Ball type main polar plate structure for producing hydrogen by electrolyzing water and preparation method of ball type main polar plate structure

Abstract

The invention relates to the technical field of hydrogen production through water electrolysis, in particular to a ball type main polar plate structure for hydrogen production through water electrolysis and a preparation method, and the ball type main polar plate structure comprises a metal ball with the surface subjected to electroplating treatment, a main polar plate with a plurality of ball grooves formed in the two sides, and a bipolar frame with circulation holes formed in the top and / or the bottom, the multiple metal balls are laid in the ball grooves in a flowing mode respectively, and the metal balls can be discharged out or poured into the ball grooves through the circulation holes. According to the invention, the ball grooves of the main pole plate are filled with the metal balls with catalytic activity, so that the contact area between assemblies can be greatly increased, the contact resistance of internal members of a small chamber is reduced, the effective catalytic area is increased, the flow of an electrolyte in the chamber is promoted, the electrolytic current density is greatly improved, and the energy consumption of hydrogen production by electrolysis of water is reduced; in addition, the manufacturing process is simplified, the manufacturing cost is reduced, after long-time work, the metal balls are discharged through the circulation holes and poured again, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a ball-type main pole plate structure for hydrogen production by electrolysis of water and a preparation method thereof. Background Art

[0002] At present, among the various methods of producing hydrogen, the one produced by electrolyzing water has the highest purity and is highly favored. Therefore, using an electrolyzer to electrolyze water to produce hydrogen is considered to be the main development direction of hydrogen production in the future. However, in a typical electrolyzer structure, it is mainly composed of several parts such as a tank body, a diaphragm, electrodes (positive and negative electrodes), plates, and a metal mesh. The electrolyzer usually connects multiple electrodes in series to form independent chambers. In an independent chamber of the electrolyzer, the plates are located on both sides of the metal mesh. Their function is to conduct electrons, make the electrolysis current density on the plates more uniform, and reduce the contact resistance between the plates and the metal mesh, increase the current density, and reduce the energy consumption of hydrogen production. The plates are at both ends of a complete chamber structure, forming chambers for the flow of electrolytes in the cathode region and the anode region, realizing the diversion of cathode electrolyte and anode electrolyte, reducing the content of oxygen in hydrogen and hydrogen in oxygen to a certain extent, and ensuring the safety of electrolysis operation.

[0003] Especially in the electrolytic chamber of the filter press electrolytic cell, the internal main electrode plate is selected to have a nipple structure (concave-convex structure) on the surface. These nipple structures enable the plates on both sides of the diaphragm to abut against each other through the top, forming a cavity and circulation channel for the electrolyte in the chamber. Although the heat and mass transfer inside the electrolytic cell can be enhanced, the liquid concentration can be balanced and the probability of large bubble formation can be reduced by changing the number of nipples on the nipple-type plate and adjusting the depth of the nipple, the more nipple structures the better. The increase in the number of nipple structures will directly lead to an increase in the stamping cost, and will also have an adverse effect on the mechanical strength of the main electrode plate. As for the depth of the nipple, the depth of the nipple is not necessarily the same. The increase in depth will increase the spacing between the electrolytic cell chambers, making the overall structure less compact and increasing the resistance of the chambers. At the same time, the manufacture of a deep mastoid structure requires a larger tonnage of the punching machine and a higher cost. Moreover, due to the long-term discharge of the electrolytic cell, the mastoid part on the main plate is prone to electrical corrosion at the contact point with the metal mesh, causing the mastoid part or even the main plate to be punctured, resulting in leakage between the chambers. Moreover, if the electrolytic cell body is not disassembled in time and the entire main plate is not replaced, the diaphragm will be damaged due to insufficient or uneven distribution of mastoids, resulting in direct contact between the electrodes on both sides, causing a short circuit, resulting in a decrease in the voltage of the chamber and a decrease in the purity of the gas, thereby increasing the maintenance cost of the equipment.

[0004] Based on this, the present invention proposes a ball-type main electrode plate structure and a preparation method for producing hydrogen by electrolyzing water. Summary of the invention

[0005] The purpose of the present invention is to provide a ball-type main pole plate structure for hydrogen production by electrolysis of water and a preparation method thereof. By filling metal balls with catalytic activity in the ball grooves of the main pole plates, the contact area between components can be greatly increased, the contact resistance of the internal components of the chamber can be reduced, the effective catalytic area can be increased, the flow of electrolyte in the chamber can be promoted, the electrolysis current density can be greatly increased, and the energy consumption of hydrogen production by electrolysis of water can be reduced. In addition, the preparation method of the ball-type main pole plate structure for hydrogen production by electrolysis of water of the present invention simplifies the manufacturing process and reduces the manufacturing cost. After working for a long time, the metal balls are discharged or refilled through the flow holes, which is convenient for the inspection and maintenance of the device, and further reduces the maintenance cost of the equipment.

[0006] In order to solve the above technical problems, the present invention provides a ball-type main pole plate structure for electrolyzing water to produce hydrogen, comprising metal balls with electroplating treatment on the surface, a main pole plate with a plurality of ball grooves on both sides, and a bipolar frame with flow holes on the top and / or bottom, wherein the main pole plate and the bipolar frame are both annular, the main pole plate is placed in the bipolar frame and the two are coaxially arranged, the metal balls are provided in a plurality and are respectively laid in the ball grooves in a flowable manner, the metal balls can be discharged or poured in through the flow holes, a plug for sealing is provided in the flow holes, and two exhaust ports and two liquid inlets are respectively provided at the top and bottom of the bipolar frame.

[0007] Preferably, the shape of the ball groove is square or semicircular.

[0008] Preferably, the plurality of ball grooves are distributed in both horizontal and vertical directions.

[0009] Preferably, a plurality of the ball grooves are distributed longitudinally, and an annular groove communicating with the ball grooves on the longitudinal outer sides is formed on the outer periphery of the main pole plate, and the annular groove is communicated with the flow hole.

[0010] Preferably, the metal ball has a solid structure and its surface is knurled.

[0011] Preferably, the metal ball is provided with one or more through holes, and any one of the through holes passes through the center of the metal ball.

[0012] On the other hand, the present invention also provides a method for preparing a ball-type main plate structure for producing hydrogen by electrolysis of water, and the preparation method comprises the following steps:

[0013] S1. Initial forming of metal balls

[0014] Stainless steel or nickel alloy is used as the material for making metal balls, which are sent to a high-speed forging machine to be cut into small pieces, and then pressed into a spherical shape in a forging die and then roughly ground in a ball mill;

[0015] S2. Electroplating of metal balls

[0016] A metal mesh is placed at the bottom of the electroplating tank, and the processed metal balls are evenly spread on the metal mesh after pretreatment, and then the metal electrolyte to be plated is injected, and finally the metal mesh is connected to the negative electrode of the power supply for electroplating, wherein the uniformity and thickness of the coating are controlled by the applied current and the electroplating time;

[0017] S3. Processing of main pole plate

[0018] According to the diameter and number of metal balls, ball grooves are processed on the double-side surfaces of the main pole plate in a longitudinal or transverse manner. After the ball grooves are processed, the main pole plate is subjected to nickel electroplating.

[0019] When only the ball groove is processed longitudinally, an annular groove connected to the flow hole on the bipolar frame is processed on the outer periphery of the main pole plate, and the annular groove is connected to each longitudinal outer ball groove;

[0020] S4. Processing of bipolar frame

[0021] Two exhaust ports and two liquid inlets are respectively processed on the top and bottom of the bipolar frame, and a flow hole with an inner diameter larger than the diameter of the metal ball is processed on the top and / or bottom of the bipolar frame, and a plurality of metal balls are discharged or poured in through the flow hole;

[0022] S5. Assembly of ball-type main plate structure

[0023] Weld the bipolar frame and the main pole plate together. When assembling the metal balls, keep the main pole plate level and evenly spread the metal balls into the ball groove on one side. Check whether the plug at the flow hole meets the sealing requirements and ensure that there is no blockage and accumulation of metal balls near the flow hole, and the metal balls can flow out smoothly from the flow hole.

[0024] Then the metal mesh is tightly fitted with the metal balls, and the diaphragm is assembled to the outside of the metal mesh and sealed with the bipolar frame through a sealing gasket, and the above operation is repeated to spread the metal balls to the ball grooves on the other side. After completing the assembly of the metal mesh and the diaphragm, the assembled ball-type main plate structure is used for hydrogen production by electrolysis of water, and multiple stages are connected in series according to the actual hydrogen production by electrolysis of water.

[0025] Preferably, in S1, the through hole is processed or not processed according to the diameter of the metal ball:

[0026] When no through-holes are processed, the surface of the solid metal ball is knurled to increase the surface roughness; when one or more through-holes are processed, any through-hole passes through the center of the ball to promote the flow of electrolyte and form turbulence.

[0027] Preferably, the pretreatment in S2 comprises soaking the metal ball in anhydrous ethanol and an acetic acid solution for 15 minutes each, with the aid of stirring or ultrasonic vibration to remove grease, metal residue and oxide film on the surface of the metal ball, and finally drying the metal ball;

[0028] The metal plating electrolyte is prepared by mixing ammonium chloride and nickel chloride hexahydrate. The electroplating deposition current is set to -0.25Acm-2, and the deposition time is 15min. After the deposition is completed, it is taken out, rinsed with ultrapure water and dried.

[0029] Preferably, the processing method of the flow hole in S4 is adjusted according to the thickness of the bipolar frame:

[0030] When the thickness of the bipolar frame is greater than twice the diameter of the metal ball, a flow hole is bored at the center of the top and / or bottom of the bipolar frame, the depth of the flow hole extends to contact the outermost metal ball of the main pole plate, and the metal ball can be smoothly discharged from the flow hole, the flow hole is a stepped hole structure, and an internal thread is processed in the stepped hole, and a plug is processed with the large hole diameter size of the stepped hole, and the flow hole is sealed by the plug;

[0031] When the thickness of the bipolar frame is between one and two times the diameter of the metal ball, a groove-shaped flow hole with a size larger than the diameter of the metal ball is processed on the inner surface of the top and / or bottom of the bipolar frame, and the metal ball can be smoothly discharged from the groove-shaped flow hole. At the same time, a plug with a size identical to that of the groove-shaped flow hole is processed, combined with a gasket, placed in the groove-shaped flow hole, and fastened with bolts on both sides of the bipolar frame to achieve a sealing effect.

[0032] The beneficial effects of the present invention are:

[0033] 1. The ball-type main pole plate structure for hydrogen production by electrolysis of water of the present invention can solve the defects of high power consumption and high device maintenance cost in hydrogen production by electrolysis of water in the prior art. By filling the metal balls with catalytic activity in the ball grooves of the main pole plate, the contact area between components can be greatly increased, the contact resistance of the internal components of the chamber can be reduced, the effective catalytic area can be increased, the flow of electrolyte in the chamber can be promoted, the electrolysis current density can be greatly increased, and the energy consumption of hydrogen production by electrolysis of water can be reduced. In addition, the preparation method of the ball-type main pole plate structure for hydrogen production by electrolysis of water of the present invention simplifies the manufacturing process and reduces the manufacturing cost. After working for a long time, the metal balls are discharged or refilled through the flow holes, which is convenient for the inspection and maintenance of the device, and further reduces the maintenance cost of the equipment.

[0034] Specifically, the present invention lays electroplated metal balls on both sides of the main pole plate, which not only improves the catalytic decomposition of water during the electrolysis of water to produce hydrogen, but also promotes the flow of electrolyte and the formation of turbulence when the electrolyte flows from the surface of the metal balls and the grooves of the balls, thereby improving the precipitation ability of the product gas; the metal balls in the ball grooves on the main pole plate can be rolled along the ball grooves to the flow holes for discharge by quickly removing the plugs during overhaul and maintenance, thereby improving the maintenance efficiency of convenient overhaul and replacement, and if the metal balls are corroded and the material fatigue occurs after long-term use, they only need to be discharged from the flow holes and filled with new metal balls. The present invention allows the operator to discharge or refill the metal balls on both sides of the main pole plate from the bottom and / or top flow holes without completely disassembling the electrolytic cell, without removing the main pole plate or the bipolar frame, thereby reducing the maintenance time and maintenance cost, and solving the problem in the prior art that the main pole plate with a mastoid structure needs to be removed from the bipolar frame during overhaul and maintenance, and the entire main pole plate needs to be replaced when problems occur, thereby increasing the maintenance time and maintenance cost;

[0035] In addition, the present invention can adapt to electrode meshes of different specifications by adjusting the diameter of the assembled metal balls, has a wide range of applications and high flexibility, and solves the problem in the prior art that the mastoid structure is formed by punching with a punching machine, and once the processing is completed, the depth of the mastoid cannot be changed, and it is not easy to adapt to electrodes of different specifications. Moreover, through the design of the metal balls, it can solve the problem in the prior art that the entire main electrode plate needs to be replaced after the mastoid is partially corroded. It only needs to remove the plug to discharge the metal balls from the flow hole and refill them with new metal balls. There is no need to replace the main electrode plate, which greatly improves the maintenance efficiency and reduces the maintenance cost.

[0036] 2. When the diameter of the metal ball of the present invention is less than 1 mm, in order to ensure the metal strength of the metal ball itself, no through hole can be processed, and knurling can be performed on the surface of the solid metal ball to increase the surface roughness, which can further promote the flow of electrolyte and the formation of turbulence, thereby improving the precipitation ability of the product gas; when the diameter of the metal ball is greater than 1 mm, one or more through holes can be opened on the metal ball, and any through hole passes through the center of the metal ball. Through the design of the through hole, the electrolyte not only passes through the surface of the metal ball, but also passes through the inside of the metal ball, which greatly promotes the flow of electrolyte and the formation of turbulence, thereby improving the precipitation ability of the product gas.

[0037] 3. The longitudinal or transverse bidirectional ball groove design of the present invention can facilitate the uniform distribution of metal balls and enable them to flow smoothly. They can all be collected at the flow holes for discharge, or the metal balls can be refilled from the flow holes to replace damaged metal balls, thereby reducing maintenance costs and increasing the service life of the main plates and the electrolytic cell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 Schematic diagram of the structure of an alkaline electrolyzer with a ball-type main electrode plate structure for producing hydrogen by electrolysis of water according to Example 1 of the present invention, which is applied to an ultra-short electrode distance;

[0040] Figure 2 is a schematic structural diagram of a bipolar frame according to Embodiment 1 of the present invention;

[0041] Figure 3 is a schematic structural diagram of a ball groove of a main pole plate of Embodiment 1 of the present invention;

[0042] Figure 4 1 is a schematic diagram of the solid structure of the metal ball and the structure of different through-hole states according to Example 1 of the present invention;

[0043] In the figure: 1-metal ball, 2-main pole plate, 3-bipolar frame, 4-plug, 5-electrode mesh, 6-diaphragm, 7-sealing gasket, 11-through hole, 21-ball groove, 31-circulation hole, 32-exhaust port, 33-liquid inlet, 211-longitudinally distributed ball groove, 212-laterally and vertically distributed ball groove. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Example 1

[0046] like Figure 1-4As shown, a ball-type main pole plate structure for producing hydrogen by electrolyzing water comprises a metal ball 1 with a surface treated by electroplating, a main pole plate 2 with a plurality of ball grooves 21 on both sides, and a bipolar frame 3 with flow holes 31 on the top and bottom. The main pole plate 2 and the bipolar frame 3 are both annular, the main pole plate 2 is placed in the bipolar frame 3 and the two are coaxially arranged, there are a plurality of metal balls 1 and they are laid in the ball grooves 21 in a flowable manner, the metal balls 1 can be discharged or poured in through the flow holes 31, a plug 4 for sealing is provided in the flow holes 31, and two exhaust ports 32 and two liquid inlets 33 are provided on the top and bottom of the bipolar frame 3, respectively. Of course, in other embodiments, according to actual needs, only flow holes can be provided on the top or bottom of the bipolar frame 3.

[0047] The ball-type main pole plate structure for water electrolysis hydrogen production of the present invention can solve the defects of high power consumption and high device maintenance cost in the prior art of water electrolysis hydrogen production. By filling the metal ball with catalytic activity in the ball groove of the main pole plate, the contact area between components can be greatly increased, the contact resistance of the internal components of the small chamber can be reduced, the effective catalytic area can be increased, the flow of electrolyte in the chamber can be promoted, the electrolysis current density can be greatly increased, the energy consumption of water electrolysis hydrogen production can be reduced, and the manufacturing process is simplified, the manufacturing cost is reduced, and after a long period of work, the metal ball is discharged or refilled through the flow hole, which is convenient for the maintenance of the device and further reduces the maintenance cost of the equipment;

[0048] Specifically, the present invention lays electroplated metal balls on both sides of the main pole plate, which not only improves the catalytic decomposition of water during the electrolysis of water to produce hydrogen, but also allows the metal balls in the ball grooves on the main pole plate to flow along the ball grooves to the flow holes for discharge by quickly removing the plugs during maintenance, thereby improving the maintenance efficiency of convenient maintenance and replacement. If the metal balls are corroded and fatigued after long-term use, they only need to be discharged from the flow holes and filled with new metal balls. The present invention allows the operator to discharge or refill the metal balls on both sides of the main pole plate from the bottom and / or top flow holes without removing the main pole plate or the bipolar frame when the electrolytic cell is not completely disassembled, thereby solving the problem in the prior art that the main pole plate with a mastoid structure needs to be removed from the bipolar frame during maintenance, and the entire main pole plate needs to be replaced when problems occur, which increases maintenance time and maintenance cost. When the present invention is used for electrolysis of water to produce hydrogen, when the electrolyte flows from the surface of the metal balls and the ball grooves, the electrolyte flow and turbulence are promoted, thereby improving the precipitation ability of the product gas.

[0049] In addition, the present invention can adapt to electrode meshes of different specifications by adjusting the diameter of the assembled metal balls, has a wide range of applications and high flexibility, and solves the problem in the prior art that the mastoid structure is formed by punching with a punching machine, and once the processing is completed, the depth of the mastoid cannot be changed, making it difficult to adapt to electrodes of different specifications.

[0050] Specifically, the shape of the ball groove 21 is square or semicircular, and the interior of the ball groove 21 can be finely processed according to actual needs. If necessary, simple grinding and polishing can be performed to reduce the roughness of the surface of the ball groove 21 to avoid blockage or serious wear on the surface of the metal balls during the subsequent filling of metal balls. The metal balls densely laid on the ball groove 21 should be evenly distributed and able to flow smoothly. Among them, the material of the main pole plate can be stainless steel or nickel alloy. After the ball groove 21 is processed, the entire main pole plate should be electroplated with nickel, and the nickel plating should completely cover the entire main pole plate.

[0051] Specifically, a plurality of ball grooves 21 are distributed in a longitudinal or transverse bidirectional manner, so that the metal balls in the ball grooves can be discharged from or refilled into the flow holes. Here, when only the longitudinally distributed ball grooves are processed, an annular groove connected to each longitudinal outer ball groove 21 needs to be opened on the outer periphery of the main pole plate 2. The annular groove is connected to the flow hole 31, so that the metal balls assembled in each longitudinal ball groove can be collected and discharged from the flow hole. In this embodiment, if Figure 3 As shown, a processing schematic diagram of the longitudinally distributed ball groove 211 and the transversely and longitudinally distributed ball groove 212 is shown, in which one of the transversely and longitudinally distributed ball grooves 212 is filled with metal balls. Of course, the main pole plate is preferably processed into a transversely and longitudinally distributed ball groove structure.

[0052] Specifically, Figure 4 As shown, when the diameter of the metal ball 1 is less than 1 mm, in order to ensure the metal strength itself, the through hole may not be processed, and the surface of the solid metal ball may be knurled to increase the surface roughness, which can further promote the flow of the electrolyte and the formation of turbulence, thereby improving the precipitation ability of the product gas;

[0053] When the diameter is greater than 1 mm, one or more through holes 11 can be opened on the metal ball 1, and any through hole 11 passes through the center of the metal ball 1. Specifically, it can be one through hole, or a cross hole, or, on the premise that the mechanical strength of the metal ball is sufficient, three through holes can be processed to enhance mass transfer. Here, through the design of the through holes, the electrolyte not only passes through the surface of the metal ball, but also passes through the inside of the metal ball, which greatly promotes the flow of the electrolyte and the formation of turbulence, and improves the precipitation ability of the product gas.

[0054] On the other hand, the present invention also provides a method for preparing a ball-type main plate structure for producing hydrogen by electrolysis of water. The method for preparing the ball-type main plate structure for producing hydrogen by electrolysis of water comprises the following steps:

[0055] S1. Initial forming of metal balls

[0056] Stainless steel or nickel alloy is selected as the material for making the metal ball 1, which is sent to a high-speed forging machine to be cut into small pieces, and then pressed into a spherical shape in a forging die and then roughly ground by a ball mill;

[0057] Specifically, when stainless steel is used, the metal strength of the metal ball can be increased by quenching after rough grinding;

[0058] Or when selecting nickel alloy materials, such as Raney nickel material processing, taking the commonly used W-type Raney nickel as an example, a 1:1 nickel-aluminum alloy is generally used. After the metal ball is obtained by cold heading, it does not need to be quenched and finely ground. In order to ensure the overall structure and mechanical strength of the Raney nickel metal ball in the subsequent use process, it is not necessary to process the through hole. After the subsequent assembly into the electrolytic cell, a high concentration of alkali solution (30wt.% NaOH or KOH) is used to treat and remove the aluminum in the alloy, and finally a nickel skeleton-type metal ball is obtained, which has a three-dimensional interconnected porous structure, which can greatly enhance the effect of the metal ball catalytically decomposing water, and the electrolyte can flow through the porous structure, thereby improving the precipitation ability of the product gas;

[0059] S2. Electroplating of metal balls

[0060] A metal mesh is placed at the bottom of the electroplating tank, and the processed metal ball 1 is evenly spread on the metal mesh after pretreatment, and then the metal electrolyte to be plated is injected, and finally the metal mesh is connected to the negative electrode of the power supply for electroplating, wherein the uniformity and thickness of the coating are controlled by the applied current and the electroplating time;

[0061] The pretreatment includes soaking the metal ball 1 in anhydrous ethanol and an acetic acid solution for 15 minutes each, and quickly removing grease, metal residues and oxide film on the surface of the metal ball 1 by stirring or ultrasonic vibration, and finally drying the metal ball 1;

[0062] The metal plating electrolyte is prepared by mixing ammonium chloride and nickel chloride hexahydrate, and the electroplating deposition current is set to -0.25Acm -2 The deposition time is 15 minutes. After the deposition is completed, take it out, rinse it with ultrapure water and dry it;

[0063] S3. Processing of main pole plate

[0064] According to the diameter and number of the metal balls 1, the ball grooves 21 are processed on the double-side surfaces of the main pole plate 2 in a longitudinal or transverse manner. After the ball grooves 21 are processed, the main pole plate 2 is subjected to nickel electroplating.

[0065] When only the ball groove 21 is processed longitudinally, an annular groove communicating with the flow hole 31 on the bipolar frame 3 is processed on the outer periphery of the main pole plate 2, and the annular groove is communicated with each longitudinal outer side ball groove 21;

[0066] S4. Processing of bipolar frame

[0067] Two exhaust ports 32 and two liquid inlets 33 are respectively processed at the top and bottom of the bipolar frame 3, and a flow hole 31 with an inner diameter larger than the diameter of the metal ball 1 is processed at the top and / or bottom of the bipolar frame 3, and a plurality of metal balls 1 can be discharged or poured in through the flow hole 31; during the operation of the electrolyzer, the electrolyte is introduced through the liquid inlet 33, and the hydrogen and oxygen generated after the electrolysis of water are discharged from the two exhaust ports 32 respectively;

[0068] S5. Assembly of ball-type main plate structure

[0069] The bipolar frame 3 and the main pole plate 2 are welded together. When assembling the metal balls 1, the main pole plate is kept horizontal, and the metal balls 1 are evenly spread into the ball groove 21 on one side. Check whether the plug 4 at the flow hole 31 meets the sealing requirements, and ensure that there is no blockage and accumulation of metal balls 1 near the flow hole 31, and the metal balls 1 can flow out of the flow hole 31 smoothly;

[0070] Then the electrode mesh 5 is tightly fitted with the metal ball 1, and then the diaphragm 6 is assembled to the outside of the electrode mesh 5 and sealed with the bipolar frame 3 through the sealing gasket 7, and then the above operation is repeated to spread the metal ball 1 to the ball groove 21 on the other side. After completing the assembly of the electrode mesh 5 and the diaphragm 6, the assembled ball-type main plate structure is used for electrolysis of water to produce hydrogen, and multiple stages are connected in series according to the actual electrolysis of water to produce hydrogen.

[0071] Specifically, the processing or non-processing of the through hole 11 is selected according to the diameter of the metal ball 1: when the through hole is not processed, the surface of the solid metal ball 1 is knurled to increase the surface roughness; when one or more through holes 11 are processed, any through hole 11 passes through the center of the ball to promote the flow of electrolyte and form turbulence.

[0072] Specifically, the processing method of the flow hole 31 is adjusted according to the thickness of the bipolar frame 3: when the thickness of the bipolar frame 3 is greater than twice the diameter of the metal ball 1, the flow hole 31 is bored at the center of the top and / or bottom of the bipolar frame, the depth of the flow hole 31 extends to contact the outermost metal ball 1 on the main pole plate 2, and the metal ball 1 can be smoothly discharged from the flow hole 31, the flow hole 31 is a stepped hole structure, and an internal thread is processed in the stepped hole, and a plug 4 is processed with the large hole diameter size of the stepped hole, and the flow hole is sealed by the plug 4;

[0073] When the thickness of the bipolar frame 3 is between one and two times the diameter of the metal ball 1, a groove-shaped flow hole 31 with a size larger than the diameter of the metal ball 1 is processed on the inner surface of the top and / or bottom of the bipolar frame 3, and the metal ball 1 can be smoothly discharged from the groove-shaped flow hole 31. At the same time, a plug 4 with the same size and structure as the groove-shaped flow hole 31 is processed, combined with a gasket, and placed in the groove-shaped flow hole 31, and fastened with bolts on both sides of the bipolar frame 3 to achieve a sealing effect. The flow hole 31 in this embodiment has a stepped hole structure, such as Figure 1 shown.

[0074] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A ball-type main plate structure for producing hydrogen by electrolysis of water, characterized in that: It comprises a metal ball (1) with a surface subjected to electroplating treatment, a main pole plate (2) with a plurality of ball grooves (21) on both sides, and a bipolar frame (3) with a flow hole (31) on the top and / or bottom. The main pole plate (2) and the bipolar frame (3) are both annular, the main pole plate (2) is placed in the bipolar frame (3) and the two are coaxially arranged, a plurality of metal balls (1) are provided and are respectively laid in the ball grooves (21) in a flowable manner, the metal balls (1) can be discharged or poured in through the flow holes (31), a plug (4) for sealing is provided in the flow holes (31), and two exhaust ports (32) and two liquid inlets (33) are respectively provided at the top and bottom of the bipolar frame (3).

2. A ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The shape of the ball groove (21) is square or semicircular.

3. A ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The plurality of ball grooves (21) are distributed in both horizontal and vertical directions.

4. A ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 1, characterized in that: A plurality of the ball grooves (21) are distributed longitudinally, and an annular groove communicating with each of the longitudinally outer ball grooves (21) is provided on the outer periphery of the main pole plate (2), and the annular groove is communicated with the flow hole (31).

5. The ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The metal ball (1) is of a solid structure, and its surface is knurled.

6. A ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The metal ball (1) is provided with one or more through holes (11), and any one of the through holes (11) passes through the center of the metal ball (1).

7. A method for preparing a ball-type main electrode plate structure for producing hydrogen by electrolysis of water, comprising preparing a ball-type main electrode plate structure for producing hydrogen by electrolysis of water as claimed in any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: S1. Initial forming of metal balls Stainless steel or nickel alloy is selected as the material for making the metal ball (1), which is sent to a high-speed forging machine to be cut into small pieces, then pressed into a spherical shape in a forging die and then roughly ground in a ball mill; S2. Electroplating of metal balls A metal mesh is placed at the bottom of the electroplating tank, the processed metal balls (1) are evenly spread on the metal mesh after pretreatment, and then the metal electrolyte to be plated is injected, and finally the metal mesh is connected to the negative electrode of the power supply for electroplating, wherein the uniformity and thickness of the coating are controlled by the applied current and the electroplating time; S3. Processing of main pole plate According to the diameter and number of the metal balls (1), ball grooves (21) are processed on the double-side surfaces of the main pole plate (2) in a longitudinal or transverse manner, and after the ball grooves (21) are processed, the main pole plate (2) is subjected to a nickel electroplating treatment; When only the ball groove (21) is processed longitudinally, an annular groove communicating with the flow hole (31) on the bipolar frame (3) is processed on the outer periphery of the main pole plate (2), and the annular groove is communicated with each longitudinal outer side ball groove (21); S4. Processing of bipolar frame Two exhaust ports (32) and two liquid inlets (33) are respectively processed at the top and bottom of the bipolar frame (3), and a flow hole (31) having an inner diameter greater than the diameter of the metal ball (1) is processed at the top and / or bottom of the bipolar frame (3), so that a plurality of metal balls (1) can be discharged or injected through the flow hole (31); S5. Assembly of ball-type main plate structure The bipolar frame (3) and the main pole plate (2) are welded together, and when assembling the metal balls (1), the main pole plate is controlled to remain horizontal, and the metal balls (1) are evenly spread in the ball groove (21) on one side, and the plug (4) at the flow hole (31) is checked to see whether it meets the sealing requirements, and it is ensured that there is no blockage and accumulation of the metal balls (1) near the flow hole (31), and the metal balls (1) can flow out of the flow hole (31) smoothly; Then, the electrode mesh (5) and the metal balls (1) are tightly fitted, and then the diaphragm (6) is assembled to the outer side of the electrode mesh (5) and sealed with the bipolar frame (3) through the sealing gasket (7), and then the above operation is repeated to spread the metal balls (1) to the ball grooves (21) on the other side. After the assembly of the electrode mesh (5) and the diaphragm (6) is completed, the assembled ball-type main plate structure is used for electrolysis of water to produce hydrogen, and multiple stages are connected in series according to the actual electrolysis of water to produce hydrogen.

8. The method for preparing a ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 7, characterized in that: In S1, the through hole (11) is processed or not processed according to the diameter of the metal ball (1): When no through hole is processed, the surface of the solid metal ball (1) is knurled to increase the surface roughness; when one or more through holes (11) are processed, any through hole (11) passes through the center of the ball to promote the flow of electrolyte and the formation of turbulence.

9. The method for preparing a ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 7, characterized in that: The pretreatment in S2 comprises soaking the metal ball (1) in anhydrous ethanol and an acetic acid solution for 15 minutes each, with the aid of stirring or ultrasonic vibration to remove grease, metal residue and oxide film on the surface of the metal ball (1), and finally drying the metal ball (1); The metal plating electrolyte was prepared by mixing ammonium chloride and nickel chloride hexahydrate, and the deposition current was set to -0.25A cm -2 The deposition time is 15 minutes. After deposition, take it out, rinse it with ultrapure water and dry it.

10. The method for preparing a ball-type main plate structure for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The processing method of the flow hole (31) in S4 is adjusted according to the thickness of the bipolar frame (3): When the thickness of the bipolar frame (3) is greater than twice the diameter of the metal ball (1), a flow hole (31) is bored at the center of the top and / or bottom of the bipolar frame, the depth of the flow hole (31) extends to a point where it can contact the outermost metal ball (1) on the main pole plate (2), and the metal ball (1) can be smoothly discharged from the flow hole (31), the flow hole (31) is a stepped hole structure, an internal thread is machined in the stepped hole, and a plug (4) is machined with the large hole diameter size of the stepped hole, and the plug (4) is used to seal the flow hole; When the thickness of the bipolar frame (3) is between one and two times the diameter of the metal ball (1), a groove-shaped flow hole (31) having a size larger than the diameter of the metal ball (1) is processed on the inner surface of the top and / or bottom of the bipolar frame (3), and the metal ball (1) can be smoothly discharged from the groove-shaped flow hole (31). At the same time, a plug (4) having a size and a structure identical to that of the groove-shaped flow hole (31) is processed, combined with a gasket, and placed in the groove-shaped flow hole (31), and is fastened by bolts on both sides of the bipolar frame (3) to achieve a sealing effect.

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