Water electrolysis hydrogen production device

Abstract

The invention discloses a water electrolysis hydrogen production device which comprises a first pole plate, a second pole plate, a pressing mechanism and a plurality of electrolytic bath units, the polarity of the first pole plate is opposite to that of the second pole plate, and the pressing mechanism comprises a first end plate, a second end plate, a connecting piece, an abutting plate and a plurality of driving pieces. The first end plate and the second end plate are arranged at intervals in the first direction and connected through a connecting piece, the first polar plate is arranged on the side, facing the second end plate, of the first end plate, the second polar plate is arranged on the side, facing the first end plate, of the second end plate, and a plurality of electrolytic cell units are arranged between the first polar plate and the second polar plate. An abutting plate is arranged between the first polar plate and the first end plate and / or between the second polar plate and the second end plate, a plurality of driving parts are arranged between the abutting plate and the end plates, and each driving part can independently push to enable the abutting plate to abut against the electrolytic cell unit, so that the abutting plate and the electrolytic cell unit can abut against each other and be attached to each other; the contact resistance between the abutting plate and the electrolytic cell unit is reduced, and the water electrolysis hydrogen production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic hydrogen production, and in particular to a water electrolytic hydrogen production device. Background Art

[0002] Since the product of hydrogen combustion is water, which is environmentally friendly, hydrogen is considered an ideal clean energy source. Currently, hydrogen production by water electrolysis is widely used as a low-cost hydrogen production method.

[0003] The electrolysis device of the prior art generally includes an anode bottom plate and a cathode bottom plate which are spaced relative to each other, and a bipolar plate arranged between the anode bottom plate and the cathode bottom plate, and a proton exchange membrane is also arranged between the anode bottom plate and the bipolar plate, and between the cathode bottom plate and the bipolar plate, and an electrolytic cell for electrolyzing water to produce hydrogen is formed between the anode plate and the bipolar plate, and between the cathode bottom plate and the bipolar plate. However, there is a gap between the anode plate and the bipolar plate, and between the cathode bottom plate and the bipolar plate, which increases the resistance, not only generates a large amount of working heat, but also easily causes power loss in hydrogen production, affecting the efficiency of hydrogen production from water in the battery. Summary of the invention

[0004] The object of the present invention is to provide a device for producing hydrogen by electrolyzing water, which has a simple structure, and its electrode plate and electrolytic cell unit are closely fitted, and the hydrogen production efficiency is high.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Provided is a water electrolysis hydrogen production device, comprising a first electrode plate, a second electrode plate, a clamping mechanism and a plurality of electrolyzer units, wherein the first electrode plate and the second electrode plate have opposite polarities, the clamping mechanism comprises a first end plate, a second end plate, a connecting member, a clamping plate and a plurality of driving members, the first end plate and the second end plate are spaced apart along a first direction and connected by the connecting member, the first electrode plate is arranged on the side of the first end plate facing the second end plate, the second electrode plate is arranged on the side of the second end plate facing the first end plate, a plurality of the electrolyzer units are arranged between the first electrode plate and the second electrode plate, the clamping plate is arranged between the first electrode plate and the first end plate and / or between the second electrode plate and the second end plate, a plurality of the driving members are arranged between the clamping plate and the end plate, and each of the driving members can be independently pushed to make the clamping plate press against the electrolyzer unit.

[0007] As a preferred solution of the hydrogen production device by electrolysis of water, the driving member includes a positioning rod, an elastic member and a plurality of gaskets. The positioning rod is arranged on the clamping plate, and the length of the positioning rod extends along the first direction. An avoidance hole is opened on the end plate, and one end of the positioning rod away from the clamping plate passes through the avoidance hole and is located outside the side of the end plate away from the clamping plate. The elastic member and the plurality of gaskets are sleeved outside the positioning rod and are located between the clamping plate and the end plate.

[0008] As a preferred solution of the hydrogen production device by water electrolysis, the positioning rod is provided with scale lines distributed along the first direction; and / or,

[0009] The number of the gaskets of at least some of the drive members is different; and / or,

[0010] The positioning rod is detachably connected to the clamping plate, the outer periphery of the positioning rod is provided with a first thread, the clamping plate is provided with a plurality of threaded holes with a second thread, the positioning rod is screwed and inserted into the threaded holes, and the first thread cooperates with the second thread.

[0011] As a preferred solution of the hydrogen production device by electrolysis of water, the electrolyzer unit includes a bipolar plate and a separator assembly, the bipolar plate is provided with a liquid inlet, a liquid outlet and a gas outlet along the first direction, the bipolar plate includes an anode side and a cathode side arranged opposite to each other along the first direction, the anode side is provided with an anode flow field area for accommodating an electrolyte, the anode flow field area is connected to the liquid inlet and the liquid outlet, the anode flow field area is spaced from the gas outlet, the cathode side is provided with a cathode flow field area, the cathode flow field area is connected to the gas outlet, the cathode flow field area, the liquid inlet and the liquid outlet are spaced, the separator assembly is provided between the bipolar plates and between two adjacent bipolar plates, the separator assembly includes a proton exchange membrane and a microporous titanium mesh stacked on both sides of the proton exchange membrane, and the proton exchange membrane can allow hydrogen ions to be electrolyzed to pass through.

[0012] As a preferred solution of the hydrogen production device by electrolysis of water, the bipolar plate is a circular bipolar plate, the lengths of the liquid inlet, the liquid outlet and the gas outlet all extend along the circumferential direction of the circular bipolar plate, the liquid inlet and the liquid outlet are spaced apart along the second direction, two gas outlets are provided, the two gas outlets are spaced apart along the third direction, and the first direction, the second direction and the third direction are arranged perpendicular to each other in pairs.

[0013] As a preferred solution of the water electrolysis hydrogen production device, the anode flow field area includes a plurality of anode flow field grooves, and the anode flow field grooves include a first liquid groove, two second liquid grooves, two third liquid grooves and two fourth liquid grooves, the lengths of the first liquid groove and the fourth liquid groove both extend along the second direction, and the two fourth liquid grooves are spaced apart and arranged on both sides of the first liquid groove along the second direction, one fourth liquid groove is connected to the liquid inlet, and the other fourth liquid groove is connected to the liquid outlet, the length of the second liquid groove extends along the third direction, and the two second liquid grooves are respectively connected to the two ends of the first liquid groove, the length of the third liquid groove extends along the circumferential direction of the circular bipolar plate, and the third liquid groove is used to connect the second liquid groove and the fourth liquid groove; and / or,

[0014] The cathode flow field area includes multiple cathode flow field grooves, and the cathode flow field grooves include a first gas groove, two second gas grooves, two third gas grooves and two fourth gas grooves. The lengths of the first gas groove and the fourth gas groove both extend along the third direction, and the two fourth gas grooves are spaced apart on both sides of the first gas groove along the third direction. The fourth gas groove is connected to the gas outlet, the length of the second gas groove extends along the second direction, and the two second gas grooves are respectively connected to the two ends of the first gas groove, the length of the third gas groove extends along the circumferential direction of the circular bipolar plate, one end of the third gas groove is connected to an end of the second gas groove away from the first gas groove, and the other end of the third gas groove is connected to an end of the fourth gas groove away from the gas outlet.

[0015] As a preferred solution of the electrolytic water hydrogen production device, at least part of the electrolytic cell units are extended electrolytic cell units, the extended electrolytic cell units include an extended electrode plate and a connecting pipe, the extended electrode plate is located between the two bipolar plates, the extended electrode plate includes a first side and a second side arranged opposite to each other along the first direction, the first side is provided with the anode flow field area, the first liquid inlet groove, the first liquid outlet groove and the first gas outlet groove, the anode flow field area on the first side is connected to the first liquid inlet groove and the first liquid outlet groove, the anode flow field area on the first side is spaced from the first gas outlet groove, and the first liquid inlet groove is connected to the liquid inlet of the bipolar plate between the first side and the first electrode plate, the first liquid outlet groove is connected to the liquid outlet of the bipolar plate between the first side and the first electrode plate, and the first gas outlet groove is connected to the gas outlet of the bipolar plate between the first side and the first electrode plate;

[0016] The second side is provided with the cathode flow field area, the second liquid inlet groove, the second liquid outlet groove and the second gas outlet groove, the first liquid inlet groove is spaced from the second liquid inlet groove, the first liquid outlet groove is spaced from the second liquid outlet groove, the first gas outlet groove is spaced from the second gas outlet groove, the cathode flow field area on the second side is connected to the second gas outlet groove, the cathode flow field area on the second side is spaced from the second liquid inlet groove and the second liquid outlet groove, and the second liquid inlet groove is connected to the liquid inlet of the bipolar plate between the second side and the second electrode plate, the second liquid outlet groove is connected to the liquid outlet of the bipolar plate between the second side and the second electrode plate, the second gas outlet groove is connected to the gas outlet of the bipolar plate between the second side and the second electrode plate, the liquid inlet groove is connected to the external liquid infusion mechanism through the connecting pipe, the liquid outlet groove is connected to the external liquid storage mechanism through the connecting pipe, and the gas outlet groove is connected to the external gas storage mechanism through the connecting pipe.

[0017] As a preferred solution of the device for producing hydrogen by electrolysis of water, the connecting tube is detachably connected to the extended electrode plate, and a first sealing gasket and a first insulating gasket are provided between the connecting tube and the extended electrode plate.

[0018] As a preferred solution of the hydrogen production device by electrolysis of water, a positioning groove is recessed on the bipolar plate, and the separation component further includes a positioning key, which is used to press part of the microporous titanium mesh into the positioning groove; and / or,

[0019] The separation assembly further includes a second sealing gasket, and the second sealing gasket is disposed between two adjacent bipolar plates.

[0020] As a preferred solution of the device for producing hydrogen by electrolysis of water, the device for producing hydrogen by electrolysis of water further includes a second insulating pad, and the second insulating pad is provided between the first electrode plate and the first end plate, and between the second electrode plate and the second end plate.

[0021] The beneficial effects of the present invention are as follows: by utilizing the driving member to drive the clamping plate, the clamping plate and the electrolyzer unit can be tightly fitted, thereby reducing the contact resistance between the clamping plate and the electrolyzer unit, thereby reducing the heat generation and power consumption during the electrolysis process, ensuring good contact and sealing between the clamping plate and the electrolyzer, and improving the efficiency of hydrogen production by electrolyzing water; by independently driving each driving member, the clamping plate and the electrolyzer unit can be more evenly fitted at each force point on the abutting surface, thereby reducing the local overheating caused by uneven distribution of local clamping force and the unbalanced hydrogen production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0023] Figure 1It is a structural schematic diagram of a water electrolysis hydrogen production device according to an embodiment of the present invention;

[0024] Figure 2 is a cross-sectional view of a water electrolysis hydrogen production device according to an embodiment of the present invention;

[0025] Figure 3 yes Figure 2 An enlarged schematic diagram of point A;

[0026] Figure 4 It is a schematic diagram of an explosion of a water electrolysis hydrogen production device according to an embodiment of the present invention;

[0027] Figure 5 is a schematic structural diagram of an electrolytic cell unit according to an embodiment of the present invention;

[0028] Figure 6 The structure of the bipolar plate of one embodiment of the present invention is shown in FIG. Figure 1 ;

[0029] Figure 7 The structure of the bipolar plate of one embodiment of the present invention is shown in FIG. Figure 2 ;

[0030] Figure 8 is a structural schematic diagram of a water electrolysis hydrogen production device according to another embodiment of the present invention;

[0031] Fig. 9 is a schematic diagram of the cooperation between the expansion plate and the connecting tube according to another embodiment of the present invention;

[0032] Fig.10 It is a schematic structural diagram of an extended electrode plate according to another embodiment of the present invention.

[0033] In the figure:

[0034] 1. First electrode plate; 2. Second electrode plate; 3. Clamping mechanism; 31. First end plate; 32. Second end plate; 33. Connector; 34. Clamping plate; 35. Driving member; 351. Positioning rod; 3511. Scale line; 352. Elastic member; 353. Gasket; 4. Electrolyzer unit; 41. Bipolar plate; 411. Liquid inlet; 412. Liquid outlet; 413. Gas outlet; 414. Anode side; 415. Cathode side; 416. Anode flow field region; 417. Cathode flow field region; 418. Positioning groove; 42. Separation assembly; 421. Proton exchange membrane; 422. Microporous titanium mesh; 423. Positioning key; 424. The second sealing gasket; 43, anode flow field slot; 431, first liquid slot; 432, second liquid slot; 433, third liquid slot; 434, fourth liquid slot; 44, cathode flow field slot; 441, first gas slot; 442, second gas slot; 443, third gas slot; 444, fourth gas slot; 45, extended plate; 451, first side; 452, first liquid inlet slot; 453, first liquid outlet slot; 454, first gas outlet slot; 455, second side; 456, second liquid inlet slot; 457, second liquid outlet slot; 458, second gas outlet slot; 46, connecting pipe; 47, first sealing gasket; 48, first insulating pad; 5, second insulating pad. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] like Figures 1 to 10 As shown, the electrolytic water hydrogen production device of the embodiment of the present invention includes a first electrode plate 1, a second electrode plate 2, a clamping mechanism 3 and a plurality of electrolytic cell units 4, the first electrode plate 1 and the second electrode plate 2 have opposite polarities, the clamping mechanism 3 includes a first end plate 31, a second end plate 32, a connecting member 33, a clamping plate 34 and a plurality of driving members 35, the first end plate 31 and the second end plate 32 are spaced apart along a first direction and connected by a connecting member 33 (the first direction is the X direction shown in the figure, i.e., the vertical direction), the first electrode plate 1 It is arranged on the side of the first end plate 31 facing the second end plate 32, the second electrode plate 2 is arranged on the side of the second end plate 32 facing the first end plate 31, a plurality of electrolytic cell units 4 are arranged between the first electrode plate 1 and the second electrode plate 2, a clamping plate 34 is arranged between the first electrode plate 1 and the first end plate 31 and / or between the second electrode plate 2 and the second end plate 32, a plurality of driving members 35 are arranged between the clamping plate 34 and the end plate, and each driving member 35 can be independently pushed to make the clamping plate 34 and the electrolytic cell unit 4 clamped.

[0040] It can be understood that by utilizing the driving member 35 to drive the clamping plate 34, the clamping plate 34 and the electrolyzer unit 4 can be tightly fitted, thereby reducing the contact resistance between the clamping plate 34 and the electrolyzer unit 4, thereby reducing the heat generation and power consumption during the electrolysis process, ensuring good contact and sealing between the clamping plate 34 and the electrolyzer, and improving the efficiency of hydrogen production by electrolysis of water; each driving member 35 is driven independently to make the clamping plate 34 and the electrolyzer unit 4 The various force points on the abutting surface fit more evenly, thereby reducing local overheating caused by uneven distribution of local clamping force and causing unbalanced hydrogen production.

[0041] For example, the first electrode plate 1 is fitted with the first end plate 31, and a plurality of driving members 35 are arranged between the second electrode plate 2 and the second end plate 32. When the connecting member 33 ensures that the relative position of the first end plate 31 and the second end plate 32 is stable, the second end plate 32 is moved toward the electrolytic cell unit 4 by the driving member 35, and the electrolytic cell unit 4 is pressed against the first electrode plate 1, and the electrolytic cell unit 4 is pressed against the second electrode plate 2. Of course, a plurality of driving members 35 can also be arranged between the first electrode plate 1 and the first end plate 31, and the second electrode plate 2 is fitted with the second end plate 32. In addition, a plurality of driving members 35 can also be arranged between the first electrode plate 1 and the first end plate 31, and a plurality of driving members 35 can also be arranged between the second electrode plate 2 and the second end plate 32.

[0042] Furthermore, if Figure 2 , Figure 3 and Figure 4 As shown, the driving member 35 includes a positioning rod 351, an elastic member 352 and a plurality of gaskets 353. The positioning rod 351 is arranged on the abutting plate 34, and the length of the positioning rod 351 extends along the first direction. An avoidance hole is provided on the end plate. One end of the positioning rod 351 away from the abutting plate 34 passes through the avoidance hole and is located outside the side of the end plate away from the abutting plate 34. The elastic member 352 and the plurality of gaskets 353 are sleeved outside the positioning rod 351 and are located between the abutting plate 34 and the end plate. The positioning rod 351 restricts the elastic member 352 and the gasket 353, effectively ensuring the direction of the elastic force of the elastic member 352, thereby ensuring the overall force direction of the driving member 35.

[0043] It should be noted that the elastic member 352 always has a tendency to drive the abutting plate 34 in the first direction, that is, the elastic member 352 can not only drive the abutting plate 34 to abut against the electrolyzer unit 4 in the initial assembly state of the water electrolysis hydrogen production device, but also compensate for the expansion deformation caused by the temperature rise during the use of the water electrolysis hydrogen production device, maintain the dynamic load balance of the water electrolysis hydrogen production device in the first direction, and ensure the sealing between the electrolyzer units 4 and between the electrolyzer units 4 and the abutting plate 34. In addition, the driving member 35 composed of the elastic member 352 and the gasket 353 has a simple structure, is a standard part in the market, and has a low production cost. Of course, the driving member 35 can also adopt a linear drive mechanism such as a cylinder, an oil cylinder, an electric cylinder, etc.

[0044] Furthermore, the positioning rods 351 are provided with scale lines 3511 distributed along the first direction. By visually observing the scale lines 3511 of the positioning rods 351 exposed outside the avoidance holes, the extended length difference of each positioning rod 351 is determined to perform drive compensation at each positioning rod 351.

[0045] Optionally, at least some of the driving members 35 have different numbers of gaskets 353. In other words, the driving force is adjusted by stacking different numbers of gaskets 353 so that the pressing force at each point of the pressing plate 34 is balanced, that is, by observing the exposed length of the positioning rods 351, the number of gaskets 353 is adjusted so that the exposed lengths of the positioning rods 351 are consistent.

[0046] In addition, the positioning rod 351 is detachably connected to the abutting plate 34, the outer periphery of the positioning rod 351 is provided with a first thread, the abutting plate 34 is provided with a plurality of threaded holes with a second thread, the positioning rod 351 is screwed and inserted into the threaded hole, and the first thread cooperates with the second thread. By detachably connecting the positioning rod 351 to the abutting plate 34, the production of the abutting plate 34 and the positioning rod 351 is facilitated, and the threaded connection is stable and convenient for assembly and disassembly. In actual application, the positioning rod 351 is installed on the abutting plate 34, and then the gasket 353 and the spring are sleeved on the positioning rod 351, and then the end plate and the positioning rod 351 are accurately positioned and pressed against the abutting plate 34.

[0047] In some embodiments, Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the electrolytic cell unit 4 includes a bipolar plate 41 and a separator assembly 42. The bipolar plate 41 is provided with a liquid inlet 411, a liquid outlet 412 and a gas outlet 413 along a first direction. The bipolar plate 41 includes an anode side 414 and a cathode side 415 which are arranged opposite to each other along the first direction. The anode side 414 is provided with an anode flow field area 416 for accommodating an electrolyte. The anode flow field area 416 is connected to the liquid inlet 411 and the liquid outlet 412. The anode flow field area 416 is spaced from the gas outlet 413, that is, the fluid enters the anode flow field area 416 from the liquid inlet 411. The fluid in the anode flow field area 416 is discharged through the liquid outlet 412 to realize the circulation of the fluid; the cathode side 415 is provided with a cathode flow field area 417, the cathode flow field area 417 is connected to the gas outlet 413, the cathode flow field area 417, the liquid inlet 411 and the liquid outlet 412 are arranged at intervals, and a separator assembly 42 is arranged between the bipolar plate 41 and the plate, and between two adjacent bipolar plates 41, and the separator assembly 42 includes a proton exchange membrane 421 and a microporous titanium mesh 422 stacked on both sides of the proton exchange membrane 421, and the proton exchange membrane 421 can allow the hydrogen ions of electrolysis to pass through. It should be noted that the anode flow field area 416 is not connected to the cathode flow field area 417 to prevent moisture from entering the cathode flow field area 417 and affecting the production of hydrogen.

[0048] In actual use, the first electrode plate 1 and the second electrode plate 2 are energized, and pure water is input into the liquid inlet 411. Part of the pure water is electrolyzed into oxygen and hydrogen ions in the anode flow field area 416, and the oxygen and the remaining pure water are discharged from the liquid outlet 412, while the hydrogen ions can pass through the microporous titanium mesh 422 for separation, and then obtain electrons in the cathode flow field area 417 through the proton exchange membrane 421 to form hydrogen. The hydrogen in the cathode flow field area 417 is discharged from the gas outlet 413.

[0049] Furthermore, the bipolar plate 41 is a circular bipolar plate 41, and the lengths of the liquid inlet 411, the liquid outlet 412, and the gas outlet 413 all extend along the circumference direction of the circular bipolar plate 41, ensuring that each connection port is fully spaced while effectively extending the length of each connection port, and the length of each connection port extends along the circumference direction, and the casting is smooth. The liquid inlet 411 and the liquid outlet 412 are spaced apart along the second direction (the second direction is the Y direction shown in the figure), and there are two gas outlets 413, and the two gas outlets 413 are spaced apart along the third direction (the third direction is the Z direction shown in the figure), which effectively ensures the discharge efficiency of hydrogen and reduces the residence of hydrogen in the cathode flow field area 417, thereby ensuring the production efficiency of hydrogen production by electrolysis of water. The first direction, the second direction, and the third direction are arranged perpendicular to each other. The circular bipolar plate 41 structure has a high proportion of use, and each connector 33 is evenly distributed around the circumference of the circular plate, and the balanced force can ensure the consistency of swelling of the proton exchange membrane 421 in all directions.

[0050] Furthermore, the anode flow field region 416 includes a plurality of anode flow field grooves 43, the anode flow field grooves 43 include a first liquid groove 431, two second liquid grooves 432, two third liquid grooves 433 and two fourth liquid grooves 434, the lengths of the first liquid groove 431 and the fourth liquid groove 434 both extend along the second direction, and the two fourth liquid grooves 434 are spaced apart on both sides of the first liquid groove 431 along the second direction, one fourth liquid groove 434 is connected to the liquid inlet 411, and the other fourth liquid groove 434 is connected to the liquid outlet 412, the length of the second liquid groove 432 extends along the third direction, and the two second liquid grooves 432 are respectively connected to both ends of the first liquid groove 431, the length of the third liquid groove 433 extends along the circumferential direction of the circular bipolar plate 41, and the third liquid groove 433 is used to connect the second liquid groove 432 and the fourth liquid groove 434. This structural setting can make the pure water more evenly distributed in each anode flow field slot 43, reduce the situation of high local voltage and high heat generation caused by uneven distribution of pure water, and improve the electrolysis efficiency of pure water in the anode flow field area 416. And the edge structure between each anode flow field slot 43 supports the proton exchange membrane 421, reducing the situation of the proton exchange membrane 421 being squeezed into the anode flow field slot 43.

[0051] In addition, multiple flow field grooves arranged at intervals can prevent some fluids in the anode flow field groove 43 from rotating in the local space and being difficult to discharge, thereby improving the orderliness of the fluid flow. And through the discharge of pure water and oxygen, it can also take away some of the heat generated during the operation of the electrolytic cell unit 4, thereby improving the heat dissipation efficiency of the bipolar plate 41. The liquid groove extending in the second direction is connected with the liquid inlet 411 and the liquid outlet 412 to ensure the consistency of the fluid input and discharge directions, and the length of the third liquid groove 433 is extended along the circumferential direction of the circular bipolar plate 41, which can effectively improve the coordination of the fluid connection between the fourth liquid groove 434 and the second liquid groove 432, so that the flow of the fluid is smoother.

[0052] Optionally, the cathode flow field region 417 includes a plurality of cathode flow field grooves 44, the cathode flow field grooves 44 include a first gas groove 441, two second gas grooves 442, two third gas grooves 443 and two fourth gas grooves 444, the lengths of the first gas groove 441 and the fourth gas groove 444 both extend along the third direction, and the two fourth gas grooves 444 are spaced apart on both sides of the first gas groove 441 along the third direction, the fourth gas groove 444 is connected to the gas outlet 413, the length of the second gas groove 442 extends along the second direction, and the two second gas grooves 442 are respectively connected to both ends of the first gas groove 441, the length of the third gas groove 443 extends along the circumferential direction of the circular bipolar plate 41, one end of the third gas groove 443 is connected to an end of the second gas groove 442 away from the first gas groove 441, and the other end of the third gas groove 443 is connected to an end of the fourth gas groove 444 away from the gas outlet 413. It can be understood that the overall flow direction of the gas is along the third direction, and the overall flow direction of the liquid is along the second direction, that is, the layout of the cathode flow field slot 44 is consistent with that of the anode flow field slot 43, but the flow direction is set vertically, ensuring the independence of the fluid outflow and gas outflow of the bipolar plate 41, without affecting each other, and the support between the two bipolar plates 41 is better, reducing the deformation of the bipolar plate 41. Preferably, the surface of the bipolar plate 41 can also be platinum-plated, which can better reduce the resistance of the overall water electrolyzer.

[0053] In other embodiments, the device liquid input port, device liquid output port and device liquid discharge port of the entire water electrolysis hydrogen production device are arranged on both sides of the water electrolysis hydrogen production device along the first direction. When there are many electrolytic cell units 4 stacked along the water electrolysis hydrogen production device, the electrolytic cell units 4 far away from the device liquid input port, device liquid output port and device liquid discharge port have insufficient flow power and low electrolysis efficiency.

[0054] Based on this, Figure 8 , Fig. 9 and Fig.10As shown, at least part of the electrolytic cell unit 4 is an extended electrolytic cell unit 4, and the extended electrolytic cell unit 4 includes an extended electrode plate 45 and a connecting pipe 46. The extended electrode plate 45 is located between the two bipolar plates 41, and the extended electrode plate 45 includes a first side 451 and a second side 455 arranged opposite to each other along a first direction. The first side 451 is provided with an anode flow field area 416, a first liquid inlet groove 452, a first liquid outlet groove 453 and a first gas outlet groove 454 at intervals, and the anode flow field area 416 of the first side 451 is connected to the first inlet groove 454. The liquid tank 452 and the first liquid outlet tank 453, the anode flow field area 416 of the first side 451 is separated from the first gas outlet tank 454, and the first liquid inlet tank 452 is connected to the liquid inlet 411 of the bipolar plate 41 between the first side 451 and the first electrode plate 1, the first liquid outlet tank 453 is connected to the liquid outlet 412 of the bipolar plate 41 between the first side 451 and the first electrode plate 1, and the first gas outlet tank 454 is connected to the gas outlet 413 of the bipolar plate 41 between the first side 451 and the first electrode plate 1.

[0055] In addition, the second side 455 is spaced apart with a cathode flow field region 417, a second liquid inlet groove 456, a second liquid outlet groove 457 and a second gas outlet groove 458, the first liquid inlet groove 452 is spaced apart from the second liquid inlet groove 456, the first liquid outlet groove 453 is spaced apart from the second liquid outlet groove 457, the first gas outlet groove 454 is spaced apart from the second gas outlet groove 458, the cathode flow field region 417 of the second side 455 is connected to the second gas outlet groove 458, the cathode flow field region 417 of the second side 455 is spaced apart from the second liquid inlet groove 456 and the second liquid outlet groove 457, and the second inlet groove 452 is spaced apart from the second liquid inlet groove 456, the first liquid outlet groove 453 is spaced apart from the second liquid outlet groove 457, the first gas outlet groove 454 is spaced apart from the second gas outlet groove 458 The liquid tank 456 is connected to the liquid inlet 411 of the bipolar plate 41 between the second side 455 and the second electrode plate 2, the second liquid outlet tank 457 is connected to the liquid outlet 412 of the bipolar plate 41 between the second side 455 and the second electrode plate 2, the second gas outlet tank 458 is connected to the gas outlet 413 of the bipolar plate 41 between the second side 455 and the second electrode plate 2, the liquid inlet tank is connected to the external liquid infusion mechanism through the connecting tube 46, the liquid outlet tank is connected to the external liquid storage mechanism through the connecting tube 46, and the gas outlet tank is connected to the external gas storage mechanism through the connecting tube 46.

[0056] Obviously, in this embodiment, the first electrode is a cathode electrode, and the second electrode is an anode electrode. By using the setting of the expansion plate 45, the bipolar plate 41 between the expansion plate 45 and the cathode electrode and the bipolar plate 41 between the expansion plate 45 and the anode plate are separated under the condition that the conductivity between each bipolar plate 41 and the expansion plate 45 is good and the electric field is stable, so that the fluid introduction and the fluid and hydrogen export on both sides of the expansion plate 45 are independent of each other, and the flow distance of the fluid introduction and the fluid and hydrogen export of the whole water electrolysis hydrogen production device is reduced, so as to ensure the efficiency of the fluid and gas flow in each bipolar plate 41, so as to ensure the hydrogen production efficiency of each electrolyzer unit 4. And the setting of the overall fluid inflow and outflow of the water electrolysis hydrogen production device can be expanded by the expansion plate 45, which can improve the heat dissipation efficiency of the middle position of the water electrolysis hydrogen production device, thereby reducing the influence of heat on the hydrogen production efficiency of the water electrolysis hydrogen production device.

[0057] Furthermore, if Fig. 9 As shown, the connecting tube 46 is detachably connected to the expansion electrode plate 45, which is convenient for the production of the connecting tube 46 and the expansion electrode plate 45, and the two have simple structures, convenient disassembly and assembly, and low later maintenance costs. Specifically, taking the first liquid inlet tank 452 as an example, the outer peripheral side of the expansion electrode plate 45 is provided with an expansion liquid inlet communicated with the first liquid inlet tank 452, and a threaded hole is provided on the peripheral side of the expansion liquid inlet, and a through hole is provided on the flange of the connecting tube 46, and an insulating bolt is used to pass through the through hole and screw into the threaded hole to realize the detachable connection between the connecting tube 46 and the expansion electrode plate 45. A first sealing gasket 47 and a first insulating gasket 48 are provided between the connecting tube 46 and the expansion electrode plate 45. The first sealing gasket 47 is provided to ensure the sealing of the connection between the connecting tube 46 and the expansion electrode plate 45, and reduce the occurrence of leakage. Since the expansion electrode plate 45 is charged, the first insulating gasket 48 can improve the insulation of the connecting tube 46, and reduce the situation that the operator is electrocuted or the connecting tube 46 is conductive to the external device and short-circuited.

[0058] Alternatively, if Figure 4 and Figure 5 As shown, a positioning groove 418 is recessed on the bipolar plate 41, and the separator assembly 42 further includes a positioning key 423, which is used to press a portion of the microporous titanium mesh 422 into the positioning groove 418. The positioning key 423 is used to fix the edge of the microporous titanium mesh 422 so that the microporous titanium mesh 422 remains in a stretched state during use, thereby ensuring smooth flow of hydrogen ions.

[0059] In addition, the separator assembly 42 also includes a second sealing gasket 424, which is arranged between two adjacent bipolar plates 41. By setting the second sealing gasket 424, the sealing between the two adjacent bipolar plates 41 can be ensured, and the occurrence of leakage can be reduced. In addition, a second sealing gasket 424 is also arranged between the bipolar plate 41 and the anode plate and the cathode plate. Preferably, a limiting groove for placing the second sealing gasket 424 is arranged on the bipolar plate 41. The limiting groove limits the second sealing gasket 424, thereby reducing the occurrence of the second sealing gasket 424 being squeezed and displaced, ensuring the stability of the use position of the second sealing gasket 424, thereby ensuring the stability of the sealing effect of the second sealing gasket 424. Specifically, the limiting groove and the second sealing gasket 424 are annularly arranged on the outer periphery of the liquid outlet 412, the liquid outlet 412 and the gas outlet 413 to ensure the sealing of each connection port.

[0060] Furthermore, the water electrolysis hydrogen production device further includes a second insulating pad 5, and the second insulating pad 5 is provided between the first electrode plate 1 and the first end plate 31, and between the second electrode plate 2 and the second end plate 32, to ensure the insulation of the first end plate 31 and the second end plate 32, reduce the occurrence of electric shock to operators, and improve the safety of the water electrolysis hydrogen production device. The connector 33 may include but is not limited to screws, bolts, and a combination of bolts and nuts, so that the first electrode plate 1, the second electrode plate 2, the electrolyzer unit 4, and the separator assembly 42 are integrally pressed and fixed between the two end plates.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hydrogen production device by electrolysis of water, characterized in that: It includes a first pole plate, a second pole plate, a clamping mechanism and a plurality of electrolytic cell units, the first pole plate and the second pole plate have opposite polarities, the clamping mechanism includes a first end plate, a second end plate, a connecting member, a clamping plate and a plurality of driving members, the first end plate and the second end plate are spaced apart along a first direction and connected by the connecting member, the first pole plate is arranged on the side of the first end plate facing the second end plate, the second pole plate is arranged on the side of the second end plate facing the first end plate, a plurality of the electrolytic cell units are arranged between the first pole plate and the second pole plate, the clamping plate is arranged between the first pole plate and the first end plate and / or between the second pole plate and the second end plate, a plurality of the driving members are arranged between the clamping plate and the end plate, each of the driving members can be independently pushed to make the clamping plate press against the electrolytic cell unit.

2. The water electrolysis hydrogen production device according to claim 1, characterized in that: The driving member includes a positioning rod, an elastic member and a plurality of gaskets. The positioning rod is arranged on the clamping plate, and the length of the positioning rod extends along the first direction. An avoidance hole is opened on the end plate. One end of the positioning rod away from the clamping plate passes through the avoidance hole and is located outside the side of the end plate away from the clamping plate. The elastic member and the plurality of gaskets are sleeved outside the positioning rod and are located between the clamping plate and the end plate.

3. The water electrolysis hydrogen production device according to claim 2, characterized in that: The positioning rod is provided with scale lines distributed along the first direction; and / or, The number of the gaskets of at least some of the drive members is different; and / or, The positioning rod is detachably connected to the clamping plate, the outer periphery of the positioning rod is provided with a first thread, the clamping plate is provided with a plurality of threaded holes with a second thread, the positioning rod is screwed and inserted into the threaded holes, and the first thread cooperates with the second thread.

4. The water electrolysis hydrogen production device according to any one of claims 1 to 3, characterized in that: The electrolytic cell unit includes a bipolar plate and a separator assembly, wherein the bipolar plate is provided with a liquid inlet, a liquid outlet and a gas outlet along the first direction, the bipolar plate includes an anode side and a cathode side arranged opposite to each other along the first direction, the anode side is provided with an anode flow field area for accommodating an electrolyte, the anode flow field area is connected to the liquid inlet and the liquid outlet, the anode flow field area is spaced from the gas outlet, the cathode side is provided with a cathode flow field area, the cathode flow field area is connected to the gas outlet, the cathode flow field area, the liquid inlet and the liquid outlet are spaced, the separator assembly is provided between the bipolar plates and between two adjacent bipolar plates, the separator assembly includes a proton exchange membrane and a microporous titanium mesh stacked on both sides of the proton exchange membrane, the proton exchange membrane can allow hydrogen ions to be electrolyzed to pass through.

5. The water electrolysis hydrogen production device according to claim 4, characterized in that: The bipolar plate is a circular bipolar plate, the lengths of the liquid inlet, the liquid outlet and the gas outlet all extend along the circumferential direction of the circular bipolar plate, the liquid inlet and the liquid outlet are spaced apart along the second direction, two gas outlets are provided, the two gas outlets are spaced apart along the third direction, and the first direction, the second direction and the third direction are arranged perpendicular to each other.

6. The water electrolysis hydrogen production device according to claim 5, characterized in that: The anode flow field region includes a plurality of anode flow field grooves, and the anode flow field grooves include a first liquid groove, two second liquid grooves, two third liquid grooves and two fourth liquid grooves, the lengths of the first liquid groove and the fourth liquid groove both extend along the second direction, and the two fourth liquid grooves are spaced apart and arranged on both sides of the first liquid groove along the second direction, one fourth liquid groove is connected to the liquid inlet, and the other fourth liquid groove is connected to the liquid outlet, the length of the second liquid groove extends along the third direction, and the two second liquid grooves are respectively connected to both ends of the first liquid groove, the length of the third liquid groove extends along the circumferential direction of the circular bipolar plate, and the third liquid groove is used to connect the second liquid groove and the fourth liquid groove; and / or, The cathode flow field area includes multiple cathode flow field grooves, and the cathode flow field grooves include a first gas groove, two second gas grooves, two third gas grooves and two fourth gas grooves. The lengths of the first gas groove and the fourth gas groove both extend along the third direction, and the two fourth gas grooves are spaced apart on both sides of the first gas groove along the third direction. The fourth gas groove is connected to the gas outlet, the length of the second gas groove extends along the second direction, and the two second gas grooves are respectively connected to the two ends of the first gas groove, the length of the third gas groove extends along the circumferential direction of the circular bipolar plate, one end of the third gas groove is connected to an end of the second gas groove away from the first gas groove, and the other end of the third gas groove is connected to an end of the fourth gas groove away from the gas outlet.

7. The water electrolysis hydrogen production device according to claim 4, characterized in that: At least part of the electrolytic cell units are extended electrolytic cell units, the extended electrolytic cell units include an extended electrode plate and a connecting pipe, the extended electrode plate is located between the two bipolar plates, the extended electrode plate includes a first side and a second side arranged opposite to each other along the first direction, the first side is provided with the anode flow field area, a first liquid inlet slot, a first liquid outlet slot and a first gas outlet slot at intervals, the anode flow field area on the first side is connected to the first liquid inlet slot and the first liquid outlet slot, the anode flow field area on the first side is spaced from the first gas outlet slot, and the first liquid inlet slot is connected to the liquid inlet of the bipolar plate between the first side and the first electrode plate, the first liquid outlet slot is connected to the liquid outlet of the bipolar plate between the first side and the first electrode plate, and the first gas outlet slot is connected to the gas outlet of the bipolar plate between the first side and the first electrode plate; The second side is provided with the cathode flow field area, the second liquid inlet groove, the second liquid outlet groove and the second gas outlet groove, the first liquid inlet groove is spaced from the second liquid inlet groove, the first liquid outlet groove is spaced from the second liquid outlet groove, the first gas outlet groove is spaced from the second gas outlet groove, the cathode flow field area on the second side is connected to the second gas outlet groove, the cathode flow field area on the second side is spaced from the second liquid inlet groove and the second liquid outlet groove, and the second liquid inlet groove is connected to the liquid inlet of the bipolar plate between the second side and the second electrode plate, the second liquid outlet groove is connected to the liquid outlet of the bipolar plate between the second side and the second electrode plate, the second gas outlet groove is connected to the gas outlet of the bipolar plate between the second side and the second electrode plate, the liquid inlet groove is connected to the external liquid infusion mechanism through the connecting pipe, the liquid outlet groove is connected to the external liquid storage mechanism through the connecting pipe, and the gas outlet groove is connected to the external gas storage mechanism through the connecting pipe.

8. The water electrolysis hydrogen production device according to claim 7, characterized in that: The connecting tube is detachably connected to the extended pole plate, and a first sealing pad and a first insulating pad are arranged between the connecting tube and the extended pole plate.

9. The water electrolysis hydrogen production device according to claim 4, characterized in that: The bipolar plate is provided with a recessed positioning groove, and the separation assembly further comprises a positioning key, and the positioning key is used to press a part of the microporous titanium mesh into the positioning groove; and / or, The separation assembly further includes a second sealing gasket, and the second sealing gasket is disposed between two adjacent bipolar plates.

10. The water electrolysis hydrogen production device according to any one of claims 1 to 3, characterized in that: It also includes a second insulating pad, which is disposed between the first electrode plate and the first end plate and between the second electrode plate and the second end plate.

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