Proton exchange membrane water electrolyzer and electrolysis system

Abstract

The utility model discloses a proton exchange membrane water electrolyzer and an electrolysis system, the proton exchange membrane water electrolyzer comprises a bipolar plate, and the bipolar plate comprises an anode plate and a cathode plate which are oppositely arranged; the front face of the anode plate and the front face of the cathode plate are concaved inwards to form an anode sealing groove used for containing an anode sealing ring and a cathode sealing groove used for containing a cathode sealing ring respectively, and the anode sealing groove and the cathode sealing groove are symmetrically arranged relative to the butt joint face of the anode plate and the cathode plate. And the back surfaces of the anode plate and the cathode plate are welded or glued together. According to the proton exchange membrane water electrolyser provided by the utility model, the risk of deformation of the anode plate and the cathode plate in the assembly process can be reduced, so that the risk of deformation of the sealing ring is reduced, and the sealing performance of the sealing ring of the proton exchange membrane water electrolyser is ensured.

Description

Technical Field

[0001] This utility model relates to the field of water electrolysis technology, specifically to a proton exchange membrane water electrolyzer and electrolysis system. Background Technology

[0002] Proton exchange membrane electrolysis technology has high current density, low energy consumption, high hydrogen production pressure, small electrolyzer volume, flexible operation, and is conducive to rapid load changes, making it a suitable solution for hydrogen production by water electrolysis.

[0003] A proton exchange membrane (PEM) water electrolyzer typically has upper and lower end plates. These end plates are connected by a stack of multiple individual electrolyzer cells arranged in series, maintaining the stacking pressure. The bipolar plate is the core component of the PEM water electrolyzer. It not only supports the diffusion layer but also conducts reactants and products, as well as the electrolytic current and heat generated by the stack, directly affecting the efficiency and stability of the electrolyzer.

[0004] In existing bipolar plate structure designs, the sealing grooves on both sides of the bipolar plate are asymmetrically arranged. When the sealing ring is placed in the asymmetrical sealing groove and subjected to high pressure, the bipolar plate is prone to shearing and breakage due to uneven stress. Moreover, the sealing ring is also prone to displacement during the high-pressure process, resulting in poor sealing performance.

[0005] If the sealing groove is first formed by assembling the electrode frame (the electrode frame can be an independent electrode frame or an injection-molded electrode frame), and then the assembled sealing groove is placed on the surface of the bipolar plate, and finally the sealing ring is placed in the sealing groove, although the sealing grooves on both sides of the bipolar plate can be symmetrically arranged, both injection-molded and independent electrode frames are made of rigid engineering plastics. Under high pressure, the electrode frames will also have problems such as bending, displacement, deformation and breakage, which will lead to the displacement of the sealing ring and ultimately result in poor sealing effect of the sealing ring.

[0006] In view of the above shortcomings, it is necessary to design a new proton exchange membrane water electrolyzer and electrolysis system. Utility Model Content

[0007] Therefore, the technical problem to be solved by this utility model is that the sealing effect of the sealing ring of the proton exchange membrane water electrolyzer in the prior art is poor, thereby providing a proton exchange membrane water electrolyzer and electrolysis system.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0009] A proton exchange membrane water electrolyzer includes bipolar plates, each including an anode plate and a cathode plate disposed opposite to each other. The front sides of the anode plate and the cathode plate are respectively partially recessed to form an anode sealing groove for placing an anode sealing ring and a cathode sealing groove for placing a cathode sealing ring. The anode sealing groove and the cathode sealing groove are symmetrically arranged about the mating surfaces of the anode plate and the cathode plate. The back sides of the anode plate and the cathode plate are welded or glued together.

[0010] Furthermore, the anode sealing groove and the cathode sealing groove are respectively symmetrically arranged about the centerline of the bipolar plate in the length direction and about the centerline of the bipolar plate in the width direction.

[0011] Furthermore, the bipolar plate is provided with a water inlet channel, a water oxygen outlet channel, and a hydrogen outlet channel. The anode plate and the cathode plate are welded to form multiple welding lines or glued to form multiple glue lines. All of the welding lines or glue lines are closed lines. The water inlet channel, the water oxygen outlet channel, and the hydrogen outlet channel are separated by the welding lines or glue lines.

[0012] Furthermore, the front side of the anode plate is partially recessed inward to form an anode reaction zone, and the front side of the cathode plate is partially recessed inward to form a cathode reaction zone.

[0013] The water inlet channel includes a water inlet, a water inlet guide hole, and a water inlet guide groove connected in sequence. The water inlet penetrates the two opposite surfaces of the bipolar plate. The water inlet is located outside the water inlet guide groove, and the water inlet guide groove is located within the anode reaction zone.

[0014] The oxygen outlet channel includes an oxygen outlet, an oxygen guide hole, and an oxygen guide groove connected in sequence. The oxygen outlet penetrates the two opposite surfaces of the bipolar plate. The oxygen outlet is located outside the oxygen guide groove. The oxygen guide groove is located within the anode reaction zone.

[0015] There are two hydrogen outlet channels, each including a hydrogen outlet port, a hydrogen outlet guide hole, and a hydrogen outlet guide groove connected in sequence. The hydrogen outlet port penetrates the two opposite surfaces of the bipolar plate, and the hydrogen outlet port is located outside the hydrogen outlet guide groove. The hydrogen outlet guide groove is located within the cathode reaction zone.

[0016] Furthermore, the two hydrogen outlet channels are located at two opposite corners of the bipolar plate, and the water inlet channel and the oxygen outlet channel are located at the other two opposite corners of the bipolar plate.

[0017] Furthermore, the water inlet and the oxygen outlet are symmetrically positioned, and the two hydrogen outlets are also symmetrically positioned.

[0018] Furthermore, the cross-sectional shape and size of the water inlet, the oxygen outlet, and the hydrogen outlet are the same.

[0019] Furthermore, it also includes a diffusion layer and a proton exchange membrane, both of which are disposed between the anode plate and the cathode plate.

[0020] Furthermore, the bipolar plate is provided with a first positioning hole and a second positioning hole at a distance, and in the thickness direction of the bipolar plate, the first positioning hole and the second positioning hole respectively penetrate the two opposite surfaces of the bipolar plate.

[0021] The technical solution of this utility model has the following advantages:

[0022] 1. The proton exchange membrane water electrolyzer provided by this utility model has symmetrically arranged anode and cathode sealing grooves, which are located on the front of the anode plate and cathode plate respectively. Therefore, during the assembly process, the anode plate and cathode plate are subjected to relatively balanced forces and are not easily deformed. This reduces the impact of deformation of the anode plate and cathode plate on the sealing performance of the sealing ring. Furthermore, since the anode plate and cathode plate are welded or glued together, no large external force is required on the anode plate and cathode plate during assembly. This avoids problems such as bending, displacement, deformation, and breakage of the anode plate and cathode plate under high pressure, which can lead to the displacement of the sealing ring and ultimately ensure the sealing effect of the sealing ring.

[0023] 2. The proton exchange membrane water electrolyzer provided by this utility model has an anode sealing groove and a cathode sealing groove that are symmetrically arranged about the centerline of the bipolar plate in the length direction and about the centerline of the bipolar plate in the width direction, respectively. This can further improve the balance of force on the anode plate and cathode plate during assembly.

[0024] 3. The proton exchange membrane water electrolyzer provided by this utility model has an inlet water channel, an outlet oxygen channel, and an outlet hydrogen channel on the bipolar plates. The anode plate and the cathode plate are welded to form multiple welding lines or glued to form multiple glued lines. All welding lines or glued lines are closed lines. The inlet water channel, the outlet oxygen channel, and the outlet hydrogen channel are separated by welding lines or glued lines, which can improve the safety of electrolysis operation.

[0025] 4. The proton exchange membrane water electrolyzer provided by this utility model has a centrally symmetrical inlet and outlet oxygen port, which is conducive to water flow and oxygen discharge. The centrally symmetrical hydrogen outlet can improve the hydrogen discharge rate. Furthermore, the centrally symmetrical inlet and outlet oxygen port, as well as the centrally symmetrical hydrogen outlet, can further improve the balance of force on the anode plate and cathode plate during assembly.

[0026] 5. The proton exchange membrane water electrolyzer provided by this utility model has a first positioning hole and a second positioning hole spaced apart on the bipolar plate. In the thickness direction of the bipolar plate, the first positioning hole and the second positioning hole respectively penetrate the two opposite surfaces of the bipolar plate, which can improve the positioning accuracy and assembly efficiency of the proton exchange membrane water electrolyzer.

[0027] A proton exchange membrane water electrolysis system includes the aforementioned proton exchange membrane water electrolysis cell.

[0028] The technical solution of this utility model has the following advantages:

[0029] The proton exchange membrane water electrolysis system provided by this invention has all the advantages of the aforementioned proton exchange membrane water electrolyzer. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional exploded view of the proton exchange membrane water electrolyzer in an embodiment of this utility model;

[0032] Figure 2 This is a front view of the anode plate of the proton exchange membrane water electrolyzer in an embodiment of this utility model;

[0033] Figure 3 This is a front view of the cathode plate of the proton exchange membrane water electrolyzer in an embodiment of this utility model;

[0034] Figure 4 This is a partially enlarged schematic diagram of the bipolar plate of the proton exchange membrane water electrolyzer in an embodiment of this utility model;

[0035] Figure 5 This is a schematic diagram of the back of the anode plate of the proton exchange membrane water electrolyzer in an embodiment of this utility model;

[0036] Figure 6 This is a schematic diagram of the back of the cathode plate of the proton exchange membrane water electrolyzer in an embodiment of this utility model;

[0037] Figure 7 This is a schematic diagram of the back of the anode plate with grooves in the proton exchange membrane water electrolyzer in an embodiment of this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Bipolar plate; A. Anode plate; B. Cathode plate; 2. Inlet; 3. Oxygen outlet; 4. Hydrogen outlet; 5. Anode reaction zone; 6. Cathode reaction zone; 7. Inlet guide channel; 8. Oxygen outlet guide channel; 9. Hydrogen outlet guide channel; 10. Anode sealing groove; 11. Cathode sealing groove; 12. First positioning hole; 13. Second positioning hole; 14. Inspection terminal; 15. Inlet guide hole; 16. Oxygen outlet guide hole; 17. Hydrogen outlet guide hole; 18. Welding line; 19. Groove; 20. Sealing ring; 200. Anode sealing ring; 201. Cathode sealing ring; 21. Diffusion layer; 22. Proton exchange membrane. Detailed Implementation

[0040] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0044] Example 1

[0045] like Figures 1 to 7As shown, this embodiment provides a proton exchange membrane water electrolyzer (hereinafter referred to as the electrolyzer). The proton exchange membrane water electrolyzer includes a bipolar plate 1. The bipolar plate 1 is provided with an inlet 2, an outlet oxygen 3, an outlet hydrogen 4, an anode reaction zone 5, a cathode reaction zone 6, an inlet guide channel 7, an outlet oxygen guide channel 8, an outlet hydrogen guide channel 9, an inlet guide hole 15, an outlet oxygen guide hole 16, an outlet hydrogen guide hole 17, an anode sealing groove 10, a cathode sealing groove 11, a first positioning hole 12, a second positioning hole 13, and an inspection terminal 14.

[0046] like Figure 1 The diagram shows a three-dimensional exploded view of an electrolysis unit in an electrolytic cell. An electrolysis unit includes two bipolar plates 1, a diffusion layer 21, a sealing ring 20, and a proton exchange membrane 22 with a catalyst layer. The two opposing surfaces of the metal diffusion layer 21 (usually titanium felt) are welded to the anode and cathode surfaces of the bipolar plates 1, respectively, to form a single unit with the bipolar plates 1. This reduces the assembly steps and time of the electrolytic cell, prevents misalignment of the diffusion layer 21 during assembly, and lowers the contact resistance of the electrolytic cell, thereby improving its operating performance. It should be noted that the diffusion layer 21 and the proton exchange membrane 22 are existing technologies and will not be described in detail here. The bipolar plates 1 include an anode plate A and a cathode plate B arranged opposite each other. The bipolar plates 1 also have inspection terminals 14, which have through holes (such as...). Figure 3 and Figure 4 (As shown, not labeled). Inspection terminal 14 is used to connect external components, such as voltage testing components, to test the operating performance of each electrolysis unit and to detect faults in the electrolytic cell. Inspection terminal 14 can be integrally formed with bipolar plate 1 and extend outward from bipolar plate 1, or it can be formed separately and then welded together with bipolar plate 1.

[0047] The front side of the anode plate A is partially recessed inward to form an anode reaction zone 5, which is suitable for any flow field.

[0048] An inlet guide channel 7 is set at one corner of the anode reaction zone 5, and an outlet oxygen guide channel 8 is set at the other corner of the anode reaction zone 5. The inlet guide channel 7 and the outlet oxygen guide channel 8 are set diagonally opposite each other. In the direction from the center of the bipolar plate 1 towards the edge, the inlet 2 and the outlet oxygen 3 are located outside the inlet guide channel 7 and the outlet oxygen guide channel 8, respectively. The size of the inlet 2 in the bipolar plate 1 can be determined according to actual needs and is not specifically limited here. Generally, the larger the inlet 2, the more conducive it is to the uniform distribution of water flow in the anode reaction zone 5.

[0049] A cathode reaction region 6 is provided with a partial inward recess on the front side of the cathode plate B, which is also suitable for any flow field. The dimensions of the anode reaction region 5 and the cathode reaction region 6 in the thickness direction of the bipolar plate 1 are 0.3 mm to 1 mm.

[0050] Two hydrogen outlet channels 9 are provided at two diagonal positions of the cathode reaction zone 6. Two hydrogen outlets 4 are located outside the two hydrogen outlet channels 9 in the direction from the center of the bipolar plate 1 to the edge.

[0051] Water inlet 2 and hydrogen outlet 4 are located on the same side of bipolar plate 1, as are water oxygen outlet 3 and another hydrogen outlet 4. With the center point of bipolar plate 1 as the symmetry point, water inlet 2 and water oxygen outlet 3 are centrally symmetrical, which facilitates water flow and oxygen discharge. The two hydrogen outlets 4 are centrally symmetrical, which increases the hydrogen discharge rate. The central symmetry of water inlet 2 and water oxygen outlet 3, as well as the central symmetry of the two hydrogen outlets 4, and the identical cross-sectional shape and size of water inlet 2, water oxygen outlet 3, and hydrogen outlet 4, improves the balance of forces on anode plate A and cathode plate B during assembly. Water inlet 2, water oxygen outlet 3, and hydrogen outlet 4 each penetrate two opposite surfaces of bipolar plate 1, with each of the two orifices located on anode plate A and cathode plate B, respectively. The inlet 2, the oxygen outlet 3, and the hydrogen outlet 4 can be square, circular, trapezoidal, or triangular. A square design makes the structure of the bipolar plate 1 more compact. The inlet 2 and the oxygen outlet 3 are located at opposite corners of the bipolar plate 1. As water flows from the inlet 2 to the oxygen outlet 3, the uniformity of water distribution is further improved. The two hydrogen outlets 4 are located at the other two opposite corners of the bipolar plate 1. Both hydrogen outlets 4 are independent of the inlet 2 and the oxygen outlet 3, so that the hydrogen outlets 4, the inlet 2, and the oxygen outlet 3 do not affect each other, and also make the structure of the bipolar plate 1 more compact.

[0052] The inlet 2 is connected to the inlet guide channel 7 in the anode reaction zone 5 through multiple inlet guide holes 15 (located on the anode plate A), which guides the water flowing in from the inlet 2 into the inlet guide channel 7, and then distributes it evenly within the anode reaction zone 5. The outlet oxygen 3 is connected to the outlet oxygen guide channel 8 in the anode reaction zone 5 through multiple outlet oxygen guide holes 16 (located on the anode plate A). Oxygen generated by the electrochemical reaction in the anode reaction zone 5 and unreacted water are discharged from the outlet oxygen guide channel 8 through the outlet oxygen guide holes 16 and outlet oxygen 3. The outlet hydrogen 4 is connected to the outlet hydrogen guide channel 9 in the cathode reaction zone 6 through multiple outlet hydrogen guide holes 17 (located on the cathode plate B). Hydrogen generated by the electrochemical reaction in the cathode reaction zone 6 flows to both ends of the cathode reaction zone 6, and is then discharged through the outlet hydrogen guide channel 9, outlet hydrogen guide holes 17, and outlet hydrogen 4.

[0053] The inlet water guide hole 15, the outlet oxygen guide hole 16, and the outlet hydrogen guide hole 17 are all composed of several channels of uniform size extending along the thickness direction of the bipolar plate 1. Of course, the size of the channels can also be non-uniform. The channels can be set vertically or not. The overall width of the multiple inlet water guide holes 15, multiple outlet oxygen guide holes 16, and multiple outlet hydrogen guide holes 17 is the same as the width of the inlet water guide channel 7, the outlet oxygen guide channel 8, and the outlet hydrogen guide channel 9, respectively.

[0054] An anode sealing groove 10 is formed by a partial inward recess on the front side of the anode plate A, and a cathode sealing groove 11 is formed by a partial inward recess on the front side of the cathode plate B. The projections of the cathode sealing groove 11 and the anode sealing groove 10 on the horizontal plane coincide, meaning that the anode sealing groove 10 and the cathode sealing groove 11 are symmetrically arranged about the mating surfaces of the anode plate A and the cathode plate B. Furthermore, the anode sealing groove 10 and the cathode sealing groove 11 are symmetrically arranged about the centerline of the bipolar plate 1 in the length direction and about the centerline of the bipolar plate 1 in the width direction, respectively. This improves the balance of forces on the anode plate A and the cathode plate B during assembly. The cross-sections of the anode sealing groove 10 and the cathode sealing groove 11 can be rectangular, trapezoidal, or triangular; preferably, the cross-sections of the anode sealing groove 10 and the cathode sealing groove 11 are rectangular. The anode sealing groove 10 and the cathode sealing groove 11 are both continuous and are respectively arranged around the outside of the water inlet 2, the oxygen outlet 3, the hydrogen outlet 4, the anode reaction zone 5, and the cathode reaction zone 6. This not only isolates the reaction zone (the reaction zone being a collective term for the anode reaction zone 5 and the cathode reaction zone 6) from the outside, but also completely separates the reaction zone from the inlet and outlet ports of each substance (the inlet and outlet ports being a collective term for the water inlet 2, the oxygen outlet 3, and the hydrogen outlet 4). The sealing ring 20 (such as...) Figure 1As shown, the sealing rings 20 (a collective term for the anode sealing ring 200 and the cathode sealing ring 201) are arranged in symmetrical sealing grooves (a collective term for the anode sealing groove 10 and the cathode sealing groove 11) and subjected to high-pressure treatment. During this process, each layer of sealing rings is completely fitted together. Due to the uniform stress between the symmetrical sealing grooves, the sealing rings 20 reduce the risk of bending, deformation, and breakage of the anode plate A and / or the cathode plate B, thereby reducing the risk of displacement of the sealing rings 20 during high-pressure processing. This ultimately results in better sealing performance of the sealing rings, ensuring the safe operation of the electrolytic cell. In this embodiment, the depth of the sealing grooves is 0.2 mm to 1.5 mm, and the width of the sealing grooves is 5 mm to 10 mm. In this embodiment, the material of the sealing rings is a thermoplastic elastomer with elasticity, such as rubber. A first positioning hole 12 is provided on the bipolar plate 1 between the water inlet 2 and the hydrogen outlet 4 on the left side. One opening of the first positioning hole 12 is located on the anode plate A, and the other opening is located on the cathode plate B. A second positioning hole 13 is provided on the bipolar plate 1 between the oxygen outlet 3 and the hydrogen outlet 4 on the right side. One opening of the second positioning hole 13 is located on the anode plate A, and the other opening is located on the cathode plate B. The positioning holes (the positioning holes are a collective term for the first positioning hole 12 and the second positioning hole 13) are used to facilitate the alignment between the bipolar plates 1 to be stacked during the assembly of the electrolyzer, thus effectively improving the positioning accuracy and assembly efficiency of the electrolyzer. Of course, the first positioning hole 12 and the second positioning hole 13 can also be set in other positions.

[0055] The materials used in the anode plate A and the cathode plate B are either titanium or titanium alloys. These materials have the advantages of being lightweight, high-strength, and corrosion-resistant, which allows the bipolar plate 1 to withstand high pressure without deformation during operation, thereby further ensuring the sealing effect.

[0056] In this embodiment, the anode plate A and cathode plate B are formed by etching and machining. Of course, other suitable processing methods can also be used, and no specific limitation is made here; the choice can be made according to actual needs. A plating layer is also applied to the surface of the bipolar plate 1 to protect it and slow down the rate of corrosion during the electrochemical reaction. The plating layer can be made of gold, platinum, or a gold-platinum composite material, enabling the bipolar plate 1 to maintain excellent corrosion resistance in the strongly acidic environment of the electrolytic cell, improving its service life, and reducing the possibility of seal failure.

[0057] In this embodiment, the aforementioned anode plate A and cathode plate B are welded together, resulting in good welding performance, high rigidity, and good overall integrity. The welded bipolar plate 1 has the advantages of high strength, high assembly efficiency, and high sealing performance, which can improve the safety of the bipolar plate 1 under high pressure. Furthermore, Figure 5The dashed lines shown represent weld lines 18 formed by the welding process. Four rectangular frames formed by the four closed weld lines 18 enclose the following: one frame surrounds the inlet 2, inlet guide hole 15, and inlet guide channel 7; another frame surrounds the outlet oxygen port 3, outlet oxygen guide hole 16, and outlet oxygen guide channel 8; one frame surrounds the left-side hydrogen outlet 4, hydrogen guide hole 17, and hydrogen guide channel 9; and one frame surrounds the right-side hydrogen outlet 4, hydrogen guide hole 17, and hydrogen guide channel 9. The rectangular frame not only welds the anode plate A and the cathode plate B together to form a single bipolar plate 1, but also isolates the water inlet channel (water inlet 2, water inlet guide hole 15, and water inlet guide groove 7 connected together to form the water inlet channel), the oxygen outlet channel (oxygen outlet 3, oxygen outlet guide hole 16, and oxygen outlet guide groove 8 connected together to form the oxygen outlet channel), and the hydrogen outlet channel (hydrogen outlet 4, hydrogen outlet guide hole 17, and hydrogen outlet guide groove 9 connected together to form the hydrogen outlet channel), thereby improving the safety of the electrolysis operation.

[0058] Of course, the aforementioned anode plate A and cathode plate B can also be connected together by gluing, specifically, as shown below. Figure 7 As shown, grooves 19 for applying adhesive are formed on the back of the anode plate A around the inlet water channel, outlet oxygen channel, and outlet hydrogen channel. The width of the grooves 19 is 1mm to 5mm, and the depth of the grooves 19 is 0.1mm to 0.5mm. Metal adhesive (such as epoxy resin adhesive or silicone adhesive) is applied to the four grooves 19. Then, the anode plate A and cathode plate B are bonded together. A strong connection is then formed between the anode plate A and cathode plate B through curing and heat treatment. The aforementioned curing and heat treatment methods are existing technologies and will not be described in detail here. The bonded area forms an adhesive line. Using metal adhesives for bonding can be completed at room temperature and low pressure, thus reducing the process flow and production costs. Bonding also avoids the problems of heat deformation and stress concentration caused by welding. The strength and sealing performance of bonding using metal adhesives are also excellent, reducing leakage problems and improving the reliability and safety of the equipment. Furthermore, metal adhesives usually have a certain degree of corrosion resistance. The adhesive bonding method between the anode plate A and the cathode plate B can also increase the proportion of the active area in the area of ​​the bipolar plate 1, making the bipolar plate 1 more compact and reducing material costs.

[0059] In this embodiment, the anode plate A and cathode plate B are welded or glued together. During assembly, no large external force is required on the anode plate A and cathode plate B. This avoids problems such as bending, displacement, deformation and breakage of the anode plate A and cathode plate B under high pressure, which would cause the sealing ring 20 to shift. Ultimately, this ensures the sealing effect of the sealing ring 20. Furthermore, since the anode plate A and cathode plate B are designed and processed separately, the anode sealing groove 10 and the cathode sealing groove 11 can be designed symmetrically, thereby ensuring that the anode sealing ring 200 and the cathode sealing ring 201 are completely fitted together, further ensuring the sealing effect of the sealing ring 20.

[0060] Example 2

[0061] This embodiment provides a proton exchange membrane water electrolysis system, including the proton exchange membrane water electrolyzer of Embodiment 1 (such as...). Figures 1 to 7 (As shown).

[0062] The proton exchange membrane water electrolysis system in this embodiment has all the advantages of the proton exchange membrane water electrolyzer in Example 1.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A proton exchange membrane water electrolyzer, characterized in that, The bipolar plate (1) includes an anode plate (A) and a cathode plate (B) disposed opposite to each other. The front sides of the anode plate (A) and the cathode plate (B) are respectively partially recessed to form an anode sealing groove (10) for placing an anode sealing ring (200) and a cathode sealing groove (11) for placing a cathode sealing ring (201). The anode sealing groove (10) and the cathode sealing groove (11) are symmetrically arranged about the mating surfaces of the anode plate (A) and the cathode plate (B). The back sides of the anode plate (A) and the cathode plate (B) are welded or glued together.

2. The proton exchange membrane water electrolyzer according to claim 1, characterized in that, The anode sealing groove (10) and the cathode sealing groove (11) are respectively symmetrically arranged about the centerline of the bipolar plate (1) in the length direction and about the centerline of the bipolar plate (1) in the width direction.

3. The proton exchange membrane water electrolyzer according to claim 1, characterized in that, The bipolar plate (1) is provided with a water inlet channel, a water oxygen outlet channel, and a hydrogen outlet channel. The anode plate (A) and the cathode plate (B) are welded to form multiple welding lines (18) or glued to form multiple glued lines. All of the welding lines (18) or glued lines are closed lines. The water inlet channel, the water oxygen outlet channel, and the hydrogen outlet channel are separated by the welding lines (18) or glued lines.

4. The proton exchange membrane water electrolyzer according to claim 3, characterized in that, The front side of the anode plate (A) is partially recessed to form an anode reaction zone (5), and the front side of the cathode plate (B) is partially recessed to form a cathode reaction zone (6). The water inlet channel includes a water inlet (2), a water inlet guide hole (15), and a water inlet guide groove (7) connected in sequence. The water inlet (2) penetrates the two opposite surfaces of the bipolar plate (1). The water inlet (2) is located outside the water inlet guide groove (7). The water inlet guide groove (7) is located in the anode reaction zone (5). The oxygen outlet channel includes an oxygen outlet (3), an oxygen outlet guide hole (16), and an oxygen outlet guide groove (8) connected in sequence. The oxygen outlet (3) penetrates the two opposite surfaces of the bipolar plate (1). The oxygen outlet (3) is located outside the oxygen outlet guide groove (8). The oxygen outlet guide groove (8) is located in the anode reaction zone (5). There are two hydrogen outlet channels. Each hydrogen outlet channel includes a hydrogen outlet (4), a hydrogen outlet guide hole (17), and a hydrogen outlet guide groove (9) connected in sequence. The hydrogen outlet (4) penetrates the two opposite surfaces of the bipolar plate (1). The hydrogen outlet (4) is located outside the hydrogen outlet guide groove (9). The hydrogen outlet guide groove (9) is located in the cathode reaction zone (6).

5. The proton exchange membrane water electrolyzer according to claim 4, characterized in that, The two hydrogen outlet channels are located at two opposite corners of the bipolar plate (1), and the water inlet channel and the oxygen outlet channel are located at the other two opposite corners of the bipolar plate (1).

6. The proton exchange membrane water electrolyzer according to claim 5, characterized in that, The water inlet (2) and the oxygen outlet (3) are centrally symmetrical, and the two hydrogen outlets (4) are centrally symmetrical.

7. The proton exchange membrane water electrolyzer according to claim 6, characterized in that, The cross-sectional shape and size of the water inlet (2), the oxygen outlet (3), and the hydrogen outlet (4) are the same.

8. The proton exchange membrane water electrolyzer according to claim 1, characterized in that, It also includes a diffusion layer (21) and a proton exchange membrane (22), both of which are disposed between the anode plate (A) and the cathode plate (B).

9. The proton exchange membrane water electrolyzer according to claim 1, characterized in that, The bipolar plate (1) is provided with a first positioning hole (12) and a second positioning hole (13) spaced apart. In the thickness direction of the bipolar plate (1), the first positioning hole (12) and the second positioning hole (13) respectively penetrate the two opposite surfaces of the bipolar plate (1).

10. A proton exchange membrane water electrolysis system, characterized in that, The proton exchange membrane water electrolyzer includes any one of claims 1-9.

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