Multi-channel bipolar electrolytic bath and water electrolysis experimental device

Abstract

The utility model relates to a multi-channel bipolar electrolytic bath and a water electrolysis experiment device. The multi-channel bipolar electrolytic bath comprises polar plates, end plates, diaphragms and an electrolytic bath frame, the polar plates comprise a cathode polar plate and an anode polar plate; the end plates are located on the two sides of the multi-channel bipolar electrolytic cell. The end plates on the two sides are connected through fasteners. The polar plates, the end plates and the diaphragms are arranged between the end plates on the two sides; an anode net and a cathode net are arranged on two sides of the diaphragm; the cathode plate clings to the anode net; the cathode plate clings to the cathode net; and the diaphragm and the polar plate are pressed against the electrolytic cell frame. The water electrolysis experiment device comprises a multi-channel bipolar electrolytic bath. Compared with the prior art, the multi-channel bipolar electrolytic bath disclosed by the utility model is reasonable in structure, facilitates changing accessories such as electrodes and diaphragms, can test the performance of different types of accessories, can increase and decrease the number of bipolar plates to increase the test flux, can simultaneously carry out two or more experiments in one set of device, and can simultaneously monitor, regulate and control multiple groups of parameters; the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a multi-channel bipolar electrolyzer and a water electrolysis experimental device. Background Art

[0002] As global climate change intensifies, the use of hydrogen energy can significantly reduce carbon emissions. Hydrogen energy has a wide range of applications and can be used in transportation, power generation, industrial manufacturing and other fields. With the development of technology and the reduction of costs, the commercial application of hydrogen energy has gradually become possible.

[0003] As one of the most important methods for producing hydrogen, water electrolysis uses water as raw material and electricity as energy. It can effectively utilize renewable energy such as wind energy and light energy, and has a high energy conversion rate. It is an ideal source of green hydrogen. According to the type of electrolyte, water electrolysis technology in commercial or research and development stages is roughly divided into alkaline water electrolysis (ALK), proton exchange membrane water electrolysis (PEM), anion exchange membrane water electrolysis (AEM) and solid oxide water electrolysis (SOEC). Among them, the alkaline water electrolysis (ALK) technology route is the most mature, but limited by the performance of electrodes and diaphragms, the existing alkaline water electrolysis devices have low operating density and high power consumption, resulting in high equipment investment and operating costs, making it difficult to promote large-scale commercial use. At present, the test of electrodes is mainly carried out in a three-electrode system. The test conditions are quite different from the actual conditions, and it is difficult to reflect the performance of electrodes and diaphragms under real conditions, which seriously restricts the research and development of advanced electrodes and diaphragms.

[0004] Therefore, there is an urgent need for an experimental device that can simulate actual working conditions to the greatest extent, has strong scalability, is easy to assemble and disassemble, and can operate with high electrical density. Utility Model Content

[0005] The purpose of the utility model is to provide a multi-channel bipolar electrolyzer and a water electrolysis experimental device for electrode and diaphragm screening in order to solve the above problems. The multi-channel bipolar electrolyzer of the utility model has a reasonable structure, is convenient for changing electrodes, diaphragms and other accessories, and can realize the test of the performance of different types of accessories. In the utility model, increasing or decreasing the number of bipolar plates can increase the test flux, and two or more experiments can be carried out simultaneously in a set of equipment, and multiple groups of parameters can be monitored and regulated at the same time to improve the test efficiency. Compared with the laboratory three-electrode test device, the utility model is closer to industrial production conditions, and can be a method for long-term testing of electrode, diaphragm and plate material selection at low cost and high efficiency, which helps the development and testing of key components of electrolysis equipment.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] The first object of the utility model is to provide a multi-channel bipolar electrolytic cell, comprising: a pole plate, an end plate, a diaphragm and an electrolytic cell frame; the pole plate comprises a cathode pole plate and an anode pole plate; the end plate is located at both sides of the multi-channel bipolar electrolytic cell; the end plates on both sides are connected by fasteners; the pole plate, the end plate and the diaphragm are all arranged between the end plates on both sides; an anode pole net and a cathode pole net are placed on both sides of the diaphragm; the anode pole plate is tightly attached to the anode pole net; the cathode pole plate is tightly attached to the cathode pole net; the diaphragm and the pole plate are both pressed against the electrolytic cell frame.

[0008] Furthermore, the electrolytic cell frame is pressed together with the diaphragm and the electrode plate to form a closed space, providing a flow channel for the flow of alkali solution and gas.

[0009] Furthermore, a copper sheet is provided between the end plate and the electrode plate, and the copper sheet plays a conductive role.

[0010] Furthermore, the electrode plates include an anode monopolar plate, a cathode monopolar plate and a bipolar plate; the bipolar plate is arranged between the anode monopolar plate and the cathode monopolar plate; the front and back sides of the bipolar plate are the anode side and the cathode side respectively; the anode side of the anode monopolar plate and the bipolar plate is the anode electrode plate; the cathode side of the cathode monopolar plate and the bipolar plate is the cathode electrode plate.

[0011] Furthermore, the single electrolysis unit experimental device consists of a cathode monopolar plate (or cathode surface) and an anode monopolar plate (or anode surface).

[0012] Furthermore, multiple experimental units can be connected in series through bipolar plates to increase the test throughput. The two sides of the electrolysis experimental device tank are anode and cathode monopolar plates, and adding different numbers of bipolar plates to it can form different numbers of electrolysis units.

[0013] Furthermore, the fastener is a stud; an insulating washer is provided at the end of the stud.

[0014] Furthermore, a feed inlet is provided at the bottom of the side of the electrolytic cell frame for the inlet of alkali solution, and multiple discharge ports are provided on the top and both sides of the upper part for the discharge of gas phase and liquid phase; detection element interfaces are respectively arranged at the upper part, side and lower part of the electrolytic cell frame.

[0015] Furthermore, by inserting thermometers, pressure gauges and other detection elements into the detection element interface of the electrolytic cell frame, the temperature and pressure fluctuations of the cathode and anode chambers (a cavity formed between two plates, including the electrode to be tested and the diaphragm, forming a chamber) can be measured respectively.

[0016] Furthermore, by changing the cathode material, anode material and diaphragm material, the different performances in the alkaline water electrolysis process can be explored, and the optimal anode and cathode and diaphragm materials can be screened out.

[0017] Furthermore, the elastic end structure can be changed according to test requirements.

[0018] Furthermore, the electrode plate is provided with a terminal for measuring voltage.

[0019] The assembly method of the multi-channel bipolar electrolyzer comprises the following steps:

[0020] Step 1: Select a stud of appropriate length as required, insert it into the end plate, screw a nut on one side to fix the end plate and place it facing upwards;

[0021] Step 2: Place a copper sheet (for conductivity) and a cathode monopolar plate on the end plate in sequence, and then place a sealing gasket on the cathode monopolar plate;

[0022] Step 3: Take two electrolytic cell frames, and form a pair of screw holes on the upper side, ensuring that there are three holes on one side of the front and one hole on the other side, and two holes on the upper and lower sides; ensure that there is a feed port interface at the bottom of one side of the front, and there is only one discharge port interface on the upper side of the other side, and the other side is the opposite; leave a gas reflux interface on the upper side along the diagonal, and reserve a thermometer hole near the cathode plate, and block all other holes with plugs and raw tape;

[0023] Step 4: Place gaskets on both sides of each electrode plate (i.e., there are two sealing gaskets between the two electrolytic cell frames), and place the cathode electrode to be tested on one side of the cathode monopolar plate and the cell frame.

[0024] Step 5: Place the diaphragm to be tested in the middle of the sealing gasket as required;

[0025] Step 6: The other side of the diaphragm to be tested is the anode side of the next bipolar plate and the slot frame, and the required anode electrode to be tested is placed;

[0026] Step 7: Put the sealing gasket on, put the bipolar plate in, and put the anode into the slot frame facing the gasket;

[0027] Step 8: Repeat the above steps until several plates and slot frames are put in;

[0028] Step 9: Assemble the anode single-stage plate and the copper sheet, fix them with screws, place the plate under the end plate, and pass through the eight studs;

[0029] Step 10: Tighten all nuts diagonally with a wrench.

[0030] Furthermore, after step 10, perform the following steps: connect the liquid inlet, gas and liquid reflux pipes to the alkali solution tank (this alkali solution tank belongs to the alkali solution reflux tank, which is used for alkali solution circulation in the device and is divided into an anode liquid circulation tank and a cathode liquid circulation tank), insert four thermometers into the holes reserved for the cathode gas reflux above, and connect them to the positive and negative ends of the power cord according to the anode and cathode plates.

[0031] The second object of the utility model is to provide a water electrolysis experimental device including the above-mentioned multi-channel bipolar electrolytic cell, which is used for electrode and diaphragm screening. The water electrolysis experimental device also includes an anolyte circulation pump group, a cathode liquid circulation pump group, an anolyte circulation tank, and a cathode liquid circulation tank; the multi-channel bipolar electrolytic cell is respectively connected to the anolyte circulation pump group, the cathode liquid circulation pump group, the anolyte circulation tank, and the cathode liquid circulation tank.

[0032] Furthermore, the anolyte circulation pump group is connected to the multi-channel bipolar electrolyzer through the anolyte inlet hose; the cathode liquid circulation pump group is connected to the multi-channel bipolar electrolyzer through the cathode liquid inlet hose; the anolyte circulation tank is connected to the multi-channel bipolar electrolyzer through the anolyte discharge pipe; the cathode liquid circulation tank is connected to the multi-channel bipolar electrolyzer through the cathode liquid discharge pipe; the anolyte circulation pump group is connected to the anolyte circulation tank through the anolyte inlet pump hose; the cathode liquid circulation pump group is connected to the cathode liquid circulation tank through the cathode liquid inlet pump hose; the anolyte circulation tank is connected with an oxygen vent pipe; the cathode liquid circulation tank is connected with a hydrogen vent pipe.

[0033] Furthermore, the anolyte circulation pump group and the cathode liquid circulation pump group are preferably peristaltic pumps, and less preferably plunger pumps.

[0034] Furthermore, the anolyte circulation tank and the cathode liquid circulation tank are preferably made of pure nickel, and less preferably of polymer plastic material. The lower parts of the anolyte circulation tank and the cathode liquid circulation tank can be connected according to measurement needs to balance the liquid level.

[0035] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0036] 1) Most of the existing devices for screening electrodes are laboratory three-electrode structures and do not have the function of simultaneously screening membranes and electrodes. The experimental device based on the utility model can detect important parameters such as electrolysis voltage and chamber temperature during water electrolysis. By changing components such as electrodes and diaphragms, different types of combinations and combined performances are tested to screen out the optimal combination.

[0037] 2) By increasing the number of bipolar plates, the test throughput can be increased, two or more experiments can be carried out simultaneously in one device, and multiple sets of parameters can be monitored and controlled at the same time to improve test efficiency.

[0038] 3) The size of the test electrode and diaphragm is adapted to the size of the frame, which is closer to industrial production conditions than laboratory-level test equipment.

[0039] 4) The device of this utility model can simulate the actual working conditions to the greatest extent, has strong scalability, is easy to disassemble and assemble, and has high operating density. Compared with the laboratory three-electrode test device, it is closer to industrial production conditions and can perform long-term tests on electrodes, diaphragms and plate materials at low cost and high efficiency. It greatly helps the research and development of key components of electrolytic cells such as electrodes and diaphragms. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the water electrolysis experimental device of the utility model.

[0041] Figure 2 The exploded schematic diagram of the multi-channel bipolar electrolyzer of the utility model.

[0042] Figure 3 This is a schematic diagram of the structure of the multi-channel bipolar electrolyzer of the utility model. In the figure: 1-end plate; 2-copper sheet; 3-cathode monopolar plate; 4-electrolyzer frame; 5-electrode to be tested; 6-diaphragm to be tested; 7-bipolar plate; 8-sealing gasket; 9-anode monopolar plate; 10-stud;

[0043] 11-multi-channel bipolar electrolyzer; 12-anolyte circulation pump set; 13-cathode liquid circulation pump set; 14-anolyte circulation tank; 15-cathode liquid circulation tank;

[0044] 01-anolyte inlet pump hose; 02-anolyte inlet electrolyzer hose; 03-anolyte outlet pipe; 04-cathode liquid inlet pump hose; 05-cathode liquid inlet electrolyzer hose; 06-cathode liquid outlet pipe; 07-oxygen vent pipe; 08-hydrogen vent pipe. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with specific embodiments, but this is by no means a limitation of the present invention. Any features such as preparation methods, materials, structures or composition ratios not clearly described in this technical solution are considered to be common technical features disclosed in the prior art.

[0046] In the drawings, components with the same structure are indicated by the same numerical labels, and components with similar structures or functions are indicated by similar numerical labels. The size and thickness of each component shown in the drawings are shown arbitrarily, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer and show the matching relationship between the various components, some parts in the drawings are appropriately scaled, and the distance between the components is increased or decreased.

[0047] In the description of the embodiments of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] Example

[0050] like Figures 2-3 As shown, this embodiment provides a multi-channel bipolar electrolytic cell, including: an end plate 1, a copper sheet 2, a cathode monopolar plate 3, an electrolytic cell frame 4, an electrode to be tested 5, a diaphragm to be tested 6, a bipolar plate 7, a sealing gasket 8, an anode monopolar plate 9, and a stud 10.

[0051] The multi-channel bipolar electrolyzer can be selected in different sizes, and in this embodiment it can be 10*10cm, and the diaphragm and electrodes are also cut according to this size. Compared with the test in the laboratory beaker, this structure is a scaled-down industrial design structure and is more meaningful for test reference.

[0052] The end plates 1 are located on both sides of the multi-channel bipolar electrolyzer, and the end plates 1 on both sides are connected by studs 10; copper sheet 2, cathode monopolar plate 3, electrolyzer frame 4, electrode to be tested 5, diaphragm to be tested 6 ( Figure 2 There are two diaphragms to be tested 6), bipolar plates 7, sealing gaskets 8, and anode monopolar plates 9 are all arranged between the end plates 1 on both sides.

[0053] An anode grid and a cathode grid are placed on both sides of the diaphragm to be tested 6; the cathode monopolar plate 3 is close to the cathode grid; the anode monopolar plate 9 is close to the anode grid; the diaphragm and the plate are both pressed against the electrolytic cell frame 4.

[0054] The electrolytic cell frame 4 is pressed together with the diaphragm and the electrode plate to form a closed space, providing a flow channel for the flow of alkali solution and gas.

[0055] The electrode plates include an anode monopolar plate 9, a cathode monopolar plate 3 and a bipolar plate 7; the bipolar plate 7 is arranged between the anode monopolar plate 9 and the cathode monopolar plate 3; the front and back sides of the bipolar plate 7 are the anode side and the cathode side respectively; the anode side of the anode monopolar plate 9 and the bipolar plate 7 is the anode electrode plate; the cathode side of the cathode monopolar plate 3 and the bipolar plate 7 is the cathode electrode plate.

[0056] An insulating washer is provided at the end of the stud 10 .

[0057] The sealing gasket 8 is arranged between the electrode plate and the electrolytic cell frame 4 .

[0058] The electrolytic cell frame 4 has a feed inlet at the bottom side thereof for feeding alkali solution, and multiple discharge ports are provided on the top and both sides of the upper part for discharging gas and liquid phases; detection element interfaces are respectively arranged on the upper part, side and lower part of the electrolytic cell frame 4.

[0059] Insert thermometers, pressure gauges and other detection elements into the detection element interface of the electrolytic cell frame 4 to measure the temperature and pressure fluctuations of the cathode and anode chambers (the electrolytic cell is divided into multiple chambers by a number of plates, and there is a diaphragm between every two plates. Under the total potential of the anode plate and the cathode plate, the potential is evenly distributed among the middle plates, so that each chamber constitutes an electrolytic cell with an anode plate and a cathode plate, and a cavity is formed between the two plates, including the electrode to be tested 5 and the diaphragm to be tested 6, forming a chamber).

[0060] By changing the cathode material, anode material and separator material, the different performances in the alkaline water electrolysis process can be explored.

[0061] Furthermore, the electrode plate is provided with a terminal for measuring voltage.

[0062] The assembly method of the multi-channel bipolar electrolyzer comprises the following steps:

[0063] Step 1: Select a stud 10 of appropriate length as required, insert it into the end plate 1, screw a nut into one side to fix the end plate and place it upward;

[0064] Step 2: Take a copper sheet and a cathode monopolar plate 3 and place them on the end plate 1 in sequence, and then place a sealing gasket 8 on the cathode monopolar plate 3;

[0065] Step 3: Take two electrolytic cell frames 4, and form a pair of screw holes on the upper side, ensuring that there are three holes on one side of the front and one hole on the other side, and two holes on the upper and lower sides; ensure that there is a feed port interface at the bottom of one side of the front, and there is only one discharge port interface on the upper side of the other side, and the other side is opposite; leave a gas reflux interface on the upper side along the diagonal, reserve a thermometer hole near the cathode plate, and block all other holes with plugs and raw tape;

[0066] Step 4: Gaskets are placed on both sides of each electrode plate (i.e., two sealing gaskets 8 are placed between the two electrolytic cell frames 4), and the cathode electrode to be tested is placed between the cathode monopolar plate and one side of the electrolytic cell frame 4;

[0067] Step 5: Place the diaphragm 6 to be tested in the middle of the sealing gasket 8 as required;

[0068] Step 6: The other side of the diaphragm 6 to be tested is the anode side of the next bipolar plate and the electrolytic cell frame 4, into which the required anode electrode to be tested is placed;

[0069] Step 7: Place the sealing gasket 8, put in the bipolar plate 7, and put the anode into the electrolytic cell frame 4 with the gasket facing the anode;

[0070] Step 8: Repeat the above steps until several plates and the electrolytic cell frame 4 are placed;

[0071] Step 9: Assemble the anode single-stage plate 9 and the copper sheet, fix them with screws, place the plate under the end plate 1, and pass through eight studs 10;

[0072] Step 10: Tighten all nuts diagonally with a wrench.

[0073] After step 10, perform the following step 11: connect the liquid inlet, gas and liquid reflux pipes to the alkali solution tank (this alkali solution tank is an alkali solution reflux tank, which is used for alkali solution circulation in the device and is divided into an anode liquid circulation tank 14 and a cathode liquid circulation tank 15), insert four thermometers into the holes reserved for the cathode gas reflux above, and connect them to the positive and negative ends of the power cord according to the anode and cathode plates.

[0074] like Figure 1 As shown, this embodiment further provides a water electrolysis experimental device of the above-mentioned multi-channel bipolar electrolyzer, which is used for electrode and diaphragm screening, and the water electrolysis experimental device also includes an anolyte circulation pump group 12, a cathode liquid circulation pump group 13, an anolyte circulation tank 14, and a cathode liquid circulation tank 15; the multi-channel bipolar electrolyzer 11 is respectively connected to the anolyte circulation pump group 12, the cathode liquid circulation pump group 13, the anolyte circulation tank 14, and the cathode liquid circulation tank 15.

[0075] The anolyte circulation pump group 12 is connected to the multi-channel bipolar electrolyzer 11 through the anolyte inlet hose 02; the cathode liquid circulation pump group 13 is connected to the multi-channel bipolar electrolyzer 11 through the cathode liquid inlet hose 05; the anolyte circulation tank 14 is connected to the multi-channel bipolar electrolyzer 11 through the anolyte discharge pipe 03; the cathode liquid circulation tank 15 is connected to the multi-channel bipolar electrolyzer 11 through the cathode liquid discharge pipe 06; the anolyte circulation pump group 12 is connected to the anolyte circulation tank 14 through the anolyte inlet pump hose 01; the cathode liquid circulation pump group 13 is connected to the cathode liquid circulation tank 15 through the cathode liquid inlet pump hose 04; the anolyte circulation tank 14 is connected to an oxygen vent pipe 07; the cathode liquid circulation tank 15 is connected to a hydrogen vent pipe 08.

[0076] The anode liquid circulation pump group 12 and cathode liquid circulation pump group 13 are preferably peristaltic pumps, and less preferably plunger pumps.

[0077] The anolyte circulation tank 14 and the cathode liquid circulation tank 15 are preferably made of pure nickel, and less preferably of polymer plastic material. The anolyte circulation tank 14 and the cathode liquid circulation tank 15 can be connected at the bottom according to measurement needs to balance the liquid level.

[0078] In this embodiment, the electrode 5 to be tested is selected as the cathode and cathode, and the ion membrane is selected as the cathode and cathode diaphragm 6 to be tested for performance testing. The test device is assembled as shown in the figure. In addition, two bipolar plates 7 can be added to form three electrolysis chambers to form a triple parallel experiment (the multi-channel bipolar electrolyzer is a sandwich structure, and the number of bipolar plates 7 can be adjusted) to ensure data reliability. After the multi-channel bipolar electrolyzer and the water electrolysis experimental device are assembled, a 30% concentration of KOH solution is introduced as the electrolyte, the temperature of the electrolysis chamber is maintained at 80°C, and the current density of the electrolysis is controlled to be 4000A / m2 using a DC power supply. Long-term electrolysis experiments are carried out to test the stability of the electrodes and diaphragms, focusing on monitoring the fluctuation of the electrolysis voltage. During the measurement process, the electrolyte can be sampled and the metal ion concentration can be detected to evaluate the corrosion of the electrode. In addition to the conventional constant load experiment, a fluctuating load can be applied to the experimental device to detect the stability of the material to be tested under a fluctuating load. By changing the composition of the electrolyte, the effects of different impurity ion types and concentrations on the material to be tested can be explored.

[0079] In addition to testing the performance of electrodes and diaphragms, the feasibility of building electrolytic cells with different materials can also be explored by changing the material of the plates. For example, plates made of pure nickel, stainless steel, and carbon steel with nickel plating can be used to build experimental devices, and then the corrosion resistance of the corresponding materials can be tested through the actual electrolysis process.

[0080] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A multi-channel bipolar electrolyzer, characterized in that: include: Electrode plates, end plates (1), diaphragms and electrolytic cell frames (4); The electrode plates include a cathode electrode plate and an anode electrode plate; The end plates (1) are located on both sides of the multi-channel bipolar electrolyzer; The end plates (1) on both sides are connected by fasteners; The electrode plate, the end plate (1), and the diaphragm are all arranged between the end plates (1) on both sides; An anode mesh and a cathode mesh are placed on both sides of the diaphragm; The anode plate is in close contact with the anode grid; The cathode plate is in close contact with the cathode grid; The diaphragm and the electrode plate are both pressed tightly against the electrolytic cell frame (4).

2. A multi-channel bipolar electrolyzer according to claim 1, characterized in that: The polar plates include an anode monopolar plate (9), a cathode monopolar plate (3) and a bipolar plate (7); The bipolar plate (7) is arranged between the anode monopolar plate (9) and the cathode monopolar plate (3); The front and back sides of the bipolar plate (7) are respectively an anode side and a cathode side; The anode surfaces of the anode monopolar plate (9) and the bipolar plate (7) are anode plates; The cathode surfaces of the cathode monopolar plate (3) and the bipolar plate (7) are cathode plates.

3. A multi-channel bipolar electrolyzer according to claim 1, characterized in that: The fastener is a stud (10); An insulating washer is provided at the end of the stud bolt (10).

4. A multi-channel bipolar electrolyzer according to claim 1, characterized in that: The electrolytic cell frame (4) has a feed inlet at the bottom side thereof for feeding alkali solution, and a plurality of discharge outlets are provided at the top and on both sides of the upper portion for discharging gas phase and liquid phase.

5. A multi-channel bipolar electrolyzer according to claim 1, characterized in that: The upper part, the side part and the lower part of the electrolytic cell frame (4) are respectively provided with detection element interfaces.

6. A multi-channel bipolar electrolyzer according to claim 1, characterized in that: The pole plate is provided with a terminal for measuring voltage.

7. A water electrolysis experimental device comprising the multi-channel bipolar electrolyzer according to any one of claims 1 to 6, used for electrode and diaphragm screening, characterized in that: The water electrolysis experimental device also includes an anolyte circulation pump group (12), a cathode liquid circulation pump group (13), an anolyte circulation tank (14), and a cathode liquid circulation tank (15); The multi-channel bipolar electrolytic cell (11) is respectively connected to an anolyte circulation pump group (12), a cathode liquid circulation pump group (13), an anolyte circulation tank (14), and a cathode liquid circulation tank (15).

8. A water electrolysis experimental device according to claim 7, characterized in that: The anolyte circulation pump group (12) is connected to the multi-channel bipolar electrolyzer (11) via an anolyte inlet electrolyzer hose (02); The cathode liquid circulation pump group (13) is connected to the multi-channel bipolar electrolyzer (11) via a cathode liquid inlet electrolyzer hose (05); The anolyte circulation tank (14) is connected to the multi-channel bipolar electrolytic tank (11) via an anolyte discharge pipe (03); The cathode liquid circulation tank (15) is connected to the multi-channel bipolar electrolytic tank (11) via a cathode liquid discharge pipe (06); The anolyte circulation pump group (12) is connected to the anolyte circulation tank (14) via an anolyte pump inlet hose (01); The cathode liquid circulation pump group (13) is connected to the cathode liquid circulation tank (15) via a cathode liquid inlet pump hose (04); The anolyte circulation tank (14) is connected to an oxygen venting pipe (07); The cathode liquid circulation tank (15) is connected to a hydrogen venting pipe (08).

9. A water electrolysis experimental device according to claim 8, characterized in that: The anolyte circulation pump group (12) is selected from a peristaltic pump or a plunger pump; The cathode liquid circulation pump group (13) is selected from a peristaltic pump or a plunger pump.

10. A water electrolysis experimental device according to claim 8, characterized in that: The anolyte circulation tank (14) and the cathode liquid circulation tank (15) are made of pure nickel material or high molecular plastic material.

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