Cartridge for fuel cell humidifier and fuel cell humidifier

Abstract

The present invention relates to a cartridge for a fuel cell humidifier and a fuel cell humidifier, in which the cartridge is provided in the fuel cell humidifier, the fuel cell humidifier humidifies a dry gas to be supplied to a fuel cell stack by using a wet gas, and the cartridge comprises: an inner case having openings at respective ends; an internal inlet formed on the inner housing and configured to introduce a first gas into the inner housing; an internal outlet disposed at a position spaced apart from the internal inlet in the first axial direction, and configured to discharge the first gas from the inside of the inner housing; and a hollow fiber membrane bundle accommodated inside the inner case, in which the hollow fiber membrane bundle includes a plurality of woven hollow fiber membranes formed by weaving at least two hollow fiber membranes.

Description

Technical Field

[0001] The present disclosure relates to a humidifier for a fuel cell, which is configured to supply humidified gas to the fuel cell. Background Art

[0002] The advantages of fuel cells are that, unlike general chemical batteries such as dry cells or storage batteries, fuel cells can generate electricity continuously as long as hydrogen and oxygen are supplied, and that there is no heat loss, so the efficiency of fuel cells is as high as about twice the efficiency of internal combustion engines.

[0003] In addition, fuel cells convert chemical energy generated by combining hydrogen and oxygen directly into electrical energy, thereby emitting a small amount of pollutants. Therefore, fuel cells are advantageous in that they are environmentally friendly and also advantageous in that concerns about resource depletion due to increased energy consumption can be reduced.

[0004] Based on the type of electrolyte used, such fuel cells can be generally classified as polymer electrolyte membrane fuel cells (PEMFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), solid oxide fuel cells (SOFC), or alkaline fuel cells (AFC).

[0005] These fuel cells essentially work based on the same working principle, but differ from each other in the type of fuel used, operating temperature, catalyst and electrolyte. Among these fuel cells, polymer electrolyte membrane fuel cell (PEMFC) is considered to be the most advantageous for transportation systems and small stationary power generation equipment because the polymer electrolyte membrane fuel cell operates at a lower temperature than other fuel cells and the output density of the polymer electrolyte membrane fuel cell is high, thereby miniaturizing the polymer electrolyte membrane fuel cell.

[0006] One of the most important factors for improving the performance of polymer electrolyte membrane fuel cells (PEMFCs) is to supply a predetermined amount or more of water to the polymer electrolyte membrane or proton exchange membrane (PEM) of the membrane electrode assembly (MEA) to maintain the moisture content. The reason is that if the polymer electrolyte membrane or proton exchange membrane dries, the power generation efficiency is drastically reduced.

[0007] The following methods are used as methods for humidifying a polymer electrolyte membrane or a proton exchange membrane: 1) a bubbler humidification method in which a pressure-resistant container is filled with water and a target gas is allowed to pass through a diffuser to supply moisture, 2) a direct injection method in which the amount of moisture required to be supplied for a fuel cell reaction is calculated and moisture is directly supplied to a gas flow pipe through an electromagnetic valve, and 3) a membrane humidification method in which moisture is supplied to a gas fluidized bed using a polymer separation membrane.

[0008] Among these methods, the membrane humidification method uses a membrane configured to selectively transmit only water vapor contained in the exhaust gas to provide water vapor to air supplied to the polymer electrolyte membrane or the proton exchange membrane to humidify the polymer electrolyte membrane or the proton exchange membrane. The membrane humidification method has an advantage in that the weight and size of the humidifier can be reduced.

[0009] When forming a module, a hollow fiber membrane having a large transmission area per unit volume is suitable for a selective permeable membrane used in a membrane humidification method. That is, when a humidifier is manufactured using a hollow fiber membrane, a high degree of integration of a hollow fiber membrane having a large contact area can be achieved, whereby even a small capacity can be sufficiently humidified for a fuel cell, cheap materials can be used, and moisture and heat included in exhaust gas discharged from a fuel cell at a high temperature can be collected and the collected moisture and heat can be reused by the humidifier.

[0010] Figure 1 It is a schematic exploded perspective view of a conventional humidifier for a fuel cell.

[0011] like Figure 1 As shown, a conventional membrane humidification type humidifier 100 includes a humidification module 110 in which moisture is exchanged between air supplied from the outside and exhaust gas exhausted from a fuel cell stack (not shown); and a cover 120 respectively coupled to opposite ends of the humidification module 110.

[0012] One of the covers 120 delivers air supplied from the outside to the humidification module 110 , and the other cover delivers air humidified by the humidification module 110 to the fuel cell stack.

[0013] The humidification module 110 includes an intermediate shell 111 having an exhaust gas inlet 111a and an exhaust gas outlet 111b and a hollow fiber membrane bundle 112 located in the intermediate shell 111. The opposite ends of the hollow fiber membrane bundle 112 are potted in a fixing layer 113. Generally, each fixing layer 113 is formed by hardening a liquid polymer (e.g., a liquid polyurethane resin) using a casting method. The fixing layer 113 in which the ends of the hollow fiber membrane bundle 112 are potted and the resin layer 114 provided between the fixing layer 113 and the intermediate shell 111 isolate the internal space of the cover 120 from the internal space of the intermediate shell 111. Similar to the fixing layer 113, each resin layer 114 is generally formed by hardening a liquid polymer (e.g., a liquid polyurethane resin) using a casting method.

[0014] The air supplied from the outside flows along the hollow portion of the hollow fiber membrane bundle 112. The exhaust gas introduced into the intermediate housing 111 through the exhaust gas inlet 111a contacts the outer surface of the hollow fiber membrane bundle 112, and is discharged from the intermediate housing 111 through the exhaust gas outlet 111b. When the exhaust gas contacts the outer surface of the hollow fiber membrane bundle 112, the moisture contained in the exhaust gas is transmitted through the hollow fiber membrane bundle 112 to humidify the air flowing along the hollow portion of the hollow fiber membrane bundle 112. The humidified air is supplied to the fuel cell stack through the first cover 120 (i.e., one of the covers 120).

[0015] In this case, in the past, due to the pressure of the exhaust gas introduced through the exhaust gas inlet 111a, shaking, vibration, etc. occurred in the hollow fiber membrane bundle 112. As fatigue accumulated in the hollow fiber membrane bundle 112 due to such shaking and vibration, there was a problem in the past that the hollow fiber membrane bundle 112 was damaged or destroyed (for example, cut). In addition, as the hollow fiber membrane bundle 112 repeatedly contacted the intermediate housing 111 due to shaking or vibration, there was a problem in the past that the hollow fiber membrane bundle 112 was damaged, for example, scratched by friction. Summary of the invention

[0016] Technical issues

[0017] The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a cartridge for a humidifier for a fuel cell and a humidifier for a fuel cell capable of reducing the possibility that a hollow fiber membrane bundle is damaged or destroyed due to shaking, vibration, etc.

[0018] Technical Solution

[0019] In order to achieve the above-mentioned object, the present disclosure may include the following structures.

[0020] The cartridge of the humidifier for a fuel cell according to the present disclosure is provided in a humidifier for a fuel cell, the humidifier being configured to humidify dry gas to be supplied to a fuel cell stack using wet gas, and may include: an inner shell having openings formed at opposite ends; an inner inlet formed on the inner shell, the inner inlet being configured to introduce a first gas into the inner shell; an inner outlet being spaced apart from the inner inlet in a first axial direction, the inner outlet being configured to discharge the first gas from the inner shell; and a hollow fiber membrane bundle, the hollow fiber membrane bundle being accommodated in the inner shell. The hollow fiber membrane bundle may include a plurality of braided hollow fiber membranes, each braided hollow fiber membrane being formed by braiding at least two hollow fiber membranes.

[0021] A humidifier for a fuel cell according to the present disclosure may include: a humidification module configured to humidify dry gas to be supplied to a fuel cell stack using a humidified gas; a first cover, the first cover is combined with one end of the humidification module; and a second cover, the second cover is combined with the other end of the humidification module. The humidification module may include an intermediate shell having two open opposite ends and at least one box accommodated in the intermediate shell. The box may include: an inner shell having openings formed at two opposite ends; an internal inlet formed on the inner shell, the internal inlet being configured to introduce a first gas into the inner shell; an internal outlet, the internal outlet being spaced apart from the internal inlet in the first axial direction, the internal outlet being configured to discharge the first gas from the inner shell; and a hollow fiber membrane bundle, the hollow fiber membrane bundle being accommodated in the inner shell. The hollow fiber membrane bundle may include a plurality of braided hollow fiber membranes, each of which is formed by braiding at least two hollow fiber membranes.

[0022] Beneficial Effects

[0023] The present disclosure is implemented to use a braided hollow fiber membrane to reduce the shaking, vibration, etc. that occur in the hollow fiber membrane bundle due to the flow of the first gas introduced into and discharged from the inner shell. Therefore, the present disclosure can reduce the fatigue accumulated in the hollow fiber membrane bundle, thereby reducing the possibility of damage or destruction (e.g., cutting) of the hollow fiber membrane bundle. Therefore, the present disclosure can increase the service life of the hollow fiber membrane bundle, thereby achieving an increase in utilization and a reduction in maintenance costs.

[0024] The present disclosure can use a braided hollow fiber membrane to reduce the number of times the hollow fiber membrane bundle contacts the inner shell due to the flow of the first gas introduced into and discharged from the inner shell. Therefore, the present disclosure can reduce the possibility of damage to the hollow fiber membrane bundle and the inner shell (e.g., scratches caused by friction). Therefore, the present invention can not only extend the service life of the hollow fiber membrane bundle, but also extend the service life of the inner shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic exploded perspective view of a conventional humidifier for a fuel cell.

[0026] Figure 2 is a schematic exploded perspective view of a humidifier for a fuel cell according to the present disclosure.

[0027] Figure 3 FIG. 1 is a diagram showing a humidifier for a fuel cell according to the present disclosure. Figure 2 Schematic dissection view of line II cut.

[0028] Figure 4The humidifier for a fuel cell according to the present disclosure is Figure 2 A schematic cross-sectional view of the combined structure taken along line II.

[0029] Figure 5 and Figure 6 is a schematic plan view of a cartridge for a humidifier for a fuel cell according to the present disclosure.

[0030] Figure 7 A humidifier for a fuel cell according to the present disclosure is provided in the cartridge along Figure 6 A schematic cross-sectional view taken along line II-II.

[0031] Figure 8 is a schematic side view showing a braided hollow fiber membrane in a cartridge of a humidifier for a fuel cell according to the present disclosure.

[0032] Fig. 9 is a schematic side view showing a rolled hollow fiber membrane in a cartridge of a humidifier for a fuel cell according to the present disclosure.

[0033] Fig.10 is a schematic side view showing a non-crimped hollow fiber membrane in a cartridge of a humidifier for a fuel cell according to the present disclosure.

[0034] Fig.11 is a schematic side view showing a three-dimensionally curled hollow fiber membrane in a cartridge of a humidifier for a fuel cell according to the present disclosure.

[0035] Fig.12 is a schematic side view showing a three-dimensionally rolled hollow fiber membrane and a braided hollow fiber membrane in a cartridge of a humidifier for a fuel cell according to the present disclosure.

[0036] Fig.13 is a schematic plan view of a cartridge for a humidifier for a fuel cell according to the present disclosure.

[0037] Fig.14 and Fig.15 is a schematic side view showing a portion of a hollow fiber membrane combined in a cartridge of a humidifier for a fuel cell according to the present disclosure. DETAILED DESCRIPTION

[0038] Hereinafter, an embodiment of a humidifier for a fuel cell according to the present disclosure will be described in detail with reference to the accompanying drawings. The humidifier for a fuel cell according to the present disclosure may include a cartridge for a humidifier for a fuel cell according to the present disclosure. Therefore, the cartridge for a humidifier for a fuel cell according to the present disclosure will also be described while describing the humidifier for a fuel cell according to the present disclosure. On the other hand, in Figure 7 In the figure, the hollow fiber membrane is simply indicated by hatching. Figures 8 to 12 , Fig.14 and Fig.15 The hatching in the figure is for distinguishing each component.

[0039] Reference Figures 2 to 4 According to the present disclosure, a humidifier 1 for a fuel cell is configured to humidify a dry gas to be supplied to a fuel cell stack (not shown) using a humidified gas. The humidified gas can be discharged from the fuel cell stack. The dry gas can be a fuel gas or air. The dry gas can be humidified by the humidified gas and then can be supplied to the fuel cell stack. According to the present disclosure, a humidifier 1 for a fuel cell includes a humidification module 2 configured to humidify the dry gas, a first cover 3 combined with one end of the humidification module 2, and a second cover 4 combined with the other end of the humidification module 2.

[0040] Reference Figures 2 to 4 , the humidification module 2 humidifies the dry gas. The first cover 3 can be combined with one end of the humidification module 2. The second cover 4 can be combined with the other end of the humidification module 2. The humidification module 2 can supply humidified dry gas to the fuel cell stack using the first gas and the second gas. When the first gas is a dry gas, the second gas can be a humidified gas. In this case, the first gas can be humidified by the second gas and then can be supplied to the fuel cell stack. When the first gas is a humidified gas, the second gas can be a dry gas. In this case, the second gas can be humidified by the first gas and then can be supplied to the fuel cell stack.

[0041] The humidification module 2 comprises an intermediate housing 21 and at least one box 22 .

[0042] The box 22 is coupled to the intermediate housing 21. The box 22 may be accommodated in the intermediate housing 21. The opposite ends of the intermediate housing 21 are open. In this case, an accommodating hole 211 may be formed in the intermediate housing 21. The accommodating hole 211 may be formed to extend through the intermediate housing 21 in the first axis direction (X axis direction). At least one box 22 may be disposed in the accommodating hole 211.

[0043] The intermediate housing 21 may include an intermediate body 210. The cartridge 22 is accommodated in the intermediate body 210. The cartridge 22 may be disposed in the intermediate body 210 to be accommodated in the intermediate body 210. At least one cartridge 22 may be accommodated in the intermediate body 210. An accommodation hole 211 may be formed through the intermediate body 210 in a first axis direction (X axis direction).

[0044] The intermediate housing 21 may have an intermediate inlet 212 and an intermediate outlet 213 formed therein. The intermediate inlet 212 may introduce the first gas into the intermediate housing 21. The intermediate outlet 213 may exhaust the first gas from the intermediate housing 21. Each of the intermediate outlet 213 and the intermediate inlet 212 may protrude from the intermediate housing 21.

[0045] The box 22 is arranged in the intermediate shell 21. The box 22 includes a hollow fiber membrane bundle 221. The hollow fiber membrane bundle 221 can be combined with the box 22 to be modularized. Therefore, the hollow fiber membrane bundle 221 can be installed in the intermediate shell 21 by the process of combining the box 22 to the intermediate shell 21. Therefore, in the humidifier 1 for a fuel cell according to the present disclosure, the convenience of installation, separation and replacement of the hollow fiber membrane bundle 221 can be improved. The hollow fiber membrane bundle 221 may include a plurality of hollow fiber membranes.

[0046] The cartridge 22 may include an inner housing 222 .

[0047] The inner housing 222 has openings formed at opposite ends and accommodates the hollow fiber membrane bundle 221. The hollow fiber membrane bundle 221 may be modularized by being disposed in the inner housing 222. The hollow fiber membrane bundle 221 may include a polymer membrane made of polysulfone resin, polyethersulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride (PVDF) resin, polyacrylonitrile (PAN) resin, polyimide resin, polyamideimide resin, polyesterimide resin, or a mixture of two or more thereof.

[0048] The box 22 may include a first fixed layer 223. The first fixed layer 223 is configured to fix one end of the hollow fiber membrane bundle 221. The first fixed layer 223 may close an opening formed at one end of the inner shell 222. In this case, the first fixed layer 223 may be formed to not block the hollow portion of the hollow fiber membrane bundle 221. The first fixed layer 223 may be formed by hardening a liquid resin (e.g., a liquid polyurethane resin) through a casting process. A portion of the first fixed layer 223 may be located in the inner shell 222, and the remainder of the first fixed layer may protrude outward from the inner shell 222. The first fixed layer 223 may fix one end of the hollow fiber membrane bundle 221 to the inner shell 222.

[0049] The box 22 may include a second fixing layer 224. The second fixing layer 224 is configured to fix the other end of the hollow fiber membrane bundle 221. The second fixing layer 224 may close the opening formed at the other end of the inner shell 222. In this case, the second fixing layer 224 may be formed to not block the hollow portion of the hollow fiber membrane bundle 221. The second fixing layer 224 may be formed by hardening a liquid resin (e.g., a liquid polyurethane resin) through a casting process. A portion of the second fixing layer 224 may be located in the inner shell 222, and the remainder of the second fixing layer may protrude outward from the inner shell 222. The second fixing layer 224 may fix the other end of the hollow fiber membrane bundle 221 to the inner shell 222. Since the second fixed layer 224 and the first fixed layer 223 are formed so as not to block the hollow portion of the hollow fiber membrane bundle 221, the second gas can be supplied to the hollow portion of the hollow fiber membrane bundle 221 without being obstructed by the second fixed layer 224 and the first fixed layer 223, and can be discharged from the hollow portion of the hollow fiber membrane bundle 221 without being obstructed by the second fixed layer 224 and the first fixed layer 223.

[0050] Reference Figures 2 to 6 , the box 22 may include an internal inlet 225 and an internal outlet 226.

[0051] The inner inlet 225 is formed on the inner shell 222. The inner inlet 225 may be formed on one side of the inner shell 222. One side of the inner shell 222 may be disposed to face any one side wall of the intermediate shell 21. The inner inlet 225 may introduce the first gas into the inner shell 222. The inner inlet 225 may be formed through the inner shell 222. Figure 5 As shown, the internal inlet 225 can be realized by a through hole formed through the inner shell 222. Figure 6 As shown, the internal inlet 225 can be implemented by a plurality of through holes formed through the inner shell 222. In this case, the internal inlet 225 may include a plurality of inflow windows 225a formed through different portions of the inner shell 222. The inflow windows 225a may be spaced apart from each other in a first axis direction (X axis direction) and a second axis direction (Y axis direction) to form a matrix. The second axis direction (Y axis direction) and the first axis direction (X axis direction) are axis directions arranged perpendicular to each other.

[0052] The inner outlet 226 is formed on the inner shell 222. The inner outlet 226 may be formed on one side of the inner shell 222. The inner outlet 226 may discharge the first gas from the inner shell 222. The inner outlet 226 may be formed through the inner shell 222. Figure 5 As shown, the internal outlet 226 can be realized by a through hole formed through the inner shell 222. Figure 6As shown, the internal outlet 226 can be realized by a plurality of through holes formed through the inner housing 222. In this case, the internal outlet 226 may include a plurality of outflow windows 226a formed through different parts of the inner housing 222. The outflow windows 226a may be spaced apart from each other in the first axis direction (X axis direction) and the second axis direction (Y axis direction) to form a matrix. The internal outlet 226 and the internal inlet 225 may be spaced apart from each other in the first axis direction (X axis direction).

[0053] When the first gas is a humidified gas, the first gas may be supplied to the space between the inner surface of the intermediate housing 21 and the outer surface of the box 22 through the intermediate inlet 212, may be supplied to the box 22 through the internal inlet 225, and may contact the outer surface of the hollow fiber membrane bundle 221. In this process, the moisture contained in the first gas may be transmitted through the hollow fiber membrane bundle 221 to humidify the second gas flowing along the hollow portion of the hollow fiber membrane bundle 221. The humidified second gas may be discharged from the hollow fiber membrane bundle 221 and then may be supplied to the fuel cell stack through the first cover 3 or the second cover 4. After humidifying the second gas, the first gas may be discharged to the space between the outer surface of the box 22 and the inner surface of the intermediate housing 21 through the internal outlet 226, and may be discharged from the intermediate housing 21 through the intermediate outlet 213. In this case, the first gas may be exhaust gas discharged from the fuel cell stack.

[0054] When the first gas is a dry gas, the first gas can be supplied to the space between the inner surface of the intermediate housing 21 and the outer surface of the box 22 through the intermediate inlet 212, can be supplied to the box 22 through the internal inlet 225, and can contact the outer surface of the hollow fiber membrane bundle 221. In this process, the moisture contained in the second gas flowing along the hollow portion of the hollow fiber membrane bundle 221 can be transmitted through the hollow fiber membrane bundle 221 to humidify the first gas introduced into the box 22. The humidified first gas can be discharged to the space between the outer surface of the box 22 and the inner surface of the intermediate housing 21 through the internal outlet 226, can be discharged from the intermediate housing 21 through the intermediate outlet 213, and can be supplied to the fuel cell stack. After humidifying the first gas, the second gas can be discharged from the hollow fiber membrane bundle 221, and then can be discharged to the outside through the first cover 3 or the second cover 4. In this case, the second gas can be the exhaust gas discharged from the fuel cell stack.

[0055] The humidification module 2 may include a first packaging unit 23 .

[0056] The first encapsulation unit 23 is combined with one end of the intermediate housing 21 in an airtight manner by mechanical assembly. Therefore, the first encapsulation unit 23 can ensure that the first cover 3 is in fluid communication only with the hollow fiber membrane bundle 221. Therefore, the first encapsulation unit 23 can prevent direct mixing of the first gas and the second gas. The first encapsulation unit 23 can be arranged between the intermediate housing 21 and the box 22, so as to form a seal between the intermediate housing 21 and the box 22. In this case, the box 22 can be inserted into the first insertion hole 231 formed in the first encapsulation unit 23. The first encapsulation unit 23 can contact each of the inner surface of the intermediate housing 21, the outer surface of the box 22, and the first fixed layer 223. Through this contact, the first encapsulation unit 23 can be combined with one end of the intermediate housing 21 in an airtight manner. In this case, the first encapsulation unit 23 can also contact each of a part of the inner surface of the intermediate housing 21, a part of the outer surface of the box 22, and a part of the first fixed layer 223.

[0057] The humidification module 2 may include a second packaging unit 24 .

[0058] The second packaging unit 24 is airtightly combined with the other end of the intermediate housing 21 by mechanical assembly. Therefore, the second packaging unit 24 can ensure that the second cover 4 is only in fluid communication with the hollow fiber membrane bundle 221. Therefore, the second packaging unit 24 can prevent the direct mixing of the first gas and the second gas. The second packaging unit 24 can be arranged between the intermediate housing 21 and the box 22, so as to form a seal between the intermediate housing 21 and the box 22. In this case, the box 22 can be inserted into the second insertion hole 241 formed in the second packaging unit 24. The second packaging unit 24 can be in contact with each of the inner surface of the intermediate housing 21, the outer surface of the box 22, and the second fixed layer 224. Through this contact, the second packaging unit 24 can be airtightly combined with the other end of the intermediate housing 21. In this case, the second packaging unit 24 can also be in contact with each of a part of the inner surface of the intermediate housing 21, a part of the outer surface of the box 22, and a part of the second fixed layer 224.

[0059] Reference Figures 2 to 4 , the first cover 3 is combined with one end of the humidification module 2. The space between the first cover 3 and the box 22 can be isolated from the space between the box 22 and the intermediate shell 21 by the first packaging unit 23 in an airtight sealed state. The first cover 3 may include a first port 31. The first port 31 is configured to enable the second gas to flow therethrough. The first port 31 may be connected to the hollow portion of the hollow fiber membrane bundle 221. Therefore, in the process of the second gas flowing between the first cover 3 and the hollow fiber membrane bundle 221, the second gas can be introduced or discharged through the first port 31.

[0060] Reference Figures 2 to 4, the second cover 4 is combined with the other end of the humidification module 2. The second cover 4 can be arranged to be spaced apart from the first cover 3 in the first axis direction (X axis direction). The space between the second cover 4 and the box 22 can be isolated from the space between the box 22 and the intermediate housing 21 by the second packaging unit 24 in an airtight sealed state. The second cover 4 may include a second port 41. The second port 41 is configured to enable the second gas to flow therethrough. The second port 41 may be connected to the hollow portion of the hollow fiber membrane bundle 221. Therefore, in the process where the second gas flows between the second cover 4 and the hollow fiber membrane bundle 221, the second gas can be introduced or discharged through the second port 41. When the second gas is introduced through the second port 41, the second gas can be discharged through the first port 31. In this case, the second gas can exchange moisture with the first gas while passing through the second cover 4, the hollow portion of the hollow fiber membrane bundle 221 and the first cover 3 in sequence. When the second gas is discharged through the second port 41, the second gas can be introduced through the first port 31. In this case, the second gas may exchange moisture with the first gas while sequentially passing through the first cover 3, the hollow portion of the hollow fiber membrane bundle 221, and the second cover 4. Although not shown, a resin layer may be formed at opposite ends of the intermediate housing 21 instead of the packaging units 23 and 24. The resin layer may be formed by hardening a liquid polymer (e.g., a liquid polyurethane resin) using a casting method.

[0061] Here, due to the flow of the first gas introduced into the inner shell 222 and discharged from the inner shell 222, the hollow fiber membrane bundle 221 may be shaken, vibrated, etc., and thus the hollow fiber membrane bundle 221 may be damaged or destroyed. In order to reduce the possibility of damage or destruction of the hollow fiber membrane bundle 221, the hollow fiber membrane bundle 221 may include a plurality of braided hollow fiber membranes 2211 ( Figure 8 ).

[0062] Reference Figures 2 to 8 , each braided hollow fiber membrane 2211 is formed by braiding at least two hollow fiber membranes 2211a and 2211b. Since each braided hollow fiber membrane 2211 is formed by braiding a plurality of hollow fiber membranes 2211a and 2211b, the braided hollow fiber membrane can be implemented to have higher durability and strength than a single hollow fiber membrane 2211a. Therefore, the shaking, vibration, etc. of the braided hollow fiber membrane 2211 caused by the flow of the first gas introduced into the inner shell 222 and discharged from the inner shell 222 can be reduced. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can achieve the following effects.

[0063] First, the humidifier 1 for a fuel cell according to the present disclosure can reduce fatigue accumulated in the hollow fiber membrane bundle 221 by using a braided hollow fiber membrane 2211 to reduce shaking, vibration, etc. of the hollow fiber membrane bundle 221 due to the flow of the first gas introduced into the inner shell 222 and discharged from the inner shell 222. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce the possibility of damage or destruction (e.g., cutting) of the hollow fiber membrane bundle 221. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can increase the service life of the hollow fiber membrane bundle 221, thereby achieving an increase in utilization and a reduction in maintenance costs.

[0064] Secondly, the humidifier 1 for a fuel cell according to the present disclosure can use a braided hollow fiber membrane 2211 to reduce the number of times the hollow fiber membrane bundle 221 contacts the inner shell 222 due to the flow of the first gas introduced into the inner shell 222 and discharged from the inner shell 222. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce the possibility of damage to the hollow fiber membrane bundle 221 and the inner shell 222 (for example, scratches caused by friction). Therefore, the humidifier 1 for a fuel cell according to the present disclosure can not only improve the service life of the hollow fiber membrane bundle 221, but also improve the service life of the inner shell 222.

[0065] Figure 8 An embodiment in which a woven hollow fiber membrane 2211 is woven by a first hollow fiber membrane 2211a and a second hollow fiber membrane 2211b is shown, however, the present disclosure is not limited thereto, and the woven hollow fiber membrane 2211 can be woven by more than three hollow fiber membranes. In addition, the woven hollow fiber membrane 2211 can be formed by weaving the same type of hollow fiber membranes, or can be formed by weaving different types of hollow fiber membranes. Here, different types of hollow fiber membranes can refer to hollow fiber membranes that are different in at least one of shape, diameter, and material.

[0066] Reference Figures 2 to 10 , all hollow fiber membranes in the hollow fiber membrane bundle 221 may be implemented as braided hollow fiber membranes 2211. The hollow fiber membrane bundle 221 may be implemented to include different types of hollow fiber membranes. This will be described in detail below.

[0067] First, refer to Figures 2 to 9 The hollow fiber membrane bundle 221 may include curled hollow fiber membranes 2212 .

[0068] The curled hollow fiber membrane 2212 is a curled hollow fiber membrane. The hollow fiber membrane bundle 221 can be implemented to include different types of hollow fiber membranes using the curled hollow fiber membrane 2212 and the braided hollow fiber membrane 2211. As the curled hollow fiber membrane is curled, the curled hollow fiber membrane 2212 can be implemented as a curved hollow fiber membrane. For example, Fig. 9 As shown, the curled hollow fiber membrane 2212 can be formed into a wave pattern. In this case, the curled hollow fiber membrane 2212 can be formed into a zigzag shape that passes through the baseline 2212a multiple times, thereby including multiple peaks and multiple troughs. The hollow fiber membrane bundle 221 can include multiple curled hollow fiber membranes 2212.

[0069] Since the curled hollow fiber membrane 2212 is curled, the curled hollow fiber membrane can have a higher porosity than a non-curled hollow fiber membrane. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can improve the dispersion or diffusivity of the first gas introduced through the internal inlet 225 by using the curled hollow fiber membrane 2212, thereby improving the overall humidification performance. In addition, since the curled hollow fiber membrane 2212 is curled, a larger effective humidification surface area can be achieved compared to a non-curled hollow fiber membrane. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can use the curled hollow fiber membrane 2212 to increase the effective area, and the humidification performance can be further improved by increasing the effective area.

[0070] When the hollow fiber membrane bundle 221 includes a plurality of braided hollow fiber membranes 2211 and a plurality of curled hollow fiber membranes 2212, the braided hollow fiber membranes 2211 may be disposed closer to the internal inlet 225 than the curled hollow fiber membranes 2212. For example, the distance at which the curled hollow fiber membranes 2212 are spaced from the internal inlet 225 may be implemented to be greater than the distance at which the braided hollow fiber membranes 2211 are spaced from the internal inlet 225. The distance at which the curled hollow fiber membranes 2212 are spaced from the internal inlet 225 may refer to the shortest distance at which the curled hollow fiber membranes 2212 disposed closest to the internal inlet 225 among the curled hollow fiber membranes 2212 are spaced from the internal inlet 225 in a straight line. The distance by which the braided hollow fiber membrane 2211 is spaced from the internal inlet 225 may refer to the shortest distance by which the braided hollow fiber membrane 2211 disposed closest to the internal inlet 225 among the braided hollow fiber membranes 2211 is spaced from the internal inlet 225 in a straight line.

[0071] As described above, the humidifier 1 for a fuel cell according to the present disclosure can achieve the following effects by implementing the braided hollow fiber membrane 2211 to be disposed closer to the inner inlet 225 than the rolled hollow fiber membrane 2212 .

[0072] First, because the braided hollow fiber membrane 2211 having higher durability and strength than the curled hollow fiber membrane 2212 is disposed closer to the inner inlet 225, the humidifier 1 for a fuel cell according to the present disclosure can reduce shaking, vibration, etc. of the hollow fiber membrane bundle 221 due to the flow of the first gas introduced through the inner inlet 225. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce fatigue accumulated in the hollow fiber membrane bundle 221 due to the flow of the first gas introduced through the inner inlet 225, thereby reducing the possibility of damage or destruction (e.g., cutting) of the hollow fiber membrane bundle 221.

[0073] Secondly, the humidifier 1 for a fuel cell according to the present disclosure can reduce the number of times the woven hollow fiber membrane 2211 contacts the inner shell 222 due to the flow of the first gas introduced through the internal inlet 225, and even if the woven hollow fiber membrane contacts the inner shell 222, damage to the woven hollow fiber membrane 2211 can be reduced.

[0074] When the hollow fiber membrane bundle 221 includes a plurality of braided hollow fiber membranes 2211 and a plurality of curled hollow fiber membranes 2212, the braided hollow fiber membranes 2211 may be disposed in the first region 222a ( Figure 7 The curled hollow fiber membrane 2212 may be disposed in a second region 222b ( Figure 7 ). Therefore, the braided hollow fiber membrane 2211 can be arranged on the outside relative to the curled hollow fiber membrane 2212. The curled hollow fiber membrane 2212 can be arranged on the inside relative to the braided hollow fiber membrane 2211. The first region 222a can be arranged relative to the second region 222b in the first direction (the direction of the FD arrow, Figure 7 The first direction (the direction of the FD arrow) is the direction from the hollow fiber membrane bundle 221 toward the internal inlet 225.

[0075] When the hollow fiber membrane bundle 221 includes a plurality of braided hollow fiber membranes 2211 and a plurality of curled hollow fiber membranes 2212, the braided hollow fiber membranes 2211 may be disposed closer to the internal outlet 226 than the curled hollow fiber membranes 2212. For example, the distance at which the curled hollow fiber membranes 2212 are spaced from the internal outlet 226 may be implemented to be greater than the distance at which the braided hollow fiber membranes 2211 are spaced from the internal outlet 226. The distance at which the curled hollow fiber membranes 2212 are spaced from the internal outlet 226 may refer to the shortest distance at which the curled hollow fiber membranes 2212 disposed closest to the internal outlet 226 among the curled hollow fiber membranes 2212 are spaced from the internal outlet 226 in a straight line. The distance by which the braided hollow fiber membrane 2211 is spaced from the internal outlet 226 may refer to the shortest distance by which the braided hollow fiber membrane 2211 disposed closest to the internal outlet 226 among the braided hollow fiber membranes 2211 is spaced from the internal outlet 226 in a straight line.

[0076] As described above, the humidifier 1 for a fuel cell according to the present disclosure can reduce shaking, vibration, etc. of the hollow fiber membrane bundle 221 due to the flow of the first gas discharged through the internal outlet 226 by implementing the braided hollow fiber membrane 2211 to be arranged closer to the internal outlet 226 than the curled hollow fiber membrane 2212. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce the fatigue accumulated in the hollow fiber membrane bundle 221 due to the flow of the first gas discharged through the internal outlet 226, thereby reducing the possibility of damage or destruction (such as cutting) of the hollow fiber membrane bundle 221. In addition, the humidifier 1 for a fuel cell according to the present disclosure can reduce the number of times the braided hollow fiber membrane 2211 contacts the inner shell 222 due to the flow of the first gas discharged through the internal outlet 226, and even if the braided hollow fiber membrane contacts the inner shell 222, damage to the braided hollow fiber membrane 2211 can be reduced.

[0077] On the other hand, when the braided hollow fiber membrane 2211 is disposed in the first region 222a and the curled hollow fiber membrane 2212 is disposed in the second region 222b, the braided hollow fiber membrane 2211 may be disposed closer to both the internal inlet 225 and the internal outlet 226 than the curled hollow fiber membrane 2212 .

[0078] like Fig. 9As shown, each curled hollow fiber membrane 2212 can be curled to have a wavelength 2212b of 10 millimeters (mm) to 20 mm. Wavelength 2212b can refer to the distance between one crest and another crest of each curled hollow fiber membrane 2212 in the longitudinal direction. If wavelength 2212b is implemented as less than 10 mm, the curled hollow fiber membrane 2212 may cause an excessive increase in the pressure difference between the opposite ends of the box 22. If wavelength 2212b is implemented as greater than 20 mm, the curled hollow fiber membrane 2212 may not be able to achieve outstanding differences in terms of dispersion or diffusivity of the first gas and effective area compared to non-curled hollow fiber membranes. In view of this, the humidifier 1 for a fuel cell according to the present disclosure is provided with a curled hollow fiber membrane 2212 curled to have a wavelength 2212b of 10 mm to 20 mm, thereby reducing the risk of damage or destruction of the hollow fiber membrane bundle 221 due to the pressure difference between the opposite ends of the box 22, and improving the humidification performance by increasing the dispersion or diffusivity of the first gas and the effective area. Each curled hollow fiber membrane 2212 can be implemented to have a uniform wavelength 2212b as a whole. Each curled hollow fiber membrane 2212 can be implemented to have a non-uniform wavelength 2212b as a whole.

[0079] Each curled hollow fiber membrane 2212 can be curled to have an amplitude 2212c of more than 0.1mm. Here, the distance between the peak and the baseline 2212a can correspond to the amplitude 2212c. The distance between the trough and the baseline 2212a can also correspond to the amplitude 2212c. If the amplitude 2212c is implemented as less than 0.1mm, the curled hollow fiber membrane 2212 may not be able to achieve outstanding differences in terms of the dispersion or diffusivity of the first gas and the effective area compared to the non-curled hollow fiber membrane. In view of this, the humidifier 1 for a fuel cell according to the present disclosure can be provided with a curled hollow fiber membrane 2212 curled to have an amplitude 2212c of more than 0.1mm, thereby improving the humidification performance by improving the dispersion or diffusivity of the first gas and the effective area. Each curled hollow fiber membrane 2212 can be implemented as a whole with an uneven amplitude 2212c. Although not shown, each of the curled hollow fiber membranes 2212 may be implemented to have a uniform amplitude 2212c as a whole.

[0080] Next, refer to Figures 2 to 10 , the hollow fiber membrane bundle 221 may include non-curled hollow fiber membranes 2213 .

[0081] The non-curled hollow fiber membrane 2213 is a hollow fiber membrane that is not curled. The hollow fiber membrane bundle 221 may be implemented to include different types of hollow fiber membranes, including a non-curled hollow fiber membrane 2213 and a braided hollow fiber membrane 2211. The hollow fiber membrane bundle 221 may include a plurality of non-curled hollow fiber membranes 2213. Fig.10 As shown, each non-crimped hollow fiber membrane 2213 may be a straight hollow fiber membrane that is not crimped.

[0082] When the hollow fiber membrane bundle 221 includes a plurality of braided hollow fiber membranes 2211 and a plurality of non-curled hollow fiber membranes 2213, the braided hollow fiber membranes 2211 may be disposed closer to the internal inlet 225 than the non-curled hollow fiber membranes 2213. For example, the distance at which the non-curled hollow fiber membranes 2213 are spaced from the internal inlet 225 may be implemented to be greater than the distance at which the braided hollow fiber membranes 2211 are spaced from the internal inlet 225. The distance at which the non-curled hollow fiber membranes 2213 are spaced from the internal inlet 225 may refer to the shortest distance at which the non-curled hollow fiber membranes 2213 disposed closest to the internal inlet 225 among the non-curled hollow fiber membranes 2213 are spaced from the internal inlet 225 in a straight line. The distance by which the braided hollow fiber membrane 2211 is spaced from the internal inlet 225 may refer to the shortest distance by which the braided hollow fiber membrane 2211 disposed closest to the internal inlet 225 among the braided hollow fiber membranes 2211 is spaced from the internal inlet 225 in a straight line.

[0083] As described above, the humidifier 1 for a fuel cell according to the present disclosure can reduce shaking, vibration, etc. of the hollow fiber membrane bundle 221 due to the flow of the first gas introduced through the internal inlet 225 by implementing the braided hollow fiber membrane 2211 to be arranged closer to the internal inlet 225 than the non-curled hollow fiber membrane 2213. In addition, the humidifier 1 for a fuel cell according to the present disclosure can reduce the number of times the braided hollow fiber membrane 2211 contacts the inner shell 222 due to the flow of the first gas introduced through the internal inlet 225.

[0084] When the hollow fiber membrane bundle 221 includes a plurality of woven hollow fiber membranes 2211 and a plurality of non-curled hollow fiber membranes 2213, the woven hollow fiber membranes 2211 may be disposed in the first region 222a. The non-curled hollow fiber membranes 2213 may be disposed in the second region 222b. Therefore, the woven hollow fiber membranes 2211 may be disposed on the outside relative to the non-curled hollow fiber membranes 2213. The non-curled hollow fiber membranes 2213 may be disposed on the inside relative to the woven hollow fiber membranes 2211.

[0085] When the hollow fiber membrane bundle 221 includes a plurality of braided hollow fiber membranes 2211 and a plurality of non-curled hollow fiber membranes 2213, the braided hollow fiber membranes 2211 may be disposed closer to the internal outlet 226 than the non-curled hollow fiber membranes 2213. For example, the distance at which the non-curled hollow fiber membranes 2213 are spaced from the internal outlet 226 may be implemented to be greater than the distance at which the braided hollow fiber membranes 2211 are spaced from the internal outlet 226. The distance at which the non-curled hollow fiber membranes 2213 are spaced from the internal outlet 226 may refer to the shortest distance at which the non-curled hollow fiber membranes 2213 disposed closest to the internal outlet 226 among the non-curled hollow fiber membranes 2213 are spaced from the internal outlet 226 in a straight line. The distance by which the braided hollow fiber membrane 2211 is spaced from the internal outlet 226 may refer to the shortest distance by which the braided hollow fiber membrane 2211 disposed closest to the internal outlet 226 among the braided hollow fiber membranes 2211 is spaced from the internal outlet 226 in a straight line.

[0086] As described above, the humidifier 1 for a fuel cell according to the present disclosure can reduce shaking, vibration, etc. of the hollow fiber membrane bundle 221 due to the flow of the first gas discharged through the internal outlet 226 by implementing the braided hollow fiber membrane 2211 to be arranged closer to the internal outlet 226 than the non-curled hollow fiber membrane 2213. In addition, the humidifier 1 for a fuel cell according to the present disclosure can reduce the number of times the braided hollow fiber membrane 2211 contacts the inner shell 222 due to the flow of the first gas discharged through the internal outlet 226.

[0087] On the other hand, when the braided hollow fiber membrane 2211 is disposed in the first region 222a and the non-crimped hollow fiber membrane 2213 is disposed in the second region 222b, the braided hollow fiber membrane 2211 may be disposed closer to both the internal inlet 225 and the internal outlet 226 than the non-crimped hollow fiber membrane 2213 .

[0088] The hollow fiber membrane bundle 221 may include any one of the curled hollow fiber membrane 2212 and the non-curled hollow fiber membrane 2213 in addition to the braided hollow fiber membrane 2211. The hollow fiber membrane bundle 221 may include both the curled hollow fiber membrane 2212 and the non-curled hollow fiber membrane 2213 in addition to the braided hollow fiber membrane 2211. As described above, when the hollow fiber membrane bundle 221 includes at least one of the curled hollow fiber membrane 2212 and the non-curled hollow fiber membrane 2213 in addition to the braided hollow fiber membrane 2211, the braided hollow fiber membrane 2211 may be disposed closer to the internal inlet 225 than at least one of the curled hollow fiber membrane 2212 and the non-curled hollow fiber membrane 2213. The braided hollow fiber membrane 2211 may be disposed closer to the inner outlet 226 than at least one of the curled hollow fiber membrane 2212 and the non-curled hollow fiber membrane 2213 .

[0089] On the other hand, if the hollow fiber membrane bundle 221 includes both a curled hollow fiber membrane 2212 and a non-curled hollow fiber membrane 2213 in addition to the braided hollow fiber membrane 2211, the curled hollow fiber membrane 2212 can be disposed closer to the internal inlet 225 than the non-curled hollow fiber membrane 2213. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can increase the flow rate of the first gas flowing from the curled hollow fiber membrane 2212 to the non-curled hollow fiber membrane 2213 because the curled hollow fiber membrane 2212 having a higher porosity than the non-curled hollow fiber membrane 2213 is disposed closer to the internal inlet 225. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can improve the dispersion or diffusivity of the first gas using the curled hollow fiber membrane 2212, thereby improving the overall humidification performance. In addition, the humidifier 1 for a fuel cell according to the present disclosure can use the non-curled hollow fiber membrane 2213 to reduce the pressure difference between the opposite ends of the box 22. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce the risk of damage or destruction of the hollow fiber membrane bundle 221, and can improve the humidification performance by reducing the pressure difference.

[0090] Reference Figures 2 to 12 The hollow fiber membrane bundle 221 may include a plurality of three-dimensionally curled hollow fiber membranes 2214 ( Fig.11 and Fig.12 ). Fig.12 A braided hollow fiber membrane 2211 is schematically shown.

[0091] Each three-dimensional curled hollow fiber membrane 2214 is a curled hollow fiber membrane. Each three-dimensional curled hollow fiber membrane 2214 can be curled to extend in the first axis direction (X-axis direction) while surrounding the outside of the baseline 2214a. Therefore, each three-dimensional curled hollow fiber membrane 2214 can be implemented as a three-dimensional curled form. For example, each three-dimensional curled hollow fiber membrane 2214 can be formed to surround the outside of the baseline 2214a in a spiral form. The baseline 2214a can be implemented as a straight line parallel to the first axis direction (X-axis direction). On the other hand, each curled hollow fiber membrane 2212 can be implemented as a two-dimensional curled form. Each curled hollow fiber membrane 2212 can also be implemented as a three-dimensional curled form.

[0092] Each three-dimensional curled hollow fiber membrane 2214 can be unevenly spaced apart from the baseline 2214a while extending along the first axis direction (X axis direction). Each three-dimensional curled hollow fiber membrane 2214 can be evenly spaced apart from the baseline 2214a while extending along the first axis direction (X axis direction). The baseline 2214a can be arranged inside 2214b of each three-dimensional curled hollow fiber membrane 2214. One end of each three-dimensional curled hollow fiber membrane 2214 can be fixed by the first fixed layer 223, and the other end of each three-dimensional curled hollow fiber membrane 2214 can be fixed by the second fixed layer 224.

[0093] Although the effective area of ​​each three-dimensional curled hollow fiber membrane 2214 can be increased as each three-dimensional curled hollow fiber membrane 2214 extends in the first axis direction (X axis direction) while surrounding the outside of the baseline 2214a, the strength may be relatively reduced. Therefore, due to the flow of the first gas introduced into the inner shell 222 and discharged from the inner shell 222, the three-dimensional curled hollow fiber membrane 2214 may shake, vibrate, etc. When the three-dimensional curled hollow fiber membrane 2214 shakes excessively, vibrates, etc., the three-dimensional curled shape given to each three-dimensional curled hollow fiber membrane 2214 may be lost, the three-dimensional curled hollow fiber membranes 2214 may be entangled, and the three-dimensional curled hollow fiber membranes 2214 may be pushed to one side of the inner shell 222, thereby reducing the humidification performance.

[0094] To prevent this, each three-dimensionally curled hollow fiber membrane 2214 may be curled to extend in the first axis direction (X axis direction) while surrounding the outside of each woven hollow fiber membrane 2211. The woven hollow fiber membrane 2211 may be disposed in the interior 2214b of each three-dimensionally curled hollow fiber membrane 2214, thereby supporting each three-dimensionally curled hollow fiber membrane 2214 so that the movable distance of each three-dimensionally curled hollow fiber membrane 2214 is limited.

[0095] Therefore, the humidifier 1 for a fuel cell according to the present disclosure can improve the humidification performance by increasing the effective area by using a three-dimensionally curled hollow fiber membrane 2214, and can use a woven hollow fiber membrane 2211 to reduce the movable distance of each three-dimensionally curled hollow fiber membrane 2214 caused by the flow of the first gas introduced into the inner shell 222 and discharged from the inner shell 222.

[0096] Therefore, the humidifier 1 for fuel cells according to the present disclosure can use the three-dimensional curled hollow fiber membrane 2214 to maintain an increased effective area by preventing the loss of the three-dimensional curled shape given to each three-dimensional curled hollow fiber membrane 2214. In addition, the humidifier 1 for fuel cells according to the present disclosure can prevent the three-dimensional curled hollow fiber membrane 2214 from being damaged or destroyed by using the braided hollow fiber membrane 2211 to prevent entanglement between the three-dimensional curled hollow fiber membranes 2214. In addition, the humidifier 1 for fuel cells according to the present disclosure can be implemented so that the three-dimensional curled hollow fiber membrane 2214 has an overall uniform humidification performance because the braided hollow fiber membrane 2211 can be used to prevent the three-dimensional curled hollow fiber membrane 2214 from being pushed to one side of the inner shell 222.

[0097] On the other hand, since each woven hollow fiber membrane 2211 is also formed using a hollow fiber membrane, the humidifier 1 for a fuel cell according to the present disclosure can further increase the effective area using a woven hollow fiber membrane 2211, in addition to increasing the effective area, a three-dimensional curled hollow fiber membrane 2214 can also be used to further increase the effective area, thereby further improving the humidification performance. Each woven hollow fiber membrane 2211 can be formed by weaving a curled hollow fiber membrane 2212. Each woven hollow fiber membrane 2211 can be formed by weaving a three-dimensional curled hollow fiber membrane 2214. Each woven hollow fiber membrane 2211 can be formed by weaving a non-curled hollow fiber membrane 2213. Each woven hollow fiber membrane 2211 can be formed by weaving at least two of a non-curled hollow fiber membrane 2213, a curled hollow fiber membrane 2212, and a three-dimensional curled hollow fiber membrane 2214. The woven hollow fiber membranes 2211 can be spaced apart from each other. One end of each braided hollow fiber membrane 2211 may be fixed by the first fixing layer 223, and the other end of each braided hollow fiber membrane 2211 may be fixed by the second fixing layer 224. Since each braided hollow fiber membrane 2211 is disposed in the interior 2214b of the three-dimensionally curled hollow fiber membrane 2214, the three-dimensionally curled hollow fiber membrane 2214 may be formed to surround the exterior of each braided hollow fiber membrane 2211 in a spiral form. The braided hollow fiber membrane 2211 may be disposed parallel to the base line 2214a.

[0098] Reference Figures 2 to 15The hollow fiber membrane bundle 221 may include a plurality of combined hollow fiber membranes 2215 .

[0099] Each combined hollow fiber membrane 2215 may be implemented as being partially curled or partially curled into a different shape. In this regard, a detailed description will be given based on a single combined hollow fiber membrane 2215 .

[0100] The combined hollow fiber membrane 2215 may include a first curling portion 22151 and a connecting portion 22152 .

[0101] The first curling portion 22151 is a curled portion. The first curling portion 22151 may be a portion of the combined hollow fiber membrane 2215. The first curling portion 22151 may be curved by curling. For example, Fig.14 As shown, the first curling portion 22151 can be formed into a wave pattern. In this case, the first curling portion 22151 can be formed into a zigzag shape that passes through the baseline 2215a multiple times so as to include multiple crests and multiple troughs. That is, the first curling portion 22151 can be formed to have a wavelength 22151a and an amplitude 22151b. The baseline 2215a can be an imaginary line parallel to the first axis direction (X-axis direction). The wavelength 22151a can refer to the distance between one crest and another crest of the first curling portion 22151 in the longitudinal direction. The longitudinal direction of the first curling portion 22151 can be a direction parallel to the first axis direction (X-axis direction). The wavelength 22151a of the first curling portion 22151 can be formed to have a non-uniform length. The wavelength 22151a of the first curling portion 22151 can be formed to have a uniform length. The amplitude 22151b may refer to the distance between the crest of the first curl 22151 and the baseline 2215a. The amplitude 22151b may refer to the distance between the trough of the first curl 22151 and the baseline 2215a. The amplitude 22151b of the first curl 22151 may be formed to have a non-uniform length. The amplitude 22151b of the first curl 22151 may be formed to have a uniform length.

[0102] The connecting portion 22152 extends from the first curling portion 22151. The connecting portion 22152 may correspond to a portion of the combined hollow fiber membrane 2215. The connecting portion 22152 may be formed to have an amplitude smaller than that of the first curling portion 22151. Therefore, the combined hollow fiber membrane 2215 may be implemented as partially curled or partially curled into different shapes by the first curling portion 22151 and the connecting portion 22152. When the combined hollow fiber membrane 2215 is implemented as partially curled, the connecting portion 22152 may not be curled. In this case, the connecting portion 22152 may be formed to be straight. The hollow portion of the connecting portion 22152 and the baseline 2215a may be arranged on the same line. When the combined hollow fiber membrane 2215 is implemented to be partially curled into a different shape, the connection portion 22152 may be curled to have an amplitude smaller than the amplitude 22151 b of the first curled portion 22151 .

[0103] Therefore, the humidifier 1 for a fuel cell according to the present disclosure can achieve the following effects.

[0104] First, since the first curled portion 22151 is curled to have a larger amplitude 22151b than the connecting portion 22152, the first curled portion may have a higher porosity than the connecting portion 22152. Therefore, the humidifier 1 for a fuel cell according to the present disclosure may use the first curled portion 22151 to increase the flow rate of the first gas passing through the combined hollow fiber membranes 2215. Therefore, the humidifier 1 for a fuel cell according to the present disclosure may improve the dispersion or diffusivity of the first gas introduced into the inner shell 222, thereby improving the overall humidification performance.

[0105] Secondly, the humidifier 1 for a fuel cell according to the present disclosure can use the first curled portion 22151 of each combined hollow fiber membrane 2215 to increase the effective area of ​​the combined hollow fiber membrane 2215. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can improve the humidification performance by increasing the effective area of ​​the combined hollow fiber membrane 2215.

[0106] Again, when all the combined hollow fiber membranes 2215 are implemented to have the first curled portion 22151, the pressure difference between the opposite ends of the box 22 increases, whereby the risk of damage or destruction of the combined hollow fiber membranes 2215 is high, and the humidification performance may be reduced. In contrast, in the humidifier 1 for a fuel cell according to the present disclosure, the combined hollow fiber membrane 2215 is implemented to have a combination of the first curled portion 22151 and the connecting portion 22152, whereby the connecting portion 22152 can be used to reduce the pressure difference between the opposite ends of the box 22. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce the risk of damage or destruction of the combined hollow fiber membranes 2215, and can improve the humidification performance by reducing the pressure difference.

[0107] The first curled portion 22151 may be disposed at a position corresponding to any one of the inner inlet 225 and the inner outlet 226 .

[0108] When the first curled portion 22151 is disposed at a position corresponding to the internal inlet 225, the first gas can flow toward the first curled portion 22151 after being introduced into the inner shell 222 through the internal inlet 225. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can increase the flow rate of the first gas introduced into the inner shell 222 through the internal inlet 225 through the first curled portion 22151 of the combined hollow fiber membrane 2215. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can increase the proportion of the portion of the hollow fiber membrane bundle 221 located on the relatively inner side of the inner shell 222 related to humidification. That is, the membrane contact area of ​​the first gas can be increased. Therefore, the overall humidification performance of the humidifier 1 for a fuel cell according to the present disclosure can be improved.

[0109] The first curled portion 22151 may be disposed at a position facing the internal inlet 225. The first curled portion 22151 may be disposed to overlap the internal inlet 225 in the first axial direction (X-axis direction). In this case, the connection portion 22152 may be disposed at a position spaced apart from the internal inlet 225 in the first axial direction (X-axis direction). Therefore, the humidifier 1 for a fuel cell according to the present disclosure may use the connection portion 22152 to reduce the pressure difference between the opposite ends of the box 22 during the flow of the first gas toward the internal outlet 226. The first curled portion 22151 may be disposed in the first axial direction (X-axis direction) at the inflow area 222c ( Fig.13 22). The inflow region 222c is an inner region of the inner shell 222, in which the first gas is introduced into the inner shell 222 through the inner inlet 225. In the first axis direction (X axis direction), the inflow region 222c may include a predetermined distance from the inner inlet 225 to opposite sides. On the other hand, one end of the first curled portion 22151 may be fixed by the first fixing layer 223. In this case, the other end of the first curled portion 22151 may be connected to the connecting portion 22152. The first curled portion 22151 and the connecting portion 22152 may be integrally formed.

[0110] When the first curled portion 22151 is disposed at a position corresponding to the inner outlet 226, the first gas can flow from the inside of the inner housing 222 toward the first curled portion 22151, thereby being discharged through the inner outlet 226. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can be implemented to make it difficult for the first gas to flow toward the inner outlet 226 using the first curled portion 22151, thereby increasing the residence time of the first gas in the inner housing 222. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can improve the overall humidification performance by increasing the residence time.

[0111] The first curled portion 22151 may be disposed at a position facing the internal outlet 226. The first curled portion 22151 may be disposed to overlap the internal outlet 226 in the first axial direction (X-axis direction). In this case, the connection portion 22152 may be disposed at a position spaced apart from the internal outlet 226 in the first axial direction (X-axis direction). Therefore, the humidifier 1 for a fuel cell according to the present disclosure may use the connection portion 22152 to reduce the pressure difference between the opposite ends of the box 22 during the flow of the first gas toward the internal outlet 226. The first curled portion 22151 may be disposed in the outflow area 222d ( Fig.13 22). The outflow area 222d is an inner area of ​​the inner shell 222, in which the first gas is discharged from the inside of the inner shell 222 through the inner outlet 226. In the first axis direction (X axis direction), the outflow area 222d may include a predetermined distance from the inner outlet 226 to opposite sides. On the other hand, one end of the first curled portion 22151 may be fixed by the second fixing layer 224. In this case, the other end of the first curled portion 22151 may be connected to the connecting portion 22152. The first curled portion 22151 and the connecting portion 22152 may be integrally formed.

[0112] Reference Figures 2 to 15 Each combined hollow fiber membrane 2215 may include a second curling portion 22153 ( Fig.15 ).

[0113] The second curling portion 22153 is a curled portion. The second curling portion 22153 may correspond to a portion of the combined hollow fiber membrane 2215. The second curling portion 22153 may be formed to be curved by curling. For example, Fig.15As shown, the second curling portion 22153 can be formed into a wave pattern. In this case, the second curling portion 22153 can be formed into a zigzag shape that passes through the baseline 2215a multiple times to include multiple crests and multiple troughs. That is, the second curling portion 22153 can be formed to have a wavelength 22153a and an amplitude 22153b. The wavelength 22153a can refer to the distance between one crest and another crest of the second curling portion 22153 in the longitudinal direction. The wavelength 22153a of the second curling portion 22153 can be formed to have a non-uniform length. The wavelength 22153a of the second curling portion 22153 can be formed to have a uniform length. The amplitude 22153b can refer to the distance between the crest of the second curling portion 22153 and the baseline 2215a. The amplitude 22153b can refer to the distance between the trough of the second curling portion 22153 and the baseline 2215a. The amplitude 22153b of the second curled portion 22153 may be formed to have a non-uniform length. The amplitude 22153b of the second curled portion 22153 may be formed to have a uniform length.

[0114] When the second curling portion 22153 is provided, the connection portion 22152 may be provided between the second curling portion 22153 and the first curling portion 22151 in the first axis direction (X axis direction). The second curling portion 22153 may be fixed by the second fixing layer 224. The first curling portion 22151 may be fixed by the first fixing layer 223.

[0115] When the second curled portion 22153 is provided, the second curled portion 22153 may be provided at a position corresponding to the internal outlet 226. The first curled portion 22151 may be provided at a position corresponding to the internal inlet 225. The connecting portion 22152 may be provided between the internal inlet 225 and the internal outlet 226 in the first axial direction (X-axis direction). Therefore, the humidifier 1 for a fuel cell according to the present disclosure may use the first curled portion 22151 to increase the dispersion or diffusivity of the first gas introduced into the inner shell 222, may use the second curled portion 22153 to increase the residence time of the first gas in the inner shell 222, and may use the connecting portion 22152 to reduce the pressure difference between the opposite ends of the cartridge 22. Therefore, in the humidifier 1 for a fuel cell according to the present disclosure, not only the humidification performance may be improved, but also the service life may be extended by reducing the risk of damage or destruction of the combined hollow fiber membrane 2215. In this case, the first curling portion 22151 may be disposed in the inflow region 222c, and the second curling portion 22153 may be disposed in the outflow region 222d. The connecting portion 22152 may be disposed in the connecting region 222e ( Fig.13The connection region 222e is an inner region of the inner shell 222, and the inner region of the inner shell 222 is disposed between the inflow region 222c and the outflow region 222d in the first axis direction (X axis direction).

[0116] Reference Figures 2 to 15 , the second curled portion 22153 may be formed to have a shorter wavelength than the first curled portion 22151. That is, the wavelength 22151a of the first curled portion 22151 may be implemented to be greater than the wavelength 22153a of the second curled portion 22153. Therefore, the humidifier 1 for a fuel cell according to the present disclosure may be implemented to further improve the diffusibility or dispersion of the first gas using the first curled portion 22151, and to further increase the residence time of the first gas using the second curled portion 22153.

[0117] like Fig.14 and Fig.15 As shown, the first curling portion 22151 may be curled to have a wavelength 22151a of 10mm to 20mm. If the wavelength 22151a is implemented to be less than 10mm, the first curling portion 22151 may cause an excessive increase in the pressure difference between the opposite ends of the box 22. If the wavelength 22151a is implemented to be greater than 20mm, the first curling portion 22151 may not be able to achieve outstanding differences in the dispersion or diffusivity of the first gas and the effective area compared to the case where the first curling portion is not curled. In view of this, the humidifier 1 for a fuel cell according to the present disclosure is provided with a first curling portion 22151 curled to have a wavelength 22151a of 10mm to 20mm, thereby reducing the risk of damage or destruction of the combined hollow fiber membrane 2215 due to the pressure difference between the opposite ends of the box 22, and the humidification performance can be improved by improving the dispersion or diffusivity of the first gas and the effective area.

[0118] like Fig.14 and Fig.15 As shown, the first curled portion 22151 may be curled to have an amplitude 22151b of 0.1 mm or more. If the amplitude 22151b is implemented to be less than 0.1 mm, the first curled portion 22151 may not achieve a prominent difference in the dispersion or diffusivity of the first gas and the effective area compared to the case where the first curled portion is not curled. In view of this, the humidifier 1 for a fuel cell according to the present disclosure is provided with a first curled portion 22151 curled to have an amplitude 22151b of 0.1 mm or more, thereby improving the humidification performance by improving the dispersion or diffusivity of the first gas and the effective area.

[0119] The first curled portion 22151 may be curled to have an amplitude 22151b of 5 mm or less. If the amplitude 22151b is implemented to be greater than 5 mm, the first curled portion 22151 may cause an excessive increase in the pressure difference between the opposite ends of the box 22. In view of this, the humidifier 1 for a fuel cell according to the present disclosure is provided with a first curled portion 22151 curled to have an amplitude 22151b of 5 mm or less, thereby reducing the risk of damage or destruction of the combined hollow fiber membrane 2215 due to the pressure difference between the opposite ends of the box 22, and the humidification performance can be improved by reducing the pressure difference.

[0120] like Fig.15 As shown, the second curled portion 22153 can be curled to have a wavelength 22153a of 5mm to 15mm. If the wavelength 22153a is implemented to be less than 5mm, the second curled portion 22153 may cause an excessive increase in the pressure difference between the opposite ends of the box 22. If the wavelength 22153a is implemented to be greater than 15mm, the second curled portion 22153 may not be able to achieve a prominent difference in increasing the residence time of the first gas compared to the case where the second curled portion is not curled. In view of this, the humidifier 1 for a fuel cell according to the present disclosure is provided with a second curled portion 22153 curled to have a wavelength 22153a of 5mm to 15mm, thereby reducing the risk of damage or destruction of the combined hollow fiber membrane 2215 due to the pressure difference between the opposite ends of the box 22, and the humidification performance can be improved by increasing the residence time of the first gas.

[0121] like Fig.15 As shown, the second curled portion 22153 may be curled to have an amplitude 22153b of 0.1 mm or more. If the amplitude 22153b is implemented to be less than 0.1 mm, the second curled portion 22153 may not achieve a prominent difference in increasing the residence time of the first gas compared to the case where the second curled portion is not curled. In view of this, the humidifier 1 for a fuel cell according to the present disclosure is provided with a second curled portion 22153 curled to have an amplitude 22153b of 0.1 mm or more, thereby improving the humidification performance by increasing the residence time of the first gas.

[0122] The second curled portion 22153 may be curled to have an amplitude 22153b of less than 3 mm. If the amplitude 22153b is implemented to be greater than 3 mm, the second curled portion 22153 may cause an excessive increase in the pressure difference between the opposite ends of the box 22. In view of this, the humidifier 1 for a fuel cell according to the present disclosure is provided with a second curled portion 22153 curled to have an amplitude 22153b of less than 3 mm, thereby reducing the risk of damage or destruction of the combined hollow fiber membrane 2215 due to the pressure difference between the opposite ends of the box 22, and the humidification performance can be improved by reducing the pressure difference.

[0123] When the hollow fiber membrane bundle 221 includes the braided hollow fiber membrane 2211 and the combined hollow fiber membrane 2215, the braided hollow fiber membrane 2211 may be disposed closer to the internal inlet 225 than the combined hollow fiber membrane 2215. For example, the distance between the combined hollow fiber membrane 2215 and the internal inlet 225 may be implemented to be greater than the distance between the braided hollow fiber membrane 2211 and the internal inlet 225. The distance between the combined hollow fiber membrane 2215 and the internal inlet 225 may refer to the shortest distance between the combined hollow fiber membrane 2215 disposed closest to the internal inlet 225 and the internal inlet 225 in a straight line. The distance between the braided hollow fiber membrane 2211 and the internal inlet 225 may refer to the shortest distance between the braided hollow fiber membrane 2211 disposed closest to the internal inlet 225 and the internal inlet 225 in a straight line.

[0124] As described above, since the braided hollow fiber membrane 2211 is implemented to be arranged closer to the internal inlet 225 than the combined hollow fiber membrane 2215, in the humidifier 1 for a fuel cell according to the present disclosure, the braided hollow fiber membrane 2211 having higher durability and strength than the combined hollow fiber membrane 2215 can be arranged closer to the internal inlet 225. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce the shaking, vibration, etc. of the hollow fiber membrane bundle 221 caused by the flow of the first gas introduced through the internal inlet 225. Therefore, the humidifier 1 for a fuel cell according to the present disclosure can reduce the fatigue accumulated in the hollow fiber membrane bundle 221 due to the flow of the first gas introduced through the internal inlet 225, thereby reducing the possibility of damage or destruction (e.g., cutting) of the hollow fiber membrane bundle 221. In addition, the humidifier 1 for a fuel cell according to the present disclosure can reduce the number of times the woven hollow fiber membrane 2211 contacts the inner shell 222 due to the flow of the first gas introduced through the internal inlet 225, and even if the woven hollow fiber membrane contacts the inner shell 222, damage to the woven hollow fiber membrane 2211 can be reduced.

[0125] In this case, the braided hollow fiber membrane 2211 may be disposed in the first region 222a ( Figure 7 ), the combined hollow fiber membrane 2215 may be disposed in the second region 222b ( Figure 7 ). Therefore, the braided hollow fiber membrane 2211 can be arranged on the outside relative to the combined hollow fiber membrane 2215. The combined hollow fiber membrane 2215 can be arranged on the inside relative to the braided hollow fiber membrane 2211. When the braided hollow fiber membrane 2211 is arranged in the first area 222a and the combined hollow fiber membrane 2215 is arranged in the second area 222b, the braided hollow fiber membrane 2211 can be arranged closer to both the internal inlet 225 and the internal outlet 226 than the combined hollow fiber membrane 2215.

[0126] On the other hand, when each combined hollow fiber membrane 2215 includes the first curled portion 22151 and the second curled portion 22153, the braided hollow fiber membrane 2211 may be disposed closer to the inner inlet 225 than the first curled portion 22151. The braided hollow fiber membrane 2211 may be disposed closer to the inner outlet 226 than the second curled portion 22153.

[0127] The present disclosure described above is not limited to the above embodiments and drawings, and it will be obvious to those skilled in the art that various substitutions, modifications and changes may be made without departing from the technical concept of the present disclosure.

Claims

1. A cartridge, the cartridge being provided in a humidifier for a fuel cell, the humidifier being configured to humidify dry gas to be supplied to a fuel cell stack using humidified gas, the cartridge comprising: an inner housing having openings formed at opposite ends; an internal inlet formed on the inner shell, the internal inlet being configured to introduce a first gas into the inner shell; an internal outlet, the internal outlet being spaced apart from the internal inlet in a first axial direction, the internal outlet being configured to discharge the first gas from the inner shell; as well as a hollow fiber membrane bundle, the hollow fiber membrane bundle being accommodated in the inner housing, The hollow fiber membrane bundle includes a plurality of braided hollow fiber membranes, and each of the braided hollow fiber membranes is formed by braiding at least two hollow fiber membranes.

2. The box according to claim 1, wherein The hollow fiber membrane bundle includes a plurality of curled hollow fiber membranes, each of the curled hollow fiber membranes is curled, and The braided hollow fiber membranes are disposed closer to the interior inlet than the curled hollow fiber membranes.

3. The box according to claim 2, wherein Each of the curled hollow fiber membranes is curled to have a wavelength of 10 mm to 20 mm and an amplitude of 0.1 mm or more.

4. The cartridge according to claim 1, wherein The hollow fiber membrane bundle includes a plurality of non-crimped hollow fiber membranes, each of the non-crimped hollow fiber membranes is not curled, and The braided hollow fiber membranes are positioned closer to the interior inlet than the non-crimped hollow fiber membranes.

5. The cartridge according to claim 1, wherein The hollow fiber membrane bundle includes at least one of a plurality of curled hollow fiber membranes and a plurality of non-curled hollow fiber membranes, each of the curled hollow fiber membranes is curled, and each of the non-curled hollow fiber membranes is not curled, and The braided hollow fiber membrane is disposed closer to the interior outlet than at least one of the crimped hollow fiber membrane and the non-crimped hollow fiber membrane.

6. The cartridge according to claim 1, wherein The hollow fiber membrane bundle comprises a plurality of three-dimensionally curled hollow fiber membranes, and Each of the three-dimensionally curled hollow fiber membranes is curled to extend in the first axis direction while surrounding the outside of the braided hollow fiber membranes.

7. The box according to claim 6, wherein Each of the three-dimensionally curled hollow fiber membranes is formed to surround the outer side of the braided hollow fiber membrane in a spiral form.

8. The cartridge according to claim 1, wherein The hollow fiber membrane bundle comprises a plurality of combined hollow fiber membranes. Each of the combined hollow fiber membranes includes a first curled portion that is curled and a connecting portion extending from the first curled portion, the connecting portion having a smaller amplitude than the first curled portion, and The braided hollow fiber membranes are disposed closer to the interior inlet than the combined hollow fiber membranes.

9. The cartridge according to claim 8, wherein Each of the combined hollow fiber membranes includes a second curled portion that is curled, The first curled portion is arranged at a position corresponding to the internal entrance, The second curled portion is disposed at a position corresponding to the internal outlet, and The connecting portion is disposed between the first curled portion and the second curled portion in the first axial direction.

10. The cartridge according to claim 9, wherein Each of the first curled portions is formed to have a longer wavelength than each of the second curled portions.

11. A humidifier for a fuel cell, the humidifier for a fuel cell comprising: a humidification module configured to humidify dry gas to be supplied to the fuel cell stack using the humidified gas; a first cover, the first cover being coupled to one end of the humidification module; as well as a second cover, the second cover being combined with the other end of the humidification module, Wherein, the humidification module comprises: an intermediate housing having opposite ends that are open; and at least one cartridge housed in the intermediate housing, and The box includes: an inner housing having openings formed at opposite ends; an internal inlet formed on the inner shell, the internal inlet being configured to introduce a first gas into the inner shell; an internal outlet spaced apart from the internal inlet in a first axial direction, the internal outlet being configured to discharge the first gas from the inner casing; and a hollow fiber membrane bundle, the hollow fiber membrane bundle being accommodated in the inner housing, and The hollow fiber membrane bundle includes a plurality of braided hollow fiber membranes, each of which is formed by braiding at least two hollow fiber membranes.

12. The humidifier for a fuel cell according to claim 11, wherein: The hollow fiber membrane bundle includes a plurality of curled hollow fiber membranes, each of the curled hollow fiber membranes is curled, and The braided hollow fiber membranes are disposed closer to the interior inlet than the curled hollow fiber membranes.

13. The humidifier for a fuel cell according to claim 12, wherein: Each of the curled hollow fiber membranes is curled to have a wavelength of 10 mm to 20 mm and an amplitude of 0.1 mm or more.

14. The humidifier for a fuel cell according to claim 11, wherein: The hollow fiber membrane bundle includes a plurality of non-crimped hollow fiber membranes, each of the non-crimped hollow fiber membranes is not curled, and The braided hollow fiber membranes are positioned closer to the interior inlet than the non-crimped hollow fiber membranes.

15. The humidifier for a fuel cell according to claim 11, wherein: The hollow fiber membrane bundle includes at least one of a plurality of curled hollow fiber membranes and a plurality of non-curled hollow fiber membranes, each of the curled hollow fiber membranes is curled, and each of the non-curled hollow fiber membranes is not curled, and The braided hollow fiber membrane is disposed closer to the interior outlet than at least one of the crimped hollow fiber membrane and the non-crimped hollow fiber membrane.

16. The cartridge for a humidifier for a fuel cell according to claim 11, wherein: The hollow fiber membrane bundle comprises a plurality of three-dimensionally curled hollow fiber membranes, and Each of the three-dimensionally curled hollow fiber membranes is curled to extend in the first axis direction while surrounding the outside of the braided hollow fiber membranes.

17. The cartridge for a humidifier for a fuel cell according to claim 16, wherein: Each of the three-dimensionally curled hollow fiber membranes is formed to surround the outer side of the braided hollow fiber membrane in a spiral form.

18. The cartridge for a humidifier for a fuel cell according to claim 11, wherein: The hollow fiber membrane bundle comprises a plurality of combined hollow fiber membranes. Each of the combined hollow fiber membranes includes a curled first curled portion and a connecting portion extending from the first curled portion, the connecting portion having a smaller amplitude than the first curled portion, and The braided hollow fiber membranes are disposed closer to the interior inlet than the combined hollow fiber membranes.

19. The cartridge for a humidifier for a fuel cell according to claim 18, wherein: Each of the combined hollow fiber membranes includes a second curled portion that is curled, The first curled portion is arranged at a position corresponding to the internal entrance, The second curled portion is disposed at a position corresponding to the internal outlet, and The connecting portion is disposed between the first curled portion and the second curled portion in the first axial direction.

20. The cartridge for a humidifier for a fuel cell according to claim 19, wherein: Each of the first curled portions is formed to have a longer wavelength than each of the second curled portions.

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