Closed air-cooled metal bipolar plate

Abstract

The invention provides a closed air-cooled metal bipolar plate, which belongs to the field of fuel cells and comprises a metal cathode plate, a metal anode plate, a support gasket and an air cooling plate. The supporting gaskets and the air cooling plates are welded between the metal cathode plates and the metal anode plates to form three independent cavities of the bipolar plate. The three independent cavities comprise an anode reaction gas cavity, a cooling cavity and a cathode reaction gas cavity; and each chamber is provided with a special flow channel structure, so that reactants and cooling media are uniformly distributed in the respective chambers, and the reaction requirements of the respective chambers are met. Air is adopted as a cooling medium, the special sealing structure is beneficial to keeping the three cavities of the air-cooled bipolar plate mutually independent, the design form of the gas flow channel on the bipolar plate simplifies the complex structure of the traditional closed air-cooled fuel cell bipolar plate, the flow resistance is reduced, the sealing reliability is improved, and meanwhile, the bipolar plate is lighter.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuel cells, and particularly relates to a closed air-cooled metal bipolar plate. BACKGROUND

[0002] A proton exchange membrane fuel cell is a high-efficiency energy conversion device, and can be divided into a liquid-cooled type and an air-cooled type according to different cooling media. The liquid-cooled fuel cell adopts a cooling liquid for thermal management, but the system weight is relatively large, which is limited in application scenarios sensitive to weight, so the air-cooled fuel cell is widely concerned due to its lightweight potential.

[0003] In the air-cooled fuel cell, the closed bipolar plate adopts a three-independent-chamber design, including a cooling chamber, a cathode reaction gas chamber and an anode reaction gas chamber, and has a longer service life and better sealing performance compared with an open design. The metal bipolar plate can provide higher output voltage, and is commonly used in harsh weight environments, but the existing closed air-cooled metal bipolar plate often has a complex structure, large flow resistance, insufficient sealing reliability, and relatively large weight, and it is difficult to meet the performance while realizing effective lightweight.

[0004] Due to the problems of low chamber integration and unreasonable flow channel layout in the structural design of the existing closed air-cooled metal bipolar plate, the gas distribution is uneven, the cooling efficiency is low, and the complex sealing structure increases the manufacturing difficulty and cost, which affects the overall performance and reliability of the bipolar plate and limits its promotion in lightweight applications. SUMMARY

[0005] In order to solve the above problems in the prior art, the application provides a closed air-cooled metal bipolar plate. The technical problems to be solved by the application are realized through the following technical scheme:

[0006] The application provides a closed air-cooled metal bipolar plate, which comprises a metal cathode plate, a metal anode plate, a supporting gasket and an air-cooled plate; the air-cooled plate is located between the metal cathode plate and the metal anode plate and is fixed by welding; the supporting gasket is welded with the metal cathode plate and the metal anode plate through the cavity hole on the air-cooled plate to form three independent chambers of an anode reaction gas cavity, a cooling cavity and a cathode reaction gas cavity; the supporting gasket and the metal cathode plate and the metal anode plate are continuously welded to realize the sealing between the three independent chambers; the metal cathode plate and the metal anode plate are both stamping parts and respectively comprise a reaction gas inlet manifold port area, a reaction gas inlet reverse port area, a reaction area, a reaction gas outlet reverse port area and a reaction gas outlet manifold port area; the supporting gasket is four in total and respectively supports a cathode reaction gas inlet manifold port, a cathode reaction gas outlet manifold port, an anode reaction gas inlet manifold port and an anode reaction gas outlet manifold port; the air-cooled plate is provided with an air-cooled groove, the flow channel direction of the air-cooled groove is perpendicular to the reaction gas flow channel direction on the metal cathode plate and the metal anode plate; the cathode reaction gas inlet manifold port area and the cathode reaction gas outlet manifold port area are centrally and symmetrically distributed, and the anode reaction gas inlet manifold port area and the anode reaction gas outlet manifold port area are centrally and symmetrically distributed.

[0007] In an embodiment of the application, the air-cooled plate is fixed between the metal cathode plate and the metal anode plate by spot welding or segment welding. The welding requirement is to limit the relative position of the air-cooled plate, the metal cathode plate and the metal anode plate, does not involve the sealing of the air-cooled plate with the metal cathode plate and the metal anode plate, the welding mode is simple, the process requirement is low and easy to realize.

[0008] In an embodiment of the application, the welding line of the supporting gasket with the metal cathode plate and the metal anode plate is located around the edges of the cathode reaction gas inlet manifold port area, the cathode reaction gas outlet manifold port area, the anode reaction gas inlet manifold port area and the anode reaction gas outlet manifold port area, and the welding space range of the welding line is 1-3 mm. The design of the welding position further simplifies the sealing mode on the basis of meeting the functional requirements of each chamber, separates the three cavity gases, thereby optimizing the overall space, achieving balance and taking into account.

[0009] In an embodiment of the application, the width range of the air-cooled groove is 1-2 mm and the depth range is 1-1.5 mm.

[0010] In an embodiment of the application, the cathode reaction gas inlet reverse port area and the cathode reaction gas outlet reverse port area are centrally and symmetrically distributed, and the anode reaction gas inlet reverse port area and the anode reaction gas outlet reverse port area are centrally and symmetrically distributed.

[0011] In an embodiment of the present application, the cathode reaction gas inlet area comprises a first gas flow channel, a first support island, a second support island and a second gas flow channel; the first gas flow channel is staggered with the first support island and is formed by stamping; the first support island is a cylindrical support surface with a size ranging from 0.6 to 0.8 mm; the second gas flow channel is a circular through hole with a diameter ranging from 1 to 2 mm, and the circular through hole is divided into two parts by a radius of the circular through hole, one part is located on the cathode reaction gas inlet area, and the other part is located on the cathode reaction area, for conveying the cathode reaction gas from the second gas flow channel to the cathode reaction area.

[0012] In an embodiment of the present application, the reaction gas flow channels on the metal cathode plate and the metal anode plate are serpentine flow channels or parallel flow channels.

[0013] In an embodiment of the present application, the support pad is made of metal material, and the material of the support pad is the same as that of the metal cathode plate and the metal anode plate. Titanium alloy is selected as the material to further reduce the weight of the bipolar plate.

[0014] In an embodiment of the present application, the cooling cavity is in communication with the external air through the air cooling groove for air cooling.

[0015] In an embodiment of the present application, the anode reaction gas cavity, the cooling cavity and the cathode reaction gas cavity are sealed by continuous welding to ensure the independence of the gases.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] The closed air-cooled metal bipolar plate of the present application forms three independently sealed cavities through the combination of the metal cathode plate, the metal anode plate, the support pad and the air cooling plate, and ensures the independence of the gases between the cavities through continuous welding, thereby effectively improving the sealing reliability. The air cooling groove flow channel on the air cooling plate is designed perpendicularly to the reaction gas flow channel, which simplifies the structure of the bipolar plate, reduces the flow resistance and realizes the lightweight of the bipolar plate, solves the problems of complex structure, large flow resistance and insufficient sealing in the prior art, and improves the cooling efficiency and the uniformity of the reaction gas distribution.

[0018] The present application further optimizes the fluid distribution and structural stability through the support effect of the support pad on the total pipe port and the central symmetric distribution design on the cathode and anode plates. The specific size of the air cooling groove and the design of the gas flow channel of the counterport area enhance the cooling performance and the reaction gas transmission efficiency, thereby improving the output performance and durability of the fuel cell as a whole, and meeting the application requirements of lightweight and high reliability.

[0019] The above description is only a summary of the technical scheme of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are referred to. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a closed air-cooled metal bipolar plate provided by an embodiment of the present application;

[0021] Figure 2 is an exploded structural schematic diagram of a closed air-cooled metal bipolar plate provided by an embodiment of the present application;

[0022] Figure 3 is a chamber structural schematic diagram of a closed air-cooled metal bipolar plate provided by an embodiment of the present application;

[0023] Figure 4 is a structural schematic diagram of a metal cathode plate provided by an embodiment of the present application;

[0024] Figure 5 is a structural schematic diagram of a metal anode plate provided by an embodiment of the present application;

[0025] Figure 6 is a structural schematic diagram of a cathode reaction gas inlet port area provided by an embodiment of the present application;

[0026] Figure 7 is a flow channel structural schematic diagram provided by an embodiment of the present application;

[0027] Figure 8 is a welding line structural schematic diagram provided by an embodiment of the present application.

[0028] The accompanying drawings are referred to in the description. In the drawings: 1-metal cathode plate; 2-metal anode plate; 3-supporting gasket; 4-air-cooled plate; 5-cavity hole on air-cooled plate; 6-anode reaction gas cavity; 7-cooling cavity; 8-cathode reaction gas cavity; 9-cathode reaction gas inlet port area; 10-cathode reaction gas inlet port area; 11-cathode reaction area; 12-cathode reaction gas outlet port area; 13-cathode reaction gas outlet port area; 14-anode reaction gas inlet port area; 15-anode reaction gas inlet port area; 16-anode active reaction area; 17-anode reaction gas outlet port area; 18-anode reaction gas outlet port area; 19-cathode reaction gas inlet port; 20-cathode reaction gas outlet port; 21-anode reaction gas inlet port; 22-anode reaction gas outlet port; 23-air-cooled groove; 24-cathode reaction gas flow channel; 25-anode reaction gas flow channel; 26-first gas flow channel; 27-first supporting island; 28-second supporting island; 29-second gas flow channel; 30-welding line. DETAILED DESCRIPTION

[0029] In order to further clarify the technical means and effects taken by the present application to achieve the predetermined object, the following will be described in detail in combination with the drawings and specific embodiments, and a closed air-cooled metal bipolar plate according to the present application is described.

[0030] The foregoing and other technical contents, features and effects of the present application can be clearly presented in the following detailed description of specific embodiments in combination with the drawings. Through the description of the specific embodiments, the technical means and effects taken by the present application to achieve the predetermined object can be more deeply and specifically understood. However, the accompanying drawings are provided for reference and illustration only, and are not used to limit the technical solutions of the present application.

[0031] Embodiment one

[0032] According to the design requirements of the closed air-cooled metal bipolar plate, the battery performance, sealing and lightweight should be met at the same time. The present application provides a closed air-cooled metal bipolar plate, which adopts a new structure design to meet the battery performance requirements, improve the reliability of sealing, simplify the bipolar plate structure design, and thus achieve the lightweight design of the closed air-cooled metal bipolar plate. As shown in Figures 1 to 8 , Figure 1 is a structure diagram of a closed air-cooled metal bipolar plate provided by the embodiment of the present application; Figure 2 is an exploded structure diagram of the closed air-cooled metal bipolar plate provided by the embodiment of the present application; Figure 3 is a chamber structure diagram of the closed air-cooled metal bipolar plate provided by the embodiment of the present application; Figure 4 is a structure diagram of a metal cathode plate provided by the embodiment of the present application; Figure 5 is a structure diagram of a metal anode plate provided by the embodiment of the present application; Figure 6 is a structure diagram of a cathode reaction gas inlet port area provided by the embodiment of the present application; Figure 7 is a flow channel structure diagram provided by the embodiment of the present application; Figure 8 is a welding line structure diagram provided by the embodiment of the present application.

[0033] In the present embodiment, the closed air-cooled metal bipolar plate comprises a metal cathode plate 1, a metal anode plate 2, a support gasket 3 and an air-cooled plate 4; the air-cooled plate 4 is located between the metal cathode plate 1 and the metal anode plate 2 and is fixed by welding; the support gasket 3 is welded with the metal cathode plate 1 and the metal anode plate 2 through the air-cooled plate upper cavity hole 5 to form three independent chambers of an anode reaction gas cavity 6, a cooling cavity 7 and a cathode reaction gas cavity 8; the support gasket 3 and the metal cathode plate 1 and the metal anode plate 2 are continuously welded to realize the sealing between the three independent chambers; the metal cathode plate 1 and the metal anode plate 2 are both stamping parts, and each comprises a reaction gas inlet manifold port area, a reaction gas inlet reverse port area, a reaction area, a reaction gas outlet reverse port area and a reaction gas outlet manifold port area; the support gasket 3 is used to support the cathode reaction gas inlet manifold port 19, the cathode reaction gas outlet manifold port 20, the anode reaction gas inlet manifold port 21 and the anode reaction gas outlet manifold port 22 respectively; the air-cooled plate 4 is provided with an air-cooled groove 23, the flow direction of the air-cooled groove 23 is perpendicular to the reaction gas flow direction on the metal cathode plate 1 and the metal anode plate 2; the cathode reaction gas inlet manifold port area 9 and the cathode reaction gas outlet manifold port area 13 are centrally symmetrically distributed, the anode reaction gas inlet manifold port area 14 and the anode reaction gas outlet manifold port area 18 are centrally symmetrically distributed, and the length-width ratio of the port shape is close to 1, thereby helping to realize the uniform distribution of the reaction gas in the flow channel, reducing the flow dead zone and improving the reaction efficiency.

[0034] In an optional embodiment, the metal cathode plate 1 and the metal anode plate 2 are both stamping parts; the air-cooled plate 4 is fixed between the metal cathode plate 1 and the metal anode plate 2 by spot welding or segment welding.

[0035] In an optional embodiment, the welding line 30 of the support gasket 3 and the metal cathode plate 1 and the metal anode plate 2 is located around the edges of the cathode reaction gas inlet manifold port area 9, the cathode reaction gas outlet manifold port area 13, the anode reaction gas inlet manifold port area 14 and the anode reaction gas outlet manifold port area 18, and the welding space range of the welding line 30 is 1-3 mm, which not only ensures the welding strength and sealing reliability, but also avoids the deformation of the plate or the gas leakage due to the excessive heat affected zone caused by welding.

[0036] In an optional embodiment, the width of the air-cooled groove 23 is 1-2 mm, and the depth is 1-1.5 mm, which can meet the heat dissipation required by the reaction and reduce the flow resistance.

[0037] In an optional embodiment, the cathode reaction gas inlet reverse port area 10 and the cathode reaction gas outlet reverse port area 12 are centrally symmetrically distributed, and the anode reaction gas inlet reverse port area 15 and the anode reaction gas outlet reverse port area 17 are centrally symmetrically distributed.

[0038] In an alternative embodiment, the cathode reaction gas inlet port area 10 comprises a first gas flow channel 26, a first support island 27, a second support island 28 and a second gas flow channel 29; the first gas flow channel 26 is staggered with the first support island 27 and is formed by stamping; the first support island 27 is a cylindrical support surface with a size ranging from 0.6 to 0.8 mm; the second gas flow channel 29 is a circular through-hole with a diameter ranging from 1 to 2 mm, and is divided into two parts by the radius of the circular through-hole, one part is located in the cathode reaction gas inlet port area 10, and the other part is located in the cathode reaction area 11, for transporting the cathode reaction gas from the second gas flow channel 29 to the cathode reaction area 11. In this way, by staggering the first support island 27 and the second support island 28, not only does it serve as a structural support to prevent the deformation of the plate, but it also optimizes the uniformity of the distribution of the reaction gas by reasonably distributing the gas flow channels.

[0039] In an alternative embodiment, the reaction gas flow channels on the metal cathode plate 1 and the metal anode plate 2 are serpentine flow channels or parallel flow channels. Further, by designing the air cooling flow channel to be perpendicular to the reaction gas flow channel, the heat exchange strength between the cooling air and the reaction area is enhanced, heat accumulation is avoided, and the uniformity of heat dissipation is improved. This structure is particularly suitable for high-power density fuel cells, which can effectively control the operating temperature of the battery without increasing the weight.

[0040] In an alternative embodiment, the support gasket 3 passes through the cavity hole 5 on the air cooling plate and is fixed to the metal cathode plate 1 and the metal anode plate 2 by continuous welding, thereby achieving reliable sealing between the chambers while connecting the structure. For example, the support gasket 3 is provided with four support gaskets, which correspond to the support cathode reaction gas inlet manifold port 19, the cathode reaction gas outlet manifold port 20, the anode reaction gas inlet manifold port 21 and the anode reaction gas outlet manifold port 22, respectively, to enhance the structural stability and prevent welding deformation.

[0041] Preferably, the support gasket 3 is made of a metal material, and the material of the support gasket 3 is the same as that of the metal cathode plate 1 and the metal anode plate 2.

[0042] In an alternative embodiment, the cooling cavity 7 is in communication with the external air through the air cooling groove 23 for air cooling.

[0043] In an alternative embodiment, the anode reaction gas cavity 6, the cooling cavity 7 and the cathode reaction gas cavity 8 are sealed by continuous welding to ensure that the gases are independent of each other. In this way, by continuous welding between the support gasket 3 and the metal plate, complete independent sealing between the anode reaction gas cavity 6, the cooling cavity 7 and the cathode reaction gas cavity 8 is achieved. This structure not only effectively prevents gas cross leakage and improves the safety of the battery operation, but also simplifies the traditional multi-layer sealing structure, reduces the manufacturing cost and assembly complexity.

[0044] It is worth noting that the support gasket 3 and the plurality of support islands jointly constitute the internal support system of the bipolar plate, which not only enhances the overall structural rigidity and prevents deformation of the polar plate caused by gas pressure or thermal stress, but also optimizes the distribution of the reaction gas by reasonably arranging the gas channels, thereby improving the performance and durability of the battery.

[0045] In order to better enable those skilled in the art to fully understand and implement the present application, the specific implementation principles of the present application are further described below in conjunction with a specific application scenario.

[0046] The closed air-cooled metal bipolar plate of the present application comprises a metal cathode plate 1, a metal anode plate 2, a support gasket 3 and an air-cooled plate 4, wherein the air-cooled plate 4 is located between the metal cathode plate 1 and the metal anode plate 2. The support gasket 3 is welded and fixed with the metal cathode plate 1 and the metal anode plate 2 through the air-cooled plate upper cavity hole 5, forming a metal bipolar plate with an anode reaction gas cavity 6, a cooling cavity 7 and a cathode reaction gas cavity 8.

[0047] Specifically, the metal cathode plate 1 comprises a cathode reaction gas inlet manifold port area 9, a cathode reaction gas inlet reverse port area 10, a cathode reaction area 11, a cathode reaction gas outlet reverse port area 12 and a cathode reaction gas outlet manifold port area 13. The metal anode plate 2 comprises an anode reaction gas inlet manifold port area 14, an anode reaction gas inlet reverse port area 15, an anode active reaction area 16, an anode reaction gas outlet reverse port area 17 and an anode reaction gas outlet manifold port area 18.

[0048] The cathode reaction gas inlet manifold port area 9 is provided with a cathode reaction gas inlet manifold port 19, and the cathode reaction gas outlet manifold port area 13 is provided with a cathode reaction gas outlet manifold port 20; the anode reaction gas inlet manifold port area 14 is provided with an anode reaction gas inlet manifold port 21, and the anode reaction gas outlet manifold port area 18 is provided with an anode reaction gas outlet manifold port 22. The support gasket 3 is provided with four, which respectively support the cathode reaction gas inlet manifold port 19, the cathode reaction gas outlet manifold port 20, the anode reaction gas inlet manifold port 21 and the anode reaction gas outlet manifold port 22.

[0049] The air-cooled plate 4 is provided with an air-cooled groove 23, which provides a flow space for the cooling medium air. The flow direction of the air-cooled groove 23 is perpendicular to the direction of the cathode reaction gas flow channel 24 and the anode reaction gas flow channel 25, which can effectively enhance the heat exchange efficiency between the cooling medium and the reaction area, avoid the interference of the gas flow, and thus improve the overall heat dissipation uniformity. The cathode reaction gas inlet manifold port area 9 and the cathode reaction gas outlet manifold port area 13 are centrally symmetrically distributed, and the cathode reaction gas inlet reverse port area 10 and the cathode reaction gas outlet reverse port area 12 are centrally symmetrically distributed.

[0050] The cathode reaction gas inlet area 10 comprises a first gas flow channel 26, a first support island 27, a second support island 28, and a second gas flow channel 29; a welding line 30 is arranged around the edges of the cathode reaction gas inlet manifold area 9 and the anode reaction gas inlet manifold area 14, and the welding space range can be set to 1-3 mm.

[0051] The cathode reaction gas flows from the cathode reaction gas inlet manifold area 9, passes through the first gas flow channel 26 and the second gas flow channel 29 inside the cathode reaction gas inlet area 10, and reaches the cathode reaction area 11 for chemical reaction, and then the reacted gas passes through the cathode reaction gas outlet area 12, reaches the cathode reaction gas outlet manifold area 13, and finally leaves the bipolar plate. The cooling air enters the cooling groove 23 on the side of the air cooling plate 4, flows along the direction of the cooling groove 23, and leaves the bipolar plate, while taking away the heat generated by the reaction.

[0052] The closed air-cooled metal bipolar plate of the application forms three independently sealed chambers through the combined structure of the metal cathode plate, the metal anode plate, the support gasket, and the air cooling plate, and ensures the gas independence between the chambers through continuous welding, effectively improving the sealing reliability. The cooling groove flow channel on the air cooling plate is designed vertically to the reaction gas flow channel, which simplifies the structure of the bipolar plate, reduces the flow resistance, realizes the lightweight of the bipolar plate, solves the problems of complex structure, large flow resistance and insufficient sealing in the prior art, and improves the cooling efficiency and reaction gas distribution uniformity.

[0053] The application further optimizes the fluid distribution and structural stability through the support effect of the support gasket on the manifold inlet and the center-symmetric distribution design on the cathode and anode plates. The specific size of the cooling groove and the gas flow channel design of the counterport area enhance the cooling performance and reaction gas transmission efficiency, thereby improving the output performance and durability of the fuel cell as a whole, and meeting the application requirements of lightweight and high reliability.

[0054] It is to be understood that the terminology used herein such as first and second, and the like, is only to distinguish one from another without prejudice to either and is not necessarily used in a sequence. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a vesicle or an apparatus that comprises a list of components does not include only those components but can include other components not expressly listed or inherent to such vesicle or apparatus. The terms "comprises", "comprising", or any other variations thereof, do not have the meaning of excluding other components not expressly listed. The term "connected" or "coupled" or any other variations thereof are not to be construed as being necessarily limited to a physical or mechanical connection or coupling, but can also include an electrical connection or coupling, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships as shown in the drawings and are made only for the purpose of ease of description and illustration, and thus can not be construed as indicating or implying necessary or absolutely specific orientations, configurations, or operations of the device or components thereof, and therefore should not be understood as limiting the present application.

[0055] The above description is further to the present application in connection with specific preferred embodiments, and cannot be deemed as limiting the specific implementation of the present application to these descriptions. For those skilled in the art to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, and all of these should be deemed as falling within the protection scope of the present application.

Claims

1. A closed air-cooled type metal bipolar plate, characterized by, The application relates to a metal plate type air-cooled plate, which comprises a metal cathode plate, a metal anode plate, a supporting gasket and an air-cooled plate; the air-cooled plate is located between the metal cathode plate and the metal anode plate and is fixed by welding; the supporting gasket is welded with the metal cathode plate and the metal anode plate through a cavity hole on the air-cooled plate to form three independent chambers of an anode reaction gas cavity, a cooling cavity and a cathode reaction gas cavity; the supporting gasket and the metal cathode plate and the metal anode plate are continuously welded to realize sealing among the three independent chambers; the metal cathode plate and the metal anode plate are stamping parts and respectively comprise a reaction gas inlet manifold port area, a reaction gas inlet reverse port area, a reaction area, a reaction gas outlet reverse port area and a reaction gas outlet manifold port area; the supporting gasket is provided with four supporting gaskets which respectively support a cathode reaction gas inlet manifold port, a cathode reaction gas outlet manifold port, an anode reaction gas inlet manifold port and an anode reaction gas outlet manifold port; the air-cooled plate is provided with an air-cooled groove, the flow channel direction of the air-cooled groove is perpendicular to the reaction gas flow channel direction on the metal cathode plate and the metal anode plate; the cathode reaction gas inlet manifold port area and the cathode reaction gas outlet manifold port area are centrally and symmetrically distributed, and the anode reaction gas inlet manifold port area and the anode reaction gas outlet manifold port area are centrally and symmetrically distributed.

2. The closed air-cooled type metal bipolar plate according to claim 1, characterized by The air-cooled plate is fixed between the metal cathode plate and the metal anode plate by spot welding or segment welding.

3. The closed air-cooled type metal bipolar plate according to claim 1, wherein The welding line of the supporting gasket and the metal cathode plate and the metal anode plate is located around the edges of the cathode reaction gas inlet manifold port area, the cathode reaction gas outlet manifold port area, the anode reaction gas inlet manifold port area and the anode reaction gas outlet manifold port area, and the welding space range of the welding line is 1-3mm.

4. The closed air-cooled type metal bipolar plate according to claim 1, wherein The width range of the air-cooled groove is 1-2mm, and the depth range is 1-1.5mm.

5. The closed air-cooled type metal bipolar plate according to claim 1, wherein The cathode reaction gas inlet reverse port area and the cathode reaction gas outlet reverse port area are centrally and symmetrically distributed, and the anode reaction gas inlet reverse port area and the anode reaction gas outlet reverse port area are centrally and symmetrically distributed.

6. The closed air-cooled type metal bipolar plate according to claim 1, wherein The cathode reaction gas inlet reverse port area comprises a first gas flow channel, a first supporting island, a second supporting island and a second gas flow channel; the first gas flow channel and the first supporting island are staggered and arranged by stamping forming; the first supporting island is a cylindrical supporting surface, and the size range is 0.6-0.8mm; the second gas flow channel is a circular through hole, the diameter range is 1-2mm, and the circular through hole is taken as a boundary line, one half is located on the cathode reaction gas inlet reverse port area, and the other half is located on the cathode reaction area, and is used for conveying cathode reaction gas from the second gas flow channel to the cathode reaction area.

7. The closed air-cooled type metal bipolar plate according to claim 1, wherein The reaction gas flow channel on the metal cathode plate and the metal anode plate is a serpentine flow channel or a parallel flow channel.

8. The closed air-cooled type metal bipolar plate according to claim 1, wherein The supporting gasket is made of metal material, and the material of the supporting gasket is the same as that of the metal cathode plate and the metal anode plate.

9. The closed air-cooled type metal bipolar plate according to claim 1, wherein The cooling cavity is communicated with external air through the air-cooled groove and is used for air cooling.

10. The closed air-cooled type metal bipolar plate according to claim 1, wherein The anode reaction gas cavity, the cooling cavity and the cathode reaction gas cavity are sealed by continuous welding to ensure that the gases are independent of each other.

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