Bipolar plate air leakage position detection device and detection method

Abstract

The invention relates to a bipolar plate air leakage position detection device and method, the bipolar plate air leakage position detection device comprises a first plate, a second plate and an auxiliary member, the first plate is provided with a first transparent observation area, and the first plate is provided with a plurality of liquid inlets corresponding to a plurality of liquid inlets of a bipolar plate one by one; the second plate is provided with a second transparent observation area, and the auxiliary part is arranged on the first plate and / or the second plate; according to the bipolar plate gas leakage position detection device and detection method, the bipolar plate can be fastened and clamped through the first plate and the second plate, and the colored liquid and the gas with a certain pressure are injected into the inlet of the bipolar plate and the liquid flow channel in the bipolar plate through the liquid inlet in the first plate so as to judge whether the gas leakage problem exists in the liquid flow channel; when colored liquid overflows through an air leakage position under air pressure, a detector can visually find out the specific position of air leakage through the first transparent observation area and the second transparent observation area.

Description

Technical Field

[0001] The present application relates to the field of fuel cell detection technology, and in particular to a bipolar plate leakage position detection device and detection method. Background Art

[0002] Bipolar plates are one of the indispensable core components of fuel cells. Their performance directly affects the overall performance and service life of fuel cells. Bipolar plates need to be tested for air tightness after production to ensure their quality.

[0003] Currently, when testing bipolar plates with airtight testing equipment, the bipolar plates are mostly placed in a fixture of the airtight testing equipment, and gas is filled into the three cavities of the bipolar plates to determine whether the bipolar plates are leaking based on the amount of gas leakage.

[0004] However, the existing airtightness detection equipment can only determine whether the bipolar plate is leaking, but cannot know the cause and specific location of the leakage, which makes it inconvenient for the manufacturer to improve the processing link that causes the leakage. Therefore, there is an urgent need for a method that can detect the location of the bipolar plate leakage to find the location and cause of the bipolar plate leakage. Summary of the invention

[0005] Based on this, it is necessary to provide a bipolar plate leakage position detection device and a detection method to address the problem that the above-mentioned airtightness detection equipment cannot determine the leakage cause and leakage position of the bipolar plate.

[0006] According to one aspect of the present application, a bipolar plate leakage position detection device is provided, comprising:

[0007] A first plate member having a first transparent observation area, wherein a plurality of liquid inlets are provided on the first plate member, and the plurality of liquid inlets are arranged in one-to-one correspondence with the plurality of liquid inlets of the bipolar plate;

[0008] a second plate having a second transparent observation area;

[0009] an auxiliary member, disposed on the first plate and / or the second plate, the auxiliary member being used to connect the first plate and the second plate and capable of adjusting the distance between the first plate and the second plate so that the bipolar plate can be fastened between the first plate and the second plate;

[0010] Wherein, the first transparent observation area and the second transparent observation area are used to observe the fastened bipolar plate.

[0011] In one embodiment, the first plate and / or the second plate is a transparent plate.

[0012] In one of the embodiments, a plurality of liquid outlets are further provided on the first plate, and the plurality of liquid outlets are arranged in one-to-one correspondence with the plurality of liquid outlets of the bipolar plate, and a plug is provided on at least one of the liquid outlets.

[0013] In one of the embodiments, the plug is detachably disposed on the liquid outlet.

[0014] In one embodiment, the inner diameter of the liquid inlet is consistent with the inner diameter of the liquid outlet.

[0015] In one embodiment, the auxiliary component is detachably disposed on the first plate component and the second plate component.

[0016] According to another aspect of the present application, a method for detecting a leakage position of a bipolar plate is provided, which is used in the bipolar plate leakage position detection device described in any one of the above embodiments, comprising:

[0017] Fastening and sealing the bipolar plate between the first plate and the second plate;

[0018] Passing a colored liquid into at least one inlet of the bipolar plate;

[0019] After the colored liquid flows into the liquid flow channel connected to the inlet, gas is introduced into the inlet;

[0020] Observe the flow of the colored liquid, and determine whether there is a leakage problem in the liquid flow channel and the location of the leakage that causes the leakage problem.

[0021] In one embodiment, fastening and sealing the bipolar plate between the first plate and the second plate includes:

[0022] placing the bipolar plate between the first plate and the second plate;

[0023] adjusting the distance between the first plate and the second plate by using an auxiliary member, and making the first seal on the bipolar plate abut against the first plate, and making the second seal on the bipolar plate abut against the second plate;

[0024] The first sealing member is located on the side of the bipolar plate facing the first plate, and the second sealing member is located on the side of the bipolar plate facing the second plate.

[0025] In one embodiment, after the colored liquid flows into the liquid flow channel connected to the inlet, introducing gas into the inlet comprises:

[0026] Observing the flow direction of the colored liquid through the first transparent observation area on the first plate and / or the second transparent observation area on the second plate;

[0027] After the colored liquid fills part or all of the liquid flow channel, a gas with a pressure range of 10 kPa-350 kPa is introduced into the inlet.

[0028] In one embodiment, the pH value of the colored liquid is greater than or equal to 6 and less than or equal to 8.

[0029] The above-mentioned bipolar plate leakage position detection device and detection method can fasten and clamp the bipolar plate through the first plate and the second plate, and ensure the fastening effect through auxiliary parts, so that the bipolar plate can be sealed between the first plate and the second plate, and at the same time, a colored liquid and a certain pressure of gas can be injected into the inlet of the bipolar plate and the internal liquid flow channel through the liquid inlet on the first plate to determine whether there is a leakage problem in the liquid flow channel, so that when the bipolar plate has a leakage position that cannot be observed by the naked eye during the production links such as stamping, welding, and bonding, the colored liquid can overflow through the leakage position under the push of gas pressure, so that the detection personnel can intuitively find the specific position of the leakage through the first transparent observation area and the second transparent observation area, and then find the processing link where the leakage position is generated according to the law of the leakage position, so as to subsequently improve the processing link that generates the leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a schematic diagram of the structure of a bipolar plate leakage position detection device according to some embodiments of the present application.

[0031] FIG. 2 is a schematic diagram of the structure between the first plate member, the second plate member and the bipolar plate of a bipolar plate leakage position detection device in some embodiments of the present application.

[0032] FIG. 3 is a schematic diagram of the structural disassembly of a bipolar plate leakage position detection device according to some embodiments of the present application.

[0033] FIG. 4 is a schematic diagram of the structural disassembly of the bipolar plate leakage position detection device according to some embodiments of the present application from another perspective.

[0034] Reference numerals:

[0035] 1. first plate; 11. liquid inlet; 12. liquid outlet;

[0036] 2. The second plate;

[0037] 3. Auxiliary part; 31. First fastening assembly; 32. Second fastening assembly; 33. First fastening member; 34. Second fastening member;

[0038] 4. Bipolar plate; 41. First sealing member; 42. Liquid inlet; 43. Liquid outlet. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0045] Bipolar plates, also known as current collectors in the industry, are one of the indispensable core components of fuel cells. They play a vital role in fuel cell systems and have a variety of functions. They not only separate fuel and oxidant, but also collect and transmit current, evenly distribute gas, dissipate heat, and maintain a uniform temperature field in the battery. In the working process of fuel cells, bipolar plates play a vital role, and their performance directly affects the overall performance and service life of fuel cells. In the field of fuel cells, the design and manufacturing process of bipolar plates need to follow strict industry standards and technical specifications. In order to ensure the stable operation and efficient performance of bipolar plates in fuel cell systems, comprehensive optimization is required in terms of material selection, processing technology, structural design, etc. For example, in terms of processing technology, advanced manufacturing technology and equipment are needed to ensure the processing accuracy and surface quality of bipolar plates.

[0046] In the prior art, airtightness testing equipment is generally used to test the airtightness of metal bipolar plates. The specific testing method of the airtightness testing equipment is: the metal bipolar plate is placed in a fixture, and gas is filled into the three cavities after being compressed by a cylinder, and whether there is a leak is determined by the amount of gas leakage. However, the leakage of metal bipolar plates includes many complex situations such as leakage between the hydrogen cavity and the air cavity, leakage between the hydrogen cavity and the water cavity, and leakage between the air cavity and the water cavity. The airtightness testing equipment can only simply determine whether there is a leak in the metal bipolar plate, and the cause and location of the leak cannot be known.

[0047] Therefore, there is an urgent need for a method that can detect the location of bipolar plate leakage, so as to accurately detect the location and cause of bipolar plate leakage, so as to subsequently improve the processing links that cause leakage.

[0048] Referring to Figures 1 and 2, an embodiment of the present application provides a bipolar plate leakage position detection device, including a first plate 1, a second plate 2 and an auxiliary member 3. Among them, the second plate 2 is spaced apart from the first plate 1, and is used to clamp the bipolar plate 4 to be detected. The auxiliary member 3 is arranged on the first plate 1 and / or the second plate 2, and is used to adjust the spacing between the first plate 1 and the second plate 2, so that the bipolar plate 4 can be fastened between the first plate 1 and the second plate 2. The material of the bipolar plate 4 can be stainless steel, titanium, titanium alloy, magnesium alloy, aluminum, nickel, copper.

[0049] Referring to FIG. 3 and FIG. 4, in the specific configuration, the bipolar plate 4 has a first seal 41 and a second seal on two opposite sides, respectively. When the first plate 1 and the second plate 2 clamp the bipolar plate 4, the first seal 41 and the second seal can naturally come into close contact with the first plate 1 and the second plate 2, so that the bipolar plate 4 can be sealed between the first plate body and the second plate body, so that the air inside the bipolar plate 4 will not leak from all sides. In the embodiment of the present application, the thickness of the first seal 41 and the second seal is 0.6 mm, and the thickness of the second plate 2 and the first plate 1 is 50 mm.

[0050] The first plate 1 is provided with a plurality of liquid inlets 11 corresponding one to one with the plurality of liquid inlets 42 of the bipolar plate 4. The inspector can inject a colored liquid and a gas of a certain pressure into the inlet of the bipolar plate 4 and the internal liquid flow channel thereof through the liquid inlet 11. The colored liquid, driven by the gas pressure, can overflow through the leaking position when a leaking position that cannot be observed by the naked eye occurs in the bipolar plate 4 during the production process such as stamping, welding, and bonding, so that the inspector can intuitively find the specific position of the leak.

[0051] Specifically, the bipolar plate 4 has a water inlet, a water outlet, a fuel inlet, a fuel outlet, an oxidant inlet and an oxidant outlet, and a water flow channel connecting the water inlet and the water outlet, a fuel flow channel connecting the fuel inlet and the fuel outlet, and an oxidant flow channel connecting the oxidant inlet and the oxidant outlet. The first plate 1 is provided with three liquid inlets 11, and the three liquid inlets 11 are respectively arranged in one-to-one correspondence with the water inlet, the fuel inlet and the oxidant inlet. The colored liquid can enter the water inlet, the fuel inlet and the oxidant inlet through the three liquid inlets 11, and be injected into the water flow channel, the fuel flow channel and the oxidant flow channel.

[0052] The first plate 1 is provided with a first transparent observation area for observing the bipolar plate 4. The inspector can observe the flow direction of the colored liquid through the first transparent observation area to determine whether there is a leakage problem in the liquid flow channel, and intuitively find the specific location of the leakage when there is a leakage problem. To ensure the observation effect, the orthographic projection area of ​​the first transparent observation area on the second plate 2 is greater than or equal to the orthographic projection area of ​​the bipolar plate 4 on the second plate 2.

[0053] A second transparent observation area for observing the bipolar plate 4 is provided on the second plate 2. The inspector can observe the flow direction of the colored liquid through the second transparent observation area to determine whether there is a leakage problem in the liquid flow channel, and intuitively find the specific location of the leakage when there is a leakage problem. To ensure the observation effect, the orthographic projection area of ​​the second transparent observation area on the first plate 1 is greater than or equal to the orthographic projection area of ​​the bipolar plate 4 on the first plate 1.

[0054] In summary, the bipolar plate leakage position detection device of the present application can fasten and clamp the bipolar plate 4 through the first plate 1 and the second plate 2, and ensure the fastening effect through the auxiliary part 3, so that the bipolar plate 4 can be sealed between the first plate 1 and the second plate 2, and at the same time, a colored liquid and a certain pressure of gas can be injected into the inlet of the bipolar plate 4 and its internal liquid flow channel through the liquid inlet 11 on the first plate 1 to determine whether there is a leakage problem in the liquid flow channel, so that when the bipolar plate 4 has a leakage position that cannot be observed by the naked eye due to stamping, welding, bonding and other production links, the colored liquid can overflow through the leakage position under the push of air pressure, so that the detection personnel can intuitively find the specific position of the leakage through the first transparent observation area and the second transparent observation area, and then find the processing link that produces the leakage position according to the law of the leakage position, so as to improve the processing link that produces the leakage later. The operation method of the bipolar plate leakage position detection device of the present application is simple, which is conducive to reducing the cost in the production process, and the detection of the metal bipolar plate 4 can be completed without the use of expensive and complex equipment.

[0055] Referring to Figures 1 and 2, in one embodiment, the first plate 1 and / or the second plate 2 are both transparent plates, so that the inspection personnel can observe the flow direction of the colored liquid through the fully transparent first plate 1 and / or the second plate 2, determine whether there is a leakage problem in the liquid flow path, and intuitively find the specific location of the leakage when there is a leakage problem.

[0056] Specifically, the first plate 1 and the second plate 2 are both transparent plates. Compared with the first plate 1 with the first transparent observation area and the second plate 2 with the second transparent observation area, the first plate 1 and the second plate 2 which are fully transparent are more convenient for observing the condition of the bipolar plate 4.

[0057] More specifically, the first plate 1 and the second plate 2 are made of polymethyl methacrylate, polycarbonate, glass fiber reinforced polypropylene, glass, transparent ABS or transparent nylon. Among them, polymethyl methacrylate is a material with the advantages of high transparency, low price, easy machining, etc., and is often used as a substitute for glass. Its density is about 1.15-1.19g / cm³, which is half of glass, and its mechanical strength is high. Its tensile and impact resistance are 7-18 times higher than that of ordinary glass. Polycarbonate is an amorphous engineering material with particularly good impact strength, thermal stability, gloss, antibacterial properties, flame retardant properties and anti-pollution properties. Glass fiber reinforced polypropylene is a composite material that combines the excellent properties of polypropylene resin with the strength and heat resistance of glass fiber. Transparent ABS is a plastic material that combines the toughness and transparency of ABS plastic.

[0058] Glass is an amorphous inorganic non-metallic material, usually made of a variety of inorganic minerals as the main raw materials. The molecular arrangement of glass is irregular and isotropic. It has no fixed melting point. The transformation from solid to liquid occurs within a certain temperature range. It is metastable and contains higher internal energy than crystalline substances.

[0059] Transparent nylon is an amorphous or non-crystalline thermoplastic nylon with better light transmittance than PC and glass, which can meet the most demanding optical applications. Transparent nylon has excellent bending fatigue strength and extremely high chemical resistance, suitable for applications under dynamic load conditions, and is not prone to stress cracking when in contact with the medium.

[0060] Referring to FIG. 3 and FIG. 4 , in one embodiment, the first plate 1 is further provided with a plurality of liquid outlets 12 corresponding to the plurality of liquid outlets 43 of the bipolar plate 4, and at least one of the liquid outlets 12 is provided with a plug. The plug can block the liquid outlet 12 on the liquid flow path to be tested for testing.

[0061] Specifically, the bipolar plate 4 has a water inlet, a water outlet, a fuel inlet, a fuel outlet, an oxidant inlet and an oxidant outlet, and a water flow channel connecting the water inlet and the water outlet, a fuel flow channel connecting the fuel inlet and the fuel outlet, and an oxidant flow channel connecting the oxidant inlet and the oxidant outlet. The first plate 1 is provided with three liquid outlets 12, and the three liquid outlets 12 are respectively arranged in one-to-one correspondence with the water outlet, the fuel outlet and the oxidant outlet.

[0062] When one of the water flow channel, the fuel flow channel and the oxidant flow channel needs to be inspected, a plug can be provided only on the liquid outlet 12 corresponding to the outlet of the flow channel. When the water flow channel, the fuel flow channel and the oxidant flow channel need to be inspected at the same time, plugs can be provided on all three liquid outlets 12.

[0063] In one embodiment, the plug is detachably disposed on the liquid outlet 12 so as to be replaced as required. Specifically, the plug is threadably connected to the liquid outlet 12 to ensure the plug has a blocking effect on the liquid outlet 12.

[0064] More specifically, the inner diameter of the liquid inlet 11 is consistent with the inner diameter of the liquid outlet 12, so that the positions of the liquid inlet 11 and the liquid outlet 12 can be replaced during the detection process, and there is no need to deliberately find the positions of the liquid inlet 11 and the liquid outlet 12, which is convenient for the detection operation. That is, it can be understood that in the specific test process, the liquid inlet 11 can be used as a port for injecting colored liquid, and the liquid outlet 12 can also be used as a port for colored liquid.

[0065] Exemplarily, when the liquid inlet 11 is used as a port for injecting colored liquid, the plug is sealed on the liquid outlet 12, and then the colored liquid is injected into the liquid inlet 42 of the bipolar plate 4 and the corresponding liquid flow channel through the liquid inlet 11, and a certain pressure of gas is introduced to determine whether there is a leakage problem in the liquid flow channel. When the liquid outlet 12 is used as a port for injecting colored liquid, the plug is sealed on the liquid inlet 11, and then the colored liquid is injected into the liquid outlet 43 of the bipolar plate 4 and the corresponding liquid flow channel through the liquid outlet 12, and a certain pressure of gas is introduced to determine whether there is a leakage problem in the liquid flow channel. In summary, this structure does not need to deliberately find the positions of the liquid inlet 11 and the liquid outlet 12, which is convenient for detection operations.

[0066] Referring to Fig. 1, Fig. 3 and Fig. 4, in one embodiment, the auxiliary component 3 is detachably arranged on the first plate 1 and the second plate 2. Specifically, the auxiliary component 3 includes a first fastening component 31 and a second fastening component 32, and the first fastening component 31 and the second fastening component 32 are arranged at intervals along the short side direction of the first plate 1. The first fastening component 31 includes a plurality of first fasteners 33, and the plurality of first fasteners 33 are arranged at intervals along the long side direction of the first plate 1. The second fastening component 32 includes a plurality of second fasteners 34, and the plurality of second fasteners 34 are arranged at intervals along the long side direction of the second plate 2. The first plate 1 and the second plate 2 are fastened and connected by the cooperation of the plurality of first fasteners 33 and the plurality of second fasteners 34.

[0067] More specifically, referring to Figures 3 and 4, the first fastener 33 and the second fastener 34 each include a bolt, a first nut and a second nut, the bolt is passed through the first plate 1 and the second plate 2, the first nut and the second nut are respectively screwed on the bolt twice, and respectively abut against the first plate 1 and the second plate 2. This structure can fasten the first plate 1 and the second plate 2 without using complex equipment such as cylinders and motors, the overall structure is simple, and the detection of the metal bipolar plate 4 can be completed without using expensive and complex equipment, which is conducive to reducing the cost in the production process.

[0068] The embodiment of the present application further provides a method for detecting a leakage position of a bipolar plate, which is used in a device for detecting a leakage position of a bipolar plate in any one of the above embodiments, comprising:

[0069] The bipolar plate 4 is fastened and sealed between the first plate 1 and the second plate 2 .

[0070] Specifically, the bipolar plate 4 is placed between the first plate 1 and the second plate 2 .

[0071] The distance between the first plate 1 and the second plate 2 is adjusted by the auxiliary member 3 , and the first seal 41 on the bipolar plate 4 is abutted against the first plate 1 , and the second seal on the bipolar plate 4 is abutted against the second plate 2 .

[0072] The first sealing member 41 is located on the side of the bipolar plate 4 facing the first plate 1 , and the second sealing member is located on the side of the bipolar plate 4 facing the second plate 2 .

[0073] A colored liquid is introduced into at least one inlet of the bipolar plate 4 .

[0074] Specifically, the bipolar plate 4 has a water inlet, a water outlet, a fuel inlet, a fuel outlet, an oxidant inlet and an oxidant outlet, as well as a water flow channel connecting the water inlet and the water outlet, a fuel flow channel connecting the fuel inlet and the fuel outlet, and an oxidant flow channel connecting the oxidant inlet and the oxidant outlet.

[0075] The first plate 1 is provided with three liquid inlets 11, and the three liquid inlets 11 are respectively arranged in one-to-one correspondence with the water inlet, the fuel inlet and the oxidant inlet, and the colored liquid can enter the water inlet, the fuel inlet and the oxidant inlet through the three liquid inlets 11, and be injected into the water flow channel, the fuel flow channel and the oxidant flow channel. In addition, in the embodiment of the present application, the colored liquid can also enter the inlet located in the middle of the bipolar plate 4 (the inlet is one of the water inlet, the fuel inlet or the oxidant inlet) through the liquid inlet 11 located in the middle of the first plate 1 for detection.

[0076] When it is necessary to inspect one of the water flow channel, the fuel flow channel and the oxidant flow channel, a plug can be provided on the liquid outlet 12 corresponding to the outlet of the flow channel, and then a colored liquid can be injected into the liquid inlet 42 corresponding to the flow channel. When it is necessary to inspect the water flow channel, the fuel flow channel and the oxidant flow channel at the same time, plugs can be provided on all three liquid outlets 12, and then colored liquid can be injected into the water inlet, the fuel inlet and the oxidant inlet through the three liquid inlets 11, respectively, so that the colored liquid flows into the water flow channel, the fuel flow channel and the oxidant flow channel.

[0077] After the colored liquid flows into the liquid flow channel connected with the inlet, gas is introduced into the inlet.

[0078] Specifically, the flow direction of the colored liquid is observed through the first transparent observation area on the first plate 1 and / or the second transparent observation area on the second plate 2. After the colored liquid fills part or all of the liquid flow channel, a gas with a pressure range of 10kpa-350kpa is introduced into the inlet for 5s-60s. More specifically, the pressure of the introduced gas is 50kpa.

[0079] It can be understood that the gas introduced above can be compressed air, nitrogen, argon or helium.

[0080] Observe the flow of colored liquid and determine whether there is a leakage problem in the liquid flow channel and the leakage location that causes the leakage problem. That is, the colored liquid can overflow through the leakage location that cannot be observed by the naked eye due to the production process such as stamping, welding, and bonding under the push of air pressure. The inspection personnel can intuitively find the specific location of the leakage according to the flow direction of the colored liquid through the first transparent observation area and the second transparent observation area.

[0081] In one embodiment, the pH value of the colored liquid is greater than or equal to 6 and less than or equal to 8. Solutions with a pH value between 6 and 8 are generally considered mild and will not cause corrosion damage to the metal bipolar plate 4, which is conducive to cleaning the metal bipolar plate 4 after the detection is completed.

[0082] As can be understood, pH is a numerical value indicating the acidity or alkalinity of a solution, which is defined as the negative logarithm of the hydrogen ion concentration, and the pH value generally ranges from 0 to 14, where a pH value of 7 is considered neutral, a pH value greater than 7 indicates that the solution is alkaline, and a pH value less than 7 indicates that the solution is acidic. When the pH value is greater than or equal to 6 and less than or equal to 8, the solution is considered to be close to neutral or slightly alkaline, and this range is generally considered to be suitable for many biological systems and industrial processes.

[0083] The detection method of the bipolar plate leakage position of the present application can fasten and clamp the bipolar plate 4 through the first plate 1 and the second plate 2 of the bipolar plate leakage position detection device, and ensure the fastening effect through the auxiliary part 3, so that the bipolar plate 4 can be sealed between the first plate 1 and the second plate 2, and at the same time, a colored liquid and a certain pressure of gas can be injected into the inlet of the bipolar plate 4 and its internal liquid flow channel through the liquid inlet 11 on the first plate 1 to determine whether there is a leakage problem in the liquid flow channel, so that when the bipolar plate 4 has a leakage position that cannot be observed by the naked eye due to stamping, welding, bonding and other production links, the colored liquid can overflow through the leakage position under the push of air pressure, so that the detection personnel can intuitively find the specific position of the leakage through the first transparent observation area and the second transparent observation area, and then find the processing link that produces the leakage position according to the law of the leakage position, so as to improve the processing link that produces the leakage later. The detection method of the bipolar plate leakage position of the present application is simple to operate, which is conducive to reducing the cost in the production process, and does not require the use of expensive and complex equipment to complete the detection of the metal bipolar plate 4.

[0084] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A bipolar plate leakage position detection device, characterized in that: include: A first plate member having a first transparent observation area, wherein a plurality of liquid inlets are provided on the first plate member, and the plurality of liquid inlets are arranged in one-to-one correspondence with the plurality of liquid inlets of the bipolar plate; a second plate having a second transparent observation area; an auxiliary member, disposed on the first plate and / or the second plate, the auxiliary member being used to connect the first plate and the second plate and capable of adjusting the distance between the first plate and the second plate so that the bipolar plate can be fastened between the first plate and the second plate; Wherein, the first transparent observation area and the second transparent observation area are used to observe the fastened bipolar plate.

2. The bipolar plate leakage position detection device according to claim 1, characterized in that: The first plate component and / or the second plate component is a transparent plate.

3. The bipolar plate leakage position detection device according to claim 1, characterized in that: The first plate is also provided with a plurality of liquid outlets, which are arranged in one-to-one correspondence with the plurality of liquid outlets of the bipolar plate, and at least one of the liquid outlets is provided with a plug.

4. The bipolar plate leakage position detection device according to claim 3, characterized in that: The plug is detachably arranged on the liquid outlet.

5. The bipolar plate leakage position detection device according to claim 3, characterized in that: The inner diameter of the liquid inlet is consistent with the inner diameter of the liquid outlet.

6. The bipolar plate leakage position detection device according to claim 1, characterized in that: The auxiliary member is detachably disposed on the first plate member and the second plate member.

7. A method for detecting a bipolar plate leakage position, characterized in that: The bipolar plate leakage position detection device according to any one of claims 1 to 6 comprises: Fastening and sealing the bipolar plate between the first plate and the second plate; Passing a colored liquid into at least one inlet of the bipolar plate; After the colored liquid flows into the liquid flow channel connected to the inlet, gas is introduced into the inlet; Observe the flow of the colored liquid, determine whether there is a leakage problem in the liquid flow channel, and determine the leakage position causing the leakage problem.

8. The method for detecting the leakage position of a bipolar plate according to claim 7, characterized in that: The method of fastening and sealing the bipolar plate between the first plate and the second plate comprises: placing the bipolar plate between the first plate and the second plate; adjusting the distance between the first plate and the second plate by using an auxiliary member, and making the first seal on the bipolar plate abut against the first plate, and making the second seal on the bipolar plate abut against the second plate; The first sealing member is located on the side of the bipolar plate facing the first plate, and the second sealing member is located on the side of the bipolar plate facing the second plate.

9. The method for detecting the leakage position of a bipolar plate according to claim 7, characterized in that: After the colored liquid flows into the liquid flow channel connected to the inlet, introducing gas into the inlet comprises: Observing the flow direction of the colored liquid through the first transparent observation area on the first plate and / or the second transparent observation area on the second plate; After the colored liquid fills part or all of the liquid flow channel, a gas with a pressure range of 10 kPa-350 kPa is introduced into the inlet.

10. The method for detecting the leakage position of a bipolar plate according to claim 7, characterized in that: The pH value of the colored liquid is greater than or equal to 6 and less than or equal to 8.

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