Visual coating isolating membrane porosity testing method and system

Abstract

The invention discloses a visual coating isolating membrane porosity testing method and system, and relates to the technical field of porosity testing. The method comprises the steps that a flat plate is horizontally placed on a rotating platform, a circular contour line is drawn on the flat plate, a coating isolating membrane is placed on the flat plate, and the coating isolating membrane is located in the circular contour line; preparing an indicator, in the rotating process of the flat plate, dropwise adding the indicator on the coating isolating membrane according to a set rate until the indicator reaches the circular contour line, detecting the color of the position where the indicator reaches the circular contour line in real time by using a visual detection network, and determining the stopping time of dropwise adding the indicator; and calculating the porosity of the coating isolating membrane according to the consumed mass of the indicator. According to the method disclosed by the invention, a visual porosity testing experiment is realized by a method of dropwise adding an indicator, and a result point is accurately identified by combining a computer vision technology, so that a relatively large random error is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of porosity testing, and in particular to a visual coating isolation film porosity testing method and system. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The main components of a lithium-ion battery include positive and negative electrode materials, electrolyte, separator, and battery casing. The separator is a crucial component of a lithium-ion battery, serving as the interface between the positive and negative electrodes. Its primary function is to isolate the positive and negative electrodes to prevent short circuits while ensuring the proper flow of lithium ions through microporous channels during charge and discharge, ensuring proper battery operation. Its performance directly impacts battery capacity, rate capability, lifespan, and safety. To ensure structural and functional integrity, and considering the requirements of lithium battery production and manufacturing, separators must possess properties such as electronic insulation, chemical stability, thermal stability, and an appropriate porosity.

[0004] Porosity not only affects the permeability of the separator and the electrolyte capacity it can hold, but also its ion permeability, thereby affecting the battery's internal resistance and power density. Higher porosity provides more ion transport channels, reducing the battery's internal resistance and improving its charge and discharge efficiency. Excessively high porosity can lead to excessive electrolyte absorption and increase the risk of battery swelling, while too low a porosity can hinder ion transport and affect battery performance. Therefore, the separator's porosity needs to be controlled within a certain range to ensure battery safety and performance.

[0005] The industry typically uses a gravimetric method to test the porosity of separator base films. The porosity is calculated based on the density of the membrane material and the apparent density of the membrane. Specifically, a certain area of the membrane is cut, its thickness is measured, and the volume is obtained. The membrane density is then weighed to calculate the membrane density. This method requires the density of the membrane material, making it suitable for separator base films. However, the density of coated separators is difficult to measure, limiting its applicability. Currently, two methods for testing the porosity of coated separators are mercury intrusion porosimetry and liquid immersion porosimetry. Mercury is toxic, making the mercury intrusion porosity test costly and environmentally unfriendly. The liquid immersion method, on the other hand, suffers from significant random errors, primarily due to inconsistent results. To reduce costs, some studies have used water as a medium in conjunction with a lithium battery separator porosity analyzer. However, water has limitations in its ability to penetrate materials. Without applied pressure, water cannot fully penetrate the pores of the separator, requiring instrumentation, which limits its application. Furthermore, existing porosity testing processes are not visually accessible, making the test difficult to perform intuitively.

[0006] In summary, how to efficiently realize the visual and accurate testing of the porosity of the coating isolation membrane has become a technical problem that needs to be solved urgently in the existing technology. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a visual coating isolation membrane porosity testing method and system, set the contour boundary line, and realize the visual porosity testing experiment through the indicator dripping method, and combine computer vision technology to accurately identify the result points to prevent large random errors.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions: A first aspect of the present invention provides a visual method for testing the porosity of a coating isolation film, comprising the following steps: A flat plate is placed horizontally on a rotating platform, a circular outline is drawn on the flat plate, and a coating isolation film is placed on the flat plate, with the coating isolation film being located within the circular outline; An indicator is provided, and while the plate is rotating, the indicator is dripped onto the coating isolation film drop by drop at a set rate until the indicator reaches the circular outline, wherein the color of the indicator at the circular outline is detected in real time using a visual detection network to determine the time to stop dripping the indicator; The porosity of the coating isolation membrane is calculated based on the consumed mass of the indicator.

[0009] Furthermore, the indicator is a methyl red alcohol indicator, and the preparation method is to weigh 0.1g-0.15g of methyl red, dissolve it in an alcohol solution and dilute it to 100ml to obtain the methyl red alcohol indicator.

[0010] Furthermore, the coated isolation film is cut into a circular shape with a diameter of 10 cm to 15 cm.

[0011] Furthermore, the coating isolation film overlaps with the center of the circular outline, and the diameter of the circular outline is 1 cm larger than the circular outline.

[0012] Furthermore, the rotation speed of the rotating platform is 100 rpm / min-200 rpm / min.

[0013] Furthermore, the indicator droplet addition rate is 10 to 15 drops per minute.

[0014] Furthermore, the experimental process was carried out in a drying room.

[0015] Furthermore, the specific steps of using the visual detection network to detect the color of the indicator reaching the circular contour line in real time are as follows: Acquire RGB images and spectral image sequences of the plate during the dropping process; Preprocess RGB images and spectral image sequences; The visual detection network is used to perform color recognition and detection on circular contours of RGB images and spectral image sequences.

[0016] Furthermore, the specific steps of using the visual detection network to perform color recognition detection on the circular contour lines of the RGB image and spectral image sequence are as follows: The multimodal fusion module is used to fuse the RGB image and the spectral image sequence to obtain the fusion feature; Encode the fused features, and use the channel attention module and the spatial attention module to extract the fused features in turn to obtain the feature map; The feature map is decoded and classified to obtain the color recognition detection result.

[0017] The second aspect of the present invention provides a testing system for the visual coating isolation film porosity testing method according to the first aspect, comprising: A flat plate for carrying the coating isolation film; The rotating platform includes a base and a platform. The base is used to support the platform. A flat plate is placed on the platform and can adjust the rotation speed.

[0018] One or more of the above technical solutions have the following beneficial effects: The present invention discloses a visual coating isolation membrane porosity test method and system, which overcomes the defects of the prior art and realizes efficient, accurate and visual testing of the coating isolation membrane porosity. The use of a rotating platform can effectively disperse the methyl red indicator evenly on the isolation membrane, which is not easy to cause liquid accumulation. On the other hand, it can reduce the experimental time and improve efficiency. The methyl red alcohol indicator uses a very small amount of methyl red dissolved in an n-butanol solution. It does not affect the wetting performance of n-butanol and can also serve as a visual experimental endpoint to determine whether the experiment is over. The entire experiment is completed in a drying room, which greatly slows down the volatilization rate of n-butanol, so that the accuracy of the test results is further guaranteed. The visual detection network can accurately detect the color of the indicator at the circular contour line in real time, accurately determine the drop-addition stop time, and thus accurately calculate the porosity of the coating isolation membrane, avoiding the errors caused by human judgment or insufficient instrument assistance in traditional methods, and greatly improving the accuracy of the test results. The present invention provides a simple and visual method for testing the porosity of coating isolation membranes. The method is simple and feasible to operate, and the test results are accurate. It is of great significance for the quality control and performance optimization of coating isolation membranes in the production process of lithium batteries, and has broad application prospects.

[0019] The existing porosity testing process is invisible, making it difficult to visually observe the test results. The present invention creates a circular outline on a flat plate, places a coating isolation membrane within it, and drips the indicator onto a rotating platform, making the entire testing process clearly visible. Operators can visually observe the diffusion of the indicator on the coating isolation membrane and the moment it reaches the outline, facilitating timely detection of anomalies and adjustments. This enhances the controllability of the testing process and provides a more intuitive basis for subsequent experimental analysis and research.

[0020] The present invention drips the indicator dropwise at a set rate as the plate rotates. Both the rotational speed of the rotating platform and the indicator dripping rate can be precisely controlled according to actual needs, allowing the indicator to diffuse evenly and quickly throughout the coating separator, significantly shortening the testing time. Furthermore, the real-time monitoring capabilities of the visual inspection network reduce human intervention and waiting time, further improving testing efficiency and enabling rapid and accurate porosity test results, meeting the demand for rapid porosity testing of coating separators during lithium battery manufacturing.

[0021] Mercury intrusion porosimetry is expensive and environmentally friendly due to the use of mercury. The methyl red alcohol indicator used in the present invention is low in cost, and the entire test system does not need to use toxic and hazardous substances such as mercury, which reduces the test cost while also meeting environmental requirements. In addition, the test method of the present invention is easy to operate, does not require complex instruments and equipment and complicated steps, reduces the investment of labor cost and equipment cost, and has higher economy and practicality.

[0022] The testing process of the present invention is performed in a dry room, effectively preventing the influence of external environmental humidity and other factors on the test results, ensuring test stability. Furthermore, the present invention optimizes the cutting shape and size of the coated separator, making it easier to operate and control. It also has good adaptability to coated separators of different specifications and can be widely used to test the porosity of various types of lithium battery coated separators, demonstrating strong versatility and flexibility.

[0023] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1Schematic diagram of a flat plate with a coating isolation film placed thereon in the present invention. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations; The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] The present invention provides a visual method for testing the porosity of a coating isolation film, comprising the following steps: Step 1: Place a flat plate horizontally on a rotating platform with a circular outline drawn on it. Place the coated isolation film on the flat plate so that the coated isolation film is located within the circular outline.

[0029] The flat plate of the present invention can be a glass plate or other transparent materials. Figure 1 As shown, a coated isolation membrane is placed on a flat plate. The membrane is cut into a circular shape with a diameter of 10-15 cm. The membrane overlaps the center of the circular outline, and the circular outline diameter is 1 cm larger than the circular outline. Because the indicator solution cannot be evenly soaked in all pores when it diffuses to the membrane boundary, a tolerance interval is required. Experiments have determined that a tolerance interval of 1 cm is most suitable.

[0030] Step 2: Prepare the indicator. While the plate is rotating, add the indicator dropwise onto the coating isolation film at a set rate until the indicator reaches the circular outline.

[0031] Step 2.1: Prepare the indicator.

[0032] In the present invention, the indicator is a methyl red alcohol indicator, and the preparation method is to weigh 0.1g-0.15g of methyl red, dissolve it in an alcohol solution and dilute it to 100ml to obtain the methyl red alcohol indicator.

[0033] It should be noted that the methyl red alcohol indicator diffuses evenly on the coating isolation film and has a color indication function. Other indicators with indication functions and even diffusion can also be used for the experiment.

[0034] Step 2.2: Add the indicator dropwise onto the coating isolation film at a set rate until the indicator reaches the circular outline.

[0035] In the present invention, the rotating platform is set to a speed of 100-200 rpm / min. The indicator is added at a rate of 10-15 drops per minute. The entire experimental process is performed in a dry room. The separator should be a smooth, wrinkle-free coated separator fixed to a flat plate.

[0036] Step 2.3: Use the visual inspection network to detect the color of the indicator when it reaches the circular contour line in real time to determine the time to stop adding the indicator.

[0037] Step 2.3.1: Acquire RGB images and spectral image sequences of the plate during the addition process.

[0038] Color variations can be identified not only through RGB images but also through spectral information, enhancing recognition capabilities. Multispectral cameras can be used to capture RGB images, while high-definition cameras can be used to capture spectral images. These cameras capture richer spectral information, helping to distinguish subtle color variations. The present invention captures image sequences at a high frequency (e.g., 10 frames per second).

[0039] Step 2.3.2: Preprocess the RGB image and spectral image sequences.

[0040] The present invention performs cleaning and normalization processing on RGB images and spectral image sequences.

[0041] Step 2.3.3: Use the visual detection network to perform color recognition and detection on the circular contour lines of the RGB image and spectral image sequence.

[0042] First, we build a visual detection network, which includes a multimodal fusion module, a channel attention module, a spatial attention module, and a color recognition module.

[0043] Secondly, the visual detection network is trained. In the present invention, existing labeled data is used to form a data set, and the image in which the indicator reaches the contour line and reaches the optimal end time of dripping is marked. The data set is preprocessed by data enhancement, and the robustness of the model to color changes can be improved by data enhancement. In the data preprocessing stage, in addition to conventional operations such as rotation, flipping, and cropping, the present invention adds color dithering processing, that is, randomly adjusting the brightness, contrast, saturation, etc., to enhance the adaptability of the model to color changes. The data set is divided into a training set and a test set, and the visual detection network is trained. Dice Loss or cross entropy loss is used for boundary detection, and binary cross entropy loss is used for boundary color recognition. The Adam optimizer is used, and the learning rate is set to 0.001.

[0044] The training process includes: Initialize the visual detection network parameters.

[0045] The output results of boundary detection and boundary color recognition are calculated through forward propagation.

[0046] Calculate the loss function and update the parameters through backpropagation.

[0047] Evaluate model performance on the test set and save the best model.

[0048] Then, the trained visual detection network is used to perform color recognition and detection on the circular contour lines of the real-time collected RGB images and spectral image sequences.

[0049] The specific data processing steps are as follows: Step 2.3.3.1: Use the multimodal fusion module to fuse the RGB image and spectral image sequence to obtain the fusion feature.

[0050] The RGB image and spectral image are taken as input, and the convolutional long short-term memory network (ConvLSTM) is used to process the time series information in the image to enhance the perception of color changes. The RGB image and spectral image are then channel-joined to form a 5-channel input image, and the fusion feature is output.

[0051] Step 2.3.3.2: Encode the fused features and use the channel attention module and spatial attention module to extract the fused features in turn to obtain the feature map.

[0052] In one specific embodiment, the encoder includes three convolutional layers and two max pooling layers. The fused features pass through a convolutional layer, a max pooling layer, a convolutional layer, a max pooling layer, and a convolutional layer, respectively. The three convolutional layers are used to extract low-level features, further features, and high-level features, respectively. The pooling layer is used to reduce spatial resolution and reduce computational complexity. After passing through the encoder, the features are further extracted and input into the channel attention module and the spatial attention module. The channel attention module can enhance the network's focus on important channels, thereby improving sensitivity to changes in color depth. Specifically, a Squeeze-and-Excitation (SE) module is added after the last convolutional layer in the encoder to weight channels. These modules learn inter-channel dependencies and dynamically adjust channel weights to enhance focus on important channels. The spatial attention mechanism can enhance the network's focus on important areas, thereby improving local perception of color changes. Specifically, a Convolutional Block Attention Module (CBAM) is added after the channel attention module to weight spatial locations. These modules learn the dependencies of spatial positions and dynamically adjust the weights of spatial positions to enhance attention to important areas.

[0053] Step 2.3.3.3: Decode and classify the feature map to obtain the color recognition detection result.

[0054] In a specific embodiment, the decoder part includes two upsampling layers, two convolutional layers and an output layer. The upsampling layer is used to gradually restore the spatial resolution of the feature map through the transposed convolution layer. The convolution layer is connected after the upsampling layer for further feature processing to refine the feature map. Finally, the output layer generates the final boundary detection map, uses a 1x1 convolution kernel to map the feature map to a single-channel boundary map, and uses a Sigmoid activation function to normalize the pixel value to the range of [0, 1]. The color recognition module is used to classify and identify the feature map to determine whether the optimal end time of dripping has been reached. It includes a fully connected layer and an output layer, and finally the output layer outputs the final binary classification result, indicating whether the optimal end time of dripping has been reached.

[0055] The above-mentioned visual detection network can effectively fuse multimodal information, use the attention mechanism to enhance the focus on important features, and partially restore the resolution of the image through the decoder, ultimately achieving accurate recognition of color depth changes.

[0056] When it is detected that the indicator has reached the circular outline and the optimal color is detected, the addition of the indicator is stopped and the mass of the methyl red alcohol solution used is recorded.

[0057] Step 3: Calculate the porosity of the coating isolation membrane based on the consumed mass of the indicator.

[0058] The calculation formula is: .

[0059] Where P is the porosity, W is the mass of methyl red alcohol solution, V is the apparent volume of the membrane, and d is the density of alcohol.

[0060] .

[0061] Where r is the radius of the isolation membrane and h is the thickness of the isolation membrane.

[0062] The present invention also provides a test system for a visual test method of the porosity of a coating isolation film, comprising: A flat plate for carrying the coating isolation film; The rotating platform includes a base and a platform. The base is used to support the platform. A flat plate is placed on the platform and can adjust the rotation speed.

[0063] A motor is also included for driving the rotating platform to rotate.

[0064] The present invention also discloses the following examples and comparative examples for determining the optimal test parameters: Example 1 Prepare the methyl red alcohol indicator: Weigh 0.1g of methyl red, dissolve it in n-butanol solution, and dilute to 100ml to obtain the methyl red alcohol indicator. Select a flat, wrinkle-free release film and cut it into a 15cm diameter circle. Place the coated release film on a glass plate with a 16cm diameter circular outline drawn on the plate. Place the bottom of the glass plate on a rotating platform and rotate it at 150rpm. Use a dropper to add the methyl red alcohol indicator dropwise onto the coated release film at 10 drops per minute until the red solution overflows to the edge of the circular outline. Perform the entire experiment in a dry room.

[0065] Example 2 Prepare the methyl red alcohol indicator: Weigh 0.1g of methyl red, dissolve it in n-butanol solution, and dilute to 100ml to obtain the methyl red alcohol indicator. Select a flat, wrinkle-free release film and cut it into a 15cm diameter circle. Place the coated release film on a glass plate with an 11cm diameter circular outline drawn on it. Place the bottom of the glass plate on a rotating platform and rotate it at 200rpm. Use a dropper to add the methyl red alcohol indicator dropwise onto the coated release film at 10 drops per minute until the red solution overflows to the edge of the circular outline. Perform the entire experiment in a dry room.

[0066] Example 3 Prepare the methyl red alcohol indicator: Weigh 0.1g of methyl red, dissolve it in n-butanol solution, and dilute to 100ml to obtain the methyl red alcohol indicator. Select a flat, wrinkle-free release film and cut it into a 15cm diameter circle. Place the coated release film on a glass plate with an 11cm diameter circular outline drawn on it. Place the bottom of the glass plate on a rotating platform and rotate it at 100rpm. Use a dropper to add the methyl red alcohol indicator dropwise onto the coated release film at a rate of 10 drops per minute until the red solution overflows to the edge of the circular outline. Perform the entire experiment in a dry room.

[0067] Example 4 Prepare the methyl red alcohol indicator: Weigh 0.1g of methyl red, dissolve it in n-butanol solution, and dilute to 100ml to obtain the methyl red alcohol indicator. Select a flat, wrinkle-free release film and cut it into a 10cm diameter circle. Place the coated release film on a glass plate with an 11cm diameter circular outline drawn on it. Place the bottom of the glass plate on a rotating platform and rotate it at 200rpm. Use a dropper to add the methyl red alcohol indicator dropwise onto the coated release film at 15 drops per minute until the red solution overflows to the edge of the circular outline. Perform the entire experiment in a dry room.

[0068] Comparative Example 1 Select a flat, wrinkle-free release film and cut it into a 15cm diameter circle. Place the coated release film on a glass plate with a 16cm diameter circular outline drawn on the plate. Place the bottom of the glass plate on a rotating platform and rotate it at 150 rpm. Use a dropper to add n-butanol dropwise to the coated release film at a rate of 10 drops per minute until the n-butanol solution overflows to the boundary of the circular outline. The entire experiment was conducted in a dry room.

[0069] Comparative Example 2 Prepare the methyl red alcohol indicator: Weigh 0.1g of methyl red and dissolve it in n-butanol solution, diluting it to 100ml. Select a flat, wrinkle-free release film and cut it into a 15cm diameter circle. Place the coated release film on a glass plate and draw a 16cm diameter circular outline on the glass plate. Use a dropper to add the methyl red alcohol indicator dropwise onto the coated release film at a rate of 10 drops per minute until the red solution overflows to the edge of the circular outline. Perform the entire experiment in a dry room.

[0070] Comparative Example 3 Prepare the methyl red alcohol indicator: Weigh 0.1g of methyl red and dissolve it in n-butanol solution, diluting it to 100ml. Select a flat, wrinkle-free release film and cut it into a 15cm diameter circle. Place the coated release film on a glass plate. Draw a 16cm diameter circular outline on the glass plate. Place the bottom of the glass plate on a rotating platform and rotate it at 150rpm. Use a dropper to add the methyl red alcohol indicator dropwise onto the coated release film at 10 drops per minute until the red solution overflows to the edge of the circular outline.

[0071] Table 1 Comparison of results of the embodiment and comparative example (density of n-butanol used in the calculation is 0.8 g / ml)

[0072] As shown in Table 1, the porosity value measured in Example 1 is closest to the theoretical value, and the relative deviation is kept within 5% (relative deviation = (calculated porosity value - theoretical porosity value) / theoretical porosity value). 100%). The porosity value in Example 2 deviates significantly from the theoretical value compared to Example 1. This is due to the high rotational speed of the rotating platform, which prevents the isolation membrane from being fully soaked. The methyl red alcohol indicator has already reached the boundary of the circular contour under the high-speed centrifugal action of the rotating platform. The porosity value in Example 3 deviates significantly from the theoretical value compared to Example 1. This may be due to the slow rotational speed, which results in a slow liquid infiltration rate. The calculated value in Example 4 is slightly lower, which may be due to the small area of the isolation membrane. The liquid infiltration is very rapid at the platform speed, which easily causes liquid overflow and a large random error.

[0073] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any technical object of a person skilled in the art that can be easily conceived of within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A visual method for testing the porosity of a coating isolation film, characterized in that: The following steps are involved: A flat plate is placed horizontally on a rotating platform, a circular outline is drawn on the flat plate, and a coating isolation film is placed on the flat plate, with the coating isolation film being located within the circular outline; An indicator is provided, and while the plate is rotating, the indicator is dripped onto the coating isolation film drop by drop at a set rate until the indicator reaches the circular outline, wherein the color of the indicator at the circular outline is detected in real time using a visual detection network to determine the time to stop dripping the indicator; The porosity of the coating isolation membrane is calculated based on the consumed mass of the indicator.

2. The visual coating isolation film porosity testing method according to claim 1, characterized in that: The indicator is methyl red alcohol indicator. The preparation method is to weigh 0.1g-0.15g of methyl red, dissolve it in alcohol solution and dilute it to 100ml to obtain methyl red alcohol indicator.

3. The visual coating isolation film porosity testing method according to claim 1, characterized in that: The coated isolation film is cut into a circle with a diameter of 10cm-15cm.

4. The visual coating isolation film porosity testing method according to claim 3, characterized in that: The coating isolation film overlaps with the center of the circular outline, and the diameter of the circular outline is 1 cm larger than the circular outline.

5. The visual coating isolation film porosity testing method according to claim 1, wherein: The rotation speed of the rotating platform is 100 rpm / min-200 rpm / min.

6. The visual coating isolation film porosity testing method according to claim 1, characterized in that: The indicator drop rate is 10 to 15 drops per minute.

7. The visual coating isolation film porosity testing method according to claim 1, characterized in that: The experimental process was carried out in a drying room.

8. The visual coating isolation film porosity testing method according to claim 1, wherein: The specific steps of using the visual inspection network to detect the color of the indicator when it reaches the circular contour line in real time are as follows: Acquire RGB images and spectral image sequences of the plate during the dropping process; Preprocess RGB images and spectral image sequences; The visual detection network is used to perform color recognition and detection on circular contours of RGB images and spectral image sequences.

9. The visual coating isolation film porosity testing method according to claim 8, characterized in that: The specific steps of using the visual detection network to perform color recognition and detection on the circular contour lines of RGB images and spectral image sequences are as follows: The multimodal fusion module is used to fuse the RGB image and the spectral image sequence to obtain the fusion feature; Encode the fused features, and use the channel attention module and the spatial attention module to extract the fused features in turn to obtain the feature map; The feature map is decoded and classified to obtain the color recognition detection result.

10. A testing system for the visual coating isolation film porosity testing method according to any one of claims 1 to 9, characterized in that: include: A flat plate for carrying the coating isolation film; The rotating platform includes a base and a platform. The base is used to support the platform. A flat plate is placed on the platform and can adjust the rotation speed.

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