Bipolar plate and electrolytic bath

Abstract

The utility model relates to the technical field of electrolyzed water, in particular to a bipolar plate and an electrolytic bath. The utility model relates to a bipolar plate, which comprises a substrate, at least two side-by-side water oxygen flow fields arranged on the anode surface of the substrate, at least one hydrogen flow field arranged on the cathode surface of the substrate, and a water inlet, a water oxygen outlet and a hydrogen outlet which penetrate through the substrate, and the water inlet is communicated with the water inlet end part of each water oxygen flow field; the water oxygen outlet is communicated with the water oxygen outlet end part of each water oxygen flow field; and the hydrogen outlet is communicated with the hydrogen outlet end part of the hydrogen flow field. The utility model provides a bipolar plate and an electrolytic bath, which are used for solving the problem of non-uniform water flow distribution on the anode side of the bipolar plate.

Description

Technical Field

[0001] This utility model relates to the field of water electrolysis technology, specifically to bipolar plates and electrolytic cells. Background Technology

[0002] Proton exchange membrane electrolysis technology has high current density, low energy consumption, high hydrogen production pressure, small electrolyzer volume, flexible operation, and is conducive to rapid load changes, making it a suitable solution for hydrogen production by water electrolysis.

[0003] Proton exchange membrane water electrolyzers typically have two sets of end plates, upper and lower. These end plates are stacked together by multiple individual water electrolyzer cells connected in series. The upper and lower end plates are connected by screws to maintain the pressure within the stacked electrolyzers. The bipolar plate is a key component of the electrolyzer, primarily serving to transfer mass, conduct electricity, and provide structural support. The bipolar plate has an anode side and a cathode side, both with corresponding flow channels that significantly influence the two-phase flow and temperature distribution within the electrolyzer. The anode side of the bipolar plate, in particular, is crucial for the transport of liquid water and oxygen, requiring uniform water distribution and rapid removal of unreacted water and generated oxygen.

[0004] Therefore, how to make water evenly distributed on the anode side of the bipolar plate has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a bipolar plate and an electrolytic cell to solve the problem of uneven water flow distribution on the anode side of the bipolar plate.

[0006] In a first aspect, this utility model provides a bipolar plate, comprising:

[0007] The substrate includes at least two parallel water-oxygen flow fields disposed on the anode surface of the substrate, at least one hydrogen flow field disposed on the cathode surface of the substrate, and an inlet, an outlet for water and oxygen, and an outlet for hydrogen that penetrate the substrate.

[0008] The water inlet is connected to the water inlet end of each of the water-oxygen flow fields, and the water-oxygen outlet is connected to the water-oxygen outlet end of each of the water-oxygen flow fields.

[0009] The hydrogen outlet is connected to the hydrogen outlet end of the hydrogen flow field.

[0010] When using the same substrate, compared to setting up one water-oxygen flow field, setting up at least two water-oxygen flow fields on the anode surface will distribute too many anode flow channels in different water-oxygen flow fields, thereby reducing the number of anode flow channels in the same water-oxygen flow field, maintaining the uniformity of fluid flow within the bipolar plate, and improving the uniformity of gas-liquid distribution within the water-oxygen flow field.

[0011] In one optional embodiment, each of the water-oxygen flow fields has a plurality of parallel and serpentine anode channels. By setting at least two water-oxygen flow fields, each with a plurality of parallel anode channels, the number of turns in the anode channels can be effectively reduced, and the length of the anode channels can also be reduced, compared to the traditional method of setting a single water-oxygen flow field.

[0012] In one optional embodiment, an inlet guide channel is provided between the inlet end and the inlet of the water-oxygen flow field, an outlet guide channel is provided between the outlet oxygen end and the outlet oxygen port of the water-oxygen flow field, an inlet guide groove is provided between the inlet guide channel and the inlet end, and an outlet oxygen guide groove is provided between the outlet oxygen channel and the outlet oxygen end.

[0013] In one optional embodiment, each of the water-oxygen flow fields has a corresponding water inlet at its inlet end and a corresponding water-oxygen outlet at its outlet end, with the inlet and outlet positioned diagonally opposite each other.

[0014] In one optional embodiment, a first positioning part is provided between adjacent water inlets, and a second positioning part is provided between adjacent oxygen outlets. The first positioning part and the second positioning part are respectively provided with positioning holes. Positioning rods are inserted through the positioning holes of the first positioning part and the positioning holes of the second positioning part to realize the side-by-side arrangement of multiple bipolar plates.

[0015] In one optional embodiment, the hydrogen flow field has several parallel and serpentine cathode channels, and each end of the hydrogen flow field is provided with a hydrogen outlet end. A hydrogen outlet guide channel is provided between the hydrogen outlet end and the hydrogen outlet, and a hydrogen outlet guide groove is provided between the hydrogen outlet guide channel and the hydrogen outlet end.

[0016] In one alternative embodiment, the width of the hydrogen outlet channel toward the hydrogen outlet end is greater than the width toward the hydrogen outlet port.

[0017] In one alternative embodiment, a first sealing groove is provided around the water-oxygen flow field on the anode surface, and a second sealing groove is provided around the channel; on the cathode surface, a third sealing groove is provided around the hydrogen flow field, and a fourth sealing groove is provided around the channel.

[0018] In one optional embodiment, a patrol terminal is provided at each of the four corners of the substrate.

[0019] Secondly, this utility model also provides an electrolytic cell, comprising at least two of the aforementioned bipolar plates. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a front view of the anode surface of a bipolar plate according to an embodiment of the present utility model;

[0022] Figure 2 This is a front view of the cathode surface of a bipolar plate according to an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional view of a bipolar plate according to an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of one corner of a bipolar plate according to an embodiment of the present invention;

[0025] Figure 5 This is a longitudinal sectional view of a bipolar plate according to an embodiment of the present utility model;

[0026] Figure 6 for Figure 5 An enlarged schematic diagram of part A.

[0027] Explanation of reference numerals in the attached drawings: 1. Water inlet; 2. Oxygen outlet; 3. Hydrogen outlet; 4. Water-oxygen flow field; 401. Anode flow channel; 5. Hydrogen flow field; 501. Cathode flow channel; 6. Water inlet guide channel; 7. Oxygen outlet guide channel; 8. Hydrogen outlet guide channel; 9. Second sealing groove; 10. Fourth sealing groove; 11. First positioning part; 12. Inspection terminal; 13. Water inlet guide channel; 14. Oxygen outlet guide channel; 15. Hydrogen outlet guide channel; 16. First groove; 17. Second groove; 18. Substrate; 19. Anode diffusion layer; 20. Cathode diffusion layer; 21. Second positioning part; 2101. Positioning hole; 22. Anode surface; 23. Cathode surface. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0030] According to an embodiment of the present invention, a bipolar plate is provided, comprising: a substrate 18, two parallel water-oxygen flow fields 4 disposed on the anode surface 22 of the substrate 18, a hydrogen flow field 5 disposed on the cathode surface 23 of the substrate 18, and an inlet 1, an outlet 2, and a hydrogen outlet 3 disposed through the substrate 18; the inlet 1 is connected to the inlet end of each water-oxygen flow field 4, the outlet 2 is connected to the outlet end of each water-oxygen flow field 4, and the hydrogen outlet 3 is connected to the outlet end of the hydrogen flow field 5.

[0031] When using the same substrate 18, compared to setting one water-oxygen flow field 4, setting at least two water-oxygen flow fields 4 will distribute too many anode channels 401 in different water-oxygen flow fields 4, thereby reducing the number of anode channels 401 in the same water-oxygen flow field 4, maintaining the uniformity of fluid flow in the bipolar plate, and improving the uniformity of gas-liquid distribution in the water-oxygen flow field 4.

[0032] like Figure 1 As shown, in one embodiment, each water-oxygen flow field 4 is provided with several parallel and serpentine anode channels 401. By setting two water-oxygen flow fields 4, each with several parallel anode channels 401, when the substrate 18 has the same size, compared with the traditional case of setting one water-oxygen flow field 4, the number of turns of the anode channels 401 can be effectively reduced, the length of the anode channels 401 can be reduced, and the uniformity of gas-liquid distribution within the water-oxygen flow field 4 can also be improved.

[0033] like Figure 1 , Figure 3 and Figure 4 As shown, in one embodiment, an inlet guide channel 13 is provided between the inlet end of the water-oxygen flow field 4 and the inlet 1, an outlet oxygen guide channel 14 is provided between the outlet oxygen end of the water-oxygen flow field 4 and the outlet oxygen 2, an inlet guide groove 6 is provided between the inlet guide channel 13 and the inlet end, and an outlet oxygen guide groove 7 is provided between the outlet oxygen channel and the outlet oxygen end.

[0034] In this embodiment, water enters through inlet 1, and the liquid water flows through inlet guide channel 13 into inlet guide trough 6. Inlet guide trough 6 evenly distributes the water flow into each anode channel 401 of the water-oxygen flow field 4. Oxygen and water flowing out from the outlet oxygen end first gather in outlet oxygen guide trough 7, and then flow from outlet oxygen guide trough 7 through outlet oxygen guide channel 14 to outlet oxygen port 2.

[0035] like Figure 1 , Figure 3 and Figure 4As shown, each water-oxygen flow field 4 has a corresponding inlet 1 at its inlet end and a corresponding outlet 2 at its outlet end. The inlet 1 and outlet 2 are arranged diagonally.

[0036] In this embodiment, the inlet 1 is set to correspond with the inlet port, so that the liquid water entering through the inlet 1 can smoothly enter the inlet end and then flow into the anode channel 401 from the inlet end; the outlet oxygen port 2 is set to correspond with the outlet oxygen end, so that the generated oxygen and the unreacted water can flow out of the anode channel 401 through the outlet oxygen end and then flow into the outlet oxygen port 2 from the outlet oxygen end.

[0037] It is important to note that, such as Figure 1 As shown, there are two inlets 1 and two inlet guide channels 6. That is, the inlets 1 and the water-oxygen flow fields 4 are set in a one-to-one correspondence, and the inlets 1 and the inlet guide channels 6 are set in a one-to-one correspondence. The two inlets 1 are set on the same side of the substrate 18, so as to achieve the effect of simultaneously supplying water to the two water-oxygen flow fields 4 on the same side of the substrate 18, so that water can flow evenly into each anode channel 401 in the two water-oxygen flow fields 4.

[0038] In this embodiment, it should be noted that there are two oxygen outlets 2 and two oxygen guide channels 7. That is, the oxygen outlets 2 and the oxygen flow field 4 are arranged in a one-to-one correspondence, and the oxygen outlets 2 and the oxygen guide channels 7 are arranged in a one-to-one correspondence. The two oxygen outlets 2 are arranged on the same side of the substrate 18, and the oxygen outlets 2 and the water inlet 1 are located on opposite sides of the substrate 18, so as to achieve the effect that the produced oxygen flows out from the same side of the substrate 18, which facilitates oxygen collection. Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, both the water inlet 1 and the oxygen outlet 2 are through holes that penetrate the substrate 18.

[0039] In this embodiment, the water inlet end and the oxygen outlet end are arranged diagonally to facilitate the setting of the positions of the water inlet 1 and the oxygen outlet 2 of the substrate 18.

[0040] In this embodiment, adjacent anode channels 401 are spaced apart, and each anode channel 401 has the same size to ensure that each anode channel 401 has the same working environment. This ensures that water and oxygen have a consistent and low pressure drop along the extension direction within each anode channel 401, making the fluid flow smoother and ensuring the overall uniformity of the fluid within the water-oxygen flow field 4. This prevents the phenomenon of excessively large or small local currents caused by uneven gas-liquid distribution. The width of the anode channel 401 ranges from 0.5 to 2 mm, the depth ranges from 0.5 to 2 mm, and the spacing between adjacent channels is 0.5 to 2 mm.

[0041] like Figure 1 , Figure 2 , Figure 3 As shown, in one embodiment, a first positioning part 11 is provided between adjacent water inlets 1, and a second positioning part 21 is provided between adjacent water outlets 2. The first positioning part 11 and the second positioning part 21 are respectively provided with positioning holes 2101, which penetrate the substrate 18. The positioning holes 2101 of the first positioning part 11 and the positioning holes 2101 of the second positioning part 21 are respectively inserted into positioning rods to realize the stacking arrangement of multiple bipolar plates, which facilitates the alignment between the bipolar plates to be stacked and improves the positioning accuracy and efficiency of assembly.

[0042] like Figure 1 , Figure 4 As shown, in one embodiment, the anode surface 22 has a first sealing groove surrounding the water-oxygen flow field 4, and the anode surface 22 has a second sealing groove 9 surrounding the channel, which refers to a channel in the form of a water inlet 1, a water-oxygen outlet 2, and a hydrogen outlet 3. The anode surface 22 has a first groove 16, and the water-oxygen flow field 4 is located in the first groove 16 (that is, the water-oxygen flow field 4 is formed in the first groove 16 after processing). The second sealing groove 9 is formed around the water inlet 1, the water-oxygen outlet 2, the first positioning part 11, and the second positioning part 21, respectively. The first sealing groove and the second sealing groove 9 form the anode sealing groove 9, which is used to place the anode sealing ring. The elastic and plastic deformation generated by the anode sealing ring itself fills the space of the anode sealing groove, thereby achieving the purpose of sealing.

[0043] It is important to note that, such as Figure 4 As shown, the water inlet 1 is a through hole penetrating the substrate 18. The water inlet guide channel 6 is formed between the inner wall of the first groove 16 and the water inlet end, and the bottom surface of the water inlet guide channel 6 is at the same height as the bottom surface of the anode flow channel 401. In addition, the water outlet oxygen port 2 is a through hole penetrating the substrate 18. The water outlet oxygen guide channel 7 is formed between the inner wall of the first groove 16 and the water outlet oxygen end, and the bottom surface of the water outlet oxygen guide channel 7 is at the same height as the bottom surface of the anode flow channel 401.

[0044] like Figure 5 , Figure 6 As shown, in this embodiment, an anode diffusion layer 19 is also included. The anode diffusion layer 19 partially extends into the first groove 16, and the thickness of the anode diffusion layer 19 is 0.3-0.5 mm. Figure 6 As shown, the anode flow channel 401 has a "U" shaped cross-section and an opening. An anode diffusion layer 19 covers the opening, which allows liquid water and oxygen to pass through.

[0045] like Figure 2 , Figure 3 and Figure 6As shown, in one embodiment, the hydrogen flow field 5 has several parallel and serpentine cathode channels 501. Each end of the hydrogen flow field 5 has a hydrogen outlet end, which are diagonally arranged so that hydrogen can flow out from both ends of each cathode channel 501. A hydrogen outlet guide channel 15 is provided between the hydrogen outlet end and the hydrogen outlet port 3, and a hydrogen outlet guide groove 8 is provided between the hydrogen outlet guide channel 15 and the hydrogen outlet end. The hydrogen flowing out from each hydrogen outlet end collects in the hydrogen outlet guide groove 8, passes through the hydrogen outlet guide channel 15, and finally flows out through the hydrogen outlet port 3. It should be noted that the hydrogen outlet port 3 is a through-hole penetrating the substrate 18, and the hydrogen outlet guide groove 8 and the hydrogen outlet port 3 are arranged in a one-to-one correspondence.

[0046] like Figure 2 As shown, the cathode surface 23 is provided with a second groove 17, and a hydrogen flow field 5 is provided in the second groove 17 (that is, the hydrogen flow field 5 is formed in the second groove 17 after processing). A hydrogen outlet guide groove 8 is formed between the inner sidewall of the second groove 17 and the hydrogen outlet end. The bottom surface of the hydrogen outlet guide groove 8 is set at the same height as the bottom surface of the cathode flow channel 501. The width of the cathode flow channel 501 is 0.5-2mm, the depth is 0.5-2mm, and the spacing between adjacent flow channels is 0.5-2mm.

[0047] like Figure 3 As shown, in one embodiment, the width of the hydrogen outlet channel 15 facing the hydrogen outlet end is greater than the width facing the hydrogen outlet 3. That is, a portion of the hydrogen outlet channel 15 is arranged obliquely, forming a trapezoid (the upper base of the trapezoid is the length of the hydrogen outlet 3, the lower base is the length of the hydrogen outlet channel 8, and the waistline is the hydrogen outlet channel 15). In this application, a right-angled trapezoid is preferred. With the above arrangement, on the one hand, the length of the hydrogen outlet channel 8 can be longer to accommodate more cathode channels 501 and to obtain more hydrogen at the hydrogen outlet end. On the other hand, the hydrogen outlet 3 meets the size requirements of the substrate 18, eliminating the need to lengthen the substrate 18 and making the overall structure of the substrate 18 more compact.

[0048] In this embodiment, the end face of the cathode channel 501 of the hydrogen flow field 5 is lower than the end face of the second groove 17. For example... Figure 6 As shown, the cross-section of the cathode flow channel 501 is U-shaped and has an opening. The opening is covered by a cathode diffusion layer 20, which extends into the second groove 17. The cathode diffusion layer 20 allows hydrogen to pass through, and the thickness of the cathode diffusion layer 20 is 0.3-0.5 mm.

[0049] like Figure 2As shown, in one embodiment, the cathode surface 23 has a third sealing groove surrounding the hydrogen flow field 5, and a fourth sealing groove 10 surrounding the channel, which refers to a channel in the form of a water inlet 1, a water oxygen outlet 2, and a hydrogen outlet 3. The cathode surface 23 has a second groove 17, and the hydrogen flow field 5 is located in the second groove 17 (i.e., the hydrogen flow field 5 is formed in the second groove 17 after processing). The fourth sealing groove 10 is formed around the water inlet 1, the water oxygen outlet 2, the first positioning part 11, and the second positioning part 21, respectively. The third sealing groove and the fourth sealing groove 10 form the cathode sealing groove. It should be noted that the bottom surface of the cathode sealing groove is lower than the end face of the substrate 18. The cathode sealing groove is suitable for installing a cathode sealing ring. The elasticity and plastic deformation generated by the cathode sealing ring itself fills the space of the cathode sealing groove, achieving the purpose of sealing. It should be noted that the horizontal projection of the anode sealing groove coincides with the horizontal projection of the cathode sealing groove. The depth of the anode sealing groove or the cathode sealing groove is 0.4-1mm, and the width of the anode sealing groove or the cathode sealing groove is 1-10mm.

[0050] like Figure 1 , Figure 2 As shown, in one embodiment, a test terminal 12 is provided at each of the four corners of the substrate 18, and each test terminal 12 has a through hole. The test terminal 12 is used to connect external components, such as voltage testing components, to test the operating performance of each electrolysis unit and to detect electrolytic cell faults. It should be noted that the test terminal 12 can be integrally formed with the bipolar plate and extend outward from the plate body, or it can be formed separately and soldered to the plate body.

[0051] It should be noted that the bipolar plate in this embodiment is made of titanium or stainless steel, and the surface of the substrate 18 is coated to prevent corrosion during the electrochemical reaction. The coating material can be gold, platinum or other composite materials.

[0052] According to an embodiment of this utility model, another aspect provides an electrolytic cell comprising several bipolar plates as described above, and several proton exchange membranes, wherein the number of proton exchange membranes is one less than the number of bipolar plates. In actual assembly, the surface of the anode diffusion layer 19 of one bipolar plate is attached to one side of the proton exchange membrane, and the other side of the proton exchange membrane is attached to the surface of the cathode diffusion layer 20 of another bipolar plate, thereby forming a stacked structure of several bipolar plates.

[0053] In the specific implementation process, liquid water flows into the two inlets 1 of a substrate 18, and then into the inlet guide channel 6 through the inlet guide channel 13. From the inlet guide channel 6, the water flows evenly into each anode channel 401. During electrolysis, the water in the anode channel 401 permeates into the anode diffusion layer 19. Under the capillary pressure of the porous anode diffusion layer 19, the liquid water diffuses to the surface of the anode catalyst layer of the proton exchange membrane and decomposes into oxygen, hydrogen ions, and electrons under the action of the anode catalyst. The oxygen then passes through the anode diffusion layer 19. The water enters the anode channel 401 of the water-oxygen flow field 4 in the form of bubbles, and flows out along with the water in the anode channel 401 through the water-oxygen port, the water-oxygen outlet guide channel 14, and the water-oxygen outlet 2. At the same time, hydrogen ions pass through the proton exchange membrane and enter the cathode diffusion layer 20 under the action of the electric field force. The hydrogen ions then combine with the electrons transmitted by the external circuit on the surface of the cathode catalyst layer of the cathode diffusion layer 20 to generate hydrogen gas. The hydrogen gas enters the cathode channel 501 of the hydrogen flow field 5 and flows out through the hydrogen outlet port, the hydrogen outlet guide channel 15, and the hydrogen outlet 3.

[0054] The bipolar plate provided by this utility model has the following advantages: (1) It sets at least two water-oxygen flow fields 4, which reduces the number of turns in the anode flow channel 401, effectively reduces the pressure loss in the anode flow channel 401, and maintains the uniformity of the fluid in the bipolar plate; (2) Each anode flow channel 401 has the same size, so as to ensure that each anode flow channel 401 has the same working environment, and ensures that water and oxygen have a consistent and low pressure drop along the extension direction in each anode flow channel 401, so that the fluid flow is smoother; (3) The water inlet 1 on the same side, the water-oxygen outlet 2 on the same side, the water inlet 1 and the water-oxygen outlet 2 are arranged diagonally, and the hydrogen outlet 3 is arranged diagonally, so that the structure of the entire substrate 18 is more compact, and the size of the bipolar plate is reduced while ensuring the reaction efficiency.

[0055] As an alternative implementation, the number of water-oxygen flow fields 4 can also be three, four, or other quantities.

[0056] As an alternative implementation, the number of hydrogen flow fields 5 can also be two, three, four, or other quantities.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A bipolar plate, characterized in that, include: The substrate (18) includes at least two parallel water-oxygen flow fields (4) disposed on the anode surface (22) of the substrate (18), at least one hydrogen flow field (5) disposed on the cathode surface (23) of the substrate (18), and an inlet (1), an outlet (2), and an outlet (3) disposed through the substrate (18). The inlet (1) is connected to the inlet end of each of the water-oxygen flow fields, and the outlet (2) is connected to the outlet end of each of the water-oxygen flow fields (4). The hydrogen outlet (3) is connected to the hydrogen outlet end of the hydrogen flow field (5).

2. The bipolar plate according to claim 1, characterized in that, Each of the water-oxygen flow fields (4) is provided with several parallel and serpentine anode flow channels (401).

3. The bipolar plate according to claim 2, characterized in that, An inlet guide channel (13) is provided between the inlet end and the inlet (1) of the water-oxygen flow field (4), an outlet oxygen guide channel (14) is provided between the outlet oxygen end and the outlet oxygen port (2) of the water-oxygen flow field (4), an inlet guide groove (6) is provided between the inlet guide channel (13) and the inlet end, and an outlet oxygen guide groove (7) is provided between the outlet oxygen guide channel (14) and the outlet oxygen end.

4. The bipolar plate according to claim 3, characterized in that, Each water-oxygen flow field (4) has a corresponding water inlet (1) at its inlet end and a corresponding water outlet (2) at its outlet end. The water inlet (1) and the water outlet (2) are arranged diagonally.

5. The bipolar plate according to claim 4, characterized in that, A first positioning part (11) is provided between adjacent water inlets (1), and a second positioning part (21) is provided between adjacent water outlets (2). The first positioning part (11) and the second positioning part (21) are respectively provided with positioning holes (2101).

6. The bipolar plate according to any one of claims 1-5, characterized in that, The hydrogen flow field (5) is provided with several parallel and serpentine cathode channels (501). Each end of the hydrogen flow field (5) is provided with a hydrogen outlet end. A hydrogen outlet guide channel (15) is provided between the hydrogen outlet end and the hydrogen outlet (3). A hydrogen outlet guide groove (8) is provided between the hydrogen outlet guide channel (15) and the hydrogen outlet end.

7. The bipolar plate according to claim 6, characterized in that, The width of the hydrogen outlet channel (15) facing the hydrogen outlet end is greater than the width facing the hydrogen outlet (3).

8. The bipolar plate according to claim 1, characterized in that, On the anode surface (22), a first sealing groove is provided around the water-oxygen flow field (4), and a second sealing groove (9) is provided around the channel. On the cathode surface (23), a third sealing groove is provided around the hydrogen flow field (5), and a fourth sealing groove (10) is provided around the channel.

9. The bipolar plate according to claim 8, characterized in that, The substrate (18) is provided with an inspection terminal (12) at each of its four corners.

10. An electrolytic cell, characterized in that, It includes at least two bipolar plates as described in any one of claims 1-9.

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