Bipolar plate device, alkaline electrolytic bath and hydrogen production system

Abstract

The invention relates to the technical field of electrolytic hydrogen production, and provides a bipolar plate device, an alkaline electrolytic bath and a hydrogen production system.The bipolar plate device comprises a bipolar plate and an elastic net, and the bipolar plate is provided with an alkaline liquor inlet and a gas outlet which are distributed in the reference direction; an elastic net is arranged on at least one side of the bipolar plate, the elastic net and the bipolar plate are fixed, the elastic net is formed by weaving filiform materials, a plurality of flow guide grooves are formed in the surfaces of the two sides of the elastic net and distributed in the reference direction, and the projection area of each flow guide groove is in a corrugated shape in the thickness direction of the bipolar plate. The main axis of the corrugation is perpendicular to the reference direction. According to the arrangement, the elastic net is arranged on one side of the bipolar plate, the elastic net is the woven piece, the woven gaps of the elastic net can allow alkali liquor to circulate, and the flow guide grooves in the surface of the elastic net can guide the alkali liquor flowing to the flow guide grooves, so that the alkali liquor is promoted to circulate and diffuse in the direction perpendicular to the reference direction, and the alkali liquor is uniformly distributed; the distribution uniformity of the flow velocity of the alkali liquor is improved.

Description

Technical Field

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

[0002] An alkaline electrolyzer is composed of several electrolytic chambers, which usually contain cathodes, anodes, diaphragms, bipolar plates, gaskets, etc. Traditional electrolyzers mostly use papillary bipolar plates, which are formed with papillary protrusions and depressions on the bipolar plates through stamping technology. Due to the defects of papillary bipolar plate technology, such as high requirements for electrolytic cell assembly process and positioning, large internal resistance of the electrolytic cell, difficulty in achieving higher current density, and complex processing, planar bipolar plates are gradually used to replace papillary bipolar plates.

[0003] Planar bipolar plates are easy to process and have high electrolytic cell assembly efficiency. An elastic support structure is provided between the bipolar plate and the electrode, so that the membrane distance can be achieved inside the electrolytic cell, which greatly increases the current density of the electrolytic cell, reduces power consumption, and improves performance. However, after adopting a planar bipolar plate, since the nipple-shaped flow field is eliminated, after the alkali solution enters the electrolytic chamber through the plate pores, the flow resistance of the elastic support structure is small, and the dispersion effect of the flow field is lacking, resulting in the flow velocity at the edge positions on both sides of the electrolytic chamber being inconsistent with the flow velocity in the middle position, and the flow velocity at the two sides is low, which is prone to dead zones. The temperature inside the electrolytic cell is uneven, which can easily lead to overheating in local locations due to slow flow velocity, seriously affecting the safe operation of the electrolytic cell.

[0004] Therefore, how to solve the problem of uneven distribution of alkali solution flow rate on the bipolar plate when a planar bipolar plate is used in the related art has become an important technical problem to be solved by those skilled in the art. Summary of the invention

[0005] The present invention provides a bipolar plate device, an alkaline electrolyzer and a hydrogen production system, which are used to solve the defect of uneven distribution of alkaline solution flow rate on the bipolar plate when a planar bipolar plate is used in the related art.

[0006] The present invention provides a bipolar plate device, comprising: A bipolar plate having an alkali solution inlet and a gas outlet, wherein the alkali solution inlet and the gas outlet are respectively arranged at two ends of the bipolar plate along a reference direction; An elastic net is provided on at least one side of the bipolar plate, the elastic net is fixedly connected to the bipolar plate, the elastic net is woven from a filamentary material, a plurality of guide grooves are formed on the surfaces of both sides of the elastic net, the plurality of guide grooves are distributed along the reference direction, and along the thickness direction of the bipolar plate, the projection area of ​​each guide groove is corrugated, and the main axis of the corrugation is perpendicular to the reference direction.

[0007] According to a bipolar plate device provided by the present invention, the guide grooves are provided with at least two groups, each group of the guide grooves includes at least two guide grooves, and the guide grooves of each group are distributed along the reference direction; In two adjacent groups of the guide grooves, the size parameter of the one close to the alkali solution inlet is smaller than the size parameter of the one far from the alkali solution inlet, and the size parameter includes the corrugation spacing and the corrugation depth.

[0008] According to a bipolar plate device provided by the present invention, the guide grooves are provided with two groups, and among the two groups of guide grooves, one close to the alkali solution inlet is a first guide groove, and the other is a second guide groove; The corrugation pitch of the first guide groove is 10-15 mm, and the corrugation depth of the first guide groove is 4-8 mm; The corrugation pitch of the second guide groove is 20-25 mm, and the corrugation depth of the second guide groove is 10-14 mm.

[0009] According to a bipolar plate device provided by the present invention, the elastic net includes at least two sub-elastic nets, each of the sub-elastic nets is distributed along the reference direction, and a group of the guide grooves is correspondingly arranged on the surface of each sub-elastic net.

[0010] A bipolar plate device according to the present invention further includes: A diverter plate is arranged between two adjacent sub-elastic nets. The diverter plate is fixedly connected to the bipolar plate. A plurality of diverter holes are arranged on the diverter plate. The plurality of diverter holes are distributed at intervals on the diverter plate. Along the reference direction, the diverter holes penetrate the diverter plate.

[0011] According to a bipolar plate device provided by the present invention, the diverter plate has a first diverter region and a second diverter region, and along the reference direction, the projection area of ​​the alkali solution inlet is located inside the projection area of ​​the first diverter region, and the projection area of ​​the alkali solution inlet is located outside the projection area of ​​the second diverter region; The diverter hole includes a first diverter hole and a second diverter hole. The first diverter hole is arranged in the first diverter area, the second diverter hole is arranged in the second diverter area, and the cross-sectional area of ​​the first diverter hole is smaller than the cross-sectional area of ​​the second diverter hole.

[0012] According to a bipolar plate device provided by the present invention, a connecting portion is provided at the edge of the elastic net, and the connecting portion is fixed to the bipolar plate by spot welding.

[0013] A bipolar plate device according to the present invention further includes: The punched and drawn net is provided with the elastic net on one side of the bipolar plate and the punched and drawn net on the other side of the bipolar plate. The punched and drawn net is formed by punching a thin plate and then drawing it along the thickness direction of the thin plate.

[0014] The present invention also provides an alkaline electrolytic cell, comprising the above-mentioned bipolar plate device.

[0015] The present invention also provides a hydrogen production system, comprising the above-mentioned bipolar plate device, or comprising the above-mentioned alkaline electrolyzer.

[0016] The bipolar plate device provided by the present invention includes a bipolar plate and an elastic net, wherein the bipolar plate has an alkali solution inlet and a gas outlet, and the alkali solution inlet and the gas outlet are respectively arranged at both ends of the bipolar plate along the reference direction. An elastic net is arranged on at least one side of the bipolar plate, and the elastic net is fixedly connected to the bipolar plate. The elastic net is woven from a filamentary material, and the elastic net itself has a woven gap, and the alkali solution can flow through the woven gap. A plurality of guide grooves are formed on the surfaces of both sides of the elastic net, and the plurality of guide grooves are distributed along the reference direction. Along the thickness direction of the bipolar plate, the projected area of ​​each guide groove is corrugated, and the main axis of the corrugation is perpendicular to the reference direction. With such an arrangement, the alkali solution will pass through the guide groove during its circulation process. The guide groove can guide the alkali solution that flows to the position of the guide groove to promote the alkali solution to flow and diffuse in a direction perpendicular to the reference direction, that is, to promote the alkali solution to diffuse to the edges of both sides of the bipolar plate, so that the alkali solution is evenly distributed on the bipolar plate, and the consistency of the flow rate at the edge positions on both sides of the electrolysis chamber and the middle position is improved, which solves the problem of uneven distribution of the alkali solution flow rate on the bipolar plate when a planar bipolar plate is used in the related technology.

[0017] Furthermore, in the alkaline electrolytic cell provided by the present invention, since it is provided with the bipolar plate device as described above, it also has the various advantages as described above.

[0018] Furthermore, in the hydrogen production system provided by the present invention, since it is provided with the bipolar plate device or alkaline electrolyzer as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 Schematic diagram of the structure of the bipolar plate device provided by the present invention (the wavy lines in the figure represent guide grooves).

[0021] Figure 2It is a schematic diagram of the size parameters of the guide groove provided by the present invention (the first guide groove shown in the figure is its projection along the thickness direction of the elastic net).

[0022] Figure 3 It is a structural schematic diagram of the diverter plate provided by the present invention.

[0023] Figure 4 It is a partial structural schematic diagram of the first elastic net provided by the present invention (the filamentary materials and the woven gaps therebetween are not shown in the figure).

[0024] Reference numerals: 1. Alkali liquid inlet; 2. Hydrogen outlet; 3. Oxygen outlet; 4. First guide groove; 5. Second guide groove; 6. First sub-elastic net; 7. Second sub-elastic net; 8. Diverter plate; 9. First diverter area; 10. Second diverter area; 11. First diverter hole; 12. Second diverter hole; 13. Electrode frame; 14. First gas flow channel; 15. Alkali liquid flow channel. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figures 1 to 4 The bipolar plate arrangement of the present invention is described.

[0027] like Figures 1 to 4 As shown, the bipolar plate device provided by the embodiment of the present invention includes a bipolar plate and an elastic net.

[0028] Specifically, the bipolar plate has an alkali solution inlet 1 and a gas outlet. Along the reference direction, the alkali solution inlet 1 and the gas outlet are respectively arranged at both ends of the bipolar plate. The reference direction is as follows: Figure 1 The direction indicated by y.

[0029] Specifically, the bipolar plate includes a bipolar plate body and a pole frame 13 arranged at a circumferential position of the bipolar plate body. The thickness of the pole frame 13 is greater than the thickness of the bipolar plate body, and the two side surfaces of the bipolar plate body are regarded as flow field areas. The alkali liquid inlet 1 and the gas outlet are arranged on the pole frame 13, and the alkali liquid inlet 1 and the gas outlet both penetrate the pole frame 13 along the thickness direction of the bipolar plate body.

[0030] At least one alkali liquid inlet 1 is provided, and alkali liquid flow channels 15 are provided on both sides of the pole frame 13, respectively, for connecting the alkali liquid inlet 1 with the flow field areas on both sides of the bipolar plate body, so that the alkali liquid flows to the flow field areas on both sides of the bipolar plate body through the alkali liquid inlet 1 and the alkali liquid flow channels 15.

[0031] At least two gas outlets are provided, and a first gas flow channel 14 is provided on the first side of the pole frame 13, and at least one of the gas outlets is connected to the flow field area on the first side of the bipolar plate body, so that the alkali liquid and the generated gas in the flow field area on the first side of the bipolar plate body are discharged through the gas outlet. The gas outlet can be a hydrogen outlet 2.

[0032] A second gas flow channel is provided on the second side of the pole frame 13, and the remaining gas outlets are connected to the flow field area on the second side of the bipolar plate body, so that the alkali liquid and the generated gas in the flow field area on the second side of the bipolar plate body are discharged through the gas outlet. The gas outlet can be an oxygen outlet 3.

[0033] The bipolar plate can be set in a rectangular or circular shape. Figure 1 The bipolar plate is arranged in a circular shape, two alkali solution inlets 1 are arranged at one end of the pole frame 13 along the reference direction, and two hydrogen outlets 2 and two oxygen outlets 3 are arranged at the other end of the pole frame 13 along the reference direction. The hydrogen outlet 2 and the oxygen outlet 3 are arranged near the diameter corresponding to the alkali solution inlet 1.

[0034] The position on the bipolar plate body that is closer to the diameter corresponding to the alkali solution inlet 1 is called the middle position of the bipolar plate body, and the position on the bipolar plate body that is farther from the diameter corresponding to the alkali solution inlet 1 is called the edge positions on both sides of the bipolar plate body.

[0035] The surfaces on both sides of the bipolar plate body are flat and have no mastoid structure, so no secondary processing is required. If there are no effective diverters on both sides of the bipolar plate body, the alkali solution will flow from the alkali solution inlet 1 to the flow field area of ​​the bipolar plate body, and then directly flow to the hydrogen outlet 2 or the oxygen outlet 3 along the reference direction. It will not diffuse in a direction perpendicular to the reference direction, resulting in more alkali solution and faster flow rate in the middle of the bipolar plate body, and less alkali solution and slower flow rate at the edges of the two sides of the bipolar plate body.

[0036] In the embodiment of the present invention, an elastic net is provided on at least one side of the bipolar plate, and the elastic net is fixedly connected to the bipolar plate. The elastic net is woven from a filamentary material, and the elastic net itself has woven gaps, and the alkali solution can flow through the woven gaps. The filamentary material of the elastic net has a disturbing effect on the alkali solution.

[0037] A plurality of guide grooves are formed on both sides of the elastic net, and the plurality of guide grooves are distributed along the reference direction, and two adjacent guide grooves are independent of each other. Along the thickness direction of the bipolar plate, the projection area of ​​the guide groove is corrugated, and the main axis of the corrugation is perpendicular to the reference direction. Figure 1 The direction indicated by x.

[0038] Specifically, each corrugated guide groove can be regarded as formed by a plurality of V-shaped grooves connected to each other, and the plurality of V-shaped grooves are distributed and connected along a direction perpendicular to the reference direction.

[0039] With such an arrangement, the alkali solution will pass through the guide groove during its circulation process. The guide groove can guide the alkali solution that flows to the position of the guide groove, so that the alkali solution flows and diffuses along the direction of the corrugated main axis, that is, the alkali solution is prompted to flow and diffuse in a direction perpendicular to the reference direction, and the alkali solution is prompted to diffuse to the edges of both sides of the bipolar plate, so that the alkali solution is evenly distributed on the bipolar plate, thereby improving the consistency of the flow rate at the edge positions and the middle position on both sides of the electrolysis chamber, and solving the problem of uneven distribution of the alkali solution flow rate on the bipolar plate when a planar bipolar plate is used in the related technology.

[0040] For the processing of the elastic net, the filamentary material can be woven first to form a flat plate with woven gaps, and then the flat plate structure is stamped and formed by a stamping die to make the flat plate structure bend to form an elastic net with corrugated guide grooves.

[0041] The filamentous material may be, but is not limited to, nickel wire.

[0042] Along the thickness direction of the elastic net, the projection area of ​​the guide groove is in a corrugated shape with crests and troughs. A plurality of guide grooves are distributed along a reference direction, and the main axes of the guide grooves are parallel to each other and perpendicular to the reference direction.

[0043] The cross section of the elastic net along the reference direction is also corrugated. Figure 4 The guide grooves on both sides of the elastic net are arranged alternately. A ridge is formed between two adjacent guide grooves on one side of the elastic net, and the guide grooves on one side of the elastic net correspond to the ridges on the other side of the elastic net, and the ridges on one side of the elastic net correspond to the guide grooves on the other side of the elastic net.

[0044] In some embodiments, the size parameters of the guide grooves distributed along the reference direction are consistent.

[0045] The dimensional parameters of the guide groove include the corrugation pitch and corrugation depth. The corrugation pitch is the distance between two wave crests of the corrugated guide groove, such as Figure 2 The distance indicated by m in the figure; the corrugation depth is the distance between the crest and the trough of the corrugated flow channel, such as Figure 2 The distance indicated by n.

[0046] In this case, each diversion groove has the same diversion effect on the alkali solution.

[0047] In some other embodiments, the size parameters of the guide grooves distributed along the reference direction are different. Specifically, at least two groups of guide grooves are provided, each group of guide grooves includes at least two guide grooves, and each group of guide grooves is distributed along the reference direction.

[0048] The size parameters of the guide grooves in each group of guide grooves are the same, and the guide grooves in each group have the same guiding effect on the alkali solution.

[0049] In two adjacent groups of guide grooves, the size parameter of the one close to the alkali solution inlet 1 is smaller than the size parameter of the one far from the alkali solution inlet 1 .

[0050] In this case, the guide groove with a smaller size parameter can effectively disperse the alkali solution to the two side edges of the bipolar plate. As the distance from the alkali solution inlet 1 increases, the proportion of the generated gas increases. The size parameter of the guide groove is set relatively large. While the alkali solution continues to disperse to the two side edges of the bipolar plate, the flow resistance can also be reduced to facilitate the discharge of the generated gas.

[0051] The size parameters of the guide grooves in each group are the same, so that the crests and troughs of the multiple guide grooves correspond to each other, and the straight lines where the crests of the multiple guide grooves are located and the straight lines where the troughs of the multiple guide grooves are located are parallel to the reference direction.

[0052] In this embodiment, two groups of guide grooves are provided. Among the two groups of guide grooves, one close to the alkali solution inlet 1 is the first guide groove 4 , and the other is the second guide groove 5 .

[0053] The corrugation pitch of the first guide groove 4 is 10-15 mm, and the corrugation depth of the first guide groove 4 is 4-8 mm. Specifically, the corrugation pitch of the first guide groove 4 can be set to 13 mm, and the corrugation depth of the first guide groove 4 can be set to 6 mm.

[0054] The corrugation pitch of the second guide groove 5 is 20-25 mm, and the corrugation depth of the second guide groove 5 is 10-14 mm. Specifically, the corrugation pitch of the second guide groove 5 can be set to 23 mm, and the corrugation depth of the second guide groove 5 can be set to 12 mm.

[0055] When setting guide grooves with different size parameters, the guide grooves with different size parameters can be processed on the same elastic net, or the elastic net can be divided into blocks, and the guide grooves with the same size parameters can be processed on each block, and the size parameters of the guide grooves processed on different blocks are different.

[0056] In this embodiment, the elastic net is divided into blocks, that is, the elastic net includes at least two sub-elastic nets, each sub-elastic net is distributed along a reference direction, and a group of guide grooves are correspondingly arranged on the surface of each sub-elastic net.

[0057] Reference Figure 1 The elastic net includes a first sub-elastic net 6 and a second sub-elastic net 7 , the first guide groove 4 is arranged on the first sub-elastic net 6 , and the second guide groove 5 is arranged on the second sub-elastic net 7 .

[0058] In a further embodiment, the bipolar plate device further includes a diverter plate 8, which is disposed between two adjacent sub-elastic nets and is fixedly connected to the bipolar plate.

[0059] The splitter plate 8 is a flat plate structure, and the plane where the splitter plate 8 is located is perpendicular to the reference direction. The width direction of the splitter plate 8 is parallel to the thickness direction of the bipolar plate, and the length direction of the splitter plate 8 is perpendicular to the reference direction and the thickness direction of the bipolar plate. The position where the splitter plate 8 contacts the bipolar plate is fixed by spot welding.

[0060] A plurality of diverter holes are arranged on the diverter plate 8, and the plurality of diverter holes are distributed at intervals on the diverter plate 8. The diverter holes penetrate the diverter plate 8 along the reference direction.

[0061] Figure 3 What is shown is a view of the diverter plate 8 along the reference direction. Two rows of diverter holes are arranged on the diverter plate 8. The two rows of diverter holes are spaced apart along the thickness direction of the bipolar plate, and the diverter holes in each row are spaced apart along a direction perpendicular to the reference direction.

[0062] After being guided and diverted by the first sub-elastic net 6 , the alkali solution passes through the diverter plate 8 and is diverted again by the diverter plate 8 , so that the alkali solution is dispersed more evenly.

[0063] The diverter holes on the diverter plate 8 can be formed by a stamping process or a laser cutting process.

[0064] The cross section of the diverter hole is the direction of the diverter hole perpendicular to the reference direction. The cross section of the diverter hole can be, but is not limited to, circular, square, diamond or waist-shaped.

[0065] In a further embodiment, the diverter plate 8 has a first diverter area 9 and a second diverter area 10. Along the reference direction, the projection area of ​​the alkali liquid inlet 1 is located inside the projection area of ​​the first diverter area 9, and the projection area of ​​the alkali liquid inlet 1 is located outside the projection area of ​​the second diverter area 10.

[0066] That is to say, the position area on the diverter plate 8 corresponding to the alkali solution inlet 1 is regarded as the first diverter area 9 .

[0067] The diverter holes include a first diverter hole 11 and a second diverter hole 12 . The first diverter hole 11 is disposed in the first diverter area 9 , and the second diverter hole 12 is disposed in the second diverter area 10 . The cross-sectional area of ​​the first diverter hole 11 is smaller than that of the second diverter hole 12 .

[0068] In this way, the flow resistance of the first flow-dividing area 9 is relatively large, which is conducive to the diffusion and flow of the alkali solution to the edges of both sides of the bipolar plate. The flow resistance of the second flow-dividing area 10 is relatively small, which is conducive to increasing the flow rate of the alkali solution.

[0069] Reference Figure 1 , the diverter plate 8 has a first diverter area 9 and two second diverter areas 10. Along the reference direction, the two alkali solution inlets 1 correspond to the first diverter area 9. Along the direction perpendicular to the reference direction, the two second diverter areas 10 are located on both sides of the first diverter area 9. The cross-sectional shape of the first diverter hole 11 and the cross-sectional shape of the second diverter hole 12 are both circular, and the cross-sectional diameter of the first diverter hole 11 is smaller than the cross-sectional diameter of the second diverter hole 12.

[0070] The boundary between the first diversion area 9 and the second diversion area 10 and the cross-sectional diameter, number, position, etc. of the first diversion hole 11 and the second diversion hole 12 need to be optimally determined through simulation analysis.

[0071] The elastic net has good compressibility and resilience. When multiple bipolar plate devices, electrodes and diaphragms are stacked together, the elastic net is compressed, the elastic net contacts the electrode, and the distance between the electrode and the diaphragm is reduced, thereby reducing the internal resistance of the alkaline electrolytic cell.

[0072] The splitter plate 8 is a rigid plate, and since the elastic net will be compressed during the stacking and assembly process, the thickness of the elastic net will be reduced. Therefore, during the design process, the width design dimension of the splitter plate needs to be smaller than the thickness design dimension of the elastic net in its natural state, so as to avoid interference of the splitter plate 8 with the compression of the elastic net during the stacking and assembly process.

[0073] The material of the diverter plate 8 can be, but is not limited to, pure nickel or carbon steel plated with nickel. The thickness of the diverter plate 8 is 0.2-1 mm.

[0074] In the embodiment of the present invention, a connection portion is provided at the edge of the elastic net, and the connection portion is used to be fixedly connected to the bipolar plate. Specifically, it can be achieved by a spot welding process.

[0075] Before spot welding, the arc edge of the elastic net can be pressed to make the arc edge of the elastic net more compact and smooth for easy fixation. The pressing width is 5~15 mm.

[0076] For the first elastic sub-net 6 , the edge pressing portion can be directly fixed to the bipolar plate by spot welding.

[0077] For the second sub-elastic net 7, the strength of the second sub-elastic net 7 and the strength of its fixed connection with the bipolar plate are required to be relatively high, and the edge portion can be further sealed to reduce the deformation of the second sub-elastic net 7. During the edge sealing process, a nickel strip can be used to wrap the arc edge of the second sub-elastic net 7. During welding and fixing, the second sub-elastic net 7 is fixed to the bipolar plate by spot welding at the nickel strip.

[0078] It should be noted that the position of the second sub-elastic net 7 corresponding to the gas outlet is not sealed to ensure smooth discharge of the gas.

[0079] In some embodiments, an elastic mesh may be provided on both sides of the bipolar plate.

[0080] In this embodiment, the bipolar plate device further includes a punched and stretched mesh, an elastic mesh is arranged on one side of the bipolar plate, and a punched and stretched mesh is arranged on the other side of the bipolar plate, and the punched and stretched mesh is welded and fixed to the bipolar plate.

[0081] The punched and stretched net is made by punching a thin plate and then drawing it along the thickness direction of the thin plate. Specifically, multiple rows of slits are processed on the thin plate, and the multiple rows of slits are spaced along the reference direction. The distribution direction of each slit in each row and the extension direction of each slit are perpendicular to the reference direction. Then, a force is applied to the parts on both sides of any slit on the thin plate in a direction perpendicular to the thin plate and in opposite directions, so that the parts on both sides of the slit bulge in different directions, thereby obtaining the punched and stretched net. The overall thickness of the punched and stretched net is greater than that of the thin plate, and the punched and stretched net has mesh holes with the opening direction along the reference direction for the circulation of alkali solution.

[0082] The thin plate may be, but is not limited to, a carbon steel thin plate or a pure nickel thin plate.

[0083] The punched and stretched mesh has excellent supporting properties and can effectively support the electrode to ensure the stability of the electrode.

[0084] On the other hand, an embodiment of the present invention further provides an alkaline electrolytic cell, comprising a bipolar plate device provided in any of the above embodiments. The bipolar plate device provided in any of the above embodiments can effectively divert the alkali solution, so that the alkali solution is evenly distributed on the bipolar plate, and the consistency of the flow rate at the edge positions on both sides of the electrolysis chamber and the middle position is improved. Therefore, the internal temperature of the alkaline electrolytic cell in this embodiment is uniform, and it is not easy to have the problem of overheating at a local position due to slow flow rate, and it can operate safely. The derivation process of the beneficial effects of the alkaline electrolytic cell in the embodiment of the present invention is generally similar to the derivation process of the beneficial effects of the above-mentioned bipolar plate device, so it will not be repeated here.

[0085] On the other hand, an embodiment of the present invention further provides a hydrogen production system, including a bipolar plate device or an alkaline electrolyzer provided in any of the above embodiments. It has all the advantages of the above bipolar plate device or alkaline electrolyzer, which will not be repeated here. The derivation process of the beneficial effects of the hydrogen production system in the embodiment of the present invention is generally similar to the derivation process of the beneficial effects of the above bipolar plate device or alkaline electrolyzer, so it will not be repeated here.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bipolar plate device, characterized in that: include: A bipolar plate having an alkali solution inlet (1) and a gas outlet, wherein the alkali solution inlet (1) and the gas outlet are respectively arranged at two ends of the bipolar plate along a reference direction; An elastic net is provided on at least one side of the bipolar plate, the elastic net is fixedly connected to the bipolar plate, the elastic net is woven from a filamentary material, a plurality of guide grooves are formed on the surfaces of both sides of the elastic net, the plurality of guide grooves are distributed along the reference direction, and along the thickness direction of the bipolar plate, the projection area of ​​each guide groove is corrugated, and the main axis of the corrugation is perpendicular to the reference direction.

2. The bipolar plate device according to claim 1, characterized in that: The guide grooves are provided with at least two groups, each group of the guide grooves includes at least two guide grooves, and the guide grooves in each group are distributed along the reference direction; In two adjacent groups of guide grooves, the size parameter of the one close to the alkali solution inlet (1) is smaller than the size parameter of the one far from the alkali solution inlet (1), and the size parameter includes the corrugation spacing and the corrugation depth.

3. The bipolar plate device according to claim 2, characterized in that: The guide grooves are provided in two groups. Of the two groups of guide grooves, one close to the alkali solution inlet (1) is a first guide groove (4), and the other is a second guide groove (5); The corrugation pitch of the first guide groove (4) is 10 to 15 millimeters, and the corrugation depth of the first guide groove (4) is 4 to 8 millimeters; The corrugation pitch of the second guide groove (5) is 20-25 mm, and the corrugation depth of the second guide groove (5) is 10-14 mm.

4. The bipolar plate device according to claim 2, characterized in that: The elastic net comprises at least two sub-elastic nets, each of which is distributed along the reference direction, and a group of guide grooves is correspondingly arranged on the surface of each sub-elastic net.

5. The bipolar plate device according to claim 4, characterized in that: Also includes: A diverter plate (8) is arranged between two adjacent sub-elastic nets, the diverter plate (8) is fixedly connected to the bipolar plate, a plurality of diverter holes are arranged on the diverter plate (8), the plurality of diverter holes are spaced apart on the diverter plate (8), and along the reference direction, the diverter holes penetrate the diverter plate (8).

6. The bipolar plate device according to claim 5, characterized in that: The diverter plate (8) has a first diverter area (9) and a second diverter area (10), and along the reference direction, the projection area of ​​the alkali solution inlet (1) is located inside the projection area of ​​the first diverter area (9), and the projection area of ​​the alkali solution inlet (1) is located outside the projection area of ​​the second diverter area (10); The flow diversion holes comprise a first flow diversion hole (11) and a second flow diversion hole (12); the first flow diversion hole (11) is arranged in the first flow diversion area (9), the second flow diversion hole (12) is arranged in the second flow diversion area (10), and the cross-sectional area of ​​the first flow diversion hole (11) is smaller than the cross-sectional area of ​​the second flow diversion hole (12).

7. The bipolar plate device according to any one of claims 1 to 6, characterized in that: A connecting portion is provided at the edge of the elastic net, and the connecting portion is fixed to the bipolar plate by spot welding.

8. The bipolar plate device according to any one of claims 1 to 6, characterized in that: Also includes: The punched and drawn net is provided with the elastic net on one side of the bipolar plate and the punched and drawn net on the other side of the bipolar plate. The punched and drawn net is formed by punching a thin plate and then drawing it along the thickness direction of the thin plate.

9. An alkaline electrolytic cell, characterized in that: Comprising a bipolar plate device as claimed in any one of claims 1 to 8.

10. A hydrogen production system, characterized in that: It comprises the bipolar plate device according to any one of claims 1 to 8, or it comprises the alkaline electrolytic cell according to claim 9.

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