Bipolar plate for PEM hydrogen production and electrolytic cell

Abstract

The invention provides a bipolar plate for PEM hydrogen production and an electrolytic bath, and relates to the technical field of water electrolysis hydrogen production. The bipolar plate for PEM hydrogen production comprises a plate body, the plate body is provided with an anode flow field and a cathode flow field, the first end side of the cathode flow field is provided with a water inlet, and the water inlet is communicated with a first cathode side water rectification channel and further communicated with an anode side water rectification channel of the anode flow field through a first water through-flow opening. The second end side of the cathode flow field is provided with a water outlet and a second cathode side water rectification channel, the anode side water rectification channel is communicated with the second cathode side water rectification channel through a second water through-flow port, and the second cathode side water rectification channel is communicated with the water outlet; the plate body is further provided with a hydrogen outlet, the cathode flow field is provided with a cathode side hydrogen confluence channel, the anode flow field is provided with an anode side hydrogen confluence channel, the cathode side hydrogen confluence channel is communicated with the anode side hydrogen confluence channel, and the anode side hydrogen confluence channel is communicated with the hydrogen outlet. The integration level is improved, and the overall structure is simplified.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and provides a bipolar plate and an electrolyzer for PEM hydrogen production. Background Art

[0002] Green hydrogen plays an important role as an energy carrier in many fields such as energy and chemical industry. Using renewable energy to electrolyze water to produce hydrogen is conducive to solving the problems of wind and solar resource consumption and grid connection stability.

[0003] In the prior art, the core of a PEM electrolyzer is formed by alternately stacking bipolar plates, membrane electrodes, porous transport layers, pole frames, seals, etc., and then pressing and fastening them. Patent CN118028841A discloses a PEM electrolyzer, in which each electrolysis unit of the core part includes a pair of pole plates, an anode layer assembly, a pair of pole frames, a cathode layer assembly, a proton exchange membrane, and a sealing gasket. This type of structure has many components, is complex to assemble, and has a high pole frame processing cost, which is not conducive to the optimization and improvement of the electrolyzer structure. Patent CN202010992888.7 discloses a conductive separator with a gas-liquid distribution flow field structure, which integrates functional partitions such as sealant wire troughs, guide grooves, gas channels, and liquid channels into the same component, and the plate-frame assembly is no longer separated from the conductive separator body, thereby improving the structural reliability. The assembly quality and positioning accuracy of the stack are guaranteed, but the bridge area has no support design, resulting in the problem of mutual leakage of hydrogen and oxygen between the cathode and anode. In order to solve the problem of no support in the bridge area, patent CN117568839A sets a supporting cover plate in the bridge area to ensure high-pressure sealing. However, the cover plate component needs to be welded to the bipolar plate body, which increases the manufacturing steps, and the processing accuracy of the cover plate size is likely to have an adverse effect on the sealing. Summary of the invention

[0004] The embodiment of the present invention provides a bipolar plate and an electrolyzer for PEM hydrogen production, which are used to solve the defect in the related art that the bipolar plate needs to be provided with a support cover plate, which is not conducive to achieving high integration of the bipolar plate, and improve the integration of the bipolar plate.

[0005] A bipolar plate for PEM hydrogen production provided by the present invention comprises a plate body, wherein an anode flow field is provided on a first side of the plate body, a cathode flow field is provided on a second side of the plate body opposite to the first side, a water inlet is provided on a first end side of the cathode flow field, the water inlet is connected to a first cathode side water rectifying channel, the first cathode side water rectifying channel is connected to an anode side water rectifying channel of the anode flow field through a first water permeable port, a water outlet and a second cathode side water rectifying channel are provided on a second end side of the cathode flow field opposite to the first end side, the anode side water rectifying channel is connected to the second cathode side water rectifying channel through a second water permeable port, and the second cathode side water rectifying channel is connected to the water outlet; The plate body is also provided with a hydrogen outlet, the cathode flow field is provided with a cathode side hydrogen converging channel, the anode flow field is provided with an anode side hydrogen converging channel, the cathode side hydrogen converging channel is connected with the anode side hydrogen converging channel, and the anode side hydrogen converging channel is connected with the hydrogen outlet.

[0006] According to an embodiment of the present invention, the hydrogen outlet is disposed on both the first end side and the second end side of the cathode flow field.

[0007] According to one embodiment of the present invention, a plurality of hydrogen outlets are arranged on the first end side of the anode flow field, a first anode side hydrogen flow port and a first anode side hydrogen confluence channel are arranged on the first end side of the anode flow field, the first anode side hydrogen confluence channel is connected with the cathode side hydrogen confluence channel through the first anode side hydrogen flow port, and the first anode side hydrogen confluence channel is connected with the hydrogen outlet.

[0008] According to one embodiment of the present invention, a plurality of hydrogen outlets are arranged on the second end side of the anode flow field opposite to the first end side of the anode flow field, and a second anode side hydrogen flow port and a second anode side hydrogen confluence channel are arranged on the second end side of the anode flow field, the second anode side hydrogen confluence channel is connected with the cathode side hydrogen confluence channel through the second anode side hydrogen flow port, and the second anode side hydrogen confluence channel is connected with the hydrogen outlet located on the same end side.

[0009] According to one embodiment of the present invention, a first sealing groove is provided on the outer circumference of the anode flow field, a first sealing member is provided in the first sealing groove, and a second sealing member is provided in the outer circumference of the cathode flow field.

[0010] According to one embodiment of the present invention, a third sealing groove is provided on the outer circumference of the water inlet, a third sealing member is provided in the third sealing groove, and a fourth sealing member is provided in the outer circumference of the water outlet.

[0011] According to one embodiment of the present invention, the cathode flow field is provided with a fifth sealing groove, the first water permeable port and the first cathode side water rectifying channel are located in a frame formed by the fifth sealing groove, and a fifth sealing member is provided in the fifth sealing groove; The cathode flow field is further provided with a sixth sealing groove, the second water permeable opening and the second cathode side water rectifying channel are located in the frame formed by the sixth sealing groove, and a sixth sealing member is provided in the sixth sealing groove.

[0012] According to an embodiment of the present invention, the cathode flow field is further provided with a seventh sealing groove, the outer peripheral side of the hydrogen outlet is provided with the seventh sealing groove, and a seventh sealing member is provided in the seventh sealing groove.

[0013] According to one embodiment of the present invention, the anode flow field is further provided with an eighth sealing groove, the first anode side hydrogen permeable port and the first anode side hydrogen converging channel are located in a frame formed by the eighth sealing groove, and an eighth sealing member is provided in the eighth sealing groove.

[0014] The present invention also provides a PEM electrolyzer for hydrogen production, comprising the bipolar plate for hydrogen production of PEM as described in any one of the above items.

[0015] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The bipolar plate and electrolyzer for PEM hydrogen production provided by the present invention include a plate body, wherein an anode flow field is provided on a first side of the plate body, a cathode flow field is provided on a second side of the plate body opposite to the first side, a water inlet is provided on a first end side of the cathode flow field, the water inlet is connected to a first cathode side water rectification channel, the first cathode side water rectification channel is connected to an anode side water rectification channel of the anode flow field through a first water permeable port, a water outlet and a second cathode side water rectification channel are provided on a second end side of the cathode flow field opposite to the first end side, the anode side water rectification channel is connected to the second cathode side water rectification channel through a second water permeable port , the second cathode side water rectifying channel is connected with the water outlet; the plate body is also provided with a hydrogen outlet, the cathode flow field is provided with a cathode side hydrogen converging channel, the anode flow field is provided with an anode side hydrogen converging channel, the cathode side hydrogen converging channel is connected with the anode side hydrogen converging channel, and the anode side hydrogen converging channel is connected with the hydrogen outlet. By integrating the anode flow field and the cathode flow field on both sides of the plate body, and realizing the connection between the cathode side water rectifying channel and the anode side water rectifying channel through the water permeable port, the setting of the supporting cover plate is omitted, the integration is improved, and the overall structure is simplified. At the same time, hydrogen and oxygen are isolated on the opposite sides to prevent hydrogen and oxygen from mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic structural diagram of the anode flow field of the first embodiment of the bipolar plate for PEM hydrogen production provided by the present invention.

[0018] Figure 2 It is a schematic structural diagram of the cathode flow field of the first embodiment of the bipolar plate for PEM hydrogen production provided by the present invention.

[0019] Figure 3The present invention provides Figure 2 Cross-sectional view of the single-chamber structure along the AA axis.

[0020] Figure 4 It is a schematic structural diagram of the anode flow field of the second embodiment of the bipolar plate for PEM hydrogen production provided by the present invention.

[0021] Figure 5 It is a schematic structural diagram of the cathode flow field of the second embodiment of the bipolar plate for PEM hydrogen production provided by the present invention.

[0022] Reference numerals: 1. Water inlet; 101. Water outlet; 2. Hydrogen outlet; 301. Anode flow field; 302. Cathode flow field; 4. Anode side water rectification channel; 5. First water permeable port; 510. Second water permeable port; 6. First anode side hydrogen permeable port; 610. Second anode side hydrogen permeable port; 7. First anode side hydrogen converging channel; 710. Second anode side hydrogen converging channel; 801. First sealing groove; 802. Second sealing groove; 9. Cathode side hydrogen converging channel; 10. First cathode side water rectification channel; 1010. Second cathode side water rectification channel; 11. First sealing member; 1110. Second sealing member; 12. Anode diffusion layer; 13. Cathode diffusion layer; 14. Membrane electrode assembly. DETAILED DESCRIPTION

[0023] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] like Figures 1 to 5 As shown, a bipolar plate for PEM hydrogen production provided by the present invention comprises a plate body, an anode flow field 301 is provided on a first side of the plate body, a cathode flow field 302 is provided on a second side of the plate body opposite to the first side, a water inlet 1 is provided on a first end side of the cathode flow field 302, the water inlet 1 is connected to a first cathode side water rectifying channel 10, the first cathode side water rectifying channel 10 is connected to an anode side water rectifying channel 4 of the anode flow field 301 through a first water permeable port 5, a water outlet 101 and a second cathode side water rectifying channel 1010 are provided on a second end side of the cathode flow field 302 opposite to the first end side, the anode side water rectifying channel 4 is connected to the second cathode side water rectifying channel 1010 through a second water permeable port 510, and the second cathode side water rectifying channel 1010 is connected to the water outlet 101; The plate body is also provided with a hydrogen outlet 2, the cathode flow field 302 is provided with a cathode side hydrogen converging channel 9, the anode flow field 301 is provided with an anode side hydrogen converging channel, the cathode side hydrogen converging channel 9 is communicated with the anode side hydrogen converging channel, and the anode side hydrogen converging channel is communicated with the hydrogen outlet 2. It can be understood that the anode flow field 301 and the cathode flow field 302 are integrated on the plate body, that is, the anode flow field 301 is provided on the first side of the plate body, and the cathode flow field 302 is provided on the second side of the plate body, and the first side and the second side are two opposite sides of the plate body.

[0025] Among them, the cathode flow field 302 is provided with a water inlet 1, a first water permeable port 5, a second water permeable port 510, a first cathode side water rectifying channel 10, a second cathode side water rectifying channel 1010 and a water outlet 101; the anode flow field 301 is provided with an anode side water rectifying channel 4. The water inlet 1 is connected with the first cathode side water rectifying channel 10, the first cathode side water rectifying channel 10 is connected with the first water permeable port 5, the first water permeable port 5 is connected with the anode side water rectifying channel 4, the anode side water rectifying channel 4 is connected with the second cathode side water rectifying channel 1010 through the second water permeable port 510, and the second cathode side water rectifying channel 1010 is connected with the water outlet 101. That is to say, the water to be electrolyzed enters the first cathode side water rectifying channel 10 from the water inlet 1, and then enters the anode side water rectifying channel 4 from the first water permeable port 5, and the water completes the electrolysis reaction in the anode side water rectifying channel 4. Correspondingly, hydrogen is generated in the cathode side hydrogen converging channel 9, and oxygen is generated in the anode side water rectifying channel 4. Then, hydrogen flows from the cathode side hydrogen converging channel 9 to the anode side hydrogen converging channel, and is collected by the hydrogen outlet 2. The water after the electrolysis reaction and the oxygen generated by electrolysis flow from the anode side water rectifying channel 4 through the second water permeable port 510 into the second cathode side water rectifying channel 1010, and are finally discharged from the water outlet 101. The isolation of hydrogen and oxygen is achieved, and by integrating the anode flow field 301 and the cathode flow field 302 on both sides of the plate body, and realizing the connection between the cathode side water rectifying channel and the anode side water rectifying channel 4 through the water permeable port, the setting of the support cover plate is omitted, the integration is improved, and the overall structure is simplified.

[0026] According to an embodiment of the present invention, the first end side and the second end side of the cathode flow field 302 are both provided with the hydrogen outlet 2. Figure 1 and Figure 2 As shown, in the first embodiment, hydrogen and oxygen are collected on the same side, that is, a hydrogen outlet 2 and a water inlet 1 are provided on the first end side of the cathode flow field 302 , and a hydrogen outlet 2 and a water outlet 101 are provided on the second end side of the cathode flow field 302 .

[0027] According to one embodiment of the present invention, a plurality of hydrogen outlets 2 are arranged at the first end side of the anode flow field 301, a first anode side hydrogen permeable opening 6 and a first anode side hydrogen converging channel 7 are arranged at the first end side of the anode flow field 301, the first anode side hydrogen converging channel 7 is connected to the cathode side hydrogen converging channel 9 through the first anode side hydrogen permeable opening 6, and the first anode side hydrogen converging channel 7 is connected to the hydrogen outlet 2. It can be understood that, if Figure 4 and Figure 5 As shown, in the second embodiment, hydrogen and oxygen are collected on opposite sides. It should be noted that the collection of hydrogen and oxygen on opposite sides in the second embodiment means that the water outlet 101 for collecting oxygen is located on the right end side of the plate body, and the hydrogen outlet 2 is located on the upper end side of the plate body.

[0028] Specifically, the first end side of the anode flow field 301 (the same as the upper end side of the plate body) is provided with a first anode side hydrogen flow port 6, a first anode side hydrogen confluence channel 7 and a plurality of hydrogen outlets 2, the first anode side hydrogen confluence channel 7 is connected with the cathode side hydrogen confluence channel 9 through the first anode side hydrogen flow port 6, and the first anode side hydrogen confluence channel 7 is connected with the hydrogen outlet 2, thereby completing the hydrogen collection at the first end side of the anode flow field 301.

[0029] According to one embodiment of the present invention, a plurality of hydrogen outlets 2 are arranged at the second end side of the anode flow field 301 opposite to the first end side of the anode flow field 301, and a second anode side hydrogen permeable opening 610 and a second anode side hydrogen converging channel 710 are arranged at the second end side of the anode flow field 301, and the second anode side hydrogen converging channel 710 is connected to the anode side water rectifying channel 4 through the second anode side hydrogen permeable opening 610, and the second anode side hydrogen converging channel 710 is connected to the hydrogen outlet 2 located at the same end side. It can be understood that, if Figure 4 and Figure 5 As shown, in the second embodiment, hydrogen and oxygen are collected on opposite sides. It should be noted that the collection of hydrogen and oxygen on opposite sides in the second embodiment means that the water outlet 101 for collecting oxygen is located on the right end side of the plate body, and the hydrogen outlet 2 is located on the upper and lower ends of the plate body.

[0030] Specifically, the second end side of the anode flow field 301 (the same as the lower end side of the plate body) is provided with a first anode side hydrogen flow port 6, a first anode side hydrogen confluence channel 7 and a plurality of hydrogen outlets 2, that is, a plurality of hydrogen outlets 2 are provided on both the upper end side and the lower end side of the plate body, the second anode side hydrogen confluence channel 710 is connected with the cathode side hydrogen confluence channel 9 through the second anode side hydrogen flow port 610, and the second anode side hydrogen confluence channel 710 is connected with the hydrogen outlet 2, thereby completing the hydrogen collection at the first end side and the second end side of the anode flow field 301.

[0031] It should also be noted that the anode flow field 301 is made through two processes. The first process uses mechanical polishing or etching to form a whole-surface sinking area on the first side of the plate body. The second process uses fine carving or etching to sink and form a flow channel. The bridge area of ​​the cathode flow field 302 is processed by fine carving or etching on the second side of the plate body to form a mechanical flow channel for the material. Laser cutting is used to process the material flow holes.

[0032] According to one embodiment of the present invention, a first sealing groove 801 is provided on the outer peripheral side of the anode flow field 301, and a first sealing member 11 is provided in the first sealing groove 801. A second sealing groove 802 is provided on the outer peripheral side of the cathode flow field 302, and a second sealing member 1110 is provided in the second sealing groove 802. It can be understood that in order to improve the sealing performance of the anode flow field 301 and the cathode flow field 302, a first sealing groove 801 is provided on the outer peripheral side of the anode flow field 301, the first sealing groove 801 is located in the first side surface of the plate body, and a first sealing member 11 is provided in the first sealing groove 801. A second sealing groove 802 is provided on the outer peripheral side of the cathode flow field 302, the second sealing groove 802 is located in the second side surface of the plate body, and a second sealing member 1110 is provided in the second sealing groove 802. The first sealing groove 801 and the first sealing member 11 cooperate with the anode of the membrane electrode assembly 14 to form a seal; the second sealing groove 802 and the second sealing member 1110 cooperate with the cathode of the membrane electrode assembly 14 to form a seal.

[0033] According to an embodiment of the present invention, a third sealing groove is provided on the outer circumference of the water inlet 1, and a third sealing member is provided in the third sealing groove. A fourth sealing groove is provided on the outer circumference of the water outlet 101, and a fourth sealing member is provided in the fourth sealing groove. Figure 4 As shown, in the second embodiment, the anode flow field 301 is provided with a third sealing groove, the third sealing groove is located on the outer peripheral side of the water inlet 1, and a third sealing member is provided in the third sealing groove. The anode flow field 301 is also provided with a fourth sealing groove, the fourth sealing groove is located on the outer peripheral side of the water outlet 101, and a fourth sealing member is provided in the fourth sealing groove. The water inlet 1 and the water outlet 101 are sealed.

[0034] According to one embodiment of the present invention, the cathode flow field 302 is provided with a fifth sealing groove, the first water permeable port 5 and the first cathode side water rectifying channel 10 are located in the frame formed by the fifth sealing groove, and a fifth sealing member is provided in the fifth sealing groove; The cathode flow field 302 is further provided with a sixth sealing groove, the second water permeable opening 510 and the second cathode side water rectifying channel 1010 are located in the frame formed by the sixth sealing groove, and a sixth sealing member is provided in the sixth sealing groove.

[0035] According to an embodiment of the present invention, the cathode flow field 302 is further provided with a seventh sealing groove, the outer peripheral side of the hydrogen outlet 2 is provided with the seventh sealing groove, and a seventh sealing member is provided in the seventh sealing groove.

[0036] According to one embodiment of the present invention, the anode flow field 301 is further provided with an eighth sealing groove, the first anode side hydrogen permeable port 6 and the first anode side hydrogen converging channel 7 are located in the frame formed by the eighth sealing groove, and an eighth sealing member is provided in the eighth sealing groove.

[0037] According to one embodiment of the present invention, the anode flow field 301 is further provided with a ninth sealing groove, the second anode side hydrogen permeable port 610 and the second anode side hydrogen converging channel 710 are located in the frame formed by the ninth sealing groove, and a ninth sealing member is provided in the ninth sealing groove.

[0038] It should be noted that the first seal 11, the second seal 1110, the third seal, the fourth seal, the fifth seal, the sixth seal, the seventh seal, the eighth seal and the ninth seal may use rubber pads or rubber rings to improve the sealing performance.

[0039] The present invention also provides a PEM electrolyzer for hydrogen production, including a bipolar plate for PEM hydrogen production. It also includes an anode diffusion layer 12, a cathode diffusion layer 13 and a membrane electrode assembly 14, which are assembled as follows: Figure 3 As shown, no further details are given.

[0040] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The bipolar plate and electrolyzer for PEM hydrogen production provided by the present invention include a plate body, wherein an anode flow field is provided on a first side of the plate body, a cathode flow field is provided on a second side of the plate body opposite to the first side, a water inlet is provided on a first end side of the cathode flow field, the water inlet is connected to a first cathode side water rectification channel, the first cathode side water rectification channel is connected to an anode side water rectification channel of the anode flow field through a first water permeable port, a water outlet and a second cathode side water rectification channel are provided on a second end side of the cathode flow field opposite to the first end side, The anode side water rectifying channel is connected with the second cathode side water rectifying channel through the second water permeable port, and the second cathode side water rectifying channel is connected with the water outlet; the plate body is also provided with a hydrogen outlet, and the hydrogen outlet is connected with the anode side water rectifying channel. By integrating the anode flow field and the cathode flow field on both sides of the plate body, and realizing the connection between the cathode side water rectifying channel and the anode side water rectifying channel through the water permeable port, the setting of the supporting cover plate is omitted, the integration is improved, and the overall structure is simplified. At the same time, hydrogen and oxygen are isolated on different sides to prevent hydrogen and oxygen from mixing.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bipolar plate for PEM hydrogen production, characterized in that: A plate body is included, wherein an anode flow field is provided on a first side surface of the plate body, a cathode flow field is provided on a second side surface of the plate body opposite to the first side surface, a water inlet is provided on a first end side of the cathode flow field, the water inlet is connected to a first cathode side water rectifying channel, the first cathode side water rectifying channel is connected to an anode side water rectifying channel of the anode flow field through a first water permeable port, a water outlet and a second cathode side water rectifying channel are provided on a second end side of the cathode flow field opposite to the first end side, the anode side water rectifying channel is connected to the second cathode side water rectifying channel through a second water permeable port, and the second cathode side water rectifying channel is connected to the water outlet; The plate body is also provided with a hydrogen outlet, the cathode flow field is provided with a cathode side hydrogen converging channel, the anode flow field is provided with an anode side hydrogen converging channel, the cathode side hydrogen converging channel is connected with the anode side hydrogen converging channel, and the anode side hydrogen converging channel is connected with the hydrogen outlet.

2. The bipolar plate for PEM hydrogen production according to claim 1, characterized in that: The hydrogen outlet is disposed on the first end side and the second end side of the cathode flow field.

3. The bipolar plate for PEM hydrogen production according to claim 1, characterized in that: A plurality of hydrogen outlets are arranged on the first end side of the anode flow field, and a first anode side hydrogen flow port and a first anode side hydrogen confluence channel are arranged on the first end side of the anode flow field, the first anode side hydrogen confluence channel is connected with the cathode side hydrogen confluence channel through the first anode side hydrogen flow port, and the first anode side hydrogen confluence channel is connected with the hydrogen outlet.

4. The bipolar plate for PEM hydrogen production according to claim 1 or 3, characterized in that: A plurality of hydrogen outlets are arranged on the second end side of the anode flow field opposite to the first end side of the anode flow field, and a second anode side hydrogen flow port and a second anode side hydrogen confluence channel are arranged on the second end side of the anode flow field, the second anode side hydrogen confluence channel is connected with the cathode side hydrogen confluence channel through the second anode side hydrogen flow port, and the second anode side hydrogen confluence channel is connected with the hydrogen outlet located on the same end side.

5. The bipolar plate for PEM hydrogen production according to claim 1, characterized in that: A first sealing groove is provided on the outer peripheral side of the anode flow field, and a first sealing member is provided in the first sealing groove. A second sealing groove is provided on the outer peripheral side of the cathode flow field, and a second sealing member is provided in the second sealing groove.

6. The bipolar plate for PEM hydrogen production according to claim 1, characterized in that: A third sealing groove is provided on the outer peripheral side of the water inlet, a third sealing member is provided in the third sealing groove, a fourth sealing groove is provided on the outer peripheral side of the water outlet, and a fourth sealing member is provided in the fourth sealing groove.

7. The bipolar plate for PEM hydrogen production according to claim 6, characterized in that: The cathode flow field is provided with a fifth sealing groove, the first water permeable opening and the first cathode side water rectifying channel are located in a frame formed by the fifth sealing groove, and a fifth sealing member is provided in the fifth sealing groove; The cathode flow field is further provided with a sixth sealing groove, the second water permeable opening and the second cathode side water rectifying channel are located in the frame formed by the sixth sealing groove, and a sixth sealing member is provided in the sixth sealing groove.

8. The bipolar plate for PEM hydrogen production according to claim 3, characterized in that: The cathode flow field is further provided with a seventh sealing groove, the outer peripheral side of the hydrogen outlet is provided with the seventh sealing groove, and a seventh sealing member is provided in the seventh sealing groove.

9. The bipolar plate for PEM hydrogen production according to claim 8, characterized in that: The anode flow field is also provided with an eighth sealing groove, the first anode side hydrogen permeable port and the first anode side hydrogen converging channel are located in the frame formed by the eighth sealing groove, and an eighth sealing member is provided in the eighth sealing groove.

10. A PEM electrolyzer for hydrogen production, characterized in that: It comprises a bipolar plate for PEM hydrogen production as described in any one of claims 1 to 9.

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