Gas-liquid separation device and hydrogen supply equipment for fuel cells

Abstract

The present application discloses a gas-liquid separation device and hydrogen supply equipment for a fuel cell. The gas-liquid separation device includes a shell, the shell is provided with a first inlet, a first outlet, a second inlet, a second outlet and a water outlet; the shell has a accommodating space inside, the accommodating space is provided with at least one baffle, the accommodating space is divided into a plurality of mutually independent subspaces by at least one baffle, the baffle is provided with through holes, and adjacent subspaces are connected through the through holes; the first inlet is connected to one of the plurality of subspaces, the first outlet is connected to another subspace of the plurality of subspaces; the water outlet is connected to at least one of the plurality of subspaces; the baffle has a new hydrogen flow channel inside, and the second inlet and the second outlet are respectively connected to the new hydrogen flow channel. This scheme can make the gas-liquid separation of waste hydrogen more thorough, and can make the temperature of new hydrogen and waste hydrogen tend to be the same, so that it is not easy to generate liquid water inside the stack, and can avoid flooding of the stack anode.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a gas-liquid separation device and a hydrogen supply device for fuel cells. Background Art

[0002] The anode outlet of the fuel cell contains a large amount of water, which is mixed with hydrogen to form wet hydrogen. If the wet hydrogen enters the battery stack (or fuel cell stack) directly without separation, it will cause the anode of the fuel cell stack to be flooded, so it is necessary to separate the wet hydrogen into gas and liquid.

[0003] At present, a gas-liquid separator is usually used to separate the wet hydrogen into gas and liquid, and the separated hydrogen is recycled. The existing gas-liquid separator can separate most of the liquid water droplets in the wet hydrogen, but it is difficult to separate a small part of the liquid water droplets and gaseous water vapor, and the gas-liquid separation effect is poor. As a result, when the hydrogen after gas-liquid separation is recycled, it is still easy to condense into liquid water inside the fuel cell stack, causing water flooding of the fuel cell anode.

[0004] In addition, the new hydrogen supplied from the hydrogen storage system (with the characteristics of dryness and low temperature), when mixed with the separated hydrogen (with the characteristics of high humidity and high temperature) after treatment by the separator, can easily cause the water vapor in the separated hydrogen to condense and form liquid water, which can also cause flooding of the fuel cell anode. Summary of the invention

[0005] The present application provides a gas-liquid separation device and a hydrogen supply device for a fuel cell to avoid flooding of the anode of the fuel cell stack.

[0006] In the first aspect, the present application provides a gas-liquid separation device for a fuel cell, comprising a shell, the shell being provided with a first inlet, a first outlet, a second inlet, a second outlet and a water outlet. The shell has a accommodating space inside, the accommodating space is provided with at least one baffle, the accommodating space is divided into a plurality of mutually independent subspaces by the at least one baffle, the baffle is provided with a through hole, and the adjacent subspaces are connected through the through hole; the first inlet is connected to one of the plurality of subspaces, the first outlet is connected to another of the plurality of subspaces; the water outlet is connected to at least one of the plurality of subspaces. The baffle has a new hydrogen flow channel inside, and the second inlet and the second outlet are respectively connected to the new hydrogen flow channel.

[0007] In a specific possible implementation manner, when the accommodation space is provided with a plurality of baffles, the through holes on two adjacent baffles are arranged to be staggered with respect to each other in the vertical direction of any one of the baffles.

[0008] In a specific possible implementation manner, in the vertical direction of the baffle, the projection of the through hole is located within the projection range of the new hydrogen flow channel.

[0009] In a specific possible implementation scheme, the baffle includes a first sub-plate and a second sub-plate, and the first sub-plate and the second sub-plate are connected by a rib plate; the first sub-plate is provided with a first through hole, and the second sub-plate is provided with a second through hole, and in the vertical direction of the first sub-plate, the projections of the rib plate, the first through hole and the second through hole coincide with each other, and the rib plate is respectively connected to the first through hole and the second through hole to form the via.

[0010] In a specific embodiment, the shell includes a first side wall and a second side wall, the baffle is connected to the first side wall and the second side wall respectively, the second inlet is arranged on the first side wall, and the second outlet is arranged on the second side wall. The first side wall has a first cavity inside, and the first cavity is connected to the second inlet and the new hydrogen flow channel respectively. The second side wall has a second cavity inside, and the second cavity is connected to the second outlet and the new hydrogen flow channel respectively.

[0011] In a specific possible implementation scheme, the baffle is provided with a notch; when the accommodating space is provided with a plurality of the baffles, among two adjacent baffles, the notch on one baffle is connected to one of the first side wall and the second side wall to form the via hole, and the notch on the other baffle is connected to the other of the first side wall and the second side wall to form the via hole.

[0012] In a specific embodiment, the housing includes a third side wall and a fourth side wall, one of the plurality of subspaces is located between the third side wall and one of the baffles, another of the plurality of subspaces is located between the fourth side wall and one of the baffles, the first inlet is arranged on the third side wall, and the first outlet is arranged on the fourth side wall.

[0013] In a specific implementation scheme, the first side wall and the second side wall are arranged opposite to each other, the third side wall and the fourth side wall are arranged opposite to each other, and the first side wall, the third side wall, the second side wall and the fourth side wall are connected in sequence to form an annular structure. The shell further includes a bottom wall and a top wall, the bottom wall and the top wall are arranged at the bottom and the top of the annular structure respectively, and the bottom wall, the top wall and the annular structure enclose the shell. The water outlet is arranged on the bottom wall.

[0014] In a specific possible implementation manner, a heat dissipation layer is disposed on the baffle, the heat dissipation layer is disposed in the new hydrogen flow channel, and the heat dissipation layer is in contact with the baffle.

[0015] In a second aspect, the present application further provides a hydrogen supply device for a fuel cell, comprising a hydrogen storage system, and a gas-liquid separation device as in any one of the embodiments of the first aspect above. The first inlet is used to connect to a fuel cell to receive hydrogen discharged from the fuel cell. The second inlet is connected to the hydrogen storage system, and the second outlet is used to connect to the fuel cell to supply hydrogen to the fuel cell. The first outlet is used to be connected to the fuel cell in parallel with the second outlet.

[0016] In a specific implementation manner, the second outlet is connected to the fuel cell via a first pipeline, and an ejector is connected to the first pipeline. The first outlet is connected to the first pipeline via a first branch, and the connection between the first branch and the first pipeline is located between the ejector and the fuel cell; the first outlet is connected to the ejector via a second branch.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] The gas-liquid separation device for fuel cells provided in the present application is that the high-humidity and high-temperature hydrogen (waste hydrogen) discharged from the stack enters the first inlet, flows through multiple subspaces separated by the baffle, and separates liquid water on the outer wall of the baffle, thereby realizing gas-liquid separation of the waste hydrogen. The dry low-temperature hydrogen (new hydrogen) supplied by the hydrogen storage system enters the second inlet, flows through the new hydrogen flow channel inside the baffle, and enters the stack from the second outlet; under the influence of the new hydrogen inside the baffle, the waste hydrogen is more likely to separate liquid water on the outer wall of the baffle, making the gas-liquid separation of the waste hydrogen more thorough. After the waste hydrogen (separated hydrogen) that has undergone gas-liquid separation enters the stack from the first outlet, it is not easy to generate liquid water inside the stack, which can avoid flooding of the anode of the stack.

[0019] In addition, the device can achieve thermal interaction between new hydrogen and waste hydrogen. While the new hydrogen cools the waste hydrogen and makes it easier to separate liquid water from the waste hydrogen, the new hydrogen is heated by the waste hydrogen. The temperatures of the new hydrogen and the waste hydrogen tend to be the same, and the temperature difference is small. In this way, after the new hydrogen is mixed with the separated hydrogen, the temperature of the mixed gas is higher than the freezing point of water, which is not enough to produce liquid water inside the fuel cell stack, which can further eliminate the risk of flooding of the fuel cell stack anode. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a gas-liquid separation device for a fuel cell provided by the present application is shown;

[0021] Figure 2 The internal structure schematic diagram of the gas-liquid separation device for a fuel cell provided by the present application is shown;

[0022] Figure 3 A schematic structural diagram of a baffle plate of a gas-liquid separation device for a fuel cell provided by the present application is shown;

[0023] Figure 4 The internal structure schematic diagram of the gas-liquid separation device for a fuel cell provided by the present application is shown;

[0024] Figure 5 A schematic diagram of the three-dimensional structure of a hydrogen supply device for a fuel cell provided in the present application is shown.

[0025] Reference numerals:

[0026] 1-gas-liquid separation device; 2-hydrogen storage system; 3-ejector; 4-first solenoid valve; 5-pump body; 6-second solenoid valve; 7-cell stack;

[0027] 10-shell; 11-first inlet; 12-first outlet; 13-second inlet; 14-second outlet; 15-water outlet; 101-first side wall; 102-second side wall; 103-third side wall; 104-fourth side wall; 105-first cavity; 106-second cavity; 20-baffle; 21-through hole; 22-new hydrogen flow channel; 201-first sub-plate; 202-second sub-plate; 203-rib plate; 30-sub-space. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings. However, the example implementation can be implemented in various forms and should not be construed as being limited to the implementations set forth herein. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted. The words expressing position and direction described in the embodiments of the present application are all described with reference to the accompanying drawings as examples, but changes may be made as needed, and the changes made are all included in the scope of protection of the present application. The drawings of the embodiments of the present application are only used to illustrate the relative position relationship and do not represent the true proportion.

[0029] The following description sets forth specific details to facilitate understanding of the present application, but the embodiments of the present application can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the embodiments of the present application. Therefore, the present application is not limited to the specific implementation methods disclosed below.

[0030] Figure 1 The figure shows a schematic diagram of the three-dimensional structure of the gas-liquid separation device for a fuel cell provided by the present application. Figure 2 The internal structure diagram of the gas-liquid separation device for a fuel cell provided in the present application is shown. The gas-liquid separation device for a fuel cell provided in the embodiment of the present application (hereinafter referred to as "this device") can be applied to a fuel cell group (fuel cell stack). Figure 1As shown, the device may include a housing 10, which is provided with a first inlet 11, a first outlet 12, a second inlet 13, a second outlet 14 and a water outlet 15. Figure 2 As shown, the housing 10 has a receiving space inside, and at least one baffle 20 is provided in the receiving space, and the receiving space is divided into a plurality of mutually independent subspaces 30 by at least one baffle 20. The baffle 20 is provided with a through hole 21, and adjacent subspaces 30 are connected through the through hole 21.

[0031] In a specific implementation, the first inlet 11 is communicated with one of the multiple subspaces 30, and the first outlet 12 is communicated with another subspace 30 of the multiple subspaces 30. A new hydrogen flow channel 22 is provided inside the baffle 20, and the second inlet 13 and the second outlet 14 are respectively communicated with the new hydrogen flow channel 22. The water outlet 15 is communicated with at least one of the multiple subspaces 30.

[0032] In the gas-liquid separation device for a fuel cell provided in the embodiment of the present application, when it is actually used, the high-humidity and high-temperature hydrogen (waste hydrogen) discharged from the stack enters the first inlet 11, flows through the multiple subspaces 30 separated by the baffle 20, and liquid water is separated on the outer wall of the baffle 20, thereby realizing the gas-liquid separation of the waste hydrogen. The dry low-temperature hydrogen (new hydrogen) supplied by the hydrogen storage system enters the second inlet 13, flows through the new hydrogen flow channel 22 inside the baffle 20, and enters the stack from the second outlet 14; under the influence of the new hydrogen inside the baffle 20, the waste hydrogen is more likely to separate liquid water on the outer wall of the baffle 20, making the gas-liquid separation of the waste hydrogen more thorough. After the waste hydrogen (separated hydrogen) after gas-liquid separation enters the stack from the first outlet 12, it is not easy to generate liquid water inside the stack, which can avoid flooding of the anode of the stack. The separated liquid water is discharged from the water outlet 15.

[0033] In practical applications, this device can realize thermal interaction between new hydrogen and waste hydrogen. While the new hydrogen cools down the waste hydrogen and makes it easier to separate liquid water from the waste hydrogen, the new hydrogen is heated by the waste hydrogen. The temperatures of the new hydrogen and the waste hydrogen tend to be the same, and the temperature difference is small. In this way, after the new hydrogen is mixed with the separated hydrogen, the temperature of the mixed gas is higher than the freezing point of water, which is not enough to produce liquid water inside the fuel cell stack, which can further eliminate the risk of flooding of the fuel cell anode.

[0034] In a specific implementation, when a plurality of baffles 20 are provided in the accommodation space, the plurality of baffles 20 may be provided in parallel with each other, and the spacing between adjacent baffles 20 may be the same. The through holes 21 on two adjacent baffles 20 may be provided in a staggered manner in the vertical direction of any of the baffles 20. For example, the through hole 21 on one baffle 20 may be provided close to the left side of the shell 10, and the through hole 21 on the other baffle 20 may be provided close to the right side of the shell 10. In this way, the flow path of the waste hydrogen is longer, and the waste hydrogen may fully flow through the plurality of sub-spaces 30, so that the gas-liquid separation of the waste hydrogen is more thorough, and the thermal interaction between the new hydrogen and the waste hydrogen is more sufficient.

[0035] In an actual setting, in the vertical direction of the baffle 20, the projection of the through hole 21 can be located within the projection range of the new hydrogen flow channel 22, so that the area occupied by the new hydrogen flow channel 22 is larger than the area occupied by the through hole 21, and the new hydrogen flow channel 22 can include the setting area of ​​the through hole 21. This can provide a larger flow channel for the new hydrogen, and a larger contact area with the baffle 20 for the waste hydrogen, and can also provide the waste hydrogen with more thermal interaction opportunities with the new hydrogen flowing through the new hydrogen flow channel 22, which not only helps the gas-liquid separation of the waste hydrogen, but also helps the thermal interaction between the new hydrogen and the waste hydrogen.

[0036] Figure 3 The structure schematic diagram of the baffle plate of the gas-liquid separation device for a fuel cell provided by the present application is shown. Figure 3 As shown, the baffle 20 may include a first sub-plate 201 and a second sub-plate 202, the first sub-plate 201 and the second sub-plate 202 may be arranged in parallel, and the first sub-plate 201 and the second sub-plate 202 are connected by a rib plate 203. The first sub-plate 201 is provided with a first through hole, and the second sub-plate 202 is provided with a second through hole. In the vertical direction of the first sub-plate 201, the projections of the rib plate 203, the first through hole and the second through hole coincide with each other, and the rib plate 203 is respectively connected with the first through hole and the second through hole to form a through hole 21. In this way, the new hydrogen flow channel 22 can be the space between the first sub-plate 201 and the second sub-plate 202 except for the area where the rib plate 203 is arranged, so as to maximize the occupied area of ​​the new hydrogen flow channel 22. In addition, the baffle 20 is composed of two sub-plates connected, which can improve the structural strength of the device and make the structure of the device more stable.

[0037] For example, the rib plate 203 , the first through hole and the second through hole may be quadrilaterals, respectively, forming a quadrilateral through hole 21 . Alternatively, the rib plate 203 , the first through hole and the second through hole may be circular, respectively, forming a circular through hole 21 .

[0038] Figure 4 1 shows a schematic diagram of the internal structure of the gas-liquid separation device for a fuel cell provided by the present application. As a possible implementation, the housing 10 may include a first side wall 101 and a second side wall 102, the baffle 20 is connected to the first side wall 101 and the second side wall 102 respectively, the second inlet 13 is arranged on the first side wall 101, and the second outlet 14 is arranged on the second side wall 102. Figure 4 As shown, the first side wall 101 has a first cavity 105 inside, which is connected to the second inlet 13 and the new hydrogen flow channel 22 respectively. The second side wall 102 has a second cavity 106 inside, which is connected to the second outlet 14 and the new hydrogen flow channel 22 respectively. Figure 4The bold lines in the figure indicate the flow path of new hydrogen, which flows through the second inlet 13, the first cavity 105, the new hydrogen flow channel 22, the second cavity 106, and the second outlet 14 in sequence. The arrangement of the first cavity 105 and the second cavity 106 provides an additional flow path for the new hydrogen, so that the waste hydrogen can be more easily separated from liquid water on the first side wall 101 and the second side wall 102, which is conducive to the gas-liquid separation of the waste hydrogen and the thermal interaction between the new hydrogen and the waste hydrogen.

[0039] In a specific implementation, the baffle 20 is provided with a notch. When a plurality of baffles 20 are provided in the accommodating space, in two adjacent baffles 20, the notch on one baffle 20 is connected to one of the first side wall 101 and the second side wall 102 to form a through hole 21, and the notch on the other baffle 20 is connected to the other of the first side wall 101 and the second side wall 102 to form a through hole 21. In this way, the through hole 21 is adjacent to the first side wall 101 or the second side wall 102, which can maximize the flow path of the waste hydrogen, make the gas-liquid separation of the waste hydrogen more thorough, and make the thermal interaction between the new hydrogen and the waste hydrogen more sufficient.

[0040] In a specific implementation, the shape of the notch may be U-shaped, and the shape of the through hole 21 may be quadrilateral. At this time, correspondingly, the shape of the rib plate 203 may be U-shaped.

[0041] As a possible implementation, the housing 10 may further include a third side wall 103 and a fourth side wall 104, one of the plurality of subspaces 30 is located between the third side wall 103 and a baffle 20, and another of the plurality of subspaces 30 is located between the fourth side wall 104 and a baffle 20. The first inlet 11 is disposed on the third side wall 103, and the first outlet 12 is disposed on the fourth side wall 104. Figure 2 The illustrated accommodation space is provided with two baffles 20 to form three sub-spaces 30 as an example. Figure 2 The waste hydrogen flow path is indicated by bold lines, and the waste hydrogen flows through the first inlet 11, the subspace 30, the through hole 21, the subspace 30, the through hole 21, the subspace 30, and the second outlet 14 in sequence, thereby realizing the circulation of the waste hydrogen in the shell 10.

[0042] In a specific implementation, the first side wall 101 and the second side wall 102 are arranged oppositely, the third side wall 103 and the fourth side wall 104 are arranged oppositely, the first side wall 101 and the second side wall 102 can be respectively used as the left side wall and the right side wall of the shell 10, the third side wall 103 and the fourth side wall 104 can be respectively used as the front side wall and the rear side wall of the shell 10, the first side wall 101, the third side wall 103, the second side wall 102 and the fourth side wall 104 are connected in sequence to form an annular structure. The shell 10 also includes a bottom wall and a top wall, the bottom wall and the top wall are respectively arranged at the bottom and the top of the annular structure, the bottom wall, the top wall and the annular structure enclose the shell 10, and the shell 10 can be a hexahedral structure. The water outlet 15 is arranged on the bottom wall to facilitate the separated liquid water to be discharged from the shell 10.

[0043] In a possible implementation, a heat dissipation layer is provided on the baffle 20, and the heat dissipation layer is provided in the new hydrogen flow channel 22, and the heat dissipation layer is in contact with the baffle 20. The provision of the heat dissipation layer can accelerate heat conduction and improve the thermal interaction efficiency between the new hydrogen and the waste hydrogen. Specifically, the heat dissipation layer can be a sheet structure, and can be made of a metal material with good thermal conductivity, such as copper, aluminum, etc.

[0044] Figure 5 The three-dimensional structure schematic diagram of the hydrogen supply device for fuel cells provided by the present application is shown. Figure 5 As shown, the hydrogen supply device for a fuel cell provided in an embodiment of the present application may include a hydrogen storage system 2 and a gas-liquid separation device 1 as in the above embodiment. The first inlet 11 of the gas-liquid separation device 1 may be connected to the fuel cell to receive waste hydrogen discharged from the fuel cell, the second inlet 13 may be connected to the hydrogen storage system 2, the second outlet 14 may be connected to the fuel cell to supply new hydrogen to the fuel cell, and the first outlet 12 and the second outlet 14 may be connected in parallel to the fuel cell.

[0045] In a specific implementation, the second outlet 14 can be connected to the fuel cell through the first pipeline, and the first pipeline can be connected to the ejector 3. The second inlet 13 can be connected to the hydrogen storage system 2 through the second pipeline, and the second pipeline can be connected to the first solenoid valve 4. The first outlet 12 can be connected to the first pipeline through the first branch, and the connection between the first branch and the first pipeline can be located between the ejector 3 and the fuel cell, and the pump body 5 can be connected to the first branch; and the first outlet 12 can be connected to the ejector 3 through the second branch. The water outlet 15 can be connected to the third pipeline, and the second solenoid valve 6 can be connected to the third pipeline.

[0046] In actual application, the new hydrogen supplied by the hydrogen storage system 2 enters the second inlet 13 of the gas-liquid separation device 1 through the first solenoid valve 4, flows through the new hydrogen flow channel 22, enters the ejector 3 through the second outlet 14, and then enters the fuel cell 7. The waste hydrogen discharged from the fuel cell 7 enters the first inlet 11 of the gas-liquid separation device 1, flows through the multiple subspaces 30 separated by the baffle 20, completes the gas-liquid separation, and the separated liquid water is discharged from the water outlet 15, and the separated hydrogen is discharged from the gas-liquid separation device 1 through the first outlet 12, and enters the fuel cell 7 through the ejector 3 or the pump body 5. The temperature of the new hydrogen and the waste hydrogen treated by the gas-liquid separation device 1 tends to be the same, and the temperature difference is small. In this way, after being ejected by the ejector 3, even if the volume of the mixed gas expands and the temperature decreases, the temperature of the mixed gas will still be higher than the freezing point of water, and it is not easy to generate liquid water inside the fuel cell 7, which can avoid the anode flooding of the fuel cell 7.

[0047] The flow path of separated hydrogen is relatively flexible. Specifically, the path for separated hydrogen to enter the fuel cell stack 7 may be different depending on the size of the electric power. For example, the high-power section is mainly based on the path where the ejector 3 is located, and the low-power section is mainly based on the path where the pump body 5 is located.

[0048] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited to the above embodiments. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope and spirit of the present application. If these changes and modifications fall within the scope of the claims of the present application and their equivalent technologies, the intention of the present application also includes these changes and modifications.

Claims

1. A gas-liquid separation device for a fuel cell, characterized in that: The invention comprises a housing, wherein the housing is provided with a first inlet, a first outlet, a second inlet, a second outlet and a water outlet; The housing has a containing space inside, the containing space is provided with at least one baffle, the containing space is divided into a plurality of mutually independent subspaces by the at least one baffle, the baffle is provided with through holes, and adjacent subspaces are connected through the through holes; the first inlet is connected to one of the plurality of subspaces, the first outlet is connected to another of the plurality of subspaces; the water outlet is connected to at least one of the plurality of subspaces; A new hydrogen flow channel is provided inside the baffle, and the second inlet and the second outlet are respectively connected to the new hydrogen flow channel; in the vertical direction of the baffle, the projection of the through hole is located within the projection range of the new hydrogen flow channel; When the accommodation space is provided with a plurality of baffles, the through holes on two adjacent baffles are staggered with each other in the vertical direction of any one of the baffles; The shell includes a first side wall and a second side wall, the baffle is connected to the first side wall and the second side wall respectively, the second inlet is arranged on the first side wall, and the second outlet is arranged on the second side wall; the first side wall has a first cavity inside, and the first cavity is communicated with the second inlet and the new hydrogen flow channel respectively; the second side wall has a second cavity inside, and the second cavity is communicated with the second outlet and the new hydrogen flow channel respectively; The baffle is provided with a notch; when the accommodating space is provided with a plurality of the baffles, in two adjacent baffles, the notch on one baffle is connected to one of the first side wall and the second side wall to form the via hole, and the notch on the other baffle is connected to the other of the first side wall and the second side wall to form the via hole.

2. The gas-liquid separation device for a fuel cell according to claim 1, characterized in that: The baffle includes a first sub-plate and a second sub-plate, and the first sub-plate and the second sub-plate are connected by a rib plate; The first sub-board is provided with a first through hole, and the second sub-board is provided with a second through hole. In the vertical direction of the first sub-board, the projections of the rib plate, the first through hole and the second through hole coincide with each other, and the rib plate is respectively connected with the first through hole and the second through hole to form the via hole.

3. The gas-liquid separation device for a fuel cell according to claim 1, characterized in that: The shell comprises a third side wall and a fourth side wall, one of the plurality of subspaces is located between the third side wall and one of the baffles, and another of the plurality of subspaces is located between the fourth side wall and one of the baffles; The first inlet is disposed on the third side wall, and the first outlet is disposed on the fourth side wall.

4. The gas-liquid separation device for a fuel cell according to claim 3, characterized in that: The first side wall and the second side wall are arranged opposite to each other, the third side wall and the fourth side wall are arranged opposite to each other, and the first side wall, the third side wall, the second side wall and the fourth side wall are connected in sequence to form a ring structure; The shell further comprises a bottom wall and a top wall, wherein the bottom wall and the top wall are respectively arranged at the bottom and the top of the annular structure, and the bottom wall, the top wall and the annular structure enclose to form the shell; The water outlet is arranged on the bottom wall.

5. The gas-liquid separation device for a fuel cell according to claim 1, characterized in that: A heat dissipation layer is disposed on the baffle, the heat dissipation layer is disposed in the new hydrogen flow channel, and the heat dissipation layer is in contact with the baffle.

6. A hydrogen supply device for a fuel cell, characterized in that: It comprises a hydrogen storage system and a gas-liquid separation device as claimed in any one of claims 1 to 5; The first inlet is used to connect to a fuel cell to receive hydrogen discharged from the fuel cell; The second inlet is connected to the hydrogen storage system, and the second outlet is used to be connected to the fuel cell to supply hydrogen to the fuel cell; The first outlet is used to be connected to the fuel cell in parallel with the second outlet.

7. The hydrogen supply device for a fuel cell according to claim 6, characterized in that: The second outlet is connected to the fuel cell via a first pipeline, and the first pipeline is connected to an ejector; The first outlet is connected to the first pipeline through a first branch, and the connection between the first branch and the first pipeline is located between the ejector and the fuel cell; the first outlet is connected to the ejector through a second branch.

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