PEM water electrolyser structure

Abstract

The invention belongs to a PEM water electrolyzer structure in the technical field of electrolyte hydrogen production. The bipolar plate (1) is of a flat plate structure, a through water inlet (2) is formed in one end of the bipolar plate (1), a through water outlet (3) is formed in the other end of the bipolar plate (1), a first diffusion layer (5) is arranged in a pit (4) in one face of the bipolar plate (1), a second diffusion layer (6) is arranged in a pit (4) in the other face of the bipolar plate (1), a plurality of flow channels (7) are formed in the outer side surface of the first diffusion layer (5), and a plurality of flow channels (7) are formed in the outer side surface of the second diffusion layer (6). The outer surface of the first diffusion layer (5) is connected with a first frame (8), the bipolar plate (1) and the corresponding diffusion layer are sintered into an integrated structure, and each frame and the corresponding sealing element are vulcanized into an integrated structure. According to the PEM water electrolyser structure, the bipolar plate and the diffusion layer are sintered into a whole, the structure is simplified, deformation of the diffusion layer is avoided, and meanwhile the problem that the cost of a traditional bipolar plate machining runner is too high is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of electrolyte hydrogen production, and more specifically, relates to a PEM water electrolyzer structure. Background Art

[0002] In recent years, with the increase in investment in the field of hydrogen energy, the industrialization process of hydrogen energy has accelerated, the industry has continued to develop rapidly, and the demand for related industrial chain materials has also increased. The PEM water electrolyzer uses solid proton exchange membrane PEM as electrolyte and pure water as reactant. Due to the low hydrogen permeability of PEM electrolyte, the hydrogen produced is of high purity. Only water vapor needs to be removed, the process is simple, and the safety is high. The electrolyzer adopts a zero-spacing structure with low ohmic resistance, which significantly improves the overall efficiency of the electrolysis process. It is more compact and has a large pressure control range. The hydrogen output pressure can reach several megapascals, which can adapt to the rapidly changing renewable energy power input. Among them, the structural design of the electrolyzer plays a vital role in the overall development of the electrolyzer. The main functions of the bipolar plate are to conduct gas and cooling water (also as a reactant), transmit the conductive electrolyte current and the heat generated by the stack, etc. The diffusion layer is a porous medium between the proton exchange membrane and the bipolar plate. The liquid / gas two-phase fluid is transported to the catalyst layer through the bipolar plate channel, where water is decomposed into electrons, gas and protons at the catalyst anode. The gas flows back to the separator plate through the catalyst layer and the bipolar plate flow channel, and then leaves the electrolyzer. The electrons reach the cathode side through the gas diffusion layer (GDL), the bipolar plate (BPP) and the outside. At the same time, protons reach the cathode through the proton exchange membrane (PEM), where they react with the electrons to produce hydrogen. Then H2 flows through the cathode diffusion layer and leaves the cell. As long as the water flow and electrolysis conditions are maintained, H2 / O2 will continue to be produced. However, the processing cost of existing bipolar plates is high. According to statistics, the material and manufacturing costs of bipolar plates in PEM electrolyzers account for about half of the cost of the entire electrolyzer. Therefore, reducing the manufacturing cost of bipolar plates is one of the important measures to promote the popularization of PEM water electrolysis hydrogen production technology. In addition, the seal of the electrolyzer is the main component of the electrolyzer. The quality of the sealing largely determines the performance of the electrolyzer, which directly affects the safety and reliability of the entire water electrolysis hydrogen production system. However, the sealing performance of ordinary seals is difficult to guarantee. Therefore, how to optimize the structure of the electrolyzer and improve the sealing performance is a problem worth exploring. At present, the flow channel is designed on the bipolar plate, and then the flow channel is manufactured by etching or machining. On the one hand, the existing bipolar plate processing cost is high, and on the other hand, the diffusion layer is often deformed during the assembly of the electrolyzer because the bipolar plate flow channel position has no support, resulting in poor performance of the electrolyzer. In addition, the current PEM electrolyzer is composed of many electrolytic units in series. During assembly, the scattered components are stacked one by one and then clamped with end plates and screws, which makes the structure of the electrolyzer complicated. If there is a problem with one of the components or it is improperly assembled, it will seriously affect the performance of the electrolyzer, resulting in the inability of PEM electrolyzers to develop on a large scale. This is a defect in the current production of PEM electrolyzers.

[0003] The prior art has a technology named "electrolytic cell" and a publication number of "CN116043250A", which includes a cathode end plate, a cathode insulating layer, an electrolytic unit, an anode insulating layer and an anode end plate arranged in sequence, and the electrolytic cell is provided with a first ventilation channel, a second ventilation channel, a first liquid passage and a second liquid passage, and the cross-section of each channel is triangular; from the cathode end plate to the anode end plate, the electrolytic chamber includes a cathode plate, a cathode sealing ring, a cathode gas diffusion layer, a diaphragm, an anode gas diffusion layer and an anode plate arranged in sequence, the cathode plate includes a cathode surface, the anode plate includes an anode surface, the cathode plate and the anode plate in series between the electrolytic chambers constitute a bipolar plate, the cathode surface and the cathode gas diffusion layer constitute a cathode reaction chamber, the anode surface and the anode gas diffusion layer constitute an anode reaction chamber, the first ventilation channel and the first liquid passage are connected to the cathode reaction chamber, and the second ventilation channel and the second liquid passage are connected to the anode reaction chamber; and a flow guide channel is provided in the cathode reaction chamber and the anode reaction chamber.

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a PEM water electrolyzer structure is provided in which the bipolar plate and the diffusion layer are sintered into one, the structure is simplified, the deformation of the diffusion layer is avoided, and the problem of high cost of machining flow channels of traditional bipolar plates is solved.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0007] The present invention discloses a PEM water electrolyzer structure. The bipolar plate is a flat plate structure. A through water inlet is arranged at one end of the bipolar plate, and a through water outlet is arranged at the other end of the bipolar plate. A first diffusion layer is arranged in a pit on one side of the bipolar plate, and a second diffusion layer is arranged in a pit on the other side of the bipolar plate. A plurality of flow channels are arranged on the outer surface of the first diffusion layer, and a plurality of flow channels are arranged on the outer surface of the second diffusion layer. The outer surface of the first diffusion layer is connected to a first frame, and a first seal is arranged between the first frame and the first diffusion layer. The outer surface of the second diffusion layer is connected to a second frame, and a second seal is arranged between the second frame and the second diffusion layer. The bipolar plate and the corresponding diffusion layer are sintered into an integrated structure, and each frame and the corresponding seal are vulcanized into an integrated structure.

[0008] The bipolar plate is a structure made of industrial pure titanium, and the diffusion layer is a structure made of sintered titanium plate.

[0009] A first raised platform is arranged between the pit on one side of the bipolar plate and the water inlet, a second raised platform is arranged between the pit on one side of the bipolar plate and the water outlet, a first raised platform is arranged between the pit on the other side of the bipolar plate and the water inlet, and a second raised platform is arranged between the pit on the other side of the bipolar plate and the water outlet.

[0010] One end of the multi-channel flow channel of the first diffusion layer is connected to the corresponding first raised platform, which is connected to the water inlet, and the other end of the multi-channel flow channel of the first diffusion layer is connected to the corresponding second raised platform, which is connected to the water outlet.

[0011] One end of the multi-channel flow channel of the second diffusion layer is connected to the corresponding first raised platform, which is connected to the water inlet, and the other end of the multi-channel flow channel of the second diffusion layer is connected to the corresponding second raised platform, which is connected to the water outlet.

[0012] An opening is arranged in the middle of the first frame, and a first sealing member is arranged along the edge of the opening. The first sealing member comprises a water inlet sealing member and a water outlet sealing member.

[0013] An opening is arranged in the middle of the second frame, and a second sealing member is arranged along the edge of the opening. The second sealing member comprises a water inlet sealing member and a water outlet sealing member.

[0014] The flow channel on the surface of the first diffusion layer is formed on the surface of the first diffusion layer of the sintered titanium plate with a flat structure by sintering; the flow channel on the surface of the second diffusion layer is formed on the surface of the second diffusion layer of the sintered titanium plate with a flat structure by sintering.

[0015] The depth of the pit on one side of the bipolar plate is equal to the thickness of the first diffusion layer, and the depth of the pit on the other side of the bipolar plate is equal to the thickness of the second diffusion layer.

[0016] The first frame is connected to one side of the bipolar plate through screws, and the second frame is connected to the other side of the bipolar plate through screws.

[0017] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0018] The PEM water electrolyzer structure described in the present invention has a bipolar plate material of industrial pure titanium and a flat titanium plate structure. There is no flow channel structure on the bipolar plate, which avoids the cost increase and material waste caused by mechanical processing. A pit is reserved in the middle for placing sintered titanium felt. A water inlet and a water outlet are designed near the two ends of the bipolar plate. The water inlet and the water outlet are respectively connected to the flow channel on the diffusion layer. A diversion area is set at the flow channel inlet and outlet positions. A raised small round table (raised table portion) is designed in the diversion area to support the corresponding seal. The diffusion layer is suitable for the positive and negative poles of the electrolytic cell. The material of the diffusion layer is a sintered titanium plate. A flow channel is designed on the diffusion layer formed by the sintered titanium plate. One end of the flow channel is connected to the water inlet on the bipolar plate, and the other end of the flow channel is connected to the water outlet on the bipolar plate. The flow channel is designed on the diffusion layer, and then sintered to form a diffusion layer with a flow channel. This design solves the problem of high cost caused by mechanical processing of the flow channel on the traditional bipolar plate. The bipolar plate is only a titanium plate with a water inlet and a water outlet arranged on it. The diffusion layer with a flow channel is distributed and assembled on both sides of the bipolar plate and fixed in the corresponding pit. The water inlet and the water outlet of the diffusion layer are respectively connected with the water inlet and the water outlet of the bipolar plate. The bipolar plate 1 and the structure of the diffusion layer are sintered into one, which simplifies the structure of the electrolytic cell. Each frame is vulcanized and integrated with the corresponding seal. The structure in the prior art includes six components. The present invention simplifies the six components into three components, which greatly optimizes the structure of the electrolytic cell and makes the electrolytic cell simpler and more convenient to assemble. The innovations of the present invention are: 1. The bipolar plate is only a pure titanium plate, and there is no need to machine the flow channel to set the water inlet and the water outlet; 2. The flow channel is designed directly on the diffusion layer; 3. The diffusion layer and the bipolar plate are sintered and integrated; 4. The frame (pole frame) and the seal are vulcanized and integrated; 5. The structure of the electrolytic cell is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 A schematic diagram of the structure of the bipolar plate of the PEM water electrolyzer structure of the present invention;

[0021] Figure 2 A schematic structural diagram of a diffusion layer of a PEM water electrolyzer structure according to the present invention;

[0022] Figure 3 It is a schematic structural diagram of the bipolar plate and the diffusion layer of the PEM water electrolyzer structure of the present invention when they are separated;

[0023] Figure 4 A schematic diagram of the structure of the PEM water electrolyzer structure of the present invention when the bipolar plate and the diffusion layer are connected;

[0024] Figure 5A schematic structural diagram of a sealing member of a PEM water electrolyzer structure according to the present invention;

[0025] Figure 6 It is a schematic structural diagram of the PEM water electrolyzer structure of the present invention when the seal and the frame are connected;

[0026] Figure 7 It is a schematic diagram of the explosion structure of the PEM water electrolyzer structure of the present invention;

[0027] Figure 8 It is a schematic diagram of the explosion structure of the PEM water electrolyzer structure of the present invention;

[0028] Fig. 9 It is a forming flow chart of the PEM water electrolyzer structure of the present invention;

[0029] Markings in the accompanying drawings are: 1, bipolar plate; 2, water inlet; 3, water outlet; 4, pit; 5, first diffusion layer; 6, second diffusion layer; 7, flow channel; 8, first frame; 9, first seal; 10, second frame; 11, second seal; 12, first raised platform; 13, second raised platform; 14, opening; 15, water inlet sealing portion; 16, water outlet sealing portion; 17, seal fluid inlet; 18, seal fluid outlet. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0031] As attached Figure 1 -Attached Figure 8As shown, the present invention is a PEM water electrolyzer structure, the bipolar plate 1 is a flat plate structure, a through water inlet 2 is set at one end of the bipolar plate 1, and a through water outlet 3 is set at the other end of the bipolar plate 1, a first diffusion layer 5 is arranged in a pit 4 on one side of the bipolar plate 1, and a second diffusion layer 6 is arranged in the pit 4 on the other side of the bipolar plate 1, a plurality of flow channels 7 are set on the outer surface of the first diffusion layer 5, and a plurality of flow channels 7 are set on the outer surface of the second diffusion layer 6, the outer surface of the first diffusion layer 5 is connected to a first frame 8, a first seal 9 is set between the first frame 8 and the first diffusion layer 5, the outer surface of the second diffusion layer 6 is connected to a second frame 10, and a second seal 11 is set between the second frame 10 and the second diffusion layer 7, the bipolar plate 1 and the corresponding diffusion layer are sintered into an integrated structure, and each frame and the corresponding seal are vulcanized into an integrated structure. The above structure proposes an improved technical solution for the deficiencies in the prior art. When setting up the structure, the bipolar plate material is industrial pure titanium. The bipolar plate 1 is a flat titanium plate structure. There is no flow channel structure on the bipolar plate 1, which avoids the cost increase and material waste caused by mechanical processing. A pit 4 is reserved in the middle for placing sintered titanium felt. The water inlet 2 and the water outlet 3 are designed near the two ends of the bipolar plate 1. The water inlet 2 and the water outlet 3 are respectively connected to the flow channel on the diffusion layer. A guide area is set at the inlet and outlet of the flow channel. A raised small round table (raised table part) is designed in the guide area to support the corresponding seal. The specific structure of the bipolar plate 1 is shown in Figure 1 , Figure 3 The diffusion layer is suitable for the positive and negative electrodes of the electrolytic cell. The material of the diffusion layer is a sintered titanium plate. A flow channel is designed on the diffusion layer formed by the sintered titanium plate. One end of the flow channel is connected to the water inlet 2 on the bipolar plate 1, and the other end of the flow channel is connected to the water outlet 3 on the bipolar plate 1. Figure 2 , Figure 4 The structure of the diffusion layer shows the flow channel structure clearly. The flow channels are designed on the diffusion layer and then sintered to form a diffusion layer with flow channels. This design solves the problem of high cost caused by machining flow channels on traditional bipolar plates. Figure 5 The exploded view of the bipolar plate and the diffusion layer. The bipolar plate 1 is only a titanium plate with a water inlet and a water outlet set on it. The diffusion layer with flow channels is distributed and assembled on both sides of the bipolar plate 1 and fixed in the corresponding pit 4. The water inlet and water outlet of the diffusion layer are connected to the water inlet 2 and water outlet 3 of the bipolar plate respectively. Figure 6 This is a diagram of the bipolar plate and the diffusion layer being sintered into one. The bipolar plate 1 and the diffusion layer are sintered into one, simplifying the structure of the electrolytic cell. Figure 8It is an assembly diagram of bipolar plates, diffusion layers, frames and seals. The bipolar plate 1 is sintered into an integrated whole with the diffusion layer, and each frame is vulcanized into an integrated whole with the corresponding seal. The structure in the prior art includes six components. The present invention can simplify the original six components into three components, which greatly optimizes the structure of the electrolytic cell and makes the electrolytic cell simpler and more convenient to assemble. The innovation of the present invention is as follows: 1. The bipolar plate is only a piece of pure titanium plate, and there is no need to machine the flow channel, and set the water inlet and outlet; 2. The flow channel is directly designed on the diffusion layer; 3. The diffusion layer and the bipolar plate are sintered into an integrated whole; 4. The frame (polar frame) and the seal are vulcanized into an integrated whole; 5. The structure of the electrolytic cell is effectively simplified. The PEM water electrolyzer structure described in the present invention sinters the bipolar plate 1 and the diffusion layer into one, which has a reliable connection, a simplified structure, and avoids deformation of the diffusion layer. At the same time, it solves the problem of high cost of machining the flow channel of the traditional bipolar plate.

[0032] The bipolar plate 1 is made of industrial pure titanium, and the diffusion layer is made of sintered titanium plate. In the above structure, the diffusion layer is sintered, and the flow channel is designed on the diffusion layer formed by the sintered titanium plate. The flow channel is directly formed during the sintering process, which is simple to manufacture and does not require additional processing.

[0033] A first raised platform 12 is provided between the pit 4 on one side of the bipolar plate 1 and the water inlet 2, a second raised platform 13 is provided between the pit 4 on one side of the bipolar plate 1 and the water outlet 3, a first raised platform 12 is provided between the pit 4 on the other side of the bipolar plate 1 and the water inlet 2, and a second raised platform 13 is provided between the pit 4 on the other side of the bipolar plate 1 and the water outlet 3. In the above structure, the raised platform is located in the guide area at the inlet and outlet of the flow channel, and the raised platform is used to support the corresponding seal to ensure the flatness of the seal so as to reliably play the role of sealing the gap.

[0034] One end of the multi-channel flow channel 7 of the first diffusion layer 5 is connected to the corresponding first raised platform 12, the first raised platform 1 is connected to the water inlet 2, and the other end of the multi-channel flow channel 7 of the first diffusion layer 5 is connected to the corresponding second raised platform 13, and the second raised platform 13 is connected to the water outlet 3. In the above structure, the water inlet 2 and the water outlet 3 are used for water inlet and water outlet, and for cooling water inlet and outlet. The cooling water enters from the water inlet, flows through each flow channel, and then flows out from the water outlet to achieve circulating cooling.

[0035] One end of the multi-channel flow channel 7 of the second diffusion layer 6 is connected to the corresponding first raised platform 12, and the first raised platform 12 is connected to the water inlet 2. The other end of the multi-channel flow channel 7 of the second diffusion layer 6 is connected to the corresponding second raised platform 13, and the second raised platform 13 is connected to the water outlet 3.

[0036] An opening portion 14 is disposed in the middle of the first frame 8 , and a first sealing member 9 is disposed along an edge of the opening portion 14 . The first sealing member 9 includes a water inlet sealing portion 15 and a water outlet sealing portion 16 .

[0037] The second frame 10 is provided with an opening 14 in the middle, the second sealing member 9 is provided along the edge of the opening 14, and the second sealing member 11 comprises an inlet sealing member 15 and an outlet sealing member 16. In the above structure, the inlet sealing member 15 and the outlet sealing member 16 play a sealing role.

[0038] The flow channel 7 on the surface of the first diffusion layer 5 is formed on the surface of the first diffusion layer 5 of the sintered titanium plate of the flat structure by sintering; the flow channel 7 on the surface of the second diffusion layer 6 is formed on the surface of the second diffusion layer 6 of the sintered titanium plate of the flat structure by sintering. In the above structure, the flow channel is designed on the diffusion layer, and then sintered to form a diffusion layer with the flow channel. The flow channel is sintered to form, which solves the problem of high cost caused by machining the flow channel on the traditional bipolar plate.

[0039] The depth of the pit 4 on one side of the bipolar plate 1 is equal to the thickness of the first diffusion layer 5, and the depth of the pit 4 on the other side of the bipolar plate 1 is equal to the thickness of the second diffusion layer 6. In the above structure, each diffusion layer is arranged behind the corresponding pit and does not protrude outside, forming a reliable planar structure.

[0040] The first frame 8 is connected to one side of the bipolar plate 1 by screws, and the second frame 10 is connected to the other side of the bipolar plate 1 by screws. In the above structure, the bolts can reliably connect the frame and the bipolar plate.

[0041] The PEM water electrolyzer structure described in the present invention can greatly reduce the manufacturing cost of the electrolyzer. The flow channel is set on the diffusion layer, which can be processed by powder metallurgy process, formed by mold integration, and then the diffusion layer with the flow channel is sintered on the bipolar plate, and the flow channel and the diffusion layer are integrated. Compared with processing the flow channel on the bipolar plate, the flow channel is formed by mold integration, which effectively reduces the processing cost. The sintering integration of the diffusion layer with the flow channel and the bipolar plate optimizes the structure of the electrolyzer and ensures the stable operation of the electrolyzer. In addition, the seal in the electrolyzer is vulcanized with the pole frame, so that the original four components in the electrolyzer become two. On the one hand, the structure of the electrolyzer is better simplified, and on the other hand, the development of the electrolyzer is greatly promoted. For example: the etching cost of a bipolar plate with an effective area of ​​300cm2 is about 1,000 yuan, and the PVD platinum plating treatment requires 800 yuan. A diffusion layer material with an effective area of ​​300cm2 requires 300 yuan, and the cost of electroplating the diffusion layer is about 500 yuan. In summary, the cost of the bipolar plate and the diffusion layer of a traditional electrolytic cell alone is about 2,600 yuan. The structure and method of the present invention not only eliminates the cost of bipolar plate etching, but also only requires platinum plating once for the combined structure of the bipolar plate and the diffusion layer, with a total cost of about 1,100 yuan, which is more than half the cost.

[0042] Figure 51 is a schematic diagram of the seal structure, including a seal fluid inlet 17 and a seal fluid outlet 18. The seal fluid inlet 17 and the seal fluid outlet 18 are used for fluid to pass through.

[0043] The PEM water electrolyzer structure described in the present invention uses industrial pure titanium as the bipolar plate material. The bipolar plate 1 is a flat titanium plate structure. There is no flow channel structure on the bipolar plate 1, and there is no need to process the flow channel separately on the bipolar plate 1, which avoids the cost increase and material waste caused by mechanical processing. A pit 4 is reserved in the middle for placing sintered titanium felt. An inlet 2 and an outlet 3 are designed near both ends of the bipolar plate 1. The inlet 2 and the outlet 3 are respectively connected to the flow channel on the diffusion layer. A guide area is set at the inlet and outlet of the flow channel. A raised platform is designed in the guide area to support the corresponding seal. The specific structure of the bipolar plate 1 is shown in FIG. Figure 1 , Figure 3 The diffusion layer is suitable for the positive and negative electrodes of the electrolytic cell. The material of the diffusion layer is a sintered titanium plate. A flow channel is designed on the diffusion layer formed by the sintered titanium plate. One end of the flow channel is connected to the water inlet on the bipolar plate 1, and the other end of the flow channel is connected to the water outlet 3 on the bipolar plate 1. Figure 2 , Figure 4 The structure of the diffusion layer shows the flow channel structure clearly. The flow channels are designed on the diffusion layer and then sintered to form a diffusion layer with flow channels. This design solves the problem of high cost caused by machining flow channels on traditional bipolar plates. Figure 5 The exploded view of the bipolar plate and the diffusion layer. The bipolar plate 1 is only a titanium plate with a water inlet and a water outlet set on it. The diffusion layer with flow channels is distributed and assembled on both sides of the bipolar plate 1 and fixed in the corresponding pit 4. The water inlet and water outlet of the diffusion layer are connected to the water inlet 2 and water outlet 3 of the bipolar plate respectively. Figure 6 This is a diagram of the bipolar plate and the diffusion layer being sintered into one. The bipolar plate 1 and the diffusion layer are sintered into one, simplifying the structure of the electrolytic cell. Figure 8 The assembly diagram of the bipolar plate, diffusion layer, frame and seal is shown in FIG. Each frame is integrated with the corresponding seal by vulcanization. The structure in the prior art includes six components. The present invention can simplify the original six components into three components, greatly optimizing the structure of the electrolytic cell and making the electrolytic cell simpler and more convenient to assemble. The innovations of the present invention are: 1. The bipolar plate is only a piece of pure titanium plate, and there is no need to machine the flow channel and set the water inlet and outlet; 2. The flow channel is designed directly on the diffusion layer; 3. The diffusion layer and the bipolar plate are sintered and integrated; 4. The frame and the corresponding seal are vulcanized and integrated; 5. The structure of the electrolytic cell is effectively simplified.

[0044] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A PEM water electrolyzer structure, characterized in that: The bipolar plate (1) is a flat plate structure. A through water inlet (2) is provided at one end of the bipolar plate (1), and a through water outlet (3) is provided at the other end of the bipolar plate (1). A first diffusion layer (5) is arranged in a recess (4) on one side of the bipolar plate (1), and a second diffusion layer (6) is arranged in a recess (4) on the other side of the bipolar plate (1). A plurality of flow channels (7) are provided on the outer surface of the first diffusion layer (5), and a plurality of flow channels (7) are provided on the outer surface of the second diffusion layer (6). The outer surface of the first diffusion layer (5) is connected to a first frame (8), a first sealing member (9) is provided between the first frame (8) and the first diffusion layer (5), and the outer surface of the second diffusion layer (6) is connected to the second frame (10). A second sealing member (11) is arranged between the second frame (10) and the second diffusion layer (7); the bipolar plate (1) and the corresponding diffusion layer are sintered into an integral structure; each frame and the corresponding sealing member are vulcanized into an integral structure; a first raised platform (12) is arranged between the recess (4) and the water inlet (2) on one side of the bipolar plate (1); a second raised platform (13) is arranged between the recess (4) and the water outlet (3) on one side of the bipolar plate (1); a first raised platform (12) is arranged between the recess (4) and the water inlet (2) on the other side of the bipolar plate (1); and a second raised platform (13) is arranged between the recess (4) and the water outlet (3) on the other side of the bipolar plate (1).

2. The PEM water electrolyzer structure according to claim 1, characterized in that: The bipolar plate (1) is a structure made of industrial pure titanium, and the diffusion layer is a structure made of sintered titanium plate.

3. The PEM water electrolyzer structure according to claim 1 or 2, characterized in that: One end of the multi-channel flow channel (7) of the first diffusion layer (5) is connected to the corresponding first raised platform (12), the first raised platform (1) is connected to the water inlet (2), and the other end of the multi-channel flow channel (7) of the first diffusion layer (5) is connected to the corresponding second raised platform (13), and the second raised platform (13) is connected to the water outlet (3).

4. The PEM water electrolyzer structure according to claim 1 or 2, characterized in that: One end of the multi-channel flow channel (7) of the second diffusion layer (6) is connected to the corresponding first raised platform (12), and the first raised platform (12) is connected to the water inlet (2); the other end of the multi-channel flow channel (7) of the second diffusion layer (6) is connected to the corresponding second raised platform (13), and the second raised platform (13) is connected to the water outlet (3).

5. The PEM water electrolyzer structure according to claim 1 or 2, characterized in that: An opening (14) is arranged in the middle of the first frame (8), and a first sealing member (9) is arranged along the edge of the opening (14). The first sealing member (9) comprises a water inlet sealing member (15) and a water outlet sealing member (16).

6. The PEM water electrolyzer structure according to claim 5, characterized in that: An opening (14) is arranged in the middle of the second frame (10), a second sealing member (9) is arranged along the edge of the opening (14), and the second sealing member (11) comprises a water inlet sealing member (15) and a water outlet sealing member (16).

7. The PEM water electrolyzer structure according to claim 1 or 2, characterized in that: The flow channel (7) on the surface of the first diffusion layer (5) is formed on the surface of the first diffusion layer (5) of the sintered titanium plate with a flat structure by sintering; and the flow channel (7) on the surface of the second diffusion layer (6) is formed on the surface of the second diffusion layer (6) of the sintered titanium plate with a flat structure by sintering.

8. The PEM water electrolyzer structure according to claim 1 or 2, characterized in that: The depth of the pit (4) on one side of the bipolar plate (1) is equal to the thickness of the first diffusion layer (5), and the depth of the pit (4) on the other side of the bipolar plate (1) is equal to the thickness of the second diffusion layer (6).

9. The PEM water electrolyzer structure according to claim 1 or 2, characterized in that: The first frame (8) is connected to one side of the bipolar plate (1) via screws, and the second frame (10) is connected to the other side of the bipolar plate (1) via screws.

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