Protective gel into a seal area detection method, system and computer readable storage medium

Abstract

The application discloses a protection glue into a sealing area detection method, a system and a computer readable storage medium, and the method comprises the following steps: acquiring image information of a bare battery cell; grabbing an edge line on a battery cell body block; dividing a region of interest of the image information; calculating a coverage area of a protection glue block contour; taking an area surrounded by the edge line in the image information and offset by a preset length on one side of the lug block as a sealing area, calculating a coverage area of the sealing area; judging whether the coverage area of the protection glue block contour located in the region of interest of the image information and the coverage area of the sealing area have an intersection, and determining whether the protection glue of the bare battery cell enters the sealing area according to the judgment result; the application realizes the protection glue into the sealing area detection in a visual detection mode, and can automatically identify and detect after the bare battery cell is placed on a detection station for image shooting, so that the application is efficient and has high compatibility.

Description

Technical Field

[0001] This invention relates to the field of machine vision inspection technology, and in particular to a method, system, and computer-readable storage medium for detecting protective adhesive entering the sealing area. Background Technology

[0002] With the rapid development of the new energy industry, the market has stricter requirements for the quality of lithium batteries. During the processing of bare cells, protective glue sealing is required to prevent the protective glue from entering the sealing area of ​​the cell and causing lithium battery leakage.

[0003] Current technology primarily relies on manual inspection to determine whether the protective adhesive has entered the sealing area. This method depends heavily on the inspector's experience, condition, and patience, and is prone to missed or false detections, affecting yield. Furthermore, due to differences in cell manufacturing processes among various manufacturers and variations in the color of the protective adhesive, inspectors are susceptible to misidentification based on color, leading to errors in inspection. In summary, current technology cannot reliably and rigorously incorporate the presence of protective adhesive in the sealing area into quality control, severely hindering the development of lithium battery quality testing. Summary of the Invention

[0004] The purpose of this invention is to provide a method, system, and computer-readable storage medium for detecting protective adhesive entering the sealing area. It determines whether the protective adhesive of the bare battery cell has entered the sealing area by judging whether the coverage area of ​​the protective adhesive patch outline located within the region of interest of the image information overlaps with the coverage area of ​​the sealing area. Essentially, it achieves the detection of protective adhesive entering the sealing area through visual inspection, eliminating the need for manual inspection, avoiding missed and false detections, and preventing the impact of missed and false detections on yield. The bare battery cell only needs to be placed at the inspection station for image capture to automatically identify and detect it, making it highly efficient and compatible.

[0005] To achieve the above objectives, this invention discloses a method for detecting protective adhesive entering the sealing area, suitable for detecting whether the protective adhesive of a bare battery cell has entered the sealing area. The bare battery cell includes a cell body and a tab. The inner side of the aluminum film of the cell body has an edge line formed by a recess. The tab is electrically connected to the cell body and is located on the side of the edge line away from the cell body. The cell body is provided with protective adhesive, and the protective adhesive is located on the side of the edge line away from the tab. The method for detecting protective adhesive entering the sealing area includes the following steps:

[0006] S1. Obtain image information of the bare battery cell, wherein the image information includes a cell body image block, a tab image block, and a protective adhesive image block;

[0007] S2. Perform edge line detection on the image information to capture the edge lines on the cell body block;

[0008] S3. Using the edge line as a baseline and the midpoint of the edge line as a reference point, divide the region of interest of the image information.

[0009] S4. Calculate the coverage area of ​​the protective adhesive block outline;

[0010] S5. The area enclosed by the edge line of the image information that is offset by a preset length from the side of the tab block is taken as the sealing area, and the coverage area of ​​the sealing area is calculated.

[0011] S6. Determine whether the coverage area of ​​the protective adhesive block outline located within the region of interest of the image information overlaps with the coverage area of ​​the sealing area, and determine whether the protective adhesive of the bare battery cell enters the sealing area based on the determination result.

[0012] Preferably, step S4 specifically includes:

[0013] S41. Extract the color of the protective adhesive patch;

[0014] S42. Use the HIS color model to generate the color parameters of the protective adhesive patch;

[0015] S43. Perform color binarization processing on the image information to convert the color of the protective adhesive patch to black and convert the color of the part of the image information other than the protective adhesive patch to white.

[0016] S44. Extract the black from the image information according to the BLOB algorithm to generate the outline of the protective glue block in the image information;

[0017] S45. Calculate the coverage area of ​​the protective adhesive block outline.

[0018] Preferably, step S6 specifically includes:

[0019] S61. If the coverage area of ​​the protective adhesive block outline located within the region of interest of the image information does not intersect with the coverage area of ​​the sealing area, then the protective adhesive of the bare battery cell does not enter the sealing area, and the bare battery cell is a good product.

[0020] S62. If the coverage area of ​​the protective adhesive block outline located within the region of interest of the image information intersects with the coverage area of ​​the sealing area, then the protective adhesive of the bare battery cell enters the sealing area, and the bare battery cell is a defective product.

[0021] Preferably, the method for detecting the protective adhesive entering the sealing area further includes the following steps:

[0022] The flicker frequency and brightness of the light source are controlled by preset flicker parameters so that the illumination intensity of the obtained image information of the bare battery cell meets the preset standard.

[0023] Specifically, the light source is a surface light, and the light from the light source is applied to the aluminum film sealing edge of the battery cell body.

[0024] Preferably, the method for detecting the protective adhesive entering the sealing area further includes the following steps:

[0025] If the image information does not include a cell body image block, a tab image block, and / or a protective adhesive image block, then the bare cell to be tested should be added.

[0026] Accordingly, the present invention also discloses a protective adhesive entry into the sealing area detection system, suitable for detecting whether the protective adhesive of a bare battery cell has entered the sealing area. The bare battery cell includes a cell body and a tab. The inner side of the aluminum film of the cell body has an edge line formed by a recess. The tab is electrically connected to the cell body and is located on the side of the edge line away from the cell body. The cell body is provided with protective adhesive, and the protective adhesive is located on the side of the edge line away from the tab. The protective adhesive entry into the sealing area detection system includes:

[0027] The acquisition module is configured to acquire image information of the bare battery cell, wherein the image information includes a cell body image block, a tab image block, and a protective adhesive image block;

[0028] The capture module is configured to perform edge line detection on the image information in order to capture the edge lines on the cell body block;

[0029] The segmentation module is configured to use the edge line as a baseline and the midpoint of the edge line as a reference point to segment the region of interest of the image information.

[0030] The first calculation module is configured to calculate the coverage area of ​​the outline of the protective adhesive patch;

[0031] The second calculation module is configured to use the area enclosed by a preset length offset from the edge line of the image information near the side of the tab block as the sealing area, and to calculate the coverage area of ​​the sealing area.

[0032] The judgment module is configured to determine whether there is an intersection between the coverage area of ​​the protective adhesive block outline located within the region of interest of the image information and the coverage area of ​​the sealing area, and to determine whether the protective adhesive of the bare battery cell has entered the sealing area based on the judgment result.

[0033] Preferably, the first computing module includes:

[0034] The extraction unit is configured to extract the color of the protective adhesive patch;

[0035] The first generation unit is configured to generate color parameters for the protective adhesive patch using the HIS color model;

[0036] The conversion unit is configured to perform color binarization processing on the image information to convert the color of the protective adhesive patch to black and the color of the portion of the image information other than the protective adhesive patch to white.

[0037] The second generation unit is configured to extract black from the image information according to the BLOB algorithm to generate the outline of the protective glue block in the image information;

[0038] The calculation unit is configured to calculate the coverage area of ​​the protective adhesive patch outline.

[0039] Accordingly, the present invention also discloses a computer-readable storage medium for storing a computer program, which, when executed by a processor, implements the method for detecting protective adhesive entering the sealing area as described above.

[0040] Compared with existing technologies, this invention determines whether the protective adhesive of the bare battery cell has entered the sealing area by judging whether the coverage area of ​​the protective adhesive block outline located in the region of interest of the image information overlaps with the coverage area of ​​the sealing area. In essence, it realizes the detection of protective adhesive entering the sealing area through visual inspection, without the need for manual inspection, which can avoid missed detection and false detection, and eliminate the impact of missed detection and false detection on the yield rate. The detection process only requires placing the bare battery cell at the inspection station for image capture, which can be automatically identified and completed. It is efficient and highly compatible. Attached Figure Description

[0041] Figure 1 This is a flowchart of the method for detecting protective adhesive entering the sealing area according to the present invention;

[0042] Figure 2 This is a schematic diagram of visual detection of image information according to the present invention;

[0043] Figure 3 This is a structural block diagram of the protective adhesive detection system for the sealing area according to the present invention. Detailed Implementation

[0044] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0045] Please see Figure 1 and Figure 2As shown, the protective adhesive entry detection method of this embodiment is suitable for detecting whether the protective adhesive of a bare battery cell has entered the sealing area 6. The bare battery cell includes a cell body and tabs. The inner side of the aluminum film of the cell body has an edge line formed by a recess. The tabs are electrically connected to the cell body and are located on the side of the edge line away from the cell body. Typically, there are two tabs, one of which is electrically connected to the positive terminal of the cell body, and the other is electrically connected to the negative terminal of the cell body. The cell body is provided with protective adhesive, and the protective adhesive is located on the side of the edge line away from the tabs.

[0046] Understandably, the protective adhesive here is mainly used to reinforce and protect the surface of the battery cell and the connection between the battery cell and the tabs. However, the protective adhesive can flow during the application process or at high temperatures, and there is a possibility that too much adhesive may penetrate the tabs. When too much adhesive penetrates the tabs, the conductive parts of the tabs may not be fully exposed, affecting the electrical connection.

[0047] The method for detecting the protective adhesive entering the sealing area includes the following steps:

[0048] S1. Obtain image information 1 of the bare battery cell, wherein the image information 1 has a cell body block 2, a tab block 3, and a protective adhesive block 4.

[0049] Understandably, the purpose of this step is to obtain an image of the bare battery cell for subsequent visual inspection.

[0050] Furthermore, if the image information 1 does not include the cell body image 2, the tab image 3, and / or the protective adhesive image 4, then a bare cell to be inspected is added. When the image information 1 does not include the cell body image 2, the tab image 3, and / or the protective adhesive image 4, it can be considered that a bare cell has not been placed at the current inspection station, or that a bare cell has already been placed at the current inspection station, and at that time the bare cell has a defect (i.e., it is a defective product and no additional inspection is required).

[0051] S2. Perform edge line detection on the image information 1 to capture the edge lines on the cell body block 2;

[0052] S3. Using the edge line as a reference line and the midpoint of the edge line as a reference point, divide the image information 1 into regions of interest 5. The region of interest 5 here refers to all or part of the area of ​​image information 1 that is of interest in actual detection, such as all or part of the area on the cell body block 2, or all or part of the area on the cell body block 2 and the tab body. The size of the region of interest 5 can be determined based on the size of the protective adhesive and the size of the sealing area 6.

[0053] S4. Calculate the coverage area of ​​the outline of the protective adhesive block 4;

[0054] S5. The area enclosed by the edge line of the image information 1 that is offset by a preset length from the side of the tab block 3 is taken as the sealing area 6, and the coverage area of ​​the sealing area 6 is calculated.

[0055] It is understood that the coverage area mentioned above is a set of regional coordinates in the XY plane.

[0056] S6. Determine whether the coverage area of ​​the protective adhesive block 4 within the region of interest 5 of the image information 1 intersects with the coverage area of ​​the sealing area 6, and determine whether the protective adhesive of the bare battery cell enters the sealing area 6 based on the determination result.

[0057] Preferably, step S4 specifically includes:

[0058] S41. Extract the color of the protective adhesive patch 4, such as the green protective adhesive in this embodiment;

[0059] S42. The color parameters of the protective adhesive patch 4 are generated using the HIS color model, and the color parameters of the protective adhesive patch 4 are used to distinguish the colors of the image information 1 for subsequent focusing processing of the green part in the image information 1.

[0060] The HIS color model is accessible through a software interface, allowing manual extraction via a color picker or online parameter modification. It also provides real-time full-color gamut data for intuitive adjustment, ensuring accurate color extraction. A key advantage of the HIS color model is its ability to eliminate the influence of intensity components from the inherent color information (hue and saturation) in color images. When processing color images, only the I (luminance) component needs to be processed, without altering the color spectrum of the original image. Compared to color models like RGB and HSV, the HIS color model is the most natural and intuitive for the human eye, distinguishing colors solely by hue, saturation, and luminance, fully reflecting the fundamental attributes of human color perception and corresponding directly to human color perception.

[0061] S43. Perform color binarization processing on the image information 1 to convert the color of the protective adhesive patch 4 to black, and convert the colors of the parts of the image information 1 other than the protective adhesive patch 4 to white. For example, convert the green in the image information 1 to black through color binarization processing, and convert the colors of the image information 1 other than green to white through color binarization processing, so as to improve the recognizability of the color protective adhesive.

[0062] S44. Extract the black from the image information 1 according to the BLOB algorithm to generate the outline of the protective glue block 4 in the image information 1;

[0063] S45. Calculate the coverage area of ​​the outline of the protective adhesive block 4. In other preferred embodiments, the coverage area of ​​the outline of the protective adhesive block 4 can also be calculated simultaneously, and the overlap between the coverage area and the coverage area of ​​the outline of the protective adhesive block 4 can be determined.

[0064] Preferably, step S6 specifically includes:

[0065] S61. If the coverage area of ​​the protective adhesive block 4 within the region of interest 5 of the image information 1 does not intersect with the coverage area of ​​the sealing region 6, then the protective adhesive of the bare battery cell does not enter the sealing region 6, and the bare battery cell is a good product.

[0066] S62. If the coverage area of ​​the protective adhesive block 4 within the region of interest 5 of the image information 1 intersects with the coverage area of ​​the sealing area 6, then the protective adhesive of the bare battery cell enters the sealing area 6, and the bare battery cell is a defective product.

[0067] Regarding the method for determining the area covered, step S6 can be further specified as follows:

[0068] S61. If the coverage area and coverage area of ​​the protective adhesive block 4 located in the region of interest 5 of the image information 1 do not intersect with the coverage area and coverage area of ​​the sealing region 6, then the protective adhesive of the bare battery cell does not enter the sealing region 6, and the bare battery cell is a good product.

[0069] S62. If the coverage area and coverage area of ​​the protective adhesive block 4 located in the region of interest 5 of the image information 1 intersect with the coverage area and coverage area of ​​the sealing region 6, then the protective adhesive of the bare battery cell enters the sealing region 6, and the bare battery cell is a defective product.

[0070] If the specification is set such that the protective adhesive extends 0.5mm beyond the inner edge of the aluminum foil, it is considered to be part of the sealing area 6. Then, the area enclosed by shifting the inner edge of the aluminum foil downwards by 0.5mm is defined as the sealing area 6. It is then determined whether the area covered by the protective adhesive intersects with the sealing area 6. If there is an intersection, it is considered a defective product; otherwise, it is considered a good product.

[0071] Preferably, the method for detecting the protective adhesive entering the sealing area further includes the following steps:

[0072] The flicker frequency and brightness of the light source are controlled by preset flicker parameters so that the light intensity of the obtained image information 1 of the bare battery cell meets the preset standard, which can effectively extend the service life of the light source, and will not affect the lighting environment or interfere with other test items.

[0073] Specifically, the light source is a surface light, and the light from the light source illuminates the aluminum film sealing edge of the battery cell body. It can be understood that the illumination angle of the surface light is easy to adjust, and by illuminating the aluminum film sealing edge of the battery cell body with the light from the light source, the reflection of other unknown light by the aluminum film is avoided.

[0074] Please see Figure 3 As shown, correspondingly, the present invention also discloses a protective adhesive entry into the sealing area detection system, suitable for detecting whether the protective adhesive of a bare battery cell has entered the sealing area 6. The bare battery cell includes a cell body and a tab. The inner side of the aluminum film of the cell body has an edge line formed by a recess. The tab is electrically connected to the cell body and is located on the side of the edge line away from the cell body. The cell body is provided with protective adhesive, and the protective adhesive is located on the side of the edge line away from the tab. The protective adhesive entry into the sealing area detection system includes:

[0075] The acquisition module 10 is configured to acquire image information 1 of the bare battery cell, wherein the image information 1 has a battery cell body block 2, a tab block 3, and a protective adhesive block 4;

[0076] The capturing module 20 is configured to perform edge line detection on the image information 1 in order to capture the edge lines on the cell body block 2;

[0077] The segmentation module 30 is configured to use the edge line as a reference line and the midpoint of the edge line as a reference point to segment the region of interest 5 of the image information 1.

[0078] The first calculation module 40 is configured to calculate the coverage area of ​​the outline of the protective adhesive patch 4;

[0079] The second calculation module 50 is configured to use the area enclosed by a preset length offset from the edge line of the image information 1 on the side adjacent to the tab 3 as the sealing area 6, and calculate the coverage area of ​​the sealing area 6.

[0080] The judgment module 60 is configured to determine whether there is an intersection between the coverage area of ​​the protective adhesive block 4 outline located in the region of interest 5 of the image information 1 and the coverage area of ​​the sealing area 6, and to determine whether the protective adhesive of the bare battery cell enters the sealing area 6 based on the judgment result.

[0081] Preferably, the first computing module includes:

[0082] The extraction unit is configured to extract the color of the protective adhesive patch 4;

[0083] The first generation unit is configured to generate the color parameters of the protective adhesive patch 4 using the HIS color model;

[0084] The conversion unit is configured to perform color binarization processing on the image information 1 to convert the color of the protective adhesive patch 4 to black and the color of the part of the image information 1 other than the protective adhesive patch 4 to white.

[0085] The second generation unit is configured to extract black from the image information 1 according to the BLOB algorithm to generate the outline of the protective glue block 4 in the image information 1.

[0086] The calculation unit is configured to calculate the coverage area of ​​the outline of the protective adhesive patch 4.

[0087] Accordingly, the present invention also discloses a computer-readable storage medium for storing a computer program, which, when executed by a processor, implements the method for detecting protective adhesive entering the sealing area as described above.

[0088] Combination Figures 1-3 This invention determines whether the protective adhesive of the bare battery cell has entered the sealing area 6 by judging whether the coverage area of ​​the protective adhesive block 4 located in the region of interest 5 of the image information 1 overlaps with the coverage area of ​​the sealing area 6. In essence, it realizes the detection of protective adhesive entering the sealing area by visual inspection, without the need for manual inspection, which can avoid missed detection and false detection, and eliminate the impact of missed detection and false detection on the yield rate. It can automatically identify and detect the bare battery cell after placing it at the inspection station and taking an image. It is efficient and highly compatible.

[0089] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for detecting whether protective glue enters a sealing area, the method being suitable for detecting whether protective glue enters a sealing area of a bare cell, the bare cell comprising a cell body and a tab, an edge line being formed on a concave pit on an inner side of an aluminum film of the cell body, the tab being electrically connected to the cell body and located on a side of the edge line away from the cell body, the cell body being provided with protective glue, and the protective glue being located on a side of the edge line away from the tab, characterized in that, The protection glue into the sealing area detection method comprises the following steps: Obtain image information of the bare battery cell, wherein the image information has a battery cell body block, a tab block and a protection glue block; Edge line detection is performed on the image information to capture the edge line on the battery cell body block; The edge line is used as a reference line, and the midpoint of the edge line is used as a reference point to divide the region of interest of the image information; The coverage area of the protection glue block profile is calculated; The region surrounded by the edge line offsetting a preset length on the side adjacent to the tab block in the image information is used as a sealing area, and the coverage area of the sealing area is calculated; It is judged whether there is an intersection between the coverage area of the protection glue block profile and the coverage area of the sealing area in the region of interest of the image information, and the protection glue of the bare battery cell is determined according to the judgment result.

2. The method for detecting protective adhesive entering the sealing area as described in claim 1, characterized in that, The calculation of the coverage area of the protection glue block profile specifically comprises: Extracting the color of the protection glue block; Generating the color parameters of the protection glue block by using the HIS color model; Color binarization processing is performed on the image information to convert the color of the protection glue block to black and the color of the part other than the protection glue block in the image information to white; The black in the image information is captured according to the BLOB algorithm to generate the protection glue block profile in the image information; The coverage area of the protection glue block profile is calculated.

3. The method for detecting protective adhesive entering the sealing area as described in claim 1, characterized in that, The judgment of whether there is an intersection between the coverage area of the protection glue block profile and the coverage area of the sealing area in the region of interest of the image information, and the determination of the protection glue of the bare battery cell according to the judgment result specifically comprises: If there is no intersection between the coverage area of the protection glue block profile and the coverage area of the sealing area in the region of interest of the image information, the protection glue of the bare battery cell does not enter the sealing area, and the bare battery cell is a good product; If there is an intersection between the coverage area of the protection glue block profile and the coverage area of the sealing area in the region of interest of the image information, the protection glue of the bare battery cell enters the sealing area, and the bare battery cell is a defective product.

4. The method for detecting protective adhesive entering the sealing area as described in claim 1, characterized in that, The protection glue into the sealing area detection method further comprises the following steps: The strobe frequency and the strobe brightness of the light source are controlled by using preset strobe parameters, so that the illumination intensity of the obtained image information of the bare battery cell meets the preset standard.

5. The method for detecting protective adhesive entering the sealing area as described in claim 4, characterized in that, The light source is a surface light, and the light of the light source is exposed on the aluminum film edge of the battery cell body.

6. The method for detecting protective adhesive entering the sealing area as described in claim 1, characterized in that, The protection glue into the sealing area detection method further comprises the following steps: If the image information does not contain the battery cell body block, the tab block and / or the protection glue block, the bare battery cell to be detected is supplemented.

7. A protection gum into seal area detection system suitable for detecting whether the protection gum of a bare cell enters a seal area, the bare cell comprising a cell body and a tab, an edge line is formed on an inner side recess of an aluminum film of the cell body, the tab is electrically connected to the cell body and is located on a side of the edge line away from the cell body, the cell body is provided with a protection gum, and the protection gum is located on a side of the edge line away from the tab, characterized in that, The protection glue into the sealing area detection system comprises: An acquisition module configured to obtain image information of the bare battery cell, wherein the image information has a battery cell body block, a tab block and a protection glue block; A capture module configured to perform edge line detection on the image information to capture the edge line on the battery cell body block; The dividing module is configured to divide a region of interest of the image information by taking the edge line as a reference line and a midpoint of the edge line as a reference point; The first calculating module is configured to calculate a coverage area of the protective glue block contour; The second calculating module is configured to calculate a coverage area of a sealing area by taking an area surrounded by the edge line adjacent to one side of the tab block with a preset length as the sealing area; The judging module is configured to judge whether there is an intersection between the coverage area of the protective glue block contour and the coverage area of the sealing area in the region of interest of the image information, and determine whether the protective glue of the bare cell enters the sealing area according to the judgment result.

8. The seal area detection system of claim 7, wherein the seal area is a seal area of a seal of the package. The first calculating module comprises: The extracting unit is configured to extract the color of the protective glue block; The first generating unit is configured to generate a color parameter of the protective glue block by using an HIS color model; The converting unit is configured to perform color binarization processing on the image information to convert the color of the protective glue block into black and convert the color of the part of the image information other than the protective glue block into white; The second generating unit is configured to generate the protective glue block contour in the image information by grabbing the black in the image information according to a BLOB algorithm; The calculating unit is configured to calculate the coverage area of the protective glue block contour.

9. A computer readable storage medium for storing a computer program, characterized in that: The program is executed by the processor to realize the protective glue into sealing area detection method in any one of claims 1-6.

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