Bipolar plate air leakage position detection device

Abstract

The utility model 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 technical field of fuel cell detection, in particular to a bipolar plate gas leakage position detection device and method. BACKGROUND

[0002] The bipolar plate is one of the indispensable core components of a fuel cell, and its performance directly affects the overall performance and service life of the fuel cell. After production, the bipolar plate needs to be tested for air tightness to ensure its quality.

[0003] Currently, when detecting the bipolar plate by using an air tightness detection device, the bipolar plate is usually placed in the clamp of the air tightness detection device, and gas is filled into the three cavities of the bipolar plate, and whether the bipolar plate leaks is determined by the amount of gas leakage.

[0004] However, the existing air tightness detection device can only determine whether the bipolar plate leaks, but cannot determine the leakage reason and specific leakage position of the bipolar plate, so it is inconvenient for the production party to improve the processing link causing the leakage. Therefore, there is an urgent need for a method capable of detecting the leakage position of the bipolar plate to find the leakage position and reason of the bipolar plate. Invention content

[0005] Therefore, it is necessary to provide a bipolar plate gas leakage position detection device and method to solve the problem that the air tightness detection device cannot determine the leakage reason and position of the bipolar plate.

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

[0007] A first plate member has a first transparent observation area, and a plurality of liquid inlets are arranged on the first plate member, and the plurality of liquid inlets are arranged one-to-one corresponding to a plurality of liquid inlets of the bipolar plate;

[0008] A second plate member has a second transparent observation area;

[0009] An auxiliary member is arranged on the first plate member and / or the second plate member, and the auxiliary member is used to connect the first plate member and the second plate member, and can adjust the distance between the first plate member and the second plate member, so that the bipolar plate can be tightly fastened between the first plate member and the second plate member;

[0010] 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 member and / or the second plate member is a transparent plate.

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

[0013] In one of the embodiments, the plug is arranged on the liquid outlet in a detachable manner.

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

[0015] In one of the embodiments, the auxiliary member is arranged on the first plate member and the second plate member in a detachable manner.

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

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

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

[0019] after the colored liquid flows into the liquid flow channel communicated with the inlet, introducing a gas into the inlet;

[0020] observing the flow of the colored liquid, and determining whether the liquid flow channel has a leakage problem and the leakage position causing the leakage problem.

[0021] In one of the embodiments, the step of fastening and sealing the bipolar plate between the first plate member and the second plate member comprises:

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

[0023] adjusting the distance between the first plate member and the second plate member by the auxiliary member, and abutting the first sealing member on the bipolar plate against the first plate member, and abutting the second sealing member on the bipolar plate against the second plate member;

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

[0025] In one of the embodiments, the step of introducing a gas into the inlet after the colored liquid flows into the liquid flow channel communicated with the inlet comprises:

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

[0027] After the colored liquid fills part or all of the liquid flow channel, a gas with a pressure ranging from 10 kpa to 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 bipolar plate gas leakage position detection device and detection method can fasten and clamp the bipolar plate through the first plate member and the second plate member, ensure the fastening effect through the auxiliary member, seal the bipolar plate between the first plate member and the second plate member, inject the colored liquid and the gas with a certain pressure into the inlet and the internal liquid flow channel of the bipolar plate through the liquid inlet on the first plate member, and determine whether the liquid flow channel has a gas leakage problem. When the bipolar plate has a gas leakage position that cannot be observed by the naked eye during the production process such as stamping, welding, and bonding, the colored liquid can overflow through the gas leakage position under the pressure of the gas, so that the detection personnel can directly find the specific position of the gas leakage through the first transparent observation area and the second transparent observation area, find the processing link that causes the gas leakage position according to the rule of the gas leakage position, and improve the processing link that causes the gas leakage in the subsequent process. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Structure diagram of the bipolar plate gas leakage position detection device of some embodiments of the present application.

[0031] Figure 2 Structure diagram of the first plate member, the second plate member, and the bipolar plate of the bipolar plate gas leakage position detection device of some embodiments of the present application.

[0032] Figure 3 Structure diagram of the bipolar plate gas leakage position detection device of some embodiments of the present application.

[0033] Figure 4 Structure diagram of the bipolar plate gas leakage position detection device of some embodiments of the present application from another perspective.

[0034] Reference signs:

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

[0036] 2, second plate member;

[0037] 3, auxiliary member; 31, first fastening assembly; 32, second fastening assembly; 33, first fastening member; 34, second fastening member;

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

[0039] In order to make the above objectives, features and advantages of the present application more clear and easily understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways from those described herein without departing from the scope of the present application, and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0042] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0044] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0045] Bipolar plates, also known as current collector plates in the industry, are one of the indispensable core components of fuel cells. They play a crucial role in fuel cell systems, with diverse functions, including separating fuel and oxidant, collecting and transmitting electric current, uniformly distributing gas, dissipating heat, and maintaining uniform temperature fields. During the operation of fuel cells, bipolar plates play a crucial 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. To ensure stable operation and high performance of bipolar plates in fuel cell systems, comprehensive optimization is needed in terms of material selection, processing technology, and structural design. For example, in terms of processing technology, advanced manufacturing techniques and equipment are needed to ensure the processing precision and surface quality of bipolar plates.

[0046] In the prior art, metal bipolar plates are generally tested for air tightness by air tightness testing equipment. The specific detection method of the air tightness testing equipment is: the metal bipolar plate is placed in a clamp, and after being pressed by a gas cylinder, gas is filled into three cavities, and whether it leaks is judged by the amount of gas leakage. However, the metal bipolar plate has multiple complex leakage conditions such as hydrogen cavity and air cavity leakage, hydrogen cavity and water cavity leakage, air cavity and water cavity leakage, etc., and the air tightness testing equipment can only simply judge whether the metal bipolar plate has a leakage condition, and cannot know the cause and location of the leakage.

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

[0048] Referring to Figure 1 and Figure 2 , an embodiment of the present application provides a bipolar plate air leakage location detection device, which comprises a first plate 1, a second plate 2 and an auxiliary part 3. The second plate 2 is arranged in a spaced manner with the first plate 1, and is used to clamp the bipolar plate 4 to be detected. The auxiliary part 3 is arranged on the first plate 1 and / or the second plate 2, and is used to adjust the distance between the first plate 1 and the second plate 2, so that the bipolar plate 4 can be tightly 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 Figure 3 and Figure 4 , when the first plate 1 and the second plate 2 clamp the bipolar plate 4, the first sealing part 41 and the second sealing part can naturally make 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, and the air inside the bipolar plate 4 cannot leak from the surroundings. In the embodiment of the present application, the thickness of the first sealing part 41 and the second sealing part is 0.6mm, and the thickness of the first plate 1 and the second plate 2 is 50mm.

[0050] The first plate 1 is provided with a plurality of liquid inlets 11 corresponding to a plurality of liquid inlets 42 of the bipolar plate 4. The detection personnel can inject colored liquid and gas with a certain pressure into the inlets of the bipolar plate 4 and the liquid flow channel inside the bipolar plate 4 through the liquid inlets 11. The colored liquid can overflow through the air leakage position when the air leakage position cannot be observed by the naked eye due to the production links such as stamping, welding and bonding, so as to facilitate the detection personnel to find the specific position of the air leakage.

[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, 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. The first plate 1 is provided with three liquid inlets 11, and the three liquid inlets 11 are 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. An inspector can observe the flow direction of the colored liquid through the first transparent observation area to determine whether there is a gas leakage problem in the liquid flow channel and directly find the specific location of the gas leakage when there is a gas 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] The second plate 2 is provided with a second transparent observation area for observing the bipolar plate 4. An inspector can observe the flow direction of the colored liquid through the second transparent observation area to determine whether there is a gas leakage problem in the liquid flow channel and directly find the specific location of the gas leakage when there is a gas 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 gas leakage position detection device 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 member 3, so that the bipolar plate 4 can be sealed between the first plate 1 and the second plate 2. At the same time, the first plate 1 can be used to inject the colored liquid and the gas with a certain pressure into the inlet of the bipolar plate 4 and the liquid flow channel inside the bipolar plate 4 to determine whether there is a gas leakage problem in the liquid flow channel. When the bipolar plate 4 has a gas leakage position that cannot be observed by the naked eye in the production process such as stamping, welding, and bonding, the colored liquid can overflow through the gas leakage position under the pressure of the gas, so that an inspector can directly find the specific location of the gas leakage through the first transparent observation area and the second transparent observation area, and then find the processing link that causes the gas leakage position according to the rule of the gas leakage position, so as to improve the processing link that causes the gas leakage in the subsequent process. The operation method of the bipolar plate gas leakage position detection device 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 using expensive and complex equipment.

[0055] Referring to Figure 1 and Figure 2 In one embodiment, the first plate 1 and / or the second plate 2 are transparent plates, so that an inspector can observe the flow direction of the colored liquid through the fully transparent first plate 1 and / or the second plate 2 to determine whether there is a gas leakage problem in the liquid flow channel and directly find the specific location of the gas leakage when there is a gas leakage problem.

[0056] Specifically, the first plate 1 and the second plate 2 are 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 that are fully transparent are more convenient for observing the condition of the bipolar plate 4.

[0057] More specifically, the material of the first plate 1 and the second plate 2 is selected from polymethyl methacrylate, polycarbonate, glass fiber reinforced polypropylene, glass, transparent ABS or transparent nylon. Among them, polymethyl methacrylate is a material with high transparency, low price, easy to machine and other advantages, often used as a substitute for glass. Its density is about 1.15-1.19g / cm³, which is half of the glass, and the mechanical strength is higher, and the tensile and impact resistance is 7-18 times higher than ordinary glass. Polycarbonate is an amorphous engineering material with excellent impact strength, thermal stability, gloss, bacterial inhibition, flame retardant and anti-pollution properties. Glass fiber reinforced polypropylene is a composite material that combines the excellent performance of polypropylene resin and 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 material. The molecular arrangement of glass is random, isotropic, and has no fixed melting point, and changes from solid to liquid in a certain temperature range, and has metastability, 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 more demanding optical applications. Transparent nylon has excellent bending fatigue strength and extremely high chemical resistance, suitable for applications under dynamic load conditions, and is less prone to stress cracking when in contact with media.

[0060] Referring to Figure 3 and Figure 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 plug the liquid outlet 12 on the liquid channel to be detected 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 and correspondingly provided 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 detected, a plug can be arranged 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 detected at the same time, plugs can be arranged on the three liquid outlets 12.

[0063] In one of the embodiments, the plug is detachably arranged on the liquid outlet 12 so as to be replaced according to the requirement. Specifically, the plug is threadedly connected with the liquid outlet 12 so as to ensure the plugging effect of the plug 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 as to replace the positions of the liquid inlet 11 and the liquid outlet 12 during the detection process without the need of searching for the positions of the liquid inlet 11 and the liquid outlet 12, thereby facilitating the detection operation. That is, it can be understood that, during the specific test process, the liquid inlet 11 can be used as the port for injecting the colored liquid, and the liquid outlet 12 can also be used as the port for injecting the colored liquid.

[0065] For example, when the liquid inlet 11 is used as the port for injecting the colored liquid, the plug is plugged 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 gas with a certain pressure is introduced to determine whether the liquid flow channel has a gas leakage problem. When the liquid outlet 12 is used as the port for injecting the colored liquid, the plug is plugged 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 gas with a certain pressure is introduced to determine whether the liquid flow channel has a gas leakage problem. In summary, the structure can facilitate the detection operation without the need of searching for the positions of the liquid inlet 11 and the liquid outlet 12.

[0066] Referring to Figure 1 , Figure 3 and Figure 4 , in one of the embodiments, the auxiliary member 3 is detachably arranged on the first plate member 1 and the second plate member 2. Specifically, the auxiliary member 3 comprises a first fastening assembly 31 and a second fastening assembly 32, and the first fastening assembly 31 and the second fastening assembly 32 are arranged in the short edge direction of the first plate member 1. The first fastening assembly 31 comprises a plurality of first fastening members 33, and the plurality of first fastening members 33 are arranged in the long edge direction of the first plate member 1. The second fastening assembly 32 comprises a plurality of second fastening members 34, and the plurality of second fastening members 34 are arranged in the long edge direction of the second plate member 2. The fastening connection of the first plate member 1 and the second plate member 2 is realized through the cooperation of the plurality of first fastening members 33 and the plurality of second fastening members 34.

[0067] More specifically, referring to Figure 3 and Figure 4The first fastener 33 and the second fastener 34 each include a bolt, a first nut and a second nut, the bolt is arranged on the first plate 1 and the second plate 2, and the first nut and the second nut are respectively screwed on the two sides of the bolt and abut against the first plate 1 and the second plate 2. The structure can fasten the first plate 1 and the second plate 2 without using complex devices such as air cylinders and motors, has a simple overall structure, can complete the detection of the metal bipolar plate 4 without using expensive and complex devices, and is beneficial to reducing the cost in the production process.

[0068] The embodiment of the application also provides a detection method for a gas leakage position of a bipolar plate, which is used for the bipolar plate gas leakage position detection device of any one of the above embodiments, and includes the following steps.

[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 part 3, and the first sealing part 41 on the bipolar plate 4 abuts against the first plate 1, and the second sealing part on the bipolar plate 4 abuts against the second plate 2.

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

[0073] The 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, 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.

[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. 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 application, the colored liquid can also enter the inlet (which is one of the water inlet, the fuel inlet or the oxidant inlet) located in the middle of the bipolar plate 4 through the liquid inlet 11 located in the middle of the first plate 1 for detection.

[0076] When one of the water flow channel, the fuel flow channel and the oxidant flow channel needs to be detected, only the plug is arranged on the liquid outlet 12 corresponding to the outlet of the flow channel, and then the colored liquid is injected into the liquid inlet 42 corresponding to the flow channel. When the water flow channel, the fuel flow channel and the oxidant flow channel need to be detected at the same time, plugs are arranged on the three liquid outlets 12, and then the colored liquid is injected into the water inlet, the fuel inlet and the oxidant inlet through the three liquid inlets 11, 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 communicated with the inlet, the 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 member 1 and / or the second transparent observation area on the second plate member 2. After the colored liquid fills part or all of the liquid flow channel, the gas with a pressure in the range of 10 kpa-350 kpa is introduced into the inlet, and the duration is 5 s-60 s. More specifically, the pressure of the introduced gas is 50 kpa.

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

[0080] The flow of the colored liquid is observed, and it is judged whether the liquid flow channel has a gas leakage problem and the gas leakage position causing the gas leakage problem. That is, the colored liquid can overflow through the gas leakage position which cannot be observed by naked eyes in the production process such as stamping, welding and bonding under the driving of gas pressure, and the detection personnel can intuitively find the specific position of the gas 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. The solution with a pH value between 6 and 8 is generally considered to be mild, which will not cause corrosion damage to the metal bipolar plate 4, and is beneficial to the cleaning of the metal bipolar plate 4 after the detection is completed.

[0082] It can be understood that the pH value is a value indicating the acidity and alkalinity of a solution, which is defined as the negative logarithm of the hydrogen ion concentration, and the range of the pH value is generally between 0 and 14, wherein the pH value of 7 is considered to be neutral, the pH value greater than 7 indicates that the solution is alkaline, and the 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 method for detecting the gas leakage position of the bipolar plate can fasten and clamp the bipolar plate 4 through the first plate 1 and the second plate 2 of the bipolar plate gas 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. At the same time, colored liquid and gas with a certain pressure can be injected into the inlet of the bipolar plate 4 and the liquid flow channel inside the bipolar plate 4 through the liquid inlet 11 on the first plate 1 to determine whether there is a gas leakage problem in the liquid flow channel. When the bipolar plate 4 has a gas leakage position that cannot be observed by the naked eye during the production process such as stamping, welding and bonding, the colored liquid can overflow through the gas leakage position under the action of gas pressure, so that the detection personnel can intuitively find the specific position of the gas leakage through the first transparent observation area and the second transparent observation area. Then, according to the law of the gas leakage position, the processing link causing the gas leakage position can be found, so as to improve the processing link causing the gas leakage in the subsequent process. The method for detecting the gas leakage position of the bipolar plate is simple to operate and is beneficial to reduce the cost in the production process. The detection of the metal bipolar plate 4 can be completed without using expensive and complex equipment.

[0084] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0085] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A gas leakage position detecting device for bipolar plates, characterized by comprising: The application relates to a bipolar plate observation device, comprising: a first plate member with a first transparent observation area, wherein a plurality of liquid inlets are arranged on the first plate member, and the plurality of liquid inlets are arranged one by one in correspondence with a plurality of liquid inlets of a bipolar plate; a second plate member with a second transparent observation area; an auxiliary member arranged on the first plate member and / or the second plate member, wherein the auxiliary member is used for connecting the first plate member and the second plate member, and can adjust the distance between the first plate member and the second plate member, so that the bipolar plate can be fastened between the first plate member and the second plate member; wherein the first transparent observation area and the second transparent observation area are used for observing the fastened bipolar plate.

2. The bipolar plate gas leak location detection apparatus according to claim 1, characterized by The first plate member and / or the second plate member are transparent plates.

3. The bipolar plate gas leak location detection apparatus of claim 1, wherein A plurality of liquid outlets are arranged on the first plate member, the plurality of liquid outlets are arranged one by one in correspondence with a 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 gas leak location detection apparatus of claim 3, wherein The plug is arranged on the liquid outlet in a detachable manner.

5. The bipolar plate gas leak location detection apparatus of claim 3, wherein The inner diameter of the liquid inlet is consistent with the inner diameter of the liquid outlet.

6. The bipolar plate gas leak location detection apparatus of claim 1, wherein The auxiliary member is arranged on the first plate member and the second plate member in a detachable manner.

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