Wind energy driven air supply type air-cooled electric pile and bipolar plate

Abstract

The invention discloses a wind energy driven air supply type air-cooled electric pile and a bipolar plate. The electric pile comprises one or more battery units, the battery units, collector plates and end plates are assembled to form the battery electric pile, and each battery unit is formed by assembling a bipolar plate, a membrane electrode and a sealing ring. The front end plate, the front tail plate, the upper collector plate, the membrane electrode, the bipolar plate, the lower collector plate, the rear tail plate, the lower collector plate and the rear end plate are sequentially connected from top to bottom; fan blades are mounted on the outer side surface of the front end plate; hydrogen through holes are formed in the front end plate, and the hydrogen through holes are symmetrically formed in the front end plate; a pneumatic elbow joint is mounted on the hydrogen through hole, and a hose can be directly and quickly inserted into the joint for introducing and discharging hydrogen. The air-cooled reactor provided by the invention does not need external force such as a fan to provide air, can effectively use wind energy to present a low-voltage state on the outer ring of the electric pile in a high-speed running process, so that air is sucked in, air self-sufficiency is realized, and the air-cooled reactor has the advantages of simple structure, low energy consumption and the like.

Description

Technical Field

[0002] The invention relates to an air-cooled electric stack and a bipolar plate, and in particular to a wind-powered air-supplied electric stack and a bipolar plate. Background Art

[0003] In recent years, with the increasing prominence of environmental pollution and energy depletion, countries around the world are actively looking for new renewable clean energy. Hydrogen fuel cells, as a power generation device that directly outputs electricity through electrochemical reactions without combustion, have the advantages of high energy conversion rate, high efficiency, no noise, and clean zero emissions, and are increasingly attracting people's attention. Among them, proton exchange membrane fuel cells (PEMFC) can start quickly in low temperature environments due to their low operating temperature. At the same time, the battery cell-membrane electrode assembly (MEA) inside the battery can be very thin, making the battery have a very compact structure, with high power density and a wide range of applications. It is widely used in transportation, mobile equipment, and cogeneration systems.

[0004] For the successful adoption of fuel cell based powertrains, a simple and reliable fuel cell system is required. An open cathode fuel cell is one such system that offers a simple configuration where the surrounding air is used directly to provide cooling and as an oxidant, eliminating the need for a complex air supply subsystem, minimizing parasitic loads and reducing the overall cost of the system. The main challenge of the open cathode architecture is the strong dependence of the stack performance on the ambient conditions.

[0005] The bipolar plates of traditional cathode open air-cooled fuel cell stacks are usually in the shape of regular long strips. This structure is simple and easy to process. The air inlet direction is mainly parallel to the axis, but the air distribution effect is not good. In order to solve this problem, the bipolar plate is designed to be ring-shaped, and the fan is placed in the center of the ring. An axial flow fan is used to achieve reverse air intake to solve the problems of uneven airflow distribution and uneven heat dissipation. However, both of the above two methods require the use of fans to achieve cathode air supply and heat dissipation. Summary of the invention

[0006] Most of the existing cathode open air-cooled fuel cells need to rely on external forces such as fans to provide air (oxygen). In order to minimize parasitic loads and reduce the overall cost of the system. The present invention provides a wind-driven air-supplied air-cooled fuel cell stack and bipolar plate. The air-cooled stack model provided by the present invention adopts a self-driving module, which can achieve self-generation with the help of wind energy, and has the advantages of simplicity, reliability, low energy consumption, etc.

[0007] Air-cooled fuel cell stacks are highly dependent on environmental conditions, and the uniformity of their air and heat dissipation is strongly correlated with the placement, distance, and air intake method of the fan. The air-cooled stack provided by the present invention does not require external forces such as fans to provide air, and can effectively use wind energy. During high-speed operation, the outer ring of the stack is in a low-pressure state, thereby sucking in air to achieve air self-sufficiency, and has the advantages of simple structure and low energy consumption. The air-cooled stack structure of the present invention can dissipate heat efficiently, reduce the power required for other auxiliary components outside the stack, effectively improve the power generation efficiency of the fuel cell stack, and ensure the safe and stable operation of the fuel cell, thereby solving the problem of large core heat dissipation and uneven heat dissipation temperature during the operation of the fuel cell stack.

[0008] In order to achieve the above object, the present invention adopts the following technical scheme: A wind-driven air-supply air-cooled stack includes one or more battery cells, which are assembled with current collectors and end plates into a battery stack. The battery cells are assembled from bipolar plates, membrane electrodes, and sealing rings. Specifically, it includes fan blades, pneumatic elbow joints, front end plates, upper current collectors, membrane electrodes, bipolar plates, lower current collectors, rear end plates, front tail plates, and rear tail plates; the front end plates, front tail plates, upper current collectors, membrane electrodes, bipolar plates, lower current collectors, rear tail plates, lower current collectors, and rear end plates are connected in order from top to bottom; fan blades are installed on the outer surface of the front end plates; hydrogen through holes are opened on the front end plates, and the hydrogen through holes are symmetrically arranged on the front end plates; pneumatic elbow joints are installed on the hydrogen through holes, and a quick-insert hose can be directly connected to the joints for the introduction and discharge of hydrogen.

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

[0010] Furthermore, the front end plate of the above-mentioned geoelectric stack is made of PPS+40% GF material, which, on the one hand, achieves lightweight and effectively avoids ion precipitation; on the other hand, it can have an insulating effect and eliminate the insulating plate component.

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

[0012] Furthermore, an upper collector plate mounting groove is provided on the lower bottom surface of the front end plate, and the hydrogen through hole extends into the upper collector plate mounting groove; the hydrogen through hole is in a shape of being larger at the top and smaller at the bottom.

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

[0014] Furthermore, one side of the front tail plate is provided with a sealing groove and a sealing ring, 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.

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

[0016] Furthermore, the current collecting plate in the present invention is divided into an upper current collecting plate and a lower current collecting plate; the upper current collecting plate is located between the front end plate and the front tail plate, and the lower current collecting plate is located between the rear end plate and the rear tail plate; the one or more battery cells are arranged between the front end plate and the rear end plate, and the front and rear end plates and the upper and lower current collecting plates are all circular structures, and the central hollow structure is convenient for drainage of the battery stack; a gap avoidance structure is made at the upper current collecting plate corresponding to the hydrogen inlet and outlet positions, and a sealing ring is provided to prevent hydrogen leakage or hydrogen and oxygen from communicating with each other.

[0017] A bipolar plate used in a wind-powered air-supplied air-cooled fuel cell stack, the bipolar plate is in the shape of a ring, one side of which is an anode side and the other side is a cathode side; the anode flow field on the anode side is a symmetrical semicircular structure, and the flow channels are distributed from the center to the outer ring; hydrogen flows in along the hydrogen through holes and is distributed by the long strip distribution area in the center, and finally flows out from the vent holes of the centrally symmetrical hydrogen outlet; the air flow channels of the cathode flow field on the cathode side present a structure that diffuses and extends from the inner ring to the outside, and air flows into the fuel cell stack in the tangential direction of the outer ring of the fuel cell stack, reacts with hydrogen, and discharges product water and takes away excess heat from the inner ring outlet.

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

[0019] In the above bipolar plate, the hydrogen flow channel on the anode surface is one or a combination of serpentine multi-flow channels, mixed serpentine flow channels, straight-through flow channels or cross-cross flow channels; the air flow channel on the cathode surface is a fan-shaped straight-through flow channel, and is radially distributed from the center of the ring to the outside to form a circular array, and the external air is passively sucked into the air flow channel from the surrounding of the ring, wherein the structure of the cathode flow channel can be one or a combination of straight strips, vortexes, etc. The sealing ring is arranged between the bipolar plate and the membrane electrode assembly, and is tightly fitted with the bipolar plate and the membrane electrode to isolate the leakage of gas and moisture, prevent hydrogen leakage, and prevent hydrogen and oxygen from communicating with each other. An anode sealing groove is arranged on the anode surface; the anode sealing groove surrounds the hydrogen through hole and the hydrogen flow channel; a sealing ring is arranged in the anode sealing groove, which is tightly fitted with the anode surface of the bipolar plate and the membrane electrode assembly to prevent hydrogen leakage or the communication between hydrogen and oxygen; each anode side sealing groove has two, which are respectively located at the inner ring edge and the outer ring edge of the anode surface, 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 the communication between hydrogen and oxygen; the cathode surface is also provided with a cathode sealing groove; the cathode sealing groove surrounds the hydrogen through hole therein to prevent hydrogen leakage or the communication between hydrogen and oxygen.

[0020] In the above-mentioned bipolar plate, a circular cathode surface hydrogen through hole sealing groove is provided at the upper hydrogen through hole of the cathode surface, and a cathode surface hydrogen through hole sealing ring is installed on the cathode surface hydrogen through hole sealing groove, mainly to prevent hydrogen from leaking from here to the air field.

[0021] In the above bipolar plate, the outer ring and inner ring of the anode surface are respectively provided with an outer ring sealing groove of the anode surface and an inner ring sealing groove of the anode surface; the outer ring and inner ring of the cathode surface are respectively provided with an outer ring sealing groove of the cathode surface and an inner ring sealing groove of the cathode surface; wherein the outer ring sealing groove of the anode surface and the outer ring sealing groove of the cathode surface have the same contour in the vertical direction; the inner ring sealing groove of the anode surface and the inner ring sealing groove of the cathode surface also have the same contour in the vertical direction; the outer ring sealing ring of the bipolar plate is respectively installed in the outer ring sealing groove of the anode surface and the outer ring sealing groove of the cathode surface, and the inner ring sealing ring of the bipolar plate is respectively installed in the inner ring sealing groove of the anode surface and the inner ring sealing groove of the cathode surface. It is worth noting that the sealing ring here can be a standard part or made by dispensing glue.

[0022] Compared with the prior art, the advantages of the present invention are: (1) By installing a wind energy drive module on the front end panel, wind energy can be used to drive the stack to run at high speed, thereby forming equal differential equipotential pressure on the outer ring of the stack, and air can be evenly sucked into the flow channel along the tangential direction of the outer ring of the stack. The circular air inlet arrangement structure combined with the suction-type air intake method can effectively avoid the problems of uneven air distribution and poor heat dissipation in traditional long strip flow channels.

[0023] (2) Compared with the annular axial suction cathode open air-cooled reactor, the present invention does not need to add an additional fan to provide air and heat dissipation, making the entire stack structure simpler, minimizing the parasitic load and reducing the overall cost of the system. Among them, the wind energy drive module (fan blades) in the stack can achieve self-generation with the help of wind energy, which has the advantages of simplicity, reliability, and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1a This is a 3D diagram of a wind-powered air-supply air-cooled fuel cell stack according to an embodiment of the present invention.

[0025] Figure 1b A side view of a wind-driven air supply air-cooled fuel cell stack according to an embodiment of the present invention.

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

[0027] Figure 2 This is a schematic diagram of the front end panel.

[0028] Figure 3 Schematic diagram of the assembly of the front end plate, collecting plate, sealing ring and front tail plate.

[0029] Figure 4 Schematic diagram of the air-cooled stack bipolar plates and sealing structure.

[0030] Figure 5 Detailed diagram of the bipolar plate anode flow field.

[0031] Figure 6 Detailed diagram of the bipolar plate cathode flow field.

[0032] Figure 7 Schematic diagram of other possible cathode flow field channels of the bipolar plate.

[0033] Explanation of the reference numerals: 1-blade; 2-bolt; 3-pneumatic elbow joint; 4-front end plate; 5-upper current collecting plate; 6-membrane electrode; 7-bipolar plate; 8-lower current collecting plate; 9-rear end plate; 10-front tail plate; 11-rear tail plate; 12-hydrogen through hole; 13-front tail plate sealing ring; 14-front tail plate sealing groove; 15-sealing ring at the hydrogen through hole on the cathode side; 16-sealing groove at the hydrogen through hole on the cathode side; 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 DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1 A wind-driven air-supply air-cooled battery stack comprises more than one battery unit, wherein the battery unit, a current collecting plate and an end plate are assembled into a battery stack, and the battery unit is assembled from a bipolar plate, a membrane electrode and a sealing ring.

[0036] In this embodiment, the current collecting plate is divided into an upper current collecting plate 5 and a lower current collecting plate 8, which play the role of collecting the current of the battery stack; the end plate includes a front end plate 4 and a rear end plate 9; the tail plate is divided into a front tail plate 10 and a rear tail plate 11; one side of the front tail plate is provided with two sealing grooves 14, and a sealing ring 13 is 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 collecting plate 5 is located between the front end plate 4 and the front tail plate, and the lower current collecting plate 8 is located between the rear end plate 9 and the rear tail plate 11; the battery unit is arranged between the front end plate 4 and the rear end plate 9, and the front and rear end plates and the upper and lower current collecting plates are all annular structures, and the central hollow structure is convenient for the battery stack to drain water; a space-avoiding structure is made at the upper current collecting plate corresponding to the hydrogen inlet and outlet positions, and a sealing ring is provided to prevent hydrogen leakage or hydrogen and oxygen from communicating with each other.

[0037] Specific as Figure 1a~Figure 1c As shown, in this embodiment, the wind energy driven air supply type air-cooled fuel cell stack is annular in structure as a whole, including a fan blade 1, a pneumatic elbow joint 3, a front end plate 4, an upper current collecting plate 5, a membrane electrode 6, a bipolar plate 7, a lower current collecting plate 8, a rear end plate 9, a front tail plate 10 and a rear tail plate 11; the front end plate 4, the front tail plate 10, the upper current collecting plate 5, the membrane electrode 6, the bipolar plate 7, the lower current collecting plate 8, the rear tail plate 11, the lower current collecting plate 8 and the rear end plate 9 are connected in order from top to bottom; the outer surface of the front end plate 4 is equipped with a fan blade 1; as shown in FIG. Figure 2 As shown, a hydrogen through hole 12 is provided on the front end plate 4, and the hydrogen through hole 12 extends all the way to the mounting groove of the upper current collecting plate 5. This is to prevent ion precipitation when hydrogen contacts the upper current collecting plate, and to seal hydrogen at the contact surface between the front end plate and the current collecting plate. In this embodiment, an upper current collecting plate 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 current collecting plate mounting groove; the hydrogen through hole 12 is in a shape of being larger at the top and smaller at the bottom. A pneumatic elbow joint is installed on the hydrogen through hole 12, and a quick-insert hose can be directly connected to the joint to allow hydrogen to enter and discharge.

[0038] In this embodiment, the fan blades serve as the core of the driving module, effectively utilizing wind energy to drive the entire annular stack to rotate at high speed. The outer ring of the stack is in a low-pressure state, and the strong pressure difference will draw air into the cathode flow channel along the tangent direction of the annular stack; the water and excess heat generated by the cathode flow channel reaction will be carried by the external air and discharged through the innermost side of the ring; two symmetrical through holes are provided on the front end plate, which are connected to the hydrogen inlet and outlet pipes through a curved pipe pneumatic joint. In this embodiment, the fan blade 1 is similar to the windmill structure of wind power generation, and uses wind power to drive the windmill blades to rotate. In this embodiment, wind energy is also captured by the fan blades 1; when the wind energy drives the air-cooled stack to rotate at a high speed, a low-pressure area will be formed on the outer ring of the stack, and the strong pressure difference will cause the air to be sucked into the air flow channel. At the same time, since the outer ring of the stack is a circular structure and the air flow channel is formed in a circular array, it is highly symmetrical and uniform, so that a circular equipotential velocity difference is formed on the outer ring of the stack. Therefore, due to the pressure difference of the equipotential surfaces, the air can be uniformly sucked into the air flow channel along the tangential direction of the outermost ring of the stack, and 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 flow channel.

[0039] like Figure 3 As shown, in this embodiment, a sealing ring 13 is provided between the front end plate 4, the upper current collecting plate 5 and the front tail plate 10. One side of the front tail plate 10 is provided with a front tail plate sealing groove 14 and is installed with a sealing ring 13, 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. When hydrogen enters the stack from the hydrogen inlet along the through 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 back of the front tail plate to seal the hydrogen through hole to the front tail plate to prevent hydrogen leakage. The sealing ring here can be cut by a die or a standard part, or it can be directly formed by dispensing glue on the front tail plate, but it is worth noting that the hardness of the sealing ring cannot exceed A35, otherwise there is a risk of plate rupture after locking.

[0040] 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 an organic solvent in which a perfluorosulfonic acid polymer is dissolved and then drying it at high temperature, and it plays the role of transmitting protons generated during the reaction of the fuel cell. 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 catalyst slurry containing carbon powder particles loaded with metal platinum on the surface on a polytetrafluoroethylene film, and the catalyst is carbon powder particles loaded with metal platinum on the surface. The gas diffusion layer plays the role of transmitting reaction gas and water and providing mechanical support for the membrane electrode assembly. It is obtained by soaking, drying and sintering a carbon fiber cloth with a hydrophobic material PTFE.

[0041] In this embodiment, the upper current collecting plate 5 and the lower current collecting plate 8 have the same structural profile, but the upper current collecting plate has an airtight position in the hydrogen through hole; the two current collecting plates are made of the same material, both of which are gold-plated copper plates with smooth surfaces. It is worth noting that the front and rear end plates are both 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 stack assembly.

[0042] In this embodiment, the entire battery stack is formed by stacking the above components and fastening them by four bolts 2, as shown in FIG1 . It is worth noting that the stack positioning effect can be achieved directly by inserting a cylinder with the same size as the inner diameter of the ring into the center of the ring.

[0043] Example 2 like Figure 4 As shown, the bipolar plate 7 in this embodiment is in the shape of a ring, one side of which is the anode side and the other side is the cathode side, and the hydrogen and air present a cross-flow; the anode flow field on the anode side is a symmetrical semicircular structure, and the flow channel is distributed from the center to the outer ring; the hydrogen flows in along the hydrogen through hole and is distributed by the long strip distribution area in the center, and finally flows out from the vent hole of the centrally symmetrical hydrogen outlet.

[0044] like Figure 6 and Figure 7 As shown, the air flow channel of the cathode flow field on the cathode surface has a structure that spreads outward from the inner ring. The air flows into the stack from the tangential direction of the outer ring of the stack, reacts with the hydrogen, and discharges the product water and takes away the excess heat from the outlet of the inner ring. The air flow channel of the cathode flow field in this embodiment is a fan-shaped structure (structure as shown in FIG. Figure 6 as shown) or a helical structure (structure as Figure 7 ). Figure 6 It can be seen that the air flow channel of the cathode flow field presents a fan-shaped structure and also presents a central symmetrical structure. The air flows into the stack from the tangential direction of the outer ring of the stack, reacts with the hydrogen, and discharges the product water and takes away the excess heat from the inner ring outlet. There are sealing grooves on the inner and outer rings of the cathode flow field, and there are also sealing grooves at the hydrogen through holes. Figure 7 As shown, the air flow channel of the cathode field can also be a spiral structure. Figure 6 The air flow channel structure can reduce the flow resistance of air along the tangential direction of the circle. It is worth noting that the positive and negative flow fields of the bipolar plate can be the same structure or can be set to different structural combinations, provided that it is feasible.

[0045] The upper hydrogen through hole of the cathode surface is provided with a circular cathode surface hydrogen through hole sealing groove 16, and the cathode surface hydrogen through hole sealing groove 16 is installed with a cathode surface hydrogen through hole sealing ring 15, mainly to prevent hydrogen from leaking from here to the air field. The outer ring and inner ring of the anode surface are respectively provided with an anode surface outer ring sealing groove 19 and an anode surface inner ring sealing groove 20; the outer ring and inner ring of the cathode surface are respectively provided with a cathode surface outer ring sealing groove 21 and a cathode surface inner ring sealing groove 22; wherein the anode surface outer ring sealing groove 19 and the cathode surface outer ring sealing groove 21 have the same contour in the vertical direction; the anode surface inner ring sealing groove 20 and the cathode surface inner ring sealing groove 22 also have the same contour in the vertical direction; the bipolar plate outer ring sealing ring 17 is respectively installed in the anode surface outer ring sealing groove 19 and the cathode surface outer ring sealing groove 21, and the bipolar plate inner ring sealing ring 18 is respectively installed in the anode surface inner ring sealing groove 20 and the cathode surface inner ring sealing groove 22. It is worth noting that the sealing ring here can be a standard part, cut by a die or made by dispensing glue, but the hardness of the sealing ring cannot exceed A35, otherwise there is a risk of plate rupture after locking.

[0046] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A wind-driven air-supply air-cooled fuel cell stack, characterized in that: The invention comprises a fan blade (1), a pneumatic elbow joint (3), a front end plate (4), an upper current collecting plate (5), a membrane electrode (6), a bipolar plate (7), a lower current collecting plate (8), a rear end plate (9), a front tail plate (10) and a rear tail plate (11); the front end plate (4), the front tail plate (10), the upper current collecting plate (5), the membrane electrode (6), the bipolar plate (7), the lower current collecting plate (8), the rear tail plate (11), the lower current collecting plate (8) and the rear end plate (9) are connected in order from top to bottom; the fan blade (1) is mounted on the outer surface of the front end plate (4); a hydrogen through hole (12) is opened on the front end plate (4); a pneumatic elbow joint is mounted on the hydrogen through hole (12), and a quick-insert hose can be directly connected to the joint to allow hydrogen to enter and discharge.

2. A wind-driven air-supply air-cooled fuel cell stack as claimed in claim 1, characterized in that: The wind-powered air-supply type air-cooled fuel cell stack is annular in structure as a whole.

3. A wind-driven air-supply air-cooled fuel cell stack as claimed in claim 1, characterized in that: An upper collector plate 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 collector plate mounting groove; the hydrogen through hole (12) is in a shape of being larger at the top and smaller at the bottom.

4. A wind-driven air-supply air-cooled fuel cell stack as claimed in claim 1, characterized in that: A sealing ring (13) is provided between the front end plate (4), the upper collecting plate (5) and the front tail plate (10).

5. A wind-driven air-supply air-cooled fuel cell stack as claimed in claim 1, characterized in that: One side of the front tail plate (10) is provided with a sealing groove (14) and a sealing ring (13) installed thereon, mainly to prevent hydrogen from leaking from the vent hole of the front end plate and between the front tail plate; the rear tail plate is not provided with a hydrogen vent hole.

6. A wind-driven air-supply air-cooled fuel cell stack as claimed in claim 1, characterized in that: The membrane electrode (6) is formed by hot-pressing and bonding a proton exchange membrane, a catalyst and a gas diffusion layer.

7. A bipolar plate used in a wind-driven air-fed air-cooled fuel cell stack as claimed in any one of claims 1 to 6, characterized in that: The bipolar plate (7) is in the shape of a ring, one side of which is an anode surface and the other side is a cathode surface; the anode flow field on the anode surface is a symmetrical semicircular structure, and the flow channel is distributed from the center to the outer ring; hydrogen flows in along the hydrogen through hole and is distributed by the long strip distribution area in the center, and finally flows out from the vent hole of the central symmetrical hydrogen outlet; the air flow channel of the cathode flow field on the cathode surface presents a structure that diffuses and extends from the inner ring to the outside, and the air flows into the stack from the tangential direction of the outer ring of the stack, reacts with the hydrogen, and discharges product water and takes away excess heat from the inner ring outlet.

8. The bipolar plate according to claim 7, characterized in that: The air flow channel of the cathode flow field is a fan-shaped structure or a spiral structure.

9. The bipolar plate according to claim 7, characterized in that: A circular cathode surface hydrogen through hole sealing groove (16) is provided at the upper hydrogen through hole of the cathode surface, and a cathode surface hydrogen through hole sealing ring (15) is installed on the cathode surface hydrogen through hole sealing groove (16), mainly to prevent hydrogen from leaking from this point to the air field.

10. The bipolar plate according to claim 7, characterized in that: The outer ring and inner ring of the anode surface are respectively provided with an anode surface outer ring sealing groove (19) and an anode surface inner ring sealing groove (20); the outer ring and inner ring of the cathode surface are respectively provided with a cathode surface outer ring sealing groove (21) and a cathode surface 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 have overlapping contours in the vertical direction; the inner ring sealing groove (20) of the anode surface and the inner ring sealing groove (22) of the cathode surface also have overlapping contours in the vertical direction; the bipolar plate outer ring sealing ring (17) is respectively installed in the anode surface outer ring sealing groove (19) and the cathode surface outer ring sealing groove (21), and the bipolar plate inner ring sealing ring (18) is respectively installed in the anode surface inner ring sealing groove (20) and the cathode surface inner ring sealing groove (22).

Images