Sealing structure for proton exchange membrane water electrolyser and electrolyser

Abstract

The utility model discloses a sealing structure for proton exchange membrane water electrolyser and electrolyser, the sealing structure is arranged between membrane electrode and first pole plate and second pole plate on both sides of membrane electrode, the sealing structure comprises a sealing body and a limit structure, the limit structure comprises a first limit structure and a second limit structure; the sealing body comprises a first sealing groove and a first sealing ring which are arranged between the first polar plate and the membrane electrode, and a second sealing groove and a second sealing ring which are arranged between the second polar plate and the membrane electrode; the first limiting structure comprises a first limiting groove and first limiting parts, at least one first limiting part is arranged around the first sealing ring, and an adaptive first limiting groove is formed around the first sealing groove; the second limiting structure comprises a second limiting groove and a second limiting part, at least one second limiting part is arranged around the second sealing ring, and an adaptive second limiting groove is formed around the second sealing groove. The technical problem that stable operation is affected due to poor sealing performance of a sealing structure of an existing electrolytic cell is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic water hydrogen production technical field, concretely relates to a sealing structure and electrolytic tank for proton exchange membrane water electrolytic tank. BACKGROUND

[0002] The proton exchange membrane water electrolysis technology has high current density, low energy consumption, high hydrogen production pressure, small volume of proton exchange membrane water electrolytic tank, flexible operation and is beneficial to rapid load change, and is a suitable scheme for electrolytic water hydrogen production.

[0003] The sealing structure of the proton exchange membrane water electrolytic tank generally comprises a sealing ring arranged between the membrane electrode and the bipolar plate and a sealing groove matched with the sealing ring. Under the action of the pressing force, the sealing ring placed in the sealing groove of the bipolar plate of the proton exchange membrane water electrolytic tank is elastically and plastically deformed, fills the gap between the sealing surfaces of the bipolar plate, and achieves the purpose of sealing. However, when the area of the bipolar plate in the proton exchange membrane water electrolytic tank is large and high-pressure hydrogen and high-pressure oxygen are generated in the electrolytic tank, the sealing ring in the sealing groove of the bipolar plate has a tendency to move outward, which is prone to problems such as exposure of the sealing ring or gas leakage, thereby affecting the safe and stable operation of the electrolytic tank. SUMMARY

[0004] The utility model provides a sealing structure and electrolytic tank for proton exchange membrane water electrolytic tank, solved the sealing structure of existing proton exchange membrane water electrolytic tank in the environment of high pressure hydrogen and high pressure oxygen, the sealing ring in the sealing groove of bipolar plate has the tendency to move to the outside, and is prone to problems such as exposure of the sealing ring or gas leakage, thereby affecting the safe and stable operation of the electrolytic tank.

[0005] Therefore, the utility model provides a sealing structure for proton exchange membrane water electrolytic tank, which is arranged between the membrane electrode and the first and second bipolar plates on both sides of the membrane electrode of the PEM electrolytic tank. The sealing structure comprises a sealing body and a limiting structure, and the limiting structure comprises a first limiting structure and a second limiting structure arranged around the sealing body. The sealing body comprises a first sealing groove and a first sealing ring arranged between the first bipolar plate and the membrane electrode, and a second sealing groove and a second sealing ring arranged between the second bipolar plate and the membrane electrode. The first sealing groove is arranged on the first bipolar plate, and the first sealing ring is embedded in the first sealing groove. The second sealing groove is arranged on the second bipolar plate, and the second sealing ring is embedded in the second sealing groove.

[0006] The first limiting structure comprises a first limiting groove and a first limiting part, at least one first limiting part is arranged around the first sealing ring, and a corresponding first limiting groove is arranged around the first sealing groove.

[0007] Optionally, the second sealing groove has the same structure as the first sealing groove, the first sealing groove comprises a first groove body and two second groove bodies, the first groove body is arranged around the reaction area of the first polar plate, and the two second groove bodies are arranged on the two sides of the first groove body respectively.

[0008] Optionally, the middle part of the side of the second groove body away from the first groove body is provided with the first limiting groove.

[0009] Optionally, the first sealing ring comprises a first base and a first protruding part, the first base is embedded in the first sealing groove, and the first protruding part is arranged on the side of the first base facing the membrane electrode and extends out of the first sealing groove.

[0010] Optionally, the first protruding part comprises a plurality of first convex edges arranged at intervals along the width direction of the first base.

[0011] Optionally, the width of the first convex edge gradually decreases in the direction towards the membrane electrode.

[0012] And / or, the first base and the first protruding part are integrally formed.

[0013] And / or, the corners of the first convex edge are provided with first rounded corners.

[0014] Optionally, the first protruding part further comprises two second convex edges, the two second convex edges are arranged at the two ends of the first base in the width direction respectively, and the first convex edge is located between the two second convex edges.

[0015] Optionally, the width of the first convex edge is greater than the width of the second convex edge, and the thickness of the first convex edge is greater than the thickness of the second convex edge.

[0016] And / or, the second convex ridge is provided with a second chamfer at the corner of the side of the first convex ridge.

[0017] And / or, the second convex ridge is provided with a second chamfer at the corner of the side of the first convex ridge.

[0018] Optionally, the first sealing ring and the second sealing ring are symmetrically arranged.

[0019] The utility model discloses a second aspect provides a kind of electrolytic cell, including first polar plate, second polar plate and membrane electrode, the membrane electrode is clamped between the first polar plate and the second polar plate, and sealing structure is equipped between the membrane electrode and the first polar plate and the second polar plate on its both sides, the sealing structure uses the sealing structure for the proton exchange membrane water electrolytic cell as any one of first aspect.

[0020] The utility model technical scheme has the following advantages:

[0021] In the utility model, the first sealing ring is pressed between the first polar plate and the membrane electrode, and the second sealing ring is pressed between the second polar plate and the membrane electrode, so that each inlet and outlet cavity and reaction area between the second polar plate and the membrane electrode and between the first polar plate and the membrane electrode are sealed; the first limiting part and the second limiting part are limited by the interaction force generated by cooperation with the first limiting groove and the second limiting groove respectively, and the first sealing ring and the second sealing ring increase the static friction force by contacting the membrane electrode, so that the whole is not easy to move out of position under high pressure, and the first sealing ring and the second sealing ring are prevented from moving under high pressure, to prevent the problems such as leakage of the first sealing ring and the second sealing ring or gas leakage, and ensure the safe and stable operation of the electrolytic cell. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0023] Figure 1 The sealing structure for the proton exchange membrane water electrolytic cell provided by the utility model is shown in the structural schematic view.

[0024] Figure 2 The structural schematic view of the first sealing ring provided by the utility model is shown.

[0025] Figure 3 The cross-sectional view of the first sealing ring and the second sealing ring in the first embodiment of the utility model before pressing is shown.

[0026] Figure 4 The first sealing ring and the second sealing ring in the first embodiment of the utility model provide cross-sectional view after pressing together;

[0027] Figure 5 The first sealing ring and the second sealing ring in the second embodiment of the utility model provide cross-sectional view before pressing together;

[0028] Figure 6 The first sealing ring and the second sealing ring in the second embodiment of the utility model provide cross-sectional view after pressing together.

[0029] Mark explanation:

[0030] 1, second polar plate;2, first polar plate;3, membrane electrode;4, first sealing groove;41, first groove body;42, second groove body;5, first sealing ring;51, first limiting part;52, first base;53, first protruding part;5301, first ridge;5302, second ridge;6, first limiting groove;7, second sealing ring;8, first bottom glue;9, first through port. Specific implementation

[0031] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0032] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication inside two elements.For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0034] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.

[0035] Example 1

[0036] Please refer to Figures 1 to 6 The sealing structure is arranged between the membrane electrode 3 and the first polar plate 2 and the second polar plate 1 on both sides of the PEM electrolytic tank, and the sealing structure comprises a sealing body and a limiting structure, the limiting structure comprises a first limiting structure and a second limiting structure arranged around the sealing body; the sealing body comprises a first sealing groove 4 and a first sealing ring 5 arranged between the first polar plate 2 and the membrane electrode 3, a second sealing groove and a second sealing ring 7 arranged between the second polar plate 1 and the membrane electrode 3; the first sealing groove 4 is arranged on the first polar plate 2, and the first sealing ring 5 is embedded in the first sealing groove 4; the second sealing groove is arranged on the second polar plate 1, and the second sealing ring 7 is embedded in the second sealing groove; the first limiting structure comprises a first limiting groove 6 and a first limiting part 51, at least one first limiting part 51 is arranged around the first sealing ring 5, and a matched first limiting groove 6 is arranged around the first sealing groove 4; the second limiting structure comprises a second limiting groove and a second limiting part, at least one second limiting part is arranged around the second sealing ring 7, and a matched second limiting groove is arranged around the second sealing groove.

[0037] It should be noted that a plurality of inlet and outlet cavities and reaction regions are correspondingly arranged on the second polar plate 1 and the first polar plate 2, and the first sealing groove 4 and the second sealing groove are correspondingly arranged around the outer periphery of each inlet and outlet cavity and reaction region to form a sealed area.

[0038] In this embodiment, by arranging the first sealing groove 4 and the second sealing groove on the first polar plate 2 and the second polar plate 1 respectively, and embedding the first sealing ring 5 and the second sealing ring 7 in the first sealing groove 4 and the second sealing groove respectively, when assembling, the first sealing ring 5 is pressed between the first polar plate 2 and the membrane electrode 3, and the second sealing ring 7 is pressed between the second polar plate 1 and the membrane electrode 3, to form a sealing structure, and the first limiting groove 6 and the second limiting groove are arranged on the first sealing groove 4 and the second sealing groove respectively, and are limited by the first limiting part 51 and the second limiting part respectively, to improve the stability of the embedding of the first sealing ring 5 in the first sealing groove 4 and the embedding of the second sealing ring 7 in the second sealing groove, and the static friction force is generated by pressing the first sealing ring 5 and the second sealing ring 7, and the interaction force is generated between the first limiting part 51 and the first limiting groove 6 and between the second limiting part and the second limiting groove, so that the whole is not easy to move out of position under high pressure, and the movement of the first sealing ring 5 and the second sealing ring 7 under high pressure is avoided, and problems such as leakage of the first sealing ring 5 and the second sealing ring 7 or gas leakage are prevented, to ensure the safe and stable operation of the electrolytic cell.

[0039] Embodiment 2

[0040] As a further improvement of Embodiment 1, as shown in Figure 1 the second sealing groove is the same structure as the first sealing groove 4, and the first sealing groove 4 includes a first groove body 41 and two second groove bodies 42, the first groove body 41 is arranged around the periphery of the reaction area of the first polar plate 2; the two second groove bodies 42 are arranged on the two sides of the first groove body 41 respectively, the shape of the second groove body 42 is matched with the arrangement shape of the first through port 9 on the first polar plate 2; the second groove body 42 is in communication with the first groove body 41 and encloses the periphery of each first through port 9; the first limiting groove 6 is arranged at the inlet and outlet passage of the reaction area of the first polar plate 2; or, the first limiting groove 6 is arranged on the side of the second groove body 42 away from the first groove body 41; or, the first limiting groove 6 is arranged at the inlet and outlet passage of the reaction area of the first polar plate 2 and on the side of the second groove body 42 away from the first groove body 41.

[0041] It should be noted that the first groove body 41 and the two second groove bodies 42 form the first sealing groove 4; the first groove body 41 is arranged in a rectangular shape; the two ends of the first polar plate 2 have a plurality of first through ports 9 for the inlet and outlet of gas and liquid; the second polar plate 1 has a plurality of second through ports for the inlet and outlet of gas and liquid; the first sealing groove 4 is arranged around the outer periphery of each first through port 9 on each first polar plate 2 and its reaction area to form a sealing area; the second sealing groove is arranged around the outer periphery of each second through port on each second polar plate 1 and its reaction area to form a sealing area; the first through port 9 and the second through port form an inlet and outlet cavity.

[0042] In the embodiment, each inlet and outlet cavity is formed through the first through hole 9 on the first polar plate 2, and the reaction area and each first through hole 9 on the first polar plate 2 are individually sealed by the first groove body 41 and the second groove body 42 to improve the sealing effect; the first limiting groove 6 can be arranged at the inlet and outlet passage of the reaction area of the first polar plate 2 (when the first polar plate 2 is on the anode side, the inlet and outlet passage is the water inlet and the water outlet oxygen port), and the first limiting part 51 is arranged at the corresponding position on the first sealing ring 5 to limit the first limiting groove 6, so as to ensure the stability under high pressure and avoid dislocation under high pressure.

[0043] In a preferred embodiment based on the above-described embodiments, as shown in Figure 1 The middle part of the side of the second groove body 42 away from the first groove body 41 is provided with the first limiting groove 6.

[0044] In the embodiment, the first limiting groove 6 is arranged in the middle part of the second groove body 42, and the first limiting part 51 is arranged to ensure uniform stress and improve stability.

[0045] Specifically, the first polar plate 2 and the second polar plate 1 each have an anode surface and a cathode surface, the side of the first polar plate 2 facing the membrane electrode 3 is the anode surface, and the side of the second polar plate 1 facing the membrane electrode 3 is the cathode surface, so as to facilitate clamping the membrane electrode 3 to form an electrolytic cell and clamping the first sealing ring 5 and the second sealing ring 7 to seal, thereby ensuring stable operation of the electrolytic cell.

[0046] Specifically, as shown in Figure 1As shown, the second sealing groove comprises a third groove and two fourth grooves, the third groove is arranged around the periphery of the reaction area of the second polar plate 1; the two fourth grooves are arranged on the two sides of the third groove respectively, the shape of the fourth groove is matched with the arrangement shape of the second through hole on the second polar plate 1; the fourth groove is in communication with the third groove and encloses the periphery of each second through hole; the third groove is provided with a second limiting groove at the inlet and outlet channel of the reaction area of the first polar plate 2; or the side of the fourth groove away from the third groove is provided with a second limiting groove; or both the third groove at the inlet and outlet channel of the reaction area of the second polar plate 1 and the side of the fourth groove away from the third groove are provided with a second limiting groove. It should be noted that the third groove and the two fourth grooves are in communication to form the second sealing groove; the third groove is arranged in a rectangular shape. In this embodiment, the second reaction area and each second through hole are individually sealed by forming each inlet and outlet cavity through the second through hole on the second polar plate 1 and enclosing the third groove and the fourth groove, thereby improving the sealing effect; the second limiting groove can be arranged at the inlet and outlet channel of the reaction area of the second polar plate 1 (when the second polar plate 1 is on the cathode side, the inlet and outlet channel is the hydrogen outlet), and the second limiting portion is arranged at the corresponding position on the second sealing ring 7 to cooperate with the second limiting groove for limiting, thereby ensuring the stability under high pressure and avoiding dislocation under high pressure; the second limiting groove can also be arranged on the side of the fourth groove away from the third groove, and the second limiting portion is arranged at the corresponding position on the second sealing ring 7 to cooperate with the second limiting groove at the corresponding position for limiting, thereby avoiding dislocation under high pressure; the second limiting groove can also be arranged at the inlet and outlet channel of the reaction area of the second polar plate 1 and on the side of the fourth groove away from the third groove, and the second limiting portion is arranged at the corresponding position on the second sealing ring 7 to cooperate with the second limiting groove at the corresponding position for limiting, thereby further improving the limiting effect and ensuring the stability of the whole; the number and position of the second limiting groove are not specifically limited in this embodiment, and can be selected according to actual conditions, preferably, the second limiting groove is arranged at the inlet and outlet channel of the reaction area of the second polar plate 1 and on the side of the fourth groove away from the third groove, and the second limiting portion is arranged at the corresponding position on the second sealing ring 7, thereby ensuring the stability of the second sealing ring 7 pressed between the second polar plate 1 and the membrane electrode 3.

[0047] Specifically, as shown in the drawings, Figure 1 the middle part of the side of the fourth groove away from the third groove is provided with a second limiting groove. By arranging the second limiting groove in the middle part of the fourth groove and cooperating with the second limiting portion, the stress is uniform and the stability is improved.

[0048] Specifically, the position of the first through hole 9 corresponds to the position of the second through hole, so as to form each inlet and outlet cavity when superimposed.

[0049] On the basis of the above-mentioned embodiments, in a preferred embodiment,Figures 3 to 4 As shown in the figure, the first sealing ring 5 includes a first base 52 and a first protruding part 53, the first base 52 is embedded in the first limiting groove 6; the first protruding part 53 is arranged on the side of the first base 52 facing the membrane electrode 3 and extends out of the first sealing groove 4, and the second sealing ring 7 has the same structure as the first sealing ring 5.

[0050] In this embodiment, the first sealing ring 5 includes a first base 52 and a first protruding part 53, which is arranged in the first limiting groove 6 through the first base 52, and the first protruding part 53 extends out of the first sealing groove 4 in the natural state (as shown in the figure Figure 3 and Figure 5 As shown in the figure), so as to have sufficient compression allowance, when the first sealing ring 5 is pressed between the first polar plate 2 and the membrane electrode 3, the first base 52 and the first protruding part 53 are both compressed and deformed, so that the first base 52 and the first protruding part 53 are deformed and fill the entire first sealing groove 4 (as shown in the figure Figure 4 and Figure 6 As shown in the figure), and increase the static friction between the first sealing ring 5 and the membrane electrode 3, improve the stability, prevent misalignment, and improve the sealing performance to prevent gas leakage.

[0051] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in the figure Figure 3 and Figure 5 The first protruding part 53 includes a plurality of first ribs 5301 arranged along the width direction of the first base 52.

[0052] In this embodiment, the first protruding part 53 is composed of a plurality of first ribs 5301 arranged at intervals, which can fill the entire first sealing groove 4 after compression of the plurality of first ribs 5301, as shown in the figure Figure 4 As shown in the figure, it can save materials, and reduce the pressure required when pressing the first sealing ring 5 between the first polar plate 2 and the membrane electrode 3, facilitate assembly, and the plurality of first ribs 5301 cooperate with the membrane electrode 3 to increase the static friction between the first sealing ring 5 and the membrane electrode 3, which is more suitable for use in high-pressure hydrogen and high-pressure oxygen environments, and improves the stability.

[0053] In an embodiment, the first rib 5301 has a cross-sectional length of 1mm-2mm and a cross-sectional width of 0.2mm-0.4mm in the natural state, and the distance between adjacent two first ribs 5301 is 0.5mm-1.5mm, so as to fill the entire first sealing groove 4 after compression of the plurality of first ribs 5301, avoid gaps, and save materials to the maximum extent.

[0054] Specifically, in the natural state, the thickness of the first sealing ring 5 is greater than the depth of the first sealing groove 4, so that when the first polar plate 2 and the membrane electrode 3 clamp the first sealing ring 5, the first sealing ring 5 has sufficient compression allowance to fill the entire first sealing groove 4, while improving the sealing effect after assembly.

[0055] Specifically, in the natural state, the thickness of the second sealing ring 7 is greater than the depth of the second sealing groove, so that when the second polar plate 1 and the membrane electrode 3 clamp the first sealing ring 5, the second sealing ring 7 has sufficient compression allowance to fill the entire second sealing groove, while improving the sealing effect after assembly.

[0056] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 3 and Figure 5 The width of the first protruding rib 5301 gradually decreases in the direction towards the membrane electrode 3.

[0057] In this embodiment, the width of the first protruding rib 5301 gradually decreases in the direction towards the membrane electrode 3, so that when the first polar plate 2 and the membrane electrode 3 are pressed tightly under a certain pressure, the first protruding rib 503 can fill the first sealing groove 4 after compression, and has a large friction with the membrane electrode 3, which has excellent sealing performance while avoiding the displacement of the membrane electrode 3.

[0058] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 3 and Figure 5 The first base 52 and the first protruding part 53 are integrally formed.

[0059] In this embodiment, the first base 52 and the first protruding part 53 are integrally formed, which ensures the sealing effect.

[0060] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 5 The first protruding part 53 further comprises two second protruding ribs 5302, which are respectively arranged at the two ends of the first base 52 in the width direction, and the first protruding rib 5301 is located between the two second protruding ribs 5302.

[0061] In this embodiment, by adding two second protruding ribs 5302 to assist in filling the two end regions of the first sealing groove 4 in the width direction, as shown in Figure 6 The sealing performance is further improved, which more effectively prevents the problems of exposure of the first sealing ring 5 or gas leakage.

[0062] On the basis of the above-mentioned embodiments, in a preferred embodiment, the width of the first protruding rib 5301 is greater than the width of the second protruding rib 5302, and the thickness of the first protruding rib 5301 is greater than the thickness of the second protruding rib 5302.

[0063] In the embodiment, the width of the first ridge 5301 and the width of the second ridge 5302 adopt a proper ratio, and the thickness of the first ridge 5301 and the thickness of the second ridge 5302 adopt a proper ratio, so that when the first seal ring 5 is pressed by the first polar plate 2 and the membrane electrode 3, the first ridge 5301 and the second ridge 5302 fill the first seal groove 4 in cooperation with each other, improving the sealing performance. Preferably, the ratio of the width of the first ridge 5301 to the width of the second ridge 5302 is 2-3, and the ratio of the thickness of the first ridge 5301 to the thickness of the second ridge 5302 is 1-2.

[0064] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 3 and Figure 5 The corners of the first ridge 5301 are each provided with a first chamfer.

[0065] In the embodiment, the corners of the first ridge 5301 are each provided with a first chamfer for transition treatment, which facilitates deformation to fill the first seal groove 4 when pressed, improving the sealing performance.

[0066] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 5 The corners of the second ridge 5302 towards the first ridge 5301 are each provided with a second chamfer.

[0067] In the embodiment, the corners of the second ridge 5302 towards the first ridge 5301 are each provided with a second chamfer for transition treatment, which facilitates deformation and cooperation with the first ridge 5301 to fill the first seal groove 4 when pressed, improving the sealing performance.

[0068] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 5 The side of the second ridge 5302 close to the first ridge 5301 is inclined towards the first ridge 5301.

[0069] In the embodiment, the structure is inclined to facilitate assembly when the first polar plate 2 and the membrane electrode 3 are pressed, facilitate deformation and cooperation with the first ridge 5301 for sealing, and improve the sealing performance.

[0070] Specifically, as shown in Figure 3 and Figure 5As shown, the second sealing ring 7 includes a second base and a second protruding part, the second base is embedded in the second limiting groove; the second protruding part is arranged on the side of the second base facing the membrane electrode 3 and extends out of the second sealing groove, and the structure of the second sealing ring 7 is the same as that of the first sealing ring 5. By arranging the second base in the second limiting groove and extending the second protruding part out of the second sealing groove in the natural state (as shown in Figure 3 and Figure 5 ), there is sufficient compression allowance, and when the second sealing ring 7 is pressed between the second polar plate 1 and the membrane electrode 3, the second base and the second protruding part are both compressed and deformed, so that the second base and the second protruding part are deformed and fill the entire second sealing groove (as shown in Figure 4 and Figure 6 ), and the static friction between the second sealing ring 7 and the membrane electrode 3 is increased, the stability is improved, the dislocation is prevented, and the sealing performance is improved to prevent gas leakage.

[0071] Specifically, as shown in Figure 3 and Figure 5 , the second protruding part includes a plurality of third ridges arranged at intervals along the width direction of the second base. The second protruding part is composed of a plurality of third ridges arranged at intervals, which can ensure that the plurality of third ridges can fill the entire first sealing groove 4 after compression, save materials, and reduce the pressure required when pressing the second sealing ring 7 between the second polar plate 1 and the membrane electrode 3, facilitate assembly, and the plurality of third ridges contact the membrane electrode 3, increasing the static friction between the second sealing ring 7 and the membrane electrode 3, making it more suitable for use in high-pressure hydrogen and high-pressure oxygen environments, and improving stability.

[0072] In an embodiment, the third ridge has a cross-sectional length of 1mm-2mm and a cross-sectional width of 0.2mm-0.4mm in the natural state, and the distance between adjacent two third ridges is 0.5mm-1.5mm, so as to ensure that the plurality of third ridges can fill the entire second sealing groove after compression, avoid gaps, and save materials to the maximum extent.

[0073] Specifically, as shown in Figure 3 and Figure 5 , the width of the third ridge gradually decreases in the direction towards the membrane electrode 3. The structure of the third ridge gradually decreasing in width in the direction towards the membrane electrode 3 facilitates the compression of the second polar plate 1 and the membrane electrode 3 under a certain pressure, ensures that the third ridge can fill the second sealing groove after compression and has a large friction with the membrane electrode 3, has excellent sealing performance, and avoids the displacement of the membrane electrode 3.

[0074] Specifically, as shown in Figure 3 and Figure 5As shown, the second base and the second protruding part are integrally formed. The second base and the second protruding part are integrally formed to ensure the sealing effect.

[0075] Specifically, as shown in Figure 5 , the second protruding part further comprises two fourth ridges, and the two fourth ridges are respectively arranged at two ends of the second base in the width direction, and the third ridge is located between the two fourth ridges. By increasing the two fourth ridges to assist in filling the two ends of the second sealing groove in the width direction, the sealing performance is further improved, and the problems of exposure of the second sealing ring 7 or gas leakage are more effectively prevented.

[0076] Specifically, the width of the third ridge is greater than the width of the fourth ridge, and the thickness of the third ridge is greater than the thickness of the fourth ridge. The width of the third ridge and the width of the fourth ridge adopt a proper ratio, and the thickness of the third ridge and the thickness of the fourth ridge adopt a proper ratio, so that when the second sealing ring 7 is pressed by the second polar plate 1 and the membrane electrode 3, the third ridge and the fourth ridge cooperate to fill the second sealing groove, improve the sealing performance. Preferably, the ratio of the width of the third ridge to the width of the fourth ridge is 2-3, and the ratio of the thickness of the third ridge to the thickness of the fourth ridge is 1-2.

[0077] Specifically, as shown in Figure 3 and Figure 5 , the corners of the third ridge are provided with third rounded corners. The corners of the third ridge are provided with third rounded corners for transition processing, which facilitates deformation to fill the second sealing groove under pressure and improves the sealing performance.

[0078] Specifically, as shown in Figure 5 , the corners of the fourth ridge towards the third ridge are provided with fourth rounded corners. The corners of the fourth ridge towards the third ridge are provided with fourth rounded corners for transition processing, which facilitates deformation and cooperation with the third ridge to fill the second sealing groove under pressure and improves the sealing performance.

[0079] Specifically, as shown in Figure 5 , the side of the fourth ridge close to the third ridge is inclined towards the third ridge. The inclined structure is adopted to facilitate assembly when the second polar plate 1 and the membrane electrode 3 are pressed tightly, facilitate deformation and cooperation with the third ridge for sealing, and improve the sealing performance.

[0080] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 , Figure 3 and Figure 5 , the first sealing ring 5 and the second sealing ring 7 are symmetrically arranged.

[0081] In the embodiment, the first sealing ring 5 and the second sealing ring 7 can be symmetrically arranged to ensure uniform stress of the overall structure and stability of the whole.

[0082] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 3 and Figure 5 the first sealing ring 5 is connected with the first sealing groove 4 through the first bottom glue 8.

[0083] In the embodiment, the first sealing ring 5 is connected with the first sealing groove 4 through the first bottom glue 8, which enhances the adhesion between the first sealing ring 5 and the groove bottom of the first sealing groove 4 and ensures the sealing performance.

[0084] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 3 and Figure 5 the second sealing ring 7 is connected with the second sealing groove through the second bottom glue.

[0085] In the embodiment, the second sealing ring 7 is connected with the second sealing groove through the second bottom glue, which enhances the adhesion between the second sealing ring 7 and the groove bottom of the second sealing groove and ensures the sealing performance.

[0086] Specifically, the material of the first sealing ring 5 includes at least one of silicone rubber, fluororubber, ethylene propylene diene rubber and polytetrafluoroethylene. In the embodiment, the material of the first sealing ring 5 includes at least one of silicone rubber, fluororubber, ethylene propylene diene rubber and polytetrafluoroethylene, which has a certain deformation amount to facilitate filling the first sealing groove 4 during assembly and increase the static friction with the membrane electrode 3, thereby ensuring the sealing performance.

[0087] Specifically, the material of the second sealing ring 7 includes at least one of silicone rubber, fluororubber, ethylene propylene diene rubber and polytetrafluoroethylene. In the embodiment, the material of the second sealing ring 7 includes at least one of silicone rubber, fluororubber, ethylene propylene diene rubber and polytetrafluoroethylene, which has a certain deformation amount to facilitate filling the second sealing groove during assembly and increase the static friction with the membrane electrode 3, thereby ensuring the sealing performance.

[0088] Specifically, the material of the first polar plate 2 is titanium. In the embodiment, the material of the first polar plate 2 is titanium, which improves the service life.

[0089] Specifically, the material of the second polar plate 1 is titanium. In the embodiment, the second polar plate 1 is made of titanium, which improves the service life.

[0090] The assembly and sealing principle of the sealing structure for the proton exchange membrane water electrolyzer provided by the embodiment are as follows: when the assembly is performed, the first limiting portion 51 on the first sealing ring 5 is aligned with the first limiting groove 6, and the first base 52 is bonded in the first sealing groove 4 through the first bottom glue 8; the second limiting portion on the second sealing ring 7 is aligned with the second limiting groove, and the second base is bonded in the second sealing groove through the second bottom glue; the first polar plate 2 and the second polar plate 1 sandwich the membrane electrode 3, the first polar plate 2 and the membrane electrode 3 sandwich and compress the first sealing ring 5, so that the first base 52 and the first protruding portion 53 are compressed and deformed and fill the entire first sealing groove 4, the second polar plate 1 and the membrane electrode 3 sandwich and compress the second sealing ring 7, so that the second base and the second protruding portion are compressed and deformed and fill the entire second sealing groove, to achieve sealing; the first sealing ring 5 is pressed between the first polar plate 2 and the membrane electrode 3, and the second sealing ring 7 is pressed between the second polar plate 1 and the membrane electrode 3, and the first sealing ring 5 and the second sealing ring 7 surround each inlet and outlet cavity and reaction area, so that each inlet and outlet cavity and reaction area between the second polar plate 1 and the membrane electrode 3 and between the first polar plate 2 and the membrane electrode 3 are sealed, and the first limiting portion 51 and the second limiting portion are used for limiting, to improve the stability of the first sealing ring 5 embedded in the first sealing groove 4 and the second sealing ring 7 embedded in the second sealing groove, and the first protruding portion 53 in the first sealing ring 5 and the second protruding portion in the second sealing ring 7 cooperate with the membrane electrode 3, to increase the static friction force between the first sealing ring 5 and the second sealing ring 7 and the membrane electrode 3, so that the whole is not easy to move out of position under high pressure, to avoid movement of the first sealing ring 5 and the second sealing ring 7 under high pressure, to prevent problems such as leakage of the first sealing ring 5 and the second sealing ring 7 or gas leakage, to ensure safe and stable operation of the electrolyzer, and to solve the technical problem that the sealing ring in the sealing groove of the bipolar plate of the sealing structure of the existing proton exchange membrane water electrolyzer has a tendency to move outward in the environment of high-pressure hydrogen and high-pressure oxygen, and is prone to problems such as exposure of the sealing ring or gas leakage, affecting safe and stable operation of the electrolyzer.

[0091] Embodiment 3

[0092] Please refer to Figure 1 The embodiment provides an electrolyzer, which comprises a first polar plate 2, a second polar plate 1 and a membrane electrode, the membrane electrode is sandwiched between the first polar plate 2 and the second polar plate 1, and a sealing structure is arranged between the membrane electrode 3 and the first polar plate 2 and the second polar plate 1 on both sides of the membrane electrode, and the sealing structure adopts the sealing structure for the proton exchange membrane water electrolyzer as in the embodiments 1 or 2.

[0093] In the embodiment, the electrolytic tank is sealed between the membrane electrode 3 and the first and second polar plates 2, 1 on both sides of the membrane electrode 3 by adopting the sealing structure for the proton exchange membrane water electrolytic tank of the embodiment 1 or the embodiment 2, and the specific structure of the sealing structure for the proton exchange membrane water electrolytic tank is the same as that of the embodiment 1 or the embodiment 2. The electrolytic tank with the sealing structure for the proton exchange membrane water electrolytic tank has at least the same technical effects as the sealing structure for the proton exchange membrane water electrolytic tank described above, and the specific principle is the same as that of the embodiment 1 or the embodiment 2, which will not be described here one by one. The sealing structure of the existing proton exchange membrane water electrolytic tank solves the technical problem that the sealing ring in the sealing groove of the bipolar plate has a tendency to move outward in the environment of high-pressure hydrogen and high-pressure oxygen, and is prone to problems such as exposure of the sealing ring or gas leakage, which affects the safe and stable operation of the electrolytic tank.

[0094] Obviously, the above embodiments are only examples for clearly illustrating but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A sealing structure for a proton exchange membrane water electrolyzer, the sealing structure being disposed between the membrane electrode (3) and its two sides, a first electrode plate (2) and a second electrode plate (1), characterized in that, The sealing structure includes a sealing body and a limiting structure. The limiting structure includes a first limiting structure and a second limiting structure arranged around the sealing body. The sealing body includes a first sealing groove (4) and a first sealing ring (5) arranged between the first electrode plate (2) and the membrane electrode (3), and a second sealing groove and a second sealing ring (7) arranged between the second electrode plate (1) and the membrane electrode (3). The first sealing groove (4) is arranged on the first electrode plate (2), and the first sealing ring (5) is embedded in the first sealing groove (4). The second sealing groove is arranged on the second electrode plate (1), and the second sealing ring (7) is embedded in the second sealing groove. The first limiting structure includes a first limiting groove (6) and a first limiting part (51), with at least one first limiting part (51) provided around the first sealing ring (5) and a matching first limiting groove (6) provided around the first sealing groove (4); the second limiting structure includes a second limiting groove and a second limiting part, with at least one second limiting part provided around the second sealing ring (7) and a matching second limiting groove provided around the second sealing groove.

2. The sealing structure for a proton exchange membrane water electrolyzer according to claim 1, characterized in that, The second sealing groove has the same structure as the first sealing groove (4). The first sealing groove (4) includes a first groove body (41) and two second groove bodies (42). The first groove body (41) is arranged around the periphery of the reaction area of ​​the first electrode plate (2). The two second groove bodies (42) are respectively arranged on both sides of the first groove body (41). The shape of the second groove body (42) is adapted to the arrangement shape of the first opening (9) on the first electrode plate (2). The second groove body (42) communicates with the first groove body (41) and surrounds the periphery of each first opening (9). The first groove body (41) is provided with the first limiting groove (6) at the entrance and exit channel of the reaction area of ​​the first electrode plate (2), and / or, the second groove body (42) is provided with the first limiting groove (6) on the side away from the first groove body (41).

3. The sealing structure for a proton exchange membrane water electrolyzer according to claim 2, characterized in that, The second groove (42) is provided with the first limiting groove (6) in the middle of the side opposite to the first groove (41).

4. The sealing structure for a proton exchange membrane water electrolyzer according to claim 1, characterized in that, The first sealing ring (5) includes a first base (52) and a first protrusion (53). The first base (52) is embedded in the first sealing groove (4). The first protrusion (53) is disposed on the side of the first base (52) facing the membrane electrode (3) and extends out of the first sealing groove (4). The second sealing ring (7) has the same structure as the first sealing ring (5).

5. The sealing structure for a proton exchange membrane water electrolyzer according to claim 4, characterized in that, The first protrusion (53) includes a plurality of first protruding ridges (5301) spaced apart along the width direction of the first base (52).

6. The sealing structure for a proton exchange membrane water electrolyzer according to claim 5, characterized in that, The width of the first protrusion (5301) gradually decreases along the direction toward the membrane electrode (3); And / or, the first base (52) and the first protrusion (53) are integrally formed; And / or, the corners of the first protruding edge (5301) are provided with a first rounded corner.

7. The sealing structure for a proton exchange membrane water electrolyzer according to claim 5 or 6, characterized in that, The first protrusion (53) further includes two second protrusions (5302), which are respectively disposed at both ends of the first base (52) along the width direction, and the first protrusion (5301) is located between the two second protrusions (5302).

8. The sealing structure for a proton exchange membrane water electrolyzer according to claim 7, characterized in that, The width of the first protruding ridge (5301) is greater than the width of the second protruding ridge (5302), and the thickness of the first protruding ridge (5301) is greater than the thickness of the second protruding ridge (5302). And / or, the corners of the second protruding edge (5302) facing the first protruding edge (5301) are provided with a second rounded corner; And / or, the second protruding ridge (5302) is inclined toward the first protruding ridge (5301) on the side closest to the first protruding ridge (5301).

9. The sealing structure for a proton exchange membrane water electrolyzer according to claim 1, characterized in that, The first sealing ring (5) and the second sealing ring (7) are arranged symmetrically.

10. An electrolytic cell, characterized in that, It includes a first electrode plate (2), a second electrode plate (1), and a membrane electrode. The membrane electrode is sandwiched between the first electrode plate (2) and the second electrode plate (1). A sealing structure is provided between the membrane electrode (3) and the first electrode plate (2) and the second electrode plate (1) on both sides. The sealing structure adopts the sealing structure for a proton exchange membrane water electrolyzer as described in any one of claims 1-9.

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