Gas-liquid separation device for fuel cell and fuel cell system

Abstract

The present invention provides a gas-liquid separation device for a fuel cell and a fuel cell system, the gas-liquid separation device comprising: a main body; a partition structure, dividing the inner cavity of the main body into an inlet cavity, a gas-liquid separation cavity and a liquid storage cavity located below and identical to them, the gas-liquid separation cavity being connected to the inlet cavity at the top; an inlet arranged on the inlet cavity; a baffle structure, arranged in the gas-liquid separation cavity, used to block the gas-liquid mixture entering the gas-liquid separation cavity from the inlet cavity to divert it; an exhaust cavity, connected to the gas-liquid separation cavity and arranged on the opposite side of the connection between the gas-liquid separation cavity and the inlet cavity relative to the baffle structure, the exhaust cavity extending upward from the gas-liquid separation cavity and having a gas outlet at its top; a liquid discharge port arranged at the bottom of the liquid storage cavity. The gas-liquid separation device of the present invention has low dependence on height difference, stable gas-liquid separation effect, compact structure, flexible connection interface arrangement, and low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular relates to a gas-liquid separation device for fuel cells and a fuel cell system. Background Art

[0002] Water management in a proton exchange membrane fuel cell system is one of the key factors that affect the operation of a proton exchange membrane fuel cell system. The mixture exiting the stack on the hydrogen side of the fuel cell mainly contains components such as hydrogen, nitrogen and water, and the water contained therein often exists in the form of a gas-liquid mixture, that is, it usually contains both water vapor and liquid water. If the liquid water in the mixture exiting the stack is not separated in time, the hydrogen reflux path will bring it back to the stack inlet, which will affect the operating humidity control of the stack, and in severe cases will cause water blockage inside the stack. In order to remove the liquid water droplets contained in the mixture exiting the stack on the hydrogen side of the fuel cell, a gas-liquid separation structure or device is generally provided at the hydrogen outlet of the stack.

[0003] Commonly used gas-liquid separation devices can be divided into centrifugal, inertial / gravity separation, filter element type and other types according to their uses and needs.

[0004] The inertial / gravity gas-liquid separation device mainly utilizes the difference in density between the gas phase and the liquid phase in the gas-liquid mixture to be separated. During the flow process of the gas-liquid separation device, the flow trajectories of the gas phase and the liquid phase are different under the action of inertia and gravity, forming a gas gathering area and a liquid gathering area. The inertial / gravity gas-liquid separation device has a simple structure, does not require additional driving energy, has small flow loss, and has high operational reliability. Such an inertial / gravity gas-liquid separation device mainly relies on the gravitational potential energy difference (i.e., height difference) to achieve the purpose of gas-liquid separation. It requires a sufficient height difference between the gas-liquid mixture inlet, the liquid discharge outlet, and the exhaust port. The gas-liquid separation device and the fuel cell system component connection interface layout require sufficient space accordingly, and the compact type is relatively large. In addition, the traditional inertial / gravity gas-liquid separation device requires a large liquid storage volume, and the gas-liquid separation efficiency is greatly affected by factors such as transient changes in airflow and liquid level sloshing. However, the space layout of the automotive fuel cell system is limited, requiring a compact structure, and having the characteristics of large load changes in working conditions and large vehicle operation sloshing amplitude. Traditional inertial / gravity gas-liquid separation devices used in automotive fuel cell systems generally have the following disadvantages: (1) large size, large water storage capacity, and high spatial layout requirements; (2) the gas-liquid separation effect is highly sensitive to the transient operating state of the vehicle, and the gas-liquid separation effect is unstable.

[0005] In addition, the flow loss of the filter element type gas-liquid separation device is relatively high, the filter element is easy to clog, the high and low temperature resistance is poor, and it needs to be replaced regularly.

[0006] Therefore, there is a need to provide a gas-liquid separation device with a simple structure and high separation efficiency to meet the development needs of automotive fuel cell systems. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a gas-liquid separation device for a fuel cell in view of the problems existing in the prior art. The gas-liquid separation device of the present invention has low dependence on height difference, stable gas-liquid separation effect, simple and compact structure, flexible connection interface arrangement, and low cost. In addition, the present invention also provides a fuel cell system.

[0008] The objectives of the present invention are achieved through the following technical solutions.

[0009] In one aspect, the present invention provides a gas-liquid separation device for a fuel cell, wherein the gas-liquid separation device comprises:

[0010] a body having an inner cavity;

[0011] a partition structure, wherein the partition structure divides the inner cavity into an inlet cavity, a gas-liquid separation cavity, and a liquid storage cavity located below the inlet cavity, the gas-liquid separation cavity communicates with the inlet cavity at the top, a first flow channel is provided between the bottom of the inlet cavity and the liquid storage cavity, and a second flow channel is provided between the bottom of the gas-liquid separation cavity and the liquid storage cavity;

[0012] An inlet of a gas-liquid separation device is arranged on the inlet cavity and is used to be connected to a hydrogen side outlet of the fuel cell stack;

[0013] a baffle structure, the baffle structure being arranged in the gas-liquid separation chamber and used for blocking the gas-liquid mixture entering the gas-liquid separation chamber from the inlet chamber to deflect it;

[0014] an exhaust chamber, the exhaust chamber being in communication with the gas-liquid separation chamber and being arranged on an opposite side of the connection between the gas-liquid separation chamber and the inlet chamber relative to the baffle structure, the exhaust chamber extending upward from the gas-liquid separation chamber and being provided with a gas outlet at the top thereof;

[0015] A liquid discharge port is arranged at the bottom of the liquid storage cavity.

[0016] Furthermore, the partition structure includes a vertical partition, a left partition and a right partition; wherein the vertical partition is vertically arranged in the inner cavity; the top of the vertical partition is spaced from the top wall of the inner cavity, and the lower part of the vertical partition extends downward and is respectively connected to the left partition inclined to the lower left and the right partition inclined to the lower right, thereby forming the inlet cavity, the gas-liquid separation cavity and the liquid storage cavity.

[0017] Furthermore, the left partition is inclined 30-60 degrees to the lower left relative to the horizontal direction.

[0018] Furthermore, the right partition is inclined 30 to 60 degrees to the lower right relative to the horizontal direction.

[0019] Furthermore, the first circulation channel is a V-shaped opening arranged on the left partition plate with the tip pointing upward along the plane of the left partition plate.

[0020] Furthermore, the second circulation channel is a V-shaped opening arranged on the right partition plate and the tip of the opening is upward along the plane of the right partition plate.

[0021] Furthermore, the volume ratio of the liquid storage cavity, the gas-liquid separation cavity and the inlet cavity is 1:1~1.5:2~3.

[0022] Furthermore, the baffle structure includes one or more baffles, and the one or more baffles are vertically arranged in the gas-liquid separation chamber, and the vertical partitions and the one or more baffles are arranged alternately in sequence.

[0023] Furthermore, the first circulation channel occupies 5-20% of the area of ​​the left partition plate, in particular 10-20%.

[0024] Furthermore, the second circulation channel occupies 5-20%, in particular 10-20%, of the area of ​​the right partition.

[0025] Furthermore, the inlet of the gas-liquid separation device is located in the lower middle part of the inlet cavity.

[0026] Furthermore, the exhaust chamber is located at the upper part of the gas-liquid separation chamber.

[0027] On the other hand, the present invention also provides a fuel cell system, wherein the fuel cell system includes a fuel cell stack, the gas-liquid separation device, a hydrogen reflux drive device and a tail exhaust valve, the inlet of the gas-liquid separation device is connected to the hydrogen side outlet of the fuel cell stack, the liquid outlet is connected to the tail exhaust valve, the gas outlet is connected to the reflux inlet of the hydrogen reflux drive device, and the reflux outlet of the hydrogen reflux drive device is connected to the hydrogen inlet of the fuel cell stack.

[0028] Furthermore, the hydrogen reflux driving device is a hydrogen reflux pump or an ejector.

[0029] The present invention has the following advantages: the gas-liquid separation device of the present invention is particularly suitable for separating the gas-liquid mixture from the hydrogen side outlet of the fuel cell system, has little dependence on height difference, has a stable gas-liquid separation effect, a simple and compact structure, and flexible connection interface arrangement; a baffle structure is used in the gas-liquid separation inner cavity to form a channel for changing the flow direction of the gas-liquid mixture to perform gas-liquid separation, and the manufacturing process is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 is a schematic structural diagram of an embodiment of a gas-liquid separation device according to the present invention;

[0032] Figure 2 is a main cross-sectional schematic diagram of an embodiment of a gas-liquid separation device according to the present invention;

[0033] Figure 3 is a left cross-sectional schematic diagram of an embodiment of a gas-liquid separation device according to the present invention;

[0034] Figure 4 is a schematic diagram of front and rear oblique sections of an embodiment of a gas-liquid separation device according to the present invention;

[0035] Figure 5 is a schematic structural diagram of an embodiment of a fuel cell system according to the present invention;

[0036] The above drawings include the following reference numerals:

[0037] Parts and structure description in the attached figure:

[0038] 4-hydrogen reflux drive device; 5-fuel cell stack; 8-gas-liquid separation device; 801-liquid storage chamber; 802-second circulation channel; 803-right partition; 804-vertical partition; 805-baffle structure; 806-exhaust chamber; 807-inlet chamber; 808-inlet of gas-liquid separation device; 809-left partition; 810-first circulation channel; 811-liquid discharge port; 812-gas-liquid separation chamber; 813-gas outlet; 9-tail exhaust valve. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0042] As a first aspect of the present invention, the present invention provides a gas-liquid separation device for a fuel cell, wherein the gas-liquid separation device comprises:

[0043] a body having an inner cavity;

[0044] a partition structure, wherein the partition structure divides the inner cavity into an inlet cavity, a gas-liquid separation cavity, and a liquid storage cavity located below the inlet cavity, the gas-liquid separation cavity communicates with the inlet cavity at the top, a first flow channel is provided between the bottom of the inlet cavity and the liquid storage cavity, and a second flow channel is provided between the bottom of the gas-liquid separation cavity and the liquid storage cavity;

[0045] An inlet provided on the inlet cavity, which is used to be connected to a hydrogen side outlet of the fuel cell stack;

[0046] a baffle structure, the baffle structure being arranged in the gas-liquid separation chamber and used for blocking the gas-liquid mixture entering the gas-liquid separation chamber from the inlet chamber to deflect it;

[0047] an exhaust chamber, the exhaust chamber being in communication with the gas-liquid separation chamber and being arranged on an opposite side of the connection between the gas-liquid separation chamber and the inlet chamber relative to the baffle structure, the exhaust chamber extending upward from the gas-liquid separation chamber and being provided with a gas outlet at the top thereof;

[0048] A liquid discharge port is arranged at the bottom of the liquid storage cavity.

[0049] Reference Figure 1-4 The gas-liquid separation device of the present invention includes: a main body, a partition structure, a gas-liquid separation device inlet 808, a baffle structure 805, an exhaust cavity 806 and a liquid discharge port 811.

[0050] The main body has an inner cavity, and the partition structure divides the inner cavity into an inlet cavity 807, a gas-liquid separation cavity 812, and a liquid storage cavity 801 located below them. The gas-liquid separation cavity 812 is connected to the inlet cavity 807 at the top, a first circulation channel 810 is provided between the bottom of the inlet cavity 807 and the liquid storage cavity 801, and a second circulation channel 802 is provided between the bottom of the gas-liquid separation cavity 812 and the liquid storage cavity 801.

[0051] The gas-liquid separation device inlet 808 is disposed on the inlet cavity 807 for connection with the hydrogen side outlet of the fuel cell stack.

[0052] The baffle structure 805 is disposed in the gas-liquid separation chamber 812 to block the gas-liquid mixture entering the gas-liquid separation chamber 812 from the inlet chamber 807 to deflect it.

[0053] The exhaust chamber 806 is connected to the gas-liquid separation chamber 812 and is arranged on the opposite side of the connection between the gas-liquid separation chamber 812 and the inlet chamber 807 relative to the baffle structure 805. The exhaust chamber 806 extends upward from the gas-liquid separation chamber 812 and is provided with a gas outlet 813 at its top.

[0054] The liquid discharge port 811 is disposed at the bottom of the liquid storage cavity 801 .

[0055] The inventors of the present application discovered that a partition structure is used to divide the inner cavity of the main body of the gas-liquid separation device into different functional areas, namely, an inlet cavity 807, a gas-liquid separation cavity 812 and a liquid storage cavity 801. The liquid level shaking of the liquid storage cavity 801 has little interference with the gas-liquid separation effect. The inlet 808 of the gas-liquid separation device only needs to be connected to the inlet cavity 807, and its specific position can be flexibly selected, and the overall device layout is flexible.

[0056] In the present invention, the gas-liquid mixture from the hydrogen side of the fuel cell stack enters the inlet cavity 807 through the inlet 808 of the gas-liquid separation device, and is initially separated in the inlet cavity 807. The liquid and part of the gas-liquid mixture enter the liquid storage cavity 801 through the first flow channel 810, and the gas and the remaining gas-liquid mixture enter the gas-liquid separation cavity 812 from the top. The gas and the gas-liquid mixture flow through the baffle structure 805, and the flow direction suddenly changes. The obvious difference in the density characteristics of the gas phase and the liquid phase in the separated gas-liquid mixture is utilized. During the flow process, the inertia and gravity cause the flow trajectory of the gas phase and the liquid phase to differ, thereby achieving gas-liquid separation. Among them, the gas is discharged from the gas outlet 813, and the liquid and the gas-liquid mixture enter the liquid storage cavity 801 through the second flow channel 802. The liquid collected in the liquid storage cavity 801 can be discharged through the drain port 811.

[0057] In the present invention, the gas-liquid separation chamber 812 can be arranged at the same height as the inlet chamber 807. Compared with conventional gas-liquid separation devices, the gas-liquid separation device of the present invention is less dependent on the gravitational potential energy difference (ie, height difference), and the gas-liquid separation device has a compact and flexible structure.

[0058] According to one embodiment of the present invention, the partition structure includes a vertical partition 804, a left partition 809 and a right partition 803. The vertical partition 804 is vertically arranged in the inner cavity, the top of the vertical partition 804 is spaced from the top wall of the inner cavity, and the lower part of the vertical partition 804 extends downward and is respectively connected to the left partition 809 inclined to the lower left and the right partition 803 inclined to the lower right, thereby forming an inlet cavity 807, a gas-liquid separation cavity 812 and a liquid storage cavity 801.

[0059] In the present invention, the vertical partition 804, the left partition 809 and the right partition 803 form a "herringbone" partition structure, and such a "herringbone" partition structure can flexibly divide the inner cavity into an inlet cavity 807, a gas-liquid separation cavity 812 and a liquid storage cavity 801.

[0060] According to a specific embodiment of the present invention, the left partition 809 and the right partition 803 are smoothly connected to the vertical partition 804 from the left and right sides, and then connected to the inner wall of the main body, thereby facilitating the downward flow of liquid and avoiding liquid accumulation.

[0061] According to one embodiment of the present invention, the left partition 809 is inclined 30-60 degrees to the lower left relative to the horizontal direction, and the right partition 803 is inclined 30-60 degrees to the lower right relative to the horizontal direction.

[0062] According to one embodiment of the present invention, referring to Figure 4The first circulation channel 810 is a V-shaped opening disposed at the lower end of the left partition 809 and with its tip pointing upward along the plane of the left partition, and the second circulation channel 802 is a V-shaped opening disposed at the lower end of the right partition 803 and with its tip pointing upward along the plane of the right partition. In the present invention, the V-shaped opening is used as the first circulation channel 810 and the second circulation channel 802, which is conducive to the gathering and discharge of liquid.

[0063] Of course, other structures can also be used as the first circulation channel 810 and the second circulation channel 802 in the present invention. In particular, the left partition 809 and the right partition 803 have gaps between their lower ends and the side walls of the inner cavity to serve as the first circulation channel 810 and the second circulation channel 802, respectively. Figure 4 In the illustrated embodiment, the left partition 809 is provided with a V-shaped opening, and at the same time, a gap is left between the inner lower end portion of the left partition 809 and the inner wall of the main body.

[0064] According to one embodiment of the present invention, the area of ​​the first circulation channel 810 and the second circulation channel 802 can be determined according to the drainage volume of the fuel cell system and the gas flow volume when the tail exhaust valve of the fuel cell system is opened. In a preferred embodiment, the first circulation channel 810 occupies 5-20%, especially 10-20%, of the area of ​​the left partition plate 809. Similarly, the second circulation channel 802 occupies 5-20%, especially 10-20% of the area of ​​the right partition plate 803.

[0065] According to an embodiment of the present invention, the volume of each cavity can be reasonably designed by setting the inclination angle and height of the left partition 809 and the right partition 803, thereby improving the separation efficiency. According to a preferred embodiment of the present invention, the volume ratio of the liquid storage cavity 801, the gas-liquid separation cavity 812 and the inlet cavity 807 is 1:1~1.5:2~3.

[0066] According to one embodiment of the present invention, the baffle structure 805 includes one or more baffles, and the one or more baffles are vertically arranged in the gas-liquid separation chamber 812, and the vertical partitions 804 and the one or more baffles are arranged alternately in sequence.

[0067] According to a preferred embodiment of the present invention, the baffle structure 805 includes more than 2 baffles, preferably 2 to 6 baffles, and more preferably 2 to 4 baffles. The first baffle is vertically arranged adjacent to the connection between the gas-liquid separation cavity 812 and the inlet cavity 807, and the remaining baffles are arranged alternately with the first baffle. By using multiple sets of staggered baffles, multiple gas-liquid separations can be achieved, which is conducive to improving separation efficiency.

[0068] According to one embodiment of the present invention, the gas-liquid separation device inlet 808 is located in the lower middle part of the inlet cavity 807 , particularly in the middle part.

[0069] According to one embodiment of the present invention, since the liquid water content in the gas-liquid mixture after separation by the gas-liquid separation chamber 812 is small, the position of the exhaust chamber 806 can be relatively flexibly selected according to the overall fuel cell system. In particular, the exhaust chamber 806 can be located at the upper part of the gas-liquid separation chamber 812, for example, at the top or upper side of the gas-liquid separation chamber 812.

[0070] According to one embodiment of the present invention, the liquid storage cavity 801 is funnel-shaped, which is conducive to increasing drainage, reducing liquid level sloshing during vehicle operation, and preventing local water accumulation.

[0071] According to one embodiment of the present invention, the gas-liquid separation device of the present invention is prepared by injection molding using a (heat-resistant) plastic material known in the art, which has low cost and simple process.

[0072] In addition, although not preferred, the gas-liquid separation device of the present invention can also be formed by machining or 3D printing using thin-walled metal materials.

[0073] As a second aspect of the present invention, the present invention also provides a fuel cell system.

[0074] Reference Figure 5 The fuel cell system of the present invention comprises a fuel cell stack 5, a gas-liquid separation device 8, a hydrogen reflux drive device 4 and a tail exhaust valve 9. The gas-liquid separation device inlet 808 is connected to the hydrogen gas outlet of the fuel cell stack 5, the liquid outlet 811 is connected to the tail exhaust valve 9, the gas outlet 813 is connected to the reflux inlet of the hydrogen reflux drive device 4, and the reflux outlet of the hydrogen reflux drive device 4 is connected to the hydrogen inlet of the fuel cell stack 5.

[0075] In the present invention, the drain port 811 can be directly connected to the tail drain valve 9 of a conventional fuel cell system to discharge gas and water at the same time without adding an additional drainage device.

[0076] In the present invention, the term "fuel cell system" refers to a proton exchange membrane fuel cell system.

[0077] According to one embodiment of the present invention, the hydrogen reflux driving device 4 is a hydrogen reflux pump or an ejector.

[0078] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0079] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0080] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas-liquid separation device for a fuel cell, It is characterized in that The gas-liquid separation device comprises: a body having an inner cavity; a partition structure, wherein the partition structure divides the inner cavity into an inlet cavity (807), a gas-liquid separation cavity (812), and a liquid storage cavity (801) located below the inlet cavity (807), the gas-liquid separation cavity (812) being connected to the inlet cavity (807) at the top, a first circulation channel (810) being provided between the bottom of the inlet cavity (807) and the liquid storage cavity (801), and a second circulation channel (802) being provided between the bottom of the gas-liquid separation cavity (812) and the liquid storage cavity (801); An inlet (808) of a gas-liquid separation device is arranged on the inlet cavity (807) and is used to be connected to a hydrogen outlet of the fuel cell stack; a baffle structure (805), the baffle structure (805) being arranged in the gas-liquid separation cavity (812) and being used to block the gas-liquid mixture entering into the gas-liquid separation cavity (812) from the inlet cavity (807) so as to redirect the gas-liquid mixture; an exhaust chamber (806), the exhaust chamber (806) being in communication with the gas-liquid separation chamber (812) and being arranged on the opposite side of the connection between the gas-liquid separation chamber (812) and the inlet chamber (807) relative to the baffle structure (805), the exhaust chamber (806) extending upward from the gas-liquid separation chamber (812) and having a gas outlet (813) at the top thereof; A liquid discharge port (811), wherein the liquid discharge port (811) is arranged at the bottom of the liquid storage cavity (801); Wherein, the partition structure includes a vertical partition (804), a left partition (809) and a right partition (803); Wherein, the vertical partition (804) is vertically arranged in the inner cavity; The top of the vertical partition (804) is spaced from the top wall of the inner cavity, and the lower part of the vertical partition (804) extends downward and is respectively connected to the left partition (809) tilted downward to the left and the right partition (803) tilted downward to the right, thereby forming the inlet cavity (807), the gas-liquid separation cavity (812) and the liquid storage cavity (801); Wherein, the first circulation channel (810) occupies 5 to 20% of the area of ​​the left partition (809); Wherein, the second circulation channel (802) occupies 5 to 20% of the area of ​​the right partition plate (803); Wherein, the left partition (809) is inclined 30 to 60 degrees to the lower left relative to the horizontal direction, and the right partition (803) is inclined 30 to 60 degrees to the lower right relative to the horizontal direction; The first circulation channel (810) is a V-shaped opening provided on the left partition plate (809) and with its tip pointing upward along the plane of the left partition plate, and the second circulation channel (802) is a V-shaped opening provided on the right partition plate (803) and with its tip pointing upward along the plane of the right partition plate; There are gaps between the lower ends of the left partition (809) and the right partition (803) and the side walls of the inner cavity, which serve as the first circulation channel (810) and the second circulation channel (802), respectively.

2. The gas-liquid separation device according to claim 1, It is characterized in that The volume ratio of the liquid storage cavity (801), the gas-liquid separation cavity (812) and the inlet cavity (807) is 1:1-1.5:2-3.

3. The gas-liquid separation device according to claim 2, It is characterized in that The baffle structure (805) comprises one or more baffles, wherein the one or more baffles are vertically arranged in the gas-liquid separation chamber (812), and the vertical partitions (804) and the one or more baffles are arranged alternately in sequence.

4. The gas-liquid separation device according to claim 3, It is characterized in that The gas-liquid separation device inlet (808) is located in the lower middle portion of the inlet cavity (807); Wherein, the exhaust chamber (806) is located at the upper part of the gas-liquid separation chamber (812).

5. A fuel cell system, It is characterized in that The fuel cell system comprises a fuel cell stack (5), a gas-liquid separation device (8) according to any one of claims 1 to 4, a hydrogen reflux drive device (4) and a tail exhaust valve (9), wherein the inlet (808) of the gas-liquid separation device is connected to the hydrogen side outlet of the fuel cell stack (5), the liquid outlet (811) is connected to the tail exhaust valve (9), the gas outlet (813) is connected to the reflux inlet of the hydrogen reflux drive device (4), and the reflux outlet of the hydrogen reflux drive device (4) is connected to the hydrogen inlet of the fuel cell stack (5).

6. The fuel cell system according to claim 5, It is characterized in that The hydrogen reflux driving device (4) is a hydrogen reflux pump or an ejector.

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