Integrated reversible fuel cell stack

Abstract

The invention provides an integrated reversible fuel cell stack which comprises a stack core unit, and the stack core unit comprises a plurality of stacked single cells; each single battery comprises a first polar plate, a membrane electrode and a second polar plate, and the membrane electrode is arranged between the first polar plate and the second polar plate; the first polar plate is a stamped titanium plate; and the second polar plate is one of a stamped titanium plate, a graphite plate or a stainless steel polar plate. According to the invention, the stacking process can be effectively reduced, and the risk of alignment errors is reduced. Meanwhile, the single battery can be replaced independently, and later maintenance is facilitated. Through the application, the material cost can be effectively saved, the forming process is more efficient and environment-friendly, integrated hydrogen production and fuel cell power generation can be realized, the system is more integrated, and the cost is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to an integrated reversible fuel cell stack. Background Art

[0002] The Unitized Regenerative Fuel Cell (URFC) is a new type of energy storage device. When used in conjunction with a hydrogen storage system, it can achieve the conversion between electricity-hydrogen-electricity, thereby achieving energy storage. Compared with separate hydrogen production systems and fuel cell power generation systems, the reversible fuel cell stack has two working modes: hydrogen production and power generation: when the collector plate is connected to electricity, a water electrolysis reaction occurs, the anode produces oxygen, and the cathode produces hydrogen and stores it; when there is no external power, hydrogen is introduced into the anode and air is introduced into the cathode to perform the fuel cell working mode to complete the generation of electricity. Therefore, the device can be used in energy storage, backup power supply and other fields. The reversible fuel cell system has a compact structure, high integration, and universal components. Compared with current secondary batteries, the energy density and power density are higher. At the same time, it can be coupled with wind power, photovoltaic power generation, etc., and is suitable for different types of energy storage application scenarios such as household, industrial and commercial.

[0003] According to the different types of electrolytes, integrated reversible fuel cells can be divided into proton exchange membrane reversible fuel cells, anion exchange membrane reversible fuel cells and solid oxide reversible fuel cells. Anion exchange membranes are prone to degradation in alkaline environments for a long time, affecting the life of the stack and system. - The conductivity in the anion exchange membrane is low, and the performance of hydrogen production and fuel cells is poor; although the solid oxide reversible fuel cell has a high efficiency of hydrogen production and fuel cells, the operating temperature usually needs to be above 500°C, and the system is relatively complex. The proton exchange membrane (PEM) technology has matured, and the electrolyzer and fuel cell stack based on the proton exchange membrane have been commercialized, with the advantages of high power density, high efficiency, high reliability, and rapid startup. The proton exchange membrane reversible fuel cell will become the most important URFC technology route.

[0004] In order to meet the high anode potential requirements of the water electrolysis hydrogen production mode, URFC needs to use titanium-based plates. Currently, acid-etched titanium plates with flow channels are used. The processing technology is complex, the plate thickness is large, and the etching process requires multiple steps such as masking, corrosion, and cleaning. In addition, the material utilization rate is low and the cost is high, which cannot meet the requirements of large-scale commercialization. In addition, the URFC stack assembly process is complex, and the thick etched titanium plates are prone to warping and require a lot of stacking force to level them. At the same time, the high-power URFC stack has a large number of sheets, which further increases the alignment risk. Summary of the invention

[0005] Based on this, an embodiment of the present invention provides an integrated reversible fuel cell stack, which aims to solve the problems of the existing URFC using acid-etched titanium plates, large plate thickness, complex processing technology, low material utilization, high cost, easy warping when assembling the URFC stack, and requiring a large stacking force for leveling, and difficulty in alignment.

[0006] To achieve the above-mentioned purpose, an embodiment of the present invention provides an integrated reversible fuel cell stack, including a core unit, wherein the core unit includes a plurality of stacked single cells; each of the single cells includes a first electrode plate, a membrane electrode and a second electrode plate, and the membrane electrode is arranged between the first electrode plate and the second electrode plate; the first electrode plate is a stamped titanium plate; the second electrode plate is one of a stamped titanium plate, a graphite plate or a stainless steel electrode plate.

[0007] As a preferred embodiment, a Pt coating (precious metal coating) is provided on the side of the first electrode plate; when the second electrode plate is a stamped titanium plate or a stainless steel electrode plate, a Pt coating (precious metal coating) or a C coating (non-precious metal coating) is provided on the side of the second electrode plate.

[0008] As a preferred embodiment, the first electrode plate is the electrode plate on the side where the OER reaction occurs; the second electrode plate is the side electrode plate where the HER reaction occurs; and the working potential of the first electrode plate is 1.7V to 2.2V.

[0009] As a preferred embodiment, the thickness of the first electrode plate is 0.1 mm to 1.0 mm; the thickness of the second electrode plate is 0.1 mm to 1.0 mm.

[0010] As a preferred embodiment, the thickness of the Pt coating is 20 nm to 500 nm; the thickness of the C coating is 0.2 μm to 5.0 μm.

[0011] As a preferred embodiment, a first active area is arranged on the side of the first electrode plate (anode plate) away from the membrane electrode; first drainage areas are arranged on both sides of the first active area; and a first gap is arranged between each first drainage area and the first active area.

[0012] As a preferred embodiment, each of the first drainage areas includes a plurality of mutually parallel first drainage channels; a first drainage ridge is arranged between two adjacent first drainage channels; and the first drainage channel is arranged at an angle to the first active area.

[0013] As a preferred embodiment, in two adjacent single cells, the first electrode plate of one of the single cells abuts against the second electrode plate of the other single cell.

[0014] As a preferred embodiment, the membrane electrode comprises a first diffusion layer, a CCM (catalyst coated membrane) and a second diffusion layer; the CCM is arranged between the first diffusion layer and the second diffusion layer; the first diffusion layer is arranged close to the first electrode plate, and the second diffusion layer is arranged close to the second electrode plate.

[0015] As a preferred embodiment, the first diffusion layer is titanium felt; the second diffusion layer is one of titanium felt, titanium mesh, stainless steel mesh or carbon substrate diffusion layer.

[0016] As a preferred embodiment, the thickness of the first diffusion layer is 150 μm to 1000 μm; the thickness of the second diffusion layer is 200 μm to 500 μm.

[0017] As a preferred embodiment, one end of the single cell is provided with an oxygen outlet, a coolant outlet and a hydrogen inlet, and the coolant outlet is provided between the oxygen outlet and the hydrogen inlet; the other end of the single cell is provided with a hydrogen outlet, a coolant inlet and an oxygen inlet, and the coolant inlet is provided between the hydrogen outlet and the oxygen inlet, and the oxygen outlet and the hydrogen outlet are arranged opposite to each other.

[0018] As a preferred embodiment, the oxygen outlet, the coolant outlet, the hydrogen inlet, the hydrogen outlet, the coolant inlet and the oxygen inlet are all arranged through the first electrode plate, the membrane electrode and the second electrode plate.

[0019] As a preferred embodiment, the integrated reversible fuel cell stack also includes a first current collecting plate, a second current collecting plate, a first tail plate, a second tail plate, a first end plate, a second end plate and a plurality of stacking screws; the first tail plate is arranged at the anode end of the core unit (i.e., the end on the hydrogen side), and the second tail plate is arranged at the cathode end of the core unit (i.e., the end on the air side); the first current collecting plate is arranged on the side of the first tail plate away from the core unit; the second current collecting plate is arranged on the side of the second tail plate away from the core unit; the first end plate is arranged on the side of the first current collecting plate away from the core unit; the second end plate is arranged on the side of the second current collecting plate away from the core unit; the stacking screws are arranged around the core unit, and one end of the stacking screw is fixedly connected to the first end plate, and the other end is fixedly connected to the second end plate.

[0020] As a preferred embodiment, the integrated reversible fuel cell stack also includes a second end plate accessory and a plurality of discs, wherein the plurality of discs are arranged between the second end plate and the second end plate accessory, and the second end plate and the second end plate accessory are fixedly connected by the stacking screw; an inlet and outlet manifold is arranged on the side of the first end plate away from the core unit.

[0021] Compared with the prior art, the structure of this application has the following technical effects: (1) This application pre-assembles the first electrode plate, membrane electrode, and second electrode plate into a standardized single cell, so that the single cell forms a modular unit, which can effectively reduce the stacking process and reduce the risk of alignment errors. At the same time, the single cell can be replaced independently, avoiding the overall scrapping of the traditional battery stack due to local damage, which is convenient for later maintenance. Through this application, integrated and integrated hydrogen production and fuel cell power generation can be achieved, the system is more integrated and the cost is lower.

[0022] (2) The first electrode plate of the present application adopts an ultra-thin stamped titanium plate (a high-precision stamping process is used to directly form flow field channels, air guide holes and sealing grooves on the titanium plate) to replace the traditional acid-etched titanium plate. The thickness of the stamped titanium plate is greatly reduced, which can effectively save material costs; at the same time, the molding process is more efficient and environmentally friendly, and the process preparation cost is low.

[0023] (3) The materials of the second electrode plate (i.e., cathode electrode plate) and the second gas diffusion layer (i.e., cathode gas diffusion layer) of the present application can be replaced according to actual needs: in the fuel cell mode, the operating voltage is between 0.6-0.9V; in the water electrolysis mode, the working potential of the second electrode plate is low, and the material of the second electrode plate in the stack can be replaced, using graphite plates or stainless steel plates, and the second gas diffusion layer can use stainless steel mesh or graphite gas diffusion layer, which can effectively reduce the cost of the electrode plate. In addition, if a metal electrode plate is used on the cathode side, its coating can be a low-cost non-precious metal C coating, which can further reduce the cost of the electrode plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the exploded structure of an integrated reversible fuel cell stack according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the overall structure of a single cell of an integrated reversible fuel cell stack; Figure 3 for Figure 2 Schematic diagram of the explosion structure of a single battery; Figure 4 for Figure 2 Schematic diagram of the partial cross-sectional structure of a single battery.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] In order to meet the high anode potential requirements of the water electrolysis hydrogen production mode, URFC needs to use titanium-based plates. At present, existing URFCs all use acid-etched titanium plates with flow channels. The plates are relatively thick, and the etching process requires multiple steps such as masking, corrosion, and cleaning. In addition, the material utilization rate is low and the cost is high, which cannot meet the requirements of large-scale commercialization.

[0033] Specifically, Figures 1 to 4 As shown, an embodiment of the present invention provides an integrated reversible fuel cell stack, including a core unit 10, wherein the core unit 10 includes a plurality of stacked single cells 11; each of the single cells 11 includes a first electrode plate 111, a membrane electrode 112 and a second electrode plate 113, wherein the membrane electrode 112 is arranged between the first electrode plate 111 and the second electrode plate 113; the first electrode plate 111 is a stamped titanium plate; the second electrode plate 113 is one of a stamped titanium plate, a graphite plate or a stainless steel electrode plate.

[0034] In the embodiment of the present application, by pre-assembling the first electrode plate 111, the membrane electrode 112 and the second electrode plate 113 into a standardized single battery unit, the stacking process can be effectively reduced and the risk of alignment error can be reduced. At the same time, the single battery can be replaced independently to avoid the overall scrapping of the traditional battery stack due to local damage, which is convenient for later maintenance. In this embodiment, the first electrode plate 111 is an anode plate and the second electrode plate 113 is a cathode plate.

[0035] The plate uses ultra-thin stamped titanium plates to replace traditional acid-etched titanium plates, and the flow field channels, air guide holes and sealing grooves are directly formed on the titanium plates through high-precision stamping technology. Compared with etched titanium plates, the thickness of stamped titanium plates is greatly reduced, saving material costs. At the same time, the molding process is more efficient and environmentally friendly, and the process preparation cost is low.

[0036] As a preferred embodiment, a Pt coating (not marked in the figure) is provided on the side of the first electrode plate 111; when the second electrode plate 113 is a stamped titanium plate or a stainless steel electrode plate, a Pt coating (not marked in the figure) or a C coating (not marked in the figure) is provided on the side of the second electrode plate 113.

[0037] In the embodiment of the present application, the material of the second electrode plate 113 can be replaced according to actual needs: in the fuel cell mode, the working voltage is between 0.6-0.9V; in the water electrolysis mode, the working potential of the second electrode plate 113 is low, and the material of the second electrode plate 113 in the stack can be a graphite plate or a stainless steel plate, further reducing the cost of the plate. At the same time, if a stamped titanium plate or a stainless steel plate is used on the second electrode plate side, the coating can be a low-cost non-precious metal C coating.

[0038] As a preferred embodiment, the first electrode plate 111 is the electrode plate on the side where the OER reaction occurs; the second electrode plate 113 is the electrode plate on the side where the HER reaction occurs; and the working potential of the first electrode plate 111 is 1.7V to 2.2V.

[0039] In the water electrolysis mode, the first electrode plate 111 undergoes an oxygen evolution reaction (Oxygen evolution reaction, OER), and the second electrode plate 113 undergoes a hydrogen evolution reaction (Hydrogen evolution reaction, HOR); in the fuel cell mode, the first electrode plate 111 undergoes a hydrogen oxidation reaction (Hydrogen oxidation reaction, HOR), and the second electrode plate 113 undergoes an oxygen reduction reaction (Oxygen reduction reaction, ORR).

[0040] As a preferred embodiment, the thickness of the first electrode plate 111 is 0.1 mm to 1.0 mm; the thickness of the second electrode plate 113 is 0.1 mm to 1.0 mm.

[0041] As a preferred embodiment, the thickness of the Pt coating is 20 nm to 500 nm; the thickness of the C coating is 0.2 μm to 5.0 μm.

[0042] As a preferred embodiment, a first active area A is provided on the side of the first electrode plate 111 away from the membrane electrode 112; first drainage areas B are provided on both sides of the first active area A; and a first gap C is provided between each first drainage area B and the first active area A. By providing the first gap, sufficient buffer space can be provided, so that the distribution of the reactants is more uniform.

[0043] As a preferred embodiment, each of the first drainage areas B includes a plurality of mutually parallel first drainage channels B1; a first drainage ridge B2 is provided between two adjacent first drainage channels B1; and the first drainage channels B1 are provided at an angle to the first active area A. This arrangement can effectively increase the concentration of reactants in the active area, thereby improving the reaction efficiency.

[0044] In this embodiment, the first active area includes a first active center area, a first active distribution area, and a second active distribution area; the first active center area is arranged between the first active distribution area and the second active distribution area, and a second gap is arranged between the first active center area and the first active distribution area, and between the first active center area and the second active distribution area; the second gap is arranged in communication with the first gap. This arrangement can further improve the reaction efficiency of the active area.

[0045] The side of the second electrode plate away from the membrane electrode 112 has the same configuration as the first electrode plate, for example, a second active area (not marked in the figure) is provided; second drainage areas (not marked in the figure) are provided on both sides of the second active area; a third gap is provided between each of the second drainage areas and the second active area. The second active area includes a second active center area, a third active distribution area and a fourth active distribution area; the second active center area is provided between the third active distribution area and the fourth active distribution area, and a fourth gap is provided between the second active center area and the third active distribution area, and between the second active center area and the fourth active distribution area; the fourth gap is connected to the third gap.

[0046] As a preferred embodiment, in two adjacent single cells 11, the first electrode plate 111 of one single cell 11 abuts against the second electrode plate 113 of the other single cell 11. In this way, the core units are closely connected, effectively saving stacking space.

[0047] As a preferred embodiment, the membrane electrode 112 includes a first diffusion layer 1121, a CCM 1122 and a second diffusion layer 1123; the CCM 1122 is arranged between the first diffusion layer 1121 and the second diffusion layer 1123; the first diffusion layer 1121 is arranged close to the first electrode plate 111, and the second diffusion layer 1123 is arranged close to the second electrode plate 113.

[0048] As a preferred embodiment, the first diffusion layer 1121 is titanium felt; the second diffusion layer 1123 is one of titanium felt, titanium mesh, stainless steel mesh or carbon-based diffusion layer.

[0049] In the embodiment of the present application, the material of the second diffusion layer 1123 can be set according to actual needs: in the fuel cell mode, the operating voltage is between 0.6-0.9V; in the water electrolysis mode, the working potential of the second electrode 113 is low, and the second diffusion layer 1123 in the fuel cell stack can adopt a diffusion layer made of stainless steel mesh or graphite material to further reduce the cost of the electrode.

[0050] As a preferred embodiment, the thickness of the first diffusion layer 1121 is 150 μm to 1000 μm; the thickness of the second diffusion layer 1123 is 200 μm to 500 μm.

[0051] As a preferred embodiment, one end of the single cell 11 is provided with an oxygen outlet 114, a coolant outlet 115 and a hydrogen inlet 116, and the coolant outlet 115 is provided between the oxygen outlet 114 and the hydrogen inlet 116; the other end of the single cell 11 is provided with a hydrogen outlet 117, a coolant inlet 118 and an oxygen inlet 119, and the coolant inlet 118 is provided between the hydrogen outlet 117 and the oxygen inlet 119, and the oxygen outlet 114 and the hydrogen outlet 117 are arranged opposite to each other.

[0052] As a preferred embodiment, the oxygen outlet 114, the coolant outlet 115, the hydrogen inlet 116, the hydrogen outlet 117, the coolant inlet 118 and the oxygen inlet 119 are all arranged through the first electrode plate 111, the membrane electrode 112 and the second electrode plate 113. When switched to the water electrolysis mode, water is introduced into the first electrode plate 111 side to generate OER reaction, HER occurs on the second electrode plate 113 side to generate hydrogen, and no medium enters the cooling path. The middle area of ​​the electrode plate includes a distribution area and an active area to ensure uniform distribution of reactants in the active area.

[0053] As a preferred embodiment, the integrated reversible fuel cell stack also includes a first current collecting plate 20, a second current collecting plate 30, a first tail plate 40, a second tail plate 50, a first end plate 60, a second end plate 70 and a plurality of stacking screws 80; the first tail plate 40 is arranged at the anode end (i.e., the end on the hydrogen side) of the core unit 10, and the second tail plate 50 is arranged at the cathode end (i.e., the end on the air side) of the core unit 10; the first current collecting plate 20 is arranged at the first tail plate 40 away from the core unit 10 side; the second current collecting plate 30 is arranged on the side of the second tail plate 50 away from the core unit 10; the first end plate 60 is arranged on the side of the first current collecting plate 20 away from the core unit 10; the second end plate 70 is arranged on the side of the second current collecting plate 30 away from the core unit 10; the stacking screw 80 is arranged around the core unit 10, and one end of the stacking screw 80 is fixedly connected to the first end plate 60, and the other end is fixedly connected to the second end plate 70.

[0054] As a preferred embodiment, the integrated reversible fuel cell stack also includes a second end plate accessory 90 and a plurality of discs 100, wherein the plurality of discs 100 are arranged between the second end plate 70 and the second end plate accessory 90, and the second end plate 70 and the second end plate accessory 90 are fixedly connected by the stacking screw 80; an inlet and outlet manifold 110 is arranged on the side of the first end plate 60 away from the core unit 10.

[0055] In one of the embodiments, the first plate (anode plate) uses an ultra-thin stamped titanium plate with a thickness of 0.1 mm. After high-precision stamping, the ultra-thin titanium plate forms a flow field on both sides. The corrosion-resistant coating of the anode plate is a Pt coating with a coating thickness of 100 nm. In this embodiment, the second plate (cathode plate) uses an ultra-thin stamped titanium plate with a thickness of 0.1 mm. The material and stamping process are the same as those of the anode plate. The corrosion-resistant coating uses a precious metal Pt coating with a coating thickness of 100 nm. The frame of the membrane electrode adopts a double-layer structure to complete the fixation and packaging of the CCM. The first diffusion layer (anode diffusion layer) uses titanium felt with a thickness of 250 μm; the second diffusion layer (cathode diffusion layer) uses a graphite-based Freudenberg gas diffusion layer with a thickness of 320 μm.

[0056] In this embodiment, after the URFC stack containing 10 single cells is assembled, the performance test results are shown in Table 1 and Table 2: Table 1: Power generation performance test results

[0057] Table 2: Hydrogen production performance test results

[0058] In another embodiment, this embodiment differs from the above embodiment in that: in this embodiment, the anode plate adopts an ultra-thin stamped titanium plate with a thickness of 0.1 mm, and the corrosion-resistant coating of the anode plate is a Pt coating with a coating thickness of 100 nm; the cathode plate adopts an ultra-thin stamped stainless plate with a thickness of 0.1 mm, which is the same as the stamping process of the anode plate, but the corrosion-resistant coating adopts a non-precious metal C coating with a coating thickness of 300 nm.

[0059] In this embodiment, after the URFC stack containing 10 single cells is assembled, the performance test results are shown in Table 3 and Table 4: Table 3: Power generation performance test results

[0060] Table 4: Hydrogen production performance test results

[0061] By comparison, the performance of the water electrolysis hydrogen production and fuel cell of the above two embodiments is comparable, but the cost of the embodiment using the cathode stainless steel plate and C coating is greatly reduced.

[0062] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An integrated reversible fuel cell stack, characterized in that: It includes a core unit, which includes a plurality of stacked single cells; each of the single cells includes a first electrode plate, a membrane electrode and a second electrode plate, and the membrane electrode is arranged between the first electrode plate and the second electrode plate; the first electrode plate is a stamped titanium plate; the second electrode plate is one of a stamped titanium plate, a graphite plate or a stainless steel electrode plate.

2. The integrated reversible fuel cell stack according to claim 1, characterized in that: The side of the first electrode plate is provided with a Pt coating; when the second electrode plate is a stamped titanium plate or a stainless steel electrode plate, the side of the second electrode plate is provided with a Pt coating or a C coating.

3. The integrated reversible fuel cell stack according to claim 1, characterized in that: The first electrode plate is the electrode plate on the side where the OER reaction occurs; the second electrode plate is the side electrode plate where the HER reaction occurs; the working potential of the first electrode plate is 1.7V to 2.2V.

4. The integrated reversible fuel cell stack according to claim 2, characterized in that: The thickness of the first electrode plate is 0.1 mm to 1.0 mm; the thickness of the second electrode plate is 0.1 mm to 1.0 mm; The thickness of the Pt coating is 20nm-500nm; the thickness of the C coating is 0.2μm-5.0μm.

5. The integrated reversible fuel cell stack according to claim 1, characterized in that: A first active area is arranged on the side of the first electrode plate away from the membrane electrode; first drainage areas are arranged on both sides of the first active area; and a first gap is arranged between each of the first drainage areas and the first active area.

6. The integrated reversible fuel cell stack according to claim 5, characterized in that: Each of the first drainage areas includes a plurality of mutually parallel first drainage channels; a first drainage ridge is arranged between two adjacent first drainage channels; and the first drainage channel is arranged at an angle to the first active area.

7. The integrated reversible fuel cell stack according to claim 1, characterized in that: The membrane electrode comprises a first diffusion layer, a CCM and a second diffusion layer; the CCM is arranged between the first diffusion layer and the second diffusion layer; the first diffusion layer is arranged close to the first electrode plate, and the second diffusion layer is arranged close to the second electrode plate; The first diffusion layer is titanium felt; the second diffusion layer is one of titanium felt, titanium mesh, stainless steel mesh or carbon substrate diffusion layer.

8. The integrated reversible fuel cell stack according to claim 7, characterized in that: The thickness of the first diffusion layer is 150 μm to 1000 μm; the thickness of the second diffusion layer is 200 μm to 500 μm.

9. The integrated reversible fuel cell stack according to claim 1, characterized in that: An oxygen outlet, a coolant outlet and a hydrogen inlet are provided at one end of the single cell, and the coolant outlet is provided between the oxygen outlet and the hydrogen inlet; a hydrogen outlet, a coolant inlet and an oxygen inlet are provided at the other end of the single cell, and the coolant inlet is provided between the hydrogen outlet and the oxygen inlet, and the oxygen outlet and the hydrogen outlet are provided oppositely; The oxygen outlet, the coolant outlet, the hydrogen inlet, the hydrogen outlet, the coolant inlet and the oxygen inlet are all arranged through the first electrode plate, the membrane electrode and the second electrode plate.

10. The integrated reversible fuel cell stack according to claim 1, characterized in that: The integrated reversible fuel cell stack also includes a first current collecting plate, a second current collecting plate, a first tail plate, a second tail plate, a first end plate, a second end plate and a plurality of stacking screws; the first tail plate is arranged at the anode end of the core unit, and the second tail plate is arranged at the cathode end of the core unit; the first current collecting plate is arranged on the side of the first tail plate away from the core unit; the second current collecting plate is arranged on the side of the second tail plate away from the core unit; the first end plate is arranged on the side of the first current collecting plate away from the core unit; the second end plate is arranged on the side of the second current collecting plate away from the core unit; the stacking screws are arranged around the core unit, and one end of the stacking screw is fixedly connected to the first end plate, and the other end is fixedly connected to the second end plate.

Images