Bipolar plates and fuel cells

Abstract

The present application provides a bipolar plate and a fuel cell. The bipolar plate comprises a cathode plate (1) and an anode plate (2), wherein the cathode plate (1) and the anode plate (2) are monopolar plates with the same structure, wherein the cathode plate (1) comprises a first oxygen interface (3), a second oxygen interface (4), a first hydrogen interface (5), a second hydrogen interface (6), a first coolant interface (7) and a second coolant interface (8), wherein the first coolant interface (7) is symmetrical about the longitudinal midplane of the cathode plate (1), the second coolant interface (8) is centrally symmetrical with the first coolant interface (7), the first hydrogen interface (5) and the first oxygen interface (3) are symmetrical about the transverse midplane of the cathode plate (1), and the second hydrogen interface (6) and the second oxygen interface (4) are symmetrical about the transverse midplane of the cathode plate (1). According to the bipolar plate of the present application, the mold making cost can be reduced, the mold replacement time during stamping can be shortened, and the plate production efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a bipolar plate and a fuel cell. Background Art

[0002] The main components of a fuel cell stack (hereinafter referred to as the stack) are: end plates, bipolar plates (also called separators), and membrane electrodes (including carbon paper diffusion layers, electrolyte membranes, and catalyst layers).

[0003] The reactants (hydrogen and oxygen) are mainly bipolar plates, which are divided into cathode plates (oxygen side) and anode plates (hydrogen side). The materials are divided into metal plates, graphite plates and composite plates. Since metal plates have high strength, light weight and good conductivity, metal bipolar plates are the main development direction at present.

[0004] There are many applications for bipolar plate design both at home and abroad. The most common way to form metal bipolar plates is by stamping ultra-thin metal plates, which has the advantages of mass production and good quality consistency of bipolar plates.

[0005] However, in the actual production process, due to the different structures of the anode plate and the cathode plate, two sets of molds are required, one for forming the anode plate and the other for forming the cathode plate. This will increase the mold making cost and the mold replacement time during stamping, thus reducing the plate production efficiency. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present application is to provide a bipolar plate and a fuel cell, which can reduce the mold making cost, shorten the mold replacement time during stamping, and improve the production efficiency of the plate.

[0007] In order to solve the above problems, the present application provides a bipolar plate, including a cathode plate and an anode plate, the cathode plate and the anode plate are monopolar plates with the same structure, the cathode plate includes a first oxygen interface, a second oxygen interface, a first hydrogen interface, a second hydrogen interface, a first coolant interface and a second coolant interface, the first coolant interface is symmetrical about the longitudinal midplane of the cathode plate, the second coolant interface is symmetrical with the center of the first coolant interface, the first hydrogen interface and the first oxygen interface are symmetrical about the transverse midplane of the cathode plate, and the second hydrogen interface and the second oxygen interface are symmetrical about the transverse midplane of the cathode plate.

[0008] Preferably, the first hydrogen interface and the second oxygen interface are symmetrical about the longitudinal midplane of the cathode plate.

[0009] Preferably, an oxygen flow channel is provided on the cathode plate, and the oxygen flow channel is symmetrical about the center of the cathode plate.

[0010] Preferably, the first end of the oxygen flow channel is communicated with the first oxygen interface, the second end of the oxygen flow channel is communicated with the second oxygen interface, and the oxygen flow channel is in a zigzag shape.

[0011] Preferably, the cathode plate comprises a reaction side and a cooling side, the reaction side is provided with a plurality of flow guiding protrusions, and oxygen flow channels are formed between adjacent flow guiding protrusions.

[0012] Preferably, the multiple guide protrusions include a first guide protrusion and a second guide protrusion, the first guide protrusion includes a first fold line segment, a second fold line segment and a third fold line segment, the second guide protrusion includes a first partition segment and a second partition segment, the first fold line segment is connected to the first oxygen interface, the first partition segment is located between two adjacent second fold line segments, and divides the oxygen flow channel between the two adjacent second fold line segments into two, and the second partition segment is located between two adjacent third fold line segments, and divides the oxygen flow channel between the two adjacent third fold line segments into two.

[0013] Preferably, the plurality of guide protrusions further include a third guide protrusion, which is disposed between the third fold line segment and the second partition segment and divides the oxygen flow channel between the third fold line segment and the second partition segment into two.

[0014] Preferably, the oxygen flow channel between adjacent first fold line segments, the oxygen flow channel between the first partition segment and the second fold line segment, and the oxygen flow channel between the third fold line segment and the second partition segment have the same width.

[0015] Preferably, the width of the oxygen flow channel is the same as the width of the first guide protrusion, the second guide protrusion and the third guide protrusion.

[0016] Preferably, an angle α is formed between the terminal edge of the first fold line segment and the terminal edge of the first partition segment, wherein α=arccos1 / 3.

[0017] Preferably, the first fold line segment, the third fold line segment, the second partition segment and the third guide protrusion are parallel to each other, and the second fold line segment and the first partition segment are parallel to each other.

[0018] Preferably, on the reaction side of the cathode plate, sealing rubber grooves are provided around the first hydrogen interface, the second hydrogen interface, the first oxygen interface, the second oxygen interface, the first coolant interface and the second coolant interface.

[0019] Preferably, the oxygen flow channels between the second fold line segments on the cooling side of the cathode plate cross-match with the oxygen flow channels between the second fold line segments on the cooling side of the anode plate.

[0020] According to another aspect of the present application, a fuel cell is provided, comprising a bipolar plate, which is the bipolar plate described above.

[0021] The bipolar plate provided in the present application comprises a cathode plate and an anode plate, wherein the cathode plate and the anode plate are monopolar plates with the same structure, and the cathode plate comprises a first hydrogen interface, a second hydrogen interface, a first oxygen interface, a second oxygen interface, a first coolant interface and a second coolant interface, wherein the first coolant interface is symmetrical about the longitudinal midplane of the cathode plate, the second coolant interface is symmetrical with respect to the center of the first coolant interface, the first hydrogen interface and the first oxygen interface are symmetrical about the transverse midplane of the cathode plate, and the second hydrogen interface and the second oxygen interface are symmetrical about the transverse midplane of the cathode plate. The first coolant interface of the bipolar plate is symmetrical about the longitudinal midplane of the cathode plate, the second coolant interface is symmetrical with the center of the first coolant interface, the first hydrogen interface and the first oxygen interface are symmetrical about the transverse midplane of the cathode plate, and the second hydrogen interface and the second oxygen interface are symmetrical about the transverse midplane of the cathode plate. Therefore, a special matching relationship is formed between the structures of the various gas interfaces and the cooling interfaces, thereby ensuring that when the same set of molds are used to form anode plates and cathode plates with the same structure, the formed monopolar plate can be used as both an anode plate and a cathode plate, and the various interfaces of the anode plate and the cathode plate can be well matched, thereby smoothly realizing a one-mold dual-plate structure, saving a set of molds, reducing the cost of mold making, shortening the mold replacement time during stamping, and improving the production efficiency of the polar plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cathode plate structure diagram of a bipolar plate of an embodiment of the present application;

[0023] Figure 2 This is an exploded structural diagram of a bipolar plate according to an embodiment of the present application;

[0024] Figure 3 A partial cross-sectional structural diagram of a bipolar plate according to an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the cooling liquid flow channel structure of the bipolar plate of an embodiment of the present application;

[0026] Figure 5 This is a structural diagram of the cathode plate of a bipolar plate according to another embodiment of the present application.

[0027] The reference numerals are:

[0028] 1. cathode plate; 2. anode plate; 3. first oxygen interface; 4. second oxygen interface; 5. first hydrogen interface; 6. second hydrogen interface; 7. first coolant interface; 8. second coolant interface; 9. oxygen flow channel; 10. first fold line segment; 11. second fold line segment; 12. third fold line segment; 13. first partition segment; 14. second partition segment; 15. third guide protrusion; 16. sealant groove; 17. diversion protrusion; 18. coolant flow channel. DETAILED DESCRIPTION

[0029] See also Figures 1 to 5 As shown, according to an embodiment of the present application, the bipolar plate includes a cathode plate 1 and an anode plate 2, the cathode plate 1 and the anode plate 2 are monopolar plates with the same structure, the cathode plate 1 includes a first oxygen interface 3, a second oxygen interface 4, a first hydrogen interface 5, a second hydrogen interface 6, a first coolant interface 7 and a second coolant interface 8, the first coolant interface 7 is symmetrical about the longitudinal midplane of the cathode plate 1, the second coolant interface 8 is symmetrical with the center of the first coolant interface 7, the first hydrogen interface 5 and the first oxygen interface 3 are symmetrical about the transverse midplane of the cathode plate 1, and the second hydrogen interface 6 and the second oxygen interface 4 are symmetrical about the transverse midplane of the cathode plate 1.

[0030] The first coolant interface 7 of the bipolar plate is symmetrical about the longitudinal midplane of the cathode plate 1, the second coolant interface 8 is symmetrical with the center of the first coolant interface 7, the first hydrogen interface 5 and the first oxygen interface 3 are symmetrical about the transverse midplane of the cathode plate 1, and the second hydrogen interface 6 and the second oxygen interface 4 are symmetrical about the transverse midplane of the cathode plate 1, so that a special matching relationship is formed between the structures of the various gas interfaces and the cooling interfaces, thereby ensuring that when the anode plate 2 and the cathode plate 1 with the same structure are formed using the same set of molds, the formed monopolar plate can be used as both the anode plate 2 and the cathode plate 1, and the various interfaces of the anode plate 2 and the cathode plate 1 can be well matched, thereby smoothly realizing a one-mold double-plate structure, saving a set of molds, reducing the mold making costs, shortening the mold replacement time during stamping, and improving the plate production efficiency.

[0031] See also Figure 1 As shown, the longitudinal midplane is a plane passing through the center of the short side of the cathode plate 1 and perpendicular to the plate surface of the cathode plate 1 , and the transverse midplane is a plane passing through the center of the long side of the cathode plate 1 and perpendicular to the plate surface of the cathode plate 1 .

[0032] Each monopolar plate of the bipolar plate in the present application adopts a one-mold two-plate design, and the reaction side of the fuel cell monopolar plate punched out by the mold can be used as the anode plate 2 for hydrogen reaction, or as the cathode plate 1 for oxygen reaction. The two monopolar plates are formed into a "two-plate three-field" bipolar plate by laser welding or gluing. "Two-plate three-field" means that the reaction sides of the two plates are used as the reaction fields for oxygen and hydrogen reactions respectively, and the cavity formed by the cooling sides of the two plates is the cooling field for the flow of cooling water.

[0033] When making bipolar plates, one of the monopolar plates made by a set of molds can be used as the cathode plate 1, and then the second monopolar plate is placed in the same structure as the cathode plate 1, and then the second monopolar plate is rotated 180° around the center of the monopolar plate to serve as the anode plate 2, and then the second monopolar plate is flipped 180° around the long side, and finally the two monopolar plates are stacked and assembled so that the cooling sides of the two monopolar plates are attached together and fixed together by gluing or welding to form a bipolar plate.

[0034] The bipolar plate in the present application has the structural feature of one mold and two plates. In addition to achieving the same fuel cell reaction function, it can save the mold manufacturing costs of actual production and the mold replacement time cost during stamping production, and is suitable for large-scale production of fuel cell bipolar plates.

[0035] The first hydrogen interface 5 and the second oxygen interface 4 are symmetrical about the longitudinal midplane of the cathode plate 1, so that the shapes of the four gas interface structures are consistent, which can improve the consistency of the gas interface shapes and improve the molding efficiency.

[0036] An oxygen flow channel 9 is provided on the cathode plate 1 , and the oxygen flow channel 9 is symmetrical about the center of the cathode plate 1 , which facilitates the design of the mold, reduces the mold design cost, and facilitates the design of the oxygen flow channel 9 and the cooling side flow channel.

[0037] The first end of the oxygen flow channel 9 is communicated with the first oxygen interface 3, and the second end of the oxygen flow channel 9 is communicated with the second oxygen interface 4, and the oxygen flow channel 9 is in a zigzag shape. In this embodiment, the first oxygen interface 3, the first hydrogen interface 5 and the first coolant interface 7 are located at the first end of the long side of the cathode plate 1, and are arranged side by side, the second oxygen interface 4, the second hydrogen interface 6 and the second coolant interface 8 are located at the second end of the long side of the cathode plate 1, and are arranged side by side, and the oxygen flow channel 9 is arranged in a zigzag shape, which is more conducive to the connection and layout of the first oxygen interface 3, the second oxygen interface 4 and the oxygen flow channel 9.

[0038] The cathode plate 1 comprises a reaction side and a cooling side. The reaction side is provided with a plurality of flow guiding protrusions, and oxygen flow channels 9 are formed between adjacent flow guiding protrusions.

[0039] In one embodiment, the plurality of guide protrusions include a first guide protrusion and a second guide protrusion, the first guide protrusion includes a first fold line segment 10, a second fold line segment 11 and a third fold line segment 12, the second guide protrusion includes a first partition segment 13 and a second partition segment 14, the first fold line segment 10 is connected to the first oxygen interface 3, the first partition segment 13 is located between two adjacent second fold line segments 11, and the oxygen flow channel 9 between the two adjacent second fold line segments 11 is divided into two, the second partition segment 14 is located between two adjacent third fold line segments 12, and the oxygen flow channel 9 between the two adjacent third fold line segments 12 is divided into two, so that the number of oxygen flow channels 9 gradually increases along the direction from the edge to the middle, which facilitates the oxygen to fully contact and react with the hydrogen in the central area, thereby improving the reaction efficiency of the gas.

[0040] In one embodiment, the plurality of guide protrusions further include a third guide protrusion 15, which is disposed between the third fold line segment 12 and the second partition segment 14, and divides the oxygen flow channel 9 between the third fold line segment 12 and the second partition segment 14 into two.

[0041] The flow channel structure of the present application utilizes the characteristic of the widened flow channel width formed by the bend at the bend of the flow channel, and realizes the re-division of the flow channel after the bend by adding a new guide protrusion, so that the number of flow channels can be easily increased. Taking the first oxygen interface 3 as the starting end, in the process from the first fold line segment 10 to the second fold line segment 11, the number of single oxygen flow channels 9 is divided from 1 flow channel to 2 flow channels, and in the process from the second fold line segment 11 to the third fold line segment 12, the single flow channel is further divided into 2 flow channels, so that the oxygen flow channel 9 is divided into 4 flow channels from 1 flow channel at the starting end to the straight flow channel area in the middle area during the process from the first fold line segment 10 to the third fold line segment 12, thereby saving the area occupied by the arrangement of the plate air inlet or outlet, making the plate structure more compact.

[0042] In one embodiment, the monopolar plate is a metal plate, and a metal plate with a thickness of 0.1 mm can be pressed into a metal monopolar plate with the above-mentioned flow channel structure. The monopolar plate is provided with an oxygen inlet and outlet, a hydrogen inlet and outlet, and a cooling water inlet and outlet. The oxygen inlet and outlet and the hydrogen inlet and outlet are respectively arranged on both sides of the cooling water inlet and outlet, and there are 4 positioning holes around the monopolar plate. The monopolar plate can also be a graphite plate.

[0043] On the side where the anode plate 2 is located, hydrogen flows into the flow field area on the anode plate 2 through the hydrogen inlet on the anode plate 2, and then diffuses through the flow channel to the flat flow channel part of the middle area of ​​the entire anode plate 2. The hydrogen tail gas after the reaction is re-converged to the hydrogen outlet through the hydrogen flow channel and flows out.

[0044] In one of the embodiments, the widths of the oxygen flow channel 9 between adjacent first fold line segments 10, the oxygen flow channel 9 between the first partition segment 13 and the second fold line segment 11, and the oxygen flow channel 9 between the third fold line segment 12 and the second partition segment 14 are the same, so that during the gas flow channel diversion process, the width of a single flow channel can basically remain unchanged, thereby reducing the sudden change in the gas flow process and improving the uniformity and stability of the gas flow.

[0045] The width of the oxygen flow channel 9 is the same as the width of the first flow guiding protrusion, the second flow guiding protrusion and the third flow guiding protrusion 15 .

[0046] An angle α is formed between the end boundary of the first fold line segment 10 and the end boundary of the first partition segment 13, wherein α=arccos1 / 3, the second fold line segment 11 and the first partition segment 13 are perpendicular to the end boundary of the first fold line segment 10, and the third fold line segment 12, the second partition segment 14 and the third guide protrusion 15 are perpendicular to the end boundary of the first partition segment 13.

[0047] The width of the oxygen flow channel 9 is the same as the width of the first guide protrusion, the second guide protrusion and the third guide protrusion 15, and the width of each flow channel is the same, and the width of each flow channel is the same as the protrusion width. Therefore, the angle α formed between the end boundary of the first fold line segment 10 and the end boundary of the first partition segment 13 can be set to increase the width of the oxygen flow channel 9 from L in the area where the first fold line segment 10 is located to 3L in the area where the second fold line segment 11 is located. Since the first partition segment 13 with a width of L is added in the middle of the oxygen flow channel 9 in the area where the second fold line segment 11 is located, the remaining 2L width of the oxygen flow channel 9 can be divided into two by the first partition segment 13, so that the width of the oxygen flow channel 9 between the first partition segment 13 and the second fold line segment 11 is also L, so that the width of a single oxygen flow channel 9 is constant at L, basically unchanged, thereby improving the stability of the fluid flow in the flow channel.

[0048] In this embodiment, the first fold line segment 10, the third fold line segment 12, the second partition segment 14 and the third flow guide protrusion 15 are parallel to each other, and the second fold line segment 11 and the first partition segment 13 are parallel to each other. The first fold line segment 10 and the third fold line segment 12 are parallel to the longitudinal midplane of the monopolar plate, so that the fluid flow channels in the areas where the first fold line segment 10 and the third fold line segment 12 are located are flat and straight channels, and the flow is smoother.

[0049] On the reaction side of the cathode plate 1, a sealant groove 16 is provided around the first hydrogen interface 5, the second hydrogen interface 6, the first oxygen interface 3, the second oxygen interface 4, the first coolant interface 7 and the second coolant interface 8. The sealant groove 16 is used to load a sealing rubber ring to seal and isolate the gas interface and the coolant interface. To assemble two monopolar plates into a bipolar plate, the coolant cavity needs to be sealed by gluing or laser welding, leaving only the cooling water inlet and outlet; the gas inlet and the coolant flow cavity are sealed to prevent gas and coolant leakage. After assembly, the bipolar plate is sealed with a sealing rubber ring to seal the gas.

[0050] The oxygen flow channels 9 between the second fold line segments 11 on the cooling side of the cathode plate 1 are cross-matched with the oxygen flow channels 9 between the second fold line segments 11 on the cooling side of the anode plate 2 .

[0051] The cooling side of the monopolar plate in this embodiment is provided with a coolant flow channel 18 , and the coolant flow channel 18 is concave on the cooling side of the monopolar plate to form a guide protrusion on the reaction side of the monopolar plate.

[0052] The coolant passes through the sealant grooves of the anode and cathode plates and the diverter protrusions 17 supporting the sealant grooves to form a coolant flow port similar to a bridge hole structure. The coolant flows through the bridge hole structures on the left into the staggered flow field area of ​​the anode and cathode plates, and then passes through the cavity formed by the two plates in the flat channel area to dissipate the heat of the chemical reaction. After the heat is dissipated, the coolant flows through the staggered area on the right and out of the bipolar plate.

[0053] The diverter protrusion 17 in this embodiment is arranged between the first coolant interface 7 and the coolant channel 18, and between the second coolant interface 8 and the coolant channel 18, for diverting the coolant and supporting the bipolar plate.

[0054] The minimum distance between the edge of the diverter protrusion 17 between the first coolant interface 7 and the coolant flow channel 18 and the edge of the first coolant interface 7 is L1, and the minimum distance between the edge of the diverter protrusion 17 between the second coolant interface 8 and the coolant flow channel 18 and the edge of the second coolant interface 8 close to the coolant flow channel 18 is L2, wherein L1 is greater than L2, so that after the two monopolar plates form a bipolar plate, the diverter protrusion 17 located on the cathode plate 1 can be misaligned with the diverter protrusion 17 located on the anode plate 2, which can play an effective supporting role and an effective diversion role.

[0055] In one embodiment, the first oxygen interface 3 is the oxygen inlet, the second oxygen interface 4 is the oxygen outlet, the first hydrogen interface 5 is the hydrogen inlet, the second hydrogen interface 6 is the hydrogen outlet, the first coolant interface 7 is the coolant inlet, and the second coolant interface 8 is the coolant outlet.

[0056] In one of the embodiments, the oxygen inlet is a special-shaped structure, specifically, a rectangular interface is cut at the corners of the outer edge to form a cutting structure. The cutting structure can reduce the area of ​​the rectangular interface and make the positioning holes at the four corners arranged closer to the edge of the plate, so that the outer peripheral size of the bipolar plate is smaller, which helps to reduce the overall volume and area of ​​the bipolar plate.

[0057] In another embodiment, the oxygen inlet is a rectangular structure, so that the oxygen inlet structure is regular, and only one direction of mechanical movement needs to be controlled during welding. The welding laser light is stable and not prone to jitter, thereby improving the welding qualification rate.

[0058] The structures of the hydrogen inlet and the hydrogen outlet are similar to this and will not be described in detail here.

[0059] According to an embodiment of the present application, a fuel cell includes a bipolar plate, which is the bipolar plate described above.

[0060] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0061] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A bipolar plate, characterized in that: The invention comprises a cathode plate (1) and an anode plate (2), wherein the cathode plate (1) and the anode plate (2) are monopolar plates with the same structure, wherein the cathode plate (1) comprises a first oxygen interface (3), a second oxygen interface (4), a first hydrogen interface (5), a second hydrogen interface (6), a first coolant interface (7) and a second coolant interface (8), wherein the first coolant interface (7) is symmetrical about the longitudinal midplane of the cathode plate (1), the second coolant interface (8) is centrally symmetrical with the first coolant interface (7), the first hydrogen interface (5) and the first oxygen interface (3) are symmetrical about the transverse midplane of the cathode plate (1), and the second hydrogen interface (6) and the second oxygen interface (4) are symmetrical about the transverse midplane of the cathode plate (1); The cathode plate (1) is provided with an oxygen flow channel (9), a first end of the oxygen flow channel (9) is in communication with the first oxygen interface (3), a second end of the oxygen flow channel (9) is in communication with the second oxygen interface (4), and the oxygen flow channel (9) is in a zigzag shape; the cathode plate (1) comprises a reaction side, the reaction side is provided with a plurality of flow guiding protrusions, and the oxygen flow channel (9) is formed between adjacent flow guiding protrusions; wherein the plurality of flow guiding protrusions comprises a first flow guiding protrusion and a second flow guiding protrusion, the first flow guiding protrusion comprises a first zigzag segment (10), a second zigzag segment (11) and a first zigzag segment (12). The second flow-guiding protrusion comprises a first partitioning section (13) and a second partitioning section (14); the first folding line section (10) is connected to the first oxygen interface (3); the first partitioning section (13) is located between two adjacent second folding line sections (11), and divides the oxygen flow channel (9) between the two adjacent second folding line sections (11) into two; the second partitioning section (14) is located between two adjacent third folding line sections (12), and divides the oxygen flow channel (9) between the two adjacent third folding line sections (12) into two.

2. The bipolar plate according to claim 1, characterized in that: The first hydrogen interface (5) and the second oxygen interface (4) are symmetrical about the longitudinal midplane of the cathode plate (1).

3. The bipolar plate according to claim 1, characterized in that: The oxygen flow channel (9) is symmetrical about the center of the cathode plate (1).

4. The bipolar plate according to claim 1, characterized in that: The cathode plate (1) comprises a cooling side.

5. The bipolar plate according to claim 1, characterized in that: The plurality of guide protrusions further include a third guide protrusion (15), wherein the third guide protrusion (15) is arranged between the third fold line segment (12) and the second partition segment (14), and divides the oxygen flow channel (9) between the third fold line segment (12) and the second partition segment (14) into two.

6. The bipolar plate according to claim 5, characterized in that: The oxygen flow channels (9) between adjacent first fold line segments (10), the oxygen flow channels (9) between the first partition segment (13) and the second fold line segment (11), and the oxygen flow channels (9) between the third fold line segment (12) and the second partition segment (14) have the same width.

7. The bipolar plate according to claim 6, characterized in that: The width of the oxygen flow channel (9) is the same as the width of the first flow guiding protrusion, the second flow guiding protrusion and the third flow guiding protrusion (15).

8. The bipolar plate according to claim 7, characterized in that: An angle α is formed between the end edge of the first fold line segment (10) and the end edge of the first partition segment (13), wherein α=arccos1 / 3.

9. The bipolar plate according to claim 8, characterized in that: The first fold line segment (10), the third fold line segment (12), the second partition segment (14) and the third flow guiding protrusion (15) are parallel to each other, and the second fold line segment (11) and the first partition segment (13) are parallel to each other.

10. The bipolar plate according to claim 1, characterized in that: On the reaction side of the cathode plate (1), a sealing rubber groove (16) is provided around the first hydrogen interface (5), the second hydrogen interface (6), the first oxygen interface (3), the second oxygen interface (4), the first coolant interface (7) and the second coolant interface (8).

11. The bipolar plate according to claim 4, characterized in that: The oxygen flow channels (9) between the second fold line segments (11) on the cooling side of the cathode plate (1) are cross-matched with the oxygen flow channels (9) between the second fold line segments (11) on the cooling side of the anode plate (2).

12. A fuel cell, characterized in that: It comprises a bipolar plate, characterized in that the bipolar plate is the bipolar plate according to any one of claims 1 to 11.

Images