An improved fuel cell system test current stability assurance device

Abstract

The present invention provides an improved fuel cell system test current stability assurance device, comprising a water storage tank and a humidifying tank, wherein liquid is supplied between the humidifying tank and the water storage tank through a water pump, and an air outlet of the humidifying tank is connected to the fuel cell, so that gas with a certain humidity in the humidifying tank enters the fuel cell through the air outlet; a water flow regulating component is arranged between the water pump and the humidifying tank, and a pressure relief port is arranged on the side of the humidifying tank; when the air outlet of the humidifying tank is connected to the fuel cell to be tested, the water pump supplies the liquid in the water storage tank to the humidifying tank for liquid replenishment, and replenishes the humidifying tank with gas, so that the gas is humidified by the liquid and then transported to the fuel cell to be tested through the air outlet; when the pressure in the humidifying tank is greater than the set pressure, the pressure relief port relieves the pressure on the humidifying tank until the pressure in the humidifying tank drops to the set pressure; the present invention improves the humidity stability of the supplementary gas and effectively controls the fluctuation degree of the water flow on the humidifying tank.

Description

Technical Field

[0001] The invention relates to the field of fuel cell detection equipment, and in particular to an improved fuel cell system test current stability guarantee device. Background Art

[0002] During operation, the humidification tank of the existing fuel cell detection system is prone to water flow shock and pressure fluctuations due to factors such as the start and stop of the water pump and water flow changes, which in turn causes large fluctuations in the water surface in the humidification tank, thereby affecting the current stability in the fuel cell system test.

[0003] This fluctuation not only causes unstable airflow, but also makes the humidity of the gas entering the fuel cell uneven, which in turn affects the performance of the proton exchange membrane and causes current output fluctuations. At the same time, the pressure changes in the humidification tank are transmitted to the inside of the fuel cell through the gas pipeline, interfering with the balance of air and hydrogen, affecting the water distribution of the membrane electrode, and thus causing current instability. In addition, large pressure fluctuations may also damage the internal structure of the humidification tank, shorten its service life, increase maintenance costs, and affect the accuracy and reliability of fuel cell system testing. Therefore, it is urgent to improve the relevant design of the humidification tank in the fuel cell system test to improve the current stability, ensure the accuracy of the test results and the long-term performance evaluation of the system. Summary of the invention

[0004] The object of the present invention is to provide an improved fuel cell system test current stability assurance device which can improve the humidity stability of the supplementary gas and effectively control the fluctuation degree of the water flow to the humidification tank.

[0005] In order to solve the above technical problems, the present invention provides an improved fuel cell system test current stability guarantee device, comprising a water storage tank and a humidifying tank, wherein the humidifying tank and the water storage tank are supplied with liquid through a water pump, and the gas outlet of the humidifying tank is connected to the fuel cell, so that the gas with a certain humidity in the humidifying tank enters the fuel cell through the gas outlet; a water flow regulating member is arranged between the water pump and the humidifying tank, and a pressure relief port is arranged on the side of the humidifying tank; When the air outlet of the humidifier tank is connected to the fuel cell to be tested, the water pump supplies the liquid in the water storage tank to the humidifier tank for liquid replenishment, and replenishes the gas in the humidifier tank, so that the gas is humidified by the liquid and then transported to the fuel cell to be tested from the air outlet; when the pressure in the humidifier tank is greater than the set pressure, the pressure relief port relieves the pressure in the humidifier tank until the pressure in the humidifier tank drops to the set pressure.

[0006] Furthermore, the humidifier tank is provided with a water inlet for connecting a water pump, a diverter plate is installed at the water inlet, the diverter plate cover is arranged at the water inlet, and a plurality of through holes are provided on the diverter plate, the plurality of through holes are arranged corresponding to the water inlet, so that the water flow at the water inlet can be diverted through the plurality of through holes.

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

[0008] Furthermore, an air inlet is provided at the bottom of the humidifying tank, and the humidifying tank replenishes gas inside the humidifying tank through the air inlet.

[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, and the liquid inlet main line is connected to two liquid inlet branch lines through a three-way pipe. The liquid inlet branch lines are connected to the water inlet of the humidification tank, and the at least two humidification tanks are respectively connected to the two ends of the fuel cell.

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

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

[0013] The beneficial effects of the present invention are as follows: the air outlet of the humidifier tank is connected to the fuel cell to be tested, so that the humidifier 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 stable environment during the fuel cell testing process. At the same time, the humidifier tank is replenished with water in real time by a water pump in cooperation with a water flow regulator, so that the amount of liquid in the humidifier tank can be maintained at a certain level to ensure the accuracy of the humidity of the gas humidified by the humidifier tank. The setting of the water flow regulator can effectively control the size of the water flow from the water storage tank into the humidifier tank, thereby ensuring the stability of the water inlet at the humidifier tank, reducing the problem of water flow impact on the liquid surface inside the humidifier tank, and thus avoiding pressure fluctuations caused by water flow impact.

[0014] At the same time, since the gas needs to be humidified by 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 continue to increase. At this time, the excess pressure in the humidification tank can be relieved through the pressure relief port to ensure that the internal pressure of the humidification tank is not a problem during the detection process, thereby avoiding the possibility that the internal pressure of the humidification tank affects the humidity of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the diverter plate in the present invention.

[0017] Figure 3This is a test comparison chart between a test system using this solution and a test system not using this solution.

[0018] Figure 4 It is a schematic diagram of the power density of the fuel cell at different potentials after using the current stability assurance device of the present solution.

[0019] Figure numerals: 1. water storage tank; 2. humidification tank; 3. water pump; 4. fuel cell; 5. air outlet; 6. water flow regulating member; 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. liquid inlet main line; 16. liquid inlet branch line; 17. exhaust port. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0021] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

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

[0023] like Figure 1-Figure 4 The present invention provides an improved fuel cell system test current stability assurance device, comprising a water storage tank 1 and a humidifying tank 2, wherein the humidifying tank 2 and the water storage tank 1 are supplied with liquid via a water pump 3, and the gas outlet of the humidifying tank 2 is connected to the fuel cell 4, so that the gas with a certain humidity in the humidifying tank 2 enters the fuel cell 4 from the gas outlet 5; a water flow regulating member 6 is provided between the water pump 3 and the humidifying tank 2, and a pressure relief port 7 is provided on the side of the humidifying tank 2; When the air outlet 5 of the humidifying tank 2 is connected to the fuel cell 4 to be tested, the water pump 3 supplies the liquid in the water storage tank 1 to the humidifying tank 2 for liquid replenishment, and replenishes the gas to the humidifying tank 2, so that the gas is humidified by the liquid and then transported to the fuel cell 4 to be tested through the air outlet 5; when the pressure in the humidifying tank 2 is greater than the set pressure, the pressure relief port 7 relieves the pressure in the humidifying tank 2 until the pressure in the humidifying tank 2 drops to the set pressure.

[0024] The air outlet of the humidifier tank is connected to the fuel cell to be tested, so that the humidifier 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 stable environment during the fuel cell testing process. At the same time, the humidifier tank is replenished with water in real time through a water pump and a water flow regulator, so that the amount of liquid in the humidifier tank can be maintained at a certain level to ensure the accuracy of the humidity of the gas humidified by the humidifier tank. The setting of the water flow regulator can effectively control the size of the water flow from the water storage tank into the humidifier tank, thereby ensuring the stability of the water inlet at the humidifier tank, reducing the water flow impact problem on the liquid surface inside the humidifier tank, and avoiding pressure fluctuations caused by water flow impact.

[0025] At the same time, since the gas needs to be humidified by 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 continue to increase. At this time, the excess pressure in the humidification tank can be relieved through the pressure relief port to ensure that the internal pressure of the humidification tank is not a problem during the detection process, thereby avoiding the possibility that the internal pressure of the humidification tank affects the humidity of the gas.

[0026] The water storage tank and the water pump are connected through a water pipe, and the air outlet of the humidification tank and the fuel cell are connected through an air pipe.

[0027] In one embodiment of the present solution, the water flow regulating member is a water flow regulating valve.

[0028] Preferably, the humidifier tank 2 is provided with a water inlet 8 for connecting the water pump 3, and a diverter plate 9 is installed at the water inlet 8, the diverter plate 9 is covered at the water inlet 8, and a plurality of through holes 10 are provided on the diverter plate 9, and the plurality of through holes 10 are arranged corresponding to the water inlet 8 so that the water flow at the water inlet 8 can be diverted through the plurality of through holes 10.

[0029] Specifically, when the water pump supplies water to the humidifier tank through the water inlet, the water flows into the humidifier tank and first contacts the diverter plate. At this time, the water flow is blocked by the diverter plate, and then the water flows dispersedly from each through hole to the inside 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 the smooth effect of gas humidification.

[0030] Preferably, through grooves 11 are provided on both sides of the diverter plate 9 , and the through grooves 11 are arranged crosswise with the water inlet 8 , so that the water flow at the water inlet 8 is dispersed by the diverter plate 9 and then flows from the through grooves 11 to both sides of the diverter plate 9 .

[0031] Specifically, by setting the through grooves on both sides of the diverter plate, when the water flow at the water inlet is large, the water flow can be diverted not only through the through holes, but also through the through grooves on both sides, so that the diverter plate can still effectively divert the water flow when facing a large water flow, to ensure that the fluctuation of the water flow is reduced.

[0032] Preferably, an air inlet 12 is provided at the bottom of the humidifying tank 2 , and the humidifying tank 2 replenishes gas inside the humidifying tank 2 through the air inlet 12 .

[0033] Specifically, the humidification tank is replenished with gas through the air inlet so that the humidified gas enters the fuel cell. Since the air inlet is arranged at the bottom of the humidification tank, the gas can be fully humidified during the rising process in the humidification tank, which greatly ensures the stability of the gas humidification process.

[0034] In one embodiment of the present solution, an air pipe is provided at the air inlet, and an external air supply device is connected through the air pipe to ensure the stable air supply of the humidifier tank.

[0035] 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 .

[0036] 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 starts to control the pressure relief valve to release the pressure, so that the pressure in the humidifier tank is reduced. When the pressure in the humidifier tank is reduced to the set pressure value, the pressure controller controls the pressure relief valve to close, thereby ensuring the internal pressure balance of the humidifier tank during long-term use.

[0037] In one embodiment of the present scheme, the pressure value can be set to two types, one is the upper pressure limit value, and the other is the lower pressure limit value. When the internal pressure of the humidifier tank is greater than the upper pressure limit value, the pressure relief valve is activated, and when the internal pressure of the humidifier tank is less than the lower pressure limit value, the pressure relief valve is closed.

[0038] Preferably, the water pump 3 is connected to at least two humidification tanks 2, and a liquid inlet main line 15 is connected to one side of the water pump 3, and the liquid inlet main line 15 is connected to two liquid inlet branch lines 16 through a three-way pipe, and the liquid inlet branch lines 16 are connected to the water inlet 8 of the humidification tank 2, and the at least two humidification tanks 2 are respectively connected to the two ends of the fuel cell 4.

[0039] Specifically, the two humidification tanks are used to synchronously supply gas to both ends of the fuel cell to improve the detection efficiency and stability of the fuel cell. At the same time, a liquid inlet main line is set on one side of the water pump, and two liquid inlet branch lines are connected at the same time. The main line is used for unified liquid supply, and the liquid is distributed through the branch line to ensure the synchronous liquid replenishment effect of the two humidification tanks.

[0040] Preferably, the water flow regulating member 6 is installed at the main liquid inlet line 15 .

[0041] Specifically, since the water flow regulating component is arranged at the main liquid inlet pipeline, the water flow regulating component can uniformly regulate the water flow of the main liquid inlet pipeline, thereby ensuring the water flow size at each liquid inlet branch pipeline, without the need for separate settings at each liquid inlet branch pipeline, which can effectively reduce equipment costs.

[0042] Preferably, exhaust ports 17 are provided on both sides of the fuel cell 4 .

[0043] Specifically, excess gas in the fuel cell is discharged through the exhaust port, and moisture is replenished inside the fuel cell through the humidification tank in real time to ensure water vapor balance inside the fuel cell and avoid excessive gas pressure inside the fuel cell.

[0044] After testing, this solution can improve current stability and ensure the current fluctuation range. The test process can be referred to as follows: use two identical fuel cell test systems for testing, one of which is equipped with the current stability assurance device of this solution, and check whether the electrical circuit is connected normally. After checking, start the two test systems and connect the fuel cells to make them run for nearly 7000 seconds under exactly the same working conditions (the fuel cell temperature is constant at 80 degrees, saturated humidification, the cathode gas flow rate is 2.6L per minute, and the anode gas flow rate is 0.6L per minute), and record the fuel cell current retention rate of the two devices every second. By comparison, it is found that the device with the current stability assurance device installed is more stable than the device without the current stability assurance device in improving the stability of the current fluctuation range. After multiple experimental comparative analyses, it is concluded that the installation of the current stability assurance device plays an important role in narrowing the current fluctuation range and improving stability.

[0045] During another test of this solution, check that the components of the two fuel cell devices are connected normally to each component. The electrical system is normal. Turn on data recording. Set the operating conditions of the two fuel cell devices uniformly as follows: the fuel cell temperature is constant at 80 degrees, saturated humidification, the cathode gas flow rate is 2.6L per minute, and the anode gas flow rate is 0.6L per minute. Start the two fuel cell devices and allow the devices to reach a stable state to ensure that no abnormalities occur. Start the two fuel cell test devices in turn and let them run for 7000 seconds under the set operating conditions. During the 7000 seconds of operation of the equipment, record the current test data of the two devices every second. Compare the test data of the two devices after the equipment stops. By comparing a foreign imported fuel cell test device with a battery test device equipped with current stability assurance under the same operating conditions, it was found that the device equipped with a current stability assurance device is superior to a foreign imported device in terms of current stability. This shows that the current stability assurance device can effectively reduce current fluctuations and improve the current stability of the equipment (test comparison chart: Figure 3 ).

[0046] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. An improved fuel cell system test current stability assurance device, characterized in that: The invention comprises a water storage tank (1) and a humidifying tank (2), wherein liquid is supplied between the humidifying tank (2) and the water storage tank (1) via a water pump (3), and the gas outlet of the humidifying tank (2) is connected to the fuel cell (4), so that gas with a certain humidity in the humidifying tank (2) enters the fuel cell (4) through the gas outlet (5); a water flow regulating member (6) is arranged between the water pump (3) and the humidifying tank (2), and a pressure relief port (7) is provided on the side of the humidifying tank (2); When the gas outlet (5) of the humidifying tank (2) is connected to the fuel cell (4) to be tested, the water pump (3) supplies the liquid in the water storage tank (1) to the humidifying tank (2) for liquid replenishment, and replenishes the gas in the humidifying tank (2), so that the gas is humidified by the liquid and then transported to the fuel cell (4) to be tested through the gas outlet (5); when the pressure in the humidifying tank (2) is greater than the set pressure, the pressure relief port (7) relieves the pressure in the humidifying tank (2) until the pressure in the humidifying tank (2) drops to the set pressure; The humidifying tank (2) is provided with a water inlet (8) for connecting to a water pump (3), a diverter plate (9) is installed at the water inlet (8), the diverter plate (9) is covered at the water inlet (8), and a plurality of through holes (10) are provided on the diverter plate (9), the plurality of through holes (10) are arranged corresponding to the water inlet (8), so that the water flow at the water inlet (8) is diverted through the plurality of through holes (10); Through grooves (11) are provided on both sides of the diverter plate (9), and the through grooves (11) are arranged crosswise with the water inlet (8), so that water at the water inlet (8) is dispersed by the diverter plate (9) and then flows from the through grooves (11) to both sides of the diverter plate (9).

2. The improved fuel cell system test current stability assurance device according to claim 1, characterized in that: An air inlet (12) is provided at the bottom of the humidifying tank (2), and the humidifying tank (2) replenishes gas inside the humidifying tank (2) through the air inlet (12).

3. The improved fuel cell system test current stability assurance device according to claim 1, characterized in that: The pressure relief port (7) is connected to a pressure controller (13), and one side of the pressure controller (13) is connected to a pressure relief valve (14).

4. The improved fuel cell system test current stability assurance device according to claim 1, characterized in that: 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 tank (2), and the at least two humidification tanks (2) are respectively connected to the two ends of the fuel cell (4).

5. The improved fuel cell system test current stability assurance device according to claim 4, characterized in that: The water flow regulating member (6) is installed at the main liquid inlet channel (15).

6. The improved fuel cell system test current stability assurance device according to claim 1, characterized in that: Exhaust ports (17) are provided on both sides of the fuel cell (4).

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