Sealing assembly and fuel cell system incorporating the same

Description

BACKGROUND OF THE DISCLOSURE Field of the disclosure

[0001] The present disclosure relates to a fuel cell humidifier including a gasket assembly and more particularly, the gasket assembly can be manufactured with improved productivity and can dramatically reduce maintenance costs.Related Art

[0002] A fuel cell is a power generation type cell that produces electricity by combining hydrogen and oxygen. Unlike general chemical cells such as dry cells and storage batteries, fuel cells can continuously produce electricity as long as hydrogen and oxygen are supplied, and there is no heat loss, so the efficiency is about twice that of an internal combustion engine.

[0003] In addition, since chemical energy generated by the combination of hydrogen and oxygen is directly converted into electrical energy, the emission of pollutants is small. Accordingly, the fuel cell has the advantage of being environmentally friendly and reducing concerns about resource depletion due to increased energy consumption.

[0004] These fuel cells are largely based on the type of electrolyte used: a polymer electrolyte membrane fuel cell (PEMFC), a phosphoric acid fuel cell (PAFC), a molten carbonate fuel cell (MCFC), a solid oxide fuel cell (SOFC), an alkaline fuel cell (AFC), or the like. KR 101 697 998 B1 relates to relates to a membrane humidifier, and more specifically, to a membrane humidifier in which a sealing member is interposed between a housing portion and a potting portion that secures the end of the hollow fiber membrane bundle to the housing portion. WO 2020 / 262911 A1 relates to a humidifier for fuel cells and a method of manufacturing the same, and more specifically, to a humidifier that not only can reliably prevent gas leakage due to repeated operation and stopping of a fuel cell, but can also be manufactured with relatively low manufacturing costs and high productivity. WO 2020 / 213990 A1 relates to a humidifier for fuel cells and a packing member therefor, and more specifically, to a humidifier for fuel cells and a packing member therefor that can not only be manufactured with improved productivity but also can dramatically reduce maintenance costs. DE 30 32 417 A1 relates to a heat and mass transfer apparatus comprising hollow synthetic polymer fibres as the heat exchanger tubes and being intended for medicinal purposes. KR 2019 0081736 A relates to a fuel cell membrane humidifier capable of performing an airtight function in a high temperature / high pressure / high humidity environment by a mechanical assembly structure. KR 2019 0138528 A relates to a fuel cell membrane humidifier, and more particularly, to a fuel cell membrane humidifier capable of performing an airtight function in a high temperature / high pressure / high humidity environment by a mechanical assembly structure. KR 2013 0034404 A relates to to a humidifier for a fuel cell, and more particularly, to a humidifier for a fuel cell that ensures operational reliability even in harsh environments such as polar regions and tropical regions.

[0005] Each of these fuel cells operates on the same principle, but the type of fuels used, operating temperatures, catalysts, electrolytes, or the like are different from each other. Among them, the polymer electrolyte fuel cell (PEMFC) can be operated at a low temperature compared to other fuel cells and can be miniaturized due to a high output density, and thus, the polymer electrolyte fuel cell (PEMFC) is known to be the most promising not only in small-scale stationary power generation equipment but also in transportation systems.

[0006] One of the most important factors in improving performance of the polymer electrolyte fuel cell (PEMFC) is to maintain a moisture content by supplying more than a certain amount of moisture to a polymer electrolyte membrane or a proton exchange membrane (PEM) of a membrane-electrode assembly (MEA). This is because when the polymer electrolyte membrane is dried, the power generation efficiency is rapidly reduced.

[0007] As a method of humidifying the polymer electrolyte membrane, there are 1) a bubbler humidification method of supplying moisture by causing a target gas to pass through a diffuser after filling a pressure-resistant container with water, 2) a direct injection method of calculating an amount of supplied moisture required for a fuel cell reaction and supplying moisture directly to a gas flow pipe through a solenoid valve, and 3) a humidification membrane method of supplying moisture to a fluidized bed of gas using a polymer membrane.

[0008] Among them, in the membrane humidification method, water vapor is supplied to the air supplied to the polymer electrolyte membrane using a membrane that selectively transmits only water vapor contained in an off-gas, and thus, in the membrane humidification method of humidifying the polymer electrolyte membrane, it is possible to reduce weight and a size of the humidifier.

[0009] When the selective permeable membranes used in the membrane humidification method form a module, a hollow fiber membrane having a large permeation area per unit volume is preferable. That is, when a humidifier is manufactured using the hollow fiber membrane, high integration of the hollow fiber membrane with a large contact surface area is possible. Accordingly, the fuel cell can be sufficiently humidified even with a small capacity, low-cost materials can be used, and the moisture and heat contained in the off-gas discharged at high temperature from the fuel cell can be collected and reused in the humidifier.

[0010] FIG. 1 is an exploded perspective view illustrating a fuel cell humidifier according to the related art. As illustrated in FIG. 1, a fuel cell humidifier 100 of the related art is a humidification module 110 includes a humidifying module 110 in which moisture exchange occurs between air supplied from the outside and an off-gas discharged from the fuel cell stack (not illustrated), and caps 120 coupled to both ends of the humidifying module 110.

[0011] One of the caps 120 supplies the air supplied from the outside to the humidification module 110, and the other supplies air humidified by the humidification module 110 to the fuel cell stack.

[0012] The humidification module 110 includes a mid-case 111 having an off-gas inlet 111a and an off-gas outlet 111b and a plurality of hollow fiber membranes 112 within the mid-case 111. Both ends of the bundle of hollow fiber membranes 112 are fixed to a potting portion 113. The potting portion 113 is generally formed by curing a liquid polymer such as a liquid polyurethane resin through a casting method.

[0013] Air supplied from the outside flows along the hollows of the hollow fiber membranes 112. The off-gas introduced into the mid-case 111 through the off-gas inlet 111a is discharged from the mid-case 111 through the off-gas outlet 111b after coming into contact with outer surfaces of the hollow fiber membranes 112. When the off-gas comes into contact with the outer surfaces of the hollow fiber membranes 112, moisture contained in the off-gas penetrates the hollow fiber membranes 112, and thus, humidifies air flowing along the hollows of the hollow fiber membranes 112.

[0014] The inner spaces of the caps 120 are only in fluid communication with the hollows of the hollow fiber membranes 112, and should be completely blocked from the inner space of the mid-case 111. Otherwise, air leakage occurs due to a pressure difference, and thus, an amount of the humidified air supplied to the fuel cell stack is reduced and the power generation efficiency of the fuel cell is reduced.

[0015] In general, as illustrated in FIG. 1, the potting portion 113 to which ends of the plurality of hollow fiber membranes 112 are fixed, and a resin layer 114 between the potting portion 113 and the mid-case 111 block the inner spaces of the caps 120 and the inner space of the mid-case 111 are blocked. Similar to the potting portion 113, the resin layer 114 is generally formed by curing a liquid polymer such as a liquid polyurethane resin through a casting method.

[0016] However, since a casting process for forming the resin layer 114 requires a relatively long process time, productivity of the humidifier 100 is reduced.

[0017] In addition, since the resin layer 114 is adhered to an inner wall of the mid-case 111 as well as the potting portion 113, when a problem occurs in the hollow fiber membrane 112, the entire humidification module 110 should be replaced, and thus, maintenance costs largely increase.

[0018] Moreover, the repeated operation of the fuel cell is highly likely to cause a gap between the resin layer 114 and the mid-case 111. That is, as the operation and stop of the fuel cell are repeated, expansion and contraction of the resin layer 114 occur alternately, and there is a high probability that the resin layer 114 is separated from the mid-case 111 due to a difference in coefficients of thermal expansion between the mid-case 111 and the resin layer 114. As described above, when the gap is generated between the resin layer 114 and the mid-case 111, air leakage occurs due to the pressure difference, and thus, the amount of humidified air supplied to the fuel cell stack is reduced, and the power generation efficiency of the fuel cell is reduced.

[0019] In order to prevent the air leakage due to the occurrence of the gap between the resin layer 114 and the mid-case 111, it may be considered to perform an additional process such as applying a sealant between the resin layer 114 and the mid-case 111 and / or mounting an outer gasket assembly therebetween. However, the additional process itself also requires additional process time, and thus, the productivity of the humidifier 100 is reduced.SUMMARY

[0020] The present invention is defined by the subject-matter of the attached claims. The present disclosure provides a gasket assembly that can prevents problems due to the limitations and disadvantages of the related art as described above, can be manufactured with improved productivity, and can dramatically reduce maintenance costs, and a fuel cell humidifier including the same.

[0021] In addition to the above-mentioned aspects of present disclosure, other features and advantages of present disclosure will be described below or will be clearly understood by those of ordinary skill in the art to which present disclosure belongs from such description.ADVANTAGEOUS EFFECTS

[0022] According to the present disclosure, since air leakage between the mid-case and the cap is prevented through mechanical assembly of the gasket assembly, a casting process (that is, a process of injecting and curing a liquid resin into a mold) and an additional sealing process (that is, a process of applying and curing a sealant) of the related art can be omitted. Therefore, according to the present disclosure, it is possible to significantly improve productivity by shortening a production process time of the fuel cell humidifier while preventing the air leakage between the mid-case and the cap.

[0023] In addition, since the gasket assembly of the present disclosure for preventing the air leakage between the mid-case and the cap is mounted on the humidification module 210 through mechanical assembly, when an abnormality occurs in a specific portion of the humidification module, the gasket assembly is simply separated mechanically, and then only the corresponding portion can be repaired or replaced. Therefore, according to the present disclosure, a maintenance cost of the fuel cell humidifier can be significantly reduced.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is an exploded perspective view illustrating a fuel cell humidifier according to the related art. FIG. 2 is an exploded perspective view illustrating a fuel cell humidifier including a gasket assembly according to a first embodiment of the present disclosure. FIG. 3 is an exploded cross-sectional view illustrating the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure. FIG. 4 is a cross-sectional view illustrating the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure. FIG. 5 is an exploded cross-sectional view illustrating a fuel cell humidifier including a gasket assembly according to a second embodiment of the present disclosure. FIG. 6 is an exploded cross-sectional view illustrating a fuel cell humidifier including a gasket assembly according to a third embodiment of the present disclosure. FIG. 7 is a cross-sectional view illustrating various applications of the gasket assemblies according to embodiments of the present disclosure. FIG. 8 is a cross-sectional view illustrating a second embodiment of the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure. FIG. 9 is a cross-sectional view illustrating a third embodiment of the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure. FIG. 10 is an exploded perspective view illustrating a fourth embodiment of a fuel cell humidifier including a gasket assembly according to a fourth embodiment of the present disclosure. FIG. 11 is an exploded cross-sectional view illustrating the fourth embodiment of the fuel cell humidifier including the gasket assembly according to the fourth embodiment of the present disclosure. FIG. 12 is a cross-sectional view illustrating the fourth embodiment of the fuel cell humidifier including the gasket assembly according to the fourth embodiment of the present disclosure. FIG. 13 is a cross-sectional view illustrating a fifth embodiment of the fuel cell humidifier including the gasket assembly according to the fourth embodiment of the present disclosure. DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0025] Since the present disclosure can have various modifications and can include various embodiments, specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present disclosure to specific embodiments.

[0026] The terms used in the present disclosure are only used to describe specific embodiments, and are not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present disclosure, terms such as "comprise" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and it is to be understood that the terms do not preclude possibilities of presences or additions of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Hereinafter, a gasket assembly and a fuel cell humidifier including the same according to embodiments of the present disclosure will be described with reference to the drawings.

[0027] FIG. 2 is an exploded perspective view illustrating a fuel cell humidifier including a gasket assembly according to a first embodiment of the present disclosure, FIG. 3 is an exploded cross-sectional view illustrating the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure, and FIG. 4 is a cross-sectional view illustrating the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure.

[0028] Referring to FIG. 2, a fuel cell humidifier 200 according to an embodiment of the present disclosure includes a humidification module 210 for humidifying air supplied from the outside with moisture in an off-gas discharged from the fuel cell stack. Each of both ends of the humidification module 210 is coupled to a cap 220.

[0029] One of the caps 220 supplies air supplied from the outside to the humidification module 210, and the other supplies air humidified by the humidification module 210 to the fuel cell stack.

[0030] The humidification module 210 is a device in which moisture exchange occurs between the air supplied from the outside and the off-gas, and may include a mid-case 211 having an off-gas inlet 211a and an off-gas outlet 211b and at least one cartridge 212 which is disposed in the mid-case 211.

[0031] The mid-case 211 and the cap 220 may each independently be formed of a rigid plastic or metal, and may have a circular or polygonal cross-section in a width direction. A circle includes an ellipse, and a polygon includes a polygon with rounded corners. For example, the rigid plastic may be polycarbonate, polyamide (PA), polyphthalamide (PPA), polypropylene (PP), or the like.

[0032] The cartridge 212 as presently claimed includes a plurality of hollow fiber membranes 212a and a potting portion 212b for fixing the hollow fiber membranes 212a to each other. Accordingly, ends of the hollow fiber membranes 212a are fixed to the potting portion 212b.

[0033] Each of the hollow fiber membranes 212a may include polysulfone resin, polyethersulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride (PVDF) resin, polyacrylonitrile (PAN) resin, polyimide resin, polyamideimide resin, a polyester imide resin, or a polymer film formed of a mixture of at least two or more thereof, and the potting portion 212b may be formed by curing a liquid resin such as a liquid polyurethane resin through a casting method such as deep potting or centrifugal potting.

[0034] Air supplied from the outside flows along hollows of the hollow fiber membranes (212a). The off-gas introduced into the mid-case 211 through the off-gas inlet 211a comes into contact with outer surfaces of the hollow fiber membranes 212a and then is discharged from the mid-case 211 through the off-gas outlet 211b. When the off-gas comes into contact with the outer surfaces of the hollow fiber membranes 212a, moisture contained in the off-gas penetrates the hollow fiber membranes 212a to humidify the air flowing along the hollows of the hollow fiber membranes 212a.

[0035] The cap 220 is only in fluid communication with the hollows of the hollow fiber membranes 212a, and should be completely blocked from an inner space S of the mid-case 211. Otherwise, air leakage occurs due to the pressure difference, and thus, an amount of humidified air supplied to the fuel cell stack is reduced and power generation efficiency of the fuel cell is reduced.

[0036] To solve this problem, the fuel cell humidifier 200 of the present disclosure further includes a gasket assembly 230 which is airtightly coupled to each end of the humidification module 210 through mechanical assembly.

[0037] According to the present disclosure, since air leakage between the mid-case 211 and the cap 220 is prevented through the mechanical assembly of the gasket assembly 230, a casting process (that is, a process of injecting and curing a liquid resin into a mold) and an additional sealing process (that is, a process of applying and curing a sealant) of the related art may be omitted. Therefore, according to the present disclosure, it is possible to significantly improve productivity by shortening a production process time of the fuel cell humidifier 200 while preventing air leakage between the mid-case 211 and the cap 220.

[0038] In addition, since the gasket assembly 230 of the present disclosure for preventing the air leakage between the mid-case 211 and the cap 220 is mounted on the humidification module 210 through mechanical assembly, when an abnormality occurs in a specific portion (for example, cartridge 212) of the humidification module 210, the gasket assembly 230 is mechanically separated from the humidification module 210, and then only the corresponding portion can be repaired or replaced. Therefore, according to the present disclosure, a maintenance cost of the fuel cell humidifier 200 can be significantly reduced.

[0039] Referring to FIGS. 3 and 4, the gasket assembly 230 according to the first embodiment of the present disclosure includes a packing portion 231, an edge portion 232, and a sealing portion 233. Each of the packing portion 231 and the edge portion 232 may be formed of an elastic material (for example, silicone, rubber, or the like)) having a first hardness of 20 to 70 Shore A, preferably 30 to 60 Shore A. The sealing portion 233 may include at least one of a solid sealing material and a liquid sealing material. The solid sealing material may be made of a material such as silicone, acrylic rubber, EPDM, or NBR, and the liquid sealing material may be made of a material such as silicone or urethane.

[0040] The packing portion 231 has a hole H into which the end (for example, the potting portion 212b) of the cartridge 212 is inserted, and is interposed between the mid-case 211 and the cartridge 212. The packing portion 231 includes a body member 231a and a protruding member 231b.

[0041] The body member 231a has the hole H into which the end (for example, the potting portion 212b) of the cartridge 212 is inserted, and the hole H has a shape corresponding to a shape of the end of the cartridge 212. A lower body member 231aa protruding from the body member 231a toward the mid-case 211 may have a polygonal cross-section (for example, a trapezoidal shape), and an upper body member 231ab formed toward the cap 220 may be formed in a planar shape. A space in which the sealing portion 233 is disposed is formed between the lower body member 231aa and the cartridge potting portion 212b. Moreover, a groove G into which the end 211a of the mid-case 211 is fitted is formed between the lower body member 231aa and the edge portion 232.

[0042] The protruding member 231b is formed at one end of the body member 231a to be in contact with the cartridge potting portion 212b inserted into the hole H. The protruding member 231b may be at least one annular protrusion protruding from one end of the body member 231a. The protruding member 231b may be in contact with the cartridge potting portion 212b while pressing the cartridge potting portion 212b by an elastic force to airtightly seal the space of the mid-case 211 and the space by the cap 220. Accordingly, the protruding member 231b may prevent a fluid in the mid-case 211 from flowing into the space formed on the cap 220 side. In addition, since the protruding member 231b has elasticity, the protruding member 231b can perform a vibration-absorbing function, and thus, it is possible to prevent damage due to vibrations of the humidifier 200.

[0043] The edge portion 232 is formed at the other end of the body member 231a. The edge portion 232 may be interposed in a space formed by the groove 211b formed at the end of the mid-case and an end 220a of the cap. The edge portion 232 may include edge wings 232a and 232b protruding in both directions. The edge wings 232a and 232b may be formed in a longitudinal direction of the humidification module 210. At the time of assembling, the edge wings 232a and 232b are inserted into the grooves 211b of the mid-case end, and the end portion 220a of the cap presses the edge wing 232b and then fastened and assembled by fastening means such as bolts B. In this case, since the edge wings 232a and 232b are made of an elastic material, the edge wings 232a and 232b may be interposed while filling a certain portion of the space of the groove 211b at the end of the mid-case. Fastening fragments 211c and 220c having fastening holes for fastening bolts may be formed on the end side surfaces of the mid-case 211 and the cap 220. The edge wings 232a and 232b may seal the inside and outside of the mid-case 211 and the mid-case 211 and the cap 220 by airtightly sealing the groove 211b of the end portion of the mid-case.

[0044] The sealing portion 233 is formed to be in contact with the cartridge 212 and the packing portion 231 between the cartridge 212 and the packing portion 231. Specifically, the sealing portion 233 is formed to be in contact with (or adhere) the potting portion 212b of the cartridge and the lower body member 231aa of the packing portion at the same time. The sealing portion 233 airtightly seals the space of the mid-case 211 and the space of the cap 220 to prevent the fluid in the mid-case 211 from flowing toward the cap 220.

[0045] In addition, the gasket assembly 230 may further include a reinforcing member 234. The reinforcing member 234 may have a second hardness higher than the first hardness. For example, the reinforcing member 234 may be formed of a metal, a thermoplastic resin, or a thermosetting resin. The reinforcing member 234 may be formed by being inserted into the gasket assembly 230 and formed by manufacturing the reinforcing member 234 after inserting the metal plate into the mold when the gasket assembly 230 is molded. The reinforcing member 234 may be formed by being inserted into at least a portion of the packing portion 231 and at least a portion of the edge portion 232. The reinforcing member 234 may be formed in a portion (a portion in which the groove G is formed) vulnerable to deformation in the gasket assembly 230. The reinforcing member 234 having a higher hardness than those of the packing portion 231 and the edge portion 232 prevents the deformation of the body member 231a when the gasket assembly 230 is mechanically assembled to the humidification module 210 or when the humidifier is operated, and thus, it is possible to more reliably prevent the air leakage.

[0046] Next, gasket assemblies according to various embodiments of the present disclosure will be described with reference to FIGS. 5 to 7. FIG. 5 is an exploded cross-sectional view illustrating a fuel cell humidifier including a gasket assembly according to a second embodiment of the present disclosure, FIG. 6 is an exploded cross-sectional view illustrating a fuel cell humidifier including a gasket assembly according to a third embodiment of the present disclosure, and FIG. 7 is a cross-sectional view illustrating various applications of the gasket assemblies according to embodiments of the present disclosure.

[0047] Referring to FIGS. 5 to 7, each of the gasket assemblies according to various embodiments of the present disclosure includes the packing portion 231, the edge portion 232, and the sealing portion 233. In embodiments of FIGS. 5 to 7, only the position of the sealing portion 233 is different, and the rest of the configuration is substantially the same, and thus, repeated description will be omitted.

[0048] In the embodiment of Figure 5, the sealing portion 233 is formed to be in contact with the potting portion 212b of the cartridge and the upper body member 231ab of the packing portion at the same time.

[0049] In the embodiment of Figure 6 and as presently claimed, the sealing portion 233 is formed so as to be in contact with the potting portion 212b of the cartridge and the protruding member 231b of the packing portion at the same time. In this case, two or more protruding members 231b are formed, and the sealing portion 233 is formed between two or more protruding members 231b.

[0050] FIG. 7 illustrates that the sealing portion 233 is formed to be in contact with at least one of the lower body member 231aa, the upper body member 231ab, and the protruding member 231b of the packing portion.

[0051] In the above embodiments, the sealing portion 233 airtightly seals the space of the mid-case 211 and the space of the cap 220 to prevent the fluid in the mid-case 211 from flowing to the cap 220 side, and thus, each area in which the sealing portion 233 is formed may implement a first sealing area.

[0052] In addition, as presently claimed, the protruding member 231b is in contact with the cartridge potting portion 212b while pressing the cartridge potting portion 212b to airtightly seal the space of the mid-case 211 and the space by the cap 220, and thus, an area in which the protruding member 231b is formed implements a second sealing area.

[0053] In addition, in the above embodiments, the edge wings 232a and 232b airtightly seal the groove 211b of the mid-case end portion to seal the inside and outside of the mid-case 211, and the mid-case 211 and the cap 220, an area in which the edge wings 232a and 232b are formed may implement a third sealing area.

[0054] As described above, in the embodiments, since the sealing area is formed in a double triple, it is possible to reliably prevent air leakage between the mid-case 211 and the cap 220.

[0055] Next, a second embodiment of the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure will be described with reference to FIG. 8. FIG. 8 is a cross-sectional view illustrating the second embodiment of the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure.

[0056] As illustrated in FIG. 8, in a fuel cell humidifier 200a according to the second embodiment of the present disclosure, except that (i) the inner space of the mid-case 211 is divided into a first space S1 and a second space 2 by partitions 211c and (ii) the cartridge 212 further includes an inner case 212c, the fuel cell humidifier 200a is substantially the same as the fuel cell humidifier 200.

[0057] The inner case 212c has an opening at each end and the hollow fiber membranes 212a are contained inside the inner case 212c. The potting portion 212b in which the end portions of the hollow fiber membranes 212a are potted closes the opening of the inner case 212c.

[0058] As illustrated in FIG. 8, at least a portion of the potting portion 212b may be located outside the inner case 212c, and the protruding member 231b of the gasket assembly 230 may be in close contact with the potting portion 212b.

[0059] The inner case 212c includes a plurality of holes (hereinafter, "first mesh holes") MH1 arranged in a mesh shape for fluid communication with the first space s1 and a plurality of holes (hereinafter, "second mesh holes") arranged in a mesh shape for fluid communication with the second space S2.

[0060] The off-gas introduced into the first space S1 of the mid-case 211 through the off-gas inlet 211a flows into the inner case 212c through the first mesh holes MH1, and comes into contact with the outer surfaces of the hollow fiber membranes 212a. Subsequently, the off-gas deprived of moisture is introduced into the second space S2 through the second mesh holes MH2 and then discharged from the mid-case 211 through the off-gas outlet 211c.

[0061] In the cartridge 212 including the inner case 212c, it is possible to easily assemble to the mid-case 211 and easily replace the mid-case 211.

[0062] Next, a third embodiment of the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure will be described with reference to FIG. 9. FIG. 9 is a cross-sectional view illustrating the third embodiment of the fuel cell humidifier including the gasket assembly according to the first embodiment of the present disclosure.

[0063] As illustrated in FIG. 9, in a fuel cell humidifier 200b according to the third embodiment of the present disclosure, except that the entire potting portion 212b is located in the inner case 212c and the protruding member 231b of the gasket assembly 230 is in close contact with the inner case 212c rather than the potting portion 212b, the fuel cell humidifier 200b is substantially the same as the fuel cell humidifier 200a according to the second embodiment described above.

[0064] FIGS. 4, 8, and 9 illustrate the fuel cell humidifiers 200, 200a, and 200b including the gasket assembly according to the first embodiment, but the embodiments of the present disclosure are not limited thereto, and the gasket assemblies according to various embodiments of FIGS. 5 to 7 may be applied to the fuel cell humidifier of the first to third embodiments.

[0065] Next, a fourth embodiment of a fuel cell humidifier including a gasket assembly according to a fourth embodiment of the present disclosure will be described with reference to FIGS. 10 to 12. FIG. 10 is an exploded perspective view illustrating the fourth embodiment of the fuel cell humidifier including the gasket assembly according to the fourth embodiment of the present disclosure, FIG. 11 is an exploded cross-sectional view illustrating the fourth embodiment of the fuel cell humidifier including the gasket assembly according to the fourth embodiment of the present disclosure, and FIG. 12 is a cross-sectional view illustrating the fourth embodiment of the fuel cell humidifier including the gasket assembly according to the fourth embodiment of the present disclosure.

[0066] Referring to FIGS. 10 to 12, in a fuel cell humidifier 300 according to the fourth embodiment to which a gasket assembly 330 according to the fourth embodiment of the present disclosure is applied, except that (i) the humidification module 210 includes two or more cartridges 212, (ii) the body member 231a of the packing portion 231 includes two or more holes H into which the cartridges 212 are inserted, (iii) two or more protruding members 231b formed at one end of the body member 231a to be in contact with the cartridge potting portion 212b are provided, and (iv) two or more sealing portions 233 formed to be in contact with the cartridge 212 and the packing portion 231 between the cartridge 212 and the packing portion 231 are provided, the fuel cell humidifier 300 is substantially the same as the fuel cell humidifier 200a according to the second embodiment described above.

[0067] The plurality of cartridges 212 each including the inner case 212c are mounted in the mid-case 211 at regular intervals. Accordingly, the off-gas is uniformly distributed to all the hollow fiber membranes 212a present in the mid-case 211, and only a specific cartridge 212 in which a problem occurs can be selectively replaced so that the maintenance cost of the fuel cell humidifier 300 can be further reduced.

[0068] FIG. 13 schematically illustrates a cross-sectional view of the fuel cell humidifier 300a according to the fifth embodiment of the fuel cell humidifier to which the gasket assembly 330 according to the fourth embodiment of the present disclosure is applied.

[0069] As illustrated in FIG. 13, in the fuel cell humidifier 300a according to the fifth embodiment of the present disclosure, except that the entire potting portion 212b of each cartridge 212 is located in the corresponding inner case 212c and the protruding members 231b of the gasket assembly 330 are in close contact with the inner cases 212c rather than the potting portions 212b, the fuel cell humidifier 300a is substantially the same as the fuel cell humidifier 300 according to the above-described fourth embodiment.

[0070] Hereinbefore, embodiments of the present disclosure are described, but those of ordinary skill in the art can variously modify and change the present disclosure through addition, modification, deletion of components within a scope that does not depart from scope of the attached claims.[Detailed Description of Main Elements]

[0071] 10, 200, 200a, 200b, 300, 300a:fuel cell humidifier210:humidification module211:mid-case211a:off-gas inlet211b:off-gas outlet211c:partition212:cartridge212a:hollow fiber membrane212b:potting portion212c:inner case220:cap230, 330:gasket assembly231:packing portion231a:body member231b:protruding member232:edge portion233:sealing portion234:reinforcing member

Claims

1. A fuel cell humidifier (200) comprising: a mid-case (211); a cap (220) fastened to the mid-case (211); at least one cartridge (212) disposed in the mid-case (211) and accommodating a plurality of hollow fiber membranes (212a); and a gasket assembly (230) airtightly coupled to at least one end of a humidification module (210) through mechanical assembly so that the cap (220) is in fluid communication with only the hollow fiber membranes (212a), the gasket assembly (230) includes: a packing portion (231) including a body member (231a) having a hole into which an end portion of the cartridge (212) is inserted and two or more protruding members (231b) formed at one end of the body member (231a), an edge portion (232) formed at the other end of the body member (231a) and formed in a space formed by a groove formed in the end portion of the mid-case (211) and the end portion of the cap (220), and a sealing portion (233) formed to be in contact with the cartridge (212) and the packing portion (231) to prevent the fluid in the mid-case (211) from flowing to the cap side, wherein the body member (231a) includes a lower body member (231aa) formed to protrude the mid-case side and an upper body member (231ab) formed in a flat surface shape toward the cap side, the cartridge (212) includes the plurality of hollow fiber membranes (212a) and a potting portion (212b) for fixing the hollow fiber membranes (212a) to each other and ends of the hollow fiber membranes (212a) are fixed to the potting portion (212b), wherein the two or more protruding members (231b) are in contact with the potting portion (212b) inserted into the hole (H) to prevent a fluid in the mid-case (211) from flowing to the cap side, wherein the sealing portion (233) is formed so as to be in contact with the potting portion (212b) and the two or more protruding members (231b) at the same time, wherein the sealing portion (233) is formed between two or more protruding members (231b), and wherein the protruding members (231b) are in contact with the cartridge potting portion (212b) while pressing the cartridge potting portion (212b) to airtightly seal the space of the mid-case (211) and the space by the cap (220), and thereby, areas in which the protruding members (231b) are formed implement further sealing areas.

2. The fuel cell humidifier (200) of claim 1, wherein the body member (231a) includes two or more holes (H) into which two or more cartridges (212) are inserted, the two or more protruding members (231b) are provided and formed to be in contact with end portions of the two or more cartridges (212), and two or more sealing portions (233) are provided and formed to be in contact with each of the two or more cartridges (212) and the packing portion (231).

3. The fuel cell humidifier (200) of any one of claim 1 and claim 2, wherein the edge portion (232) includes edge wings (232a, 232b) protruding in both directions, and the edge wing (232a, 232b) is disposed to fill the groove formed at an end portion of the mid-case (211), and seals an inside and an outside of the mid-case (211) and the cap (220).