Hydrogen system integrated structure of double-stack hydrogen fuel cell

Abstract

The invention discloses a hydrogen system integrated structure of a double-stack hydrogen fuel cell. The hydrogen system integrated structure comprises an ejector assembly (6) provided with double ejectors, an anode gas-liquid separator assembly (7) is arranged on the ejector assembly (6), a water path outlet valve block assembly (8) for preheating gas is arranged on the ejector assembly (6), and a stack internal cooling liquid outflow runner is arranged in the water path outlet valve block assembly (8); a double-ejector structure is used for replacing a hydrogen circulating pump and ejector structure, so that the cost of a single fuel cell is reduced, supplied hydrogen and stack-out high-temperature cooling liquid of an electric stack are used for heat exchange, the temperature of the cooling liquid is reduced, the circulation and heat dissipation requirements of the fuel cell on a heat management system are reduced, and the energy consumption of the fuel cell is reduced. And meanwhile, the gas-liquid separator is used for carrying out gas-liquid separation on excessive supply part of hydrogen, the water content in the hydrogen is reduced, the integration degree of a hydrogen system is improved through highly-integrated parts such as the ejector valve seat (2), the double ejectors and the gas-liquid separator, and the compactness and the volume power of the fuel cell are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular, relates to an integrated structure of a hydrogen system of a dual-stack hydrogen fuel cell. Background Art

[0002] With global warming, the demand for carbon neutrality is particularly urgent. Traditional fuel power has begun to gradually transition to pure electric and hybrid power to reduce emission pollution. However, since the main source of electricity for pure electric and hybrid power is still thermal power generation, carbon dioxide is still generated. Hydrogen fuel cells use hydrogen and oxygen to produce electricity and water through an electrochemical reaction, which can achieve zero carbon emissions. The reactants of hydrogen fuel cells are pure hydrogen and oxygen in the air. The reactants react through a proton exchange membrane to generate electricity and water. The hydrogen system is the supply and circulation system of hydrogen in the fuel cell. Its design must meet the supply demand of hydrogen and the recycling and reuse of circulating hydrogen. At the same time, the supplied hydrogen needs to be separated and heated to ensure the performance of the stack. In order to meet the existing market demand and meet the power requirements of heavy-duty commercial vehicles, ships and other equipment and the indicators of long-endurance and low hydrogen consumption, hydrogen fuel cells are gradually developing towards high-power systems of more than 180KW. Dual-stack hydrogen fuel cells can effectively increase the power of a single fuel cell system and meet the above-mentioned needs. It is one of the current mainstream technical solutions.

[0003] The patent number is 202210018715.4, and the publication date is November 22, 2022. In a public specification, a dual ejector system, a hydrogen fuel cell dual ejector module system, a design method, and a new energy vehicle are disclosed. The key points of its design are: including: a new hydrogen nozzle module, 2 solenoid valves, and a dual ejector cavity unit; wherein the dual ejector cavity unit includes: a first ejector cavity unit, a second ejector cavity unit, and an ejector diffusion cavity; the first ejector cavity unit and the second ejector cavity unit are arranged in parallel up and down and are both arranged horizontally; the first ejector cavity unit includes: a first inlet flow cavity and a first mixing cavity in sequence along its length direction; the second ejector cavity unit includes: a second inlet flow cavity and a second mixing cavity in sequence along its length direction; the ends of the first mixing cavity and the second mixing cavity are connected to the ejector diffusion cavity. The dual ejector system, the hydrogen fuel cell dual ejector module system, the design method, and the new energy vehicle of this application can meet the use of hydrogen fuel cells under all working conditions.

[0004] In the existing technology of dual-stack hydrogen fuel cells, the hydrogen system mostly adopts a hydrogen circulation pump plus an ejector structure, and the supplied hydrogen is only heated once. It has low integration, complex structure, and high cost. The water carried in the hydrogen condenses when it gets cold, which can easily cause flooding of the front of the stack, performance degradation, and shortened stack life. Summary of the invention

[0005] The present invention aims to provide a dual-stack hydrogen fuel cell hydrogen system integrated structure which can prolong the equipment life and reduce the equipment cost.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a dual-stack hydrogen fuel cell hydrogen system integrated structure, including an ejector assembly with dual ejectors, an anode gas-liquid separator assembly is provided on the ejector assembly, a water outlet valve block assembly for preheating gas is provided on the ejector assembly, and a flow channel for outflow of internal coolant of the fuel cell stack is provided in the water outlet valve block assembly.

[0007] The water outlet valve block assembly includes a water outlet valve block body connected to the ejector assembly, a hydrogen flow channel is provided in the water outlet valve block body, the stack internal coolant outflow channel is provided in the water outlet valve block body, a heat exchange plate is provided between the hydrogen flow channel and the stack internal coolant outflow channel, and the stack internal coolant outflow channel is connected to the stack.

[0008] The hydrogen flow channel is cap-shaped, the stack internal coolant outflow channel is U-shaped, the hydrogen flow channel and the stack internal coolant outflow channel partially overlap on a vertical plane, and the stack internal coolant outflow channel is connected to a coolant outlet.

[0009] The ejector assembly includes an ejector body, on which a double ejector flow channel is provided. The double ejector flow channel is divided into a large flow flow channel and a small flow flow channel. Both the large flow flow channel and the small flow flow channel are connected to the anode gas-liquid separator assembly.

[0010] The anode gas-liquid separator assembly includes an anode gas-liquid separator body, which is connected to a circulating hydrogen inlet and an ejector assembly. A gas-liquid separation flow channel containing circulating hydrogen is provided in the anode gas-liquid separator body, and the gas-liquid separation flow channel is arranged between the circulating hydrogen inlet and the ejector assembly.

[0011] The gas-liquid separation flow channel is divided into a gas mixing section, a gas-liquid separation section and a discharge section, the circulating hydrogen inlet is divided into an upper pile circulating hydrogen inlet and a lower pile circulating hydrogen inlet, the upper pile circulating hydrogen inlet and the lower pile circulating hydrogen inlet are respectively connected to the two ends of the gas mixing section, and the gas-liquid separation section is connected to the middle of the gas mixing section.

[0012] The gas mixing section is folded, the gas-liquid separation section is U-shaped, the discharge section is S-shaped, a partition plate is provided in the anode gas-liquid separator body, an opening is provided on the partition plate at the bottom, and a drain valve is provided at the bottom end of the anode gas-liquid separator body.

[0013] The partition plate is divided into an upper partition and a lower partition, the lower partition is U-shaped, the upper partition is folded, the end of the upper partition is located in the U-shaped opening of the lower partition, an extension plate is provided at the corner end of the upper partition, a baffle is provided between the lower partition and the anode gas-liquid separator body, and there is a gap between the baffle and the lower partition.

[0014] The anode gas-liquid separator body is provided with an anode gas-liquid separator cover plate, the anode gas-liquid separator cover plate is provided with an anode gas-liquid separator outlet, the anode gas-liquid separator outlet is provided with a secondary flow joint and a secondary flow joint sealing ring, and the anode gas-liquid separator outlet is connected to the ejector assembly.

[0015] The end of the ejector body is provided with a closing plate covering the water outlet valve block assembly, the large flow channel and the small flow channel are both connected to the water outlet valve block assembly, the other end of the ejector body is provided with an ejector valve seat, the ejector valve seat is provided with a large flow nozzle and a small flow nozzle, and the large flow nozzle and the small flow nozzle are provided with nozzle sealing rings.

[0016] The technical effect of the present invention is as follows: a double ejector structure is used to replace a hydrogen circulation pump plus an ejector structure, thereby reducing the cost of a single fuel cell; the hydrogen supplied by the hydrogen system is heated once by a plate heat exchanger, and then flows into the double ejector flow channel according to supply demand through a proportional valve integrated in an ejector valve seat to control the required flow rate, and the double ejector ejects the circulating hydrogen in the system supply again, and after mixing, flows into the fuel cell stack through a hydrogen flow channel composed of an ejector assembly and a water outlet valve block assembly, and the hydrogen flow channel composed of an ejector assembly and a water outlet valve block assembly is arranged at the fuel cell stack coolant outlet On the flow channel, the high-temperature coolant discharged from the stack is used to reheat the supplied hydrogen to prevent condensation of water in the hydrogen when it cools down; the supplied hydrogen is used to exchange heat with the high-temperature coolant discharged from the stack to reduce the coolant temperature, thereby reducing the circulation and heat dissipation requirements of the fuel cell for the thermal management system; the gas-liquid separator is used to separate the excess hydrogen supply into gas and liquid to reduce the water content in the hydrogen; and highly integrated ejector valve seats, double ejectors, gas-liquid separators and other components are used to improve the integration of the hydrogen system, thereby improving the compactness of the fuel cell and the volume power and mass power indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] This specification includes the following drawings, which show the following contents:

[0018] Figure 1 This is an axonometric diagram of a hydrogen system and a water outlet valve block assembly of an integrated structure of a dual-stack hydrogen fuel cell hydrogen system of the present invention;

[0019] Figure 2 for Figure 1 Axonometric diagram of a hydrogen system pre-processing module in a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0020] Figure 3 for Figure 1 An exploded diagram of an ejector valve seat assembly-plate heat exchanger of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0021] Figure 4 for Figure 1 An exploded diagram of an ejector valve seat assembly-ejector assembly of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0022] Figure 5 for Figure 1 An exploded diagram of an ejector assembly of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0023] Figure 6 for Figure 1 Axonometric diagram of a hydrogen system post-processing module in a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0024] Figure 7 for Figure 1 An exploded diagram of a hydrogen system post-processing module of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0025] Figure 8 for Figure 1 An exploded diagram of an anode gas-liquid separator assembly of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0026] Fig. 9 for Figure 1 A schematic diagram of a circulating hydrogen flow passage of an anode gas-liquid separator in a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0027] Fig.10 for Figure 1 An exploded diagram of a hydrogen system post-processing module-ejector assembly in a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0028] Fig.11 for Figure 1 An axonometric view of an ejector assembly-water outlet valve block assembly of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0029] Fig.12 for Figure 1 An exploded diagram of an ejector assembly-water outlet valve block assembly of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0030] Fig.13 for Figure 1 A schematic diagram of a hydrogen flow passage of a dual-stack hydrogen fuel cell hydrogen system integrated structure;

[0031] Fig.14 for Figure 1 Schematic diagram of the hydrogen supply secondary heating flow channel of the water outlet valve block assembly in a dual-stack hydrogen fuel cell hydrogen system integrated structure.

[0032] The following are marked in the figure: 1. Plate heat exchanger; 2. Ejector valve seat; 3. Shut-off valve; 4. Hydrogen medium pressure sensor; 5. Proportional valve; 6. Ejector assembly; 61. Ejector body; 62. Small flow nozzle; 63. Large flow nozzle; 64. Nozzle sealing ring; 7. Anode gas-liquid separator assembly; 71. Anode gas-liquid separator body; 72. Gas-liquid separation flow channel; 73. Separator plate; 74. Drain valve; 75. Anode gas-liquid separator cover plate; 8. Water outlet valve block assembly; 81. Water outlet valve block body; 82. Hydrogen flow channel; 83. Upper stack hydrogen outlet; 84. Lower stack hydrogen outlet Gas outlet; 85, coolant outlet; 86, coolant outflow channel inside the fuel cell stack; 87, heat exchange plate; 9, anode gas-liquid separator large flow outlet; 10, anode gas-liquid separator small flow outlet; 11, upper stack circulating hydrogen inlet; 12, lower stack circulating hydrogen inlet; 13, large flow secondary flow joint; 14, small flow secondary flow joint; 15, secondary flow joint sealing ring; 16, nitrogen exhaust valve; 17, separator hydrogen pressure sensor; 18, separator hydrogen temperature sensor; 19, closing plate; 20, ejector hydrogen pressure sensor; 21, ejector hydrogen temperature sensor. DETAILED DESCRIPTION

[0033] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0034] See also Figure 1-14 A hydrogen system integrated structure of a dual-stack hydrogen fuel cell comprises an ejector assembly 6 with dual ejectors, an anode gas-liquid separator assembly 7 is arranged on the ejector assembly 6, a water outlet valve block assembly 8 for preheating gas is arranged on the ejector assembly 6, and a stack internal coolant outflow channel 86 is arranged in the water outlet valve block assembly 8; a dual ejector structure is used to replace a hydrogen circulation pump plus an ejector structure, thereby reducing the cost of a single fuel cell, and heat exchange is performed between the supplied hydrogen and the high-temperature coolant discharged from the stack to reduce the coolant temperature, thereby reducing the circulation and heat dissipation requirements of the fuel cell for the thermal management system; a gas-liquid separator is used to separate the excess hydrogen supply into gas and liquid to reduce the water content in the hydrogen.

[0035] The water outlet valve block assembly 8 includes a water outlet valve block main body 81 connected to the ejector assembly 6, a hydrogen flow channel 82 is provided in the water outlet valve block main body 81, a fuel cell internal coolant outflow channel 86 is provided in the water outlet valve block main body 81, a heat exchange plate 87 is provided between the hydrogen flow channel 82 and the fuel cell internal coolant outflow channel 86, the fuel cell internal coolant outflow channel 86 is connected to the fuel cell, and a plate heat exchanger 1 is provided on the ejector assembly 6.

[0036] After the hydrogen supplied by the hydrogen system is heated once by the plate heat exchanger 1, it is controlled to flow into the double ejector assembly 6 at the required flow rate according to the demand. The ejector assembly 6 again introduces the circulating hydrogen supplied by the system, and after mixing, it flows into the fuel cell stack through the hydrogen flow channel 82 composed of the ejector assembly 6 and the water outlet valve block. When the circulating hydrogen passes through the hydrogen flow channel 82, since the hydrogen flow channel 82 is adjacent to the internal coolant outflow channel 86 of the fuel cell stack, the high-temperature coolant out of the stack flows into the internal coolant outflow channel 86 of the fuel cell stack, exchanges heat with the circulating hydrogen through the heat exchange plate 87, and uses the high-temperature coolant to perform secondary heating on the circulating hydrogen to prevent the water in the hydrogen from condensing when it is cold. At the same time, the high-temperature coolant flowing out of the fuel cell stack enters the internal coolant outflow channel 86 of the fuel cell stack. The internal coolant outflow channel 86 of the fuel cell stack is adjacent to the hydrogen flow channel 82. The circulating hydrogen in the hydrogen flow channel 82 is exchanged with heat through the heat exchange plate 87, thereby reducing the temperature of the coolant, thereby reducing the circulation and heat dissipation requirements of the fuel cell for the thermal management system.

[0037] The hydrogen flow channel 82 is in a cap shape, and the coolant outflow channel 86 inside the stack is in a U shape. The hydrogen flow channel 82 and the coolant outflow channel 86 inside the stack partially overlap on the vertical plane. The cap-shaped hydrogen flow channel 82 and the U-shaped coolant outflow channel 86 inside the stack can overlap as much as possible, thereby increasing the heat exchange output, enabling the circulating hydrogen to increase the temperature in the hydrogen flow channel 82 as much as possible, and reducing condensation. The coolant outflow channel 86 inside the stack is connected to the coolant outlet 85, and the two ends of the hydrogen flow channel 82 are respectively The upper stack hydrogen outlet 83 and the lower stack hydrogen outlet 84, the circulating hydrogen enters the hydrogen flow channel 82 through the ejector assembly 6, and flows back into the fuel cell stack through the upper stack hydrogen outlet 83 and the lower stack hydrogen outlet 84, while the high-temperature coolant flowing out of the fuel cell stack flows into the coolant outflow channel 86 inside the fuel cell stack through the coolant outlet 85, so as to perform secondary heating on the circulating hydrogen and reduce the occurrence of condensation. At the same time, the high-temperature coolant can also be cooled by the circulating hydrogen, thereby reducing the circulation and heat dissipation requirements of the fuel cell on the thermal management system.

[0038] The ejector assembly 6 comprises an ejector body 61, on which a double ejector flow channel is provided, wherein the double ejector flow channel is divided into a large flow flow channel and a small flow flow channel, both of which are connected to the anode gas-liquid separator assembly 7, and a double ejector structure is utilized to replace a hydrogen circulation pump plus an ejector structure, thereby reducing the unit cost of a fuel cell, and a double ejector structure is utilized in a hydrogen system to realize hydrogen supply for fuel cells under all operating conditions, wherein a small flow condition requiring hydrogen is solely ejected and supplied by the ejector small flow flow channel, a medium flow condition requiring hydrogen is solely ejected and supplied by the ejector large flow flow channel, and a large flow condition requiring hydrogen is jointly ejected and supplied by the ejector large and small flow flow channels, thereby realizing different hydrogen replenishment requirements under different conditions.

[0039] The anode gas-liquid separator assembly 7 includes an anode gas-liquid separator body 71, which is connected to the circulating hydrogen inlet and the ejector assembly 6. A gas-liquid separation flow channel 72 containing circulating hydrogen is provided in the anode gas-liquid separator body 71. The gas-liquid separation flow channel 72 is arranged between the circulating hydrogen inlet and the ejector assembly 6. When the circulating hydrogen enters the gas-liquid separation flow channel 72, the moisture in the circulating hydrogen is separated, the water content in the hydrogen is reduced, and the situation in which the water carried in the hydrogen condenses when it is cold and easily causes flooding of the front of the fuel cell stack is reduced, thereby delaying performance degradation and increasing the life of the fuel cell stack.

[0040] The gas-liquid separation flow channel 72 is divided into a gas mixing section, a gas-liquid separation section and a discharge section. The circulating hydrogen inlet is divided into an upper stack circulating hydrogen inlet 11 and a lower stack circulating hydrogen inlet 12. The upper stack circulating hydrogen inlet 11 and the lower stack circulating hydrogen inlet 12 are respectively connected to the two ends of the gas mixing section, and the gas-liquid separation section is connected to the middle of the gas mixing section.

[0041] The circulating hydrogen sent out from the ejector assembly 6 enters into the anode gas-liquid separator body 71 through the upper stack circulating hydrogen inlet 11 and the lower stack circulating hydrogen inlet 12 respectively, and the circulating hydrogen flows into the gas mixing section. The two streams of circulating hydrogen mix, and the circulating hydrogen continues to move along the gas-liquid separation channel 72. When the circulating hydrogen moves to the gas-liquid separation section, the gas-liquid separation is completed under the action of gravity. After passing through the gas-liquid separation section, the circulating hydrogen enters the discharge section, re-enters the ejector assembly 6, and flows into the fuel cell stack through the water outlet valve block.

[0042] The gas mixing section is in a folded shape, and the gas-liquid separation section is in a U-shape. After the circulating hydrogen enters the U-shaped gas-liquid separation section, as the circulating hydrogen flows at a high speed, the moisture in the circulating hydrogen is thrown out under the action of gravity and inertia, and the discharge section is in an S-shape. Similarly, when the circulating hydrogen enters the discharge section, the S-shaped flow channel can be further utilized to separate the moisture in the circulating hydrogen. A partition plate 73 is provided in the anode gas-liquid separator body 71. The partition plate 73 can guide the flow direction of the circulating hydrogen and improve the efficiency of gas-liquid separation. An opening is provided on the partition plate 73 at the bottom. A drain valve 74 is provided at the bottom end of the anode gas-liquid separator body 71. The separated moisture is discharged through the opening and discharged from the anode gas-liquid separator body 71 through the drain valve 74.

[0043] The partition plate 73 is divided into an upper partition and a lower partition. The lower partition is U-shaped and the upper partition is folded. The end of the upper partition is located in the U-shaped opening of the lower partition. An extension plate is provided at the corner end of the upper partition. A baffle is provided between the lower partition and the anode gas-liquid separator body 71, and there is a gap between the baffle and the lower partition.

[0044] The U-shaped lower partition cooperates with the upper partition extending into the lower partition to form a U-shaped gas-liquid separation channel, and the extension plate at the corner end of the upper partition cooperates with the upper partition to form an S-shaped discharge section, which can better separate the gas and liquid, and the separated water flows out through the opening on the lower partition and the gap between the baffle and the lower partition, and is discharged from the anode gas-liquid separator body 71.

[0045] The anode gas-liquid separator body 71 is provided with an anode gas-liquid separator cover plate 75, and the anode gas-liquid separator cover plate 75 is provided with an anode gas-liquid separator outlet, and the anode gas-liquid separator outlet is provided with a secondary flow joint and a secondary flow joint sealing ring 15, and the anode gas-liquid separator outlet is connected to the ejector assembly 6, and the circulating hydrogen after gas-liquid separation enters the ejector body 61 through the anode gas-liquid separator outlet, and is ejected and mixed with fresh hydrogen, and the hydrogen flow channel composed of the ejector assembly 6 and the waterway outlet valve block assembly 8 is formed. 82 is sent into the interior of the fuel cell stack, the outlet of the anode gas-liquid separator is divided into an anode gas-liquid separator large flow outlet 9 and an anode gas-liquid separator small flow outlet 10, the anode gas-liquid separator large flow outlet 9 and the anode gas-liquid separator small flow outlet 10 are respectively provided with a large flow secondary flow connector 13 and a small flow secondary flow connector 14, the anode gas-liquid separator cover plate 75 is provided with a nitrogen exhaust valve 16, a separator hydrogen pressure sensor 17 and a separator hydrogen temperature sensor 18 to monitor the internal circulating hydrogen in real time.

[0046] The end of the ejector body 61 is provided with a closing plate 19 covering the water outlet valve block assembly 8, and the large flow channel and the small flow channel are both connected to the water outlet valve block assembly 8. The other end of the ejector body 61 is provided with an ejector valve seat 2, and the ejector valve seat 2 is provided with a shut-off valve 3, a hydrogen medium pressure sensor 4 and a proportional valve 5 for controlling the inflow of circulating hydrogen. The ejector valve seat 2 is provided with a large flow nozzle 63 and a small flow nozzle 62, and the large flow nozzle 63 and the small flow nozzle 62 are provided with nozzle sealing rings 64. The closing plate 19 is provided with an ejector hydrogen pressure sensor 20, and the ejector body 61 is provided with an ejector hydrogen temperature sensor 21 for monitoring the state of circulating hydrogen between the ejector and the water outlet valve block.

[0047] Under the condition of low hydrogen demand flow, the fresh hydrogen primary flow is heated once through the plate heat exchanger 1, and then injected into the ejector small flow channel by the small flow nozzle 62 after passing through the ejector valve seat 2. After the circulating hydrogen enters the circulating hydrogen gas-liquid separation flow channel 72 of the anode gas-liquid separator body 71 through the upper stack circulating hydrogen inlet 11 and the lower stack circulating hydrogen inlet 12, the water in the circulating hydrogen is separated, and then enters the ejector small flow flow channel in the ejector body 61 through the small flow secondary flow joint 14 through the anode gas-liquid separator small flow outlet 10 on the anode gas-liquid separator cover plate 75, and is ejected and mixed by the fresh hydrogen primary flow, and flows into the fuel cell stack toward the upper stack hydrogen outlet 83 and the lower stack hydrogen outlet 84 through the hydrogen flow channel 82 composed of the ejector assembly 6○7 and the waterway outlet valve block assembly 8 respectively;

[0048] Under the working condition of medium flow rate of hydrogen demand, the fresh hydrogen primary flow hydrogen is heated once through the plate heat exchanger 1, and is ejected into the ejector large flow flow channel by the large flow nozzle 63 after passing through the ejector valve seat 2. After the circulating hydrogen enters the circulating hydrogen gas-liquid separation flow channel 72 of the anode gas-liquid separator body 71 through the upper stack circulating hydrogen inlet 11 and the lower stack circulating hydrogen inlet 12, the water in the circulating hydrogen is separated, and then enters the ejector large flow flow channel in the ejector body 61 through the large flow secondary flow joint 13 through the anode gas-liquid separator large flow outlet 9 on the anode gas-liquid separator cover plate 75, and is ejected and mixed by the fresh hydrogen primary flow hydrogen, and flows into the interior of the fuel cell through the hydrogen flow channel 82 composed of the ejector assembly 6 and the waterway outlet valve block assembly 8 to the upper stack hydrogen outlet 83 and the lower stack hydrogen outlet 84 respectively;

[0049] Under the condition of high hydrogen flow demand, the fresh hydrogen primary flow hydrogen is heated once through the plate heat exchanger 1, and is ejected into the ejector large and small flow channels by the small flow nozzle 62 and the large flow nozzle 63 after passing through the ejector valve seat 2. After the circulating hydrogen enters the circulating hydrogen gas-liquid separation flow channel 72 of the anode gas-liquid separator body 71 through the upper stack circulating hydrogen inlet 11 and the lower stack circulating hydrogen inlet 12, the moisture in the circulating hydrogen is separated, and then enters the ejector large and small flow channels in the ejector body 61 through the anode gas-liquid separator small flow outlet 10 and the anode gas-liquid separator large flow outlet 9 on the anode gas-liquid separator cover plate 75 and the small flow secondary flow joint 14 and the large flow secondary flow joint 13, and is ejected and mixed by the fresh hydrogen primary flow hydrogen, and flows into the upper stack hydrogen outlet 83 and the lower stack hydrogen outlet 84 through the hydrogen flow channel 82 composed of the ejector assembly 6 and the waterway outlet valve block assembly 8 respectively.

[0050] The fresh hydrogen primary flow hydrogen is heated once through the plate heat exchanger 1, enters the ejector assembly 6 through the ejector valve seat 2, and the circulating hydrogen enters the ejector body 61 through the hydrogen post-processing module, and is ejected and mixed by the fresh hydrogen primary flow hydrogen. The mixed hydrogen flows into the fuel cell stack through the hydrogen flow channel 82 composed of the ejector assembly 6 and the water outlet valve block assembly 8, respectively, to the upper stack hydrogen outlet 83 and the lower stack hydrogen outlet 84. The hydrogen flow channel 82 is arranged on the upper layer of the water outlet valve block fuel cell stack internal coolant outflow channel 86. The water outlet valve block fuel cell stack internal coolant outflow channel 86 is the fuel cell stack internal coolant outflow channel 86. The coolant temperature is relatively high, and the hydrogen supplied in the upper hydrogen flow channel 82 can be heated for the second time to prevent the water carried in the supplied hydrogen from condensing when it is cold and flowing into the fuel cell stack, causing flooding of the front of the fuel cell stack.

[0051] The technical effect of the present invention is as follows: a double ejector structure is used to replace a hydrogen circulation pump plus an ejector structure, thereby reducing the cost of a single fuel cell; the hydrogen supplied by the hydrogen system is heated once by a plate heat exchanger 1, and then flows into the double ejector flow channel according to supply demand through a proportional valve 5 integrated in an ejector valve seat 2, and the double ejector ejects the circulating hydrogen in the system supply again, and after mixing, flows into the fuel cell stack through a hydrogen flow channel 82 composed of an ejector assembly 6 and a water outlet valve block assembly 8, and the hydrogen flow channel 82 composed of an ejector assembly 6 and a water outlet valve block assembly 8 is arranged at the fuel cell stack cooling channel 82. On the coolant outlet 85 flow channel, the high-temperature coolant discharged from the stack is used to reheat the supplied hydrogen to avoid condensation of water in the hydrogen when it is cold; the supplied hydrogen is used to exchange heat with the high-temperature coolant discharged from the stack to reduce the coolant temperature, thereby reducing the circulation and heat dissipation requirements of the fuel cell for the thermal management system; the gas-liquid separator is used to separate the excess hydrogen supply into gas and liquid to reduce the water content in the hydrogen; the highly integrated ejector valve seat 2, double ejectors, gas-liquid separator and other components are used to improve the integration of the hydrogen system, improve the compactness of the fuel cell and the volume power and mass power indicators.

[0052] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A dual-stack hydrogen fuel cell hydrogen system integrated structure, characterized by: The invention comprises an ejector assembly (6) provided with double ejectors, an anode gas-liquid separator assembly (7) being provided on the ejector assembly (6), a water outlet valve block assembly (8) for preheating gas being provided on the ejector assembly (6), and a flow channel (86) for outflow of coolant inside the stack being provided in the water outlet valve block assembly (8).

2. A dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 1, characterized in that: The water outlet valve block assembly (8) comprises a water outlet valve block body (81) connected to the ejector assembly (6), a hydrogen flow channel (82) is arranged in the water outlet valve block body (81), the stack internal coolant outflow channel (86) is arranged in the water outlet valve block body (81), a heat exchange plate (87) is arranged between the hydrogen flow channel (82) and the stack internal coolant outflow channel (86), and the stack internal coolant outflow channel (86) is connected to the stack.

3. A dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 2, characterized in that: The hydrogen flow channel (82) is cap-shaped, the stack internal coolant outflow channel (86) is U-shaped, the hydrogen flow channel (82) and the stack internal coolant outflow channel (86) partially overlap on a vertical plane, and the stack internal coolant outflow channel (86) is connected to a coolant outlet (85).

4. The dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 1, characterized in that: The ejector assembly (6) comprises an ejector body (61), on which a double ejector flow channel is provided, wherein the double ejector flow channel is divided into a large flow flow channel and a small flow flow channel, and both the large flow flow channel and the small flow flow channel are connected to the anode gas-liquid separator assembly (7).

5. A dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 1 or 4, characterized in that: The anode gas-liquid separator assembly (7) comprises an anode gas-liquid separator body (71), the anode gas-liquid separator body (71) is connected to a circulating hydrogen inlet and an ejector assembly (6), a gas-liquid separation flow channel (72) containing circulating hydrogen is provided in the anode gas-liquid separator body (71), and the gas-liquid separation flow channel (72) is arranged between the circulating hydrogen inlet and the ejector assembly (6).

6. A dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 5, characterized in that: The gas-liquid separation flow channel (72) is divided into a gas mixing section, a gas-liquid separation section and a discharge section, and the circulating hydrogen inlet is divided into an upper pile circulating hydrogen inlet (11) and a lower pile circulating hydrogen inlet (12). The upper pile circulating hydrogen inlet (11) and the lower pile circulating hydrogen inlet (12) are respectively connected to the two ends of the gas mixing section, and the gas-liquid separation section is connected to the middle of the gas mixing section.

7. A dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 6, characterized in that: The gas mixing section is in a folded shape, the gas-liquid separation section is in a U shape, the discharge section is in an S shape, a partition plate (73) is provided inside the anode gas-liquid separator body (71), an opening is provided on the partition plate (73) at the bottom, and a drain valve (74) is provided at the bottom end of the anode gas-liquid separator body (71).

8. A dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 7, characterized in that: The partition plate (73) is divided into an upper partition plate and a lower partition plate, the lower partition plate is U-shaped, the upper partition plate is folded, the end of the upper partition plate is located in the U-shaped opening of the lower partition plate, an extension plate is provided at the corner end of the upper partition plate, a baffle plate is provided between the lower partition plate and the anode gas-liquid separator body (71), and a gap exists between the baffle plate and the lower partition plate.

9. The dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 5, characterized in that: The anode gas-liquid separator body (71) is provided with an anode gas-liquid separator cover plate (75), the anode gas-liquid separator cover plate (75) is provided with an anode gas-liquid separator outlet, the anode gas-liquid separator outlet is provided with a secondary flow joint and a secondary flow joint sealing ring (15), and the anode gas-liquid separator outlet is connected to the ejector assembly (6).

10. The dual-stack hydrogen fuel cell hydrogen system integrated structure according to claim 4, characterized in that: The end of the ejector body (61) is provided with a closing plate (19) covering the water outlet valve block assembly (8), the large flow channel and the small flow channel are both connected to the water outlet valve block assembly (8), the other end of the ejector body (61) is provided with an ejector valve seat (2), the ejector valve seat (2) is provided with a large flow nozzle (63) and a small flow nozzle (62), and the large flow nozzle (63) and the small flow nozzle (62) are provided with nozzle sealing rings (64).

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