Proton membrane electrolysis water hydrogen production electrolysis unit and electrolysis device

Abstract

The invention discloses an electrolysis unit and an electrolysis device for hydrogen production through water electrolysis of a proton membrane, and belongs to the field of polymer ion membrane water electrolysis. The electrolysis unit is divided into a supporting part and a membrane sealing part, and an outer ring is of a supporting structure and comprises a negative metal pole plate, an insulating supporting plate and a positive metal pole plate; the inner core comprises an upper gas diffusion layer, a proton membrane, a lower gas diffusion layer, an upper membrane sealing ring and a lower membrane sealing ring, the upper membrane sealing ring and the lower membrane sealing ring clamp the proton membrane under the pressing action of the negative electrode metal polar plate and the positive electrode metal polar plate, and an electrolysis chamber is formed between the upper membrane sealing ring and the lower membrane sealing ring. The sealing piece of the electrolysis chamber in the electrolysis device does not participate in control over the thickness size of the electrolysis unit, the size tolerance of the electrolysis unit is easy and stable to control, and the performance of the electrolysis device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer ion membrane water electrolysis, and in particular to a proton membrane water electrolysis hydrogen production electrolysis unit and an electrolysis device. Background Art

[0002] The application scale of proton membrane electrolysis of water to produce hydrogen is getting larger and larger, and the power requirements for electrolyzers are getting higher and higher. The materials of the components of the electrolyzer are relatively thin. For example, the thickness of the proton membrane of the electrolyzer is usually 0.185mm; the electrolyzer is composed of hundreds of electrolysis units stacked together. After assembly, the contact resistance between the entire proton membrane surface and the electrolysis plate is required to be small and uniform, and the size control is very critical. At the same time, the pressure of the gas outlet during the electrolysis of water to produce hydrogen is as high as 3MPa, requiring the seal of the electrolysis group to be leak-proof and airtight under high pressure, and the sealing performance needs to be guaranteed. The control of the clamping force is very critical. The existing technology is to set a seal in the positive and negative metal plates, and form an electrolysis chamber in the middle of the seal. Because the seal generally has a certain elasticity, the compression size must be guaranteed while ensuring the seal. During the pressure change process, the deformation of the seal is large, which leads to the height of the electrolysis chamber, that is, the contact resistance between the proton membrane surface and the electrolysis plate is greatly affected by the clamping force. The electrolytic cell is composed of hundreds of stacked electrolytic units. Due to their own weight, the pressure of the upper electrolytic unit is quite different from that of the lower electrolytic unit. This makes it difficult to control the dimensional tolerance of the electrolytic unit, which greatly limits the overall performance of the electrolytic cell.

[0003] Therefore, the prior art needs to be improved. Summary of the invention

[0004] In view of this, the present invention provides a proton membrane water electrolysis hydrogen production electrolysis unit and an electrolysis device, which are used to solve the problem of difficult control of dimensional tolerance of the electrolysis unit in the prior art.

[0005] To achieve one or part or all of the above purposes or other purposes, the present invention provides a proton membrane water electrolysis hydrogen production electrolysis unit, comprising a negative metal plate, an upper gas diffusion layer, an insulating support plate, a lower gas diffusion layer, a proton membrane, a positive metal plate, an upper membrane sealing ring and a lower membrane sealing ring, wherein the negative metal plate, the insulating support plate and the positive metal plate are sequentially bonded from top to bottom; an electrolysis through hole is provided on the insulating support plate, and the upper gas diffusion layer, the proton membrane and the lower gas diffusion layer are sequentially stacked and installed in the electrolysis through hole and are located between the negative metal plate and the positive metal plate; the upper membrane sealing ring and the lower membrane sealing ring are respectively located on the upper and lower sides of the proton membrane, and the proton membrane is clamped under the pressing action of the negative metal plate and the positive metal plate, the upper gas diffusion layer is located in the inner ring of the upper membrane sealing ring, and the lower gas diffusion layer is located in the inner ring of the lower membrane sealing ring.

[0006] Preferably, the insulating support plate is a flat plate, and the thickness of the insulating support plate is equal to the sum of the thicknesses of the upper gas diffusion layer, the proton membrane and the lower gas diffusion layer under the compression of the negative metal plate and the positive metal plate.

[0007] Preferably, the upper membrane sealing ring and the lower membrane sealing ring are both elastic elements, and the four walls of the upper membrane sealing ring are respectively abutted against the negative metal plate, the upper gas diffusion layer, the proton membrane, and the insulating support plate, and the four walls of the lower membrane sealing ring are respectively abutted against the positive metal plate, the lower gas diffusion layer, the proton membrane, and the insulating support plate.

[0008] Preferably, the negative metal pole plate, the insulating support plate and the positive metal pole plate are provided with water inlet holes which penetrate the negative metal pole plate, the insulating support plate and the positive metal pole plate in sequence, and a first sealing ring is provided in the water inlet hole, and the first sealing ring is sealed and pressed between the lower side of the negative metal pole plate and the upper side of the positive metal pole plate; a first sealing groove is opened between the negative metal pole plate and the positive metal pole plate which are fitted to each other, and the first sealing groove is annular, and the water inlet hole passes through the inner circle of the first sealing groove, and the first sealing groove is provided with a second sealing ring.

[0009] The present invention also proposes an electrolysis device, comprising a plurality of proton membrane water electrolysis hydrogen production electrolysis units as described above stacked together, the electrolysis device also comprising an upper pressure plate, an upper insulating plate, a lower insulating plate and a lower pressure plate arranged in sequence, and the plurality of proton membrane water electrolysis hydrogen production electrolysis units stacked together are arranged between the upper insulating plate and the lower insulating plate.

[0010] Preferably, the electrolysis device includes a plurality of screws and a plurality of locking nuts. The screws pass through the upper pressure plate, the upper insulating plate, the negative metal plate, the insulating support plate, the positive metal plate, the lower insulating plate and the lower pressure plate and are locked with the locking nuts. The plurality of screws are arranged around the electrolysis chamber and the water inlet of the proton membrane water electrolysis hydrogen production electrolysis unit.

[0011] Implementing the embodiments of the present invention will have the following beneficial effects:

[0012] 1. The thickness of the electrolytic unit in the electrolytic device is equal to the sum of the thicknesses of the negative metal plate, the insulating support plate and the positive metal plate. All three are made of hard materials. Even if they are subjected to a large pressure, their deformation is very small. Compared with the traditional electrolytic device, the seal of the electrolytic chamber is arranged in the hollow position in the middle of the insulating support plate and does not participate in the control of the thickness of the electrolytic unit. Therefore, the electrolytic device provided by the present invention is very simple and stable in controlling the thickness tolerance, and the performance of the electrolytic device can be greatly improved;

[0013] 2. In the preferred embodiment, the seals at the water inlet and hydrogen outlet adopt a groove installation structure to install the seals at the corresponding positions. These seals do not participate in the control of the thickness of the electrolysis device, which further ensures the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] in:

[0016] Figure 1 It is a schematic diagram of a three-dimensional explosion structure of an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Magnified view at A in the middle;

[0018] Figure 3 It is a schematic diagram of a top view of an electrolytic unit with a negative metal plate below in one embodiment of the present invention;

[0019] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along section BB;

[0020] Figure 5 for Figure 4 Enlarged view at center C;

[0021] Figure 6 for Figure 4 Magnified view at D in the middle;

[0022] Figure 7 Schematic diagram of the bottom view of the positive metal plate in one embodiment of the present invention.

[0023] The reference numerals are as follows: 1. negative metal plate; 11. cathode flow channel groove; 111. first diversion protrusion; 12. second interface; 13. second drainage groove; 14. second sealing groove; 15. fifth interface; 16. gas outlet; 17. third drainage groove; 18. fourth sealing groove; 2. upper gas diffusion layer; 3. insulating support plate; 31. electrolysis through hole; 32. first interface; 321. first sealing ring; 33. fourth interface; 331. second sealing ring; 4. lower gas diffusion layer; 5. proton membrane; 6. positive metal plate; 61. anode Flow channel groove; 611, second diversion protrusion; 62, third interface; 63, water inlet; 64, first drainage groove; 65, first sealing groove; 66, sixth interface; 67, fourth drainage groove; 68, third sealing groove; 7, upper membrane sealing ring; 8, lower membrane sealing ring; 9, first inter-plate sealing ring; 91, first inter-plate sealing groove; 10, second inter-plate sealing ring; 20, upper pressure plate; 30, lower pressure plate; 40, upper insulating plate; 50, lower insulating plate; 60, mounting hole; 1000, water inlet hole; 2000, guide channel; 3000, hydrogen outlet hole. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] It is understood that the singular forms "a", "an" and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0027] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes. In the present invention, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, the above-mentioned part of the terms may be used to express other meanings in addition to being used to express orientation or position relationship, for example, the term "upper" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to the specific circumstances.

[0028] In addition, the terms "disposed", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Reference Figures 1 to 7 An embodiment of the present invention provides a proton membrane water electrolysis hydrogen production electrolysis unit, comprising a negative metal plate 1, an upper gas diffusion layer 2, an insulating support plate 3, a lower gas diffusion layer 4, a proton membrane 5, a positive metal plate 6, an upper membrane sealing ring 7 and a lower membrane sealing ring 8, wherein the negative metal plate 1, the insulating support plate 3 and the positive metal plate 6 are sequentially attached from top to bottom; an electrolysis through hole 31 is opened on the insulating support plate 3, and the upper gas diffusion layer 2, the proton membrane 5 and the lower gas diffusion layer 4 are sequentially stacked and installed on The electrolytic through hole 31 is located between the negative metal plate 1 and the positive metal plate 6; the upper membrane sealing ring 7 and the lower membrane sealing ring 8 are respectively located on the upper and lower sides of the proton membrane 5, and the proton membrane 5 is clamped under the pressure of the negative metal plate 1 and the positive metal plate 6, the upper gas diffusion layer 2 is located in the inner circle of the upper membrane sealing ring 7, the lower gas diffusion layer 4 is located in the inner circle of the lower membrane sealing ring 8, and the upper membrane sealing ring 7 and the lower membrane sealing ring 8 are both arranged in the electrolytic through hole 31.

[0030] In the electrolysis unit provided by the specific embodiment of the present invention, the negative metal plate 1, the insulating support plate 3 and the positive metal plate 6 are directly bonded in sequence. The thickness of the electrolysis unit is determined by and only by the negative metal plate 1, the insulating support plate 3 and the positive metal plate 6. All three are hard materials with strong pressure resistance. The seal of the electrolysis chamber is arranged in the hollow position in the middle of the insulating support plate 3 and does not participate in the control of the thickness of the electrolysis unit. Therefore, compared with the traditional electrolysis device, the electrolysis unit provided by the specific embodiment of the present invention is very simple and stable in controlling the thickness dimension tolerance, and the performance of the electrolysis device is greatly improved.

[0031] In some preferred embodiments, the upper membrane sealing ring 7, the lower membrane sealing ring 8 and the outer side of the proton membrane 5 are all in contact with the side of the electrolysis through hole 31. In this way, compared with the non-contact or incomplete contact mode, the upper membrane sealing ring 7 and the lower membrane sealing ring 8 have a larger sealing area and are limited, so that they are not easily moved or deformed in the horizontal direction, and the sealing effect is good.

[0032] It should be understood that the electrolysis unit is divided into two parts: support and membrane sealing. The outer ring is a support structure, including a negative metal plate 1, an insulating support plate and the positive metal plate 6; the inner core is an upper gas diffusion layer 2, a proton membrane 5, a lower gas diffusion layer 4, an upper membrane sealing ring 7 and a lower membrane sealing ring 8. The upper membrane sealing ring 7 and the lower membrane sealing ring 8 clamp the proton membrane 5 under the pressure of the negative metal plate 1 and the positive metal plate 6, and an electrolysis chamber is formed between the upper membrane sealing ring 7 and the lower membrane sealing ring 8.

[0033] In some optional embodiments, the insulating support plate 3 is a flat plate, and the thickness of the insulating support plate 3 is the sum of the thicknesses of the upper gas diffusion layer 2, the proton membrane 5, and the lower gas diffusion layer 4 under the compression of the negative metal pole plate 1 and the positive metal pole plate 6.

[0034] In some optional embodiments, the outer contour of the insulating support plate 3 is the same as the outer contour of the negative metal pole plate 1 and the positive metal pole plate 6, and the side-by-side negative metal pole plates 1 or positive metal pole plates 6 are an integrated structure; the insulating support plate 3 is provided with a water vapor port and a screw hole, which can cooperate with the corresponding through holes on the negative metal pole plate 1 and the positive metal pole plate 6, and a corresponding electrolytic chamber space is arranged in the middle of the insulating support plate 3; the insulating support plate 3 is made of a material that is resistant to high temperature, weak acid and weak alkali, and has high strength pressure resistance, small deformation and controllable performance.

[0035] In some optional embodiments, the upper membrane sealing ring 7 and the lower membrane sealing ring 8 are both elastic elements, and the four walls of the upper membrane sealing ring 7 are respectively abutted against the negative metal plate 1, the upper gas diffusion layer 2, the proton membrane 5, and the insulating support plate, and the four walls of the lower membrane sealing ring 8 are respectively abutted against the positive metal plate 6, the lower gas diffusion layer 4, the proton membrane 5, and the insulating support plate; during assembly, the negative metal plate 1 and the positive metal plate 6 compress the upper membrane sealing ring 7 and the lower membrane sealing ring 8 to seal the electrolysis chamber and isolate the two sides of the proton membrane 5.

[0036] In some optional embodiments, such as Figures 1 to 6 As shown, a cathode flow channel groove 11 is provided in the area of ​​the lower side of the negative metal electrode plate 1 facing the upper gas diffusion layer 2, and an anode flow channel groove 61 is provided in the area of ​​the upper side of the positive metal electrode plate 6 facing the lower gas diffusion layer 4; the negative metal electrode plate 1, the insulating support plate 3, and the positive metal electrode plate 6 are bonded together to form an electrolysis chamber, wherein the cathode flow channel groove 11 constitutes the top of the electrolysis chamber, the anode flow channel groove 61 constitutes the bottom of the electrolysis chamber, and the side wall of the electrolysis through hole 31 constitutes the side wall of the electrolysis chamber; a plurality of first shunt protrusions 111 are arrayed in the cathode flow channel groove 11, and a plurality of second shunt protrusions 611 are arrayed in the anode flow channel groove 61, and the sum of the thicknesses of the lower gas diffusion layer 4, the upper gas diffusion layer 2, and the proton membrane 5 is equal to the distance from the first shunt protrusion 111 to the second shunt protrusion 611. The array-type first flow-dividing protrusions 111 and the second flow-dividing protrusions 611 are respectively pressed against the upper gas diffusion layer 2 and the lower gas diffusion layer 4 to form a mesh-like flow channel, which is evenly stressed and facilitates the uniform flow of gas and liquid in the electrolysis chamber.

[0037] In some optional embodiments, such as Figure 4 and Figure 5 As shown, the first shunt protrusion 111 is flush with the lower side of the negative metal plate 1, the second shunt protrusion 611 is flush with the lower side of the positive metal plate 6, and the sum of the thickness of the lower gas diffusion layer 4, the upper gas diffusion layer 2, and the proton membrane 5 is equal to the thickness of the insulating support plate 3. Through such a size design, during assembly, the anode flow channel groove 61 and the cathode flow channel groove 11 do not participate in the horizontal positioning of the lower gas diffusion layer 4 and the upper gas diffusion layer 2, and installation is easier and more convenient. At the same time, the dimensional tolerance requirements of the anode flow channel groove 61 and the cathode flow channel groove 11 are relatively low, which is conducive to processing and production.

[0038] In some optional embodiments, such as Figures 1 to 7As shown, the insulating support plate 3 is provided with more than one first interface 32, the negative metal plate 1 is provided with a second interface 12 corresponding to each of the first interfaces 32, and the positive metal plate 6 is provided with a third interface 62 corresponding to each of the first interfaces 32. The second interface 12, the first interface 32, and the third interface 62 are connected to form a water inlet 1000. The positive metal plate 6 is also provided with a plurality of water inlets 63, and the water inlets 63 are connected to the water inlet 1000 and the anode flow channel 61. More specifically, in some optional embodiments, the water inlet 63 passes through the anode flow channel groove 61 to the lower side of the positive metal pole plate 6, and a plurality of first drainage grooves 64 are provided on the lower side of the positive metal pole plate 6, or a plurality of second drainage grooves 13 are provided on the upper side of the negative metal pole plate 1. After the two electrolysis units are superimposed, the water inlet 63 and the water inlet hole 1000 are connected through the first drainage groove 64 or the second drainage groove 13 to form a diversion channel 2000, and one end of the diversion channel 2000 is connected to the anode flow channel 61, and the other end is connected to the water inlet hole 1000. In another optional embodiment, a plurality of first drainage grooves 64 are provided on the lower side of the positive metal pole plate 6, and a plurality of second drainage grooves 13 are provided on the upper side of the negative metal pole plate 1, and the first drainage grooves 64 and the second drainage grooves 13 overlap one by one in the vertical direction. In this way, after the upper and lower electrolytic units are superimposed, the guide channel 2000 is formed by the first drainage grooves 64 and the second drainage grooves 13. In this embodiment, the height of the guide channel 2000 is distributed to the positive metal pole plate 6 and the negative metal pole plate 1, so as to minimize the influence of the groove depth on the structural strength of the positive metal pole plate 6 and the negative metal pole plate 1, that is, the pressure bearing requirements can be met under the conditions of lower thickness of the positive metal pole plate 6 and the negative metal pole plate 1, so that the thickness of the electrolytic unit can be designed to be relatively thin.

[0039] In some optional embodiments, such as Figure 1 , Figure 4 and Figure 6As shown, the negative metal pole plate 1, the insulating support plate 3 and the positive metal pole plate 6 are provided with a water inlet hole 1000 which passes through the negative metal pole plate 1, the insulating support plate 3 and the positive metal pole plate 6 in sequence, and a first sealing ring 321 is provided in the water inlet hole 1000, and the first sealing ring 321 is sealed and pressed between the lower side of the negative metal pole plate 1 and the upper side of the positive metal pole plate 6. Specifically, the water inlet hole 1000 includes a second interface 12 located on the negative metal pole plate 1, a first interface 32 located on the insulating support plate 3 and a third interface 62 located on the positive metal pole plate 6, the size of the first interface 32 is larger than the second interface 12 and the third interface 62, the first sealing ring 321 is located in the first interface 32, and the first sealing ring 321 is sealed and pressed between the lower side of the negative metal pole plate 1 and the upper side of the positive metal pole plate 6. In a preferred embodiment, as Figure 4 and Figure 6 As shown, the inner side of the first sealing ring 321 is flush with the side of the second interface 12 and the third interface 62, and the outer side of the first sealing ring 321 is in contact with the first interface 32. The first sealing ring 321 is used to seal the gap between the positive metal plate 6 and the insulating support plate 3 and the gap between the negative metal plate 1 and the insulating support plate 3.

[0040] In some optional embodiments, such as Figure 1 , Figure 4 and Figure 6 As shown, the electrolysis device further includes a first inter-plate sealing ring 9, a first inter-plate sealing groove 91 is provided between two adjacent electrolysis units, the first inter-plate sealing groove 91 is annular, the water inlet 1000 passes through the inner ring of the first inter-plate sealing groove 91, and the first inter-plate sealing ring 9 is pressed and installed in the first inter-plate sealing groove 91 by the negative metal plate 1 and the positive metal plate 6 above it. As a preferred embodiment, a first sealing groove 65 is provided on the lower side of the positive metal plate 6, and a second sealing groove 14 is correspondingly provided on the upper side of the negative metal plate 1. The first inter-plate sealing groove 91 is formed by the first sealing groove 65 and the second sealing groove 14. In this way, the height of the first inter-plate sealing groove 91 is distributed to the positive metal plate 6 and the negative metal plate 1, and the influence of the opening of the sealing groove on the structural strength of the positive metal plate 6 and the negative metal plate 1 is minimized.

[0041] In some optional embodiments, such as Figure 1 as well as Figures 3 to 7As shown, the insulating support plate 3 is provided with at least one fourth interface 33, the negative metal plate 1 is correspondingly provided with at least one fifth interface 15, the positive metal plate 6 is correspondingly provided with a sixth interface 66, the fifth interface 15, the fourth interface 33, and the sixth interface 66 are connected to form a hydrogen outlet hole 3000, and the negative metal plate 1 is also provided with a plurality of gas outlets 16, and the gas outlets 16 are connected to the hydrogen outlet hole 3000 and the cathode flow channel groove 11. More specifically, in some optional embodiments, the gas outlet 16 passes through the cathode flow channel groove 11 to the upper side of the negative metal pole plate 1, and a plurality of third drainage grooves 17 are provided on the upper side of the negative metal pole plate 1, or a plurality of fourth drainage grooves 67 are provided on the lower side of the positive metal pole plate 6. After the two electrolysis units are superimposed, a gas outlet channel is formed through the third drainage grooves 17 or the fourth drainage grooves 67, and one end of the gas outlet channel is connected to the cathode flow channel groove 11, and the other end is connected to the hydrogen outlet hole 3000. In another optional embodiment, a plurality of third drainage grooves 17 are provided on the upper side of the negative metal pole plate 1, and a plurality of fourth drainage grooves 67 are provided on the lower side of the positive metal pole plate 6, and the third drainage grooves 17 and the fourth drainage grooves 67 overlap one by one in the vertical direction. In this way, after the upper and lower electrolytic units are superimposed, the first drainage grooves 64 and the second drainage grooves 13 jointly form a gas outlet channel. In this embodiment, the height of the gas outlet channel is distributed to the positive metal pole plate 6 and the negative metal pole plate 1, so as to minimize the influence of the opening of the gas outlet channel on the structural strength of the positive metal pole plate 6 and the negative metal pole plate 1.

[0042] In some optional embodiments, such as Figure 1 , Figure 3 , Figure 4 , Figure 6 As shown, a second sealing ring 331 is provided in the fourth interface 33, and the second sealing ring 331 is sealed and pressed between the lower side of the negative metal plate 1 and the upper side of the positive metal plate 6. In this example, the inner side of the second sealing ring 331 is flush with the side of the fifth interface 15 and the sixth interface 66, and the outer side of the second sealing ring 331 is in contact with the fourth interface 33.

[0043] In some optional embodiments, such as Figure 1 , Figure 3 , Figure 7As shown, the electrolysis device also includes a second inter-plate sealing ring 10, a second inter-plate sealing groove is provided between two adjacent electrolysis units, the second inter-plate sealing groove is annular, the hydrogen outlet hole 3000 passes through the inner ring of the second inter-plate sealing groove, and the second inter-plate sealing ring 10 is pressed and installed in the second inter-plate sealing groove by the negative metal plate 1 and the positive metal plate 6. Similar to the structure of the first inter-plate sealing groove 91, as a preferred embodiment, the third sealing groove 68 is provided on the lower side of the positive metal plate 6, and the fourth sealing groove 18 is provided on the upper side of the negative metal plate 1, and the first inter-plate sealing groove 91 is formed by the third sealing groove 68 and the fourth sealing groove 18.

[0044] like Figure 1 As shown, an embodiment of the present invention further provides an electrolysis device, comprising an upper pressing plate 20, an upper insulating plate 40, a lower insulating plate 50 and a lower pressing plate 30 arranged in sequence, a plurality of the proton membrane water electrolysis hydrogen production electrolysis units stacked together are arranged between the upper insulating plate and the lower insulating plate, and are pressed by the upper pressing plate 20 and the lower pressing plate 30, the upper insulating plate 40 is arranged between the electrolysis unit and the upper pressing plate 20, and the lower insulating plate 50 is arranged between the electrolysis unit and the lower pressing plate 30. More specifically, the electrolysis device also includes a plurality of screws and locking nuts (not shown in the figure), and the upper pressing plate 20, the lower pressing plate 30, the upper insulating plate 40, the lower insulating plate 50, the negative metal plate 1, the insulating support plate 3 and the positive metal plate 6 are all provided with mounting holes 60, and the screws pass through the mounting holes 60 and are locked with the matching locking nuts. By clamping the electrolysis unit in the middle with the upper pressing plate 20 and the lower pressing plate 30 with good rigidity in cooperation with the screw and the locking nut, the force uniformity can be ensured as much as possible. The parts through which the screw passes are all hard parts and are incompressible. The compression of the screw and the locking nut will not affect the thickness of the electrolysis device. The periphery of the screw has the same force to ensure that the end plate will not warp. A number of the screws are arranged around the electrolysis chamber, the water inlet, and the hydrogen outlet, so that the force of the electrolysis device is more uniform.

[0045] In some optional embodiments, the material of the insulating support plate 3 is insulating polymer.

[0046] The electrolysis device provided by the embodiment of the present invention has the following beneficial effects:

[0047] 1. The thickness of the electrolytic unit in the electrolytic device is equal to that of the negative metal plate 1, the insulating support plate 3 and the positive metal plate 6. All three are made of hard materials. Even if they are subjected to a large pressure, their deformation is very small. Compared with the traditional electrolytic device, the seal of the electrolytic chamber is arranged in the hollow position in the middle of the insulating support plate 3 and does not participate in the size of the overall thickness. Therefore, the electrolytic device provided by the present invention is simple in size control and the stability of the device is greatly improved;

[0048] 2. In a preferred embodiment, the seals at the water inlet 1000 and the hydrogen outlet 3000 use a groove-type installation structure to install the seals at the corresponding positions. These seals do not participate in the control of the thickness of the electrolysis device, which further ensures the stability of the device.

[0049] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A proton membrane water electrolysis hydrogen production electrolysis unit, characterized in that: It comprises a negative metal plate, an upper gas diffusion layer, an insulating support plate, a lower gas diffusion layer, a proton membrane, a positive metal plate, an upper membrane sealing ring and a lower membrane sealing ring, wherein the negative metal plate, the insulating support plate and the positive metal plate are sequentially bonded from top to bottom; an electrolysis through hole is provided on the insulating support plate, and the upper gas diffusion layer, the proton membrane and the lower gas diffusion layer are sequentially stacked and installed in the electrolysis through hole and are located between the negative metal plate and the positive metal plate; the upper membrane sealing ring and the lower membrane sealing ring are respectively located on the upper and lower sides of the proton membrane, and the proton membrane is clamped under the pressing action of the negative metal plate and the positive metal plate, the upper gas diffusion layer is located in the inner ring of the upper membrane sealing ring, and the lower gas diffusion layer is located in the inner ring of the lower membrane sealing ring.

2. The proton membrane water electrolysis hydrogen production electrolysis unit according to claim 1, characterized in that: The insulating support plate is a flat plate, and the thickness of the insulating support plate is equal to the sum of the thicknesses of the upper gas diffusion layer, the proton membrane, and the lower gas diffusion layer under the compression of the negative metal plate and the positive metal plate.

3. The proton membrane water electrolysis hydrogen production electrolysis unit according to claim 2, characterized in that: The upper membrane sealing ring and the lower membrane sealing ring are both elastic elements. The four walls of the upper membrane sealing ring are respectively in contact with the negative metal plate, the upper gas diffusion layer, the proton membrane, and the insulating support plate. The four walls of the lower membrane sealing ring are respectively in contact with the positive metal plate, the lower gas diffusion layer, the proton membrane, and the insulating support plate.

4. The proton membrane water electrolysis hydrogen production electrolysis unit according to claim 1, characterized in that: The negative metal plate, the insulating support plate and the positive metal plate are provided with water inlet holes which penetrate the negative metal plate, the insulating support plate and the positive metal plate in sequence, and a first sealing ring is provided in the water inlet hole, and the first sealing ring is sealed and pressed between the lower side of the negative metal plate and the upper side of the positive metal plate; a first sealing groove is opened between the negative metal plate and the positive metal plate which are fitted to each other, and the first sealing groove is annular, and the water inlet hole passes through the inner circle of the first sealing groove, and the first sealing groove is provided with a second sealing ring.

5. An electrolysis device, characterized in that: It comprises a plurality of proton membrane water electrolysis hydrogen production electrolysis units as described in any one of claims 1 to 4 stacked together, the electrolysis device further comprising an upper pressure plate, an upper insulating plate, a lower insulating plate and a lower pressure plate arranged in sequence, and the plurality of proton membrane water electrolysis hydrogen production electrolysis units stacked together are arranged between the upper insulating plate and the lower insulating plate.

6. The electrolysis device according to claim 5, characterized in that: The electrolysis device includes a plurality of screw rods and a plurality of locking nuts. The screw rods pass through the upper pressure plate, the upper insulating plate, the negative metal plate, the insulating support plate, the positive metal plate, the lower insulating plate and the lower pressure plate and are locked with the locking nuts. The plurality of screw rods are arranged around the electrolysis chamber and the water inlet of the proton membrane water electrolysis hydrogen production electrolysis unit.

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