humidifier

Abstract

To provide a humidifier (1) for a fuel cell system equipped with a fuel cell, which humidifies dry air (TL) flowing into a fuel cell with humid air (FL) flowing out of the fuel cell.SOLUTION: A humidifier (1) includes a membrane stack (2) and a housing (4). The humidifier (1) further includes two annular seals (13a, 13b) that are tightly sandwiched between the membrane stack (2) and the housing (4). Each of the seals (13a, 13b) is disposed corresponding to a moist air (FL) side (6a, 6b) of the membrane stack (2).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The invention relates to a humidifier for a fuel cell system for a vehicle equipped with a fuel cell, in particular for a vehicle powered by a fuel cell system, for humidifying dry air entering the fuel cell with moist air leaving the fuel cell according to the preamble of claim 1. The invention also relates to a fuel cell system comprising a fuel cell and a humidifier.

[0002] The humidifier can be used in a fuel cell system with a fuel cell. In this case, the humidifier can humidify the dry air flowing into the fuel cell with the moist air flowing out of the fuel cell. The fuel cell is generally a stack, i.e. a stack of individual fuel cell elements stacked on top of each other. The humidifier generally has a membrane stack with a plurality of membranes stacked and spaced apart in the stacking direction. Dry air and moist air can flow through the membrane stack in a cross-flow without mixing, so that moisture or water vapor can be transferred from the moist air to the dry air through the membranes. In this case, the membrane stack is contained in a housing and sealed to the housing, so that the dry air and moist air can flow into and out of the membrane stack without mixing in the housing.

[0003] As the air flows through the fuel cell system, it continuously loses pressure, so that the pressure in the dry air and, as a result, in the membrane stack is significantly higher than the pressure in the humid air. This causes high forces inside the housing between the areas through which the dry air flows, the membrane stack and the areas through which the humid air flows. In particular, this can cause the membrane stack to deform and, in the worst case, the adhesion of the membranes can be impaired. Correspondingly, the membrane stack must be sufficiently shape-stable, which is associated with additional effort and additional costs during production.

[0004] It is therefore an object of the present invention to provide an improved or at least alternative embodiment for a humidifier of the generic type, which overcomes the above-mentioned disadvantages, and also to provide a corresponding fuel cell system with a humidifier.

[0005] This problem is solved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims.

[0006] The invention is based on the general idea of ​​sealing the membrane stack to the housing on the wet side of the humidifier - a wet-wet seal - thereby avoiding or at least reducing deformation of the membrane stack during operation of the humidifier.

[0007] The humidifier according to the invention is provided or designed for a fuel cell system for a vehicle with a fuel cell. The humidifier according to the invention is provided or designed in particular for a fuel cell system or for a vehicle driven by a fuel cell of a fuel cell system. In particular, the humidifier is provided or designed for humidifying the dry air entering the fuel cell with the moist air leaving the fuel cell. The humidifier has a membrane stack of flat membranes, the membranes being stacked in the membrane stack in a stacking direction spaced apart from one another. The membrane stack has four side faces oriented parallel to the stacking direction and two end faces oriented transversely to the stacking direction. In this case, two opposite side faces are provided or designed for the inflow of moist air into the membrane stack and the outflow of moist air from the membrane stack, and two other opposite side faces are provided or designed for the inflow of dry air into the membrane stack and the outflow of dry air from the membrane stack. The end faces of the membrane stack are airtight. Furthermore, the humidifier has a housing, and the membrane stack is accommodated in the housing, where the humidifier has two annular seals, each of which is tightly sandwiched between the membrane stack and the housing, and each of which is arranged in accordance with the present invention corresponding to the moist air sides and hermetically separates the moist air sides from each other, from the dry air sides and from the end faces in the housing.

[0008] In the context of the present invention, the terms "for dry air" and "in dry air" are used synonymously with the term "dry air side", while the terms "for humid air" and "in humid air" are used synonymously with the term "humid air side".

[0009] In the membrane stack, the membranes are stacked one above the other in the stacking direction. The membranes may in particular be airtight and moisture- or water vapor-permeable, so that moist and dry air cannot flow through the membranes in the membrane stack, but moisture or water vapor can nevertheless be exchanged with one another. The membranes may be rectangular and flexible.

[0010] Between the membranes, channels on the humid air side and channels on the dry air side may be formed, which may be alternated in the stacking direction. The channels on the dry air side and the channels on the humid air side may be arranged transversely to the stacking direction and may flow through in cross-flow. For this purpose, the channels on the dry air side may connect the dry air side of the membrane stack to one another in an air-guiding manner and be separated gas-tight from the side of the membrane stack to the humid air side. Correspondingly, the channels on the humid air side may connect the wet air side of the membrane stack to one another in an air-guiding manner and be separated gas-tight from the side of the membrane stack to the dry air side. The individual adjacent membranes may be glued to one another by two edge adhesive strips, by means of which the channels may also be formed between the membranes. Between the membranes, spacers or so-called spacers may be arranged, which may be glued to the membranes via edge adhesive strips.

[0011] The membrane stack itself may be cuboid-shaped. The sides and ends of the membrane stack may completely form the surface located on the outside of the membrane stack or completely define the membrane stack to the outside. Each seal may be annular and may surround the moist air side of the membrane stack. Each seal may be, for example, elastic.

[0012] During operation of the humidifier, the dry air side is dominated by the pressure prevailing in the dry air or on the dry air side, and the humid air side is dominated by the pressure prevailing in the humid air or on the humid air side. In the membrane stack itself, the areas of dry air pressure and humid air pressure are interchanged. Overall, the resulting pressure in the membrane stack corresponds approximately to the pressure on the dry air side. As the air continuously loses pressure when flowing through the fuel cell system, the pressure on the dry air side is significantly higher than that on the humid air side. For example, the dry air may have a pressure of about 3 bar and the humid air may have a pressure of about 2 bar. Thus, within the housing of the humidifier, a pressure difference of about 1 bar can occur between the individual areas.

[0013] The seals can hermetically separate the humid air side from the dry air side and end face, so that during operation of the humidifier, the dry air pressure prevails at the dry air side and end face inside the housing. This allows comparable pressures to prevail at the end face of the membrane stack inside and outside the membrane stack, and bulging of the membrane stack in the stacking direction or at the end face can be avoided or at least significantly reduced. In other words, this allows force imbalances caused by pressure differences between the inside and outside of the membrane stack to be avoided or at least reduced. This allows damage to the membrane stack to be avoided. Furthermore, the two dry air side faces can be easily hermetically separated from each other, because the pressure is distributed almost uniformly at the dry air side and end face. In particular, due to the almost uniform pressure distribution, the dry air does not flow violently around the membrane stack from one dry air side to the other dry air side. Therefore, the time-consuming and completely airtight sealing of both dry air sides is not required, which reduces the time and cost required to manufacture the humidifier.

[0014] In one possible embodiment of the humidifier, the membrane stack may have two sealing plates. In this case, the sealing plates may be in close contact with the last membrane in the stacking direction and form the end face of the membrane stack. The sealing plates may therefore be part of the membrane stack. The sealing plates may be, for example, molded from plastic and / or may be material-bonded, for example glued, to the last membrane in the stacking direction.

[0015] The membrane stack may be at least partially sealed to the housing at each sealing plate, so that the pressure of the dry air side prevails inside the housing during operation of the humidifier at the side and end face of the dry air side. The membrane stack may be at least partially sealed to the housing at each sealing plate and connected in an air-guiding manner via a bypass, so that the pressure of the dry air side prevails inside the housing during operation of the humidifier at the side and end face of the dry air side. This makes it possible - as already mentioned above - to avoid or at least greatly reduce the bulging of the membrane stack in the stacking direction or at the end face, and to avoid a complex, completely airtight sealing of the two dry air sides together.

[0016] The membrane stack may have two labyrinth seals molded into each sealing plate on the side opposite the membrane, each labyrinth seal being in close contact with the housing and capable of separating the housing into a number of regions at least partially hermetically separated from one another. Alternatively, the membrane stack may have two seals sandwiched between each sealing plate and the housing, each seal being capable of separating the housing into a number of regions at least partially hermetically separated from one another.

[0017] Thus, in the humidifier, the humid air side faces are separated from each other and from the dry air side faces as well as from the end face by two annular seals. In this case, the seal of the humid air side face may be completely airtight. Both dry air side faces may be separated inside the housing by both labyrinth seals or both seals. The seal of the dry air side faces may only be partially airtight, since due to the approximately uniform pressure, the dry air does not flow violently around the membrane stack from one dry air side face to the other dry air side face. This allows a considerable reduction in the effort of sealing the membrane stack in the housing.

[0018] In one possible embodiment of the humidifier, the membrane stack may have two sealing frames. Each sealing frame may abut the edge side of the moist air side and surround these sides. In this case, each sealing frame may be tightly connected to the moist air side and each seal may be sandwiched between the respective sealing frame and the housing. Each sealing frame may be molded, for example, from plastic and / or may be materially connected, for example glued, to the moist air side.

[0019] In this case, one seal may be arranged on one sealing frame and the other seal may be arranged on the other sealing frame, so that each seal is pressed against the housing in opposite directions by each sealing frame, in other words, both seals may be arranged on each sealing frame in a direction away from each wet air side.

[0020] The housing of the humidifier may have two housing parts, a first housing part and a second housing part, which are separate or separated from each other. In this case, each seal may be pressed against a different housing part of the housing by a respective sealing frame. When assembling the humidifier, the membrane stack can be inserted into the first, preferably pot-shaped, housing part in a direction perpendicular to the humid air side or in an insertion direction. In this case, after the insertion of the membrane stack, one seal may be sandwiched between the first housing part and one sealing frame. The second housing part can then be attached to the first housing part, with the membrane stack being sandwiched between both housing parts. The other seal can then be sandwiched between the other sealing frame and the second housing part. In this case, one seal is pressed against the housing in one direction or insertion direction and the other seal in another direction opposite to this direction or opposite to the insertion direction by the correspondingly arranged sealing frames.

[0021] Alternatively, one seal may be arranged on one sealing frame and the other seal on the other sealing frame, so that each seal is pressed against the housing by the respective sealing frame in the same direction or insertion direction. In other words, both seals may be oriented in the same direction or insertion direction in the membrane stack. One seal may be arranged on each sealing frame in a direction away from the correspondingly arranged humid air side surface, and the other seal may be arranged in a direction toward the correspondingly arranged humid air side surface. The humid air side surface and the seal facing it may be arranged, for example, on one side of the sealing frame. In this case, the seals may surround the membrane block and each humid air side surface with a gap therebetween.

[0022] The housing may have two housing parts, a first housing part and a second housing part, which are separate or separated from each other. In this case, the respective seals may be pressed against the same housing part of the housing, for example the first housing part, by the respective sealing frames. When assembling the humidifier, the membrane stack can be inserted into the first, preferably pot-shaped, housing part with an insertion direction perpendicular to the humid air side. In this case, the humidifier is inserted forward into the first housing part with the correspondingly arranged seal facing away from the humid air side. After the insertion of the membrane stack, both seals are located between the first housing part and the respective sealing frames. The second housing part can then be attached to the first housing part, with the membrane stack being sandwiched between the respective housing parts. In this case, both seals are pressed against the first housing part in the insertion direction by the correspondingly arranged sealing frames.

[0023] The invention also relates to a fuel cell system for a vehicle, which comprises a fuel cell and a humidifier as described above. The fuel cell system according to the invention is provided or designed in particular for a fuel cell system or for a vehicle driven by a fuel cell of a fuel cell system. In this case, the humidifier is connected to the fuel cell in an air-guiding manner, so that dry air flowing into the fuel cell and humid air flowing out of the fuel cell can flow through it. In this case, dry air can flow through the dry air side and humid air can flow through the humid air side. The fuel cell system can also have a compressor connected upstream of the humidifier, for example on the dry air side. The dry air can flow into the humidifier immediately after the compressor during operation of the fuel cell system or the humidifier. In the humidifier, the dry air can then be humidified and can subsequently flow into the fuel cell. From the fuel cell, the humid air can then flow into the humidifier and humidify the dry air. The humid air can then flow through a longer distance in the fuel cell system than the dry air and can have a lower pressure than the dry air. In order to avoid repetition, reference is made to the above description in this respect.

[0024] Further important features and advantages of the invention are evident from the subclaims, the drawings and the accompanying description of the drawings based on the drawings.

[0025] It is self-evident that the features mentioned above, and also below, can be used not only in the respective combinations mentioned, but also in other combinations or alone, without departing from the framework of the invention.

[0026] Preferred embodiments of the present invention are illustrated in the drawings and will be explained in more detail in the following description, in which like reference numbers are applied to identical or similar or functionally identical components. [Brief description of the drawings]

[0027] [Figure 1] 1 is a schematic cross-sectional view showing a humidifier according to a first embodiment of the present invention. [Diagram 2] 1 is a schematic diagram of a humidifier according to the invention in a first embodiment with the housing part shown in perspective; FIG. [Diagram 3] 1 is a schematic diagram of a humidifier according to the present invention in a first embodiment, without a housing part; FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view showing a humidifier according to a second embodiment of the present invention.

[0028] In FIG. 1 a cross-sectional view of a humidifier 1 according to the invention in a first embodiment is shown. In FIGS. 2 and 3 different views of a humidifier 1 according to the invention in a first embodiment are shown. The humidifier 1 is provided or designed for a fuel cell system with a fuel cell - not shown here - in order to humidify dry air TL entering the fuel cell with moist air FL leaving the fuel cell. In this case, the humidifier 1 has a membrane stack 2 with a number of flat membranes 3 stacked in a stacking direction ST and a housing 4 with a first housing part 4a and a second housing part 4b. In FIGS. 1 to 3 only some of the membranes 3 are shown for the sake of clarity. In FIG. 2 the second housing part 4b is shown in perspective, in FIG. 3 the second housing part 4b is not shown.

[0029] The membrane stack 2 is shaped like a rectangular parallelepiped and has two flow-through sides 5a and 5b for dry air TL and two flow-through sides 6a and 6b for humid air FL. The membrane stack 2 further has two gas-tight end faces 7a and 7b. The dry air side faces 5a and 5b are located on opposite sides of the membrane stack 2 and are oriented parallel to the stacking direction ST. The humid air side faces 6a and 6b are likewise located on opposite sides of the membrane stack 2 and are oriented parallel to the stacking direction ST. The end faces 7a and 7b are oriented transversely to the stacking direction ST. In this case, the membrane stack 2 has two sealing plates 8a and 8b (see FIG. 2 and FIG. 3 for this), which are in close contact with the last membrane 3 in the stacking direction ST. The sealing plates 8a and 8b are materially connected, for example glued, to the respective membrane 3 and form the end faces 7a and 7b of the membrane stack 2. The sealing plates 8a and 8b have integrally molded labyrinth seals 9a and 9b (see Figures 2 and 3).

[0030] The individual membranes 3 are stacked and bonded to one another in the membrane stack 2, so that dry air TL flows through the membrane stack 2 from side 5a to side 5b, and humid air FL flows through the membrane stack 2 from side 6a to side 6b without cross-flow mixing. In this case, the membranes 3 are moisture- or water vapor-permeable and airtight, so that the dry air TL and the humid air FL can exchange moisture or water vapor through the membranes 3.

[0031] The housing 4 is formed with an inlet 10a and an outlet 10b for dry air TL and an inlet 11a and an outlet 11b for humid air FL. In this case, the inlet 10a on the dry air side is arranged corresponding to the side surface 5a of the dry air side and is connected to the side surface 5a in an air-guiding manner, and the outlet 10b on the dry air side is arranged corresponding to the side surface 5b of the dry air side and is connected to the side surface 5b in an air-guiding manner. Furthermore, the inlet 11a on the humid air side is arranged corresponding to the side surface 6a of the humid air side and is connected to the side surface 6a in an air-guiding manner, and the outlet 11b on the humid air side is arranged corresponding to the side surface 6b of the humid air side and is connected to the side surface 6b in an air-guiding manner.

[0032] The membrane stack 2 further comprises two sealing frames 12a and 12b arranged corresponding to the humid air side faces 6a and 6b. The sealing frames 12a and 12b abut the humid air side faces 6a and 6b in an edge-sealing manner and are, for example, glued to the humid air side faces 6a and 6b. Two annular seals 13a and 13b of the humidifier 1 are further tightly sandwiched between each of the sealing frames 12a and 12b and the housing 4.

[0033] In the first embodiment of the humidifier 1, each seal 13a and 13b is arranged on each sealing frame 12a and 12b in a direction away from each side surface 6a and 6b. The two seals 13a and 13b are thereby tightly pressed by the respective sealing frames 12a and 12b in mutually opposite directions R1 and R2 against the different housing parts 4a and 4b. Thus, when assembling the humidifier 1, the membrane stack 2 together with the seal 13a is first inserted in the direction R1 into the first housing part 4a, whereby the seal 13a can be arranged between the sealing frame 12a and the first housing part 4a. The second housing part 4b is then arranged on the first housing part 4a, whereby the second seal 13b can be arranged between the sealing frame 12b and the second housing part 4b. The first housing part 4a and the second housing part 4b can then be tightly joined to each other, here via the annular seal 14. At the same time, each seal 13a and 13b can be tightly sandwiched or pressed between each sealing frame 12a and 12b and each housing portion 4a and 4b.

[0034] Within the humidifier 1, the moist air sides 6a and 6b are sealed to the housing 4 by seals 13a and 13b, whereby the inlet 11a and outlet 11b are hermetically separated from the inlet 10a and outlet 10b. The labyrinth seals 9a and 9b tightly abut the housing 4 and hermetically or at least partially hermetically separate the inlet 10a and outlet 10b from each other.

[0035] During operation of the humidifier 1, the dry air pressure prevails at the dry air side 5a and 5b, and the wet air pressure prevails at the wet air side 6a and 6b. In the membrane stack 2, the areas of dry air pressure and wet air pressure are interchanged. Overall, the resulting pressure in the membrane stack 2 corresponds approximately to the dry air pressure. Since the wet air side 6a and 6b are hermetically separated from the other areas of the housing 4 by the seals 13a and 13b, the dry air pressure also prevails at the dry air side 5a and 5b and outside the end faces 7a and 7b. Correspondingly, the resulting pressure inside the membrane stack 2 and the pressure outside the membrane stack 2 are approximately equal. This prevents or at least reduces deformations or bulging of the membrane stack 2 at the end faces 7a and 7b.

[0036] Due to the substantially uniform pressure at the dry air side surfaces 5a and 5b and the end surfaces 7a and 7b, the dry air TL does not flow more vigorously around the membrane stack 2 from the dry air side surface 5a to the dry air side surface 5b, so that the labyrinth seals 9a and 9b do not need to completely hermetically separate the dry air side surfaces 5a and 5b from each other. In other words, the labyrinth seals 9a and 9b may bypass the dry air TL around the membrane stack 2. This can reduce the effort in manufacturing the humidifier 1 and the cost of the humidifier 1.

[0037] In Fig. 4, a cross-sectional view of the humidifier 1 according to the invention in a second embodiment is shown. In the second embodiment, the seal 13a is arranged on the sealing frame 12a in a direction away from the humid air side 6a. In contrast, the seal 13b is arranged on the sealing frame 12b in a direction toward the humid air side 6b. In other words, the seal 13b and the side 6b are arranged on one side of the sealing frame 12b. Thus, both seals 13a and 13b are tightly pressed against the first housing part 4a in a common direction R1 by the respective sealing frames 12a and 12b. Thus, when assembling the humidifier 1, the membrane stack 2 together with the seals 13a and 13b is first inserted in the direction R1 into the housing part 4a, so that the seals 13a and 13b can be arranged between the correspondingly arranged respective sealing frames 12a and 12b and the first housing part 4a. The second housing part 4b can then be placed on the first housing part 4a and tightly connected to the second housing part 4b - here via annular seal 14. At the same time, the respective seals 13a and 13b can be tightly sandwiched or pressed between the respective sealing frames 12a and 12b and the first housing part 4a. In other respects, the first and second embodiments of the humidifier 1 correspond. [Explanation of symbols]

[0038] 1 humidifier 2 membrane laminate 3 membrane 4. Housing 4a / 4b housing part 5a / 5b Dry air side 6a / 6b Wet air side 7a / 7b end face 8a / 8b Sealing plate 9a / 9b labyrinth seal 10a / 10b Dry air inlet / outlet 11a / 11b Wet air inlet / outlet 12a / 12b Sealing frame 13a / 13b Seal 14 Seal ST Stacking direction R1 / R2 direction TL Dry Air FL moist air

Claims

1. A humidifier (1) for a fuel cell system for a vehicle equipped with a fuel cell, which humidifies dry air (TL) flowing into a fuel cell with moist air (FL) flowing out of the fuel cell, comprising: The humidifier (1) comprises a membrane stack (2) consisting of a plurality of flat membranes (3), the membranes (3) being stacked in a stacking direction (ST) and spaced apart from one another in the membrane stack (2); The membrane stack (2) has two side surfaces (5a, 5b) located on opposite sides and oriented parallel to the stacking direction (ST) through which the dry air (TL) flows into and out of the membrane stack (2), The membrane stack (2) has two further side surfaces (6a, 6b) located on opposite sides and oriented parallel to the stacking direction (ST) through which the moist air (FL) flows into and out of the membrane stack (2), the membrane stack (2) has two gas-tight end faces (7a, 7b) oriented transversely to the stacking direction (ST), The humidifier (1) has a housing (4), and the membrane laminate (2) is housed in the housing (4); The humidifier (1) has two annular seals (13a, 13b), each of which is tightly sandwiched between the membrane stack (2) and the housing (4); In the humidifier (1), Each of the seals (13a, 13b) is arranged corresponding to one of the sides (6a, 6b) for the humid air (FL) and hermetically separates the sides (6a, 6b) for the humid air (FL) from each other inside the housing (4) and from the sides (5a, 5b) for the dry air (TL) and from the end faces (7a, 7b). A humidifier (1).

2. The humidifier (1) according to claim 1, wherein each of the seals (13a, 13b) hermetically separates each of the sides (6a, 6b) for the humid air (FL) from each of the sides (5a, 5b) for the dry air (TL) and from the end faces (7a, 7b), so that during operation of the humidifier (1), inside the housing (4), a pressure prevailing in the dry air prevails at the sides (5a, 5b) for the dry air (TL) and at the end faces (7a, 7b).

3. 3. The humidifier (1) according to claim 1 or 2, wherein the membrane stack (2) has two sealing plates (8a, 8b), which are in close contact with the last membrane (3) in the stacking direction (ST) and form the end faces (7a, 7b) of the membrane stack (2).

4. the membrane stack (2) is at least partially sealed to the housing (4) at each of the sealing plates (8a, 8b), so that inside the housing (4) during operation of the humidifier (1), a prevailing pressure in the dry air (TL) prevails at the side faces (5a, 5b) and at the end faces (7a, 7b) for the dry air (TL); and / or the membrane stack (2) is at least partially sealed to the housing (4) at each of the sealing plates (8a, 8b) and is connected in an air-guiding manner via a bypass, so that inside the housing (4) during operation of the humidifier (1), a prevailing pressure in the dry air (TL) prevails at the side faces (5a, 5b) and at the end faces (7a, 7b) for the dry air (TL), Humidifier (1) according to claim 3.

5. the membrane stack (2) comprises two labyrinth seals (9a, 9b) molded on each of the sealing plates (8a, 8b) on the side opposite the membrane (3), each of the labyrinth seals (9a, 9b) being in close contact with the housing (4) and separating the housing (4) into a number of regions at least partially hermetically separated from one another, or the membrane stack (2) comprises two seals sandwiched between each of the sealing plates (8a, 8b) and the housing (4), each of which separates the housing (4) into a number of regions at least partially hermetically separated from one another; Humidifier (1) according to claim 3 or 4.

6. The membrane stack (2) has two sealing frames (12a, 12b), each of which abuts against an edge of the side (6a, 6b) for the humid air (FL) and surrounds the side (6a, 6b), each of the sealing frames (12a, 12b) is tightly coupled to the side (6a, 6b) for the humid air (FL), and each of the seals (13a, 13b) is tightly sandwiched between each of the sealing frames (12a, 12b) and the housing (4); Humidifier (1) according to any one of the preceding claims.

7. The humidifier (1) according to claim 6, wherein one of the seals (13a) is arranged in one of the sealing frames (12a) and the other of the seals (13b) is arranged in the other of the sealing frames (12b), whereby each of the seals (13a, 13b) is pressed against the housing (4) in opposite directions (R1, R2) by each of the sealing frames (12a, 12b).

8. The humidifier (1) according to claim 7, characterized in that the housing (4) has two housing parts (4a, 4b) separate from each other, and each of the seals (13a, 13b) is pressed against a different housing part (4a, 4b) of the housing (4) by a respective sealing frame (12a, 12b).

9. The humidifier (1) according to claim 6, wherein one of the seals (13a) is arranged in one of the sealing frames (12a) and the other of the seals (13b) is arranged in the other of the sealing frames (12b), whereby each of the seals (13a, 13b) is pressed against the housing (4) in the same direction (R1) by each of the sealing frames (12a, 12b).

10. 10. The humidifier (1) according to claim 9, wherein the housing (4) has two housing parts (4a, 4b) separate from each other, and each of the seals (13a, 13b) is pressed against the same housing part (4a) of the housing (4) by each of the sealing frames (12a, 12b).

11. The humidifier (1) is connected to the fuel cell in an air guide manner, and allows the dry air (TL) flowing into the fuel cell and the humid air (FL) flowing out of the fuel cell to flow through the humidifier (1); The dry air (TL) can flow through the side surfaces (5a, 5b) for the dry air (TL), and the humid air (FL) can flow through the side surfaces (6a, 6b) for the humid air (FL). A fuel cell system for a vehicle, comprising a fuel cell and a humidifier (1) according to any one of claims 1 to 10.

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