Device for rapid detection of welding leaks in active areas of hydrogen fuel cell bipolar plates

Abstract

The utility model relates to a kind of welding leak point quick detection device of hydrogen fuel cell bipolar plate active area, base is equipped in water tank, outer side plate and inner side plate are equipped with being fixed together on base, outer side plate observation window is opened in outer side plate, outer side plate sealing groove is opened in the inner side of outer side plate and around outer side plate observation window, outer side plate sealing strip is equipped in outer side plate sealing groove;Inner side plate observation window is opened in inner side plate, inner side plate sealing groove is opened in the outer side of inner side plate and around inner side plate observation window, inner side plate sealing strip is equipped in inner side plate sealing groove;Air pipe joint is installed on inner side plate, inner side plate gas outlet is equipped on the outer side of inner side plate, and inner side plate sealing strip completely surrounds inner side plate gas outlet.The utility model can quickly identify the leak point on bipolar plate by bubbling method, accurately confirm the position of failure welding point on bipolar plate, quickly find the reason of welding failure, and improve the efficiency of subsequent production.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, and specifically discloses a rapid detection device for welding leaks in the active area of ​​a bipolar plate in a hydrogen fuel cell. Background Technology

[0002] A hydrogen fuel cell is a device that directly converts chemical energy into electrical energy. The bipolar plate is the core component of the fuel cell, in which hydrogen and oxygen undergo electrochemical reactions on the anode and cathode sides, respectively, to produce water, heat, and electricity output. The quality of the bipolar plate directly affects the quality of the hydrogen fuel cell.

[0003] Metal bipolar plates are formed by welding anode and cathode plates, creating three independent chambers: a hydrogen chamber, a cooling water chamber, and an air chamber. Welding is one method of connecting the plates, and there are numerous weld points in the flow channel area. During the welding process, cross-leakage and external leakage between the three chambers can occur. Once a metal bipolar plate is damaged, causing gas or coolant leakage, it can have irreversible effects on the fuel cell stack. Therefore, leak detection of metal bipolar plates is a crucial part of bipolar plate production.

[0004] Existing airtight equipment uses differential pressure or flow rate methods to test whether the electrode plates are leaking in order to determine whether the bipolar plate welding has failed. However, since there are 200 to 600 weld points in the active area of ​​a metal bipolar plate, it is not possible to visually identify the welding leak points and quickly find the cause of the welding failure. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a rapid detection device for welding leaks in the active area of ​​a hydrogen fuel cell bipolar plate.

[0006] According to the technical solution provided by this utility model, the rapid detection device for welding leaks in the active area of ​​the bipolar plate of the hydrogen fuel cell includes a water tank, a base, an outer side plate, an inner side plate, an outer side plate sealing strip, an inner side plate sealing strip, and a gas pipe connector. A base is provided inside the water tank, and an outer side plate and an inner side plate are fixed together on the base. An outer side plate observation window is provided on the outer side plate, and an outer side plate sealing groove is provided on the inner side of the outer side plate and around the outer side plate observation window. An outer side plate sealing strip is provided in the outer side plate sealing groove. An inner side panel observation window is provided on the inner side panel, and an inner side panel sealing groove is provided on the outer side of the inner side panel and around the inner side panel observation window. An inner side panel sealing strip is provided in the inner side panel sealing groove. An air pipe connector is installed on the inner side plate, and an air outlet is provided on the outer side of the inner side plate. The sealing strip of the inner side plate completely surrounds the air outlet of the inner side plate.

[0007] Preferably, outer panel handles are fixed on both the left and right sides of the outer side of the outer panel.

[0008] Preferably, an inner side plate handle is fixed to the upper end of the inner side plate.

[0009] Preferably, elongated outer panel sealing grooves are provided on the inner surfaces of the outer panels above and below the observation window of the outer panel, and grid-like outer panel sealing grooves are provided on the inner surfaces of the outer panels to the left and right of the observation window of the outer panel.

[0010] Preferably, elongated inner side panel sealing grooves are provided on the outer surfaces of the inner side panels above and below the observation window of the inner side panel, and grid-shaped inner side panel sealing grooves are provided on the outer surfaces of the inner side panels to the left and right of the observation window of the inner side panel, with the air outlet of the inner side panel located within the grid of the grid-shaped inner side panel sealing groove.

[0011] This invention uses the bubbling method to quickly identify leakage points on bipolar plates, accurately pinpointing the location of failed solder joints on the bipolar plates, rapidly identifying the cause of solder failure, and improving the efficiency of subsequent production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a perspective view of the outer side plate in this utility model.

[0014] Figure 3 This is a structural diagram of the inner side of the outer side plate in this utility model.

[0015] Figure 4 This is a perspective view of the inner side plate in this utility model.

[0016] Figure 5 This is a structural diagram of the outer side of the inner side plate in this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] A rapid detection device for weld leaks in the active region of a hydrogen fuel cell bipolar plate, such as... Figure 1As shown, it includes a water tank 1, a base 2, an outer side plate 3, an inner side plate 4, an outer side plate sealing strip 5, an inner side plate sealing strip 6, and an air pipe connector 7; like Figure 2 and Figure 3 As shown, a base 2 is provided inside the water tank 1. An outer side plate 3 and an inner side plate 4 are fixed together on the base 2. An outer side plate observation window 3.1 is provided on the outer side plate 3. The welding point of the bipolar plate can be easily located through the outer side plate observation window 3.1. An outer side plate sealing groove 3.2 is provided on the inner side of the outer side plate 3 and around the outer side plate observation window 3.1. An outer side plate sealing strip 5 is provided in the outer side plate sealing groove 3.2. The outer side plate sealing strip 5 serves to seal the outer side of the bipolar plate. like Figure 4 and Figure 5 As shown, an inner side plate observation window 4.1 is provided on the inner side plate 4. The bipolar plate welding point can be easily located through the inner side plate observation window 4.1. An inner side plate sealing groove 4.2 is provided on the outer side of the inner side plate 4 and around the inner side plate observation window 4.1. An inner side plate sealing strip 6 is provided in the inner side plate sealing groove 4.2. The inner side plate sealing strip 6 serves to seal the inner side of the bipolar plate. An air pipe connector 7 is installed on the inner side plate 4, and an inner side plate air outlet 4.3 is provided on the outer side of the inner side plate 4. The inner side plate sealing strip 6 completely surrounds the inner side plate air outlet 4.3.

[0019] Outer panel handles 8 are fixed on the left and right sides of the outer side of the outer panel 3, allowing for easy removal and placement of the outer panel 3.

[0020] An inner side plate handle 9 is fixed to the upper end of the inner side plate 4, which allows for easy handling of the inner side plate 4.

[0021] Long strip-shaped outer panel sealing grooves 3.2 are provided on the inner sides of the outer panel 3 above and below the outer panel observation window 3.1, and grid-shaped outer panel sealing grooves 3.2 are provided on the inner sides of the outer panel 3 to the left and right of the outer panel observation window 3.1.

[0022] Long strip-shaped inner side plate sealing grooves 4.2 are provided on the outer surfaces of the inner side plate 4 above and below the inner side plate observation window 4.1. Mesh-shaped inner side plate sealing grooves 4.2 are provided on the outer surfaces of the inner side plate 4 to the left and right of the inner side plate observation window 4.1. The inner side plate air outlet 4.3 is located within the mesh of the mesh-shaped inner side plate sealing grooves 4.2.

[0023] In use, the bipolar plate is first placed on the inner plate 4, with its inner surface engaging with the inner plate sealing strip 6. The outer plate 3 is then engaged with the inner plate 4 via a positioning pin, and the outer surface of the bipolar plate engages with the outer plate sealing strip 5. Bolts are then used to secure the inner plate 4 and the outer plate 3 together. The air inlet pipe is connected to the air pipe connector 7, and the leak detection fixture is placed on the base 2 inside the water tank 1. In this embodiment, the water tank 1 is used as the bubble detection mechanism for detecting leaks in the metal bipolar plate. The method is not limited to using methods that facilitate bubble observation, such as colored leak test liquid, soap bubbles, or liquids that generate bubbles.

[0024] Secondly, compressed gas is connected through the air inlet pipe, and a certain amount of compressed air is introduced through the air pipe connector 7 and the air outlet 4.3 of the inner side plate. By observing the bubbles on the surface of the active area of ​​the bipolar plate through the observation window 3.1 of the outer side plate and the observation window 4.1 of the inner side plate, the leakage point on the bipolar plate is identified, and the failed welding point is confirmed.

[0025] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rapid detection device for weld leaks in the active region of a hydrogen fuel cell bipolar plate, comprising a water tank (1), a base (2), an outer side plate (3), an inner side plate (4), an outer side plate sealing strip (5), an inner side plate sealing strip (6), and a gas pipe connector (7); characterized in that: exist The water tank (1) is provided with a base (2), and an outer side plate (3) and an inner side plate (4) are fixed together on the base (2). An outer side plate observation window (3.1) is provided on the outer side plate (3). An outer side plate sealing groove (3.2) is provided on the inner side of the outer side plate (3) and around the outer side plate observation window (3.1). An outer side plate sealing strip (5) is provided in the outer side plate sealing groove (3.2). An inner side plate observation window (4.1) is provided on the inner side plate (4), and an inner side plate sealing groove (4.2) is provided on the outer side of the inner side plate (4) and around the inner side plate observation window (4.1). An inner side plate sealing strip (6) is provided in the inner side plate sealing groove (4.2). An air pipe connector (7) is installed on the inner side plate (4), and an inner side plate air outlet (4.3) is provided on the outer side of the inner side plate (4). The inner side plate sealing strip (6) completely surrounds the inner side plate air outlet (4.3).

2. The rapid detection device for welding leaks in the active region of a hydrogen fuel cell bipolar plate as described in claim 1, characterized in that: Outer plate handles (8) are fixed on both the left and right sides of the outer side of the outer plate (3).

3. The rapid detection device for welding leaks in the active region of a hydrogen fuel cell bipolar plate as described in claim 1, characterized in that: An inner side plate handle (9) is fixed to the upper end of the inner side plate (4).

4. The rapid detection device for welding leaks in the active region of a hydrogen fuel cell bipolar plate as described in claim 1, characterized in that: in Long strip-shaped outer panel sealing grooves (3.2) are provided on the inner sides of the outer panel (3) above and below the outer panel observation window (3.1), and grid-shaped outer panel sealing grooves (3.2) are provided on the inner sides of the outer panel (3) on the left and right sides of the outer panel observation window (3.1).

5. The rapid detection device for welding leaks in the active region of a hydrogen fuel cell bipolar plate as described in claim 1, characterized in that: Long strip-shaped inner side plate sealing grooves (4.2) are provided on the outer side surfaces of the inner side plate (4) above and below the inner side plate observation window (4.1), and grid-shaped inner side plate sealing grooves (4.2) are provided on the outer side surfaces of the inner side plate (4) to the left and right of the inner side plate observation window (4.1). The inner side plate air outlet (4.3) is located within the grid of the grid-shaped inner side plate sealing grooves (4.2).

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