Bipolar plate of fuel cell

Abstract

The utility model discloses a fuel cell bipolar plate which comprises a bipolar plate body formed by pressing an anode plate and a cathode plate and a diversion area arranged on the bipolar plate body, the diversion area is provided with an inlet and an outlet, and the fuel cell bipolar plate further comprises a reinforcing structure connected with the diversion area to increase the strength of the diversion area; according to the bipolar plate, the reinforcing ribs are additionally arranged at the air inlet structure of the flow guide area, so that the strength of the air inlet structure is improved, the pressure bearing capacity of the bipolar plate is effectively improved, deformation of the bipolar plate under the action of pressure is reduced, the service life of the bipolar plate is prolonged, the maintenance requirement is reduced, meanwhile, the risk of gas leakage caused by deformation of the bipolar plate is reduced, and the service life of the bipolar plate is prolonged. Therefore, the safety of the fuel cell is greatly improved, the stable gas inlet structure is beneficial to more uniform distribution of reaction gas and cooling liquid, and the performance of the fuel cell can be improved.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and in particular to a fuel cell bipolar plate. Background Technology

[0002] In the field of hydrogen-oxygen fuel cell technology, bipolar plates, as one of the core structures of the fuel cell stack, undertake multiple functions, including conducting electricity, separating reactant gases, and supporting the stack. The design of the bipolar plate's inlet structure is crucial to the performance and stability of the fuel cell. However, existing bipolar plate technologies have certain limitations in their inlet structures. For example, under gas pressure, insufficient strength can easily cause deformation of the inlet structure, affecting the fuel cell's sealing and the uniform distribution of reactant gases. This can also lead to bipolar plate material fatigue, reducing the battery's lifespan. Furthermore, an inadequately strong inlet structure requires frequent maintenance and replacement, increasing the fuel cell's operating costs and posing safety hazards. Utility Model Content

[0003] To address the shortcomings of the existing technology, the technical problem this invention aims to solve is to provide a fuel cell bipolar plate, with particular attention to the strength of the air intake structure. By adding reinforcing ribs to the air intake structure, the pressure-bearing capacity of the bipolar plate is effectively improved, and deformation under pressure is reduced, thereby enhancing the performance and safety of the fuel cell.

[0004] To solve the above-mentioned technical problems, the present invention provides a technical solution: a fuel cell bipolar plate, comprising a bipolar plate body formed by pressing an anode plate and a cathode plate together, and a flow guiding region disposed on the bipolar plate body, the flow guiding region having an inlet and an outlet, and further comprising a reinforcing structure connected to the flow guiding region to increase its strength.

[0005] Furthermore, the flow guiding area includes a plurality of flow channels; the reinforcing structure includes reinforcing beams arranged along the arrangement direction of the plurality of flow channels.

[0006] Furthermore, the reinforcing structure also includes connecting beams distributed outside one end of the flow guide area along the arrangement direction of the plurality of flow channels, the connecting beams being connected to the bipolar plate body; the reinforcing beams are configured as a plurality of ones, the plurality of reinforcing beams being distributed at intervals between the connecting beams and the flow guide area along the arrangement direction of the plurality of flow channels, and each of the reinforcing beams being connected to both the connecting beams and the flow guide area.

[0007] Furthermore, the reinforcing beam includes a first reinforcing rib connected to one end edge of the anode plate located in the flow guiding area, and a second reinforcing rib connected to one end edge of the cathode plate located in the flow guiding area. The ends of the first and second reinforcing ribs away from the flow guiding area are stacked together and connected to the connecting beam.

[0008] Furthermore, the connecting beam includes a first connecting piece connected to the first reinforcing rib and a second connecting piece connected to the second reinforcing rib, both the first connecting piece and the second connecting piece being connected to the bipolar plate body.

[0009] Furthermore, each of the flow channels includes a first wall surface formed by pressing the anode plate and a second wall surface formed by pressing the cathode plate. The first wall surface and the second wall surface are both semi-circular arc-shaped to cooperate in enclosing and forming a flow channel. The first reinforcing rib is connected to at least one of the first wall surfaces, and the second reinforcing rib is connected to at least one of the second wall surfaces.

[0010] Furthermore, each of the flow channels includes a first wall surface formed by pressing the anode plate and a second wall surface formed by pressing the cathode plate. The first wall surface and the second wall surface are both semi-circular arc-shaped to cooperate in enclosing and forming a flow channel. One end of several first wall surfaces is commonly formed with a first extension piece. The first reinforcing rib is disposed on the side of the first extension piece away from the first wall surface. One end of several second wall surfaces is commonly formed with a second extension piece. The second reinforcing rib is disposed on the side of the second extension piece away from the second wall surface.

[0011] Furthermore, the bipolar plate body has a first working area for air to pass through, a second working area for hydrogen to pass through, and a third working area for coolant to pass through. The first working area, the second working area, and the third working area all include a cavity for introducing gas or liquid and a flow guiding area. The cavity is located at the inlet of the flow guiding area, and the reinforcing structure is disposed in the flow guiding areas of the first working area and the second working area.

[0012] Furthermore, the first work area, the second work area, and the third work area are arranged in parallel and spaced apart.

[0013] Furthermore, the reinforcing structure is disposed at one end of the flow guide area of ​​the first working area near its cavity, and also disposed at one end of the flow guide area of ​​the second working area near its cavity.

[0014] The bipolar plate of this utility model for fuel cells has at least the following beneficial effects: the addition of reinforcing ribs to the air intake structure in the flow guide area enhances the strength of the air intake structure, effectively improves the pressure-bearing capacity of the bipolar plate, reduces the deformation of the bipolar plate under pressure, extends the service life of the bipolar plate, reduces maintenance requirements, and reduces the risk of gas leakage caused by bipolar plate deformation, greatly improving the safety of the fuel cell. Moreover, such a stable air intake structure helps to distribute the reactant gas and coolant more evenly, which can improve the performance of the fuel cell. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a fuel cell bipolar plate according to a first embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of a fuel cell bipolar plate according to a first embodiment of the present invention;

[0018] Figure 3 for Figure 1 A partial structural diagram at point A in the middle;

[0019] Figure 4 This is a partial cross-sectional view of a first embodiment of the fuel cell bipolar plate of this utility model;

[0020] Figure 5 for Figure 4 A schematic diagram of the local structure at point B;

[0021] Figure 6 This is a schematic diagram of the structure of the fuel cell bipolar plate of the present invention, in embodiment two.

[0022] Figure 7 This is a schematic diagram of the cathode plate in Embodiment 2 of the fuel cell bipolar plate of this utility model;

[0023] Figure 8 for Figure 6 A schematic diagram of the local structure at point C.

[0024] The meanings of the labels in the attached diagram are as follows:

[0025] Bipolar plate body 1, anode plate 11, cathode plate 12, first working area 13, first cavity 131, first flow guiding area 132, first flow channel 1321a, 1321b, first wall surface 13211a, 13211b, second wall surface 13212a, 13212b, first extension plate 1322, second extension plate 1323, first outlet 133, second working area 14, second cavity 141, second flow guiding area 142, second flow channel 1421a, 1421b, second outlet 143, third working area 15, third cavity 151, third flow guiding area 152, third flow channel 1521;

[0026] Reinforcing structures 2a, 2b; reinforcing beams 21a, 21b; first reinforcing ribs 211a, 211b; first reinforcing section 2111; first bending section 2112; first connecting section 2113; second reinforcing ribs 212a, 212b; second reinforcing section 2121; second bending section 2122; second connecting section 2123; connecting beams 22a, 22b; first connecting piece 221; second connecting piece 222. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Example 1:

[0029] Please refer to Figure 1 and Figure 2 The present invention discloses a fuel cell bipolar plate, comprising a bipolar plate body 1 formed by pressing an anode plate 11 and a cathode plate 12 together, and a reinforcing structure 2a disposed on the bipolar plate body 1. The bipolar plate body 1 has a first working area 13 for air passage, a second working area 14 for hydrogen passage, and a third working area 15 for coolant passage, wherein the first working area 13, the second working area 14, and the third working area 15 are arranged in parallel and spaced apart. Each of the first working area 13, the second working area 14, and the third working area 15 includes a cavity for introducing gas or liquid and a flow guiding area. The reinforcing structure 2a is disposed in the flow guiding areas of the first working area 13 and the second working area 14 to increase their strength.

[0030] The first working area 13 is located on the bipolar plate body 1 near one of its lateral ends. The first working area 13 includes a first cavity 131 for introducing air and a first flow guiding area 132 for guiding air. The first flow guiding area 132 is located on one side of the first cavity 131 and includes a plurality of first flow channels 1321a formed between the cathode plate 12 and the anode plate 11. Specifically, each first flow channel 1321a includes a first wall surface 13211a formed by pressing the anode plate 11 and a second wall surface 13212a formed by pressing the cathode plate 12. The first wall surface 13211a and the second wall surface 13212a are both semi-circular arc-shaped and have openings facing each other. The first wall surface 13211a and the second wall surface 13212a cooperate to enclose and form a first flow channel 1321a. A first extension piece 1322 is formed at one end of several first wall surfaces 13211a, and a second extension piece 1323 is formed at one end of several second wall surfaces 13212a. The space between the first extension piece 1322 and the second extension piece 1323 is connected to several first flow channels 1321a, and this space is also connected to the first cavity 131, so that air entering the first cavity 131 can be introduced into several first flow channels 1321a. Several first outlet holes 133 are formed on the cathode plate 12 at positions corresponding to the ends of several first flow channels 1321a away from the first cavity 131. Several first flow channels 1321a are connected to several first outlet holes 133, so that air can flow out from them.

[0031] The second working area 14 is located on the bipolar plate body 1 at a laterally opposite end away from the first working area 13. The second working area 14 includes a second cavity 141 for introducing hydrogen and a second flow guiding area 142 for guiding hydrogen. The second flow guiding area 142 is located on one side of the second cavity 141 (in the illustrated embodiment, it is in the same orientation as the first flow guiding area 132 relative to the first cavity 131). The second flow guiding area 142 includes a plurality of second flow channels 1421a formed between the cathode plate 12 and the anode plate 11. Except for the outlet position of the second flow channel 1421a, the other structures of the second flow channel 1421a are the same as the specific structure of the first flow channel 1321a, and therefore will not be described in detail here. The outlet of the second flow channel 1421a is located on the anode plate 11. The anode plate 11 has a plurality of second outlet holes 143 that pass through the anode plate 11 at a position corresponding to one end of the plurality of second flow channels 1421a away from the second cavity 141. The plurality of second flow channels 1421a are connected to the plurality of second outlet holes 143 so that hydrogen can flow out from them.

[0032] The third working area 15 is located on the bipolar plate body 1 at a position between the first working area 13 and the second working area 14. The third working area 15 includes a third cavity 151 for introducing coolant and a third flow guiding area 152 for guiding coolant. The third flow guiding area 152 is located on one side of the third cavity 151 (in the illustrated embodiment, it is in the same orientation as the first flow guiding area 132 relative to the first cavity 131). The third flow guiding area 152 includes a plurality of third flow channels 1521 formed between the cathode plate 12 and the anode plate 11. The formation principle and structure of the third flow channels 1521 are the same as those of the first flow channels 1321a and the second flow channels 1421a. The difference is that the third flow channels 1521 extend away from the third cavity 151 (the arrangement of coolant flow channel outlets is a relatively mature prior art, not shown in the figures of this case), so that the coolant can flow through the bipolar plate body 1 and then flow out.

[0033] The reinforcing structures 2a are respectively disposed at one end of the first flow guiding area 132 near the first cavity 131 and at one end of the second flow guiding area 142 near the second cavity 141. The connection between the reinforcing structure 2a and the first flow guiding area 132 is the same as the connection between the reinforcing structure 2a and the second flow guiding area 142. The following will refer to the attached diagram. Figure 3 , Figure 4 and Figure 5 The structure of the reinforcing structure 2a disposed in the first flow guiding region 132 will be further described. It should be emphasized that the reinforcing structure 2a can also be disposed in the third flow guiding region 152 near the end of the third cavity 151.

[0034] The reinforcing structure 2a includes reinforcing beams 21a arranged in the same direction as the first flow channels 1321a, and connecting beams 22a distributed outside one end of the flow guiding area along the same direction as the first flow channels 1321a. A plurality of reinforcing beams 21a are configured, and these beams are spaced apart along the same direction as the first flow channels 1321a on the side where the first flow guiding area 132 connects to the first cavity 131. Each of the reinforcing beams 21a includes a first reinforcing rib 211a connected to one end edge of the anode plate 11 located in the first flow guiding region 132, and a second reinforcing rib 212a connected to one end edge of the cathode plate 12 located in the first flow guiding region 132. Specifically, the first reinforcing rib 211a is integrally formed on the side of the first extension piece 1322 near the first cavity 131, and the second reinforcing rib 212a is integrally formed on the side of the second extension piece 1323 near the first cavity 131. The ends of the first reinforcing rib 211a and the second reinforcing rib 212a away from the flow guiding region are pressed together and stacked. Furthermore, each of the first reinforcing ribs 211a includes a first reinforcing section 2111 located in the same plane as the first extension piece 1322 and a first bent section 2112 perpendicular to the first reinforcing section 2111. The first bent section 2112 bends and extends from the end of the first reinforcing section 2111 toward the cathode plate 12. The cooperation between the first reinforcing section 2111 and the first bending section 2112 prevents a sharp edge from forming at the connection edge between the first reinforcing rib 211a and the anode plate 11, thus avoiding stress concentration at the sharp edge and preventing breakage and separation between the first reinforcing rib 211a and the anode plate 11. The cooperation between the second reinforcing rib 212a and the cathode plate 12 described below follows the same principle. The end of the first bending section 2112 away from the first reinforcing section 2111 also has a first connecting section 2113, which is parallel to the first reinforcing section 2111. Each of the second reinforcing ribs 212a includes a second reinforcing segment 2121 located in the same plane as the second extension piece 1323 and a second bent segment 2122 perpendicular to the second reinforcing segment 2121. The second bent segment 2122 bends and extends from the end of the second reinforcing segment 2121 toward the anode plate 11. The end of the second bent segment 2122 away from the second reinforcing segment 2121 also has a second connecting segment 2123, which is parallel to the second reinforcing segment 2121. When the ends of the first reinforcing rib 211a and the second reinforcing rib 212a away from the flow guiding area are pressed together, specifically, the first connecting segment 2113 and the second connecting segment 2123 are pressed together and stacked.

[0035] The connecting beam 22a is disposed at one end of the plurality of reinforcing beams 21a away from the first flow guiding area 132 to connect the plurality of reinforcing beams 21a together. Both ends of the connecting beam 22a are also connected to the bipolar plate body 1. Specifically, the connecting beam 22a includes a first connecting piece 221 connected to the first reinforcing rib 211a and a second connecting piece 222 connected to the second reinforcing rib 212a. The first connecting piece 221 is connected to the plurality of first connecting segments 2113 and is located in the same plane as the plurality of first connecting segments 2113. The two ends of the length direction of the first connecting piece 221 are respectively fixedly connected to the two side walls of the anode plate 11 corresponding to the first cavity 131. The second connecting piece 222 is connected to the plurality of second connecting segments 2123 and is located in the same plane as the plurality of second connecting segments 2123. The two ends of the length direction of the second connecting piece 222 are respectively fixedly connected to the two side walls of the cathode plate 12 corresponding to the first cavity 131. The first connecting piece 221 and the second connecting piece 222 are pressed together to form the connecting beam 22a.

[0036] The structural configuration and working principle of the reinforcing structure 2a in the second guide zone 142 and the third guide zone 152 are exactly the same as those of the reinforcing structure 2a in the first guide zone 132, so they will not be described in detail here.

[0037] The operation of the fuel cell bipolar plate of this utility model in Embodiment 1 is as follows: During use, air enters through the first cavity 131 and flows into several first flow channels 1321a, then exits through several first outlet holes 133 on the cathode plate 12; hydrogen enters through the second cavity 141 and flows into several second flow channels 1421a, then exits through several second outlet holes 143 on the anode plate 11; cooling water enters through the third cavity 151 and flows into several third flow channels 1521, then exits from the outlet of the third flow channels 1521. During this process, the reinforcing beam 21a consistently supports the upper and lower walls of the first flow channels 1321a, the second flow channels 1421a, and the third flow channels 1521 to prevent deformation due to external pressure. It should be emphasized that the reinforcing beam 21a and the connecting beam 22a are integrally formed with the anode plate 11 and the cathode plate 12.

[0038] Based on the above embodiments, the fuel cell bipolar plate of this utility model has the following beneficial effects: reinforcing ribs are added to the air intake structure in the flow guide area, which improves the strength of the air intake structure, effectively enhances the pressure bearing capacity of the bipolar plate, reduces the deformation of the bipolar plate under pressure, extends the service life of the bipolar plate, reduces maintenance requirements, and reduces the risk of gas leakage caused by bipolar plate deformation, greatly improving the safety of the fuel cell. Moreover, such a stable air intake structure helps to distribute the reactant gas and coolant more evenly, which can improve the performance of the fuel cell.

[0039] Example 2:

[0040] Please refer to Figure 6 and Figure 7 This embodiment has a first working area 13, a second working area 14, a third working area 15, and a reinforcing structure 2b that are the same or similar in structure or function to those in Embodiment 1.

[0041] The first working area 13 is located on the bipolar plate body 1 near one of its lateral ends. The first working area 13 includes a first cavity 131 for introducing air and a first flow guiding area 132 for guiding air. The first flow guiding area 132 is located on one side of the first cavity 131 and includes a plurality of first flow channels 1321b formed between the cathode plate 12 and the anode plate 11. Specifically, each first flow channel 1321b includes a first wall surface 13211b formed by pressing the anode plate 11 and a second wall surface 13211b formed by pressing the cathode plate 12. The first wall surface 13211b and the second wall surface 13211b are both semi-circular arc-shaped and have openings facing each other. The first wall surface 13211b and the second wall surface 13211b cooperate to enclose and form a first flow channel 1321b. The cathode plate 12 has a plurality of first outlet holes 133 at a position corresponding to one end of the plurality of first flow channels 1321b away from the first cavity. The plurality of first flow channels 1321b are connected to the plurality of first outlet holes 133 so that air can flow out from them.

[0042] The second working area 14 is located on the bipolar plate body 1 at a laterally opposite end away from the first working area 13. The second working area 14 includes a second cavity 141 for introducing hydrogen and a second flow guiding area 142 for guiding hydrogen. The second flow guiding area 142 is located on one side of the second cavity 141 (in the illustrated embodiment, it is in the same orientation as the first flow guiding area 132 relative to the first cavity 131). The second flow guiding area 142 includes a plurality of second flow channels 1421b formed between the cathode plate 12 and the anode plate 11. Except for the outlet position of the second flow channel 1421b, the other structures of the second flow channel 1421b are the same as the specific structure of the first flow channel 1321b, and therefore will not be described in detail here. The outlet of the second flow channel 1421b is located on the anode plate 11. The anode plate 11 has a plurality of second outlet holes 143 that pass through the anode plate 11 at a position corresponding to one end of the plurality of second flow channels 1421b away from the second cavity 141. The plurality of second flow channels 1421b are connected to the plurality of second outlet holes 143 so that hydrogen can flow out from them.

[0043] The reinforcing structure 2b is respectively disposed at one end of the first flow guiding area 132 near the first cavity 131 and at one end of the second flow guiding area 142 near the second cavity 141. The connection between the reinforcing structure 2b and the first flow guiding area 132 is the same as the connection between the reinforcing structure 2b and the second flow guiding area 142.

[0044] Taking the case where the reinforcing structure 2b is disposed in the first flow guiding area 132 as an example, the reinforcing structure 2b includes a plurality of reinforcing beams 21b and connecting beams 22b. The arrangement direction of the plurality of reinforcing beams 21b and the connecting beams 22b is consistent with the specific structure in Embodiment 1. The difference is that the first reinforcing rib 211b and the second reinforcing rib 212b are directly connected to the first flow channel 1321b. Please refer to... Figure 8Specifically, each of the first reinforcing ribs 211b is connected to at least one of the first wall surfaces 13211b, and each of the second reinforcing ribs 212b is connected to at least one of the second wall surfaces 13211b. In this embodiment, each of the first reinforcing ribs 211b is connected to the first wall surface 13211b of two adjacent first flow channels 1321b. The first reinforcing rib 211b is disposed at a position corresponding to the two adjacent first wall surfaces 13211b, and the first reinforcing rib 211b is connected to the adjacent half of the two first wall surfaces 13211b. Then, a plurality of second reinforcing ribs 212b are disposed in a one-to-one correspondence with a plurality of first reinforcing ribs 211b. That is, each of the second reinforcing ribs 212b is connected to the second wall surface 13211b of two adjacent first flow channels 1321b. The second reinforcing rib 212b is disposed at a position corresponding to the two adjacent second wall surfaces 13211b, and the second reinforcing rib 212b is connected to the adjacent half of the two second wall surfaces 13211b. Thus, the first reinforcing rib 211b and the second reinforcing rib 212b can provide strong stabilization for the two directly connected first flow channels 1321b, and also provide strong stabilization for other flow channels adjacent to the two first flow channels 1321b. In other embodiments, each first reinforcing rib 211b may be connected to only one first wall surface 13211b, and each second reinforcing rib 212b may also be connected to only one second wall surface 13211b. However, while the first reinforcing rib 211b and the second reinforcing rib 212b can provide strong stabilization for a directly connected first flow channel 1321b, the reinforcement effect is not as good as in this embodiment. Alternatively, each first reinforcing rib 211b may be connected to multiple first wall surfaces 13211b, and each second reinforcing rib 212b may also be connected to multiple second wall surfaces 13211b. However, such a connection method may result in the air intake of some first flow channels 1321b being slightly less than that of other first flow channels 1321b. Therefore, the implementation method of this embodiment is a highly preferred embodiment.

[0045] The structural configuration and working principle of the reinforcing structure 2b in the second flow guiding region 142 are exactly the same as those of the reinforcing structure 2b in the first flow guiding region 132, so they will not be described in detail here. It should be emphasized that the reinforcing beam 21b and the connecting beam 22b in this embodiment are also integrally formed with the anode plate 11 and the cathode plate 12.

[0046] Based on the above embodiments, the fuel cell bipolar plate of this utility model has the following beneficial effects: the first and second extension plates are removed from the original bipolar plate body structure. This change makes the bipolar plate body lighter, saving materials and reducing the pressure on each bipolar plate when multiple bipolar plates are stacked. At the same time, this increases the cross-section of the cavity for introducing gas or coolant without increasing the size of the bipolar plate, increasing the amount of gas or coolant entering, improving the performance of the bipolar plate, and thus further improving the performance of the fuel cell.

Claims

1. A fuel cell bipolar plate, comprising a bipolar plate body formed by pressing an anode plate and a cathode plate together, and a flow guiding region disposed on the bipolar plate body, the flow guiding region having an inlet and an outlet, characterized in that: It also includes a reinforcing structure connected to the flow guiding area to increase its strength; the flow guiding area includes a plurality of flow channels; the reinforcing structure includes reinforcing beams arranged along the arrangement direction of the plurality of flow channels.

2. The fuel cell bipolar plate as described in claim 1, characterized in that: The reinforcing structure further includes a connecting beam (22) distributed outside one end of the flow guide area along the arrangement direction of the plurality of flow channels, the connecting beam being connected to the bipolar plate body; the reinforcing beam (21) is configured as a plurality of beams, the plurality of beams being distributed at intervals between the connecting beam and the flow guide area along the arrangement direction of the plurality of flow channels, and each beam being connected to both the connecting beam and the flow guide area.

3. The fuel cell bipolar plate as described in claim 2, characterized in that: The reinforcing beam includes a first reinforcing rib connected to one end edge of the anode plate located in the flow guiding area, and a second reinforcing rib connected to one end edge of the cathode plate located in the flow guiding area. The ends of the first and second reinforcing ribs away from the flow guiding area are stacked together and connected to the connecting beam.

4. The fuel cell bipolar plate as described in claim 3, characterized in that: The connecting beam includes a first connecting piece connected to the first reinforcing rib and a second connecting piece connected to the second reinforcing rib, and both the first connecting piece and the second connecting piece are connected to the bipolar plate body.

5. The fuel cell bipolar plate as described in claim 4, characterized in that: Each of the flow channels includes a first wall surface formed by pressing the anode plate and a second wall surface formed by pressing the cathode plate. The first wall surface and the second wall surface are both semi-circular arc-shaped to cooperate in enclosing and forming a flow channel. The first reinforcing rib is connected to at least one of the first wall surfaces, and the second reinforcing rib is connected to at least one of the second wall surfaces.

6. The fuel cell bipolar plate as described in claim 4, characterized in that: Each of the flow channels includes a first wall surface formed by pressing the anode plate and a second wall surface formed by pressing the cathode plate. The first wall surface and the second wall surface are both semi-circular arc-shaped to cooperate in enclosing and forming a flow channel. One end of several first wall surfaces is commonly formed with a first extension piece. A first reinforcing rib is provided on the side of the first extension piece away from the first wall surface. One end of several second wall surfaces is commonly formed with a second extension piece. A second reinforcing rib is provided on the side of the second extension piece away from the second wall surface.

7. The fuel cell bipolar plate as described in claim 1, characterized in that: The bipolar plate body has a first working area for air to pass through, a second working area for hydrogen to pass through, and a third working area for coolant to pass through. The first working area, the second working area, and the third working area all include a cavity for introducing gas or liquid and a flow guiding area. The cavity is located at the inlet of the flow guiding area. The reinforcing structure is disposed in the flow guiding areas of the first working area and the second working area.

8. The fuel cell bipolar plate as described in claim 7, characterized in that: The first work area, the second work area, and the third work area are arranged in parallel and spaced apart.

9. The fuel cell bipolar plate as described in claim 7, characterized in that: The reinforcing structure is disposed at one end of the flow guide area of ​​the first working area near its cavity, and also at one end of the flow guide area of ​​the second working area near its cavity.

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