Sealed bipolar plate of proton exchange membrane electrolytic cell

Abstract

The utility model discloses a sealing bipolar plate of a proton exchange membrane electrolytic cell, which belongs to the technical field of hydrogen production by water electrolysis and comprises a bipolar plate body, a water inlet, a water / oxygen outlet, a first hydrogen outlet, a second hydrogen outlet, a water / oxygen flow field area, a hydrogen flow field area, an anode closed sealing groove and an anode sealing ring, the first hydrogen outlet, the water / oxygen outlet, the second hydrogen outlet and the water inlet are positioned at the edge of the bipolar plate body and are through holes; the first hydrogen outlet and the second hydrogen outlet are diagonally arranged; the water inlet and the water / oxygen outlet are diagonally arranged; a water / oxygen flow field area is arranged on the anode surface of the bipolar plate body; a hydrogen flow field area is arranged on the cathode surface of the bipolar plate body; the anode closed sealing groove is formed in the anode surface of the bipolar plate body; and an anode sealing ring is arranged in the anode closed sealing groove. According to the utility model, the water / oxygen flow field area and the hydrogen flow field area are optimally designed, so that the water flow can be more uniformly distributed, and the gas flow is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electrolytic water hydrogen production technical field, especially relates to a proton exchange membrane electrolytic tank sealing bipolar plate. BACKGROUND

[0002] PEM (Proton Exchange Membrane) water electrolysis hydrogen production is one of the main technical routes for producing green hydrogen. Compared with alkaline water electrolysis hydrogen production technology, PEM water electrolysis hydrogen production technology has the advantages of high current density, high hydrogen purity, fast response speed, etc. As the core equipment, PEM electrolytic tank must withstand high pressure, high temperature and strong oxidation environment. As a key component of the electrolytic tank, the bipolar plate bears multiple tasks such as supporting the diffusion layer, conducting electricity, conducting heat, and transmitting gas and water. The realization of all these functions depends on a good sealing environment to ensure long-term stable operation.

[0003] The bipolar plate, as the "skeleton" of the electrolytic tank, plays an important role in the electrolysis process. However, the existing PEM electrolytic tank bipolar plate design has some shortcomings, especially in terms of sealing performance. Common problems include internal hydrogen and oxygen gas mixing, hydrogen leakage outside, etc., which can affect the safety and efficiency of the electrolytic tank. In addition, under high assembly pressure, the sealing ring at the intersection of the sealing groove is easily extruded and damaged due to stress concentration in these areas. This stress concentration phenomenon can cause the sealing ring to deform, resulting in uneven contact resistance between the membrane electrode assembly and the bipolar plate, which can affect the electrolysis efficiency and cause displacement of the membrane electrode assembly. The diagonal flow field area often appears dry or accumulates hydrogen, forming a dead zone. The uneven distribution of water / oxygen two-phase flow and hydrogen flow in the flow field area can cause local high temperature and increased contact resistance in the bipolar plate, reducing the service life and electrolysis efficiency of the bipolar plate. SUMMARY

[0004] To solve the above problems, the utility model discloses a proton exchange membrane electrolytic tank sealing bipolar plate, which comprises: a bipolar plate body, a water inlet, a water / oxygen outlet, a first hydrogen outlet, a second hydrogen outlet, a water / oxygen flow field area, a hydrogen flow field area, an anode closed sealing groove and an anode sealing ring.

[0005] The first hydrogen outlet, the water / oxygen outlet, the second hydrogen outlet and the water inlet are located at the edge of the bipolar plate body and are all through holes; the first hydrogen outlet and the second hydrogen outlet are diagonally arranged; the water inlet and the water / oxygen outlet are diagonally arranged;

[0006] The anode face of the bipolar plate body is provided with a water / oxygen flow field area;

[0007] The cathode face of the bipolar plate body is provided with a hydrogen flow field area;

[0008] The anode closed sealing groove is arranged on the anode face of the bipolar plate body;

[0009] The first hydrogen outlet and the second hydrogen outlet are provided with an anode closed sealing groove outside;

[0010] The water inlet, the water / oxygen flow field area and the water / oxygen outlet are provided with an anode closed sealing groove outside;

[0011] The anode closed sealing groove is provided with an anode sealing ring inside.

[0012] Further, it also includes a water inlet flow guide groove and a water / oxygen outlet flow guide groove;

[0013] The water inlet and the water / oxygen flow field area are provided with a plurality of water inlet flow guide grooves;

[0014] The water / oxygen outlet and the water / oxygen flow field area are provided with a plurality of water / oxygen outlet flow guide grooves.

[0015] Further, the water / oxygen flow field area includes a water / oxygen main flow field and a water / oxygen auxiliary flow field;

[0016] The water / oxygen flow field area is in the shape of a rectangle as a whole;

[0017] The water / oxygen main flow field is provided with a water / oxygen auxiliary flow field above and below respectively;

[0018] The water / oxygen main flow field is in the shape of a parallelogram as a whole;

[0019] The water / oxygen auxiliary flow field is in the shape of a right-angled triangle as a whole.

[0020] Further, the water / oxygen main flow field includes a plurality of longitudinal flow guide grooves;

[0021] The width of the longitudinal flow guide groove ranges from 0.5mm to 5mm;

[0022] The spacing between the longitudinal flow guide grooves ranges from 0.5mm to 5mm;

[0023] The ratio of the total width of the longitudinal flow guide grooves to the width of the water / oxygen flow field area ranges from 1:1.3 to 2.

[0024] Further, the water / oxygen auxiliary flow field includes a plurality of cylindrical columns arranged in a dot matrix;

[0025] The angle between the long right-angled side and the oblique side of the water / oxygen auxiliary flow field ranges from 10° to 30°.

[0026] Further, the depth of the hydrogen flow field area, the water / oxygen flow field area, the water inlet flow guide groove and the water / oxygen outlet flow guide groove ranges from 0.05mm to 2mm.

[0027] Further, it also includes a cathode closed sealing groove and a cathode sealing ring;

[0028] The cathode closed sealing groove is arranged on the cathode surface;

[0029] The one side of the cathode sealing ring away from the bipolar plate body is provided with a plurality of strip-shaped protrusions;

[0030] The water inlet and the water / oxygen outlet are both provided with the cathode closed sealing groove;

[0031] The first hydrogen outlet, the second hydrogen outlet and the hydrogen flow field area are all provided with the cathode closed sealing groove;

[0032] The cathode closed sealing groove is provided with the cathode sealing ring.

[0033] Further, the cross section of the anode sealing ring and the cathode sealing ring is rectangular, the compression rate is 8-30%, and the filling rate of the closed sealing groove is 60-90%.

[0034] Further, the cross section of the anode closed sealing groove and the cathode closed sealing groove is rectangular, the depth is 0.1-1mm, and the width is 1-10mm.

[0035] Further, the fastener hole and the positioning hole are further included;

[0036] The fastener holes are arranged on the four peripheral edges of the bipolar plate body;

[0037] The positioning holes are arranged at the four corners of the bipolar plate body.

[0038] Compared with the prior art, the embodiment of the utility model has at least the following advantages:

[0039] 1) The three closed sealing grooves on one side become three independent sealing areas, and there are two sealing rings between the adjacent three sealing areas, which effectively avoids the potential leakage and gas mixing risk caused by the intersection point of the sealing groove in the traditional sealing structure, especially the safety hidden danger caused by the mixing of hydrogen and oxygen;

[0040] 2) The three closed sealing grooves on one side constitute independent sealing areas, and there is no intersection point between them, which effectively avoids the use of the traditional T-shaped lap sealing ring; this structure avoids the damage of the traditional sealing ring under high assembly pressure due to stress concentration, thereby preventing the uneven contact resistance between the membrane electrode assembly and the bipolar plate, prolonging the service life of the sealing element and the bipolar plate; by ensuring that the sealing ring is uniformly pressed, the utility model not only realizes the consistency of the contact resistance, but also improves the electrolysis efficiency while maintaining high sealing performance;

[0041] 3) One side of the cathode sealing ring is provided with strip-shaped protrusions, which are arranged alternately in peak and valley shapes, and the peak and valley shapes of the protrusions help to form a more compact and irregular wavy sealing contact surface when assembled under pressure, effectively reducing the risk of gas leakage through the sealing surface between the sealing ring and the membrane electrode frame membrane, thereby further improving the sealing reliability of the electrolytic cell;

[0042] 4) Fastener holes are arranged between the first hydrogen outlet and the water / oxygen outlet, and between the water inlet and the second hydrogen outlet, and the electrolytic cell is fastened by bolts, thereby ensuring the sealing effect between the ports and effectively preventing gas and liquid leakage. In addition, by adding positioning holes and combining the fastening effect of the bolts, the assembly efficiency and sealing performance of the electrolytic cell are significantly improved;

[0043] 5) The bipolar plate is designed in a perfect central symmetry structure, and the anode surface and the cathode surface are completely consistent in structure, eliminating the need to distinguish between the front and back surfaces during assembly, thereby simplifying the assembly process. This symmetry not only improves the convenience of assembly, but also reduces the complexity of the machining process, thereby reducing production costs and facilitating mass production of bipolar plates; through this design, the universality and production efficiency of the electrolytic cell assembly are improved while maintaining cost-effectiveness;

[0044] 6) The water / oxygen flow field area and the hydrogen flow field area are optimally designed, which can more evenly distribute the water flow, effectively avoid local high temperature phenomenon, and enhance the gas flow, reduce the dead zone, thereby ensuring the uniform distribution of water / oxygen two-phase flow and hydrogen flow in the flow field area, thereby improving the service life and electrolysis efficiency of the bipolar plate.

[0045] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned from practice of the application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0047] Figure 1 The bipolar plate anode surface structure according to the embodiment of the present application is shown in the schematic diagram;

[0048] Figure 2A bipolar plate cathode surface structure schematic diagram according to an embodiment of the present application is shown.

[0049] Figure 3 A bipolar plate closed sealing groove and sealing ring combination schematic diagram according to an embodiment of the present application is shown.

[0050] Figure 4 A sealing ring structure schematic diagram before and after pressing according to an embodiment of the present application is shown.

[0051] Figure 5 A positive and negative electrode sealing ring superposition schematic diagram according to an embodiment of the present application is shown.

[0052] Reference signs: 1, bipolar plate body; 2, water inlet; 3, water / oxygen outlet; 4, first hydrogen outlet; 5, fastener hole; 6, positioning hole; 7, primer; 8, membrane electrode frame membrane; 9, second hydrogen outlet;

[0053] 11, anode surface; 12, water inlet flow guide groove; 13, water / oxygen outlet flow guide groove; 14, water / oxygen flow field area; 141, water / oxygen main flow field; 142, water / oxygen auxiliary flow field; 15, anode closed sealing groove; 16, anode sealing ring;

[0054] 21, cathode surface; 22, cathode closed sealing groove; 23, cathode sealing ring; 231, strip-shaped protrusion; 24, hydrogen flow field area. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0056] Figure 1 A bipolar plate anode surface structure schematic diagram according to an embodiment of the present application is shown. As shown in the figure, Figure 1 The present application proposes a proton exchange membrane electrolytic cell sealing bipolar plate, which comprises: a bipolar plate body 1, a water inlet 2, a water / oxygen outlet 3, a first hydrogen outlet 4, a second hydrogen outlet 9, a water / oxygen flow field area 14, a hydrogen flow field area 24, an anode closed sealing groove 15 and an anode sealing ring 16.

[0057] The bipolar plate body 1 is arranged in a flat cuboid shape, and the two end faces thereof are an anode surface 11 and a cathode surface 21 respectively.

[0058] The first hydrogen outlet 4, the water / oxygen outlet 3, the second hydrogen outlet 9 and the water inlet 2 are located at the edge of the bipolar plate body 1; and are all through holes; the first hydrogen outlet 4 and the second hydrogen outlet 9 are diagonally arranged, wherein the second hydrogen outlet 9 is adjacent to the water inlet 2, and the first hydrogen outlet 4 is adjacent to the water / oxygen outlet 3; the water inlet 2 and the water / oxygen outlet 3 are diagonally arranged to realize effective utilization of space and optimization of flow.

[0059] For example, the first hydrogen outlet 4 is located at the upper left corner of the bipolar plate body 1; the water / oxygen outlet 3 is located at the upper right corner of the bipolar plate body 1; the second hydrogen outlet 9 is located at the lower right corner of the bipolar plate body 1; and the water inlet 2 is located at the lower left corner of the bipolar plate body 1.

[0060] The water inlet 2, the water / oxygen outlet 3, the first hydrogen outlet 4 and the second hydrogen outlet 9 are all holes penetrating through the bipolar plate body 1, and are preferably rectangular structures.

[0061] The anode face 11 is provided with the water inlet 2, the water / oxygen flow field area 14, the water / oxygen outlet 3, the first hydrogen outlet 4, the second hydrogen outlet 9 and the anode closed sealing groove 15 arranged around each peripheral area. The water inlet 2, the water / oxygen flow field area 14 and the water / oxygen outlet 3 are arranged around one anode closed sealing groove 15, and the two hydrogen outlets are arranged around two anode closed sealing grooves 15, totaling three independent closed sealing grooves without any junction point. The anode closed sealing groove 15 is arranged on the anode face 11. The anode closed sealing groove 15 is provided with an anode sealing ring 16.

[0062] The proton exchange membrane electrolyzer sealing bipolar plate further comprises a water inlet flow guide groove 12 and a water / oxygen outlet flow guide groove 13.

[0063] The water inlet 2 is connected to the water / oxygen flow field area 14 through the water inlet flow guide groove 12, and the water / oxygen outlet 3 is connected to the water / oxygen flow field area 14 through the water / oxygen outlet flow guide groove 13.

[0064] The cathode face 21 is provided with the first hydrogen outlet 4, the hydrogen flow field area 24, the second hydrogen outlet 9, the water inlet 2, the water / oxygen outlet 3 and the cathode closed sealing groove 22 arranged around each peripheral area. The cathode closed sealing groove 22 is arranged on the cathode face 21. The two hydrogen outlets are respectively connected to the hydrogen flow field area 24.

[0065] One cathode closed sealing groove 22 is arranged around the water inlet 2 and the water / oxygen outlet 3;

[0066] One cathode closed sealing groove 22 is arranged around the first hydrogen outlet 4, the second hydrogen outlet 9 and the hydrogen flow field area 24;

[0067] The cathode sealing ring 23 is arranged in the cathode closed sealing groove 22.

[0068] After the bipolar plate is used, two grooves are arranged between each independent closed sealing groove for placing the sealing ring, and the structure can effectively prevent hydrogen and oxygen from penetrating each other in the case of poor sealing, thereby reducing the risk of gas mixing explosion.

[0069] As shown in Figure 1 and Figure 2 The water / oxygen flow field area 14 is composed of a water / oxygen main flow field 141 and two water / oxygen auxiliary flow fields 142.

[0070] The water / oxygen flow field area 14 is in the shape of a rectangle as a whole;

[0071] The water / oxygen main flow field 141 is provided with a water / oxygen auxiliary flow field 142 above and below, respectively;

[0072] The water / oxygen main flow field 141 is in the shape of a parallelogram as a whole;

[0073] The water / oxygen auxiliary flow field 142 is in the shape of a right-angled triangle as a whole.

[0074] The water / oxygen main flow field 141 comprises a plurality of longitudinal flow guide grooves;

[0075] The width of the longitudinal flow guide groove ranges from 0.5mm to 5mm; for example, the width of the longitudinal flow guide groove is 2mm;

[0076] The spacing between the longitudinal flow guide grooves ranges from 0.5mm to 5mm; for example, the spacing between the longitudinal flow guide grooves is 2mm;

[0077] The ratio of the total width of the longitudinal flow guide grooves to the width of the water / oxygen flow field area 14 ranges from 1:1.3 to 2; for example, the ratio of the total width of the longitudinal flow guide grooves to the width of the water / oxygen flow field area 14 is 1:2.

[0078] The water / oxygen auxiliary flow field 142 comprises a plurality of cylindrical columns arranged in a dot matrix manner;

[0079] The angle between the long right-angled side and the hypotenuse of the water / oxygen secondary flow field 142 ranges from 10° to 30°. For example, the angle between the long right-angled side and the hypotenuse of the water / oxygen secondary flow field 142 is 15°.

[0080] The depth range of the hydrogen flow field region 24, the water / oxygen flow field region 14, the inlet guide channel 12, and the outlet guide channel 13 is 0.05-2 mm. Preferably, the depth range is 0.1-1 mm. For example, the depth of the hydrogen flow field region 24, the water / oxygen flow field region 14, the inlet guide channel 12, and the outlet guide channel 13 is 0.5 mm.

[0081] This invention optimizes the design of the water / oxygen flow field region 14 and the hydrogen flow field region 24. By using longitudinal guide channels and lattice-shaped cylinders, the water flow can be distributed more evenly, effectively avoiding local high temperature phenomena, enhancing gas flow, and reducing dead zones. This ensures the uniform distribution of the water / oxygen two-phase flow and hydrogen flow in the flow field region, thereby improving the service life of the bipolar plate and the electrolysis efficiency.

[0082] The water / oxygen flow field region 14 is used for the anodic reaction, and the hydrogen flow field region 24 is used for the cathodic reaction. The inlet 2 is for water intake, the inlet guide channel 12 is for initial water diversion, the water / oxygen flow field region 14 is for uniform water transport and the site for oxygen production in the anodic reaction, and the outlet / oxygen port 3 is for the discharge of water and oxygen. The hydrogen flow field region 24 is the site for hydrogen production in the cathodic reaction, and two hydrogen outlets are for hydrogen discharge.

[0083] like Figure 3 and Figure 5 As shown, the projection positions of part of the anode closed sealing groove 15 and part of the cathode closed sealing groove 22 on the cross-section of the bipolar plate body 1 are the same, and the cross-section of the closed sealing groove is rectangular. The anode sealing ring 16 and the cathode sealing ring 23 are placed in the corresponding anode closed sealing groove 15 and cathode closed sealing groove 22, respectively, and are bonded and fixed to the closed sealing groove by means of primer adhesive 7, ensuring the stability of the sealing ring.

[0084] Furthermore, the cross-sections of the anode sealing ring 16 and the cathode sealing ring 23 are also rectangular, with a compression rate of 8-30% and a filling rate (ratio of the sealing ring cross-sectional area to the closed sealing groove cross-sectional area) of 60-90%. These parameters ensure proper compression and sealing effect of the sealing rings in the closed sealing groove. In particular, the cathode sealing ring 23 has two strip-shaped protrusions 231 on its side away from the bipolar plate body 1. These protrusions are peak-shaped and valley-shaped, increasing the irregularity of the sealing contact surface, thereby forming a tighter seal during compression and effectively reducing the risk of leakage.

[0085] The cross section of the anode closed sealing groove 15 and the cathode closed sealing groove 22 is rectangular, and the depth is 0.1-1mm, and the width is 1-10mm.

[0086] Figure 4 (a) is a schematic diagram before compression; Figure 4 (b) is a schematic diagram after compression. As Figure 4 (a) shows, the sealing unit is composed of a bipolar plate body 1, an anode sealing ring 16, a membrane electrode frame film 8, a cathode sealing ring 23 and another bipolar plate body 1 on the other side. By adding strip-shaped protrusions 231 to the cathode sealing ring 23, the protrusions are arranged alternately in peak and valley shapes, and the peak and valley shapes of the protrusions help to form a more compact and irregular wavy sealing contact surface when assembled under pressure (as Figure 4 (b) shows), effectively reducing the risk of gas leakage through the sealing surface between the sealing ring and the membrane electrode frame film 8, thereby further improving the sealing reliability of the electrolytic cell.

[0087] In some embodiments, the material of the sealing ring can be selected from rubber materials such as fluororubber, ethylene propylene diene rubber and silicone rubber. In the present embodiment, the material of the sealing ring is selected to be ethylene propylene diene rubber, which can meet the sealing performance requirements of the PEM electrolytic cell under a pressure of 5MPa. The production of the sealing ring can be realized by laser cutting technology or mold opening process, thereby manufacturing the sealing ring with the designed specifications. The two methods have their own advantages, and the most suitable manufacturing process can be selected according to the production demand, cost benefit and design complexity of the sealing ring, to ensure that the quality and performance of the sealing ring meet the requirements of specific applications.

[0088] In some embodiments, the bipolar plate body 1 is made of metal material, which can be selected from titanium or stainless steel. These metal materials not only have good mechanical properties, but also have excellent electrical conductivity and thermal conductivity. In order to further enhance the corrosion resistance of the bipolar plate, prevent rapid corrosion during the electrochemical reaction process, the surface of the bipolar plate body 1 is provided with a protective plating layer, and the optional plating layer materials include gold, platinum or composite materials. In terms of processing technology, the metal bipolar plate can be processed by precision processes such as stamping forming or etching, to ensure the precision and quality of the bipolar plate.

[0089] As Figure 1 and Figure 2 shown, the edge position of the bipolar plate body 1 is uniformly distributed with a plurality of fastener holes 5. The function of these fastener holes 5 is to fix the stacked bipolar plates in the electrolytic cell, and to ensure the sealing of each electrolytic cell by compressing the sealing ring.

[0090] Further, the fastener hole 5 is arranged between the water inlet 2 and the second hydrogen outlet 9, so as to guarantee the sealing effect between the water inlet 2 and the second hydrogen outlet 9, and effectively prevent the leakage of gas and liquid.

[0091] The bipolar plate body 1 is further provided with a positioning hole 6, and the four positioning holes 6 are arranged at four corners of the bipolar plate body 1.

[0092] It should be noted that the cathode surface 21 of the bipolar plate body 1 has the same structure design as the anode surface 11. Therefore, the structure of the cathode surface 21 will not be described additionally in this embodiment. The bipolar plate adopts a perfect central symmetry structure, and the anode surface 11 and the cathode surface 21 are completely consistent in structure, which eliminates the need to distinguish the front and back surfaces in the assembly process, thereby simplifying the assembly process. This symmetry not only improves the convenience of assembly, but also reduces the complexity in the processing process, thereby reducing the production cost and being conducive to realizing the batch production of the bipolar plate; through this design, the universality and production efficiency of the electrolytic cell assembly are improved while the cost-effectiveness is maintained.

[0093] It should be noted that the parts with chamfering requirements in each structure of the bipolar plate body 1 can be chamfered, and the utility model does not make special description.

[0094] The utility model discloses a bipolar plate for proton exchange membrane electrolytic cell, which can effectively improve the performance of the electrolytic cell, enhance its tolerance in high pressure, high temperature and strong oxidation environment, and realize more efficient, safer and more stable green hydrogen production.

[0095] The working process of the proton exchange membrane electrolytic cell sealing bipolar plate is described as follows: the two end surfaces of the bipolar plate body 1 are an anode surface 11 and a cathode surface 21, respectively; the anode surface 11 is provided with a water / oxygen flow field area 14 for water electrolysis and oxygen generation; the two ends of the water / oxygen flow field area 14 are provided with a water inlet 2 and a water / oxygen outlet 3, respectively, for water inlet and oxygen outlet of the water / oxygen flow field area 14; the cathode surface 21 is provided with a hydrogen flow field area 24 corresponding to the position of the anode surface 11, which is used for receiving protons generated by electrolysis of water on the anode surface 11; the protons are transmitted to the cathode surface 21 through a proton exchange membrane and react to generate hydrogen gas; the cathode surface 21 is provided with a hydrogen outlet at the two ends of the hydrogen flow field area 24 for hydrogen outlet.

[0096] In conclusion, the utility model embodiment provides a kind of proton exchange membrane electrolytic cell sealing bipolar plate, and the independent division of area is realized by closed sealing groove, effectively avoid the potential leakage and gas mixing risk caused by sealing groove intersection point in traditional sealing structure.Combining the accurate cooperation between bipolar plate groove, sealing ring and membrane electrode assembly, not only the reliability of sealing is guaranteed under high pressure environment, but also the uniform distribution of contact resistance between bipolar plate and porous diffusion layer is realized, and then the efficiency and safety of electrolytic cell are improved.

[0097] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A proton exchange membrane electrolyser sealed bipolar plate characterised in that, Comprise: The bipolar plate body (1), water inlet (2), water / oxygen outlet (3), first hydrogen outlet (4), second hydrogen outlet (9), water / oxygen flow field area (14), hydrogen flow field area (24), anode closed sealing groove (15) and anode sealing ring (16); The first hydrogen outlet (4), water / oxygen outlet (3), second hydrogen outlet (9) and water inlet (2) are located at the edge of the bipolar plate body (1), and are all through holes; The first hydrogen outlet (4) and the second hydrogen outlet (9) are diagonally arranged; The water inlet (2) and the water / oxygen outlet (3) are diagonally arranged; The water / oxygen flow field area (14) is arranged on the anode surface (11) of the bipolar plate body (1); The hydrogen flow field area (24) is arranged on the cathode surface (21) of the bipolar plate body (1); The anode closed sealing groove (15) is arranged on the anode surface (11) of the bipolar plate body (1); The first hydrogen outlet (4) and the second hydrogen outlet (9) are provided with an anode closed sealing groove (15) periphery; The water inlet (2), water / oxygen flow field area (14) and water / oxygen outlet (3) are provided with an anode closed sealing groove (15) periphery; The anode closed sealing groove (15) is provided with an anode sealing ring (16).

2. The proton exchange membrane electrolyser sealed bipolar plate of claim 1, wherein, Further comprising: water inlet flow guide groove (12) and water / oxygen outlet flow guide groove (13); A plurality of water inlet flow guide grooves (12) are arranged between the water inlet (2) and the water / oxygen flow field area (14); A plurality of water / oxygen outlet flow guide grooves (13) are arranged between the water / oxygen outlet (3) and the water / oxygen flow field area (14).

3. The proton exchange membrane electrolyser sealed bipolar plate of claim 2, characterised in that, The water / oxygen flow field area (14) comprises a water / oxygen main flow field (141) and a water / oxygen auxiliary flow field (142); The water / oxygen flow field area (14) is rectangular as a whole; The water / oxygen auxiliary flow field (142) is arranged above and below the water / oxygen main flow field (141) respectively; The water / oxygen main flow field (141) is parallelogram as a whole; The water / oxygen auxiliary flow field (142) is right triangle as a whole.

4. The proton exchange membrane electrolyser sealed bipolar plate of claim 3, wherein, The water / oxygen main flow field (141) comprises a plurality of longitudinal flow guide grooves; The width of the longitudinal flow guide groove ranges from 0.5 to 5mm; The spacing between the longitudinal flow guide grooves ranges from 0.5 to 5mm; The ratio of the total width of the longitudinal flow guide grooves to the width of the water / oxygen flow field area (14) ranges from 1:1.3 to 2.

5. The proton exchange membrane electrolyser sealed bipolar plate according to claim 3 or 4, characterised in that, The water / oxygen auxiliary flow field (142) comprises a plurality of cylindrical columns arranged in a dot matrix; The angle between the long right angle side and the oblique side of the water / oxygen auxiliary flow field (142) ranges from 10 to 30°.

6. The proton exchange membrane electrolyser sealed bipolar plate of claim 3, wherein, The depth of the hydrogen flow field area (24), the water / oxygen flow field area (14), the water inlet flow guide groove (12) and the water / oxygen outlet flow guide groove (13) ranges from 0.05 to 2mm.

7. The proton exchange membrane electrolyser sealed bipolar plate of claim 1, wherein, Further comprising: cathode closed sealing groove (22) and cathode sealing ring (23); The cathode closed sealing groove (22) is arranged on the cathode surface (21); The cathode sealing ring (23) is provided with a plurality of strip-shaped protrusions (231) on the side away from the bipolar plate body (1); The water inlet (2) and the water / oxygen outlet (3) are provided with cathode closed sealing grooves (22) on the periphery; The first hydrogen outlet (4), the second hydrogen outlet (9) and the hydrogen flow field area (24) are provided with cathode closed sealing grooves (22) on the periphery; The cathode closed sealing grooves (22) are provided with cathode sealing rings (23) inside.

8. The proton exchange membrane electrolyser sealed bipolar plate of claim 7, characterised in that, The cross sections of the anode sealing ring (16) and the cathode sealing ring (23) are rectangular, the compression rate is 8-30%, and the filling rate of the closed sealing groove is 60-90%.

9. The proton exchange membrane electrolyser sealed bipolar plate of claim 8, characterised in that, The cross sections of the anode closed sealing groove (15) and the cathode closed sealing groove (22) are rectangular, the depth is 0.1-1mm, and the width is 1-10mm.

10. The proton exchange membrane electrolyser sealed bipolar plate of claim 1, wherein, Further comprising: Fastener holes (5) and positioning holes (6); A plurality of fastener holes (5) are arranged on the four peripheral edges of the bipolar plate body (1); The bipolar plate body (1) is provided with positioning holes (6) at the four corners.

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