Device and method for rapidly detecting coverage rate of sprayed diaphragm on line

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a device for quickly detecting the coverage rate of a sprayed diaphragm on line, which comprises an image acquisition unit, a lighting unit, an image processing unit, a data transmission unit and a control terminal. According to the device and the method for rapidly detecting the coverage rate of the sprayed diaphragm on line, the coverage rate of the sprayed diaphragm can be rapidly and accurately detected on line, the production efficiency and the product quality are improved, and a reliable quality control means is provided for manufacturing of a lithium ion battery.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a device and method for online rapid detection of spraying diaphragm coverage. Background Art

[0002] As a key component inside the battery, the main function of the diaphragm is to prevent the positive and negative electrodes from directly contacting each other and causing a short circuit, while ensuring the free movement of lithium ions in the electrolyte. The coating layer can significantly improve the thermal stability of the diaphragm and reduce the thermal shrinkage rate, thereby reducing the risk of short circuits caused by contact between the positive and negative electrodes in the event of battery overcharge or thermal runaway. Secondly, the coated diaphragm can extend the cycle life of the battery by increasing the liquid absorption and retention of the diaphragm. The introduction of the coating provides more channels for lithium ion transmission, which is beneficial to the transmission of lithium ions inside the battery, thereby improving the capacity retention performance of the battery.

[0003] In the production process of lithium-ion batteries, the spray coverage of the separator surface has a crucial impact on the battery performance and quality. However, when evaluating the spray coverage of the separator, traditional detection methods, such as using Keyence microscopes, thickness measurement methods, or mass difference methods, usually face problems such as low efficiency, insufficient accuracy, and difficulty in achieving online real-time detection, which limits their application in modern large-scale battery production. Summary of the invention

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a device and method for online rapid detection of spray diaphragm coverage, which can realize online rapid and accurate detection of spray diaphragm coverage, improve production efficiency and product quality, and provide a reliable quality control method for the manufacture of lithium-ion batteries.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, the present invention provides a device for online rapid detection of spray diaphragm coverage, comprising:

[0007] An image acquisition unit, the image acquisition unit is used to acquire an image of the surface of the sprayed diaphragm and generate image data;

[0008] An illumination unit, which is disposed outside the image acquisition unit and is in a ring shape and is used to illuminate the image acquisition unit;

[0009] An image processing unit, the image processing unit is connected to the image acquisition unit, and the image processing unit is used to receive image data from the image acquisition unit, analyze and process the image data, and obtain analysis and processing results;

[0010] A data transmission unit, the data transmission unit is connected to the image acquisition unit and the image processing unit respectively, and is used to transmit image data from the image acquisition unit to the image processing unit;

[0011] A control terminal is connected to the image acquisition unit, the image processing unit and the data transmission unit respectively. The data transmission unit transmits the image data and the analysis and processing results to the control terminal. The control terminal is also used to display the image data and the analysis and processing results.

[0012] Furthermore, the lighting unit adopts a shadowless annular light source.

[0013] Furthermore, the image acquisition unit adopts a high-resolution industrial camera.

[0014] Furthermore, the data transmission unit adopts a high-speed Ethernet transmission mode or a wireless transmission mode.

[0015] Furthermore, the control terminal adopts an industrial computer.

[0016] Furthermore, the control terminal is also used to further analyze and process the image data and analysis and processing results.

[0017] In a second aspect, the present invention provides a method for detecting a device for online rapid detection of spray diaphragm coverage, the method comprising the following steps:

[0018] S1: Turn on the lighting unit and adjust the brightness of the lighting unit, and adjust the position of the lighting unit so that the image acquisition unit is located at the center of the lighting unit;

[0019] S2: using an image acquisition unit to acquire an image of the sprayed diaphragm surface to be acquired, and generating image data;

[0020] S3: the image acquisition unit transmits the image data to the image processing unit via the data transmission unit, and the image processing unit receives the image data and extracts the image data information;

[0021] S4: the image processing unit analyzes and processes the extracted image data information to obtain an analysis and processing result;

[0022] S5: The image processing unit transmits the analysis and processing result to the control terminal via the data transmission unit;

[0023] S6: The control terminal receives the analysis and processing result from the image processing unit and displays the analysis and processing result.

[0024] Furthermore, in step S4, the image processing unit analyzes and processes the image data as follows:

[0025] S41: Processing the image data by using histogram equalization to obtain an equalized processed image;

[0026] S42: Perform edge detection algorithm and threshold segmentation algorithm processing on the equalized processed image to obtain analysis and processing results.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention provides an online rapid detection device and method for the coverage rate of a sprayed diaphragm, which can realize online rapid and accurate detection of the coverage rate of a sprayed diaphragm, improve production efficiency and product quality, and provide a reliable quality control method for the manufacture of lithium-ion batteries.

[0029] 2. In the present invention, a high-resolution industrial camera is used as an image acquisition unit, and a shadowless ring light source is used to ensure image clarity and consistency.

[0030] 3. In the present invention, the image data is first enhanced by histogram equalization, so that the difference between the sprayed area and the unsprayed area on the sprayed diaphragm in the image data is more obvious. This enhancement method provides a clearer basis for subsequent image analysis.

[0031] 4. In the present invention, the image data is processed by combining histogram equalization with an edge detection algorithm and a threshold separation algorithm, so that the sprayed area and the unsprayed area in the image data can be effectively separated, thereby accurately extracting the characteristic information of the sprayed area; specifically, the edge detection algorithm can identify the boundaries of the areas in the equalized processed image, and the threshold separation algorithm divides the image into different areas according to the brightness values ​​of the pixels in the equalized processed image. The combined use of the edge detection algorithm and the threshold separation algorithm greatly improves the accuracy of image analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 It is a structural schematic diagram of a device for online rapid detection of spraying diaphragm coverage provided by the present invention;

[0034] Figure 2 It is a schematic flow chart of a detection method of an apparatus for online rapid detection of spray diaphragm coverage provided by the present invention.

[0035] Among them, the figure markings are: 1. image acquisition unit; 2. lighting unit; 3. image processing unit; 4. data transmission unit; 5. control terminal. DETAILED DESCRIPTION

[0036] 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.

[0037] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] First, as Figure 1 As shown, the present invention provides an online rapid detection device for the coverage rate of a sprayed membrane, comprising an image acquisition unit 1, an illumination unit 2, an image processing unit 3, a data transmission unit 4, and a control terminal 5; the details are as follows:

[0039] The image acquisition unit 1 uses a high-resolution industrial camera. Specifically, the image acquisition unit 1 can use an industrial camera with a resolution of 16-20K pixels to ensure high definition and detail capture of image acquisition. The image acquisition unit 1 is used to acquire images of the surface of the sprayed diaphragm and generate image data;

[0040] The lighting unit 2 is arranged outside the image acquisition unit 1. The lighting unit 2 is annular. Specifically, the lighting unit 2 adopts a shadowless annular light source, and its brightness is adjustable to ensure uniform light distribution on the surface of the sprayed diaphragm, and eliminate shadows and reflections. The lighting unit 2 is used to illuminate the image acquisition unit 1;

[0041] The image processing unit 3 is connected to the image acquisition unit 1. The image processing unit 3 is used to receive the image data from the image acquisition unit 1, analyze and process the image data, and obtain the analysis and processing results. The image processing unit 3 is the core part of the system. It is equipped with a high-performance graphics processing card and dedicated image processing software. The combination of these hardware and software enables the device to quickly process a large amount of image data and realize accurate calculation of the coverage rate of the spray membrane.

[0042] The data transmission unit 4 is connected to the image acquisition unit 1 and the image processing unit 3 respectively, and is used to transmit the image data from the image acquisition unit 1 to the image processing unit 3; wherein the data transmission unit 4 adopts a high-speed Ethernet transmission mode or an infinite transmission mode, which ensures the speed and stability of data transmission and ensures that the image data can be quickly transmitted from the image acquisition unit 1 to the image processing unit 3;

[0043] The control terminal 5 is connected to the image acquisition unit 1, the image processing unit 3 and the data transmission unit 4 respectively. The data transmission unit 4 transmits the image data and the analysis and processing results to the control terminal 5. The control terminal 5 is also used to display the image data and the analysis and processing results. Among them, the control terminal 5 uses an industrial computer, which not only has powerful computing power, but also has stable operating performance, can display the detection results in real time, and provides an intuitive interface for monitoring and management of the production line;

[0044] The control terminal 5 can also be used to further analyze and process the image data and analysis and processing results.

[0045] Second, as Figure 2 As shown, the present invention provides a detection method for an online rapid detection device for spraying diaphragm coverage, the method comprising the following steps:

[0046] S1: Ring Light

[0047] Install the lighting unit 2 above the spray membrane to be collected, adjust the position of the lighting unit 2 so that the image collection unit 1 is located at the center of the lighting unit 2, turn on the lighting unit 2 and adjust the brightness of the lighting unit 2;

[0048] S2: Image acquisition

[0049] The image acquisition unit 1 is used to acquire images of the sprayed diaphragm surface to be acquired, and image data is generated. An industrial camera with a resolution of 16-20K pixels is used to ensure high definition and detail capture capability of image acquisition;

[0050] S3: Image Processing

[0051] The image acquisition unit 1 transmits the image data to the image processing unit 3 via the data transmission unit 4 for processing;

[0052] S4: Extract information

[0053] The image processing unit 3 receives the image data and extracts the image data information;

[0054] S5: Information Analysis

[0055] The image processing unit 3 analyzes and processes the extracted image data information to obtain the analysis and processing results; specifically:

[0056] S51: Processing the image data by using histogram equalization to obtain an equalized processed image;

[0057] S52: Perform edge detection algorithm and threshold segmentation algorithm processing on the equalized image to obtain analysis and processing results;

[0058] The edge detection algorithm is specifically as follows: the edge detection algorithm is used to process the equalized processed image to remove noise in the equalized processed image and extract the contour and boundary information in the equalized processed image;

[0059] The threshold segmentation algorithm is specifically as follows: the equalized processed image processed by the edge detection algorithm is then processed by the threshold segmentation algorithm, specifically by dividing the pixel points of the equalized processed image into target areas and background areas with different gray levels, so that the unsprayed area and the sprayed area on the spray diaphragm can be effectively divided, so that the characteristic information of the sprayed area can be accurately extracted;

[0060] The accuracy of image analysis and processing can be improved by combining edge detection algorithm and threshold segmentation algorithm;

[0061] S6: Data transfer

[0062] The image processing unit 3 transmits the analysis and processing result to the control terminal 5 via the data transmission unit 4;

[0063] S6: Terminal receiving

[0064] The control terminal 5 receives the analysis processing result from the image processing unit 3 and displays the analysis processing result.

[0065] The following are specific examples.

[0066] Example 1

[0067] The present embodiment provides an apparatus for online rapid detection of spray diaphragm coverage, comprising an image acquisition unit 1, an illumination unit 2, an image processing unit 3, a data transmission unit 4, and a control terminal 5; wherein the image acquisition unit 1 is used to acquire an image of the surface of the spray diaphragm and generate image data; the illumination unit 2 is arranged outside the image acquisition unit 1, and the illumination unit 2 is annular and its brightness is adjustable; the image processing unit 3 is connected to the image acquisition unit 1, and the image processing unit 3 is used to receive image data from the image acquisition unit 1, and analyze and process the image data to obtain analysis and processing results; the data transmission unit 4 is connected to the image acquisition unit 1 and the image processing unit 3 respectively, and is used to transmit the image data from the image acquisition unit 1 to the image processing unit 3; the control terminal 5 is connected to the image acquisition unit 1, the image processing unit 3 and the data transmission unit 4 respectively, and the data transmission unit 4 transmits the image data and the analysis and processing results to the control terminal 5, and the control terminal 5 is also used to display the image data and the analysis and processing results, and the control terminal 5 can also be used to further analyze and process the image data and the analysis and processing results.

[0068] Specifically, the image acquisition unit 3 uses an industrial camera with a resolution of up to 16K pixels, ensuring the high definition and detail capture capability of image acquisition. In order to cooperate with high-quality image acquisition, the lighting unit 2 selects a shadowless ring light source with adjustable brightness, which can provide uniform lighting effects, avoid shadows and reflections, and thus improve the recognition accuracy of the image. The image processing unit 3 is the core part of the system, which is equipped with a high-performance graphics processing card and dedicated image processing software. The combination of these hardware and software enables the system to quickly process a large amount of image data and realize the accurate calculation of the coverage rate of the spray diaphragm. The data transmission unit 4 uses high-speed Ethernet to ensure the speed and stability of data transmission and ensure that the image data can be quickly transmitted from the acquisition unit to the processing unit. On the actual production line, the device can acquire and process images at a speed of 2200 frames per second, accurately calculate the coverage rate of the spray diaphragm, and the detection results are displayed in real time on the control terminal 5. The control terminal 5 uses an industrial computer, which not only has powerful computing power, but also has stable operating performance, can display the detection results in real time, and provides an intuitive interface for the monitoring and management of the production line.

[0069] Example 2

[0070] This embodiment provides an online rapid detection device for the coverage of the sprayed diaphragm. The difference from the embodiment 1 is that in this embodiment, the resolution of the image acquisition unit is increased to 20K pixels, further improving the clarity of the image. The biggest difference is the improvement of the data transmission unit. Wireless transmission is adopted here, which not only reduces the complexity of wiring, but also improves the flexibility and mobility of the system. Although the transmission method has changed, the other components and parameter settings of the system remain consistent with the embodiment 1, ensuring the efficiency and accuracy of the detection.

[0071] Embodiment 1 and embodiment 2 are applied to the online detection of the coverage rate of the sprayed diaphragm, and the detection efficiency and accuracy are both high.

[0072] In the present invention, through the device for online rapid detection of sprayed diaphragm coverage, online and accurate detection of diaphragm spray coverage can be achieved, providing a powerful quality monitoring guarantee for the production process of lithium-ion batteries; at the same time, it can also improve production efficiency, help ensure the quality of battery products, and meet the growing market demand.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific 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. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A device for online rapid detection of spray membrane coverage, characterized in that: include: An image acquisition unit, the image acquisition unit is used to acquire an image of the surface of the sprayed diaphragm and generate image data; an illumination unit, the illumination unit being arranged outside the image acquisition unit, the illumination unit being in a ring shape, and being used for illuminating the image acquisition unit; An image processing unit, the image processing unit is connected to the image acquisition unit, and the image processing unit is used to receive image data from the image acquisition unit, analyze and process the image data, and obtain analysis and processing results; A data transmission unit, the data transmission unit is connected to the image acquisition unit and the image processing unit respectively, and is used to transmit image data from the image acquisition unit to the image processing unit; A control terminal is connected to the image acquisition unit, the image processing unit and the data transmission unit respectively. The data transmission unit transmits the image data and the analysis and processing results to the control terminal. The control terminal is also used to display the image data and the analysis and processing results.

2. The device for online rapid detection of spray membrane coverage according to claim 1, characterized in that: The lighting unit adopts a shadowless annular light source.

3. The device for online rapid detection of spray membrane coverage according to claim 1, characterized in that: The image acquisition unit adopts a high-resolution industrial camera.

4. The device for online rapid detection of spray membrane coverage according to claim 1, characterized in that: The data transmission unit adopts a high-speed Ethernet transmission mode or a wireless transmission mode.

5. The device for online rapid detection of spray membrane coverage according to claim 1, characterized in that: The control terminal adopts an industrial computer.

6. The device for online rapid detection of spray membrane coverage according to claim 1, characterized in that: The control terminal is also used to further analyze and process the image data and analysis and processing results.

7. A detection method for the device for online rapid detection of spraying membrane coverage as claimed in any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1: Turn on the lighting unit and adjust the brightness of the lighting unit, and adjust the position of the lighting unit so that the image acquisition unit is located at the center of the lighting unit; S2: using an image acquisition unit to acquire an image of the sprayed diaphragm surface to be acquired, and generating image data; S3: the image acquisition unit transmits the image data to the image processing unit via the data transmission unit, and the image processing unit receives the image data and extracts the image data information; S4: the image processing unit analyzes and processes the extracted image data information to obtain an analysis and processing result; S5: The image processing unit transmits the analysis and processing result to the control terminal via the data transmission unit; S6: The control terminal receives the analysis and processing result from the image processing unit and displays the analysis and processing result.

8. The detection method of the device for online rapid detection of spraying membrane coverage according to claim 7 is characterized in that: In step S4, the image processing unit analyzes and processes the image data as follows: S41: Processing the image data by using histogram equalization to obtain an equalized processed image; S42: Perform edge detection algorithm and threshold segmentation algorithm processing on the equalized processed image to obtain analysis and processing results.

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