Single-layer bipolar plate and electric pile

Abstract

The invention provides a single-layer bipolar plate and an electric pile, the single-layer bipolar plate is provided with two through holes penetrating through the front surface and the back surface of the single-layer bipolar plate, one through hole is a hydrogen inlet, and the other through hole is a hydrogen outlet; a hydrogen cavity and a main sealing protrusion are arranged on the front side of the single-layer bipolar plate, the hydrogen cavity is communicated with the hydrogen inlet and the hydrogen outlet, and the main sealing protrusion surrounds the hydrogen cavity and can be tightly attached to the MEA to seal the hydrogen cavity. An air cavity, an inlet sealing bulge and an outlet sealing bulge are arranged on the reverse side of the single-layer bipolar plate, the inlet sealing bulge surrounds the periphery of the hydrogen inlet and can be tightly attached to the MEA so as to hermetically isolate the air cavity from the hydrogen inlet, and the outlet sealing bulge surrounds the periphery of the hydrogen outlet and can be tightly attached to the MEA so as to hermetically isolate the air cavity from the hydrogen outlet. The single-layer bipolar plate is low in cost, can reliably support the MEA and is uniform in flow field.

Description

Technical Field

[0001] The present application relates to the technical field of air-cooled fuel cells, and in particular to a single-layer bipolar plate and a fuel cell stack including the single-layer bipolar plate. Background Art

[0002] The bipolar plate of the existing air-cooled fuel cell is a double-layer structure, generally formed by welding two metal plates or bonding two graphite plates, one of which is the anode plate and the other is the cathode plate.

[0003] The bipolar plates with double-layer structures use a lot of materials and need to be assembled, so the cost is relatively high. Therefore, how to reduce the cost of bipolar plates is a technical problem that needs to be solved by those skilled in the art. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a single-layer bipolar plate, which is provided with two through holes running through the front and back sides thereof, wherein one through hole is a hydrogen inlet and the other through hole is a hydrogen outlet; a hydrogen cavity and a main sealing protrusion are provided on the front side of the single-layer bipolar plate, the hydrogen cavity is communicated with the hydrogen inlet and the hydrogen outlet, the main sealing protrusion surrounds the hydrogen cavity and can be tightly attached to the MEA to seal the hydrogen cavity; an air cavity, an inlet sealing protrusion and an outlet sealing protrusion are provided on the back side of the single-layer bipolar plate, the inlet sealing protrusion surrounds the hydrogen inlet and can be tightly attached to the MEA to seal and isolate the air cavity from the hydrogen inlet, and the outlet sealing protrusion surrounds the hydrogen outlet and can be tightly attached to the MEA to seal and isolate the air cavity from the hydrogen outlet.

[0005] An embodiment of a single-layer bipolar plate, wherein the single-layer bipolar plate is provided with a corrugated structure, wherein the corrugated structure forms peaks and corrugated grooves on the front side of the single-layer bipolar plate and troughs and corrugated grooves on the back side, and the peaks and troughs of the corrugated structure can support the MEA.

[0006] In one embodiment of a single-layer bipolar plate, the main sealing protrusion forms a main groove on the reverse side of the single-layer bipolar plate, and the groove cavity of the main groove is a part of the air cavity; the corrugated structure includes a surrounding corrugated structure, and the surrounding corrugated structure surrounds the main groove, and the reverse side corrugated groove of the surrounding corrugated structure is connected to the main groove.

[0007] In one embodiment of a single-layer bipolar plate, the inlet sealing protrusion and the outlet sealing protrusion respectively form an inlet groove and an outlet groove on the front side of the single-layer bipolar plate, and the groove cavity of the inlet groove and the groove cavity of the outlet groove are part of the hydrogen cavity; the corrugated structure includes an inlet corrugated structure and an outlet corrugated structure; the inlet corrugated structure surrounds the hydrogen inlet and is located between the hydrogen inlet and the inlet groove, and the corrugated groove on the front side of the inlet corrugated structure connects the hydrogen inlet and the inlet groove; the outlet corrugated structure surrounds the hydrogen outlet and is located between the hydrogen outlet and the outlet groove, and the corrugated groove on the front side of the outlet corrugated structure connects the hydrogen outlet and the outlet groove.

[0008] An embodiment of a single-layer bipolar plate, the corrugated structure includes an intermediate corrugated structure, the intermediate corrugated structure is arranged between the inlet groove and the outlet groove, the corrugations of the intermediate corrugated structure are arranged in sequence on the line connecting the center of the hydrogen inlet and the center of the hydrogen outlet, the groove cavity of the corrugated groove on the front side of the intermediate corrugated structure becomes a hydrogen channel, the groove cavity of the corrugated groove on the back side of the intermediate corrugated structure becomes an air channel, a connecting groove is provided at the crest of the intermediate corrugated structure, the inlet groove and the outlet groove are connected through the connecting groove and the corrugated groove on the front side of the intermediate corrugated structure, and the depth of the connecting groove is less than the depth of the corrugated groove on the front side of the intermediate corrugated structure.

[0009] In one embodiment of the single-layer bipolar plate, the single-layer bipolar plate is a metal stamping bipolar plate.

[0010] In addition, the present application also provides a fuel cell stack, which includes a first bipolar plate, a second bipolar plate and an MEA, wherein the MEA is tightly attached between the back side of the first bipolar plate and the front side of the second bipolar plate or tightly attached between the front side of the first bipolar plate and the back side of the second bipolar plate, and the first bipolar plate and the second bipolar plate are single-layer bipolar plates as described in any of the above items.

[0011] In one embodiment of the fuel cell stack, the first bipolar plate and the second bipolar plate are provided with the above-mentioned corrugated structure, and the first bipolar plate and the second bipolar plate on both sides of the same MEA, the crest of the corrugated structure of one of them offsets the trough of the corrugated structure of the other one across the MEA.

[0012] In one embodiment of the stack, the corrugated structure includes the above-mentioned four-sided corrugated structure, the first bipolar plate and the second bipolar plate on both sides of the same MEA, the four-sided corrugated structure of one of them is separated from the MEA and abuts against the four-sided corrugated structure and the main sealing protrusion of the other one, and the width is equal to the sum of the widths of the four-sided corrugated structure and the main sealing protrusion of the other one; and / or,

[0013] The corrugated structure includes the above-mentioned inlet corrugated structure, the first bipolar plate and the second bipolar plate on both sides of the same MEA, the inlet corrugated structure of one of them is in contact with the inlet corrugated structure and the inlet sealing protrusion of the other one across the MEA and the width is equal to the sum of the widths of the inlet corrugated structure and the inlet sealing protrusion of the other one; and / or,

[0014] The corrugated structure includes the above-mentioned outlet corrugated structure, the first bipolar plate and the second bipolar plate on both sides of the same MEA, the outlet corrugated structure of one of them is separated from the MEA and is simultaneously abutted against the outlet corrugated structure and outlet sealing protrusion of the other one and has a width equal to the sum of the widths of the outlet corrugated structure and outlet sealing protrusion of the other one.

[0015] In one embodiment of the fuel cell stack, the corrugated structure includes the intermediate corrugated structure in the claim, the first bipolar plate and the second bipolar plate on both sides of the same MEA, the length of the corrugated grooves on the front side of the intermediate corrugated structure of one is aligned with the length of the corrugated grooves on the reverse side of the intermediate corrugated structure of the other through the MEA toward the center line.

[0016] The single-layer bipolar plate provided by the present application adopts a single-layer structure to form an air cavity and a hydrogen cavity that are independent of each other and not connected to each other, which can meet the functional requirements of the bipolar plate, and compared with the double-layer bipolar plate, it saves one layer of material and double-layer assembly process, so the cost is reduced. It can also reliably support the MEA, so that the overall strength of the stack is high, and the hydrogen flow field and air flow field are uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A partial schematic diagram of an embodiment of a battery stack provided in the present application;

[0018] Figure 2 for Figure 1 Schematic diagram of the front side of the first single-layer bipolar plate.

[0019] Figure 3 for Figure 1 Schematic diagram of the reverse side of the first single-layer bipolar plate.

[0020] Figure 4 for Figure 1 A schematic diagram of the front side of the second single-layer bipolar plate;

[0021] Figure 5 for Figure 1 A schematic diagram of the reverse side of the second single-layer bipolar plate;

[0022] Figure 6 It is a partial enlarged view of the middle corrugated structure;

[0023] Figure 7 Figure 1 A partial cross-sectional view of .

[0024] The following are the descriptions of the reference numerals:

[0025] 1-single-layer bipolar plate, 11-hydrogen inlet, 12-hydrogen outlet, 13-hydrogen cavity, 14a-main sealing protrusion, 14b-main groove, 15-air cavity, 16a-inlet sealing protrusion, 16b-inlet groove, 17a-outlet sealing protrusion, 17b-outlet groove, 18-surrounding corrugated structure, 19-inlet corrugated structure, 110-outlet corrugated structure, 111-middle corrugated structure, 112-connecting groove, 113-corner support part.

[0026] A-first single-layer bipolar plate, B-second single-layer bipolar plate, C-MEA. DETAILED DESCRIPTION

[0027] The present application provides a single-layer bipolar plate and a battery stack. In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] like Figure 1 As shown, the battery stack provided in the present application includes a first bipolar plate A, a second bipolar plate B and an MEA (Membrane Electrode Assembly, proton exchange membrane assembly, indicated by C in the figure). The first bipolar plate A, the second bipolar plate B and the MEA can be one or more. The first bipolar plate A, the MEA and the second bipolar plate B are arranged alternately one by one, and the MEA is closely attached to the reverse side of the first bipolar plate A and the front side of the second bipolar plate B or closely attached to the front side of the first bipolar plate A and the reverse side of the second bipolar plate B. Among them, the first bipolar plate A and the second bipolar plate B are both single-layer bipolar plates 1.

[0029] like Figure 2-Figure 5 As shown, the single-layer bipolar plate 1 is provided with two through holes, and the two through holes penetrate the front and back sides of the single-layer bipolar plate 1 , wherein one through hole is a hydrogen inlet 11 , and the other through hole is a hydrogen outlet 12 .

[0030] The front side of the single-layer bipolar plate 1 is provided with a hydrogen cavity 13 and a main sealing protrusion 14a. The hydrogen inlet 11 and the hydrogen outlet 12 of the hydrogen cavity 13 are connected. The main sealing protrusion 14a surrounds the hydrogen cavity 13 to form the side wall of the hydrogen cavity 13. In the application state, the main sealing protrusion 14a of the single-layer bipolar plate 1 supports the MEA and fits closely with the MEA to seal the hydrogen cavity 13, so that hydrogen can only leave from the hydrogen outlet 12 after entering the hydrogen cavity 13 from the hydrogen inlet 11.

[0031] The reverse side of the single-layer bipolar plate 1 is provided with an air cavity 15, an inlet sealing protrusion 16a and an outlet sealing protrusion 17a. The inlet sealing protrusion 16a surrounds the hydrogen inlet 11, and the outlet sealing protrusion 17a surrounds the hydrogen outlet 12. In the application state, the inlet sealing protrusion 16a of the single-layer bipolar plate 1 supports the MEA and fits closely with the MEA to seal and isolate the air cavity 15 from the hydrogen inlet 11, and the outlet sealing protrusion 17a of the single-layer bipolar plate 1 supports the MEA and fits closely with the MEA to seal and isolate the air cavity 15 from the hydrogen outlet 12, so that the air in the air cavity 15 cannot enter the hydrogen cavity 13 and the hydrogen in the hydrogen cavity 13 cannot enter the air cavity 15, so that the air cavity 15 and the hydrogen cavity 13 are independent of each other and are not connected to each other.

[0032] The single-layer bipolar plate 1 of the above structure adopts a single-layer structure to form independent and non-connected air chambers 15 and hydrogen chambers 13, which can meet the functional requirements of the bipolar plate, and compared with the double-layer bipolar plate, it saves one layer of material and double-layer assembly process, thereby reducing the cost.

[0033] In one embodiment, Figure 2-Figure 5 As shown, the single-layer bipolar plate 1 is provided with a corrugated structure. The corrugated structure forms wave crests and wave grooves on the front side of the single-layer bipolar plate 1, and wave valleys and wave grooves on the back side.

[0034] In one embodiment, Figure 2-Figure 5 As shown, the corrugated structure of the single-layer bipolar plate 1 includes a surrounding corrugated structure 18 .

[0035] like Figure 3 or Figure 5 As shown, the main sealing protrusion 14 a forms a main groove 14 b on the reverse side of the single-layer bipolar plate 1 , and the groove cavity of the main groove 14 b is a part of the air cavity 15 .

[0036] The surrounding corrugated structure 18 surrounds the main groove 14b, and the corrugations of the surrounding corrugated structure 18 are arranged in sequence along the circumference of the main groove 14b. The reverse side corrugated grooves of the surrounding corrugated structure 18 are connected to the main groove 14b, so that air can enter and exit the air cavity 15 along the reverse side corrugated grooves of the surrounding corrugated structure 18. When the surrounding corrugated structure 18 has a corner, a corner support portion 113 is provided at the corner of the surrounding corrugated structure 18.

[0037] In the application state, the peaks of the corrugated structure 18 around the single-layer bipolar plate 1 and the corner support parts 113 at the corners support the MEA located on the front side of the single-layer bipolar plate 1, and the troughs of the corrugated structure 18 around the single-layer bipolar plate 1 and the corner support parts 113 at the corners support the MEA located on the back side of the single-layer bipolar plate 1.

[0038] The above-mentioned surrounding corrugated structure 18 can guide air in and out of the air cavity 15, achieving the technical effect of optimizing the air flow field, and can serve as a supporting structure to support the MEA, achieving the technical effect of improving the overall strength of the fuel cell stack.

[0039] In one embodiment, Figure 2-Figure 5 As shown, the corrugated structure of the single-layer bipolar plate 1 includes an inlet corrugated structure 19 and an outlet corrugated structure 110 .

[0040] like Figure 2 or Figure 4 As shown, the inlet sealing protrusion 16 a and the outlet sealing protrusion 17 a form an inlet groove 16 b and an outlet groove 17 b on the front side of the single-layer bipolar plate 1 , and the groove cavity of the inlet groove 16 b and the groove cavity of the outlet groove 17 b are part of the hydrogen cavity 13 .

[0041] The inlet corrugated structure 19 surrounds the hydrogen inlet 11 and is located between the hydrogen inlet 11 and the inlet groove 16b. The corrugations of the inlet corrugated structure 19 are arranged in sequence along the circumference of the hydrogen inlet 11. The front side corrugated groove of the inlet corrugated structure 19 connects the hydrogen inlet 11 and the inlet groove 16b, so that the hydrogen can enter the hydrogen cavity 13 along the front side corrugated groove of the inlet corrugated structure 19. When the inlet corrugated structure 19 has a corner, a corner support portion 113 is provided at the corner of the inlet corrugated structure 19.

[0042] The outlet corrugated structure 110 surrounds the hydrogen outlet 12 and is located between the hydrogen outlet 12 and the outlet groove 17b. The corrugations of the outlet corrugated structure 110 are arranged in sequence along the circumference of the hydrogen outlet 12. The front side corrugated grooves of the outlet corrugated structure 110 communicate with the hydrogen outlet 12 and the outlet groove 17b, so that the hydrogen in the hydrogen cavity 13 can be discharged from the hydrogen outlet 12 along the front side corrugated grooves of the outlet corrugated structure 110. When the outlet corrugated structure 110 has a corner, a corner support portion 113 is provided at the corner of the outlet corrugated structure 110.

[0043] In the application state, the crests of the inlet corrugated structure 19 of the single-layer bipolar plate 1 and the corner support portions 113 at their corners, as well as the crests of the outlet corrugated structure 110 and the corner support portions 113 at their corners support the MEA located on the front side of the single-layer bipolar plate 1, and the troughs of the inlet corrugated structure 19 of the single-layer bipolar plate 1 and the corner support portions 113 at their corners, as well as the troughs of the outlet corrugated structure 110 and the corner support portions 113 at their corners support the MEA located on the back side of the single-layer bipolar plate 1.

[0044] The above-mentioned inlet corrugated structure 19 and outlet corrugated structure 110 can guide hydrogen into and out of the hydrogen chamber 13, achieving the technical effect of optimizing the hydrogen flow field, and can serve as a supporting structure to support MEA, achieving the technical effect of improving the overall strength of the fuel cell stack.

[0045] In one embodiment, Figure 2-Figure 6 As shown, the corrugated structure of the single-layer bipolar plate 1 includes an intermediate corrugated structure 111. The intermediate corrugated structure 111 is disposed between the inlet groove 16b and the outlet groove 17b. Each corrugation of the intermediate corrugated structure 111 is along the line connecting the center of the hydrogen inlet 11 and the center of the hydrogen outlet 12 ( Figure 2 L) are arranged in sequence.

[0046] The front side corrugated groove of the middle corrugated structure 111 ( Figure 2 The groove cavity of the middle corrugated structure 111a) forms a hydrogen channel, which is a part of the hydrogen cavity 13. Figure 3 The middle corrugated structure 111b) forms an air channel, which is a part of the air cavity 15, and the two ends of the air channel in the length direction are connected to the groove cavity of the main groove 14b. Specifically, the front side corrugated groove and the back side corrugated groove of the middle corrugated structure 111 can be straight grooves or curved grooves (straight grooves in the figure). The length direction of the front side corrugated groove and the back side corrugated groove of the middle corrugated structure 111 can be perpendicular to the center line of the hydrogen inlet 11 and the hydrogen outlet 12 (vertical in the figure) or at a certain angle.

[0047] A connecting groove 112 is provided at the crest of the middle corrugated structure 111. Specifically, a plurality of connecting grooves 112 can be arranged at equal intervals in sequence along the length direction of each crest of the middle corrugated structure 111. The inlet groove 16b and the outlet groove 17b are connected to each other through the connecting groove 112 and the front corrugated groove of the middle corrugated structure 111. The depth of the connecting groove 112 is less than the depth of the front corrugated groove of the middle corrugated structure 111. With this design, hydrogen can enter the outlet groove 17b from the inlet groove 16b along the connecting groove 112 and the front corrugated groove of the middle corrugated structure 111, thereby forming a uniform hydrogen flow field between the inlet groove 16b and the outlet groove 17b. Specifically, the connecting groove 112 can be a straight groove or a curved groove (a straight groove in the figure), and the length direction of the connecting groove 112 can be parallel to the center line connecting the hydrogen inlet 11 and the hydrogen outlet 12 (parallel in the figure) or at a certain angle.

[0048] In use, the peaks of the middle corrugated structure 111 of the single-layer bipolar plate 1 support the MEA on the front side of the single-layer bipolar plate 1 , and the troughs of the middle corrugated structure 111 of the single-layer bipolar plate 1 support the MEA on the back side of the single-layer bipolar plate 1 .

[0049] The middle corrugated structure 111 of the above structure can guide hydrogen and air to be dispersed into different hydrogen channels and air channels, achieving the technical effect of optimizing the hydrogen flow field and the air flow field, and can serve as a supporting structure to support the MEA, achieving the technical effect of improving the overall strength of the fuel cell stack.

[0050] In one embodiment, the single-layer bipolar plate 1 is a metal stamping bipolar plate, and metal stamping can easily form the above-mentioned corrugations, grooves and protrusions.

[0051] In one embodiment, Figure 7 As shown, the first bipolar plate A and the second bipolar plate B on both sides of the same MEA have the crests of the corrugated structure of one offset against the troughs of the corrugated structure of the other across the MEA, so that the support is better. Specifically, the crests and troughs of the corrugated structure 18 around the first bipolar plate A and the corrugated structure 18 around the second bipolar plate B offset against the MEA, the crests and troughs of the inlet corrugated structure 19 of the first bipolar plate A and the inlet corrugated structure 19 of the second bipolar plate B offset against the MEA, the crests and troughs of the outlet corrugated structure 110 of the first bipolar plate A and the outlet corrugated structure 110 of the second bipolar plate B offset against the MEA, and the crests and troughs of the middle corrugated structure 111 of the first bipolar plate A and the middle corrugated structure 111 of the second bipolar plate B offset against the MEA.

[0052] In one embodiment, each front side corrugated groove (i.e., hydrogen channel- Figure 7 The length of each reverse side corrugated groove (i.e., air channel - H) is separated from the MEA by the center line and the other middle corrugated structure. Figure 7 The length of the middle O) is aligned to the center line. This design provides better support.

[0053] In one embodiment, the first bipolar plate A and the second bipolar plate B on both sides of the same MEA have a peripheral corrugated structure 18 of one plate abutting against the peripheral corrugated structure 18 and the main sealing protrusion 14a of the other plate across the MEA, and the width of the peripheral corrugated structure 18 and the main sealing protrusion 14a of the other plate is equal to the sum of the widths of the peripheral corrugated structure 18 and the main sealing protrusion 14a of the other plate. For example, in the figure, the sum of the widths of the peripheral corrugated structure 18 and the main sealing protrusion 14a of the first bipolar plate A ( Figure 2 W2) is equal to the width of the corrugated structure 18 around the second bipolar plate B ( Figure 4 Middle W3). This design provides better support.

[0054] In one embodiment, the first single-layer bipolar plate 1 and the second single-layer bipolar plate 1 on both sides of the same MEA, the inlet corrugated structure 19 of one is separated from the MEA and abuts against the inlet corrugated structure 19 and the inlet sealing protrusion 16a of the other, and the width is equal to the sum of the widths of the inlet corrugated structure 19 and the inlet sealing protrusion 16a of the other, and the outlet corrugated structure 110 of one is separated from the MEA and abuts against the outlet corrugated structure 110 and the outlet sealing protrusion 17a of the other, and the width is equal to the sum of the widths of the outlet corrugated structure 110 and the outlet sealing protrusion 17a of the other. For example, in the figure, the sum of the widths of the inlet corrugated structure 19 and the inlet sealing protrusion 16a of the second bipolar plate B ( Figure 5 W4) is equal to the width of the corrugated structure 18 around the first bipolar plate A ( Figure 2 Middle W1). This design provides better support.

[0055] Specifically, the widths of the main sealing protrusions 14a of the first bipolar plate A and the second bipolar plate B on both sides of the same MEA may be the same or different. The widths of the inlet sealing protrusions 16a of the first bipolar plate A and the second bipolar plate B on both sides of the same MEA may be the same or different. The widths of the outlet sealing protrusions 17a of the first bipolar plate A and the second bipolar plate B on both sides of the same MEA may be the same or different.

[0056] The above embodiments can be freely combined without conflict.

[0057] The above specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A single-layer bipolar plate, characterized in that: The single-layer bipolar plate (1) is provided with two through holes penetrating the front and back sides thereof, wherein one through hole is a hydrogen inlet (11) and the other through hole is a hydrogen outlet (12); a hydrogen cavity (13) and a main sealing protrusion (14a) are provided on the front side of the single-layer bipolar plate (1), wherein the hydrogen cavity (13) is in communication with the hydrogen inlet (11) and the hydrogen outlet (12), and the main sealing protrusion (14a) surrounds the hydrogen cavity (13) and can be in close contact with the MEA (C) to seal the hydrogen cavity (13); An air cavity (15), an inlet sealing protrusion (16a) and an outlet sealing protrusion (17a) are provided on the reverse side of the bipolar plate (1); the inlet sealing protrusion (16a) surrounds the hydrogen inlet (11) and can be in close contact with the MEA (C) to seal and isolate the air cavity (15) and the hydrogen inlet (11); the outlet sealing protrusion (17a) surrounds the hydrogen outlet (12) and can be in close contact with the MEA (C) to seal and isolate the air cavity (15) and the hydrogen outlet (12).

2. The single-layer bipolar plate according to claim 1, characterized in that: The single-layer bipolar plate (1) is provided with a corrugated structure, wherein the corrugated structure forms peaks and corrugated grooves on the front side of the single-layer bipolar plate (1) and forms troughs and corrugated grooves on the back side, and the peaks and troughs of the corrugated structure can support the MEA (C).

3. The single-layer bipolar plate according to claim 2, characterized in that: The main sealing protrusion (14a) forms a main groove (14b) on the reverse side of the single-layer bipolar plate (1), and the groove cavity of the main groove (14b) is a part of the air cavity (15); the corrugated structure includes a surrounding corrugated structure (18), and the surrounding corrugated structure (18) surrounds the main groove (14b), and the reverse side corrugated groove of the surrounding corrugated structure (18) is connected to the main groove (14b).

4. The single-layer bipolar plate according to claim 2, characterized in that: The inlet sealing protrusion (16a) and the outlet sealing protrusion (17a) respectively form an inlet groove (16b) and an outlet groove (17b) on the front side of the single-layer bipolar plate (1), and the groove cavity of the inlet groove (16b) and the groove cavity of the outlet groove (17b) are part of the hydrogen cavity (13); the corrugated structure includes an inlet corrugated structure (19) and an outlet corrugated structure (110); the inlet corrugated structure (19) surrounds the hydrogen inlet (11) and is located Between the hydrogen inlet (11) and the inlet groove (16b), the front side corrugated groove of the inlet corrugated structure (19) is connected to the hydrogen inlet (11) and the inlet groove (16b); the outlet corrugated structure (110) surrounds the hydrogen outlet (12) and is located between the hydrogen outlet (12) and the outlet groove (17b), and the front side corrugated groove of the outlet corrugated structure (110) is connected to the hydrogen outlet (12) and the outlet groove (17b).

5. The single-layer bipolar plate according to claim 4, characterized in that: The corrugated structure comprises an intermediate corrugated structure (111), wherein the intermediate corrugated structure (111) is arranged between the inlet groove (16b) and the outlet groove (17b), wherein the corrugations of the intermediate corrugated structure (111) are arranged in sequence on a line connecting the center of the hydrogen inlet (11) and the center of the hydrogen outlet (12), wherein the groove cavity of the corrugated groove on the front side of the intermediate corrugated structure (111) becomes a hydrogen channel, and the groove cavity of the corrugated groove on the back side of the intermediate corrugated structure (111) becomes an air channel, and a connecting groove (112) is provided at the wave crest of the intermediate corrugated structure (111), wherein the inlet groove (16b) and the outlet groove (17b) are connected via the connecting groove (112) and the corrugated groove on the front side of the intermediate corrugated structure (111), and the depth of the connecting groove (112) is less than the depth of the corrugated groove on the front side of the intermediate corrugated structure (111).

6. The single-layer bipolar plate according to any one of claims 1 to 5, characterized in that: The single-layer bipolar plate (1) is a metal stamping bipolar plate.

7. A battery stack, characterized in that: The battery stack includes a first bipolar plate (A), a second bipolar plate (B) and an MEA (C), wherein the MEA (C) is closely attached between the back side of the first bipolar plate (A) and the front side of the second bipolar plate (B) or closely attached between the front side of the first bipolar plate (A) and the back side of the second bipolar plate (B), and the first bipolar plate (A) and the second bipolar plate (B) are single-layer bipolar plates (1) as described in any one of claims 1 to 6.

8. The battery stack according to claim 7, characterized in that: The first bipolar plate (A) and the second bipolar plate (B) are provided with the corrugated structure as claimed in claim 2. The first bipolar plate (A) and the second bipolar plate (B) on both sides of the same MEA (C) have the crest of the corrugated structure of one offset against the trough of the corrugated structure of the other across the MEA (C).

9. The battery stack according to claim 8, characterized in that: The corrugated structure comprises the circumferential corrugated structure (18) of claim 3, the first bipolar plate (A) and the second bipolar plate (B) on both sides of the same MEA (C), the circumferential corrugated structure (18) of one of them abuts against the circumferential corrugated structure (18) and the main sealing protrusion (14a) of the other of them across the MEA (C) and has a width equal to the sum of the widths of the circumferential corrugated structure (18) and the main sealing protrusion (14a) of the other of them; and / or, The corrugated structure comprises the inlet corrugated structure (19) of claim 4, the first bipolar plate (A) and the second bipolar plate (B) on both sides of the same MEA (C), the inlet corrugated structure (19) of one of them abuts against the inlet corrugated structure (19) and inlet sealing protrusion (16a) of the other of them across the MEA (C) and has a width equal to the sum of the widths of the inlet corrugated structure (19) and inlet sealing protrusion (16a) of the other of them; and / or, The corrugated structure includes the outlet corrugated structure (110) of claim 4, the first bipolar plate (A) and the second bipolar plate (B) on both sides of the same MEA (C), the outlet corrugated structure (110) of one of them being in contact with the outlet corrugated structure (110) and the outlet sealing protrusion (17a) of the other across the MEA (C) and having a width equal to the sum of the widths of the outlet corrugated structure (110) and the outlet sealing protrusion (17a) of the other.

10. The battery stack according to claim 9, characterized in that: The corrugated structure includes the intermediate corrugated structure (111) of claim 5, the first bipolar plate (A) and the second bipolar plate (B) on both sides of the same MEA (C), the length of the front side corrugated groove of the intermediate corrugated structure (111) of one is aligned with the length of the back side corrugated groove of the other intermediate corrugated structure (111) toward the center line across the MEA (C).

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