Humidifier and fuel cell

Abstract

The invention relates to the technical field of fuel cells, in particular to a humidifier and a fuel cell. The humidifier comprises a shell and a humidifying structure, the shell is provided with a humidifying cavity, a gas inlet and a gas outlet, the gas inlet and the gas outlet both communicate with the humidifying cavity, and the gas inlet is used for making gas enter the humidifying cavity in the tangential direction; the area of the cross section of the humidifying cavity has a trend of gradually decreasing from top to bottom, so that gas spirally rotates around the longitudinal axis of the shell; the humidifying structure comprises a nozzle, the nozzle is partially arranged in the humidifying cavity to humidify gas entering the humidifying cavity, and the humidified gas flows out through the gas outlet. When the fuel cell works in a low-power section, as the nozzle can directly humidify the gas, compared with humidification through a permeable membrane humidifier and a hollow fiber tube humidifier in the prior art, the humidification effect is more obvious, and in addition, other structures are not additionally arranged in the shell except the nozzle, so that the overall size of the shell is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a humidifier and a fuel cell. Background Art

[0002] The proton exchange membrane of the fuel cell plays a decisive role in the performance of the battery. It not only has a barrier effect, but also has the function of conducting protons. Under humid conditions, it can achieve better working performance. Usually, the gas entering the fuel cell is humidified to prevent the proton exchange membrane from dehydrating during operation, avoiding performance reduction and damage to the working life.

[0003] In the prior art, fuel cell systems usually solve the humidification problem by adding a humidifier. The most commonly used humidifiers are osmotic membrane humidifiers and hollow fiber tube humidifiers. The above humidifiers generally change the humidification amount of the wet membrane humidifier by adjusting the gas flow, the size and thickness of the wet membrane, and the water temperature. However, most of the above humidifiers are large in size and weight, and because a bypass channel needs to be added or the temperature before and after the humidifier needs to be adjusted to stabilize the humidification effect, the humidification effect is difficult to control and the operation is complicated. In addition, the humidification effect is not obvious in the low power range of the fuel cell, resulting in reduced performance of the stack.

[0004] Therefore, a humidifier is urgently needed to solve the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a humidifier and a fuel cell, which can control the humidification effect under the premise of small volume and have obvious humidification effect in the low power range of the fuel cell.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, a humidifier is provided, comprising:

[0008] A shell having a humidification chamber, a gas inlet and a gas outlet, wherein the gas inlet and the gas outlet are both connected to the humidification chamber, the gas inlet is used to allow the gas to enter the humidification chamber tangentially, and the cross-sectional area of ​​the humidification chamber has a tendency to gradually decrease from top to bottom so that the gas spirally rotates around the longitudinal axis of the shell;

[0009] The humidification structure comprises a nozzle, wherein the nozzle part is arranged in the humidification chamber to humidify the gas entering the humidification chamber, and the humidified gas flows out through the gas outlet.

[0010] As a preferred technical solution of the above humidifier, the gas outlet is located at the top of the shell, the gas inlet is located at the side of the shell, and the height of the gas inlet is lower than the height of the gas outlet.

[0011] As a preferred technical solution of the above humidifier, it also includes an air guide tube, one end of which is located at the bottom of the humidification chamber, and the other end extends out of the gas outlet or is embedded in the gas outlet.

[0012] As a preferred technical solution of the above humidifier, the central axis of the air duct coincides with the longitudinal axis of the shell.

[0013] As a preferred technical solution of the above-mentioned humidifier, the shell includes a top cover and an outer shell, the outer shell forms a chamber with an opening, the top cover is arranged on the opening to close the chamber to form the humidification chamber, and the air duct and the top cover are an integrally formed structure.

[0014] As a preferred technical solution of the above humidifier, the humidification chamber includes a plurality of interconnected humidification sub-chambers, the chamber walls of the plurality of humidification sub-chambers are arc-shaped side walls, and the volumes of the plurality of humidification sub-chambers gradually decrease from top to bottom; or,

[0015] The cross section of the humidification chamber is an inverted trapezoid.

[0016] As a preferred technical solution of the above humidifier, the liquid outlet of the nozzle is arranged to face the gas flow direction.

[0017] As a preferred technical solution of the above humidifier, there are multiple nozzles, and the multiple nozzles are arranged in the humidification chamber at intervals from top to bottom.

[0018] As a preferred technical solution of the above humidifier, a plurality of the nozzles are arranged at equal intervals.

[0019] As a preferred technical solution of the above humidifier, the humidifier further includes a drain valve, a drain hole is provided at the bottom of the shell, and the drain valve is arranged in the drain hole.

[0020] As a preferred technical solution of the above humidifier, the humidification structure further includes a water supply tank and a booster pump, and the water containing chamber of the water supply tank is connected to the nozzle through a pipeline and a booster pump.

[0021] In a second aspect, a fuel cell is provided, comprising a gas source, a circulation pump, a fuel cell stack, a gas-liquid separator and a humidifier of any of the above schemes, wherein the outlet of the gas source is connected to the air inlet of the humidifier, the air outlet of the humidifier is connected to the gas inlet of the fuel cell stack, the gas outlet of the fuel cell stack is connected to the inlet of the gas-liquid separator, the air outlet of the gas-liquid separator is connected to the inlet of the circulation pump, and the air inlet of the gas-liquid separator is connected to the air inlet of the humidifier.

[0022] As a preferred technical solution of the above fuel cell, the drainage hole of the shell and the drainage port of the gas-liquid separator are both connected to a drainage valve.

[0023] The present invention has at least the following beneficial effects:

[0024] The humidifier and fuel cell provided by the present invention have a humidifying chamber whose cross-sectional area gradually decreases from top to bottom. After the gas with a certain speed enters the humidifying chamber tangentially from the gas inlet, most of the gas flows downward in a spiral path under the action of the cavity shape of the humidifying chamber. The nozzle extends into the humidifying chamber to directly spray liquid on the gas to humidify the gas. In this way, the humidification effect is adjusted by controlling the spray amount of the nozzle. When the fuel cell works in a low power section, the nozzle can directly humidify the gas. Compared with the humidification by a permeable membrane humidifier and a hollow fiber tube humidifier in the prior art, the humidification effect is more obvious. In addition, no other structure is provided in the shell except the nozzle, so the overall volume of the shell is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 A front view of a humidifier provided by an embodiment of the present invention;

[0027] Figure 2 A cross-sectional view of a humidifier provided by an embodiment of the present invention;

[0028] Figure 3 A block diagram of a fuel cell provided in accordance with an embodiment of the present invention.

[0029] In the figure:

[0030] 10. Humidifier; 1. Shell; 11. Outer shell; 111. Humidification chamber; 112. Gas inlet; 12. Top cover; 2. Nozzle; 3. Air guide tube; 4. Drain valve; 5. Water supply tank; 6. Booster pump;

[0031] 100. fuel cell; 101. gas source; 102. pressure reducing valve; 103. hydrogen injector; 104. ejector; 105. fuel cell stack; 106. gas-liquid separator; 107. circulation pump; 108. humidity sensor. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] like Figure 1-2 As shown, an embodiment of the present invention provides a humidifier, which has a small size, controllable humidification and obvious humidification effect.

[0037] Specifically, the humidifier 10 includes a shell 1 and a humidifying structure, wherein the shell 1 has a humidifying chamber 111, a gas inlet 112 and a gas outlet, the gas inlet 112 and the gas outlet are both connected to the humidifying chamber 111, the gas inlet 112 is used to allow the gas to enter the humidifying chamber 111 tangentially, and the cross-sectional area of ​​the humidifying chamber 111 tends to gradually decrease from top to bottom so that the gas can spirally rotate around the longitudinal axis of the shell 1; the humidifying structure includes a nozzle 2, and the nozzle 2 is partially arranged in the humidifying chamber 111 to humidify the gas entering the humidifying chamber 111, and the humidified gas flows out through the gas outlet.

[0038] Since the cross-sectional area of ​​the humidification chamber 111 gradually decreases from top to bottom, after the gas with a certain speed enters the humidification chamber 111 tangentially from the gas inlet 112, most of the gas flows downward in a spiral path under the action of the cavity shape of the humidification chamber 111, and the nozzle 2 extends into the humidification chamber 111 to directly spray liquid on the gas for humidification. In this way, the humidification effect is adjusted by controlling the spraying amount of the nozzle 2. When the fuel cell 100 works in the low power section, since the nozzle 2 can directly humidify the gas, the humidification effect is more obvious compared to the humidification by the permeable membrane humidifier and the hollow fiber tube humidifier in the prior art. In addition, no other structure is provided in the shell 1 except the nozzle 2, so the overall volume of the shell 1 is reduced.

[0039] In addition, the liquid sprayed from the nozzle 2 is atomized particles. Although it can humidify the gas, the gas contains water droplets. Centrifugal force is generated during the spiral rotation of the gas. Under the action of the centrifugal force, the water droplets are thrown to the wall of the humidification chamber 111. After the water droplets come into contact with the wall of the humidification chamber 111, they adhere to the wall of the humidification chamber 111 and flow downward under the action of gravity. They will not flow out of the gas outlet with the gas, thereby ensuring that the humidity of the gas flowing out of the gas outlet is moderate. Compared with the gas sprayed from the traditional humidifier with a large amount of water droplets, the hydrogen in the humidification chamber 111 provided by the present invention has a small water droplet content while ensuring the humidity.

[0040] In some embodiments, the humidification chamber 111 includes a plurality of interconnected humidification sub-chambers, the chamber walls of the plurality of humidification sub-chambers are arc-shaped side walls, and the volumes of the plurality of humidification sub-chambers gradually decrease from top to bottom, so that the cross section of the humidification chamber 111 gradually decreases from top to bottom. Of course, in some other embodiments, the cross section of the humidification chamber 111 is an inverted trapezoid. A specific shape of the humidification chamber 111 is provided herein, and as long as the spiral downward movement of the gas can be achieved, it is within the protection range.

[0041] In some embodiments, the housing 1 includes a top cover 12 and an outer shell 11, the outer shell 11 is formed with a chamber having an opening, the top cover 12 is arranged in the open closed chamber to form a humidification chamber 111, and the air duct 3 and the top cover 12 are an integrally formed structure. The air duct 3 and the top cover 12 are an integrally formed structure, which can achieve a sealed connection between the air duct 3 and the top cover 12 to prevent hydrogen from leaking from the connection between the air duct 3 and the top cover 12. In addition, the step of replacing the sealing gasket at the connection between the air duct 3 and the top cover 12 is omitted. In some other embodiments, a filter element is provided at the gas outlet, and the filter element is specifically arranged in the inner cavity of the air duct 3 to prevent impurities in the water from entering the battery stack 105 and affecting the internal structure of the battery stack 105. For example, the filter element is a filter mesh.

[0042] In some embodiments, the gas outlet is located at the top of the shell 1, and the gas inlet 112 is located at the side of the shell 1. The height of the gas inlet 112 is lower than the height of the gas outlet. Such a configuration can ensure that the gas will not flow out directly from the gas outlet after entering from the gas inlet 112. The spirally descending gas is humidified and flows directly into the gas outlet from the middle of the gas spiral trajectory. During the inflow process, some water droplets can drip under the action of gravity, further reducing the water content in the gas.

[0043] In some other embodiments, the gas outlet and the gas inlet 112 are both located on the side of the shell 1, specifically on the side of the outer shell 11, and the height of the gas outlet is lower than the height of the gas inlet 112, so that the humidified gas flows directly through the gas outlet into the fuel cell stack 105 after being humidified.

[0044] Furthermore, the humidifier 10 also includes an air duct 3, one end of which is located at the bottom of the humidification chamber 111, and the other end extends out of the gas outlet or is embedded in the gas outlet. The setting of the air duct 3 can guide the humidified gas. In addition, the air duct 3 can also seal the gas outlet to prevent the gas from entering from the gas inlet 112 and flowing directly out of the gas outlet without humidification, thereby improving the humidification rate of the gas. In addition, the setting of the air duct 3 can also make some water droplets adhere to the tube wall to prevent the water content of the humidified gas from exceeding expectations. It should be noted that the longitudinal cross-section of the air duct 3 can be rectangular, inverted trapezoidal or regular trapezoidal, and is not specifically limited in this embodiment, as long as the humidified gas can be guided out.

[0045] Furthermore, the central axis of the air guide pipe 3 coincides with the longitudinal axis of the shell 1. That is, the air guide pipe 3 is located in the middle of the shell 1. Such an arrangement allows the spirally descending humidified gas (i.e., hydrogen) to be guided from the bottom of the air guide pipe 3 to ensure that the gas at the bottom is guided out with minimal energy loss.

[0046] In some embodiments, the liquid outlet of the nozzle 2 is arranged to face the gas flow direction. Such an arrangement allows the mist liquid sprayed by the nozzle 2 to contact more gas to humidify the gas and improve the humidification effect. In addition, the humidified gas can have a more balanced humidity. In addition, the nozzle 2 is at least arranged at the lower part of the humidification chamber 111 to humidify the gas.

[0047] In some embodiments, there are multiple nozzles 2, and the multiple nozzles 2 are arranged in the humidification chamber 111 from top to bottom. The nozzles 2 are arranged in the humidification chamber 111 from top to bottom, which can achieve graded humidification of the gas, thereby ensuring the humidification effect of the gas. For example, when the humidification chamber 111 includes multiple connected humidification sub-chambers, the humidification sub-chambers have the same height, and each humidification sub-chamber is provided with at least one nozzle 2, and the multiple nozzles 2 are arranged at equal intervals. Such an arrangement facilitates the arrangement of the nozzles 2 and improves the humidification effect.

[0048] It should be noted that, in some embodiments, the spacing between the nozzles 2 is not specifically limited, and can be determined according to the size of the humidification chamber 111 of the actual shell 1 to ensure that the gas is humidified to the required humidity.

[0049] After the water droplets contact the cavity wall of the humidification cavity 111 in the shell 1 of the humidification cavity 111, they will gather at the cavity bottom of the humidification cavity 111 under the action of gravity. The water gathered at the cavity bottom needs to be discharged to prevent the accumulated water from blocking the port of the air guide tube 3 and preventing the humidified hydrogen from being discharged. For this reason, in some embodiments, the humidifier 10 also includes a drain valve 4. A drain hole is provided at the bottom of the shell 1, and the drain valve 4 is provided in the drain hole. When the water accumulation height at the cavity bottom reaches a certain value, the drain valve 4 will automatically open to discharge the water.

[0050] In order to provide a stable source of humidification liquid for the nozzle 2, in some embodiments, the humidification structure further includes a water supply tank 5 and a booster pump 6. The water storage chamber of the water supply tank 5 is connected to the nozzle 2 through a pipeline and the booster pump 6. The booster pump 6 provides power for the liquid in the water supply tank 5, so that the liquid in the water supply tank 5 is sprayed to the gas through the nozzle 2 to humidify the gas. It can be understood that the water supply tank 5 has at least two inlets, one of which is connected to the water outlet of the gas-liquid separator 106, so that water can be recycled, and the other inlet can be filled with external humidification water to ensure that the gas in the water supply tank 5 is humidified at any stage.

[0051] This embodiment also provides a fuel cell, such as Figure 3As shown, the fuel cell 100 includes a gas source 101, an ejector 104, a circulation pump 107, a stack 105, a gas-liquid separator 106, and a humidifier 10 provided in an embodiment of the present invention. The outlet of the gas source 101 is connected to the air inlet of the humidifier 10, the air outlet of the humidifier 10 is connected to the gas inlet of the stack 105, the gas outlet of the stack 105 is connected to the inlet of the gas-liquid separator 106, the air outlet of the gas-liquid separator 106 is connected to the inlet of the circulation pump 107, and the air inlet of the gas-liquid separator 106 is connected to the air inlet of the humidifier 10. The working flow inlet of the ejector 104 is connected to the outlet of the gas source 101, the ejection flow inlet of the ejector 104 is connected to the outlet of the circulation pump 107; the outlet of the ejector 104 is connected to the gas inlet 112 of the humidifier 10. For example, the gas source 101 is a high-pressure hydrogen bottle.

[0052] In the fuel cell 100 provided by the present invention, the air inlet of the gas-liquid separator 106 is connected to the air inlet of the humidifier 10, and the outlet of the gas source 101 is connected to the air inlet of the humidifier 10. The gas (i.e., hydrogen) entering the fuel cell 100 is humidified by the humidifier 10. Since the cross-sectional area of ​​the humidification chamber 111 gradually decreases from top to bottom, after the gas with a certain speed enters the humidification chamber 111 tangentially from the gas inlet 112, most of the gas is humidified by the cavity shape of the humidification chamber 111. The gas flows in a downward spiral path, and the nozzle 2 extends into the humidification chamber 111 to directly spray liquid on the gas for humidification. In this way, the humidification effect can be adjusted by controlling the spray volume of the nozzle 2. When the fuel cell 100 is working in a low power section, the nozzle 2 can directly humidify the gas. Compared with the humidification by the permeable membrane humidifier and the hollow fiber tube humidifier in the prior art, the humidification effect is more obvious. In addition, no other structure is provided in the shell 1 except the nozzle 2, so the overall volume of the shell 1 is reduced.

[0053] In addition, the liquid sprayed from the nozzle 2 is atomized particles. Although it can humidify the gas, the gas contains water droplets. Centrifugal force is generated during the spiral rotation of the gas. Under the action of the centrifugal force, the water droplets are thrown to the wall of the humidification chamber 111. After the water droplets come into contact with the wall of the humidification chamber 111, they adhere to the wall of the humidification chamber 111 and flow downward under the action of gravity. They will not flow out from the gas outlet with the gas, thereby ensuring that the humidity of the gas flowing out from the gas outlet is moderate.

[0054] In some embodiments, the drain hole of the housing 1 and the drain port of the gas-liquid separator 106 are both connected to the drain valve 4. This can reduce the use of components and reduce manufacturing costs. The extension direction of the gas inlet 112 is tangent to the contour line of the humidification chamber 111, so as to ensure that the gas entering the gas inlet 112 can enter the humidification chamber 111 tangentially.

[0055] In some embodiments, the fuel cell 100 further includes a humidity sensor 108, a pressure reducing valve 102 and a hydrogen injector 103. The humidity sensor 108 is disposed at the gas outlet of the humidification chamber 111 to detect the humidity of the gas. The controller controls the injection amount of the nozzle 2 or the number of injections of the nozzle 2 according to the humidity obtained by the humidity sensor 108. The air inlet of the pressure reducing valve 102 is connected to the air outlet of the gas source 101, the air outlet of the pressure reducing valve 102 is connected to the inlet of the hydrogen injector 103, and the hydrogen injector 103 is connected to the working flow inlet of the ejector 104. The pressure reducing valve 102 can reduce the pressure of hydrogen, and the hydrogen injector 103 mixes the hydrogen injection with the gas in the ejector 104 and the gas flowing out of the circulation pump 107 before entering the humidifier 10 for humidification.

[0056] Since the humidifier 10 is included, the fuel cell 100 of the embodiment of the present invention has all the advantages and beneficial effects of the above embodiments, which will not be described in detail here.

[0057] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A humidifier, characterized in that: include: A shell (1) having a humidifying chamber (111), a gas inlet (112) and a gas outlet, wherein the gas inlet (112) and the gas outlet are both in communication with the humidifying chamber (111), the gas inlet (112) is used to allow gas to enter the humidifying chamber (111) tangentially, and the cross-sectional area of ​​the humidifying chamber (111) tends to decrease gradually from top to bottom so as to allow the gas to spirally rotate around the longitudinal axis of the shell (1); The humidification structure comprises a nozzle (2), wherein the nozzle (2) is partially arranged in the humidification chamber (111) to humidify the gas entering the humidification chamber (111), and the humidified gas flows out through the gas outlet.

2. The humidifier according to claim 1, characterized in that The gas outlet is located at the top of the shell (1), and the gas inlet (112) is located at the side of the shell (1), and the height of the gas inlet (112) is lower than the height of the gas outlet.

3. The humidifier according to claim 2, characterized in that It also comprises an air guide tube (3), one end of which is located at the bottom of the humidification chamber (111), and the other end of which extends out of the gas outlet or is embedded in the gas outlet.

4. The humidifier according to claim 3, characterized in that: The central axis of the air guide tube (3) coincides with the longitudinal axis of the shell (1).

5. The humidifier according to claim 3, characterized in that: The housing (1) comprises a top cover (12) and an outer shell (11); the outer shell (11) forms a chamber with an opening; the top cover (12) is arranged at the opening to close the chamber to form the humidification chamber (111); and the air guide tube (3) and the top cover (12) are an integrally formed structure.

6. The humidifier according to claim 1, characterized in that The humidification chamber (111) comprises a plurality of interconnected humidification sub-chambers, the chamber walls of the plurality of humidification sub-chambers are arc-shaped side walls, and the volumes of the plurality of humidification sub-chambers gradually decrease from top to bottom; or, The cross section of the humidification chamber (111) is an inverted trapezoid.

7. The humidifier according to claim 1, characterized in that The liquid outlet of the nozzle (2) is arranged facing the flow direction of the gas.

8. The humidifier according to claim 1, characterized in that There are a plurality of nozzles (2), and the plurality of nozzles (2) are arranged in the humidification chamber (111) at intervals from top to bottom.

9. The humidifier according to claim 1, characterized in that: The plurality of nozzles (2) are arranged at equal intervals.

10. The humidifier according to claim 1, characterized in that The humidifier further comprises a drain valve (4); a drain hole is provided at the bottom of the housing (1); and the drain valve (4) is arranged in the drain hole.

11. The humidifier according to claim 1, characterized in that The humidification structure further comprises a water supply tank (5) and a booster pump (6); the water containing chamber of the water supply tank (5) is connected to the nozzle (2) via a pipeline and the booster pump (6).

12. A fuel cell, characterized in that: It comprises a gas source (101), a circulation pump (107), a fuel cell stack (105), a gas-liquid separator (106) and a humidifier as described in any one of claims 1 to 11, wherein the outlet of the gas source (101) is connected to the air inlet of the humidifier, the air outlet of the humidifier is connected to the gas inlet of the fuel cell stack (105), the gas outlet of the fuel cell stack (105) is connected to the inlet of the gas-liquid separator (106), the air outlet of the gas-liquid separator (106) is connected to the inlet of the circulation pump (107), and the air inlet of the gas-liquid separator (106) is connected to the air inlet of the humidifier.

13. The fuel cell according to claim 12, characterized in that The drainage hole of the shell (1) and the drainage port of the gas-liquid separator (106) are both in communication with the drainage valve (4).

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