Closed Cathode Air-Cooled Fuel Cell Device

Abstract

The present invention provides a closed cathode air-cooled fuel cell device, which includes a first end plate, a second end plate, a plurality of single cells, a blower and a fan. The plurality of single cells are stacked between the first end plate and the second end plate; each single cell includes an anode flat plate, a cooling corrugated plate, a cathode graphite plate and a membrane electrode assembly which are stacked in sequence. A plurality of cooling air channels are formed between the cooling corrugated plate and the anode flat plate. A plurality of reaction air channels are arranged on the side of the cathode graphite plate facing away from the cooling corrugated plate. The membrane electrode assembly has a plurality of hydrogen gas flow channel grooves for hydrogen gas to flow through; the blower is installed on the front surface of the first end plate, and the blower provides reaction air for the reaction air channels of the single cells. The fan is installed on the side surfaces of the first end plate and the second end plate, and the fan provides cooling air for the cooling air channels of the single cells. Through the technical solution provided by the present invention, the processing cost can be reduced while ensuring the performance and service life of the closed cathode air-cooled fuel cell device.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a closed cathode air-cooled fuel cell device. Background Art

[0002] The single cells in the closed cathode air-cooled fuel cell device usually use hydrogen as the fuel gas, oxygen in the air as the oxidant, and excess air as the cooling gas to cool the stack and ensure that the air-cooled fuel cell remains at normal operating temperature. The single cells in traditional fuel cell devices are mostly open cathode structures. The reaction air on the cathode and the cooling air use the same air fluid. The air fluid passing through the air flow channel not only participates in the cathode oxidation reaction, but also takes away a large amount of reaction heat in the single cell, making it impossible for the staff to separately and accurately control the flow of the cathode reaction air and cooling air, resulting in excessive or insufficient water in the membrane electrode assembly, making it impossible to simultaneously ensure the heat dissipation effect and internal humidity in the fuel cell device, affecting the performance and service life of the fuel cell device.

[0003] The prior art provides a fuel cell metal bipolar plate and a cathode closed air-cooled stack, which realizes the separation of the reaction air flow channel and the cooling air flow channel, but has a complex structure and high processing cost, and is not suitable for mass production. Summary of the invention

[0004] The present invention provides a closed cathode air-cooled fuel cell device, which reduces the processing cost while ensuring the performance and life of the closed cathode air-cooled fuel cell device.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a closed cathode air-cooled fuel cell device, comprising a first end plate, a second end plate, a plurality of single cells, a blower and a fan, wherein the plurality of single cells are stacked between the first end plate and the second end plate; the single cell comprises an anode plate, a cooling corrugated plate, a cathode graphite plate and a membrane electrode assembly which are stacked in sequence, a plurality of cooling air flow channels are formed between the cooling corrugated plate and the anode plate, a plurality of reaction air flow channels are arranged on the side of the cathode graphite plate away from the cooling corrugated plate, and the membrane electrode assembly has a plurality of hydrogen flow channel grooves for hydrogen circulation; the blower is installed on the front side of the first end plate, and the blower provides reaction air for the reaction air flow channels of the single cells, and the fan is installed on the sides of the first end plate and the second end plate, and the fan provides cooling air for the cooling air flow channels of the single cells.

[0006] Furthermore, the cooling corrugated plate and the anode plate are welded, and the cooling corrugated plate has a plurality of convex ribs arranged in parallel, and the area between each convex rib and the anode plate forms a cooling air flow channel.

[0007] Further, the cooling air flow channel extends along the width direction of the anode plate, the reaction air flow channel extends along the width direction of the anode plate, and the hydrogen gas flow channel groove extends along the length direction of the anode plate.

[0008] Further, one side of the cathode graphite plate facing the anode plate has an assembly groove, and the anode plate and the cooling corrugated plate are located in the assembly groove.

[0009] Further, the closed cathode air-cooled fuel cell device has an air input flow channel, an air output flow channel, a hydrogen gas input flow channel, and a hydrogen gas output flow channel that penetrate through multiple single cells. The air input flow channel and the hydrogen gas input flow channel are located on one side of the reaction air flow channel, and the air output flow channel and the hydrogen gas output flow channel are located on the other side of the reaction air flow channel; among them, the outlet of the fan is communicated with the air input flow channel, and the air input flow channel, the reaction air flow channel, and the air output flow channel are communicated in sequence. The hydrogen gas input flow channel, the hydrogen gas flow channel groove, and the hydrogen gas output flow channel are communicated in sequence.

[0010] Further, the single cell also includes a first metal gasket and a second metal gasket. The first metal gasket is arranged around the air input flow channel. One side of the first metal gasket is sealingly matched with the membrane electrode assembly, and there is an input gap between the other side of the first metal gasket and the cathode graphite plate. The air input flow channel is communicated with the reaction air flow channel through the input gap; the second metal gasket is arranged around the air output flow channel. One side of the second metal gasket is sealingly matched with the membrane electrode assembly, and there is an output gap between the other side of the second metal gasket and the cathode graphite plate. The air output flow channel is communicated with the reaction air flow channel through the output gap.

[0011] Further, the single cell also includes an input hydrogen gas sealing ring, an output hydrogen gas sealing ring, an input air sealing ring, and an output air sealing ring located on the cathode graphite plate. The input hydrogen gas sealing ring is arranged around the hydrogen gas input flow channel, the output hydrogen gas sealing ring is arranged around the hydrogen gas output flow channel, the input air sealing ring is arranged around the air input flow channel and is located between the cathode graphite plate and the anode plate, and the output air sealing ring is arranged around the air output flow channel and is located between the cathode graphite plate and the anode plate.

[0012] Further, the single cell also includes an air outer sealing ring. The air outer sealing ring surrounds multiple reaction air flow channels, and the air outer sealing ring is located between the cathode graphite plate and the membrane electrode assembly.

[0013] Further, the closed cathode air-cooled fuel cell device also includes a rubber tube, an air joint, and a hydrogen gas quick-connect joint. The air joint is installed on the front surface of the first end plate. The outlet of the fan is connected to the air joint through the rubber tube, and the air joint is communicated with the air input flow channel. The hydrogen gas quick-connect joint is installed on the front surface of the first end plate, and the hydrogen gas quick-connect joint is communicated with the hydrogen gas input flow channel.

[0014] Further, the membrane electrode assembly includes an anode carbon paper and a flow channel carbon paper, and a plurality of hydrogen flow channel grooves are engraved on the flow channel carbon paper.

[0015] Further, the single cell further includes a hydrogen outer sealing ring that surrounds the plurality of hydrogen flow channel grooves, and the hydrogen outer sealing ring is located between the anode carbon paper of a single cell and the anode plate of an adjacent single cell.

[0016] Further, the closed cathode air-cooled fuel cell device further includes a first insulating plate, a second insulating plate, a mounting seat, and a protective cover. The first insulating plate is located between the first end plate and the plurality of single cells, and the side of the first insulating plate facing the plurality of single cells has a copper plating layer. The second insulating plate is located between the second end plate and the plurality of single cells, and the side of the second insulating plate facing the plurality of single cells has a copper plating layer. The mounting seat is installed on the front surface of the first end plate, the fan is installed on the mounting seat, and the protective cover is installed on the sides of the first end plate and the second end plate, and the protective cover covers the fan.

[0017] By applying the technical solution of the present invention, a closed cathode air-cooled fuel cell device is provided, comprising a first end plate, a second end plate, a plurality of single cells, a blower and a fan, wherein the plurality of single cells are stacked between the first end plate and the second end plate; the single cell comprises an anode plate, a cooling corrugated plate, a cathode graphite plate and a membrane electrode assembly which are stacked in sequence, a plurality of cooling air flow channels are formed between the cooling corrugated plate and the anode plate, a plurality of reaction air flow channels are arranged on the side of the cathode graphite plate away from the cooling corrugated plate, and the membrane electrode assembly has a plurality of hydrogen flow channel grooves for hydrogen circulation; the blower is installed on the front side of the first end plate, and the blower provides reaction air for the reaction air flow channels of the single cells, and the fan is installed on the sides of the first end plate and the second end plate, and the fan provides cooling air for the cooling air flow channels of the single cells. By adopting this scheme, the cooling air can cool the inside of the single cell along the cooling air flow channels formed between the cooling wave plate and the anode plate; the reaction air can enter the inside of the single cell along the reaction air flow channels and provide reaction air through the multiple reaction air flow channels arranged on the cathode graphite plate. This arrangement realizes the diversion of cooling air and reaction air, and avoids the co-flow of cooling air and reaction air in most air-cooled fuel cell devices in the prior art, which makes it impossible for staff to separately and accurately control the flow rates of cathode reaction air and cooling air, and then there is too much water or lack of water in the membrane electrode assembly, so that the heat dissipation effect and internal humidity in the single cell cannot be guaranteed at the same time, thereby ensuring the reliability of the staff's control over the heat dissipation effect and internal temperature of the single cell, and improving the performance and service life of the closed cathode air-cooled fuel cell device. Furthermore, the cathode graphite plate in the present solution is made of graphite material, which has better durability, and reduces the processing cost of the single cell while increasing the service life of the air-cooled fuel cell device. Compared with the stacking method of the single cell in the prior art in which the cathode plate, the membrane electrode and the anode plate are stacked in sequence, the present solution adopts a stacking method in which the cathode graphite plate, the membrane electrode assembly and the anode flat plate are stacked in sequence, and the hydrogen flow channel groove set on the anode plate in the prior art is transferred to the membrane electrode assembly of the present solution, which further reduces the processing cost of the single cell and improves the applicability of the closed cathode air-cooled fuel cell device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic structural diagram of a closed cathode air-cooled fuel cell device provided by an embodiment of the present invention is shown;

[0020] Figure 2 Shows Figure 1Schematic diagram of the structure of a single cell in a closed cathode air-cooled fuel cell device;

[0021] Figure 3 shows Figure 2 Schematic diagram of the connection between the anode flat plate and the cooling corrugated plate in the single cell;

[0022] Figure 4 shows Figure 2 Schematic diagram of the structure of the cathode graphite plate, the first metal gasket, the air outer seal ring, and the input hydrogen seal ring in the single cell;

[0023] Figure 5 shows Figure 2 Schematic diagram of the structure of the cathode graphite plate, the input air seal ring, and the input hydrogen seal ring in the single cell;

[0024] Figure 6 shows Figure 2 Schematic diagram of the structure of the membrane electrode assembly and the hydrogen outer seal ring in the single cell.

[0025] Among them, the above-mentioned drawings include the following reference numerals:

[0026] 10. First end plate; 20. Second end plate; 30. Single cell; 31. Anode flat plate; 32. Cooling corrugated plate; 33. Cathode graphite plate; 331. Reaction air flow channel; 332. Assembly groove; 34. Membrane electrode assembly; 341. Hydrogen flow channel groove; 342. Anode carbon paper; 343. Flow channel carbon paper; 35. Cooling air flow channel; 361. First metal gasket; 371. Air outer seal ring; 372. Hydrogen outer seal ring; 373. Input air seal ring; 374. Input hydrogen seal ring; 40. Fan; 50. Fan; 60. Rubber tube; 70. Air joint; 90. First insulating plate; 100. Second insulating plate; 110. Mounting seat; 120. Protective cover. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Such as Figures 1 to 6As shown in the figure, an embodiment of the present invention provides a closed cathode air-cooled fuel cell device, which includes a first end plate 10, a second end plate 20, a plurality of single cells 30, a blower 40 and a fan 50. The plurality of single cells 30 are stacked between the first end plate 10 and the second end plate 20; the single cell 30 includes an anode flat plate 31, a cooling corrugated plate 32, a cathode graphite plate 33 and a membrane electrode assembly 34 stacked in sequence. A plurality of cooling air channels 35 are formed between the cooling corrugated plate 32 and the anode flat plate 31. A plurality of reaction air channels 331 are provided on the side of the cathode graphite plate 33 facing away from the cooling corrugated plate 32. The membrane electrode assembly 34 has a plurality of hydrogen gas flow channels 341 for hydrogen gas to flow through; the blower 40 is installed on the front surface of the first end plate 10, and the blower 40 provides reaction air for the reaction air channels 331 of the single cell 30. The fan 50 is installed on the side surface of the first end plate 10 and the second end plate 20, and the fan 50 provides cooling air for the cooling air channels 35 of the single cell 30.

[0029] In this embodiment, through the plurality of cooling air channels 35 formed between the cooling corrugated plate 32 and the anode flat plate 31, the cooling air can cool the inside of the single cell 30 along the cooling air channels 35; through the plurality of reaction air channels 331 provided on the cathode graphite plate 33, the reaction air can enter the inside of the single cell 30 along the reaction air channels 331 and provide reaction air. With this setting, the diversion of the cooling air and the reaction air is realized, avoiding the co-flow of the cooling air and the reaction air in most of the air-cooled fuel cell devices in the prior art, which causes the staff to be unable to separately and accurately control the flow rates of the cathode reaction air and the cooling air, and then there is too much or too little water in the membrane electrode assembly, resulting in the situation where the heat dissipation effect and the internal humidity in the single cell cannot be guaranteed at the same time. This ensures the reliability of the staff's control of the heat dissipation effect and the internal temperature of the single cell 30, and improves the performance and service life of the closed cathode air-cooled fuel cell device. Further, the cathode graphite plate 33 in this solution is made of graphite material, which has better durability, improves the service life of the air-cooled fuel cell device while reducing the processing cost of the single cell 30. And compared with the stacking method in the prior art where the cathode plate, the membrane electrode and the anode plate are stacked in sequence for the single cell, this solution adopts the stacking method of the cathode graphite plate 33, the membrane electrode assembly 34 and the anode flat plate 31 in sequence, and transfers the hydrogen gas flow channels 341 provided on the anode plate in the prior art to the membrane electrode assembly 34 in this solution, further reducing the processing cost of the single cell 30 and improving the applicability of the closed cathode air-cooled fuel cell device.

[0030] As Figure 2 and Figure 3As shown, the cooling corrugated plate 32 is welded to the anode flat plate 31. The cooling corrugated plate 32 has a plurality of convex ribs arranged in parallel. The area between each convex rib and the anode flat plate 31 forms a cooling air flow channel 35. This setting facilitates the processing of the cooling air flow channel 35 and further reduces the processing cost of the closed cathode air-cooled fuel cell device. The cooling corrugated plate 32 is welded to the anode flat plate 31, ensuring the reliability of the connection and the stability of the formation of the cooling air flow channel 35.

[0031] As Figures 2 to 6 shown, the cooling air flow channel 35 extends along the width direction of the anode flat plate 31, the reaction air flow channel 331 extends along the width direction of the anode flat plate 31, and the hydrogen gas flow channel groove 341 extends along the length direction of the anode flat plate 31.

[0032] In this embodiment, the cooling air flow channel 35 and the reaction air flow channel 331 extend in the same direction, ensuring the reliability and completeness of the cooling of the heat generated by the reaction of the reaction air flow channel 331 by the cooling air flow channel 35. The reaction air flow channel 331 and the hydrogen gas flow channel groove 341 extend perpendicular to each other, ensuring the completeness of the reaction between hydrogen gas and reaction air and improving the performance of the closed cathode air-cooled fuel cell device.

[0033] As Figure 5 shown, the side of the cathode graphite plate 33 facing the anode flat plate 31 has an assembly groove 332, and the anode flat plate 31 and the cooling corrugated plate 32 are located in the assembly groove 332. This setting facilitates the connection of the anode flat plate 31 and the cooling corrugated plate 32 to the cathode graphite plate 33 by welding, ensuring the reliability and accuracy of the connection and reducing the processing cost of the single cell 30. Specifically, Figure 4 and Figure 5 are schematic diagrams of the front and back sides of the cathode graphite plate 33.

[0034] As Figure 2 shown, the closed cathode air-cooled fuel cell device has an air input flow channel, an air output flow channel, a hydrogen gas input flow channel, and a hydrogen gas output flow channel that penetrate through a plurality of single cells 30. The air input flow channel and the hydrogen gas input flow channel are located on one side of the reaction air flow channel 331, and the air output flow channel and the hydrogen gas output flow channel are located on the other side of the reaction air flow channel 331; among them, the outlet of the fan 40 is communicated with the air input flow channel, and the air input flow channel, the reaction air flow channel 331, and the air output flow channel are communicated in sequence, and the hydrogen gas input flow channel, the hydrogen gas flow channel groove 341, and the hydrogen gas output flow channel are communicated in sequence.

[0035] In this embodiment, a single cell 30 is formed by sequentially stacking a membrane electrode assembly 34, a cathode graphite plate 33, and an anode flat plate 31. The membrane electrode assembly 34 has symmetrically arranged first air inlets, first air outlets, first hydrogen inlets, and first hydrogen outlets on both sides in the length direction of the anode flat plate 31. The first air inlets and the first hydrogen inlets are located on the same side of the membrane electrode assembly 34; the cathode graphite plate 33 has symmetrically arranged second air inlets, second air outlets, second hydrogen inlets, and second hydrogen outlets on both sides in the length direction of the anode flat plate 31. The second air inlets and the second hydrogen inlets are located on the same side of the cathode graphite plate 33; the anode flat plate 31 has symmetrically arranged third air inlets, third air outlets, third hydrogen inlets, and third hydrogen outlets on both sides in its own length direction. The third air inlets and the third hydrogen inlets are located on the same side of the anode flat plate 31. The channels connected by the first air inlets, the second air inlets, and the third air inlets form an air input sub-channel of a single cell 30, and the air input sub-channels of multiple single cells 30 are stacked and connected to form an air input channel; the channels connected by the first air outlets, the second air outlets, and the third air outlets form an air output sub-channel of a single cell 30, and the air output sub-channels of multiple single cells 30 are stacked and connected to form an air output channel; the channels connected by the first hydrogen inlets, the second hydrogen inlets, and the third hydrogen inlets form a hydrogen input sub-channel of a single cell 30, and the hydrogen input sub-channels of multiple single cells 30 are stacked and connected to form a hydrogen input channel; the channels connected by the first hydrogen outlets, the second hydrogen outlets, and the third hydrogen outlets form a hydrogen output sub-channel of a single cell 30, and the hydrogen output sub-channels of multiple single cells 30 are stacked and connected to form a hydrogen output channel. With such an arrangement, reaction air is introduced into the air input channel through a blower 40, and the reaction air flows through a reaction air channel 331 located between the air input channel and the air output channel; hydrogen is introduced through the hydrogen input channel and flows through a hydrogen channel groove 341 located between the hydrogen input channel and the hydrogen output channel, ensuring the reliability of the reaction inside the single cell 30.

[0036] As Figure 4 shown, the single cell 30 further includes a first metal gasket 361 and a second metal gasket. The first metal gasket 361 is arranged around the air input channel. One side of the first metal gasket 361 is in sealed cooperation with the membrane electrode assembly 34, and there is an input gap between the other side of the first metal gasket 361 and the cathode graphite plate 33. The air input channel is connected to the reaction air channel 331 through the input gap; the second metal gasket is arranged around the air output channel. One side of the second metal gasket is in sealed cooperation with the membrane electrode assembly 34, and there is an output gap between the other side of the second metal gasket and the cathode graphite plate 33. The air output channel is connected to the reaction air channel 331 through the output gap.

[0037] In this embodiment, the first metal gasket 361 and the second metal gasket are respectively arranged around the second air inlet and the second air outlet on the side of the cathode graphite plate 33 facing the membrane electrode assembly 34, and both the first metal gasket 361 and the second metal gasket are located between the cathode graphite plate 33 and the membrane electrode assembly 34. Among them, the reaction air flows into the reaction air flow channel 331 through the input gap between the side of the first metal gasket 361 close to the cathode graphite plate 33 and the cathode graphite plate 33, and flows out through the output gap between the side of the cathode graphite plate 33 close to the cathode graphite plate 33 and the cathode graphite plate 33, ensuring the circulation of the reaction air and the performance of the single cell 30. At the same time, through the sealing cooperation between the first metal gasket 361 and the membrane electrode assembly 34, and between the second metal gasket and the membrane electrode assembly 34, the reaction air will not enter the hydrogen gas flow channel groove 341 of the membrane electrode assembly 34, ensuring the airtightness of the membrane electrode assembly 34.

[0038] As Figure 4 and Figure 5 shown, the single cell 30 further includes an input hydrogen sealing ring 374, an output hydrogen sealing ring, an input air sealing ring 373 and an output air sealing ring located on the cathode graphite plate 33. The input hydrogen sealing ring 374 is arranged around the hydrogen input flow channel, the output hydrogen sealing ring is arranged around the hydrogen output flow channel, the input air sealing ring 373 is arranged around the air input flow channel and is located between the cathode graphite plate 33 and the anode flat plate 31, and the output air sealing ring is arranged around the air output flow channel and is located between the cathode graphite plate 33 and the anode flat plate 31.

[0039] In this embodiment, both the input hydrogen sealing ring 374 and the output hydrogen sealing ring are two. The input hydrogen sealing ring 374 is arranged around the second hydrogen inlet, the output hydrogen sealing ring is arranged around the second hydrogen outlet. The two input hydrogen sealing rings 374 are respectively arranged on the upper and lower sides of the cathode graphite plate 33, and the two hydrogen output sealing rings are respectively arranged on the upper and lower sides of the cathode graphite plate 33. The input air sealing ring 373 is arranged around the second air inlet, the output air sealing ring is arranged around the second air outlet. The input air sealing ring 373 and the first metal gasket 361 are located on the upper and lower sides of the cathode graphite plate 33, and the output air sealing ring and the second metal gasket are located on the upper and lower sides of the cathode graphite plate 33. By setting the above-mentioned sealing rings in this way to block the gaps between the cathode graphite plate 33 and the anode flat plate 31, and between the cathode graphite plate 33 and the membrane electrode assembly 34, hydrogen is prevented from flowing into the cooling air flow channel 35 or the reaction air flow channel 331, ensuring the reliability of the single cell 30, and further ensuring the reliability of the closed cathode air-cooled fuel cell device.

[0040] Specifically, the single cell 30 further includes an air outer sealing ring 371. The air outer sealing ring 371 surrounds a plurality of reaction air flow channels 331, and the air outer sealing ring 371 is located between the cathode graphite plate 33 and the membrane electrode assembly 34. With this arrangement, the air outer sealing ring 371 seals the outer edges of the cathode graphite plate 33 and the membrane electrode assembly 34, thereby sealing the reaction air flow channels 331, preventing the leakage of reaction air, and ensuring the reliability of the closed cathode air-cooled fuel cell device.

[0041] As Figure 1 shown, the closed cathode air-cooled fuel cell device further includes a rubber tube 60, an air connector 70, and a hydrogen quick-connect fitting. The air connector 70 is installed on the front surface of the first end plate 10. The outlet of the blower 40 is connected to the air connector 70 through the rubber tube 60, and the air connector 70 communicates with the air input flow channel. The hydrogen quick-connect fitting is installed on the front surface of the first end plate 10, and the hydrogen quick-connect fitting communicates with the hydrogen input flow channel. With this arrangement, the reaction air in the air input flow channel is input through the blower 40, the rubber tube 60, and the air connector 70, and the reaction hydrogen in the hydrogen input flow channel is directionally input through the hydrogen quick-connect fitting, ensuring the reliability of gas input and further ensuring the reliability of the closed cathode air-cooled fuel cell device.

[0042] As Figure 6 shown, the membrane electrode assembly 34 includes an anode carbon paper 342 and a flow channel carbon paper 343. A plurality of hydrogen flow channel grooves 341 are engraved on the flow channel carbon paper 343. With this arrangement, it is convenient for the installation and composition of the membrane electrode assembly 34 and the processing and setting of the hydrogen flow channel grooves 341, with a simple structure and low manufacturing cost. Optionally, this arrangement can also be compatible with an open cathode air-cooled fuel cell, having good compatibility.

[0043] Optionally, the membrane electrode assembly 34 further includes a cathode carbon paper and a proton exchange membrane. The proton exchange membrane is located between the anode carbon paper 342 and the cathode carbon paper. Among them, the cathode carbon paper contacts the cathode graphite plate 33, and the anode carbon paper 342 in one single cell contacts the anode plate 31 in another single cell 30.

[0044] Specifically, the single cell 30 further includes a hydrogen outer sealing ring 372. The hydrogen outer sealing ring 372 surrounds a plurality of hydrogen flow channel grooves 341, and the hydrogen outer sealing ring 372 is located between the anode carbon paper 342 of one single cell 30 and the anode plate 31 of an adjacent single cell 30. In this embodiment, the hydrogen outer sealing ring 372 seals the hydrogen flow channel grooves 341, preventing the leakage of reaction hydrogen in the hydrogen flow channel grooves 341, ensuring the reliability of the single cell 30, and further ensuring the reliability of the closed cathode air-cooled fuel cell device.

[0045] Optionally, the outer hydrogen sealing ring 372 is a hydrogen sealing ring with glue. The single cell 30 further includes an air sealing ring with glue, which is arranged around the third air outlet and the third air inlet of the membrane electrode assembly 34 to prevent air leakage.

[0046] As Figure 1 shown, the closed cathode air-cooled fuel cell device further includes a first insulating plate 90, a second insulating plate 100, a mounting seat 110 and a protective cover 120. The first insulating plate 90 is located between the first end plate 10 and the plurality of single cells 30. One side of the first insulating plate 90 facing the plurality of single cells 30 has a copper plating layer. The second insulating plate 100 is located between the second end plate 20 and the plurality of single cells 30. One side of the second insulating plate 100 facing the plurality of single cells 30 has a copper plating layer. The mounting seat 110 is installed on the front surface of the first end plate 10. The blower 40 is installed on the mounting seat 110. The protective cover 120 is installed on the sides of the first end plate 10 and the second end plate 20, and the protective cover 120 covers the fan 50.

[0047] In this embodiment, the first insulating plate 90 and the second insulating plate 100 are made of insulating materials. The two opposite side surfaces of the first insulating plate 90 and the second insulating plate 100 are subjected to copper deposition treatment to form copper plating layers. The two copper plating layers are respectively in contact with both sides of the stacked single cells 30 to collect the current and voltage of the air-cooled stack and output them to an external load. The protection of the stacked single cell stack is realized by setting the protective cover 120, and at the same time, it is convenient to set the blower 40, the mounting seat 110 and the fan 50. Among them, the blowing direction of the fan 50 is the same as the extending direction of the cooling air flow channel 35. The installation of the setting angle of the fan 50 and the diversion of the cooling air blown out by the fan 50 are facilitated by the protective cover 120.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A closed cathode air-cooled fuel cell device, characterized in that, It includes a first end plate (10), a second end plate (20), a plurality of single cells (30), a blower (40) and a fan (50). The plurality of single cells (30) are stacked between the first end plate (10) and the second end plate (20); each single cell (30) includes an anode flat plate (31), a cooling corrugated plate (32), a cathode graphite plate (33) and a membrane electrode assembly (34) stacked in sequence. A plurality of cooling air channels (35) are formed between the cooling corrugated plate (32) and the anode flat plate (31). A plurality of reaction air channels (331) are provided on the side of the cathode graphite plate (33) facing away from the cooling corrugated plate (32). The membrane electrode assembly (34) has a plurality of hydrogen gas flow channels (341) for hydrogen gas to flow through; the blower (40) is installed on the front of the first end plate (10), and the blower (40) supplies reaction air to the reaction air channels (331) of the single cells (30). The fan (50) is installed on the side of the first end plate (10) and the second end plate (20), and the fan (50) supplies cooling air to the cooling air channels (35) of the single cells (30); The cooling corrugated plate (32) is welded to the anode flat plate (31). The cooling corrugated plate (32) has a plurality of parallel ribs, and a region between each rib and the anode flat plate (31) forms one of the cooling air channels (35); The side of the cathode graphite plate (33) facing the anode flat plate (31) has an assembly groove (332), and the anode flat plate (31) and the cooling corrugated plate (32) are located in the assembly groove (332); The closed cathode air-cooled fuel cell device has an air input channel, an air output channel, a hydrogen input channel and a hydrogen output channel passing through the plurality of single cells (30). The air input channel and the hydrogen input channel are located on one side of the reaction air channels (331), and the air output channel and the hydrogen output channel are located on the other side of the reaction air channels (331); wherein, the outlet of the blower (40) is communicated with the air input channel, the air input channel, the reaction air channels (331) and the air output channel are communicated in sequence, and the hydrogen input channel, the hydrogen gas flow channels (341) and the hydrogen output channel are communicated in sequence; The single cell (30) further includes a first metal gasket (361) and a second metal gasket. The first metal gasket (361) is disposed around the air input flow channel. One side of the first metal gasket (361) is sealingly engaged with the membrane electrode assembly (34), and there is an input gap between the other side of the first metal gasket (361) and the cathode graphite plate (33). The air input flow channel communicates with the reaction air flow channel (331) through the input gap. The second metal gasket is disposed around the air output flow channel. One side of the second metal gasket is sealingly engaged with the membrane electrode assembly (34), and there is an output gap between the other side of the second metal gasket and the cathode graphite plate (33). The air output flow channel communicates with the reaction air flow channel (331) through the output gap. The membrane electrode assembly (34) includes an anode carbon paper (342) and a flow channel carbon paper (343), and a plurality of hydrogen gas flow channel grooves (341) are engraved on the flow channel carbon paper (343).

2. The closed cathode air-cooled fuel cell device according to claim 1, characterized in that, The cooling air flow channel (35) extends along the width direction of the anode plate (31), the reaction air flow channel (331) extends along the width direction of the anode plate (31), and the hydrogen gas flow channel grooves (341) extend along the length direction of the anode plate (31).

3. The closed cathode air-cooled fuel cell device according to claim 1, characterized in that, The single cell (30) further includes an input hydrogen gas sealing ring (374), an output hydrogen gas sealing ring, an input air sealing ring (373), and an output air sealing ring located on the cathode graphite plate (33). The input hydrogen gas sealing ring (374) is disposed around the hydrogen gas input flow channel, the output hydrogen gas sealing ring is disposed around the hydrogen gas output flow channel, the input air sealing ring (373) is disposed around the air input flow channel and is located between the cathode graphite plate (33) and the anode plate (31), and the output air sealing ring is disposed around the air output flow channel and is located between the cathode graphite plate (33) and the anode plate (31).

4. The closed cathode air-cooled fuel cell device according to claim 1, wherein The single cell (30) further includes an air outer sealing ring (371). The air outer sealing ring (371) surrounds a plurality of the reaction air flow channels (331), and the air outer sealing ring (371) is located between the cathode graphite plate (33) and the membrane electrode assembly (34).

5. The closed cathode air-cooled fuel cell device according to claim 1, characterized in that, The closed cathode air-cooled fuel cell device further includes a rubber tube (60), an air joint (70), and a hydrogen gas quick-connect fitting. The air joint (70) is installed on the front surface of the first end plate (10). The outlet of the fan (40) is connected to the air joint (70) through the rubber tube (60). The air joint (70) communicates with the air input flow channel. The hydrogen gas quick-connect fitting is installed on the front surface of the first end plate (10), and the hydrogen gas quick-connect fitting communicates with the hydrogen gas input flow channel.

6. The closed cathode air-cooled fuel cell device according to claim 1, characterized in that, The single cell (30) further includes a hydrogen outer sealing ring (372). The hydrogen outer sealing ring (372) surrounds a plurality of the hydrogen flow channels (341). The hydrogen outer sealing ring (372) is located between the anode carbon paper (342) of one single cell (30) and the anode plate (31) of an adjacent single cell (30).

7. The closed cathode air-cooled fuel cell device according to claim 1, characterized in that, The closed cathode air-cooled fuel cell device further includes a first insulating plate (90), a second insulating plate (100), a mounting seat (110), and a protective cover (120). The first insulating plate (90) is located between the first end plate (10) and a plurality of the single cells (30). One side of the first insulating plate (90) facing the plurality of the single cells (30) has a copper plating layer. The second insulating plate (100) is located between the second end plate (20) and a plurality of the single cells (30). One side of the second insulating plate (100) facing the plurality of the single cells (30) has a copper plating layer. The mounting seat (110) is mounted on the front surface of the first end plate (10). The fan (40) is mounted on the mounting seat (110). The protective cover (120) is mounted on the sides of the first end plate (10) and the second end plate (20). The protective cover (120) covers the fan (50).

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