PEM electrolytic bath and hydrogen compressor

Abstract

The utility model relates to the field of electrolytic baths, and discloses a PEM electrolytic bath and a hydrogen compressor, and the PEM electrolytic bath comprises a hydrogen channel which is arranged on the center line of the electrolytic bath and is used for leading out generated hydrogen; the water channel and the oxygen channel are symmetrically arranged on the two sides of the hydrogen channel, the water channel is located above the oxygen channel, the water channel is used for conveying water, and the oxygen channel is used for guiding out generated oxygen; the hydrogen channel, the waterway channel and the oxygen channel are positioned on the same central axis; the hydrogen channel is communicated with one end of the electrolytic cell, and the waterway channel and the oxygen channel are both communicated with the other end of the electrolytic cell. The hydrogen channel is arranged on the center line of the electrolytic cell, so that the wetting degrees of the membrane electrodes around the hydrogen channel are consistent, the problem of wetting difference is avoided, the membrane thickness difference is avoided, and the problems of sealing looseness and air leakage of the electrolytic cell are avoided.

Description

Technical Field

[0001] The utility model relates to the field of electrolyzers, in particular to a PEM electrolyzer and a hydrogen compressor. Background Art

[0002] PEM electrolyzer is used to produce hydrogen by electrolyzing water. Raw water enters the anode chamber of the electrolyzer and undergoes an electrochemical reaction under the action of external current to generate hydrogen and oxygen. Hydrogen is generated in the cathode chamber of the electrolyzer and oxygen is generated in the anode chamber of the electrolyzer. The generated hydrogen and oxygen will eventually be guided through the flow channel to the designated container for storage.

[0003] like Figure 6-7 As shown, the traditional hydrogen channel, water channel and oxygen channel are all arranged around the electrolyzer, and the membrane electrode is divided into an effective reaction area and a frame covering area. Water will flow in the effective reaction area and electrolysis reaction will occur to generate hydrogen and oxygen. The frame covering area will be provided with channels for the flow of hydrogen, oxygen and unreacted water. When the membrane electrode electrolyzes water, its effective reaction area is moistened by water and the humidity will be high. In the frame covering area, the hydrogen flowing in the hydrogen channel will moisten the frame covering area near the hydrogen channel due to the certain amount of water. However, the water content in the hydrogen is less than that in the effective reaction area. Therefore, there is a difference in the wetting degree of the membrane electrode in the effective reaction area and the membrane electrode in the frame covering area, resulting in a difference in the thickness of the membrane electrode, resulting in gas leakage. This phenomenon is more obvious when the hydrogen pressure is high (above 50MP). Summary of the invention

[0004] The utility model aims to solve the above problems and provides a PEM electrolyzer and a hydrogen compressor, which solves the problem that the membrane electrode in the electrolyzer or the hydrogen compressor is prone to membrane thickness difference, resulting in leakage of the electrolyzer or the hydrogen compressor.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A PEM electrolyzer comprising:

[0007] A hydrogen channel is provided on the center line of the electrolyzer, and is used to guide the generated hydrogen;

[0008] A water channel and an oxygen channel are symmetrically arranged on both sides of the hydrogen channel, and the water channel is located above the oxygen channel. The water channel is used to transport water, and the oxygen channel is used to export the generated oxygen.

[0009] The hydrogen channel, the water channel and the oxygen channel are located on the same central axis;

[0010] The hydrogen channel is communicated with one end of the electrolytic cell, and the water channel and the oxygen channel are both communicated with the other end of the electrolytic cell.

[0011] Preferably, the electrolytic cell further comprises:

[0012] Cathode terminal plates and anode terminal plates provided at both ends of the electrolytic cell;

[0013] A bipolar plate, disposed between the cathode end plate and the anode end plate;

[0014] A first electrolysis module and a second electrolysis module having the same structure, wherein the first electrolysis module and the second electrolysis module are respectively sandwiched on both sides of the bipolar plate through a cathode end plate and an anode end plate, and the first electrolysis module and the second electrolysis module are both used for electrolyzing water to produce hydrogen;

[0015] The hydrogen channel passes through the cathode end plate, the first electrolysis module and the bipolar plate from left to right in sequence and extends to the second electrolysis module;

[0016] The water channel passes through the anode end plate, the second electrolysis module and the bipolar plate from right to left in sequence and extends into the first electrolysis module;

[0017] The oxygen channel passes through the anode terminal plate, the second electrolysis module and the bipolar plate in sequence from right to left and extends into the first electrolysis module.

[0018] Preferably, the first electrolysis module comprises:

[0019] cathode plate;

[0020] A first membrane electrode is sandwiched between the cathode plate and the bipolar plate, two first titanium felts are respectively provided on both sides of the first membrane electrode, and the two first titanium felts are respectively accommodated in the cathode plate and the bipolar plate;

[0021] A first titanium mesh is disposed between the first titanium felt contained in the bipolar plate and the bipolar plate.

[0022] Preferably, the first electrolysis module further comprises:

[0023] a first drainage channel, connecting the waterway channel and the first titanium mesh, wherein the first drainage channel is used to guide water into the first titanium mesh;

[0024] The second drainage channel is connected to the oxygen channel and the first titanium mesh, and the second drainage channel is used to guide oxygen into the oxygen channel.

[0025] Preferably, the pore size of the first titanium felt is smaller than the pore size of the first titanium mesh, and the projected areas of the first titanium felt and the first titanium mesh are equal to the area of ​​the effective reaction region of the first membrane electrode.

[0026] Preferably, a hydrogen guide is provided in the middle of the first titanium felt contained in the cathode plate, and the hydrogen guide is used to collect hydrogen produced from the first membrane electrode.

[0027] Preferably, the hydrogen flow guide comprises a cross flow channel, the cross flow channel is communicated with the first titanium felt accommodated in the cathode plate, and the intersection of the cross flow channels is communicated with the hydrogen channel.

[0028] Preferably, the first electrolysis module further comprises a cathode insulating plate, wherein the cathode insulating plate is sandwiched between the cathode end plate and the cathode plate, and the cathode insulating plate is used to prevent leakage of the electrolytic cell.

[0029] Preferably, a plurality of thread grooves are provided on one side of the cathode plate close to the cathode insulating plate, and the plurality of thread grooves play a role of multiple sealing.

[0030] A hydrogen compressor comprises the above-mentioned PEM electrolyzer.

[0031] The contribution of the utility model is:

[0032] 1. By setting the hydrogen channel on the center line of the electrolyzer, the membrane electrode around the hydrogen channel is uniformly wetted, and there will be no wetting difference problem, thus avoiding the difference in membrane thickness and the problem of loose seal and air leakage in the electrolyzer.

[0033] 2. The hydrogen channel, water channel and oxygen channel are located on the same central axis, and the forces are distributed on the same axis, so that the compression force of each component in the electrolyzer is more uniform, which reduces the design difficulty of the sealing structure and reduces the risk of leakage.

[0034] 3. The hydrogen channel, the water channel and the oxygen channel are connected to the two ends of the electrolyzer respectively. Specifically, the hydrogen channel is connected to the cathode end plate of the electrolyzer, and the water channel and the oxygen channel are connected to the anode end plate of the electrolyzer. The hydrogen is treated separately from the oxygen and water, so that the force inside the electrolyzer is more uniform and gas doping is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a cross-sectional schematic diagram of the electrolytic cell of the utility model;

[0036] Figure 2 It is an explosion schematic diagram of the electrolytic cell of the utility model;

[0037] Figure 3 It is a side view of the electrolytic cell of the utility model;

[0038] Figure 4 It is a structural schematic diagram of the cathode plate of the utility model;

[0039] Figure 5 It is a schematic diagram of the structure of the first titanium felt and the hydrogen guide member of the utility model;

[0040] Figure 6It is a schematic diagram of the design method of the hydrogen channel in the prior art;

[0041] Figure 7 It is a schematic diagram of the film thickness difference existing in the prior art; DETAILED DESCRIPTION

[0042] The following embodiments are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0043] In the description of the present invention, it should be understood that the term "and / or" represents three combinations of A or B or A and B.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] like Figure 1 As shown, a PEM electrolyzer comprises:

[0046] A hydrogen channel 10 is provided on the center line of the electrolyzer, and the hydrogen channel 10 is used to guide the generated hydrogen;

[0047] The water channel 20 and the oxygen channel 30 are symmetrically arranged on both sides of the hydrogen channel 10, and the water channel 20 is located above the oxygen channel 30. The water channel 20 is used to transport water, and the oxygen channel 30 is used to export the generated oxygen.

[0048] The hydrogen channel 10, the water channel 20 and the oxygen channel 30 are located on the same central axis;

[0049] The hydrogen channel 10 is communicated with one end of the electrolytic cell, and the water channel 20 and the oxygen channel 30 are both communicated with the other end of the electrolytic cell.

[0050] The PEM electrolyzer is used to produce hydrogen by electrolyzing water. A hydrogen channel 10, a water channel 20 and an oxygen channel 30 are provided in the PEM electrolyzer. The hydrogen channel 10 is used to conduct the hydrogen generated by electrolyzing water out of the electrolyzer, the water channel 20 is used to introduce water into the electrolyzer, and the oxygen channel 30 is used to conduct the oxygen generated by electrolyzing water out of the electrolyzer.

[0051] Specifically, in this embodiment, the hydrogen channel 10 is arranged on the center line of the electrolytic cell. When the hydrogen is discharged from the electrolytic cell, it will not cause the thickness difference of the membrane electrode in the electrolytic cell (including the first membrane electrode 72 in the first electrolytic module 70 and the second membrane electrode in the second electrolytic module 80), thereby ensuring that there will be no leakage during electrolysis in the electrolytic cell.

[0052] In view of the above leakage phenomenon, further explanation is given here, such as Figure 6-7 As shown, the conventional hydrogen channel 10, the water channel 20 and the oxygen channel 30 are all arranged around the electrolyzer. Taking the first membrane electrode 72 as an example, the first membrane electrode 72 is divided into an effective reaction area 1a and a frame covering area 1b. Water will flow through the effective reaction area 1a and an electrolysis reaction will occur to generate hydrogen and oxygen. The frame covering area 1b will be provided with channels for the flow of hydrogen, oxygen and unreacted water. When the first membrane electrode 72 electrolyzes water, its effective reaction area 1a is moistened by water and the humidity will be relatively high. In the frame covering area 1b, the hydrogen flowing in the hydrogen channel 10 will moisten the frame covering area 1b near the hydrogen channel 10 due to the presence of a certain amount of water. However, the water content in the hydrogen is less than that in the effective reaction area 1a. Therefore, there is a difference in the degree of wetting between the membrane electrode at the effective reaction area 1a and the membrane electrode at the frame covering area 1b, resulting in a difference in the thickness of the membrane electrode, which leads to gas leakage. This phenomenon is more obvious when the hydrogen pressure is relatively high (above 50MP).

[0053] In this embodiment, the hydrogen channel 10 is arranged on the center line of the electrolyzer, so that the wetting degree of the membrane electrode around the hydrogen channel 10 is consistent, and the problem of wetting difference will not occur, the membrane thickness difference will be avoided, and the problem of loose seal and air leakage in the electrolyzer will be avoided.

[0054] The hydrogen channel 10, the water channel 20 and the oxygen channel 30 are located on the same central axis, and the forces are distributed on the same axis, so that the compression force of each component in the electrolyzer is more uniform, which reduces the design difficulty of the sealing structure and reduces the risk of leakage.

[0055] The hydrogen channel 10 and the water channel 20 and the oxygen channel 30 are respectively connected to the two ends of the electrolytic cell. Specifically, the hydrogen channel 10 is connected to the cathode end plate 40 of the electrolytic cell, and the water channel 20 and the oxygen channel 30 are connected to the anode end plate 50 of the electrolytic cell. The hydrogen is processed separately from the oxygen and water, so that the force inside the electrolytic cell is more uniform and gas doping is avoided.

[0056] like Figure 1-2 As shown, the electrolytic cell also includes:

[0057] A cathode terminal plate 40 and an anode terminal plate 50 provided at both ends of the electrolytic cell;

[0058] A bipolar plate 60 is disposed between the cathode end plate 40 and the anode end plate 50;

[0059] A first electrolysis module 70 and a second electrolysis module 80 having the same structure, wherein the first electrolysis module 70 and the second electrolysis module 80 are respectively sandwiched between the two sides of the bipolar plate 60 through the cathode end plate 40 and the anode end plate 50, and the first electrolysis module 70 and the second electrolysis module 80 are both used for electrolyzing water to produce hydrogen;

[0060] The hydrogen channel 10 passes through the cathode end plate 40, the first electrolysis module 70 and the bipolar plate 60 from left to right in sequence and extends to the second electrolysis module 80;

[0061] The water channel 20 passes through the anode end plate 50, the second electrolysis module 80 and the bipolar plate 60 from right to left in sequence and extends into the first electrolysis module 70;

[0062] The oxygen channel 30 passes through the anode terminal plate 50 , the second electrolysis module 80 and the bipolar plate 60 from right to left in sequence and extends into the first electrolysis module 70 .

[0063] The structures of the first electrolysis module 70 and the second electrolysis module 80 are the same, and both are used to electrolyze water to produce hydrogen. The hydrogen channel 10 passes through the cathode end plate 40, the first electrolysis module 70 and the bipolar plate 60 from left to right in sequence and extends to the second electrolysis module 80, specifically to the second membrane electrode of the second electrolysis module 80, to guide the hydrogen produced by the second membrane electrode and the hydrogen produced by the first membrane electrode 72 to the outside of the electrolytic cell for collection.

[0064] The water channel 20 is used to introduce water into the electrolytic cell and input the water into the first electrolysis module 70 and the second electrolysis module 80 for electrolysis by both to produce hydrogen and oxygen. Therefore, the water channel 20 passes through the anode end plate 50, the second electrolysis module 80 and the bipolar plate 60 from right to left in sequence and extends to the first electrolysis module 70.

[0065] The oxygen channel 30 can guide the oxygen generated by electrolysis out of the electrolytic cell. The oxygen channel 30 passes through the anode end plate 50, the second electrolysis module 80 and the bipolar plate 60 from right to left in sequence and extends to the first electrolysis module 70, specifically to the first membrane electrode 72. The oxygen generated by the first membrane electrode 72 will be transported to the outside through the oxygen channel 30 together with the oxygen generated by the second membrane electrode for collection.

[0066] like Figure 2-3 As shown, the first electrolysis module 70 includes:

[0067] Cathode plate 71;

[0068] A first membrane electrode 72 is sandwiched between the cathode plate 71 and the bipolar plate 60. Two first titanium felts 73 are respectively provided on both sides of the first membrane electrode 72. The two first titanium felts 73 are respectively accommodated in the cathode plate 71 and the bipolar plate 60;

[0069] The first titanium mesh 74 is further disposed between the first titanium felt 73 contained in the bipolar plate 60 and the bipolar plate 60 .

[0070] The cathode plate 71 is used to cooperate with the bipolar plate 60 to fix the first membrane electrode 72 to ensure that the first membrane electrode 72 will not be displaced during the reaction. First titanium felts 73 are respectively arranged on both sides of the first membrane electrode 72, wherein one first titanium felt 73 is accommodated in the cathode plate 71, and the other first titanium felt 73 is accommodated in the bipolar plate 60. The function of the first titanium felt 73 accommodated in the cathode plate 71 is to collect hydrogen generated by electrolysis, and the function of the first titanium felt 73 accommodated in the bipolar plate 60 is to distribute water, so that the water introduced into the electrolytic cell through the water channel 20 is better distributed on the effective reaction area 1a of the first membrane electrode 72, so that the first membrane electrode 72 can fully react and ensure that the electrolysis efficiency is at a high level.

[0071] The first titanium mesh 74 is also arranged between the first titanium felt 73 contained in the bipolar plate 60 and the bipolar plate 60 . The function of the first titanium mesh 74 is to preliminarily distribute the liquid water so that the liquid water can be better distributed in the first titanium felt 73 .

[0072] In this embodiment, a first titanium felt 73 and a first titanium mesh 74 are arranged between the bipolar plate 60 and the first membrane electrode 72, so that the liquid water flowing into the electrolytic cell can be evenly distributed on the first membrane electrode 72, ensuring that the electrolytic cell has a high electrolysis efficiency. Compared with traditional flow fields or flow channels, the processing steps of the bipolar plate 60 can be greatly reduced, and there is no need to carve flow fields or flow channels on the bipolar plate 60, thereby saving production costs.

[0073] It should be noted here that the structure of the second electrolysis module 80 is consistent with that of the first electrolysis module 70. The second electrolysis module 80 includes an anode plate, a second membrane electrode, a second titanium felt, a second titanium mesh and other components with the same structure as those in the first electrolysis module 70, and the function of the second electrolysis module 80 is consistent with that of the first electrolysis module 70, which will not be described in detail here.

[0074] like Figure 1 As shown, the first electrolysis module 70 further includes:

[0075] A first drainage channel 75 is connected to the water channel 20 and the first titanium mesh 74 , and the first drainage channel 75 is used to guide water into the first titanium mesh 74 ;

[0076] The second drainage channel 76 is connected to the oxygen channel 30 and the first titanium mesh 74 . The second drainage channel 76 is used to guide oxygen into the oxygen channel 30 .

[0077] In this embodiment, in order to further distribute liquid water into the first electrolysis module 70, a first drainage channel 75 connecting the first titanium mesh 74 and the water channel 20 is set. The liquid water in the water channel 20 can flow into the first titanium mesh 74 through the first drainage channel 75, and enter the first titanium felt 73 after the first titanium mesh 74 initially distributes the liquid water. After the first titanium felt 73 further distributes the liquid water, the liquid water can be evenly distributed on the effective reaction area 1a of the first membrane electrode 72 for reaction.

[0078] In order to collect oxygen as soon as possible, a second drainage channel 76 is set between the oxygen channel 30 and the first titanium mesh 74. The second drainage channel 76 can introduce the oxygen generated by electrolysis of the first membrane electrode 72 into the oxygen channel 30 to prevent oxygen from accumulating in the anode chamber (the anode chamber is the chamber between the bipolar plate 60 and the first membrane electrode 72, which is mainly used to generate oxygen. Conversely, the cathode chamber is the chamber between the cathode plate 71 and the first membrane electrode 72, which is mainly used to generate hydrogen).

[0079] The pore size of the first titanium felt 73 is smaller than that of the first titanium mesh 74 , and the projected areas of the first titanium felt 73 and the first titanium mesh 74 are equal to the area of ​​the effective reaction region 1 a of the first membrane electrode 72 .

[0080] In this embodiment, the pore size of the first titanium felt 73 is smaller than the pore size of the first titanium mesh 74. The liquid water enters the first titanium felt 73 after preliminary distribution by the first titanium mesh 74. After distribution by the first titanium felt 73, the liquid water covers the effective reaction area 1a of the first membrane electrode 72 in the form of more smiling water droplets, so that the effective reaction area 1a of the first membrane electrode 72 is fully utilized. Furthermore, the projection area of ​​the first titanium felt 73 and the first titanium mesh 74 is equal to the area of ​​the effective reaction area 1a of the first membrane electrode 72, ensuring that the effective reaction area 1a of the first membrane electrode 72 can be fully contacted with liquid water.

[0081] like Figure 1 and 5 As shown, a hydrogen guide 77 is provided in the middle of the first titanium felt 73 contained in the cathode plate 71 , and the hydrogen guide 77 is used to collect hydrogen produced from the first membrane electrode 72 .

[0082] In this embodiment, a hydrogen guide 77 is provided in the middle of the first titanium felt 73 contained in the cathode plate 71. The hydrogen guide 77 can collect the hydrogen generated by the first membrane electrode 72 and introduce it into the hydrogen channel 10. Specifically, hydrogen is generated in the cathode chamber, that is, hydrogen is generated between the first membrane electrode 72 and the cathode plate 71. The generated hydrogen enters the hydrogen guide 77 after being guided by the first titanium felt 73. The function of the first titanium felt 73 contained in the cathode plate 71 here is to conduct hydrogen to prevent hydrogen from accumulating in the cathode chamber and failing to enter the hydrogen channel 10 for transportation in the first time.

[0083] The hydrogen guide 77 includes a cross flow channel 771 , which is in communication with the first titanium felt 73 contained in the cathode plate 71 , and the intersection of the cross flow channel 771 is in communication with the hydrogen channel 10 .

[0084] The cross flow channel 771 is in communication with the first titanium felt 73 , and can collect the hydrogen diffused into the first titanium felt 73 , and then transport it to the hydrogen channel 10 .

[0085] like Figure 1-3 As shown, the first electrolysis module 70 further includes a cathode insulating plate 78 , which is sandwiched between the cathode end plate 40 and the cathode plate 71 , and is used to prevent leakage of the electrolytic cell.

[0086] The cathode insulating plate 78 (made of PTFE) prevents the electrolytic cell from being conductive and avoids leakage. On the other hand, it also plays a sealing role to prevent the generated hydrogen from leaking out from between the cathode plate 71 and the cathode end plate 40. Similarly, the second electrolysis module 80 also includes an anode insulating plate. The function of the anode insulating plate is similar to that of the cathode insulating plate 78, both of which play a role in preventing leakage and sealing.

[0087] like Figure 4 As shown, a plurality of thread grooves 781 are provided on one side of the cathode plate 71 close to the cathode insulating plate 78, and the plurality of thread grooves 781 play a role of multiple sealing.

[0088] Several thread grooves 781 are in contact with the cathode insulating plate 78, and a combination of line sealing and surface sealing is adopted to form multiple sealing rings at the contact points between the thread grooves 781 and the cathode insulating plate 78, thereby effectively preventing gas leakage (similarly, there is a same sealing structure between the anode insulating plate and the anode plate, which also serves the function of sealing).

[0089] A hydrogen compressor comprises the above-mentioned PEM electrolyzer.

[0090] Although the present invention is disclosed through the above embodiments, the protection scope of the present invention is not limited thereto. Without departing from the concept of the present invention, any deformation, replacement, etc. made to the above components shall fall within the scope of the claims of the present invention.

Claims

1. A PEM electrolyzer, characterized in that: include: A hydrogen channel is provided on the center line of the electrolyzer, and is used to guide the generated hydrogen; A water channel and an oxygen channel are symmetrically arranged on both sides of the hydrogen channel, and the water channel is located above the oxygen channel. The water channel is used to transport water, and the oxygen channel is used to export the generated oxygen. The hydrogen channel, the water channel and the oxygen channel are located on the same central axis; The hydrogen channel is communicated with one end of the electrolytic cell, and the water channel and the oxygen channel are both communicated with the other end of the electrolytic cell.

2. A PEM electrolyzer according to claim 1, characterized in that: The electrolytic cell also includes: Cathode terminal plates and anode terminal plates provided at both ends of the electrolytic cell; A bipolar plate, disposed between the cathode end plate and the anode end plate; A first electrolysis module and a second electrolysis module having the same structure, wherein the first electrolysis module and the second electrolysis module are respectively sandwiched on both sides of the bipolar plate through a cathode end plate and an anode end plate, and the first electrolysis module and the second electrolysis module are both used for electrolyzing water to produce hydrogen; The hydrogen channel passes through the cathode end plate, the first electrolysis module and the bipolar plate from left to right in sequence and extends to the second electrolysis module; The water channel passes through the anode end plate, the second electrolysis module and the bipolar plate from right to left in sequence and extends into the first electrolysis module; The oxygen channel passes through the anode terminal plate, the second electrolysis module and the bipolar plate in sequence from right to left and extends into the first electrolysis module.

3. A PEM electrolyzer according to claim 2, characterized in that: The first electrolysis module comprises: cathode plate; A first membrane electrode is sandwiched between the cathode plate and the bipolar plate, two first titanium felts are respectively provided on both sides of the first membrane electrode, and the two first titanium felts are respectively accommodated in the cathode plate and the bipolar plate; A first titanium mesh is disposed between the first titanium felt contained in the bipolar plate and the bipolar plate.

4. A PEM electrolyzer according to claim 3, characterized in that: The first electrolysis module further comprises: a first drainage channel, connecting the waterway channel and the first titanium mesh, wherein the first drainage channel is used to guide water into the first titanium mesh; The second drainage channel is connected to the oxygen channel and the first titanium mesh, and the second drainage channel is used to guide oxygen into the oxygen channel.

5. A PEM electrolyzer according to claim 3, characterized in that: The pore size of the first titanium felt is smaller than that of the first titanium mesh, and the projected areas of the first titanium felt and the first titanium mesh are equal to the area of ​​the effective reaction region of the first membrane electrode.

6. A PEM electrolyzer according to claim 3, characterized in that: A hydrogen guide is arranged in the middle of the first titanium felt contained in the cathode plate, and the hydrogen guide is used to collect hydrogen produced from the first membrane electrode.

7. A PEM electrolyzer according to claim 6, characterized in that: The hydrogen guide comprises a cross flow channel, the cross flow channel is communicated with the first titanium felt contained in the cathode plate, and the intersection of the cross flow channel is communicated with the hydrogen channel.

8. A PEM electrolyzer according to claim 3, characterized in that: The first electrolysis module further includes a cathode insulating plate, which is sandwiched between the cathode end plate and the cathode plate, and is used to prevent the electrolytic cell from leaking electricity.

9. A PEM electrolyzer according to claim 8, characterized in that: A plurality of thread grooves are arranged on one side of the cathode plate close to the cathode insulating plate, and the plurality of thread grooves play a role of multiple sealing.

10. A hydrogen compressor, characterized in that: Comprising a PEM electrolyzer as described in any one of claims 1-9.

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