Air permeability testing apparatus

Abstract

The application relates to the technical field of air permeability detection, and provides an air permeability testing device, which comprises a box body, a storage table, a fixer, an air source and a detector. The storage table is arranged in the box body, and a cavity is arranged in the storage table. A detection opening, an air inlet hole and an air outlet hole which are in communication with the cavity are further arranged on the storage table. The fixer is detachably connected with the storage table and is used for fixing and sealing the edge area of a film layer to be detected in cooperation with the storage table. The detector is arranged outside the box body and is connected with the air outlet hole and is used for detecting the concentration of the air discharged from the cavity. The air permeability testing device can meet the air permeability detection of the film layer under various environments.

Description

Technical Field

[0001] This application relates to the field of air permeability testing technology, and in particular to an air permeability testing device. Background Technology

[0002] Photovoltaic cells (such as TOPCon, HJT, and tandem cells) are highly sensitive to moisture, therefore, accurate testing of the water and oxygen permeability of photovoltaic module encapsulation materials (such as encapsulants, backsheets, and aluminum foil tapes) is necessary. Traditional technology uses infrared water / oxygen permeability testing (GB / T 21529-2008 "Determination of Water Vapor Transmission Rate of Plastic Films and Sheets") for this purpose. This method directly places the infrared sensor on the sealed side of the encapsulation material to detect the water vapor or oxygen concentration there. However, when simulating the permeability of the encapsulation material at higher temperatures (e.g., above 45°C), the infrared detection results become abnormal due to the increased ambient temperature, making it difficult to evaluate the permeability performance of the encapsulation material at high temperatures. Utility Model Content

[0003] Based on this, this application provides a breathability testing device with high accuracy in detecting breathability performance under high temperature conditions.

[0004] This application provides an air permeability testing device, the air permeability testing device comprising:

[0005] Box;

[0006] A storage platform is provided inside the box. The storage platform has a cavity inside and a detection port, an air inlet, and an air outlet that communicate with the cavity.

[0007] A retainer, detachably connected to the stage, is used to cooperate with the stage to fix and seal the edge region of the film layer to be tested; and,

[0008] A detector is disposed outside the housing and connected to the vent, for detecting the concentration of gas discharged from the cavity.

[0009] In some embodiments, the fixture includes a first fixture and a second fixture, both detachably connected to the platform. The first fixture is used to fix the film layer to be tested in a direction parallel to the plane of the platform; the second fixture is used to fix the film layer to be tested in a direction perpendicular to the plane of the platform.

[0010] In some embodiments, the first fixture includes a first clamping plate and a first connector. The first clamping plate has an opening and is detachably connected to the side of the platform with the detection port via the first connector. The opening corresponds to the position of the detection port so that the first clamping plate clamps and fixes the film layer to be tested to the platform.

[0011] In some embodiments, the first fixture further includes a first seal disposed at the edge of the first clamping plate for sealing the gap between the first clamping plate and the shelf.

[0012] In some embodiments, the second fixture includes a combination clamp and a second connector. The combination clamp is detachably connected to the side of the platform with the detection port via the second connector. The combination clamp includes a second clamping plate and a third clamping plate disposed opposite to each other. The second clamping plate and the third clamping plate clamp and fix the film layer to be tested along the thickness direction, and the film layer to be tested located between the second clamping plate and the third clamping plate corresponds to the position of the detection port.

[0013] The second fixture also includes a plurality of second seals disposed at the edge between the second clamping plate and the third clamping plate for sealing a set of oppositely disposed sides of the membrane layer to be tested.

[0014] In some embodiments, the second retainer further includes a plurality of third seals, which are respectively disposed on the side of the second clamping plate near the table and on the side of the third clamping plate near the table, to seal the space between the second clamping plate and the table, and the space between the third clamping plate and the table, respectively.

[0015] In some embodiments, the air permeability testing device further includes a heater disposed within the chamber, the heater being used to regulate the temperature within the chamber.

[0016] In some embodiments, the air permeability testing device further includes a water vapor generator connected to the chamber, the water vapor generator being used to regulate the humidity inside the chamber.

[0017] In some embodiments, the air permeability testing device further includes a gas regulator connected to the housing, the gas regulator being used to adjust the gas composition inside the housing.

[0018] In some embodiments, the detector includes at least one of a water vapor concentration detector and an oxygen concentration detector.

[0019] In some embodiments, the air permeability testing device further includes an air source connected to the air inlet for introducing purge gas into the cavity.

[0020] In some embodiments, the surface of the shelf is covered with a heat-insulating layer.

[0021] In some embodiments, the air permeability testing device further includes a first air pressure sensor disposed inside the chamber for detecting the air pressure inside the chamber.

[0022] In some embodiments, the air permeability testing device further includes a second air pressure sensor, which is disposed on the platform and used to detect the air pressure inside the cavity.

[0023] Compared with traditional technologies, this application has at least the following beneficial effects:

[0024] This application uses a fixture to fix the membrane layer under test onto a cavity-containing stage. The ambient gas inside the chamber simulates the working environment. The ambient gas enters the cavity through the test port from the membrane layer under test. Purge gas is introduced through the air inlet to deliver the gas permeated through the membrane layer to the detector for detection. By introducing purge gas through the air inlet to deliver the gas permeated through the membrane layer to the detector, this application avoids the problem of being easily affected by environmental parameters when performing tests directly inside the chamber. This enables permeability testing under different environmental conditions and improves the accuracy of the results. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an air permeability testing device provided in one embodiment of this application;

[0026] Figure 2 This is a cross-sectional schematic diagram of a test film layer in the thickness direction for air permeability testing according to one embodiment of this application;

[0027] Figure 3 This is a top view schematic diagram of a test of the air permeability of a membrane layer in the thickness direction provided in one embodiment of this application;

[0028] Figure 4 This is a schematic cross-sectional view of a test membrane layer for air permeability testing in a direction perpendicular to its thickness, provided in one embodiment of this application.

[0029] Figure 5 This is a top view schematic diagram of an air permeability test of a film layer under test in a direction perpendicular to its thickness, provided in one embodiment of this application.

[0030] Among them, 100-box body; 200-storage platform; 210-cavity; 220-detection port; 230-air inlet; 240-air outlet; 300-fixture; 310-first clamping plate; 311-opening; 320-first connector; 330-first seal; 340-second clamping plate; 350-third clamping plate; 360-third seal; 370-second seal; 400-air source; 500-detector; 600-heater; 700-water vapor generator; 800-gas regulator; 900-first pressure sensor. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings, embodiments, and examples. These embodiments and examples are for illustrative purposes only and are not intended to limit the scope of the present application. The purpose of providing these embodiments and examples is to enable a more thorough and comprehensive understanding of the disclosure of the present application. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various modifications or alterations without departing from the spirit of the present application, and the equivalent forms obtained also fall within the protection scope of the present application. Furthermore, numerous specific details are set forth in the following description to provide a fuller understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0032] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "fixed," and "set" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application according to the specific circumstances.

[0034] In this application, "optionally," "optionally," and "optional" mean that something is optional, that is, it means that it is selected from either "with" or "without." If there are multiple "optional" entries in a technical solution, unless otherwise specified, and there are no contradictions or mutual constraints, each "optional" entry shall be independent.

[0035] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0036] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0037] All references to this application are incorporated herein by reference as if each document were individually incorporated herein by reference. Unless they conflict with the purpose and / or technical solution of this application, all cited references are incorporated herein by reference in their entirety and for all purposes. When references are cited in this application, the definitions of relevant technical features, terms, nouns, phrases, etc., are also incorporated herein by reference. Examples and preferred embodiments of the cited technical features may also be incorporated herein by reference, but only to the extent that they enable the implementation of this application. It should be understood that when the cited content conflicts with the description in this application, this application shall prevail or modifications shall be made adaptably to the description in this application.

[0038] In traditional technology, infrared sensors are placed on the sealed side of the membrane to directly detect the gas permeating through it. However, in simulated high-temperature environments, the infrared sensors are also exposed to high temperatures, causing detection errors and making it impossible to test the gas permeability under high-temperature conditions. If the permeated gas is transported to the outside of the device through a pipeline before being detected by an infrared sensor, the gas disperses within the pipeline due to the low permeability of the membrane, making effective detection impossible.

[0039] Based on this, this application provides an air permeability testing device, such as... Figure 1 and Figure 2 As shown, the air permeability testing device includes a housing 100, a platform 200, a fixture 300, an air source 400, and a detector 500.

[0040] The stage 200 is housed within the enclosure 100. The stage 200 contains a cavity 210. The stage 200 also has a detection port 220, an air inlet 230, and an air outlet 240 communicating with the cavity 210. A fixture 300 is detachably connected to the stage 200 and is used to fix and seal the edge area of ​​the membrane layer to be tested. A detector 500 is located outside the enclosure 100 and connected to the air outlet 240, used to detect the concentration of the gas discharged from the cavity 210.

[0041] This application uses a fixture 300 to fix the membrane layer under test onto a stage 200 with a cavity 210. The ambient gas in the chamber 100 simulates the working environment. The ambient gas enters the cavity 210 through the detection port 220 from the membrane layer under test. Purge gas is introduced through the air inlet 230 to deliver the gas permeated through the membrane layer to the detector 500 for detection. By introducing purge gas through the air inlet 230 to deliver the gas permeated through the membrane layer to the detector 500, this application avoids the problem of being easily affected by environmental parameters when conducting tests directly inside the chamber 100. This enables permeability testing under different environmental conditions and improves the accuracy of the results.

[0042] It should be noted that the air permeability test in this application can be a test of the air permeability performance of a certain gas, or a test of the air permeability performance of water vapor. Those skilled in the art can conduct tests according to different air permeability requirements.

[0043] It is understandable that the platform 200 can be a material plate with an internal cavity 210, with a detection port 220 communicating with the cavity 210 on one side surface of the material plate, and an air inlet 230 and an air outlet 240 on the other side or the side of the material plate.

[0044] In some embodiments, the fixture 300 includes a first fixture and a second fixture, both detachably connected to the platform 200. The first fixture is used to fix the film layer to be tested in a direction parallel to the plane of the platform 200. The second fixture is used to fix the film layer to be tested in a direction perpendicular to the plane of the platform 200. In this application, the fixture 300 can fix the film layer to be tested in two ways. The first fixture can set the film layer to be tested in a direction parallel to the platform 200, thereby enabling the testing of the air permeability of the film layer in the thickness direction. The second fixture can set the film layer to be tested in a direction perpendicular to the platform 200, thereby enabling the testing of the air permeability of the film layer in the direction perpendicular to the thickness direction, thus satisfying the need to test the air permeability of the film layer under different usage conditions.

[0045] In some embodiments, such as Figure 2 and Figure 3 As shown, the first fixture includes a first clamping plate 310 and a first connecting member 320. An opening 311 is provided on the first clamping plate 310. The first clamping plate 310 is detachably connected to the side of the platform 200 with the detection port 220 via the first connecting member 320. The opening 311 corresponds to the position of the detection port 220, so that the first clamping plate 310 and the platform 200 clamp and fix the membrane layer to be tested. Optionally, to ensure the accuracy of the water permeability test, the shape and size of the opening 311 are the same as the shape and size of the detection port 220.

[0046] It is understood that this application does not impose specific requirements on the structure of the first connector 320, as long as it ensures the detachable connection between the first clamping plate 310 and the shelf 200. There can also be multiple first connectors 320. For example, the first connector 320 can be a clip or bolt mounted on the first clamping plate 310, or it can be a press-fit device, using a pressing method to achieve the connection, fixation, and disassembly of the first clamping plate 310 and the shelf 200. Exemplarily, the first connector 320 includes two pressure plates and a telescopic member disposed between the two pressure plates. The telescopic member controls the distance between the two pressure plates, thereby fixing the first clamping plate 310 and the shelf 200 by pressing.

[0047] In some embodiments, such as Figure 2 As shown, the first fixture also includes a first sealing element 330. The first sealing element 330 is disposed at the edge of the first clamping plate 310 and is used to seal the gap between the first clamping plate 310 and the stage 200. This application utilizes the first sealing element 330 to seal the gap between the first clamping plate 310 and the stage 200, further preventing ambient gas from entering from the edge of the film layer under test and affecting the accuracy of the test results.

[0048] It is understood that this application does not impose specific requirements on the structure of the first sealing element 330, as long as it can fulfill the sealing function. For example, the first sealing element 330 can be a sealing strip.

[0049] In some embodiments, such as Figure 4 and Figure 5 As shown, the second fixture includes a combined clamp and a second connector (not shown in the figure). The combined clamp is detachably connected to the side of the stage 200 with the detection port 220 via the second connector. The combined clamp includes a second clamping plate 340 and a third clamping plate 350 arranged opposite to each other. The second clamping plate 340 and the third clamping plate 350 clamp and fix the film layer to be tested along the thickness direction, and the film layer to be tested located between the second clamping plate 340 and the third clamping plate 350 corresponds to the position of the detection port 220. It can be understood that the second clamping plate 340 and the third clamping plate 350 are provided with a clamping drive to clamp and fix the second clamping plate 340 and the third clamping plate 350. For example, the clamping drive can be a mechanically driven drive, such as a cylinder.

[0050] This application does not specify the structure of the second connector, as long as it can allow the combined clamp to be detachably connected to the shelf 200. Multiple second connectors are permitted. For example, the second connector can be a clip or a pressing component, such as pressing the second clamping plate 340 onto the shelf 200. The second connector can have the same structure as the first connector 320.

[0051] like Figure 5As shown, the second fixture also includes a plurality of second seals 370. The second seals 370 are disposed at the edge between the second clamping plate 340 and the third clamping plate 350, for sealing a set of opposing sides of the film layer to be tested. Optionally, the shape and size of the detection port 220 are the same as the shape and size of the exposed area of ​​the film layer to be tested.

[0052] Understandably, if the test area shapes differ when testing the permeability of the membrane layer in the thickness direction and perpendicular to the thickness direction, two different shaped test ports 220 can be provided on the stage 200 to meet the needs of the two different shapes. When using one test port 220 for testing, the other test port 220 can be sealed. Alternatively, two stages 200 with different test ports 220 can be provided for separate testing; similarly, two spaced cavities 210 can be formed on the same stage 200, with air inlets 230 and air outlets 240 respectively provided on the cavities 210, allowing for selection and connection according to usage requirements.

[0053] It should be noted that in this application, the second clamping plate 340 and the third clamping plate 350 are arranged perpendicular to the surface of the stage 200, thereby clamping and fixing the membrane layer to be tested, exposing the side surface of the membrane layer to be tested. Furthermore, the second sealing member 370 is used to seal a set of oppositely arranged side surfaces of the membrane layer to be tested. That is, only one set of oppositely arranged side surfaces of the membrane layer to be tested are exposed. In other words, gas can only enter from the exposed side and then exit from the side opposite it.

[0054] In some embodiments, such as Figure 4 As shown, the second retainer also includes a plurality of third seals 360. The third seals 360 are respectively disposed on the side of the second clamping plate 340 near the shelf 200 and the side of the third clamping plate 350 near the shelf 200, so as to seal the space between the second clamping plate 340 and the shelf 200, and the space between the third clamping plate 350 and the shelf 200, respectively.

[0055] This application does not specify the structure and form of the second seal 370 and the third seal 360, as long as they can achieve the sealing effect. For example, the second seal 370 and the third seal 360 can each be a sealing strip.

[0056] In some embodiments, the air permeability testing apparatus further includes a heater 600 disposed within the housing 100. The heater 600 is used to regulate the temperature within the housing 100. For example, the heater 600 may be a resistance wire heater 600.

[0057] In some embodiments, the air permeability testing apparatus further includes a water vapor generator 700 connected to the housing 100. The water vapor generator 700 is used to regulate the humidity inside the housing 100. For example, the water vapor generator 700 includes a water tank, and the water in the water tank can be vaporized by means of heating or ultrasound.

[0058] In some embodiments, the permeability testing apparatus further includes a gas regulator 800 connected to the housing 100. The gas regulator 800 is used to regulate the gas composition within the housing 100. For example, the gas regulator 800 may be a gas generator capable of producing a specific gas or a gas cylinder with a specific composition, thereby regulating the gas composition within the housing 100.

[0059] In some embodiments, the detector 500 includes at least one of a water vapor concentration detector and an oxygen concentration detector. Furthermore, when different gases need to be detected, sensors corresponding to those gases may be added.

[0060] In some embodiments, the air permeability testing device further includes a gas source 400. The gas source 400 is connected to the air inlet 230 and is used to introduce purge gas into the cavity 210. The gas source 400 can be a nitrogen gas source. For example, a nitrogen cylinder can be used as the nitrogen gas source. The gas source 400 can be located inside or outside the housing 100. When the gas source 400 is located outside the housing 100, it can be integrated with the detector 500 in the same device.

[0061] In some embodiments, the surface of the stage 200 is covered with a heat insulation layer. Optionally, the heat insulation layer may be formed of a heat insulation material or a heat insulation structure. For example, the heat insulation material may be heat insulation ceramic, and the heat insulation structure may be a heat insulation sealed cavity, thereby improving the heat insulation capability of the stage 200 and further avoiding the influence of gas temperature changes on the test results.

[0062] In some embodiments, the air permeability testing device further includes a first air pressure sensor 900. The first air pressure sensor 900 is disposed inside the housing 100 and is used to detect the air pressure inside the housing 100.

[0063] In some embodiments, the air permeability testing device further includes a second air pressure sensor (not shown in the figure). The second air pressure sensor is disposed on the stage 200 and is used to detect the air pressure in the cavity 210.

[0064] Exemplarily, a testing method for the above-mentioned air permeability testing device is provided, comprising the following steps:

[0065] S1. Place the membrane layer to be tested on the stage 200, and use the first clamping plate 310 to press and fix the membrane layer to be tested on the stage 200. At the same time, the opening 311 on the first clamping plate 310 corresponds to the position of the detection port 220. Optionally, the edge of the first clamping plate 310 is sealed by the first sealing member 330.

[0066] S2. Nitrogen gas is purged into the cavity 210 of the stage 200 using the gas source 400. Once the detector 500 shows no change in its readings (i.e., no other impurities in the cavity 210 and pipeline), the stage 200 with the membrane layer to be tested is placed inside the chamber 100, whose internal environment has been regulated. After a period of testing, the air permeability is calculated based on the concentration data obtained from the detector 500. Taking the use of an infrared sensor to detect and calculate the water permeability (the mass of water vapor passing through a unit area per unit time) as an example, the calculation method includes the following formula:

[0067]

[0068]

[0069]

[0070] Wherein, W: permeability (g / m³) 2 / day); C: Water vapor concentration (mol / m³) 3 Q: Molar flow rate of water vapor (mol / m³) 3 / day); t: Test time (day); M: Molar mass of water (g / mol); d: Sample thickness (m). I0: Initial infrared intensity; I: Infrared intensity during test; ε: Molar absorption coefficient (empirical constant); V: Sample transmission volume (m³ / day). 3 ( ) refers to the volume of the exposed part of the sample during the air permeability test.

[0071] S3. After the test is completed, remove the clamping of the first clamping plate 310 and the stage 200, and remove the film layer to be tested.

[0072] S4. The two sides of the film layer to be tested are clamped by the second clamping plate 340 and the third clamping plate 350, and a set of opposite sides of the film layer to be tested are sealed by the second sealing member 370, leaving only the set of sides to be tested exposed. The exposed side of the film layer to be tested is fixed facing the stage 200, and the connection between the second clamping plate 340 and the third clamping plate 350 and the stage 200 is sealed by the third sealing member 360.

[0073] S5. Nitrogen gas is introduced into the cavity 210 using the gas source 400. When the detector 500 shows no change in the detection result, that is, there are no other impurity gases in the cavity 210 and the pipeline, the stage 200 with the membrane layer to be tested is placed into the chamber 100 with the environmental parameters adjusted in advance for testing.

[0074] The embodiments of this application will be described in detail below with reference to examples. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. For experimental methods in the following embodiments where specific conditions are not specified, please refer to the guidelines given in this application, or follow experimental manuals or conventional conditions in the art, or follow the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

[0075] Example 1

[0076] Prepare an EVA film layer (ethylene-vinyl acetate copolymer) and an EPE film layer (EVA-POE-EVA laminate structure) with dimensions of 10cm×10cm×0.056cm (length×width×thickness), an aluminum foil tape with dimensions of 10cm×10cm×0.009cm (length×width×thickness), and a PET (polyethylene terephthalate) backing plate with dimensions of 10cm×10cm×0.035cm (length×width×thickness). Using the air permeability testing device of this application, test the water permeability of the above samples in the thickness direction at 40℃, 65℃, and 85℃ according to the above method. The humidity in chamber 100 was set to 85%. The test results are shown in Table 1.

[0077] Table 1

[0078]

[0079] The water permeability of EVA, EPE and aluminum foil tape in the direction perpendicular to the thickness was then tested separately, and the test results are shown in Table 2.

[0080] Table 2

[0081]

[0082] As can be seen from Tables 1 and 2 above, the water permeability test in the thickness direction in Table 1 shows that the water permeability of the aluminum foil tape is extremely low, suggesting that its sealing reliability is high. However, in the actual damp heat test of photovoltaic modules, it was found that photovoltaic module failure occurred. As can be seen from Table 2, the adhesive layer in the aluminum foil tape uses acrylic material, which has high water permeability in the direction perpendicular to the thickness.

[0083] Example 2

[0084] A test membrane layer with dimensions of 10cm × 10cm × 0.056cm was prepared. The test membrane layers were made of three different commercially available EPE films, designated EPE-1, EPE-2, and EPE-3. Using the air permeability testing device described in this application, the water permeability in the thickness direction and perpendicular to the thickness direction was tested at 85°C according to the method described above. The humidity in chamber 100 was set to 85%. The test results are shown in Table 3. Using the three EPE materials mentioned above, a 210-66 module (cell size 210mm×105mm, a total of 132 cells, using half-cell technology, equivalent to 66 full 210mm×210mm cells, referred to as the 210-66 module) was assembled. The module size was 2384mm×1384mm×30mm. The photovoltaic module was subjected to a damp heat test, i.e., temperature 85±2℃, relative humidity 85%±5℃, test time 1000 hours, to test the power degradation of the photovoltaic module. The test results are shown in Table 3.

[0085] Table 3

[0086]

[0087] As can be seen from Table 3, although the vertical water permeability of the three EPE films is similar, after the modules were made, it was found that there were significant differences in the power decay of the photovoltaic modules in the DH1000 damp heat test. Combined with the water permeability, it can be seen that the POE layer in the EPE-2 film delaminated from the EVA during the damp heat aging process, resulting in a larger power decay. This further illustrates that the water permeability testing device of this application can accurately test the air permeability of the film layer.

[0088] In summary, this application uses a fixture 300 to fix the membrane layer under test onto a stage 200 with a cavity 210. The ambient gas in the chamber 100 simulates the working environment. The ambient gas enters the cavity 210 through the detection port 220 from the membrane layer under test. The cavity 210 is then purged by a gas source 400, delivering the gas that has permeated the membrane layer to the detector 500 for detection. This application uses a gas source 400 to purge the gas from the membrane layer under test to the detector 500, avoiding the problem of being easily affected by environmental parameters when directly testing inside the chamber 100. This enables permeability testing under different environmental conditions and improves the accuracy of the results.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0090] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An air permeability testing device, characterized in that, The air permeability testing device includes: Box (100); A storage platform (200) is provided inside the housing (100). The storage platform (200) has a cavity (210) inside. The storage platform (200) is also provided with a detection port (220), an air inlet (230) and an air outlet (240) communicating with the cavity (210). A fixture (300), detachably connected to the stage (200), is used to cooperate with the stage (200) to fix and seal the edge region of the film layer to be tested; and, A detector (500) is disposed outside the housing (100) and connected to the vent (240) for detecting the concentration of gas discharged from the cavity (210).

2. The air permeability testing device as described in claim 1, characterized in that, The fixture (300) includes a first fixture and a second fixture, both detachably connected to the platform (200). The first fixture is used to fix the film layer to be tested in a direction parallel to the plane of the platform (200); the second fixture is used to fix the film layer to be tested in a direction perpendicular to the plane of the platform (200).

3. The air permeability testing device as described in claim 2, characterized in that, The first fixture includes a first clamping plate (310) and a first connector (320). The first clamping plate (310) has an opening (311). The first clamping plate (310) is detachably connected to the side of the platform (200) with the detection port (220) through the first connector (320). The opening (311) corresponds to the position of the detection port (220) so that the first clamping plate (310) and the platform (200) clamp and fix the film layer to be tested.

4. The air permeability testing device as described in claim 3, characterized in that, The first fixture also includes a first seal (330), which is disposed on the edge of the first clamp (310) and is used to seal the gap between the first clamp (310) and the shelf (200).

5. The air permeability testing device as described in claim 2, characterized in that, The second fixture includes a combination clamp and a second connector. The combination clamp is detachably connected to the side of the platform (200) with the detection port (220) via the second connector. The combination clamp includes a second clamping plate (340) and a third clamping plate (350) arranged opposite to each other. The second clamping plate (340) and the third clamping plate (350) clamp and fix the film layer to be tested along the thickness direction, and the film layer to be tested located between the second clamping plate (340) and the third clamping plate (350) corresponds to the position of the detection port (220). The second fixture also includes a plurality of second seals (370), which are disposed at the edges between the second clamping plate (340) and the third clamping plate (350) for sealing a set of oppositely arranged sides of the film layer to be tested.

6. The air permeability testing device as described in claim 5, characterized in that, The second fixture also includes a plurality of third seals (360), which are respectively disposed on the side of the second clamping plate (340) near the table (200) and the side of the third clamping plate (350) near the table (200) to seal the space between the second clamping plate (340) and the table (200) and the space between the third clamping plate (350) and the table (200).

7. The air permeability testing device according to any one of claims 1-6, characterized in that, The air permeability testing device further includes a heater (600) disposed within the housing (100), the heater (600) being used to regulate the temperature within the housing (100); and / or, The air permeability testing device further includes a water vapor generator (700) connected to the housing (100), the water vapor generator (700) being used to regulate the humidity inside the housing (100); and / or, The air permeability testing device also includes a gas regulator (800) connected to the housing (100), the gas regulator (800) being used to adjust the gas composition inside the housing (100).

8. The air permeability testing device as described in claim 1, characterized in that, The detector (500) includes at least one of a water vapor concentration detector and an oxygen concentration detector; and / or, The air permeability testing device also includes an air source (400), which is connected to the air inlet (230) and is used to introduce purge gas into the cavity (210).

9. The air permeability testing device according to any one of claims 1-6 and 8, characterized in that, The surface of the shelf (200) is covered with a heat insulation layer.

10. The air permeability testing device according to any one of claims 1-6 and 8, characterized in that, The air permeability testing device also includes a first air pressure sensor (900), which is disposed inside the housing (100) and is used to detect the air pressure inside the housing (100); And / or, The air permeability testing device also includes a second air pressure sensor, which is disposed on the platform (200) and is used to detect the air pressure in the cavity (210).

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