Fuel cell stack

Abstract

The utility model provides a fuel cell stack, which belongs to the field of fuel cells and comprises a stack core body, a sealing insulating plate is arranged on the long side of the stack core body, and a stack shell covers the stack core body and the sealing insulating plate; a gas distribution plate, a distribution plate cover plate, a bottom current collector, a plurality of connecting bodies, a top current collector and a top pressurizing plate are sequentially arranged on the electric pile core body from bottom to top; the top current collector is welded with the bottom current collector; the distribution plate cover plate is fixedly connected with the gas distribution plate; the stack shell is of a hollow cuboid structure with a bottom opening, and the bottom is welded with the outer side of the top surface of the distribution plate cover plate. The bottom current collector and the top current collector are connected in a welded mode, the reaction area of the electric pile core is pressurized, then the electric pile shell is matched with the top pressurizing plate, gas ports in the two sides are pressurized and sealed, and the gas tightness can be improved while the contact resistance is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of fuel cell technology, and in particular relates to a fuel cell stack. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Currently, the main method of fastening fuel cell stacks is bolt fastening. For example, a fuel cell stack disclosed in patent CN210224191U includes a lower end plate, an upper end plate, and a current collector, bipolar plate, sealing gasket, membrane electrode assembly, limiting rod, and bolt assembly located between the two. The bolt assembly presses the assembled stack together.

[0004] The aforementioned battery stack uses a single bolt fastening method, which has some limitations: multi-point bolt fastening may lead to uneven force distribution at various points on the battery stack, resulting in uneven pressurization, making it difficult to simultaneously meet the requirements of reducing contact resistance and improving airtightness; in some cases, the bolts are prone to loosening, leading to insufficient battery stack pressure, performance degradation, or even leakage. Utility Model Content

[0005] The purpose of this invention is to provide a fuel cell stack that pressurizes the reaction zone of the stack core by welding the bottom current collector and the top current collector together. Then, the stack shell and the top pressure plate work together to pressurize and seal the gas ports on both sides of the stack core, which can improve air tightness while reducing contact resistance. In addition, by covering and welding the stack shell to the outside of the stack core, the stack core is protected and the loosening between the stack shell and the stack core can be prevented, which would lead to insufficient pressure at the gas ports.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A fuel cell stack includes a stack core, a sealing insulation plate disposed on the long side of the stack core, and a stack shell covering the stack core and the sealing insulation plate.

[0008] The fuel cell stack core includes a gas distribution plate, a distribution plate cover plate above the gas distribution plate, a bottom current collector above the distribution plate cover plate, several connectors arranged sequentially above the bottom current collector, a top current collector above the connectors, a top pressure plate above the top current collector, and the top current collector and the bottom current collector are welded together; the distribution plate cover plate is fixedly connected to the gas distribution plate.

[0009] The fuel cell stack casing is a hollow cuboid structure with an open bottom, two tabs on the top, and the bottom is welded to the outer side of the top surface of the distribution plate cover.

[0010] Preferably, the gas distribution plate includes two sets of symmetrical distribution channels. Each distribution channel includes a T-shaped air groove on the short side of the gas distribution plate. An air hole is connected to one end of the air groove facing the center of the gas distribution plate. A human-shaped groove is provided on the side facing the center of the gas distribution plate, and a gas combustion hole is provided at the center of the human-shaped groove. Both the air groove and the human-shaped groove have upward openings and do not penetrate the gas distribution plate.

[0011] Preferably, the distribution plate cover includes two sets of symmetrical gas ports, including a rectangular air port on the short side of the distribution plate cover and two circular gas ports. The gas ports are located above the tail of the human-shaped groove, and the air ports are located above the air groove on the short side of the gas distribution plate. Right-angle limiting plates are provided at the four corners of the top surface of the distribution plate cover.

[0012] Preferably, gas ports are also provided on the two short sides of the bottom collector and connector, and their projections in the vertical direction coincide with those of the gas ports on the distribution plate cover.

[0013] Preferably, the connector is in the shape of an "I", with the top surface being a gas combustion zone, including a central gas reaction zone and two gas distribution zones on both sides. The gas distribution zone includes a distribution groove, which is divided into two parts by a gas baffle. The gas baffle is separated at the center line of the short side of the connector to form a gas channel. The bottom surface of the connector is a plane, with an air reaction zone in the middle. A vermiculite gasket is provided on the long side, and a corresponding gas port is provided on the vermiculite gasket.

[0014] Preferably, the bottom current collector includes an intermediate current collector plate, and a first gas distribution plate facing upward is integrally disposed on the long side of the bottom current collector plate; a partition groove is disposed between the first gas distribution plate and the intermediate current collector plate, and the partition groove passes through the bottom current collector plate; the top surface of the intermediate current collector plate is arranged in the same manner as the top surface of the connector.

[0015] Preferably, the top gas collector and the bottom gas collector have the same shape and size, and are also provided with a partition groove. The difference is that the bottom surface of the top gas collector is flat and no gas port is provided. The long side is integrally provided with a downward-facing second gas distribution plate. An electrode through hole is provided on one side of the top gas collector. The first gas distribution plate and the second gas distribution plate are welded together.

[0016] Preferably, a top collector plate is provided between the top collector and the topmost connector. The top collector plate has the same shape as the connector, and both the top and bottom are flat. A vermiculite gasket without a gas outlet is provided at the bottom. A sealing and insulating gasket of the same size and shape without a gas outlet is provided between the vermiculite gasket and the topmost connector.

[0017] Preferably, the bottom surface of the top pressure plate is flat, and the top surface has a groove corresponding to the middle position of the reaction zone. Two tab through holes are provided in the groove, and a notch is provided on the short side. An air baffle is provided on the short side inside the stack shell, and a gap is left between the notch and the short side of the sealing insulation plate for the air baffle to pass through.

[0018] Preferably, sealing insulating gaskets of appropriate shape and size with gas ports are provided between the connectors, between the distribution plate cover and the bottom current collector, and between the bottom current collector and the connectors; on the short side vertical direction of the fuel cell core, the sealing insulating plate, the bottom current collector, the connectors, and the sealing insulating gaskets shall not cover the air ports.

[0019] The technical solution of this utility model has the following beneficial effects:

[0020] This invention pressurizes the reaction zone of the fuel cell core by welding the bottom current collector and the top current collector together. Then, the fuel cell shell and the top pressure plate work together to pressurize and seal the gas ports on both sides of the fuel cell core, which can improve airtightness while reducing contact resistance. In addition, by covering and welding the fuel cell shell to the outside of the fuel cell core, the fuel cell core is protected and the loosening between the fuel cell shell and the fuel cell core can be prevented, which would lead to insufficient pressure at the gas ports. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Figure 1 This is a schematic diagram of the fuel cell stack core according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the fuel cell stack casing according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the gas distribution plate according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the distribution plate cover of an embodiment of the present utility model;

[0026] Figure 5 This is a schematic diagram of the bottom current collector according to an embodiment of the present invention; Figure 6 This is a front view of the connector in an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the back of the connector in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the top current collector according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the back of the top collector plate according to an embodiment of the present utility model;

[0030] Figure 10 This is a schematic diagram of the sealing and insulating plate according to an embodiment of the present utility model;

[0031] Figure 11 This is a schematic diagram of the top pressure plate according to an embodiment of the present utility model;

[0032] Figure 12 This is a schematic diagram of the bottom sealing and insulating gasket according to an embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of a vermiculite gasket with a gas outlet according to an embodiment of the present invention;

[0034] In the picture:

[0035] 1. Gas distribution plate; 11. Air trough; 12. Air hole; 13. Human-shaped groove; 14. Gas ignition hole; 2. Sealing insulation plate; 3. Stack housing; 31. Air baffle; 4. Distribution plate cover; 41. Air port; 42. Gas ignition port; 43. Right-angle limiting plate; 5. Bottom current collector; 51. First gas distribution plate; 52. Separator groove; 6. Connector; 61. Gas reaction zone; 62. Distribution groove; 63. Gas baffle; 64. Gas passage; 65. Vermiculite gasket; 7. Top current collector; 71. Second gas distribution plate; 72. Top current collector plate; 8. Top pressure plate; 81. Notch. Detailed Implementation

[0036] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this utility model.

[0038] This utility model discloses a fuel cell stack, including a stack core, with sealing insulating plates 2 provided on each of the long sides of the stack core, and a stack outer shell 3 covering the stack core and the sealing insulating plates 2. Figure 2 As shown, the fuel cell stack casing 3 is a hollow cuboid structure with an opening at the bottom, and two tabs are provided on its top.

[0039] like Figure 1As shown, the fuel cell stack core includes a gas distribution plate 1, a distribution plate cover 4 above the gas distribution plate 1, a bottom current collector 5 above the distribution plate cover 4, several connectors 6 sequentially arranged above the bottom current collector 5, a top current collector 7 above the connectors 6, and a top pressure plate 8 above the top current collector 7. The top current collector 7 is welded to the bottom current collector 5, enabling pressure application to the internal connectors 6. In this embodiment, the top pressure plate 8 is an insulating plate.

[0040] like Figure 3 As shown, the gas distribution plate 1 includes two sets of distribution channels, which are symmetrically arranged on the gas distribution plate. Each distribution channel includes a T-shaped air groove 11 on the short side of the gas distribution plate 1. One end of the air groove 11 facing the center of the gas distribution plate 1 is connected to an air hole 12. A human-shaped groove 13 is provided on the side of the air groove 11 facing the center of the gas distribution plate 1, and a gas outlet 14 is located at the center of the human-shaped groove 13. It should be noted that both the air groove 11 and the human-shaped groove 13 have upward openings and must not penetrate the gas distribution plate 1. In this embodiment, one side of the distribution channel is the air inlet end, and the other side is the air outlet end. That is, the air hole 12 on one side is connected to an air intake pipe, and the gas outlet 14 is connected to a gas intake pipe; the air hole 12 on the other side is connected to an air outlet pipe, and the gas outlet 14 is connected to a gas outlet pipe.

[0041] like Figure 4 As shown, the distribution plate cover 4 includes two sets of gas ports, which are symmetrically arranged on the distribution plate cover 4. The gas ports include a rectangular air port 41 on the short side of the distribution plate cover 4, and two circular gas ports 42. The gas ports 42 are located above the tail of the man-shaped groove 13, and the air ports 41 are located above the air groove 11 on the short side of the gas distribution plate 1. It can be understood that when the distribution plate cover 4 covers the gas distribution plate 1, the air groove 11 and the man-shaped groove 13 are closed, but gas can enter and exit through the air holes 12 and the gas holes 14, passing through the air groove 11 and the man-shaped groove 13, and then entering and exiting through the air ports 41 and the gas ports 42. The distribution plate cover 4 is fixedly connected to the gas distribution plate 1.

[0042] like Figure 4 As shown, right-angle limiting plates 43 are provided at the four corners of the top surface of the distribution plate cover 4, such as... Figure 1 As shown, the bottom current collector 5 and the multiple connecting bodies 6 above the bottom current collector 5 are confined between four right-angle limiting plates 43. Figure 5 As shown, gas outlets 42 are also provided on both sides of the bottom collector 5, and their vertical projections coincide with those of the gas outlets 42 on the distribution plate cover 4. Figure 6 As shown, both ends of the connector 6 are also provided with gas ports 42, and their vertical projections coincide with those of the gas ports 42 on the distribution plate cover 4. Figure 1 , Figure 12As shown, a bottom sealing insulating gasket with a corresponding shape and size and a gas outlet 42 is provided between the distribution plate cover 4 and the bottom collector 5. By providing the bottom sealing insulating gasket, insulation and sealing are achieved between the distribution plate cover 4 and the bottom collector 5.

[0043] like Figure 1 As shown, the long and short sides of the bottom sealing insulating gasket, the bottom current collector 5, and the connector 6 are all smaller than the distribution plate cover 4. The air vent 41 of the distribution plate cover 4 must not be blocked vertically by the bottom current collector 5, the connector 6, or the bottom sealing insulating gasket. This is done so that when the fuel cell stack casing 3 covers the outside of the fuel cell stack core, air is supplied through the air intake pipe on one side of the air vent 41, and air is discharged through the air outlet pipe on the other side. Under pressure, air is supplied upwards to each connector 6 through one side of the air vent 41, and each connector 6 also discharges air through the other side of the air vent 41. Figure 6 As shown, the connecting body 6 is in the shape of an "I" character. Its top surface is the gas combustion zone, including a central gas reaction zone 61 and gas distribution zones on both sides. The gas distribution zone includes a distribution groove 62. The gas inlet of the connecting body 6 is located within the distribution groove. The distribution groove 62 is divided into two parts by a gas baffle 63, which is positioned along the center line of the short side of the connecting body 6, forming a gas channel 64. When gas (fuel gas) enters the distribution groove through the gas inlet on the connecting body 6, it converges under the action of the gas baffle 63, and then is evenly dispersed again through the gas channel 64 before entering the gas reaction zone 61.

[0044] like Figure 7 As shown, the bottom surface of connector 6 is flat, with an air reaction zone in the middle, preventing combustion gases from entering the bottom surface of connector 6. A vermiculite gasket 65 with a combustion gas port is provided on the long side of the bottom of connector 6, forming a groove-like structure between the vermiculite gaskets 65. It should be noted that when connectors 6 are stacked, sealing and insulating gaskets of corresponding shape and size with combustion gas ports are also provided between connectors 6. These sealing and insulating gaskets seal the groove on the top surface of the lower connector 6, allowing combustion gases to flow only in the space between the top surface of connector 6 and the sealing and insulating gaskets, preventing air from entering. On the bottom surface of the upper connector 6, under the action of the insulating sealing plate and the vermiculite gaskets 65, the short side of the groove-like structure is open, while the long side is closed, allowing air to enter from the short side. Figure 13 As shown, the vermiculite gasket 65 with a gas port is provided with a corresponding gas port so that gas can pass through.

[0045] It is easy to understand that connector 6 can separate the gas from the air, while also playing a role in evenly distributing the gas and conducting electricity.

[0046] like Figure 5As shown, the bottom current collector 5 includes an intermediate current collector plate with the same shape and size as the connecting body 6. A first gas distribution plate 51, L-shaped, is integrally formed on the long side of the bottom current collector 5, facing upwards. A partition groove 52 is provided between the first gas distribution plate 51 and the intermediate current collector plate, penetrating the bottom current collector 5. The partition groove allows the first gas distribution plate 51 and both ends of the bottom current collector 5 to apply pressure to the connecting body 6. Figure 5 As shown, the top surface of the intermediate manifold plate is arranged in the same way as the top surface of the connector 6, including the central gas reaction zone 61 and the gas distribution zones on both sides. The gas distribution zone also includes a distribution groove 62, which is divided into two parts by a gas baffle 63. The gas baffle 63 is also separated by the center line of the short side of the connector 6, forming a gas channel 64. The difference is that the bottom of the bottom manifold 5 does not have a vermiculite gasket 65, but instead has a sealing and insulating gasket of the corresponding shape and size with a gas outlet 42. A sealing and insulating gasket of the corresponding size and shape with a gas outlet is also provided between the bottom manifold 5 and the connector 6. The sealing and insulating gaskets achieve the functions of sealing and insulation.

[0047] like Figure 8 As shown, the top current collector 7 and the bottom current collector 5 have the same shape and size, and are also provided with a partition groove. The difference is that the bottom surface of the top current collector 7 is flat and does not have a gas port, which prevents the gas from continuing to rise. The long side of the top current collector 7 is integrally provided with a downward-facing second gas distribution plate 71, which is inverted L-shaped. A tab through hole is provided on one side of the top current collector 7 for passing through a tab.

[0048] A top collector plate 72 is provided between the top collector 7 and the topmost connecting body 6. The top collector plate 72 has the same shape as the connecting body 6, such as... Figure 9 As shown, the top and bottom of the top current collector 72 are both flat. A vermiculite gasket without a gas outlet is provided at the bottom of the top current collector 72. A sealing and insulating gasket without a gas outlet of the corresponding size and shape is provided between the vermiculite gasket and the topmost connecting body 6. The bottom current collector and the top current collector can collect the current in the fuel cell core.

[0049] All of the aforementioned sealing and insulating gaskets also serve an insulating function while providing a seal, ensuring the normal operation of the fuel cell core.

[0050] like Figure 1As shown, the first gas distribution plate 51 and the second gas distribution plate 71 are welded together after being joined, and pressure is applied to the connecting body 6 inside them in the vertical direction; under the action of the partition groove 52, the welded top current collector 7 and bottom current collector 5 apply pressure to the reaction zone in the middle of the connecting body 6. By first pressurizing the bottom current collector and the top current collector and then welding them, the flow collection from bottom to top is satisfied, while pressure is also provided to the middle reaction zone. Figure 5 , Figure 8 As shown, the top of the first gas distribution plate 51 and the bottom of the second gas distribution plate 71 are both integrally provided with half plates for docking.

[0051] like Figure 1 , Figure 11 As shown, the bottom surface of the top pressure plate 8 is flat and is set close to the top surface of the top current collector 7. A slot is cut into the middle of the top surface of the top pressure plate 8 corresponding to the reaction zone, with two tab through holes inside the slot and a notch 81 on the short side. The reason for the slot in the middle of the top pressure plate 8 is that when the fuel cell core is covered by the fuel cell housing 3, the top of the fuel cell housing 3 only contacts the two short sides of the top pressure plate 8. Then, when the fuel cell housing 3 is pressed down, the two short sides of the top pressure plate 8 apply pressure to both the top current collector 7 and the two short sides of the connector 6, achieving separate pressurization of the gas outlet to meet the sealing requirements of the gas outlet, thus completing the secondary pressurization of the fuel cell core. By employing two pressurization methods—pressurized welding between the bottom current collector and the top current collector, and the pressing of the top pressure plate 8 by the fuel cell housing—regional pressurization of the fuel cell core is achieved, making it easier to meet both electrical performance and fuel cell airtightness requirements.

[0052] like Figure 1 , Figure 10 As shown, the sealing insulation plate 2 is set on the long side of the fuel cell core. On the short side of the fuel cell core, the sealing insulation plate 2 must not cover the air vent 41. The function of the notch 81 is that after the sealing insulation plate 2 is set on the long side of the fuel cell core, when the fuel cell outer shell 3 is pressed down, the notch 81 can prevent the sealing insulation plate 2 from interfering with the top pressure plate 8.

[0053] like Figure 2 As shown, inside the fuel cell stack casing 3, an air baffle 31 is provided on the short side. A gap is left between the notch 81 and the short side of the sealing insulation plate 2 for the air baffle 31 to pass through. The bottom of the fuel cell stack casing 3 is welded to the outer side of the top surface of the distribution plate cover 4 of the fuel cell stack core.

[0054] It is understandable that after the fuel cell stack casing 3 is welded to the gas distribution plate 1, under the action of the air baffle 31, the air port 41 faces upward, forming an air channel inside the fuel cell stack casing 3. In this embodiment, it is easy to understand that when gas is introduced into the air port and the gas port on one side, the air is dispersed through the air groove 11, then flows upward into the air channel through the air port, then passes through the bottom surface of each connector 6, and enters the air channel on the opposite side under pressure, passes through the air port on the other side, and finally flows downward from the air outlet pipe; the gas is dispersed through the human-shaped groove, enters the top surface of each connector through the gas port, enters the distribution groove 62 at the top of the connector 6 and is collected, then redistributed evenly into the gas reaction zone through the gas channel 64, and under pressure, enters the distribution groove 62 on the other side, and finally enters the gas port on the other side, flowing downward from the gas outlet pipe.

[0055] like Figure 1 , Figure 2 As shown, two tabs are provided on the top of the fuel cell stack housing 3. One tab passes through the top of the fuel cell stack housing 3, the top pressure plate 8, and the top current collector 7, while the other tab only passes through the top of the fuel cell stack housing 3 and the top pressure plate 8.

[0056] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A fuel cell stack, characterized in that, The fuel cell stack includes a core, a sealing insulation plate is provided on the long side of the core, and a fuel cell stack outer shell covers the core and the sealing insulation plate. The fuel cell stack core includes a gas distribution plate, a distribution plate cover plate above the gas distribution plate, a bottom current collector above the distribution plate cover plate, several connectors arranged sequentially above the bottom current collector, a top current collector above the connectors, a top pressure plate above the top current collector, and the top current collector and the bottom current collector are welded together; the distribution plate cover plate is fixedly connected to the gas distribution plate. The stack casing is a hollow cuboid structure with an open bottom, two tabs on the top, and the bottom is welded to the outer side of the top surface of the distribution plate cover.

2. A fuel cell stack as described in claim 1, characterized in that, The gas distribution plate includes two sets of symmetrical gas distribution channels. Each gas distribution channel includes a T-shaped air groove on the short side of the gas distribution plate. An air hole is connected to one end of the air groove facing the center of the gas distribution plate. A human-shaped groove is provided on the side facing the center of the gas distribution plate, and a gas combustion hole is provided in the center of the human-shaped groove. Both the air groove and the human-shaped groove have their openings facing upwards and do not penetrate the gas distribution plate.

3. A fuel cell stack as described in claim 2, characterized in that, The distribution plate cover includes two sets of symmetrical gas ports, including a rectangular air port on the short side of the distribution plate cover and two circular gas ports. The gas ports are located above the tail of the human-shaped groove, and the air ports are located above the air groove on the short side of the gas distribution plate. Right-angle limiting plates are provided at the four corners of the top surface of the distribution plate cover.

4. A fuel cell stack as described in claim 3, characterized in that, Gas inlets are also provided on the two short sides of the bottom collector and connector, and their projections in the vertical direction coincide with those of the gas inlets on the distribution plate cover.

5. A fuel cell stack as described in claim 1, characterized in that, The connector is "I" shaped, with the top surface being the gas combustion zone, including a central gas reaction zone and gas distribution zones on both sides. The gas distribution zone includes a distribution groove, which is divided into two parts by a gas baffle. The gas baffle is separated at the center line of the short side of the connector, forming a gas channel. The bottom surface of the connector is flat, with an air reaction zone in the middle. Vermiculite gaskets are provided on the long side, and corresponding gas ports are provided on the vermiculite gaskets.

6. A fuel cell stack as described in claim 1, characterized in that, The bottom collector includes a middle collector plate, and a first gas distribution plate facing upwards is integrally set on the long side of the bottom collector. A partition groove is set between the first gas distribution plate and the middle collector plate, and the partition groove runs through the bottom collector. The top surface of the middle collector plate is arranged in the same way as the top surface of the connector.

7. A fuel cell stack as described in claim 6, characterized in that, The top gas collector and the bottom gas collector have the same shape and size, and are also provided with partition grooves. The difference is that the bottom surface of the top gas collector is flat and there is no gas port. The long side is integrally provided with a downward-facing second gas distribution plate. An electrode through hole is provided on one side of the top gas collector. The first gas distribution plate and the second gas distribution plate are welded together.

8. A fuel cell stack as described in claim 1, characterized in that, A top collector plate is installed between the top collector and the topmost connector. The top collector plate has the same shape as the connector, and both the top and bottom are flat. A vermiculite gasket without a gas port is installed at the bottom. A sealing and insulating gasket of the same size and shape without a gas port is installed between the vermiculite gasket and the topmost connector.

9. A fuel cell stack as described in claim 1, characterized in that, The bottom surface of the top pressure plate is flat, and the top surface has a groove in the middle of the corresponding reaction zone. Two tab through holes are provided in the groove, and a notch is provided on the short side. An air baffle is provided on the short side inside the stack shell. A gap is left between the notch and the short side of the sealing insulation plate for the air baffle to pass through.

10. A fuel cell stack as described in claim 1, characterized in that, Sealing and insulating gaskets of appropriate shape and size with gas ports are provided between the connectors, between the distribution plate cover and the bottom current collector, and between the bottom current collector and the connectors. On the short side of the fuel cell core, the sealing and insulating plate, the bottom current collector, the connectors, and the sealing and insulating gaskets shall not cover the air ports.

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