Water separation unit, fuel gas supply system, and fuel cell system

Abstract

The utility model relates to a water separation unit used for a fuel cell system, a fuel gas supply system used for the fuel cell system and the fuel cell system, the water separation unit comprises a first water separation part, a second water separation part and a third water separation part, the first water separation part is configured to receive recirculation flow from the output end of the anode side of a fuel cell stack of the fuel cell system, and causing the recycle stream to helically move about a first axis at a first diameter to remove a first portion of the product water from the recycle stream by means of centrifugal force of the recycle stream in the helically moving; and a second water separation member communicating to the first water separation member and including one or more baffles extending perpendicular to the first axis and configured to receive a recycle stream from the first water separation member from which the first portion of product water is removed, the one or more baffles are arranged to remove a second portion of the product water from the recycle stream from which the first portion of the product water is removed by means of the blocking effect of the one or more baffles. According to the utility model, more product water can be removed from the recycle flow.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell system field especially, it is used for fuel cell system's water separation unit, it is used for fuel cell system's fuel gas supply system and fuel cell system. BACKGROUND

[0002] Fuel cell systems that generate electricity using electrochemical reactions of fuel gas and oxidizing gas are increasingly being used to provide electric power, particularly in the field of electric vehicles. During operation of the fuel cell system, excess fuel gas is typically provided to the input end on the anode side to ensure that all cells in the fuel cell stack have sufficient fuel gas available. Product water, unspent fuel gas (e.g., hydrogen), and ineffective gas (i.e., gas that does not participate in the reaction, primarily nitrogen) accumulate at the output end on the anode side. The unspent fuel gas is typically recirculated back to the fuel gas supply device to be mixed with the fuel gas from the fuel source and supplied again to the fuel cell stack, thereby improving the operating efficiency of the fuel cell system. However, prior to this, the product water needs to be removed from the recirculation stream, which includes product water, unspent fuel gas, and ineffective gas, to increase the concentration of fuel gas in the recirculation stream and prevent water blockage from occurring within the flow field channels of the fuel cell stack or the fuel gas supply device, thereby preventing the fuel cell system from decreasing in efficiency or malfunctioning. SUMMARY

[0003] The utility model provides an improved water separation unit for a fuel cell system, a fuel gas supply system for a fuel cell system, and a fuel cell system to efficiently remove product water from a recirculation stream.

[0004] According to one aspect of the utility model, a water separation unit for a fuel cell system is provided, the water separation unit comprising: a first water separation component configured to receive a recirculation stream from an output end on an anode side of a fuel cell stack of the fuel cell system and to induce the recirculation stream to spiral around a first axis with a first diameter to remove a first portion of product water from the recirculation stream by means of centrifugal force of the recirculation stream in the spiraling motion; and a second water separation component in communication with the first water separation component and comprising one or more baffles extending perpendicular to the first axis, the second water separation component being configured to receive the recirculation stream with the removed first portion of product water from the first water separation component to remove a second portion of product water from the recirculation stream with the removed first portion of product water by means of a blocking effect of the one or more baffles.

[0005] Optionally, the first water separation component comprises: a first housing having a first inlet extending along a second axis perpendicular to the first axis and a first channel and a first outlet extending along the first axis, the first channel being located between the first inlet and the first outlet; and a core component arranged in the first channel, and an outer periphery of the core component having vanes extending helically around the first axis at a first diameter for forming a helical fluid path, the recirculating flow entering the helical fluid path tangentially via the first inlet and undergoing helical motion, and then the recirculating flow entering the first outlet in the helical motion, and the first portion of product water rotating at a second diameter greater than the first diameter after exiting the first outlet.

[0006] Optionally, a diameter of the first outlet is gradually enlarged away from the first channel along the first axis.

[0007] Optionally, the second water separation component comprises: a second housing defining a second inlet, a second outlet and a second channel extending along the first axis, the second channel being located between the second inlet and the second outlet; and the one or more baffles arranged in the second channel.

[0008] Optionally, the first housing comprises a first outlet housing segment defining the first outlet and a convex ring arranged around an outer periphery of the first outlet housing segment, and the second housing comprises a second inlet housing segment defining the second inlet, wherein the second inlet housing segment is connected to the convex ring such that the first outlet extends into the second inlet and forms an annular recess for receiving the first portion of product water.

[0009] Optionally, a diameter of the first outlet is greater than a diameter of the second channel.

[0010] Optionally, the second water separation component comprises a plurality of baffles, and the plurality of baffles has at least one of the following features: the plurality of baffles are uniformly spaced along the first axis; two of the baffles are diametrically oppositely arranged in the second channel; an area of a projection of each of the baffles on a cross-section of the second channel is at least half of an area of the cross-section of the second channel; an area of overlap of the projections of two of the baffles on the cross-section of the second channel is at least one third of the area of the cross-section of the second channel; the projections of the plurality of baffles on the cross-section of the second channel completely occupy the cross-section of the second channel; each of the baffles has at least one aperture, and the at least one aperture of each of the baffles is not perfectly aligned; and each of the baffles is coated with a hydrophilic material.

[0011] Optionally, the second water separation component comprises one baffle that completely occupies the cross-section of the second channel and has a plurality of apertures, and the one baffle has at least one of the following features: a sum of areas of the plurality of apertures is less than or equal to half of the cross-section of the second channel; and the one baffle is coated with a hydrophilic material.

[0012] According to another aspect of the present application, there is provided a fuel gas supply system for a fuel cell system, the fuel gas supply system comprising: the water separation unit for a fuel cell system described above; and a fuel gas supply device.

[0013] According to yet another aspect of the present application, there is provided a fuel cell system, the fuel cell system comprising: the water separation unit for a fuel cell system described above or the fuel gas supply system for a fuel cell system described above.

[0014] In the present application, the first water separation part is referred to as a centrifugal water separation part, and the second water separation part is referred to as a baffle water separation part. By combining the second water separation part to the first water separation part, more product water can be removed from the recirculation flow. In this way, the fuel gas concentration in the recirculation flow can be increased, and the product water content in the recirculation flow can be reduced, thereby improving the working efficiency and reliability of the fuel cell system.

[0015] Other features of the present application, and their advantages, will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0017] Figure 1 A portion of a fuel cell system to which a water separation unit and a fuel gas supply system according to one embodiment of the present application can be applied is schematically shown.

[0018] Figure 2 is a cross-sectional side view of a water separation unit for a fuel cell system according to one embodiment of the present application.

[0019] Figure 3 is Figure 2 is a bottom view of a plurality of baffles in the water separation unit for a fuel cell system of

[0020] Figure 4 is a cross-sectional side view of a water separation unit for a fuel cell system according to another embodiment of the present application.

[0021] Figure 5 is Figure 4 is a bottom view of one baffle in the water separation unit for a fuel cell system of

[0022] LIST OF REFERENCE NUMERALS

[0023] 1 fuel cell stack

[0024] 3 fuel gas supply system

[0025] 5 anode side

[0026] 7 cathode side

[0027] 8 fuel gas supply device

[0028] 9 fuel source

[0029] 13 input

[0030] 15 output

[0031] 17 recirculation loop

[0032] 20 water separation unit

[0033] 22 first water separation component

[0034] 24 second water separation component

[0035] 25 one baffle

[0036] 25a first baffle

[0037] 25b second baffle

[0038] 25c third baffle

[0039] 25d fourth baffle

[0040] 27 hydrogen separation unit

[0041] 29 first housing

[0042] 29a first inlet housing segment

[0043] 29b first passage housing segment

[0044] 29c first outlet housing segment

[0045] 31 first inlet

[0046] 33 first outlet

[0047] 35 core component

[0048] 37 assembly

[0049] 39 vane

[0050] 41 second housing

[0051] 41a second inlet housing segment

[0052] 41b second passage housing segment

[0053] 43 second inlet

[0054] 45 second passage

[0055] 47 convex ring

[0056] 48 drain

[0057] L1 first axis

[0058] L2 second axis DETAILED DESCRIPTION

[0059] Some preferred embodiments of the present application will be described in detail below with reference to examples. It should be understood by those skilled in the art that these embodiments are merely exemplary and do not mean to limit the present application in any manner. Furthermore, features in embodiments of the present application can be combined with each other without conflict, if possible. In the drawings, other components are omitted for simplicity, but this does not mean that the water separation unit for a fuel cell system, the fuel gas supply system for a fuel cell system, and the fuel cell system according to the present application cannot include other components. It should be understood that the size, the proportional relationship of the components, and the number of the components in the drawings are not limiting to the present application.

[0060] A fuel cell system (for example, a proton exchange membrane fuel cell (PEMFC)) can be used in a vehicle to provide electric power to drive a vehicle motor to provide power or to cause on-board systems to perform various functions. Figure 1 A portion of a fuel cell system to which a water separation unit 20 and a fuel gas supply system according to an embodiment of the present application can be applied is schematically shown. Figure 1 The shown portion of the fuel cell system includes a fuel cell stack 1 and a fuel gas supply system 3 (as schematically indicated by the dotted box in Figure 1 The fuel cell stack 1 includes an anode side 5 and a cathode side 7. Fuel gas (for example, hydrogen gas) from a fuel source 9 (as indicated by arrow 11) is supplied to an input end 13 of the anode side 5 by a fuel gas supply device 8 (for example, an ejector) of the fuel gas supply system 3. Generally, excess fuel gas is provided to the input end 13 of the anode side 5 to ensure that all of the cells in the fuel cell stack 1 have sufficient fuel gas available. During operation of the fuel cell system, product water, unspent fuel gas, and off-gas accumulate at an output end 15 of the anode side 5. Off-gas refers to gas that does not participate in the reaction, mainly nitrogen.

[0061] Continuing with reference to Figure 1, the recirculation loop 17 of the fuel gas supply system 3 can be provided between the output end 15 of the anode side 5 and the fuel gas supply device 8 to enable the non-consumed fuel gas to be recirculated back to the fuel gas supply device 8. The water separation unit 20 is provided in the recirculation loop 17 and is in communication with the output end 15 of the anode side 5 to receive a recirculation flow (i.e. a fluid mixture comprising product water, non-consumed fuel gas and off-gas, as indicated by arrow 21) from the output end 15 of the anode side 5 of the fuel cell stack 1 and is capable of removing product water from the recirculation flow as the recirculation flow flows through the water separation unit 20. As will be described in detail hereinafter with reference to the accompanying drawings, the water separation unit 20 comprises a first water separation component 22 configured to receive the recirculation flow from the output end 15 of the anode side 5 of the fuel cell stack 1 of the fuel cell system and to induce a spiral motion of the recirculation flow to remove a first portion of product water from the recirculation flow by means of centrifugal force of the recirculation flow in the spiral motion, and a second water separation component 24 in communication with the first water separation component 22 and comprising one or more baffles 25, 25a, 25b, 25c, 25d, and the second water separation component 24 is configured to receive the recirculation flow from which the first portion of product water is removed from the first water separation component 22 to remove a second portion of product water from the recirculation flow from which the first portion of product water is removed by means of a blocking action of the one or more baffles 25, 25a, 25b, 25c, 25d. Figures 2 to 5 As will be described in detail hereinafter with reference to the accompanying drawings, the water separation unit 20 comprises a first water separation component 22 configured to receive the recirculation flow from the output end 15 of the anode side 5 of the fuel cell stack 1 of the fuel cell system and to induce a spiral motion of the recirculation flow to remove a first portion of product water from the recirculation flow by means of centrifugal force of the recirculation flow in the spiral motion, and a second water separation component 24 in communication with the first water separation component 22 and comprising one or more baffles 25, 25a, 25b, 25c, 25d, and the second water separation component 24 is configured to receive the recirculation flow from which the first portion of product water is removed from the first water separation component 22 to remove a second portion of product water from the recirculation flow from which the first portion of product water is removed by means of a blocking action of the one or more baffles 25, 25a, 25b, 25c, 25d.

[0062] Here, the first water separation component 22 is referred to as a centrifugal water separation component, and the second water separation component 24 is referred to as a baffle water separation component, and it can be seen that the working principle of the first water separation component 22 is different from the working principle of the second water separation component 24, and in general but not absolutely, the weight ratio of the first portion of product water in the recirculation flow is greater than the weight ratio of the second portion of product water in the recirculation flow, and by combining the second water separation component 24 to the first water separation component 22, more product water can be removed from the recirculation flow. In this way, the fuel gas concentration in the recirculation flow can be increased and the product water content in the recirculation flow can be reduced, thereby improving the working efficiency and reliability of the fuel cell system.

[0063] Returning to Figure 1 The recirculation loop 17 further comprises a hydrogen separation unit 27 configured to physically separate at least a portion of hydrogen from the recirculation flow as the recirculation flow flows through the hydrogen separation unit 27 to allow the separated hydrogen to flow towards the fuel gas supply device 8 (as indicated by arrow 23a) and to discharge the remaining components of the recirculation flow except the separated hydrogen out of the fuel cell system (as indicated by arrow 23b).

[0064] The fuel gas supply device 8 can provide a suction force in the recirculation loop 17 for the recirculation flow from the output 15 of the anode side 5 through the water separation unit 20 and the hydrogen separation unit 27 into the fuel gas supply device 8. Alternatively, the recirculation loop 17 can comprise a fuel circulation pump (not shown) arranged between the hydrogen separation unit 27 and the fuel gas supply device 8 and supplementing the fuel gas supply device 8 for providing the suction force. In the fuel gas supply device 8, the recirculation flow is mixed with the fuel gas from the fuel source 9 and supplied together to the input 13 of the anode side 5 (as indicated by arrow 19). In this way, a waste of fuel gas can be avoided and the utilization efficiency of the fuel gas can be improved.

[0065] In the following, the water separation unit 20 according to various embodiments of the present application will be described based on Figures 2 to 5 The water separation unit 20 according to various embodiments of the present application will be described in detail.

[0066] Figure 2 The water separation unit 20 according to one embodiment of the present application is schematically shown, wherein the first water separation component 22 comprises a first housing 29 having a first passage extending along a first axis LI and a first outlet 33, and a first inlet 31 extending along a second axis L2 perpendicular to the first axis LI, the first passage being located between the first inlet 31 and the first outlet 33, for example, the first housing 29 comprises a first inlet housing section 29a, a first passage housing section 29b and a first outlet housing section 29c connected in sequence, an inner wall of the first inlet housing section 29a defining the first inlet 31, an inner wall of the first passage housing section 29b defining the first passage, and an inner wall of the first outlet housing section 29c defining the first outlet 33; and a core component 35 arranged in the first passage and having a fitting 37 and a flow guide fin 39 extending helically around the first axis LI at a first diameter on an outer periphery of the core component 35.

[0067] In one aspect, the fitting 37 is mounted on the inner wall of the first passage housing section 29b, for example, the first housing 29 can be manufactured as a first upper housing and a first lower housing based on the mounting position of the fitting 37 so as to facilitate mounting of the stationary core component 35 by snap-on. It can be understood that here, the first inlet housing section 29a, the first passage housing section 29b and the first outlet housing section 29c are distinguished by names based on functional roles, while the first upper housing and the first lower housing are distinguished by names based on manufacturing processes.

[0068] In another aspect, the vanes 39 form a helical fluid path with the inner wall of the first passage housing section 29b, and since the second axis L2 is perpendicular to the first axis LI, the recirculation flow can enter the helical fluid path tangentially via the first inlet 31 and spiral around the first axis LI at a first helical diameter, and then, in the spiral motion, the recirculation flow enters the first outlet 33, wherein a first portion of the product water in the spiral motion has a centrifugal force greater than that of the remaining portion of the recirculation flow, such that the first portion of the product water is more inclined to rotate at a second diameter greater than the first diameter, thereby concentrating against or proximate to the inner wall of the first outlet housing section 29c in the spiral motion. Optionally, the diameter of the first outlet 33 is gradually enlarged away from the first passage along the first axis LI to facilitate the separation of the first portion of the product water from the remaining portion of the recirculation flow.

[0069] With continued reference to Figure 2 , the second water separation component 24 comprises: a second housing 41 having a second inlet 43, a second outlet (not shown), and a second passage 45 extending along the first axis LI between the second inlet 43 and the second outlet, for example, the second housing 41 comprises a second inlet housing section 41a, a second passage housing section 41b, and a second outlet housing section (not shown) connected in sequence, the inner wall of the second inlet housing section 41a defines the second inlet 43, the inner wall of the second passage housing section 41b defines the second passage 45, and the inner wall of the second outlet housing section defines the second outlet; and the one or more baffles 25, 25a, 25b, 25c, 25d are arranged in the second passage 45.

[0070] Optionally, a ledge 47 is arranged around the outer periphery of the first outlet housing section 29c, and the second inlet housing section 41a is connected to the ledge 47, such that the first outlet 33 extends into the second inlet 43 and forms an annular recess 44, that is, the diameter of the second inlet 43 is greater than the diameter of the first outlet 33, the first portion of the product water enters the second inlet 43 immediately after exiting the first outlet 33 and rotates at a second diameter greater than the first diameter, as the speed of the spiral motion of the first portion of the product water gradually decreases, the centrifugal force gradually disappears, and the first portion of the product water eventually falls into the annular recess 44 to be received by the annular recess 44. A drain 48 can be formed on the second inlet housing section 41a and / or the ledge 47 to facilitate the exit of the first portion of the product water from the drain 48.

[0071] Optionally, the diameter of the first outlet 33 is greater than the diameter of the second passage 45 to facilitate the removal of the first portion of the product water.

[0072] Optionally, as Figure 2As shown, the second water separation component 24 can include a plurality of baffles, i.e., a first baffle 25a, a second baffle 25b, a third baffle 25c, and a fourth baffle 25d. For example, the plurality of baffles are evenly spaced along the first axis LI. For example, two of the baffles are diametrically oppositely arranged in the second passage 45, as shown in FIG. 2A, and the first baffle 25a and the second baffle 25b are adjacent to each other, but this is not a must. For example, the area of the projection of each baffle on the cross section of the second passage 45 perpendicular to the first axis LI is at least half of the area of the cross section of the second passage 45, as shown in FIG. 2A. Figure 3 As shown, a portion of the edge of the first baffle 25a is attached to the inner wall of the second passage shell segment 41b, and the remaining edge of the first baffle 25a is spaced apart from the inner wall of the second passage shell segment 41b by a certain distance, and the second baffle 25b is arranged in the same way as rotating the first baffle 25a by 180°, the first baffle 25a and the second baffle 25b are adjacent to each other, but this is not a must. For example, the area of the projection of each baffle on the cross section of the second passage 45 perpendicular to the first axis LI is at least half of the area of the cross section of the second passage 45, as shown in FIG. 2A. Figure 3 As shown, the area of the projection of the first baffle 25a and the second baffle 25b on the cross section of the second passage 45 is greater than half of the area of the cross section of the second passage 45. For example, the area of the projection of the two baffles on the cross section of the second passage 45 overlaps is at least one third of the area of the cross section of the second passage 45, as shown in FIG. 2A. Figure 3 As shown, the area of the projection of the first baffle 25a and the second baffle 25b on the cross section of the second passage 45 overlaps is one third of the area of the cross section of the second passage 45, and the area of the projection of the first baffle 25a and the third baffle 25c on the cross section of the second passage 45 overlaps is greater than one third of the area of the cross section of the second passage 45. For example, the projections of the plurality of baffles on the cross section of the second passage 45 completely occupy the cross section of the second passage 45, as shown in FIG. 2A. Figure 3 As shown, the projections of the first baffle 25a, the second baffle 25b, the third baffle 25c, and the fourth baffle 25d on the cross section of the second passage 45 completely occupy the cross section of the second passage 45. In this case, the plurality of baffles together with the inner wall of the second passage shell segment 41b define a tortuous fluid path, the recirculation flow of the removed first portion of product water can enter the tortuous fluid path via the second inlet 43, and in the process of advancing along the tortuous fluid path to enter the second outlet, the second portion of product water is blocked by the plurality of baffles and remains in the second passage 45, the second portion of product water remaining in the second passage 45 can be further returned to the first water separation component 22 for complete removal.

[0073] Optionally, each baffle has at least one aperture, and the at least one aperture of each baffle is not perfectly aligned, such that the projection of the plurality of baffles onto the cross-section of the second channel 45 completely covers the cross-section of the second channel 45. Here, the at least one aperture may originate from a small hole specially opened on each baffle, or from a certain distance between the edge of one of the baffles and the inner wall of the second channel shell segment 41b.

[0074] Optionally, each baffle may be coated with a hydrophilic material to facilitate the removal of water from the second product.

[0075] Optionally, such as Figure 4 and Figure 5 As shown, the second water separation component 24 may include a single baffle or a baffle 25. For example, the baffle 25 completely occupies the cross-section of the second channel 45 and has multiple pores. For example, the sum of the areas of the multiple pores is less than or equal to half the area of ​​the cross-section of the second channel 45. For example, the baffle 25 may be coated with a hydrophilic material. That is, the recirculated flow of the first portion of product water removed can enter the second channel 45 through the second inlet 43 and is partially blocked in the second channel 45 by the baffle 25 to remove the second portion of product water. Figure 5 In this context, a baffle 25 includes a central aperture 51 and a plurality of peripheral apertures 53 evenly distributed around the central aperture 51, but this is not mandatory, as long as the baffle 25 has at least one of the features listed above.

[0076] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A water separation unit (20) for a fuel cell system, characterized by The water separation unit (20) comprises: a first water separation component (22) configured to receive a recycle stream from an output of an anode side of a fuel cell stack of a fuel cell system and to induce the recycle stream to spiral motion about a first axis (L1) at a first diameter to remove a first portion of product water from the recycle stream by centrifugal force of the recycle stream in the spiral motion; and a second water separation component (24) in communication with the first water separation component (22) and comprising one or more baffles (25, 25a, 25b, 25c, 25d) extending perpendicular to the first axis (L1) and configured to receive the recycle stream of the removed first portion of product water from the first water separation component (22) to remove a second portion of product water from the recycle stream of the removed first portion of product water by a blocking action of the one or more baffles (25, 25a, 25b, 25c, 25d).

2. The water separation unit (20) for a fuel cell system according to claim 1, characterized in that The first water separation component (22) comprises: a first housing (29) having a first inlet (31) extending along a second axis (L2) perpendicular to the first axis (L1) and a first passage and a first outlet (33) extending along the first axis (L1), the first passage being located between the first inlet (31) and the first outlet (33); and a core component (35) arranged in the first passage, an outer periphery of the core component (35) having a vaned portion (39) spirally extending about the first axis (L1) at the first diameter for forming a spiral fluid path, the recycle stream entering the spiral fluid path tangentially via the first inlet (31) and being induced to spiral motion, and then, the recycle stream in the spiral motion enters the first outlet (33) and the first portion of product water is spun at a second diameter greater than the first diameter after exiting the first outlet (33).

3. The water separation unit (20) for a fuel cell system according to claim 2, characterized in that The diameter of the first outlet (33) is gradually enlarged away from the first passage along the first axis (L1).

4. The water separation unit (20) for a fuel cell system according to claim 2, characterized by The second water separation component (24) comprises: a second housing (41) defining a second inlet (43), a second outlet and a second passage (45) extending along the first axis (L1), the second passage (45) being located between the second inlet (43) and the second outlet; and the one or more baffles (25, 25a, 25b, 25c, 25d) are arranged in the second passage (45).

5. The water separation unit (20) for a fuel cell system according to claim 4, characterized in that The first housing (29) comprises a first outlet housing segment (29c) defining the first outlet (33) and a convex ring (47) arranged around an outer periphery of the first outlet housing segment (29c), and the second housing (41) comprises a second inlet housing segment (41a) defining the second inlet (43), wherein the second inlet housing segment (41a) is connected to the convex ring (47) such that the first outlet (33) extends into the second inlet (43) and forms an annular recess (44) for receiving the first portion of product water.

6. The water separation unit (20) for a fuel cell system according to claim 4, characterized by The diameter of the first outlet (33) is greater than the diameter of the second passage (45).

7. The water separation unit (20) for a fuel cell system according to any one of claims 1 to 6, characterized in that The second water separation member (24) includes a plurality of baffles, and the plurality of baffles has at least one of the following features: The plurality of baffles is uniformly spaced along the first axis (L1); Two of the baffles are diametrically oppositely arranged in the second passage (45); Each of the baffles has at least one aperture, and the at least one aperture of each of the baffles is not completely aligned; Each of the baffles is coated with a hydrophilic material. The second water separation member (24) includes one baffle that completely occupies the cross section of the second passage (45) and has a plurality of apertures, and the one baffle has at least one of the following features: The sum of the areas of the plurality of apertures is less than or equal to half of the cross section of the second passage (45); and The one baffle is coated with a hydrophilic material. The fuel gas supply system includes:

8. The water separation unit (20) for a fuel cell system according to any one of claims 1 to 6, characterized in that The water separation unit (20) for a fuel cell system according to any one of claims 1 to 8; and The fuel gas supply device (8). The fuel cell system includes the water separation unit (20) for a fuel cell system according to any one of claims 1 to 8 or the fuel gas supply system for a fuel cell system according to claim 9.

9. A fuel gas supply system for a fuel cell system, characterized in that, The fuel gas supply system includes: The water separation unit (20) for a fuel cell system according to any one of claims 1 to 8; and The fuel gas supply device (8).

10. A fuel cell system characterized by comprising: The fuel cell system includes the water separation unit (20) for a fuel cell system according to any one of claims 1 to 8 or the fuel gas supply system for a fuel cell system according to claim 9.

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