CN108168790B - Leakage detection device for fuel cell stack - Google Patents
Leakage detection device for fuel cell stack Download PDFInfo
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- CN108168790B CN108168790B CN201711462945.5A CN201711462945A CN108168790B CN 108168790 B CN108168790 B CN 108168790B CN 201711462945 A CN201711462945 A CN 201711462945A CN 108168790 B CN108168790 B CN 108168790B
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- Prior art keywords
- cabinet body
- water tank
- fuel cell
- cell stack
- water
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- 239000000446 fuel Substances 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
Classifications
-
- 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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to a leakage detection device for a fuel cell stack, which comprises a water vapor supply unit, a leakage detection unit and a drainage unit which are sequentially connected, wherein the water vapor supply unit comprises a first cabinet body, a pipeline system arranged in the first cabinet body and a control system arranged on the first cabinet body, the leakage detection unit comprises a second cabinet body and a water tank leakage detection mechanism which is rotatably arranged on the second cabinet body and is communicated with the pipeline system, and the drainage unit comprises a third cabinet body and a water tank drainage mechanism which is arranged on the third cabinet body and is communicated with the water tank leakage detection mechanism. Compared with the prior art, the invention can judge the air tightness of the fuel cell stack according to the pressure difference of the gas before and after leakage detection, can accurately and rapidly locate the leakage part of the fuel cell stack according to the bubble condition in the water tank, is convenient for rapidly overhauling the fuel cell stack, and has simple and convenient operation, safety and reliability.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and relates to a leakage detection device for a fuel cell stack.
Background
With the explosive development of the automotive hydrogen fuel cell industry, the demand of corresponding fuel cell stacks is continuously increasing. The tightness of the cell stack has a great influence on the performance of the fuel cell, so that the tightness of the cell stack needs to be detected during the production process of the cell stack. However, at present, no standard method and equipment for detecting the tightness of the electric pile exist in the industry, and the quality of detection of the electric pile by each manufacturer is uneven, so that some electric piles cannot be used normally, and the performance of the fuel cell is affected; meanwhile, some manufacturers have complicated modes in the aspect of pile air tightness detection, the steps are complicated, and the production cost is increased.
Disclosure of Invention
The present invention is directed to a leak detection apparatus for a fuel cell stack that overcomes the above-described deficiencies of the prior art.
The aim of the invention can be achieved by the following technical scheme:
The device comprises a water-gas supply unit, a leakage detection unit and a drainage unit which are sequentially connected, wherein the water-gas supply unit comprises a first cabinet body, a pipeline system arranged in the first cabinet body and a control system arranged on the first cabinet body, the leakage detection unit comprises a second cabinet body and a water tank leakage detection mechanism which is rotationally arranged on the second cabinet body and communicated with the pipeline system, and the drainage unit comprises a third cabinet body and a water tank drainage mechanism which is arranged on the third cabinet body and communicated with the water tank leakage detection mechanism. The fuel cell stack is placed in a water tank leakage detecting mechanism, water and leakage detecting gas required by leakage detection are provided for the water tank leakage detecting mechanism by a pipeline system, a control system controls the leakage detecting process, and after the leakage detection is finished, water in the water tank leakage detecting mechanism is discharged into a water tank drainage mechanism. When leakage detection is performed, the water tank leakage detection mechanism can rotate on the second cabinet body, so that operators can observe the fuel cell stack from all directions.
Further, the first cabinet body, the second cabinet body and the third cabinet body are sequentially and fixedly connected together. The first cabinet body, the second cabinet body and the third cabinet body can be designed into a whole.
Further, universal wheels are arranged at the bottoms of the first cabinet body and the third cabinet body. The universal wheel is convenient for the integral movement of the device.
Further, the pipeline system comprises a water supply pipe, an air supply pipe and an air exhaust pipe which are arranged in the first cabinet body, wherein the outer wall of the first cabinet body is provided with a water tap communicated with the water supply pipe, an air inlet connecting pipe communicated with the air supply pipe and an air outlet connecting pipe communicated with the air exhaust pipe. The tap provides the water needed by the leak detection of the water tank leak detection mechanism, and the air inlet connecting pipe and the air outlet connecting pipe are respectively connected with the air inlet and the air outlet of the fuel cell stack.
As the preferable technical scheme, a water tank communicated with a water supply pipe and a gas storage bottle communicated with a gas supply pipe are arranged in the first cabinet body. When the external water source and the air source are inconvenient to access, the water tank and the air storage bottle in the first cabinet body can be utilized to provide water and leakage detection gas.
As a preferable technical scheme, the pressure reducing valve is arranged on the air supply pipe. The pressure reducing valve is convenient for adjusting the intake pressure.
Further, the control system comprises a flowmeter and a pressure gauge which are arranged on the first cabinet body and are respectively communicated with the air supply pipe. The flowmeter and the pressure gauge can respectively display the flow rate and the pressure of the gas.
As a preferable technical scheme, the flowmeter is a rotameter.
As an optimal technical scheme, the control system further comprises a touch screen and a power switch, wherein the touch screen and the power switch are arranged on the first cabinet body. The power switch control device is powered on and powered off, the touch screen controls the leakage detection process, and the working state is monitored.
Further, the water tank leakage detecting mechanism comprises a rotary table rotatably arranged on the second cabinet body and a water tank arranged on the rotary table. The fuel cell stack is placed in the water tank, the fuel cell stack is immersed in water, if the fuel cell stack leaks, bubbles in the water can be quickly found, and the water tank can be rotated by the turntable so as to observe and locate the leaking part of the fuel cell stack.
As the preferable technical scheme, a bearing is arranged between the turntable and the top of the second cabinet body so as to reduce the friction force when the turntable and the second cabinet body relatively rotate.
As an optimal technical scheme, a liquid level sensor electrically connected with a faucet is arranged in the water tank. When the liquid level in the water tank reaches the preset height, the water tap is automatically closed.
Further, the top end of the water tank is provided with an opening, the bottom of the water tank is provided with a water outlet pipe, and the water outlet pipe is provided with a water drain valve. The top end opening of the water tank is convenient for a water tap to add water into the water tank and for the fuel cell stack to be connected with the air inlet connecting pipe and the air outlet connecting pipe, and the water outlet pipe and the water drain valve are convenient for discharging water in the water tank after leak detection is finished.
Further, the water tank is a transparent water tank, and an illumination lamp matched with the water tank is arranged on the outer wall of the first cabinet body. The transparent water tank is convenient for observing the fuel cell stack from each side, and the illuminating lamp is convenient for providing illumination when light is darker, so that bubbles of the fuel cell stack in the water tank are more obvious.
Further, the water tank drainage mechanism comprises a water tank arranged on the third cabinet body. After the leak detection is finished, water in the water tank is discharged into the water tank.
Further, a water outlet is formed in the bottom of the water tank, and the water tank drainage mechanism further comprises a water storage barrel which is arranged in the third cabinet body and located below the water outlet. When the external drainage system is inconvenient to access, the water discharged into the water tank is temporarily stored in the water storage barrel, so that the leakage detection process is prevented from being influenced.
As a preferred technical solution, the device further comprises a conveyor and a crane. The fuel cell stack is transported to the water tank by a conveyor, and then lifted up by a crane and placed in the water tank.
In practical application, the fuel cell pile is placed in the water tank (if the pile is too heavy, the pile can be lifted by a crane), the fuel cell pile is connected with the air inlet connecting pipe and the air outlet connecting pipe, water is added into the water tank by utilizing the water tap, so that the water surface overflows the highest position of the fuel cell pile, whether bubbles exist on the surface of the fuel cell pile or not is observed, and the size and the position of the bubbles are recorded; introducing leakage detection gas into the fuel cell stack, regulating the air inlet pressure to 3-4bar, observing whether bubbles exist on the surface of the fuel cell stack, and recording the size and the position of the bubbles so as to judge whether the fuel cell stack has an external leakage phenomenon and determine the external leakage position; adjusting the pressure of the air inlet to 100KPaG, keeping the pressure stable for at least 1min, closing the air inlet, recording the pressure of the air after a period of time, and judging the air tightness of the fuel cell stack according to the pressure difference between the front and the back; after the leak detection is finished, water in the water tank is discharged into the water tank, and the fuel cell stack is taken out.
Compared with the prior art, the invention has the following characteristics:
1) The method can judge the air tightness of the fuel cell stack according to the pressure difference of the gas before and after leakage detection, can accurately and rapidly locate the leakage part of the fuel cell stack according to the bubble condition in the water tank, is convenient for rapidly overhauling the fuel cell stack, and is simple and convenient to operate;
2) The device can be moved to a preset position according to actual needs, and leakage detection can be carried out on fuel cell stacks at different positions, so that the flexibility is good;
3) When leakage detection is performed, the operation area and the observation area are arranged left and right, so that the operation control and the observation of the fuel cell stack are separated, the mutual influence is avoided, and the safety and the reliability are realized.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a front view structure of the present invention;
The figure indicates:
1-first cabinet body, 2-second cabinet body, 3-third cabinet body, 4-universal wheel, 5-tap, 6-inlet connection pipe, 7-outlet connection pipe, 8-flowmeter, 9-manometer, 10-carousel, 11-water tank, 12-outlet pipe, 13-light, 14-basin, 15-delivery port.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Examples:
The leakage detection device for the fuel cell stack comprises a water-gas supply unit, a leakage detection unit and a drainage unit which are sequentially connected, wherein the water-gas supply unit comprises a first cabinet body 1, a pipeline system arranged in the first cabinet body 1 and a control system arranged on the first cabinet body 1, the leakage detection unit comprises a second cabinet body 2 and a water tank leakage detection mechanism which is rotatably arranged on the second cabinet body 2 and communicated with the pipeline system, and the drainage unit comprises a third cabinet body 3 and a water tank drainage mechanism which is arranged on the third cabinet body 3 and communicated with the water tank leakage detection mechanism.
Wherein, the first cabinet body 1, the second cabinet body 2 and the third cabinet body 3 are fixedly connected together in sequence. The bottoms of the first cabinet body 1 and the third cabinet body 3 are respectively provided with a universal wheel 4.
The pipeline system comprises a water supply pipe, an air supply pipe and an air exhaust pipe which are arranged in the first cabinet body 1, wherein the outer wall of the first cabinet body 1 is provided with a water tap 5 communicated with the water supply pipe, an air inlet connecting pipe 6 communicated with the air supply pipe and an air outlet connecting pipe 7 communicated with the air exhaust pipe.
The control system comprises a flowmeter 8 and a pressure gauge 9 which are arranged on the first cabinet body 1 and are respectively communicated with the air supply pipe.
The water tank leak detection mechanism includes a turntable 10 rotatably provided on the second tank body 2, and a water tank 11 provided on the turntable 10. The top end of the water tank 11 is opened, the bottom is provided with a water outlet pipe 12, and the water outlet pipe 12 is provided with a water drain valve. The water tank 11 is a transparent water tank, and the outer wall of the first cabinet body 1 is provided with an illuminating lamp 13 which is matched with the water tank 11.
The sink drain mechanism includes a sink 14 provided on the third cabinet 3. A water outlet 15 is arranged at the bottom of the water tank 14, and the water tank drainage mechanism further comprises a water storage barrel which is arranged in the third cabinet body 3 and is positioned below the water outlet 15.
In practical application, the fuel cell stack is placed in a water tank 11 (if the stack is overweight, the fuel cell stack can be lifted by a crane), the fuel cell stack is connected with an air inlet connecting pipe 6 and an air outlet connecting pipe 7, water is added into the water tank 11 by a water tap 5, so that the water surface overflows the highest position of the fuel cell stack, whether bubbles exist on the surface of the fuel cell stack or not is observed, and the size and the position of the bubbles are recorded; introducing leakage detection gas into the fuel cell stack, regulating the air inlet pressure to 3-4bar, observing whether bubbles exist on the surface of the fuel cell stack, and recording the size and the position of the bubbles so as to judge whether the fuel cell stack has an external leakage phenomenon and determine the external leakage position; adjusting the pressure of the air inlet to 100KPaG, keeping the pressure stable for 1min, closing the air inlet, recording the pressure of the air after a period of time, and judging the air tightness of the fuel cell stack according to the pressure difference between the front and the back; after the leak detection is finished, the water in the water tank 11 is discharged into the water tank 14, and the fuel cell stack is taken out.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (6)
1. The leakage detection device for the fuel cell stack is characterized by comprising a water and gas supply unit, a leakage detection unit and a drainage unit which are sequentially connected, wherein the water and gas supply unit comprises a first cabinet body (1), a pipeline system arranged in the first cabinet body (1) and a control system arranged on the first cabinet body (1), the leakage detection unit comprises a second cabinet body (2) and a water tank leakage detection mechanism which is rotatably arranged on the second cabinet body (2) and communicated with the pipeline system, and the drainage unit comprises a third cabinet body (3) and a water tank drainage mechanism which is arranged on the third cabinet body (3) and communicated with the water tank leakage detection mechanism;
the pipeline system comprises a water supply pipe, an air supply pipe and an air exhaust pipe which are arranged in the first cabinet body (1), wherein a water tap (5) communicated with the water supply pipe, an air inlet connecting pipe (6) communicated with the air supply pipe and an air outlet connecting pipe (7) communicated with the air exhaust pipe are arranged on the outer wall of the first cabinet body (1);
The control system comprises a flowmeter (8) and a pressure gauge (9) which are arranged on the first cabinet body (1) and are respectively communicated with the air supply pipe, and the air inlet pressure is regulated and controlled to be 3-4bar or 100KPaG during detection;
the water tank leakage detection mechanism comprises a rotary table (10) rotatably arranged on the second cabinet body (2) and a water tank (11) arranged on the rotary table (10);
the water tank drainage mechanism comprises a water tank (14) arranged on the third cabinet body (3);
When the leakage detection device is in practical application, the fuel cell stack is arranged in the water tank (11) and is connected with the air inlet connecting pipe (6) and the air outlet connecting pipe (7), water is added into the water tank (11) through the water tap (5), so that the water surface passes through the highest position of the fuel cell stack, whether bubbles exist on the surface of the fuel cell stack or not is observed, and the size and the position of the bubbles are recorded; introducing leakage detection gas into the fuel cell stack, regulating the air inlet pressure to be 3-4bar, observing whether bubbles exist on the surface of the fuel cell stack, and recording the size and the position of the bubbles so as to judge whether the fuel cell stack has an external leakage phenomenon and determine the external leakage position; adjusting the pressure of the air inlet to 100KPaG, keeping the pressure stable for 1min, closing the air inlet, recording the pressure of the air, and judging the air tightness of the fuel cell stack according to the front-back pressure difference; after the leak detection is finished, water in the water tank (11) is discharged into the water tank (14), and the fuel cell stack is taken out.
2. The leakage detection device for the fuel cell stack according to claim 1, wherein the first cabinet body (1), the second cabinet body (2) and the third cabinet body (3) are fixedly connected together in sequence.
3. The leakage detection device for the fuel cell stack according to claim 2, wherein universal wheels (4) are arranged at the bottoms of the first cabinet body (1) and the third cabinet body (3).
4. The leakage detection device for the fuel cell stack according to claim 1, wherein a water outlet pipe (12) is arranged at the bottom of the top opening of the water tank (11), and a water drain valve is arranged on the water outlet pipe (12).
5. The leakage detection device for the fuel cell stack according to claim 1, wherein the water tank (11) is a transparent water tank, and the outer wall of the first cabinet body (1) is provided with a lighting lamp (13) matched with the water tank (11).
6. The leakage detection device for the fuel cell stack according to claim 1, wherein the water tank (14) is provided with a water outlet (15) at the bottom, and the water tank drainage mechanism further comprises a water storage barrel arranged in the third cabinet body (3) and positioned below the water outlet (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711462945.5A CN108168790B (en) | 2017-12-28 | 2017-12-28 | Leakage detection device for fuel cell stack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711462945.5A CN108168790B (en) | 2017-12-28 | 2017-12-28 | Leakage detection device for fuel cell stack |
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| Publication Number | Publication Date |
|---|---|
| CN108168790A CN108168790A (en) | 2018-06-15 |
| CN108168790B true CN108168790B (en) | 2024-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711462945.5A Active CN108168790B (en) | 2017-12-28 | 2017-12-28 | Leakage detection device for fuel cell stack |
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| CN (1) | CN108168790B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220654A (en) * | 2019-05-27 | 2019-09-10 | 中汽研汽车检验中心（天津）有限公司 | A kind of fuel cell air tightness test-bed |
| CN111579173B (en) * | 2020-05-21 | 2021-03-19 | 东风汽车集团有限公司 | Automatic detection equipment and detection method for three-cavity pressure maintaining air tightness of fuel cell system |
| CN111982420B (en) * | 2020-08-18 | 2022-08-26 | 厦门晋简新能源科技有限公司 | Fuel cell stack differential pressure type air leakage testing device and testing method |
| CN114441105A (en) * | 2022-01-18 | 2022-05-06 | 潍柴动力股份有限公司 | Fuel cell stack bipolar plate water cavity air tightness detection device and method |
| CN116754142B (en) * | 2023-08-12 | 2023-11-03 | 深圳市惠华欣电池科技有限公司 | Soft package battery packaging detection device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134644A (en) * | 2013-01-29 | 2013-06-05 | 昆山弗尔赛能源有限公司 | Rapid gas tightness testing equipment of fuel cell stack |
| CN206540669U (en) * | 2017-03-15 | 2017-10-03 | 宁德时代新能源科技股份有限公司 | Overpressure resistance detecting device |
| CN207703410U (en) * | 2017-12-28 | 2018-08-07 | 上海神力科技有限公司 | A kind of leakage detection apparatus for fuel cell pile |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3447720B2 (en) * | 2001-06-01 | 2003-09-16 | 本田技研工業株式会社 | Airtight inspection device |
| JP5007778B2 (en) * | 2004-12-16 | 2012-08-22 | 株式会社エクォス・リサーチ | Fuel cell system |
| CN2901275Y (en) * | 2006-02-14 | 2007-05-16 | 深圳市比克电池有限公司 | Detector for lithium cell seal property |
| JP5612872B2 (en) * | 2010-03-01 | 2014-10-22 | 株式会社ティーエス | Plate-shaped molding / joint leak inspection system |
| CN104713684B (en) * | 2013-12-17 | 2017-08-25 | 上海航天设备制造总厂 | The ultralow temperature leak test method of accumulator |
| CN203981371U (en) * | 2014-07-09 | 2014-12-03 | 青岛亚通达铁路设备有限公司 | Cell sealing pick-up unit |
| CN205280312U (en) * | 2015-12-21 | 2016-06-01 | 北京中海航博科技有限公司 | Airtight inspection control cabinet |
| CN205826234U (en) * | 2016-07-25 | 2016-12-21 | 天津力神电池股份有限公司 | A kind of battery leakage measuring device |
| CN106840547A (en) * | 2017-03-30 | 2017-06-13 | 杭州电子科技大学 | A kind of batteries of electric automobile bag air-tightness detection device and detection method |
-
2017
- 2017-12-28 CN CN201711462945.5A patent/CN108168790B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134644A (en) * | 2013-01-29 | 2013-06-05 | 昆山弗尔赛能源有限公司 | Rapid gas tightness testing equipment of fuel cell stack |
| CN206540669U (en) * | 2017-03-15 | 2017-10-03 | 宁德时代新能源科技股份有限公司 | Overpressure resistance detecting device |
| CN207703410U (en) * | 2017-12-28 | 2018-08-07 | 上海神力科技有限公司 | A kind of leakage detection apparatus for fuel cell pile |
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