CN216909520U

CN216909520U - Gas-liquid separation device for fuel cell system

Info

Publication number: CN216909520U
Application number: CN202123230253.2U
Authority: CN
Inventors: 张泽天; 陆峰; 齐雪飞; 弓晓虹; 杨奉斌; 周任凯
Original assignee: Shanghai Re Fire Energy and Technology Co Ltd
Current assignee: Shanghai Re Fire Energy and Technology Co Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-07-08
Anticipated expiration: 2031-12-21

Abstract

The utility model discloses a gas-liquid separation device for a fuel cell system, which comprises a left shell and a right shell which are hermetically connected, wherein the left end and the right end of the left shell are communicated, the left part of the left shell is provided with a gas-liquid inlet, the right part of the left shell is provided with a buffer cavity in which a flow guide part is arranged, the left end of the right shell is provided with an opening, the inner cavity of the right shell is divided into a first-stage water distribution inner cavity and a second-stage water distribution inner cavity by a partition plate, the left part of the first-stage water distribution inner cavity is convexly arranged, the right part of the second-stage water distribution inner cavity is provided with a first-stage gas outlet and a first-stage liquid outlet, a baffle plate assembly used for colliding with gas flow is arranged in the second-stage water distribution inner cavity, and the right shell is provided with a second-stage gas outlet and a second-stage liquid outlet on the side of the second-stage water distribution inner cavity. The gas-liquid separation device adopts a two-stage water diversion series structure, can improve the gas-liquid separation efficiency, and has a good gas-liquid separation effect.

Description

Gas-liquid separation device for fuel cell system

Technical Field

The utility model belongs to the technical field of fuel cells, and particularly relates to a gas-liquid separation device for a fuel cell system.

Background

The fuel cell is a clean, efficient and environment-friendly energy mode, and is widely applied to various fields such as automobiles, energy chemical industry and the like, wherein the hydrogen fuel cell can efficiently convert hydrogen energy into electric energy through electrochemical reaction. In a hydrogen fuel cell device, the anode of the stack receives hydrogen, the cathode of the stack receives oxygen, the hydrogen is not completely consumed at the anode of the stack and forms mixed gas with water and nitrogen to be discharged, and in order to recycle the hydrogen, reaction water and condensed water in the mixed gas need to be removed to proper humidity, so that the electrochemical reaction in the fuel cell can be smoothly carried out.

The existing fuel cell system is very sensitive to the existence of liquid water in a hydrogen circulation path, the use performance and the cycle life of the galvanic pile are affected when excessive liquid water enters the galvanic pile, and meanwhile, the liquid water in the hydrogen circulation path has the risk of icing in the starting, stopping and running processes under the environment of minus 30 ℃, so that the working state of a sensor and a switch valve is adversely affected, and the running stability and reliability of the fuel cell system are affected.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a gas-liquid separation device for a fuel cell system, which adopts a two-stage water-dividing series structure, can improve the gas-liquid separation efficiency and has a good gas-liquid separation effect.

The technical scheme adopted by the utility model for solving the technical problem is as follows:

the utility model provides a gas-liquid separation device for fuel cell system, includes sealing connection's left casing and right casing, both ends link up about the casing of a left side, left side casing left part is the gas-liquid entry, and the right part is the cushion chamber of establishing water conservancy diversion spare in for, right side casing left end opening, right side casing inner chamber is divided into the protruding one-level of establishing of left part by the baffle and divides the water inner chamber and the second grade of right part to divide the water inner chamber, be equipped with one-level gas vent and one-level leakage fluid dram on the baffle, the second grade divides the water inner intracavity to be equipped with and is used for the baffle subassembly with the air current collision, right side casing is equipped with second grade gas vent and second grade leakage fluid dram in second grade branch water inner chamber side.

Further, the gas-liquid inlet is a gas-liquid inlet pipe which is convexly arranged at the left part of the left shell, the inner diameter of the gas-liquid inlet pipe is equal to the inner diameter of the left end of the buffer cavity, the inner diameter of the left end of the buffer cavity is smaller than the inner diameter of the right end of the buffer cavity, the diameter of the primary water distribution inner cavity is larger than the inner diameter of the right end of the buffer cavity, the buffer cavity is positioned in the primary water distribution inner cavity, and the size of the secondary water distribution inner cavity is larger than the size of the primary water distribution inner cavity.

Furthermore, the first-stage exhaust port is a first-stage exhaust pipe which is arranged on the partition plate and located in the first-stage water diversion inner cavity, and the first-stage liquid outlet is arranged at the lower edge of the partition plate.

Further, the front end opening and the sealing connection front end plate of second grade water diversion inner chamber, the baffle subassembly is including being fixed in baffle right side and the first baffle of L shape that the opening left, the one-level gas vent is in the horizontal plate upside of first baffle, the vertical board top of first baffle with a determining deviation is left to second grade water diversion inner chamber roof inboard, the baffle subassembly is still including being in first baffle right side and being fixed in the inboard vertical second baffle of second grade water diversion inner chamber roof, second baffle bottom with a determining deviation is left to second grade water diversion inner chamber diapire inboard, the baffle right side of one-level gas vent top, the vertical board both sides of first baffle and second baffle left side all are fixed with horizontal dog.

Further, a plurality of the stop blocks are distributed at intervals.

Furthermore, the rear ends of the first baffle and the second baffle are fixed on the rear wall of the secondary water distribution inner cavity, and the front ends of the first baffle and the second baffle are tightly attached to the inner side face of the front end plate.

Further, the second grade gas vent is in second grade inner chamber rear wall upside that divides on second baffle right side, the roof left end department of second grade inner chamber that divides is equipped with the nitrogen discharging mouth, nitrogen discharging mouth department installs the nitrogen discharging valve, the second grade leakage fluid dram is located on the diapire of second grade inner chamber that divides, second grade leakage fluid dram department installs the flowing back and connects.

Furthermore, the metal rear end plate is connected to the outer side of the rear wall of the secondary water distribution inner cavity in a sealing mode, a gas outlet is formed in the position, corresponding to the secondary exhaust port, of the rear end plate, and a hydrogen pressure sensor and a one-way valve are installed at the position, corresponding to the secondary exhaust port, of the outer side of the rear end plate.

Further, the gas-liquid separation device for the fuel cell system further comprises a temperature control assembly for controlling the temperature of the hydrogen pressure sensor and the one-way valve.

Further, the temperature control component including set up in advance the coolant liquid joint and go out the coolant liquid joint outside the second grade inner chamber roof that divides, be equipped with on the second grade inner chamber roof that divides with advance the coolant liquid runner that advances that the coolant liquid connects the intercommunication, still be equipped with on the second grade inner chamber roof that divides with go out the coolant liquid runner that the coolant liquid connects the intercommunication, back end plate inboard be equipped with advance the end plate runner that the coolant liquid runner communicates with play coolant liquid runner, advance the coolant liquid joint and go out the coolant liquid joint all with cooling system connection.

Compared with the prior art, the utility model has the beneficial effects that:

the gas-liquid separation device for the fuel cell system comprises a left shell and a right shell which are hermetically connected, wherein the left end and the right end of the left shell are communicated, the left part of the left shell is a gas-liquid inlet, the right part of the left shell is a buffer cavity internally provided with a flow guide piece, the left end of the right shell is opened, an inner cavity of the right shell is divided into a first-stage water distribution inner cavity convexly arranged at the left part and a second-stage water distribution inner cavity at the right part by a partition plate, the partition plate is provided with a first-stage gas outlet and a first-stage liquid outlet, a baffle plate assembly used for colliding with gas flow is arranged in the second-stage water distribution inner cavity, and the right shell is provided with a second-stage gas outlet and a second-stage liquid outlet at the side of the second-stage water distribution inner cavity; thus, a gas-liquid mixture enters the left shell through the gas-liquid inlet and is subjected to diversion under the diversion action of the diversion piece, water drops moving along the inner wall of the buffer cavity and water drops with larger mass enter the primary water diversion inner cavity through inertia, liquid water is gathered at the primary water diversion inner cavity and flows to the bottom of the primary water diversion inner cavity along the inner wall of the primary water diversion inner cavity, mixed gas enters the secondary water diversion inner cavity through the primary exhaust port, the liquid water gathered at the bottom of the primary water diversion inner cavity flows into the bottom of the secondary water diversion inner cavity through the primary liquid outlet under the action of internal-external pressure difference and gravity, the mixed gas after primary water diversion collides with the baffle plate component in the secondary water diversion inner cavity to realize the adsorption and gathering of small liquid drops, large liquid drops realize gas-liquid separation through the action of gravity, are mixed with the liquid water flowing into the bottom of the secondary water diversion inner cavity from the primary liquid outlet and are discharged through the secondary liquid outlet, and gas is discharged through the second-stage exhaust port, and the device adopts a two-stage water-dividing series structure, so that the gas-liquid separation efficiency can be improved, and the gas-liquid separation effect is good.

According to the utility model, the gas-liquid inlet is a gas-liquid inlet pipe convexly arranged at the left part of the left shell, the inner diameter of the gas-liquid inlet pipe is equal to that of the left end of the buffer cavity, and the inner diameter of the left end of the buffer cavity is smaller than that of the right end of the buffer cavity, so that a gas-liquid mixture in the gas-liquid inlet pipe expands and decelerates when entering the buffer cavity, and the separation of water and mixed gas in the gas-liquid mixture is facilitated; the diameter of the first-stage water diversion inner cavity is larger than the inner diameter of the right end of the buffer cavity, and the buffer cavity is positioned in the first-stage water diversion inner cavity, so that an unseparated gas-liquid mixture in the buffer cavity expands and decelerates when entering the first-stage water diversion inner cavity, and the separation of water and mixed gas in the gas-liquid mixture is facilitated.

According to the utility model, the front end of the secondary water diversion inner cavity is opened and is hermetically connected with a front end plate, the baffle plate assembly comprises an L-shaped first baffle plate which is fixed on the right side of the baffle plate and has a left opening, the primary exhaust port is positioned on the upper side of a horizontal plate of the first baffle plate, a certain distance is reserved between the top end of a vertical plate of the first baffle plate and the inner side of the top wall of the secondary water diversion inner cavity, the baffle plate assembly also comprises a vertical second baffle plate which is positioned on the right side of the first baffle plate and is fixed on the inner side of the top wall of the secondary water diversion inner cavity, a certain distance is reserved between the bottom end of the second baffle plate and the inner side of the bottom wall of the secondary water diversion inner cavity, and horizontal stop blocks are fixed on the right side of the baffle plate above the primary exhaust port, two sides of the vertical plate of the first baffle plate and the left side of the second baffle plate; therefore, the mixed gas after primary water diversion firstly enters a channel formed by the partition board and the vertical board of the first baffle and flows vertically upwards, the mixed gas collides with the horizontal stop block on the right side of the partition board and the horizontal stop block on the left side of the vertical board of the first baffle, primary adsorption and gathering of small liquid drops are realized, the mixed gas then enters the channel formed by the vertical board of the first baffle and the second baffle and flows vertically downwards, the mixed gas collides with the horizontal stop block on the right side of the vertical board of the first baffle and the horizontal stop block on the left side of the second baffle, secondary adsorption and gathering of small liquid drops are realized, the gas-liquid separation efficiency can be improved, the mixed gas then enters a large secondary water diversion inner cavity on the right side of the second baffle, the flow rate of the mixed gas is rapidly reduced, because the secondary exhaust port is positioned on the upper side of the rear wall of the secondary water diversion inner cavity on the right side of the second baffle, the gas flow direction is turned vertically downwards to vertically upwards, the secondary water diversion of the utility model adopts the baffle principle to stop, slow down and condense and separate the small liquid drops in the gas so as to improve the gas-liquid separation effect.

In the utility model, the outer side of the rear wall of the secondary water-dividing inner cavity is hermetically connected with a metal rear end plate, a gas outlet is arranged at the position corresponding to a secondary exhaust port on the rear end plate, a hydrogen pressure sensor and a one-way valve are arranged at the gas outlet on the outer side of the rear end plate, a temperature control component comprises a cooling liquid inlet joint and a cooling liquid outlet joint which are arranged on the outer side of the top wall of the secondary water-dividing inner cavity, a cooling liquid inlet flow passage communicated with the cooling liquid inlet joint is arranged on the top wall of the secondary water-dividing inner cavity, a cooling liquid outlet flow passage communicated with the cooling liquid outlet joint is also arranged on the top wall of the secondary water-dividing inner cavity, an end plate flow passage communicated with the cooling liquid inlet flow passage and the cooling liquid outlet flow passage is arranged on the inner side of the rear end plate, and the cooling liquid inlet joint and the cooling liquid outlet joint are both connected with a cooling system; because the rear end plate is made of metal, the excellent heat conduction performance of metal is utilized, cooling medium in the cooling system enters through the cooling liquid inlet joint and flows into the end plate flow passage of the rear end plate through the cooling liquid flow passage, the constant temperature control of the hydrogen pressure sensor and the one-way valve arranged on the outer side of the rear end plate is realized, and cooling liquid finally flows into the cooling system again through the cooling liquid outlet passage and the cooling liquid outlet joint.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of the front end plate of FIG. 1 shown hidden in another direction;

FIG. 3 is a schematic perspective view of FIG. 1 in yet another orientation;

FIG. 4 is a schematic diagram of the exploded structure of FIG. 1;

FIG. 5 is a schematic cross-sectional view of FIG. 1;

fig. 6 is a partially sectional perspective view of the other direction of fig. 3.

The reference numbers in the figures illustrate: 1. the gas-liquid separator comprises a left shell, 2, a right shell, 3, a gas-liquid inlet pipe, 4, a flow guide piece, 5, a buffer cavity, 6, a partition plate, 7, a primary water dividing inner cavity, 8, a secondary water dividing inner cavity, 9, a primary exhaust port, 10, a primary liquid discharge port, 11, a secondary exhaust port, 12, a secondary liquid discharge port, 13, a liquid discharge joint, 14, a front end plate, 15, a first baffle, 16, a second baffle, 17, a stop block, 18, a nitrogen discharge port, 19, a nitrogen discharge valve, 20, a rear end plate, 21, a gas outlet, 22, a hydrogen pressure sensor, 23, a check valve, 24, a cooling liquid inlet joint, 25, a cooling liquid outlet joint, 26, a cooling liquid inlet flow channel, 27, a cooling liquid outlet flow channel, 28 and a sensor mounting pressing plate.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

A gas-liquid separation device for a fuel cell system comprises a left shell 1 and a right shell 2 which are connected in a sealing way, the left end and the right end of the left shell 1 are communicated, a gas-liquid inlet pipe 3 is convexly arranged at the left part of the left shell 1, a buffer cavity 5 with a flow guide piece 4 arranged inside is arranged at the right part of the left shell, the inner diameter of the gas-liquid inlet pipe 3 is equal to the inner diameter of the left end of the buffer cavity 5, the inner diameter of the left end of the buffer cavity 5 is smaller than the inner diameter of the right end of the right shell 2, the inner cavity of the right shell 2 is divided into a first-level water diversion inner cavity 7 convexly arranged at the left part and a second-level water diversion inner cavity 8 at the right part by a partition plate 6, the diameter of the first-level water diversion inner cavity 7 is larger than the inner cavity at the right end of the buffer cavity 5, the buffer cavity 5 is arranged in the first-level water diversion inner cavity 7, the size of the second-level water diversion inner cavity 8 is larger than the size of the first-level water diversion inner cavity 7, a first-level exhaust port 9 and a first-level exhaust port 10 are arranged on the partition plate 6, the first-level exhaust pipe arranged in the first-level water diversion inner cavity 7, one-level leakage fluid dram 10 sets up in 6 lower limb departments of baffle, is equipped with in the second grade water diversion inner chamber 8 and is used for the baffle subassembly with the air current collision, and right casing 2 is equipped with second grade gas vent 11 and second grade leakage fluid dram 12 in second grade water diversion inner chamber 8 side, and second grade leakage fluid dram 12 is in on the diapire of second grade water diversion inner chamber 8, and second grade leakage fluid dram 12 department installs flowing back and connects 13.

Wherein the front end of the secondary water diversion inner cavity 8 is opened and is connected with a front end plate 14 in a sealing way, the baffle plate component comprises an L-shaped first baffle plate 15 which is fixed on the right side of the baffle plate 6 and has a leftward opening, the primary exhaust port 9 is positioned on the upper side of a horizontal plate of the first baffle plate 15, the top end of a vertical plate of the first baffle plate 15 is spaced from the inner side of the top wall of the secondary water diversion inner cavity 8, the baffle plate component also comprises a vertical second baffle plate 16 which is positioned on the right side of the first baffle plate 15 and is fixed on the inner side of the top wall of the secondary water diversion inner cavity 8, the bottom end of the second baffle plate 16 is spaced from the inner side of the bottom wall of the secondary water diversion inner cavity 8, and the right side of the baffle plate 6 above the primary exhaust port 9, horizontal stop blocks 17 are fixed on two sides of a vertical plate of the first baffle plate 15 and the left side of the second baffle plate 16, the stop blocks 17 are distributed at intervals, the rear ends of the first baffle plate 15 and the second baffle plate 16 are fixed on the rear wall of the secondary water diversion inner cavity 8, and the front ends of the first baffle plate 15 and the second baffle plate 16 are tightly attached to the inner side surface of the front end plate 14; therefore, the mixed gas after primary water diversion firstly enters a channel formed by the partition plate 6 and the vertical plate of the first baffle plate 15 and flows vertically upwards, the mixed gas collides with the horizontal stop 17 on the right side of the partition plate 6 and the horizontal stop 17 on the left side of the vertical plate of the first baffle plate 15 to realize the primary adsorption and aggregation of small liquid drops, the mixed gas then enters the channel formed by the vertical plate of the first baffle plate 15 and the second baffle plate 16 and flows vertically downwards, the mixed gas collides with the horizontal stop 17 on the right side of the vertical plate of the first baffle plate 15 and the horizontal stop 17 on the left side of the second baffle plate 16 to realize the secondary adsorption and aggregation of small liquid drops, the gas-liquid separation efficiency can be improved, the mixed gas then enters the large secondary water diversion inner cavity 8 on the right side of the second baffle plate 16, the flow rate of the mixed gas is rapidly reduced, and the secondary exhaust port 11 is positioned on the upper side of the rear wall of the inner cavity 8 on the right side of the second baffle plate 16, therefore, the gas flow direction is changed from vertical downward to vertical upward, the gas-liquid separation is realized by the large liquid drops under the action of gravity, and the large liquid drops are mixed with the liquid water flowing into the bottom of the secondary water diversion inner cavity 8 from the primary liquid outlet 10 and are discharged through the secondary liquid outlet 12, so that the gas-liquid separation effect is improved.

Wherein, the top wall left end department of second grade water diversion inner chamber 8 is equipped with nitrogen outlet 18, and nitrogen outlet 18 department installs nitrogen discharge valve 19, and the nitrogen gas in the mist is outwards discharged through nitrogen outlet 18 after the small drop in the mist once adsorbs the gathering like this.

Wherein, the outer side of the back wall of the secondary water-dividing inner cavity 8 is hermetically connected with a metal back end plate 20, a gas outlet 21 is arranged at the position corresponding to the secondary exhaust port 11 on the back end plate 20, a hydrogen pressure sensor 22 and a one-way valve 23 are arranged at the position of the gas outlet 21 on the outer side of the back end plate 20, the hydrogen pressure sensor 22 is arranged on the back end plate 20 through a sensor mounting pressing plate 28, the gas-liquid separation device for the fuel cell system further comprises a temperature control component for controlling the temperature of the hydrogen pressure sensor 22 and the one-way valve 23, the temperature control component comprises a cooling liquid inlet connector 24 and a cooling liquid outlet connector 25 which are arranged at the outer side of the top wall of the secondary water-dividing inner cavity 8, a cooling liquid inlet channel 26 communicated with the cooling liquid inlet connector 24 is arranged on the top wall of the secondary water-dividing inner cavity 8, a cooling liquid outlet channel 27 communicated with the cooling liquid outlet connector 25 is also arranged on the top wall of the secondary water-dividing inner cavity 8, an end plate flow channel communicated with the cooling liquid inlet channel 26 and the cooling liquid outlet channel 27 is arranged on the inner side of the back end plate 20, the cooling liquid inlet joint 24 and the cooling liquid outlet joint 25 are both connected with a cooling system, and the cooling system is a water cooling system; by utilizing the excellent heat conduction performance of the metal rear end plate 20, a cooling medium in the cooling system enters through the cooling liquid inlet joint 24 and flows into the end plate flow passage of the rear end plate 20 through the cooling liquid flow passage, the constant temperature control of the hydrogen pressure sensor 22 and the check valve 23 arranged on the outer side of the rear end plate 20 is realized, the cooling liquid finally flows into the cooling system again through the cooling liquid outlet flow passage 27 and the cooling liquid outlet joint 25, the working temperature of the hydrogen pressure sensor 22 and the check valve 23 of the gas-liquid separation device is controlled by introducing the temperature control component, and the low-temperature reliability of the hydrogen pressure sensor 22 and the check valve 23 is improved.

In conclusion, the gas-liquid separation device adopts a two-stage water-dividing series structure to improve the gas-liquid separation efficiency, the first-stage water division adopts a centrifugal principle to realize the separation of large liquid drops in a gas-liquid mixture and water drops adsorbed on the pipe wall, and the second-stage water division adopts a baffle principle to stop, reduce the speed and condense and separate small liquid drops in gas; and a temperature control component is introduced to control the working temperature of the hydrogen pressure sensor 22 and the check valve 23, so that the low-temperature reliability of the hydrogen pressure sensor 22 and the check valve 23 is improved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a gas-liquid separation device for fuel cell system, includes left casing (1) and right casing (2) of sealing connection, both ends link up about left casing (1), left side casing (1) left part is the gas-liquid entry, and the cushion chamber (5) of establishing water conservancy diversion spare (4) in the right part is, its characterized in that: right side casing (2) left end opening, right side casing (2) inner chamber is divided into protruding one-level branch water inner chamber (7) of establishing in left part and second grade branch water inner chamber (8) of right part by baffle (6), be equipped with one-level gas vent (9) and one-level leakage fluid dram (10) on baffle (6), be equipped with the baffle subassembly that is used for colliding with the air current in second grade branch water inner chamber (8), right side casing (2) are equipped with second grade gas vent (11) and second grade leakage fluid dram (12) in second grade branch water inner chamber (8) side.

2. The gas-liquid separation device for a fuel cell system according to claim 1, characterized in that: the gas-liquid entry is protruding to be located gas-liquid inlet tube (3) of left side casing (1) left part, gas-liquid inlet tube (3) internal diameter with cushion chamber (5) left end internal diameter equals, cushion chamber (5) left end internal diameter is less than the right-hand member internal diameter, one-level water diversion inner chamber (7) diameter is greater than cushion chamber (5) right-hand member internal diameter, cushion chamber (5) are in one-level water diversion inner chamber (7), second grade water diversion inner chamber (8) size is greater than one-level water diversion inner chamber (7) size.

3. The gas-liquid separation device for a fuel cell system according to claim 2, characterized in that: the first-stage exhaust port (9) is a first-stage exhaust pipe which is arranged on the partition plate (6) and is positioned in the first-stage water diversion inner cavity (7), and the first-stage liquid discharge port (10) is arranged at the lower edge of the partition plate (6).

4. The gas-liquid separation device for a fuel cell system according to claim 2, characterized in that: the front end of the secondary water-dividing inner cavity (8) is opened and is hermetically connected with a front end plate (14), the baffle plate component comprises an L-shaped first baffle plate (15) which is fixed at the right side of the baffle plate (6) and has a leftward opening, the primary exhaust port (9) is positioned on the upper side of the horizontal plate of the first baffle plate (15), a certain distance is left between the top end of the vertical plate of the first baffle (15) and the inner side of the top wall of the secondary water distribution inner cavity (8), the baffle plate component also comprises a vertical second baffle plate (16) which is positioned at the right side of the first baffle plate (15) and fixed at the inner side of the top wall of the secondary water distribution inner cavity (8), a certain distance is left between the bottom end of the second baffle (16) and the inner side of the bottom wall of the secondary water-dividing inner cavity (8), horizontal stop blocks (17) are fixed on the right side of the partition plate (6) above the primary exhaust port (9), two sides of the vertical plate of the first baffle plate (15) and the left side of the second baffle plate (16).

5. The gas-liquid separation device for a fuel cell system according to claim 4, characterized in that: the stop blocks (17) are distributed at intervals.

6. The gas-liquid separation device for a fuel cell system according to claim 4, characterized in that: the rear ends of the first baffle (15) and the second baffle (16) are fixed on the rear wall of the secondary water distribution inner cavity (8), and the front ends of the first baffle (15) and the second baffle (16) are tightly attached to the inner side face of the front end plate (14).

7. The gas-liquid separation device for a fuel cell system according to claim 4, characterized in that: second grade gas vent (11) are in second grade inner chamber (8) back wall upside of dividing on second baffle (16) right side, the roof left end department of second grade inner chamber (8) of dividing is equipped with nitrogen discharging port (18), nitrogen discharging port (18) department installs nitrogen discharging valve (19), second grade leakage fluid dram (12) are in on the diapire of second grade inner chamber (8) of dividing, second grade leakage fluid dram (12) department installs flowing back and connects (13).

8. The gas-liquid separation device for a fuel cell system according to claim 7, characterized in that: the metal rear end plate (20) is connected to the outer side of the rear wall of the secondary water distribution inner cavity (8) in a sealing mode, a gas outlet (21) is formed in the position, corresponding to the secondary exhaust port (11), of the rear end plate (20), and a hydrogen pressure sensor (22) and a check valve (23) are installed in the position, corresponding to the secondary exhaust port (11), of the gas outlet (21) of the rear end plate (20) on the outer side.

9. The gas-liquid separation device for a fuel cell system according to claim 8, characterized in that: the gas-liquid separation device for the fuel cell system further comprises a temperature control assembly for controlling the temperature of the hydrogen pressure sensor (22) and the one-way valve (23).

10. The gas-liquid separation device for a fuel cell system according to claim 9, characterized in that: temperature control unit is including setting up in advance coolant liquid joint (24) and play coolant liquid joint (25) in the second grade water distribution inner chamber (8) roof outside, be equipped with on second grade water distribution inner chamber (8) roof with advance coolant liquid runner (26) of advancing that coolant liquid joint (24) communicate, still be equipped with on second grade water distribution inner chamber (8) roof with go out coolant liquid runner (27) that coolant liquid joint (25) communicate, back end plate (20) inboard be equipped with advance the end plate runner of coolant liquid runner (26) and play coolant liquid runner (27) intercommunication, advance coolant liquid joint (24) and go out coolant liquid joint (25) and all be connected with cooling system.