Hollow fiber membrane cartridge, fuel cell humidifier and fuel cell including the same

Abstract

The present invention relates to a hollow fiber membrane cartridge, a humidifier for a fuel cell, and a fuel cell including the same, which have excellent heat resistance and hydrolysis resistance, a heat distortion temperature of 120°C or higher, and a moisture absorption rate of 1% or less, so as to minimize deterioration of mechanical properties and dimensional deformation that may occur during use of the fuel cell and increase the durability life of the product.

Description

[Technical Field]

[0001] The present invention relates to a hollow fiber membrane cartridge characterized by heat resistance and hydrolysis resistance against high-temperature and high-humidity humidifying fluids, a humidifier for a fuel cell, and a fuel cell including the same. [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 batteries and storage batteries, fuel cells can continuously produce electricity as long as hydrogen and oxygen are supplied, have the advantage of not losing heat, and are more efficient than internal combustion engines. In addition, because the chemical energy generated by the combination of hydrogen and oxygen is directly converted into electrical energy, fuel cells emit fewer pollutants, making them not only environmentally friendly but also reducing concerns about resource depletion due to increased energy consumption. Among various types of fuel cells, polymer electrolyte membrane fuel cells (PEMFCs) are known to be promising not only as small-scale stationary power generation devices but also as transportation systems, because they can operate at low temperatures, have a high power density, and can be miniaturized. One of the key factors in improving the performance of polymer electrolyte membrane fuel cells (PEMFCs) is to maintain the moisture content by supplying a certain amount of moisture to the polymer electrolyte membrane (also known as proton exchange membrane: PEM) of the membrane electrode assembly (MEA). Humidification is necessary to maintain the moisture content. The selectively permeable membrane used for humidification can be a hollow fiber membrane with a large permeation area per unit volume. When a humidifier is manufactured using a hollow fiber membrane, it is possible to highly integrate hollow fiber membranes with a large contact surface area, so that sufficient humidification of the fuel cell can be achieved even with a small capacity. It also has the advantages of being able to use low-cost materials and being able to recover moisture and heat contained in the off-gas discharged at high temperatures from the fuel cell and reuse them in the humidifier. Since the humidifier using the hollow fiber membrane is exposed to a high-temperature and high-humidity humidifying fluid during the humidification process, the material constituting the humidifier is required to have heat resistance and hydrolysis resistance. Therefore, it is necessary to develop a material for a humidifier having excellent heat resistance and hydrolysis resistance. Summary of the Invention [Problem to be solved by the invention]

[0003] One embodiment of the present invention has been devised in consideration of the above points, and aims to provide a hollow fiber membrane cartridge having excellent heat resistance. Another embodiment of the present invention seeks to provide a hollow fiber membrane cartridge having excellent hydrolysis resistance. Another embodiment of the present invention provides a hollow fiber membrane cartridge having excellent mechanical properties and dimensional stability. Another embodiment of the present invention provides a humidifier for a fuel cell including the hollow fiber membrane cartridge described above. Another embodiment of the present invention provides a fuel cell including the above-described fuel cell humidifier. [Means for solving the problem]

[0004] In order to solve the above problems, an embodiment of the present invention may include the following configurations. A hollow fiber membrane cartridge according to an embodiment of the present invention may include an inner case having an internal space, a plurality of hollow fiber membranes disposed in the internal space of the inner case, a first potting member disposed on one side of the inner case and fixing one side of the plurality of hollow fiber membranes, and a second potting member disposed on the other side of the inner case and fixing the other side of the plurality of hollow fiber membranes. The inner case may have a heat distortion temperature of 120°C or more and a moisture absorption of 1% or less. The inner case may have a moisture absorption rate of 0.5% or less. The inner case may include a polymer resin. The polymer resin may include at least one selected from polyphenylene ether (PPE), polyphenylsulfone (PPSU), polysulfone (PSU), polyetheretherketone (PEEK), and polyarylate (PAR). The polyphenylene ether (PPE) may be a polyphenylene ether modified with polystyrene-butadiene copolymer (HIPS) (m-PPE). The m-PPE may contain 90 to 99 wt % of polyphenylene ether (PPE) and 1 to 10 wt % of polystyrene-butadiene copolymer (HIPS) based on the total weight of the m-PPE. The inner case may have a weight loss rate of 10% or less after high temperature and high humidity treatment. Here, the high temperature and high humidity treatment means placing the inner case in an autoclave filled with water, setting the autoclave to a temperature of 120°C ± 3°C, and treating for 200 hours. The inner case is 100 x 10 -6 It may have a coefficient of thermal expansion (CTE) of mm / mm / °C or less. The inner case has a specific gravity of 1.5 g / cm 3 It may be the following: A humidifier for a fuel cell according to another embodiment of the present invention may include a mid-case having an internal space, an exhaust gas inlet and an exhaust gas outlet, the hollow fiber membrane cartridge described above disposed in the internal space of the mid-case, a first cap coupled to one end of the mid-case, and a second cap coupled to the other end of the mid-case. A fuel cell according to another embodiment of the present invention may include a cell stack and the humidifier for the fuel cell connected to the cell stack. [Effects of the Invention]

[0005] The hollow fiber membrane cartridge according to an embodiment of the present invention may have excellent heat resistance and hydrolysis resistance. In addition, the hollow fiber membrane cartridge according to an embodiment of the present invention may have excellent mechanical properties and dimensional stability. The humidifier for a fuel cell according to another embodiment of the present invention, including the hollow fiber membrane cartridge, may have excellent heat resistance, hydrolysis resistance, mechanical properties, and dimensional stability. The fuel cell according to another embodiment of the present invention, including the fuel cell humidifier, may have excellent heat resistance, hydrolysis resistance, mechanical properties, and dimensional stability. The fuel cell according to another embodiment of the present invention may have excellent durability and long life, and may prevent or suppress problems such as breakage and malfunction. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic perspective view of a hollow fiber membrane cartridge according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of a hollow fiber membrane according to an embodiment of the present invention. [Figure 3] FIG. 10 is a schematic exploded perspective view of a humidifier for a fuel cell according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0007] The present invention can be modified in various ways and can have a plurality of embodiments, but a specific embodiment will be described in detail below with reference to the accompanying drawings. When the terms "include," "have," "perform," etc. are used in this specification, other parts may be added unless the expression "only" is used. When an element is expressed in the singular, it includes the plural unless otherwise expressly stated. Furthermore, when interpreting an element, it is interpreted as including a margin of error even if there is no other explicit statement. Terms such as first, second, etc. may be used to describe various components, but the components are not limited by the terms, and the terms are used only to distinguish one component from another. FIG. 1 is a schematic perspective view of a hollow fiber membrane cartridge (100) according to one embodiment of the present invention. Referring to FIG. 1, a hollow fiber membrane cartridge (100) according to one embodiment of the present invention may include an inner case (110), a plurality of hollow fiber membranes (120), a first potting portion (131) and a second potting portion (132). The inner case 110 may have an internal space. The inner case 110 may have a box shape with both ends open. One of the open ends of the inner case 110 is referred to as one side, and the other is referred to as the other side. A plurality of hollow fiber membranes (120) can be disposed in the interior space of the inner case (110). FIG. 2 is a perspective view of a hollow fiber membrane (120) according to one embodiment of the present invention. Referring to Figure 2, a hollow fiber membrane (120) according to one embodiment of the present invention may have a hollow (121). For example, the hollow fiber membrane (120) may have a tubular shape with a hollow center. A commercially available hollow fiber membrane may be used as the hollow fiber membrane (120). According to one embodiment of the present invention, one end of the tubular hollow fiber membrane 120 is referred to as one side, and the other end is referred to as the other side. The first potting part 131 is coupled to one side of the inner case 110 and can fix one side of the hollow fiber membranes 120. The second potting part 132 is coupled to the other side of the inner case 110 and can fix the other side of the hollow fiber membranes 120. Both ends of the hollow fiber membrane cartridge 100 are potted with a first potting portion 131 and a second potting portion 132. In this case, the first potting portion 131 and the second potting portion 132 can be formed so as not to block the hollows of the plurality of hollow fiber membranes 120. The first potting portion 131 and the second potting portion 132 are generally formed by hardening a liquid polymer such as liquid polyurethane (PU) resin using a casting method. The inner case 110 according to an embodiment of the present invention may have a heat distortion temperature of 120° C. or more.

[0008] The heat distortion temperature can be measured using a test piece of the inner case 110. The test piece of the inner case 110 is, for example, a test piece made of a material for inner cases. Hereinafter, the test piece of the inner case 110 will also be referred to as the "test piece." According to one embodiment of the present invention, the heat distortion temperature can be measured according to ASTM D 648. To measure the heat distortion temperature, a 4 mm thick unannealed test piece is prepared. The temperature is increased from room temperature (25°C) at a rate of 2°C / min while applying a pressure stress of 1.8 MPa to the test piece. The temperature at which the test piece bends by 0.25 mm is the heat distortion temperature. If the heat distortion temperature of the inner case (110) is less than 120°C, the high-temperature humidifying fluid may cause dimensional or shape deformation, which may result in peeling at the adhesive interface between the first potting part (131) and the inner case (110) or the adhesive interface between the second potting part (132) and the inner case (110). The heat distortion temperature of the inner case 110 according to an embodiment of the present invention may be, for example, 140° C. or higher. More specifically, the heat distortion temperature of the inner case 110 according to an embodiment of the present invention may be 150°C or higher, or 160°C or higher. The inner case 110 according to an embodiment of the present invention may have a moisture absorption rate of 1% or less. The moisture absorption can be determined, for example, by immersing a test piece of the inner case (110) in water at 23° C. for 24 hours and then measuring the amount of moisture absorbed by the test piece in accordance with ASTM D 570. Hygroscopicity can be measured by the following equation 1:

number

[0009] According to one embodiment of the present invention, the m-PPE may comprise 90-99 wt % polyphenylene ether (PPE) and 1-10 wt % polystyrene-butadiene copolymer (HIPS) based on the total weight of the m-PPE. If the polyphenylene ether (PPE) content is less than 90% by weight of the total weight of m-PPE, problems with heat resistance or mechanical strength may occur, and if it exceeds 99% by weight, the specific gravity of polyphenylene ether (PPE) is too high, making it difficult to express the properties of HIPS and causing problems with moldability. According to one embodiment of the present invention, the m-PPE may have a Mw molecular weight (weight average molecular weight) of 70,000 to 100,000. According to one embodiment of the present invention, the inner case 110 can have excellent hydrolysis resistance. If the inner case 110 is not hydrolysis resistant, the polymer constituting the inner case 110 may be hydrolyzed by the high-temperature and high-humidity humidifying fluid, which may cause a rapid deterioration in the mechanical properties of the inner case 110. As a result, problems such as peeling may occur between the inner case 110 and the potting parts 131, 132 of the hollow fiber membrane cartridge 100. According to one embodiment of the present invention, the hydrolysis resistance of the inner case (110) can be evaluated by the weight loss rate of the inner case (110). The inner case 110 according to one embodiment of the present invention has excellent hydrolysis resistance and undergoes little or no weight loss even after high temperature and high humidity treatment. The inner case 110 according to an embodiment of the present invention may have a weight reduction rate (WR) of 10% or less. The weight loss rate (WR) can be measured by the following equation 2.

number

[0010] To evaluate the peeling characteristics, according to one embodiment of the present invention, the hollow fiber membrane cartridge 100 is subjected to high temperature and high humidity treatment, and then the presence or absence of peeling between the inner case 110 and the potting parts 131, 132 is confirmed. The hollow fiber membrane cartridge 100 can be subjected to high temperature and high humidity treatment using an autoclave. The high temperature and high humidity treatment conditions for evaluating the peeling properties according to one embodiment of the present invention are as follows: the hollow fiber membrane cartridge (100) is placed in an autoclave filled with water, and the temperature of the autoclave is set to 120°C ± 3°C for 200 hours. According to one embodiment of the present invention, when separation or separation occurs between the inner case (110) and the potting portion (131, 132), it is evaluated that delamination has occurred between the inner case (110) and the potting portion (131, 132). According to one embodiment of the present invention, even after high temperature and high humidity treatment, separation does not occur between the inner case 110 and the potting parts 131 and 132 of the hollow fiber membrane cartridge 100. According to one embodiment of the present invention, separation between the inner case (110) and the potting parts (131, 132) does not occur, and therefore, breakdown or damage to the humidifier or fuel cell including the inner case (110) can be prevented. The inner case 110 according to one embodiment of the present invention is 100 x 10 -6 It may have a coefficient of thermal expansion (CTE) of mm / mm / °C or less. The thermal expansion coefficient can be measured, for example, using Thermomechanical Analysis (TMA) in accordance with the TMA Method and ASTM E 696. For Thermomechanical Analysis (TMA), for example, a Q400 from TA Instruments can be used. Thermal expansion coefficient is 100 x 10 -6 If it exceeds mm / mm / ℃, repeated temperature changes that occur during use will cause large dimensional changes, and the resulting accumulation of stress may cause the adhesive interface between the inner case (110) and the potting parts (131, 132) to peel off, or the humidifier or fuel cell including the inner case (110) may be damaged and malfunction. The inner case (110) according to one embodiment of the present invention has a specific gravity of 1.5 g / cm 3 It may be the following: The specific gravity of the inner case 110 can be measured, for example, according to ASTM D 792. The inner case 110 according to one embodiment of the present invention has excellent mechanical properties and a low specific gravity, which can contribute to lightweight product designs. FIG. 3 is a schematic exploded perspective view of a humidifier (200) for a fuel cell according to another embodiment of the present invention. Referring to FIG. 3, a humidifier (200) for a fuel cell according to another embodiment of the present invention may include a mid-case (210), a first cap (221) and a second cap (222).

[0011] The mid-case (210) may have an internal space in which at least one hollow fiber membrane cartridge (100) may be placed. The mid-case 210 may have a box shape with both ends open, one of which is referred to as one end and the other as the other end. A first cap (221) may be coupled to one end of the mid-case (210), and a second cap (222) may be coupled to the other end of the mid-case (210). The resin layer 213 can be disposed between the midcase 210 and the hollow fiber membrane cartridge 100, so that the hollow fiber membrane cartridge 100 is fixed to the midcase 210. For example, the resin layer 213 can be disposed at one end and the other end of the midcase 210. One space can be formed by the first cap (221) and the resin layer (213), and another space can be formed by the second cap (222) and the resin layer (213). Another space can be formed by the resin layer (213) arranged at one end of the midcase (210) and the resin layer (213) arranged at the other end of the midcase (210). The resin layer 213 can be disposed in the interior space of the mid-case 210 by, for example, a casting method, and can be formed by curing a liquid polymer such as liquid polyurethane (PU) resin. The midcase (210) may include an off-gas inlet (211) and an off-gas outlet (212). The off-gas that flows into the midcase (210) through the off-gas inlet (211) comes into contact with the outer surfaces of the hollow fiber membranes (120) and is then discharged from the midcase (210) through the off-gas outlet (212). When the off-gas comes into contact with the outer surfaces of the hollow fiber membranes (120), moisture contained in the off-gas permeates the hollow fiber membranes (120), thereby humidifying the air flowing through the hollow fiber membranes (120). Another embodiment of the present invention provides a fuel cell including a cell stack (not shown) and the fuel cell humidifier (200) connected to the cell stack. The present invention will be described below with more specific examples and comparative examples. However, the following examples are merely intended to aid in understanding the present invention and are not intended to limit the scope of the present invention.

[0012] Example 1 (1) Manufacturing of inner case (110) The polymer resin used was m-PPE (molecular weight: 85,000) containing polyphenylene ether (PPE) and polystyrene-butadiene copolymer (HIPS), and the inner case (110) having an internal space was manufactured by melting and molding this. (2) Manufacture of hollow fiber membrane cartridge (100) A bundle was prepared using hollow fiber membranes (120) and placed in the inner space of the inner case (110). Polyurethane (PU) was prepared for forming the first potting portion (131) and the second potting portion (132). A first potting part (131) is formed on one side of the inner case (110) by a casting method, and a second potting part (132) is formed on the other side of the inner case (110) so that the hollow fiber membrane (120) is fixed to the inner case (110). By this method, the hollow fiber membrane cartridge (100) according to Example 1 was produced. <Example 2> (1) Manufacturing of inner case (110) An inner case (110) was produced in the same manner as in Example 1 (1), except that polyphenylsulfone (PPSU) was used instead of m-PPE. (2) Manufacture of hollow fiber membrane cartridge (100) A hollow fiber membrane cartridge (100) was manufactured in the same manner as in Example 1 (2), except that an inner case (110) made of polyphenylsulfone (PPSU) was used. Example 3 (1) Manufacturing of inner case (110) An inner case (110) was produced in the same manner as in Example 1 (1), except that polysulfone (PSU) was used instead of m-PPE. (2) Manufacture of hollow fiber membrane cartridge (100) A hollow fiber membrane cartridge (100) was manufactured in the same manner as in Example 1(2), except that an inner case (110) made of polysulfone (PSU) was used. Example 4 (1) Manufacturing of inner case (110) An inner case (110) was produced in the same manner as in Example 1 (1), except that polyether ether ketone (PEEK) was used instead of m-PPE. (2) Manufacture of hollow fiber membrane cartridge (100) A hollow fiber membrane cartridge (100) was manufactured in the same manner as in Example 1 (2), except that an inner case (110) made of polyether ether ketone (PEEK) was used.

[0013] <Example 5> (1) Manufacturing of inner case (110) An inner case (110) was produced in the same manner as in Example 1 (1), except that polyarylate (PAR) was used instead of m-PPE. (2) Manufacture of hollow fiber membrane cartridge (100) A hollow fiber membrane cartridge (100) was produced in the same manner as in Example 1 (2), except that an inner case (110) made of polyarylate (PAR) was used. <Comparative Example> (1) Manufacturing of inner case (110) An inner case (110) was produced in the same manner as in Example 1 (1), except that polycarbonate (PC) was used instead of m-PPE. (2) Manufacture of hollow fiber membrane cartridge (100) A hollow fiber membrane cartridge (100) was produced in the same manner as in Example 1 (2), except that an inner case (110) made of polycarbonate (PC) was used. The physical properties of the inner cases (110) and hollow fiber membrane cartridges (100) manufactured in Examples 1 to 5 and Comparative Example were measured by the following methods. <Heat distortion temperature (HDT) measurement> 1) The heat distortion temperature of the inner case (110) manufactured according to Examples 1 to 5 and the comparative example was determined by supporting both ends of the test piece in a heating bath, placing a rod at the center of the test piece, applying a predetermined bending stress, and raising the temperature of the heating medium from room temperature (25°C) at a rate of 2°C / min, and measuring the temperature of the heating medium when the warp of the test piece reached a predetermined value. 2) More specifically, the heat distortion temperature of the inner cases (110) manufactured according to Examples 1 to 5 and the Comparative Example was measured according to ASTM D 648. To measure the heat distortion temperature, 4 mm thick unannealed (non-heat treated) test specimens were prepared according to Examples 1 to 5 and the Comparative Example, and placed in a heating bath as in 1) above. After that, a pressure stress of 1.8 MPa was applied to the test specimen while the temperature of the heating medium was increased from room temperature (25°C) at a rate of 2°C / min, and the temperature at which the test specimen warped by 0.25 mm was measured as the heat distortion temperature (HDT). <Hygroscopicity measurement> The moisture absorption of the inner cases (110) manufactured according to Examples 1 to 5 and the comparative example was measured as follows. The test pieces of the inner case (110) manufactured according to Examples 1 to 5 and the Comparative Example were dried in an oven at 50°C for 24 hours, and then cooled in a desiccator, after which their weights were measured as "initial test piece weights." The test pieces of the inner case (110) whose initial test piece weights had been measured were then immersed in water at 23°C for 24 hours, removed, and their surface moisture was wiped off. The weights were measured as "test piece weights after moisture absorption." The "initial test piece weights" and "test piece weights after moisture absorption" were then compared, and the moisture absorption (adsorption) amounts of the test pieces of the inner case (110) were measured according to ASTM D 570. The moisture absorption of the inner cases (110) manufactured according to Examples 1 to 5 and the Comparative Example was calculated using the following formula 1.

number

[0014] <Weight loss rate measurement> The weight loss rate (WR) of the inner cases (110) manufactured according to Examples 1 to 5 and the Comparative Example was measured by subjecting test pieces of the inner cases (110) manufactured according to Examples 1 to 5 and the Comparative Example to high temperature and high humidity treatment using an autoclave. The high temperature and high humidity treatment conditions for measuring the weight loss rate (WR) are as follows: a test piece of the inner case (110) is placed in an autoclave filled with water, and then the autoclave is set to a temperature of 120°C ± 3°C and treated for 200 hours. The weight loss rate (WR) of the inner cases (110) manufactured according to Examples 1 to 5 and the Comparative Example was calculated using the following formula 2.

number

[0015] <Specific gravity measurement> The specific gravity of the inner case (110) manufactured according to Examples 1 to 5 and the Comparative Example was measured in accordance with ASTM D 792 using a water displacement method in which the mass of each test piece of the inner case (110) was measured in air, and then the apparent mass when immersed in liquid was measured to calculate the specific gravity. The measurement results are shown in Table 1 below. [Table 1] Referring to Table 1, it can be seen that the inner case 110 and hollow fiber membrane cartridge 100 according to Examples 1 to 5 have excellent heat distortion temperature, excellent hydrolysis resistance, low moisture absorption, low coefficient of thermal expansion, and low specific gravity. On the other hand, it can be seen that the inner case 110 and hollow fiber membrane cartridge 100 according to the comparative example have excellent coefficient of thermal expansion and specific gravity, but have a low heat distortion temperature and high moisture absorption. In particular, after high temperature and high humidity treatment using an autoclave, the weight loss rate of the test piece of the inner case (110) according to the comparative example was as high as 40%. In addition, after high temperature and high humidity treatment using an autoclave, peeling occurred between the inner case (110) and the potting parts (131, 132) of the hollow fiber membrane cartridge (100) according to the comparative example, confirming that the cartridge has insufficient hydrolysis resistance. The above description merely exemplifies the technical concept of the present invention, and various modifications and variations may be made by those skilled in the art without departing from the essential characteristics of the present invention. Furthermore, the embodiments disclosed herein are for illustrative purposes only and are not intended to limit the technical concept of the present invention. Therefore, the scope of the present invention should be interpreted by the scope of the claims, and all technical concepts within the scope of the claims should be interpreted as being within the scope of the present invention. [Explanation of symbols]

[0016] 100: Hollow fiber membrane cartridge 110: Inner case 120: Hollow fiber membrane 121: Hollow 131: First potting part 132: Second potting part 200: Humidifier for fuel cells 210: Mid-case 211: Exhaust gas inlet 212: Exhaust gas outlet 213: Resin layer 221: First cap 222: Second Cap

Claims

1. an inner case having an internal space; a plurality of hollow fiber membranes disposed in the internal space of the inner case; a first potting portion disposed on one side of the inner case and fixing one side of the plurality of hollow fiber membranes; and a second potting portion disposed on the other side of the inner case and fixing the other sides of the plurality of hollow fiber membranes; The inner case has a heat distortion temperature of 120°C or higher and a moisture absorption rate of 1% or less. Hollow fiber membrane cartridge.

2. 2. The hollow fiber membrane cartridge according to claim 1, wherein the inner case has a moisture absorption of 0.5% or less.

3. 2. The hollow fiber membrane cartridge according to claim 1, wherein the inner case contains a polymer resin.

4. 4. The hollow fiber membrane cartridge according to claim 3, wherein the polymer resin comprises at least one selected from the group consisting of polyphenylene ether (PPE), polyphenylsulfone (PPSU), polysulfone (PSU), polyether ether ketone (PEEK), and polyarylate (PAR).

5. 5. The hollow fiber membrane cartridge according to claim 4, wherein the polyphenylene ether (PPE) is polyphenylene ether (m-PPE) modified with polystyrene-butadiene copolymer (HIPS).

6. The hollow fiber membrane cartridge according to claim 5, wherein the m-PPE contains 90 to 99 wt% polyphenylene ether (PPE) and 1 to 10 wt% polystyrene-butadiene copolymer (HIPS) based on the total weight of the m-PPE.

7. The hollow fiber membrane cartridge according to claim 1, wherein the inner case has a weight loss rate of 10% or less after high-temperature and high-humidity treatment. Here, the high temperature and high humidity treatment means placing the inner case in an autoclave filled with water, setting the autoclave to a temperature of 120°C ± 3°C, and treating for 200 hours.

8. The inner case is 100 x 10 -6 2. The hollow fiber membrane cartridge according to claim 1, having a coefficient of thermal expansion (CTE) of mm / mm / °C or less.

9. The inner case has a specific gravity of 1.5 g / cm 3 2. The hollow fiber membrane cartridge according to claim 1, wherein:

10. a mid-case having an interior space, an exhaust gas inlet, and an exhaust gas outlet; a hollow fiber membrane cartridge according to any one of claims 1 to 9, disposed in the internal space of the midcase; a first cap coupled to one end of the midcase; and The humidifier for a fuel cell includes a second cap coupled to the other end of the mid-case.

11. a battery stack; and 11. A fuel cell comprising: a fuel cell humidifier according to claim 10 coupled to the cell stack.

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