Tool and method for nondestructive detection of membrane electrode series leakage position

Abstract

The invention relates to a tool and a method for non-destructively detecting a series leakage position of a membrane electrode, the tool is suitable for the membrane electrode, and the tool comprises a first air tightness detection plate, a second air tightness detection plate and a fastening part; the membrane electrode is placed between the first airtight detection plate and the second airtight detection plate; the first air tightness detection plate, the membrane electrode and the second air tightness detection plate are all arranged in the fastening part; a first detection cavity is formed in one side, close to the membrane electrode, of the first airtight detection plate, and a second detection cavity is formed in one side, close to the membrane electrode, of the second airtight detection plate; the active area, close to one side of the first airtight detection plate, of the membrane electrode is arranged in the first detection cavity, and the active area, close to one side of the second airtight detection plate, of the membrane electrode is arranged in the second detection cavity; the area, corresponding to the second detection cavity, of the second airtightness detection plate is set to be a transparent area. The area, corresponding to the transparent area, of the fastening part is provided with an observation window. According to the invention, rapid testing of the leakage amount of the membrane electrode string can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and in particular to a tool and method for non-destructively detecting membrane electrode cross-leakage positions. Background Art

[0002] Hydrogen fuel cells are driving global energy transformation. The performance and life of fuel cells largely depend on the performance and life of membrane electrodes. Therefore, in-depth research on the failure mode of membrane electrodes is crucial.

[0003] Hydrogen-oxygen cross-leakage is the most dangerous type of membrane electrode failure mode, which can cause abnormal membrane electrode performance, local overheating and combustion, and even hydrogen leakage and explosion. There are many reasons for membrane electrode cross-leakage, and the amount of cross-leakage and the location of cross-leakage caused by different reasons may be different. Based on the information of cross-leakage amount and location, the cause of cross-leakage can be effectively inferred, providing a strong basis for failure analysis.

[0004] There are many methods and equipment for detecting fuel cell leakage. The existing membrane electrode leakage detection technology can only detect the membrane electrode leakage, but it is difficult to detect and identify the specific leakage location (such as the specific leakage location in the membrane electrode active area), especially the membrane electrode with no obvious damage on the outside.

[0005] At present, the common methods for identifying the cross-leakage position include CCM light transmission method, microscopic observation method, etc. These methods require the gas diffusion layer on both sides of the CCM to be uncovered before the CCM is inspected. This method causes a certain degree of damage to the membrane electrode and cannot 100% guarantee that the tiny cross-leakage position can be identified. Summary of the invention

[0006] Based on this, the present invention provides a tool and method for non-destructive detection of membrane electrode leakage position, aiming to solve the problems that the existing fuel cell leakage detection cannot quickly detect the membrane electrode leakage amount and leakage position, and the membrane electrode is easily damaged during the detection process. The present application can realize the detection of membrane electrode leakage amount and leakage position, and ensure the integrity of the membrane electrode appearance without affecting subsequent analysis and detection.

[0007] To achieve the above-mentioned purpose, on the one hand, the embodiment of the present invention proposes the following technical solutions: a tool for non-destructive detection of membrane electrode leakage position, applicable to the membrane electrode, comprising a first airtight detection plate (i.e., bottom plate), a second airtight detection plate (i.e., top plate) and a fastening component; the membrane electrode is placed between the first airtight detection plate and the second airtight detection plate; the first airtight detection plate, the membrane electrode and the second airtight detection plate are all arranged in the fastening component;

[0008] A first detection cavity is provided on a side of the first airtight detection plate close to the membrane electrode, and a second detection cavity is provided on a side of the second airtight detection plate close to the membrane electrode; an active area of ​​the membrane electrode close to the first airtight detection plate is provided in the first detection cavity, and an active area of ​​the membrane electrode close to the second airtight detection plate is provided in the second detection cavity;

[0009] The area of ​​the second airtight detection plate corresponding to the second detection cavity is set as a transparent area; and the area of ​​the fastening component corresponding to the transparent area is set as an observation window.

[0010] As a preferred embodiment, a first inlet and a first outlet are provided on one side of the first airtight detection plate, and the first inlet and the first outlet are respectively connected to the first detection cavity. The first inlet and the first outlet enable the detection gas and the detection liquid to be introduced and discharged; the first inlet and the first outlet are connected inwardly to the first detection cavity, and are connected to the ventilation and water pipes, valves and instruments outwardly.

[0011] As a preferred embodiment, a second inlet and a second outlet are provided on one side of the second airtight detection plate, and the second inlet and the second outlet are respectively connected to the second detection cavity; the second inlet, the second outlet, the first inlet and the first outlet are arranged on the same side. The second inlet and the second outlet are used to allow the detection gas and the detection liquid to enter and exit; the second inlet and the second outlet are connected inwardly to the second detection cavity, and are connected to the ventilation and water pipes, valves and instruments outwardly.

[0012] As a preferred embodiment, the depth of the first detection cavity is 0.5 mm to 5 mm; the depth of the second detection cavity is 0.5 mm to 5 mm. By providing the first detection cavity and the second detection cavity, it can be used to store detection gas and detection liquid.

[0013] As a preferred embodiment, the transparent area is a transparent acrylic plate or a transparent PC plate. The membrane electrode can be clearly observed through the observation window and the transparent area.

[0014] As a preferred embodiment, a first sealing groove is provided on the side of the first airtight detection plate close to the second airtight detection plate; a second sealing groove is provided on the side of the second airtight detection plate close to the first airtight detection plate; the first sealing groove and the second sealing groove are arranged opposite to each other, and the first sealing groove and the second sealing groove have the same size.

[0015] As a preferred embodiment, sealant is provided in both the first sealing groove and the second sealing groove, and the sealant is provided in contact with the membrane electrode; the sealant is provided by laying a sealing rubber ring, laying a sealing rubber pad or dispensing. The first sealing groove, the second sealing groove and the sealant can achieve sealing between the first airtight detection plate, the second airtight detection plate and the membrane electrode. The area between the outer edge of the membrane electrode GDL (gas diffusion layer) and the edge of the frame is the sealing area, and the area within the sealing ring is the airtight detection area. The airtight detection area is provided on the inner side of the sealing area, and the observation range of the observation window covers the entire airtight detection area.

[0016] As a preferred embodiment, the first airtight detection plate and the membrane electrode, and the first airtight detection plate and the second airtight detection plate are fixedly connected by means of internal positioning, external positioning or mixed positioning.

[0017] As a preferred embodiment, when the first airtight detection plate and the membrane electrode, and the first airtight detection plate and the second airtight detection plate are fixedly connected by internal positioning, a protrusion is provided on the side of the first airtight detection plate close to the membrane electrode, and a recessed hole is provided on the side of the second airtight detection plate close to the membrane electrode, and the protrusion is clamped in the recessed hole; one end of the membrane electrode close to the protrusion is abutted against the protrusion.

[0018] As a preferred embodiment, the protrusion is arranged outside the first sealing groove; the protrusion is matched with the concave hole; the protrusion is integrally formed with the first airtight detection plate. This arrangement can ensure the sealing between each other, effectively save the space consumed by fixing, and is easy to disassemble and assemble.

[0019] As a preferred embodiment, the fastening component fixes the first airtight detection plate and the second airtight detection plate by means of cylinder pressure fastening, screw fixing, strap fixing, quick clamp fixing or external press fixing.

[0020] As a preferred embodiment, when the fastening component fixes the first airtight detection plate and the second airtight detection plate by means of cylinder pressurization and fastening, the pressure of the cylinder pressurization and fastening is 0.1 MPa to 5 MPa.

[0021] As a preferred embodiment, the fastening component includes a first fastening plate, a second fastening plate and several fastening screws; the first fastening plate is arranged in abutment with the first airtight detection plate, and the second fastening plate is arranged in abutment with the second airtight detection plate; several of the fastening screws are evenly arranged on the outside of the first airtight detection plate (second airtight detection plate); one end of each of the fastening screws is connected to the first fastening plate, and the other end is connected to the second fastening plate.

[0022] As a preferred embodiment, the observation window is provided on the second fastening plate; a sliding rod is provided in the observation window, and the sliding rod is slidably connected to the side of the observation window. By providing the sliding rod, the strength of the second airtight detection plate can be enhanced, which is convenient for flexible observation. In the embodiment of the present application, two sliding rods are provided, and the two sliding rods are arranged parallel to each other.

[0023] As a preferred embodiment, the temperature range of the tooling for non-destructive detection of membrane electrode leakage is -10°C to 120°C. In the embodiment of the present application, the airtight detection plate, sealant and other components of the tooling are made of heat-resistant materials, effectively ensuring that the temperature range of the tooling is -10°C to 120°C.

[0024] On the other hand, an embodiment of the present application further provides a method for non-destructively detecting a location of a membrane electrode cross-leakage, and the method is implemented by the tooling for non-destructively detecting a location of a membrane electrode cross-leakage.

[0025] Beneficial effects achieved by the present invention: Through the structure of the present application, rapid testing of membrane electrode leakage can be achieved, and it is compatible with the flow method and the pressure maintenance method. The present application can simulate high and low temperature environments to detect the location and amount of membrane electrode leakage in the range of 1°C to 99°C. The structure of the present application can be applied to membrane electrodes of any active area, without any appearance or structural damage to the membrane electrode, and the location of membrane electrode leakage can be quickly identified. The present application has a simple structure, is easy to disassemble and assemble, and is easy to maintain. It can effectively extend the service life of the battery, has high practicality and economy, and has a wide range of applications. It can be produced and used as a general product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a tool for non-destructive detection of membrane electrode cross-leakage positions according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the top view of the tooling for non-destructive detection of membrane electrode cross-leakage positions;

[0029] Figure 3 for Figure 1 A schematic diagram of a part of the structure of a tool for non-destructive detection of membrane electrode cross-leakage positions;

[0030] Figure 4 for Figure 3 Schematic diagram of the cross-section of the core structure of the structure (not to scale).

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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 specific circumstances.

[0035] It should be noted that when 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 an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Through the structure of the present application, the membrane electrode leakage amount test and membrane electrode leakage position detection can be realized, and the appearance of the membrane electrode can be guaranteed to be intact without affecting subsequent analysis and detection.

[0038] Specifically, Figures 1 to 3 As shown, on the one hand, the embodiment of the present invention proposes the following technical solutions: a tool for non-destructive detection of membrane electrode leakage position, suitable for a membrane electrode 100, comprising a first airtight detection plate 10 (i.e., bottom plate), a second airtight detection plate 20 (i.e., top plate) and a fastening component 30; the membrane electrode 100 is placed between the first airtight detection plate 10 and the second airtight detection plate 20; the first airtight detection plate 10, the membrane electrode 100 and the second airtight detection plate 20 are all arranged in the fastening component 30;

[0039] A first detection cavity 11 is provided on a side of the first airtight detection plate 10 close to the membrane electrode 100, and a second detection cavity 21 is provided on a side of the second airtight detection plate 20 close to the membrane electrode 100; an active area of ​​the membrane electrode 100 close to the first airtight detection plate 10 is provided in the first detection cavity 11, and an active area of ​​the membrane electrode 100 close to the second airtight detection plate 20 is provided in the second detection cavity 21;

[0040] The area of ​​the second airtight detection plate 20 corresponding to the second detection cavity 21 is set as a transparent area; the area of ​​the fastening component 30 corresponding to the transparent area is set as an observation window 31.

[0041] As a preferred embodiment, a first inlet 12 and a first outlet 13 are provided on one side of the first airtight detection plate 10, and the first inlet 12 and the first outlet 13 are respectively connected to the first detection cavity 11. The first inlet 12 and the first outlet 13 are used to allow the detection gas and the detection liquid to enter and exit; the first inlet 12 and the first outlet 13 are connected inwardly to the first detection cavity 11, and are connected to the ventilation and water pipes, valves and instruments outwardly.

[0042] As a preferred embodiment, a second inlet 22 and a second outlet 23 are provided on one side of the second airtight detection plate 20, and the second inlet 22 and the second outlet 23 are respectively connected to the second detection chamber 21; the second inlet 22, the second outlet 23, the first inlet 12 and the first outlet 13 are arranged on the same side. The second inlet 22 and the second outlet 23 are used to allow the detection gas and the detection liquid to enter and be discharged; the second inlet 22 and the second outlet 23 are connected inwardly to the second detection chamber 21, and are connected to the ventilation and water pipes, valves and instruments outwardly.

[0043] As a preferred embodiment, the depth of the first detection cavity 11 is 0.5 mm to 5 mm; the depth of the second detection cavity 21 is 0.5 mm to 5 mm. The first detection cavity 11 and the second detection cavity 21 can be used to store detection gas and detection liquid.

[0044] As a preferred embodiment, the transparent area is a transparent acrylic plate or a transparent PC plate. The membrane electrode can be clearly observed through the observation window and the transparent area.

[0045] As a preferred embodiment, a first sealing groove 14 is provided on the side of the first airtight detection plate 10 close to the second airtight detection plate 20; a second sealing groove 24 is provided on the side of the second airtight detection plate 20 close to the first airtight detection plate 10; the first sealing groove 14 and the second sealing groove 24 are arranged opposite to each other, and the first sealing groove 14 and the second sealing groove 24 have the same size.

[0046] As a preferred embodiment, a sealant 40 is provided in both the first sealing groove 14 and the second sealing groove 24, and the sealant 40 is provided in contact with the membrane electrode 30; the sealant 40 is provided by laying a sealing rubber ring, laying a sealing rubber pad or dispensing. Through the first sealing groove 14, the second sealing groove 24 and the sealant 40, the sealing between the first airtight detection plate 10, the second airtight detection plate 20 and the membrane electrode 100 can be achieved. The area between the outer edge of the membrane electrode GDL (gas diffusion layer) and the edge of the frame is the sealing area, and the area within the sealing ring is the airtight detection area. The airtight detection area is provided on the inner side of the sealing area, and the observation range of the observation window covers the entire airtight detection area.

[0047] As a preferred embodiment, the first airtight detection plate 10 and the membrane electrode 100, and the first airtight detection plate 10 and the second airtight detection plate 20 are fixedly connected by means of internal positioning, external positioning or mixed positioning.

[0048] As a preferred embodiment, in the present application examples, Figure 4As shown, when the first airtight detection plate 10 and the membrane electrode 100, and the first airtight detection plate 10 and the second airtight detection plate 20 are fixedly connected by internal positioning, a protrusion 15 is provided on the side of the first airtight detection plate 10 close to the membrane electrode, and a concave hole 25 is provided on the side of the second airtight detection plate 20 close to the membrane electrode 100, and the protrusion 15 is clamped in the concave hole 25; the end of the membrane electrode 100 close to the protrusion 15 is abutted against the protrusion 15. The protrusion and the concave hole are arranged with interference fit, so that good sealing between them can be ensured.

[0049] As a preferred embodiment, the protrusion 15 is arranged outside the first sealing groove 14; the protrusion 15 is matched with the concave hole 25; the protrusion 15 is integrally formed with the first airtight detection plate 10. The distance between the inner edge of the sealing groove and the outer edge of the GDL (gas diffusion layer) is 1 mm. This arrangement can not only ensure the sealing between each other, but also effectively save the space consumed by fixing, and is easy to disassemble and assemble.

[0050] As a preferred embodiment, the fastening component 30 fixes the first airtight detection plate 10 and the second airtight detection plate 20 by cylinder pressure fastening, screw fixing, strap fixing, quick clamp fixing or external press fixing.

[0051] As a preferred implementation, in this embodiment, when the fastening component 30 fixes the first airtight detection plate 10 and the second airtight detection plate 20 by means of cylinder pressurized fastening, the pressure of the cylinder pressurized fastening is 0.1MPa~5MPa (depending on the actual needs of use, it can be 0.1MPa, or 0.5MPa, or 1.0MPa, or 1.5MPa, or 3MPa, or 5MPa, etc.).

[0052] As a preferred embodiment, the fastening component 30 includes a first fastening plate 32, a second fastening plate 33 and several fastening screws 34; the first fastening plate 32 is abutted against the first airtight detection plate 10, and the second fastening plate 33 is abutted against the second airtight detection plate 20; several of the fastening screws 34 are evenly arranged on the outside of the first airtight detection plate 10 (second airtight detection plate); one end of each of the fastening screws 34 is connected to the first fastening plate 32, and the other end is connected to the second fastening plate 33.

[0053] As a preferred embodiment, the observation window 31 is provided on the second fastening plate 33; a sliding rod 311 is provided in the observation window 31, and the sliding rod 311 is slidably connected to the side of the observation window 31. By providing the sliding rod 311, the strength of the second airtight detection plate 20 can be enhanced, which is convenient for flexible observation. In the embodiment of the present application, two sliding rods 311 are provided, and the two sliding rods 311 are arranged parallel to each other.

[0054] As a preferred embodiment, the temperature range of the tooling for non-destructive detection of membrane electrode leakage is -10°C to 120°C. In the embodiment of the present application, the airtight detection plate, sealant and other components of the tooling are made of heat-resistant materials, which effectively ensures that the temperature range of the tooling is -10°C to 120°C. Within this temperature range, all parts can maintain their original physical and chemical properties without failure forms such as breakage and hardening.

[0055] A flow meter and a valve are installed on the inlet pipeline of the first airtight detection plate; a valve is installed on the outlet pipeline of the first airtight detection plate; a three-way valve is installed on the inlet pipeline of the second airtight detection plate, and the three-way valve is respectively connected to the inlet, funnel and pressure gauge of the second airtight detection plate; a valve is installed on the outlet pipeline of the second airtight detection plate.

[0056] On the other hand, an embodiment of the present application further provides a method for non-destructively detecting a location of a membrane electrode cross-leakage, and the method is implemented by the tooling for non-destructively detecting a location of a membrane electrode cross-leakage.

[0057] The nondestructive testing method for membrane electrode is performed by using the tooling for nondestructively testing the leakage position of membrane electrode, which specifically includes the following steps:

[0058] (I) Nondestructive testing of membrane electrode leakage:

[0059] The tooling for non-destructive detection of membrane electrode leakage position of the present application can be used for conventional membrane electrode leakage detection, and is applicable to two leakage detection methods: flow method and pressure maintenance method. During the test, it can be equipped with airtight test bench or pressure gauge and other equipment and instruments as needed.

[0060] When conducting a cross-talk test, the membrane electrode is first positioned on the first airtight test plate, and then the second airtight test plate is covered, and the first airtight test plate and the second airtight test plate are pressed and fastened together with a fastening component. The applied pressure can be set based on experience and subsequent test requirements.

[0061] According to the test direction requirements (such as the cross-leakage from cathode to anode or from anode to cathode), select one of the first airtight test board and the second airtight test board, and introduce the test gas, generally air, nitrogen, argon, helium, helium-nitrogen mixture, etc., into the inlet, and close the outlet valve of the test board at the same time. According to the test requirements, keep the pressure in the test cavity on the ventilation side of the membrane electrode stable at a value between 20kPa and 3MPa, and the test cavity on the other side of the membrane electrode is connected to the atmosphere.

[0062] The cross-link leakage of the membrane electrode is tested according to the detection requirements of the flow method or the pressure maintenance method.

[0063] For example, 1.1, leakage detection from the upper side to the lower side of the membrane electrode:

[0064] (1) Position the membrane electrode on the first airtight detection plate, cover it with the second airtight detection plate, and use a fastening component to pressurize and fasten the first airtight detection plate and the second airtight detection plate together. Pass high-pressure gas into the cylinder of the fastening component so that the pressure applied to the airtight detection plate is constant at 1.5MPa±0.1MPa.

[0065] (2) Close the outlet valve of the second airtightness detection plate, connect the three-way valve on the inlet pipeline of the second airtightness detection plate to the inlet of the second airtightness detection plate and the pressure gauge. Introduce air into the inlet of the second airtightness detection plate to make the pressure in the second detection chamber reach 50 kPa.

[0066] (3) If the flow rate method is used to detect the cross-leakage, the pressure in the second detection chamber is maintained at 50 kPa during the entire test period. Close the outlet valve of the first airtight detection plate, and the flow meter at the inlet of the first airtight detection plate measures the gas flow rate flowing out of the inlet, and the outlet of the flow meter is connected to the atmosphere. After the reading stabilizes, read the gas flow rate flowing out of the first airtight detection plate, which is the cross-leakage of the membrane electrode.

[0067] (4) If the pressure-maintaining method is used to detect the cross-leakage, open the valve at the entrance and exit of the first airtight detection plate to connect the first detection chamber to the atmosphere. When the pressure in the second detection chamber reaches 50 kPa, stop introducing gas, close the valve at the entrance and exit of the second airtight detection plate, and start recording the time and the pressure change in the second detection chamber. After 20 minutes, the difference between the remaining pressure in the second detection chamber and 50 kPa is the cross-leakage of the membrane electrode.

[0068] 1.2. Detection of leakage from the bottom to the top of the membrane electrode:

[0069] 50kPa gas is introduced into the first airtight detection plate, and the second airtight detection plate is connected to the atmosphere. Other operations are similar to 1.1.

[0070] (II) Nondestructive testing of membrane electrode leakage position:

[0071] When testing the cross-leakage position, first position the membrane electrode on the first airtight detection plate, then cover the second airtight detection plate, and pressurize and fasten the first airtight detection plate and the second airtight detection plate together with a fastening component. The applied pressure can be set according to experience and subsequent test requirements (e.g., 1.5MPa±0.1MPa).

[0072] The three-way valve on the inlet pipeline of the second airtight detection plate connects the inlet of the second airtight detection plate and the funnel. Open the outlet valve of the second airtight detection plate. Pass deionized water of a certain temperature from the funnel into the second airtight detection plate. The temperature range of the deionized water is 1°C to 99°C (for example, 25°C). Make the deionized water completely fill the second detection cavity.

[0073] A test gas of a certain pressure is introduced into the first airtight test plate, generally air, nitrogen, argon, helium, helium-nitrogen mixed gas, etc., and the outlet valve of the first airtight test plate is closed at the same time. According to the test requirements, the pressure in the first test cavity is kept stable at a value between 20kPa and 3MPa (for example, 50kPa).

[0074] Maintain the pressure in the first detection chamber for a period of time, and observe whether bubbles are formed on the membrane electrode in the detection area from the observation window and through the transparent area, and record the position and speed of bubble formation to analyze and determine the membrane electrode leakage position and leakage rate.

[0075] If a flow meter is connected to the inlet of the first airtight detection plate, the leakage amount of the membrane electrode can be measured while detecting the leakage position.

[0076] Through the structure of this application, rapid testing of membrane electrode leakage can be achieved, and it is compatible with the flow method and the pressure maintenance method. This application can simulate high and low temperature environments to detect the location and amount of membrane electrode leakage in the range of 1°C to 99°C. The structure of this application can be applied to membrane electrodes of any active area, without any appearance or structural damage to the membrane electrode, and the location of membrane electrode leakage can be quickly identified. This application has a simple structure, is easy to disassemble and assemble, and is easy to maintain. It can effectively extend the service life of the battery, has high practicality and economy, and has a wide range of applications. It can be produced and used as a general product.

[0077] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0078] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0079] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A tool for non-destructive detection of membrane electrode leakage position, characterized in that: Applicable to membrane electrode, comprising a first airtight detection plate, a second airtight detection plate and a fastening component; the membrane electrode is placed between the first airtight detection plate and the second airtight detection plate; the first airtight detection plate, the membrane electrode and the second airtight detection plate are all arranged in the fastening component; A first detection cavity is provided on a side of the first airtight detection plate close to the membrane electrode, and a second detection cavity is provided on a side of the second airtight detection plate close to the membrane electrode; an active area of ​​the membrane electrode close to the first airtight detection plate is provided in the first detection cavity, and an active area of ​​the membrane electrode close to the second airtight detection plate is provided in the second detection cavity; The area of ​​the second airtight detection plate corresponding to the second detection cavity is set as a transparent area; and the area of ​​the fastening component corresponding to the transparent area is set as an observation window.

2. The tooling for non-destructive detection of membrane electrode cross-leakage position according to claim 1 is characterized in that: A first inlet and a first outlet are provided on one side of the first airtight detection plate, and the first inlet and the first outlet are respectively connected to the first detection cavity; A second inlet and a second outlet are provided on one side of the second airtight detection plate. The second inlet and the second outlet are connected to the second detection cavity respectively. The second inlet, the second outlet, the first inlet and the first outlet are provided on the same side.

3. The tooling for non-destructive detection of membrane electrode leakage position according to claim 1 is characterized in that: The depth of the first detection cavity is 0.5 mm to 5 mm; the depth of the second detection cavity is 0.5 mm to 5 mm; The transparent area is a transparent acrylic plate or a transparent PC plate; A first sealing groove is provided on the side of the first airtight detection plate close to the second airtight detection plate; a second sealing groove is provided on the side of the second airtight detection plate close to the first airtight detection plate; the first sealing groove and the second sealing groove are arranged opposite to each other, and the first sealing groove and the second sealing groove have the same size.

4. The tooling for non-destructive detection of membrane electrode leakage position according to claim 3 is characterized in that: Sealant is provided in the first sealing groove and the second sealing groove, and the sealant is provided in contact with the membrane electrode; the sealant is provided by laying a sealing rubber ring, laying a sealing rubber pad or dispensing.

5. The tooling for non-destructive detection of membrane electrode leakage position according to claim 1, characterized in that: The first airtight detection plate and the membrane electrode, and the first airtight detection plate and the second airtight detection plate are fixedly connected by means of internal positioning, external positioning or mixed positioning; When the first airtight detection plate and the membrane electrode, and the first airtight detection plate and the second airtight detection plate are fixedly connected through internal positioning, a protrusion is provided on the side of the first airtight detection plate close to the membrane electrode, and a concave hole is provided on the side of the second airtight detection plate close to the membrane electrode, and the protrusion is stuck in the concave hole; one end of the membrane electrode close to the protrusion is abutted against the protrusion.

6. The tooling for non-destructive detection of membrane electrode cross-leakage position according to claim 5 is characterized in that: The protrusion is arranged on the outer side of the first sealing groove; the protrusion is matched with the concave hole; the protrusion and the first airtight detection plate are integrally formed.

7. The tooling for nondestructive detection of membrane electrode leakage position according to claim 1 is characterized in that: The fastening component fixes the first airtightness detection plate and the second airtightness detection plate by means of cylinder pressure fastening, screw fixing, strap fixing, quick clamp fixing or external press fixing; When the fastening component fixes the first airtight detection plate and the second airtight detection plate by means of cylinder pressurization and fastening, the pressure of the cylinder pressurization and fastening is 0.1 MPa to 5 MPa.

8. The tooling for non-destructive detection of membrane electrode leakage position according to claim 1 is characterized in that: The fastening component includes a first fastening plate, a second fastening plate and several fastening screws; the first fastening plate is arranged in abutment with the first airtight detection plate, and the second fastening plate is arranged in abutment with the second airtight detection plate; several fastening screws are evenly arranged on the outside of the first airtight detection plate; one end of each fastening screw is connected to the first fastening plate, and the other end is connected to the second fastening plate.

9. The tooling for non-destructive detection of membrane electrode cross-leakage position according to claim 8, characterized in that: The observation window is arranged on the second fastening plate; a sliding rod is arranged in the observation window, and the sliding rod is slidably connected to the side of the observation window; The temperature range of the tooling for non-destructive detection of membrane electrode leakage position is -10°C to 120°C.

10. A method for non-destructive detection of membrane electrode cross-leakage position, characterized in that: The method is implemented by the tooling for non-destructive detection of membrane electrode leakage positions as described in any one of claims 1 to 9.

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