Test current guarantee device for fuel cell system

Abstract

The utility model provides a fuel cell system test current guarantee device, which comprises a water storage tank and a humidification tank, liquid is supplied between the humidification tank and the water storage tank through a water pump, and a gas outlet of the humidification tank is communicated to a fuel cell, so that gas with certain humidity in the humidification tank enters the fuel cell from the gas outlet; a water flow adjusting piece is arranged between the water pump and the humidifying tank, and a pressure relief opening is formed in the side of the humidifying tank. The humidity stability of supplemented gas is improved, and the fluctuation degree of water flow to the humidifying tank is effectively controlled.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell testing equipment, and in particular to a fuel cell system test current protection device. Background Technology

[0002] During operation, the humidification tank of the existing fuel cell testing system is prone to water flow impact and pressure fluctuation due to factors such as the start and stop of the water pump and changes in water flow. This leads to large fluctuations in the water level inside the humidification tank, which in turn affects the current stability during fuel cell system testing.

[0003] These fluctuations not only cause airflow instability but also result in uneven humidity of the gas entering the fuel cell, thus affecting the performance of the proton exchange membrane and causing current output fluctuations. Simultaneously, pressure changes in the humidification tank are transmitted to the inside of the fuel cell through gas pipelines, disrupting the balance of air and hydrogen, affecting water distribution in the membrane electrode assembly, and consequently leading to current instability. Furthermore, significant pressure fluctuations can damage the internal structure of the humidification tank, shortening its lifespan, increasing maintenance costs, and affecting the accuracy and reliability of fuel cell system testing. Therefore, it is urgent to improve the design of the humidification tank in fuel cell system testing to enhance current stability, ensure the accuracy of test results, and facilitate long-term system performance evaluation. Utility Model Content

[0004] The purpose of this invention is to provide a fuel cell system test current protection device that improves the humidity stability of the supplementary gas and effectively controls the fluctuation of water flow in the humidification tank.

[0005] To solve the above-mentioned technical problems, this utility model provides a fuel cell system test current protection device, including a water storage tank and a humidification tank. The humidification tank and the water storage tank are connected by a water pump for liquid supply. The outlet of the humidification tank is connected to the fuel cell so that the gas with a certain humidity in the humidification tank enters the fuel cell through the outlet. A water flow regulating component is provided between the water pump and the humidification tank, and a pressure relief port is opened on the side of the humidification tank.

[0006] Furthermore, the humidifier tank has an inlet for connecting a water pump, and a diverter plate is installed at the inlet. The diverter plate covers the inlet and has several through holes. The through holes are arranged corresponding to the inlet so that the water flow at the inlet is diverted through the through holes.

[0007] Furthermore, the diverter plate has through grooves on both sides, which are arranged crosswise with the inlet so that the water flow at the inlet is dispersed by the diverter plate and flows to both sides of the diverter plate through the through grooves.

[0008] Furthermore, an air inlet is provided at the bottom of the humidifier canister, through which gas is supplied to the interior of the humidifier canister.

[0009] Furthermore, a pressure controller is connected to the pressure relief port, and a pressure relief valve is connected to one side of the pressure controller.

[0010] Furthermore, the water pump is connected to at least two humidification tanks, and a liquid inlet main line is connected to one side of the water pump. The liquid inlet main line is connected to two liquid inlet branch lines through a T-connector. The liquid inlet branch lines are connected to the water inlet of the humidification tanks. The at least two humidification tanks are respectively connected to both ends of the fuel cell.

[0011] Furthermore, the water flow regulating component is installed at the main liquid inlet pipeline.

[0012] Furthermore, exhaust ports are provided on both sides of the fuel cell.

[0013] The beneficial effects of this utility model are as follows: By connecting the air outlet of the humidification tank to the fuel cell to be tested, the humidification tank can directly supply gas with a certain humidity to the inside of the fuel cell, thereby maintaining the water vapor balance inside the fuel cell and improving the stability of the environment during the fuel cell testing process. At the same time, by using a water pump in conjunction with a water flow regulator to replenish water to the humidification tank in real time, the liquid volume in the humidification tank can be maintained at a certain level to ensure the accurate humidity of the gas humidified by the humidification tank. Furthermore, the water flow regulator can effectively control the amount of water entering the humidification tank from the water storage tank, thereby ensuring the stability of the water intake at the humidification tank, reducing the impact of water flow on the liquid surface inside the humidification tank, and thus avoiding pressure fluctuations caused by water flow impact.

[0014] Meanwhile, since the gas needs to be humidified in the humidification tank before entering the fuel cell, the gas replenishment in the humidification tank may cause the internal pressure of the humidification tank to increase continuously. At this time, the excessive pressure in the humidification tank can be released through the pressure relief port to ensure that the internal pressure of the humidification tank is not affected during the test, thereby avoiding the possibility that the internal pressure of the humidification tank will affect the humidity of the gas. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the diverter plate in this utility model.

[0017] Figure 3 This is a comparison chart of test systems using this solution and those not using this solution.

[0018] Figure 4 This is a schematic diagram showing the power density of a fuel cell at different potentials after using the current stability protection device of this scheme.

[0019] Reference numerals in the attached diagram: 1. Water storage tank; 2. Humidifier tank; 3. Water pump; 4. Fuel cell; 5. Air outlet; 6. Water flow regulating component; 7. Pressure relief port; 8. Water inlet; 9. Diverter plate; 10. Through hole; 11. Through groove; 12. Air inlet; 13. Pressure controller; 14. Pressure relief valve; 15. Main liquid inlet pipeline; 16. Sub-liquid inlet pipeline; 17. Exhaust port. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0021] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0023] like Figures 1-4 The present invention provides a test current protection device for a fuel cell system, including a water storage tank 1 and a humidification tank 2. The humidification tank 2 and the water storage tank 1 are connected by a water pump 3 for liquid supply. The outlet of the humidification tank 2 is connected to the fuel cell 4 so that the gas with a certain humidity in the humidification tank 2 enters the fuel cell 4 through the outlet 5. A water flow regulating component 6 is provided between the water pump 3 and the humidification tank 2. A pressure relief port 7 is opened on the side of the humidification tank 2.

[0024] When the outlet 5 of the humidifier tank 2 is connected to the fuel cell 4 to be tested, the water pump 3 supplies liquid from the water storage tank 1 to the humidifier tank 2 for replenishment and gas replenishment, so that the gas is humidified by the liquid and then delivered to the fuel cell 4 to be tested through the outlet 5; when the pressure in the humidifier tank 2 is greater than the set pressure, the pressure relief port 7 releases pressure from the humidifier tank 2 until the pressure in the humidifier tank 2 drops to the set pressure.

[0025] Connecting the outlet of the humidifier tank to the fuel cell under test allows the humidifier tank to directly supply gas with a certain humidity to the inside of the fuel cell, thereby maintaining the water vapor balance inside the fuel cell and improving the stability of the environment during fuel cell testing. At the same time, a water pump, in conjunction with a water flow regulator, replenishes water to the humidifier tank in real time, maintaining the liquid level in the humidifier tank at a certain level to ensure accurate humidity of the gas humidified by the humidifier tank. The water flow regulator effectively controls the amount of water entering the humidifier tank from the water storage tank, thereby ensuring stable water intake at the humidifier tank, reducing the impact of water flow on the liquid surface inside the humidifier tank, and thus avoiding pressure fluctuations caused by water flow impact.

[0026] Meanwhile, since the gas needs to be humidified in the humidification tank before entering the fuel cell, the gas replenishment in the humidification tank may cause the internal pressure of the humidification tank to increase continuously. At this time, the excessive pressure in the humidification tank can be released through the pressure relief port to ensure that the internal pressure of the humidification tank is not affected during the test, thereby avoiding the possibility that the internal pressure of the humidification tank will affect the humidity of the gas.

[0027] The water storage tank is connected to the water pump via a water pipe, and the air outlet of the humidification tank is connected to the fuel cell via an air pipe.

[0028] In one embodiment of this solution, the water flow regulating component is a water flow regulating valve.

[0029] Preferably, the humidifier tank 2 has an inlet 8 for connecting the water pump 3. A diverter plate 9 is installed at the inlet 8. The diverter plate 9 covers the inlet 8 and has several through holes 10. The several through holes 10 are arranged corresponding to the inlet 8 so that the water flow at the inlet 8 is diverted through the several through holes 10.

[0030] Specifically, when the water pump supplies water to the humidifier tank through the inlet, the water flow first contacts the flow divider plate after entering the humidifier tank. At this time, the water flow is blocked by the flow divider plate, and then the water flow is dispersed from each through hole to the interior of the humidifier tank. This process can effectively reduce the water flow fluctuation caused by the water flow directly entering the humidifier tank, thereby improving the stability of the liquid in the humidifier tank and ensuring a stable gas humidification effect.

[0031] Preferably, the diverter plate 9 has through grooves 11 on both sides, and the through grooves 11 are arranged crosswise with the inlet 8 so that the water flow at the inlet 8 is dispersed by the diverter plate 9 and flows to both sides of the diverter plate 9 through the through grooves 11.

[0032] Specifically, by setting through grooves on both sides of the diversion plate, when the water flow at the inlet is large, the water flow can be diverted not only through the through holes, but also through the through grooves on both sides. This allows the diversion plate to effectively divert the water flow even when the water flow is large, thus reducing the fluctuation of the water flow.

[0033] Preferably, the humidifier 2 has an air inlet 12 at the bottom, and the humidifier 2 is supplied with gas through the air inlet 12.

[0034] Specifically, the humidification tank is replenished with gas through the air inlet, allowing the humidified gas to enter the fuel cell. Since the air inlet is located at the bottom of the humidification tank, the gas undergoes thorough humidification during its ascent within the tank, greatly ensuring the stability of the gas humidification process.

[0035] In one embodiment of this solution, an air pipe is provided at the air inlet, which is connected to an external air supply device to ensure a stable air supply to the humidifier tank.

[0036] Preferably, a pressure controller 13 is connected to the pressure relief port 7, and a pressure relief valve 14 is connected to one side of the pressure controller 13.

[0037] Specifically, a pressure value is set at the pressure controller. When the pressure in the humidifier tank is higher than the pressure value, the pressure controller activates the pressure relief valve to release pressure, thereby reducing the pressure in the humidifier tank. When the pressure in the humidifier tank drops to the set pressure value, the pressure controller controls the pressure relief valve to close, thus ensuring the internal pressure balance of the humidifier tank during long-term use.

[0038] In one embodiment of this solution, the pressure value can be set to two types: an upper pressure limit and a lower pressure limit. When the internal pressure of the humidifier tank is greater than the upper pressure limit, the pressure relief valve is activated; when the internal pressure of the humidifier tank is less than the lower pressure limit, the pressure relief valve is closed.

[0039] Preferably, the water pump 3 is connected to at least two humidification tanks 2, and one side of the water pump 3 is connected to a liquid inlet main line 15. The liquid inlet main line 15 is connected to two liquid inlet branch lines 16 through a three-way pipe. The liquid inlet branch lines 16 are connected to the water inlet 8 of the humidification tanks 2. The at least two humidification tanks 2 are respectively connected to both ends of the fuel cell 4.

[0040] Specifically, by simultaneously supplying gas to both ends of the fuel cell through two humidification tanks, the detection efficiency and stability of the fuel cell are improved. At the same time, a liquid inlet main pipeline is set on one side of the water pump and connected to two liquid inlet branch pipelines. Liquid is supplied uniformly through the main pipeline and distributed through the branch pipelines to ensure the synchronous liquid replenishment effect of the two humidification tanks.

[0041] Preferably, the water flow regulating component 6 is installed at the liquid inlet main pipeline 15.

[0042] Specifically, since the water flow regulating component is installed at the main liquid inlet pipeline, it can uniformly regulate the water flow of the main liquid inlet pipeline, thereby ensuring the water flow at each liquid inlet branch pipeline without the need for separate installation at each liquid inlet branch pipeline, which can effectively reduce equipment costs.

[0043] Preferably, exhaust ports 17 are provided on both sides of the fuel cell 4.

[0044] Specifically, excess gas in the fuel cell is discharged through the exhaust port, and moisture is replenished inside the fuel cell in real time through a humidification tank to ensure the water vapor balance inside the fuel cell and prevent excessive gas pressure inside the fuel cell.

[0045] This solution has been tested and found to improve current stability and ensure the current fluctuation range. The testing process is as follows: Two identical fuel cell test systems are used, one of which is equipped with the current stability protection device of this solution. The electrical circuit is checked for proper connection. After verification, both test systems are started and connected to the fuel cell, running them under identical conditions for nearly 7000 seconds (constant fuel cell temperature of 80 degrees Celsius, saturated humidification, cathode gas flow rate of 2.6 L / min, anode gas flow rate of 0.6 L / min). The fuel cell current retention rate of the two devices is recorded every second. The comparison shows that the device with the current stability protection device is more stable in terms of improving the current fluctuation range than the device without it. Multiple experimental comparative analyses have shown that the device with the current stability protection device plays an important role in reducing the current fluctuation range and improving stability.

[0046] In another test of this scheme, the components and connections of the two fuel cell devices were checked to ensure they were normal, the electrical system was normal, and data recording was enabled. The operating conditions of the two fuel cell devices were uniformly set as follows: constant fuel cell temperature of 80 degrees Celsius, saturated humidification, cathode gas flow rate of 2.6 L / min, and anode gas flow rate of 0.6 L / min. The two fuel cell devices were started and allowed to reach a stable state, ensuring no abnormalities occurred. The two fuel cell test devices were then started sequentially and run under the set operating conditions for 7000 seconds, recording the current test data of both devices every second during the 7000 seconds of operation. After the devices stopped, the test data of the two devices were compared. A comparison of a foreign-imported fuel cell test device and a battery test device equipped with a current stability guarantee under the same operating conditions revealed that the device with the current stability guarantee device outperformed the foreign-imported device in terms of current stability. This indicates that the current stability guarantee device can effectively reduce current fluctuations and improve the current stability of the device (test comparison chart:). Figure 3 ).

[0047] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A fuel cell system test current assurance device, characterized by: The application relates to a water storage tank (1) and a humidification tank (2), wherein the humidification tank (2) is connected with the water storage tank (1) through a water pump (3) for liquid supply, the gas outlet of the humidification tank (2) is connected with a fuel cell (4) so that the gas with certain humidity in the humidification tank (2) enters the fuel cell (4) through the gas outlet (5), and the water flow adjusting member (6) is arranged between the water pump (3) and the humidification tank (2), and the pressure relief port (7) is arranged on the side of the humidification tank (2).

2. The fuel cell system test current assurance device of claim 1, wherein: The humidification tank (2) is provided with the water inlet (8) for connecting the water pump (3), the shunt plate (9) is arranged at the water inlet (8), the shunt plate (9) is arranged on the water inlet (8), a plurality of through holes (10) are arranged on the shunt plate (9), the plurality of through holes (10) are arranged in correspondence with the water inlet (8), and the water flow at the water inlet (8) is shunted through the plurality of through holes (10).

3. The fuel cell system test current safeguard of claim 2, wherein: The shunt plate (9) is provided with the through groove (11) on the two sides, the through groove (11) is arranged in cross with the water inlet (8), the water flow at the water inlet (8) is dispersed through the shunt plate (9), and then flows to the two sides of the shunt plate (9) through the through groove (11).

4. The fuel cell system test current assurance device of claim 1, wherein: The humidification tank (2) is provided with the air inlet (12) at the bottom, the inside of the humidification tank (2) is supplied with air through the air inlet (12).

5. The fuel cell system test current assurance device of claim 1, wherein: The pressure controller (13) is connected with the pressure relief valve (14) on one side.

6. The fuel cell system test current assurance device of claim 2, wherein: The water pump (3) is connected with at least two humidification tanks (2), the water pump (3) is connected with the liquid inlet main pipeline (15) on one side, the liquid inlet main pipeline (15) is connected with two liquid inlet branch pipelines (16) through the three-way pipe, the liquid inlet branch pipelines (16) are connected with the water inlets (8) of the humidification tanks (2), and the at least two humidification tanks (2) are connected with the two ends of the fuel cell (4) respectively.

7. The fuel cell system test current safeguard of claim 6, wherein: The water flow adjusting member (6) is arranged at the liquid inlet main pipeline (15).

8. The fuel cell system test current assurance device of claim 1, wherein: The fuel cell (4) is provided with the gas outlet (17) on the two sides.

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