Multi-layer bipolar plate density measuring tool

Abstract

The utility model discloses a multilayer bipolar plate density measuring tool which comprises an upper cover plate, a middle cover plate and a lower cover plate, the upper surface of the middle cover plate is provided with a first bipolar plate fixing area, and the lower surface of the middle cover plate is provided with a second bipolar plate covering area; an oxygen channel, a hydrogen channel and a water channel are arranged in the middle cover plate, and three connectors corresponding to ventilation of the oxygen channel, the hydrogen channel and the water channel are arranged on the side edge of the middle cover plate. A first upper air outlet, a second upper air outlet and a third upper air outlet are formed in the upper surface of the middle cover plate; a first lower air outlet, a second lower air outlet and a third lower air outlet are formed in the lower surface of the middle cover plate; a first bipolar plate covering area is arranged on the lower surface of the upper cover plate; a second bipolar plate fixing area is arranged on the upper surface of the lower cover plate; a first bipolar plate to be detected is detected on the upper surfaces of the upper cover plate and the middle cover plate, and a second bipolar plate to be detected is detected between the lower surface of the middle cover plate and the lower cover plate.

Description

Technical Field

[0001] The utility model relates to a bipolar plate density measuring tool. Background Art

[0002] The metal bipolar plates of hydrogen-oxygen fuel cells play the role of transmitting fuel gas, oxidant and heat dissipation during operation, and include three conducting parts: hydrogen, air and cooling water. Among them, the cooling water conducting part is located in the middle of the air conducting part and the hydrogen conducting part. When in use, the sealing between the cooling water conducting part and the hydrogen and air conducting parts must be ensured, otherwise it will cause gas overflow. If hydrogen and air are mixed, there is a risk of combustion or even explosion. At the same time, any leakage in any of the three conducting parts of the bipolar plate: hydrogen, air and cooling water will directly affect the power generation efficiency, performance and safety of the stack. Therefore, it is extremely necessary to detect the sealing of the bipolar plate.

[0003] In the prior art, the tooling for testing the sealing of bipolar plates can only test one bipolar plate at a time, and the testing cost is high and the efficiency is low. As disclosed in the prior patent CN213779419U, a bipolar plate leak detection device is used to test the bipolar plates. In this patent, a first mold and a second mold are used to clamp the bipolar plates to form multiple chambers, and the air tightness of the bipolar plates is tested in combination with the air intake channel. However, each test can only be performed on one bipolar plate, and the testing efficiency is low. At present, the production yield of bipolar plates is relatively high. How to quickly detect bipolar plates with poor sealing is a technical problem that we need to solve. Utility Model Content

[0004] The present application proposes a multi-layer bipolar plate tightness testing tool, the purpose of which is to solve the problem that the existing tightness testing tool can only detect the air tightness of one bipolar plate at a time and has low detection efficiency.

[0005] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0006] A multi-layer bipolar plate density measuring tool, comprising: an upper cover plate, a middle cover plate, and a lower cover plate, wherein: a first bipolar plate fixing area is provided on the upper surface of the middle cover plate, and a second bipolar plate covering area is provided on the lower surface of the middle cover plate, and a circle of first sealing ring is respectively provided along the edge of the first bipolar plate fixing area and the edge of the second bipolar plate covering area; an oxygen channel, a hydrogen channel and a water channel are provided in the middle cover plate, and three joints corresponding to the ventilation of the oxygen channel, the hydrogen channel and the water channel are provided on the side of the middle cover plate; a first upper air outlet, a second upper air outlet and a third upper air outlet are respectively provided on the upper surface of the middle cover plate, which are communicated with the oxygen channel, the hydrogen channel and the water channel; a first upper air outlet, a second upper air outlet and a third upper air outlet are respectively provided on the lower surface of the middle cover plate, which are communicated with the oxygen channel, the hydrogen channel and the water channel The upper cover plate has a first lower air outlet, a second lower air outlet and a third lower air outlet connected thereto; the upper cover plate has a first bipolar plate covering area on its lower surface, and a second sealing ring is arranged along the first bipolar plate covering area; the lower cover plate has a second bipolar plate fixing area on its upper surface, and a third sealing ring is arranged along the second bipolar plate fixing area; the upper cover plate and the upper surface of the middle cover plate detect the first bipolar plate to be tested, and the lower surface of the middle cover plate and the lower cover plate detect the second bipolar plate to be tested; the first upper air outlet, the second upper air outlet and the third upper air outlet respectively correspond to the oxygen port, the hydrogen port and the coolant port of the first bipolar plate to be tested; the first lower air outlet, the second lower air outlet and the third lower air outlet respectively correspond to the oxygen port, the hydrogen port and the coolant port of the second bipolar plate to be tested.

[0007] Preferably, the three connectors are respectively connected to a corresponding air supply device, and an air tightness detection sensor is respectively provided at the front end of each connector.

[0008] Preferably, positioning pins are respectively provided on the upper surface of the lower cover plate and the upper surface of the middle cover plate, and positioning holes are respectively provided on the first bipolar plate to be tested and the second bipolar plate to be tested, and the positioning pins pass through the positioning holes.

[0009] Preferably, the three connectors are located on the same side or multiple sides of the middle cover plate.

[0010] Due to the adoption of the above technical solution, the multi-layer bipolar plate tightness testing tool of the present application can simultaneously detect the air tightness of two bipolar plates, thereby improving the efficiency of the initial screening test. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application;

[0012] Figure 2 for Figure 1 Perspective drawing. DETAILED DESCRIPTION

[0013] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0014] Combination Figure 1 As shown, the multi-layer bipolar plate density testing tool of this embodiment includes an upper cover plate 1, a middle cover plate 2 and a lower cover plate 3. A first test air cavity for testing a first bipolar plate to be tested is formed between the upper surface of the upper cover plate 1 and the middle cover plate 2, and a second test air cavity for testing a second bipolar plate to be tested is formed between the lower surface of the middle cover plate 2 and the lower cover plate 3.

[0015] Combination Figure 1 and Figure 2 As shown, a first bipolar plate fixing area 21 is provided on the upper surface of the middle cover plate 2, and a second bipolar plate covering area 22 is provided on the lower surface of the middle cover plate 2, and a circle of first sealing rings 23 are respectively provided along the edge of the first bipolar plate fixing area 21 and the edge of the second bipolar plate covering area 22. An oxygen channel 24, a hydrogen channel 25 and a water channel 26 are provided in the middle cover plate 2, and three joints 27 corresponding to the ventilation of the oxygen channel, the hydrogen channel and the water channel are provided on the side of the middle cover plate 2. The three joints 27 can be on the same side or multiple sides of the middle cover plate 2, and the position of the joint 27 is set to avoid other structures, such as preventing interference with positioning pins. The upper surface of the middle cover plate 2 is respectively provided with a first upper air outlet 28, a second upper air outlet 29, and a third upper air outlet 210 that are connected to the oxygen channel, the hydrogen channel and the water channel. The lower surface of the corresponding middle cover plate 2 is respectively provided with a first lower air outlet, a second lower air outlet and a third lower air outlet which are communicated with the oxygen channel, the hydrogen channel and the water channel.

[0016] like Figure 2 As shown, a first bipolar plate covering area 11 is provided on the lower surface of the upper cover plate 1, and a second sealing ring 12 is provided along the first bipolar plate covering area. The lower surface of the upper cover plate 1 is pressed together with the upper surface of the middle cover plate 2 to form a first test air cavity for testing the first bipolar plate to be tested. The first upper air outlet 28, the second upper air outlet 29, and the third upper air outlet 210 on the upper surface of the middle cover plate 2 correspond to the oxygen port, the hydrogen port, and the coolant port of the first bipolar plate to be tested, respectively.

[0017] A second bipolar plate fixing area 31 is provided on the upper surface of the lower cover plate 3, and a third sealing ring 32 is provided along the second bipolar plate fixing area 31. The upper surface of the lower cover plate 2 is pressed together with the lower surface of the middle cover plate 2 to form a second test air cavity for testing the second bipolar plate to be tested. The first lower air outlet, the second lower air outlet and the third lower air outlet on the lower surface of the middle cover plate 2 correspond to the oxygen port, the hydrogen port and the coolant port of the first bipolar plate to be tested, respectively.

[0018] During the test, the first bipolar plate to be tested and the second bipolar plate to be tested are placed in the corresponding test air chamber. The three joints are respectively connected to the corresponding air supply devices (different air sources and air inlet valves, etc.), and an airtightness detection sensor is respectively provided at the front end of each joint. Each passage is tested separately, and the airtightness of the two bipolar plates under test can be detected by the change of air pressure. When the airtightness detection sensor maintains a constant pressure, the bipolar plate under test is judged as a good product, otherwise it is judged as a defective product to be determined. In this way, the detection efficiency is increased through preliminary screening.

[0019] In order to further increase the stability of the bipolar plate and solve the positioning problem, positioning pins 4 are respectively provided on the upper surface of the lower cover plate and the upper surface of the middle cover plate, and positioning holes are respectively provided on the first bipolar plate to be tested and the second bipolar plate to be tested, and the positioning pins pass through the positioning holes.

[0020] In summary, the airtightness detection tooling of the present application has a simple structure, is suitable for mass production, and can improve detection efficiency.

[0021] The above-described embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Equivalent changes and modifications made to the present invention by those skilled in the art should all fall within the scope of the claims attached to the present invention.

Claims

1. A multi-layer bipolar plate density measuring tool, characterized in that: include: Upper cover, middle cover, lower cover, including: A first bipolar plate fixing area is provided on the upper surface of the middle cover plate, and a second bipolar plate covering area is provided on the lower surface of the middle cover plate, and a circle of first sealing ring is respectively provided along the edge of the first bipolar plate fixing area and the edge of the second bipolar plate covering area; an oxygen channel, a hydrogen channel and a water channel are provided in the middle cover plate, and three joints corresponding to the ventilation of the oxygen channel, the hydrogen channel and the water channel are provided on the side of the middle cover plate; a first upper air outlet, a second upper air outlet and a third upper air outlet are respectively provided on the upper surface of the middle cover plate, which are communicated with the oxygen channel, the hydrogen channel and the water channel; a first lower air outlet, a second lower air outlet and a third lower air outlet are respectively provided on the lower surface of the middle cover plate, which are communicated with the oxygen channel, the hydrogen channel and the water channel; The upper cover plate has a first bipolar plate covering area on its lower surface, and a second sealing ring is arranged along the first bipolar plate covering area; The lower cover plate has a second bipolar plate fixing area on its upper surface, and a third sealing ring is arranged along the second bipolar plate fixing area; The upper surface of the upper cover plate and the middle cover plate detects the first bipolar plate to be tested, and the lower surface of the middle cover plate and the lower cover plate detect the second bipolar plate to be tested; the first upper air outlet, the second upper air outlet, and the third upper air outlet respectively correspond to the oxygen port, the hydrogen port, and the coolant port of the first bipolar plate to be tested; the first lower air outlet, the second lower air outlet, and the third lower air outlet respectively correspond to the oxygen port, the hydrogen port, and the coolant port of the second bipolar plate to be tested.

2. The multi-layer bipolar plate density measuring tool according to claim 1, characterized in that: The three joints are respectively connected to a gas supply device, and an airtight detection sensor is respectively arranged at the front end of each joint.

3. The multi-layer bipolar plate density measuring tool according to claim 1, characterized in that: Positioning pins are respectively provided on the upper surface of the lower cover plate and the upper surface of the middle cover plate, and positioning holes are respectively provided on the first bipolar plate to be tested and the second bipolar plate to be tested, and the positioning pins pass through the positioning holes.

4. The multi-layer bipolar plate density measuring tool according to claim 1, characterized in that: The three joints are located on the same side or multiple sides of the middle cover plate.

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