Air supply type air-cooled electric pile driven by wind energy and bipolar plate

Abstract

The application discloses a wind energy driven air supply type air-cooled electric pile and bipolar plate. The electric pile comprises one or more battery units, and is assembled into a battery pile with current collecting plates and end plates. The battery unit is assembled by a bipolar plate, a membrane electrode and a sealing ring. The front end plate, the front tail plate, the upper current collecting plate, the membrane electrode, the bipolar plate, the lower current collecting plate, the rear tail plate, the lower current collecting plate and the rear end plate are sequentially connected from top to bottom. The outer side surface of the front end plate is provided with a fan blade. Hydrogen through holes are formed in the front end plate and symmetrically arranged on the front end plate. A pneumatic elbow joint is arranged on the hydrogen through hole, and a soft tube is directly and quickly inserted on the joint for hydrogen inlet and outlet. The wind-cooled electric pile provided by the application does not need external force such as a fan to provide air, can effectively utilize wind energy, presents a low pressure state on the outer ring of the electric pile in a high-speed operation process, so that air is sucked in, air self-provision is realized, and the wind-cooled electric pile has the advantages of simple structure, low energy consumption and the like.

Description

Technical Field

[0001] This invention relates to air-cooled fuel cell stacks and bipolar plates, specifically to a wind-powered air-supply type air-cooled fuel cell stack and bipolar plates. Background Technology

[0002] In recent years, with the increasing prominence of environmental pollution and energy depletion, countries around the world have been actively seeking new renewable and clean energy sources. Hydrogen fuel cells, as a power generation device that directly outputs electricity through electrochemical reactions without combustion, have attracted increasing attention due to their advantages such as high energy conversion efficiency, high efficiency, no noise, and clean zero emissions. Among them, proton exchange membrane fuel cells (PEMFCs) are particularly noteworthy because of their low operating temperature, enabling rapid start-up in low-temperature environments. Furthermore, the thin membrane electrode assembly (MEA) within the cell allows for a very compact structure, resulting in high power density and a wide range of applications, making them widely used in transportation, mobile equipment, and combined heat and power (CHP) systems.

[0003] For successful adoption of fuel cell-based powertrains, a simple and reliable fuel cell system is required. Open-cathode fuel cells are such a system, offering a simple configuration where ambient air is used directly for cooling and as an oxidant, eliminating the need for a complex air supply subsystem, minimizing parasitic loads, and reducing the overall system cost. A major challenge with open-cathode structures is the strong dependence of the fuel cell stack performance on environmental conditions.

[0004] Traditional open-cathode air-cooled fuel cell stacks often use bipolar plates in a conventional elongated shape. This structure is simple and easy to manufacture, with air intake primarily in an axial parallel direction, but the air distribution effect is poor. To solve this problem, the bipolar plate is designed as a ring, and the fan is placed at the center of the ring, using an axial flow fan to achieve reverse air intake, thus solving problems such as uneven airflow distribution and uneven heat dissipation. However, both of these methods still require the use of fans to achieve cathode air supply and heat dissipation. Summary of the Invention

[0005] Most existing open-cathode air-cooled fuel cells rely on external forces such as fans to supply air (oxygen). To minimize parasitic loads and reduce overall system costs, this invention provides a wind-powered, air-supply-based air-cooled fuel cell stack and bipolar plates. The air-cooled stack model provided by this invention uses a self-driving module, enabling it to generate its own electricity using wind power, offering advantages such as simplicity, reliability, and low energy consumption.

[0006] Air-cooled fuel cell stacks are highly dependent on environmental conditions, and the uniformity of airflow and heat dissipation is strongly correlated with the placement, distance, and air intake method of the fan. The air-cooled stack provided by this invention does not require external forces such as fans to supply air; it effectively utilizes wind energy, creating a low-pressure environment around the stack during high-speed operation to draw in air, achieving self-sufficiency. This results in advantages such as simple structure and low energy consumption. The air-cooled stack structure of this invention achieves efficient heat dissipation, reduces the power required by other auxiliary components outside the stack, effectively improves the power generation efficiency of the fuel cell stack, and ensures the safe and stable operation of the fuel cell, thereby solving the problems of large core heat dissipation and uneven temperature distribution during fuel cell stack operation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A wind-powered, air-supply, air-cooled fuel cell stack includes one or more battery cells, assembled with current collectors and end plates to form a fuel cell stack. Each battery cell is assembled from bipolar plates, membrane electrodes, and sealing rings. Specifically, it includes fan blades, pneumatic bend connectors, a front end plate, an upper current collector, a membrane electrode, bipolar plates, a lower current collector, a rear end plate, a front tail plate, and a rear tail plate. The front end plate, front tail plate, upper current collector, membrane electrode, bipolar plates, lower current collector, rear tail plate, lower current collector, and rear end plate are connected in a top-to-bottom order. Fan blades are mounted on the outer surface of the front end plate. Hydrogen gas passages are symmetrically arranged on the front end plate. Pneumatic bend connectors are installed on the hydrogen gas passages, allowing for direct insertion of flexible hoses for hydrogen gas inlet and outlet.

[0009] Furthermore, the fan blades, as the core of the drive module, effectively utilize wind energy to drive the entire toroidal fuel cell stack to rotate at high speed. The outer ring of the fuel cell stack is in a low-pressure state, and the strong pressure difference will draw air into the cathode channel along the tangential direction of the toroidal fuel cell stack. The water and excess heat generated by the reaction in the cathode channel will be carried out by the external air and discharged through the innermost side of the ring. The front end plate is provided with two symmetrical through holes, which are connected to the hydrogen inlet and outlet pipes through a bent pneumatic connector.

[0010] Furthermore, the aforementioned grounding stack front-end plate is made of PPS+40%GF material, which on the one hand achieves lightweighting and effectively avoids ion precipitation; on the other hand, it can provide insulation, eliminating the need for an insulation board component.

[0011] Furthermore, the wind-powered air-supply type wind-cooled fuel cell stack has an overall ring-shaped structure.

[0012] Furthermore, the bottom surface of the front end plate is provided with an upper manifold mounting groove, and the hydrogen through hole extends into the upper manifold mounting groove; the hydrogen through hole has a shape that is larger at the top and smaller at the bottom.

[0013] Furthermore, a sealing ring is provided between the front end plate, the upper collector plate, and the front tail plate.

[0014] Furthermore, one side of the front tail plate has a sealing groove and a sealing ring installed, mainly to prevent hydrogen from leaking between the vent hole of the front end plate and the front tail plate; the rear tail plate does not have a hydrogen vent hole.

[0015] Furthermore, the membrane electrode is formed by hot-pressing a proton exchange membrane, a catalyst, and a gas diffusion layer together.

[0016] Furthermore, in this invention, the current collector is divided into an upper current collector and a lower current collector; the upper current collector is located between the front end plate and the front tail plate, and the lower current collector is located between the rear end plate and the rear tail plate; one or more battery cells are disposed between the front end plate and the rear end plate, and the front and rear end plates as well as the upper and lower current collectors are all annular structures with a hollowed-out structure in the center to facilitate drainage of the battery stack; an air-proof structure is made at the hydrogen inlet and outlet positions of the upper current collector, and a sealing ring is provided to prevent hydrogen leakage or hydrogen-oxygen exchange.

[0017] A bipolar plate for use in a wind-powered air-supply wind-cooled fuel cell stack is described. The bipolar plate is annular in shape, with one side being the anode surface and the other side being the cathode surface. The anode flow field on the anode surface has a symmetrical semi-circular structure, with the flow channels distributed from the center outwards. Hydrogen flows in through hydrogen through holes and is distributed by a long strip distribution area in the center, finally flowing out through the vent holes of the centrally symmetrical hydrogen outlet. The air flow field on the cathode surface has an air flow channel that diffuses outwards from the inner ring. Air flows into the fuel cell stack tangentially from the outer ring, reacts with hydrogen, and is discharged as product water and excess heat through the inner ring outlet.

[0018] In the above bipolar plate, the airflow channel of the cathode flow field has a fan-shaped structure or a spiral structure.

[0019] In the aforementioned bipolar plate, the hydrogen flow channel on the anode side is one or a combination of several of the following: serpentine multi-channel, mixed serpentine channel, straight-through channel, or cross-shaped channel. The air flow channel on the cathode side is a fan-shaped straight-through channel, radially distributed outward from the center of the ring to form a circumferential array. External air is passively drawn into the air flow channel from the periphery of the ring. The cathode flow channel can have a straight strip shape, a vortex shape, or one or a combination thereof. A sealing ring is disposed between the bipolar plate and the membrane electrode assembly, tightly fitting the bipolar plate and the membrane electrode to isolate gas and moisture leakage, prevent hydrogen leakage, and prevent hydrogen-oxygen exchange. An anode sealing groove is provided on the anode surface; the anode sealing groove surrounds the hydrogen through-hole and the hydrogen flow channel; a sealing ring is provided inside the anode sealing groove, which is tightly fitted to the anode surface of the bipolar plate and the membrane electrode assembly to prevent hydrogen leakage or hydrogen-oxygen exchange; each anode side has two sealing grooves, located at the inner and outer ring edges of the anode surface, respectively, corresponding to the inner ring sealing groove and the outer ring sealing groove; the sealing groove is used to place a matching sealing ring to prevent hydrogen leakage or hydrogen-oxygen exchange; a cathode sealing groove is also provided on the cathode surface; the cathode sealing groove surrounds the hydrogen through-hole to prevent hydrogen leakage or hydrogen-oxygen exchange.

[0020] In the above-mentioned bipolar plate, an annular sealing groove for the hydrogen passage on the cathode surface is provided at the upper hydrogen passage. A sealing ring for the hydrogen passage on the cathode surface is installed on the sealing groove for the hydrogen passage on the cathode surface, mainly to prevent hydrogen from leaking into the air field from this point.

[0021] In the aforementioned bipolar plate, an outer ring sealing groove and an inner ring sealing groove are respectively provided on the outer and inner rings of the anode surface; an outer ring sealing groove and an inner ring sealing groove are respectively provided on the outer and inner rings of the cathode surface; wherein the outer ring sealing groove of the anode surface and the outer ring sealing groove of the cathode surface coincide in the vertical direction; the inner ring sealing groove of the anode surface and the inner ring sealing groove of the cathode surface also coincide in the vertical direction; the bipolar plate outer ring sealing rings are respectively installed in the outer ring sealing grooves of the anode surface and the outer ring sealing grooves of the cathode surface, and the bipolar plate inner ring sealing rings are respectively installed in the inner ring sealing grooves of the anode surface and the inner ring sealing grooves of the cathode surface. It is worth noting that the sealing rings here can be standard parts or formed by adhesive application.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] (1) By installing a wind-driven module on the front end plate, wind energy can be used to drive the fuel cell stack to operate at high speed, thereby forming an equal pressure difference and equal potential in the outer ring of the fuel cell stack. Air can be uniformly drawn into the flow channel along the tangential direction of the outer ring of the stack. The circular air inlet arrangement structure combined with the intake method can effectively avoid the problems of uneven air distribution and poor heat dissipation in traditional long and narrow flow channels.

[0024] (2) Compared with the annular shaft-suction cathode open-type wind-cooled reactor, the present invention does not require an additional fan to provide air and heat dissipation, making the entire reactor structure simpler, minimizing parasitic loads and reducing the overall system cost. Among them, the wind power drive module (fan blade) in the reactor can generate its own electricity with the help of wind power, which has the advantages of simplicity, reliability and low energy consumption. Attached Figure Description

[0025] Figure 1a This is a 3D diagram of a wind-powered air-cooled fuel cell stack according to an embodiment of the present invention.

[0026] Figure 1b This is a side view of a wind-powered air-cooled fuel cell stack according to an embodiment of the present invention.

[0027] Figure 1c This is a cross-sectional view of a wind-powered air-cooled fuel cell stack according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the front-end board.

[0029] Figure 3 A schematic diagram showing the assembly of the front end plate, manifold, sealing ring, and front and rear end plates.

[0030] Figure 4 This is a schematic diagram of the bipolar plates and sealing structure of an air-cooled fuel cell stack.

[0031] Figure 5 This is a detailed diagram of the flow field at the anode of the bipolar plate.

[0032] Figure 6 This is a detailed diagram of the flow field at the cathode of the bipolar plate.

[0033] Figure 7 This is a schematic diagram of other possible cathode flow paths for a bipolar plate.

[0034] Explanation of reference numerals in the attached drawings: 1-Fan blade; 2-Bolt; 3-Pneumatic elbow connector; 4-Front end plate; 5-Upper collector plate; 6-Membrane electrode; 7-Bipolar plate; 8-Lower collector plate; 9-Rear end plate; 10-Front and rear end plates; 11-Rear end plate; 12-Hydrogen through hole; 13-Front and rear end plate sealing ring; 14-Front and rear end plate sealing groove; 15-Sealing ring at hydrogen through hole on cathode surface; 16-Sealing groove at hydrogen through hole on cathode surface; 17-Bipolar plate outer ring sealing ring; 18-Bipolar plate inner ring sealing ring; 19-Anode surface outer ring sealing groove; 20-Anode surface inner ring sealing groove; 21-Cathode surface outer ring sealing groove; 22-Cathode surface inner ring sealing groove. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0036] Example 1

[0037] A wind-powered, air-supply, air-cooled fuel cell stack includes one or more battery cells. The battery cells are assembled with current collectors and end plates to form a fuel cell stack. The battery cells are assembled from bipolar plates, membrane electrodes, and sealing rings.

[0038] In this embodiment, the current collectors are divided into an upper current collector 5 and a lower current collector 8, which serve to collect the current of the fuel cell stack. The end plates include a front end plate 4 and a rear end plate 9. The tail plates are divided into a front tail plate 10 and a rear tail plate 11. One side of the front tail plate has two sealing grooves 14 and a sealing ring 13 installed, mainly to prevent hydrogen from leaking from the vent hole of the front end plate and the front tail plate. The rear tail plate does not have a hydrogen vent hole. The upper current collector 5 is located between the front end plate 4 and the front tail plate, and the lower current collector 8 is located between the rear end plate 9 and the rear tail plate 11. The battery unit is set between the front end plate 4 and the rear end plate 9. The front and rear end plates as well as the upper and lower current collectors are all circular structures with a hollowed-out structure in the center to facilitate drainage of the fuel cell stack. An air-proof structure is made at the hydrogen inlet and outlet positions of the upper current collector, and a sealing ring is installed to prevent hydrogen leakage or hydrogen-oxygen exchange.

[0039] Specific examples Figures 1a-1c As shown, in this embodiment, the wind-powered air-cooled fuel cell stack has an overall annular structure, including a fan blade 1, a pneumatic bend connector 3, a front end plate 4, an upper current collector plate 5, a membrane electrode 6, a bipolar plate 7, a lower current collector plate 8, a rear end plate 9, a front tail plate 10, and a rear tail plate 11; the front end plate 4, front tail plate 10, upper current collector plate 5, membrane electrode 6, bipolar plate 7, lower current collector plate 8, rear tail plate 11, lower current collector plate 8, and rear end plate 9 are connected in a top-to-bottom order; the fan blade 1 is mounted on the outer surface of the front end plate 4; as... Figure 2 As shown, a hydrogen through-hole 12 is provided on the front end plate 4, extending into the mounting groove of the upper manifold 5. This serves two purposes: firstly, to prevent ion precipitation due to contact between hydrogen and the upper manifold, and secondly, to seal the hydrogen at the contact surface between the front end plate and the manifold. In this embodiment, an upper manifold mounting groove is provided on the lower bottom surface of the front end plate 4, and the hydrogen through-hole 12 extends into the upper manifold mounting groove; the hydrogen through-hole 12 has a shape that is larger at the top and smaller at the bottom. A pneumatic elbow connector is installed on the hydrogen through-hole 12, and a quick-connect hose can be directly inserted into the connector for the introduction and discharge of hydrogen.

[0040] In this embodiment, the fan blades serve as the core of the drive module, effectively utilizing wind energy to drive the entire toroidal fuel cell stack to rotate at high speed. A low-pressure state exists on the outer ring of the stack, and the strong pressure difference draws air tangentially into the cathode channel. Water and excess heat generated by the cathode channel reaction are carried away by external air and discharged through the innermost part of the ring. Two symmetrical through-holes are provided on the front end plate, connected to the hydrogen inlet and outlet pipes via a bent pneumatic connector. In this embodiment, the fan blade 1 resembles a windmill structure used in wind power generation, utilizing wind power to drive the windmill blades to rotate. In this embodiment, wind energy is also captured by fan blade 1. When the wind energy drives the wind-cooled reactor to rotate at high speed, a low-pressure area is formed in the outer ring of the reactor. The strong pressure difference causes air to be drawn into the air channel. At the same time, since the outer ring of the reactor is a circular structure and the air channel is formed by a circular array, it has high symmetry and uniformity, which makes a circular equipotential velocity difference formed in the outer ring of the reactor. As a result, due to the pressure difference of the equipotential surfaces, the air can be uniformly drawn into the air channel along the tangential direction of the outermost ring of the reactor. The water and excess heat generated by the reaction are also carried by the external air and discharged from the outlet of the inner ring air channel.

[0041] like Figure 3 As shown, in this embodiment, a sealing ring 13 is provided between the front end plate 4, the upper collector plate 5, and the front tail plate 10. One side of the front tail plate 10 has a front tail plate sealing groove 14, and the sealing ring 13 is installed thereon. This is mainly to prevent hydrogen from leaking between the vent hole of the front end plate and the front tail plate. The rear tail plate does not have a hydrogen vent hole. When hydrogen enters the stack from the hydrogen inlet along the vent hole of the front end plate to the front tail plate, there is a possibility of hydrogen leakage at the contact surface between the front end plate and the front tail plate. Therefore, a front tail plate sealing groove 14 is provided on the smooth plate on the back of the front tail plate to seal the hydrogen vent hole to the front tail plate and prevent hydrogen leakage. The sealing ring here can be die-cut or a standard part, or it can be formed directly by applying adhesive to the front tail plate. However, it is worth noting that the hardness of the sealing ring should not exceed A35, otherwise there is a risk of electrode plate breakage after locking.

[0042] In this embodiment, the membrane electrode 6 is formed by hot-pressing and bonding a proton exchange membrane, a catalyst, and a gas diffusion layer. The proton exchange membrane of the membrane electrode assembly is a membrane obtained by coating and high-temperature drying with an organic solvent containing a perfluorosulfonic acid polymer, serving to transport protons generated during the fuel cell reaction. The catalyst layer of the membrane electrode assembly is where the electrochemical reaction of the fuel cell occurs. The catalyst layer is obtained by coating a polytetrafluoroethylene film with a catalyst slurry containing platinum-loaded carbon powder particles on its surface. The catalyst is platinum-loaded carbon powder particles. The gas diffusion layer serves to transport reactant gases and water, and provides mechanical support for the membrane electrode assembly. It is obtained by soaking carbon fiber cloth in a hydrophobic material PTFE, drying, and sintering.

[0043] In this embodiment, the upper current collector 5 and the lower current collector 8 have the same structural outline, but the upper current collector has a clearance position in the hydrogen through hole; the two current collectors are made of the same material, both being smooth gold-plated copper plates. It is worth noting that both the front and rear end plates are made of PPS+40%GF material, which has high temperature and high pressure resistance and insulation properties, so no insulating plate is required in the entire fuel cell stack assembly.

[0044] In this embodiment, the entire fuel cell stack is composed of the above components and is locked by four bolts 2, as shown in Figure 1. It is worth noting that the stack positioning can be achieved by inserting a cylinder with the same diameter as the inner diameter of the ring into the center of the ring.

[0045] Example 2

[0046] like Figure 4 As shown, the bipolar plate 7 in this embodiment is annular in shape, with one side being the anode surface and the other side being the cathode surface. Hydrogen and air flow in opposite directions. The anode flow field on the anode surface is a symmetrical semi-circular structure, with the flow channel distributed outward from the center. Hydrogen flows in through the hydrogen through hole and is distributed by the long strip distribution area in the center. Finally, it flows out through the vent hole of the centrally symmetrical hydrogen outlet.

[0047] like Figure 6 and Figure 7 As shown, the airflow channel of the cathode flow field on the cathode surface exhibits a structure that diffuses outward from the inner ring. Air flows into the fuel cell stack tangentially from the outer ring, reacts with hydrogen, and is discharged as product water and excess heat through the inner ring outlet. In this embodiment, the airflow channel of the cathode flow field has a fan-shaped structure (structure as shown). Figure 6 (as shown) or a spiral structure (structure as shown) Figure 7 As shown). By Figure 6 It can be seen that the airflow channel in the cathode flow field exhibits a fan-shaped structure and also a centrosymmetric structure. Air flows into the fuel cell stack tangentially from the outer ring, reacts with hydrogen, and is discharged as product water and excess heat through the inner ring outlet. Sealing grooves are provided in both the inner and outer rings of the cathode flow field, and a sealing groove is also provided at the hydrogen through-hole. Figure 7 As shown, the airflow channel of the cathode field can also be a spiral structure, compared to Figure 6 The airflow channel structure can reduce the flow resistance of air along the circular tangential direction. It is worth noting that the anorectal flow fields of this bipolar plate can be of the same structure or can be set as a combination of different structures, provided that it is feasible.

[0048] The cathode surface has an annular hydrogen passage sealing groove 16 at the upper hydrogen passage, and a cathode surface hydrogen passage sealing ring 15 is installed on the hydrogen passage sealing groove 16, mainly to prevent hydrogen from leaking into the air field. The outer and inner rings of the anode surface are respectively provided with an outer ring sealing groove 19 and an inner ring sealing groove 20; the outer and inner rings of the cathode surface are respectively provided with an outer ring sealing groove 21 and an inner ring sealing groove 22; wherein the outer ring sealing groove 19 of the anode surface and the outer ring sealing groove 21 of the cathode surface coincide in the vertical contour; the inner ring sealing groove 20 of the anode surface and the inner ring sealing groove 22 of the cathode surface also coincide in the vertical contour; the bipolar plate outer ring sealing ring 17 is installed in the outer ring sealing groove 19 of the anode surface and the outer ring sealing groove 21 of the cathode surface, and the bipolar plate inner ring sealing ring 18 is installed in the inner ring sealing groove 20 of the anode surface and the inner ring sealing groove 22 of the cathode surface. It is worth noting that the sealing ring here can be a standard part, cut by die-cutting or made by dispensing, but the hardness of the sealing ring must not exceed A35, otherwise there is a risk of the electrode plate breaking after locking.

[0049] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A wind-powered, air-supply, wind-cooled fuel cell stack, characterized in that, The device includes one or more battery cells, which are assembled with current collectors and end plates to form a battery stack. Each battery cell is composed of a bipolar plate, a membrane electrode assembly (MEA), and a sealing ring. The current collector is divided into an upper current collector and a lower current collector. The end plates include a front end plate and a rear end plate. The tail end plate is divided into a front tail end plate and a rear tail end plate. The front end plate, front tail end plate, upper current collector, MEA, bipolar plate, lower current collector, rear tail end plate, and rear end end plate are connected in a top-to-bottom order, with the upper current collector located between the front end plate and the front tail end plate, and the lower current collector located between the rear end plate and the rear tail end plate. The battery cells are positioned between the front end plate and the rear end plate. The front and rear end plates, as well as the upper and lower current collectors, are all annular structures with a central hollow structure to facilitate drainage of the stack. Fan blades are installed on the outer surface of the front end plate. A hydrogen gas passage is provided on the front end plate. A pneumatic elbow connector is installed on the hydrogen gas passage, allowing for the direct insertion of a flexible hose for hydrogen gas inlet and outlet. The wind-powered air-supply wind-cooled fuel cell stack has an overall ring-shaped structure. The bottom surface of the front end plate is provided with an upper manifold mounting groove, and the hydrogen gas passage extends into the upper manifold mounting groove; the hydrogen gas passage has a shape that is larger at the top and smaller at the bottom. One side of the front tailplate has a sealing groove and a sealing ring installed to prevent hydrogen from leaking between the vent hole of the front end plate and the front tailplate; the rear tailplate does not have a hydrogen vent hole.

2. The wind-powered air-supply type wind-cooled fuel cell stack as described in claim 1, characterized in that, A sealing ring is provided between the front end plate, the upper collector plate and the front tail plate.

3. The wind-powered air-supply wind-cooled fuel cell stack as described in claim 1, characterized in that, The membrane electrode is formed by hot-pressing a proton exchange membrane, a catalyst, and a gas diffusion layer together.

4. A bipolar plate used in a wind-powered, air-supply, wind-cooled fuel cell stack according to any one of claims 1 to 3, characterized in that, The bipolar plate is annular in shape, with one side being the anode surface and the other side being the cathode surface. The anode flow field on the anode surface has a symmetrical semi-circular structure, with the flow channels distributed from the center outwards. Hydrogen flows in through the hydrogen through-holes and is distributed by the long strip distribution area in the center, finally flowing out through the vent holes of the centrally symmetrical hydrogen outlet. The air flow field on the cathode surface has a structure that diffuses and extends from the inner ring outwards. Air flows into the stack tangentially from the outer ring of the stack, reacts with the hydrogen, and is discharged from the inner ring outlet, where product water and excess heat are carried away.

5. The bipolar plate as described in claim 4, characterized in that, The airflow channel of the cathode flow field has a fan-shaped structure or a spiral structure.

6. The bipolar plate as described in claim 4, characterized in that, The upper hydrogen passage of the cathode surface is provided with an annular sealing groove for the hydrogen passage of the cathode surface, and a sealing ring for the hydrogen passage of the cathode surface is installed on the sealing groove for the hydrogen passage of the cathode surface.

7. The bipolar plate as described in claim 4, characterized in that, The outer and inner rings of the anode surface are respectively provided with an outer ring sealing groove and an inner ring sealing groove; the outer and inner rings of the cathode surface are respectively provided with an outer ring sealing groove and an inner ring sealing groove; wherein the outer ring sealing groove of the anode surface and the outer ring sealing groove of the cathode surface coincide in the vertical direction; the inner ring sealing groove of the anode surface and the inner ring sealing groove of the cathode surface also coincide in the vertical direction; the bipolar plate outer ring sealing rings are respectively installed in the outer ring sealing groove of the anode surface and the outer ring sealing groove of the cathode surface, and the bipolar plate inner ring sealing rings are respectively installed in the inner ring sealing groove of the anode surface and the inner ring sealing groove of the cathode surface.

Images