Airtightness detection device for fuel cell stack

Abstract

The utility model discloses a fuel cell stack airtightness detection device, which comprises a substrate (1), a gas distribution structure for supplying gas to a stack is arranged on the substrate (1), a gas inlet joint (3) and a gas outlet joint (4) are arranged on the gas distribution structure, the gas distribution structure is a gas distribution plate (2) arranged on the substrate (1), the gas distribution plate (2) is matched with the stack, and the gas inlet joint (3) and the gas outlet joint (4) are arranged on the gas distribution plate (2). The gas distribution plate (2) is connected with the gas inlet joint (3) and the gas outlet joint (4); the gas distribution plate (2) is used for supplying gas and exhausting gas to the electric pile, meanwhile, the profiling gas distribution plate (2) is matched with the electric pile, the fuel cell electric pile is placed on the special tool to be sealed and then subjected to ventilation air tightness testing, the tool is further provided with positioning points and detection face profiling, the detection time is greatly shortened, the detection accuracy is also improved, and the detection efficiency is improved. The problems of installation dislocation and leakage of the airtight tool in the airtight detection process are solved, the leakage problem is solved, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles, and specifically relates to an airtightness detection device for a fuel cell stack. Background Art

[0002] Hydrogen fuel cells also have the advantages of being unaffected by temperature, having a longer driving range, and being able to refuel quickly. This is why they have become one of the main technical paths for the development of new energy vehicles in my country. The development of hydrogen fuel cells is changing with each passing day. Hydrogen fuel cells have stricter requirements for air tightness, among which the air tightness requirements of fuel cell stacks are even more stringent. In order to accurately and quickly perform air tightness testing on fuel cell stacks.

[0003] Patent No. 201921204330.7, published on September 11, 2020, discloses a fuel cell stack air tightness detection device. The utility model discloses a fuel cell stack air tightness detection device comprising a transparent outer shell, a hydrogen storage tank, and a coating that changes color upon contact with hydrogen. The transparent outer shell is disposed outside the fuel cell stack, and the coating is disposed on the inner sidewall of the transparent outer shell. The hydrogen storage tank is connected to the air inlet on the fuel cell stack via a pipeline, and the air outlet on the fuel cell stack is closed. The utility model discloses a fuel cell stack air tightness detection device that detects the air tightness of the fuel cell stack, utilizing the color difference of the reaction between hydrogen and copper oxide to quickly detect the location of a fuel cell stack leak. The device is lightweight and easy to operate, significantly saving costs and leak detection time.

[0004] In the prior art, air tightness testing usually takes a long time to install, and its air tightness is poor, which easily leads to errors in the results. Utility Model Content

[0005] The utility model aims to provide a fuel cell stack air tightness detection device with high detection efficiency and good air tightness.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a fuel cell stack air tightness detection device, including a substrate, the substrate is provided with a gas distribution structure for supplying gas to the stack, the gas distribution structure is provided with an air inlet connector and an air outlet connector, the gas distribution structure is a gas distribution plate arranged on the substrate, the gas distribution plate cooperates with the fuel cell, the gas distribution plate is connected to the air inlet connector and the air outlet connector, and the gas distribution plate is divided into a convex gas distribution plate and a flat gas distribution plate.

[0007] Positioning pins that match the battery stack are provided on the substrate, and the positioning pins are respectively located at opposite corners of the substrate.

[0008] A lifting plate is provided at the bottom of the base plate, and the lifting plate is connected to the cylinder.

[0009] A mounting plate is provided on the outside of the lifting plate, and a lifting groove matched with the lifting plate is provided in the mounting plate.

[0010] An anti-slip plate is provided at the end of the lifting plate.

[0011] The gas distribution plate is provided with a vent hole.

[0012] The gas distribution structure and the gas inlet connector are located on both sides of the base plate, and the gas outlet connector and the gas inlet connector are located on the same side of the base plate.

[0013] The convex gas distribution plate is in a convex shape, and the flat gas distribution plate is in a rectangular shape.

[0014] The technical effect of the utility model is: the fuel cell stack is placed on a special tooling and sealed before a ventilation test for air tightness. The tooling also has positioning points and detection surface profiling, which greatly reduces the detection time and improves the accuracy of the detection. It solves the problems of misalignment and leakage of the airtight tooling during the airtight detection process, solves the positioning problem, the leakage problem, and improves the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] This manual includes the following drawings, which show the following contents:

[0016] Figure 1 This is a schematic structural diagram of a fuel cell stack air tightness detection device according to the present invention;

[0017] Figure 2 for Figure 1 Schematic diagram of the air inlet and outlet connectors of a fuel cell stack air tightness detection device.

[0018] The markings in the figure are: 1. Base plate; 2. Air distribution plate; 21. Convex air distribution plate; 22. Flat air distribution plate; 3. Air inlet connector; 4. Air outlet connector; 5. Positioning pin; 6. Lifting plate; 7. Mounting plate; 8. Lifting slot; 9. Anti-slip plate; 10. Vent. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the specific implementation methods of the present invention by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution of the present invention and to facilitate its implementation.

[0020] See also Figure 1-2 A fuel cell stack air tightness detection device includes a substrate 1, on which is provided a gas distribution structure for supplying gas to the stack, on which is provided an air inlet connector 3 and an air outlet connector 4, the gas distribution structure being a gas distribution plate 2 arranged on the substrate 1, the gas distribution plate 2 being coordinated with the fuel cell stack, the gas distribution plate 2 being connected to the air inlet connector 3 and the air outlet connector 4, and the gas distribution plate 2 being divided into a convex gas distribution plate 21 and a flat gas distribution plate 22.

[0021] The fuel cell stack is placed on a special tooling and sealed before being tested for air tightness. The tooling also has positioning points and profiling of the detection surface, which greatly reduces the detection time and improves the accuracy of the detection. It solves the problems of misalignment and leakage of the airtight tooling during the airtight detection process, solves the leakage problem and improves the assembly efficiency. The gas distribution plate 2 is used to supply and exhaust gas to the stack, and the profiling gas distribution plate 2 is used to cooperate with the stack to solve the problems of installation misalignment and leakage. Two gas distribution plates 2 of different shapes are used to realize the positioning of the stack. At the same time, the convex gas distribution plate 21 and the flat gas distribution plate 22 are responsible for air intake and outlet respectively, which is convenient for guiding the flow of gas.

[0022] The base plate 1 is provided with positioning pins 5 that match the battery stack. The positioning pins 5 are respectively located at the diagonal corners of the base plate 1. The positioning pins 5 are used to position the battery stack to prevent installation misalignment.

[0023] A lifting plate 6 is provided at the bottom of the base plate 1, which is connected to a cylinder. To begin the stack airtightness test, the stack to be tested is first placed on the gas distribution plate 2, aligned with the positioning pin 5. The lifting plate 6 then descends to a fixed position and locks. Pressure is then applied to the top of the stack to seal it between the stack and the gas distribution plate 2. The gas source enters the gas distribution plate 2 through the inlet connector 3 and is introduced into the stack. When the pressure reaches a certain level, the inlet and outlet ports are closed, and the test is performed according to the set parameters. After the test is completed, the gas outlet connector 4 is opened to discharge the test gas. The press on the stack is opened, and the lifting plate 6 rises to remove the stack, completing the test.

[0024] A mounting plate 7 is provided on the outside of the lifting plate 6, and a lifting groove 8 matching the lifting plate 6 is provided inside the mounting plate 7; the mounting plate 7 is installed on the factory's infrastructure to stabilize the overall structure.

[0025] An anti-slip plate 9 is provided at the end of the lifting plate 6 to prevent the lifting plate 6 from being separated from the mounting plate 7 during lifting.

[0026] The air distribution plate 2 is provided with an air vent 10 ; air intake and air exhaust are achieved through the air vent 10 .

[0027] The gas distribution structure and the gas inlet connector 3 are located on both sides of the base plate 1, and the gas outlet connector 4 and the gas inlet connector 3 are located on the same side of the base plate 1; this facilitates connection with the gas pipe and avoids mutual obstruction between the gas pipe and the battery stack.

[0028] The convex gas distribution plate 21 is in a convex shape, and the flat gas distribution plate 22 is in a rectangular shape; the gas distribution plate 2 is set to a contoured structure to avoid misalignment.

[0029] The technical effect of the utility model is: the fuel cell stack is placed on a special tooling and sealed before a ventilation test for air tightness. The tooling also has positioning points and detection surface profiling, which greatly reduces the detection time and improves the accuracy of the detection. It solves the problems of misalignment and leakage of the airtight tooling during the airtight detection process, solves the positioning problem, the leakage problem, and improves the assembly efficiency.

[0030] The above description of the present invention is provided as an example, in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. A fuel cell stack airtightness detection device, characterized in that: The invention comprises a base plate (1), wherein the base plate (1) is provided with a gas distribution structure for supplying gas to a fuel cell stack, wherein the gas distribution structure is provided with an air inlet connector (3) and an air outlet connector (4), wherein the gas distribution structure is a gas distribution plate (2) arranged on the base plate (1), wherein the gas distribution plate (2) cooperates with the fuel cell stack, wherein the gas distribution plate (2) is connected to the air inlet connector (3) and the air outlet connector (4), and wherein the gas distribution plate (2) is divided into a convex gas distribution plate (21) and a flat gas distribution plate (22).

2. A fuel cell stack airtightness detection device according to claim 1, characterized in that: Positioning pins (5) that match the battery stack are provided on the substrate (1), and the positioning pins (5) are respectively located at opposite corners of the substrate (1).

3. A fuel cell stack airtightness detection device according to claim 1, characterized in that: A lifting plate (6) is provided at the bottom of the base plate (1), and the lifting plate (6) is connected to the cylinder.

4. A fuel cell stack airtightness detection device according to claim 3, characterized in that: A mounting plate (7) is provided on the outside of the lifting plate (6), and a lifting groove (8) matching with the lifting plate (6) is provided inside the mounting plate (7).

5. A fuel cell stack airtightness detection device according to claim 3 or 4, characterized in that: An anti-slip plate (9) is provided at the end of the lifting plate (6).

6. The fuel cell stack airtightness detection device according to claim 1, characterized in that: The gas distribution plate (2) is provided with a vent hole (10).

7. The fuel cell stack airtightness detection device according to claim 1, characterized in that: The gas distribution structure and the gas inlet connector (3) are located on both sides of the base plate (1), and the gas outlet connector (4) and the gas inlet connector (3) are located on the same side of the base plate (1).

8. The fuel cell stack airtightness detection device according to claim 1, characterized in that: The convex gas distribution plate (21) is in a convex shape, and the flat gas distribution plate (22) is in a rectangular shape.

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