Fuel cell stack

Abstract

The invention relates to a fuel cell stack. The fuel cell stack comprises a connecting plate, a cell main body and a heat dissipation unit, the connecting plates are stacked together, air inlet holes and air outlet holes are formed in the two ends of each connecting plate respectively, heat dissipation channels are formed in the connecting plates, the two ends of each heat dissipation channel are communicated with the air inlet holes and the air outlet holes respectively, all the air inlet holes are communicated to form an air inlet cavity, and all the air outlet holes are communicated to form an air outlet cavity. The battery main body is arranged between two adjacent connecting plates, the anode is attached to one connecting plate, and a first gas channel is formed between the anode and the connecting plate; the cathode is attached to the other connecting plate, and a second gas channel is formed between the cathode and the connecting plate. The heat dissipation unit is used for inputting an air cooling medium into the heat dissipation channel. The fuel cell stack has the characteristics of high heat dissipation efficiency, high reliability and long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power equipment, and in particular to a fuel cell stack. Background Art

[0002] Solid oxide fuel cell (SOFC), as a type of all-solid-state high-temperature fuel cell with ceramic materials as core components, has the characteristics of strong fuel adaptability, high conversion efficiency, low emission pollution and good system integration flexibility. Its electrochemical reaction mainly relies on the migration of oxygen ions in the electrolyte layer. Within the operating temperature range of 600℃-1000℃, it can directly use a variety of hydrocarbon fuels such as hydrogen, natural gas, synthesis gas, biogas, etc. for electrical energy conversion, while releasing a large amount of heat energy. Therefore, solid oxide fuel cells have shown unique application prospects in the fields of stationary power generation, distributed combined heat and power, aerospace power supply, etc.

[0003] In the related art, a fuel cell stack consists of several battery bodies and connecting plates. The battery body includes an anode and a cathode, which are respectively mounted on both sides of the connecting plate. Flow channels for hydrogen and air circulation are processed on the connecting plate, so that hydrogen flows from the anode surface and oxygen in the air flows from the cathode surface to complete the electrochemical reaction. During operation, the fuel cell stack will generate a large amount of heat energy, causing the overall structure temperature to rise. In order to achieve temperature control of the fuel cell stack, it is necessary to introduce an amount of air that exceeds the requirements of the electrochemical reaction, so as to use a large amount of air circulation to take away the heat and achieve cooling. At the same time, due to the low thermal conductivity of air (about 0.026W·m -1 K-1), requiring increased air compressor power to maintain air supply, which in turn increases the overall system's parasitic energy consumption. Furthermore, because the heat exchange area for air is primarily concentrated near the air flow path, and air flow regulation is difficult under rapidly fluctuating loads, this can lead to significant temperature fluctuations in the battery cell. Ceramic cathodes and anodes are susceptible to cracking and fatigue when subjected to large local temperature fluctuations, increasing the risk of hydrogen and air cross-contamination and explosion, reducing the reliability and service life of the fuel cell stack. Summary of the Invention

[0004] The object of the present invention is to provide a fuel cell stack with high heat dissipation efficiency, high reliability and long service life.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A fuel cell stack is provided, comprising:

[0007] A connecting plate, wherein the connecting plates are multiple and are stacked together along their thickness direction, and the connecting plates are respectively provided with an air inlet hole and an air outlet hole at both ends along their length direction, and a heat dissipation channel is provided in the connecting plate, and the two ends of the heat dissipation channel are respectively connected to the air inlet hole and the air outlet hole, all the air inlet holes are connected to form an air inlet chamber, and all the air outlet holes are connected to form an air outlet chamber;

[0008] A battery body, the battery body being disposed between two adjacent connecting plates, the battery body comprising an anode and a cathode, the anode being attached to one of the connecting plates, and forming a first gas channel for the flow of fuel gas between the anode and the corresponding connecting plate; the cathode being attached to the other connecting plate, and forming a second gas channel for the flow of air between the cathode and the corresponding connecting plate;

[0009] A heat dissipation unit is connected to the air inlet chamber and the air outlet chamber, and is used to input air-cooling medium into the heat dissipation channel.

[0010] Furthermore, the thermal conductivity of the air-cooling medium is greater than the thermal conductivity of air.

[0011] Furthermore, the air-cooling medium is at least one of hydrogen and helium.

[0012] Furthermore, there are multiple heat dissipation channels, and the multiple heat dissipation channels are distributed at intervals along the width direction of the connecting plate.

[0013] Furthermore, the connecting plate has two sides along its thickness direction, namely a first side surface and a second side surface. The first side surface is provided with a first groove. A plurality of first support bars are spaced apart in the first groove. The anode abuts against the first support bars. The first gas channel is formed between two adjacent first support bars and the anode.

[0014] The second side surface is provided with a second groove, and a plurality of second support bars are arranged at intervals in the second groove. The cathode abuts against the second support bars, and the second gas channel is formed between two adjacent second support bars and the cathode.

[0015] Furthermore, along the length direction of the connecting plate, the two ends of the first groove respectively form a first inlet gathering area and a first outlet gathering area, the first support bar is located between the first inlet gathering area and the first outlet gathering area, and the two ends of the first gas channel are respectively connected to the first inlet gathering area and the first outlet gathering area; the two ends of the second groove respectively form a second inlet gathering area and a second outlet gathering area, the second support bar is located between the second inlet gathering area and the second outlet gathering area, and the two ends of the second gas channel are respectively connected to the second inlet gathering area and the second outlet gathering area.

[0016] Furthermore, the first inlet collection area and the second outlet collection area are located at the same end in the length direction of the connecting plate, and the first outlet collection area and the second inlet collection area are located at the same end in the length direction of the connecting plate.

[0017] Furthermore, it also includes a partition, which is clamped between two adjacent connecting plates. The first inlet collection area and the second outlet collection area on the two adjacent connecting plates are separated by the partition, and the first outlet collection area and the second inlet collection area on the two adjacent connecting plates are separated by the partition.

[0018] Furthermore, the cross section of the heat dissipation channel is circular, elliptical or rectangular.

[0019] Furthermore, it also includes a glass seal, which is sandwiched between two adjacent connecting plates, and is at least provided around the air inlet and the air outlet.

[0020] The present invention has the following advantages compared to the prior art:

[0021] A fuel cell stack of the present invention dissipates heat from the connecting plate by providing a heat dissipation channel within the connecting plate and inputting an air-cooling medium through the heat dissipation channel. Since the heat dissipation channel is located within the connecting plate, it can effectively remove heat from both sides of the connecting plate. Compared with the prior art that relies on air flowing through the cathode for heat dissipation, it is beneficial to improve the heat dissipation efficiency. In addition, heat dissipation through the air-cooling medium in the heat dissipation channel can share the heat absorbed by the air in the second gas channel, thereby reducing the air flow in the second gas channel and reducing the parasitic energy consumption of the entire power generation system. At the same time, when the temperature of the fuel cell stack is abnormal, it can be adjusted simultaneously through the second gas channel and the heat dissipation channel to improve the sensitivity of the temperature control, reduce the temperature difference, and thereby reduce the risk of cracks and fatigue in the battery body, thereby improving the reliability and service life of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0023] Figure 1 This is an exploded view of a fuel cell stack according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of a connecting plate from a first perspective according to an embodiment of the present invention.

[0025] Figure 3 for Figure 2 A in the enlarged view.

[0026] Figure 4 Schematic diagram of a connecting plate from a second viewing angle according to an embodiment of the present invention.

[0027] Figure 5 for Figure 4 Enlarged view of point B in .

[0028] In the picture:

[0029] 1. Connecting plate; 11. First side; 12. Second side; 13. Air inlet; 14. Air outlet; 15. Heat dissipation channel; 16. First groove; 161. First inlet collection area; 162. First outlet collection area; 163. First gas channel; 164. Fuel gas inlet; 165. Fuel gas outlet; 17. First support bar; 18. Second groove; 181. Second inlet collection area; 182. Second outlet collection area; 183. Second gas channel; 184. Air inlet; 185. Air outlet; 19. Second support bar; 2. Battery body; 21. Anode; 22. Cathode; 23. Electrolyte. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] like Figures 1 to 5As shown, the present invention provides a fuel cell stack, comprising a connecting plate 1, a battery body 2 and a heat dissipation unit (not shown in the figure). The battery body 2 is of prior art, and its specific structure and working principle are not described in detail here. The battery body 2 comprises an anode 21, an electrolyte 23 and a cathode 22 stacked in sequence. The anode 21, the electrolyte 23 and the cathode 22 are all ceramic plate structures. The material of the electrolyte 23 can be YSZ or GDC, and its thickness is controlled to be 10-30μm. The connecting plate 1 is a metal plate, preferably made of ferritic stainless steel (such as Crofer 22APU). The connecting plate 1 is used to install and fix the battery body 2. The connecting plate 1 is a rectangular plate structure. There are multiple connecting plates 1, and the multiple connecting plates 1 are stacked together along their thickness direction (Z direction in the figure). A battery body 2 is arranged between two adjacent connecting plates 1. The anode 21 and the cathode 22 in the battery body 2 are arranged along the thickness direction of the connecting plate 1 so that the anode 21 is in contact with one of the two adjacent connecting plates 1, and the cathode 22 is in contact with the other of the two adjacent connecting plates 1. A first gas channel 163 is formed between the anode 21 and the corresponding connecting plate 1. The first gas channel 163 is connected to an external gas supply device to supply fuel gas into the first gas channel 163. The fuel gas can be hydrogen, carbon monoxide, or a mixture of hydrogen and carbon monoxide. A second gas channel 183 is formed between the cathode 22 and the corresponding connecting plate 1. The second gas channel 183 is connected to an external gas supply device to supply air into the second gas channel 183.

[0032] The connecting plate 1 is provided with an air inlet 13 and an air outlet 14. The air inlet 13 and the air outlet 14 are respectively located at the two ends of the connecting plate 1 in the length direction (X direction in the figure), and the air inlet 13 and the air outlet 14 pass through the two side surfaces of the connecting plate 1 in the thickness direction. The air inlet 13 and the air outlet 14 are long holes, and the two ends of the air inlet 13 and the air outlet 14 in the length direction are respectively close to the end positions of the connecting plate 1 in the width direction (Y direction in the figure). A heat dissipation channel 15 is provided in the connecting plate 1, and the two ends of the heat dissipation channel 15 are connected to the air inlet 13 and the air outlet 14 respectively. Since multiple connecting plates 1 are stacked together, the air inlet 13 on all the connecting plates 1 are connected in sequence, and after all the air inlet 13 are connected, an air inlet chamber is formed. In addition, all the air outlet 14 on the connecting plates 1 are connected, and after all the air outlet 14 are connected, an air outlet chamber is formed. The heat dissipation unit is used to dissipate heat from the connecting plate 1, and the heat dissipation unit includes an air pump, a gas pipeline, a gas storage device, etc. The heat dissipation unit is connected to the air inlet and outlet chambers and is used to supply cooling medium into the heat dissipation channel 15. During operation, the cooling medium is supplied to the air inlet chamber, which then flows through the heat dissipation channel 15 into the outlet chamber and is finally discharged from the outlet chamber. As the cooling medium flows through the heat dissipation channel 15, it exchanges heat with the connecting plate 1, thereby dissipating heat for the entire fuel cell stack.

[0033] It is understood that by providing a heat dissipation channel 15 within the connecting plate 1, an air-cooling medium is introduced through the heat dissipation channel 15 to dissipate heat from the connecting plate 1. Because the heat dissipation channel 15 is located within the connecting plate 1, it can effectively remove heat from both sides of the connecting plate 1. This improves heat dissipation efficiency compared to the prior art method of relying on air flowing through the cathode 22 for heat dissipation. Furthermore, heat dissipation through the air-cooling medium within the heat dissipation channel 15 can share the heat absorbed by the air in the second gas channel 183, thereby reducing the air flow within the second gas channel 183 and lowering the parasitic energy consumption of the entire power generation system. Furthermore, when the temperature of the fuel cell stack is abnormal, the second gas channel 183 and the heat dissipation channel 15 can be used to adjust the temperature simultaneously, improving the sensitivity of the temperature control and reducing the temperature difference. This, in turn, reduces the risk of cracks and fatigue in the battery body 2, thereby improving the reliability and service life of the fuel cell stack. It should be noted that the air-cooling medium can be driven by natural convection or a low-power air pump, resulting in far less parasitic energy consumption than that generated by air driving the second gas channel 183.

[0034] Specifically, the thermal conductivity of the air-cooling medium is greater than that of air. By introducing an air-cooling medium with a higher thermal conductivity into the heat dissipation channel 15, it is beneficial to improve the heat exchange efficiency, increase the heat absorption ratio of the air-cooling medium, and further reduce the heat absorption of the air in the second gas channel 183. The air-cooling medium includes at least one of hydrogen and helium. That is, the air-cooling medium can be hydrogen, helium, or a mixture of hydrogen and helium. In actual applications, the air-cooling medium can be comprehensively considered based on factors such as thermal conductivity, insulation, chemical stability, and cost. In this embodiment, as a preferred option, the air-cooling medium is hydrogen.

[0035] Specifically, there are multiple heat dissipation channels 15, and the multiple heat dissipation channels 15 are spaced apart along the width direction of the connecting plate 1. On the one hand, this structure can increase the overall heat dissipation surface of the heat dissipation channel 15 and improve the heat dissipation efficiency. On the other hand, it can also make the heat dissipation channel 15 more widely and evenly distributed on the connecting plate 1, improve the overall heat dissipation performance, and reduce local temperature differences. The cross-section of the heat dissipation channel 15 is circular, elliptical or rectangular. In practical applications, the shape of the heat dissipation channel 15 can be reasonably selected according to the difficulty of processing. In some embodiments, in order to increase the heat dissipation surface, the heat dissipation channel 15 can also be set to a spiral structure, a corrugated structure or a honeycomb porous structure to promote the heat exchange effect.

[0036] Specifically, the inner wall of the heat dissipation channel 15 is provided with a ceramic coating or a metal coating with high thermal conductivity, and the ceramic coating includes AlN and SiC. By providing the coating, it is beneficial to improve the mechanical strength of the connecting plate 1 and avoid deformation due to temperature changes during the heat exchange process. Alternatively, a buffer cavity is also provided in the heat dissipation channel 15, which can accommodate more air-cooling medium or slow down and buffer the air-cooling medium, thereby absorbing the instantaneous stress generated during the thermal fluctuation in the connecting plate 1 and improving the thermal shock toughness of the entire fuel cell stack.

[0037] Specifically, the fuel cell stack also includes a glass seal (not shown in the figure). The glass seal is sandwiched between two adjacent connecting plates 1, and a glass seal is provided at least around the air inlet 13 and the air outlet 14. The glass seal will be in a molten state at the operating temperature of the fuel cell stack to seal the connection between the two adjacent connecting plates 1. By providing a glass seal, the air inlet chamber and the air outlet chamber can be sealed to avoid cross-gas between the air-cooling medium and the fuel gas inside. Of course, in order to ensure the overall sealing performance, a glass seal can also be provided in the area on the connecting plate 1 where a sealing design is required.

[0038] Specifically, to facilitate description of the specific structure of the fuel cell stack, this embodiment uses a structure in which multiple connecting plates 1 are stacked vertically. Of two adjacent connecting plates 1, the anode 21 is bonded to the lower connecting plate 1, and the cathode 22 is bonded to the upper connecting plate 1. The two side surfaces of the connecting plates 1 along their thickness are a first side surface 11 and a second side surface 12. The first side surface 11 is located at the top of the connecting plate 1 and is used to mount the anode 21. The second side surface 12 is located at the bottom of the connecting plate 1 and is used to mount the cathode 22.

[0039] A first groove 16 is provided on the first side surface 11 and is located between the air inlet 13 and the air outlet 14. A plurality of first support bars 17 are provided within the first groove 16 and are integrally formed with the connecting plate 1. The plurality of first support bars 17 are spaced apart along the width of the connecting plate 1. The anode 21 abuts against the first support bar 17. The height of the first support bar 17 is lower than the depth of the first groove 16, allowing the anode 21 to be accommodated within the first groove 16 and placed on the first support bar 17. A first gas channel 163 is formed between two adjacent first support bars 17 and the anode 21. Along the length of the connecting plate 1, the ends of the first support bar 17 are spaced from the walls of the first groove 16, forming a gap between the ends of the first support bar 17 and the first groove 16. The gaps at the ends of the first support bar 17 are the first inlet collection area 161 and the first outlet collection area 162. It can also be understood that the two ends of the first groove 16 respectively form a first inlet collection area 161 and a first outlet collection area 162, and the first support bar 17 is located between the first inlet collection area 161 and the first outlet collection area 162. The two ends of the first gas channel 163 are connected to the first inlet collection area 161 and the first outlet collection area 162, respectively. By providing the first inlet collection area 161 and the first outlet collection area 162, the fuel gas can be collected in the first inlet collection area 161 and then enter each first gas channel 163. The fuel gas after the reaction enters the first outlet collection area 162 and then is discharged. Correspondingly, a fuel gas inlet 164 is provided in the first inlet collection area 161, and a fuel gas outlet 165 is provided in the first outlet collection area 162. The fuel gas in each first gas channel 163 can be centrally input through the fuel gas inlet 164 and centrally output through the fuel gas outlet 165, thereby simplifying the design structure of the connecting plate 1.

[0040] Similarly, a second groove 18 is provided on the second side surface 12, and the second groove 18 is located between the air inlet 13 and the air outlet 14. A plurality of second support bars 19 are provided in the second groove 18, and the second support bars 19 are integrally formed with the connecting plate 1. The plurality of second support bars 19 are spaced apart along the width of the connecting plate 1. The cathode 22 abuts against the second support bar 19. The height of the second support bar 19 is lower than the depth of the second groove 18, so that the cathode 22 can be accommodated in the second groove 18 and placed on the second support bar 19. A second gas channel 183 is formed between two adjacent second support bars 19 and the cathode 22. Along the length of the connecting plate 1, the ends of the second support bar 19 are spaced from the groove wall of the second groove 18, so that a gap area is formed between the end of the second support bar 19 and the second groove 18. The gap areas at the ends of the second support bar 19 are the second inlet convergence area 181 and the second outlet convergence area 182. It can also be understood that the two ends of the second groove 18 form a second inlet collection area 181 and a second outlet collection area 182, respectively, and the second support bar 19 is located between the second inlet collection area 181 and the second outlet collection area 182. The two ends of the second gas channel 183 are respectively connected to the second inlet collection area 181 and the second outlet collection area 182. By providing the second inlet collection area 181 and the second outlet collection area 182, the air can be collected in the second inlet collection area 181 and then enter each second gas channel 183, and the air after participating in the reaction enters the second outlet collection area 182 and is then discharged. Correspondingly, an air inlet 184 is provided in the second inlet collection area 181, and an air outlet 185 is provided in the second outlet collection area 182. The air in each second gas channel 183 can be centrally input through the air inlet 184 and centrally output through the air outlet 185, so as to simplify the design structure of the connecting plate 1.

[0041] Specifically, the first inlet convergence area 161 and the second outlet convergence area 182 are located at the same end along the length of the connecting plate 1, and the first outlet convergence area 162 and the second inlet convergence area 181 are located at the same end along the length of the connecting plate 1. In this embodiment, the first side surface 11 and the second side surface 12 of the connecting plate 1 have the same shape, and the shapes of the two side surfaces are arranged in opposite directions along the length of the connecting plate 1. This structure facilitates the processing of the first groove 16 and the second groove 18 and makes the entire connecting plate 1 more compact.

[0042] Specifically, the fuel cell stack also includes a separator (not shown in the figure), the shape of the separator is designed to match the shape of the connecting plate 1 and the first groove 16 and the second groove 18. In two adjacent connecting plates 1, the first inlet collection area 161 and the second outlet collection area 182 are opposite each other, and the first inlet collection area 161 and the second outlet collection area 182 are separated by a separator to avoid cross-contamination between the fuel gas and the air, so that the first inlet collection area 161 and the second outlet collection area 182 can form a sealed chamber. Similarly, in two adjacent connecting plates 1, the first outlet collection area 162 and the second inlet collection area 181 are opposite each other, and the first outlet collection area 162 and the second inlet collection area 181 are separated by a separator to avoid cross-contamination between the fuel gas and the air, so that the first outlet collection area 162 and the second inlet collection area 181 can form a sealed chamber. Of course, in some embodiments, the separator can be eliminated when the structure of the connecting plate 1 itself can form a sealed chamber for each collection area.

[0043] In this embodiment, the working principle of the fuel cell stack is roughly as follows: the external gas supply device inputs fuel gas into the first gas channel 163 through the fuel gas inlet 164, and the fuel gas flows through the surface of the anode 21 and undergoes an electrochemical reaction. The reacted fuel gas is discharged through the fuel gas outlet 165. The external gas supply device inputs air into the second gas channel 183 through the air inlet 184, and the air flows through the surface of the cathode 22 and undergoes an electrochemical reaction. The reacted air is discharged through the air outlet 185. In addition, the heat dissipation unit inputs air-cooling medium into the air inlet chamber, and the air-cooling medium enters each heat dissipation channel 15 and exchanges heat with the connecting plate 1. The air-cooling medium after absorbing heat enters the air outlet chamber and is discharged from the air outlet chamber in a centralized manner.

[0044] The significant effect of this embodiment is that by providing a heat dissipation channel 15 within the connecting plate 1, an air-cooling medium is input through the heat dissipation channel 15 to dissipate heat from the connecting plate 1. Since the heat dissipation channel 15 is located within the connecting plate 1, it can effectively remove heat from both sides of the connecting plate 1. Compared with the prior art that relies on air flowing through the cathode 22 to dissipate heat, it is beneficial to improve the heat dissipation efficiency. In addition, dissipating heat through the air-cooling medium in the heat dissipation channel 15 can share the heat absorbed by the air in the second gas channel 183, thereby reducing the air flow in the second gas channel 183 and reducing the parasitic energy consumption of the entire power generation system. At the same time, when the temperature of the fuel cell stack is abnormal, it can be adjusted simultaneously through the second gas channel 183 and the heat dissipation channel 15, thereby improving the sensitivity of the temperature control, reducing the temperature difference, and thus reducing the risk of cracks and fatigue in the battery body 2, thereby improving the reliability and service life of the fuel cell stack.

[0045] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A fuel cell stack, characterized in that: include: A connecting plate, wherein the connecting plates are multiple and are stacked together along their thickness direction, and the connecting plates are respectively provided with an air inlet hole and an air outlet hole at both ends along their length direction, and a heat dissipation channel is provided in the connecting plate, and the two ends of the heat dissipation channel are respectively connected to the air inlet hole and the air outlet hole, all the air inlet holes are connected to form an air inlet chamber, and all the air outlet holes are connected to form an air outlet chamber; A battery body, the battery body being disposed between two adjacent connecting plates, the battery body comprising an anode and a cathode, the anode being attached to one of the connecting plates, and forming a first gas channel for the flow of fuel gas between the anode and the corresponding connecting plate; the cathode being attached to the other connecting plate, and forming a second gas channel for the flow of air between the cathode and the corresponding connecting plate; A heat dissipation unit is connected to the air inlet chamber and the air outlet chamber, and is used to input air-cooling medium into the heat dissipation channel.

2. The fuel cell stack according to claim 1, wherein: The thermal conductivity of the air-cooling medium is greater than the thermal conductivity of air.

3. The fuel cell stack according to claim 2, characterized in that The air-cooling medium is at least one of hydrogen and helium.

4. The fuel cell stack according to claim 1, wherein: There are a plurality of heat dissipation channels, and the plurality of heat dissipation channels are distributed at intervals along the width direction of the connecting plate.

5. The fuel cell stack according to claim 1, wherein: The connecting plate has a first side surface and a second side surface along its thickness direction, the first side surface is provided with a first groove, a plurality of first support bars are arranged at intervals in the first groove, the anode abuts against the first support bars, and the first gas channel is formed between two adjacent first support bars and the anode; The second side surface is provided with a second groove, and a plurality of second support bars are arranged at intervals in the second groove. The cathode abuts against the second support bars, and the second gas channel is formed between two adjacent second support bars and the cathode.

6. The fuel cell stack according to claim 5, characterized in that Along the length direction of the connecting plate, the two ends of the first groove respectively form a first inlet gathering area and a first outlet gathering area, the first support bar is located between the first inlet gathering area and the first outlet gathering area, and the two ends of the first gas channel are respectively connected to the first inlet gathering area and the first outlet gathering area; the two ends of the second groove respectively form a second inlet gathering area and a second outlet gathering area, the second support bar is located between the second inlet gathering area and the second outlet gathering area, and the two ends of the second gas channel are respectively connected to the second inlet gathering area and the second outlet gathering area.

7. The fuel cell stack according to claim 6, characterized in that The first inlet collection area and the second outlet collection area are located at the same end in the length direction of the connecting plate, and the first outlet collection area and the second inlet collection area are located at the same end in the length direction of the connecting plate.

8. The fuel cell stack according to claim 7, characterized in that: It also includes a partition, which is clamped between two adjacent connecting plates. The first inlet collection area and the second outlet collection area on the two adjacent connecting plates are separated by the partition, and the first outlet collection area and the second inlet collection area on the two adjacent connecting plates are separated by the partition.

9. The fuel cell stack according to any one of claims 1 to 8, characterized in that: The cross section of the heat dissipation channel is circular, elliptical or rectangular.

10. The fuel cell stack according to any one of claims 1 to 8, characterized in that: It also includes a glass seal, which is sandwiched between two adjacent connecting plates. The glass seal is at least arranged around the air inlet and the air outlet.

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