CN-116593084-B - Fuel cell air tightness detection structure and detection method thereof

CN116593084BCN 116593084 BCN116593084 BCN 116593084BCN-116593084-B

Abstract

The application relates to a fuel cell air tightness detection structure which is suitable for detecting leakage quantity of a fuel cell stack and comprises an air inlet unit, an air inlet pipeline unit, a first loop unit, a second loop unit and a test unit, wherein the air inlet unit is respectively connected with the air inlet pipeline unit and the test unit, the air inlet pipeline unit is respectively connected with the first loop unit and the second loop unit, the test unit is respectively connected with the first loop unit and the second loop unit, and the air inlet pipeline unit, the first loop unit and the second loop unit are respectively connected with the fuel cell stack. The application also provides a method for detecting the tightness of the fuel cell stack. According to the application, a double-loop structure is formed by the first loop unit and the second loop unit, and effective gas medium flow direction control is performed on the double-loop structure, so that the leakage value in the fuel cell stack can be effectively separated, and the reliability of the fuel cell airtight test is improved.

Inventors

ZHAO CHONGXI
GAO PENGRAN

Assignees

深圳市氢瑞燃料电池科技有限公司
深圳市雄韬电源科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230601

Claims (5)

1. The fuel cell tightness detection structure is characterized by being suitable for detecting the leakage quantity of a fuel cell stack and comprising an air inlet unit, an air inlet pipeline unit, a first loop unit, a second loop unit and a test unit; The air inlet unit is respectively connected with the air inlet pipeline unit and the test unit, the air inlet pipeline unit is respectively connected with the first loop unit and the second loop unit, the test unit is respectively connected with the first loop unit and the second loop unit, and the air inlet pipeline unit, the first loop unit and the second loop unit are respectively connected with the fuel cell stack; The air inlet unit comprises an air source, a first air pressure regulating valve, a second air pressure regulating valve, a third air pressure regulating valve, a first electromagnetic valve, a second electromagnetic valve and a pressure transmitter; the first air pressure regulating valve is respectively connected with the air source, the first electromagnetic valve and the second electromagnetic valve, the first electromagnetic valve is connected with the second air pressure regulating valve, the second electromagnetic valve is connected with the third air pressure regulating valve, and the pressure transmitter is respectively connected with the second air pressure regulating valve, the third air pressure regulating valve, the air inlet pipeline unit and the test unit; The pressure regulating range of the second air pressure regulating valve is larger than the pressure regulating range of the third air pressure regulating valve; The air inlet pipeline unit comprises a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic valve; The third electromagnetic valve is respectively connected with the pressure transmitter, the first loop unit and the second loop unit, the fourth electromagnetic valve is respectively connected with the pressure transmitter, the first loop unit and the second loop unit, and the fifth electromagnetic valve is respectively connected with the pressure transmitter, the first loop unit and the second loop unit; the first loop unit comprises a sixth electromagnetic valve, a seventh electromagnetic valve, an eighth electromagnetic valve, a ninth electromagnetic valve and a first gas outlet; The sixth electromagnetic valve is respectively connected with the third electromagnetic valve, the second loop unit and the test unit, the seventh electromagnetic valve is respectively connected with the fourth electromagnetic valve, the second loop unit and the test unit, the eighth electromagnetic valve is respectively connected with the fifth electromagnetic valve, the second loop unit and the test unit, and the ninth electromagnetic valve is respectively connected with the sixth electromagnetic valve, the seventh electromagnetic valve, the eighth electromagnetic valve, the first gas outlet and the test unit; the test unit comprises a tenth electromagnetic valve, an eleventh electromagnetic valve, a twelfth electromagnetic valve, a thirteenth electromagnetic valve, a fourteenth electromagnetic valve, a fifteenth electromagnetic valve, a first mass flowmeter, a second mass flowmeter and a third mass flowmeter; The tenth electromagnetic valve is respectively connected with the sixth electromagnetic valve, the seventh electromagnetic valve, the eighth electromagnetic valve, the ninth electromagnetic valve, the eleventh electromagnetic valve, the twelfth electromagnetic valve, the thirteenth electromagnetic valve, the fourteenth electromagnetic valve and the fifteenth electromagnetic valve; the eleventh electromagnetic valve is respectively connected with the pressure transmitter, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve; The thirteenth electromagnetic valve is connected with the second mass flowmeter, and the fourteenth electromagnetic valve is connected with the third mass flowmeter; The first mass flowmeter, the second mass flowmeter, the third mass flowmeter and the fifteenth solenoid valve are respectively connected with the second loop unit.
2. The fuel cell tightness detection structure according to claim 1, wherein the first mass flow meter, the second mass flow meter, and the third mass flow meter are respectively connected to the fuel cell stack.
3. The fuel cell tightness detection structure according to claim 2, wherein a flow rate range of the first mass flow meter is larger than a flow rate range of the second mass flow meter, and a flow rate range of the second mass flow meter is larger than a flow rate range of the third mass flow meter.
4. The fuel cell air tightness detection structure according to claim 3, wherein the second circuit unit includes a sixteenth electromagnetic valve, a seventeenth electromagnetic valve, an eighteenth electromagnetic valve, a nineteenth electromagnetic valve, and a second gas outlet; The sixteenth electromagnetic valve is respectively connected with the third electromagnetic valve, the sixth electromagnetic valve and the oxygen cavity of the fuel cell stack, the seventeenth electromagnetic valve is respectively connected with the fourth electromagnetic valve, the seventh electromagnetic valve and the hydrogen cavity of the fuel cell stack, and the eighteenth electromagnetic valve is respectively connected with the fifth electromagnetic valve, the eighth electromagnetic valve and the water cavity of the fuel cell stack; the nineteenth electromagnetic valve is respectively connected with the sixteenth electromagnetic valve, the seventeenth electromagnetic valve, the eighteenth electromagnetic valve, the first mass flowmeter, the second mass flowmeter, the third mass flowmeter, the fifteenth electromagnetic valve and the second gas outlet.
5. A method for detecting the tightness of a fuel cell stack, characterized in that the method for detecting the tightness of a fuel cell stack uses the structure for detecting the tightness of a fuel cell stack according to any one of claims 1 to 4.

Description

Fuel cell air tightness detection structure and detection method thereof Technical Field The invention relates to the technical field of fuel cells, in particular to a fuel cell air tightness detection structure and a detection method thereof. Background Fuel cells are chemical devices that directly convert chemical energy of fuel into electrical energy. In the fuel cell stack tightness test, the fuel cell stack tightness is usually detected by a flow method. At present, a flow method is adopted for placing two mass flow meters, namely, a first scheme is adopted for placing the mass flow meter at the inlet of a fuel cell stack detection cavity, detecting the volume of gas filled in real time by maintaining the pressure of the fuel cell stack detection cavity, thereby obtaining the leakage quantity of the fuel cell stack and judging whether the air tightness is qualified or not. And in the scheme II, the mass flowmeter is respectively arranged at the inlet and outlet of the fuel cell stack detection cavity, and the volume of the gas filled in real time is detected by maintaining the pressure of the fuel cell stack detection cavity, so that the leakage quantity of the fuel cell stack is obtained, and whether the air tightness is qualified is judged. In the first scheme, when the method is used for detecting the leakage quantity of the fuel cell stack, a larger error exists in the leakage value, so that serious interference is caused to the gas tightness safety standard judgment of the fuel cell stack, and the qualification rate of the fuel cell stack is affected. In the second scheme, although the error problem of the first scheme does not exist, the flow is complex, the installation is difficult, the cost is high, and the actual use requirement is difficult to meet. Disclosure of Invention Based on the above, the application provides a fuel cell air tightness detection structure and a detection method thereof, and aims to solve the technical problems of unreasonable structural arrangement, difficult installation, complex detection flow, detection errors and the like of the conventional fuel cell stack air tightness test device. The application has simple structure, reasonable arrangement of all parts, less number of used flowmeters and lower cost, and can effectively separate the internal leakage value of the fuel cell stack by adjusting the arrangement of all parts and the control strategy of the parts in the test process, thereby improving the reliability of the fuel cell stack air tightness test. In order to achieve the above purpose, the embodiment of the present invention proposes the following technical solutions: the fuel cell tightness detection structure is suitable for detecting the leakage quantity of a fuel cell stack and comprises an air inlet unit, an air inlet pipeline unit, a first loop unit, a second loop unit and a test unit; The air inlet unit is respectively connected with the air inlet pipeline unit and the test unit, the air inlet pipeline unit is respectively connected with the first loop unit and the second loop unit, the test unit is respectively connected with the first loop unit and the second loop unit, and the air inlet pipeline unit, the first loop unit and the second loop unit are respectively connected with the fuel cell stack. As a preferred embodiment, the air inlet unit comprises an air source, a first air pressure regulating valve, a second air pressure regulating valve, a third air pressure regulating valve, a first electromagnetic valve, a second electromagnetic valve and a pressure transmitter; the first air pressure regulating valve is respectively connected with the air source, the first electromagnetic valve and the second electromagnetic valve, the first electromagnetic valve is connected with the second air pressure regulating valve, the second electromagnetic valve is connected with the third air pressure regulating valve, and the pressure transmitter is respectively connected with the second air pressure regulating valve, the third air pressure regulating valve, the air inlet pipeline unit and the testing unit. In a preferred embodiment, the pressure adjustment range of the first air pressure adjusting valve is larger than the pressure adjustment range of the second air pressure adjusting valve, and the pressure adjustment range of the second air pressure adjusting valve is larger than the pressure adjustment range of the third air pressure adjusting valve. As a preferred embodiment, the intake line unit includes a third solenoid valve, a fourth solenoid valve, and a fifth solenoid valve; The third electromagnetic valve is respectively connected with the pressure transmitter, the first loop unit and the second loop unit, the fourth electromagnetic valve is respectively connected with the pressure transmitter, the first loop unit and the second loop unit, and the fifth electromagnetic valve is respectively connected with the pressure transmitter, the first loop un