CN213071187U

CN213071187U - Testing device for air-cooled fuel cell stack

Info

Publication number: CN213071187U
Application number: CN202021770784.3U
Authority: CN
Inventors: 李传祥; 杨凯; 陆维; 耿珺; 胡皓然; 魏刚
Original assignee: Spic Hydrogen Energy Technology Development Co Ltd
Current assignee: Jinan Lvdong Hydrogen Energy Technology Co ltd; Spic Hydrogen Energy Technology Development Co Ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-04-27
Anticipated expiration: 2030-08-21

Abstract

The embodiment of the utility model provides a testing arrangement for air-cooled type fuel cell pile, include: the hydrogen gas generator comprises a plurality of hydrogen pipelines, a plurality of purging pipelines, a plurality of fans, a plurality of loads, a plurality of voltage detectors, a plurality of internal resistance meters and a plurality of polling meters. Each hydrogen pipeline can be communicated with a hydrogen source, the plurality of hydrogen pipelines can be communicated with the plurality of fuel cell stacks in a one-to-one correspondence mode, and each hydrogen pipeline is sequentially provided with a first reducing valve, a first switch valve and a gas detector. Each purging pipeline can be communicated with a purging gas source, the plurality of purging pipelines can be communicated with the plurality of fuel cell stacks in a one-to-one correspondence mode, and each purging pipeline is provided with a second reducing valve and a third switch valve. The utility model provides a this testing arrangement has characteristics such as efficiency of software testing is high, factor of safety is high, measuring result is comprehensive, measurement accuracy.

Description

Testing device for air-cooled fuel cell stack

Technical Field

The utility model relates to a fuel cell field specifically, relates to a testing arrangement for air-cooled type fuel cell pile.

Background

A fuel cell stack is a power generation device that converts chemical energy of hydrogen into electric energy, and has been widely used in many fields in recent years due to its advantages of no pollution, low operating temperature, low noise, and the like. Fuel cell stacks are classified into an air cooling type and a water cooling type according to a heat radiation manner. Among them, the air-cooled fuel cell stack has been widely used in many fields due to its small size, and especially has been paid attention to by researchers in recent years in the application to unmanned aerial vehicles.

The current, voltage, the temperature and internal resistance of the fuel cell stack, the flow, temperature and pressure of hydrogen and other physical parameters in the operation process of the air-cooled fuel cell stack have important influences on the normal operation and power generation efficiency of the fuel cell stack. However, most of the related arts are directed to performance measurement of water-cooled fuel cell stacks, and few researches on test devices of air-cooled fuel cell stacks are involved. In addition, in the related art, a testing device for an air-cooled fuel cell stack generally can only test one fuel cell stack at a time, which causes complicated measuring steps and low efficiency.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a testing apparatus for an air-cooled fuel cell stack.

According to the utility model discloses a testing arrangement for air-cooled type fuel cell pile, include: the hydrogen gas pipeline comprises a plurality of hydrogen pipelines, a first pressure reducing valve, a first switch valve and a gas detector, wherein each hydrogen pipeline can be communicated with a hydrogen source, the hydrogen pipelines can be communicated with a plurality of fuel cell stacks in a one-to-one correspondence mode, each hydrogen pipeline is sequentially provided with a first pressure reducing valve, a first switch valve and a gas detector, and the gas detector comprises a flow meter, a temperature detector, a pressure detector which can be positioned at the upstream of the fuel cell stacks and a pressure detector which can be positioned at the downstream of the fuel cell stacks; each purging pipeline can be communicated with a purging gas source, the purging pipelines can be communicated with the fuel cell stacks in a one-to-one correspondence mode, and each purging pipeline is provided with a second reducing valve and a third switch valve; a plurality of fans for radiating heat to the plurality of fuel cell stacks in a one-to-one correspondence; a plurality of loads for electrically connecting a plurality of the fuel cell stacks in a one-to-one correspondence; a plurality of voltage detectors electrically connected to the plurality of loads in one-to-one correspondence; a plurality of internal resistance meters for electrically connecting a plurality of the fuel cell stacks in a one-to-one correspondence; and a plurality of data detectors electrically connected to the plurality of fuel cell stacks in a one-to-one correspondence.

According to the utility model discloses a testing arrangement for air-cooled type fuel cell pile, through setting up a plurality of hydrogen pipelines and a plurality of pipelines that purge to not only can carry out performance test to a plurality of air-cooled type fuel cell piles simultaneously, especially can carry out performance test to a plurality of air-cooled type fuel cell piles that have different power simultaneously, the efficiency of software testing of air-cooled type fuel cell pile has been improved, and can blow off remaining hydrogen in the air-cooled type fuel cell pile, so that measured security performance has been improved.

And, according to the utility model discloses a testing arrangement for air-cooled fuel cell pile, through setting up a plurality of loads, a plurality of voltage detector, a plurality of internal resistance appearance and a plurality of appearance of patrolling and examining, thereby can measure and calculate the voltage of reacing each air-cooled fuel cell pile under different electric currents, power density, the average voltage of battery, maximum voltage and corresponding battery position, minimum voltage and corresponding battery position, the voltage of every piece battery, the pile internal resistance, so that test air-cooled fuel cell pile more comprehensively, and then obtain the best running condition of air-cooled fuel cell pile.

According to the utility model discloses a testing arrangement for air-cooled type fuel cell pile is through setting up the gas detection ware to can make the test to air-cooled type fuel cell pile go on under the same condition, can go on under the unchangeable condition of temperature, flow and the pressure that can hydrogen in keeping the hydrogen pipeline, so that improve the accuracy of test.

Therefore, the utility model discloses a testing arrangement for air-cooled fuel cell galvanic pile has characteristics such as efficiency of software testing is high, factor of safety is high, measuring result is comprehensive, measurement accuracy.

In addition, according to the utility model discloses a testing arrangement still has following additional technical characterstic:

in some embodiments, the hydrogen supply system further comprises a plurality of first filters, the plurality of first filters are arranged on the plurality of hydrogen pipelines in a one-to-one correspondence, and the first filters are positioned at the upstream of the first pressure reducing valves; and the second filters are arranged on the purging pipelines in a one-to-one correspondence mode, and the second filters are positioned at the upstream of the second pressure reducing valve.

In some embodiments, a second on-off valve is provided on each of the hydrogen lines, the second on-off valve being located downstream of the gas detector.

In some embodiments, further comprising: a plurality of fourth switching valves, which are arranged on the plurality of hydrogen gas pipelines in a one-to-one correspondence manner, and are positioned at the upstream of the first reducing valve; the fifth switch valves are arranged on the hydrogen pipelines in a one-to-one correspondence mode, and are positioned at the downstream of the second switch valves; and the sixth switching valves are arranged on the plurality of purging pipelines in a one-to-one correspondence mode, and are positioned at the upstream of the second reducing valve.

In some embodiments, each of the first, second, and third on-off valves is a pneumatic ball valve, and each of the fourth, fifth, and sixth on-off valves is a ball valve.

In some embodiments, a hydrogen concentration detector for detecting a concentration of hydrogen in the environment is further included.

In some embodiments, the first portion of the plurality of hydrogen gas circuits is a first pipe segment, the first pipe segment is provided with a fourth switch valve, a first filter and the first pressure reducing valve, the first filter is positioned downstream of the fourth switch valve, and the first pressure reducing valve is positioned downstream of the first filter; and/or the first part of the plurality of purging pipelines is a second pipe section, a sixth switch valve, a second filter and a second pressure reducing valve are arranged on the second pipe section, the second filter is positioned at the downstream of the sixth switch valve, and the second pressure reducing valve is positioned at the downstream of the second filter.

In some embodiments, a plurality of the purging lines are connected to a plurality of the hydrogen lines in a one-to-one correspondence, a connection of the purging line to the hydrogen line is located downstream of the first switching valve, and a connection of the purging line to the hydrogen line is located upstream of the gas detector.

In some embodiments, the hydrogen supply system further comprises a plurality of emptying pipelines, the emptying pipelines are connected with the hydrogen pipelines in a one-to-one correspondence mode, each emptying pipeline is provided with a seventh switch valve, the connection position of the emptying pipeline and the hydrogen pipeline is located at the downstream of the first pressure reducing valve, and the connection position of the emptying pipeline and the hydrogen pipeline is located at the upstream of the first switch valve.

In some embodiments, the fuel cell system further comprises a plurality of temperature detectors for detecting the temperatures of a plurality of the fuel cell stacks in a one-to-one correspondence.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural diagram of a testing apparatus for an air-cooled fuel cell stack according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A test apparatus 100 for an air-cooled fuel cell stack according to an embodiment of the present invention is described below with reference to the drawings.

As shown in fig. 1, the testing apparatus 100 for an air-cooled fuel cell stack according to an embodiment of the present invention includes a plurality of hydrogen pipelines 4, a plurality of purging pipelines 5, a plurality of fans, a plurality of loads, a plurality of voltage detectors, a plurality of internal resistance meters, and a plurality of polling meters.

Each hydrogen pipe 4 can communicate with a hydrogen source, and the plurality of hydrogen pipes 4 can communicate with the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence, so as to input hydrogen required for operation into the air-cooled fuel cell stacks 14. Each hydrogen pipeline 4 is provided with a first pressure reducing valve 11, a first switch valve 12 and a gas detector in sequence. That is, the hydrogen gas piping 4 is provided with a first pressure reducing valve 11, a first opening/closing valve 12, and a gas detector in this order in the flow direction of hydrogen gas.

Each hydrogen conduit 4 is capable of communicating with a source of hydrogen gas by: when the testing device 100 is in use, each hydrogen pipeline 4 is in communication with a hydrogen source; when the testing device 100 is not in use, each hydrogen conduit 4 may or may not be in communication with a hydrogen source. The plurality of hydrogen gas pipes 4 can be communicated with the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence manner: when the testing device 100 is in a use state, the plurality of hydrogen pipelines 4 are communicated with the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence manner; when the testing apparatus 100 is not in use, the plurality of hydrogen pipes 4 may be in communication with the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence, or may not be in communication with the air-cooled fuel cell stacks 14.

The gas detector includes a flow meter 131, a temperature detector 132, a pressure detector (i.e., a first pressure detector 133 in fig. 1) that can be located upstream of the air-cooling type fuel cell stack 14, and a pressure detector (i.e., a second pressure detector 134 in fig. 1) that can be located downstream of the air-cooling type fuel cell stack 14. The flow meter 131 is used to measure the flow rate of hydrogen in the hydrogen gas pipe 4, the temperature detector 132 is used to measure the temperature of hydrogen in the hydrogen gas pipe 4, the first pressure detector 133 is used to measure the pressure of hydrogen before entering the air-cooled fuel cell stack 14, and the second pressure detector 134 is used to measure the pressure of hydrogen flowing out of the air-cooled fuel cell stack 14.

The "upstream" and "downstream" are determined according to the direction of flow of gas in the hydrogen gas pipe 4, for example, hydrogen gas flows in the hydrogen gas pipe 4, first passes through the first pressure detector 133 that can be located upstream of the air-cooled fuel cell stack 14, then flows through the air-cooled fuel cell stack 14, and then flows through the second pressure detector 134 that can be located downstream of the air-cooled fuel cell stack 14. The pressure detector that can be located upstream of the air-cooling type fuel cell stack 14 refers to: when the testing apparatus 100 is in use, the air-cooled fuel cell stack 14 is in communication with the hydrogen gas line 4, and the first pressure detector 133 is located upstream of the air-cooled fuel cell stack 14; when the testing apparatus 100 is not in use, the air-cooled fuel cell stack 14 may or may not be in communication with the hydrogen gas line 4, and then the first pressure detector 133 may or may not be located upstream of the air-cooled fuel cell stack 14. The pressure detector that can be located downstream of the air-cooled fuel cell stack 14 refers to: when the testing device 100 is in the use state, the air-cooled fuel cell stack 14 is communicated with the hydrogen pipeline 4, and the second pressure detector 134 is located downstream of the air-cooled fuel cell stack 14; when the testing apparatus 100 is not in use, the air-cooled fuel cell stack 14 may or may not be in communication with the hydrogen gas line 4, and then the second pressure detector 134 may or may not be located downstream of the air-cooled fuel cell stack 14.

Each purge line 5 can be communicated with a purge gas source, a plurality of purge lines 5 can be communicated with a plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence manner, and a second reducing valve 21 and a third on-off valve 22 are arranged on each purge line 5. The purge line 5 is used to purge the air-cooled fuel cell stack 14 before and after operation, and to blow out the hydrogen remaining in the air-cooled fuel cell stack 14, thereby improving the operation safety. Each purge line 5 being able to communicate with a source of purge gas means: when the testing device 100 is in use, each purge line 5 is in communication with a source of purge gas; each purge line 5 may or may not be in communication with a source of purge gas when the test apparatus 100 is not in use.

A plurality of fans (not shown in the figure) are used to radiate heat from the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence. The air-cooled fuel cell stack 14 generates heat during operation, which causes the temperature of the stack to increase continuously, and therefore a fan is required to dissipate the heat of the stack. In addition, the fan can supply air required for operation, i.e., air that reacts with hydrogen to generate electric power, to the air-cooled fuel cell stack 14.

A plurality of loads (not shown in the figure) are used to electrically connect the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence. A plurality of voltage detectors (not shown in the figure) are used to electrically connect with a plurality of loads in a one-to-one correspondence. A plurality of internal resistance meters (not shown in the figure) are used to electrically connect the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence. A plurality of polling instruments (not shown in the drawings) are used to electrically connect the plurality of air-cooled fuel cell stacks 14 in a one-to-one correspondence.

The load is used to regulate the current applied to the air-cooled fuel cell stack 14 corresponding thereto. The voltage detector is used for measuring the voltage of the load air-cooling type fuel cell stack 14 corresponding to the voltage detector (electrically connected with the voltage detector), and the current flowing through the load can be obtained according to the voltage and the resistance of the load corresponding to the voltage detector, namely the current of the air-cooling type fuel cell stack 14 corresponding to the load.

The internal resistance meter is used for measuring the internal resistance of the air-cooled fuel cell stack 14 corresponding thereto. The polling instrument is electrically connected with each cell of the air-cooled fuel cell stack 14 corresponding to the polling instrument, namely, a lead is led out from each cell of the air-cooled fuel cell stack 14, the cells and the leads are numbered according to the installation sequence of the cells in the stack, and each lead is connected to the polling instrument. The polling instrument can thus poll the voltage of each cell in the air-cooled fuel cell stack 14, measure the voltage of each cell, and calculate the average voltage. The patrol instrument can also find out the position of the battery corresponding to the highest voltage and the position of the battery corresponding to the lowest voltage and the lowest voltage through the serial number.

In addition, parameters such as voltage, power density and the like of the air-cooled fuel cell stack under different currents can be obtained by loading different currents.

The test apparatus 100 shown in fig. 1 includes three hydrogen gas lines 4 and three purge lines 5 so that three air-cooled fuel cell stacks 14 can be tested simultaneously. In other embodiments, the testing device 100 of the present invention may include n hydrogen gas lines 4 and n purge lines 5, so as to be able to test n air-cooled fuel cell stacks 14 simultaneously.

As shown in fig. 1, each hydrogen line 4 is provided with a gas detector. Only one of the gas detectors on one of the hydrogen gas conduits 4 is labeled separately in fig. 1, it being understood that the gas detectors on the other two hydrogen gas conduits 4 can be of the same type and location as the gas detectors on that one of the hydrogen gas conduits 4. Taking the hydrogen gas line 4 located uppermost in fig. 1 as an example, the flow meter 131 is located upstream of the temperature detector 132, the temperature detector 132 is located upstream of the first pressure sensor 133, the first pressure sensor 133 is located upstream of the air-cooling type fuel cell stack 14, and the air-cooling type fuel cell stack 14 is located upstream of the second pressure sensor 134. The flow meter 131, the temperature detector 132, and the first pressure sensor 133 can measure the flow rate, the temperature, and the pressure, respectively, of the hydrogen gas before entering the air-cooling type fuel cell stack 14. The second pressure sensor 134 may measure the pressure of the hydrogen gas flowing out of the air-cooling type fuel cell stack 14.

In some embodiments, the testing device 100 of the present invention may further include a control system. The air flow detector, the air-cooled fuel cell stack 14, the fan, the voltage detector, the internal resistance instrument and the polling instrument can be connected with the control system. The control system can control the switching and operation of the various elements. And the data measured by each element can be displayed by a display terminal of the control system. The control system and the control method thereof can adopt the prior related technology, and are not described in detail here. Optionally, the control system is a PLC system.

In some embodiments, the purge lines 5 are connected to the hydrogen lines 4 in a one-to-one correspondence. The connection of the purge line 5 to the hydrogen line 4 is downstream of the first switching valve 12 and upstream of the gas detector. The purpose of this arrangement is to increase the distance over which the purge gas flows through the hydrogen line 4 during purging, and to purge as many elements on the hydrogen line 4 and the hydrogen line 4 as possible, thereby improving the purging effect.

In some embodiments, the testing device 100 of embodiments of the present invention further comprises a plurality of first filters 15 and a plurality of second filters 23. A plurality of first filters 15 are provided on the plurality of hydrogen gas pipes 4 in one-to-one correspondence, the first filters 15 being located upstream of the first pressure reducing valve 11. That is, with respect to the first filter 15 and the first pressure reducing valve 11 provided on the same hydrogen gas line 4, the first filter 15 is located upstream of the first pressure reducing valve 11. The first filter 15 is used to filter the hydrogen gas entering the hydrogen gas pipeline 4, to filter out impurities, dust and the like in the hydrogen gas, and to prevent the impurities and dust from entering the downstream air-cooled fuel cell stack 14 and causing adverse effects thereon.

The plurality of second filters 23 are provided on the plurality of purge lines 5 in one-to-one correspondence, and the second filters 23 are located upstream of the second pressure reducing valve 21. That is, with respect to the second filter 23 and the second pressure reducing valve 21 provided on the same purge line 5, the second filter 23 is located upstream of the second pressure reducing valve 21. The second filter 23 is used for filtering the purge gas entering the purge line 5, filtering out impurities, dust and the like in the purge gas, and preventing the impurities and dust from entering the downstream air-cooled fuel cell stack 14 to cause adverse effects thereon.

In some embodiments, a second on-off valve 16 is provided on each hydrogen gas conduit 4, the second on-off valve 16 being located downstream of the gas detector. Since the gas detector includes the second pressure detector 134, the second switching valve 16 is located downstream of the second pressure detector 134, and thus when the air-cooled fuel cell stack 14 is tested using the testing apparatus 100, the second switching valve 16 is located downstream of the air-cooled fuel cell stack 14.

The second switching valve 16 is used to stabilize the hydrogen pressure in the hydrogen line 4 and the air-cooled fuel cell stack 14. For example, when hydrogen gas is introduced, the first pressure reducing valve 11 and the first on-off valve 12 are opened and the second on-off valve 16 is closed, after a certain period of time of gas introduction, the second on-off valve 16 is opened to exhaust gas, and after a certain period of gas exhaust, the second on-off valve 16 is closed, and thus the circulation operation is performed. Closing the second on-off valve 16 facilitates the diffusion of hydrogen in the air-cooled fuel cell stack 14 to ensure the stabilization of the pressure in the hydrogen line 4, and by opening the second on-off valve 16, the hydrogen in the air-cooled fuel cell stack 14 can be discharged

In some embodiments, the testing apparatus 100 for an air-cooled fuel cell stack according to an embodiment of the present invention further includes a plurality of fourth switching valves 17, a plurality of fifth switching valves 18, and a plurality of sixth switching valves 24. A plurality of fourth switching valves 17 are provided on the plurality of hydrogen gas lines 4 in one-to-one correspondence, the fourth switching valves 17 being located upstream of the first pressure reducing valve 11. A plurality of fifth switching valves 18 are provided on the plurality of hydrogen gas pipes 4 in one-to-one correspondence, the fifth switching valves 18 being located downstream of the second switching valves 16. The sixth switching valves 24 are provided on the purge lines 5 in a one-to-one correspondence, and the sixth switching valves 24 are located upstream of the second reducing valve 21.

That is, with respect to the fourth switching valve 17, the first pressure reducing valve 11, the fifth switching valve 18, and the second switching valve 16 provided on the same hydrogen gas line 4, the fourth switching valve 17 is located upstream of the first pressure reducing valve 11, and the fifth switching valve 18 is located downstream of the second switching valve 16; with respect to the sixth switching valve 24 and the second pressure reducing valve 21 provided on the same purge line 5, the sixth switching valve 24 is located upstream of the second pressure reducing valve 21.

When the test device 100 is powered off and the second switch valve 16 is opened, the hydrogen pipeline 4 can be cut off from the outside by closing the fifth switch valve 18. Thereby preventing the gas and impurities in the external environment from being back-injected into the hydrogen pipeline 4 to pollute the air-cooled fuel cell stack 14. When one hydrogen pipeline 4 is stopped (for example, after the test is finished, a fault occurs, and the like), the fourth switch valve 17 can be closed to cut off the communication between the hydrogen source and the hydrogen pipeline 4, and the sixth switch valve 24 can be closed to cut off the communication between the purging gas source and the hydrogen pipeline 4, so that the use of the other hydrogen pipelines 4 and the purging pipeline 5 is not influenced.

Optionally, the fourth on-off valve 17 is located upstream of the respective first filter 15 and the sixth on-off valve 24 is located upstream of the respective second filter 23.

In some embodiments, each of the first, second, and third on-off

valves

12, 16, and 22 is a pneumatic ball valve, and each of the fourth, fifth, and sixth on-off valves 17, 18, and 24 is a ball valve. That is, each of the first, second, and

third switching valves

12, 16, and 22 is an automatic valve, and each of the fourth, fifth, and sixth switching valves 17, 18, and 24 is a manual valve. Each of the first switching valve 12, the second switching valve 16, and the third switching valve 22 is connected to a control system as shown in fig. 1, that is, the control system can control the switching state of each of the first switching valve 12, the second switching valve 16, and the third switching valve 22.

Further, the utility model discloses testing arrangement 100 includes a plurality of blow-down pipelines 6, and a plurality of blow-down pipelines 6 one-to-one links to each other with a plurality of hydrogen gas pipeline 4, is equipped with seventh ooff valve 61 on every blow-down pipeline 6. Wherein the connection of the emptying pipeline 6 and the hydrogen pipeline 4 is positioned at the downstream of the first pressure reducing valve 11, and the connection of the emptying pipeline 6 and the hydrogen pipeline 4 is positioned at the upstream of the first switch valve 12. The vent line 6 is used for venting and decompressing the hydrogen gas pipeline 4, and when the test device 100 is used and the gas in the pipeline needs to be exhausted, the seventh switch valve 61 can be opened to exhaust the gas in the pipeline.

Further, the testing apparatus 100 of the embodiment of the present invention further includes a plurality of temperature detectors (not shown in the figure) for detecting the temperatures of the plurality of fuel cell stacks in a one-to-one correspondence. The temperature detector is connected with the corresponding fuel cell stack and can detect the temperature of the fuel cell stack. The temperature detector for detecting the temperature of the fuel cell stack can adopt the scheme in the prior art, and the detailed description is omitted.

Optionally, a plurality of the temperature detectors are connected with the control system, and the temperature data obtained by testing can be displayed on a display terminal of the computer terminal.

Further, the testing device 100 of the embodiment of the present invention includes a hydrogen concentration detector (not shown in the figure) for detecting the hydrogen concentration in the environment. The hydrogen concentration detector is used to detect the hydrogen concentration in the environment around the test apparatus 100, preventing explosion due to too high hydrogen concentration. The hydrogen concentration detector can have an alarm function, a preset value is set before operation, and when the hydrogen concentration reaches the preset value, the hydrogen concentration detector can send out an alarm signal. The hydrogen concentration detector may also be connected to the control system. When the hydrogen concentration reaches a preset value, the control system receives a signal of the hydrogen concentration detector, the test can be forcibly ended, and the purging function is started.

As an example, as shown in fig. 1, the plurality of hydrogen gas lines 4 converge into the same pipe section on the side communicating with the hydrogen gas source, which pipe section may be referred to as a first pipe section 41, and the first pressure reducing valve 11 is provided on this first pipe section 41. As can be understood from the structure shown in fig. 1, each of the plurality of hydrogen gas conduits 4 includes the first pipe section 41.

In other words, the first portion of the plurality of hydrogen gas conduits 4 is the first pipe section 41, i.e., the plurality of hydrogen gas conduits 4 share the first pipe section 41. The first pipe section 41 is provided with a fourth switch valve 17, a first filter 15 and a first pressure reducing valve 11, the first filter 15 is positioned at the downstream of the fourth switch valve 17, and the first pressure reducing valve 11 is positioned at the downstream of the first filter 15. Thus, the plurality of hydrogen gas lines 4 can share the fourth switching valve 17, the first filter 15, and the first pressure reducing valve 11, so that the number of the fourth switching valve 17, the first filter 15, and the first pressure reducing valve 11 can be reduced, thereby simplifying the structure of the test apparatus 100 and reducing the manufacturing cost of the test apparatus 100.

The remaining portion (i.e., the portion other than the first portion) of each hydrogen gas pipe 4 may be provided with the first on-off valve 12, the gas detector, the second on-off valve 16, and the fifth on-off valve 18, i.e., the first on-off valve 12, the gas detector, the second on-off valve 16, and the fifth on-off valve 18 are not provided on the first pipe section 41.

Each of the hydrogen gas lines 4 includes a third pipe section 42 (branch pipe section) connected to the first pipe section 41 (total pipe section), and a plurality of the third pipe sections 42 can be connected to the plurality of air-cooling type fuel cell stacks 14 in one-to-one correspondence. Each third pipe section 42 is provided with the first on-off valve 12, the flow meter 131, the temperature detector 132, the first pressure detector 133, the air-cooling type fuel cell stack 14, and the second pressure detector. The hydrogen gas enters the first pipe section 41 from the hydrogen source, flows through the fourth switching valve 17, the first filter 15 and the first pressure reducing valve 11 in sequence, is divided, and the divided hydrogen gas enters each third pipe section 42. The hydrogen gas flows through the first on-off valve 12, the flow meter 131, the temperature detector 132, and the first pressure detector 133 in the third pipe section 42, respectively, and then enters the air-cooled fuel cell stack 14.

In some embodiments, a third pressure relief valve (not shown) is further included, and is located between the temperature detector 132 and the first pressure detector 133. The third pressure reducing valve is used to ensure that the inlet pressure of each third pipe section 42 is a preset value, for example, the third pressure reducing valve is used to ensure that the inlet pressure of each third pipe section 42 is 0.7 bar. The third pressure reducing valve may be configured to enable a difference between the inlet pressure and the outlet pressure of the flow meter 131 to be a preset value, for example, when the pressure difference between the inlet and the outlet of the flow meter 131 needs to be 3bar, the third pressure reducing valve may be adjusted.

As an example, as shown in fig. 1, the plurality of hydrogen gas lines 4 converge into the same pipe section on the side communicating with the hydrogen gas source, which pipe section may be referred to as a second pipe section 51, and the second pressure reducing valve 21 is provided on this second pipe section 51. As will be understood from the structure shown in fig. 1, each of the plurality of purge lines 5 includes the second pipe section 51.

In other words, the first portion of the plurality of purge lines 5 is the second pipe section 51, i.e. the plurality of purge lines 5 share the second pipe section 51. The second pipe section 51 is provided with a sixth on-off valve 24, a second filter 23 and a second pressure reducing valve 21, the second filter 23 is located downstream of the sixth on-off valve 24, and the second pressure reducing valve 21 is located downstream of the second filter 23. Thereby, the plurality of purge lines 5 can share one sixth switching valve 24, one second filter 23, and one second pressure reducing valve 21, so that the number of sixth switching valves 24, second filters 23, and second pressure reducing valves 21 can be reduced, so that the structure of the test apparatus 100 can be simplified, and the manufacturing cost of the test apparatus 100 can be reduced.

The remaining portion (i.e., the portion other than the first portion) of each purge line 5 may be provided with the third on/off valve 22, i.e., the third on/off valve 22 is not provided on the first pipe segment 41.

Each of the purge lines 5 includes a fourth pipe section 52 (branch pipe section) connected to the second pipe section 51 (total pipe section), and the plurality of fourth pipe sections 52 can be connected to the plurality of third pipe sections 42 in a one-to-one correspondence. Each fourth pipe section 52 is provided with a third on/off valve 22. The purge gas enters the second pipe section 51 from the purge gas source, and after flowing through the sixth switching valve 24, the second filter 23 and the second pressure reducing valve 21 in sequence, the purge gas is divided, and the divided purge gas enters each fourth pipe section 52. The purge gas enters the third pipe section 42 after the third on/off valve 22 in the fourth pipe section 52. Optionally, the connection of the fourth pipe segment 52 to the third pipe segment 42 is downstream of the first switching valve 12 and upstream of the gas detector. While the fourth pipe segment 52 is shown interrupted in fig. 1, the three connections A, B, C in the figure each indicate the position of the interruption, it will be appreciated that the fourth pipe segment 52 may be of similar communication configuration to the third pipe segment 42. Optionally, the purge gas is nitrogen.

By way of example, as shown in FIG. 1, the testing device 100 includes a vent line 6, the vent line 6 being in communication with the first pipe section 41. That is to say, the venting line 6 is realized in connection with each of the three hydrogen lines 4. The emptying pipeline 6 is provided with a seventh switch valve 61. Wherein the connection of the vent line 6 to the first pipe segment 41 is located downstream of the first pressure reducing valve 11, and the connection of the vent line 6 to the first pipe segment 41 is located upstream of the first switching valve 12. In other embodiments, the venting lines 6 can be connected to the third section 42 of the hydrogen line 4 in a one-to-one correspondence, and can also be used for venting.

As shown in fig. 1, the connection of the vent line 6 to the first pipe section 41 is located upstream of the first switching valve 12. The connection of the purging line 5 to the hydrogen line 4 is downstream of the first switching valve 12, that is to say the connection of the emptying line 6 to the first tube section 41 is upstream of the connection of the purging line 5 to the hydrogen line 4. The purge line 5 is capable of purging hydrogen in the downstream of the first on-off valve 12, and the vent line 6 is capable of discharging hydrogen in the upstream of the first on-off valve 12 out of the hydrogen line 4. The following will describe the operation of the testing apparatus 100 for an air-cooled fuel cell stack according to the present invention, taking the testing apparatus 100 shown in fig. 1 as an example. Nitrogen was chosen as the purge gas. The three hydrogen lines 4 are referred to as a first hydrogen line, a second hydrogen line and a third hydrogen line, respectively. The three purging pipelines 5 are respectively called a first purging pipeline, a second purging pipeline and a third purging pipeline, the first purging pipeline is connected with the first hydrogen pipeline, the second purging pipeline is connected with the second hydrogen pipeline, and the third purging pipeline is connected with the third hydrogen pipeline. The terminal of the control system can be provided with various operation buttons, such as a purging start button, a purging end button, a hydrogen gas introduction button and a hydrogen gas end button, and the like, and can be designed according to requirements in the actual operation process.

Before the start of the measurement, the decompression pressures of the first decompression valve 11 and the second decompression valve 21 were adjusted to 0.5 MPa. The fourth switching valve 17, the sixth switching valve 24, and the three fifth switching valves 18 are opened manually.

The flow rate of the flow meter 131 was set to 2.5L/min. The second on-off valve 16 on the first hydrogen line and the third on-off valve 22 on the first purge line are opened by the control system. The nitrogen enters the hydrogen pipeline 4 to start purging, and after a preset time (for example, 60s) of purging, the control system closes the second on-off valve 16 on the first hydrogen pipeline and the third on-off valve 22 on the first purging pipeline. The first on-off valve 12 on the first hydrogen line is in a closed state throughout the purging process.

The second hydrogen line and the third hydrogen line may be purged separately as described above. And the purge time and the like can be set according to actual needs. During the purging, the first on-off valve 12 on the hydrogen gas line 4 undergoing purging should be in a closed state.

After purging is finished, the first hydrogen pipeline is opened through the control system, the first switch valve 12 and the second switch valve 16 on the first hydrogen pipeline are opened through the control system, hydrogen starts to be introduced, and after the first switch valve 12 and the second switch valve 16 are opened for a certain time, the control system controls the first switch valve 12 and the second switch valve 16 to be closed. This process is referred to as a pre-start of the first hydrogen line.

After the pre-start is finished, the control system opens the first switch valve 12 on the first hydrogen pipeline again, and the second switch valve 16 on the first hydrogen pipeline is in a closed state. After the hydrogen gas is continuously fed for a period of time, the control system opens the second switch valve 16 on the first hydrogen pipeline for exhausting. After a certain time of exhaust, the second on-off valve 16 on the first hydrogen line is closed again. After the hydrogen is continuously fed for a period of time, the control system opens the second switch valve 16 on the first hydrogen pipeline again for exhausting, and the circulation is carried out.

The second hydrogen line and the third hydrogen line can be fed with hydrogen according to the above-described procedure. And the opening and closing time of the first and

second switching valves

12 and 16 can be preset according to actual conditions.

After the measurement technology, a measurement ending button on the control system is clicked, and the control system can automatically close the first switch valve 12 and start a purging process to purge each hydrogen pipeline 4.

The following describes an alarm process when the testing device 100 generates an overpressure phenomenon, taking the first hydrogen pipeline as an example.

For example, the normal pressure in the first hydrogen line is 0.2Mpa, and the upper limit of the first pressure sensor 132 may be set to 0.3Mpa in advance.

When the pressure in the first hydrogen pipeline reaches or exceeds 0.3Mpa, the first pressure sensor 132 sends out an alarm signal, and after the control system receives the alarm signal, the control system controls the first switch valve 12 on the first hydrogen pipeline to be closed and the second switch valve 18 to be opened. I.e. cutting off the path for the hydrogen to continue into the first hydrogen line and venting the first hydrogen line.

When the pressure drops to 0, the first pressure sensor 132 sends a signal to the control system, which closes the second on-off valve 18 on the first hydrogen line. The staff member can then close the hydrogen source valve and the first pressure reducing valve 11 and start looking for the cause of the overpressure.

The overpressure alarming process in the second hydrogen pipeline and the third hydrogen pipeline is the same.

The first hydrogen pipeline is taken as an example to describe the alarm process when the over-temperature phenomenon occurs in the testing device 100. For example, the normal temperature of the air-cooled fuel cell stack 14 in the first hydrogen line is 20 ℃ to 30 ℃, and the upper limit of the temperature detector for detecting the temperature of the air-cooled fuel cell stack 14 may be set in advance to 40 ℃. When the temperature detector displays that the temperature of the air-cooled fuel cell stack 14 reaches or exceeds 25 ℃, the temperature detector 1 sends a signal, and after receiving the signal, the control system controls the fan frequency conversion control system in the air-cooled fuel cell stack 14 to start the fan, and the fan frequency conversion control system can automatically increase or decrease the output power of the fan according to the temperature.

If the internal temperature of the air-cooled fuel cell stack 14 is too high, the full power output of the fan cannot be reduced, and the temperature exceeds the maximum limit of 40 ℃. The temperature detector will send out an alarm signal, and the control system will close the first switch valve 12 and the second switch valve 18 on the first hydrogen pipeline after receiving the alarm signal. The fan frequency conversion control system continues full power output until the internal temperature of the air-cooled fuel cell stack 14 is reduced to 25 ℃. The staff member can then close the hydrogen source valve and the first pressure reducing valve 11 and start looking for the cause of the overpressure.

The overtemperature alarm process of the second hydrogen pipeline and the third hydrogen pipeline is the same.

The following describes the alarm process when the test apparatus 100 has an excessive ambient hydrogen concentration. For example, the second highest concentration of hydrogen gas is set to 25%, the highest concentration to 50%, where the% is volume fraction. When the hydrogen concentration in the environment reaches 25%, the hydrogen concentration detector starts to give an alarm, and an operator can stop measuring and check a leakage point. If the measurement cannot be stopped under special conditions, the test can be continued, but if the hydrogen concentration reaches the maximum value of 50%, the hydrogen concentration detector alarms again and sends an alarm signal to the control system. The control system may force the measurement to end and automatically initiate the purge function.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A testing apparatus for an air-cooled fuel cell stack, comprising:

each hydrogen pipeline can be communicated with a hydrogen source, the hydrogen pipelines can be communicated with a plurality of air-cooling type fuel cell stacks in a one-to-one correspondence mode, a first pressure reducing valve, a first switch valve and a gas detector are sequentially arranged on each hydrogen pipeline, and each gas detector comprises a flow meter, a temperature detector, a pressure detector capable of being located at the upstream of the air-cooling type fuel cell stacks and a pressure detector capable of being located at the downstream of the air-cooling type fuel cell stacks; and

each purging pipeline can be communicated with a purging gas source, the purging pipelines can be communicated with the air-cooled fuel cell stacks in a one-to-one correspondence mode, and each purging pipeline is provided with a second reducing valve and a third switch valve;

a plurality of fans for radiating heat of the air-cooled fuel cell stacks in a one-to-one correspondence;

a plurality of loads for electrically connecting a plurality of the air-cooled fuel cell stacks in a one-to-one correspondence;

a plurality of voltage detectors electrically connected to the plurality of loads in one-to-one correspondence;

a plurality of internal resistance meters for electrically connecting the plurality of air-cooled fuel cell stacks in a one-to-one correspondence; and

and the plurality of polling instruments are electrically connected with the plurality of air-cooled fuel cell electric stacks in a one-to-one correspondence manner.

2. The test apparatus for an air-cooled fuel cell stack according to claim 1, characterized by further comprising:

the first filters are arranged on the hydrogen pipelines in a one-to-one correspondence mode, and are positioned at the upstream of the first pressure reducing valve; and

and the second filters are arranged on the plurality of purging pipelines in a one-to-one correspondence mode, and are positioned at the upstream of the second pressure reducing valve.

3. The testing device for the air-cooled fuel cell stack according to claim 1, wherein a second switching valve is provided on each of the hydrogen pipes, the second switching valve being located downstream of the gas detector.

4. The test apparatus for an air-cooled fuel cell stack according to claim 3, characterized by further comprising:

a plurality of fourth switching valves, which are arranged on the plurality of hydrogen gas pipelines in a one-to-one correspondence manner, and are positioned at the upstream of the first reducing valve;

the fifth switch valves are arranged on the hydrogen pipelines in a one-to-one correspondence mode, and are positioned at the downstream of the second switch valves; and

and the sixth switching valves are arranged on the plurality of purging pipelines in a one-to-one correspondence mode, and are positioned at the upstream of the second reducing valve.

5. The testing device for the air-cooled fuel cell stack according to claim 4, wherein each of the first, second, and third switching valves is a pneumatic ball valve, and each of the fourth, fifth, and sixth switching valves is a ball valve.

6. The testing device for the air-cooled fuel cell stack according to claim 1, further comprising a hydrogen concentration detector for detecting a hydrogen concentration in an environment.

7. The test apparatus for an air-cooled fuel cell stack according to claim 1,

the first part of the plurality of hydrogen pipelines is a first pipe section, a fourth switch valve, a first filter and the first pressure reducing valve are arranged on the first pipe section, the first filter is positioned at the downstream of the fourth switch valve, and the first pressure reducing valve is positioned at the downstream of the first filter; and/or

The first part of a plurality of purging pipelines is a second pipe section, a sixth switch valve, a second filter and a second pressure reducing valve are arranged on the second pipe section, the second filter is located at the downstream of the sixth switch valve, and the second pressure reducing valve is located at the downstream of the second filter.

8. The testing device for the air-cooled fuel cell stack according to claim 1, wherein a plurality of the purge lines are connected to a plurality of the hydrogen lines in a one-to-one correspondence, a connection of the purge line to the hydrogen line is located downstream of the first switching valve, and a connection of the purge line to the hydrogen line is located upstream of the gas detector.

9. The testing device for the air-cooled fuel cell stack according to claim 1, further comprising a plurality of emptying pipes, the emptying pipes are connected with the hydrogen pipes in a one-to-one correspondence, each emptying pipe is provided with a seventh switch valve, wherein the connection position of the emptying pipe and the hydrogen pipe is located at the downstream of the first pressure reducing valve, and the connection position of the emptying pipe and the hydrogen pipe is located at the upstream of the first switch valve.

10. The test apparatus for an air-cooled fuel cell stack according to claim 1, further comprising a plurality of temperature detectors for detecting temperatures of a plurality of the air-cooled fuel cell stacks in a one-to-one correspondence.