CN112304532A

CN112304532A - Fuel cell air tightness detection device and detection method

Info

Publication number: CN112304532A
Application number: CN202011354803.9A
Authority: CN
Inventors: 杨琦; 卢兵兵; 侯中军; 姜峻岭; 陈沛
Original assignee: Shanghai Jieqing Technology Co Ltd
Current assignee: Shanghai Jieqing Technology Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-02-02
Anticipated expiration: 2040-11-27
Also published as: CN112304532B

Abstract

The application discloses fuel cell gas tightness check out test set and detection method, wherein, fuel cell gas tightness check out test set can cooperate through the state adjustment of pipeline selection module flowmeter, first pressure sensor and second pressure sensor realize that single chamber leaks the test outward, two chambeies are scurry the test each other and equipment self-checking and self-calibration, realize the function of automatic operation and self-checking self-calibration, in addition, fuel cell gas tightness check out test set still includes the pressure release module, possesses automatic pressure release function, guarantees the whole safe operation of equipment. In addition, the fuel cell air tightness detection equipment also has the characteristics of small size, light weight and strong adaptability to use environment.

Description

Fuel cell air tightness detection device and detection method

Technical Field

The application relates to the technical field of fuel cells, in particular to fuel cell airtightness detection equipment and a detection method.

Background

A proton exchange membrane fuel cell (hereinafter referred to as a fuel cell) is a new type of fuel cell, the electrolyte of which is a solid organic membrane, the exchange membrane of which can conduct protons in the case of humidification. The fuel cell is considered to be a new energy power generation system which is intensively developed in the future due to the advantages of environmental friendliness, high energy conversion rate, no noise, quick response and the like.

In order to make the assembled fuel cell stack be put into normal use, the air tightness of the stack must be detected.

However, how to measure the stack gas tightness quickly and accurately is always a difficult point after the fuel cell stack is assembled.

Disclosure of Invention

In order to solve the technical problems, the application provides fuel cell airtightness detection equipment and a detection method, so as to achieve the purpose of providing the fuel cell airtightness detection equipment with the functions of automatic operation, self-detection self-calibration and safe pressure relief.

In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:

a fuel cell gas tightness detecting apparatus for measuring a stack gas tightness of a fuel cell, the fuel cell gas tightness detecting apparatus comprising: the system comprises a gas input module, a first pressure sensor, a pipeline selection module, a second pressure sensor, a flowmeter and a pressure relief module; wherein,

the gas input module is connected with the pipeline selection module and used for providing test gas for the pipeline selection module;

the first pressure sensor is arranged at the joint of the gas input module and the pipeline selection module;

the pipeline selection module comprises a plurality of switch units, the switch units form an emptying branch, a first gas supply branch, a second gas supply branch and a third gas supply branch, the second pressure sensor and the flowmeter are arranged on the emptying branch, and the first gas supply branch, the second gas supply branch and the third gas supply branch are respectively connected with a hydrogen cavity, a water cavity and a cavity of the pile;

the pressure relief module is used for relieving pressure of the pipeline selection module when the pressure of the test gas exceeds a preset value;

the pipeline selection module further comprises a first state, a second state and a third state, when the pipeline selection module is in the first state, the switch units form a single-cavity test loop so as to cooperate with the second pressure sensor and the flowmeter to perform single-cavity leakage test; when the pipeline selection module is in a second state, the switch units form a two-cavity mutual-fleeing test loop so as to cooperate with the flowmeter to perform a two-cavity mutual-fleeing test; when the pipeline selection module is in a third state, the switches form an equipment self-checking loop so as to cooperate with the first pressure sensor and the second pressure sensor to perform equipment self-checking and self-calibration.

Optionally, the gas input module comprises: compressed gas air supply pipe, first switch unit, filter and the pressure regulating solenoid valve that concatenates in proper order, pressure regulating solenoid valve is kept away from first switch unit one end be used for with the pipeline selection module is connected.

Optionally, the pipeline selecting module includes: a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a seventh switch unit, an eighth switch unit, a ninth switch unit, a tenth switch unit, and an eleventh switch unit; wherein,

the second switch unit and the eighth switch unit are connected in series to form the first gas supply branch and are connected with a hydrogen cavity of the electric pile through a hydrogen cavity gas supply pipe;

the third switch unit and the ninth switch unit are connected in series to form the second gas supply branch and are connected with a water cavity of the electric pile through a water cavity gas supply pipe;

the fourth switch unit and the tenth switch unit are connected in series to form the third gas supply branch and are connected with the cavity of the electric pile through a cavity gas supply pipe;

the eleventh switch unit is connected with the emptying measuring pipe after being connected with the flowmeter in series and is used as the emptying branch;

one end of the fifth switch unit is connected to a connection node of the second switch unit and the eighth switch unit, and the other end of the fifth switch unit is connected to the input end of the emptying branch circuit;

one end of the sixth switching unit is connected to a connection node of the third switching unit and the ninth switching unit, and the other end of the sixth switching unit is connected to the input end of the emptying branch;

one end of the seventh switch unit is connected to a connection node of the fourth switch unit and the tenth switch unit, and the other end of the seventh switch unit is connected to the input end of the emptying branch.

Optionally, the first state includes a hydrogen chamber test state, a water chamber test state and a cavity test state;

when the pipeline selection module is in a hydrogen cavity test state, connecting the evacuation measurement pipe with the hydrogen cavity air supply pipe, connecting the water cavity air supply pipe with a water cavity of the galvanic pile, and connecting the cavity air supply pipe with a cavity of the galvanic pile;

the second switch unit, the third switch unit, the fourth switch unit, the fifth switch unit, the seventh switch unit, the ninth switch unit, the tenth switch unit and the eleventh switch unit are turned on, and the eighth switch unit is turned off;

opening a first switch unit, adjusting the pressure regulating electromagnetic valve to enable the gas input module to provide the test gas with preset air pressure, reading the reading of the flowmeter to obtain the leakage flow of the hydrogen cavity under the preset air pressure, then closing the eleventh switch unit, and observing the reading change rate of the second pressure sensor within preset time to obtain the leakage flow of the hydrogen cavity;

when the pipeline selection module is in a water cavity test state, connecting the emptying measurement pipe with the water cavity air supply pipe, connecting the hydrogen cavity air supply pipe with a hydrogen cavity of the galvanic pile, and connecting the cavity air supply pipe with the cavity of the galvanic pile;

the second switch unit, the third switch unit, the fourth switch unit, the fifth switch unit, the seventh switch unit, the eighth switch unit, the tenth switch unit and the eleventh switch unit are turned on, and the ninth switch unit is turned off;

opening a first switch unit, adjusting the pressure regulating electromagnetic valve to enable the gas input module to provide the test gas with preset air pressure, reading the reading of the flowmeter to obtain the leakage flow of the water cavity under the preset air pressure, then closing the eleventh switch unit, and observing the reading change rate of the second pressure sensor within preset time to obtain the leakage flow of the water cavity;

when the pipeline selection module is in a cavity test state, connecting the evacuation measurement pipe with the cavity air supply pipe, connecting the water cavity air supply pipe with a water cavity of the galvanic pile, and connecting the hydrogen cavity air supply pipe with a hydrogen cavity of the galvanic pile;

the second switch unit, the third switch unit, the fourth switch unit, the fifth switch unit, the seventh switch unit, the eighth switch unit, the ninth switch unit and the eleventh switch unit are turned on, and the tenth switch unit is turned off;

open first switch unit, and adjust the pressure regulating solenoid valve so that gas input module provides and predetermines atmospheric pressure the test gas, read the reading of flowmeter, in order to obtain the cavity is in predetermine the leakage flow under the atmospheric pressure, then close eleventh switch unit observes in the time of predetermineeing the reading rate of change of second pressure sensor, in order to obtain the leakage flow of cavity.

Optionally, the second state includes a hydrogen-air blowby state, a hydrogen-water blowby state, and an air-water blowby state;

when the pipeline selection module is in the hydrogen-air blowby state, the pressure relief branch is communicated with the atmosphere, the hydrogen cavity air supply pipe is connected with the hydrogen cavity, the water cavity air supply pipe is connected with the water cavity, and the cavity air supply pipe is connected with the cavity;

turning on the second, seventh, eighth, tenth and eleventh switching units, and turning off the third, fourth, fifth, sixth and ninth switching units;

opening the first switch unit, adjusting the pressure regulating electromagnetic valve to enable the gas input module to provide the test gas with preset gas pressure, and reading the reading of the flowmeter to obtain the hydrogen-air blow-by flow rate under the preset gas pressure;

when the pipeline selection module is in the hydrogen water leakage state, the pressure relief branch is communicated with the atmosphere, the hydrogen cavity air supply pipe is connected with the hydrogen cavity, the water cavity air supply pipe is connected with the water cavity, and the cavity air supply pipe is connected with the cavity;

turning on the second, sixth, eighth, ninth, and eleventh switching units, and turning off the third, fourth, fifth, seventh, and tenth switching units;

opening the first switch unit, adjusting the pressure regulating electromagnetic valve to enable the gas input module to provide the test gas with preset air pressure, and reading the reading of the flowmeter to obtain the hydrogen water gas blowby flow rate under the preset air pressure;

when the pipeline selection module is in the empty water blowby state, the pressure relief branch is communicated with the atmosphere, the hydrogen cavity air supply pipe is connected with the hydrogen cavity, the water cavity air supply pipe is connected with the water cavity, and the cavity air supply pipe is connected with the cavity;

turning on the fourth, sixth, ninth, tenth and eleventh switching units, and turning off the second, third, fifth, seventh and eighth switching units;

and opening the first switch unit, adjusting the pressure regulating electromagnetic valve to enable the gas input module to provide the test gas with preset air pressure, and reading the reading of the flowmeter to obtain the air-water air-channeling flow under the preset air pressure.

Optionally, when the pipeline selection module is in the third state, the evacuation measurement pipe, the hydrogen cavity air supply pipe, the water cavity air supply pipe and the cavity air supply pipe are all connected to the atmosphere;

opening the second switch unit, the third switch unit, the fourth switch unit, the fifth switch unit, the sixth switch unit and the seventh switch unit, closing the eighth switch unit, the ninth switch unit, the tenth switch unit and the eleventh switch unit, then opening the first switch unit, and adjusting the pressure regulating solenoid valve to enable the gas input module to provide the test gas with preset pressure, when the reading of the first pressure sensor meets the pressure maintaining requirement, closing the pressure regulating solenoid valve, and recording the reading changes of the first pressure sensor and the flowmeter within preset time;

and correcting the measurement values of the first pressure sensor and the flowmeter through a gas state equation according to the recorded result, and judging the air tightness of the fuel cell air tightness detection equipment according to the reading reduction rate of the first pressure sensor.

Optionally, the switch unit is a switch solenoid valve or a hand valve.

Optionally, the method further includes: an equipment packaging module;

the equipment packaging module is used for packaging the gas input module, the first pressure sensor, the pipeline selection module, the second pressure sensor, the flow meter and the pressure relief module together.

A fuel cell airtightness detection method implemented on the basis of any one of the above fuel cell airtightness detection apparatuses, the fuel cell airtightness detection method comprising:

a gas input module is used for providing test gas for the pipeline selection module;

adjusting the state of the pipeline selection module, and when the pipeline selection module is in a first state, forming a single-cavity test loop by the plurality of switch units so as to cooperate with the second pressure sensor and the flowmeter to perform single-cavity leakage test; when the pipeline selection module is in a second state, the switch units form a two-cavity mutual-fleeing test loop so as to cooperate with the flowmeter to perform a two-cavity mutual-fleeing test; when the pipeline selection module is in a third state, the switches form an equipment self-checking loop so as to cooperate with the first pressure sensor and the second pressure sensor to perform equipment self-checking and self-calibration.

Optionally, when the gas input module comprises: the pipeline selection module comprises a compressed gas supply pipe, a first switch unit, a filter and a pressure regulating electromagnetic valve which are sequentially connected in series, wherein one end of the pressure regulating electromagnetic valve, which is far away from the first switch unit, is used for being connected with the pipeline selection module;

the pipeline selection module comprises: a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a seventh switch unit, an eighth switch unit, a ninth switch unit, a tenth switch unit, and an eleventh switch unit;

when the pipeline selection module is in a first state, the plurality of switch units form a single-cavity test loop so as to cooperate with the second pressure sensor and the flowmeter to perform a single-cavity leakage test process, which specifically comprises the following steps:

the first state comprises a hydrogen cavity test state, a water cavity test state and a cavity test state;

when the pipeline selection module is in the second state, the switch units form a two-cavity mutual-crossing test loop so as to cooperate with the flowmeter to perform a two-cavity mutual-crossing test process, which specifically comprises:

Optionally, when the pipeline selection module is in the third state, the plurality of switches form an equipment self-checking loop, so that the process of performing equipment self-checking and self-calibration by matching the first pressure sensor and the second pressure sensor specifically includes:

when the pipeline selection module is in the third state, the emptying measuring pipe, the hydrogen cavity air supply pipe, the water cavity air supply pipe and the cavity air supply pipe are all connected with the atmosphere;

According to the technical scheme, the fuel cell airtightness detection device comprises a gas input module, a first pressure sensor, a pipeline selection module, a second pressure sensor, a flow meter and a pressure relief module, wherein the pipeline selection module comprises a first state, a second state and a third state, and when the pipeline selection module is in the first state, the plurality of switch units form a single-cavity test loop to cooperate with the second pressure sensor and the flow meter to perform single-cavity external leakage test; when the pipeline selection module is in a second state, the switch units form a two-cavity mutual-fleeing test loop so as to cooperate with the flowmeter to perform a two-cavity mutual-fleeing test; when the pipeline selection module is in a third state, the switches form an equipment self-checking loop so as to cooperate with the first pressure sensor and the second pressure sensor to perform equipment self-checking and self-calibration. Namely, the fuel cell gas tightness detection equipment can be matched with the flow meter, the first pressure sensor and the second pressure sensor to realize single-cavity leakage test, two-cavity mutual channeling test, equipment self-detection and self-calibration through state adjustment of the pipeline selection module, so that the functions of automatic operation and self-detection and self-calibration are realized.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a fuel cell airtightness detection apparatus according to an embodiment of the present application;

fig. 2 is an external view schematically illustrating a fuel cell airtightness detection apparatus according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a fuel cell airtightness detection apparatus according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Embodiments of the present application provide a fuel cell gas tightness detection apparatus for measuring the gas tightness of a stack of a fuel cell, as shown in fig. 1,

the fuel cell airtightness detection apparatus includes: a gas input module 100, a first pressure sensor 15, a pipeline selection module 200, a second pressure sensor 28, a flow meter 23, and a pressure relief module 300; wherein,

the gas input module 100 is connected to the pipeline selection module 200, and is configured to provide a test gas to the pipeline selection module 200;

the first pressure sensor 15 is disposed at the connection between the gas input module 100 and the pipeline selection module 200;

the pipeline selection module 200 comprises a plurality of switch units, the switch units form an emptying branch, a first gas supply branch, a second gas supply branch and a third gas supply branch, the second pressure sensor 28 and the flowmeter 23 are arranged on the emptying branch, and the first gas supply branch, the second gas supply branch and the third gas supply branch are respectively connected with a hydrogen cavity, a water cavity and a cavity of the electric pile;

the pressure relief module 300 is configured to relieve the pressure of the pipeline selection module 200 when the pressure of the test gas exceeds a preset value;

the pipeline selection module 200 further comprises a first state, a second state and a third state, when the pipeline selection module 200 is in the first state, the plurality of switch units form a single-cavity test loop so as to cooperate with the second pressure sensor 28 and the flowmeter 23 to perform a single-cavity leakage test; when the pipeline selection module 200 is in the second state, the switch units form a two-cavity cross-flow test loop so as to cooperate with the flowmeter 23 to perform a two-cavity cross-flow test; when the circuit selection module 200 is in the third state, the switches form a device self-test loop to cooperate with the first pressure sensor 15 and the second pressure sensor 28 to perform device self-test and self-calibration.

The fuel cell airtightness detection device can be matched with the flowmeter 23, the first pressure sensor 15 and the second pressure sensor 28 to realize single-cavity leakage test, two-cavity mutual crossing test, device self-detection and self-calibration through state adjustment of the pipeline selection module 200, so that the functions of automatic operation and self-detection and self-calibration are realized, and in addition, the fuel cell airtightness detection device further comprises a pressure release module 300, so that the automatic pressure release function is realized, and the whole safe operation of the device is ensured.

In addition, the fuel cell air tightness detection equipment also has the characteristics of small size, light weight and strong adaptability to use environment.

Optionally, the pressure relief module 300 includes a pressure relief valve and a pressure relief port 33, and is configured to open the pressure relief valve when the pressure of the test gas exceeds a preset value, so as to relieve the pressure of the pipeline selection module 200.

In fig. 1, reference numeral 400 denotes a stack of the fuel cell, 34 denotes a hydrogen chamber of the stack of the fuel cell, 35 denotes a water chamber of the stack of the fuel cell, and 36 denotes a cavity of the stack of the fuel cell.

The specific structure of each module of the fuel cell airtightness detection apparatus provided in the embodiments of the present application is described below.

On the basis of the above embodiments, in one embodiment of the present application, the gas input module 100 includes: compressed gas air supply pipe 11, first switch unit 12, filter 13 and pressure regulating solenoid valve 14 that concatenate in proper order, pressure regulating solenoid valve 14 is kept away from first switch unit 12 one end be used for with pipeline selection module 200 is connected.

Wherein, the compressed gas supply pipe 11 provides an input channel of the test gas, the open and close states of the first switch unit 12 can determine the working state of the gas input module 100, and the filter 13 is used for filtering the test gas. The pressure regulating solenoid valve 14 is used to regulate its opening to regulate the pressure of the test gas entering the line selection module 200.

Optionally, still referring to fig. 1, the pipeline selection module 200 includes: a second switching unit 16, a third switching unit 17, a fourth switching unit 18, a fifth switching unit 20, a sixth switching unit 21, a seventh switching unit 22, an eighth switching unit 24, a ninth switching unit 25, a tenth switching unit 26, and an eleventh switching unit 27; wherein,

the second switch unit 16 and the eighth switch unit 24 are connected in series to form the first gas supply branch, and are connected with the hydrogen cavity of the electric pile through a hydrogen cavity gas supply pipe 30;

the third switch unit 17 and the ninth switch unit 25 are connected in series to form the second gas supply branch and are connected with the water cavity of the electric pile through a water cavity gas supply pipe 31;

the fourth switch unit 18 and the tenth switch unit 26 are connected in series to form the third gas supply branch, and are connected with the cavity of the electric pile through a cavity gas supply pipe 32;

the eleventh switch unit 27 is connected in series with the flow meter 23 and then connected with an emptying measurement pipe 29 to serve as the emptying branch;

one end of the fifth switch unit 20 is connected to the connection node between the second switch unit 16 and the eighth switch unit 24, and the other end is connected to the input end of the emptying branch;

one end of the sixth switching unit 21 is connected to a connection node between the third switching unit 17 and the ninth switching unit 25, and the other end is connected to an input end of the emptying branch;

one end of the seventh switching unit 22 is connected to the connection node between the fourth switching unit 18 and the tenth switching unit 26, and the other end is connected to the input end of the emptying branch.

when the pipeline selection module 200 is in a hydrogen cavity test state, the evacuation measurement pipe 29 is connected with the hydrogen cavity air supply pipe 30, the water cavity air supply pipe 31 is connected with a water cavity of the galvanic pile, and the cavity air supply pipe 32 is connected with a cavity of the galvanic pile;

the second switching unit 16, the third switching unit 17, the fourth switching unit 18, the fifth switching unit 20, the seventh switching unit 22, the ninth switching unit 25, the tenth switching unit 26, and the eleventh switching unit 27 are turned on, and the eighth switching unit 24 is turned off;

opening the first switch unit 12 and adjusting the pressure regulating solenoid valve 14 to make the gas input module 100 provide the test gas at a preset gas pressure, reading the reading of the flowmeter 23 to obtain the leakage flow rate of the hydrogen chamber at the preset gas pressure, then closing the eleventh switch unit 27, and observing the reading change rate of the second pressure sensor 28 within a preset time to obtain the leakage flow rate of the hydrogen chamber;

when the pipeline selection module 200 is in a water cavity test state, the evacuation measurement pipe 29 is connected with the water cavity air supply pipe 31, the hydrogen cavity air supply pipe 30 is connected with a hydrogen cavity of the galvanic pile, and the cavity air supply pipe 32 is connected with a cavity of the galvanic pile;

the second switching unit 16, the third switching unit 17, the fourth switching unit 18, the fifth switching unit 20, the seventh switching unit 22, the eighth switching unit 24, the tenth switching unit 26, and the eleventh switching unit 27 are turned on, and the ninth switching unit 25 is turned off;

opening the first switch unit 12, adjusting the pressure regulating solenoid valve 14 to make the gas input module 100 provide the test gas at a preset air pressure, reading the reading of the flowmeter 23 to obtain the leakage flow rate of the water cavity at the preset air pressure, then closing the eleventh switch unit 27, and observing the reading change rate of the second pressure sensor 28 within a preset time to obtain the leakage flow rate of the water cavity;

when the pipeline selection module 200 is in a cavity test state, the evacuation measurement pipe 29 is connected with the cavity air supply pipe 32, the water cavity air supply pipe 31 is connected with a water cavity of the galvanic pile, and the hydrogen cavity air supply pipe 30 is connected with a hydrogen cavity of the galvanic pile;

the second switching unit 16, the third switching unit 17, the fourth switching unit 18, the fifth switching unit 20, the seventh switching unit 22, the eighth switching unit 24, the ninth switching unit 25 and the eleventh switching unit 27 are turned on, and the tenth switching unit 26 is turned off;

the first switch unit 12 is turned on, the pressure regulating solenoid valve 14 is adjusted to enable the gas input module 100 to provide the test gas with the preset gas pressure, the reading of the flowmeter 23 is read to obtain the leakage flow rate of the cavity under the preset gas pressure, then the eleventh switch unit 27 is turned off, and the reading change rate of the second pressure sensor 28 is observed within the preset time to obtain the leakage flow rate of the cavity.

The second state comprises a hydrogen air blowby state, a hydrogen water blowby state and an air water blowby state;

when the pipeline selection module 200 is in the hydrogen-air blowby state, the pressure relief branch is communicated with the atmosphere, the hydrogen cavity gas supply pipe 30 is connected with the hydrogen cavity, the water cavity gas supply pipe 31 is connected with the water cavity, and the cavity gas supply pipe 32 is connected with the cavity;

the second switching unit 16, the seventh switching unit 22, the eighth switching unit 24, the tenth switching unit 26, and the eleventh switching unit 27 are turned on, and the third switching unit 17, the fourth switching unit 18, the fifth switching unit 20, the sixth switching unit 21, and the ninth switching unit 25 are turned off;

opening the first switch unit 12, and adjusting the pressure regulating solenoid valve 14 to enable the gas input module 100 to provide the test gas at a preset gas pressure, and reading the reading of the flow meter 23 to obtain the hydrogen-air blow-by gas flow rate at the preset gas pressure;

when the pipeline selection module 200 is in the hydrogen water leakage state, the pressure relief branch is communicated with the atmosphere, the hydrogen cavity gas supply pipe 30 is connected with the hydrogen cavity, the water cavity gas supply pipe 31 is connected with the water cavity, and the cavity gas supply pipe 32 is connected with the cavity;

the second, sixth, eighth, ninth and

eleventh switching units

16, 21, 24, 25 and 27 are turned on, and the third, fourth, fifth, seventh and

tenth switching units

17, 18, 20, 22 and 26 are turned off;

opening the first switch unit 12, and adjusting the pressure regulating solenoid valve 14 to make the gas input module 100 provide the test gas at a preset pressure, and reading the reading of the flow meter 23 to obtain the hydrogen water blowby gas flow rate at the preset pressure;

when the pipeline selection module 200 is in the empty water blowby state, the pressure relief branch is communicated with the atmosphere, the hydrogen cavity gas supply pipe 30 is connected with the hydrogen cavity, the water cavity gas supply pipe 31 is connected with the water cavity, and the cavity gas supply pipe 32 is connected with the cavity;

the fourth, sixth, ninth, tenth and

eleventh switching units

18, 21, 25, 26 and 27 are turned on, and the second, third, fifth, seventh and

eighth switching units

16, 17, 20, 22 and 24 are turned off;

the first switch unit 12 is opened, and the pressure regulating solenoid valve 14 is adjusted to enable the gas input module 100 to provide the test gas with the preset gas pressure, and the reading of the flowmeter 23 is read to obtain the air-water air-channeling flow rate under the preset gas pressure.

the second, sixth, eighth, ninth and

eleventh switching units

16, 21, 24, 25 and 27 are turned on, and the third, fourth, fifth, seventh and

tenth switching units

17, 18, 20, 22 and 26 are turned off;

the fourth, sixth, ninth, tenth and

eleventh switching units

18, 21, 25, 26 and 27 are turned on, and the second, third, fifth, seventh and

eighth switching units

16, 17, 20, 22 and 24 are turned off;

Optionally, the switch unit is a switch solenoid valve or a hand valve.

During the test, the dwell test can also be performed by closing the first switching unit 12. Optionally, when detecting that the air tightness of the pipeline module is insufficient, the system can further perform air tightness self-checking on each branch respectively, so that the leakage point position is determined, and the equipment can be maintained accurately.

Alternatively, instead of the eighth switching unit 24, the ninth switching unit 25, the tenth switching unit 26, and the eleventh switching unit 27, sealing plugs may be provided at the outlets of the evacuation measurement pipe 29, the hydrogen chamber air supply pipe 30, the water chamber air supply pipe 31, and the cavity air supply pipe 32 to synchronously detect the sealing property of the external output pipeline.

Preferably, during the self-test, the pressure in the pipe selection module may also be actively increased to test whether the pressure relief action of the pressure relief valve 19 and the pressure relief port 33 is effective.

On the basis of the above embodiment, in another embodiment of the present application, as shown in fig. 2 and 3, the fuel cell airtightness detecting apparatus further includes: an equipment packaging module;

the equipment packaging module (also referred to as equipment packaging or box) is used to package the gas input module 100, the first pressure sensor 15, the line selection module 200, the second pressure sensor 28, the flow meter 23, and the pressure relief module 300 together.

The equipment packaging module comprises a display panel, a control module, a power supply and power supply module, and further comprises a pipeline inlet and a pipeline outlet, wherein the pipeline inlet is used for enabling the compressed gas supply pipe 11 of the gas input module 100 to be connected with an external pipeline, and then the test gas is provided for the gas input module 100 through gas supply equipment. The pipeline outlet is used for providing a test gas outlet of the pressure relief branch, the first gas supply branch, the second gas supply branch and the third gas supply branch, and is also connected with an external pipeline, so that connection with each cavity or atmosphere of the galvanic pile is realized.

Optionally, the external pipeline may be configured with pipe joints of different types and rules as required.

Alternatively, the device packaging module may be in the form of a suitcase, trolley case, dolly, or the like, as desired. And can be configured into a sealed explosion-proof mode according to requirements.

The power supply and power supply module can be optimized into a lithium battery or other energy storage equipment according to the requirement.

In some embodiments of the present application, the pipeline selection module 200 may also be scalable to meet testing requirements of multiple stacks.

Correspondingly, an embodiment of the present application further provides a fuel cell airtightness detection method, which is implemented based on the fuel cell airtightness detection system of any one of the embodiments, and the fuel cell airtightness detection method includes:

In summary, the embodiment of the present application provides a fuel cell air tightness detection device and a detection method, where the fuel cell air tightness detection device includes a gas input module, a first pressure sensor, a pipeline selection module, a second pressure sensor, a flow meter, and a pressure relief module, where the pipeline selection module includes a first state, a second state, and a third state, and when the pipeline selection module is in the first state, the multiple switch units form a single-cavity test loop to cooperate with the second pressure sensor and the flow meter to perform a single-cavity external leakage test; when the pipeline selection module is in a second state, the switch units form a two-cavity mutual-fleeing test loop so as to cooperate with the flowmeter to perform a two-cavity mutual-fleeing test; when the pipeline selection module is in a third state, the switches form an equipment self-checking loop so as to cooperate with the first pressure sensor and the second pressure sensor to perform equipment self-checking and self-calibration. Namely, the fuel cell gas tightness detection equipment can be matched with the flow meter, the first pressure sensor and the second pressure sensor to realize single-cavity leakage test, two-cavity mutual channeling test, equipment self-detection and self-calibration through state adjustment of the pipeline selection module, so that the functions of automatic operation and self-detection and self-calibration are realized.

Features described in the embodiments in the present specification may be replaced with or combined with each other, each embodiment is described with a focus on differences from other embodiments, and the same and similar portions among the embodiments may be referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fuel cell gas tightness detecting apparatus for measuring a gas tightness of a stack of a fuel cell, comprising: the system comprises a gas input module, a first pressure sensor, a pipeline selection module, a second pressure sensor, a flowmeter and a pressure relief module; wherein,

2. The fuel cell airtightness detection apparatus according to claim 1, wherein the gas input module includes: compressed gas air supply pipe, first switch unit, filter and the pressure regulating solenoid valve that concatenates in proper order, pressure regulating solenoid valve is kept away from first switch unit one end be used for with the pipeline selection module is connected.

3. The fuel cell airtightness detection apparatus according to claim 2, wherein the pipe selection module includes: a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, a sixth switch unit, a seventh switch unit, an eighth switch unit, a ninth switch unit, a tenth switch unit, and an eleventh switch unit; wherein,

4. The fuel cell airtightness detection apparatus according to claim 3, wherein the first state includes a hydrogen chamber test state, a water chamber test state, and a cavity test state;

5. The fuel cell gas tightness detection apparatus according to claim 3, wherein the second state includes a hydrogen air blowby state, a hydrogen water blowby state, and an air water blowby state;

6. The fuel cell gas tightness detecting apparatus according to claim 3, wherein the evacuation measuring pipe, the hydrogen chamber gas supply pipe, the water chamber gas supply pipe, and the cavity gas supply pipe are all connected to the atmosphere when the pipe selecting module is in the third state;

7. The fuel cell airtightness detection apparatus according to claim 1, wherein the switching unit is an on-off solenoid valve or a hand valve.

8. The fuel cell airtightness detection apparatus according to claim 1, further comprising: an equipment packaging module;

9. A fuel cell airtightness detection method implemented based on the fuel cell airtightness detection apparatus according to any one of claims 1 to 8, the fuel cell airtightness detection method comprising:

10. The method of claim 9, wherein when the gas input module comprises: the pipeline selection module comprises a compressed gas supply pipe, a first switch unit, a filter and a pressure regulating electromagnetic valve which are sequentially connected in series, wherein one end of the pressure regulating electromagnetic valve, which is far away from the first switch unit, is used for being connected with the pipeline selection module;

11. The method of claim 10, wherein the second state comprises a hydrogen air blowby state, a hydrogen water blowby state, and an air water blowby state;

12. The method according to claim 10, wherein when the circuit selection module is in the third state, the plurality of switches form a device self-test loop to cooperate with the first pressure sensor and the second pressure sensor to perform a device self-test and self-calibration process specifically comprises: