Membrane humidifier for fuel cell comprising hollow fiber membrane twist core

Abstract

The present invention relates to a technique capable of actively controlling the humidification amount or humidification efficiency of a membrane humidifier for a fuel cell by including a core body capable of controlling the torsion of a hollow fiber membrane. The technique includes: an intermediate housing having a humid air inlet and a humid air outlet, and having a core disposed therein; a first cover portion coupled to one side of the intermediate housing and having a dry air inlet; and a second cover portion coupled to the other side of the intermediate case and having a dry air outlet, in which the core includes: a first inner case; a second inner housing connected to the first inner housing; and a hollow fiber membrane disposed inside the first inner housing and the second inner housing, and having one side fixed to the first inner housing and the other side fixed to the second inner housing, and the first inner housing being rotatable with respect to the second inner housing.

Description

Technical Field

[0001] This disclosure relates to a membrane humidifier for a fuel cell. More specifically, this disclosure relates to a membrane humidifier for a fuel cell that actively controls the humidification amount by controlling the torsion of a hollow fiber membrane or a bundle of hollow fiber membranes. Background Technology

[0002] A fuel cell is a type of battery that generates electricity by combining hydrogen and oxygen. The advantage of this type of fuel cell is that, unlike ordinary chemical batteries such as dry cell batteries or rechargeable batteries, it can continuously generate electricity as long as hydrogen and oxygen are supplied, and there is no heat loss. Therefore, the efficiency of a fuel cell is approximately twice that of an internal combustion engine.

[0003] Furthermore, fuel cells directly convert the chemical energy generated by the combination of hydrogen and oxygen into electrical energy, thus emitting only small amounts of pollutants. Therefore, the advantages of fuel cells lie in their environmental friendliness and in reducing concerns about resource depletion due to increased energy consumption.

[0004] Fuel cells can be classified based on the type of electrolyte used. Among fuel cells, polymer electrolyte membrane fuel cells (PEMFCs) are considered most advantageous for transportation systems and small-scale stationary power generation equipment because PEMFCs operate at lower temperatures than other fuel cells and have a high output density, which allows for miniaturization.

[0005] One of the most important factors in improving PEMFC performance is supplying a certain amount or more of moisture to the polymer electrolyte membrane or proton exchange membrane (PEM) of the membrane electrode assembly (MEA) to maintain its moisture content. This is because power generation efficiency drops abruptly when the PEM dries out.

[0006] As mentioned above, the role of a humidifier in humidifying PEM is likely necessary and very important. Among these methods, the humidification membrane method, which selectively humidifies PEM by using a membrane that only transmits water vapor, is advantageous because it allows for a reduction in the weight and size of the humidifier.

[0007] In particular, the selectively permeable membrane used in the humidification membrane method is preferably a hollow fiber membrane with a large permeation area per unit volume when forming a module. That is, when manufacturing a membrane humidifier using a hollow fiber membrane, a high degree of integration of hollow fiber membranes with a large contact surface area is possible, so that fuel cells can be adequately humidified even in small quantities.

[0008] However, excessive humidification also presents problems. For example, when excessive moisture supply causes condensation and blockage of flow paths within the battery stack during low-power operation periods, it can lead to partial degradation of the battery stack.

[0009] Therefore, actively controlling the humidification amount according to the operating status of the fuel cell is likely to be a very important task in the field of membrane humidifiers for fuel cells. Summary of the Invention

[0010] Technical issues

[0011] This disclosure solves the above-mentioned problems and provides a membrane humidifier for fuel cells, the membrane humidifier including a hollow fiber membrane torsion core and capable of actively controlling the humidification amount according to the operating state of the fuel cell.

[0012] Technical solution

[0013] According to an embodiment of the present disclosure, a membrane humidifier for a fuel cell (the membrane humidifier includes a hollow fiber membrane torsion core) for solving the above-mentioned problems includes: an intermediate shell including a humid air inlet, a humid air outlet, and a core disposed inside; a first cover connected to one side of the intermediate shell and including a dry air inlet; and a second cover connected to the other side of the intermediate shell and including a dry air outlet. The core includes a first inner shell, a second inner shell connected to the first inner shell, and a hollow fiber membrane disposed inside the first and second inner shells, and having one side fixed to the first inner shell and the other side fixed to the second inner shell, and the first inner shell being rotatable relative to the second inner shell.

[0014] In embodiments of this disclosure, the second inner shell may be fixed, and the torsion of the hollow fiber membrane may be controlled by the rotation of the first inner shell.

[0015] In embodiments of this disclosure, the first inner housing can be rotated by humid air supplied to the interior of the intermediate housing via a humid air inlet.

[0016] In embodiments of this disclosure, the degree of rotation of the first inner shell can be controlled according to the inflow intensity of humid air.

[0017] In embodiments of this disclosure, the first inner housing may be positioned such that its outer peripheral surface faces the humid air inlet, and the second inner housing may be positioned such that its outer peripheral surface faces the humid air outlet.

[0018] In embodiments of this disclosure, the first inner housing may further include rotating blades on its outer peripheral surface.

[0019] In embodiments of this disclosure, the rotating blades can be connected to the intermediate housing via an elastic member.

[0020] In embodiments of this disclosure, the hollow fiber membrane can be configured such that the torsion decreases as the inflow intensity of humid air increases, and the torsion increases as the inflow intensity of humid air decreases.

[0021] In embodiments of this disclosure, a first window for introducing humid air may be provided on the outer peripheral surface of the first inner shell, and a second window for discharging humid air may be provided on the outer peripheral surface of the second inner shell.

[0022] In embodiments of this disclosure, the opening area of ​​the first window may be larger than the opening area of ​​the second window.

[0023] Beneficial effects

[0024] Based on the above configuration and connection relationship, this disclosure has the following advantages: actively controlling the humidification amount of the membrane humidifier used for the fuel cell, so that the humidification efficiency increases during the high-power period of the fuel cell and decreases during the low-power period of the fuel cell. Attached Figure Description

[0025] Figure 1 This is a perspective view showing a membrane humidifier for a fuel cell according to an embodiment of the present disclosure.

[0026] Figure 2 This is a perspective view showing the core of a membrane humidifier for a fuel cell according to an embodiment of the present disclosure.

[0027] Figure 3 This is a view showing the torsional changes of a hollow fiber membrane in a membrane humidifier for a fuel cell according to an embodiment of the present disclosure, based on the output of the fuel cell.

[0028] Figure 4 It is along Figure 1 The cross-sectional view taken by line I-I' in the figure is used to show a comparison diagram of controlling the humidification amount according to the operating state of the fuel cell in a membrane humidifier for a fuel cell according to an embodiment of the present disclosure. Detailed Implementation

[0029] The present disclosure will now be described more fully with reference to the accompanying drawings, in which embodiments according to the present disclosure are illustrated and the principles of the present disclosure are described so that those skilled in the art can practice the embodiments. The disclosed embodiments can be implemented in various forms.

[0030] Expressions such as “comprising” or “may include”, which may be used in various embodiments of this disclosure, indicate the presence of the corresponding disclosed functions, operations, components, etc., and do not limit one or more additional functions, operations, components, etc. Furthermore, in various embodiments according to this disclosure, terms such as “comprising” or “having” are intended to indicate the presence of features, numbers, steps, operations, components, portions, or combinations thereof described in the specification; however, it should be understood that these terms do not exclude the presence or addition of one or more other features, numbers, steps, operations, components, portions, or combinations thereof.

[0031] When a component is "connected or coupled" to another component, it should be understood that the component can be directly connected or coupled to the other component, but there may also be new other components between the component and the other component. Furthermore, when a component is "directly connected" or "directly coupled" to another component, it should be understood that there are no new components between the component and the other component.

[0032] The terms "first," "second," etc., used in this document may be used to describe various components, but components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from others.

[0033] Unless the context clearly indicates otherwise, the singular form used herein is intended to include the plural form as well. For example, the hollow fiber membrane used herein can be interpreted as including a plurality of hollow fiber membranes forming a bundle of hollow fiber membranes, unless explicitly stated as singular.

[0034] In the following, embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0035] Figure 1 This is a perspective view showing a membrane humidifier for a fuel cell according to an embodiment of the present disclosure. Figure 2 This is a perspective view showing the core of a membrane humidifier for a fuel cell according to an embodiment of the present disclosure. Figure 3 This is a view showing the torsional changes of a hollow fiber membrane in a membrane humidifier for a fuel cell according to an embodiment of the present disclosure, based on the output of the fuel cell. Figure 4 It is along Figure 1 The cross-sectional view taken by line I-I' in the figure is used to show a comparison diagram of the humidification amount controlled according to the operating state of the fuel cell in the membrane humidifier 10 for a fuel cell according to an embodiment of the present disclosure.

[0036] refer to Figure 1In embodiments of this disclosure, the membrane humidifier 10 for a fuel cell includes a hollow fiber membrane twisted core, and also includes an intermediate housing 100, a first cover 200 and a second cover 200' located on both sides of the intermediate housing 100 to form the exterior of the membrane humidifier, and a core 300 including a hollow fiber membrane 400 inside the intermediate housing 100.

[0037] A dry air inlet 210 for introducing dry air is provided in the first cover 200, and a dry air outlet 220 is provided in the second cover 200'. The dry air introduced through the dry air inlet 210 is humidified and discharged to the fuel cell stack (not shown) through the dry air outlet 220.

[0038] A humid air inlet 110 and a humid air outlet 120 are provided on the outer peripheral surface of the intermediate housing 100. Humid air discharged from the fuel cell stack is introduced into the intermediate housing 100 through the humid air inlet 110, and the humid air that has been humidified inside the intermediate housing 100 is discharged to the outside through the humid air outlet 120.

[0039] Humidification is performed between the humid air introduced into the intermediate housing 100 and the dry air introduced from the outside and introduced into the hollow fiber membrane 400, such that the humid air provides moisture only to the dry air through the hollow fiber membrane 400. The basic operation of the membrane humidifier 10 for a fuel cell is largely similar to that of a conventional membrane humidifier.

[0040] Reference Figure 1 and Figure 2 In the membrane humidifier 10 for a fuel cell according to an embodiment of the present disclosure, the core 300 included in the intermediate housing 100 is configured such that a first inner housing 310 and a second inner housing 320 are connected to form the exterior of the core 300, and the first inner housing 310 is configured to be rotatable relative to the second inner housing 320.

[0041] Furthermore, one side of the hollow fiber membrane 400 located inside the core 300 is fixed to the first inner shell 310, and the other side is fixed to the second inner shell 320. In this case, the hollow fiber membrane 400 is twisted or the previously formed twist is released by the rotation of the first inner shell 310. Therefore, the twist of the hollow fiber membrane 400 is controlled by the rotation of the first inner shell 310, and ultimately controls the humidification amount or humidification efficiency.

[0042] Specifically, refer to Figure 3(As stated above, the hollow fiber membrane 400 herein is interpreted as including a plurality of hollow fiber membranes 400 forming a bundle of hollow fiber membranes 400, unless explicitly stated as a singular number), when the torsion of the bundle of hollow fiber membranes 400 increases, the gap between adjacent hollow fiber membranes 400 decreases, and therefore, the effective surface area of ​​the hollow fiber membrane 400 humidified with humid air decreases.

[0043] On the other hand, when the torsion of the bundle of hollow fiber membranes 400 is released due to the rotation of the first inner housing 310, the gap between adjacent hollow fiber membranes 400 increases, providing a flow path for humid air, and the effective surface area of ​​the hollow fiber membranes 400 performing humidification increases.

[0044] Therefore, the torsion of the hollow fiber membrane 400 is controlled by the rotation of the first inner shell 310, and the torsion of the hollow fiber membrane 400 is controlled, and thus the humidification amount or humidification efficiency of the membrane humidifier is controlled.

[0045] Next, we will refer to Figures 1 to 4 The present disclosure describes in detail each configuration of a membrane humidifier 10 for a fuel cell, including a hollow fiber membrane 400 and a torsion core 300, according to embodiments of the present disclosure.

[0046] refer to Figure 1 The intermediate shell 100 forms the exterior of the membrane humidifier. For example... Figure 1 As shown, the intermediate shell 100 can be set as a cylinder, but is not limited to this, and can be set as a square prism with an empty interior, a polyhedron with an empty interior, etc.

[0047] A humid air inlet 110 may be provided on one side of the intermediate housing 100, allowing humid air to be introduced into the intermediate housing 100 from the fuel cell stack (not shown). The humid air inlet 110 may be provided on the outer peripheral surface of the intermediate housing 100 in the form of a pipe penetrating the intermediate housing 100.

[0048] The humid air outlet 120 can be located on the other side of the intermediate housing 100, so that the introduced humid air can humidify the hollow fiber membrane 400 and be discharged to the outside of the intermediate housing 100. The humid air outlet 120 can be provided on the outer peripheral surface of the intermediate housing 100 in the form of a tube penetrating the intermediate housing 100, and can be located at a position spaced apart from the humid air inlet 110.

[0049] The first cover 200 can be connected to one end of the intermediate housing 100. The first cover 200 is a space separated from the interior of the intermediate housing 100 and through which dry air flows, and may include a dry air inlet 210 to allow dry air to be introduced from the outside. The dry air inlet 210 may be provided in the form of a tube penetrating the first cover 200.

[0050] The second cover 200' can be connected to the other end of the intermediate housing 100. Similar to the first cover 200, the second cover 200' is a space separated from the interior of the intermediate housing 100 and through which dry air flows, and may include a dry air outlet 220 to allow dry air introduced through the first cover 200 to pass through the hollow fiber membrane 400 and be discharged to the fuel cell stack. The dry air outlet 220 may be provided in the form of a tube penetrating the second cover 200'.

[0051] The core 300 can be disposed inside the intermediate housing 100. The core 300 is a container or frame in which the hollow fiber membrane 400 is embedded, and is inserted into and mounted on the intermediate housing 100 in units of the core 300, or is configured to perform the function of being separated from the intermediate housing 100 in units of the core 300.

[0052] refer to Figure 1 and Figure 2 In embodiments of this disclosure, the core 300 may include a first inner shell 310 and a second inner shell 320, the first inner shell 310 and the second inner shell 320 being connected to form the exterior of the core 300.

[0053] The first inner housing 310 and the second inner housing 320 may each be configured as a cylindrical shape with open sides. However, this disclosure is not limited thereto.

[0054] One side of the first inner housing 310 and one side of the second inner housing 320 may be connected to each other; for the connection, an encapsulation member (not shown) may be included to prevent humid air introduced into the core 300 from leaking through the connection between the first inner housing 310 and the second inner housing 320, and a bearing member (not shown) may be included to allow the first inner housing 310 to rotate relative to the second inner housing 320.

[0055] The first inner housing 310 and the second inner housing 320 can be connected to the intermediate housing 100 and sealed by the encapsulation member, so that the humid air inside the intermediate housing 100 is not introduced into the first cover 200 or the second cover 200', or the dry air of the first cover 200 or the second cover 200' is not introduced into the intermediate housing 100.

[0056] The first encapsulation member 312 connecting the first inner housing 310 to the intermediate housing 100 may further include a bearing member (not shown) for rotating the first inner housing 310. The bearing member may be a ball bearing, roller bearing, etc., and this disclosure is not limited or constrained by the type or characteristics of the bearing.

[0057] For example, refer to Figure 2The first inner housing 310 and the second inner housing 320 are each configured as a cylindrical shape open at both ends, and the first inner housing 310 is configured as a cylinder with a diameter larger than that of the second inner housing 320, such that one end of the second inner housing 320 is inserted into and connected to the interior of one end of the first inner housing 310. For the connection, a bearing member is disposed between the inner surface of the first inner housing 310 and the outer surface of the second inner housing 320 located at the connection portion, such that the first inner housing 310 can be rotatably connected to the second inner housing 320. Common ball bearings, roller bearings, etc., can be used as the bearing member, and this disclosure is not limited or constrained by the type and characteristics of the bearing member.

[0058] Furthermore, a first encapsulation member 312, including a bearing member, is disposed on the outer peripheral surface of the other end of the first inner housing 310 (e.g., the end of the first inner housing 310 that is not connected to the second inner housing 320) to connect the intermediate housing 100 to the first inner housing 310, and a second encapsulation member 322 is disposed on the outer peripheral surface of the other end of the second inner housing 320 (e.g., the end of the second inner housing 320 that is not connected to the first inner housing 310) to connect the second inner housing 320 to the intermediate housing 100.

[0059] refer to Figure 2 and Figure 3 The hollow fiber membrane 400 can be disposed inside the core 300, wherein the first inner shell 310 and the second inner shell 320 form the exterior of the core 300. One end of the hollow fiber membrane 400 can be potted and fixed to the open end of the first inner shell 310, and the other end of the hollow fiber membrane 400 can be potted and fixed to the open end of the second inner shell 320. This disclosure is not limited or constrained by the potting method or potting material.

[0060] In embodiments of this disclosure, the second inner housing 320 can be fixed to the intermediate housing 100 so as not to rotate. Therefore, the hollow fiber membrane 400, which is encapsulated and fixed at one end to the first inner housing 310 and at the other end to the second inner housing 320, is twisted according to the rotation of the first inner housing 310.

[0061] Depending on the initial state of the hollow fiber membrane 400 and the rotation direction of the first inner shell 310, the torsion of the hollow fiber membrane 400 can be increased or decreased.

[0062] For example, when the hollow fiber membrane 400 is initially disposed parallel inside the core 300, the rotation of the first inner shell 310 causes torsion in the hollow fiber membrane 400. On the other hand, when the hollow fiber membrane 400 is initially torsion at a predetermined rotation angle, the torsion can be further increased, decreased, or eliminated depending on the rotation direction of the first inner shell 310.

[0063] Reference Figure 1 and Figure 4 In embodiments of this disclosure, the first inner housing 310 may be configured to adjust the degree of rotation according to the inflow intensity of humid air.

[0064] For this purpose, the first inner housing 310 can be positioned such that its outer peripheral surface faces the humid air inlet 110 of the intermediate housing 100, and the second inner housing 320 can be positioned such that its outer peripheral surface faces the humid air outlet 120 of the intermediate housing 100.

[0065] Additionally, the rotating blade 500 can be disposed on the outer peripheral surface of the first inner housing 310 and can face the humid air inlet 110 in the intermediate housing 100, and be pushed by the hydraulic pressure of the introduced humid air, thus enabling the first inner housing 310 connected to the rotating blade 500 to rotate.

[0066] For example, refer to Figure 4 The rotating blade 500 may be configured to include a plate on one side and may be disposed on the outer peripheral surface of the first inner housing 310 such that the plate faces the introduced humid air perpendicularly. However, this disclosure is not limited thereto, and any shape and position in which the rotating blade 500 is configured to rotate the connected first inner housing 310 by being pushed by the hydraulic pressure of the humid air shall be construed as belonging to this disclosure.

[0067] Additionally, the rotating blade 500 can be connected to the intermediate housing 100 via the elastic member 510, so that the rotation of the first inner housing 310 can be limited to a predetermined range (e.g., the elastic limit of the elastic member 510), and when the hydraulic pressure of the humid air is weaker than the elastic force of the elastic member 510, the rotating blade 500 connected to the elastic member 510 can be pulled back to allow the first inner housing 310 to rotate to its initial state (e.g., the state in which the fuel cell has stopped operating; this also applies below).

[0068] At this time, the elastic member 510 can be configured as a spring, a rubber member, etc., and in some cases, the elastic member 510 can be indirectly connected to the intermediate housing 100 through a fixing member 520 disposed in the intermediate housing 100. However, this disclosure is not limited thereto.

[0069] refer to Figure 3 and Figure 4 In embodiments of this disclosure, the hollow fiber membrane 400 may be configured such that the torsion decreases as the inflow intensity of humid air increases, and the torsion increases as the inflow intensity of humid air decreases.

[0070] For example, the hollow fiber membrane 400 is disposed in a torsional state inside the core 300 in an initial state in which the fuel cell has stopped operating or has just started operating and the first inner shell 310 is not rotating. This initial state is maintained by an elastic member 510 that connects the rotating blades 500 to the intermediate shell 100. Figure 3 and Figure 4 (a) of 400a).

[0071] Subsequently, when the hydraulic pressure of the humid air introduced through the humid air inlet 110 is stronger than the elastic force of the elastic member 510 due to the high-power operation of the fuel cell, the rotating blade 500 is pushed, and thus, the first inner shell 310 rotates to release the torsion of the hollow fiber membrane 400. Figure 3 and Figure 4 (b) of 400b).

[0072] When the torsion of the hollow fiber membrane 400 is released, the gap between the individual hollow fiber membranes 400 within the bundle of the hollow fiber membrane 400 increases, and the effective humidification area of ​​the hollow fiber membrane 400 in contact with the humid air increases, thus increasing the humidification capacity and humidification efficiency.

[0073] Furthermore, when the fuel cell switches from high-power operation to low-power operation, and the hydraulic pressure of the humid air is weaker than the elastic force of the elastic member 510, the rotating blade 500 is pulled back. Therefore, the first inner shell 310 rotates to twist the released hollow fiber membrane 400 again. Figure 3 and Figure 4 (a) of 400a).

[0074] As the hollow fiber membrane 400 is twisted, the gaps between the individual hollow fiber membranes 400 within the bundle of hollow fiber membranes 400 decrease, and the effective humidification area of ​​the hollow fiber membrane 400 in contact with the humid air decreases. Therefore, the humidification capacity and humidification efficiency decrease.

[0075] As described above, the membrane humidifier 10 for a fuel cell, which includes a hollow fiber membrane 400 and a twisted core 300 according to an embodiment of the present disclosure, actively controls the degree of twist of the hollow fiber membrane 400 according to the operating state of the fuel cell or the hydraulic pressure of the humid air introduced through the humid air inlet 110. This means that the humidification amount or humidification efficiency is actively controlled according to the operating state of the fuel cell.

[0076] Next, refer to again Figure 1 and Figure 2 In the embodiments of this disclosure, a first window 311 that can introduce humid air into the outer peripheral surface of the first inner housing 310 can be provided in the core 300, and a second window 321 that can discharge humid air can be provided in the second inner housing 320.

[0077] The first window 311 and the second window 321 can be understood as holes provided in the outer peripheral surfaces of the first inner shell 310 and the second inner shell 320, so that humid air can be introduced into the core 300.

[0078] Therefore, the humid air introduced through the humid air inlet 110 can be introduced into the core 300 through the first window 311 to perform humidification, and can be discharged from the core 300 through the second window 321.

[0079] In embodiments of this disclosure, the opening area of ​​the first window 311 can be set to be larger than the opening area of ​​the second window 321.

[0080] For example, such as Figure 2 As shown, the first window 311 and the second window 321 can be configured as holes with the same predetermined area, and in this case, the number of first windows 311 provided in the outer peripheral surface of the first inner housing 310 can be greater than the number of second windows 321 provided in the second inner housing 320. However, this disclosure is not limited thereto, and the first window 311 and the second window 321 can be configured with different sizes or shapes from each other.

[0081] When the opening area of ​​the first window 311 is larger than the opening area of ​​the second window 321, the flow rate of the humid air introduced into the core 300 is greater than the flow rate of the humid air discharged, and the humid air humidifies for a longer time inside the core 300, thus improving the overall humidification efficiency.

[0082] The above description of this disclosure is for illustrative purposes, and those skilled in the art will understand that it can be readily converted into other specific forms without altering the technical concept or essential characteristics of this disclosure. Therefore, it should be understood that the above embodiments are illustrative in all respects and are not intended to be limiting.

[0083] For example, the present disclosure has been described with reference to embodiments shown in the accompanying drawings, but this is merely exemplary, and those skilled in the art will understand that various changes and modifications can be made to the embodiments therein.

[0084] Therefore, the true technical protection scope of this disclosure is represented by the technical concept of the claims as described in the other description, and all changes or modifications derived from the existing scope of the claims and their equivalents should be interpreted as being included within the scope of this disclosure.

Claims

1. A membrane humidifier for a fuel cell, the membrane humidifier comprising a hollow fiber membrane twisted core, the membrane humidifier comprising: An intermediate housing, comprising a humid air inlet, a humid air outlet, and a core disposed inside the intermediate housing; A first cover portion is attached to one side of the intermediate housing and includes a dry air inlet; as well as A second cover, which is attached to the other side of the intermediate housing, includes a dry air outlet. The core includes: First inner shell; A second inner housing, the second inner housing being connected to the first inner housing; and A hollow fiber membrane is disposed inside the first inner shell and the second inner shell, and has one side fixed to the first inner shell and the other side fixed to the second inner shell. The first inner housing is rotatable relative to the second inner housing.

2. The membrane humidifier for a fuel cell according to claim 1, wherein, The second inner shell is fixed, and the torsion of the hollow fiber membrane is controlled according to the rotation of the first inner shell.

3. The membrane humidifier for a fuel cell according to claim 1, wherein, The first inner housing rotates by humid air supplied to the interior of the intermediate housing via the humid air inlet.

4. The membrane humidifier for a fuel cell according to claim 1, wherein, The degree of rotation of the first inner shell is controlled according to the inflow intensity of humid air.

5. The membrane humidifier for a fuel cell according to claim 1, wherein, The first inner housing is positioned such that the outer peripheral surface of the first inner housing faces the humid air inlet, and The second inner housing is positioned such that the outer peripheral surface of the second inner housing faces the humid air outlet.

6. The membrane humidifier for a fuel cell according to claim 1, wherein, The first inner housing also includes rotating blades on the outer peripheral surface of the first inner housing.

7. The membrane humidifier for a fuel cell according to claim 6, wherein, The rotating blade is connected to the intermediate housing via an elastic member.

8. The membrane humidifier for a fuel cell according to claim 2, wherein, The hollow fiber membrane is configured such that the torsion decreases as the inflow intensity of the humid air increases, and the torsion increases as the inflow intensity of the humid air decreases.

9. The membrane humidifier for a fuel cell according to claim 1, wherein, The first window is disposed in the outer peripheral surface of the first inner shell, and humid air is introduced through the first window. The second window is located on the outer peripheral surface of the second inner shell, through which humid air is discharged.

10. The membrane humidifier for a fuel cell according to claim 9, wherein, The opening area of ​​the first window is larger than the opening area of ​​the second window.

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