CN114525532B

CN114525532B - Water electrolysis bath and electrolytic hydrogen production system

Info

Publication number: CN114525532B
Application number: CN202210195563.5A
Authority: CN
Inventors: 杨勇智
Original assignee: Jiangsu Xingran Technology Co ltd
Current assignee: Jiangsu Xingran Technology Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2024-03-29
Anticipated expiration: 2042-03-01
Also published as: CN114525532A

Abstract

The application provides a water electrolytic tank and an electrolytic hydrogen production system, which relate to the technical field of hydrogen energy, and comprise a membrane electrode, an anode flow field structure, a cathode flow field structure and a voltage detection circuit; the anode flow field structure comprises an anode conductive plate; the cathode flow field structure includes a cathode conductive plate; the anode conducting plate and the cathode conducting plate are respectively arranged at two sides of the membrane electrode and are connected with the membrane electrode; and two ends of the voltage detection circuit are respectively connected with the anode conductive plate and the cathode conductive plate. The application provides a water electrolysis cell and electrolysis hydrogen production system can effectively monitor the running state of water electrolysis cell in real time, and the hydrogen production remote control can be realized to the electrolysis hydrogen production system that this application provided.

Description

Water electrolysis bath and electrolytic hydrogen production system

Technical Field

The application relates to the technical field of hydrogen energy, in particular to a water electrolysis tank and an electrolysis hydrogen production system.

Background

Hydrogen energy is a secondary energy source, and water is used for producing hydrogen in the electrolytic tank, namely, the hydrogen production is carried out by introducing direct current into the electrolytic tank filled with water, and water molecules are subjected to electrochemical reaction on electrodes to be decomposed into hydrogen and oxygen.

The use of the water in the electrolytic tank to prepare hydrogen can effectively reduce the use of mineral energy and environmental pollution, and the existing water electrolytic tank hydrogen preparing equipment is usually characterized in that the electrolytic tank is assembled in a box body, a water source is externally connected, and water is introduced into the electrolytic tank to react to prepare hydrogen and oxygen. Thus, hydrogen production efficiency is directly determined by the water electrolyzer operating conditions. And because each component structure in the water electrolysis cell is sealed by two end plates, workers are difficult to know in time when the damage occurs in the water electrolysis cell, and the maintenance of the water electrolysis cell and the effective operation of the water electrolysis hydrogen production process are not facilitated.

Disclosure of Invention

An object of the present application is to provide a water electrolyzer, which can effectively monitor the running state of the water electrolyzer in real time.

Another object is also to provide an electrolytic hydrogen production system.

In a first aspect, the present application provides a water electrolyser comprising a membrane electrode, an anode flow field structure and a cathode flow field structure, and a voltage detection circuit;

the anode flow field structure comprises an anode conductive plate;

the cathode flow field structure includes a cathode conductive plate;

the anode conducting plate and the cathode conducting plate are respectively arranged at two sides of the membrane electrode and are connected with the membrane electrode; and two ends of the voltage detection circuit are respectively connected with the anode conductive plate and the cathode conductive plate.

Further, in some embodiments of the present application, the voltage detection circuit includes a voltage detector.

In a second aspect, the present application also provides an electrolytic hydrogen production system comprising:

at least one water electrolysis cell provided in the first aspect;

the control system stores voltage data of the operation of each water electrolysis cell; the control system acquires the voltage information detected by each voltage detection circuit and controls the circuit on-off of each water electrolysis cell according to the mapping relation between the voltage information and the voltage data.

Further, in some embodiments of the present application, controlling the circuit on-off of the water electrolysis tank according to the mapping relationship between the voltage information and the voltage data includes:

when the voltage information falls into the range of the voltage data, the circuit of the water electrolysis cell is kept to be communicated;

when the voltage information falls out of the range of the voltage data, keeping the circuit of the water electrolysis tank open;

the voltage data is the voltage range of the water electrolysis tank when the water electrolysis tank is operated normally for electrolyzing water.

Further, in some embodiments of the present application, the electrolytic hydrogen production system further comprises:

The water purifier is externally connected with a water source; the water purifier is communicated with the water electrolytic tank;

a water purifying tank for storing water treated by the water purifier; one end of the water purifying tank is communicated with the water purifier, and the other end of the water purifying tank is communicated with the water purifier; the water purifying tank is internally provided with a water quality monitoring unit for monitoring water quality in real time; the water quality monitoring unit is electrically connected with the control system.

Further, in some embodiments of the present application, the water quality monitoring unit is a water quality resistivity meter;

the control system stores water electrolysis data of the water electrolysis cell; and the control system acquires water resistance information of the water quality resistivity tester and controls the water path on-off of the water purifier according to the mapping relation between the water resistance data and the water resistance information.

Further, in some embodiments of the present application, the water tank is provided with a water filling port, a water draining oxygen outlet and a hydrogen outlet;

the water injection port is connected with the water purification tank through a first water injection pipeline; the hydrogen outlet is connected with a hydrogen outlet pipeline; the water purifier is connected with the water purifying tank through a second water injection pipeline;

Flow monitoring units for monitoring flow are arranged on the water discharge oxygen outlet pipe, the first water injection pipeline, the second water injection pipeline and the hydrogen outlet pipeline; the flow monitoring unit is electrically connected with the control system.

Further, in some embodiments of the present application, a water vapor separator is disposed on the hydrogen outlet pipe; the exhaust port of the water-gas separator is connected with a hydrogen discharge pipeline; a water outlet of the water-gas separator is connected with a circulating pipeline; the circulating pipeline is connected with the water purifier;

and the hydrogen discharge pipeline and the circulating pipeline are respectively provided with a flow monitoring unit electrically connected with the control system.

Further, in some embodiments of the present application, the control system includes a current adjustment unit;

and the control system controls the current of the water electrolyzer according to the mapping relation between the current data of the water electrolyzer and the flow of the hydrogen in the hydrogen discharge pipeline.

Further, in some embodiments of the present application, the control system further comprises an operating platform, the operating platform comprising a display; the display is used for displaying the running state of the water electrolysis bath. Further, in some embodiments of the present application, the circuits of a plurality of the water electrolysis cells are sequentially connected in series;

The waterways of the plurality of water electrolytic tanks are mutually connected in parallel.

The utility model provides a water electrolyzer, connect a voltage detection circuit on positive pole current-conducting plate and negative pole current-conducting plate for the circuit voltage of real-time supervision water electrolyzer, the running state of water electrolyzer can be known whether normal according to the voltage value that voltage detection circuit detected in real time. If the membrane electrode is damaged, the anode conductive plate and the cathode conductive plate are damaged and other components in the water electrolysis tank are damaged, the voltage information obtained by the voltage detection circuit can be obtained, so that the real-time monitoring on whether the components in the water electrolysis tank normally run or not can be realized through the voltage detection circuit.

The application also provides an electrolytic hydrogen production system, which adopts a voltage detection circuit and a control system to monitor the running state of a water electrolysis tank in the electrolytic hydrogen production system in real time, so that the intelligent controllability of the electrolytic hydrogen production system is realized, and the hydrogen production safety and the operation safety are improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an electrolytic hydrogen production system provided herein;

FIG. 2 is a schematic diagram of the connection structure of a water electrolyzer, a water purifier, a clean water tank, a water pump and a water-gas separator in the electrolytic hydrogen production system provided by the application;

FIG. 3 is a schematic view of the structure of a water electrolyzer in the electrolytic hydrogen production system provided by the present application;

FIG. 4 is a schematic view of the structure of a first B gasket of a water electrolyzer in an electrolytic hydrogen production system provided herein;

FIG. 5 is a schematic diagram of the water pump and water purifier in the electrolytic hydrogen production system provided by the present application;

FIG. 6 is a schematic view of the structure of an electric cabinet in the electrolytic hydrogen production system provided by the present application;

FIG. 7 is a flow chart of an electrolytic hydrogen production system provided herein;

FIG. 8 is a schematic diagram of an electrolytic hydrogen production system provided herein.

In the figure: 1-water pump, 2-water purifier, 3-water purifying tank, 4-water electrolytic tank, 5-water vapor separator, 6-water discharge oxygen outlet pipe, 610-second main pipe, 620-second branch pipe, 7-hydrogen outlet pipe, 710-third main pipe, 720-third branch pipe, 8-first water injection pipe, 9-electric cabinet, 91-box, 92-control unit, 93-electric control switch, 94-signal receiver, 10-second water injection pipe, 110-first main pipe, 120-first branch pipe, 11-hydrogen discharge pipe, 12-oxygen outlet pipe, 15-shell, 16-supporting leg, 17-exhaust hole, 18-display screen, 20-flow monitoring unit, 100-controller, 200-water quality monitoring unit, 300-voltage detection circuit, 400-current adjustment unit, 500-power module, 600-operation platform, 101-membrane electrode, 21-anode pad, 211-foam titanium plate, 212-mesh, 22-cathode pad, 31-anode pad, 311-first ring member, 312-first chamber, 313-first A pad, 314-first B pad, 3141-deflector hole, 3142-runner, 315-first C pad, 32-cathode pad, 321-second A pad, 322-second B pad, 323-second C pad, 41-anode conductive plate, 42-cathode conductive plate, 51-anode insulating plate, 52-cathode insulating plate, 61-anode end plate, 611-water inlet hole, 612-a water-out oxygen outlet, 62-a cathode end plate; 80-electromagnetic valve.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be understood that the terms "thickness," "upper," "lower," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

In a first aspect, referring to fig. 1, the present application provides a water electrolysis cell 4 comprising a membrane electrode 101, an anode flow field structure and a cathode flow field structure and a voltage detection circuit 300;

the anode flow field structure includes an anode conductive plate 41;

the cathode flow field structure includes a cathode conductive plate 42;

the anode conductive plate 41 and the cathode conductive plate 42 are respectively arranged at two sides of the membrane electrode 101 and are connected with the membrane electrode 101; both ends of the voltage detection circuit 300 are respectively connected to the anode conductive plate 41 and the cathode conductive plate 42.

It should be noted that, referring to fig. 3, the anode flow field structure further includes an anode end plate 61, an anode insulating plate 51, an anode gasket 31, and an anode backing plate 21; the anode insulating plate 51 is located between the anode end plate 61 and the anode conductive plate 41, and is used for separating the anode end plate 61 from the anode conductive plate 41 to realize insulation of the anode end plate 61; the anode backing 21 is located between the anode conductive plate 41 and the anode of the membrane electrode 101 as an anode flow field; the anode gasket 31 is located between the anode conductive plate 41 and the anode of the membrane electrode 101 and surrounds the periphery of the anode gasket 31, so as to realize the sealing connection between the anode conductive plate 41 and the membrane electrode 101. The cathode flow field structure further includes a cathode end plate 62, a cathode insulator plate 52, a cathode gasket 32, and a cathode shim plate 22; the cathode insulating plate 52 is located between the cathode end plate 62 and the cathode conductive plate 42, and is used for separating the cathode end plate 62 from the cathode conductive plate 42 to realize insulation of the cathode end plate 62; the cathode backing plate 22 is positioned between the cathode conductive plate 42 and the cathode of the membrane electrode 101 as a cathode flow field; the cathode gasket 32 is located between the cathode conductive plate 42 and the cathode of the membrane electrode 101 and surrounds the cathode gasket 32, so as to realize the sealing connection between the cathode conductive plate 42 and the membrane electrode 101.

When the assembly of the water electrolysis cell 4 is completed, the anode end plate 61, the anode insulating plate 51, the anode conductive plate 41, the anode gasket 31, the anode backing plate 21, the membrane electrode 101, the cathode backing plate 22, the cathode gasket 32, the cathode conductive plate 42, the cathode insulating plate 52 and the cathode end plate 62 are sequentially stacked; the anode conductive plate 41 and the cathode conductive plate 42 are used for external power supply.

Since electrons flow from the anode conductive plate 41 to the cathode conductive plate 42 in the water electrolysis cell 4; therefore, when any one of the components of the anode conductive plate 41, the anode gasket 31, the membrane electrode 101, the cathode gasket 32 or the cathode conductive plate 42 is damaged, the voltage on the water electrolysis tank 4 is obviously fluctuated; in addition, when the anode insulating plate 51 or the cathode insulating plate 52 is damaged, the flow of electrons in the water electrolyzer 4 is changed, so that the voltages at the two ends of the anode conductive plate 41 and the cathode conductive plate 42 on the water electrolyzer 4 are changed, and therefore, the voltage detection circuit 300 is connected to the anode conductive plate 41 and the cathode conductive plate 42, and can reflect the running state of each component sealed between the anode end plate 61 and the cathode end plate 62 in the water electrolyzer 4, so that the real-time monitoring of the running state of the water electrolyzer 4 is realized.

In some embodiments, the voltage detection circuit 300 includes a voltage detector. The voltage detector can be any voltage testing instrument which is available in the market and can be used for detecting the circuit voltage and has proper measuring range and measuring precision, such as a voltmeter and a universal meter.

In the application, the positive and negative ends of the voltage detector can be directly connected with the anode conductive plate 41 and the cathode conductive plate 42, and the voltage detector is simple in structure and low in cost. In some embodiments, a circuit protection element, such as a diode, may also be provided in the voltage detection circuit 300; so as to realize the protection of the voltage detector and improve the safety of the circuit.

In some embodiments, the anode backing 21 and the cathode backing 22 are in intimate contact with the membrane electrode 101 at a pressure of 5t to 10 t; the anode gasket 31 is closely connected with the membrane electrode 101 under the pressure of 5-10 t; the cathode gasket 32 is closely connected with the membrane electrode 101 under the pressure of 5-10 t;

the materials of the anode gasket 31 and the cathode gasket 32 include polytetrafluoroethylene.

The membrane electrode 101 includes an anode, a proton exchange membrane, and a cathode sequentially disposed; the anode and the cathode are respectively positioned at two sides of the proton exchange membrane; the anode backing 21 is limited in the space enclosed by the anode conductive plate 41, the anode gasket 31 and the anode to form a water sump; cathode backing plate 22 is defined within the space enclosed by cathode conductive plate 42, cathode spacer 32, and the cathode, forming a gas pocket. The anode backing 21 serves as a water channel 3142, and introduces the injected water into the anode surface of the membrane electrode 101, so that the injected water is subjected to electrochemical reaction in the current and the anode catalyst to generate oxygen; the hydrogen ions are subjected to electrochemical reaction at the cathode of the membrane electrode 101 through the proton exchange membrane under the catalysis of the catalyst of the cathode, so as to generate hydrogen.

In some embodiments, the anode backing 21 and cathode backing 22 each comprise a titanium foam plate 211; the foam titanium plate 211 is provided with a plurality of micropores with the pore diameter of 5-300 mu m;

The membrane electrode 101 surface is partially embedded in the microwells under the pressure.

The foam titanium plate 211 is a microporous filter plate formed by high-temperature and high-vacuum sintering of pure titanium or titanium alloy powder serving as a raw material after screening, cooling and isostatic pressing, and has the advantages of high porosity, narrow pore size distribution, good chemical stability, acid and alkali corrosion resistance, oxidation resistance, no particle shedding, good mechanical property and the like. In the present application, due to the characteristics of high porosity and uniform pore diameter of the titanium foam plate 211, the water to be electrolyzed injected into the water electrolysis tank 4 can uniformly reach the surface of the membrane electrode 101 through the micropores on the titanium foam plate 211 to perform electrochemical reaction. Meanwhile, the stability, oxidation resistance, corrosion resistance and other characteristics of the foam titanium plate 211 can also prolong the service life of the backing plate, thereby further prolonging the service life of the water electrolysis tank 4; and meanwhile, the channel of water reaching the surface of the membrane electrode 101 is prevented from being blocked by the corroded falling object, so that the membrane electrode 101 is prevented from being polluted.

When the anode backing plate 21 and the cathode backing plate 22 are pressed to the surface of the membrane electrode 101 under pressure, micro deformation can be generated on the surface of the membrane electrode 101 due to the pressure effect and micro holes on the foam titanium plate 211, and the micro holes are partially embedded into the micro holes to be in contact with the side surfaces of the micro holes, so that the contact area between the membrane electrode 101 and the anode backing plate 21 and the cathode backing plate 22 is increased, the resistance is reduced, and the effect of saving electricity consumption is further achieved.

The pressure applied to the anode backing plate 21 and the cathode backing plate 22 is not too large or too small, the membrane electrode 101 is easily deformed seriously due to the too large pressure, the electrochemical reaction on the membrane electrode 101 is affected, the service life of the membrane electrode 101 is prolonged, the pressure born by each layer in the water electrolyzer 4 is also increased due to the too large pressure, the compression resistance requirement of each layer is improved, and the service life of the water electrolyzer 4 is shortened or the cost is greatly increased; when the pressure is too small, micro deformation of the surface of the membrane electrode 101 is difficult to occur, and although the gap between the anode backing plate 21 and the cathode backing plate 22 and the membrane electrode 101 can be reduced to improve the sealing property between the anode backing plate 21 and the cathode backing plate 22 and the membrane electrode 101, the contact area between the anode backing plate 21 and the cathode backing plate 22 and the membrane electrode 101 is not increased significantly, the resistance drop is not obvious, and the effects of reducing the voltage and saving the electricity are difficult to be achieved.

In some embodiments, the anode backing 21 and cathode backing 22 each include mesh 212; the mesh 212 is uniformly distributed on one side of the titanium foam plate 211 far away from the membrane electrode 101;

the mesh 212 is provided with a plurality of small holes with the pore diameter larger than that of the micropores, so that gradient water passing of water to be electrolyzed is realized, the water passing rate of the first gasket and the second gasket is faster, and the water to be electrolyzed can reach the surface of the membrane electrode 101 rapidly.

In some embodiments, the material of mesh 212 is stainless steel. Because the cost of the titanium foam plate 211 is higher, the mesh 212 prepared from stainless steel with lower cost is used for replacing a part of the titanium foam plate 211, so that the cost can be reduced, the thicknesses of the anode backing plate 21 and the cathode backing plate 22 can be increased, and water to be electrolyzed can be well received.

In some embodiments, the mesh 212 has a thickness not less than the thickness of the titanium foam plate 211 to better receive water to be electrolyzed.

In some embodiments, the thickness of the titanium foam plate 211 is 0.3-2.2 mm; and/or

Mesh 212 has a thickness of 0.5 to 3.1mm.

In some embodiments, the apertures provided in mesh 212 have a pore size of 0.8 to 4.5mm.

The pore size of the small pores on the mesh sheet 212 should not be too large or too small. Too large or too small pore diameters have difficulty in achieving the gradient water passing effect, and the water passing rate of the anode backing plate 21 and the cathode backing plate 22 is not obviously improved.

In some embodiments, the anode gasket 31 and the cathode gasket 32 each include an annular member and a chamber defined by the annular member;

an upper water guide part and a lower water guide part are arranged on each annular piece;

The upper water guide part and the lower water guide part comprise a flow guide hole 3141 and a plurality of flow channels 3142; one end of the flow channel 3142 is communicated with the flow guide hole 3141, and the other end of the flow channel is communicated with the cavity; the flow channel 3142 is arranged in a fan shape from the flow guiding hole 3141 to the chamber;

the upper water guide part is positioned at the upper part of the anode gasket 31 or the cathode gasket 32; the lower water guide is positioned below the anode gasket 31 or the cathode gasket 32.

In some embodiments, referring to fig. 4, the anode gasket 31 is disposed on one side of the anode; the anode gasket 31 includes a first annular member 311 and a first chamber 312 surrounded by the first annular member 311;

the first annular member 311 is provided with a first water guiding part and a second water guiding part;

the first water guiding part and the second water guiding part comprise a flow guiding hole 3141 and a plurality of flow channels 3142; one end of the flow channel 3142 is communicated with the flow guiding hole 3141, and the other end is communicated with the first chamber 312; the flow channel 3142 is fanned from the flow guiding hole 3141 to the first chamber 312;

the first water guide part is positioned at the upper part of the anode gasket 31; the second water guide is located below the anode gasket 31.

The cathode gasket 32 is disposed on the cathode side; the cathode gasket 32 includes a second annular member and a second chamber defined by the second annular member;

The second annular piece is provided with a third water guide part and a fourth water guide part;

the third water guide part and the fourth water guide part comprise water guide holes and a plurality of flow channels 3142; one end of the flow channel 3142 is communicated with the water guide hole, and the other end of the flow channel 3142 is communicated with the second chamber; the flow channel 3142 is arranged in a fan shape from the water guide hole to the second chamber;

the third water guide part is positioned at the upper part of the cathode gasket 32; the fourth water guide is located below the cathode spacer 32.

When the water electrolysis tank 4 electrolyzes water, the water to be electrolyzed is injected from the water guide holes of the first water guide part, is split through the flow channels 3142 distributed in a fan shape, is uniformly injected into the first chamber 312 at one side of the anode, then reaches the anode through the anode backing plate 21, and performs electrochemical reaction; the water which is not electrolyzed is collected from the flow channel 3142 of the second water guiding part and then discharged through the water guiding hole of the second water guiding part.

In this application, first water guide portion and second water guide portion all set up on first gasket, need process the current conducting plate when having avoided water guide portion to set up on the current conducting plate, simplified the seting up process of first water guide portion and second water guide portion, improve the seting up efficiency and the seting up cost of first water guide portion and second water guide portion, and then improve the production efficiency of water power plant 4. Meanwhile, in the application, as the first gasket adopts polytetrafluoroethylene, deformation of the first gasket under larger pressure is small, the possibility is provided for the first water guide part and the second water guide part to be arranged on the gasket, and the influence on water inflow and water drainage caused by extrusion of the runner 3142 of the first water guide part and the second water guide part due to large deformation of the traditional silica gel under larger pressure is avoided.

The cathode gasket 32 includes a second annular member and a second chamber surrounded by the second annular member. To receive the water to be electrolyzed, the thickness of the anode spacer 31 is equal or nearly equal to the thickness of the anode backing 21; the thickness of the cathode gasket 32 is equal or nearly equal to the thickness of the cathode backing plate 22, so that the anode backing plate 21 completely fills the first chamber 312 and the cathode backing plate 22 completely fills the second chamber, and better receives water to be electrolyzed.

Thus, in some embodiments, the anode gasket 31 and the cathode gasket 32 are each 2-3 mm thick. Preferably, the thickness of anode gasket 31 and cathode gasket 32 are slightly less than the thickness of anode backing plate 21 and cathode backing plate 22, respectively, so that they are an interference fit.

In some embodiments, the anode gasket 31 includes a first a gasket 313, a first B gasket 314, and a first C gasket 315, which are disposed in order; the first a-pad 313 is connected to the membrane electrode 101; the first water guide part and the second water guide part are disposed on the first B gasket 314;

the cathode gasket 32 includes a second a gasket 321, a second B gasket 322, and a second C gasket 323 sequentially arranged; the second a-pad 321 is connected to the membrane electrode 101.

In some embodiments, the water electrolysis cell 4 further comprises a first conductive plate and a second conductive plate respectively located at two sides of the membrane electrode 101; the first conductive plate is connected with one side of the anode gasket 31 away from the membrane electrode 101; the second conductive plate is connected with one side of the cathode gasket 32 away from the membrane electrode 101;

a first water guide hole communicated with the water guide part on the anode gasket 31 is arranged on the first conductive plate;

a second water guide hole communicated with the water guide part on the cathode gasket 32 is arranged on the second conductive plate;

and conductive lugs for externally connecting a power supply are arranged on the first conductive plate and the second conductive plate.

Note that, the first C pad 315 and the second C pad 323 are located between the first B pad 314 and the first conductive plate, and between the second B pad 322 and the second conductive plate, respectively; the water electrolysis tank 4 is tightly pressed between the first conductive plate and the first B gasket 314, between the second conductive plate and the second B gasket 322 in the pressing process, so that the sealing connection between the first conductive plate and the first B gasket 314, between the second conductive plate and the second B gasket 322 is realized. The first a gasket 313 and the second a gasket 321 are connected with both sides of the membrane electrode 101 in advance to fix the membrane electrode 101, and then the first B gasket 314 is connected with the membrane electrode 101 and the second B gasket 322 is connected with the membrane electrode 101 in a sealing way by being pressed. The first gasket and the second gasket are formed by combining three gaskets, so that the gasket is more compact after being pressed compared with a single gasket, the water leakage condition can be better reduced, and the runner 3142 is conveniently formed on the first B gasket 314.

In some embodiments, the first C shim 315 and the second C shim 323 each have a thickness of 0.1-0.2 mm; and/or

The thickness of the first B gasket 314 and the second D gasket 322 is 2 mm-4 mm respectively; and/or

The thickness of the first and second a-shims 313 and 321 is 0.1mm to 0.2mm, respectively.

In some embodiments, the water electrolysis cell 4 further comprises a first end plate and a second end plate located on both sides of the membrane electrode 101, respectively;

the first end plate is positioned on one side of the first conductive plate away from the membrane electrode 101; a first insulating plate is arranged between the first end plate and the first conductive plate;

the second end plate is positioned at one side of the second conductive plate away from the membrane electrode 101; a second insulating plate is arranged between the second end plate and the second conductive plate;

the first end plate is provided with a water inlet hole 611, and the water inlet hole 611 is communicated with the first water guide hole.

In this application, the first end plate is located on the anode side of the membrane electrode 101 and the second end plate is located on the cathode side of the membrane electrode 101. The first end plate is also provided with a water and oxygen discharging hole, and oxygen generated after water electrolysis and water which is not electrolyzed are discharged out of the electrolytic tank through the water and oxygen discharging hole; the second end plate is provided with a hydrogen outlet hole, and hydrogen generated after water electrolysis is discharged out of the electrolytic tank from the hydrogen outlet hole, so that the hydrogen can be conveniently collected.

The first insulating gasket and the second insulating gasket are insulating plates which are made of insulating materials and can have insulating effect, and are respectively positioned between the first end plate and the first conducting plate as well as between the second end plate and the second conducting plate, so that the first end plate and the first conducting plate as well as the second end plate and the second conducting plate are separated, electrification of the first end plate and the second end plate is avoided, and hydrogen production safety is improved; at the same time, the electron flow direction in the first conductive plate and the second conductive plate is single, and the stable and continuous current of the water electrolysis tank 4 can be kept.

In some embodiments, the first insulating plate and the second insulating plate are made of the same material as the first gasket and the second gasket, and are prepared using polytetrafluoroethylene as a main raw material.

In some embodiments, the first end plate, first insulating plate, first conductive plate, anode backing 21, cathode backing 22, second conductive plate, second insulating plate, and second end plate are connected by a plurality of fasteners;

spring gaskets are arranged between the fastening pieces and the first end plate and the second end plate; the spring washer remains compressed when the fastener is attached to the first and second end plates.

In some embodiments the fastener is a bolt and a nut threadedly coupled to the bolt.

In some embodiments, at least 4 threaded holes are correspondingly formed on the first end plate and the second end plate respectively, and the first end plate and the second end plate and each component between the first end plate and the second end plate are fixed through bolts in threaded connection with the threaded holes and nuts in threaded connection with the bolts.

In some embodiments, a metal gasket is padded between the head of the bolt and the first/second end plates; a metal gasket is arranged between the nut and the second end plate/the first end plate in a cushioning manner, the spring gasket is positioned between the heads of the metal gasket and the bolts and the metal gasket and the nut, so that all components are fixed together through the bolts penetrating through the first end plate, the first insulating plate, the first conducting plate, the anode backing plate 21, the cathode backing plate 22, the second conducting plate, the second insulating plate and the second end plate, and the first insulating plate, the first conducting plate, the anode backing plate 21, the cathode backing plate 22, the second conducting plate, the second insulating plate and the second end plate are tightly attached after high pressure. Meanwhile, the spring washer which is kept in a compressed state can also keep the first insulating plate, the first conductive plate, the anode backing plate 21, the cathode backing plate 22, the second conductive plate, the second insulating plate and the second end plate in a compressed state all the time, so that the compression stability of the water electrolysis tank 4 is kept.

In a second aspect, the present application also provides an electrolytic hydrogen production system, referring to fig. 7, comprising:

at least one water electrolysis cell 4 provided in the first aspect;

a control system which stores voltage data for the operation of each of the water electrolysis cells 4; the control system obtains the voltage information detected by each voltage detection circuit 300, and controls the circuit on-off of each water electrolysis cell 4 according to the mapping relation between the voltage information and the voltage data.

It should be noted that the control system includes a controller 100, a power module 500, a communication module, an operation platform 600, a data processing module, and a storage module. The power module 500 is electrically connected with the controller 100, the communication module, the operation platform 600, the data processing module, the storage module and the water electrolysis tank 4, and is used for controlling the power supply of the controller 100, the communication module, the operation platform 600, the data processing module, the storage module and the water electrolysis tank 4. The communication module is electrically connected with the controller 100, the storage module and the data processing module, and is used for receiving or transmitting signals. The communication module is preferably a wireless communication module, so as to realize remote wireless control of the controller 100 on each module. The operation platform 600 is electrically connected to the controller 100, and a display and various operation buttons are provided on the operation platform 600 for viewing and performing various control operations through the operation platform 600. The data processing module is electrically connected with each detecting element in the water electrolysis tank 4 and is used for collecting and processing information collected in each detecting element and receiving and processing each information sent by the controller 100. The storage module is electrically connected with the controller 100, the communication module and the data processing module, and is used for storing various information acquired by the control system. In the present application, the detection element is a detection device for collecting information of the water electrolysis tank 4, such as a voltage detector, a water quality resistivity meter, and a flow rate monitoring unit 20, in the water electrolysis tank 4.

When the electrolytic hydrogen production system is in operation, the anode conductive plate 41 and the cathode conductive plate 42 of the water electrolysis tank 4 are connected with direct current; when the water electrolysis cell 4 operates normally, the voltage displayed by the voltage detector in the voltage detection circuit 300 is stable; when a certain part in the water electrolyzer 4 is damaged or fails, the voltage displayed by the voltage detector is obviously fluctuated, so that the control system can judge whether the water electrolyzer 4 is in normal operation or not according to the voltage signal obtained by the voltage detector side, and the on-off of a circuit of the water electrolyzer 4 is controlled by the control system, so that workers can find out and process in time, the hydrogen production safety is improved, and the loss is reduced. Meanwhile, the control system can also be used for closing the power supply of each module in the electrolytic hydrogen production system in time when the water electrolysis tank 4 does not operate, so that the power waste or the occurrence of safety accidents is reduced.

In some embodiments, referring to fig. 6, the control system further comprises an electric cabinet 9, the electric cabinet 9 comprising a cabinet 91 and a control unit 92, an electric control switch 93 and a signal transceiver 94 mounted in the cabinet 91; the control unit 92, the electric control switch 93 and the signal transceiver 94 are electrically connected with the control system. The control unit 92 is electrically connected with the electric control switch 93 and the signal receiver 94; the electric control switch 93 is used for controlling the circuit on-off of the water electrolysis bath 4; the signal transceiver 94 is configured to receive information sent by the operation platform 600 or send information to the operation platform 600, and the signal transceiver 94 may also receive signals from and send signals to components in the electrolytic hydrogen production system. The electric cabinet 9 is arranged in an area close to the water electrolyzer 4, and workers can conduct electric control operation in real time in the field, so that equipment overhaul and maintenance are facilitated.

In some embodiments, the box 91 of the electric cabinet 9 is further provided with a display screen 18 and an operation button electrically connected with the electric control switch 93, and the display screen 18 is used for displaying the working state of the water electrolysis tank 4; the operation button is used for performing an electric control switch 93 operation.

In some embodiments, controlling the circuit on-off of the water electrolysis tank 4 according to the mapping relation between the voltage information and the voltage data includes:

when the voltage information falls within the range of the voltage data, the circuit of the water electrolysis tank 4 is kept to be communicated;

when the voltage information falls out of the range of the voltage data, keeping the circuit of the water electrolysis tank 4 open;

the voltage data is the voltage range of the water electrolysis tank 4 when the water electrolysis tank is operated normally.

It should be noted that the voltage data may be preset in the control system before the water electrolysis cell 4 is operated and stored in a memory module of the control system.

In some embodiments, referring to fig. 2 and 5, the electrolytic hydrogen production system further includes:

the water purifier 2 is externally connected with a water source; the water purifier 2 is communicated with a water discharge oxygen outlet 612 of the water electrolysis tank 4;

a clean water tank 3 for storing the water treated by the water purifier 2; one end of the water purifying tank 3 is communicated with the water purifier 2, and the other end is communicated with a water filling port of the water purifier 4; a water quality monitoring unit for monitoring water quality in real time is arranged in the water purifying tank 3; the water quality monitoring unit 200 is electrically connected with the control system.

In some embodiments, the water purifier 2 is provided with a first water inlet, a second water inlet and a water outlet; the first water inlet is communicated with a water pump 1 which pumps the water pump 1 into the water purifier 2 and is used for externally connecting a water source; the second water inlet is communicated with a water discharge oxygen outlet 612 of the water electrolyzer 4 and is used for recovering the water which is not electrolyzed by the water electrolyzer 4, so that the water can be recycled; the water outlet is communicated with the clean water tank 3 and is used for injecting water to be electrolyzed into the clean water tank 3.

In some embodiments, the outlet end of the fresh water tank 3 is provided with an adjustable first flow valve for regulating the flow of water injected into the water electrolysis tank 4. The first flow valve is a solenoid valve electrically connected to the controller 100 so as to realize remote control of the first flow valve.

The water quality monitoring unit for monitoring the water quality in real time is arranged in the water purifying tank 3, and can be used for monitoring the water quality in the water purifying tank 3 in real time, so that the water quality change in the water purifying tank 3 is avoided, and the operation of the water electrolysis tank 4 is prevented from being influenced. In addition, the water purifier 2 is used for purifying water injected into the water purifying tank 3, so that the water quality of the water injected into the water electrolysis tank 4 is stable, and the influence of water quality change on the efficiency and service life of the water electrolysis tank 4 is avoided. In addition, the water quality monitoring unit can also be used as monitoring equipment of the water purifier 2, when the water treatment capacity of the water purifier 2 is reduced or damage occurs, the water quality of the water entering the water purifying tank 3 can be changed, so that the water quality change of the water in the water purifying tank 3 can be monitored through the water quality monitoring unit arranged in the water purifying tank 3, the running states of the water purifier 2 and the water purifying tank 3 can be monitored, and reminding is provided for maintenance and overhaul of the water purifier 2 and the water purifying tank 3.

In some embodiments, the water quality monitoring unit 200 is a water quality resistivity meter;

the control system stores water electrolysis data of the operation of the water electrolysis bath 4; the control system acquires water resistance information of the water quality resistivity tester, and controls water path on-off of the water purifier 2 according to the mapping relation between the water resistance data and the water resistance information.

In the electrolytic hydrogen production process, in order to avoid damage to the membrane electrode 101 by suspended particles and mineral ions in the water, the water used in the electrolytic hydrogen production is usually pure water. Therefore, by measuring the resistivity of the water, it can be determined whether the quality of the water for electrolytic hydrogen production meets the requirements of electrolytic hydrogen production.

Because the water purifier 2 is externally connected with a water source through the water pump 1, when the water quality monitoring unit monitors the water quality change, the water channel in the whole electrolytic hydrogen production system can be cut off by cutting off the water flow in the pipeline connected with the water pump 1 by the water purifier 2, so that the maintenance of workers is facilitated. In some embodiments, the water tank 4 is provided with a water filling port, a water draining oxygen outlet 612 and a hydrogen outlet;

a water and oxygen draining pipe 6 is connected to the water and oxygen draining outlet 612, and the water filling port is connected with the water purifying tank 3 through a first water filling pipeline 8; the hydrogen outlet is connected with a hydrogen outlet pipeline 7; the water purifier 2 and the water purifying tank 3 are connected through a second water injection pipeline 10;

Flow monitoring units 20 for monitoring flow are arranged on the water discharge oxygen outlet pipe 6, the first water injection pipeline 8, the second water injection pipeline 10 and the hydrogen outlet pipeline 7; the flow monitoring unit 20 is electrically connected to the control system.

In this application, the flow monitoring unit 20 may be a commercially available gas flow meter or liquid flow meter for monitoring the flow rate of fluid in a pipeline.

In some embodiments, a water-gas separator 5 is arranged on a hydrogen outlet pipeline 7 of the water-gas separator 5 of the water-discharge oxygen-discharging pipe 6; an oxygen outlet pipeline 12 of the water-gas separator 5 is connected with a hydrogen discharge pipeline 11 on an exhaust port of the water-gas separator 5; a water outlet of the water-gas separator 5 is connected with a circulating pipeline; the circulating pipeline is connected with the water purifier 2;

the hydrogen discharge pipeline 11 and the circulating pipeline are respectively provided with a flow monitoring unit 20 electrically connected with the control system.

The water-gas separator 5 is used for separating water vapor from hydrogen to improve the purity of the hydrogen; the water discharge oxygen pipe 6 is connected with the water purifier 2. It should be noted that, the oxygen outlet pipe 12 and the hydrogen outlet may be connected to a gas storage device, so as to store oxygen and hydrogen respectively, so as to facilitate the subsequent use of the hydrogen and the oxygen.

In some embodiments, the oxygen outlet pipe 12, the circulation pipe, the first water injection pipe 8, the second water injection pipe 10 and the hydrogen discharge pipe 11 are respectively provided with a flow monitoring unit 20 for respectively monitoring the flow and the flow rate of water, the flow and the flow rate of hydrogen, and the flow rate of oxygen, so as to obtain the hydrogen production efficiency of the electrolytic hydrogen production system, and the oxygen outlet pipe 12, the circulation pipe, the first water injection pipe 8, the second water injection pipe 10 and the hydrogen discharge pipe 11/the hydrogen discharge pipe 7 can be respectively provided with control valves for controlling and adjusting the flow thereof, so that the hydrogen production efficiency and the hydrogen production control amount of the electrolytic hydrogen production system can be conveniently adjusted. These control valves may be solenoid valves electrically connected to the controller 100, facilitating remote control and viewing of the control system. After the hydrogen production amount of the water electrolyzer 4 reaches the required yield, the control system can realize the suspension of hydrogen production by cutting off the power supply of the water electrolyzer 4 and each control valve and each flow valve.

In some embodiments, the control system includes a current adjustment unit 400; the control system controls the current of the water electrolyzer 4 according to the mapping relation between the current data of the water electrolyzer 4 and the flow of the hydrogen in the hydrogen outlet pipeline 7, so as to adjust the hydrogen production rate of the water electrolyzer 4.

In this application, the current adjustment unit 400 may adjust the magnitude of the current of the water electrolysis cell 4. The hydrogen production rate of the water electrolysis tank 4 can be adjusted according to the corresponding relation between the current in the water electrolysis tank 4 and the hydrogen production rate.

The correspondence between the current in the water electrolysis tank 4 and the hydrogen production amount is as follows: 1 a=7 ml of hydrogen;

in some embodiments, the current adjustment unit 400 may adjust the current for an adjustable resistor connected in series on the circuit of the water electrolyzer 4.

In some embodiments, the electrolytic hydrogen production system further comprises a housing 15; the water tank 4, the water purifier 2, the water purifying tank 3 and the water pump 1 are all arranged in the shell 15;

the bottom surface of the housing 15 is provided with at least three support legs.

The shell 15 protects all components in the shell 15, so that all components are prevented from being bumped by the outside to cause damage, and the support legs 16 separate the shell 15 and the components from the ground to avoid being affected with damp.

It should be noted that, the housing 15 is provided with an exhaust hole, and the exhaust hole is used for connecting the oxygen outlet pipe 12 and the hydrogen exhaust pipe 11 extending out of the housing 15 to the gas storage device.

In some embodiments, the housing 15 is further provided with an exhaust vent 17.

In some embodiments, the operation platform 600 is additionally provided, so that a worker can remotely observe real-time monitoring data of each component in real time, and the worker can perform real-time operation on the operation platform 600 to control and adjust the running state of each component.

In some embodiments, referring to fig. 8, the electrolytic hydrogen production system includes a plurality of water electrolysis cells 4; the circuits of the plurality of water electrolysis baths 4 are sequentially connected in series; the waterways of the plurality of the water tanks 4 are connected in parallel.

Note that, in this application: "the circuit of the water electrolysis tank 4" means a circuit to which the anode conductive plate 41 and the cathode conductive plate 42 of the water electrolysis tank 4 are connected. Thus, the sequential series connection of the circuits of the plurality of water electrolysis cells 4 is understood as: the plurality of water baths 4 are connected in series as elements in one circuit by wires through the anode conductive plate 41 and the cathode conductive plate 42 therein, respectively.

Each water electrolysis cell 4 is connected in parallel with a voltage detection circuit, and the voltage detection circuit is used for independently detecting the voltage information of each water electrolysis cell 4.

In the present application, the term "water channel of the water electrolyzer 4" means a channel for water injection and discharge and gas discharge in the water electrolyzer 4. Thus, the parallel connection of the waterways of the plurality of water baths 4 to each other should be understood as: the water injection ends of the plurality of water electrolytic cells 4 are connected to each other, the water discharge ends of the plurality of water electrolytic cells 4 are connected to each other, and the gas discharge ends of the plurality of water electrolytic cells 4 are connected to each other.

A water filling port and a water draining and oxygen discharging port 612 are arranged on one side of the anode of each water electrolysis tank 4; a hydrogen outlet is arranged on one side of the cathode of each water electrolysis tank 4; a solenoid valve 80 electrically connected with the control system is arranged on the second water injection pipeline 10 connected with each water injection port; a solenoid valve 80 electrically connected with the control system is also arranged on the water and oxygen discharge pipeline 6 connected with each water and oxygen discharge port 612; a solenoid valve 80 electrically connected with the control system is also arranged on the hydrogen outlet pipeline 7 connected with each hydrogen outlet; the control system respectively and independently controls the on-off of each electromagnetic valve 80, and further controls the operation of each water electrolysis tank 4; when a certain water electrolyzer 4 is overhauled and replaced, the operation of other water electrolyzers 4 is not influenced, each water electrolyzer 4 is modularized, and the modularized management of the electrolytic hydrogen production system is realized.

In some embodiments, a plurality of water electrolysis cells 4 are arranged in an array; the second water injection pipe 10 comprises a first main pipe 110 and a plurality of first branch pipes 120; one end of the first main pipe 110 is communicated with the fresh water tank 3, and the other end is respectively communicated with each water injection port through a plurality of first branch pipes 120. The water discharge oxygen piping 6 includes a second main pipe 610 and a second branch pipe 620; one end of the second main pipe 610 communicates with the water purifier 2, and the other end communicates with each of the water discharge oxygen outlet 612 through the second branch pipe 620. The hydrogen outlet pipe 7 includes a third main pipe 710 and a third branch pipe 720, one end of the third main pipe 710 communicates with a container for storing hydrogen gas, and the other end communicates with each hydrogen outlet through the third branch pipe 720.

In some embodiments, a water-gas separator is connected to the third main pipe for separating hydrogen and water.

In some embodiments, a flow monitoring unit is provided on each of the first, second and third branch conduits for monitoring the hydrogen production rate of each of the water electrolysis cells 4.

In some embodiments, the flow monitoring units are disposed on the first main pipe, the second main pipe, and the third main pipe, reducing the number of flow monitoring units, and reducing costs.

When the electrolytic hydrogen production system operates, each voltage detector, the water quality monitoring unit 200 and the flow monitoring unit 20 monitor the operation condition of the water electrolyzer 4 in real time, the detected voltage information, water quality information and flow information are transmitted to the controller, and whether the operation of the water electrolyzer 4 is normal or not is judged through judgment logic prestored in the controller; when the maintenance or the operation is needed to be stopped, the controller sends an on-off signal to a switch on a circuit and/or an electromagnetic valve on a waterway of the corresponding water electrolyzer, and the switch on the circuit and/or the electromagnetic valve on the waterway of the water electrolyzer 4 is switched according to the received signal; remote control of the switch on the circuit of the water electrolyzer 4 and/or the solenoid valve on the waterway is achieved.

In some embodiments, the electrolytic hydrogen production system further comprises a voltage stabilizer in communication with the power module 500 for stabilizing the voltage in the electrolytic hydrogen production system.

In some embodiments, the electrolytic hydrogen production system may also adjust the number of water baths 4 that are operated by their voltage fluctuations. Namely: when the voltage in the electrolytic hydrogen production system is lower than the voltage range required in normal operation thereof, the electric circuit and the waterway of at least one water electrolysis tank 4 are closed by the controller. It should be noted that, according to the magnitude of the difference between the real-time voltage at the input end and the output end of the power module 500 of the electrolytic hydrogen production system and the minimum voltage required when the electrolytic hydrogen production system is operating normally, the number of closed water electrolytic cells 4 is adjusted, and when the difference is larger, the number of closed water electrolytic cells 4 is larger, and when the difference is smaller, the number of closed water electrolytic cells 4 is smaller.

In some embodiments, each water electrolyzer 4 is pre-numbered and its number is stored in the control system so that the control system can select the water electrolyzer 4 to be shut down according to its number sequence.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The water electrolysis cell is characterized by comprising a membrane electrode, an anode flow field structure, a cathode flow field structure and a voltage detection circuit;

the anode flow field structure comprises an anode conductive plate;

the cathode flow field structure includes a cathode conductive plate;

the anode conducting plate and the cathode conducting plate are respectively arranged at two sides of the membrane electrode and are connected with the membrane electrode; two ends of the voltage detection circuit are respectively connected with the anode conductive plate and the cathode conductive plate;

The anode flow field structure comprises an anode end plate, an anode insulating plate, an anode gasket and an anode backing plate; the anode insulating plate is positioned between the anode end plate and the anode conducting plate, the anode backing plate is positioned between the anode conducting plate and the anode of the membrane electrode, and the anode gasket is positioned between the anode conducting plate and the anode of the membrane electrode and surrounds the periphery of the anode gasket; the cathode flow field structure comprises a cathode end plate, a cathode insulating plate, a cathode gasket and a cathode backing plate; the cathode insulating plate is positioned between the cathode end plate and the cathode conducting plate, the cathode backing plate is positioned between the cathode conducting plate and the cathode of the membrane electrode, and the cathode gasket is positioned between the cathode conducting plate and the cathode of the membrane electrode and surrounds the periphery of the cathode gasket; the anode backing plate and the cathode backing plate are closely connected with the membrane electrode under the pressure of 5-10 t; the anode gasket is closely connected with the membrane electrode under the pressure of 5-10 t; the cathode gasket is closely connected with the membrane electrode under the pressure of 5-10 t;

the anode backing plate and the cathode backing plate comprise foam titanium plates; the foam titanium plate is provided with a plurality of micropores with the pore diameter of 5-300 mu m; the membrane electrode surface is partially embedded in the microwells under the pressure.

2. The water cell of claim 1, wherein the voltage detection circuit comprises a voltage detector.

3. An electrolytic hydrogen production system, comprising:

at least one water electrolysis cell according to claim 1 or 2;

4. An electrolytic hydrogen production system according to claim 3, wherein controlling the circuit on-off of the water electrolysis cell according to the mapping relation between the voltage information and the voltage data comprises:

5. The electrolytic hydrogen production system according to claim 3, further comprising:

6. The electrolytic hydrogen production system according to claim 5, wherein the water quality monitoring unit is a water quality resistivity meter;

7. The electrolytic hydrogen production system according to claim 5, wherein the water electrolysis tank is provided with a water filling port, a water discharge oxygen outlet and a hydrogen outlet;

the water injection port is connected with the water purification tank through a first water injection pipeline; the hydrogen outlet is connected with a hydrogen outlet pipeline; the water purifier is connected with a water pump; the water pump is connected with the water purifier through a second water injection pipeline;

8. The electrolytic hydrogen production system according to claim 7, wherein a water-gas separator is provided on the hydrogen outlet pipe; a hydrogen discharge pipeline is connected to an exhaust port of the water-gas separator; a water outlet of the water-gas separator is connected with a circulating pipeline; the circulating pipeline is connected with the water purifier;

9. The electrolytic hydrogen production system according to claim 8, wherein the control system includes a current adjustment unit;

10. An electrolytic hydrogen production system according to claim 3, wherein the circuits of the plurality of water electrolysis cells are connected in series in sequence;