Humidifier for fuel cells with bypass baffle

Abstract

The present invention relates to a fuel cell humidifier equipped with a bypass-type baffle, and is characterized in that it includes an intermediate case having an exhaust gas inlet into which exhaust gas discharged from a fuel cell stack flows in and an exhaust gas outlet for discharging exhaust gas, an inner case on which a humidifying membrane is arranged and fixing parts for fixing the humidifying membrane on one side and the other side of the inner case, a cartridge disposed inside the intermediate case, a bypass channel formed between the inner wall of the intermediate case and the outer side of the inner case, and a baffle disposed in the internal space of the intermediate case and partitioning the bypass channel, the baffle being provided with a moving hole through which fluid moves.

Description

Technical Field

[0001] The present invention relates to a humidifier for a fuel cell having a bypass type baffle. More specifically, the present invention relates to a humidifier for a fuel cell having a bypass type baffle that reduces differential pressure by bypassing exhaust gas through a bypass flow path and increases the effective area of a humidification membrane by diversifying a fluid movement path through the baffle.

Background Art

[0002] A fuel cell is a power generation type battery that combines hydrogen and oxygen to produce electricity. Unlike general chemical batteries such as dry batteries and storage batteries, a fuel cell continuously produces electricity as long as hydrogen and oxygen are supplied, and has the advantage of being about twice as efficient as an internal combustion engine because there is no heat loss. A fuel cell system includes a stack that is an aggregate of electric power generation of unit fuel cells composed of an air electrode and a fuel electrode, an air supply device for supplying air to the air electrode of the fuel cell, and a hydrogen supply device for supplying hydrogen to the fuel electrode of the fuel cell. In a polymer fuel cell of a fuel cell system, appropriate moisture is required for the ion exchange membrane of the membrane electrode assembly (MEA) to function smoothly. For this reason, the air supply device of the fuel cell system is provided with a humidifier for humidifying the air supplied to the fuel cell. The humidifier humidifies the dry gas supplied through the air compressor of the air supply device using the moisture of the high-temperature and high-humidity exhaust gas discharged from the air electrode of the fuel cell, and supplies the humidified air to the air electrode of the fuel cell. The humidifier of the fuel cell uses a membrane humidification method. The humidifier using the membrane humidification method performs membrane humidification through a gas-to-gas moisture exchange method between the high-temperature and high-humidity exhaust gas discharged from the air electrode of the fuel cell and the dry gas supplied through the air compressor. The humidifier of the fuel cell includes a cartridge in which a humidification membrane made of a hollow fiber membrane is arranged as a unit module. Dry gas passes through the inside of the hollow fiber membrane through one side and the other side of the cartridge, and an opening (window) that is open to the outside is provided on the side surface of the cartridge. Exhaust gas flows into the cartridge through the opening, and the exhaust gas that flows into the cartridge exchanges moisture with dry gas passing through the hollow fiber membrane. However, such cartridges have the following problems. Generally, the openings on the side of the cartridge are formed where the exhaust gas enters, but the flow rate concentrates and the flow velocity increases at the point where the exhaust gas enters, which can damage the humidifying membrane and reduce its durability. Furthermore, because the path of the exhaust gas moving inside the cartridge is predetermined, the membrane will not be used uniformly in sections where the exhaust gas flow path inside the cartridge has not yet been formed. This results in a decrease in the effective membrane area, a reduction in humidification efficiency, and an increase in differential pressure. [Overview of the project] [Problems that the invention aims to solve]

[0003] The present invention aims to solve the aforementioned problems, and more specifically, relates to a fuel cell humidifier equipped with a bypass-type baffle that reduces exhaust gas flow by bypassing it through a bypass channel and increases the effective area of ​​the humidifying membrane by diversifying the fluid flow path through the baffle. [Means for solving the problem]

[0004] The fuel cell humidifier equipped with the bypass-type baffle of the present invention, as described above, is a fuel cell humidifier, comprising: an intermediate case having an exhaust gas inlet into which exhaust gas discharged from a fuel cell stack flows and an exhaust gas outlet for discharging the exhaust gas; an inner case on which a humidifying membrane is arranged; a cartridge disposed inside the intermediate case, which includes fixing parts for fixing the humidifying membrane on one side and the other side of the inner case; a bypass channel formed between the inner wall of the intermediate case and the outer side of the inner case; and a baffle disposed in the internal space of the intermediate case and partitioning the bypass channel, wherein the baffle is provided with a moving hole through which fluid moves. The side surface of the inner case of the fuel cell humidifier equipped with the bypass-type baffle of the present invention described above has an opening that is continuous with the other side of the inner case on one side of the inner case. The bypass channel of the fuel cell humidifier equipped with the bypass-type baffle of the present invention described above includes a first bypass channel formed between the upper inner wall of the intermediate case and the upper outer side of the inner case, and a second bypass channel formed between the lower inner wall of the intermediate case and the lower outer side of the inner case. The baffle is plate-shaped and separates the first bypass channel and the second bypass channel, and the movable hole of the baffle is provided at the point where the first bypass channel or the second bypass channel is formed. The baffle of the fuel cell humidifier equipped with the bypass-type baffle of the present invention described above is made of a plate shape and has a mounting hole inside into which the inner case is inserted, and the movable hole is provided above or below the mounting hole. The baffle of the fuel cell humidifier equipped with the bypass-type baffle of the present invention described above includes a first baffle having the movable hole only above the mounting hole and a second baffle having the movable hole only below the mounting hole, and the first baffle and the second baffle can be arranged in the internal space of the intermediate case. In the internal space of the intermediate case of the fuel cell humidifier equipped with the bypass-type baffle of the present invention described above, the first baffle and the second baffle may be arranged alternately. The baffle of the fuel cell humidifier equipped with the bypass-type baffle of the present invention described above includes a first baffle having the movable hole only at the upper part of the mounting hole, a plurality of the first baffles are arranged in the internal space of the intermediate case, the first bypass flow path is open, and the second bypass flow path is closed. The baffle of the fuel cell humidifier equipped with the bypass-type baffle of the present invention described above includes a second baffle having the movable hole only at the lower part of the mounting hole, a plurality of the second baffles are arranged in the internal space of the intermediate case, the second bypass flow path is open, and the first bypass flow path is closed. [Effects of the Invention]

[0005] The present invention relates to a fuel cell humidifier equipped with a bypass-type baffle, which has the advantage of reducing noise by constantly forming a bypass flow path between the inner case of the cartridge and the inner wall of the intermediate case, thereby bypassing the exhaust gas. Furthermore, the present invention has the advantage of increasing the effective area of ​​the humidifying membrane by diversifying the fluid movement path through baffles that partition the bypass flow path, thereby improving humidification efficiency and reducing differential pressure. [Brief explanation of the drawing]

[0006] [Figure 1] This is an exploded perspective view of a fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention. [Figure 2] This drawing shows how a cartridge according to an embodiment of the present invention is mounted in an intermediate case. [Figure 3] This is a drawing showing a cartridge with an opening along the entire side of the inner case, according to an embodiment of the present invention. [Figure 4] This diagram shows an embodiment of the present invention in which a first baffle and a second baffle are alternately arranged inside an intermediate case to change the exhaust gas flow path. [Figure 5] This diagram shows an embodiment of the present invention in which only the first baffle is placed inside the intermediate case, the first bypass channel is left open, and the second bypass channel is closed. [Figure 6] This diagram shows an embodiment of the present invention in which only the second baffle is placed inside the intermediate case, the second bypass channel is left open, and the first bypass channel is closed. [Modes for carrying out the invention]

[0007] This specification clarifies the scope of the invention, explains the principles of the invention, and discloses embodiments so that a person with ordinary skill in the art to which the invention pertains can carry out the invention. The disclosed embodiments can be embodied in a variety of forms. Expressions such as “includes” or “may include” used in the various embodiments of the present invention refer to the existence of the disclosed function, operation, or component, and do not limit one or more additional functions, operations, or components. Furthermore, in the various embodiments of the present invention, terms such as “includes” or “has” specify the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood not to pre-exist to exclude the existence or possibility of adding one or more other features, numbers, steps, operations, components, parts, or combinations thereof. When it is mentioned that one component is “connected” or “joined” with another component, it should be understood that the first component may be directly connected or joined to the other component, but that there may also be other components between the first component and the other component. On the other hand, when it is mentioned that one component is “directly connected” or “directly joined” with another component, it should be understood that there are no other components between the first component and the other component. The terms "first," "second," etc., used herein are used to describe a variety of components, but the components should not be limited by these terms. The terms are used solely for the purpose of distinguishing one component from another. The present invention relates to a fuel cell humidifier equipped with a bypass-type baffle, which reduces exhaust gas flow by bypassing it through a bypass channel and increases the effective area of ​​the humidifying membrane by diversifying the fluid flow path through the baffle. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. A fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention includes an intermediate case 110, a cartridge 130, a bypass channel 150, and a baffle 160. A humidifier according to an embodiment of the present invention can humidify the gas supplied to a fuel cell stack. Referring to Figure 1, the intermediate case 110 is the external housing of the humidifier, and the intermediate case 110 contains a humidifying membrane 132 for humidifying the air.

[0008] The intermediate case 110 is equipped with an exhaust gas inlet 111 and an exhaust gas outlet 112. The intermediate case 110 is equipped with an exhaust gas inlet 111 into which high-temperature, high-humidity exhaust gas discharged from the fuel cell stack flows, and an exhaust gas outlet 112 for discharging the exhaust gas. According to an embodiment of the present invention, an end cap 120 may be coupled to the intermediate case 110. The end cap 120 is coupled to one side and the other side of the intermediate case 110. The end cap 120 is provided with an air inlet 121 for supplying dry air to the intermediate case 110 and an air outlet 122 for discharging humidified air to the intermediate case 110. Specifically, the end cap 120 coupled to one side of the intermediate case 110 is provided with the air outlet 122, and the end cap 120 coupled to the other side of the intermediate case 110 is provided with the air inlet 121. The air outlet 122 is connected to the fuel cell stack, and the humidified air discharged through the air outlet 122 can be supplied to the fuel cell stack. High-temperature, high-humidity exhaust gas discharged from the fuel cell stack can flow into the interior of the intermediate case 110 through the exhaust gas inlet 111 provided in the intermediate case 110. The exhaust gas that flows into the intermediate case 110 supplies moisture to the dry air supplied to the intermediate case 110 through the air inlet 121 of the end cap 120. The exhaust gas, which has been moistened by adding moisture to the dry air, can be discharged to the outside through the exhaust gas outlet 112 provided in the intermediate case 110. The dry air humidified through the intermediate case 110 is discharged through the air outlet 122, and the humidified air is supplied to the fuel cell stack. According to an embodiment of the present invention, the end cap 120 is coupled to one side and the other side of the intermediate case 110, but the end cap 120 may be integrally formed with the intermediate case 110.

[0009] Referring to FIGS. 2 and 3, the cartridge 130 may include an inner case 140 in which a humidification film 132 is disposed and a fixing portion 131 that fixes the humidification film 132 on one side and the other side of the inner case 140. The cartridge 130 may be disposed inside the intermediate case 110. Referring to FIG. 2, the inner case 140 is a case having a space inside, and one or more of the inner cases 140 may be disposed inside the intermediate case 110. The humidification film 132 may be disposed inside the inner case 140. The humidification film 132 is a humidification film that exchanges moisture between exhaust gas and dry air, and one or more or a plurality of the humidification films 132 are provided inside the inner case 140. According to an embodiment of the present invention, the humidification film 132 is made of a hollow fiber membrane. However, it is not limited thereto, and the humidification film 132 may be made of various types of humidification films as long as it exchanges moisture between exhaust gas and dry air. The fixing portion 131 is for fixing the humidification film 132 to the inner case 140 on one side of the inner case 140, and the fixing portion 131 is made of a potting layer. The fixing portion 131 is formed on one side of the plurality of humidification films 132, and one side of the plurality of humidification films 132 can be fixed to one side of the inner case 140 through the fixing portion 131. Also, the fixing portion 131 may fix the plurality of humidification films 132 to the inner case 140 on the other side of the inner case 140. The fixing portion 131 is also formed on the other side of the plurality of humidification films 132, and the other side of the plurality of humidification films 132 can be fixed to the other side of the inner case 140 through the fixing portion 131. The fixing part 131 separates the internal space of the inner case 140. By providing the fixing part 131 on one side and the other side of the inner case 140, dry air moves only through the inside of the humidifying film 132 or through the hollow of the humidifying film 132. The fuel cell humidifier with a bypass type baffle according to an embodiment of the present invention may further include a packing member 133. Referring to FIG. 1, the packing member 133 is sandwiched between the cartridge 130 and the intermediate case 110 so as to seal between the cartridge 130 and the intermediate case 110.

[0010] The packing member 133 can prevent the dry air supplied through the end cap 120 and the exhaust gas supplied to the intermediate case 110 from being directly mixed. Referring to FIG. 1, the packing member 133 is provided on one side and the other side of the cartridge 130, and can partition and isolate the point where dry air flows in and is discharged and the point where exhaust gas flows in and is discharged. By partitioning the point where dry air flows in and is discharged and the point where exhaust gas flows in and is discharged through the packing member 133, it is possible to prevent the dry air supplied through the end cap 120 and the exhaust gas supplied to the intermediate case 110 from being directly mixed. The packing member 133 is made of a rubber member, but is not limited thereto, and the packing member 133 may include various members. If the packing member 133 includes a soft member, a hard member, it may also include a metal member. Referring to FIG. 3, on the side surface of the inner case 140 according to an embodiment of the present invention, an opening 134 (window) is provided continuously along the other side of the inner case 140 on one side of the inner case 140. The opening 134 is a portion open to the outside, and exhaust gas can flow into the inside of the cartridge 130 through the opening 134. The openings 134 are provided only on one side and the other side of the inner case 140. However, in this case, the inflow of exhaust gas is concentrated at the openings 134 provided on one side and the other side of the inner case 140, which increases the flow velocity at the openings 134 and can damage the humidifying membrane. In an embodiment of the present invention, a fuel cell humidifier equipped with a bypass-type baffle is provided with an opening 134 (window) on one side of the inner case 140, continuously along the other side of the inner case 140, in order to prevent such problems. That is, the opening 134 is provided across the entire side surface of the inner case 140.

[0011] In this way, by providing the opening 134 along the entire side surface of the inner case 140, it is possible to prevent the flow rate from concentrating at a specific opening 134 and the flow velocity from increasing. When the opening 134 is provided along the entire side surface of the inner case 140, the humidification efficiency can be improved by allowing exhaust gas to flow into various points of the opening 134. For this purpose, a fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention may be equipped with the bypass flow path 150 and the baffle 160. Referring to Figure 4, the bypass passage 150 may be formed between the inner wall of the intermediate case 110 and the outer side of the inner case 140. The bypass passage 150 is a passage formed between the inner wall of the intermediate case 110 and the outer side of the inner case 140, and exhaust gas can move to the outside of the cartridge 130 through the bypass passage 150. The bypass passage 150 is a permanent bypass passage formed between the inner case 140 and the inner wall of the intermediate case 110 of the cartridge 130, and exhaust gas can be bypassed through the bypass passage 150. A fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention can reduce stress by forming the bypass flow path 150 and bypassing the exhaust gas. According to embodiments of the present invention, the bypass channel 150 may include a first bypass channel 151 formed between the upper inner wall 113 of the intermediate case 110 and the outer part of the upper part 141 of the inner case 140, and a second bypass channel 152 formed between the lower inner wall 114 of the intermediate case 110 and the outer part of the lower part 142 of the inner case 140. Here, the upper inner wall 113 of the intermediate case 110 is an inner wall provided at the top of the intermediate case 110 with reference to Figure 4, and the lower inner wall 114 of the intermediate case 110 is an inner wall provided at the bottom of the intermediate case 110 with reference to Figure 4. Furthermore, the upper part 141 of the inner case 140 is the upper part of the inner case 140 with reference to Figure 4, and the lower part 142 of the inner case 140 is the lower part of the inner case 140 with reference to Figure 4. The side surface 143 of the inner case 140 is a surface formed between the upper part 141 and the lower part 142 of the inner case 140, with reference to Figure 4, and the opening 134 is provided across the entire side surface 143 of the inner case 140. Referring to Figure 4, the baffle 160 is arranged in the internal space of the intermediate case 110 and partitions the bypass flow path 150. The baffle 160 is made of a plate shape and is installed inside the intermediate case 110, and the bypass flow path 150 can be partitioned through the plate-shaped baffle 160. Referring to Figure 4, the baffle 160 is provided with a moving hole 161 through which the fluid can move. The moving hole 161 is a hole that penetrates the baffle 160.

[0012] The baffle 160 may include points with the movable holes 161 and points without the movable holes 161. Fluid moves through the points with the movable holes 161 in the baffle 160, and no fluid moves in the points without the movable holes 161 in the baffle 160. When partitioning the bypass channel 150 through the baffle 160, the fluid's path can be changed and the fluid's movement path diversified by changing the location of the movable hole 161. Specifically, by partitioning the bypass passage 150 through the baffle 160 and changing the location of the movable hole 161, the path through which the exhaust gas travels between the bypass passage 150 and the opening 134 can be changed. Referring to Figure 4, the baffle 160 according to the embodiment of the present invention is provided with a mounting hole 162 into which the inner case 140 is inserted. The mounting hole 162 is a hole that penetrates the baffle 160, and the inner case 140 can be inserted into the mounting hole 162. When the baffle 160 is placed inside the intermediate case 110, the baffle 160 can be positioned such that the inner case 140 is inserted through the mounting hole 162 of the baffle 160. According to embodiments of the present invention, the movable hole 161 of the baffle 160 is provided above or below the mounting hole 162. The movable hole 161 of the baffle 160 is selectively provided above or below the mounting hole 162. If necessary, the movable hole 161 is provided above and below both the mounting hole 162. Referring to Figure 4, a plurality of the baffles 160 are arranged inside the intermediate case 110, and the baffles 160 can partition the first bypass channel 151 and the second bypass channel 152. The movable hole 161 of the baffle 160 is provided at the location where the first bypass channel 151 or the second bypass channel 152 is formed, and through it the path of the fluid passing through the first bypass channel 151 and the second bypass channel 152 can be changed. According to embodiments of the present invention, the baffle 160 may include a first baffle 171 having the movable hole 161 only in the upper part of the mounting hole 162 and a second baffle 172 having the movable hole 161 only in the lower part of the mounting hole 162.

[0013] By separating the first bypass channel 151 and the second bypass channel 152 through the first baffle 171, which has the movable hole 161 only at the top of the mounting hole 162, the first bypass channel 151 becomes a state in which fluid can move through the movable hole 161, while the second bypass channel 152 becomes a state in which fluid cannot move. By separating the first bypass passage 151 and the second bypass passage 152 through the second baffle 172, which has the movable hole 161 only at the lower part of the mounting hole 162, the second bypass passage 152 becomes a state in which fluid can move through the movable hole 161, while the first bypass passage 151 becomes a state in which fluid cannot move. Multiple baffles 160 are arranged in the internal space of the intermediate case 110, and one or more first baffles 171 and one or more second baffles 172 may be arranged in the internal space of the intermediate case 110. By arranging the first baffles 171 and the second baffles 172 in the internal space of the intermediate case 110, the exhaust gas movement paths can be diversified. Referring to Figure 4, in the internal space of the intermediate case 110 according to the embodiment of the present invention, the first baffle 171 and the second baffle 172 can be arranged alternately. If the first baffle 171 and the second baffle 172 are alternately arranged inside the intermediate case 110, as shown in Figure 4, the exhaust gas flowing in through the exhaust gas inlet 111 will alternately move along the upper and lower parts of the outside of the cartridge 130 through the first bypass passage 151 and the second bypass passage 152. As the exhaust gas moves alternately between the upper and lower parts of the outside of the cartridge 130 through the first bypass passage 151 and the second bypass passage 152, the opening 134 is provided along the entire side surface of the inner case 140, allowing exhaust gas to flow in along the entire side surface of the inner case 140. By allowing exhaust gas to flow through the entire side surface of the inner case 140 via the first baffle 171, the second baffle 172, the first bypass channel 151, and the second bypass channel 152, the effective area of ​​the humidifying membrane 132 can be increased. This improves the humidification efficiency of the fuel cell humidifier and reduces the load difference. In other words, a fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention uses the inner case 140 having the opening 134 along its entire side surface, and by changing the movement path of the exhaust gas moving through the first bypass passage 151 and the second bypass passage 152 via the first baffle 171 and the second baffle 172, the effective area of ​​the humidifying membrane 132 can be increased and the humidification efficiency can be improved.

[0014] In the internal space of the intermediate case 110 of the fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention, a plurality of first baffles 171, each having a movable hole 161 only above the mounting hole 162, may be arranged. Referring to Figure 5, multiple first baffles 171 are arranged in the internal space of the intermediate case 110, allowing the first bypass channel 151 to be opened and the second bypass channel 152 to be closed. Furthermore, in the internal space of the intermediate case 110 of a fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention, a plurality of second baffles 172, each having a movable hole 161 only below the mounting hole 162, may be arranged. Referring to Figure 6, multiple second baffles 172 are arranged in the internal space of the intermediate case 110, allowing the second bypass channel 152 to be opened and the first bypass channel 151 to be closed. A fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention can change the path of the exhaust gas moving through the first bypass passage 151 and the second bypass passage 152 depending on the position and shape of the exhaust gas inlet 111 and the exhaust gas outlet 112, and the oil pressure of the exhaust gas. In the fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention, as shown in Figure 5, the exhaust gas can be moved through the first bypass passage 151 formed in the upper part of the inner case 140 by opening the first bypass passage 151 through the first baffle 171 and closing the second bypass passage 152. Furthermore, in a fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention, as shown in Figure 6, the exhaust gas may be moved through the second bypass passage 152 formed in the lower part of the inner case 140 by opening the second bypass passage 152 through the second baffle 172 and closing the first bypass passage 151. The fuel cell humidifier equipped with a bypass-type baffle according to the embodiment of the present invention described above has the following effects. A fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention has the advantage of reducing stress by constantly forming a bypass flow path between the inner case of the cartridge and the inner wall of the intermediate case, thereby bypassing the exhaust gas.

[0015] Furthermore, a fuel cell humidifier equipped with a bypass-type baffle according to an embodiment of the present invention has the advantage of increasing the effective area of ​​the humidifying membrane by diversifying the fluid movement path through the baffle that partitions the bypass flow path, thereby improving humidification efficiency while reducing pressure differences. Thus, although the present invention has been described with reference to one embodiment shown in the drawings, this is merely illustrative, and a person with ordinary skill in the art will understand that a variety of modifications and variations of embodiments are possible. Therefore, the true scope of technical protection of the present invention must be determined by the technical idea of ​​the appended claims.

Claims

1. In a humidifier for fuel cells, An intermediate case having an exhaust gas inlet into which exhaust gas discharged from the fuel cell stack flows, and an exhaust gas outlet for discharging the said exhaust gas, A cartridge is disposed inside the intermediate case, which includes an inner case in which a humidifying membrane is placed, and fixing parts that secure the humidifying membrane on one side and the other side of the inner case. A bypass channel formed between the inner wall of the intermediate case and the outer surface of the inner case, The intermediate case includes a baffle disposed in the internal space of the intermediate case and partitioning the bypass flow path, A fuel cell humidifier equipped with a bypass-type baffle, characterized in that the baffle has moving holes through which the fluid moves.

2. A fuel cell humidifier equipped with a bypass-type baffle according to claim 1, characterized in that the side surface of the inner case has an opening that is continuous with the other side of the inner case on one side of the inner case.

3. The aforementioned bypass channel is It includes a first bypass channel formed between the upper inner wall of the intermediate case and the upper outer side of the inner case, and a second bypass channel formed between the lower inner wall of the intermediate case and the lower outer side of the inner case. The baffle is made of a plate shape and separates the first bypass channel and the second bypass channel. A fuel cell humidifier equipped with a bypass-type baffle according to claim 1, characterized in that the movable hole of the baffle is provided at a point where the first bypass channel or the second bypass channel is formed.

4. The baffle is made of a plate shape and has a mounting hole inside into which the inner case is inserted. A fuel cell humidifier equipped with a bypass-type baffle according to claim 3, characterized in that the movable hole is provided above or below the mounting hole.

5. The baffle includes a first baffle having the movable hole only at the upper part of the mounting hole, and a second baffle having the movable hole only at the lower part of the mounting hole. A fuel cell humidifier equipped with a bypass-type baffle according to claim 4, characterized in that the first baffle and the second baffle are arranged in the internal space of the intermediate case.

6. A fuel cell humidifier equipped with a bypass-type baffle according to claim 5, characterized in that the first baffle and the second baffle are alternately arranged in the internal space of the intermediate case.

7. The baffle includes a first baffle having the movable hole only at the upper part of the mounting hole, A fuel cell humidifier equipped with a bypass-type baffle according to claim 4, characterized in that a plurality of the first baffles are arranged in the internal space of the intermediate case, the first bypass channel is open, and the second bypass channel is closed.

8. The baffle includes a second baffle having the movable hole only at the lower part of the mounting hole, A fuel cell humidifier equipped with a bypass-type baffle according to claim 4, characterized in that a plurality of the second baffles are arranged in the internal space of the intermediate case, the second bypass channel is open, and the first bypass channel is closed.

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