Electrolytic hydrogen production bipolar plate and electrolytic hydrogen production device

Abstract

The invention relates to the technical field of electrolytic baths, and provides an electrolytic hydrogen production bipolar plate and an electrolytic hydrogen production device.The electrolytic hydrogen production bipolar plate comprises a flow field area and a plurality of flow field groove ridges, the flow field groove ridges are arranged in the flow field area in the first direction, grooves between every two adjacent flow field groove ridges form straight flow channels, the number of the straight flow channels is an odd number, and the flow field groove ridges are arranged in the flow field area. The center line of the bipolar plate in the first direction is located at the joint of the flow field groove ridge and the straight flow channel, the straight flow channel extends in the second direction, and the first direction is perpendicular to the second direction. By means of the design of the straight flow channel, electrolyte can smoothly flow in the linear direction, the design and manufacturing difficulty of the stamping die is reduced, and the production cost is reduced; according to the invention, a pair of bipolar plates can be assembled in a manner of relatively rotating by 180 degrees in a superposed manner, so that the bottom of the straight flow channel of one bipolar plate corresponds to the top of the flow field groove ridge of the other bipolar plate, mutual concave-convex inlaying of the upper and lower flow channels is effectively avoided, and the risk of damage to the MEA membrane electrode between the pair of bipolar plates is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolyzers, and in particular to a bipolar plate for electrolytic hydrogen production and an electrolytic hydrogen production device. Background Art

[0002] In electrolyzer design, the double-stamped bipolar plate (SBP) is a key component. Conventional SBPs typically utilize wavy flow channels. This design aims to create a cross-over flow channel when the upper and lower plates are stacked. This prevents overlapping ridges and grooves, creating a concave-convex mosaic and potentially damaging the MEA membrane electrode between the plates.

[0003] However, bipolar plates with wavy flow channels have some drawbacks. For example, the wavy channel design results in a complex flow field and high flow resistance, which to some extent affects electrolysis efficiency. Furthermore, the complex channel shape increases the difficulty of plate stamping, hindering large-scale production and cost control. Summary of the Invention

[0004] The present invention provides an electrolytic hydrogen production bipolar plate and an electrolytic hydrogen production device, which are used to solve the problems in the prior art of complex flow field and large flow resistance of the electrolytic cell bipolar plate, which affect the electrolysis efficiency.

[0005] The present invention provides a bipolar plate for producing hydrogen by electrolysis, comprising: flow field area; Multiple flow field ridges are arranged in the flow field area along a first direction, and the grooves between two adjacent flow field ridges form a direct current channel. The number of the direct current channels is an odd number, and the center line of the bipolar plate along the first direction is located at the intersection of the flow field ridge and the direct current channel. The direct current channel extends along a second direction, and the first direction is perpendicular to the second direction.

[0006] According to the bipolar plate for hydrogen production by electrolysis provided by the present invention, the cross-sectional shape of the direct current channel along the first direction is trapezoidal or arc-shaped.

[0007] According to a bipolar plate for hydrogen production by electrolysis provided by the present invention, a first diversion area and a second diversion area are respectively provided at both ends of the flow field area. The first diversion area and the second diversion area are both connected to the flow field area and are respectively used to distribute and collect reaction gas and coolant.

[0008] According to a bipolar plate for hydrogen production by electrolysis provided by the present invention, the outer side of the first diversion area is provided with: a first hydrogen cavity port, connected to the flow field region through a first diversion region, for inputting hydrogen; The first water-oxygen chamber port is used for inputting oxygen and coolant, including: a first oxygen channel, the first oxygen channel being in communication with the flow field region; A first coolant channel is integrated into the first flow dividing area.

[0009] According to a bipolar plate for hydrogen production by electrolysis provided by the present invention, the outer side of the second diversion area is provided with: a second hydrogen cavity port, the second hydrogen cavity port being connected to the flow field region through a second diversion region and being used for outputting hydrogen; The second water-oxygen chamber port is used for output of oxygen and coolant, including: a second oxygen channel, the second oxygen channel being in communication with the flow field region; A second coolant channel is integrated into the second flow dividing area.

[0010] According to a bipolar plate for hydrogen production by electrolysis provided by the present invention, a pair of first hydrogen cavity openings are provided, and the pair of first hydrogen cavity openings are provided on both sides of the first water-oxygen cavity opening, and a sealing ring is provided around the first hydrogen cavity opening and the first water-oxygen cavity opening.

[0011] According to a bipolar plate for hydrogen production by electrolysis provided by the present invention, a pair of second hydrogen cavity ports are provided, and the pair of second hydrogen cavity ports are provided on both sides of the second water-oxygen cavity port, and a sealing ring is provided around the second hydrogen cavity port and the second water-oxygen cavity port.

[0012] According to a bipolar plate for hydrogen production by electrolysis provided by the present invention, the first hydrogen cavity port, the first water-oxygen cavity port, and the first diversion area are symmetrical with the second hydrogen cavity port, the second water-oxygen cavity port, and the second diversion area about the center of the bipolar plate.

[0013] According to a bipolar plate for hydrogen production by electrolysis provided by the present invention, a flow guiding structure is provided inside the first diversion area and the second diversion area. The flow guiding structure is adapted to the direct current channel for uniformly distributing the electrolyte or reaction gas.

[0014] In a second aspect, the present invention provides an electrolytic hydrogen production device, comprising: The bipolar plate is the bipolar plate for hydrogen production by electrolysis described in the first aspect; The MEA membrane electrode is arranged between a pair of bipolar plates, and one of the bipolar plates is assembled relative to and overlapped with the other bipolar plate by rotating 180°, so that the bottom of the direct current channel of one bipolar plate corresponds to the top of the flow field groove ridge of the other bipolar plate.

[0015] The present invention provides a bipolar plate for hydrogen production by electrolysis, comprising a flow field region and a plurality of flow field ridges, wherein the plurality of flow field ridges are arranged in the flow field region along a first direction, and a groove between two adjacent flow field ridges forms a direct current channel. The number of direct current channels is an odd number, and the centerline of the bipolar plate along the first direction is located at the intersection of the flow field ridge and the direct current channel. Compared with traditional wavy flow channels, the present invention, on the one hand, greatly simplifies the flow field by adopting the direct current channel design, avoids the problem that the wavy flow channel causes the electrolyte to frequently change flow direction when flowing, increases flow resistance, and affects electrolysis efficiency. The present invention enables the electrolyte to flow smoothly in a straight direction, reduces friction with the flow channel wall, significantly improves electrolysis efficiency, and reduces energy consumption. On the other hand, it can facilitate the stamping and forming of bipolar plates. Since the traditional wavy flow channel has a complex shape, it increases the difficulty of stamping and forming the bipolar plate, increases the mold precision requirements and production costs, and reduces the product yield. By adopting a direct current channel design, the shape rules are simple, which reduces the difficulty of designing and manufacturing the stamping mold, improves the product yield, and thus reduces the production cost; and the number of direct current channels is an odd number, and the design with the center line located at the intersection of the flow field groove ridge and the direct current channel allows the upper and lower plates to be rotated 180° and assembled relative to each other, so that the bottom of the direct current channel of one bipolar plate corresponds to the top of the flow field groove ridge of the other bipolar plate, that is, the upper plate groove and the lower plate ridge overlap, effectively avoiding the upper and lower flow channels from being concave and convex inlaid with each other, reducing the risk of damage to the MEA membrane electrode between a pair of bipolar plates, and improving the stability and service life of the electrolyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to 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 any creative work.

[0017] Figure 1 This is a structural schematic diagram of a bipolar plate for hydrogen production by electrolysis provided by an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Cross-sectional view along AA direction.

[0019] Figure 3 It is a cross-sectional view of a pair of bipolar plates in a stacked state provided by an embodiment of the present invention.

[0020] Reference numerals: 1. Flow field area; 2. Flow field ridge; 3. DC channel; 4. First diversion area; 5. Second diversion area; 6. First hydrogen cavity opening; 7. First water-oxygen cavity opening; 8. Second hydrogen cavity opening; 9. Second water-oxygen cavity opening; 10. Sealing ring. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] The following combination Figure 1-Figure 3 The present invention describes a bipolar plate for producing hydrogen by electrolysis and a device for producing hydrogen by electrolysis.

[0023] Reference Figure 1 and Figure 2 An embodiment of the present invention provides a bipolar plate for hydrogen production by electrolysis, comprising a flow field region 1 and a plurality of flow field ridges 2. The plurality of flow field ridges 2 are arranged in the flow field region 1 along a first direction. The grooves between two adjacent flow field ridges 2 form a direct current channel 3. The number of direct current channels 3 is an odd number, and the center line of the bipolar plate along the first direction is located at the intersection of the flow field ridge 2 and the direct current channel 3. The direct current channel 3 extends along a second direction, and the first direction is perpendicular to the second direction.

[0024] It can be seen from the above scheme that compared with the traditional wavy flow channel, on the one hand, the design of the straight channel 3 of the present invention greatly simplifies the flow field, avoids the problem that the wavy flow channel causes the electrolyte to frequently change the flow direction when flowing, increases the flow resistance, and affects the electrolysis efficiency; it can allow the electrolyte to flow smoothly in a straight line direction, reduce the friction with the flow channel wall, significantly improve the electrolysis efficiency, and reduce energy consumption; on the other hand, it can facilitate the stamping of bipolar plates. Since the traditional wavy flow channel has a complex shape, it increases the difficulty of stamping the bipolar plate, increases the mold precision requirements and production costs, and also reduces the product yield. By adopting the straight The design of the flow channel 3 has a regular and simple shape, which reduces the difficulty of designing and manufacturing the stamping die, improves the product yield, and thus reduces production costs; and the number of direct current channels 3 is an odd number, and the design with the center line located at the intersection of the flow field groove ridge 2 and the direct current channel 3 allows a pair of bipolar plates to be assembled by rotating 180° relative to each other and stacking them, so that the bottom of the direct current channel 3 of one bipolar plate corresponds to the top of the flow field groove ridge 2 of the other bipolar plate, that is, the upper plate groove and the lower plate ridge overlap, effectively avoiding the concave and convex inlay of the upper and lower flow channels, reducing the risk of damage to the MEA membrane electrode between a pair of bipolar plates, and improving the stability and service life of the electrolyzer.

[0025] In this embodiment, the shape of the bipolar plate is rectangular, the first direction is the width direction, and the second direction is the length direction. Figure 2As shown, the cross-sectional shape of the direct current channel 3 along the first direction is trapezoidal, and the flow field ridge 2 is a straight edge. Of course, the cross-sectional shape of the direct current channel 3 along the first direction can also be an arc, and the flow field ridge 2 can also be an arc.

[0026] In this embodiment, a first diversion area 4 and a second diversion area 5 are respectively provided on both sides of the flow field area 1. The first diversion area 4 and the second diversion area 5 are both connected to the flow field area 1 and are used to distribute and collect the reaction gas and the coolant respectively.

[0027] With such a configuration, in the process of hydrogen production by electrolysis, the uniform distribution of the reaction gas and the coolant is crucial to the reaction efficiency. The first diversion area 4 and the second diversion area 5 can reasonably distribute the reaction gas and the coolant entering the bipolar plate, so that they enter the flow field area 1 evenly, ensuring that all parts of the flow field area 1 can fully participate in the electrolysis reaction, thereby effectively improving the electrolysis efficiency; after the electrolysis reaction is completed, corresponding reaction products will be produced. The first diversion area 4 and the second diversion area 5 are not only responsible for distributing the incoming substances, but also for collecting the gases produced by the reaction and the used coolant, and the reaction products produced by the flow field area 1 will be distributed to the reaction products. The products are collected and guided out of the bipolar plates in a timely manner, ensuring that the accumulation of reaction products in flow field area 1 will not affect the subsequent reactions, maintaining the continuous and stable progress of the electrolysis reaction, and also helping to improve the operating efficiency of the entire electrolysis hydrogen production system; by distributing and collecting the reaction gas and coolant, the first diversion area 4 and the second diversion area 5 effectively reduce the pressure fluctuations and local overheating in the flow field. The stable pressure and temperature environment helps to extend the service life of the bipolar plates and other system components, reduce the probability of system failures, and enable the electrolysis hydrogen production equipment to operate more stably and reliably.

[0028] Preferably, the structures on both sides of the flow field area 1 of the bipolar plate are symmetrical about the center of the bipolar plate. That is, even after the bipolar plate is rotated 180° around its center, the left side structure of the flow field area 1 can overlap with the right side structure of the flow field area 1, thereby not affecting the upper and lower stacking assembly of the two bipolar plates, thereby improving the assembly efficiency.

[0029] like Figure 1 As shown, a first hydrogen cavity port 6 and a first water-oxygen cavity port 7 are provided on the outside of the first diversion area 4; wherein, the first hydrogen cavity port 6 is connected to the flow field area 1 through the first diversion area 4 for inputting hydrogen; the first water-oxygen cavity port 7 is used for inputting oxygen and coolant, and the first water-oxygen cavity port 7 includes a first oxygen channel and a first coolant channel, the first oxygen channel is connected to the flow field area 1, and the first coolant channel is integrated in the first diversion area 4.

[0030] With this arrangement, the first hydrogen cavity port 6 is connected to the flow field area 1 through the first diversion area 4, so that hydrogen can be accurately transported to the flow field area 1 to participate in the reaction. In the electrolytic hydrogen production reaction, hydrogen is a key reactant, and its stable and efficient supply is the key to ensuring the smooth progress of the reaction. The coordinated work of the first hydrogen cavity port 6 and the first diversion area 4 ensures that hydrogen can reach each reaction site of the flow field area 1 evenly and in a timely manner, thereby improving the utilization efficiency of hydrogen and thus improving the efficiency of the entire electrolysis reaction; the first water-oxygen cavity port 7 integrates the first oxygen channel and the first coolant channel. This integrated design optimizes the transmission mode of oxygen and coolant. The first coolant channel is integrated in the first diversion area 4, so that The coolant can be evenly distributed in the first diversion area 4 before entering the flow field area 1, which better achieves uniform distribution of the coolant and avoids the problem of local overheating in the flow field area 1, thereby ensuring the stable performance of key components such as the MEA membrane electrode and extending the service life of the bipolar plate and the entire electrolyzer; the first oxygen channel is directly connected to the flow field area 1 and is independent of the first coolant channel, effectively avoiding mutual interference between oxygen and coolant during the transmission process. In the electrolytic hydrogen production reaction, oxygen is a reaction product and needs to be discharged from the system in time, while the coolant is used to maintain the system temperature. This design ensures that oxygen and coolant are independently and efficiently transmitted, ensuring the normal progress of the electrolytic hydrogen production reaction.

[0031] In this embodiment, a second hydrogen cavity port 8 and a second water-oxygen cavity port 9 are provided on the outside of the second diversion area 5, wherein the second hydrogen cavity port 8 is connected to the flow field area 1 through the second diversion area 5 for outputting hydrogen; the second water-oxygen cavity port 9 is used for outputting oxygen and coolant, and the second water-oxygen cavity port 9 includes a second oxygen channel and a second coolant channel, the second oxygen channel is connected to the flow field area 1, and the second coolant channel is integrated in the second diversion area 5.

[0032] With this arrangement, the second hydrogen chamber port 8 and the second water-oxygen chamber port 9 respectively undertake the output tasks of hydrogen, oxygen and coolant. In the electrolytic hydrogen production reaction, the generated hydrogen passes through the second hydrogen chamber port 8 and the second diversion area 5 and is orderly output from the flow field area 1. This design ensures that hydrogen can leave the reaction area quickly and smoothly, avoiding hydrogen accumulation in the flow field, thereby maintaining the positive progress of the reaction and improving the electrolysis efficiency; for oxygen and coolant, the second oxygen channel of the second water-oxygen chamber port 9 and the second coolant channel integrated in the second diversion area 5 enable them to be discharged independently and efficiently. The timely discharge of oxygen ensures the stability of the reaction environment, and the smooth outflow of the coolant takes away the excess heat generated by the reaction, preventing the equipment from being damaged by overheating. Ensure the continuous and stable operation of the system; in addition, the timely output of hydrogen, oxygen and coolant ensures the stability and continuity of the reaction. As the reaction proceeds, if the product cannot be discharged in time, it will cause an imbalance in the concentration of substances in the reaction system, inhibiting the continuation of the reaction. The design of the second diversion area 5 and the relevant cavity ports effectively solves this problem; and the second hydrogen cavity port 8, the second oxygen channel and the second coolant channel are each independent, which is convenient for the operator to separately check and analyze the output of different substances. Once an abnormality occurs, such as hydrogen leakage, abnormal coolant flow, etc., it can be quickly located and corresponding measures can be taken to reduce the risk of equipment failure, reduce maintenance costs and downtime, and improve the overall operation efficiency of the equipment.

[0033] Preferably, the first hydrogen cavity port 6, the first water-oxygen cavity port 7 and the first diversion area 4 are symmetrical with the second hydrogen cavity port 8, the second water-oxygen cavity port 9 and the second diversion area 5 about the center of the bipolar plate; that is, even after the bipolar plate is rotated 180° around its center, the left side structure of the flow field area 1 can overlap with the right side structure of the flow field area 1, thereby not affecting the upper and lower stacking assembly of the two bipolar plates, thereby improving the assembly efficiency.

[0034] Reference Figure 1 Preferably, a pair of first hydrogen cavity openings 6 are provided, and the pair of first hydrogen cavity openings 6 are provided on both sides of the first water-oxygen cavity opening 7, and a sealing ring 10 is provided around the first hydrogen cavity opening 6 and the first water-oxygen cavity opening 7; a pair of second hydrogen cavity openings 8 are provided, and the pair of second hydrogen cavity openings 8 are provided on both sides of the second water-oxygen cavity opening 9, and a sealing ring 10 is provided around the second hydrogen cavity opening 8 and the second water-oxygen cavity opening 9, and a sealing ring 10 is also provided around the edge of the bipolar plate.

[0035] In this way, a pair of first hydrogen cavity ports 6 are arranged on both sides of the first water-oxygen cavity port 7, and a pair of second hydrogen cavity ports 8 are arranged on both sides of the second water-oxygen cavity port 9. Such a layout design helps to more efficiently realize the transmission of hydrogen, oxygen and coolant. For hydrogen, the two hydrogen cavity ports work at the same time, which increases the input and output flux of hydrogen, can meet the demand for hydrogen flow in the process of electrolytic hydrogen production, ensure sufficient hydrogen supply to the flow field area 1 to participate in the reaction, and at the same time, discharge the hydrogen generated by the reaction in time to maintain the efficient progress of the reaction. The design of distribution on both sides can also make hydrogen enter and leave the flow field area 1 The hydrogen concentration in the gas chamber 1 is more evenly distributed, which avoids excessively high or low local hydrogen concentration, and improves the uniformity and stability of the reaction in the entire flow field area 1; the sealing ring 10 arranged around the first hydrogen chamber opening 6, the first water-oxygen chamber opening 7, the second hydrogen chamber opening 8, and the second water-oxygen chamber opening 9 can effectively fill the gaps between the chamber openings and the outside world or other components, prevent the leakage of hydrogen, oxygen and coolant, ensure that the gas and liquid flow in the specified channel, maintain the sealing and stability of the reaction system, not only improve the efficiency of hydrogen production by electrolysis, but also reduce the safety hazards caused by leakage, and extend the service life of the equipment.

[0036] In this embodiment, a guide structure is provided inside the first diversion area 4 and the second diversion area 5. The guide structure is adapted to the direct current channel 3 and is used to evenly distribute the electrolyte or reaction gas. The guide structure can be a guide groove or a guide protrusion.

[0037] With such a configuration, the flow path of the fluid is optimized by adapting the guide structure to the direct current channel 3. The guide structure can guide the fluid into the direct current channel 3 along a relatively smooth path, reduce the turbulence and collision of the fluid inside the diversion area, reduce the resistance of the fluid during transmission, and guide the electrolyte and reaction gas to be evenly dispersed when entering the flow field area 1. For example, when the electrolyte enters the first diversion area 4 and the second diversion area 5 from the first water-oxygen chamber port 7 or the second water-oxygen chamber port 9, the guide structure will guide it to the direct current channel 3 according to the preset path, ensuring that the electrolyte is evenly distributed in the direct current channel 3, so that the entire flow field area 1 can obtain sufficient electrolyte supply, improve the efficiency of the electrolysis reaction, and also reduce energy consumption.

[0038] like Figure 3 As shown, an embodiment of the present invention provides an electrolytic hydrogen production device, including: a bipolar plate and an MEA membrane electrode, the bipolar plate is the above-mentioned electrolytic hydrogen production bipolar plate; the MEA membrane electrode is arranged between a pair of bipolar plates, and one of the bipolar plates is assembled relative to and overlapped with the other bipolar plate by rotating 180°, so that the bottom of the direct current channel 3 of one bipolar plate corresponds to the top of the flow field groove ridge 2 of the other bipolar plate.

[0039] With such an arrangement, the electrolytic hydrogen production device adopts the above-mentioned electrolytic hydrogen production bipolar plates. Compared with the traditional wavy flow channels, the straight flow channels 3 make the flow of electrolyte between the plates smoother, without the need for frequent changes in flow direction, greatly reducing the flow field resistance, so that the electrolyte can quickly and efficiently reach the electrolysis reaction area, and the material transfer efficiency participating in the reaction is greatly improved; when the wavy flow channels of the traditional bipolar plates are stacked and assembled, it is easy for the ridges and grooves of the upper and lower flow channels to be inlaid with each other, causing damage to the MEA membrane electrode. In this device, the bipolar plates are assembled by rotating 180° relative to each other, which can reliably achieve the correspondence between the bottom of the straight flow channel 3 of one bipolar plate and the top of the flow field groove ridge 2 of the other bipolar plate, effectively avoiding the mutual inlay of the upper and lower flow channels, greatly reducing the risk of damage to the MEA membrane electrode, not only improving the service life of the MEA membrane electrode, but also ensuring the stability of the electrolyzer, and reducing equipment failures and maintenance costs caused by membrane electrode damage.

[0040] In addition, the direct current channel 3 design of the bipolar plate makes the plate stamping easier. Compared with the complex wavy flow channel, the shape of the direct current channel 3 is simple and regular, which reduces the difficulty and production cost of stamping die design and manufacturing, reduces stamping defects caused by complex flow channels, and improves product yield.

[0041] Furthermore, the electrolytic hydrogen production device also includes a shell, which is used to accommodate components such as bipolar plates, MEA membrane electrodes, and provide sealing and support. The electrolytic hydrogen production device is provided with inlets and outlets for electrolyte and reaction gas, and the positions and structures of the inlets and outlets correspond to the hydrogen cavity ports and water-oxygen cavity ports on the bipolar plates.

[0042] Furthermore, an insulating layer is provided between adjacent bipolar plates of the electrolytic hydrogen production device to prevent short circuits between the plates.

[0043] 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 various embodiments of the present invention.

Claims

1. A bipolar plate for hydrogen production by electrolysis, characterized in that: include: Flow field area (1); A plurality of flow field ridges (2) are provided in the flow field region (1) along a first direction, a groove between two adjacent flow field ridges (2) forms a direct current channel (3), the number of the direct current channels (3) is an odd number, and a center line of the bipolar plate along the first direction is located at the intersection of the flow field ridge (2) and the direct current channel (3), and the direct current channel (3) extends along a second direction, and the first direction is perpendicular to the second direction.

2. The bipolar plate for hydrogen production by electrolysis according to claim 1, characterized in that: The cross-sectional shape of the direct current channel (3) along the first direction is trapezoidal or arc-shaped.

3. The bipolar plate for hydrogen production by electrolysis according to claim 1, characterized in that: A first diversion area (4) and a second diversion area (5) are respectively provided at both ends of the flow field area (1); the first diversion area (4) and the second diversion area (5) are both connected to the flow field area (1) and are used for distributing and collecting reaction gas and cooling liquid respectively.

4. The bipolar plate for hydrogen production by electrolysis according to claim 3, characterized in that: The outer side of the first diversion area (4) is provided with: a first hydrogen cavity port (6), the first hydrogen cavity port (6) being connected to the flow field region (1) via a first diversion region (4) and being used for inputting hydrogen; The first water-oxygen chamber port (7) is used for inputting oxygen and cooling liquid, and comprises: a first oxygen channel, the first oxygen channel being in communication with the flow field region (1); A first coolant channel is integrated into the first flow dividing area (4).

5. The bipolar plate for hydrogen production by electrolysis according to claim 4, characterized in that: The outer side of the second diversion area (5) is provided with: a second hydrogen cavity port (8), the second hydrogen cavity port (8) being connected to the flow field region (1) via a second diversion region (5) and being used for outputting hydrogen; The second water-oxygen chamber port (9) is used for outputting oxygen and coolant, and includes: a second oxygen channel, the second oxygen channel being in communication with the flow field region (1); A second coolant channel is integrated into the second flow dividing area (5).

6. The bipolar plate for hydrogen production by electrolysis according to claim 4, characterized in that: A pair of the first hydrogen cavity openings (6) are provided, and the pair of the first hydrogen cavity openings (6) are provided on both sides of the first water-oxygen cavity opening (7). A sealing ring (10) is provided around the first hydrogen cavity opening (6) and the first water-oxygen cavity opening (7).

7. The bipolar plate for hydrogen production by electrolysis according to claim 5, characterized in that: A pair of the second hydrogen cavity openings (8) are provided, and the pair of the second hydrogen cavity openings (8) are provided on both sides of the second water-oxygen cavity opening (9), and a sealing ring (10) is provided around the second hydrogen cavity opening (8) and the second water-oxygen cavity opening (9).

8. The bipolar plate for hydrogen production by electrolysis according to claim 5, characterized in that: The first hydrogen cavity opening (6), the first water-oxygen cavity opening (7) and the first diversion region (4) are symmetrical with the second hydrogen cavity opening (8), the second water-oxygen cavity opening (9) and the second diversion region (5) about the center of the bipolar plate.

9. The bipolar plate for hydrogen production by electrolysis according to claim 3, characterized in that: A flow guiding structure is provided inside the first flow diversion area (4) and the second flow diversion area (5), and the flow guiding structure is adapted to the direct flow channel (3) and is used for uniformly distributing the electrolyte or the reaction gas.

10. An electrolytic hydrogen production device, characterized in that: include: The bipolar plate is the bipolar plate for hydrogen production by electrolysis according to any one of claims 1 to 9; The MEA membrane electrode is arranged between a pair of bipolar plates, and one of the bipolar plates is assembled relative to the other bipolar plate by rotating 180 degrees, so that the bottom of the direct current channel (3) of one bipolar plate corresponds to the top of the flow field groove ridge (2) of the other bipolar plate.

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