A mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack

Abstract

The present invention provides a mixed-channel proton-oxygen ion reversible solid oxide fuel cell stack, comprising a lower end plate and an upper end plate disposed above the lower end plate, with a single-chip battery cell disposed between the upper and lower end plates, and side cover air intake plates disposed on either side of the single-chip battery cell. The present invention utilizes the aforementioned mixed-channel proton-oxygen ion reversible solid oxide fuel cell stack, integrating proton-conducting single cells with oxygen-ion-conducting cells. This facilitates optimized stack performance over a wider temperature range and improves stack temperature distribution, making the stack more suitable for power generation systems.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and in particular to a mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack. Background Art

[0002] The supply of renewable energy sources such as wind, solar, and tidal energy is affected by weather and natural conditions, resulting in significant instability, intermittency, and randomness. This makes it difficult to maintain a stable power supply, significantly impacting the power grid. The proton-oxygen ion reversible solid oxide cell (RSOC) can achieve bidirectional energy conversion for hydrogen production and power generation in a single device. When power is in surplus, it operates in an electrolyzer (SOEC) mode to produce green fuel. When power is in demand, it operates in a fuel cell (SOFC) mode to efficiently generate electricity using the synthesized green fuel. Compared to other electrolyzers and fuel cells, the RSOC operates over a wide temperature range, boasts higher energy conversion efficiency, and a wide adjustable voltage range. It is a high-capacity, high-charge / discharge cycle energy storage device suitable for balancing supply and demand under unstable power supply conditions. Summary of the Invention

[0003] The purpose of the present invention is to provide a mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack, which integrates proton conductive single cells and oxygen ion conductive cells, which is beneficial to optimize the stack performance in a wider temperature range, and is also beneficial to the temperature distribution of the stack, making the stack more suitable for power generation systems.

[0004] To achieve the above-mentioned objectives, the present invention provides a mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack, comprising a lower end plate and an upper end plate arranged above the lower end plate, a battery cell is arranged between the upper end plate and the lower end plate, side cover air intake plates are arranged on both sides of the battery cell, and the battery cell is composed of multiple single-chip battery cells.

[0005] Preferably, a gas inlet and a gas outlet are respectively provided at both ends of the lower end plate, and a gas inlet groove and a gas outlet groove are provided on the lower end plate, the gas inlet groove is located at the gas inlet, and the gas outlet groove is located at the gas outlet;

[0006] A battery unit positioning groove is provided on the lower end plate between the gas inlet groove and the gas outlet groove;

[0007] Air inlets and air outlets are provided on both sides of the lower end plate, and an air inlet groove and an air outlet groove are provided on the lower end plate. The air inlet groove is located at the air inlet end, and the air outlet groove is located at the air outlet end.

[0008] Preferably, a first bipolar plate is provided on the monolithic battery unit, a second bipolar plate is provided above the first bipolar plate, the second bipolar plate is provided with a third slot and a fourth slot, anode foam metal is provided in each of the third slot and the fourth slot, and a proton-conducting solid oxide fuel cell and an oxygen-ion-conducting solid oxide fuel cell are provided on one side of the anode foam metal;

[0009] A first bipolar plate gas groove is provided on the first bipolar plate, and the other side of the anode foam metal is embedded in the first bipolar plate gas groove;

[0010] A cathode foam metal is provided on the other side of the first bipolar plate;

[0011] A second bipolar plate gas inlet and a second bipolar plate gas outlet are respectively provided at both ends of the second bipolar plate. The second bipolar plate gas inlet and the second bipolar plate gas outlet are respectively located on one side of the third card slot and the fourth card slot. A first sealing layer is provided at the second bipolar plate gas inlet and the second bipolar plate gas outlet. A spacing is provided between the third card slot and the fourth card slot, and a second sealing layer is provided between the third card slot and the fourth card slot.

[0012] Preferably, a first bipolar plate gas cross-complementary flow groove is provided between the first bipolar plate gas grooves on the first bipolar plate, a first bipolar plate gas inlet and a first bipolar plate gas outlet are provided at both ends of the first bipolar plate, a first bipolar plate air cross-complementary flow groove is further provided between the first bipolar plate gas inlet and the first bipolar plate gas outlet, and the first bipolar plate air cross-complementary flow groove and the first bipolar plate gas cross-complementary flow groove are located on both sides of the first bipolar plate;

[0013] A first bipolar plate air groove is formed between the first bipolar plate gas inlet, the first bipolar plate gas outlet and the first bipolar plate air cross-complementary flow groove.

[0014] Preferably, the side cover air intake plate is further provided with a first groove, and the first groove is connected to the side cover air intake hole;

[0015] The air inlet groove and the air outlet groove are in contact with the side cover air inlet hole provided at the bottom end of the side cover air inlet plate, and a side cover base sealing strip is provided between the side cover air inlet plate and the lower end plate;

[0016] A side cover sealing strip is provided between the side cover air intake plate and the single-chip battery unit.

[0017] Preferably, there is at least one air inlet, air outlet, air inlet groove, and air outlet groove.

[0018] Preferably, the upper end plate is provided with cross-complementary air flow grooves.

[0019] Preferably, connector positioning holes are provided at both ends of the second bipolar plate, and first limit blocks are provided at both ends of the lower end plate, a first card slot is provided on the first limit block, and a first circular hole is provided on one side of the first card slot; second limit blocks are provided at both ends of the upper end plate, and a second card slot is provided on the second limit block; a long assembly screw is provided in the connector positioning hole, and the two ends of the long assembly screw are also connected to the first card slot and the second card slot.

[0020] Preferably, side cover fixing holes are provided at both ends of the side cover air intake plate, and side cover fixing bolts are provided between the side cover fixing holes for connecting the side cover air intake plate.

[0021] Preferably, the gas cross-complementary flow grooves of the first bipolar plate, the air cross-complementary flow grooves of the first bipolar plate, and the air cross-complementary flow grooves are all composed of a plurality of protrusions at intervals.

[0022] Therefore, the present invention adopts the above-mentioned mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack, and the technical effects are as follows:

[0023] In the fuel cell stack of the present invention, the proton conducting single cell and the oxygen ion conducting cell are integrated, which is beneficial to optimizing the fuel cell performance in a wider temperature range and is also beneficial to the temperature distribution of the fuel cell stack, making the fuel cell stack more suitable for power generation systems.

[0024] In the fuel cell stack of the present invention, two air intake structures, an inner gas flow channel and an outer air flow channel, are combined. Compared with the outer flow channel structure, it is more conducive to the sealing of the gas flow channel, and compared with the inner flow channel, it reduces the complexity of the connector and assembly.

[0025] In the battery stack of the present invention, the connector is formed by welding two bipolar plates, which is beneficial to the sealing of the connector and simplifies the processing scheme.

[0026] In the fuel cell stack of the present invention, bolt fixing grooves and positioning holes are provided in the lower end plate to facilitate positioning and assembly of the fuel cell stack, as well as transportation of the assembled fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the split structure of the battery stack of the present invention;

[0028] Figure 2 Schematic diagram of the overall structure of the battery stack of the present invention;

[0029] Figure 3 This is a schematic diagram of the front structure of the lower end plate of the present invention;

[0030] Figure 4This is a schematic diagram of the back structure of the lower end plate of the present invention;

[0031] Figure 5 This is a schematic diagram of the disassembled structure of the battery unit of the present invention;

[0032] Figure 6 This is a schematic diagram of the front structure of the first bipolar plate of the interconnector of the present invention;

[0033] Figure 7 This is a schematic diagram of the back structure of the first bipolar plate of the interconnector of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of the second bipolar plate of the interconnector of the present invention;

[0035] Figure 9 This is a schematic diagram of the front structure of the upper end plate of the present invention;

[0036] Figure 10 This is a schematic diagram of the back structure of the upper end plate of the present invention;

[0037] Figure 11 This is a schematic structural diagram of the side cover air intake plate of the present invention;

[0038] Figure 12 This is a schematic diagram of the battery stack assembly of the present invention.

[0039] Reference numerals

[0040] 1. Lower end plate; 2. Single-cell battery unit; 3. Upper end plate; 4. Side cover air intake plate; 5. Side cover fixing bolts; 6. Bidirectional screw; 7. Side cover base sealing strip; 8. Side cover sealing strip; 9. Long assembly screw;

[0041] 101, gas inlet; 102, gas outlet; 103, first air inlet; 104, second air inlet; 105, first air outlet; 106, second air outlet; 107, first air inlet slot; 108, second air inlet slot; 109, first air outlet slot; 1010, second air outlet slot; 1011, first slot; 1012, first circular hole; 1013, gas inlet slot; 1014, gas outlet slot; 1015, battery unit positioning slot;

[0042] 201, first bipolar plate; 202, second bipolar plate; 203, first sealing layer; 204, anode metal foam; 205, proton-conducting solid oxide fuel cell; 206, oxygen-ion-conducting solid oxide fuel cell; 207, cathode metal foam; 208, second sealing layer; 209, bipolar plate welding path;

[0043] 2011, first bipolar plate gas inlet; 2012, first bipolar plate gas slot; 2013, first bipolar plate gas cross-complementary flow slot; 2014, first bipolar plate air cross-complementary flow slot; 2015, first bipolar plate air slot; 2016, first bipolar plate gas outlet;

[0044] 2021, second bipolar plate gas inlet; 2022, connector positioning hole; 2023, third slot; 2024, second bipolar plate gas outlet; 2025, fourth slot;

[0045] 301, second card slot; 302, air cross-complementary flow slot; 401, side cover fixing hole; 402, side cover air inlet hole; 403, first groove. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0047] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0048] Example 1

[0049] like Figure 1 As shown, a mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack includes a lower end plate 1, an upper end plate 3 arranged above the lower end plate 1, a battery cell is arranged between the upper end plate 3 and the lower end plate 1, and side cover air intake plates 4 are arranged on both sides of the battery cell 2. The battery cell is composed of multiple single-chip battery cells 2.

[0050] A gas inlet 101 and a gas outlet 102 are respectively provided at both ends of the lower end plate 1. A gas inlet groove 1013 and a gas outlet groove 1014 are provided on the lower end plate 1. The gas inlet groove 1013 is located at the gas inlet end, and the gas outlet groove 1014 is located at the gas outlet 102 end.

[0051] A battery unit positioning groove is provided on the lower end plate 1 between the gas inlet groove 1013 and the gas outlet groove 1014 .

[0052] Air inlets and air outlets are provided on both sides of the lower end plate 1. Air inlet grooves and air outlet grooves are provided on the lower end plate 1. The air inlet groove is located at the air inlet end, and the air outlet groove is located at the air outlet end. In this embodiment, there are two air inlets, air outlets, air inlet grooves, and air outlet grooves, including a first air inlet 103, a second air inlet 104, a first air outlet groove 109, and a second air outlet groove 1010.

[0053] The side cover air inlet plate 4 is also provided with a first groove 403, which communicates with the side cover air inlet hole 402. The air inlet groove and air outlet groove contact the side cover air inlet hole 402 located at the bottom end of the side cover air inlet plate. A side cover base sealing strip 7 is provided between the side cover air inlet plate 4 and the lower end plate 1. A side cover sealing strip 8 is provided between the side cover air inlet plate 4 and the single-cell battery unit 2. Side cover fixing holes 401 are provided at both ends of the side cover air inlet plate 4. Side cover fixing bolts 5 are provided between the side cover fixing holes 401 to connect the side cover air inlet plate 4.

[0054] Gas enters each monolithic battery cell 2 from the gas inlet 101 through the gas inlet slot 1013, and after reaction, is discharged from the gas outlet slot 1014 through the gas outlet 102. Air enters the side cover inlet plate 4 through the first air inlet 103 and the second air inlet 104, respectively, and then enters each monolithic battery cell 2. After reaction, it is discharged from the first air outlet slot 109 and the second air outlet slot 1010 through the first air outlet 105 and the second air outlet 106. The monolithic battery cells 2 are positioned in the battery cell positioning slots 1015 and then stacked. The side cover inlet plate 4 is sealed on the air side by the side cover base sealing strip 7 and the side cover sealing strip 8, and is fixed to the side cover by the side cover fixing bolts 5.

[0055] A first bipolar plate 201 is provided on the monolithic battery unit 2, and a second bipolar plate 202 is provided above the first bipolar plate 201. The second bipolar plate 202 is provided with a third slot 2025 and a fourth slot 2026. Anode foam metal 204 is provided in the third slot 2025 and the fourth slot 2026. A proton-conducting solid oxide fuel cell 205 and an oxygen-ion-conducting solid oxide fuel cell 206 are provided on one side of the anode foam metal 204; a first bipolar plate gas groove 2012 is provided on the first bipolar plate 201, and the other side of the anode foam metal 204 is embedded in the first bipolar plate gas groove 2012; a cathode foam metal 207 is provided on the other side of the first bipolar plate 201.

[0056] A second bipolar plate gas inlet 2021 and a second bipolar plate gas outlet 2024 are provided at both ends of the second bipolar plate 202. The second bipolar plate gas inlet 2021 and the second bipolar plate gas outlet 2024 are located on either side of the third slot 2025 and the fourth slot 2026, respectively. A first sealing layer 203 is provided at the second bipolar plate gas inlet 2021 and the second bipolar plate gas outlet 2024. A gap is provided between the third slot 2025 and the fourth slot 2026, and a second sealing layer 208 is provided between the third slot 2025 and the fourth slot 2026. The first sealing layer 203 and the second sealing layer 208 are located on the same horizontal plane, and the proton-conducting solid oxide fuel cell 205 and the oxygen-ion-conducting solid oxide fuel cell 206 are located on the same horizontal plane.

[0057] A first bipolar plate gas cross-complementary flow groove 2013 is provided between the first bipolar plate gas grooves 2011 on the first bipolar plate 204. A first bipolar plate gas inlet 2011 and a first bipolar plate gas outlet 2016 are provided at both ends of the first bipolar plate 201. A first bipolar plate air cross-complementary flow groove 2014 is further provided between the first bipolar plate gas inlet 2011 and the first bipolar plate gas outlet 2016. The first bipolar plate air cross-complementary flow groove 2014 and the first bipolar plate gas cross-complementary flow groove 2013 are located on both sides of the first bipolar plate 201.

[0058] A first bipolar plate air groove 2015 is formed between the first bipolar plate gas inlet 2011 , the first bipolar plate gas outlet 2016 and the first bipolar plate air cross-complementary flow groove 2014 .

[0059] A first bipolar plate air groove 2015 is formed between the first bipolar plate gas inlet 2011, the first bipolar plate gas outlet 2016, and the first bipolar plate gas cross-complementary flow groove 2014. The first bipolar plate gas cross-complementary flow groove 2013, the first bipolar plate air cross-complementary flow groove 2014, and the air cross-complementary flow groove 302 are all composed of multiple spaced protrusions to facilitate the circulation of air or gas.

[0060] The monolithic battery unit 2 consists of a first bipolar plate 201, a second bipolar plate 202, a first sealing layer 203, an anode metal foam 204, a proton-conducting solid oxide fuel cell 205, an oxygen-ion-conducting solid oxide fuel cell 206, a cathode metal foam 207, a second sealing layer 208, and a bipolar plate weld 209. A portion of the fuel gas is passed from the first bipolar plate gas port 2011 through the first bipolar plate gas groove 2012 and the anode metal foam 204 to react in the proton-conducting solid oxide fuel cell 205, and the remaining gas enters the oxygen-conducting solid oxide fuel cell 206 through the first bipolar plate gas cross-complementary flow groove 2013 to react, and is discharged from the first bipolar plate gas outlet 2016 after the reaction. The air is transferred through the first bipolar plate air groove 2015 through the anode metal foam 207 to react, and the gas can be complemented through the first bipolar plate air cross-complementary flow groove 2014. The second bipolar plate 202 is welded to the first bipolar plate 201 to form a complete connector. The bipolar plate weld path 209 extends along the periphery of the bipolar plate. Another portion of the gas is transferred to the next single-cell battery unit through the second bipolar plate's gas inlet 2021. To prevent gas leakage, a first sealing layer 203 is provided at the gas inlet and outlet. To prevent direct connection between the upper and lower connectors, a second sealing layer 208 is provided in the middle of the second bipolar plate 202. To facilitate connector assembly, connector positioning holes 2022 are provided on the second bipolar plate 202. For easier battery assembly, third and fourth slots 2023 and 2025 are also provided on the second bipolar plate 202.

[0061] Connector positioning holes 2022 are provided at both ends of the second bipolar plate 202, and first limit blocks are provided at both ends of the lower end plate 1, a first card slot 1011 is provided on the first limit block, and a first circular hole 1012 is provided on one side of the first card slot 1011; second limit blocks are provided at both ends of the upper end plate 3, and a second card slot 301 is provided on the second limit block; a long assembly screw 9 is provided in the connector positioning hole 2022, and the two ends of the long assembly screw 9 are also connected to the first card slot 1011 and the second card slot 301.

[0062] The long assembly screw 9 is threadedly connected to the lower end plate 1 to assemble and position the single-chip battery unit 2. When the battery stack is assembled, the long assembly screw 9 is removed and the bidirectional screw 6 is installed to tighten the battery stack.

[0063] The upper end plate 3 is provided with a flow groove 302 for air cross complementation, and the upper end plate 3 is provided with a second slot 301. The battery stack is fastened by a bidirectional screw 6. The flow groove 302 for air cross complementation is provided for air complementation.

[0064] The fuel cell stack is divided into two modes: SOFC and SOEC. The inlet and outlet directions of the two modes need to change during operation:

[0065] One is a power generation scheme based on the above-mentioned fuel cell stack. The gas inlet is close to the proton-conducting solid oxide fuel cell, and its reaction temperature is lower than that of the oxygen-ion-conducting solid oxide fuel cell. The heat generated by the battery after the reaction is transferred to the oxygen-ion-conducting solid oxide fuel cell through the reaction gas.

[0066] One is a power generation scheme based on the above-mentioned fuel cell stack. The gas inlet is converted to a fuel cell close to the oxygen ion conduction type solid oxide fuel cell, whose reaction temperature is higher than that of the proton conduction type solid oxide fuel cell. The heat of the reaction gas absorbed by the cell after the reaction is transferred to the proton conduction type solid oxide fuel cell to keep it at a suitable reaction temperature.

[0067] Therefore, the present invention adopts the above-mentioned mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack to integrate the proton conductive single cell and the oxygen ion conductive cell, which is beneficial to optimize the stack performance in a wider temperature range, and is also beneficial to the temperature distribution of the stack, making the stack more suitable for power generation systems.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack, characterized in that: It includes a lower end plate and an upper end plate arranged above the lower end plate, a battery unit is arranged between the upper end plate and the lower end plate, side cover air intake plates are arranged on both sides of the battery unit, and the battery unit is composed of multiple single-chip battery units; The monolithic battery unit is provided with a first bipolar plate, a second bipolar plate is provided above the first bipolar plate, the second bipolar plate is provided with a third slot and a fourth slot, anode foam metal is provided in the third slot and the fourth slot, and a proton-conducting solid oxide fuel cell and an oxygen-ion-conducting solid oxide fuel cell are provided on one side of the anode foam metal in the third slot and the fourth slot, respectively; Two first bipolar plate gas grooves are provided on the first bipolar plate, and the other sides of the anode foam metals in the third and fourth slots are respectively embedded in the two first bipolar plate gas grooves; A cathode foam metal is provided on the other side of the first bipolar plate; A second bipolar plate gas inlet and a second bipolar plate gas outlet are respectively provided at both ends of the second bipolar plate, the second bipolar plate gas inlet and the second bipolar plate gas outlet are respectively located on one side of the third card slot and the fourth card slot, a first sealing layer is provided at the second bipolar plate gas inlet and the second bipolar plate gas outlet, a gap is provided between the third card slot and the fourth card slot, and a second sealing layer is provided between the third card slot and the fourth card slot; A first bipolar plate gas cross-complementary flow groove is provided between the two first bipolar plate gas grooves on the first bipolar plate, a first bipolar plate gas inlet and a first bipolar plate gas outlet are provided at both ends of the first bipolar plate, a first bipolar plate air cross-complementary flow groove is further provided between the first bipolar plate gas inlet and the first bipolar plate gas outlet, and the first bipolar plate air cross-complementary flow groove and the first bipolar plate gas cross-complementary flow groove are respectively located on two surfaces of the first bipolar plate; A first bipolar plate air groove is formed between the first bipolar plate gas inlet and the first bipolar plate air cross-complementary flow groove, and between the first bipolar plate gas outlet and the first bipolar plate air cross-complementary flow groove respectively; A portion of the gas is passed from the first bipolar plate gas inlet through the first bipolar plate gas groove through the anode foam metal to react in the proton conduction solid oxide fuel cell, and the remaining gas enters the oxygen ion conduction solid oxide fuel cell through the first bipolar plate gas cross-complementary flow groove to react, and is discharged from the first bipolar plate gas outlet after the reaction. The air is transferred through the first bipolar plate air groove through the anode foam metal and then reacts. The air can be complemented through the first bipolar plate air cross-complementary flow groove.

2. The mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack according to claim 1, characterized in that: The two ends of the lower end plate are respectively provided with a gas inlet and a gas outlet, and the lower end plate is provided with a gas inlet groove and a gas outlet groove, the gas inlet groove is located at the gas inlet, and the gas outlet groove is located at the gas outlet; A battery unit positioning groove is provided on the lower end plate between the gas inlet groove and the gas outlet groove; Air inlets and air outlets are provided on both sides of the lower end plate, and an air inlet groove and an air outlet groove are provided on the lower end plate. The air inlet groove is located at the air inlet end, and the air outlet groove is located at the air outlet end.

3. The mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack according to claim 2, characterized in that: The side cover air intake plate is further provided with a first groove, the first groove being connected to the side cover air intake hole; The air inlet groove and the air outlet groove are in contact with the side cover air inlet hole provided at the bottom end of the side cover air inlet plate, and a side cover base sealing strip is provided between the side cover air inlet plate and the lower end plate; A side cover sealing strip is provided between the side cover air intake plate and the single-chip battery unit.

4. The mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack according to claim 2, characterized in that: There is at least one air inlet, air outlet, air inlet groove, and air outlet groove.

5. The mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack according to claim 1, characterized in that: The upper end plate is provided with air cross-complementary flow grooves.

6. The mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack according to claim 1, characterized in that: Connector positioning holes are provided at both ends of the second bipolar plate, and first limit blocks are provided at both ends of the lower end plate, a first card slot is provided on the first limit block, and a first circular hole is provided on one side of the first card slot; second limit blocks are provided at both ends of the upper end plate, and a second card slot is provided on the second limit block; a long assembly screw is provided in the connector positioning hole, and the two ends of the long assembly screw are also connected to the first card slot and the second card slot.

7. The mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack according to claim 1, characterized in that: Side cover fixing holes are provided at both ends of the side cover air intake plate, and side cover fixing bolts are provided between the side cover fixing holes on both sides of the battery unit for connecting the side cover air intake plates on both sides of the battery unit.

8. The mixed flow channel proton-oxygen ion reversible solid oxide fuel cell stack according to claim 5, characterized in that: The gas cross-complementary flow grooves of the first bipolar plate, the air cross-complementary flow grooves of the first bipolar plate, and the air cross-complementary flow grooves are all composed of a plurality of protrusions with intervals.

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