Fuel cell membrane humidifier

Abstract

Provided is a fuel cell membrane humidifier in which humidification efficiency is improved by preventing pressure difference loss in a humidification module. The fuel cell membrane humidifier performs moisture exchange between a first fluid and a second fluid, and includes an intermediate housing, a second fluid inlet through which the second fluid is introduced into the intermediate housing, a second fluid outlet through which the second fluid is discharged to the outside, a partition wall configured to divide an internal space of the intermediate housing into a first space and a second space, and at least one cartridge located in the intermediate housing and configured to house a plurality of hollow fiber membranes therein. A cross-sectional area of the second fluid inlet is equal to or greater than a total area of windows constituting first mesh cell units and arranged in a mesh shape in the at least one cartridge for fluid communication with the first space.

Description

Technical Field

[0001] This disclosure relates to a fuel cell membrane humidifier, and more specifically, to a fuel cell membrane humidifier that improves humidification efficiency by preventing differential pressure loss in the humidification module. Background Technology

[0002] A fuel cell is a power-generating battery that produces electricity by combining hydrogen and oxygen. Unlike conventional chemical batteries such as dry cell batteries or storage batteries, a fuel cell can continuously generate electricity as long as hydrogen and oxygen are supplied, and because there is no heat loss, its efficiency is about twice that of an internal combustion engine.

[0003] Furthermore, because the chemical energy generated by the combination of hydrogen and oxygen is directly converted into electrical energy, pollutant emissions are low. Therefore, fuel cells are not only environmentally friendly, but can also reduce concerns about resource depletion due to increased energy consumption.

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

[0005] These fuel cells operate on essentially the same principle, but they differ in the type of fuel used, operating temperature, catalyst, and electrolyte. Among these fuel cells, PEMFCs are known to be the most promising not only for small stationary power generation devices but also for transportation systems because PEMFCs operate at lower temperatures than other fuel cells and can be miniaturized due to their high power density.

[0006] One of the most important factors in improving the performance of PEMFCs is maintaining moisture content by supplying a certain amount or more of water to the polymer electrolyte membrane or proton exchange membrane (PEM) of the membrane electrode assembly (MEA). This is because power generation efficiency decreases rapidly when the polymer electrolyte membrane dries out.

[0007] Examples of humidification methods for polymer electrolyte membranes include: 1) a bubbler humidification method in which water is filled into a pressure vessel and moisture is supplied by passing a target gas through a diffuser; 2) a direct injection method in which the amount of moisture required for the fuel cell reaction is calculated and moisture is supplied directly to a gas flow pipe via a solenoid valve; and 3) a humidification membrane method in which moisture is supplied to a gas fluidized bed using a polymer separator.

[0008] Among these methods, the advantage of humidifying the polymer electrolyte membrane by supplying water vapor to the air supplied to the polymer electrolyte membrane through a membrane that selectively transmits only water vapor contained in the exhaust gas is that the weight and size of the membrane humidifier can be reduced.

[0009] When forming modules, hollow fiber membranes with a large transport area per unit volume are suitable for use as selective transport membranes in humidification membrane methods. That is, when manufacturing membrane humidifiers using hollow fiber membranes, a high degree of integration of hollow fiber membranes with large contact surface areas is possible. Therefore, fuel cells can be adequately humidified even with small amounts, inexpensive materials can be used, and the moisture and heat contained in the exhaust gas discharged from the fuel cell at high temperatures can be collected and reused by the membrane humidifier. Summary of the Invention

[0010] Technical issues

[0011] One object of this disclosure is to provide a fuel cell membrane humidifier that improves humidification efficiency by preventing differential pressure loss in the humidification module.

[0012] Technical solution

[0013] According to one embodiment of this disclosure, a fuel cell membrane humidifier for exchanging moisture between a first fluid and a second fluid includes:

[0014] An intermediate shell; a second fluid inlet through which the second fluid is introduced into the intermediate shell; a second fluid outlet through which the second fluid is discharged to the outside; a partition wall configured to divide the internal space of the intermediate shell into a first space and a second space; and at least one cylinder located within the intermediate shell and configured to house a plurality of hollow fiber membranes therein. The cross-sectional area of ​​the second fluid inlet is equal to or greater than the total area of ​​windows constituting the first mesh unit and arranged in a mesh pattern in the at least one cylinder for fluid communication with the first space.

[0015] In a fuel cell membrane humidifier according to one embodiment of the present disclosure, the total area of ​​the windows constituting the first mesh unit may be equal to or greater than the internal cross-sectional area of ​​at least one cylinder, which does not include the cross-sectional area occupied by a plurality of hollow fiber membranes housed in at least one cylinder.

[0016] In a fuel cell membrane humidifier according to one embodiment of the present disclosure, when the cross-sectional area of ​​the second fluid inlet is CS1, the total area of ​​the windows constituting the first mesh unit is CS2, the cross-sectional area of ​​the at least one cylinder is CS3, and the sum of the cross-sectional areas of the plurality of hollow fiber membranes contained in the at least one cylinder is CS4, the inner diameter of the second fluid inlet can satisfy CS1≥CS2≥CS3-CS4.

[0017] A fuel cell membrane humidifier according to one embodiment of the present disclosure may further include an active bypass unit configured to adjust the flow rate of the second fluid flowing through the first space and the second space based on the flow rate of the second fluid introduced through the second fluid inlet.

[0018] In a fuel cell membrane humidifier according to one embodiment of the present disclosure, the active bypass unit may include: a bypass orifice through the partition wall; and a bypass orifice opening / closing device configured to open / close the bypass orifice according to the flow rate of the second fluid introduced through the second fluid inlet.

[0019] In a fuel cell membrane humidifier according to one embodiment of the present disclosure, the bypass opening / closing device may be a single valve member formed on the partition wall to cover the bypass opening.

[0020] In a fuel cell membrane humidifier according to one embodiment of the present disclosure, the bypass opening / closing device may be a dual-valve member formed on the partition wall to cover both sides of the bypass opening.

[0021] In a fuel cell membrane humidifier according to one embodiment of the present disclosure, the bypass opening / closing device may be a dual-valve member formed on the partition wall to cover both sides of the bypass opening, and the dual-valve member is formed such that at least a portion of the member overlaps.

[0022] In a fuel cell membrane humidifier according to one embodiment of the present disclosure, the bypass orifice opening / closing device may be formed of a flexible material that deforms when pressure increases and returns to its initial shape when pressure decreases.

[0023] Further details of implementations according to various aspects of this disclosure are included in the detailed description below.

[0024] Beneficial effects

[0025] According to the embodiments of this disclosure, humidification efficiency can be improved by preventing pressure loss in the humidification module. Attached Figure Description

[0026] Figure 1This is a front view showing a fuel cell membrane humidifier according to an embodiment of the present disclosure.

[0027] Figure 2 This is a plan view showing a fuel cell membrane humidifier according to an embodiment of the present disclosure.

[0028] Figure 3 It is based on an implementation plan along Figure 2 A cross-sectional view taken from line A-A'.

[0029] Figure 4 This is a side view showing the humidification module, in which Figure 3 The cover of the fuel cell membrane humidifier is removed from the humidification module.

[0030] Figure 5 This is a conceptual view showing the relationship between the cross-sectional area of ​​the second fluid inlet, the total area of ​​the cylinder window, the cross-sectional area of ​​the cylinder, and the sum of the cross-sectional areas of the hollow fiber membrane.

[0031] Figure 6 It is according to another implementation plan along Figure 2 A cross-sectional view taken from line A-A'.

[0032] Figure 7 This is a side view showing the humidification module, in which Figure 6 The cover of the fuel cell membrane humidifier is removed from the humidification module.

[0033] picture Figures 8 to 10 This is a view showing the active bypass unit according to various implementation schemes.

[0034] Figure 11 This is a perspective view showing a cylinder mounted on a fuel cell membrane humidifier according to an embodiment of the present disclosure.

[0035] Figure 12 This is a cross-sectional view showing a cylinder mounted on a fuel cell membrane humidifier according to an embodiment of the present disclosure. Detailed Implementation

[0036] Because this disclosure allows for various changes and multiple implementations, specific implementations will be illustrated and described in the detailed description. However, this is not intended to limit this disclosure to a particular mode of practice, and it should be understood that all changes, equivalents, and substitutions that do not depart from the concept and scope of this disclosure are included in this disclosure.

[0037] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” are intended to include the plural forms as well. Furthermore, as used in this disclosure, the terms “comprising,” “having,” and combinations thereof may be construed as indicating a particular feature, number, step, operation, component, part, or combination thereof, but not as excluding the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Hereinafter, a fuel cell membrane humidifier according to one embodiment of the disclosure will be described with reference to the accompanying drawings.

[0038] Figure 1 This is a front view showing a fuel cell membrane humidifier according to an embodiment of the present disclosure. Figure 2 This is a plan view showing a fuel cell membrane humidifier according to an embodiment of the present disclosure. Figure 3 It is based on an implementation plan along Figure 2 A cross-sectional view taken from line A-A'. Figure 4 This is a side view showing the humidification module, in which Figure 3 The cover of the fuel cell membrane humidifier is removed from the humidification module. Figure 5 This is a conceptual view showing the relationship between the cross-sectional area of ​​the second fluid inlet, the total area of ​​the cylinder window, the cross-sectional area of ​​the cylinder, and the sum of the cross-sectional areas of the hollow fiber membrane.

[0039] like Figures 1 to 4 As shown, a fuel cell membrane humidifier according to one embodiment of the present disclosure includes a humidification module 110 and a cover 120.

[0040] The humidification module 110 performs moisture exchange between a first fluid supplied from the outside and a second fluid discharged from the fuel cell stack (not shown). A cover 120 is fastened to both ends of the humidification module 110. A first fluid inlet 121 is formed in one of the covers 120, through which the first fluid supplied from the outside is supplied to the humidification module 110, and a first fluid outlet 122 is formed in the other of the covers 120, through which the first fluid humidified by the humidification module 110 is supplied to the fuel cell stack.

[0041] The humidification module 110 includes: an intermediate housing 111, including a second fluid inlet 112 and a second fluid outlet 113; and at least one cylinder 20 located within the intermediate housing 111. Second fluid discharged from the fuel cell stack (not shown) is introduced into the second fluid inlet 112 and undergoes moisture exchange in the humidification module 110, and is then discharged to the second fluid outlet 113.

[0042] In this disclosure, the fluid introduced / discharged through the second fluid inlet 112 or the second fluid outlet 113 is not limited to a second fluid. Furthermore, the fluid introduced / discharged through the first fluid inlet 121 or the first outlet 122 is not limited to a first fluid.

[0043] One of the caps 120 can be designed to supply the second fluid to the humidification module 110 to flow through the hollow fiber membrane, and the other of the caps 120 can be designed to discharge the second fluid, which has undergone moisture exchange, to the outside. Furthermore, in this case, the first fluid can be introduced through either the second fluid inlet 112 or the second fluid outlet 113, and the first fluid humidified by the humidification module 110 can be supplied to the fuel cell stack through the other of the second fluid inlet 112 and the second fluid outlet 113. The flow direction of the first fluid and the flow direction of the second fluid can be the same as or opposite to each other.

[0044] The intermediate housing 111 and the cover 120 can each be independently formed of rigid plastic or metal, and can have a circular or polygonal cross-sectional shape in the width direction. Circular includes elliptical, and polygonal includes polygons with rounded corners. Examples of rigid plastics include polycarbonate, polyamide (PA), polyphthalamide (PPA), and polypropylene (PP).

[0045] The internal space of the intermediate shell 111 can be divided into a first space S1 and a second space S2 by a partition wall 114. The flow of the second fluid introduced through the second fluid inlet 112 is blocked by the partition wall 114 and does not immediately discharge to the second fluid outlet 113. Instead, it undergoes moisture exchange while flowing through the cylinder 20 located in the intermediate shell 111, and then discharges to the second fluid outlet 113. The partition wall 114 may have an insertion hole H into which at least one cylinder 20 can be inserted. Reference will be made below. Figure 11 and Figure 12 Description of cylinder 20.

[0046] The second fluid discharged from the fuel cell stack (not shown) has the following flow path: second fluid inlet 112 → first space S1 → cylinder window W → internal space of cylinder 20 → second space S2 → second fluid outlet 113. Within the internal space of cylinder 20 along this flow path, the second fluid exchanges moisture with the first fluid flowing through the hollow fiber membrane 21 to humidify the first fluid.

[0047] When the cross-sectional area of ​​the flow path of the second fluid increases, a pressure drop (pressure differential loss) occurs, and the flow of the second fluid slows down, thereby reducing the humidification efficiency. Specifically, when the flow of the second fluid in the internal space of the cylinder 20 slows down, the humidification efficiency decreases.

[0048] Therefore, in the embodiments of this disclosure, the cross-sectional area of ​​the second fluid inlet 112 is designed by considering the total area of ​​the window W. Specifically, the cross-sectional area of ​​the second fluid inlet 112 can be equal to or greater than the total area of ​​the window W constituting the first mesh unit MH1, which is arranged in a mesh pattern within the cylinder 20 to fluidly communicate with the first space S1. That is, because the cross-sectional area CS1 of the second fluid inlet 112 is large and the total area CS2 of the window W is small, the flow cross-sectional area of ​​the second fluid can be reduced, thereby preventing pressure loss due to a decrease in the velocity of the second fluid.

[0049] Alternatively, the total area of ​​the windows W constituting the first mesh unit MH1 can be designed by taking into account both the cross-sectional area of ​​the cylinder 20 and the cross-sectional area of ​​the plurality of hollow fiber membranes 21 housed within the cylinder 20. More specifically, preferably, the total area of ​​the windows W constituting the first mesh unit MH1 is equal to or greater than the internal cross-sectional area of ​​the cylinder excluding the cross-sectional area occupied by the hollow fiber membranes 21. That is, because the total area CS2 of the windows W is large and the internal cross-sectional areas CS3-CS4 of the cylinder 20 are small, the flow cross-sectional area of ​​the second fluid can be reduced, thereby preventing pressure loss due to a decrease in the velocity of the second fluid.

[0050] like Figure 5 As shown, preferably, when the cross-sectional area of ​​the second fluid inlet 112 is CS1, the total area of ​​the windows constituting the first mesh unit is CS2, the cross-sectional area of ​​the cylinder is CS3, and the sum of the cross-sectional areas of the multiple hollow fiber membranes contained in the cylinder is CS4, the inner diameter of the second fluid inlet 112 satisfies CS1≥CS2≥CS3-CS4.

[0051] Figure 6 It is according to another implementation plan along Figure 2 A cross-sectional view taken from line A-A'. Figure 7 This is a side view showing the humidification module, in which Figure 6 The cover of the fuel cell membrane humidifier is removed from the humidification module.

[0052] Reference Figure 6 and Figure 7 According to another embodiment of this disclosure, a fuel cell membrane humidifier includes a humidification module 110, a cap 120, and an active bypass unit 130. The humidification module 110 and the cap 120 are substantially the same as those described in the above embodiments, and therefore, a repeated description will be omitted.

[0053] The active bypass unit 130 regulates the flow rate of the second fluid flowing through the first space S1 and the second space S2 based on the flow rate of the second fluid introduced through the second fluid inlet 112. The active bypass unit 130 includes a bypass port 131 and a bypass port opening / closing device 132.

[0054] The bypass hole 131 passes through the partition wall 114. The bypass hole 131 can be formed into any shape among various polygons or circles, such as triangles, quadrilaterals, circles or ellipses.

[0055] The bypass opening / closing device 132 may be formed of a flexible material that deforms when pressure increases and returns to its initial shape when pressure decreases. For example, the bypass opening / closing device 132 may include a resilient valve formed of an elastic material (e.g., rubber).

[0056] The bypass orifice opening / closing device 132, including the resilient valve, opens / closes the bypass orifice 131 according to the flow rate of the second fluid introduced through the second fluid inlet 112.

[0057] When the flow rate of the second fluid increases, the pressure increases with the increased flow rate, and the resilient valve can deform in the pressure direction to at least partially open the bypass orifice 131. When the flow rate of the second fluid decreases, the pressure decreases with the decreased flow rate, and the resilient valve can return to its initial shape to at least partially close the bypass orifice 131.

[0058] Figures 8 to 10 This is a view showing the active bypass unit according to various implementation schemes.

[0059] like Figure 8 As shown, the active bypass unit 130 may include a bypass orifice 131 and a single valve member 132a formed on the partition wall 114 to cover the bypass orifice 131. Because the single valve member 132a only needs to be formed on one side around the bypass orifice 131, the manufacturing process is simple. This can be the most basic type of active bypass unit 130.

[0060] like Figure 9 As shown, the active bypass unit 130 may include a bypass orifice 131 and dual valve members 132b formed on the partition wall 114 to cover both sides of the bypass orifice 131. Because the dual valve members 132b are formed on both sides around the bypass orifice 131, they can respond more sensitively to changes in the flow rate of the second fluid. This can be a more advantageous type when the volume of the fuel cell membrane humidifier is smaller than the basic type.

[0061] like Figure 10As shown, the active bypass unit 130 may include a bypass orifice 131 and a dual-valve member 132c formed on the partition wall 114 to cover both sides of the bypass orifice 131 and at least partially overlap, the dual-valve member being formed such that at least a portion of the members overlap. Because the dual-valve member 132c at least partially overlaps, it can respond more sluggishly to changes in the flow rate of the second fluid. This can be a more advantageous type when the volume of the fuel cell membrane humidifier is larger than the basic type.

[0062] A portion of the second fluid introduced into the second fluid inlet 112 can flow from the first space S1 to the second space S2 through the active bypass unit 130, depending on the flow rate of the second fluid, and is discharged to the second fluid outlet 113. Because the second fluid flowing through the active bypass unit 130 does not contact the first fluid, no moisture exchange occurs.

[0063] When the volume of the fuel cell membrane humidifier decreases, the pressure differential within the humidifier may increase abnormally due to the second fluid introduced from the fuel cell stack. Therefore, since this abnormally increased pressure differential may adversely affect the efficiency of the fuel cell membrane humidifier, it is necessary to appropriately mitigate the pressure differential. The abnormally increased pressure differential can be mitigated because the active bypass unit 130 allows a portion of the introduced second fluid to bypass the hollow fiber membrane and be discharged to the outside based on the flow rate of the second fluid.

[0064] Therefore, the fuel cell membrane humidifier including the active bypass unit 130 according to the embodiments of this disclosure is more advantageous in terms of volume reduction.

[0065] Figure 11 This is a perspective view showing a cylinder mounted on a fuel cell membrane humidifier according to an embodiment of the present disclosure. Figure 12 This is a cross-sectional view showing a cylinder mounted on a fuel cell membrane humidifier according to an embodiment of the present disclosure.

[0066] Reference Figure 11 and Figure 12 The cylinder 20 includes multiple hollow fiber membranes 21, a potting unit 22, and an inner shell 23.

[0067] Hollow fiber membrane 21 may include a polymer membrane formed from polysulfone resin, polyethersulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride (PVDF) resin, polyacrylonitrile (PAN) resin, polyimide resin, polyamide-imide resin, polyester-imide resin, or a mixture of at least two of the above materials.

[0068] The potting unit 22 secures the end of the hollow fiber membrane 21. The potting unit 22 can be formed by curing a liquid resin, such as a liquid polyurethane resin, using casting methods such as deep potting or centrifugal potting.

[0069] The inner housing 23 has an opening at each end, and a plurality of hollow fiber membranes 21 are housed within the inner housing 23. A potting unit 22, at the end of each hollow fiber membrane 21, seals the opening of the inner housing 23. The inner housing 23 includes: a first mesh unit MH1, arranged in a mesh pattern for fluid communication with a first space S1; and a second mesh unit MH2, arranged in a mesh pattern for fluid communication with a second space S2. Each of the first mesh unit MH1 and the second mesh unit MH2 includes a plurality of windows W.

[0070] The second fluid, introduced into the first space S1 of the intermediate shell 111 through the second fluid inlet 112, flows into the inner shell 23 through the first mesh unit MH1 and contacts the outer surface of the hollow fiber membrane 21. Next, the second fluid, which has exchanged moisture with the first fluid, escapes into the second space S2 through the second mesh unit MH2, and then exits from the intermediate shell 111 through the second fluid outlet 113.

[0071] When the flow direction of the second fluid is opposite to that of the first fluid introduced into the first fluid inlet 121, the second fluid introduced into the second space S2 of the intermediate shell 111 through the second fluid outlet 113 flows into the inner shell 23 through the second mesh unit MH2 and contacts the outer surface of the hollow fiber membrane 21. Next, the second fluid, which has exchanged moisture with the first fluid, escapes into the first space S1 through the first mesh unit MH1, and then exits from the intermediate shell 111 through the second fluid inlet 112.

[0072] A gasket (not shown) may be disposed between the intermediate housing 111 and the cylinder 210. The gasket allows the cylinder 20 to be mechanically assembled onto the humidification module 110. Therefore, when an abnormality occurs in a specific part of the humidification module 110 (e.g., the cylinder 20), the intermediate housing 111 and the gasket can be easily mechanically separated from the humidification module 110, and then only the corresponding part can be repaired or replaced.

[0073] While one or more embodiments of this disclosure have been described, those skilled in the art will understand that this disclosure can be modified and altered in various ways by adding, changing, or removing components without departing from the scope of this disclosure as set forth in the claims, and such modifications or alterations fall within the scope of this disclosure.

[0074] [Explanation of reference numerals in the attached figures]

[0075] 110: Humidification module; 111: Intermediate housing

[0076] 112: Second fluid inlet; 113: Second fluid outlet

[0077] 114: Partition wall; 120: Cap.

[0078] 130: Active bypass unit

[0079] 20: Cylinder body; 21: Hollow fiber membrane

[0080] 22: Encapsulation unit; 23: Inner shell

[0081] MH1: First mesh element; MH2: Second mesh element

[0082] W: Window

[0083] CS1: Cross-sectional area of ​​the second fluid inlet; CS2: Total area of ​​the window.

[0084] CS3: Cross-sectional area of ​​the cylinder

[0085] CS4: The total cross-sectional area of ​​the multiple hollow fiber membranes housed within the cylinder.

Claims

1. A fuel cell membrane humidifier for exchanging moisture between a first fluid and a second fluid, the fuel cell membrane humidifier comprising: intermediate shell; The second fluid inlet is through which the second fluid is introduced into the intermediate housing; The second fluid outlet is through which the second fluid is discharged to the outside; A partition wall is configured to divide the internal space of the intermediate housing into a first space and a second space; and At least one cylindrical body is located within the intermediate shell and configured to house a plurality of hollow fiber membranes therein. Wherein, the cross-sectional area of ​​the second fluid inlet is equal to or greater than the total area of ​​the windows that constitute the first mesh unit and are arranged in a mesh pattern in the at least one cylinder for fluid communication with the first space.

2. The fuel cell membrane humidifier according to claim 1, wherein, The total area of ​​the windows constituting the first mesh unit is equal to or greater than the internal cross-sectional area of ​​the at least one cylinder, the internal cross-sectional area excluding the cross-sectional area occupied by the plurality of hollow fiber membranes housed in the at least one cylinder.

3. The fuel cell membrane humidifier according to claim 1, wherein, When the cross-sectional area of ​​the second fluid inlet is CS1, the total area of ​​the windows constituting the first mesh unit is CS2, the cross-sectional area of ​​the at least one cylinder is CS3, and the sum of the cross-sectional areas of the plurality of hollow fiber membranes contained in the at least one cylinder is CS4, the inner diameter of the second fluid inlet satisfies CS1≥CS2≥CS3-CS4.

4. The fuel cell membrane humidifier according to claim 1, further comprising an active bypass unit, the active bypass unit being configured to adjust the flow rate of the second fluid flowing through the first space and the second space according to the flow rate of the second fluid introduced through the second fluid inlet.

5. The fuel cell membrane humidifier according to claim 4, wherein, The active bypass unit includes: A bypass hole passes through the partition wall; and A bypass orifice opening / closing device is configured to open / close the bypass orifice according to the flow rate of the second fluid introduced through the second fluid inlet.

6. The fuel cell membrane humidifier according to claim 5, wherein, The bypass opening / closing device is a single valve component formed on the partition wall to cover the bypass hole.

7. The fuel cell membrane humidifier according to claim 5, wherein, The bypass opening / closing device is a dual-valve component formed on the partition wall to cover both sides of the bypass opening.

8. The fuel cell membrane humidifier according to claim 5, wherein, The bypass opening / closing device is a dual-valve member formed on the partition wall to cover both sides of the bypass opening, and the dual-valve member is formed such that at least a portion of the member overlaps.

9. The fuel cell membrane humidifier according to any one of claims 5 to 8, wherein, The bypass opening / closing device is formed of a flexible material that deforms when pressure increases and returns to its initial shape when pressure decreases.

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