Fuel cell stack and method of assembling same

Abstract

The present application provides a fuel cell stack comprising: a first fuel cell unit comprising: a first electrode plate; a second electrode plate stacked on the first electrode plate; the membrane electrode assembly is clamped between the first polar plate and the second polar plate; wherein a first sealing strip is arranged below the edge part of the second polar plate and is in contact with the sealing gasket of the membrane electrode assembly, and a second sealing strip is arranged above the edge part of the second polar plate and is configured to be in elastic contact with the bottom surface of the edge part of the first polar plate of the second fuel cell unit. The invention also provides an assembling method of the fuel cell stack. According to the invention, laser welding is not needed any more, the design of the port area of the polar plate is simplified, and the assembly of the fuel cell stack is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and particularly to a fuel cell stack and an assembly method thereof. Background Art

[0002] With the development of new energy technologies, fuel cell stacks, as a clean energy source, are increasingly attracting the attention of researchers and the market, and have been widely used in fields such as electric vehicles and portable power sources. A fuel cell stack generally includes a plurality of fuel cell units stacked together. Except for the fuel cell units at the ends, each fuel cell unit includes two bipolar plates shared with adjacent fuel cell units and a membrane electrode assembly sandwiched between the two bipolar plates.

[0003] Existing bipolar plates are generally formed by laser-welding two metal plates together to form a sealed coolant channel therebetween, and a first gas (such as hydrogen) channel and a second gas (such as oxygen or air) channel are respectively formed on opposite sides of the two metal plates. To avoid an increase in contact resistance due to corrosion and the entry of ions into the catalytic layer resulting in a decline in battery performance, the gas side of the bipolar plate needs to be coated. However, due to the presence of laser weld spots, problems such as corrosion may occur due to poor adhesion of the coating around the weld spots. In addition, due to the thermal influence of laser welding, the stress inside the metal plate may be uneven, leading to deformation, and defects such as burn-through, cracks, and weld beads are also likely to occur.

[0004] For fuel cell stacks, reliable sealing is crucial for safety and effectiveness. The main sealing method in the prior art is rubber sealing. During large-scale production, rubber sealing strips are usually formed by injection molding at the edge part and port area (ports for inputting and discharging various gases such as hydrogen, oxygen, and coolant) of the bipolar plate to cooperate with the sealing gaskets of the membrane electrode assembly. Since the port area usually adopts a "zigzag" structure, the structure of the sealing strip is complex, so the port area is a high-risk area for injection molding. Therefore, during the injection molding process of the sealing strip, materials must be strictly selected, and injection pressure and curing temperature must be strictly set, otherwise effective sealing may not be achieved. In addition, considering manufacturing and assembly tolerances, the sealing strip usually has a relatively thick thickness, but this will result in a reduction in contact pressure, bringing safety risks, and it is also easy to cause material waste. Moreover, for injection molds with complex port area designs, the manufacturing cost is also relatively high. In addition, the sealing gasket formed by injection molding at the outer edge of the membrane electrode assembly is relatively soft, and the sealing gasket itself cannot provide sufficient rigidity, so it is not conducive to the assembly of the fuel cell stack.

[0005] Therefore, it is necessary to improve the existing structure of fuel cell stacks and their assembly methods. Summary of the Invention

[0006] The object of the present application is to provide an improved fuel cell stack and an assembly method thereof, so as to overcome at least one technical problem existing in the prior art.

[0007] To this end, according to one aspect of the present application, there is provided a fuel cell stack, comprising: a first fuel cell unit, which includes: a first plate, which has a first plate central portion and a first plate edge portion provided around the first plate central portion; a second plate, which has a second plate central portion and a second plate edge portion provided around the second plate central portion, and the second plate is stacked on the first plate; a membrane electrode assembly, which has a membrane electrode body and a gasket provided around the membrane electrode body, and the membrane electrode assembly is clamped between the first plate and the second plate; wherein, a first sealing strip is provided below the second plate edge portion, the first sealing strip is in contact with the gasket, and a second sealing strip is provided above the second plate edge portion, and the fuel cell stack further includes a second fuel cell unit having the same structure as the first fuel cell unit, and the second sealing strip is configured to be elastically in contact with the bottom surface of the first plate edge portion of the first plate of the second fuel cell unit.

[0008] According to another aspect of the present application, there is also provided an assembly method of a fuel cell stack, comprising the following steps: a step of assembling a single fuel cell unit, which includes: providing a first plate; fixing the membrane electrode assembly on the first plate; arranging a first sealing strip below the second plate edge portion of the second plate; arranging the second plate provided with the first sealing strip on the membrane electrode assembly; and arranging a second sealing strip above the second plate edge portion of the second plate, and the second sealing strip is configured to be elastically in contact with the bottom surface of the first plate edge portion of another fuel cell unit.

[0009] The fuel cell stack and the assembly method thereof of the present application no longer require laser welding to form a bipolar plate, because the sealing of the coolant can be achieved by an elastic sealing strip. Since there are no laser welding points, a fully covered coating can be formed on the plate, and welding defects can be avoided. Description of the Drawings

[0010] Hereinafter, exemplary embodiments of the present application will be described in detail with reference to the drawings. It should be understood that the embodiments described below are only for explaining the present application, rather than limiting the scope of the present application. In the drawings:

[0011] Figure 1 is a schematic partial cross-sectional view of a fuel cell stack according to an embodiment of the present application;

[0012] Figure 2Yes Figure 1 A schematic partial cross-sectional view of a fuel cell unit in the fuel cell stack shown;

[0013] Figure 3 Yes Figure 2 A schematic plan view of a first plate of the fuel cell unit shown in;

[0014] Figure 4 Yes Figure 2 A schematic plan view of a second plate of the fuel cell unit shown in;

[0015] Figure 5 Yes Figure 2 A schematic partial cross-sectional view of the first plate of the fuel cell unit shown in and the membrane electrode assembly adhered to the first plate;

[0016] Figure 6 Yes Figure 2 A schematic partial cross-sectional view of the second plate of the fuel cell unit shown in and the sealing strips mounted above and below the second plate;

[0017] Figure 7 Is a schematic partial cross-sectional view taken along Figure 3 Line II-II' in;

[0018] Figure 8 Is a schematic partial cross-sectional view taken along Figure 3 Line III-III' in;

[0019] Figure 9 Is a schematic partial cross-sectional view taken along Figure 3 Line IV-IV' in;

[0020] Figure 10 Is a schematic flow chart of an assembly method of a fuel cell stack according to an embodiment of the present application. Detailed Description of the Preferred Embodiments

[0021] The preferred embodiments of the present application will be described in detail below with reference to examples. Those skilled in the art should understand that these exemplary embodiments do not impose any limitation on the present application. In addition, the features in the embodiments of the present application can be combined with each other without conflict. In different drawings, the same components are denoted by the same reference numerals, and for the sake of brevity, other components are omitted, but this does not mean that the fuel cell stack of the present application cannot include other components, nor does it mean that the assembly method of the present application cannot include other steps. It should be understood that the dimensions, proportional relationships, number of components, and step sequences of the methods in the drawings do not impose any limitation on the present application.

[0022] In the following description of the embodiments of the present application, terms such as "upper", "lower", "top", "bottom" are used to express relative orientation or positional relationships. It should be understood that the orientation or positional relationships expressed by these terms are based on the orientation or positional relationships shown in the relevant drawings, rather than restricting that the components or members referred to must be arranged in a specific orientation. Therefore, the above terms should not be construed as a limitation to the present application.

[0023] The following will refer to Figures 1 to 6 to describe the composition and structure of a fuel cell stack and the fuel cell units included therein according to an embodiment of the present application.

[0024] As Figure 1 shown, the fuel cell stack 200 may include a first fuel cell unit 100 and a second fuel cell unit 100'. The structure of the first fuel cell unit 100 is the same as that of the second fuel cell unit 100'. The second fuel cell unit 100' is stacked on the first fuel cell unit 100. It should be noted that the two fuel cell units shown are only examples. The fuel cell stack 200 of the present application is not limited thereto, but may include more fuel cell units with the same structure. Therefore, when describing the components of the first fuel cell unit 100, it can be understood that the corresponding components of the second fuel cell unit 100' are also described. Additionally, it should be understood that although not shown in Figure 1 , Figure 1 the fuel cell stack 200 shown in

[0025] As Figure 2 shown, the first fuel cell unit 100 may include a first electrode plate 10, a second electrode plate 20, and a membrane electrode assembly 30. The first electrode plate 10 may have a first electrode plate central portion 12 and a first electrode plate edge portion 11 disposed around the first electrode plate central portion 12. The second electrode plate 20 may have a second electrode plate central portion 22 and a second electrode plate edge portion 21 disposed around the second electrode plate central portion 22. The second electrode plate 20 is stacked on the first electrode plate 10. One of the first electrode plate 10 and the second electrode plate 20 may be an anode plate, and the other of the first electrode plate 10 and the second electrode plate 20 may be a cathode plate. The first electrode plate 10 and the second electrode plate 20 are generally made of a metal material (e.g., aluminum, nickel, titanium, stainless steel) or a composite conductive material.

[0026] As Figure 3 and Figure 4As shown, at one end of either the first electrode plate 10 or the second electrode plate 20, there are provided a first gas inlet 51, a second gas inlet 61, and a coolant inlet 71, and at the other end, there are provided a first gas outlet 52, a second gas outlet 62, and a coolant outlet 72. Among them, the first gas inlet 51 and the second gas inlet 61 are respectively arranged on both sides of the coolant inlet 71, and the first gas outlet 52 and the second gas outlet 62 are also respectively arranged on both sides of the coolant outlet 72. However, the present application is not limited to the above arrangements of each port, and the positions and layouts of the above inlets and outlets can be arbitrarily swapped as needed. For example, the second gas inlet 61 and the first gas outlet 52 are located at the same end, and the coolant inlet 71 and the coolant outlet 72 are arranged on both sides of the first electrode plate 10 and the second electrode plate 20, rather than at both ends. Therefore, considering the swapping between the inlets and outlets, the first gas inlet 51 and the first gas outlet 52 can be collectively referred to as the first gas ports, the second gas inlet 61 and the second gas outlet 62 can be collectively referred to as the second gas ports, and the coolant inlet 71 and the coolant outlet 72 can be collectively referred to as the coolant ports.

[0027] As Figure 3 shown, a channel extending from one end to the other end is formed between the two ends of the first electrode plate edge portion 11 of the first electrode plate 10, and the channel on the inner surface (i.e., Figure 1 the surface seen in Figure 4 it) of the first electrode plate 10 is used for the first gas from the first gas inlet 51 to flow through and reach the first gas outlet 52. Similar to the structure of the first electrode plate 10, as Figure 2 shown, a channel extending from one end to the other end is formed between the two ends of the second electrode plate 20, and the channel on the inner surface (i.e., Figure 1 the surface seen in Figure 2 it) of the second electrode plate 20 is used for the second gas from the second gas inlet 61 to flow through and reach the second gas outlet 12. When the first electrode plate 10 and the second electrode plate 20 are stacked together, the channel on the outer surface (i.e., Figure 1 the back of the surface seen in Figure 3 it) of the first electrode plate 10 and the channel on the outer surface (i.e.,

[0028] The membrane electrode assembly 30 may have a membrane electrode body 31 and a gasket 32 disposed around the membrane electrode body 31, and the membrane electrode assembly 30 is clamped between the first plate 10 and the second plate 20. The membrane electrode body 31 may include a proton exchange membrane and a catalyst layer and a gas diffusion layer (not labeled) sequentially disposed on both sides of the proton exchange membrane. Since the membrane electrode assembly 30 is a common component in the field of fuel cell technology and this application does not improve the membrane electrode body, the membrane electrode body will not be described in more detail herein.

[0029] According to an embodiment of the present application, a first sealing strip 41 is provided below the edge portion 21 of the second plate, the first sealing strip 41 contacts the gasket 37, and a second sealing strip 42 is provided above the edge portion 21 of the second plate, and the second sealing strip 42 is configured to elastically contact the bottom surface of the first plate edge portion 11 of the first plate 10 of the second fuel cell unit 100'. In this way, the adjacent plates of two adjacent fuel cell units can be manufactured separately, and a coolant channel can be formed by the sealing strips, and it is no longer necessary to laser-weld the adjacent plates (corresponding to bipolar plates), thereby avoiding defects such as poor coating adhesion, deformation, and burn-through.

[0030] The first sealing strip 41 and the second sealing strip 42 can be formed by injection molding or cutting and pasting to dispose an elastic sealing material on the upper and lower sides of the second plate edge portion 21 of the second plate 20. The elastic sealing material used for the first sealing strip 41 and the second sealing strip 42 can be fluororubber (FPM), silicone rubber or nitrile rubber (NBR), polyurethane (PUR), natural rubber (NR), perfluoroelastomer (FFKM), styrene-butadiene rubber (SBR), butyl rubber (BR), fluorosilicone rubber (FVSQ), chlorosulfonated polyethylene (CSM), silicone resin, epoxy resin or a mixture of the above.

[0031] As Figure 5 shown, the top surface of the first plate center portion 12 may define a first plate center plane P1, and the top surface of the first plate edge portion 11 may define a first plate edge plane P2. In an existing fuel cell unit, the first plate center plane P1 and the first plate edge plane P2 are usually on the same reference plane. However, this structure limits the material selection and design freedom of the sealing strip disposed between the plate and the gasket 32 of the membrane electrode assembly 30, and the thickness of the sealing strip is large, affecting the contact pressure and wasting materials.

[0032] According to an embodiment of the present application, since the first plate 10 and the second plate 20 are not welded together, the first plate center plane P1 and the first plate edge plane P2 may not be on the same reference plane. For example, they may be parallel to each other and separated by a first predetermined interval d1, as Figure 5As shown. By adjusting the first predetermined interval d1, the first sealing strip 41 and the second sealing strip 42 with different heights can be realized, thereby increasing the freedom of the sealing design. For example, more types and sizes of sealing materials can be selected.

[0033] Similarly, as Figure 6 shown, the bottom surface of the central portion 22 of the second plate can define the second plate central plane P3, and the bottom surface of the edge portion 21 of the second plate can define the second plate edge plane P4. In existing fuel cell units, the second plate central plane P3 and the second plate edge plane P4 are usually also on the same reference plane, so they also have the above-mentioned disadvantages. According to the embodiments of the present application, the second plate central plane P3 and the second plate edge plane P4 may not be on the same reference plane. For example, they may be parallel to each other and separated by a second predetermined interval d2, as Figure 6 shown. By adjusting the second predetermined interval d2, the freedom of the sealing design can also be increased. In addition, by adjusting the first predetermined interval d1 and the second predetermined interval d2, the material thickness, stiffness, etc. of different parts of the first plate 10 and the second plate 20 can also be adjusted to meet the requirements of different positions.

[0034] In addition, in the above embodiments, the first sealing strip 41 and the second sealing strip 42 are separated by the second plate 20, so the thickness of each sealing strip becomes smaller, thereby achieving a greater contact pressure and correspondingly saving materials. To maintain the pressure balance on both sides during the injection molding process, avoid degumming and improve the sealing stability, the edge portion 21 of the second plate may be provided with connecting through holes 23, and the first sealing strip 41 and the second sealing strip 42 may pass through the connecting through holes 23 to become one body, as Figure 6 shown.

[0035] As Figure 1 、 Figure 2 and Figure 5 shown, the gasket 32 of the membrane electrode assembly 30 is bonded to the first plate edge portion 21 of the first plate 10 through the adhesive layer 43. Since the membrane electrode assembly 30 and the first plate 10 are bonded together, the problem that the gasket 32 is too soft and not conducive to assembly can be solved, thereby achieving rapid assembly. In addition, by adjusting the first predetermined interval d1 and the second predetermined interval d2, the design freedom of the adhesive layer 43 can also be increased. Therefore, the thicknesses of the first sealing strip 41, the second sealing strip 42, and the adhesive layer 43 can be associated with the first predetermined interval d1 and the second predetermined interval d2.

[0036] As analyzed above, in traditional designs, the port area usually adopts a zigzag structure and forms various channels to guide gas or coolant, but the risk is relatively high during injection molding. For this reason, the present application proposes a new port design.

[0037] As Figure 7 shown, a first gas through-hole 53 may be provided in the adhesive layer 53 between the gasket 32 of the membrane electrode assembly 30 and the edge portion 11 of the first plate. At one end of the first plate 10, a first gas inlet 51 may communicate with the first gas through-hole 53, so that the first gas can enter the side of the central portion 12 of the first plate facing the membrane electrode assembly 30 through the first gas inlet 51 and the first gas through-hole 53. Similarly, at the other end of the first plate 10, a first gas outlet 52 may communicate with the first gas through-hole 53, so that the first gas can be discharged from the side of the central portion 12 of the first plate facing the membrane electrode assembly 30 through the first gas through-hole 53 and the first gas outlet 52. Therefore, through the ports formed on the first plate 10 and the through-holes formed in the adhesive layer 43, the first gas can enter and exit the reaction zone without the need for complex structural design of the port regions of the first plate 10 and the second plate 20.

[0038] As Figure 8 shown, a second gas through-hole 63 may be provided in the first sealing strip 41 between the edge portion 21 of the second plate and the gasket 32. At one end of the second plate 20, a second gas inlet 61 may communicate with the second gas through-hole 63, so that the second gas can enter the side of the central portion 22 of the second plate facing the membrane electrode assembly 30 through the second gas inlet 61 and the second gas through-hole 63. Similarly, at the other end of the second plate 20, a second gas outlet 62 may communicate with the second gas through-hole 63, so that the second gas can be discharged from the side of the central portion 22 of the second plate facing the membrane electrode assembly 30 through the second gas through-hole 63 and the second gas outlet 62. Therefore, through the ports formed on the second plate 20 and the through-holes formed in the first sealing strip 41, the second gas can enter and exit the reaction zone without the need for complex structural design of the port regions of the first plate 10 and the second plate 20.

[0039] As Figure 9As shown, a second sealing strip 42 located above the edge portion 21 of the second electrode plate may be provided with coolant through holes 73. At one end of the first electrode plate 10 and the second electrode plate 20, a coolant inlet 71 may communicate with the coolant through holes 73, such that coolant can enter the side of the central portion 22 of the second electrode plate facing away from the membrane electrode assembly 30 through the coolant inlet 71 and the coolant through holes 73. Similarly, at the other end of the first electrode plate 10 and the second electrode plate 20, a coolant outlet 72 may communicate with the coolant through holes 73, such that coolant can be discharged from the side of the central portion 22 of the second electrode plate facing away from the membrane electrode assembly 30 through the coolant through holes 73 and the coolant outlet 72. Therefore, through the ports formed on the first electrode plate 10 and the second electrode plate 20 and the through holes formed in the second sealing strip 42, coolant can enter and be discharged from the coolant channels, without the need for complex structural design of the port regions of the first electrode plate 10 and the second electrode plate 20.

[0040] The following refers to Figure 10 Describe the method of assembling a fuel cell stack according to an embodiment of the present application. As Figure 10 shown, the method 300 of assembling the fuel cell stack 200 may include a step 310 of assembling a single fuel cell unit and a step 320 of assembling a plurality of fuel cell units 100.

[0041] The step 310 of assembling a single fuel cell unit includes: at step 311, providing a first electrode plate 10, where various ports and channels have been machined on the first electrode plate 10; at step 312, fixing the membrane electrode assembly 30 on the first electrode plate 10; at step 313, disposing a first sealing strip 41 below the edge portion 21 of the second electrode plate of the second electrode plate 20; at step 314, disposing the second electrode plate 20 provided with the first sealing strip 41 on the membrane electrode assembly 20; and at step 315, disposing a second sealing strip 42 above the edge portion 21 of the second electrode plate of the second electrode plate, the second sealing strip 42 being configured to elastically contact the bottom surface of the edge portion of the first electrode plate of another fuel cell unit (e.g., Figure 1 the second fuel cell unit described above). In this way, a single fuel cell unit can be assembled, and the second sealing strip of the assembled fuel cell unit can contact the first electrode plate of another stacked fuel cell unit, thereby defining a coolant channel through the adjacent electrode plates and the second sealing strip of adjacent fuel cell units.

[0042] Specifically, the step 312 of fixing the membrane electrode assembly 30 on the first electrode plate 10 may further include: bonding the gasket 37 of the membrane electrode assembly 30 to the edge portion 11 of the first electrode plate of the first electrode plate 10 through an adhesive layer 43, such that the membrane electrode assembly 30 remains fixed relative to the first electrode plate 10.

[0043] In addition, step 315 can be combined with step 313. For example, the first sealing strip 41 and the second sealing strip 42 are formed integrally by injection molding.

[0044] In step 320 of assembling a plurality of fuel cell units, the plurality of fuel cell units 100 assembled in step 310 of assembling a single fuel cell unit can be stacked on top of each other. In this way, a coolant channel can be formed between the first electrode plate of one of the adjacent fuel cell units and the second electrode plate of the other through the second sealing strip. Alternatively, step 310 of assembling a single fuel cell unit can also be continuously and repeatedly executed, that is, step 310 of assembling a single fuel cell unit is repeatedly executed on the second electrode plate of the already assembled single fuel cell unit, and so on until the assembly of the entire fuel cell stack is completed.

[0045] Based on the above-improved fuel cell stack and its assembly method, it is not necessary to form the bipolar plate of the fuel cell unit by laser welding because the coolant seal can be achieved by an elastic sealing strip. In addition, since there are no laser welding points, a fully covered coating can be formed on the side of the electrode plate used to form the coolant channel, and defects related to laser welding can be avoided. Additionally, the port area no longer needs to adopt a zigzag structure. Therefore, only the corresponding ports need to be machined on the electrode plate and the corresponding channels need to be machined in the sealing strip and the adhesive layer to achieve the input and output of various gases and coolants. So, the new port structure is more conducive to injection molding and allows for a wider selection of materials, processes, and designs. In addition, the edge part and the central part of the electrode plate can have different heights to improve the design freedom. Moreover, by connecting the membrane electrode assembly to a single electrode plate through an adhesive layer, the problem that a soft gasket is not conducive to assembly is solved.

[0046] The present application has been described in detail above in conjunction with specific embodiments. Obviously, the above description and the embodiments shown in the drawings should be understood as exemplary and do not constitute a limitation to the present application. For those skilled in the art, various variations or modifications can be made without departing from the spirit of the present application, and these variations or modifications do not depart from the scope of the present application.

Claims

1. A fuel cell stack (200), comprising: A first fuel cell unit (100), comprising: A first plate (10), having a first plate central portion (12) and a first plate edge portion (11) disposed around the first plate central portion (12); A second plate (20), having a second plate central portion (22) and a second plate edge portion (21) disposed around the second plate central portion (22), the second plate (20) being stacked on the first plate (10); A membrane electrode assembly (30), having a membrane electrode body (31) and a gasket (32) disposed around the membrane electrode body (31), the membrane electrode assembly (30) being clamped between the first plate (10) and the second plate (20); Wherein, a first sealing strip (41) is provided below the second plate edge portion (21), the first sealing strip (41) is in contact with the gasket (32), and a second sealing strip (42) is provided above the second plate edge portion (21), and The fuel cell stack (200) further includes a second fuel cell unit (100') having the same structure as the first fuel cell unit (100), and the second sealing strip (42) is configured to be in elastic contact with the bottom surface of the first plate edge portion (11) of the second fuel cell unit (100').

2. The fuel cell stack (200) according to claim 1, wherein, The top surface of the first plate central portion (12) defines a first plate central plane (P1), the top surface of the first plate edge portion (11) defines a first plate edge plane (P2), and the first plate central plane (P1) and the first plate edge plane (P2) are parallel to each other and spaced apart by a first predetermined interval (d1).

3. The fuel cell stack (200) according to claim 2, wherein, The bottom surface of the second plate central portion (22) defines a second plate central plane (P3), the bottom surface of the second plate edge portion (21) defines a second plate edge plane (P4), and the second plate central plane (P3) and the second plate edge plane (P4) are parallel to each other and spaced apart by a second predetermined interval (d2).

4. The fuel cell stack (200) according to claim 3, wherein, The thicknesses of the first sealing strip (41), the second sealing strip (42), and the adhesive layer (43) are associated with the first predetermined interval (d1) and the second predetermined interval (d2).

5. The fuel cell stack (200) according to any one of claims 1 to 4, wherein, The gasket (32) and the first plate edge portion (11) are bonded together through an adhesive layer (43).

6. The fuel cell stack (200) according to claim 5, wherein, The first plate (10) and the second plate (20) are provided with a first gas port, and a first gas through hole (53) is provided in the adhesive layer (53), and the first gas port is in communication with the first gas through hole (53), so that the first gas can enter and discharge from the side of the first plate central portion (12) facing the membrane electrode assembly (30) through the first gas port and the first gas through hole (53).

7. The fuel cell stack (200) according to claim 6, wherein, The first electrode plate (10) and the second electrode plate (20) are provided with a second gas port, and the first sealing strip (41) is provided with a second gas through hole (63). The second gas port is connected to the second gas through hole (63), so that the second gas can enter the side of the central part (22) of the second electrode plate facing the membrane electrode assembly (30) through the second gas port and the second gas through hole (63) and be discharged therefrom.

8. The fuel cell stack (200) according to claim 6 or 7, wherein, The first electrode plate (10) and the second electrode plate (20) are provided with a coolant inlet (71), and the second sealing strip (42) is provided with a coolant through hole (73), so that the coolant can enter the side of the central part (22) of the second electrode plate away from the membrane electrode assembly (30) through the coolant inlet (71) and the coolant through hole (73) and be discharged therefrom.

9. The fuel cell stack (200) according to claim 1, wherein, The second electrode plate edge portion (21) is provided with a connecting through hole (23), and the first sealing strip (41) and the second sealing strip (42) pass through the connecting through hole (23) to form a whole.

10. The fuel cell stack (200) according to claim 1, wherein, One of the first electrode plate (10) and the second electrode plate (20) is an anode plate, and the other of the first electrode plate (10) and the second electrode plate (20) is a cathode plate.

11. A method (300) for assembling a fuel cell stack (200), comprising the following steps: The step (310) of assembling a single fuel cell unit comprises: Providing a first electrode plate (10); Fixing the membrane electrode assembly (30) on the first electrode plate (10); Disposing a first sealing strip (41) below a second electrode plate edge portion (21) of a second electrode plate (20); The second electrode plate (20) provided with the first sealing strip (41) is arranged on the membrane electrode assembly (20); and A second sealing strip (42) is disposed above the second electrode plate edge portion (21) of the second electrode plate, and the second sealing strip (42) is configured to elastically contact the bottom surface of the first electrode plate edge portion (11) of the first electrode plate (10) of another fuel cell unit.

12. The assembling method (300) according to claim 11, wherein, The step of fixing the membrane electrode assembly (30) on the first electrode plate (10) comprises: bonding the sealing gasket (37) of the membrane electrode assembly (30) to the first electrode plate edge portion (11) of the first electrode plate (10) through an adhesive layer (43), so that the membrane electrode assembly (30) remains fixed relative to the first electrode plate (10).

13. The assembly method (300) according to claim 11, wherein, The assembly method further comprises: forming the first sealing strip (41) and the second sealing strip (42) into one piece by injection molding.

14. The assembly method (300) according to any one of claims 11 to 13, wherein, The assembly method further comprises a step (320) of assembling a plurality of fuel cell units, comprising: Repeating the step (310) of assembling a single fuel cell unit on the second electrode plate (20) of the assembled single fuel cell unit (100); or A plurality of assembled fuel cell units (100) are stacked one on top of another.

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