A sealing structure of a PEM electrolytic water hydrogen production electrode plate

Abstract

The utility model relates to a kind of sealing structure of PEM electrolytic water hydrogen production polar plate, including metal plate, one side of metal plate is provided with anode outer seal, anode side hydrogen port seal and anode side water port cover plate, the other side is provided with cathode outer seal, cathode side water port seal and cathode side hydrogen port cover plate;Anode outer seal surrounds anode side hydrogen port seal and anode side water port cover plate;Cathode outer seal surrounds cathode side water port seal and cathode side hydrogen port cover plate setting;Anode side hydrogen port seal is directly opposite cathode side hydrogen port cover plate, and cathode side water port seal is directly opposite anode side water port cover plate.The utility model is used to reduce the sensitivity of sealing design to processing error, assembly process error and vibration, thermal deformation, solve the breakthrough problem of cover plate port seal, realize the independent adjustment of cover plate port sealing structure, increase the success rate of sealing scheme, improve sealing effect by extending leakage path.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen production by water electrolysis, and particularly relates to a sealing structure of a PEM water electrolysis hydrogen production electrode plate. Background Technology

[0002] Currently, in the field of PEM electrolyzers, the sealing structure of electrolyzers generally adopts a fully aligned form, achieving sealing through the contact between the sealing surfaces. The sealing capability depends on the width of the contact surfaces and the surface contact stress. A common problem with this sealing structure is its extreme sensitivity to misalignment of the sealing components. Strict manufacturing and assembly precision is required. However, with etching currently being the mainstream processing technology for metal electrodes, there are significant limitations in processing precision, making the sealing components highly susceptible to misalignment and leading to seal failure. Furthermore, under high-temperature environments, uneven thermal expansion of the sealing components on both sides can cause an imbalance in contact stress distribution, increasing the risk of leakage. Summary of the Invention

[0003] This invention provides a sealing structure for a PEM electrolysis water hydrogen production electrode plate, which reduces the sensitivity of the sealing design to processing errors, assembly process errors, vibration, and thermal deformation, solves the problem of the cover plate opening seal, enables independent adjustment of the cover plate opening sealing structure, increases the success rate of the sealing solution, and improves the sealing effect by extending the leakage path.

[0004] The technical solution of this utility model is as follows: A sealing structure of a PEM electrolysis water hydrogen production electrode plate includes a metal plate and a membrane electrode. One side of the metal plate is provided with an anode outer sealing element, an anode side hydrogen port sealing element and an anode side water port cover plate, and the other side is provided with a cathode outer sealing element, a cathode side water port sealing element and a cathode side hydrogen port cover plate. The outer sealing element of the anode surrounds the hydrogen port sealing element of the anode side and the water port cover plate of the anode side, and the hydrogen port sealing element of the anode side is arranged along the width direction of the metal plate; The cathode outer seal is arranged around the cathode side water inlet seal and the cathode side hydrogen inlet cover, and the cathode side water inlet seal is arranged along the length direction of the metal plate; The anode-side hydrogen port seal is directly opposite the cathode-side hydrogen port cover plate, and the cathode-side water port seal is directly opposite the anode-side water port cover plate; The membrane electrode is disposed between two metal plates.

[0005] Furthermore, the length and width of the cathode-side hydrogen port cover are both greater than the length and width of the anode-side hydrogen port seal.

[0006] Furthermore, the length and width of the anode-side water inlet cover are both greater than the length and width of the cathode-side water inlet seal.

[0007] Furthermore, one side of the metal plate is provided with an anode-side settling tank, the anode-side water inlet cover is placed in the anode-side settling tank, and a gap is left between the anode-side settling tank and the anode-side water inlet cover; A cathode-side sinking tank is provided on the other side of the metal plate, and the cathode-side hydrogen port cover is placed in the cathode-side sinking tank, with a gap between the cathode-side sinking tank and the cathode-side hydrogen port cover.

[0008] Furthermore, the thickness of the anode-side inlet cover is 0~0.2mm greater than the depth of the anode-side settling tank; The thickness of the cathode-side hydrogen port cover plate is 0~0.2mm greater than the depth of the cathode-side settling tank.

[0009] Furthermore, the gap between the anode-side settling tank and the anode-side inlet cover is in the range of 0.3~1.5mm; The gap between the cathode-side settling tank and the cathode-side hydrogen port cover plate is in the range of 0.3~1.5mm.

[0010] Furthermore, the metal plate is provided with a through hydrogen flow channel, and the anode-side hydrogen port seal is provided to surround the hydrogen flow channel.

[0011] Furthermore, the metal plate is provided with a through water-side flow channel, and the cathode-side water inlet seal is provided to surround the water-side flow channel.

[0012] Furthermore, the hydrogen port seal on the anode side is 0~0.3mm thicker than the outer seal on the anode side, and the water port seal on the cathode side is 0~0.3mm thicker than the outer seal on the cathode side.

[0013] Furthermore, the anode-side water inlet cover and the cathode-side hydrogen inlet cover are 0.2~1mm thick.

[0014] The beneficial effects of this utility model are as follows: This novel sealing design has a high tolerance for machining errors in the etched electrode plate and errors in the assembly process, thus improving assembly efficiency. This novel sealing design can double the actual sealing band width, extending the leakage path and improving the sealing effect. This novel sealing design can compensate for a certain axial deviation and can adapt to working conditions with large vibrations or thermal deformations. This novel sealing design allows for independent adjustment of the cover plate opening sealing structure, achieving differentiated design. This novel sealing design avoids the problem of the cover plate opening seal penetrating through. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the metal plate of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the overall sealing of the hydrogen chamber.

[0019] Figure 5 This is a schematic diagram of the overall sealing of the water cavity. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] In the technical solution of this utility model, Figure 1 and Figure 3 This is a structural schematic diagram of a sealing structure for a PEM electrolysis water hydrogen production electrode plate according to the present invention, as shown in the diagram. Figure 1 As shown, this utility model includes: It includes a metal plate 1 and a membrane electrode 9. One side of the metal plate 1 is provided with an anode outer seal 3, an anode side hydrogen port seal 4 and an anode side water port cover 7, and the other side is provided with a cathode outer seal 2, a cathode side water port seal 5 and a cathode side hydrogen port cover 6. The outer sealing element 3 of the anode surrounds the hydrogen port sealing element 4 of the anode and the water port cover plate 7 of the anode, and the hydrogen port sealing element 4 of the anode is arranged along the width direction of the metal plate 1; The cathode outer seal 2 is arranged around the cathode side water inlet seal 5 and the cathode side hydrogen inlet cover 6, and the cathode side water inlet seal 5 is arranged along the length direction of the metal plate 1. The anode-side hydrogen port seal 4 is directly opposite the cathode-side hydrogen port cover 6, and the cathode-side water port seal 5 is directly opposite the anode-side water port cover 7. like Figure 1 and Figure 2 As shown, the membrane electrode 9 is disposed between two metal plates 1. Specifically, one side of the membrane electrode 9 contacts the anode surface of one metal plate, and the other side contacts the cathode surface of the metal plate.

[0022] The anode-side hydrogen port seal 4 and the cathode-side hydrogen port cover plate 6 form a sealing structure at the cover plate position. The anode-side hydrogen port seal achieves internal leakage sealing through the membrane electrode frame 9 and the cathode-side hydrogen port cover plate structure, while the cathode-side outer seal 2 achieves external leakage sealing, ultimately realizing... Figure 4The hydrogen cavity shown is completely sealed. The cathode-side nozzle seal 5 and the anode-side nozzle cover 7 form a sealing structure at the cover plate position. The cathode-side nozzle seal achieves internal leakage sealing through the membrane electrode frame 9 and the anode-side nozzle cover structure, while the anode-side outer seal 3 achieves external leakage sealing, ultimately realizing... Figure 5 The water cavity shown is completely sealed.

[0023] In one embodiment of this utility model, the length and width of the cathode-side hydrogen port cover plate 6 are both greater than the length and width of the anode-side hydrogen port seal 4. The length and width of the anode-side water port cover plate 7 are both greater than the length and width of the cathode-side water port seal 5. Specifically, the anode-side hydrogen port seal and the cathode-side water port seal are positioned inside the cathode-side hydrogen port cover plate to prevent the seals from being misaligned. Specifically, the distance between the anode-side hydrogen port seal and the outer edge of the cover plate is controlled between 0.5 and 5 mm. Similarly, the distance between the cathode-side water port seal and the outer edge of the cover plate is controlled between 0.5 and 5 mm.

[0024] One side of the metal plate 1 is provided with an anode side settling tank, and the anode side water outlet cover plate 7 is placed in the anode side settling tank, with a gap between the anode side settling tank and the anode side water outlet cover plate 7.

[0025] A cathode-side sinking tank is provided on the other side of the metal plate 1, and the cathode-side hydrogen port cover plate 6 is placed in the cathode-side sinking tank, with a gap between the cathode-side sinking tank and the cathode-side hydrogen port cover plate 6.

[0026] The thickness of the anode-side water inlet cover 7 is 0-0.2 mm greater than the depth of the anode-side settling tank; the thickness of the cathode-side hydrogen outlet cover 6 is 0-0.2 mm greater than the depth of the cathode-side settling tank. It should be noted that during processing, the cover plate may deviate downwards, and the settling tank may deviate upwards.

[0027] The gap between the anode-side settling tank and the anode-side water inlet cover 7 is 0.3~1.5mm; the gap between the cathode-side settling tank and the cathode-side hydrogen inlet cover 6 is 0.3~1.5mm.

[0028] A through-flow hydrogen flow channel is provided on the metal plate 1, and the anode-side hydrogen port seal 4 surrounds the hydrogen flow channel. A through-flow water flow channel is provided on the metal plate 1, and the cathode-side water port seal 5 surrounds the water flow channel. There are two hydrogen flow channels and two water flow channels, with a channel spacing of 0.5~2mm between the channels below the cover plate, and the platform width is 0.5~2mm.

[0029] The thickness of the anode-side water inlet cover 7 and the cathode-side hydrogen inlet cover 6 is 0.2~1mm. The thickness of the two covers is designed to be controlled within 0.2~1mm, and they need to be able to withstand 100~200MPa without deformation. The materials can be selected from corrosion-resistant materials such as titanium and stainless steel.

[0030] The hydrogen port seal 4 on the anode side is 0-0.3 mm thicker than the outer anode seal 3, and the water port seal 5 on the cathode side is 0-0.3 mm thicker than the outer cathode seal 2. Specifically, the hydrogen port and water port seals are 0-0.3 mm thicker than the outer cathode and anode seals.

[0031] It should be noted that the distribution distance between the outer cathode seal and the outer anode seal is controlled at 2~4mm, and this utility model does not limit the specific positional relationship between the outer anode seal and the outer cathode seal, that is, it should include the scenario where the outer anode seal is designed outside the outer cathode seal.

[0032] In this invention, the sealing element is fabricated within the sealing groove using integrated processes such as injection molding, bonding, and transfer injection. A cover plate recess is designed on the etched metal plate, and a certain gap needs to be reserved around the cover plate and the cover plate recess to avoid interference issues at the R-angle of the etching process. The anode-side hydrogen port seal needs to be positioned inside the cathode-side hydrogen port cover plate, and the cathode-side water port seal needs to be positioned inside the anode-side water port cover plate to prevent the seal from being misaligned. The thickness of the anode-side hydrogen port seal and the cathode-side water port seal can be independently adjusted according to the fit tolerance between the cover plate and the cover plate recess. The cover plate needs to have sufficient support strength, and the flow channel below the cover plate needs to be designed with a gap to prevent the seal stress from deforming the cover plate. The cathode outer seal is designed outside the anode outer seal, and the stress transmitted through the anode outer seal can extend the actual sealing band, improving the sealing capability of the hydrogen cavity.

[0033] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sealing structure for a PEM electrolysis water-to-hydrogen electrode plate, characterized in that, It includes a metal plate (1) and a membrane electrode (9). One side of the metal plate (1) is provided with an anode outer seal (3), an anode side hydrogen port seal (4) and an anode side water port cover (7), and the other side is provided with a cathode outer seal (2), a cathode side water port seal (5) and a cathode side hydrogen port cover (6). The outer sealing element (3) of the anode surrounds the hydrogen port sealing element (4) of the anode side and the water port cover plate (7) of the anode side, and the hydrogen port sealing element (4) of the anode side is arranged along the width direction of the metal plate (1); The cathode outer seal (2) is arranged around the cathode side water inlet seal (5) and the cathode side hydrogen inlet cover (6), and the cathode side water inlet seal (5) is arranged along the length direction of the metal plate (1); The anode-side hydrogen port seal (4) is directly opposite the cathode-side hydrogen port cover plate (6), and the cathode-side water port seal (5) is directly opposite the anode-side water port cover plate (7). The membrane electrode (9) is disposed between two metal plates (1).

2. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 1, characterized in that, The length and width of the cathode-side hydrogen port cover plate (6) are both greater than the length and width of the anode-side hydrogen port seal (4).

3. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 1, characterized in that, The length and width of the anode-side water inlet cover (7) are both greater than the length and width of the cathode-side water inlet seal (5).

4. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 1, characterized in that, The metal plate (1) has an anode side sinking trough on one side, and the anode side water outlet cover plate (7) is placed in the anode side sinking trough. A gap is left between the anode side sinking trough and the anode side water outlet cover plate (7). A cathode-side sinking tank is provided on the other side of the metal plate (1), and the cathode-side hydrogen port cover plate (6) is placed in the cathode-side sinking tank, with a gap between the cathode-side sinking tank and the cathode-side hydrogen port cover plate (6).

5. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 4, characterized in that, The thickness of the anode-side inlet cover (7) is 0~0.2mm greater than the depth of the anode-side settling tank; The thickness of the cathode-side hydrogen port cover plate (6) is 0~0.2mm greater than the depth of the cathode-side sink.

6. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 4, characterized in that, The gap between the anode side settling tank and the anode side water inlet cover (7) is 0.3~1.5mm. The gap between the cathode-side sink and the cathode-side hydrogen port cover (6) is 0.3~1.5mm.

7. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 1, characterized in that, The metal plate (1) is provided with a through hydrogen flow channel, and the anode-side hydrogen port seal (4) is provided to surround the hydrogen flow channel.

8. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 1, characterized in that, The metal plate (1) is provided with a through water-side flow channel, and the cathode-side water inlet seal (5) is provided to surround the water-side flow channel.

9. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 1, characterized in that, The anode-side hydrogen port seal (4) is 0~0.3mm thicker than the anode-side outer seal (3), and the cathode-side water port seal (5) is 0~0.3mm thicker than the cathode-side outer seal (2).

10. The sealing structure of the PEM electrolysis water production electrode plate as described in claim 1, characterized in that, The anode-side water inlet cover (7) and the cathode-side hydrogen inlet cover (6) are 0.2~1mm thick.

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