Proton exchange membrane water electrolyser and assembling device thereof

Abstract

The utility model provides a proton exchange membrane water electrolyser which has a good sealing effect and comprises an upper insulating end plate, a cathode collector plate, a polar plate membrane electrode assembly, an anode collector plate and a lower insulating end plate, the upper end hydrogen monopolar plate membrane electrode assembly and the adjacent middle section core assembly, the middle section core assemblies, the lower end monopolar plate assembly and the adjacent middle section core assembly, and the hydrogen monopolar plate assembly and the membrane electrode in the upper end hydrogen monopolar plate membrane electrode assembly are arranged in a staggered manner; a sealing gasket is arranged between the bipolar plate assembly and the membrane electrode in each middle section core assembly; and the limiting grooves at the side parts of the proton exchange membrane water electrolyser are not oppositely arranged at two opposite sides of the proton exchange membrane water electrolyser. In addition, the utility model further provides an assembly device of the proton exchange membrane water electrolyser, so that the assembly process of the proton exchange membrane water electrolyser is convenient, and the assembly and detection efficiency of the proton exchange membrane water electrolyser is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a proton exchange membrane water electrolyzer and an assembly device thereof. Background Art

[0002] Hydrogen has the characteristics of high calorific value, no carbon emissions and no pollution in its reaction products after being used as fuel. It can be used as an energy storage material to connect the energy demand side and the energy supply side, and is considered to be an energy carrier with broad application prospects. Proton exchange membrane water electrolysis hydrogen production technology has the advantages of high working current density, high hydrogen production purity, compact structure, rapid start and stop, and fast dynamic response. It can well adapt to the volatility of renewable energy generation. While making full use of renewable energy resources, this technology can better help the electricity generated by solar and wind power to be integrated into the power grid, thereby realizing the "peak shaving and valley filling" of the power grid, and therefore has broad development prospects.

[0003] Since hydrogen has a small molecular weight and is very easy to leak, high requirements are placed on the assembly and sealing of the proton exchange membrane electrolyzer. At the same time, the various components of the proton exchange membrane water electrolyzer need to be positioned and placed on the assembly device during assembly, and the traditional external positioning method requires positioning in the four directions of front, back, left, and right, so at least four positioning guide rods are required. Although the internal positioning method requires at least two positioning guide rods, it is necessary to open a hole inside the flat plate, and the positioning hole will occupy the space that could have been used on the plane. In addition, the existing proton exchange membrane electrolyzer needs to be removed from the assembly device after assembly before it can be connected to the test device to detect the electrolytic performance. However, since the number of components of the electrolyzer is very large, if there are components with poor electrochemical performance in the assembled electrolyzer, it is necessary to re-install the electrolyzer into the assembly device, press it, and then remove the pre-tightening bolts. This process is very complicated, which reduces the work efficiency of the electrolyzer assembly and increases the labor cost. Utility Model Content

[0004] Aiming at the problem of insufficient sealing of existing proton exchange membrane electrolyzers, the utility model provides a proton exchange membrane water electrolyzer with good sealing effect. Meanwhile, aiming at the problem that the positioning structure of the existing proton exchange membrane electrolyzers is complicated during assembly and it is inconvenient to replace parts after assembly, the utility model provides an assembly device of the proton exchange membrane water electrolyzer, so that the assembly process of the proton exchange membrane water electrolyzer is convenient. After assembly and pressing, the pipeline and DC power cable of the water electrolyzer test bench can be directly connected to the assembly device without applying an assembly component for fastening to carry out a preliminary test of the electrolysis performance, so as to check whether each component meets the electrochemical performance designed by the electrolyzer, and the components with abnormal performance can be easily replaced, so as to greatly improve the assembly and detection efficiency of the proton exchange membrane water electrolyzer.

[0005] The technical scheme is as follows: a proton exchange membrane water electrolyzer, which includes an upper insulating end plate, a cathode collector plate, a contact carbon paper, a plate membrane electrode assembly, an anode collector plate and a lower insulating end plate fastened together by an assembly component, and the side of the proton exchange membrane water electrolyzer is also provided with a limit groove extending vertically, the plate membrane electrode assembly includes an upper hydrogen monopolar plate membrane electrode assembly, a plurality of stacked middle section core assemblies, and a lower monopolar plate assembly, the upper hydrogen monopolar plate membrane electrode assembly includes a hydrogen monopolar plate assembly and a membrane electrode, the middle section core assembly includes The invention comprises a bipolar plate assembly and a membrane electrode, and is characterized in that: sealing gaskets are provided between the upper hydrogen monopolar plate membrane electrode assembly and the adjacent middle section core assembly, between each middle section core assembly, between the lower monopolar plate assembly and the adjacent middle section core assembly, between the hydrogen monopolar plate assembly and the membrane electrode in the upper hydrogen monopolar plate membrane electrode assembly, and between the bipolar plate assembly and the membrane electrode in each middle section core assembly; the limiting groove is square and the limiting groove is not arranged on opposite sides of the proton exchange membrane water electrolyzer.

[0006] Furthermore, a sealing gasket is also provided between the upper insulating end plate and the electrode plate membrane electrode assembly, one side of the sealing gasket is bonded to the non-flow channel surface of the hydrogen monopolar plate assembly, and the other side is bonded to the upper insulating end plate, and the contact carbon paper is located in the limiting hole of the porous conductive layer in the middle of the sealing gasket, and is respectively bonded to the non-flow channel surface of the hydrogen monopolar plate assembly and the cathode collector plate.

[0007] Further, one side of the sealing gasket in the upper hydrogen monopolar plate membrane electrode assembly is in contact with the cathode surface of the hydrogen monopolar plate assembly, and the other side is in contact with the exposed portion of the proton exchange membrane in the upper hydrogen monopolar plate membrane electrode assembly;

[0008] One side of the sealing gasket between the upper hydrogen monopolar plate membrane electrode assembly and the middle section core assembly contacts the exposed portion of the proton exchange membrane of the upper hydrogen monopolar plate membrane electrode assembly, and the other side is in contact with the anode surface of the middle section core assembly;

[0009] One side of the sealing gasket between the two intermediate section core components is in contact with the anode surface of one of the intermediate section core components, and the other side is in contact with the exposed part of the proton exchange membrane of the other intermediate section core component;

[0010] One side of the sealing gasket in the middle section core component is in contact with the exposed portion of the proton exchange membrane in the middle section core component, and the other side is in contact with the cathode surface in the middle section core component;

[0011] One side of the sealing gasket between the middle section core assembly and the lower end monopolar plate assembly contacts the exposed portion of the proton exchange membrane of the middle section core assembly, and the other side is in contact with the anode surface of the lower end monopolar plate assembly;

[0012] The membrane electrode comprises an anode porous transport layer, an anode catalyst layer, the proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer which are arranged in sequence. The anode porous transport layer and the cathode gas diffusion layer are respectively located in the corresponding porous conductive layer limiting holes in the middle of the sealing gasket.

[0013] Furthermore, the limiting grooves are provided on both sides of the upper insulating end plate, the electrode plate membrane electrode assembly, the sealing gasket, the anode collector plate and the lower insulating end plate.

[0014] Further, the upper insulating end plate is provided with a water-oxygen inlet through hole, a water-oxygen outlet through hole, a hydrogen outlet through hole, and a hydrogen end drainage through hole for installing a water-oxygen water inlet joint, a water-oxygen outlet joint, a hydrogen outlet joint, and a hydrogen end drainage joint, respectively; the electrode plate membrane electrode assembly and the sealing gasket are respectively provided with a water-oxygen inlet main pipe hole, a water-oxygen outlet main pipe hole, a hydrogen outlet main pipe hole, and a hydrogen end drainage main pipe hole connected with the water-oxygen inlet through hole, the water-oxygen outlet through hole, the hydrogen outlet through hole, and the hydrogen end drainage through hole; the water-oxygen inlet main pipe hole is connected with the water-oxygen outlet main pipe hole through a water flow groove on the electrode plate membrane electrode assembly or on the anode surface of the lower end monopolar plate assembly; the hydrogen outlet main pipe hole is connected with the hydrogen end drainage main pipe hole through a gas flow groove on the electrode plate membrane electrode assembly or on the cathode surface of the hydrogen monopolar plate assembly.

[0015] Furthermore, a sealing groove cavity is provided around the lower surface of the upper insulating end plate corresponding to the water-oxygen inlet through hole, the water-oxygen outlet through hole, the hydrogen outlet through hole, and the hydrogen end drainage through hole, and the sealing groove cavity has a sealing line 1 built in;

[0016] An anode sealing slot cavity is provided on the outer edges of both sides of each main pipe hole surrounding the anode electrode surface and the water flow groove, and a cathode sealing slot cavity is provided on the outer edges of both sides of each main pipe hole surrounding the cathode electrode surface and the air flow groove. The anode sealing slot cavity and the cathode sealing slot cavity are respectively equipped with an anode sealing line and a cathode sealing line.

[0017] Furthermore, the bipolar plate assembly includes a bipolar plate body, an anode metal sheet, the anode sealing line, a cathode metal sheet, and the cathode sealing line. The bipolar plate body includes an anode electrode surface and a cathode electrode surface. The anode metal sheet is embedded in the anode metal sheet groove of the anode electrode surface of the bipolar plate body, and the cathode metal sheet is embedded in the cathode metal sheet groove of the cathode electrode surface of the bipolar plate body. The water-oxygen inlet manifold hole and the hydrogen outlet manifold hole are opened on the same side of the bipolar plate body, and the water-oxygen outlet manifold hole and the hydrogen end drainage manifold hole are opened on the same side of the bipolar plate body.

[0018] The anode surface of the bipolar plate body is provided with a water flow groove, an anode metal sheet groove and an anode sealing groove cavity, the water-oxygen inlet main pipe hole of the anode surface is connected with the water-oxygen outlet main pipe hole through the water flow groove, the depth of the water flow groove at a position close to the water-oxygen inlet main pipe hole and the water-oxygen outlet main pipe hole is greater than the depth of the water flow groove body, and the anode metal sheet groove is opened at a position close to the water-oxygen inlet main pipe hole and the water-oxygen outlet main pipe hole for embedding the anode metal sheet;

[0019] The cathode surface of the bipolar plate body is provided with an airflow groove, a cathode metal sheet groove and a cathode sealing groove cavity. The hydrogen outlet main pipe hole of the cathode surface is connected with the hydrogen end drainage main pipe hole through the airflow groove. The depth of the airflow groove near the hydrogen outlet main pipe hole and the hydrogen end drainage main pipe hole is greater than the depth of the airflow groove body, and a cathode metal sheet groove is provided near the hydrogen outlet main pipe hole and the hydrogen end drainage main pipe hole for embedding the cathode metal sheet.

[0020] Furthermore, the lower insulating end plate comprises an upper plate, a lower plate and a plurality of springs, a plurality of spring holes are opened in the middle of the facing surfaces of the upper plate and the lower plate, and the springs are placed in the spring holes.

[0021] A proton exchange membrane water electrolyzer assembly device, comprising an adjustable pressure machine, a positioning guide rod, a lower pad and an upper pad, wherein the adjustable pressure machine comprises a cylinder and a push plate, and is characterized in that: it is used for the assembly of the above-mentioned proton exchange membrane water electrolyzer, the positioning guide rod corresponds to the shape and position of the limit groove on the side of the proton exchange membrane water electrolyzer, the cylinder is connected to the push plate and drives the push plate to move up and down, the push plate is installed with the lower pad, and the upper pad is provided just above the lower pad The lower pad is in contact with the lower insulating end plate of the proton exchange membrane water electrolyzer, the upper pad is in contact with the upper insulating end plate of the proton exchange membrane water electrolyzer, the positioning guide rod is vertically arranged and passes through the push plate, the side of the lower pad is provided with a limiting groove matched with the positioning guide rod, and the upper pad is provided with a joint accommodating groove for avoiding the water-oxygen inlet through hole, the water-oxygen outlet through hole, the hydrogen outlet through hole, the hydrogen end drainage through hole and enabling them to communicate with the outside.

[0022] The beneficial effects of the utility model are as follows: the pole plates and end plates of the proton exchange membrane water electrolyzer provided by the utility model are simple in design, so the manufacturing cost is low; secondly, the electrolyzer adopts a double sealing structure of a sealing line and a sealing gasket, which can achieve a good sealing effect, prevent gas leakage inside the electrolyzer and hydrogen leakage to the outside, and thus has good safety; and, the water electrolyzer structure takes into account the compression amount of the sealing structure when pressurizing, and the membrane electrode and the pole plate of the electrolyzer can achieve good contact, reducing the contact resistance, so it has good electrolysis performance; at the same time, only two positioning grooves need to be opened on both sides of the outside of the proton exchange membrane water electrolyzer, so that the proton exchange membrane water electrolyzer can be positioned in four directions of front, back, left and right by embedding the positioning guide rod during assembly, thereby simplifying the positioning structure.

[0023] The assembly device provided by the utility model simplifies the preparation process of the proton exchange membrane water electrolyzer. Due to the provision of the joint receiving groove, after the assembly is completed, there is no need to remove the assembled proton exchange membrane water electrolyzer, and the pipeline and DC power supply cable of the water electrolyzer test bench can be directly connected to carry out a preliminary test of the electrolysis performance, thereby greatly improving the work efficiency of assembly and testing and reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a proton exchange membrane water electrolyzer;

[0025] Figure 2 It is a schematic diagram of the decomposed structure of a proton exchange membrane water electrolyzer;

[0026] Figure 3 It is a schematic diagram of the matching structure between the upper insulating end plate of the body section and the cathode collector plate;

[0027] Figure 4It is a schematic diagram of the matching structure of the lower insulating end plate of the body section;

[0028] Figure 5 It is a schematic diagram of the fitting relationship of the electrode plate membrane electrode assembly of the body section;

[0029] Figure 6 It is a schematic diagram of membrane electrode structure;

[0030] Figure 7 It is a schematic diagram of the exploded structure of the bipolar plate anode surface of the bipolar plate assembly;

[0031] Figure 8 It is a schematic diagram of the exploded structure of the cathode surface of the bipolar plate of the bipolar plate assembly;

[0032] Fig. 9 It is a schematic diagram of the structure of the anode surface of the bipolar plate body and the water flow monopolar plate body;

[0033] Fig.10 It is a schematic diagram of the structure of the cathode surface of the bipolar plate body and the hydrogen monopolar plate body;

[0034] Fig.11 It is a structural schematic diagram of a main body section of a proton exchange membrane water electrolyzer being loaded on its assembly device;

[0035] Fig.12 It is a schematic diagram of the separate placement structure of the main body section of the proton exchange membrane water electrolyzer and its assembly device;

[0036] Fig.13 It is a schematic diagram of the assembly device structure of the utility model;

[0037] Fig.14 It is a schematic diagram of the exploded structure of the adjustable press of the utility model;

[0038] Fig.15 It is a structural schematic diagram of a body section being loaded on an assembly device and undergoing leak detection. DETAILED DESCRIPTION

[0039] Combination Figure 1 , Figure 2 , Figure 5A proton exchange membrane water electrolyzer 1 is shown, which includes an upper insulating end plate 211, a cathode collector plate 212, a contact carbon paper 22, a plate membrane electrode assembly 4, an anode collector plate 24 and a lower insulating end plate 25, which are fastened together by an assembly component. The plate membrane electrode assembly 4 includes an upper hydrogen monopolar plate membrane electrode assembly 43, a plurality of stacked middle section core assemblies 42, and a lower monopolar plate assembly 41. The upper hydrogen monopolar plate membrane electrode assembly 43 includes a hydrogen monopolar plate assembly 431 and a membrane electrode 421, and the middle section core assembly 42 includes a bipolar plate assembly 5 and a membrane electrode 421. Sealing gaskets 23 are provided between the upper hydrogen monopolar plate membrane electrode assembly 43 and the adjacent middle section core assembly 42, between each middle section core assembly 42, between the lower monopolar plate assembly 41 and the adjacent middle section core assembly 42, between the hydrogen monopolar plate assembly 431 and the membrane electrode 421 in the upper hydrogen monopolar plate membrane electrode assembly 43, and between the bipolar plate assembly 5 and the membrane electrode 421 in each middle section core assembly 42. By arranging the sealing gaskets 23 at the above-mentioned positions, the sealing between the above-mentioned components in the proton exchange membrane water electrolyzer 1 can be effectively ensured.

[0040] In addition to the above-mentioned positions, a sealing gasket 23 is also provided between the upper insulating end plate 211 and the electrode membrane electrode assembly 4. One side of the sealing gasket 23 is in contact with the non-flow channel surface 43111 of the hydrogen monopolar plate assembly 431, and the other side is in contact with the upper insulating end plate 211. The contact carbon paper 22 is located in the porous conductive layer limiting hole 231 in the middle of the sealing gasket 23, and is respectively in contact with the non-flow channel surface 43111 of the hydrogen monopolar plate assembly 431 and the cathode collector plate 212.

[0041] Meanwhile, the specific configuration of the sealing gasket 23 is as follows: Figure 6 The membrane electrode 421 includes an anode porous transport layer 4211, an anode catalyst layer 4212, a proton exchange membrane 4213, a cathode catalyst layer 4214 and a cathode gas diffusion layer 4215 arranged in sequence; a porous conductive layer limiting hole 231 is provided in the middle of the sealing gasket 23; Figure 2 , Figure 3 One side of the sealing gasket 23 in the upper hydrogen monopolar plate membrane electrode assembly 43 is in contact with the cathode surface 512 of the hydrogen monopolar plate assembly 431, and the other side is in contact with the exposed portion 42131 of the proton exchange membrane 4213 in the upper hydrogen monopolar plate membrane electrode assembly 43. Figure 2 , Figure 5 , Figure 6 One side of the sealing gasket 23 between the upper hydrogen monopolar plate membrane electrode assembly 43 and the middle section core assembly 42 contacts the exposed portion 42131 of the proton exchange membrane 4213 of the upper hydrogen monopolar plate membrane electrode assembly 43, and the other side is in contact with the anode surface 511 of the middle section core assembly 42. Figure 5One side of the sealing gasket 23 in the middle section core component 42 is in contact with the exposed portion 42131 of the proton exchange membrane 4213 in the middle section core component 42, and the other side is in contact with the cathode surface 512 in the middle section core component 42. Figure 5 One side of the sealing gasket 23 between the two middle section core components 42 is in contact with the anode surface 511 of one of the middle section core components 42, and the other side is in contact with the exposed portion 42131 of the proton exchange membrane 4213 of the other middle section core component 42. Figure 5 One side of the sealing gasket 23 between the middle section core assembly 42 and the lower end monopolar plate assembly 41 contacts the exposed portion 42131 of the proton exchange membrane 4213 of the middle section core assembly 42, and the other side is in contact with the anode electrode surface 511 of the lower end monopolar plate assembly 41. The anode porous transport layer 4211 and the cathode gas diffusion layer 4215 of the membrane electrode 421 are respectively located in the corresponding porous conductive layer limiting holes 231 of the sealing gasket 23.

[0042] As for the setting of the limiting groove 331, combined with Figure 1 , Figure 2 and Figure 5 The limiting groove 331 is square and concave, and the limiting groove 331 is not arranged on the opposite sides of the proton exchange membrane water electrolyzer 1. Specifically, the limiting groove 331 is opened on both sides of the upper insulating end plate 211, the plate membrane electrode assembly 4, the sealing gasket 23, the anode collector plate 24 and the lower insulating end plate 25. Such a structure of the proton exchange membrane water electrolyzer 1 allows the subsequent assembly to be combined with Fig.11 , by embedding two square positioning guide rods 32 into the limiting grooves 331 of the components of the electrolytic cell, the positioning of the components of the electrolytic cell in the horizontal direction during stacking can be achieved. At this time, each square positioning guide rod 32 has three-sided contact with the components of the electrolytic cell, and the limiting in three directions is achieved. Compared with the traditional internal positioning method, since the limiting grooves 331 in this scheme are on both sides, the positioning structure will not occupy too much area inside the electrode plate, so that a larger available space can be reserved for the sealing groove cavity and the flow channel groove, which relatively saves the cost of the electrode plate processing material. Compared with external positioning, the present invention only needs two square positioning guide rods 32 to achieve positioning, and optimizes the structure of the assembly device. In addition, since the two limiting grooves 331 are not on the same central axis (i.e., not opposite) on the plane, the presence of the positioning guide rod 32 can provide additional support or restriction, which can prevent the components of the electrolytic cell from being deflected or tilted during the assembly process.

[0043] Combination Figure 1 , Figure 2 , Figure 3The upper insulating end plate 211 is provided with a water-oxygen inlet through hole 2111, a water-oxygen outlet through hole 2113, a hydrogen outlet through hole 2112, and a hydrogen end drainage through hole 2114 for installing a water-oxygen water inlet joint 13, a water-oxygen outlet joint 14, a hydrogen outlet joint 15, and a hydrogen end drainage joint 16, respectively. Figure 5 , Figure 6 The electrode plate membrane electrode assembly 4 and the sealing gasket 23 are respectively provided with a water-oxygen inlet main pipe hole 513, a water-oxygen outlet main pipe hole 514, a hydrogen outlet main pipe hole 515, and a hydrogen end drainage main pipe hole 516 which are connected with the water-oxygen inlet through hole 2111, the water-oxygen outlet through hole 2113, the hydrogen outlet through hole 2112, and the hydrogen end drainage through hole 2114. The water-oxygen inlet main pipe hole 513 is connected with the water-oxygen outlet main pipe hole 514 through a water flow groove 5111 on the electrode plate membrane electrode assembly 4 or on the anode surface 511 of the lower end monopolar plate assembly 41, and the hydrogen outlet main pipe hole 515 is connected with the hydrogen end drainage main pipe hole 516 through a gas flow groove 5121 on the electrode plate membrane electrode assembly 4 or on the cathode surface 512 of the hydrogen monopolar plate assembly 431.

[0044] On this basis, in order to further ensure the sealing performance, Figure 3 The lower surface of the upper insulating end plate 211 is provided with a sealing groove cavity 2115 around the water-oxygen inlet through hole 2111, the water-oxygen outlet through hole 2113, the hydrogen outlet through hole 2112, and the hydrogen end drainage through hole 2114. The sealing groove cavity 2115 has a sealing line 213 built in; combined Figure 7 and Figure 8 Anode sealing groove cavities 5113 are provided on the outer edges of both sides of each main pipe hole and water flow groove 5111 surrounding the anode electrode surface 511, and cathode sealing groove cavities 5123 are provided on the outer edges of both sides of each main pipe hole and air flow groove 5121 surrounding the cathode electrode surface 512. The anode sealing groove cavity 5113 and the cathode sealing groove cavity 5123 are respectively equipped with anode sealing lines 55 and cathode sealing lines 54. By setting the sealing lines, the sealing between the channels for circulating gas and liquid in the proton exchange membrane water electrolyzer 1 and other structures of the water electrolyzer can be effectively ensured.

[0045] Taking the bipolar plate assembly 5 as an example, the specific installation structure of the sealing line is as follows: Figure 7 , Figure 8The bipolar plate assembly 5 includes a bipolar plate body 51, an anode metal sheet 53, an anode sealing line 55, a cathode metal sheet 52, and a cathode sealing line 54. The anode metal sheet 53 is embedded in the anode metal sheet groove 5112 of the anode surface 511 of the bipolar plate body 51, the cathode metal sheet 52 is embedded in the cathode metal sheet groove 5122 of the cathode surface 512 of the bipolar plate body 51, and the anode sealing line 55 and the cathode sealing line 54 are respectively embedded in the anode sealing groove cavity 5113 and the cathode sealing groove cavity 5123. Figure 7 and Figure 8 The bipolar plate body 51 specifically includes an anode electrode surface 511 and a cathode electrode surface 512, and is provided with a water-oxygen inlet manifold hole 513, a water-oxygen outlet manifold hole 514, a hydrogen outlet manifold hole 515, and a hydrogen end drainage manifold hole 516. The water-oxygen inlet manifold hole 513 and the hydrogen outlet manifold hole 515 are opened on the same side of the bipolar plate body 51, and the water-oxygen outlet manifold hole 514 and the hydrogen end drainage manifold hole 516 are opened on the same side.

[0046] The above are specific arrangements made to ensure the sealing of the proton exchange membrane water electrolyzer 1. The materials of the above-mentioned sealing gasket 23, sealing line and other components can be polytetrafluoroethylene, silicone rubber, fluororubber, etc. In order to better understand the specific structure of the proton exchange membrane water electrolyzer 1, the specific structure of the proton exchange membrane water electrolyzer 1 is described in detail below in conjunction with the accompanying drawings.

[0047] See Figure 1-Figure 2 A proton exchange membrane water electrolyzer 1 is composed of a body section 2, an assembly screw 11, an assembly nut 12, a water-oxygen water inlet joint 13, a water-oxygen outlet joint 14, a hydrogen outlet joint 15 and a hydrogen end drainage joint 16. The assembly screw 11 axially passes through the end electrical union 21 and the lower insulating end plate 25 of the body section 2, and the assembly nut 12 and the assembly screw 11 are threadedly connected to fasten the upper surface of the end electrical union 21 and the lower surface of the lower insulating end plate 25. The water-oxygen water inlet joint 13 and the water-oxygen outlet joint 14 are arranged at the diagonal position of the upper surface of the end electrical union 21, and are respectively screwed to the water-oxygen inlet through hole 2111 and the water-oxygen outlet through hole 2113 of the end electrical union 21. The hydrogen outlet connector 15 and the hydrogen end drainage connector 16 are also installed at the diagonal position of the upper surface of the terminal electrical union 21, and are respectively screwed to the hydrogen outlet through hole 2112 and the hydrogen end drainage through hole 2114 of the terminal electrical union 21 through threads.

[0048] See Figure 1-Figure 3The main body section 2 of the proton exchange membrane water electrolyzer 1 includes an end-electrical complex 21, a contact carbon paper 22, a sealing gasket 23, a plate membrane electrode assembly 4, an anode collector plate 24 and a lower insulating end plate 25. The upper surface of the upper plate 251 of the lower insulating end plate 25 contacts the lower surface of the anode collector plate 24, and the upper surface of the anode collector plate 24 is bonded to the smooth surface of the water flow monopolar plate assembly 411 in the plate membrane electrode assembly 4. The non-flow channel surface 43111 of the hydrogen monopolar plate assembly 431 of the plate membrane electrode assembly 4 is directly bonded to one side of the sealing gasket 23. The contact carbon paper 22 is located in the porous conductive layer limiting hole 231 in the middle of the sealing gasket 23 and is bonded to the non-flow channel surface 43111 of the hydrogen monopolar plate assembly 431. The other side of the contact carbon paper 22 is bonded to the cathode collector plate 212 of the end-electrical complex 21. At the same time, the water-oxygen inlet main pipe hole 513, the water-oxygen outlet main pipe hole 514, the hydrogen outlet main pipe hole 515 and the hydrogen end drainage main pipe hole 516 of the electrode plate membrane electrode assembly 4 and the sealing gasket 23 are respectively interconnected with the water-oxygen inlet through hole 2111, the water-oxygen outlet through hole 2113, the hydrogen outlet through hole 2112 and the hydrogen end drainage through hole 2114 of the terminal electrical complex 21.

[0049] See Figure 3 The terminal assembly 21 includes an upper insulating end plate 211, a cathode collector plate 212 and a sealing line 213. The cathode collector plate 212 and the cathode pole ear 2121 thereon are embedded in the recessed space 2116 on the lower surface of the upper insulating end plate 211. The upper insulating end plate 211 is provided with a water-oxygen inlet through hole 2111, a water-oxygen outlet through hole 2113, a hydrogen outlet through hole 2112 and a hydrogen end drainage through hole 2114. A sealing groove cavity 2115 is provided around each through hole on the lower surface thereof for placing the sealing line 213. The upper and lower ends of the upper insulating end plate 211 are provided with a limiting groove 331, the left and right sides are provided with an assembly bolt hole 2118, and one side is provided with a pole ear connection bolt hole 2117. The pole ear connection bolt hole 2117 is coaxial with and connected to the pole ear connection bolt hole 2117 on the cathode pole ear 2121 of the cathode collector plate 212.

[0050] See Figure 2 The sealing gasket 23 is provided with a water-oxygen inlet main pipe hole 513, a water-oxygen outlet main pipe hole 514, a hydrogen outlet main pipe hole 515, a hydrogen end drainage main pipe hole 516 and a porous conductive layer limiting hole 231, and a limiting groove 331 is provided on the front and rear sides thereof.

[0051] See Figure 1 and Figure 2 The front and rear sides of the anode collector plate 24 are provided with limiting grooves 331 , the anode pole lug 241 on the anode collector plate 24 is exposed on the upper plate 251 of the lower insulating end plate 25 , and the anode pole lug 241 is provided with a lug connecting bolt hole 2411 .

[0052] See Figure 4 The lower insulating end plate 25 is composed of an upper plate 251, a lower plate 252 and a plurality of springs 253. A plurality of spring holes 2511 are provided in the middle of the facing surfaces of the upper plate 251 and the lower plate 252, and the springs 253 are placed in the spring holes 2511 of the upper plate 251 and the lower plate 252. Assembly bolt holes 2118 are provided on the left and right sides of the lower plate 252, and a pole ear connection bolt hole 2411 is provided on one side. The distance between the left and right side surfaces of the upper plate 251 is the same as the distance between the left and right side surfaces of the electrode plate membrane electrode assembly 4, but is less than the minimum distance between the corresponding assembly bolt holes 2118 on the left and right sides of the lower plate 252. In addition, limiting grooves 331 are provided on the front and rear side surfaces of the upper plate 251 and the lower plate 252.

[0053] See Figure 5 and Figure 6 , the plate membrane electrode assembly 4 is composed of a lower monopolar plate assembly 41, N (N>1) identical middle section core assemblies 42 and an upper hydrogen monopolar plate membrane electrode assembly 43. Multiple middle section core assemblies 42 are stacked and connected, and the anode pole surface 511 of one middle section core assembly 42 and the sealing gasket 23 bonded to the pole surface are respectively in contact with the anode porous transmission layer 4211 and the exposed part 42131 of the proton exchange membrane 4213 of the membrane electrode 421 of another middle section core assembly 42. The exposed part 42131 of the proton exchange membrane 4213 and the anode porous transmission layer 4211 of the middle section core assembly 42 adjacent to the lower monopolar plate assembly 41 are respectively bonded to the sealing gasket 23 and the anode pole surface 511 of the lower monopolar plate assembly 41. The bipolar plate anode surface 511 and the sealing gasket 23 of the middle section core assembly 42 adjacent to the upper hydrogen monopolar plate membrane electrode assembly 43 are respectively fitted with the anode porous transmission layer 4211 of the membrane electrode 421 and the exposed part 42131 of the proton exchange membrane 4213 in the upper hydrogen monopolar plate membrane electrode assembly 43. Each anode porous transmission layer 4211 is placed in the corresponding porous conductive layer limiting hole 231 of the sealing gasket 23. At the same time, the lower monopolar plate assembly 41, the repeated middle section core assembly 42 and the water-oxygen inlet manifold holes 513, the water-oxygen outlet manifold holes 514, the hydrogen outlet manifold holes 515, and the hydrogen end drainage manifold holes 516 of the upper hydrogen monopolar plate membrane electrode assembly 43 are correspondingly connected.

[0054] See Figure 5 , Figure 6 and Figure 8The middle section core component 42 is sequentially connected by the membrane electrode 421, the sealing gasket 23, the bipolar plate assembly 5 and the sealing gasket 23 on the other side. The exposed portion 42131 of the proton exchange membrane 4213 in the membrane electrode 421 contacts the sealing gasket 23, and the cathode gas diffusion layer 4215 of the membrane electrode 421 fits the range covered by the gas flow groove 5121 of the cathode electrode surface 512, and is placed in the corresponding porous conductive layer limiting hole 231 of the sealing gasket 23. The bipolar plate assembly 5, the sealing gasket 23 and the main pipe holes of the membrane electrode 421 are correspondingly connected.

[0055] See Figure 5 and Figure 6 The membrane electrode 421 is composed of an anode porous transport layer 4211, an anode catalyst layer 4212, a proton exchange membrane 4213, a cathode catalyst layer 4214 and a cathode gas diffusion layer 4215. One side of the proton exchange membrane 4213 is coated with an iridium-based catalyst slurry in an area smaller than the porous conductive layer limiting hole 231 in the middle of the sealing gasket 23 to form the anode catalyst layer 4212, and the other side is coated with a platinum-based catalyst slurry at a corresponding position to form the cathode catalyst layer 4214. The other side of the anode catalyst layer 4212 contacts the inner surface of the anode porous transport layer 4211, and the other side of the cathode catalyst layer 4214 contacts the inner surface of the cathode gas diffusion layer 4215. The proton exchange membrane 4213 is provided with a limiting groove 331 so that its outer edge is completely the same as the outer edge of the sealing gasket 23. In addition, the proton exchange membrane 4213 is provided with a water-oxygen inlet manifold hole 513, a water-oxygen outlet manifold hole 514, a hydrogen outlet manifold hole 515, and a hydrogen end drainage manifold hole 516, which are identical to and correspond to the manifold holes on the sealing gasket 23. The anode porous transmission layer 4211 and the cathode gas diffusion layer 4215 are specifically made of sintered fiber titanium felt material, and the areas of the two are the same and equal to the area of ​​the catalyst layer. It is worth mentioning that the material of the membrane electrode 421 can also be replaced by other materials with the same or similar functions according to actual conditions.

[0056] See Figure 7 and Fig. 9, the upper and lower sides of the bipolar plate body 51 are further provided with limit grooves 331, and the anode surface 511 of the bipolar plate body 51 is provided with a water flow groove 5111, an anode metal sheet groove 5112 and an anode sealing groove cavity 5113. The water-oxygen inlet manifold hole 513 of the anode surface 511 is connected with the water-oxygen outlet manifold hole 514 through the water flow groove 5111. The depth of the water flow groove 5111 at a position close to the water-oxygen inlet manifold hole 513 and the water-oxygen outlet manifold hole 514 is greater than the depth of the main body of the water flow groove 5111, and an anode metal sheet groove 5112 is provided at this position for embedding the anode metal sheet 53. A main body of the anode sealing slot cavity 5113 is provided on the outer edges of both sides of each main pipe hole and water flow groove 5111 surrounding the anode pole surface 511, and a section of the anode sealing slot cavity 5113 is also provided on the embedded anode metal sheet 53, ultimately forming a connected anode sealing slot cavity 5113 to accommodate the anode sealing line 55.

[0057] See Figure 8 and Fig.10 The cathode surface 512 of the bipolar plate body 51 is provided with an airflow groove 5121, a cathode metal sheet groove 5122 and a cathode sealing groove cavity 5123. The hydrogen outlet manifold hole 515 of the cathode surface 512 is connected with the hydrogen end drainage manifold hole 516 through the airflow groove 5121. The depth of the airflow groove 5121 near the hydrogen outlet manifold hole 515 and the hydrogen end drainage manifold hole 516 is greater than the depth of the main body of the airflow groove 5121, and a cathode metal sheet groove 5122 is provided at this position to embed the cathode metal sheet 52. The main body of the cathode sealing groove cavity 5123 is provided on the outer edges of both sides of each manifold hole and the airflow groove 5121 surrounding the cathode surface 512, and a section of the cathode sealing groove cavity 5123 is also provided on the embedded cathode metal sheet 52, and finally a connected cathode sealing groove cavity 5123 is formed to accommodate the cathode sealing line 54.

[0058] See Figure 5 The lower end monopolar plate assembly 41 is composed of a water flow monopolar plate assembly 411 and a sealing gasket 23. The sealing gasket 23 is attached to the anode surface 511 of the water flow monopolar plate assembly 411, and the main pipe hole of the sealing gasket 23 is correspondingly connected to the non-penetrating depression 41111 (i.e., non-penetrating groove) of the water flow monopolar plate assembly 411.

[0059] See Figure 5 , Figure 7 and Fig. 9 The water flow monopolar plate assembly 411 specifically includes a water flow monopolar plate body 4111, an anode metal sheet 53 and an anode sealing line 55. The structure of the water flow monopolar plate body 4111 is basically the same as that of the bipolar plate body 51, the main difference being that at the position of each main pipe hole of the bipolar plate body 51, the structure of the water flow monopolar plate body 4111 is correspondingly changed into a non-through depression 41111 and its back side is a smooth surface.

[0060] See Figure 5 The upper end hydrogen monopolar plate membrane electrode assembly 43 is composed of a hydrogen monopolar plate assembly 431, a sealing gasket 23 and a membrane electrode 421. The cathode gas diffusion layer 4215 of the membrane electrode 421 is bonded to the cathode electrode surface 512 of the hydrogen monopolar plate assembly 431, one side of the sealing gasket 23 is bonded to the cathode electrode surface 512 of the hydrogen monopolar plate assembly 431, and the other side is bonded to the exposed portion 42131 of the proton exchange membrane 4213, and the cathode gas diffusion layer 4215 is placed in the porous conductive layer limiting hole 231 of the sealing gasket 23. The hydrogen monopolar plate assembly 431, the sealing gasket 23 and the main pipe holes of the membrane electrode 421 are correspondingly connected.

[0061] See Figure 5 , Figure 8 and Fig.10 The hydrogen monopolar plate assembly 431 includes a hydrogen monopolar plate body 4311, a cathode metal sheet 52 and a cathode sealing line 54. The hydrogen monopolar plate body 4311 includes a cathode pole surface 512 including an airflow groove 5121, which can be completely identical to the cathode pole surface 512 of the bipolar plate assembly 5, and the other side thereof is a non-flow channel surface 43111. The non-flow channel surface 43111 is provided with a cathode sealing groove cavity 5123 which is completely identical to the cathode pole surface 512, and the cathode sealing line 54 is packaged in the cathode sealing groove cavity 5123 by line contact.

[0062] See Figure 7 and Figure 8 The anode sealing groove cavity 5113 and the cathode sealing groove cavity 5123, the anode sealing line 55 and the cathode sealing line 54 can have the same structure.

[0063] The above is the specific structure of the proton exchange membrane water electrolyzer 1. In order to facilitate the assembly of the above proton exchange membrane water electrolyzer 1, this solution also provides an assembly device for the proton exchange membrane water electrolyzer, such as Figure 1 and Fig.12As shown, it mainly includes an adjustable press 31, a positioning guide rod 32, a lower pad 33 and an upper pad 35. The adjustable press 31 includes a cylinder 314 and a push plate 316, which is used for assembling the above-mentioned proton exchange membrane water electrolyzer 1. The cylinder 314 is connected to the push plate 316 and drives the push plate 316 to move up and down. The push plate 316 is installed with a lower pad 33, and an upper pad 35 is arranged just above the lower pad 33. The lower pad 33 is used to contact with the lower insulating end plate 25 of the proton exchange membrane water electrolyzer 1, and the upper pad 35 is used to contact with the upper insulating end plate 25 of the proton exchange membrane water electrolyzer 1. 11 contact, the positioning guide rod 32 is vertically arranged and passes through the push plate 316, the side of the proton exchange membrane water electrolyzer 1 and the side of the lower pad 33 are provided with a limiting groove 331 that cooperates with the positioning guide rod 32, and the upper pad 35 is provided with a joint accommodating groove 351 for avoiding the water-oxygen inlet through hole 2111, the water-oxygen outlet through hole 2113, the hydrogen outlet through hole 2112, and the hydrogen end drainage through hole 2114 and enabling them to communicate with the outside, so as to facilitate the installation of joints or other components in the subsequent air tightness detection step and the preliminary test step of electrolysis performance.

[0064] Specifically, Figure 1 and Fig.12 As shown, the proton exchange membrane water electrolyzer 1 is formed by pressing the body section 2 through the assembly device 3. Among them, the end electrical union 21 of the body section 2 is suspended on the upper end sealing plate 317 of the assembly device 3 through the suspension rod 36. The end electrical union 21 of the body section 2 and the lower insulating end plate 25 are respectively fitted with the upper pad 35 of the assembly device 3 and the uppermost of the multiple stacked lower pads 33. In the horizontal direction, the two positioning guide rods 32 of the assembly device 3 are embedded in the limiting grooves 331 on the front and rear sides of each component of the body section 2 to limit the body section 2.

[0065] like Figure 12-14 As shown, the assembly device 3 includes an adjustable press 31, a positioning guide rod 32, a lower pad 33, a fixing bolt 34 and an upper pad 35. The positioning guide rod 32 axially passes through the push plate 316 of the adjustable press 31 and penetrates the upper end sealing plate 317. A plurality of stacked lower pads 33 are placed flat on the push plate 316 of the adjustable press 31, and two positioning guide rods 32 are respectively embedded in the limiting grooves 331 on the front and rear sides of the lower pad 33 to fix their horizontal positions. The fixing bolt 34 passes through the fixing bolt hole 353 of the upper pad 35 and the bolt hole 3171 of the upper end sealing plate 317 to fix the upper pad 35 and the upper end sealing plate 317 together, the upper surface of the upper pad 35 and the lower surface of the upper end sealing plate 317 are fitted, and the limiting grooves 331 on the front and rear sides of the upper pad 35 are embedded in the positioning guide rod 32 for limiting to fix its horizontal position.

[0066] In addition, the distance between the left and right sides of the lower pad 33 is less than the minimum distance between the corresponding assembly bolt holes 2118 on the left and right sides of the lower insulating end plate 25. In addition, the upper pad 35 has joint accommodating grooves 351 on the front and rear sides, and installation process grooves 352 on the left and right sides.

[0067] like Figure 13-14 As shown, the adjustable pressure machine 31 is composed of a connecting rod 311, a fastening nut 312, a lower end sealing plate 313, a cylinder 314, a cylinder support plate 315, a push plate 316, an upper end sealing plate 317 and a pressure regulating table 318. The lower end of the connecting rod 311 is mounted on the lower end sealing plate 313 through the fastening nut 312, and passes through the cylinder support plate 315, the push plate 316 and the upper end sealing plate 317 in sequence, and then the connecting rod 311 is fastened to the upper surface of the upper end sealing plate 317 by the fastening nut 312. The bottom 3141 of the cylinder 314 is fastened to the upper surface of the lower end sealing plate 313 by screws, and the top rod sleeve 3142 of the cylinder 314 is embedded in the cylinder head through hole 3151 of the cylinder support plate 315, so that the top 3143 of the cylinder 314 fits with the lower surface of the cylinder support plate 315. The push rod 3144 of the cylinder 314 extends from the push rod sleeve 3142 and is screwed into the non-penetrating internal thread hole 3162 on the lower surface of the push plate 316 through the external thread 3145. In addition, the lower end sealing plate 313, the cylinder support plate 315, the push plate 316 and the upper end sealing plate 317 are always kept parallel.

[0068] like Fig.14 , a cylinder head through hole 3151 is provided in the middle of the cylinder support plate 315, and connecting through holes 3152 are provided at its four corners. A guide rod limiting through hole 3161 is provided in the push plate 316, and connecting through holes 3152 are provided at its four corners, and a non-through internal threaded hole 3162 is provided in the middle of its lower surface. A guide rod limiting through hole 3161 is provided in the upper end sealing plate 317, and connecting through holes 3152 are provided at its four corners, and two bolt holes 3171 and two suspension rod holes 3172 are provided in the middle. Four connecting rods 311 coaxially pass through the connecting through holes 3152 at the four corners of the cylinder support plate 315, the push plate 316 and the upper end sealing plate 317 respectively; in addition, the two guide rod limiting through holes 3161 of the push plate 316 and the upper end sealing plate 317 coaxially accommodate two positioning guide rods 32.

[0069] like Fig.14 A pressure regulating assembly 3181 is installed on the pressure regulating table 318. The pressure regulating table 318 is placed in front of the cylinder air inlet and outlet 3146 and fixed to the sides of the cylinder support plate 315 and the lower end sealing plate 313. The pressure regulating assembly 3181 is connected to the cylinder air inlet and outlet 3146 through an air pipe.

[0070] The following is a method for manufacturing a proton exchange membrane water electrolyzer 1, which includes an assembly step, an air tightness detection step, and a preliminary electrolysis performance test step, as follows:

[0071] See Figure 2 , Figure 5 , Fig.12 and Fig.15 , the first step is the assembly process of the main body section 2. First, the end electrical complex 21 is hoisted on the upper end sealing plate 317 by a suspension rod 36 so that the end electrical complex 21 is fitted with the upper pad 35. The lower insulating end plate 25 is placed flat on the lower pad 33, and the anode collector plate 24 is placed on the lower insulating end plate 25. Next, the anode porous transport layer 4211 and the cathode gas diffusion layer 4215 moistened with deionized water are respectively adsorbed and placed on the anode pole surface 511 and the cathode pole surface 512 of each plate assembly, and their range is within the porous conductive layer limiting hole 231 of the sealing gasket 23 that is fitted with each plate assembly. On this basis, the components of the plate membrane electrode assembly 4 are stacked in the upper and lower order, and then a sealing gasket 23 and a contact carbon paper 22 are further placed on the non-flow channel surface 43111 of the hydrogen monopolar plate assembly 431, and the contact carbon paper 22 is located in the porous conductive layer limiting hole 231 of the sealing gasket 23. Finally, adjust the pressure regulating assembly 3181 to inflate the cylinder 314, and use the high pressure inside the cylinder 314 to extend the push rod 3144, push the push plate 316 to move upward along the positioning guide rod 32, and press the other components of the main body section 2 tightly against the end electrical union 21.

[0072] See Fig.15 , the second step is the air tightness detection process of the main body section 2. The water-oxygen outlet through hole 2113 and the hydrogen end drainage through hole 2114 of the end electrical combination 21 are sealed with a sealing cover 6, the water-oxygen inlet through hole 2111 is connected to the high-pressure air intake assembly 7, and the hydrogen outlet through hole 2112 is connected to the internal leakage outlet assembly 8. The high-pressure air intake assembly 7 is connected to the high-pressure gas with an air pipe, and the internal leakage outlet assembly 8 is connected to the water through the air pipe. Open the air intake valve 71 of the high-pressure air intake assembly 7, and fill the main body section 2 with high-pressure air. The high-pressure air will enter the water-oxygen inlet main pipe hole 513 from the water-oxygen inlet through hole 2111, and will be guided to the water-oxygen outlet main pipe hole 514 by the water flow groove 5111 of the anode surface 511 of each plate. After that, close the air inlet valve 71 of the high-pressure air inlet assembly 7 and wait for a while. If no bubbles are generated in the air pipe of the internal leakage outlet assembly 8 connected to the water and the pressure gauge 72 on the high-pressure air inlet assembly 7 does not decrease, it means that there is no internal gas leakage from the anode to the cathode in the main body section 2, and there is no leakage from the main body section 2 to the external environment. Therefore, it can be determined that the air tightness requirements of the main body section 2 are met.

[0073] The third step is the preliminary test process of the electrolytic performance of the body section 2. After the air tightness test is completed, there is no need to install the assembly screw 11 and the assembly nut 12, and the preliminary test of the electrolytic performance can be directly performed on the assembly device 3 to determine whether there are defects in the manufacturing process of each component, and the steps are as follows: first, the high-pressure air inlet component 7 at the water-oxygen inlet through hole 2111 is replaced with a water-oxygen water inlet joint 13, and the sealing cover 6 at the water-oxygen outlet through hole 2113 is replaced with a water-oxygen outlet joint 14, and respectively connected to the circulating water inlet pipe and outlet pipe of the water electrolyzer test system, and the internal leakage outlet component 8 at the hydrogen outlet through hole 2112 is replaced with a hydrogen outlet joint 15, and then connected to the hydrogen exhaust pipe of the water electrolyzer test system, and the positive and negative cables of the DC power supply of the water electrolyzer test system are tightly connected to the anode pole ear 241 and the cathode pole ear 2121 of the body section with bolts and nuts. Finally, deionized water is introduced into the anode side of the body section 2, and a direct current is applied to start electrolysis. The total voltage of the electrolytic cell body section 2 under different currents and the partial voltage between adjacent plates are monitored to see whether they are within a reasonable range, and whether the components of the body section 2 are qualified is further confirmed. If there is an abnormality in any component of the body section 2, the cylinder 314 is adjusted to the deflated state, the push plate 316 is lowered, the abnormal component is replaced, and the steps from the first step to the third step are repeated for testing.

[0074] When the preliminary electrolysis performance test of each component of the main body section 2 is qualified, remove the fluid pipelines and cables connected to the main body section 2 of the water electrolyzer test system; remove the suspension rod 36 connecting the end electrical union 21 and the upper end sealing plate 317, and further assemble the screw rod 11 and the assembly nut 12 to fasten the end electrical union 21 and the lower insulating end plate 25; adjust the pressure regulating assembly 3181 to deflate the cylinder 314, and the push plate 316 and the proton exchange membrane water electrolyzer 1 will descend accordingly; take out the positioning guide rod 32, and finally obtain the assembled proton exchange membrane water electrolyzer 1.

[0075] The above are only preferred specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by anyone familiar with the technology within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A proton exchange membrane water electrolyzer, comprising an upper insulating end plate, a cathode collector plate, a contact carbon paper, a plate membrane electrode assembly, an anode collector plate and a lower insulating end plate fastened together by an assembly assembly, the side of the proton exchange membrane water electrolyzer is also provided with a limit groove extending vertically, the plate membrane electrode assembly comprises an upper hydrogen monopolar plate membrane electrode assembly, a plurality of stacked middle section core assemblies, and a lower monopolar plate assembly, the upper hydrogen monopolar plate membrane electrode assembly comprises a hydrogen monopolar plate assembly and a membrane electrode, the middle section core assembly comprises a bipolar plate assembly and a membrane electrode, characterized in that: Sealing gaskets are provided between the upper hydrogen monopolar plate membrane electrode assembly and the adjacent middle section core assembly, between each middle section core assembly, between the lower monopolar plate assembly and the adjacent middle section core assembly, between the hydrogen monopolar plate assembly and the membrane electrode in the upper hydrogen monopolar plate membrane electrode assembly, and between the bipolar plate assembly and the membrane electrode in each middle section core assembly; the limiting groove is square and is not arranged on opposite sides of the proton exchange membrane water electrolyzer.

2. A proton exchange membrane water electrolyzer according to claim 1, characterized in that: A sealing gasket is also provided between the upper insulating end plate and the electrode plate membrane electrode assembly, one side of the sealing gasket is bonded to the non-flow channel surface of the hydrogen monopolar plate assembly, and the other side is bonded to the upper insulating end plate. The contact carbon paper is located in the limiting hole of the porous conductive layer in the middle of the sealing gasket, and is respectively bonded to the non-flow channel surface of the hydrogen monopolar plate assembly and the cathode collector plate.

3. A proton exchange membrane water electrolyzer according to claim 1, characterized in that: One side of the sealing gasket in the upper hydrogen monopolar plate membrane electrode assembly is in contact with the cathode surface of the hydrogen monopolar plate assembly, and the other side is in contact with the exposed portion of the proton exchange membrane in the upper hydrogen monopolar plate membrane electrode assembly; One side of the sealing gasket between the upper hydrogen monopolar plate membrane electrode assembly and the middle section core assembly contacts the exposed portion of the proton exchange membrane of the upper hydrogen monopolar plate membrane electrode assembly, and the other side is in contact with the anode surface of the middle section core assembly; One side of the sealing gasket between the two intermediate section core components is in contact with the anode surface of one of the intermediate section core components, and the other side is in contact with the exposed part of the proton exchange membrane of the other intermediate section core component; One side of the sealing gasket in the middle section core component is in contact with the exposed portion of the proton exchange membrane in the middle section core component, and the other side is in contact with the cathode surface in the middle section core component; One side of the sealing gasket between the middle section core assembly and the lower end monopolar plate assembly contacts the exposed portion of the proton exchange membrane of the middle section core assembly, and the other side is in contact with the anode surface of the lower end monopolar plate assembly; The membrane electrode comprises an anode porous transport layer, an anode catalyst layer, the proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer which are arranged in sequence. The anode porous transport layer and the cathode gas diffusion layer are respectively located in the corresponding porous conductive layer limiting holes in the middle of the sealing gasket.

4. A proton exchange membrane water electrolyzer according to claim 1, characterized in that: The limiting grooves are arranged on both sides of the upper insulating end plate, the electrode plate membrane electrode assembly, the sealing gasket, the anode collector plate and the lower insulating end plate.

5. A proton exchange membrane water electrolyzer according to any one of claims 1 to 4, characterized in that: The upper insulating end plate is provided with a water-oxygen inlet through hole, a water-oxygen outlet through hole, a hydrogen outlet through hole, and a hydrogen end drainage through hole for installing a water-oxygen water inlet joint, a water-oxygen outlet joint, a hydrogen outlet joint, and a hydrogen end drainage joint, respectively. The electrode plate membrane electrode assembly and the sealing gasket are respectively provided with a water-oxygen inlet main pipe hole, a water-oxygen outlet main pipe hole, a hydrogen outlet main pipe hole, and a hydrogen end drainage main pipe hole connected with the water-oxygen inlet through hole, the water-oxygen outlet through hole, the hydrogen outlet through hole, and the hydrogen end drainage through hole. The water-oxygen inlet main pipe hole is connected with the water-oxygen outlet main pipe hole through a water flow groove on the electrode plate membrane electrode assembly or on the anode surface of the lower end monopolar plate assembly, and the hydrogen outlet main pipe hole is connected with the hydrogen end drainage main pipe hole through a gas flow groove on the electrode plate membrane electrode assembly or on the cathode surface of the hydrogen monopolar plate assembly.

6. A proton exchange membrane water electrolyzer according to claim 5, characterized in that: A sealing groove cavity is provided around the lower surface of the upper insulating end plate corresponding to the water-oxygen inlet through hole, the water-oxygen outlet through hole, the hydrogen outlet through hole, and the hydrogen end drainage through hole, and the sealing groove cavity has a sealing line 1 built in; An anode sealing slot cavity is provided on the outer edges of both sides of each main pipe hole surrounding the anode electrode surface and the water flow groove, and a cathode sealing slot cavity is provided on the outer edges of both sides of each main pipe hole surrounding the cathode electrode surface and the air flow groove. The anode sealing slot cavity and the cathode sealing slot cavity are respectively equipped with an anode sealing line and a cathode sealing line.

7. A proton exchange membrane water electrolyzer according to claim 6, characterized in that: The bipolar plate assembly comprises a bipolar plate body, an anode metal sheet, the anode sealing line, a cathode metal sheet, and the cathode sealing line. The bipolar plate body comprises an anode electrode surface and a cathode electrode surface. The anode metal sheet is embedded in the anode metal sheet groove of the anode electrode surface of the bipolar plate body. The cathode metal sheet is embedded in the cathode metal sheet groove of the cathode electrode surface of the bipolar plate body. The water-oxygen inlet manifold hole and the hydrogen outlet manifold hole are arranged on the same side of the bipolar plate body. The water-oxygen outlet manifold hole and the hydrogen end drainage manifold hole are arranged on the same side of the bipolar plate body. The anode surface of the bipolar plate body is provided with a water flow groove, an anode metal sheet groove and an anode sealing groove cavity, the water-oxygen inlet main pipe hole of the anode surface is connected with the water-oxygen outlet main pipe hole through the water flow groove, the depth of the water flow groove at a position close to the water-oxygen inlet main pipe hole and the water-oxygen outlet main pipe hole is greater than the depth of the water flow groove body, and the anode metal sheet groove is opened at a position close to the water-oxygen inlet main pipe hole and the water-oxygen outlet main pipe hole for embedding the anode metal sheet; The cathode surface of the bipolar plate body is provided with an airflow groove, a cathode metal sheet groove and a cathode sealing groove cavity. The hydrogen outlet main pipe hole of the cathode surface is connected with the hydrogen end drainage main pipe hole through the airflow groove. The depth of the airflow groove near the hydrogen outlet main pipe hole and the hydrogen end drainage main pipe hole is greater than the depth of the airflow groove body, and a cathode metal sheet groove is provided near the hydrogen outlet main pipe hole and the hydrogen end drainage main pipe hole for embedding the cathode metal sheet.

8. A proton exchange membrane water electrolyzer according to claim 5, characterized in that: The lower insulating end plate comprises an upper plate, a lower plate and a plurality of springs. A plurality of spring holes are opened in the middle of the facing surfaces of the upper plate and the lower plate, and the springs are placed in the spring holes.

9. An assembly device for a proton exchange membrane water electrolyzer, comprising an adjustable pressure machine, a positioning guide rod, a lower pad and an upper pad, wherein the adjustable pressure machine comprises a cylinder and a push plate, and is characterized in that: It is used for assembling the proton exchange membrane water electrolyzer described in any one of claims 6 to 8, the positioning guide rod corresponds to the shape and position of the limiting groove on the side of the proton exchange membrane water electrolyzer, the cylinder is connected to the push plate and drives the push plate to move up and down, the lower pad is installed on the push plate, the upper pad is arranged just above the lower pad, the lower pad is in contact with the lower insulating end plate of the proton exchange membrane water electrolyzer, the upper pad is in contact with the upper insulating end plate of the proton exchange membrane water electrolyzer, the positioning guide rod is vertically arranged and passes through the push plate, the side of the lower pad is provided with a limiting groove cooperating with the positioning guide rod, and the upper pad is provided with a joint accommodating groove for avoiding the water-oxygen inlet through hole, the water-oxygen outlet through hole, the hydrogen outlet through hole, the hydrogen end drainage through hole and enabling them to communicate with the outside.

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