Pem electrolytic cell, pem electrolytic device, and pem electrolytic system

Abstract

The utility model belongs to electrolytic water hydrogen production device technical field discloses a kind of PEM electrolytic unit, PEM electrolytic device and PEM electrolysis system. At least two PEM electrolytic unit laminated settings form PEM electrolytic device, and PEM electrolytic unit includes positioning frame, bipolar plate assembly and membrane electrode. The periphery of positioning frame is equipped with ridge structure, and the inside of ridge structure forms positioning space, and the opposite sides of ridge structure are respectively provided with insertion hole and insertion projection, and the insertion projection of one PEM electrolytic unit can be inserted and connected in the insertion hole of another PEM electrolytic unit. Bipolar plate assembly is located in positioning space, and bipolar plate assembly is abutted to the inner wall of ridge structure. Membrane electrode is located in positioning space, and is laminated in the side of the bottom of bipolar plate assembly away from positioning frame, and membrane electrode is abutted to the inner wall of ridge structure. PEM electrolytic unit can prevent misplacement in packaging process, improve press-fitting reliability and stacking convenience, guarantee the performance of PEM electrolytic device electrolytic hydrogen production.

Description

Technical Field

[0001] This utility model relates to the technical field of water electrolysis hydrogen production devices, and in particular to a PEM electrolysis unit, a PEM electrolysis device, and a PEM electrolysis system. Background Technology

[0002] A PEM electrolyzer (proton exchange membrane electrolyzer) is a core device for producing hydrogen through water electrolysis using proton exchange membrane technology. It features a compact structure, fast dynamic response, and high hydrogen purity. As the core component of water electrolysis for hydrogen production, the stable operation of the PEM electrolyzer directly affects the efficiency of hydrogen production.

[0003] In traditional PEM electrolyzers, during the stacking process, external positioning rods are typically used to position the two sides of the bipolar plates, or positioning pin holes are set inside the bipolar plates to position the bipolar plates and membrane electrodes.

[0004] The two positioning methods described above have the following drawbacks: When using external positioning rods to position the two sides of the bipolar plates, very rigid positioning rods are usually required. However, these positioning rods are heavy, and when there are a large number of bipolar plates, the positioning of the positioning rods is prone to errors. Furthermore, during the press-fitting process of the PEM electrolyzer, the bipolar plates and membrane electrodes can also become misaligned, causing the titanium felt to shift, affecting the mass transfer effect and leading to the failure of the PEM electrolyzer's seal.

[0005] When using internal locating pins, it is necessary to ensure their rigidity and insulation performance. However, due to the small size of the locating pin holes, it is difficult to guarantee the rigidity of the pins, and they are prone to breakage during the pressing process due to changes in internal stress. Furthermore, during the disassembly and maintenance of PEM electrolytic cells, the locating pins are difficult to remove due to internal stress, causing inconvenience in maintenance.

[0006] Therefore, there is an urgent need for a PEM electrolysis unit, PEM electrolysis device, and PEM electrolysis system to solve the above problems. Utility Model Content

[0007] According to one aspect of the present invention, the objective is to provide a PEM electrolysis unit that can prevent misalignment during the packaging process, improve the reliability of press-fitting and the convenience of stacking, thereby ensuring the performance of the PEM electrolysis device in producing hydrogen.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] A PEM electrolysis unit, wherein at least two PEM electrolysis units are stacked to form a PEM electrolysis device, the PEM electrolysis unit comprising:

[0010] The positioning frame has a ridge structure around its periphery, and a positioning space is formed inside the ridge structure. The ridge structure has insertion holes and insertion protrusions on opposite sides in the thickness direction of the positioning frame. The insertion protrusion of one PEM electrolysis unit can be inserted into the insertion hole of another PEM electrolysis unit.

[0011] A bipolar plate assembly is disposed in the positioning space, and the periphery of the bipolar plate assembly abuts against the inner wall of the ridge structure.

[0012] A membrane electrode is disposed in the positioning space and stacked on the side of the bipolar plate assembly away from the bottom of the positioning frame, with the periphery of the membrane electrode abutting against the inner wall of the ridge structure.

[0013] As a preferred embodiment of the PEM electrolysis unit provided by this utility model, the bipolar plate assembly includes a bipolar plate body, a cathode gas diffusion layer and an anode gas diffusion layer, wherein the cathode gas diffusion layer and the anode gas diffusion layer are respectively disposed on opposite sides of the bipolar plate body; the positioning frame is provided with a first diffusion layer positioning groove, wherein one of the cathode gas diffusion layer and the anode gas diffusion layer facing the positioning frame is embedded in the first diffusion layer positioning groove.

[0014] As a preferred embodiment of the PEM electrolysis unit provided by this utility model, the positioning frame is provided with a first positioning sealing structure in the positioning space, and the first positioning sealing structure abuts against the bipolar plate assembly.

[0015] As a preferred embodiment of the PEM electrolysis unit provided by this utility model, a second positioning sealing structure is provided on the side of the positioning frame away from the positioning space, and the second positioning sealing structure of one PEM electrolysis unit can abut against the membrane electrode of another PEM electrolysis unit.

[0016] As a preferred embodiment of the PEM electrolysis unit provided by this utility model, the bipolar plate assembly includes a bipolar plate body, a cathode gas diffusion layer and an anode gas diffusion layer, wherein the cathode gas diffusion layer and the anode gas diffusion layer are respectively disposed on opposite sides of the bipolar plate body;

[0017] The PEM electrolysis unit further includes an insulating frame disposed between the bipolar plate assembly and the membrane electrode; the insulating frame is provided with a second diffusion layer positioning groove, and one of the cathode gas diffusion layer and the anode gas diffusion layer facing the insulating frame is embedded in the second diffusion layer positioning groove.

[0018] As a preferred embodiment of the PEM electrolysis unit provided by this utility model, a first insulating sealing structure and a second insulating sealing structure are respectively provided on opposite sides of the insulating frame. The first insulating sealing structure abuts against the membrane electrode, and the second insulating sealing structure abuts against the bipolar plate assembly.

[0019] As a preferred embodiment of the PEM electrolysis unit provided by this utility model, the bipolar plate assembly is provided with a connection terminal, which can extend out of the positioning frame and be connected to an external voltage detection device.

[0020] As a preferred embodiment of the PEM electrolysis unit provided by this utility model, the ridge structure has an avoidance groove, which can accommodate the connection terminal and allow the connection terminal to extend out of the positioning frame.

[0021] According to another aspect of the present invention, the object is to provide a PEM electrolysis device, the PEM electrolysis device comprising at least two PEM electrolysis units as described in any of the above embodiments, the two PEM electrolysis units being stacked.

[0022] According to another aspect of the present invention, the object is to provide a PEM electrolysis system, the PEM electrolysis system comprising the PEM electrolysis device as described above.

[0023] The beneficial effects of this utility model are:

[0024] The PEM electrolysis unit provided by this utility model includes a positioning frame, a bipolar plate assembly, and a membrane electrode. The positioning frame has a ridge structure along its periphery, forming a positioning space within the ridge structure. This positioning frame integrates the bipolar plate assembly and the membrane electrode, improving the overall structural integrity of the PEM electrolysis unit. The bipolar plate assembly is disposed within the positioning space, with its periphery abutting against the inner wall of the ridge structure. The membrane electrode is disposed within the positioning space, stacked on the side of the bipolar plate assembly facing away from the bottom of the positioning frame, with its periphery abutting against the inner wall of the ridge structure. Through the limiting effect of the aforementioned ridge structure, when packaging the PEM electrolysis unit, only the bipolar plate assembly and the membrane electrode need to be sequentially placed into the positioning space, thus avoiding misalignment between the structures and improving the reliability of the press-fitting process. The ridge structure has insertion holes and insertion protrusions on opposite sides of the positioning frame in the thickness direction. The insertion protrusion of one PEM electrolysis unit can be inserted into the insertion hole of another PEM electrolysis unit. Through the cooperation of the insertion protrusion and insertion hole, the efficiency and convenience of stacking and assembling two PEM electrolysis units can be improved, thereby ensuring the performance of the PEM electrolysis device in producing hydrogen.

[0025] The PEM electrolysis device provided by this utility model includes at least two stacked PEM electrolysis units, so that a cathode and an anode are formed on a single membrane electrode, thereby achieving the purpose of producing hydrogen from water by electrolysis. The PEM electrolysis device is easy to assemble and has high reliability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the PEM electrolysis unit provided in this embodiment of the present invention;

[0028] Figure 2 This is an exploded view of the PEM electrolysis unit provided in this embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional view of the PEM electrolysis unit provided in this embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the positioning frame provided in an embodiment of the present invention. Figure 1 ;

[0031] Figure 5 yes Figure 4 A magnified view of a section marked A in the middle;

[0032] Figure 6 This is a schematic diagram of the positioning frame provided in an embodiment of the present invention. Figure 2 ;

[0033] Figure 7 yes Figure 6 A magnified view of a section marked B in the middle;

[0034] Figure 8 yes Figure 6 A magnified view of the structure marked C in the middle.

[0035] In the picture:

[0036] 100. Positioning frame; 110. Raised ridge structure; 120. Insertion hole; 130. Insertion protrusion; 140. First diffusion layer positioning groove; 150. First positioning sealing structure; 160. Second positioning sealing structure; 170. Avoidance groove;

[0037] 200. Bipolar plate assembly; 210. Bipolar plate body; 220. Cathode gas diffusion layer; 230. Anode gas diffusion layer; 240. Connecting terminal;

[0038] 300. Membrane electrode;

[0039] 400, Insulating frame; 410, Second diffusion layer positioning groove; 420, First insulating sealing structure; 430, Second insulating sealing structure. Detailed Implementation

[0040] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] This embodiment provides a PEM electrolysis unit, a PEM electrolysis apparatus, and a PEM electrolysis system. The PEM electrolysis apparatus includes at least two PEM electrolysis units, with adjacent PEM electrolysis units stacked on top of each other. In this embodiment, an example of a PEM electrolysis apparatus comprising two stacked PEM electrolysis units is described. The PEM electrolysis system includes the PEM electrolysis apparatus provided in this embodiment.

[0050] Figure 1 This diagram shows a structural schematic of the PEM electrolysis unit provided in an embodiment of the present invention. Figure 2 An exploded view of the PEM electrolysis unit provided in an embodiment of the present invention is shown; Figure 3 A cross-sectional view of a PEM electrolysis unit provided in an embodiment of the present invention is shown. (Refer to...) Figures 1-3The PEM electrolysis unit provided in this embodiment includes a positioning frame 100, a bipolar plate assembly 200, and a membrane electrode 300.

[0051] Specifically, the positioning frame 100 has a ridge structure 110 around its periphery, and the interior of the ridge structure 110 forms a positioning space. The bipolar plate assembly 200 is disposed in the positioning space, and its periphery abuts against the inner wall of the ridge structure 110. The membrane electrode 300 is disposed in the positioning space, stacked on the side of the bipolar plate assembly 200 away from the bottom of the positioning frame 100, and its periphery abuts against the inner wall of the ridge structure 110. The positioning frame 100 integrates components such as the bipolar plate assembly 200 and the membrane electrode 300, improving the overall structural integrity of the PEM electrolysis unit. Through the limiting effect of the ridge structure 110, when packaging the PEM electrolysis unit, only the bipolar plate assembly 200 and the membrane electrode 300 need to be placed sequentially into the positioning space, thus avoiding misalignment between the structures in the positioning frame 100 and improving the reliability of the press-fitting. After the PEM electrolysis unit is press-fitted, the upper surface of the membrane electrode 300 is flush with the upper end face of the ridge structure 110.

[0052] More specifically, the bipolar plate assembly 200 includes a bipolar plate body 210, a cathode gas diffusion layer 220, and an anode gas diffusion layer 230. The bipolar plate body 210 has a cathode side and an anode side on opposite sides, respectively. The cathode gas diffusion layer 220 is disposed on the cathode side of the bipolar plate body 210, and the anode gas diffusion layer 230 is disposed on the anode side of the bipolar plate body 210. The cathode gas diffusion layer 220 and the anode gas diffusion layer 230 can be made of metal materials, such as porous titanium plates or titanium felt. The membrane electrode 300 can be a proton exchange membrane with a structure in which platinum-carbon cathode catalyst layer and iridium black anode catalyst layer are coated on both sides of the membrane. Both ends of the bipolar plate body 210 are provided with first channels for water and gas. Exemplarily, in this embodiment, the cathode gas diffusion layer 220 is located below the bipolar plate body 210, and the anode gas diffusion layer 230 is disposed above the bipolar plate body 210. With the above configuration, after the two PEM electrolysis units are stacked, the membrane electrode 300 of the lower PEM electrolysis unit can be sandwiched between the anode gas diffusion layer 230 of the same PEM electrolysis unit and the cathode gas diffusion layer 220 of the upper PEM electrolysis unit.

[0053] Continue to refer to Figure 2The positioning frame 100 is provided with a first diffusion layer positioning groove 140. One of the cathode gas diffusion layer 220 and the anode gas diffusion layer 230, facing the positioning frame 100, can be embedded in the first diffusion layer positioning groove 140. In this embodiment, specifically, the cathode gas diffusion layer 220 is embedded in the first diffusion layer positioning groove 140. The first diffusion layer positioning groove 140 helps to limit the position of the cathode gas diffusion layer 220, ensuring the accuracy of its position during the press-fitting process of the PEM electrolysis unit and preventing misalignment.

[0054] Specifically, the positioning frame 100 is provided with a second channel corresponding to the position of the first channel on the bipolar plate body 210, and the second channel can communicate with the first channel.

[0055] More specifically, the positioning frame 100 has a first positioning sealing structure 150 within the positioning space, and the first positioning sealing structure 150 abuts against the bipolar plate body 210. Specifically, the first positioning sealing structure 150 has a frame structure, with one part surrounding the first diffusion layer positioning groove 140 and another part surrounding the second channel. In this embodiment, the first positioning sealing structure 150 can specifically be a rubber sealing strip.

[0056] More specifically, the positioning frame 100 is provided with a first positioning sealing groove in the positioning space, and the first positioning sealing structure 150 is specifically disposed in the first positioning sealing groove. During the pressing process of each component of the PEM electrolysis unit, the first positioning sealing structure 150 and the bipolar plate body 210 are reliably fitted together and will not be offset during the pressing process, thus ensuring the reliability of the seal.

[0057] Figure 4 This diagram illustrates the structure of the positioning frame provided in an embodiment of the present invention. Figure 1 . Reference Figure 4 The positioning frame 100 has a second positioning sealing structure 160 on the side opposite to the positioning space. The second positioning sealing structure 160 of one PEM electrolysis unit can abut against the membrane electrode 300 of another PEM electrolysis unit. A portion of the second positioning sealing structure 160 is disposed around the first diffusion layer positioning groove 140, and another portion can be disposed around the second channel.

[0058] Specifically, the positioning frame 100 is provided with a second positioning sealing groove on the side opposite to the positioning space. The second positioning sealing structure 160 is specifically disposed in the second positioning sealing groove. During the pressing process of each component of the PEM electrolysis unit, the second positioning sealing structure 160 is reliably attached to the membrane electrode 300 of another PEM electrolysis unit, and will not be offset during the pressing process, thus ensuring the reliability of the seal.

[0059] Continue to refer to Figure 2 The PEM electrolysis unit also includes an insulating frame 400. The insulating frame 400 is disposed between the bipolar plate assembly 200 and the membrane electrode 300, and its peripheral portion can also abut against the inner wall of the ridge structure 110. The insulating frame 400 is provided with a second diffusion layer positioning groove 410, in which one of the cathode gas diffusion layer 220 and the anode gas diffusion layer 230 facing the insulating frame 400 is embedded. In this embodiment, the anode gas diffusion layer 230 is embedded in the second diffusion layer positioning groove 410.

[0060] Specifically, the insulating frame 400 is provided with a third channel corresponding to the position of the first channel on the bipolar plate body 210, and the third channel can communicate with the first channel.

[0061] More specifically, a first insulating sealing structure 420 and a second insulating sealing structure 430 are respectively provided on opposite sides of the insulating frame 400. The first insulating sealing structure 420 abuts against the membrane electrode 300, and the second insulating sealing structure 430 abuts against the bipolar plate assembly 200. In this embodiment, a portion of the first insulating sealing structure 420 is disposed around the second diffusion layer positioning groove 410, and another portion is disposed around the third channel. Similarly, a portion of the second insulating sealing structure 430 is disposed around the second diffusion layer positioning groove 410, and another portion is disposed around the third channel.

[0062] Figure 5 Show Figure 4 A magnified view of the structure marked A in the middle. Figure 6 This diagram illustrates the structure of the positioning frame provided in an embodiment of the present invention. Figure 2 ; Figure 7 Show Figure 6 A magnified view of the structure marked B in the middle section. (Refer to...) Figures 4-7 The ridge structure 110 has insertion holes 120 and insertion protrusions 130 on opposite sides of the positioning frame 100 in the thickness direction. The insertion protrusion 130 of one PEM electrolysis unit can be inserted into the insertion hole 120 of another PEM electrolysis unit. Through the cooperation of the insertion protrusion 130 and the insertion hole 120, the efficiency and convenience of stacking and assembling two PEM electrolysis units can be improved, thereby ensuring the performance of the PEM electrolysis device in producing hydrogen.

[0063] Preferably, one side of the ridge structure 110 is provided with a plurality of insertion protrusions 130 spaced apart, and the other side of the ridge structure 110 is provided with a plurality of insertion holes 120 spaced apart, with each insertion protrusion 130 corresponding to one insertion hole 120. This arrangement increases the reliability of the connection between the two stacked PEM electrolysis units and the uniformity of the stress distribution.

[0064] Figure 8 Show Figure 6 A magnified view of the structure marked C in the middle. (Refer to...) Figure 2 and Figure 8 The bipolar plate assembly 200 is provided with a connection terminal 240, which can extend out of the positioning frame 100 and be connected to an external voltage detection device for easy voltage detection. The ridge structure 110 has a relief groove 170, which can accommodate the connection terminal 240 and allow the connection terminal 240 to extend out of the positioning frame 100.

[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A PEM electrolysis unit, characterized in that, At least two of the PEM electrolysis units are stacked to form a PEM electrolysis device, wherein the PEM electrolysis unit includes: A positioning frame (100) is provided with a ridge structure (110) around its periphery. The interior of the ridge structure (110) forms a positioning space. The ridge structure (110) is provided with a plug hole (120) and a plug protrusion (130) on opposite sides of the thickness direction of the positioning frame (100). The plug protrusion (130) of one PEM electrolysis unit can be plugged into the plug hole (120) of another PEM electrolysis unit. A bipolar plate assembly (200) is disposed in the positioning space, and the periphery of the bipolar plate assembly (200) abuts against the inner wall of the ridge structure (110); A membrane electrode (300) is disposed in the positioning space and stacked on the side of the bipolar plate assembly (200) away from the bottom of the positioning frame (100). The periphery of the membrane electrode (300) abuts against the inner wall of the ridge structure (110).

2. The PEM electrolysis unit according to claim 1, characterized in that, The bipolar plate assembly (200) includes a bipolar plate body (210), a cathode gas diffusion layer (220), and an anode gas diffusion layer (230), wherein the cathode gas diffusion layer (220) and the anode gas diffusion layer (230) are respectively disposed on opposite sides of the bipolar plate body (210); the positioning frame (100) is provided with a first diffusion layer positioning groove (140), wherein one of the cathode gas diffusion layer (220) and the anode gas diffusion layer (230) facing the positioning frame (100) is embedded in the first diffusion layer positioning groove (140).

3. The PEM electrolysis unit according to claim 1, characterized in that, The positioning frame (100) is provided with a first positioning sealing structure (150) in the positioning space, and the first positioning sealing structure (150) abuts against the bipolar plate assembly (200).

4. The PEM electrolysis unit according to claim 1, characterized in that, The positioning frame (100) is provided with a second positioning sealing structure (160) on the side opposite to the positioning space. The second positioning sealing structure (160) of one PEM electrolysis unit can abut against the membrane electrode (300) of another PEM electrolysis unit.

5. The PEM electrolysis unit according to claim 1, characterized in that, The bipolar plate assembly (200) includes a bipolar plate body (210), a cathode gas diffusion layer (220), and an anode gas diffusion layer (230), wherein the cathode gas diffusion layer (220) and the anode gas diffusion layer (230) are respectively disposed on opposite sides of the bipolar plate body (210); The PEM electrolysis unit further includes an insulating frame (400) disposed between the bipolar plate assembly (200) and the membrane electrode (300); the insulating frame (400) is provided with a second diffusion layer positioning groove (410), and one of the cathode gas diffusion layer (220) and the anode gas diffusion layer (230) facing the insulating frame (400) is embedded in the second diffusion layer positioning groove (410).

6. The PEM electrolysis unit according to claim 5, characterized in that, The insulating frame (400) has a first insulating sealing structure (420) and a second insulating sealing structure (430) respectively provided on opposite sides. The first insulating sealing structure (420) abuts against the membrane electrode (300), and the second insulating sealing structure (430) abuts against the bipolar plate assembly (200).

7. The PEM electrolysis unit according to claim 1, characterized in that, The bipolar plate assembly (200) is provided with a connection terminal (240), which can extend out of the positioning frame (100) and be connected to an external voltage detection device.

8. The PEM electrolysis unit according to claim 7, characterized in that, The ridge structure (110) has a relief groove (170) which can accommodate the connecting terminal (240) and allow the connecting terminal (240) to extend out of the positioning frame (100).

9. A PEM electrolysis apparatus, characterized in that, The PEM electrolysis device includes at least two PEM electrolysis units as described in any one of claims 1-8, wherein the two PEM electrolysis units are stacked.

10. A PEM electrolysis system, characterized in that, The PEM electrolysis system includes the PEM electrolysis device as described in claim 9.

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