CN115901792A - Glue line defect detection method - Google Patents
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- CN115901792A CN115901792A CN202211736796.8A CN202211736796A CN115901792A CN 115901792 A CN115901792 A CN 115901792A CN 202211736796 A CN202211736796 A CN 202211736796A CN 115901792 A CN115901792 A CN 115901792A
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- 239000003292 glue Substances 0.000 title claims abstract description 222
- 230000007547 defect Effects 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims description 26
- 238000013507 mapping Methods 0.000 claims description 9
- 230000000007 visual effect Effects 0.000 claims description 8
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- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
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Abstract
The application discloses a glue line defect detection method, which comprises the following steps: acquiring a battery cell image, and positioning the position of the battery cell skirt; identifying a glue line of the battery cell, and calculating the distance from the glue line to the skirt edge of the battery cell and the glue width of the glue line; judging whether the glue line has defects or not according to the distance from the glue line to the skirt edge of the battery cell and the glue width of the glue line; whether the line has a defect is judged to glue through the width of gluing the line and the distance of gluing line to electric core shirt rim, has avoided because factors such as slide rail shift position deviation, dispensing head shift deviation, vision positioning deviation lead to the point of gluing the station glue not good electric core of quality to put into use, has improved the yields and the performance of electric core.
Description
Technical Field
The application relates to the technical field of defect detection, in particular to a glue line defect detection method.
Background
After the battery cell moves to the dispensing position on the profiling jig to complete dispensing, the dispensing quality of the dispensing position is affected by the factors such as the deviation of the moving position of the slide rail, the deviation of the moving position of the dispensing head, the deviation of the visual positioning and the like, and the yield and the usability of the battery cell are further affected. Therefore, the glue line needs to be detected, and defective products can be found in time so as to ensure the quality and performance of the glue line.
Disclosure of Invention
The application provides a glue line defect detection method, which is used for improving the yield and the usability of a battery cell.
In view of this, the first aspect of the present application provides a method for detecting a glue line defect, including:
acquiring a battery cell image, and positioning the position of the battery cell skirt;
identifying a glue line of the battery cell, and calculating the distance from the glue line to the skirt edge of the battery cell and the glue width of the glue line;
and judging whether the glue line has defects according to the distance from the glue line to the skirt edge of the battery core and the glue width of the glue line.
Optionally, the acquiring the battery cell image includes:
shooting a battery cell left side skirt edge from the left upper side of the battery cell through a left camera to obtain a battery cell left side image;
shooting the right skirt edge of the battery cell from the right upper part of the battery cell through a right camera to obtain a right image of the battery cell, wherein the visual fields of the left camera and the right camera have a crossed area;
and taking the battery cell left side image and the battery cell right side image as battery cell images, or splicing the battery cell left side image and the battery cell right side image to obtain a spliced image, and taking the spliced image as the battery cell image.
Optionally, the positioning of the cell skirt includes:
extracting a head edge line, a tail edge line and a side edge line of the battery cell skirt edge from the battery cell image;
and calculating the intersection points of the head edge line, the tail edge line and the side edge line of the battery cell skirt edge to obtain the position of the battery cell skirt edge.
Optionally, the glue line of discernment electricity core includes:
determining a head area and a tail area of the glue line according to the intersection points of the head edge line and the tail edge line of the battery cell skirt edge and the side edge line;
acquiring a head mass center position according to the head area of the glue line, and determining the head position of the glue line according to the head area of the glue line and the head mass center position;
and acquiring a tail mass center position according to the tail area of the glue line, and determining the tail position of the glue line according to the tail area of the glue line and the tail mass center position.
Optionally, the method further includes:
generating a straight line based on the fitting of the position of the mass center of the head, acquiring an intersection point of the straight line and the edge line of the head of the skirt edge of the battery cell, and calculating the distance between the position of the head of the glue line and the intersection point to obtain the distance between the head of the glue line and the head of the skirt edge of the battery cell;
and detecting the initial position of the glue dripping based on the distance between the head of the glue line and the skirt edge of the battery cell.
Optionally, the calculating the distance from the glue line to the skirt of the battery cell and the glue width of the glue line includes:
setting a search range of a caliper tool, and setting an initial position and an end position of the caliper tool in the electric core image according to the head position and the tail position of the glue line;
traversing the glue line from the initial position to the end position through a caliper tool, and acquiring the distance from the upper edge and the lower edge of the traversed glue line to the side edge of the skirt edge of the battery cell and the glue width of the glue line.
Optionally, when the electrical core image is the spliced image, the setting of the start position and the end position of the caliper tool in the electrical core image according to the head position and the tail position of the glue line includes:
taking the head part of the glue line as a starting position and the tail part as an ending position;
or, the tail part of the glue line is used as a starting position, and the head part is used as an ending position.
Optionally, when the battery cell image includes the battery cell left side image and the battery cell right side image, the setting of the initial position and the end position of the caliper tool in the battery cell image according to the head position and the tail position of the glue line includes:
for the image on the left side of the electric core, taking the head part of the glue line as an initial position, and taking an intersection point of the glue line and the image edge of the image on the left side of the electric core as an end position;
and regarding the image on the right side of the electric core, taking the tail part of the glue line as an initial position, and taking the intersection point of the glue line and the image edge of the image on the right side of the electric core as an end position.
Optionally, the method further includes:
the left camera and the right camera are calibrated through the calibration block, laser lines in the horizontal direction and the vertical direction are engraved on the left side face and the right side face of the calibration block, and the laser lines are used for determining whether the visual field directions and the visual field images of the left camera and the right camera are clear or not.
Optionally, the splicing the battery cell left side image and the battery cell right side image to obtain a spliced image includes:
obtaining the mapping relation between the image coordinate systems of the left camera and the right camera to the world coordinate system according to the calibration result obtained by calibrating the left camera and the right camera by the calibration block;
and respectively mapping the left image of the battery cell and the right image of the battery cell to a world coordinate system according to the mapping relation between the image coordinate systems of the left camera and the right camera to the world coordinate system for image splicing to obtain spliced images.
According to the technical scheme, the method has the following advantages:
the application provides a glue line defect detection method, which comprises the following steps: acquiring a battery cell image, and positioning the position of the battery cell skirt; identifying a glue line of the battery cell, and calculating the distance from the glue line to the skirt edge of the battery cell and the glue width of the glue line; and judging whether the glue line has defects according to the distance from the glue line to the skirt edge of the battery core and the glue width of the glue line.
In this application, accomplish the point at electric core and glue the back, gather electric core image, through carrying out analysis and processing to electric core image and acquire the glue width of gluing the line and glue the line to the distance of electric core shirt rim, and then judge through the glue width of gluing the line and glue the line to the distance of electric core shirt rim and glue the line and whether have the defect, avoid because slide rail shift position deviation, the first migration deviation of gluing of point, factors such as vision positioning deviation lead to the point of gluing the station glue the not good electric core of quality put into use, the yields and the performance of improvement electric core.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flowchart of a glue line defect detection method according to an embodiment of the present disclosure;
fig. 2 is a schematic view illustrating installation of left and right cameras according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a calibration block according to an embodiment of the present application;
fig. 4 is a schematic diagram of a relationship between a calibration block and a battery cell provided in an embodiment of the present application;
fig. 5 is a schematic diagram of a head target area in a left image of a cell provided in an embodiment of the present application;
fig. 6 is a schematic diagram of a head area of a glue line in an image on the left side of a battery cell provided in the embodiment of the present application;
FIG. 7 is a schematic diagram of a straight line generated based on head centroid position fitting provided by an embodiment of the present application;
fig. 8 is a schematic diagram of an intersection point of a straight line and a head edge line of a cell skirt provided in an embodiment of the present application;
fig. 9 is a schematic diagram illustrating a distance between a head of a glue line and a skirt head of a cell provided in an embodiment of the present application;
fig. 10 is a schematic diagram of a starting position and an ending position of an image on the left side of a battery cell provided in an embodiment of the present application;
fig. 11 is a schematic diagram of a starting position and an ending position of an image on the right side of a cell provided in the embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For easy understanding, please refer to fig. 1, an embodiment of the present application provides a glue line defect detecting method, including:
The battery cell can be shot from the upper part of the battery cell through the camera, and a battery cell image is obtained. The embodiment of the application considers that one camera is difficult to shoot a clear and complete arc-shaped battery cell, and the subsequent glue line defect detection result can be influenced. In order to improve this problem, this application embodiment adopts two cameras to shoot the left side and the right side of electric core respectively simultaneously. Referring to the installation schematic diagram of two cameras provided in fig. 2, the left camera is located above the left side of the battery cell, the right camera is located above the right side of the battery cell, specifically, the left camera may be located on a perpendicular bisector of a line connecting a left corner point of the battery cell left side skirt and a vertex of the battery cell skirt, and the right camera may be located on a perpendicular bisector of a line connecting a right corner point of the battery cell right side skirt and the vertex of the battery cell skirt, so that the depth of field of the left camera and the depth of field of the right camera may be maximized, and the fields of view of the left camera and the right camera have a crossing region to prevent missed shooting of the battery cell. Can set up the light source above the electricity core to shoot clear gluey line.
Furthermore, after the left camera and the right camera are installed, the left camera and the right camera can be calibrated, and the cameras can be calibrated through the calibration block. When the calibration block is used, the battery cell clamp is detached, the calibration block is installed on the base, then the battery cell clamp is installed, and the definition of the camera view image above the calibration block can be adjusted. The structural schematic diagram of the calibration block in the embodiment of the application is shown in fig. 3, the front view of the calibration block is triangular, an arc-shaped battery cell is attached, the left view and the right view of the calibration block are both rectangular, two hypotenuses of the triangle are bisectors of a battery cell skirt tangent line and a connection line of a battery cell skirt vertex, a left corner point and a right corner point, and as shown in fig. 4, the bottom side of the triangle is a contact surface of a battery cell clamp and a base below the battery cell clamp; the length of the calibration block is the same as the width of the battery cell, laser scribes are arranged on the left side surface and the right side surface of the calibration block, reference can be made to the left view and the right view in fig. 3, the line width of the laser line is 0.1mm, the laser line in the vertical direction (namely the line 1 in fig. 3) is the skirt edge which is deviated inwards by 2mm, the laser line in the horizontal direction (namely the line 2 in fig. 3) is the central line of the connecting line of the vertex of the battery cell skirt edge and the left (right) angular point, and the central line of the laser head is perpendicular to the inclined plane during laser scribes. Two laser lines may be used to confirm whether the camera view image is clear, focused or not, and to confirm the camera view orientation, where the laser line that marks the vertical direction of the block is to be in the middle of the camera view. It should be noted that the specific process of calibrating the camera by the calibration block belongs to the prior art, and the specific calibration process is not described herein again.
After the camera calibration is finished, the battery cell left side skirt edge can be shot from the left upper side of the battery cell through a left camera, and a battery cell left side image is obtained; and shooting the right skirt edge of the battery cell from the upper right of the battery cell through the right camera to obtain the right image of the battery cell.
In an embodiment, the battery cell left side image and the battery cell right side image may be used as the battery cell image, and in a subsequent processing process, the glue line defect detection is performed on the battery cell left side image and the battery cell right side image respectively.
In another embodiment, in order to improve the detection speed of the glue line defect, the image of the left side of the battery cell and the image of the right side of the battery cell may be spliced to obtain a spliced image, and the spliced image is used as the image of the battery cell. And the spliced image can be directly subjected to glue line defect detection subsequently. When the battery cell left side image and the battery cell right side image are spliced, the mapping relation between the image coordinate systems of the left camera and the right camera and the world coordinate system can be obtained according to the calibration result obtained by calibrating the left camera and the right camera by the calibration block; and respectively mapping the left image of the battery cell and the right image of the battery cell to the world coordinate system according to the mapping relation between the image coordinate system of the left camera and the image coordinate system of the right camera to the world coordinate system for image splicing to obtain spliced images. Because the fields of vision of the left camera and the right camera are crossed, that is, the left image of the battery cell obtained by shooting by the left camera and the right image of the battery cell obtained by shooting by the right camera are overlapped, the left image of the battery cell and the right image of the battery cell are respectively mapped to the same world coordinate system according to the calibration result, then the overlapped area of the left image of the battery cell and the right image of the battery cell in the same world coordinate system can be determined, and then the left image of the battery cell and the right image of the battery cell can be spliced according to the overlapped area to obtain a spliced image.
And after the battery cell image is acquired, positioning the position of the battery cell skirt edge from the battery cell image. The head edge line, the tail edge line and the side edge line of the skirt edge of the battery cell can be extracted from the battery cell image; and calculating the intersection points of the head edge line, the tail edge line and the side edge line of the battery cell skirt edge to obtain the position of the battery cell skirt edge. The battery cell can have position fluctuation at the camera vision position, and the dispensing platform has mechanical positioning, so the position fluctuation of the battery cell is in a certain range. The position fluctuation range of the battery cell can be covered by a search area of the caliper tool, and then edge straight lines are found at the head, the tail and the side edges of the battery cell skirt edge respectively to obtain a head edge line, a tail edge line and a side edge line of the battery cell skirt edge; and then calculating the intersection point of the head edge line and the side edge line of the battery cell skirt edge and the intersection point of the tail edge line and the side edge line of the battery cell skirt edge to realize battery cell skirt edge positioning.
It can be understood that, when the cell image is the cell left side image and the cell right side image, the cell left side image only includes the head portion (i.e., the left side skirt edge) of the cell skirt edge, and the tail portion (i.e., the right side skirt edge) of the cell skirt edge is in the cell right side image, when the cell skirt edge in the cell left side image and the cell right side image is located, the head margin line and the side margin line of the cell skirt edge are extracted from the cell left side image by the caliper tool, the tail margin line and the side margin line of the cell skirt edge are extracted from the cell right side image by the caliper tool, the intersection point of the head margin line and the side margin line of the cell skirt edge is calculated in the cell left side image, and the intersection point of the tail margin line and the side margin line of the cell skirt edge is calculated in the cell right side image.
When the battery cell image is a spliced image formed by splicing the battery cell left side image and the battery cell right side image, a complete battery cell skirt edge exists in the spliced image, when the battery cell skirt edge in the spliced image is positioned, the head edge line, the tail edge line and the side edge line of the battery cell skirt edge can be extracted from the spliced image simultaneously through a caliper tool, and the intersection point of the head edge line and the side edge line of the battery cell skirt edge, and the intersection point of the tail edge line and the side edge line of the battery cell skirt edge are calculated.
And 102, identifying a glue line of the battery cell, and calculating the distance from the glue line to the skirt edge of the battery cell and the glue width of the glue line.
After the intersection point of the head edge line and the side edge line of the battery cell skirt border and the intersection point of the tail edge line and the side edge line of the battery cell skirt border are obtained, the position of the glue line of the battery cell in the battery cell image can be identified according to the intersection point position, and the specific process is as follows:
determining a head area and a tail area of the glue line according to the intersection points of the head edge line and the tail edge line of the battery cell skirt edge and the side edge line;
acquiring a head mass center position according to the head area of the glue line, and determining the head position of the glue line according to the head area of the glue line and the head mass center position;
and acquiring the tail mass center position according to the tail area of the glue line, and determining the tail position of the glue line according to the tail area of the glue line and the tail mass center position.
Specifically, the head target area and the tail target area can be obtained by respectively offsetting a first preset distance in the horizontal direction and a second preset distance in the vertical direction by taking the head edge line and the intersection point of the tail edge line and the side edge line of the skirt edge of the battery cell as reference points; then determining a head area of the glue line in the head target area, and determining a tail area of the glue line in the tail target area; acquiring a head mass center position according to the head area of the glue line, and determining the head position of the glue line according to the head area of the glue line and the head mass center position; and acquiring the tail mass center position according to the tail area of the glue line, and determining the tail position of the glue line according to the tail area of the glue line and the tail mass center position.
Taking the left image of the battery cell as an example, deviating a certain area by taking the intersection point of the head edge line and the side edge line of the skirt edge of the battery cell in the left image of the battery cell as a reference point, so as to obtain a head target area shown in fig. 5, namely a rectangular frame in fig. 5; the head mass center position can be obtained by determining the head area of the glue line (as shown in fig. 6) and the mass center position of the head area of the glue line in the head target area through a Blob tool; the Blob tool can output the length and the width of the head area of the glue line after determining the head area of the glue line, and the head position of the head area of the glue line can be calculated according to the center of mass position of the head and the length and the width of the head area of the glue line, so that the head position of the glue line is obtained. It can be understood that the process of obtaining the tail position of the glue line from the right side image of the electrical core is similar to the process of obtaining the head position of the glue line from the left side image of the electrical core, and detailed description of the process is omitted here.
Furthermore, considering the detection requirement of the glue dripping position, the glue dripping initial positions are required to be the same when glue is dripped every time, the distance d between the head of the glue line and the skirt head of the electric core can be calculated according to the head position of the glue line, the glue dripping initial positions can be detected through the distance d, whether the glue dripping initial positions of the electric cores are the same or not is determined, and if not, the glue dripping effect of the current electric core does not reach the expected effect. Specifically, a straight line (as shown in fig. 7) may be generated based on the fitting of the center of mass of the head, an intersection point (as shown in fig. 8) between the straight line and the edge line of the head of the skirt of the battery cell is obtained, and the distance between the head of the glue line and the head of the skirt of the battery cell is obtained by calculating the distance between the head of the glue line and the intersection point (as shown in fig. 9); the glue dripping initial position is detected based on the distance between the head of the glue line and the skirt head of the electric core, if the distance between the head of the glue line and the skirt head of the electric core is equal to a preset distance, the glue dripping initial position of the electric core meets a preset requirement, and if the distance between the head of the glue line and the skirt head of the electric core is smaller than or larger than the preset distance, the glue dripping initial position of the electric core does not meet the preset requirement.
After the glue line of the battery cell is identified and the head position and the tail position of the glue line are obtained, traversing can be performed on the glue line in the battery cell image from the head position or the tail position, and the distance from the upper edge and the lower edge of the glue line to the side edge of the skirt edge of the battery cell and the glue width of the glue line are obtained. Setting a search range of the caliper tool, and setting a starting position and an ending position of the caliper tool in the battery cell image according to the head position and the tail position of the rubber wire; traversing the glue line from the initial position to the end position through a caliper tool, and acquiring the distance from the upper edge and the lower edge of the traversed glue line to the side edge of the skirt edge of the battery cell and the glue width of the glue line. After the head position and the tail position of the rubber line are obtained, the initial position and the end position of the caliper tool can be set according to the head position and the tail position of the rubber line, the caliper tool is placed at the initial position, relevant parameters of the caliper tool are set according to actual needs, if the search range of the caliper tool is set, the caliper tool can traverse to the end position from the initial position of the rubber line according to the set parameters, a section of the rubber line can be intercepted when the rubber line is traversed every time (refer to fig. 10 and fig. 11), and the upper edge of the section of the rubber line, the maximum value, the minimum value and the median value of the distance from the lower edge to the skirt side edge of the battery core and the rubber width of the section of the rubber line are output.
In one embodiment, when the electrical core image is a spliced image, the head position of the glue line may be used as a starting position, and the tail position is used as an ending position, so that the caliper tool traverses from the head position of the glue line to the tail position of the glue line; or the tail position of the glue line is taken as the starting position, and the head position is taken as the ending position, so that the caliper tool traverses from the tail position of the glue line to the head position of the glue line.
In another embodiment, when the image of the battery cell includes an image of a left side of the battery cell and an image of a right side of the battery cell, regarding the image of the left side of the battery cell, a head portion of the glue line is taken as a start position, and an intersection point of the glue line and an image edge of the image of the left side of the battery cell is taken as an end position, please refer to fig. 10.
For the right image of the electrical core, please refer to fig. 11, where the tail position of the glue line is taken as the starting position, and the intersection point of the glue line and the image edge of the right image of the electrical core is taken as the ending position.
And 103, judging whether the glue line has defects or not according to the distance from the glue line to the skirt edge of the battery core and the glue width of the glue line.
Whether the glue line has defects can be judged according to the distance from the upper edge and the lower edge of the glue line to the skirt side edge of the battery core and the glue width of the glue line, and the defect types of the glue line comprise glue breaking, glue overflowing, large-head glue, wire drawing and the like. For example, whether the glue line has glue break can be judged through the glue width of the glue line, and if the glue width of a certain section of traversed glue line is 0, the glue line has the glue break defect; and if the minimum value of the distance from the lower edge of the traversed certain section of the glue line to the side edge of the skirt edge of the battery cell is 0 or the maximum value of the distance from the lower edge of the traversed certain section of the glue line to the side edge of the skirt edge of the battery cell is larger than a preset distance threshold value, indicating that the glue overflow defect exists in the section of the glue line.
In the embodiment of the application, accomplish the point at electric core and glue the back, gather electric core image, through carrying out analysis and processing to electric core image and acquire the glue width of gluing the line and glue the distance of line to electric core shirt rim, and then judge through the glue width of gluing the line and glue the distance of line to electric core shirt rim and glue the line and have disconnected glue, overflow and glue, the major part is glued, defects such as wire drawing, avoid because slide rail shift position deviation, the first removal deviation of point gum, factors such as visual positioning deviation lead to the point of gluing the station glue not good electric core of quality and put into use, the yields and the performance of electric core are improved.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, or portions or all or portions of the technical solutions that contribute to the prior art, may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for executing all or part of the steps of the methods described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.
Claims (10)
1. A glue line defect detection method is characterized by comprising the following steps:
acquiring a battery cell image, and positioning the position of the battery cell skirt;
identifying a glue line of the battery cell, and calculating the distance from the glue line to the skirt edge of the battery cell and the glue width of the glue line;
and judging whether the glue line has defects according to the distance from the glue line to the skirt edge of the battery core and the glue width of the glue line.
2. The glue line defect detecting method of claim 1, wherein the obtaining of the cell image comprises:
shooting a battery cell left side skirt edge from the left upper side of the battery cell through a left camera to obtain a battery cell left side image;
shooting a battery cell right skirt edge from the right upper side of the battery cell through a right camera to obtain a battery cell right image, wherein the visual fields of the left camera and the right camera have a crossing region;
and taking the battery cell left side image and the battery cell right side image as battery cell images, or splicing the battery cell left side image and the battery cell right side image to obtain a spliced image, and taking the spliced image as the battery cell image.
3. The glue line defect detecting method of claim 2, wherein the positioning of the cell skirt comprises:
extracting a head edge line, a tail edge line and a side edge line of the skirt edge of the battery cell from the battery cell image;
and calculating the intersection points of the head edge line, the tail edge line and the side edge line of the battery cell skirt edge to obtain the position of the battery cell skirt edge.
4. The glue line defect detection method of claim 3, wherein the identifying of the glue lines of the battery cell comprises:
determining a head area and a tail area of the glue line according to the intersection points of the head edge line and the tail edge line of the battery cell skirt edge and the side edge line;
acquiring a head mass center position according to the head area of the glue line, and determining the head position of the glue line according to the head area of the glue line and the head mass center position;
and acquiring a tail mass center position according to the tail area of the glue line, and determining the tail position of the glue line according to the tail area of the glue line and the tail mass center position.
5. The glue line defect detection method of claim 4, further comprising:
generating a straight line based on the fitting of the position of the mass center of the head, acquiring an intersection point of the straight line and the edge line of the head of the skirt edge of the battery cell, and calculating the distance between the position of the head of the glue line and the intersection point to obtain the distance between the head of the glue line and the head of the skirt edge of the battery cell;
and detecting the initial position of the glue dripping based on the distance between the head of the glue line and the skirt edge of the battery cell.
6. The method for detecting the defect of the glue line according to claim 4, wherein the step of calculating the distance from the glue line to the skirt edge of the battery core and the glue width of the glue line comprises the following steps:
setting a search range of a caliper tool, and setting an initial position and an end position of the caliper tool in the electric core image according to the head position and the tail position of the glue line;
traversing the glue line from the initial position to the end position through a caliper tool, and acquiring the distance from the upper edge and the lower edge of the traversed glue line to the side edge of the skirt edge of the battery cell and the glue width of the glue line.
7. The glue line defect detecting method according to claim 6, wherein when the cell image is the spliced image, setting a start position and an end position of a caliper tool in the cell image according to the head position and the tail position of the glue line comprises:
taking the head part of the glue line as a starting position and the tail part as an ending position;
or, the tail part of the glue line is used as a starting position, and the head part is used as an ending position.
8. The glue line defect detecting method of claim 6, wherein when the cell image includes the left cell image and the right cell image, the setting of the start position and the end position of the caliper tool in the cell image according to the head position and the tail position of the glue line comprises:
for the image on the left side of the electric core, taking the head part of the glue line as an initial position, and taking an intersection point of the glue line and the image edge of the image on the left side of the electric core as an end position;
and regarding the image on the right side of the electric core, taking the tail part of the glue line as an initial position, and taking the intersection point of the glue line and the image edge of the image on the right side of the electric core as an end position.
9. The glue line defect detecting method of claim 2, further comprising:
the method comprises the steps that a left camera and a right camera are calibrated through a calibration block, laser lines in the horizontal direction and the vertical direction are engraved on the left side face and the right side face of the calibration block, and the laser lines are used for determining whether visual field directions and visual field images of the left camera and the right camera are clear or not.
10. The glue line defect detecting method according to claim 9, wherein the stitching the left-side image of the electrical core and the right-side image of the electrical core to obtain a stitched image comprises:
obtaining the mapping relation between the image coordinate systems of the left camera and the right camera to the world coordinate system according to the calibration result obtained by calibrating the left camera and the right camera by the calibration block;
and respectively mapping the battery cell left side image and the battery cell right side image to a world coordinate system according to the mapping relation between the image coordinate system of the left camera and the image coordinate system of the right camera to the world coordinate system for image splicing to obtain spliced images.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117589792A (en) * | 2024-01-18 | 2024-02-23 | 江苏时代新能源科技有限公司 | Ending position detection method, ending position detection device, computer equipment and storage medium |
| CN118706847A (en) * | 2024-08-27 | 2024-09-27 | 厦门软件职业技术学院 | Visual detection-based workpiece appearance detection method and detection equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117589792A (en) * | 2024-01-18 | 2024-02-23 | 江苏时代新能源科技有限公司 | Ending position detection method, ending position detection device, computer equipment and storage medium |
| CN117589792B (en) * | 2024-01-18 | 2024-05-10 | 江苏时代新能源科技有限公司 | Ending position detection method, ending position detection device, computer equipment and storage medium |
| CN118706847A (en) * | 2024-08-27 | 2024-09-27 | 厦门软件职业技术学院 | Visual detection-based workpiece appearance detection method and detection equipment |
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