A stack clamping device, electrolytic cell and hydrogen fuel cell

Abstract

The application relates to a stack clamping device, an electrolytic cell and a hydrogen fuel cell. The stack clamping device comprises a frame and two end plates. The frame is provided with connecting ends at two ends in a first direction. The two end plates are arranged at the two connecting ends respectively, and the frame and the two end plates form a containing cavity for containing a stack. The side wall of the frame is provided with a wire outlet hole for the wire outlet end of the current collecting plate of the stack to pass through. The distance between the two end plates is adjustable. The stack clamping device can simplify the clamping operation of the stack, improve the installation efficiency, and prevent the end plate from tilting.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, specifically to a fuel cell stack clamping device, an electrolyzer, and a hydrogen fuel cell. Background Technology

[0002] A hydrogen fuel cell stack consists of multiple individual cells connected in series or parallel to increase output voltage and current, thereby meeting the power requirements of practical applications. The stack clamping device typically uses a combination of screws, nuts, and two end plates for clamping. The screw passes through the two end plates and engages with the nuts to tighten the two end plates, thereby clamping the stack between the two end plates.

[0003] However, due to the large number of screws and nuts, the locking process is complicated. When clamping the fuel cell stack, it is necessary to repeatedly adjust the installation torque of each screw, resulting in low installation efficiency. In addition, problems such as end plate tilting are also prone to occur. Utility Model Content

[0004] This application provides a fuel cell stack clamping device, an electrolyzer, and a hydrogen fuel cell, which can simplify the clamping operation of the fuel cell stack, improve installation efficiency, and prevent the end plate tilting problem.

[0005] This application provides a fuel cell stack clamping device, including a frame and two end plates; the two ends of the frame along a first direction are respectively formed as connecting ends, and the two end plates are respectively disposed at the two connecting ends, and together with the frame, form a receiving cavity for accommodating the fuel cell stack; the side wall of the frame is provided with a wire outlet hole, which is used for the current collector wire outlet end of the fuel cell stack to pass through; the distance between the two end plates is adjustable.

[0006] In some embodiments, at least one of the end plates is a support plate, and the support plate is threadedly connected to the connecting end.

[0007] In some embodiments, the side wall of the support plate facing the receiving cavity forms an inner wall surface, and the inner wall surface is provided with an annular protrusion, which is threadedly connected to the connecting end.

[0008] In some embodiments, the connecting end is provided with a first limiting part, the support plate is provided with a second limiting part, the support plate is threadedly connected to the connecting end, and the first limiting part and the second limiting part abut against each other.

[0009] In some embodiments, the side wall of the support plate away from the receiving cavity forms an outer wall surface, and the outer wall surface is further provided with a rotational fitting structure for cooperating with and rotating synchronously with the installation tool.

[0010] In some embodiments, the outer wall surface is provided with a plurality of the rotary mating structures at circumferential intervals.

[0011] In some embodiments, the end plate is an insulating plate;

[0012] Alternatively, the end plate may include a metal plate and an insulating plate, the insulating plate being disposed on the side of the metal plate facing the receiving cavity.

[0013] In some embodiments, at least one of the end plates is further provided with an elastic element and a pressure plate on the side facing the receiving cavity, the elastic element being sandwiched between the pressure plate and the end plate.

[0014] In some embodiments, the elastic element is a disc spring, the end plate is provided with a first annular groove, the pressure plate is provided with a second annular groove, one end of the disc spring abuts against the bottom wall of the first annular groove, and the other end of the disc spring abuts against the bottom wall of the second annular groove.

[0015] In some embodiments, the pressure plate is further provided with a positioning boss, and the end plate is an annular structure with a central hole. The positioning boss passes through the elastic member and is positioned and engaged with the central hole.

[0016] In some embodiments, the sidewalls of the frame are further provided with weight-reduction holes.

[0017] In some embodiments, the frame is an insulating frame;

[0018] Alternatively, the frame may be a metal frame, and the inner wall of the frame may also be provided with insulating components.

[0019] In some embodiments, the frame forms an inner sidewall facing one side of the receiving cavity, and the inner sidewall protrudes toward one side of the receiving cavity and is provided with at least two insulating members, each of the insulating members being spaced apart, the insulating members extending along the first direction, the insulating members being used to cooperate with the fuel cell stack to form a gap between the outer wall surface of the fuel cell stack and the inner sidewall.

[0020] In some embodiments, the inner sidewall is provided with a protruding ridge, the protruding ridge extends along the first direction, and the outer wall surface of the protruding ridge is covered with an insulating layer to form the insulating component.

[0021] This application also provides an electrolytic cell, including a fuel cell stack and a fuel cell stack clamping device as described above.

[0022] This application also provides a hydrogen fuel cell, including the electrolyzer described above.

[0023] The fuel cell stack clamping device, electrolyzer, and hydrogen fuel cell provided in this application have the following technical advantages:

[0024] The end plates are detachably connected to the frame, facilitating fuel cell stack assembly. The spacing between the two end plates is adjustable to clamp the fuel cell stack within the housing cavity. Furthermore, connecting the support plate to the frame simplifies installation, making end plate assembly and disassembly convenient without repeated adjustments, resulting in high installation efficiency. This also ensures even force distribution across the end plates, preventing tilting. In the installed state, the clamping force on the fuel cell stack is more uniform and provides better stability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an electrolytic cell provided in an embodiment of this application;

[0026] Figure 2 yes Figure 1 Schematic diagram of the middle support plate;

[0027] Figure 3 This is a structural schematic diagram of the support plate from another perspective;

[0028] Figure 4 This is a schematic diagram of the electrolytic cell from another perspective;

[0029] Figure 5 This is a structural diagram showing the installation of the end plate using installation tools;

[0030] Figure 6 This is a cross-sectional view of an electrolytic cell;

[0031] Figure 7 yes Figure 6 A magnified view of a portion of the image;

[0032] Figure 8 yes Figure 6 A schematic diagram of the structure of the insulating plate in the diagram;

[0033] Figure 9 yes Figure 6 A schematic diagram of the structure of the pressure plate in the middle;

[0034] Figure 10 This is a structural diagram of the framework;

[0035] Figure 11 This is an exploded view of an electrolytic cell;

[0036] Figure 12 This is a schematic diagram of the fuel cell stack.

[0037] Appendix Figures 1-12 The reference numerals in the attached figures are explained as follows:

[0038] 1 Frame, 11 Connecting end, 12 Outlet hole, 13 First limiting part, 14 Weight reduction hole, 15 Insulating component, 151 Protruding ridge, 152 Insulating layer, 16 Inner side wall;

[0039] 2. End plate, 21. Support plate, 22. Inner wall surface, 23. Annular protrusion, 24. Second limiting part, 25. Outer wall surface, 26. Rotary mating structure, 27. Positioning groove, 28. Metal plate, 29. Insulating plate, 210. First annular groove, 211. Center hole.

[0040] 3 elastic part, 31 elastic element, 32 pressure plate, 321 second annular groove, 322 second mating groove, 323 positioning boss;

[0041] 4. Wear-resistant rings;

[0042] 5. Fuel cell stack, 51. Current collector plate, 511. Current collector plate output terminal, 52. Single cell, 521. Bipolar plate, 522. Gas diffusion layer, 523. Proton exchange membrane, 524. Catalyst, 53. First coordination tank.

[0043] 6. Installation tools, 61. Matching protrusions. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] A hydrogen fuel cell stack consists of multiple individual cells connected in series or parallel to increase output voltage and current, thereby meeting the power requirements of practical applications. The stack clamping device typically uses a combination of screws, nuts, and two end plates for clamping. The screws pass through the two end plates and engage with the nuts to tighten the end plates, thus clamping the stack between them. However, due to the large number of screws and nuts, the clamping process is complex. During stack clamping, the installation torque of each screw needs to be repeatedly adjusted, resulting in low installation efficiency and a tendency for end plate tilting to occur.

[0046] This application provides an embodiment of an electric stack clamping device, such as... Figure 1 As shown, the fuel cell stack clamping device includes a frame 1 and two end plates 2. The two ends of the frame 1 along the first direction form connecting ends 11, and the two end plates 2 are respectively disposed at the two connecting ends 11. The frame 1 and the end plates 2 enclose a receiving cavity, which is used to receive the fuel cell stack 5. The distance between the two end plates 2 is adjustable to adjust the size of the receiving cavity along the first direction, so that the two end plates 2 can clamp the fuel cell stack 5 located in the receiving cavity from both ends.

[0047] The fuel cell stack 5 includes a current collector plate 51, which has a current collector plate output terminal 511. The current collector plate output terminal 511 needs to be connected to an external power source or load. In the fuel cell stack clamping device provided in this embodiment, the side wall of the frame 1 is provided with an output hole 12. The output hole 12 is used for the current collector plate output terminal 511 of the fuel cell stack 5 to pass through. After the fuel cell stack 5 is installed in the receiving cavity formed by the frame 1 and the end plate 2, the current collector plate output terminal 511 can pass through the output hole 12 to the outside of the receiving cavity, so as to facilitate connection with an external power source or load.

[0048] Frame 1 can be a one-piece structure, such as a cylindrical structure. Frame 1 can also be a structure consisting of at least two parts arranged circumferentially. When connected, each part is spliced ​​together circumferentially and connected to the end plate 2 to enclose and form a receiving cavity.

[0049] Compared to the solution of clamping the two end plates 2 to both ends of the fuel cell stack 5 using multiple circumferentially arranged screws, the connection between the end plates 2 and the connecting end 11 of the frame 1 makes the disassembly and assembly of the end plates 2 more convenient, without the need for repeated adjustment of the end plates 2, resulting in higher installation efficiency. At the same time, it can also ensure that the end plates 2 are subjected to uniform force in all directions around the circumference, thus avoiding tilting. In the installed state, the clamping force on the fuel cell stack 5 is more uniform and the stability is better.

[0050] Of the two end plates 2, at least one end plate 2 is a support plate 21, and the support plate 21 is threadedly connected to the connecting end 11 of the frame 1. Both end plates 2 can be support plates 21, meaning that each end plate 2 is threadedly connected to one of the two connecting ends 11 of the frame 1; alternatively, one end plate 2 can be a support plate 21, and the other end plate 2 can be a fixed plate that is fixed to the frame 1 and cannot be removed, or a connecting plate that is connected to the connecting end 11 of the frame 1 by fasteners, riveting, snap-fitting, or other means.

[0051] The support plate 21 is threadedly connected to the connecting end 11 of the frame 1, and the two are detachable, facilitating the assembly of the fuel cell stack 5. Furthermore, the threaded connection between the support plate 21 and the connecting end 11 of the frame 1 simplifies the installation process. During installation, simply rotating the support plate 21 relative to the frame 1 allows for installation via the threaded engagement, adjusting the distance between the two end plates 2 so that the end plates 2 can clamp the fuel cell stack 5 within the receiving cavity. Figure 1 In the illustrated embodiment, the frame 1 has a cylindrical structure with a circular radial cross-section. In this case, the first direction is the axial direction of the frame 1. Setting the frame 1 as a cylindrical structure facilitates the provision of a threaded portion at the connecting end 11 for threaded engagement with the support plate 21. Of course, in this embodiment, the structure of the frame 1 is not limited; for example, the cross-section can also be square, polygonal, or other regular or irregular structures.

[0052] In this embodiment, there is no limitation on the connection method between the support plate 21 and the connecting end 11. For example, the support plate 21 and the connecting end 11 can be connected by a snap-fit. The support plate 21 is provided with a first snap-fit ​​structure, and the connecting end 11 is provided with a plurality of second snap-fit ​​structures along the first direction. The support plate 21 can be connected to the connecting end 11 by snap-fitting the first snap-fit ​​structure with a second snap-fit ​​structure. In the first snap-fit ​​structure and the second snap-fit ​​structure, one is a snap-fit ​​protrusion and the other is a snap-fit ​​hole or a snap-fit ​​groove.

[0053] The support plate 21 and the connecting end 11 are connected by threads, which simplifies the overall structure and improves the stability in the connected state. It also allows for stepless adjustment of the distance between the two end plates 2, thereby reducing process requirements.

[0054] The support plate 21 forms an inner wall surface 22 on one side of the receiving cavity. This inner wall surface 22 is provided with an annular protrusion 23, which is threadedly connected to the connecting end 11. This can be as follows: Figure 2 As shown, the annular protrusion 23 is provided with external threads, and the connecting end 11 of the frame 1 is provided with internal threads. Alternatively, the annular protrusion 23 can be provided with internal threads and the connecting end 11 can be provided with external threads.

[0055] Of course, in this embodiment, the support plate 21 can also be set as a plate with a certain thickness, and external threads can be provided on the peripheral sidewall of the support plate 21 for threaded connection with the connecting end 11 of the frame 1. The setting of the annular protrusion 23 can simplify the structure of the support plate 21 and reduce the material used in the support plate 21, which is conducive to achieving overall structural lightweighting and cost reduction.

[0056] The frame 1 is provided with a first limiting part 13, and the support plate 21 is provided with a second limiting part 24. In the installed state, the support plate 21 is threadedly engaged with the connecting end 11, and the first limiting part 13 and the second limiting part 24 abut against each other. During installation, as the support plate 21 rotates relative to the frame 1, the support plate 21 moves along the first direction until the first limiting part 13 and the second limiting part 24 abut against each other, at which point the support plate 21 is installed in place. The installation is limited by the abutment of the first limiting part 13 and the second limiting part 24, which can provide prompts to the operator and facilitate the installation operation.

[0057] There are no restrictions on the first limiting part 13 and the second limiting part 24. For example, the first limiting part 13 can be formed by the end face of the connecting end 11 of the frame 1, and the second limiting part 24 can be formed by a local area of ​​the inner wall surface 22 of the support plate 21. Alternatively, the first limiting part 13 can be set radially inward or outward through the connecting end 11, and the second limiting part 24 can be set correspondingly on the support plate 21.

[0058] like Figure 2As shown, the portion of the inner wall surface 22 of the support plate 21 located on the outer periphery of the annular protrusion 23 can form the aforementioned second limiting portion 24.

[0059] like Figure 3 As shown, the side wall of the support plate 21 away from the receiving cavity forms an outer wall surface 25. The outer wall surface 25 is also provided with a rotating engagement structure 26. The rotating engagement structure 26 is used to cooperate with the installation tool 6. After the installation tool 6 cooperates with the rotating engagement structure 26, the support plate 21 can be rotated synchronously by rotating the installation tool 6, thereby realizing the installation and disassembly operation of the support plate 21.

[0060] Of course, the support plate 21 can also be rotated directly by turning the wrench. The rotational mating structure 26, which is rotated with the installation tool 6, can be used for situations where the support plate 21 is relatively thin and has a large area, thereby reducing the structural requirements of the support plate 21 and facilitating disassembly and assembly.

[0061] like Figure 3 , Figure 4 and Figure 5 As shown, the outer wall surface 25 of the support plate 21 is provided with multiple rotating fit structures 26 at intervals along the circumference. For example, the rotating fit structure 26 can be a fitting groove, and the installation tool 6 is provided with multiple fitting protrusions 61. During installation, the fitting protrusions 61 of the installation tool 6 are installed into the fitting groove. The fitting protrusions 61 and the fitting groove can have a clearance fit for easy operation. The installation tool 6 can be provided with an internal hexagon head or an external hexagon head, etc. An external drive component drives the installation tool 6 to rotate. The installation tool 6 can evenly transmit tangential torque to the support plate 21 through the fitting protrusions 61 and the fitting groove, thereby driving the support plate 21 to rotate. Alternatively, the rotating fit structure 26 can also be a fitting protrusion 61, and the installation tool 6 can be provided with multiple fitting grooves.

[0062] Of course, in this embodiment, there are no restrictions on the number or position of the rotary mating structure 26. For example, it can also be set as an internal hexagonal hole, square hole, square protrusion, etc., located on the outer wall surface 25 of the support plate 21 and coaxial with the support plate 21. When it is set as multiple mating grooves arranged in the circumferential direction, it can improve the uniformity of the force between the installation tool 6 and the support plate 21, reduce the probability of deformation of the support plate 21, and make the threaded fit between the support plate 21 and the frame 1 more stable and smooth.

[0063] like Figure 3 , Figure 4 and Figure 5 As shown, the outer wall surface 25 of the support plate 21 is also provided with a positioning groove 27. The rotating mating structure 26 is a mating groove that communicates with the positioning groove 27. The positioning groove 27 can be used to position the installation tool 6, so that the mating protrusion 61 can quickly mate with the mating groove and improve the installation efficiency.

[0064] End plate 2 can be an insulating plate that does not have an electrical connection with fuel cell stack 5.

[0065] Or, it could be like this Figure 6 As shown, the end plate 2 includes a metal plate 28 and an insulating plate 29. The metal plate 28 is threaded to the connecting end 11 of the frame 1 to improve the structural strength and thus improve the stability of clamping the fuel cell stack 5 in the installation state. The insulating plate 29 is located on the side of the metal plate 28 facing the receiving cavity and plays the role of electrical insulation between the metal plate 28 and the fuel cell stack 5.

[0066] At least one end plate 2 is provided with an elastic part 3 on the side facing the receiving cavity. The elastic part 3 includes an elastic element 31 and a pressure plate 32. The elastic element 31 is sandwiched between the pressure plate 32 and the end plate 2.

[0067] It can be like Figure 6 As shown, the two end plates 2 are respectively provided with elastic parts 3 on the side facing the receiving cavity. Alternatively, the end plate 2 can be provided with elastic parts 3 on the side facing the receiving cavity. In this case, the end plate 2 can be a support plate 21, a connecting plate, or a fixing plate.

[0068] The elastic element 31 can extend and retract along the first direction between the end plate 2 and the pressure plate 32, and provide elasticity to the pressure plate 32, so that the pressure plate 32 elastically abuts against the battery stack 5. In practical applications, the volume of a single battery 52 in the battery stack 5 may change due to expansion or other reasons. By pressing the elastic element 31 by the pressure plate 32, the battery stack 5 can be provided with a matching space, and the clamping effect on the battery stack 5 can be improved, which is flexible.

[0069] The pressure plate 32 contacts the fuel cell stack 5, increasing the contact area and improving stability. The structure of the pressure plate 32 is not limited; it can be made of corrosion-resistant materials such as titanium or stainless steel.

[0070] like Figure 7 and Figure 9 As shown, the pressure plate 32 is also provided with a positioning boss 323, and the end plate 2 is an annular structure with a central hole 211. During installation, the positioning boss 323 of the pressure plate 32 can pass through the elastic member 21 and be inserted into the central hole 211 to achieve positioning and engagement with the central hole 211. Through the positioning and engagement of the positioning boss 323 and the central hole 211, the installation efficiency can be improved and the installation stability of the pressure plate 32 can be enhanced, so that the squeezing action of the pressure plate 32 on the fuel cell stack 5 is stable.

[0071] There are no restrictions on the structure of the elastic element 31, such as... Figure 6 and Figure 7In the embodiment shown, the elastic element 31 is a disc spring, and the inner wall surface 22 of the end plate 2 is provided with a first annular groove 210. When the end plate 2 includes a metal plate 28 and an insulating plate 29, such as Figure 8 As shown, the insulating plate 29 is provided with a first annular groove 210, such as Figure 9 As shown, the pressure plate 32 has a second annular groove 321 on one side wall facing the end plate 2. One end of the disc spring abuts against the bottom wall of the first annular groove 210, and the other end of the disc spring abuts against the bottom wall of the second annular groove 321. By setting the first annular groove 210 and the second annular groove 321, the disc spring can be limited, improving the installation stability, thereby improving the stability of the pressure plate 32 and preventing the pressure plate 32 from tilting due to the movement of the disc spring.

[0072] Of course, the elastic element 31 can also be a helical spring. The helical spring can be a single helical spring coaxial with the end cover, or multiple helical springs evenly spaced along the circumference.

[0073] like Figure 7 As shown, a wear-resistant ring 4 is also provided in the first annular groove 210. The wear-resistant ring 4 contacts the end of the disc spring, reducing friction on the end plate 2 and extending the service life of the end plate 2. Of course, a wear-resistant ring 4 can also be provided in the second annular groove 321, and no specific restriction is made here.

[0074] like Figure 10 As shown, the side wall of frame 1 is also provided with weight reduction holes 14, which are conducive to achieving structural lightweighting. There are no restrictions on the shape, number and arrangement of the weight reduction holes 14.

[0075] Frame 1 can be an insulating frame that does not have an electrical connection with fuel cell 5.

[0076] Alternatively, frame 1 can also be a metal frame to improve its structural strength and overall installation stability. In this case, such as... Figure 10 As shown, the inner wall 16 is formed on one side of the frame 1 facing the cavity. The inner wall 16 protrudes to one side of the cavity and is provided with an insulating member 15. The insulating member 15 provides electrical insulation between the metal frame and the fuel cell 5.

[0077] When frame 1 is a metal frame, such as Figure 10As shown, at least two insulating members 15 are provided circumferentially at intervals on the inner sidewall 16 of the frame 1. The insulating members 15 protrude inward from the inner sidewall 16 of the frame 1 and extend in a first direction. The insulating members 15 are used to cooperate with the fuel cell stack 5. In the installed state, the peripheral sidewall of the fuel cell stack 5 cooperates with each insulating member 15 respectively, so that a gap is formed between the outer wall surface 25 of the fuel cell stack 5 and the inner sidewall 16 of the frame 1. The outer wall surface 25 of the fuel cell stack 5 does not directly contact the inner sidewall 16 of the frame 1, thereby isolating the electrical connection between the two.

[0078] Of course, in this embodiment, the structure of the insulating component 15 is not limited. For example, an insulating layer can also be attached to the inner sidewall 16 of the frame 1. When at least two insulating components 15 are arranged at intervals along the circumference of the frame 1 to achieve electrical insulation between the fuel cell stack 5 and the frame 1, the overall structure can be simplified and the cost can be reduced.

[0079] And, as Figure 10 and Figure 11 As shown, the outer wall surface 25 of the fuel cell stack 5 can also be provided with a first mating groove 53 that is adapted to the insulating component 15. During installation, the first mating groove 53 of the fuel cell stack 5 corresponds to and mates with the insulating component 15, and can also provide guidance for the installation of the fuel cell stack 5, making the installation operation convenient.

[0080] When the outer wall surface 25 of the fuel cell stack 5 is provided with a first mating groove 53 that is adapted to the insulating component 15, two insulating components 15 can be provided on the inner side wall 16 of the frame 1 in the circumferential direction, which can satisfy the requirement that a gap is formed between the fuel cell stack 5 and the frame 1. If the outer wall surface 25 of the fuel cell stack 5 is not provided with a first mating groove 53, three or more insulating components 15 can be provided on the inner side wall 16 of the frame 1 in the circumferential direction. Each insulating component 15 can provide a limit to the fuel cell stack 5 from different sides in the circumferential direction, so that a gap is formed between the outer wall surface 25 of the fuel cell stack 5 and the inner side wall 16 of the frame 1.

[0081] like Figure 10 As shown, the inner wall 16 of the frame 1 is provided with a protruding rib 151, which extends along a first direction. The outer wall surface 25 of the protruding rib 151 is covered with an insulating layer 152 to form the aforementioned insulating component 15. Of course, the insulating component 15 can also be an insulating strip provided on the inner wall 16 of the frame 1. The provision of the protruding rib 151 can reduce the thickness requirement of the insulating component 15, and can also increase the circumferential support stability of the insulating component 15 for the fuel cell stack 5. Furthermore, when the fuel cell stack 5 is provided with a first mating groove 53, it can also improve the stability of the guiding effect on the installation of the fuel cell stack 5.

[0082] The protruding rib 151 and the frame 1 can be an integrally formed structure or fixed by fasteners, snap-fit, or other methods. The insulating layer 152 and the protruding rib 151 can be connected by adhesive, riveting, or other methods, and no specific restrictions are imposed here.

[0083] When the pressure plate 32 is a conductive plate such as a metal pressure plate, the pressure plate 32 also forms a gap with the inner sidewall 16 of the frame 1 through the setting of the insulating component 15. The pressure plate 32 may be provided with a second mating groove 322, which mates with the insulating component 15.

[0084] This application embodiment also provides an electrolytic cell, which includes an electrode stack 5 and an electrode stack clamping device as described above, wherein the electrode stack 5 is installed in the frame 1 of the electrode stack clamping device and clamped by two end plates 2.

[0085] like Figure 11 and Figure 12 As shown, the fuel cell stack 5 includes two current collectors 51 and multiple single-cell batteries 52 located between the two current collectors 51. Each single-cell battery 52 includes a bipolar plate 521, a gas diffusion layer 522, a proton exchange membrane 523, a catalyst 524, etc. The structure of the fuel cell stack 5 is the same as that of a conventional fuel cell stack 5, and will not be described in detail here for the sake of brevity.

[0086] This application also provides a hydrogen fuel cell, which includes the electrolyzer described above.

[0087] The electrolyzer with the above-mentioned stack clamping device and the hydrogen fuel cell with the above-mentioned electrolyzer have similar technical effects to the above-mentioned stack clamping device, and will not be described in detail here for the sake of saving space.

[0088] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0090] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A fuel cell stack clamping device, characterized in that, Includes a frame (1) and two end plates (2); The frame (1) forms connecting ends (11) at both ends along the first direction. Two end plates (2) are respectively provided at the two connecting ends (11) and surround the frame (1) to form a receiving cavity for accommodating the fuel cell stack (5). The side wall of the frame (1) is provided with a wire outlet hole (12), which is used for the current collector wire outlet end (511) of the fuel cell stack (5) to pass through. The spacing between the two end plates (2) is adjustable.

2. The fuel cell stack clamping device according to claim 1, characterized in that, At least one of the end plates (2) is a support plate (21), and the support plate (21) is threadedly connected to the connecting end (11).

3. The fuel cell stack clamping device according to claim 2, characterized in that, The support plate (21) forms an inner wall (22) on one side of the cavity, and the inner wall (22) is provided with an annular protrusion (23), which is threadedly connected to the connecting end (11).

4. The fuel cell stack clamping device according to claim 2, characterized in that, The connecting end (11) is provided with a first limiting part (13), and the support plate (21) is provided with a second limiting part (24). The support plate (21) is threadedly connected to the connecting end (11), and the first limiting part (13) and the second limiting part (24) abut against each other.

5. The fuel cell stack clamping device according to any one of claims 2-4, characterized in that, The side wall of the support plate (21) away from the receiving cavity forms an outer wall surface (25), and the outer wall surface (25) is also provided with a rotational fitting structure (26), which is used to cooperate with the installation tool (6) and rotate synchronously.

6. The fuel cell stack clamping device according to claim 5, characterized in that, The outer wall surface (25) is provided with a plurality of the rotary mating structures (26) at intervals along the circumference.

7. The fuel cell stack clamping device according to any one of claims 1-4, characterized in that, The end plate (2) is an insulating plate; Alternatively, the end plate (2) may include a metal plate (28) and an insulating plate (29), the insulating plate (29) being disposed on the side of the metal plate (28) facing the receiving cavity.

8. The fuel cell stack clamping device according to any one of claims 1-4, characterized in that, At least one of the end plates (2) is provided with an elastic element (31) and a pressure plate (32) on the side facing the receiving cavity, the elastic element (31) being sandwiched between the pressure plate (32) and the end plate (2).

9. The fuel cell stack clamping device according to claim 8, characterized in that, The elastic element (31) is a disc spring. The end plate (2) is provided with a first annular groove (210), and the pressure plate (32) is provided with a second annular groove (321). One end of the disc spring abuts against the bottom wall of the first annular groove (210), and the other end of the disc spring abuts against the bottom wall of the second annular groove (321).

10. The fuel cell stack clamping device according to claim 8, characterized in that, The pressure plate (32) is also provided with a positioning boss (323), and the end plate (2) is an annular structure with a central hole (211). The positioning boss (323) passes through the elastic member (31) and is positioned and engaged with the central hole (211).

11. The fuel cell stack clamping device according to any one of claims 1-4, characterized in that, The sidewall of the frame (1) is also provided with weight reduction holes (14).

12. The fuel cell stack clamping device according to any one of claims 1-4, characterized in that, The frame (1) is an insulating frame; Alternatively, the frame (1) may be a metal frame, and the inner wall of the frame (1) may also be provided with an insulating component (15).

13. The fuel cell stack clamping device according to claim 12, characterized in that, The frame (1) forms an inner sidewall (16) facing one side of the receiving cavity. The inner sidewall (16) protrudes to one side of the receiving cavity and is provided with at least two insulating members (15). Each insulating member (15) is spaced apart and extends along the first direction. The insulating member (15) is used to cooperate with the fuel cell stack (5) so that a gap is formed between the outer wall surface (25) of the fuel cell stack (5) and the inner sidewall (16).

14. The fuel cell stack clamping device according to claim 13, characterized in that, The inner sidewall (16) is provided with a protruding ridge (151), the protruding ridge (151) extends along the first direction, and the outer wall surface (25) of the protruding ridge (151) is covered with an insulating layer (152) to form the insulating component (15).

15. An electrolytic cell, characterized in that, It includes a fuel cell stack (5) and a fuel cell stack clamping device as described in any one of claims 1-14.

16. A hydrogen fuel cell, characterized in that, Includes the electrolytic cell as described in claim 15.

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