Stack testing device

Abstract

The utility model provides a kind of electric pile testing device, it includes electric pile, hydrogen passage, oxygen passage and control module, hydrogen passage includes nozzle, ejector pipe, oxygen backflow pipeline and circulating pump, nozzle is used to communicate to hydrogen gas source, and it is aligned to the entrance of ejector pipe, the outlet of ejector pipe is communicated to the hydrogen inlet of electric pile, the hydrogen outlet of electric pile is communicated to the entrance of ejector pipe by oxygen backflow pipeline, circulating pump is set on oxygen backflow pipeline, oxygen passage includes air compressor, oxygen delivery pipeline and pressure relief valve, air compressor is used to communicate to oxygen gas source, the outlet of air compressor is communicated to the oxygen inlet of electric pile by oxygen delivery pipeline, pressure relief valve is set on oxygen delivery pipeline, control module is electrically connected with circulating pump, air compressor and pressure relief valve.This scheme has significantly improved the gas supply adaptability and system response capability of electric pile under different power conditions, effectively expanded the test range, met the diversified actual test demand.

Description

Technical Field

[0001] This utility model relates to fuel cells, and more particularly to a fuel cell stack testing device. Background Technology

[0002] Fuel cell systems have entered a period of large-scale development. In recent years, driven by strong national policies and driven by human desire for clean energy, fuel cell systems, as a clean energy power system, have developed rapidly.

[0003] With the rapid development of fuel cell systems, and in order to improve performance and reduce costs, the internal components are also being rapidly updated and new technologies are emerging daily. A fuel cell system generally includes a hydrogen supply system, an oxygen supply system, an electronic control system, a cooling system, and a fuel cell stack. The fuel cell stack, as a crucial part of the fuel cell system, plays a vital role and is the core component. The stack generates electricity through the reaction of air and hydrogen; its performance determines the quality of the entire fuel cell system. Therefore, a fuel cell stack test bench is designed to test the stack's performance.

[0004] Existing fuel cell stack testing systems can only meet the performance testing requirements under a single power state. Their overall structural layout cannot flexibly coordinate gas supply and circulation across a wide power range, cannot expand the effective test power range of the testing device, and cannot adjust the gas delivery and circulation rates during power switching. For example, they cannot adapt to the increased gas supply and recovery rates under high power operation, and are prone to problems such as insufficient gas ejection power leading to circulation interruption under low power operation, or output mismatch caused by the air compressor supplying oxygen exceeding the actual needs of the fuel cell stack. There is an urgent need to provide a fuel cell stack testing system that can adapt to a wider range of actual testing scenarios. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of existing fuel cell stack testing systems, which cannot coordinate gas supply and circulation over a wide power range and have a limited testable power range, and to provide a fuel cell stack testing device.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A fuel cell stack testing apparatus includes a fuel cell stack, a hydrogen passage, an oxygen passage, and a control module. The hydrogen passage includes a nozzle, an ejector tube, an oxygen return line, and a circulation pump. The nozzle is connected to a hydrogen source and aligned with the inlet of the ejector tube. The outlet of the ejector tube is connected to the hydrogen inlet of the fuel cell stack. The hydrogen outlet of the fuel cell stack is connected to the inlet of the ejector tube via the hydrogen return line. The circulation pump is located on the hydrogen return line. The oxygen passage includes an air compressor, an oxygen delivery line, and a pressure relief valve. The air compressor is connected to an oxygen source. The outlet of the air compressor is connected to the oxygen inlet of the fuel cell stack via the oxygen delivery line. The pressure relief valve is located on the oxygen delivery line. The control module is electrically connected to the circulation pump, the air compressor, and the pressure relief valve.

[0008] In this scheme, the structural layout of the hydrogen and oxygen pathways is optimized to ensure that the hydrogen and oxygen delivery volumes in both pathways are compatible with fuel cell stacks operating at high power. Specifically, when the fuel cell stack operates at higher power, the hydrogen pathway uses a nozzle connected to the hydrogen source and positioned towards the inlet of the ejector tube to eject hydrogen from the hydrogen return line, thereby pressurizing the return hydrogen and meeting the high-flow-rate hydrogen demand of the fuel cell stack under high-power operation. Meanwhile, the oxygen pathway, through a control module that closes the pressure relief valve, ensures that the oxygen output from the air compressor is fully delivered to the fuel cell stack, meeting the high-flow-rate oxygen demand of the fuel cell stack under high-power operation. When the fuel cell stack operates at lower power, the demand for hydrogen and oxygen decreases. For the hydrogen pathway, the hydrogen flow rate delivered from the hydrogen source to the ejector tube through the nozzle is insufficient to meet the ejection conditions for hydrogen from the hydrogen return line to flow into the ejector tube. Therefore, the control module activates the circulation pump to provide power to help the hydrogen in the hydrogen return line circulate. For the oxygen pathway, when the fuel cell stack's oxygen demand is less than the lower limit of the air compressor's supply capacity, the control module opens the pressure relief valve to discharge excess oxygen, ensuring the air compressor's supply meets the demand. The structural design scheme proposed for the fuel cell stack testing device, by optimizing the hydrogen and oxygen pathway layout and introducing corresponding control strategies, significantly improves the fuel cell stack's gas supply adaptability and system response capability under different power conditions. This scheme not only achieves stable and efficient operation of the fuel cell stack over a wide power range but also effectively expands the upper and lower limits of the testing device's power testing, enhancing its overall testing flexibility and coverage. This structural design meets diverse practical testing needs, providing a more comprehensive and reliable experimental basis for fuel cell stack performance evaluation and system verification.

[0009] Preferably, the oxygen passage further includes a first oxygen flow meter and a second oxygen flow meter. The first oxygen flow meter is used to detect the flow rate in the pipe section where the pressure relief valve is located, and the second oxygen flow meter is used to detect the flow rate in the pipe section where the air compressor outlet is located. The first oxygen flow meter and the second oxygen flow meter are electrically connected to the control module.

[0010] In this design, a first oxygen flow meter and a second oxygen flow meter are installed on different sections of the oxygen supply line to monitor the flow rate in the bypass section where the pressure relief valve is located and the flow rate in the main pipeline section where the air compressor outlet is located. Specifically, the first oxygen flow meter is used to obtain the bypass flow rate, and the second oxygen flow meter is used to obtain the main flow rate. Both are electrically connected to the control module, which can calculate the actual oxygen intake of the fuel cell stack based on the difference between the main and bypass flow rates, thereby achieving precise monitoring of the oxygen delivery volume.

[0011] Preferably, the fuel cell stack testing device further includes a first cooling water passage and a second cooling water passage with independent pipes, wherein the first cooling water passage is used at least to cool the fuel cell stack, and the second cooling water passage is used to cool the air compressor.

[0012] In this design, to improve system cooling efficiency and ensure reliable operation of critical components, a separate second cooling water path is added in addition to the first cooling water path (used for fuel cell stack cooling), specifically for cooling the air compressor. This design effectively isolates thermal interference between the two cooling circuits, preventing a decrease in cooling capacity or temperature fluctuations caused by sharing a water path. The independent operation of the second cooling water path provides stable and sufficient cooling conditions for the air compressor, thereby ensuring that it maintains good thermal management performance and operational reliability over a wide output flow range.

[0013] Preferably, the upper limit of the operating power range of the fuel cell stack is greater than or equal to 350kW.

[0014] Preferably, the lower limit of the operating power range of the fuel cell stack is less than or equal to 30kW.

[0015] In this scheme, the upper limit of the operating power range of the fuel cell stack of the fuel cell stack test device is greater than or equal to 350kW, while the lower limit is less than or equal to 30kW, so as to provide a large power adjustment range for the fuel cell stack and meet the actual testing requirements.

[0016] Preferably, the fuel cell stack testing device further includes a test bench, on which the fuel cell stack, the hydrogen passage, and the oxygen passage are all arranged.

[0017] In this design, the integrated arrangement of the fuel cell stack, hydrogen supply path, and oxygen supply path on the test bench significantly enhances the system's operability and testing convenience. This layout not only facilitates the installation, connection, and routine maintenance of each component but also enables efficient compatibility and rapid switching testing of fuel cell stacks across different power ranges. The overall solution enhances the adaptability and scalability of the test platform, fully meeting the systematic verification needs of fuel cell stack performance under multiple power ranges and operating conditions.

[0018] Preferably, the hydrogen passage further includes a first hydrogen delivery pipeline, and the nozzle is connected to the hydrogen source through the first hydrogen delivery pipeline; wherein, the hydrogen passage further includes a first thermometer and / or a first pressure gauge, the first thermometer and / or the first pressure gauge is disposed on the first hydrogen delivery pipeline, and the first thermometer and / or the first pressure gauge is electrically connected to the control module.

[0019] Preferably, the hydrogen passage further includes a hydrogen inlet solenoid valve, which is disposed on the first hydrogen delivery pipeline and is electrically connected to the control module.

[0020] Preferably, the hydrogen passage further includes a hydrogen filter, which is disposed on the first hydrogen delivery pipeline.

[0021] Preferably, the hydrogen passage further includes a hydrogen flow meter, which is installed on the first hydrogen delivery pipeline and is electrically connected to the control module.

[0022] In this scheme, by installing a hydrogen flow meter in the hydrogen passage, the hydrogen flow rate can be monitored in real time during system testing, and the data can be fed back to the control system to achieve precise adjustment and process monitoring of hydrogen supply, thereby ensuring the stable and efficient operation of the fuel cell stack under different operating conditions.

[0023] Preferably, the fuel cell stack testing device further includes a first heat exchanger and a first cooling water passage, wherein the first heat exchanger is disposed on the first hydrogen delivery pipeline of the hydrogen passage, and the second heat exchanger is disposed on the first cooling water passage.

[0024] Preferably, the hydrogen passage further includes a one-way valve, which is disposed on the first hydrogen delivery pipeline.

[0025] Preferably, the hydrogen passage further includes a hydrogen source solenoid valve and / or a hydrogen source ball valve, the hydrogen source solenoid valve and / or the hydrogen source ball valve being disposed on the first hydrogen delivery pipeline, and the hydrogen source solenoid valve being electrically connected to the control module.

[0026] Preferably, the upstream of the first hydrogen delivery pipeline is also used to connect to a nitrogen source, so as to deliver nitrogen to the first hydrogen delivery pipeline through the nitrogen source to purge the hydrogen passage.

[0027] In this scheme, nitrogen is supplied to the first hydrogen delivery pipeline via a nitrogen gas source for purging. Utilizing the inert properties of nitrogen, residual hydrogen in the pipeline is safely replaced and diluted, thereby completely eliminating the significant risk of an explosive atmosphere formed by hydrogen mixing with air. This operation is not only a crucial measure to ensure personal and equipment safety during equipment maintenance, system shutdown, or startup, but also effectively prevents air from entering the system. Therefore, while ensuring process safety, it also plays a vital role in protecting sensitive equipment, maintaining process stability, and guaranteeing the quality of the final product.

[0028] Preferably, the hydrogen passage further includes a second hydrogen delivery pipeline, and the outlet of the ejector tube is connected to the hydrogen inlet of the fuel cell stack through the second hydrogen delivery pipeline.

[0029] Preferably, the hydrogen passage further includes a second thermometer and / or a second pressure gauge, the second thermometer and / or the second pressure gauge being disposed on the second hydrogen delivery pipeline, and the second thermometer and / or the second pressure gauge being electrically connected to the control module.

[0030] Preferably, the hydrogen passage further includes a hydrogen reflux pipeline, through which the hydrogen outlet of the fuel cell stack is connected to the pumping inlet of the circulation pump; wherein, the hydrogen passage further includes a third pressure gauge, which is disposed on the hydrogen reflux pipeline and is electrically connected to the control module.

[0031] Preferably, the hydrogen passage further includes a vapor-water separation mechanism and a fourth pressure gauge. The vapor-water separation mechanism is disposed on the hydrogen return pipeline, and the fourth pressure gauge is disposed on the vapor-water separation mechanism. The fourth pressure gauge is electrically connected to the control module.

[0032] Preferably, the oxygen passage further includes a humidifier, the dry side of which is disposed on the oxygen delivery pipeline and located upstream of the pressure relief valve; the oxygen passage further includes a sixth thermometer and / or a sixth pressure gauge, the sixth thermometer and / or the sixth pressure gauge being disposed on the oxygen delivery pipeline and located upstream of the pressure relief valve, and the sixth thermometer and / or the sixth pressure gauge being electrically connected to the control module.

[0033] In this solution, by installing pressure gauges on various pipelines and connecting them to the control module, high-precision real-time monitoring and intelligent closed-loop control of the medium state within the pipelines are achieved. Its core effect lies in providing the system with critical process parameter sensing capabilities. By continuously collecting temperature and pressure data, the control module can dynamically evaluate the system's operating status and compare it with preset safety thresholds and process parameters. Once an abnormal parameter is detected, the system can immediately trigger an early warning, effectively avoiding equipment failure or safety risks caused by uncontrolled operating conditions.

[0034] Preferably, the oxygen passage further includes an oxygen inlet solenoid valve, which is disposed on the oxygen delivery pipeline and located downstream of the pressure relief valve, and is electrically connected to the control module; wherein, the oxygen passage further includes a fifth thermometer and / or a fifth pressure gauge and / or a fifth hygrometer, which is disposed on the oxygen delivery pipeline and located downstream of the oxygen inlet solenoid valve, and is electrically connected to the control module.

[0035] Preferably, the fuel cell stack testing device further includes a second heat exchanger and a first cooling water passage, wherein the first heat exchange end of the second heat exchanger is disposed on the oxygen delivery pipe of the oxygen passage, and the second heat exchange end of the second heat exchanger is disposed on the first cooling water passage.

[0036] Preferably, the oxygen passage further includes a humidifier, the wet side of which is disposed on the oxygen return pipeline and located upstream of the circulation pump; wherein, the oxygen passage further includes a seventh thermometer and / or a seventh pressure gauge and / or a seventh hygrometer, the seventh thermometer and / or the seventh pressure gauge and / or the seventh hygrometer being disposed on the oxygen return pipeline and located upstream of the humidifier, and the seventh thermometer and / or the seventh pressure gauge and / or the seventh hygrometer being electrically connected to the control module.

[0037] The positive and progressive effects of this utility model are as follows:

[0038] This fuel cell stack testing device optimizes the structural layout of the hydrogen and oxygen pathways, enabling the hydrogen and oxygen delivery volumes of the pathways to be compatible with fuel cell stacks with a wide power range. Specifically, by optimizing the layout of the hydrogen and oxygen pathways and introducing corresponding control strategies, it significantly improves the gas supply adaptability and system response capability of the fuel cell stack under different power operating conditions.

[0039] Meanwhile, this fuel cell stack testing device not only achieves stable and efficient operation of the fuel cell stack over a wide power range, but also effectively expands the upper and lower limits of the power testing range, enhancing its overall testing flexibility and coverage. This structural design meets diverse practical testing needs, providing a more comprehensive and reliable experimental foundation for fuel cell stack performance evaluation and system verification. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the system structure of the fuel cell stack testing device according to Embodiment 1 of this utility model.

[0041] Figure 2 This is a schematic diagram of the system structure of the hydrogen passage in Embodiment 1 of this utility model.

[0042] Figure 3 This is a schematic diagram of the oxygen pathway system structure of Embodiment 1 of this utility model.

[0043] Figure 4 This is a schematic diagram of the structure of the fuel cell stack testing device according to Embodiment 1 of this utility model.

[0044] Figure 5 This is a schematic diagram of the nitrogen purging system of Embodiment 1 of this utility model.

[0045] Explanation of reference numerals in the attached figures

[0046] fuel cell stack testing device 100

[0047] fuel cell stack 1

[0048] Hydrogen pathway 2

[0049] Nozzle 201

[0050] ejector tube 202

[0051] Hydrogen reflux line 203

[0052] Circulating pump 2031

[0053] First hydrogen transmission pipeline 204

[0054] First thermometer 205

[0055] First pressure gauge 206

[0056] Hydrogen inlet solenoid valve 207

[0057] Hydrogen filter 208

[0058] Hydrogen source ball valve 209

[0059] Hydrogen source solenoid valve 210

[0060] Hydrogen flow meter 211

[0061] Second hydrogen delivery pipeline 214

[0062] Second thermometer 215

[0063] Second pressure gauge 216

[0064] Third pressure gauge 2

[0065] Gas-water separator 218

[0066] Fourth pressure gauge 219

[0067] Oxygen pathway 3

[0068] Air compressor 301

[0069] Oxygen delivery pipeline 302

[0070] Pressure relief valve 303

[0071] First oxygen flow meter 304

[0072] Second oxygen flow meter 305

[0073] Oxygen inlet solenoid valve 306

[0074] Humidifier 310

[0075] Sixth Thermometer 311

[0076] Sixth pressure gauge 312

[0077] Seventh Thermometer 313

[0078] Seventh pressure gauge 314

[0079] Second cooling water passage 6

[0080] Test bench 7

[0081] Nitrogen source 8 Detailed Implementation

[0082] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0083] Example 1

[0084] like Figure 1 As shown, this embodiment provides a fuel cell stack testing device 100, which includes a fuel cell stack 1, a hydrogen passage 2, an oxygen passage 3, a cooling passage, and a control module. The fuel cell stack 1, the hydrogen passage 2, and the oxygen passage 3 are all arranged on a test bench 7 for easy operation.

[0085] The system structure diagram of the fuel cell stack testing device 100 is shown below. Figure 2 As shown, by optimizing the hydrogen pathway ( Figure 3 ) and oxygen pathway ( Figure 4 The layout of the stack was improved, and corresponding control strategies were introduced, which significantly improved the gas supply adaptability and system response capability of the stack 1 under different power conditions.

[0086] like Figure 3 and Figure 4 As shown, the fuel cell stack testing device 100 includes a fuel cell stack 1, a hydrogen passage 2, an oxygen passage 3, and a control module. Figure 3 The structure of hydrogen pathway 2 is shown, and Figure 4 The structural improvements of oxygen pathway 3 are shown.

[0087] like Figure 3 As shown, the hydrogen passage 2 includes a nozzle 201, an ejector tube 202, a hydrogen return line 203, and a circulation pump 2031. The nozzle 201 is used to connect to an external hydrogen source and is aligned with the inlet of the ejector tube 202. The outlet of the ejector tube 202 is connected to the hydrogen inlet of the fuel cell stack 1. The hydrogen outlet of the fuel cell stack 1 is connected to the inlet of the ejector tube 202 through the hydrogen return line 203. The circulation pump 2031 is installed on the hydrogen return line 203.

[0088] like Figure 4 As shown, the oxygen passage 3 includes an air compressor 301, an oxygen delivery pipeline 302, and a pressure relief valve 303. The air compressor 301 is used to connect to an external oxygen source. The outlet of the air compressor 301 is connected to the oxygen inlet of the fuel cell stack 1 through the oxygen delivery pipeline 302. The pressure relief valve 303 is located in the oxygen delivery pipeline 302. The control module is electrically connected to the circulation pump 2031, the air compressor 301, and the pressure relief valve 303.

[0089] In this embodiment, by optimizing the structural layout of hydrogen passage 2 and oxygen passage 3, the hydrogen and oxygen delivery rates of hydrogen passage 2 and oxygen passage 3 are made compatible with the high-power range of fuel cell stack 1. Specifically, when the fuel cell stack 1 is operating at a higher power, the hydrogen passage 2 uses a nozzle 201 connected to the hydrogen source and positioned towards the inlet of the ejector tube 202 to eject hydrogen from the hydrogen return line 203, thereby pressurizing the return hydrogen and meeting the high-flow-rate hydrogen demand of the fuel cell stack 1 under high-power operation. Meanwhile, the oxygen passage 3 closes the pressure relief valve 303 through the control module, ensuring that the oxygen output from the air compressor 301 can be fully delivered to the fuel cell stack 1, meeting the high-flow-rate oxygen demand of the fuel cell stack 1 under high-power operation. When the fuel cell stack 1 is operating at a lower power, the demand for hydrogen and oxygen decreases. For the hydrogen passage 2, the flow rate of hydrogen delivered from the hydrogen source to the ejector tube 202 through the nozzle 201 is less than that, which is insufficient to meet the ejection conditions for the hydrogen in the hydrogen return line 203 to flow to the ejector tube 202. Therefore, the control module controls the circulation pump 2031 to start, providing power to help the hydrogen in the hydrogen return line 203 complete circulation. For oxygen passage 3, when the oxygen demand of fuel cell stack 1 is less than the lower limit of the air supply capacity provided by air compressor 301, the control module opens pressure relief valve 303 to discharge excess oxygen, ensuring that the air compressor 301 supplies enough oxygen to meet the demand. The structural design scheme proposed for the fuel cell stack testing device 100, by optimizing the layout of hydrogen and oxygen passages 3 and introducing corresponding control strategies, significantly improves the gas supply adaptability and system response capability of fuel cell stack 1 under different power conditions. This scheme not only achieves stable and efficient operation of fuel cell stack 1 over a wide power range but also effectively expands the upper and lower limits of the power testing of the testing device, enhancing its overall testing flexibility and coverage. This structural design meets diverse practical testing needs, providing a more comprehensive and reliable experimental basis for the performance evaluation and system verification of fuel cell stack 1.

[0090] In this embodiment, the hydrogen passage 2 includes a first hydrogen delivery pipeline 204, a second hydrogen delivery pipeline 214, and a hydrogen return pipeline 203. The nozzle 201 is connected to a hydrogen source through the first hydrogen delivery pipeline 204. The hydrogen passage 2 also includes a first thermometer 205, a first pressure gauge 206, a hydrogen inlet solenoid valve 207, a hydrogen filter 208, and a hydrogen flow meter 211. The first thermometer 205, the first pressure gauge 206, the hydrogen inlet solenoid valve 207, the hydrogen filter 208, and the hydrogen flow meter 211 are mounted on the first hydrogen delivery pipeline 204. Pressure gauge 206, hydrogen inlet solenoid valve 207, and hydrogen flow meter 211 are electrically connected to the control module. In addition, the testing device includes a first heat exchanger and a first cooling water passage. The first heat exchange end of the first heat exchanger is located on the first hydrogen delivery pipeline 204 of the hydrogen passage 2. The first hydrogen delivery pipeline 204 is also equipped with a check valve, a hydrogen source solenoid valve 210, and a hydrogen source ball valve 209. The hydrogen source solenoid valve 210 is also electrically connected to the control module. The second heat exchange end of the first heat exchanger is located on the first cooling water passage. The first heat exchanger connects the first hydrogen delivery pipeline 204 and the first cooling water passage. Furthermore, a nitrogen source 8 is connected upstream of the first hydrogen delivery pipeline 204. Nitrogen can be supplied to the hydrogen passage 2 through the first hydrogen delivery pipeline 204 for purging. Utilizing the inert properties of nitrogen, residual hydrogen in the pipeline is safely replaced and diluted, thereby completely eliminating the significant risk of hydrogen mixing with air to form an explosive atmosphere. The second hydrogen delivery pipeline 214 connects to the outlet of the ejector tube 202 and delivers the hydrogen output from the ejector tube 202 to the hydrogen inlet of the fuel cell stack 1. The second hydrogen delivery pipeline 214 is also equipped with a second thermometer 215 and a second pressure gauge 216, which are electrically connected to the control module. The hydrogen return pipeline 203 is used to recover the hydrogen remaining in the fuel cell stack 1 after the reaction. The hydrogen return pipeline 203 is equipped with a third pressure gauge 217 and a gas-liquid separation mechanism 218. The third pressure gauge 217 is used to monitor the pressure of the gas in the hydrogen return pipeline 203.

[0091] In this embodiment, in the hydrogen passage 2, hydrogen flows from the hydrogen source into the first hydrogen delivery pipeline 204, passes through the hydrogen source ball valve 209 and the hydrogen source solenoid valve 210, and then flows through the first heat exchanger located on the first heat exchange end of the first heat exchanger on the first hydrogen delivery pipeline 204. The first heat exchanger regulates the temperature of the water delivered into the hydrogen passage 2 through the temperature exchange of the first cooling water passage. Further, the hydrogen flows through the hydrogen flow meter 211, which can monitor the expected hydrogen flow into the nozzle 201 for easy operation and monitoring. Next, the hydrogen flows into the hydrogen filter 208, and the filtered hydrogen flows through the first thermometer 205 and the first pressure gauge 206, and enters the hydrogen inlet solenoid valve 207, and is further delivered to the nozzle 201. The nozzle 201 sprays the hydrogen into the ejector tube 202, and then delivers it to the hydrogen inlet of the fuel cell stack 1, and is then controlled by the second thermometer. The pressure gauge 215 and the second pressure gauge 216 detect relevant values. After the hydrogen reacts in the fuel cell stack 1, it is recovered through the hydrogen return pipeline 203 and enters the circulation pump 2031. The circulation pump 2031 is equipped with a vapor-water separation mechanism 218, and the vapor-water separation mechanism 218 is also equipped with a fourth pressure gauge 219 to monitor the pressure of the returned hydrogen. The returned hydrogen is transported to the outlet of the nozzle 201 through the hydrogen return pipeline 203, and the collected returned hydrogen is output. It is then sprayed again into the ejector tube 202 through the nozzle 201, enters the second hydrogen delivery pipeline, and is then transported to the fuel cell stack 1 for reaction. When the test is over, the nitrogen source 8 will deliver nitrogen to the hydrogen passage 2 through the first hydrogen delivery pipeline 204 to purge, safely replacing and diluting the residual hydrogen in the pipeline, thereby completely eliminating the huge risk of hydrogen mixing with air to form an explosive atmosphere.

[0092] The oxygen passage 3 is equipped with a first oxygen flow meter 304, a second oxygen flow meter 305, and a humidifier 310. The first oxygen flow meter 304 is used to detect the flow rate of the pipe section where the pressure relief valve 303 is located, and the second oxygen flow meter 305 is used to detect the flow rate of the pipe section where the outlet of the air compressor 301 is located. The first oxygen flow meter 304 and the second oxygen flow meter 305 are electrically connected to the control module. The dry side of the humidifier 310 is located on the oxygen delivery pipeline 302 and upstream of the pressure relief valve 303. The wet side of the humidifier 310 is located on the oxygen return pipeline and upstream of the circulating pump 2031. The oxygen delivery pipeline 302 also includes a sixth thermometer 311 and a sixth pressure gauge 312, located upstream of the pressure relief valve 303 and electrically connected to the control module. The oxygen delivery pipeline 302 also includes an oxygen inlet solenoid valve 306, a fifth thermometer, a fifth pressure gauge, and a fifth hygrometer. The oxygen inlet solenoid valve 306 is located downstream of the pressure relief valve 303, and the fifth thermometer, fifth pressure gauge, and fifth hygrometer are located downstream of the oxygen inlet solenoid valve 306 and electrically connected to the control module. The oxygen delivery pipe of the oxygen passage 3 also includes a first heat exchange end of a second heat exchanger, and the second heat exchange end of the second heat exchanger is connected to a first cooling water passage for regulating the temperature of the gas in the oxygen delivery pipe. The oxygen return pipeline includes a seventh thermometer 313, a seventh pressure gauge 314, and a seventh hygrometer, located upstream of the humidifier 310 and electrically connected to the control module.

[0093] In this embodiment, oxygen flows from the hydrogen delivery pipeline through the first oxygen flow meter 304, which can read the oxygen flow rate through this section of the pipeline. Then it enters the air compressor 301 and flows through the second heat exchanger located on the second heat exchange end of the oxygen delivery pipeline. It then flows through the pipeline where the humidifier 310 is located, and at the same time flows to the pressure relief valve 303 and the fuel cell stack 1. The excess oxygen from the reaction of the fuel cell stack 1 flows back into the humidifier 310 through the oxygen return pipeline and is discharged through the return pipeline.

[0094] The fuel cell stack testing device 100 is also provided with a first cooling water passage and a second cooling water passage 6 with independent pipes. The first cooling water passage is used to cool the fuel cell stack 1, and the second cooling water passage 6 is used to cool the air compressor 301.

[0095] In this embodiment, the upper limit of the operating power range of the fuel cell stack 1 is 350kW, and the lower limit is 30kW.

[0096] In other embodiments, the operating power range of the fuel cell stack 1 can exceed 30kW to 350kW to accommodate different testing requirements, which will not be elaborated here.

[0097] Example 2

[0098] This embodiment also provides a fuel cell stack testing device 100, whose structure is largely the same as that of the fuel cell stack testing device 100 in Embodiment 1. The difference is that in this embodiment, the hydrogen passage 2 only has a second thermometer 215 and a second pressure gauge 216. A third thermometer is also provided on the hydrogen passage 2, which is located on the hydrogen return pipeline 203 and electrically connected to the control module. A fourth thermometer is also provided, which is located on the gas-liquid separation mechanism 218. The oxygen passage 3 only has a fifth thermometer, a fifth pressure gauge, a seventh thermometer 313, and a seventh pressure gauge 314, which are electrically connected to the control module. The fuel cell stack testing device 100 also has a cooling system, which is connected to the oxygen circuit.

[0099] In other embodiments, pressure gauges, thermometers, and hygrometers, or other equipment required for testing data detection, may be added or removed from oxygen passage 3 and hydrogen passage 2 as needed for experimental monitoring to achieve the best testing results. Further details are omitted here.

[0100] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A fuel cell stack testing device, comprising a fuel cell stack, a hydrogen passage, an oxygen passage, and a control module, characterized in that, The hydrogen passage includes a nozzle, an ejector tube, a hydrogen return line, and a circulation pump. The nozzle is connected to a hydrogen source and aligned with the inlet of the ejector tube. The outlet of the ejector tube is connected to the hydrogen inlet of the fuel cell stack. The hydrogen outlet of the fuel cell stack is connected to the inlet of the ejector tube via the hydrogen return line. The circulation pump is located on the hydrogen return line. The oxygen passage includes an air compressor, an oxygen delivery line, and a pressure relief valve. The air compressor is connected to an oxygen source. The outlet of the air compressor is connected to the oxygen inlet of the fuel cell stack via the oxygen delivery line. The pressure relief valve is located on the oxygen delivery line. The control module is electrically connected to the circulation pump, the air compressor, and the pressure relief valve.

2. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The oxygen passage also includes a first oxygen flow meter and a second oxygen flow meter. The first oxygen flow meter is used to detect the flow rate in the pipe section where the pressure relief valve is located, and the second oxygen flow meter is used to detect the flow rate in the pipe section where the air compressor outlet is located. The first oxygen flow meter and the second oxygen flow meter are electrically connected to the control module.

3. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The fuel cell stack testing device further includes a first cooling water passage and a second cooling water passage with independent pipes. The first cooling water passage is used to cool the fuel cell stack at least, and the second cooling water passage is used to cool the air compressor.

4. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The upper limit of the operating power range of the fuel cell stack is greater than or equal to 350kW; And / or, the lower limit of the operating power range of the fuel cell stack is less than or equal to 30 kW.

5. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The fuel cell stack testing device also includes a test bench, on which the fuel cell stack, the hydrogen passage, and the oxygen passage are all arranged.

6. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The hydrogen passage also includes a first hydrogen delivery pipeline, and the nozzle is connected to the hydrogen source through the first hydrogen delivery pipeline; The hydrogen passage further includes a first thermometer and / or a first pressure gauge, which is disposed on the first hydrogen delivery pipeline and is electrically connected to the control module. And / or, the hydrogen passage further includes a hydrogen inlet solenoid valve, which is disposed on the first hydrogen delivery pipeline and is electrically connected to the control module; And / or, the hydrogen passage further includes a hydrogen filter, which is disposed on the first hydrogen delivery pipeline; And / or, the hydrogen passage further includes a hydrogen flow meter, which is installed on the first hydrogen delivery pipeline and is electrically connected to the control module; And / or, the fuel cell stack testing device further includes a first heat exchanger and a first cooling water passage, wherein the first heat exchanger is disposed on the first hydrogen delivery pipeline of the hydrogen passage, and the second heat exchanger is disposed on the first cooling water passage. And / or, the hydrogen passage further includes a one-way valve, which is disposed on the first hydrogen delivery pipeline; And / or, the hydrogen passage further includes a hydrogen source solenoid valve and / or a hydrogen source ball valve, the hydrogen source solenoid valve and / or the hydrogen source ball valve being disposed on the first hydrogen delivery pipeline, and the hydrogen source solenoid valve being electrically connected to the control module; And / or, the upstream of the first hydrogen delivery pipeline is also used to connect to a nitrogen source, so as to deliver nitrogen to the first hydrogen delivery pipeline through the nitrogen source to purge the hydrogen passage.

7. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The hydrogen passage also includes a second hydrogen delivery pipeline, through which the outlet of the ejector tube is connected to the hydrogen inlet of the fuel cell stack. The hydrogen passage further includes a second thermometer and / or a second pressure gauge, which is installed on the second hydrogen delivery pipeline and is electrically connected to the control module.

8. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The hydrogen passage also includes a hydrogen return pipeline, through which the hydrogen outlet of the fuel cell stack is connected to the pumping inlet of the circulation pump. The hydrogen passage also includes a third pressure gauge, which is installed on the hydrogen return pipeline and is electrically connected to the control module. And / or, the hydrogen passage further includes a vapor-water separation mechanism and a fourth pressure gauge, the vapor-water separation mechanism being disposed on the hydrogen return pipeline, the fourth pressure gauge being disposed on the vapor-water separation mechanism, and the fourth pressure gauge being electrically connected to the control module.

9. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The oxygen passage also includes an oxygen inlet solenoid valve, which is installed on the oxygen delivery pipeline and located downstream of the pressure relief valve. The oxygen inlet solenoid valve is electrically connected to the control module. The oxygen passage further includes a fifth thermometer and / or a fifth pressure gauge and / or a fifth hygrometer. The fifth thermometer and / or the fifth pressure gauge and / or the fifth hygrometer are disposed on the oxygen delivery pipeline and located downstream of the oxygen inlet solenoid valve. The fifth thermometer and / or the fifth pressure gauge and / or the fifth hygrometer are electrically connected to the control module. And / or, the oxygen passage further includes a humidifier, the dry side of which is disposed on the oxygen delivery pipeline and located upstream of the pressure relief valve; The oxygen passage also includes a sixth thermometer and / or a sixth pressure gauge, which is installed on the oxygen delivery pipeline and located upstream of the pressure relief valve. The sixth thermometer and / or the sixth pressure gauge is electrically connected to the control module. And / or, the fuel cell stack testing apparatus further includes a second heat exchanger and a first cooling water passage, wherein the first heat exchange end of the second heat exchanger is disposed on the oxygen delivery pipe of the oxygen passage, and the second heat exchange end of the second heat exchanger is disposed on the first cooling water passage.

10. The fuel cell stack testing apparatus as described in claim 1, characterized in that, The oxygen passage also includes a humidifier, the wet side of which is located on the oxygen return line and upstream of the circulation pump; The oxygen passage further includes a seventh thermometer and / or a seventh pressure gauge and / or a seventh hygrometer. The seventh thermometer and / or the seventh pressure gauge and / or the seventh hygrometer are disposed on the oxygen return pipeline and located upstream of the humidifier. The seventh thermometer and / or the seventh pressure gauge and / or the seventh hygrometer are electrically connected to the control module.

Images