CN113640304B - Welding detection device and method for sealing nails of power battery - Google Patents
Welding detection device and method for sealing nails of power battery Download PDFInfo
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- CN113640304B CN113640304B CN202110915479.1A CN202110915479A CN113640304B CN 113640304 B CN113640304 B CN 113640304B CN 202110915479 A CN202110915479 A CN 202110915479A CN 113640304 B CN113640304 B CN 113640304B
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- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 238000003466 welding Methods 0.000 title claims abstract description 33
- 238000007789 sealing Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 18
- 238000012545 processing Methods 0.000 claims abstract description 33
- 230000007704 transition Effects 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 239000011324 bead Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/296—Synchronisation thereof; Control thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
Abstract
The device comprises an image acquisition part and an image processing part, wherein the image acquisition part comprises a 3D camera, a motion assembly, a support frame and a base, the motion assembly is driven to rotate and move by the 3D camera, the support frame is used for supporting the motion assembly, the support frame and a battery for detection are fixed on the base, the 3D camera scans the battery to be detected for a plurality of times under the action of the motion assembly, and the image processing part is connected with the data end of the 3D camera and is used for processing the scanned image. According to the invention, by adopting the 3D camera for detection, the detection of the welding protrusion height and the concave depth of the sealing nail can be realized.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a welding detection device and method for a sealing nail of a power battery.
Background
At present, after the liquid injection of the lithium ion battery is finished, a liquid injection port is sealed in a mode of welding sealing nails to avoid liquid leakage, and the welding effect becomes an industrial difficulty at present. In order to detect the welding effect of the sealing nail, a 2D area array camera is generally used for detection, but the detection efficiency is not ideal, the process requirement cannot be met, and part of manufacturers adopt a 3D camera for detection, but the detection effect still cannot meet the requirement, mainly, when the 3D camera detects, due to the fact that a groove exists on the inner side of a welding bead of the sealing nail, abnormal refraction of a laser light path of the 3D camera is caused, so that raised noise on a height image is caused, misjudgment is easy to occur in detection, and the production qualification rate is seriously influenced; secondly, the unqualified products are easily misjudged as qualified products, and the unqualified products flow into the next working procedure to cause battery leakage, so that serious potential safety hazards exist.
Disclosure of Invention
In order to solve the problem of misjudgment caused by image projection noise in the detection of the existing 3D camera after sealing nail welding caused by abnormal refraction of a laser light path, the invention provides a device and a method for detecting the sealing nail welding of a power battery, which specifically adopts the following scheme:
the utility model provides a power battery seals nail welding detection device, includes image acquisition part and image processing part, image acquisition part includes 3D camera, drives motion subassembly, support frame, the base of 3D camera rotation and removal, the support frame is used for supporting motion subassembly, the support frame is fixed on the base with the battery that is used for detecting, the 3D camera carries out a lot of scanning to the battery that treats the detection under the effect of motion subassembly, image processing part is connected with the data end of 3D camera and is used for handling the image after the scanning.
Specifically, the motion assembly comprises a rotation unit and a horizontal movement unit, wherein the rotation unit comprises a rotation cylinder fixed on a transition plate, and the rotation cylinder drives a camera to rotate; the horizontal moving unit comprises a servo module fixed on the support frame, the transition plate is fixed on the servo module, and one side of the servo module is provided with a servo motor for driving the servo module to reciprocate on the support frame.
Specifically, the servo module is provided with limiting pieces at two sides of the movement direction respectively, and the transition plate is provided with limiting stops which can shade the corresponding limiting pieces.
Specifically, the 3D camera rotation axis is located on a midpoint vertical line of the fixed battery to be detected.
Specifically, the 3D camera is fixed on the camera fixing plate, and the rotary cylinder drives the camera fixing plate and the 3D camera to rotate.
The method for using the power battery sealing nail welding detection device comprises the following steps:
s1, placing a battery on a corresponding position of a base, driving a 3D camera on a transition plate to horizontally move from a first station by a servo motor, moving from a point A side of battery seal welding corresponding to the first station to a point B side corresponding to a second station, and processing after obtaining a first group of data from the 3D camera by an image processing part, wherein the data corresponds to one side of a seal nail of the battery;
s2, the rotary air cylinder works, so that the 3D camera rotates 180 degrees, the other side edge of the sealing nail of the battery is detected, the servo motor moves from the second station to the first station, and the image processing part obtains a second group of data from the 3D camera and then processes the second group of data;
s3, integrating the first group of data and the second group of data by the image processing part to form a detected third group of images;
s4, the image processing part analyzes the third group of images and outputs detection data to the PLC;
and S5, the PLC judges whether the corresponding battery is an OK battery flow according to the detection data, so as to judge whether the battery is qualified in the detection.
The invention has the beneficial effects that:
1. according to the invention, by adopting the 3D camera for detection, the detection of the welding protrusion height and the concave depth of the sealing nail can be realized.
2. The method and the device can effectively avoid image projection noise of the 3D camera laser caused by light path refraction, so that the image is clearer.
3. The method and the device can greatly improve the detection efficiency, reduce manual rechecking and reduce the production cost. In addition, the welding detection qualification rate of the sealing nails can be improved, the consistency of the product quality is improved, and the accuracy of the detection effect is also improved, so that the detection precision is improved.
Drawings
Fig. 1 and fig. 2 are block diagrams of a welding detection device for sealing nails of power batteries.
FIG. 3 is a flow chart of the method of the present invention.
The left side of fig. 4 is a normal area diagram of the point B where the interference area seal nail 91 is welded obtained by the first scanning detection, and the right side is a normal area diagram of the point a where the interference area seal nail 91 is welded obtained by the second scanning detection.
Fig. 5 is a flowchart of the analysis step in step S4.
1. A 3D camera; 2. a rotary cylinder; 3. a transition plate; 4. a servo module; 41. left limit; 42. limiting on the right; 43. a limit stop; 5. a servo motor; 6. a camera fixing plate; 7. a support frame; 8. a computer; 9. a battery; 91. sealing nails; 10. base seat
Detailed Description
As shown in fig. 1-2, the welding detection device for the sealing nail of the power battery comprises an image acquisition part and an image processing part, wherein the image acquisition part comprises a 3D camera 1, a motion assembly for driving the 3D camera 1 to rotate and move, a support frame 7 and a base 10, the support frame 7 is used for supporting the motion assembly, the support frame 7 and a battery 9 for detection are fixed on the base 10, and the 3D camera 1 scans the battery 9 to be detected for multiple times under the action of the motion assembly to realize the defect detection of welding beads. The image processing part is connected with the data end of the 3D camera 1 and is used for processing the scanned image.
Specifically, the motion assembly includes a rotation unit including a rotation cylinder 2 fixed on a transition plate 3, and a horizontal movement unit, the rotation cylinder 2 driving the camera to rotate. Preferably, the 3D camera 1 is fixed on the camera fixing plate 6, and the rotary cylinder 2 drives the camera fixing plate 6 and the 3D camera 1 to rotate.
The horizontal moving unit comprises a servo module 4 fixed on a support frame 7, the transition plate 3 is fixed on the servo module 4, one side of the servo module 4 is provided with a servo motor 5 for driving the servo module 4 to reciprocate on the support frame 7, two sides of the servo module 4 in the moving direction are respectively provided with a limiting piece, and the transition plate 3 is provided with a limit stop 43 for limiting the movement of the servo module 4 to exceed a detection range. Specifically, during the movement of the servo module 4, the limit stop 43 will follow the movement, and when the servo module 4 encounters the right limit 42 or the left limit 41, the movement of the servo module 4 will be stopped, so as to avoid the movement position of the servo module 4 exceeding the limit range.
The rotation axis of the 3D camera 1 is located on the middle vertical line of the battery 9 to be detected after being fixed, so that after the 3D camera 1 is rotated by the rotating unit, the 3D camera 1 can obtain images on the front and rear semicircular surfaces of the sealing nail 91.
The servo motor 5, the controlled end of the rotary cylinder 2 and the signal end of the limiting piece are all connected through a computer 8, and the image processing part is also positioned in a program of the computer 8.
The image processing part is connected with the data output end of the 3D camera 1.
As shown in fig. 3, the method corresponding to the apparatus specifically includes the following steps:
s1, placing a battery 9 on a corresponding position of a base 10, driving a 3D camera 1 on a transition plate 3 to horizontally move from a first station by a servo motor 5, moving from an A point side of battery 9 seal welding corresponding to the first station to a B point side corresponding to a second station, and processing after obtaining a first group of data from the 3D camera 1 by an image processing part, wherein the data corresponds to the data of the sealing nail 91 side of the battery 9;
s2, the rotary cylinder 2 works, so that the 3D camera 1 rotates 180 degrees, the other side edge of the sealing nail 91 of the battery 9 is detected, the servo motor 5 moves from the second station to the first station, and the image processing part obtains a second group of data from the 3D camera 1 and then processes the second group of data;
s3, integrating the first group of data and the second group of data by the image processing part to form a detected third group of images;
s4, the image processing part analyzes the third group of images and outputs detection data to the PLC;
the analysis steps are as shown in fig. 5, firstly, a 3D image is obtained, then, welding contour height data in the image is extracted, a welding track reference plane is determined according to a laser cleaning area, convex and concave technological parameters are set, the image is intercepted according to the technological parameters by taking the reference plane as the center, the convex image and the concave image are obtained, then, the convex image and the concave image are converted into gray level images, the image is processed by using a Blob algorithm, an area which is larger than the technological process is selected, data is obtained, and finally, actual data is displayed in an NG area.
S5, the PLC judges whether the corresponding battery 9 is in an OK battery 9 flow according to the detection data, so as to judge whether the battery 9 is qualified in the detection.
The invention realizes the welding quality detection of the sealing nail 91 by a 3D camera 1 imaging technology, and the core is that a single camera twice scanning mode is adopted to realize the welding bead defect detection; as shown in fig. 4, in order to thoroughly solve the interference of the noise area to the detection, the present scheme adopts a two-time scanning detection mode, wherein the first scanning detection obtains the normal area of the point B welded by the sealing nail 91 except for the interference area, the second scanning detection obtains the normal area of the point a welded by the sealing nail 91 except for the interference area, and the two images are combined to complete the complete weld bead defect detection image; the software algorithm determines a welding track reference plane according to the laser cleaning area, the software respectively sets a judging high threshold value and a judging low threshold value, the software carries out height calculation on the circular ring welding track detection area, the area which is judged to be higher than the high threshold value is marked as an NG area, the area which is judged to be lower than the low threshold value is marked as an NG area, in order to reduce the misjudgment rate, the software algorithm supports screening of the area and the depth of the defect area, and the reasonable parameters can be set to brush out the area which does not reach the standard or the depth which does not reach the standard.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The power battery sealing nail welding detection device is characterized by comprising an image acquisition part and an image processing part, wherein the image acquisition part comprises a 3D camera, a motion assembly for driving the 3D camera to rotate and move, a support frame and a base, the support frame is used for supporting the motion assembly, the support frame and a battery for detection are fixed on the base, the 3D camera scans the battery to be detected for a plurality of times under the action of the motion assembly, and the image processing part is connected with a data end of the 3D camera and is used for processing the scanned image;
the method of the detection device comprises the steps of:
s1, placing a battery on a corresponding position of a base, driving a 3D camera on a transition plate to horizontally move from a first station by a servo motor, moving from a point A side of battery seal welding corresponding to the first station to a point B side corresponding to a second station, and processing after obtaining a first group of data from the 3D camera by an image processing part, wherein the data corresponds to one side of a seal nail of the battery;
s2, the rotary air cylinder works, so that the 3D camera rotates 180 degrees, the other side edge of the sealing nail of the battery is detected, the servo motor moves from the second station to the first station, and the image processing part obtains a second group of data from the 3D camera and then processes the second group of data;
s3, integrating the first group of data and the second group of data by the image processing part to form a detected third group of images;
s4, the image processing part analyzes the third group of images and outputs detection data to the PLC;
and S5, the PLC judges whether the corresponding battery is an OK battery flow according to the detection data, so as to judge whether the battery is qualified in the detection.
2. The power battery sealing nail welding detection device according to claim 1, wherein the movement assembly comprises a rotation unit and a horizontal movement unit, the rotation unit comprises a rotation cylinder fixed on a transition plate, and the rotation cylinder drives a camera to rotate; the horizontal moving unit comprises a servo module fixed on the support frame, the transition plate is fixed on the servo module, and one side of the servo module is provided with a servo motor for driving the servo module to reciprocate on the support frame.
3. The welding detection device for the sealing nails of the power battery according to claim 2, wherein limiting pieces are respectively arranged on two sides of the servo module in the moving direction, and limiting stops which can shade the corresponding limiting pieces are arranged on the transition plates.
4. The welding detection device for the sealing nails of the power battery according to claim 2, wherein the rotation shaft of the 3D camera is positioned on a midvertical line of the fixed battery to be detected.
5. The power battery sealing nail welding detection device according to claim 1, wherein the 3D camera is fixed on a camera fixing plate, and the rotary cylinder drives the camera fixing plate and the 3D camera to rotate.
6. A method of using a power cell seal nail welding inspection device according to any one of claims 2-5, comprising the steps of:
s1, placing a battery on a corresponding position of a base, driving a 3D camera on a transition plate to horizontally move from a first station by a servo motor, moving from a point A side of battery seal welding corresponding to the first station to a point B side corresponding to a second station, and processing after obtaining a first group of data from the 3D camera by an image processing part, wherein the data corresponds to one side of a seal nail of the battery;
s2, the rotary air cylinder works, so that the 3D camera rotates 180 degrees, the other side edge of the sealing nail of the battery is detected, the servo motor moves from the second station to the first station, and the image processing part obtains a second group of data from the 3D camera and then processes the second group of data;
s3, integrating the first group of data and the second group of data by the image processing part to form a detected third group of images;
s4, the image processing part analyzes the third group of images and outputs detection data to the PLC;
and S5, the PLC judges whether the corresponding battery is an OK battery flow according to the detection data, so as to judge whether the battery is qualified in the detection.
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| CN202110915479.1A CN113640304B (en) | 2021-08-10 | 2021-08-10 | Welding detection device and method for sealing nails of power battery |
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| CN202110915479.1A CN113640304B (en) | 2021-08-10 | 2021-08-10 | Welding detection device and method for sealing nails of power battery |
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| CN113640304B true CN113640304B (en) | 2024-03-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114113144A (en) * | 2022-01-26 | 2022-03-01 | 武汉逸飞激光股份有限公司 | Device and method for detecting welding quality of sealing nail |
| CN115823412B (en) * | 2022-08-26 | 2023-11-17 | 宁德时代新能源科技股份有限公司 | Detection device, method, computer device, storage medium, and program product |
| CN117571723A (en) * | 2024-01-16 | 2024-02-20 | 宁德时代新能源科技股份有限公司 | Method and system for detecting battery welding slag |
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