A fuel cell stack and membrane humidifier integrated structure

Abstract

The application relates to a fuel cell stack and membrane humidifier integrated structure, which comprises a first end plate, a membrane humidifier, a second end plate, a stack core and a core end plate, wherein the first end plate, the membrane humidifier, the second end plate, the stack core and the core end plate are pressed together by a pressing part, the membrane humidifier comprises a plurality of axially stacked modular humidifying units, the membrane humidifier is provided with a wet air inlet common manifold channel, a wet air outlet common manifold channel, a dry air inlet common manifold channel and a dry air outlet common manifold channel which axially penetrate all the modular humidifying units, the first end plate is provided with a first flow channel hole and a second flow channel hole, and the second end plate is provided with a third flow channel hole and a fourth flow channel hole, so that the integration degree and operation reliability can be improved.

Description

Technical Field

[0001] This invention relates to the field of fuel cells, and more particularly to an integrated structure that combines a fuel cell stack and a membrane humidifier. Background Technology

[0002] Currently, in vehicle-mounted fuel cell systems, membrane humidifiers and fuel cell stacks are generally arranged separately. The humidifier is equipped with a separate encapsulation shell, mounting bracket, and independent fasteners. The fuel cell stack and the humidifier are two independent assembly units, and the two are connected by a large number of external pipelines and connectors to complete the gas path.

[0003] The drawbacks of the existing technology's separate and independent arrangement of the membrane humidifier and fuel cell stack are as follows: 1. Low integration and poor space utilization. Separate arrangement of the humidifier and stack requires additional independent housings, mounting brackets, and numerous connecting pipes. The large number of components and scattered overall layout result in a large overall size and weight, making it difficult to meet the miniaturization, lightweighting, and compactness requirements of on-board fuel cells. 2. Complex gas path and high system flow resistance. In the separate structure, the stack and humidifier are connected by multiple external pipes and connectors. The numerous bends and interfaces create multiple airflow throttling and abrupt changes, significantly increasing the overall gas path flow resistance of the cathode circuit. This directly leads to increased air compressor workload, higher parasitic power consumption, and reduced overall fuel cell operating efficiency. 3. Numerous assembly steps and weak structural vibration resistance. 4. The fuel cell stack and humidifier are assembled and fixed separately, resulting in multiple assembly steps and large cumulative assembly tolerances. The continuous vibration in vehicle-mounted conditions makes external piping and connectors prone to loosening and leakage, limiting the overall operational stability and lifespan of the unit. 5. The overall modularity is low, leading to insufficient adaptability to different operating conditions. Conventional external humidifiers have a fixed overall structure, making it impossible to flexibly adjust the water vapor exchange area according to different fuel cell stack output power and real-time load. Low loads can easily lead to excessive intake humidity causing fuel cell stack flooding, while high loads can easily lead to insufficient humidification causing proton exchange membrane drying, failing to meet the stable operation requirements of the fuel cell stack under all operating conditions. 6. The engineering support costs are relatively high. The split structure has many exposed pipes. To adapt to the high-pressure and humid operating environment of vehicles, special protective designs are required for pipes and connectors, further increasing the overall engineering support costs. Taking a typical 60kW on-board fuel cell system as an example, existing split-type humidifiers require 3-5 external stainless steel corrugated pipes, 6-10 quick connectors and clamps between the humidifier and the fuel cell stack. The total length of the piping is approximately 800mm-1500mm, with at least 4 bends. The local resistance losses introduced by these external pipes and connectors account for approximately 20%-35% of the total flow resistance in the cathode circuit, directly causing the air compressor to consume an additional 3%-8% of the system's net output power to overcome these pipe losses. As the system power increases to over 100kW, the number of pipes and the proportion of flow resistance will further increase.

[0004] Therefore, it is necessary to provide an integrated structure that combines a fuel cell and a membrane humidifier to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide an integrated structure for fuel cell stacks and membrane humidifiers that can improve integration and operational reliability.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an integrated structure of a fuel cell stack and a membrane humidifier, comprising: a first end plate, a membrane humidifier, a second end plate, a stack core, and a core end plate. The first end plate, the membrane humidifier, the second end plate, the stack core, and the core end plate are pressed together by a clamping member. The membrane humidifier comprises: a plurality of axially stacked modular humidification units. Each modular humidification unit includes a dry air flow field plate, a humid air flow field plate, and a humidification membrane located between the dry air flow field plate and the humid air flow field plate. In two adjacent modular humidification units, the dry air flow field plate of one modular humidification unit is bonded to the humidified air flow field plate of the other modular humidification unit to form an assembly. The dry air flow field plate has several dry air channels on its side near the humidification membrane to form a dry air flow field, and the humidified air flow field plate has several humidified air channels on its side near the humidification membrane to form a humidified air flow field. The membrane humidifier has a humidified air inlet common manifold channel that axially penetrates all modular humidification units and a humidified air outlet common manifold channel. The system includes a humidified air intake manifold, a dry air exhaust manifold, and a humidified air intake manifold. The humidified air intake manifold and the humidified air exhaust manifold are respectively connected to the humidified air flow field of all modular humidification units. The dry air intake manifold and the dry air exhaust manifold are respectively connected to the dry air flow field of all modular humidification units. The second end plate is disposed between the membrane humidifier and the fuel cell stack core. The first end plate is disposed at the end of the membrane humidifier away from the fuel cell stack core. The core end plate is disposed at the end of the fuel cell stack core away from the membrane. At the humidifier end, the first end plate is provided with a first flow channel hole and a second flow channel hole. The first flow channel hole is connected to the humid air outlet common manifold channel of the membrane humidifier, and the second flow channel hole is connected to the dry air inlet common manifold channel of the membrane humidifier. The second end plate is provided with a third flow channel hole and a fourth flow channel hole. The third flow channel hole is connected to the cathode inlet of the fuel cell stack core and the dry air outlet common manifold channel of the membrane humidifier, respectively. The fourth flow channel hole is connected to the cathode exhaust outlet of the fuel cell stack core and the humid air inlet common manifold channel of the membrane humidifier, respectively.

[0007] Preferably, the integrated structure of fuel cell stack and membrane humidifier in this invention is further configured such that: the first end plate, the dry air flow field plate of the membrane humidifier, the wet air flow field plate of the membrane humidifier, the humidifying membrane of the membrane humidifier, the second end plate, the bipolar plate of the stack core, the membrane electrode of the stack core and the stack core end plate are all arranged in parallel.

[0008] Preferably, the integrated structure of fuel cell stack and membrane humidifier in this invention is further configured such that: the clamping component is a screw and a nut, and the four corners and / or the middle of the sides of the integrated structure are provided with holes that cooperate with the screw.

[0009] Preferably, the integrated structure of fuel cell stack and membrane humidifier in this invention is further configured such that the clamping member is a strap.

[0010] Preferably, the integrated structure of fuel cell stack and membrane humidifier in this invention is further configured such that the flow direction of dry air in the dry air flow field and the flow direction of humid air in the humid air flow field adopt co-current, counter-current or cross-current.

[0011] Preferably, the integrated structure of fuel cell stack and membrane humidifier in this invention is further configured such that: a plurality of reinforcing ribs are provided on the walls of the first flow channel hole, the second flow channel hole, the third flow channel hole and the fourth flow channel hole to form a cage-like reinforcing rib, and the extending direction of the reinforcing rib is consistent with the direction of the gas flowing through the flow channel hole.

[0012] Preferably, the integrated structure of fuel cell stack and membrane humidifier in the present invention is further configured such that: in the membrane humidifier, at least one set of tenon and mortise positioning components is provided between each two adjacent components, and the tenon and mortise positioning components include protrusions and grooves.

[0013] Preferably, the integrated structure of fuel cell stack and membrane humidifier in this invention is further configured such that the first end plate and the second end plate are made of epoxy resin glass fiber composite material, polyphenylene sulfide, polyetherimide or nylon.

[0014] Preferably, the integrated structure of fuel cell stack and membrane humidifier in this invention is further configured such that: the humid air intake manifold channel, the humid air outlet manifold channel, the dry air intake manifold channel, and the dry air outlet manifold channel are provided with guide vanes or throttling plates in the first flow channel hole, the second flow channel hole, the third flow channel hole and the fourth flow channel hole to ensure uniform airflow distribution.

[0015] Preferably, the integrated structure of fuel cell stack and membrane humidifier in the present invention is further configured such that: a sealing structure is provided between the first end plate and the membrane humidifier, and sealing structures are provided between the second end plate and the membrane humidifier, and between the second end plate and the stack core.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Axial integrated stacking significantly improves the overall integration of the machine. This invention stacks the membrane humidifier and the fuel cell stack core coaxially along the axis and uses a common fuel cell stack clamping screw to achieve overall locking. This eliminates the independent shell, dedicated bracket, and numerous scattered fasteners of the membrane humidifier, significantly reducing the number of parts and effectively lowering the overall size and weight of the equipment. This aligns with the development trend of miniaturization, lightweighting, and compactness of vehicle-mounted fuel cells.

[0017] 2. The end plate has a built-in integrated air passage, which significantly reduces airflow resistance. By relying on the through-type gas passage (i.e. flow channel hole) of the first end plate and the second end plate, the gas is directly connected between the stack and the membrane humidifier, completely eliminating the external pipes and pipe joints of the traditional split structure, eliminating the throttling losses caused by pipe bends and interfaces, the airflow path is short and the flow channel is smooth, the overall flow resistance of the cathode circuit is significantly reduced, effectively reducing the air compressor load, reducing the parasitic power consumption of the system, and improving the overall operating energy efficiency of the fuel cell.

[0018] 3. Integrated press-fit structure improves assembly efficiency and vibration resistance reliability. The integrated assembly of the fuel cell stack and membrane humidifier simplifies on-site assembly procedures and reduces cumulative assembly tolerances. The membrane humidifier is uniformly pressed at both ends by end plates, ensuring symmetrical axial force and even load distribution on the seals. Under vehicle-mounted vibration conditions, issues such as unilateral pressure or leaking pipes will not occur. The overall structural rigidity and vibration resistance are significantly improved, extending the equipment's service life.

[0019] 4. Modular membrane humidifier design significantly improves system scalability and versatility. The membrane humidifier of the present invention adopts a stacked structure of multiple modular humidification units. Each modular humidification unit has an independent air path interface. The same integrated architecture can cover a wide power range of 30kW to 200kW by configuring different numbers of modular humidification units at the factory, without the need to redesign the humidification system for each power level.

[0020] 5. Equipped with insulating end plates to optimize automotive engineering applications. In this invention, the first and second end plates are made of insulating materials, and on the basis of the integrated structure, an electrical isolation barrier is formed simultaneously to separate the high-voltage stack, membrane humidifier and external pipelines, avoiding high-voltage creepage and leakage problems under humid conditions. There is no need to select expensive special insulating pipelines, reducing the difficulty of vehicle matching and overall cost, and further improving the engineering practicality of the product. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the integrated structure of the fuel cell stack and membrane humidifier in this invention.

[0022] Figure 2 This is a schematic diagram of the membrane humidifier in this invention.

[0023] Figure 3 This is a schematic diagram of the structure of a single modular humidification unit in this invention.

[0024] Figure 4 This is a schematic diagram of the structure of the humid air flow field plate in this invention.

[0025] Figure 5 This is a schematic diagram of the dry air flow field plate in this invention.

[0026] Figure 6 This is a structural diagram of the mortise and tenon positioning assembly used between each pair of adjacent components in this invention.

[0027] Figure 7 This is a schematic diagram of the structure of the first end plate in this invention.

[0028] Figure 8 This is a schematic diagram of the structure of the second end plate in this invention.

[0029] Figure 9 This is a schematic diagram of the structure in which a cage-like reinforcing rib is provided inside the third flow channel hole in this invention.

[0030] Figure 10 This is a schematic diagram of the gas flow direction structure in this invention.

[0031] Figures 1 to 10In the middle: 1. First end plate, 10. First flow channel hole, 11. Second flow channel hole, 110. Reinforcing rib, 2. Membrane humidifier, 20. Modular humidification unit, 200. Dry air flow field plate, 2000. Dry air flow channel, 201. Humid air flow field plate, 2010. Humid air flow channel, 202. Humidification membrane, 21. Humid air inlet common manifold channel, 22. Humid air outlet common manifold channel, 23. Dry air inlet common manifold channel, 24. Dry air outlet common manifold channel, 3. Second end plate, 30. Third flow channel hole, 31. Fourth flow channel hole, 4. Fuel cell stack core, 5. Core end plate, 6. Screw, 7. Assembly, 8. Tenon and mortise positioning assembly, 80. Protrusion, 81. Groove. Detailed Implementation

[0032] The following detailed description of the integrated structure of fuel cell stack and membrane humidifier according to the present invention is provided through specific embodiments.

[0033] Please see Figures 1 to 10 An integrated structure of a fuel cell stack and membrane humidifier includes: a first end plate 1, a membrane humidifier 2, a second end plate 3, a stack core 4, and a core end plate 5. The thickness of the first end plate and the second end plate is 20mm~50mm. The first end plate 1 and the second end plate 3 are made of epoxy resin glass fiber composite material, polyphenylene sulfide, polyetherimide, or nylon. The insulating material simultaneously forms an electrical isolation barrier to separate the high-voltage stack, the membrane humidifier 2, and external pipelines, avoiding high-voltage creepage and leakage problems under humid conditions. The first end plate 1, the membrane humidifier 2, the second end plate 3, the stack core 4, and the core end plate 5 are pressed together by clamping components. In this embodiment, the clamping components are screws 6 and nuts. There are six screws 6, and the screws 6 are made of stainless steel or high-strength alloy steel. The first end plate 1, the membrane humidifier 2, the second end plate 3, the fuel cell stack core 4, and the core end plate 5 all have holes at their four corners and the middle of their sides that mate with the screw 6. Of course, in other embodiments, the clamping component can also be a strap, which can also achieve the present invention. The present invention simplifies the piping structure and improves integration and operational reliability by having the membrane humidifier 2 and the fuel cell stack core 4 share a set of clamping components for overall assembly. The integrated structure is stacked along the axial direction of the screw. During assembly, the first end plate, the membrane humidifier, the second end plate, the fuel cell stack core, and the core end plate are stacked axially on the pressing platform in sequence. The screw is inserted from one end, passes through the holes of the above-mentioned parts in sequence, and then comes out from the other end. Locking nuts are tightened at both ends of the screw to apply axial clamping force. The range of the axial clamping force is 10kN~50kN, which is precisely applied by controlling the tightening torque of the locking nuts with a torque wrench.

[0034] The membrane humidifier 2 includes several axially stacked modular humidification units 20. The number of modular humidification units 20 can be flexibly configured according to the power level of the fuel cell stack to adjust the overall water-air exchange area. Each modular humidification unit 20 includes a dry air flow field plate 200, a humid air flow field plate 201, and a humidification membrane 202 located between the dry air flow field plate 200 and the humid air flow field plate 201. The first end plate 1, the dry air flow field plate 200, the humid air flow field plate 201, the humidification membrane 202, the second end plate 3, the bipolar plates of the fuel cell stack core 4, the membrane electrode assembly of the fuel cell stack core 4, and the core end plate 5 are all arranged in parallel. The membrane electrode assembly typically consists of a proton exchange membrane, a catalyst layer, and a gas diffusion layer. In each pair of adjacent modular humidification units 20, the dry air flow field plate 200 of one modular humidification unit 20 is bonded to the humid air flow field plate 201 of the other modular humidification unit 20 to form an assembly 7. At least one set of tenon and mortise positioning components 8 is provided between each pair of adjacent assemblies 7. The tenon and mortise positioning components 8 include protrusions 80 and grooves 81. In this embodiment, there are two tenon and mortise positioning components 8, which are respectively arranged diagonally. The dry air flow field plate 200 has several dry air flow channels 2000 on the side near the humidification film 202 to form a dry air flow field, and the humid air flow field plate 201 has several humid air flow channels 2010 on the side near the humidification film 202 to form a humid air flow field. In this embodiment, the flow direction of the dry air in the dry air flow field and the flow direction of the humid air in the humid air flow field are co-current. Of course, in other embodiments, the flow direction of the dry air in the dry air flow field and the flow direction of the humid air in the humid air flow field can also be counter-current or cross-current.The membrane humidifier 2 is provided with a humid air inlet common manifold channel 21, a humid air outlet common manifold channel 22, a dry air inlet common manifold channel 23, and a dry air outlet common manifold channel 24 that axially penetrate all modular humidification units 20. The humid air inlet common manifold channel 21 and the humid air outlet common manifold channel 22 are respectively connected to the humid air flow field of all modular humidification units 20, and the dry air inlet common manifold channel 23 and the dry air outlet common manifold channel 24 are respectively connected to the dry air flow field of all modular humidification units 20. The second end plate 3 is disposed between the membrane humidifier 2 and the fuel cell stack core 4, and the first end plate 1 is disposed on the side of the membrane humidifier 2 furthest from the fuel cell stack core 4. The first end plate 5 is located at the end of the fuel cell core 4 furthest from the membrane humidifier 2. The first end plate 1 has a first flow channel hole 10 and a second flow channel hole 11. The first flow channel hole 10 is connected to the humid air outlet common manifold channel 22 of the membrane humidifier 2, and the second flow channel hole 11 is connected to the dry air inlet common manifold channel 23 of the membrane humidifier 2. The second end plate 3 has a third flow channel hole 30 and a fourth flow channel hole 31. The third flow channel hole 30 is connected to the cathode inlet of the fuel cell core 4 and the dry air outlet common manifold channel 24 of the membrane humidifier 2, respectively. The fourth flow channel hole 31 is connected to the cathode exhaust outlet of the fuel cell core 4 and the humid air inlet common manifold channel 21 of the membrane humidifier 2, respectively. Several reinforcing ribs 110 are provided on the wall of the second flow channel hole 11 to form a cage-like reinforcing rib. The extending direction of the reinforcing ribs 110 is consistent with the direction of the gas flowing through the flow channel hole. The reinforcing ribs 110 enhance structural strength, and these cage-like reinforcing ribs are provided in the first flow channel hole 10, the third flow channel hole 30, and the fourth flow channel hole 31. The humid air intake manifold channel 21, the humid air outlet manifold channel 22, the dry air intake manifold channel 23, and the dry air outlet manifold channel 24, as well as the first flow channel hole 10, the second flow channel hole 11, the third flow channel hole 30, and the fourth flow channel hole 31, are equipped with guide vanes or throttling orifice plates (not shown) to ensure uniform airflow distribution. In this embodiment, the first flow channel hole 10, the second flow channel hole 11, the third flow channel hole 30, and the fourth flow channel hole 31 are all rectangular, with a single-side length controlled within the range of 30mm to 50mm. Of course, in other embodiments, the first flow channel hole 10, the second flow channel hole 11, the third flow channel hole 30, and the fourth flow channel hole 31 can also be circular, with a diameter controlled within the range of 30mm to 50mm.

[0035] A sealing structure is provided between the first end plate 1 and the membrane humidifier 2, and sealing structures are also provided between the second end plate 3 and the membrane humidifier 2, and between the second end plate 3 and the fuel cell stack core 4. In this embodiment, a sealing ring is provided between the first end plate 1 and the membrane humidifier 2, between the second end plate 3 and the membrane humidifier 2, and between the second end plate 3 and the fuel cell stack core 4. Of course, in other embodiments, the mating surfaces of the first end plate 1 and the membrane humidifier 2 are coated with liquid sealant, the mating surfaces of the second end plate 3 and the membrane humidifier 2 are coated with liquid sealant, and the mating surfaces of the second end plate 3 and the fuel cell stack core 4 are coated with liquid sealant, which can also achieve the present invention.

[0036] Please see Figure 10 In this invention, the integrated airflow path of the complete integrated structure is as follows: the dry air output from the air compressor first enters the second flow channel hole 11 of the first end plate 1, and then enters the dry air flow field of each modular humidification unit 20 through the dry air intake common manifold channel 23 of the membrane humidifier 2. The high-humidity cathode exhaust gas discharged from the fuel cell stack first enters the fourth flow channel hole 31 of the second end plate 3, and then enters the humid air flow field of each modular humidification unit 20 through the humid air intake common manifold channel 21 of the membrane humidifier 2. Then, the dry air and humid air on both sides of the humidification membrane 202 in each modular humidification unit 20 complete the water vapor transfer. The humidified dry air flows back into the cathode inlet of the fuel cell stack core 4 through the dry air outlet common manifold channel 24 on the membrane humidifier 2 and the third flow channel hole 30 on the second end plate 3 to participate in the reaction. The humid air after heat exchange is discharged through the humid air outlet common manifold channel 22 on the membrane humidifier 2 and the first flow channel hole 10 on the first end plate 1.

[0037] In summary, the integrated structure of the fuel cell stack and membrane humidifier in this invention achieves axial integrated stacking, significantly improving the overall integration. Furthermore, the integrated gas path built into the end plate greatly reduces the gas path flow resistance. In addition, the integrated press-fit structure greatly improves assembly efficiency and vibration resistance reliability. This invention also significantly improves system scalability and versatility through the modular membrane humidifier design.

[0038] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

Claims

1. An integrated structure for a fuel cell stack and a membrane humidifier, characterized in that: include: A first end plate, a membrane humidifier, a second end plate, a fuel cell stack core, and a core end plate are assembled together by clamping components. The membrane humidifier comprises several axially stacked modular humidification units. Each modular humidification unit includes a dry air flow field plate, a humidified air flow field plate, and a humidification membrane located between the dry air flow field plate and the humidified air flow field plate. In every two adjacent modular humidification units, the dry air flow field plate of one of the modular humidification units is connected to the humidified air flow field plate. Another modular humidification unit's humidified airflow field plate is bonded together to form an assembly. The dry airflow field plate has several dry air channels on its side near the humidification membrane to form a dry airflow field. The humidified airflow field plate also has several humidified air channels on its side near the humidification membrane to form a humidified airflow field. The membrane humidifier is equipped with a humidified air inlet common manifold channel, a humidified air outlet common manifold channel, a dry air inlet common manifold channel, and a dry air outlet common manifold channel that axially penetrate all modular humidification units. The common manifold channels, namely the humidified air inlet common manifold channel and the humidified air outlet common manifold channel, are respectively connected to the humidified air flow field of all modular humidification units. The dry air inlet common manifold channel and the dry air outlet common manifold channel are respectively connected to the dry air flow field of all modular humidification units. The second end plate is disposed between the membrane humidifier and the fuel cell stack core. The first end plate is disposed at the end of the membrane humidifier away from the fuel cell stack core. The stack core end plate is disposed at the end of the fuel cell stack core away from the membrane humidifier. One end plate is provided with a first flow channel hole and a second flow channel hole. The first flow channel hole is connected to the common manifold channel for the humidified air outlet of the membrane humidifier, and the second flow channel hole is connected to the common manifold channel for the dry air inlet of the membrane humidifier. The second end plate is provided with a third flow channel hole and a fourth flow channel hole. The third flow channel hole is connected to the cathode inlet of the fuel cell stack core and the common manifold channel for the dry air outlet of the membrane humidifier, respectively. The fourth flow channel hole is connected to the cathode exhaust outlet of the fuel cell stack core and the common manifold channel for the humidified air inlet of the membrane humidifier, respectively.

2. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: The first end plate, the dry air flow field plate of the membrane humidifier, the wet air flow field plate of the membrane humidifier, the humidifying membrane of the membrane humidifier, the second end plate, the bipolar plate of the fuel cell stack core, the membrane electrode of the fuel cell stack core, and the core end plate are all arranged in parallel.

3. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: The clamping components are screws and nuts, and the integrated structure has holes at the four corners and / or the middle of the sides that mate with the screws.

4. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: The clamping component is a strap.

5. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: The direction of the dry air flow in the dry air flow field and the direction of the humid air flow in the humid air flow field are either co-current, counter-current, or cross-current.

6. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: The first, second, third, and fourth flow channel holes are provided with a number of reinforcing ribs to form a cage-like reinforcing rib, and the extension direction of the reinforcing ribs is consistent with the direction of the gas flowing through the flow channel hole.

7. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: In a membrane humidifier, at least one set of tenon and mortise positioning components is provided between each pair of adjacent assemblies, and the tenon and mortise positioning components include protrusions and grooves.

8. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: The first end plate and the second end plate are made of epoxy resin glass fiber composite material, polyphenylene sulfide, polyetherimide or nylon.

9. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: The humid air intake manifold, humid air exhaust manifold, dry air intake manifold, and dry air exhaust manifold are equipped with guide vanes or throttling plates in the first flow channel hole, second flow channel hole, third flow channel hole, and fourth flow channel hole to ensure uniform airflow distribution.

10. The integrated structure of fuel cell stack and membrane humidifier as described in claim 1, characterized in that: A sealing structure is provided between the first end plate and the membrane humidifier, and sealing structures are provided between the second end plate and the membrane humidifier, and between the second end plate and the fuel cell stack core.

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