 60 N·m to tighten again. Step B, then use an electric torque wrench to set parameters for secondary tightening and let it rest for a while, then use a vernier caliper to measure the minimum distance between the opposing end plates, and the distance between the end plates is greater than 152.8 mm; Step C: Increase the torque set by the electric torque wrench and tighten again until the distance between the end plates is tightened to 152.8 mm, completing the assembly of the electrolytic cell.

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