Electrolytic bath and hydrogen production system thereof

Abstract

The utility model provides an electrolytic bath and a hydrogen production system thereof, the electrolytic bath comprises an anode end plate, a cathode end plate and an electrolytic gas production assembly, and the electrolytic gas production assembly is arranged between the anode end plate and the cathode end plate; the electrolytic gas production assembly comprises a diaphragm and an anode diffusion layer which are stacked; the compressive strength of the anode diffusion layer is larger than 3 MPa, the anode diffusion layer abuts against the diaphragm to support the diaphragm, the anode diffusion layer has high compressive strength, under the action of external pressure, the anode diffusion layer is not prone to damage or deformation, meanwhile, the anode diffusion layer abuts against the diaphragm, the anode diffusion layer can provide a supporting effect for the diaphragm, and the service life of the diaphragm is prolonged. When the pressure of the hydrogen generation side is larger than that of the oxygen generation side, the anode diffusion layer can support the diaphragm, so that the problem that the diaphragm deforms under the action of pressure difference is solved.

Description

Technical Field

[0001] This application relates to the field of water electrolysis for hydrogen production technology, specifically to an electrolyzer and its hydrogen production system. Background Technology

[0002] An electrolyzer is a device that decomposes water to produce hydrogen and oxygen. An electrolyzer typically includes one or more electrolytic gas generation components. These components include an anode diffusion layer, an oxygen evolution catalyst layer, a diaphragm, a hydrogen evolution catalyst layer, and a cathode diffusion layer. The diaphragm divides the electrolytic gas generation components into an oxygen-producing chamber and a hydrogen-producing chamber. The anode diffusion layer and the oxygen evolution catalyst layer are located in the oxygen-producing chamber, while the cathode diffusion layer and the hydrogen evolution catalyst layer are located in the hydrogen-producing chamber. Water is electrolyzed at the hydrogen evolution catalyst layer into oxygen, hydrogen ions, and electrons. Hydrogen ions migrate across the diaphragm to the hydrogen-producing chamber, while electrons are transferred to the hydrogen-producing chamber via an external circuit. The electrons and hydrogen ions combine to generate hydrogen gas at the oxygen evolution catalyst layer.

[0003] In some industrial applications, such as fuel cell testing and ultrapure hydrogen production, high-pressure hydrogen needs to be output. Outputting high-pressure hydrogen can easily cause the gas pressure in the hydrogen production chamber to be greater than that in the hydrogen production chamber. The diaphragm is used to separate the hydrogen production chamber and the oxygen production chamber. The diaphragm operates under a high pressure difference on both sides for a long time, which can easily lead to severe deformation of the diaphragm and affect the performance and life of the electrolyzer. Utility Model Content

[0004] The embodiments of this application provide an electrolyzer and its hydrogen production system, which can solve the technical problem that the diaphragm is prone to severe deformation when it operates under a high pressure difference on both sides for a long time, which affects the performance and life of the electrolyzer.

[0005] In a first aspect, embodiments of this application provide an electrolytic cell, including an anode plate, a cathode plate, and an electrolytic gas generation assembly, wherein the electrolytic gas generation assembly is disposed between the anode plate and the cathode plate;

[0006] The electrolytic gas generation assembly includes a diaphragm and an anode diffusion layer stacked sequentially.

[0007] The compressive strength of the anode diffusion layer is greater than 3 MPa, and the anode diffusion layer abuts against the diaphragm to support the diaphragm.

[0008] In one embodiment, the compressive strength of the diaphragm is greater than 2.5 MPa. 。

[0009] In one embodiment, the electrolysis gas generation assembly further includes a first electrode frame, a cathode diffusion layer, and a cathode flow field;

[0010] The first pole frame is located on the side of the diaphragm away from the anode diffusion layer;

[0011] The first electrode frame has a first receiving hole, the cathode diffusion layer and the cathode flow field are located in the first receiving hole, and the cathode flow field is located on the side of the cathode diffusion layer away from the diaphragm.

[0012] In one embodiment, the electrolysis gas generation assembly further includes a second electrode frame and an anode flow field;

[0013] The second pole frame is located on the side of the diaphragm away from the cathode diffusion layer;

[0014] The second pole frame has a second receiving hole, and the anode diffusion layer and the anode flow field are located in the second receiving hole. The anode flow field is located on the side of the anode diffusion layer away from the diaphragm.

[0015] In one embodiment, the first pole frame is provided with a first liquid inlet and a first liquid outlet, the second pole frame is provided with a second liquid inlet and a second liquid outlet, and a turbulence structure is provided at the first liquid inlet and / or the second liquid inlet.

[0016] In one embodiment, the cathode flow field is provided with a first flow guiding structure, which is connected to the first liquid inlet and the first liquid outlet respectively; and / or

[0017] The anode flow field is provided with a second flow guiding structure, which is connected to the second liquid inlet and the second liquid outlet respectively.

[0018] In one embodiment, the electrolysis gas generation assembly further includes a first sealing gasket and a second sealing gasket;

[0019] The first sealing gasket is disposed between the cathode diffusion layer and the diaphragm. The first sealing gasket has a first through hole in the middle. The first sealing gasket is in sealing contact with the cathode diffusion layer and the diaphragm respectively. At least part of the cathode diffusion layer is in communication with the diaphragm through the first through hole.

[0020] The second sealing gasket is disposed between the anode diffusion layer and the diaphragm. The second sealing gasket has a second through hole in the middle. The second sealing gasket is in sealing contact with the anode diffusion layer and the diaphragm respectively. At least part of the anode diffusion layer is connected to the diaphragm through the second through hole.

[0021] In one embodiment, the electrolytic cell further includes a conductive partition;

[0022] The number of the electrolytic gas generation components is at least two, and adjacent electrolytic gas generation components are isolated from each other by the conductive partition.

[0023] In one embodiment, the electrolytic cell further includes an anode current collector and an anode insulating plate, wherein the anode end plate, the anode insulating plate, and the anode current collector are stacked sequentially, and the anode current collector is provided with a first wiring portion for electrical connection to a power source; and / or

[0024] The electrolytic cell also includes a cathode current collector and a cathode insulating plate. The cathode end plate, the cathode insulating plate and the cathode current collector are stacked in sequence. The cathode current collector is provided with a second wiring part, which is used for electrical connection with the power supply.

[0025] Secondly, embodiments of this application provide a hydrogen production system, including the electrolyzer described above.

[0026] The beneficial effects of the embodiments of this application are as follows:

[0027] The electrolytic cell in this embodiment includes an anode plate, a cathode plate, and an electrolytic gas generation assembly, which is disposed between the anode plate and the cathode plate. The electrolytic gas generation assembly includes a diaphragm and an anode diffusion layer stacked together. The anode diffusion layer has a compressive strength greater than 3 MPa. The anode diffusion layer abuts against the diaphragm to support the diaphragm. The anode diffusion layer has high compressive strength, and under external pressure, the anode diffusion layer itself is not easily damaged or deformed. At the same time, the anode diffusion layer abuts against the diaphragm, and the anode diffusion layer can provide support for the diaphragm. When the pressure on the hydrogen generation side is greater than the pressure on the oxygen generation side, the anode diffusion layer can support the diaphragm to reduce the problem of deformation of the diaphragm under the action of pressure difference. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an exploded schematic diagram of an electrolytic cell provided in an embodiment of this application;

[0030] Figure 2 This is an exploded view of the electrolytic cell provided in an embodiment of this application from another angle;

[0031] Figure 3 This is a three-dimensional schematic diagram of the first pole frame provided in an embodiment of this application;

[0032] Figure 4 This is a three-dimensional schematic diagram of the anodic flow field provided in an embodiment of this application;

[0033] Figure 5This is a schematic diagram of the hydrogen production system provided in an embodiment of this application.

[0034] Figure label:

[0035] 100. Hydrogen production system; 1. Liquid storage device; 11. Liquid supply pipeline; 12. First oxygen exhaust pipeline; 13. Second oxygen exhaust pipeline; 14. Water pump; 2. Electrolyzer; 21. Anode end plate; 22. Cathode end plate; 23. Diaphragm; 24. Anode diffusion layer; 25. First electrode frame; 251. First receiving hole; 252. First liquid inlet; 253. First liquid outlet; 254. First receiving tank; 26. Cathode diffusion layer; 27. Cathode flow field; 271. First flow guiding structure; 28. Second electrode frame; 281. Second receiving hole; 282. Second liquid inlet; 283. Second liquid outlet; 284. Second receiving tank 29. Anode flow field; 291. Second flow guiding structure; 210. Turbulence structure; 211. First sealing gasket; 2111. First through hole; 212. Second sealing gasket; 2121. Second through hole; 213. Conductive partition; 214. Anode current collector; 2141. First wiring part; 215. Anode insulating plate; 216. Cathode current collector; 2161. Second wiring part; 217. Cathode insulating plate; 218. Bolt; 3. Hydrogen gas-liquid separator; 31. First hydrogen exhaust pipe; 32. Return water pipe; 33. Second hydrogen exhaust pipe; 4. Hydrogen receiving device; 5. Water supply device; 51. Water supply pipe. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0037] Please refer to Figure 1 and Figure 2The electrolytic cell 2 of this application includes an anode plate 21, a cathode plate 22, and an electrolytic gas generation assembly, which is disposed between the anode plate 21 and the cathode plate 22. The electrolytic gas generation assembly includes a diaphragm 23 and an anode diffusion layer 24 stacked together. The compressive strength of the anode diffusion layer 24 is greater than 3 MPa. The anode diffusion layer 24 abuts against the diaphragm 23 to support the diaphragm 23. The anode diffusion layer 24 has high compressive strength, and under external pressure, the anode diffusion layer 24 itself is not easily damaged or deformed. Meanwhile, the diaphragm 23 typically includes a hydrogen evolution catalyst layer (not shown in the figure) and an oxygen evolution catalyst layer (not shown in the figure). (Not shown in the image) The hydrogen evolution catalyst layer is disposed on the side of the membrane 23 away from the anode diffusion layer 24, and the oxygen evolution catalyst layer is disposed on the side of the membrane 23 closer to the anode diffusion layer 24. Hydrogen evolution catalyst layers and oxygen evolution catalyst layers are disposed on both sides of the membrane 23. During water electrolysis, water generates hydrogen at the hydrogen evolution catalyst layer and oxygen at the oxygen evolution catalyst layer. When the pressure on the hydrogen generation side is greater than the pressure on the oxygen generation side, a pressure difference exists on both sides of the membrane 23. The anode diffusion layer 24 abuts against the membrane 23, providing support to the membrane 23 and reducing deformation caused by the pressure difference. In this embodiment, the material type of the anode diffusion layer 24 is not limited; it can be made of a high-compressive-strength material, such as high-strength nickel or titanium metal mesh.

[0038] In one embodiment, the compressive strength of the diaphragm 23 is greater than 2.5 MPa. In this embodiment, the diaphragm 23 has high compressive strength, and under the action of pressure difference, the diaphragm 23 is not easily damaged or deformed. The diaphragm 23 with high compressive strength, together with the anode diffusion layer 24 with high compressive strength, can further improve the deformation problem of the diaphragm 23. The diaphragm 23 is made of a high-voltage resistant conductive polymer material.

[0039] In one embodiment, please refer to Figure 1 and Figure 2 The electrolytic gas generation assembly also includes a first electrode frame, a cathode diffusion layer 26, and a cathode flow field 27. The first electrode frame is located on the side of the diaphragm 23 away from the anode diffusion layer 24. The first electrode frame has a first receiving hole 251, in which the cathode diffusion layer 26 and the cathode flow field 27 are located. The cathode flow field 27 is located on the side of the cathode diffusion layer 26 away from the diaphragm 23. In this embodiment, both the cathode diffusion layer 26 and the cathode flow field 27 are located in the first receiving hole 251, which can make full use of the first receiving hole 251, making the structure of the electrolytic gas generation assembly more compact and facilitating the miniaturization of the electrolytic cell 2. The first electrode frame is made of a high-pressure resistant polymer material, and the cathode flow field 27 and the cathode diffusion layer 26 are made of a conductive and alkali-resistant corrosion-resistant material.

[0040] In one embodiment, please refer to Figure 1 and Figure 2 The electrolytic gas generation assembly also includes a second electrode frame and an anode flow field 29. The second electrode frame is located on the side of the diaphragm 23 away from the cathode diffusion layer 26. The second electrode frame has a second receiving hole, in which the anode diffusion layer 24 and the anode flow field 29 are located. The anode flow field 29 is located on the side of the anode diffusion layer 24 away from the diaphragm 23. In this embodiment, both the anode diffusion layer 24 and the anode flow field 29 are located in the second receiving hole, which can make full use of the second receiving hole, making the structure of the electrolytic gas generation assembly more compact and facilitating the miniaturization of the electrolytic cell 2. The second electrode frame is made of a high-pressure resistant polymer material, and the anode flow field 29 is made of a conductive and alkali-resistant corrosion-resistant material.

[0041] In one embodiment, please refer to Figure 1 and Figure 2 The first pole frame has a first receiving groove 254 on the side facing the first sealing gasket 211. The first receiving groove 254 is located on the outer periphery of the first receiving hole 251. A sealing ring (not shown in the figure) is provided in the first receiving groove 254. The sealing ring is sealed to the first pole frame and the first sealing gasket 211 respectively. The second pole frame has a second receiving groove 284 on the side facing the second sealing gasket 212. The second receiving groove 284 is located on the outer periphery of the second receiving hole. A sealing ring (not shown in the figure) is provided in the second receiving groove 284. The sealing ring is sealed to the second pole frame and the second sealing gasket 212 respectively.

[0042] In one embodiment, please refer to Figure 3The first pole frame has a first liquid inlet 252 and a first liquid outlet 253, and the second pole frame has a second liquid inlet 282 and a second liquid outlet 283. A turbulence structure 210 is provided at the first liquid inlet 252 and / or the second liquid inlet 282. In this embodiment, the electrolyte flows into the first inlet 252 on the first electrode frame and sequentially passes through the cathode flow field 27 and the cathode diffusion layer 26 before reaching the hydrogen evolution catalyst layer. A chemical reaction occurs at the hydrogen evolution catalyst layer to generate hydrogen gas. The generated hydrogen gas and the electrolyte entrained in it are discharged from the first outlet 253. The electrolyte also flows into the anode flow field 29 and the anode diffusion layer 24 through the second inlet 282 on the second electrode frame before reaching the oxygen evolution catalyst layer. A chemical reaction occurs at the oxygen evolution catalyst layer to generate oxygen gas. The generated oxygen gas and the electrolyte are discharged from the second outlet 283. A turbulence structure 210 is provided at the first inlet 252 and / or the second inlet 282. The turbulence structure 210 allows the electrolyte to disperse and buffer as it enters the first inlet 252 and / or the second inlet 282, ensuring a uniform flow to the hydrogen evolution catalyst layer and the oxygen evolution catalyst layer, thereby improving the gas production effect. In this embodiment, the shape of the turbulence structure 210 is not limited. The turbulence structure 210 can be an annular protrusion surrounding the first liquid inlet 252 and the second liquid inlet 282, or it can be a plurality of hemispherical protrusions dispersed around the outer periphery of the first liquid inlet 252 and the second liquid inlet 282.

[0043] In one embodiment, please refer to Figure 1 and Figure 4 The cathode flow field 27 is provided with a first flow guiding structure 271, which is connected to the first liquid inlet 252 and the first liquid outlet 253 respectively; the anode flow field 29 is provided with a second flow guiding structure 291, which is connected to the second liquid inlet 282 and the second liquid outlet 283 respectively. In this embodiment, the first flow guiding structure 271 and the second flow guiding structure 291 can guide the flow of electrolyte and gas, making the flow and dispersion of electrolyte and gas in the electrolytic gas generation component more uniform. In this embodiment, the shape of the first flow guiding structure 271 and the second flow guiding structure 291 is not limited, and the first flow guiding structure 271 and the second flow guiding structure 291 can be a straight tank, an S-shaped tank, or a U-shaped tank.

[0044] In one embodiment, please refer to Figure 1 and Figure 2The electrolysis gas generation assembly also includes a first sealing gasket 211 and a second sealing gasket 212. The first sealing gasket 211 is disposed between the cathode diffusion layer 26 and the diaphragm 23. A first through hole 2111 is formed in the middle of the first sealing gasket 211. The first sealing gasket 211 is in sealing contact with the periphery of the cathode diffusion layer 26 and the periphery of the diaphragm 23 respectively, preventing the generated hydrogen gas from leaking out from the edges of the cathode diffusion layer 26 and the diaphragm 23. At the same time, the first sealing gasket 211 is formed in the middle of the first through hole 2111, and at least part of the cathode diffusion layer 26 is connected to the diaphragm 23 through the first through hole 2111. The first sealing gasket 211 does not affect the mass transfer between the cathode diffusion layer 26 and the diaphragm 23 while sealing.

[0045] In one embodiment, please refer to Figure 1 and Figure 2 The second sealing gasket 212 is disposed between the anode diffusion layer 24 and the diaphragm 23. The second sealing gasket 212 has a second through hole 2121 in the middle. The second sealing gasket 212 is in sealing contact with the periphery of the anode diffusion layer 24 and the periphery of the diaphragm 23 respectively, preventing the generated oxygen from leaking out from the edges of the anode diffusion layer 24 and the diaphragm 23. At the same time, the second sealing gasket 212 has a second through hole 2121 in the middle, and at least part of the anode diffusion layer 24 is connected to the diaphragm 23 through the second through hole 2121. The second sealing gasket 212 does not affect the mass transfer between the anode diffusion layer 24 and the diaphragm 23 while sealing.

[0046] In one embodiment, please refer to Figure 1 and Figure 2 The electrolytic cell 2 also includes conductive partitions 213. The number of electrolytic gas generation components is at least two, and adjacent electrolytic gas generation components are isolated from each other by the conductive partitions 213. In this embodiment, the conductive partitions 213 isolate adjacent electrolytic gas generation components, allowing for individual voltage, current, and other performance tests on each component. In a specific embodiment, when a voltage test is required on a particular electrolytic gas generation component, the positive and negative terminals of a multimeter are electrically connected to the two adjacent conductive partitions 213, respectively. The voltage between the two adjacent conductive partitions 213 can then be measured using the multimeter. The conductive partitions 213 are made of conductive and alkali-resistant corrosion-resistant material.

[0047] In one embodiment, please refer to Figure 1 and Figure 2The electrolytic cell 2 also includes an anode current collector 214 and an anode insulating plate 215. The anode end plate 21, the anode insulating plate 215, and the anode current collector 214 are stacked sequentially. The anode current collector 214 is provided with a first wiring portion 2141, which is used for electrical connection with the power supply. In this embodiment, the wiring portion is located on the anode current collector 214, and an anode insulating plate 215 is provided between the anode end plate 21 and the anode current collector 214. The power supply and the anode end plate 21 are in an insulated state, and the current from the power supply is less likely to flow to the anode end plate 21, thereby improving the safety of the electrolytic cell 2. The anode end plate 21 and the anode current collector 214 are made of corrosion-resistant metallic conductive materials, and the anode insulating plate 215 is made of high-voltage resistant polymer materials.

[0048] In one embodiment, please refer to Figure 1 and Figure 2 The electrolytic cell 2 also includes a cathode current collector 216 and a cathode insulating plate 217. The cathode end plate 22, cathode insulating plate 217, and cathode current collector 216 are stacked sequentially. The cathode current collector 216 is provided with a second wiring portion 2161, which is used for electrical connection with the power supply. In this embodiment, the wiring portion is located on the cathode current collector 216, and a cathode insulating plate 217 is provided between the cathode end plate 22 and the cathode current collector 216. The power supply and the cathode end plate 22 are in an insulated state, and the current from the power supply is less likely to flow to the cathode end plate 22, thereby improving the safety of the electrolytic cell 2. The cathode end plate 22 and the cathode current collector 216 are made of corrosion-resistant metallic conductive materials, and the cathode insulating plate 217 is made of high-voltage resistant polymer materials.

[0049] In one embodiment, please refer to Figure 1 and Figure 2 The anode end plate 21, anode insulating plate 215 and anode current collector 214 are each provided with a first liquid inlet through hole (not shown in the figure) arranged opposite to each other. The first liquid inlet through hole is connected to the second liquid inlet 282 on the second pole frame. The anode end plate 21, anode insulating plate 215 and anode current collector 214 are also provided with a first liquid outlet through hole (not shown in the figure) arranged opposite to each other. The first liquid outlet through hole is connected to the second liquid outlet 283 on the second pole frame.

[0050] In one embodiment, please refer to Figure 1 and Figure 2The anode insulating plate 215 has a groove on the side facing the anode end plate 21, surrounding the first liquid inlet and first liquid outlet through holes of the anode insulating plate 215. A sealing element (not shown in the figure) is provided in the groove, sealingly contacting both the anode end plate 21 and the anode insulating plate 215 to prevent electrolyte from flowing out from the gap between them. The anode insulating plate 215 also has a groove on the side facing the anode current collector 214, surrounding the first liquid inlet and first liquid outlet through holes of the anode insulating plate 215. A sealing element (not shown in the figure) is provided in the groove, sealingly contacting both the anode insulating plate 215 and the anode current collector 214 to prevent electrolyte from flowing out from the gap between them.

[0051] In one embodiment, please refer to Figure 1 and Figure 2 Each of the cathode end plate 22, cathode insulating plate 217 and cathode current collector plate 216 is provided with a second liquid inlet through hole (not shown in the figure) arranged opposite to each other. The second liquid inlet through hole is connected to the first liquid inlet 252 on the first pole frame. The cathode end plate 22, cathode insulating plate 217 and cathode current collector plate 216 are also provided with a second liquid outlet through hole (not shown in the figure) arranged opposite to each other. The second liquid outlet through hole is connected to the first liquid outlet 253 on the first pole frame.

[0052] In one embodiment, please refer to Figure 1 and Figure 2 The cathode insulating plate 217 has a groove on the side facing the cathode end plate 22. The groove surrounds the second liquid inlet and second liquid outlet through holes of the cathode insulating plate 217. A sealing element (not shown in the figure) is provided in the groove, which makes sealing contact with both the cathode end plate 22 and the cathode insulating plate 217 to prevent electrolyte from flowing out from the gap between the cathode end plate 22 and the cathode insulating plate 217. The cathode insulating plate 217 also has a groove on the side facing the cathode current collector 216. The groove surrounds the second liquid inlet and second liquid outlet through holes of the cathode insulating plate 217. A sealing element (not shown in the figure) is provided in the groove, which makes sealing contact with both the cathode insulating plate 217 and the cathode current collector 216 to prevent electrolyte from flowing out from the gap between the cathode insulating plate 217 and the cathode current collector 216.

[0053] In one embodiment, please refer to Figure 1 and Figure 2The electrolytic cell 2 also includes a bolt 218 and a disc spring. The bolt 218 passes through the cathode end plate 22, cathode insulating plate 217, cathode current collector 216, electrolytic gas generation assembly, anode current collector 214, anode insulating plate 215 and anode end plate 21 in sequence to press and fix the cathode end plate 22, cathode insulating plate 217, cathode current collector 216, electrolytic gas generation assembly, anode current collector 214, anode insulating plate 215 and anode end plate 21. The disc spring is sleeved on the outer periphery of the bolt 218. The end of the bolt 218 that protrudes from the cathode end plate 22 has a nut. The disc spring is sandwiched between the nut and the cathode end plate 22. The disc spring plays a certain role in buffering and stabilizing when the electrolytic cell 2 is running at high pressure.

[0054] Secondly, embodiments of this application provide a hydrogen production system 100, including the electrolyzer 2 as described above.

[0055] In one embodiment, please refer to Figure 5 The hydrogen production system 100 also includes a liquid storage device 1 and a hydrogen gas-liquid separator 3. The liquid storage device 1 is connected to the electrolyzer 2 via a liquid supply pipeline 11 to supply electrolyte to the electrolyzer 2. The hydrogen gas-liquid separator 3 is connected to the electrolyzer 2 and the liquid storage device 1 via a first hydrogen exhaust pipeline 31 and a return water pipeline 32, respectively. Specifically, the electrolyte in the liquid storage device 1 can flow to the electrolyzer 2 through the liquid supply pipeline 11. The electrolyte passes through the first liquid inlet through hole of the anode plate 21 or the first liquid inlet through hole of the cathode plate 22. The electrolyte enters the electrolytic cell 2 through the second inlet through hole. The electrolytic cell 2 electrolyzes the water in the electrolyte to produce hydrogen and oxygen. The hydrogen, carrying a portion of the electrolyte, flows through the second outlet through hole and the first hydrogen exhaust pipe 31 to the hydrogen gas-liquid separator 3. After gas-liquid separation in the hydrogen gas-liquid separator 3, the electrolyte remains in the hydrogen gas-liquid separator 3. When the amount of electrolyte in the hydrogen gas-liquid separator 3 reaches a certain level, the electrolyte in the hydrogen gas-liquid separator 3 is discharged to the liquid storage device 1.

[0056] In one embodiment, reference Figure 5 The hydrogen production system 100 also includes a hydrogen receiving device 4 and a second hydrogen exhaust pipe 33. The hydrogen gas-liquid separator 3 is connected to the hydrogen receiving device 4 through the second hydrogen exhaust pipe 33. After the hydrogen and electrolyte are separated in the hydrogen gas-liquid separator 3, the hydrogen in the hydrogen gas-liquid separator 3 flows to the hydrogen receiving device 4 through the second hydrogen exhaust pipe 33.

[0057] In one embodiment, reference Figure 5The hydrogen production system 100 also includes a first oxygen exhaust pipe 12 and a second oxygen exhaust pipe 13. One end of the first oxygen exhaust pipe 12 is used to output oxygen, and the other end is connected to the liquid storage device 1. One end of the second oxygen exhaust pipe 13 is connected to the liquid storage device 1, and the other end is connected to the electrolyzer 2. Specifically, the oxygen generated in the electrolyzer 2 can flow to the liquid storage device 1 through the first liquid outlet through hole and the second oxygen exhaust pipe 13. After liquid-liquid separation in the liquid storage device 1, the oxygen is discharged to the oxygen collection device or the external atmosphere through the first oxygen exhaust pipe 12.

[0058] In one embodiment, reference Figure 5 A water pump 14 is installed on the liquid supply pipeline 11. The water pump 14 is used to transport the electrolyte in the liquid storage device 1 to the electrolytic cell 2. The water pump 14 is also used to transport the electrolyte in the electrolytic cell 2 back to the liquid storage device 1 via the second oxygen exhaust pipeline 13.

[0059] In one embodiment, reference Figure 5 The hydrogen production system 100 also includes a water supply device 5, which is connected to the liquid storage device 1 via a water supply pipe 51. Water in the water supply device 5 can flow to the liquid storage device 1 through the water supply pipe 51 to replenish the liquid storage device 1 and thereby control the ion concentration balance of the electrolyte in the liquid storage device 1.

[0060] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An electrolytic cell, characterized in that, include: An anode plate, a cathode plate, and an electrolysis gas generation assembly, wherein the electrolysis gas generation assembly is disposed between the anode plate and the cathode plate; The electrolytic gas generation assembly includes a diaphragm and an anode diffusion layer stacked sequentially. The compressive strength of the anode diffusion layer is greater than 3 MPa, and the anode diffusion layer abuts against the diaphragm to support the diaphragm.

2. The electrolytic cell according to claim 1, characterized in that, The compressive strength of the diaphragm is greater than 2.5 MPa. 。 3. The electrolytic cell according to claim 1 or 2, characterized in that, The electrolysis gas generation assembly also includes a first electrode frame, a cathode diffusion layer, and a cathode flow field; The first pole frame is located on the side of the diaphragm away from the anode diffusion layer; The first electrode frame has a first receiving hole, the cathode diffusion layer and the cathode flow field are located in the first receiving hole, and the cathode flow field is located on the side of the cathode diffusion layer away from the diaphragm.

4. The electrolytic cell according to claim 3, characterized in that, The electrolysis gas generation assembly also includes a second electrode frame and an anode flow field; The second pole frame is located on the side of the diaphragm away from the cathode diffusion layer; The second pole frame has a second receiving hole, and the anode diffusion layer and the anode flow field are located in the second receiving hole. The anode flow field is located on the side of the anode diffusion layer away from the diaphragm.

5. The electrolytic cell according to claim 4, characterized in that, The first pole frame has a first liquid inlet and a first liquid outlet, and the second pole frame has a second liquid inlet and a second liquid outlet. A turbulence structure is provided at the first liquid inlet and / or the second liquid inlet.

6. The electrolytic cell according to claim 5, characterized in that, The cathode flow field is provided with a first flow guiding structure, which is connected to the first liquid inlet and the first liquid outlet respectively; and / or The anode flow field is provided with a second flow guiding structure, which is connected to the second liquid inlet and the second liquid outlet respectively.

7. The electrolytic cell according to claim 3, characterized in that, The electrolysis gas generation assembly also includes a first sealing gasket and a second sealing gasket; The first sealing gasket is disposed between the cathode diffusion layer and the diaphragm. The first sealing gasket has a first through hole in the middle. The first sealing gasket is in sealing contact with the cathode diffusion layer and the diaphragm respectively. At least part of the cathode diffusion layer is in communication with the diaphragm through the first through hole. The second sealing gasket is disposed between the anode diffusion layer and the diaphragm. The second sealing gasket has a second through hole in the middle. The second sealing gasket is in sealing contact with the anode diffusion layer and the diaphragm respectively. At least part of the anode diffusion layer is connected to the diaphragm through the second through hole.

8. The electrolytic cell according to claim 1 or 2, characterized in that, The electrolytic cell also includes a conductive partition; The number of the electrolytic gas generation components is at least two, and adjacent electrolytic gas generation components are isolated from each other by the conductive partition.

9. The electrolytic cell according to claim 1 or 2, characterized in that, The electrolytic cell further includes an anode current collector and an anode insulating plate, wherein the anode end plate, the anode insulating plate, and the anode current collector are stacked sequentially. The anode current collector is provided with a first wiring portion for electrical connection to a power source; and / or The electrolytic cell also includes a cathode current collector and a cathode insulating plate. The cathode end plate, the cathode insulating plate and the cathode current collector are stacked in sequence. The cathode current collector is provided with a second wiring part, which is used for electrical connection with the power supply.

10. A hydrogen production system, characterized in that, Includes the electrolytic cell as described in any one of claims 1 to 9.

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