CN110987324A - Fuel cell air tightness testing device and testing method - Google Patents
Fuel cell air tightness testing device and testing method Download PDFInfo
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- CN110987324A CN110987324A CN201911377943.5A CN201911377943A CN110987324A CN 110987324 A CN110987324 A CN 110987324A CN 201911377943 A CN201911377943 A CN 201911377943A CN 110987324 A CN110987324 A CN 110987324A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
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Abstract
The invention provides a fuel cell air tightness test device and a test method, wherein the fuel cell air tightness test device comprises: the device comprises a battery to be tested, a main pipeline and a first inlet branch pipe, wherein the main pipeline is communicated with the first inlet branch pipe, the other end of the first inlet branch pipe is communicated with an inlet of a first flow path, and a first flow meter, a first pressure meter and a first control valve are arranged on the first inlet branch pipe; the three-way valve is characterized by further comprising a second inlet branch pipe and a second outlet branch pipe, wherein one end of the second inlet branch pipe is communicated with the main pipeline, the other end of the second inlet branch pipe is communicated with the second flow path inlet, a second control valve is arranged on the second inlet branch pipe, and a third control valve, a third flow meter and a third pressure meter are further arranged on the second outlet branch pipe. The invention can detect whether the battery leaks outwards or not and also can detect whether the battery leaks inwards, thereby greatly improving the air tightness precision; and moreover, pressure detection and flow detection can be realized, comprehensive judgment is performed by various detection means, and the precision of air tightness detection is further improved.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a fuel cell airtightness testing device and a testing method.
Background
The air tightness of the fuel cell is a strict control item in the production process of the fuel cell, and the air tightness is directly related to the performance of the fuel cell and the safety of the fuel cell.
The production process includes the first air tightness test of the bipolar plate and the subsequent air tightness test of the monocell and the galvanic pile. The air tightness of the single cell and the electric pile also has the problem of gas leakage of the membrane electrode. Therefore, a simple operation device is needed for quality inspection of the production process and judgment of external leakage and internal leakage of the fuel cell. The existing detection equipment tests the airtightness of a single cavity through a flow method or a pressure difference method, and the existing detection equipment cannot reflect the internal leakage or the external leakage of a cell stack. For example, the fuel cell stack airtightness detection device 201721921211.4 is a device for detecting the flow rate of gas through a flow meter, and accurately obtaining the flow rate of gas before and after the gas is introduced into the cell to be detected to determine the airtightness of the fuel cell.
The invention provides a fuel cell air tightness testing device and a testing method, which are researched and designed because the fuel cell in the prior art cannot detect whether a reactor is internally leaked or externally leaked and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that the fuel cell in the prior art cannot detect whether the reactor is internally leaked or externally leaked, so as to provide a fuel cell air tightness test device and a test method.
The invention provides a fuel cell airtightness testing apparatus, which includes:
the testing equipment comprises a battery to be tested, a first pressure meter, a first control valve, a second pressure meter and a second control valve, wherein the battery to be tested is provided with a first cavity and a second cavity, the first cavity is provided with a first flow path inlet and a first flow path outlet, the second cavity is provided with a second flow path inlet and a second flow path outlet, the testing equipment further comprises a main pipeline and a first inlet branch pipe, the main pipeline is communicated with the first inlet branch pipe, the other end of the first inlet branch pipe is communicated with the first flow path inlet, and the first inlet branch pipe is provided with the first flow meter, the first pressure meter and the first control valve;
the test equipment further comprises a second inlet branch pipe and a second outlet branch pipe, one end of the second inlet branch pipe is communicated with the main pipeline, the other end of the second inlet branch pipe is communicated with the second flow path inlet, a third control valve is arranged on the second inlet branch pipe, one end of the second outlet branch pipe is communicated with the second flow path outlet, and a second control valve, a second flowmeter and a second pressure gauge are further arranged on the second outlet branch pipe.
Preferably, the first and second electrodes are formed of a metal,
the main pipeline is also provided with a pressure reducing valve, and when the pressure on the main pipeline reaches a preset pressure range, the pressure reducing valve controls the main pipeline to be disconnected; and/or the test equipment further comprises a first outlet branch pipe, wherein one end of the first outlet branch pipe is communicated to the first flow path outlet, and the other end of the first outlet branch pipe is communicated to the first plug.
Preferably, the first and second electrodes are formed of a metal,
the first channel inlet is a hydrogen channel inlet and can be used for receiving supplied hydrogen gas, the first channel outlet is a hydrogen channel outlet and can be used for discharging hydrogen gas, the second channel inlet is an air channel inlet and can be used for receiving supplied air, and the second channel outlet is an air channel outlet and can be used for discharging air.
Preferably, the first and second electrodes are formed of a metal,
the battery to be tested is also provided with a third cavity, the third cavity is provided with a third flow path inlet and a third flow path outlet, the testing equipment further comprises a third inlet branch pipe and a third outlet branch pipe, one end of the third inlet branch pipe is communicated with the third flow path inlet, the other end of the third inlet branch pipe is a free end, one end of the third outlet branch pipe is communicated with the third flow path outlet, and the other end of the third outlet branch pipe is connected to the second plug.
Preferably, the first and second electrodes are formed of a metal,
the third flow path inlet is a third flow path inlet, and the third flow path outlet is a third flow path outlet; and/or a fourth control valve and a third pressure gauge are arranged on the third outlet branch pipe.
The invention also provides a control method of the fuel cell air tightness test equipment, which is used for controlling the air tightness detection of the external leakage or the internal leakage of the internal air tightness of the battery to be tested.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be detected is required to be detected to have external leakage, the first control valve and the second control valve are opened, the third control valve is controlled to be closed, and whether the battery to be detected has external leakage is judged according to pressure change on the first pressure gauge;
or when the battery to be detected has external leakage, opening the first control valve and the second control valve, controlling the third control valve to be opened, and judging whether the battery to be detected has external leakage or not through the flow change on the first flowmeter.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be tested is judged to have external leakage through the pressure change on the first pressure gauge, the battery to be tested is also subjected to auxiliary judgment of whether the battery to be tested has external leakage through detecting the pressure change on the second pressure gauge;
or when the battery to be tested is judged to have leakage through the flow change on the first flowmeter, the battery to be tested is also judged to have leakage in an auxiliary manner through detecting the flow change on the second flowmeter.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be detected has internal leakage, opening a first control valve, closing a second control valve, controlling a third control valve to be closed, and judging whether the battery to be detected has external leakage or not according to pressure change on a first pressure gauge;
or when the battery to be detected has internal leakage, opening the first control valve, closing the second control valve, controlling the third control valve to be opened, and judging whether the battery to be detected has external leakage or not through the flow change on the first flowmeter.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be tested is judged to have internal leakage through the pressure change on the first pressure gauge, the battery to be tested is also subjected to auxiliary judgment of whether the battery to be tested has internal leakage through the detection of the pressure change on the second pressure gauge;
or when the battery to be tested is judged to have internal leakage through the flow change on the first flowmeter, the battery to be tested is also judged to have internal leakage in an auxiliary manner through detecting the flow change on the second flowmeter.
The fuel cell air tightness testing device and the testing method provided by the invention have the following beneficial effects:
according to the invention, the first inlet branch pipe and the main pipeline are arranged by communicating the first flow path inlet of the first cavity of the battery to be detected, the detection gas can be introduced through the main pipeline, the first inlet branch pipe is introduced into the first cavity, the second flow path inlet of the second cavity of the battery to be detected is communicated to the main pipeline through the second inlet branch pipe, and the detection gas can be introduced into the second cavity, so that the detection gas is suitable for simultaneously opening the first inlet branch pipe and the second inlet branch pipe when the leakage of the battery to be detected is detected, the second control valve on the second outlet branch pipe is closed at the moment, and the gas cannot be mixed between the cavities by observing the pressure change of the first pressure gauge on the first inlet branch pipe, so that if the leakage exists, the leakage can only leak to the outside of the battery (external leakage), and at the moment, whether the external leakage exists can be accurately detected; or at the moment, the first control valve is opened, the third control valve is opened, and the second control valve is opened, so that the two cavities are communicated, but the fluid can be led out through the second outlet branch pipe, and at the moment, the flow change on the flowmeter can be judged to judge whether leakage exists or not by detecting the flow;
in addition, if the battery needs to be detected whether internal leakage exists, the third control valve 9 is closed to ensure that the two cavities are not communicated, the first control valve and the second control valve are simultaneously opened at the moment, namely, the first inlet branch pipe and the second inlet branch pipe are simultaneously opened, and by observing the pressure change of the first pressure gauge on the first inlet branch pipe, because the two cavities are not communicated at the moment, gas can be mixed between the cavities, so if the leakage exists, the leakage between the internal battery cavities (the internal leakage leaks from the ventilated first cavity to the non-ventilated second cavity) can be accurately detected; or at the moment, the first control valve is opened, the third control valve is closed, and the second control valve is opened, so that the two cavities are not communicated, but the fluid can be led out through the second outlet branch pipe, and the flow change on the flow meter can be judged at the moment, so that whether the internal leakage exists or not can be accurately judged through detecting the flow; the invention can detect whether the battery to be detected leaks outwards or not and also can detect whether the battery to be detected leaks inwards, thereby greatly improving the air tightness precision; and moreover, pressure detection and flow detection can be realized, comprehensive judgment is performed by various detection means, and the precision of air tightness detection is further improved.
Drawings
Fig. 1 is a schematic structural view of a fuel cell airtightness testing apparatus of the present invention.
The reference numbers in the figures denote:
100. a battery to be tested; A. a main pipeline; a1, a first inlet branch pipe; a2, a first outlet branch pipe; b1, a second inlet branch pipe; b2, a second outlet branch pipe; c1, third inlet manifold; c2, a third outlet leg; 1A, a first channel inlet; 1B, a first channel outlet; 2A, a second flow path inlet; 2B, a second flow path outlet; 3A, a third flow path inlet; 3B, a third flow path outlet; 1. a pressure reducing valve; 2. a first flow meter; 3. a first control valve; 4. a first pressure gauge; 5. a first plug; 6. a second flow meter; 7. a second control valve; 8. a second pressure gauge; 9. a third control valve; 10. a second plug; 11. a fourth control valve; 12. and a third pressure gauge.
Detailed Description
As shown in fig. 1, the present invention provides a fuel cell airtightness testing apparatus comprising:
the testing equipment comprises a battery 100 to be tested, a first cavity and a second cavity, wherein the first cavity is provided with a first flow path inlet 1A and a first flow path outlet 1B, the second cavity is provided with a second flow path inlet 2A and a second flow path outlet 2B, the testing equipment further comprises a main flow path A and a first inlet branch pipe A1, the main flow path A is communicated with the first inlet branch pipe A1, the other end of the first inlet branch pipe A1 is communicated with the first flow path inlet 1A, a first flow meter 2, a first pressure meter 4 and a first control valve 3 are arranged on the first inlet branch pipe A1, and the first outlet branch pipe A2 is communicated with a first plug 5;
the test equipment further comprises a second inlet branch pipe B1 and a second outlet branch pipe B2, one end of the second inlet branch pipe B1 is communicated with the main pipeline A, the other end of the second inlet branch pipe B1 is communicated with the second flow path inlet 2A, a third control valve 9 is arranged on the second inlet branch pipe B1, one end of the second outlet branch pipe B2 is communicated with the second flow path outlet 2B, and a second control valve 7, a second flow meter 6 and a second pressure meter 8 are further arranged on the second outlet branch pipe B2.
According to the invention, the first inlet branch pipe and the main pipeline are arranged by communicating the first flow path inlet of the first cavity of the battery to be detected, the detection gas can be introduced through the main pipeline, the first inlet branch pipe is introduced into the first cavity, the second flow path inlet of the second cavity of the battery to be detected is communicated to the main pipeline through the second inlet branch pipe, and the detection gas can be introduced into the second cavity, so that the detection gas is suitable for simultaneously opening the first inlet branch pipe and the second inlet branch pipe when the leakage of the battery to be detected is detected, the second control valve on the second outlet branch pipe is closed at the moment, and the gas cannot be mixed between the cavities by observing the pressure change of the first pressure gauge on the first inlet branch pipe, so that if the leakage exists, the leakage can only leak to the outside of the battery (external leakage), and at the moment, whether the external leakage exists can be accurately detected; or at the moment, the first control valve is opened, the third control valve is opened, and the second control valve is opened, so that the two cavities are communicated, but the fluid can be led out through the second outlet branch pipe, and at the moment, the flow change on the flowmeter can be judged to judge whether leakage exists or not by detecting the flow;
in addition, if the battery needs to be detected whether internal leakage exists, the third control valve 9 is closed to ensure that the two cavities are not communicated, the first control valve and the second control valve are simultaneously opened at the moment, namely, the first inlet branch pipe and the second inlet branch pipe are simultaneously opened, and by observing the pressure change of the first pressure gauge on the first inlet branch pipe, because the two cavities are not communicated at the moment, gas can be mixed between the cavities, so if the leakage exists, the leakage between the internal battery cavities (the internal leakage leaks from the ventilated first cavity to the non-ventilated second cavity) can be accurately detected; or at the moment, the first control valve is opened, the third control valve is closed, and the second control valve is opened, so that the two cavities are not communicated, but the fluid can be led out through the second outlet branch pipe, and the flow change on the flow meter can be judged at the moment, so that whether the internal leakage exists or not can be accurately judged through detecting the flow; the invention can detect whether the battery to be detected leaks outwards or not and also can detect whether the battery to be detected leaks inwards, thereby greatly improving the air tightness precision; and moreover, pressure detection and flow detection can be realized, comprehensive judgment is performed by various detection means, and the precision of air tightness detection is further improved.
Preferably, the first and second electrodes are formed of a metal,
the main pipeline A is also provided with a pressure reducing valve 1, and when the pressure on the main pipeline A reaches a preset pressure range, the pressure reducing valve 1 controls the main pipeline A to be disconnected. Gas for detection can be introduced into each cavity of the fuel cell through the main pipeline, and the pressure reducing valve arranged on the main pipeline can play a role in keeping constant pressure.
Preferably, the first and second electrodes are formed of a metal,
the first channel inlet 1A is a hydrogen channel inlet and can be used for receiving supplied hydrogen gas, the first channel outlet 1B is a hydrogen channel outlet and can be used for discharging hydrogen gas, the second channel inlet 2A is an empty channel inlet and can be used for receiving supplied air, and the second channel outlet 2B is an empty channel outlet and can be used for discharging air. This is a preferred configuration of the first flow path inlet of the present invention, that is, the hydrogen gas is introduced, so that the first chamber can be a hydrogen gas chamber and the second chamber can be an air chamber.
Preferably, the first and second electrodes are formed of a metal,
the battery 100 to be tested is further provided with a third cavity, the third cavity is provided with a third flow path inlet 3A and a third flow path outlet 3B, the testing equipment further comprises a third inlet branch pipe C1 and a third outlet branch pipe C2, one end of the third inlet branch pipe C1 is communicated with the third flow path inlet 3A, the other end of the third inlet branch pipe C3526 is a free end, one end of the third outlet branch pipe C2 is communicated with the third flow path outlet 3B, and the other end of the third outlet branch pipe C2 is connected to the second plug 10. The third chamber and the third inlet branch pipe and the third outlet branch pipe can judge whether the inner part of the chamber is internally leaked or not the same as the second outlet branch pipe, and can effectively detect whether the pressure is reduced or not through the third pressure gauge, and judge whether the inner part is leaked or not.
Preferably, the first and second electrodes are formed of a metal,
the third flow path inlet is a waterway inlet, and the third flow path outlet is a waterway outlet; and/or a fourth control valve 11 and a third pressure gauge 12 are arranged on the third outlet branch pipe. This is a preferred configuration of the third flow path inlet of the present invention, i.e. to access the waterway, so that the third chamber can be a waterway chamber.
The invention also provides a control method of the fuel cell air tightness test equipment, which is used for controlling the air tightness detection of the external leakage or the internal leakage of the internal air tightness of the battery to be tested.
The object of the present invention is to make a quality judgment of the airtightness of a fuel cell by a simple and low-cost apparatus, and to make it possible to judge the conditions of internal leakage or external leakage of the fuel cell.
To achieve this, the following techniques are performed:
three independent pipelines are designed, namely a main testing pipeline and an adjacent pipeline.
The test pipeline A needs to be connected with an air source, and the pressure of the air source can be adjusted through a pressure adjusting valve (a pressure reducing valve 1), and the pressure is generally 0.01MPa-0.3 MPa. The gas mass flowmeter (the first flowmeter 2), the flow range of 0.1L/min-1L/min and the high-precision pressure gauge (the first pressure gauge 4) are connected in series.
The B2 pipeline needs to be provided with a high-precision pressure gauge (a second pressure gauge 8) and a mass flow meter (a second flow meter 6) of 0-0.5 l/min.
The C1 line needs to be equipped with a high precision pressure gauge (third pressure gauge 12).
The A1 pipeline is connected into a first hydrogen cavity of the battery, the B1 pipeline is connected into a third air cavity of the battery, and the C1 pipeline is connected into a second cooling cavity (water through cavity) of the battery.
When the gas is introduced into the pipeline A1 and the pipeline B1 to reach the test pressure, all the gas inlet and outlet valves are closed (the third control valve 9 is opened), the three cavities of the fuel cell are in a pressure balance state, and the cavities cannot be connected with each other. And the gas pressure drop is observed, and the leakage judgment can be carried out. (when the pressure of the first pressure gauge 4 is reduced greatly, the leakage exists, otherwise, the leakage does not exist; the second pressure gauge 8 is used for auxiliary judgment)
Since it is determined that there is no leakage from the battery, when the gas is introduced into the a1 pipeline and reaches the test pressure, the B1 pipeline leakage valve of the flow meter is opened (the third control valve 9 is closed), so that the hydrogen cavity of the battery generates a pressure difference, and if the oil leaks, the gas will flow. Whether the gas leakage amount is normal or internal leakage can be judged through the flow. If close relief valve (second control valve 7), the change through 4 pressure reductions of first manometer and 8 pressure risees of second manometer judges interior hourglass condition (or open second control valve 7, detects the flow through first flowmeter 2 and second flowmeter 6 and judges whether interior hourglass), and relief pressure valve 1 is normally opened when interior hourglass detects, and first control valve 3 is normally opened.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be detected has external leakage, the first control valve 3 and the third control valve 9 are opened, the second control valve 7 is controlled to be closed, and whether the battery to be detected has external leakage is judged through the pressure change on the first pressure gauge 4;
or when the battery to be detected has leakage, the first control valve 3 and the third control valve 9 are opened to control the second control valve 7 to be opened, and whether the battery to be detected has leakage is judged through the flow change on the first flowmeter 2.
This is the main and preferred control form of the present invention when judging external leakage, because the third control valve 9 is opened at this time to make the two cavities communicate, by observing the pressure change of the first pressure gauge on the first inlet branch pipe, because the two cavities communicate at this time, the cavities will not blow by gas each other, therefore if leakage occurs, it is only to leak to the outside of the battery (external leakage), at this time, it can be detected accurately whether external leakage exists; or at the moment, the first control valve, the third control valve and the second control valve 7 are opened, so that the two cavities are communicated, but the fluid can be led out through the second outlet branch pipe, and at the moment, the flow change on the flowmeter can be judged to judge whether leakage exists or not by detecting the flow.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be tested is judged to have external leakage through the pressure change on the first pressure gauge 4, the battery to be tested is also judged to have external leakage in an auxiliary way through detecting the pressure change on the second pressure gauge 8;
or when the battery to be tested is judged to have leakage through the flow change on the first flowmeter 2, the battery to be tested is also judged to have leakage in an auxiliary manner by detecting the flow change on the second flowmeter 6.
The invention is a further preferable detection control means for judging whether the battery leaks, namely, whether the battery leaks is judged by the change of the pressure value of the pressure gauge on the branch B2 (closing the second control valve at the moment), and if the result detected by the second pressure gauge is consistent with the detection result of the first pressure gauge, the detection judgment result is more accurate; and judging whether leakage exists or not through the size change of the flow meter on the branch B2 (at the moment, the second control valve is opened), and if the detection result of the second flow meter is consistent with the detection result of the first flow meter, the detection judgment result is more accurate.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be detected has internal leakage, the first control valve 3 is opened, the third control valve 9 is closed, the second control valve 7 is controlled to be closed, and whether the battery to be detected has external leakage is judged according to the pressure change on the first pressure gauge 4;
or when the battery to be detected has internal leakage, the first control valve 3 is opened, the third control valve 9 is closed, the second control valve 7 is controlled to be opened, and whether the battery to be detected has external leakage is judged through the flow change on the first flowmeter 2.
This is the main and preferred control form of the present invention when judging internal leakage, because the third control valve 9 is closed at this time so that the two cavities are not communicated, by observing the pressure change of the first pressure gauge on the first inlet branch pipe, because the two cavities are not communicated at this time, the gas between the cavities will not be mixed, therefore if leakage occurs, it is the leakage between the internal battery cavities (internal leakage, leakage from the first cavity that is ventilated to the second cavity that is not ventilated), it can accurately detect whether there is internal leakage; or at the moment, the first control valve is opened, the third control valve is closed, and the second control valve 7 is opened, so that the two cavities are not communicated, but the fluid can be led out through the second outlet branch pipe, and at the moment, the flow change on the flow meter can be judged to accurately judge whether internal leakage exists or not by detecting the flow.
Preferably, the first and second electrodes are formed of a metal,
when the battery to be tested is judged to have internal leakage through the pressure change on the first pressure gauge 4, the battery to be tested is also judged to have internal leakage in an auxiliary manner through detecting the pressure change on the second pressure gauge 8;
or when the battery to be tested is judged to have internal leakage through the flow change on the first flowmeter 2, the battery to be tested is also judged to have internal leakage in an auxiliary manner through detecting the flow change on the second flowmeter 6.
The invention is a further preferable detection control means for judging whether the battery has internal leakage, namely, whether the battery has leakage is judged by the change of the pressure value of the pressure gauge on the branch B2 (closing the second control valve at the moment), and if the result detected by the second pressure gauge is consistent with the detection result of the first pressure gauge, the detection judgment result is more accurate; and judging whether leakage exists or not through the size change of the flow meter on the branch B2 (at the moment, the second control valve is opened), and if the detection result of the second flow meter is consistent with the detection result of the first flow meter, the detection judgment result is more accurate.
The invention can accurately and rapidly test the air tightness of the battery through the opening and closing of the valve by the flowmeter and the high-precision pressure gauge. The main test can be quickly aerated through a large flow meter. The adjacent channel can precisely detect the gas leakage amount through a small flowmeter.
1. Through the hydrogen cavity to the battery, equal pressure's gas is poured into simultaneously in the water cavity, leaks outward through the volume of revealing judgement. And judging internal leakage through the pressure difference of each cavity of the battery.
2. The opening or closing of the second control valve 7 allows the judgment by the differential pressure method when the B2 line is closed, and the judgment by the flow method when the test line B2 is open to the outside atmosphere when the second control valve 7 is opened.
The gas leakage amount of the single cell can be detected. The total flow rate was divided by the number of cells to obtain data.
The description is made with reference to the accompanying drawings and examples:
step one, an inlet of a hydrogen cavity of the fuel cell is connected to an A gas circuit pressure gauge (a first pressure gauge 4), and an outlet of the hydrogen cavity of the fuel cell is connected to a first plug 5.
And step two, connecting an inlet of an air cavity of the fuel cell to a stop valve (a third control valve 9) of a B1 air channel, and connecting an outlet of the air cavity to a second pressure gauge 8.
And step three, connecting an inlet of a cooling cavity (a water channel cavity) of the fuel cell to a second plug 10 of the air channel, and connecting an outlet of the cooling cavity to an air port of a C1 air channel third pressure gauge 12.
Opening the first control valve 3 and the third control valve 9, closing the second control valve 7 and the fourth control valve 11, and after the pressures of the air paths A1, B1 and B2 are equal and stable, closing the first control valve 3, opening the third control valve 9 and closing the second control valve 7; and (3) observing the pressure drop of the high-precision first pressure gauge 4 and the high-precision second pressure gauge 8, wherein if the sealing is not good, the pressure drops, and because the pressures of all cavities are basically equal, the cavities cannot be communicated with each other, and if the pressure of a certain cavity drops, the leakage is probably caused to the maximum extent, so that the leakage condition is judged. Or opening the second control valve 7, observing the passing flow of the first flowmeter 2 after the pressure is stabilized, and judging the leakage by a flow method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A fuel cell airtightness testing apparatus is characterized in that: the method comprises the following steps:
the testing equipment comprises a battery (100) to be tested, a first cavity and a second cavity, wherein the first cavity is provided with a first flow path inlet (1A) and a first flow path outlet (1B), the second cavity is provided with a second flow path inlet (2A) and a second flow path outlet (2B), the testing equipment further comprises a main pipeline (A) and a first inlet branch pipe (A1), the main pipeline (A) is communicated with the first inlet branch pipe (A1), the other end of the first inlet branch pipe (A1) is communicated with the first flow path inlet (1A), and a first flow meter (2), a first pressure meter (4) and a first control valve (3) are arranged on the first inlet branch pipe (A1);
the test equipment further comprises a second inlet branch pipe (B1) and a second outlet branch pipe (B2), one end of the second inlet branch pipe (B1) is communicated with the main pipeline (A), the other end of the second inlet branch pipe is communicated with the second flow path inlet (2A), a third control valve (9) is arranged on the second inlet branch pipe (B1), one end of the second outlet branch pipe (B2) is communicated with the second flow path outlet (2B), and a second control valve (7), a second flowmeter (6) and a second pressure gauge (8) are further arranged on the second outlet branch pipe (B2).
2. The fuel cell airtightness testing apparatus according to claim 1, characterized in that:
the main pipeline (A) is also provided with a pressure reducing valve (1), and when the pressure on the main pipeline (A) reaches a preset pressure range, the pressure reducing valve (1) controls the main pipeline (A) to be disconnected; and/or the test equipment further comprises a first outlet branch pipe (A2), wherein one end of the first outlet branch pipe (A2) is communicated to the first flow path outlet (1B), and the other end of the first outlet branch pipe is communicated to the first plug (5).
3. The fuel cell airtightness testing apparatus according to claim 1 or 2, characterized in that:
the first channel inlet (1A) is a hydrogen channel inlet and can be used for receiving supplied hydrogen gas, the first channel outlet (1B) is a hydrogen channel outlet and can be used for discharging hydrogen gas, the second channel inlet (2A) is an empty channel inlet and can be used for receiving supplied air, and the second channel outlet (2B) is an empty channel outlet and can be used for discharging air.
4. The fuel cell airtightness testing apparatus according to any one of claims 1 to 3, characterized in that:
the battery (100) to be tested is provided with a third cavity, the third cavity is provided with a third flow path inlet (3A) and a third flow path outlet (3B), the testing equipment further comprises a third inlet branch pipe (C1) and a third outlet branch pipe (C2), one end of the third inlet branch pipe (C1) is communicated with the third flow path inlet (3A), the other end of the third inlet branch pipe is a free end, one end of the third outlet branch pipe (C2) is communicated with the third flow path outlet (3B), and the other end of the third outlet branch pipe is connected to the second plug (10).
5. The fuel cell airtightness testing apparatus according to claim 4, characterized in that:
the third flow channel inlet (3A) is a waterway inlet, and the third flow channel outlet (3B) is a waterway outlet; and/or a fourth control valve (11) and a third pressure gauge (12) are arranged on the third outlet branch pipe (C2).
6. A test method of the fuel cell airtightness test apparatus according to any one of claims 1 to 5, characterized in that: and testing the air tightness of the battery to be tested for external leakage or internal leakage.
7. The test method of claim 6, wherein:
when the battery to be detected is required to be detected to have leakage, the first control valve (3) and the third control valve (9) are opened, the second control valve (7) is controlled to be closed, and whether the battery to be detected has leakage is judged through pressure change on the first pressure gauge (4);
or when the battery to be detected needs to be detected whether to leak, the first control valve (3) and the third control valve (9) are opened, the second control valve (7) is controlled to be opened, and whether to leak the battery to be detected is judged through the flow change on the first flow meter (2).
8. The test method of claim 7, wherein:
when the battery to be tested is judged to have leakage through the pressure change on the first pressure gauge (4), the battery to be tested is also judged to have leakage in an auxiliary manner through detecting the pressure change on the second pressure gauge (8);
or when the battery to be tested is judged to have leakage through the flow change on the first flowmeter (2), the battery to be tested is also judged to have leakage in an auxiliary manner through detecting the flow change on the second flowmeter (6).
9. The test method of claim 6, wherein:
when the battery to be detected has internal leakage, opening the first control valve (3), closing the third control valve (9), controlling the second control valve (7) to close, and judging whether the battery to be detected has external leakage through the pressure change on the first pressure gauge (4);
or when the battery to be detected has internal leakage, the first control valve (3) is opened, the third control valve (9) is closed, the second control valve (7) is controlled to be opened, and whether the battery to be detected has external leakage is judged through the flow change on the first flow meter (2).
10. The test method of claim 9, wherein:
when the battery to be tested is judged to have internal leakage through the pressure change on the first pressure gauge (4), the battery to be tested is also judged to have external leakage in an auxiliary manner through detecting the pressure change on the second pressure gauge (8);
or when the battery to be tested is judged to have internal leakage through the flow change on the first flowmeter (2), the battery to be tested is also judged to have external leakage in an auxiliary manner through detecting the flow change on the second flowmeter (6).
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Application publication date: 20200410 |