CN114951015A - Electrode hole column inner wall detection device, detection method and electrode comprehensive detection equipment - Google Patents
Electrode hole column inner wall detection device, detection method and electrode comprehensive detection equipment Download PDFInfo
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Abstract
The invention provides a device and a method for detecting the inner wall of an electrode hole column and comprehensive electrode detection equipment, belonging to the field of battery detection based on machine vision, wherein the device comprises an image acquisition unit, a light source assembly and an image processor; the light source assembly supplies light to the electrode to be detected in a full-covering mode from bottom to top, and the image acquisition unit is arranged obliquely above a streamline of the electrode to be detected and used for acquiring an image of the electrode to be detected containing the inner wall of the middle hole column from top to bottom; the image processor is in telecommunication connection with the image acquisition unit and the light source assembly and is used for controlling image acquisition and image processing, and background judgment is carried out to judge whether a scratch and/or dirty area exists on the inner wall surface of the hole column, so that the working efficiency and the detection quality are improved; the method can be widely applied to the field of detection of power batteries.
Description
Technical Field
The invention belongs to the field of battery detection based on machine vision, and particularly relates to an electrode hole column inner wall detection device, a detection method and electrode comprehensive detection equipment, which can be widely popularized and applied to product detection of an electrode or an end cover of an automobile power battery.
Background
With the environmental deterioration and the application of new energy technology, power batteries are widely applied to electric vehicles, and from 1865, 2170 to 4680, 4695, technological innovation leads to the volume and energy density of the batteries to be improved more and more, and the energy modules of the electric vehicles are further developed and promoted.
With the 4680/4695 power battery, the electrode of the battery (see fig. 1) has been eliminated the battery tab step by step, and the non-tab structure is adopted to reduce or eliminate the heating point, therefore, the cost of the heat control or cooling or heat dissipation system of the automobile is further reduced. However, the quality requirements of the battery end cover without the tab are also correspondingly improved, and the tolerance of burrs, dirt, foreign matters, scratches, pits, bright marks, abnormal colors, metal chips and the like of the battery end cover is further reduced.
In the field of processing technology of battery pole pieces/electrodes, when pole pieces are coated and cut, whether the inner walls of electrode hole columns are scratched or dirty or not needs to be checked, and attention is particularly paid to power batteries. The existing detection method for the flaws on the inner wall of the hole column is to detect the flaws through manual observation, semi-automatic observation and other modes; obviously, the traditional detection scheme can not meet the current high-precision and high-efficiency production requirements, and easily causes the problems of missing detection, wrong parts, instability and the like.
Therefore, the invention aims to find an intelligent detection scheme for the inner wall of the battery electrode hole column, so as to improve the detection precision and efficiency of the battery electrode and ensure the production quality.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an electrode hole column inner wall detection device, a detection method and electrode comprehensive detection equipment, which can solve the problems.
The design principle is as follows: aiming at the electrode, performing hole column inner wall detection based on machine vision, and judging whether a scratch and/or dirty area exists on the inner wall surface of the hole column or not in a background manner through an image algorithm, so that the working efficiency and the detection quality are improved; the overall scheme is as follows.
The electrode hole column inner wall detection device comprises an image acquisition unit, a light source assembly and an image processor; the light source assembly supplies light to the electrode to be detected in a full-covering mode from bottom to top, and the image acquisition unit is arranged obliquely above a streamline of the electrode to be detected and used for acquiring an image of the electrode to be detected, including the inner wall of the middle hole column, from top to bottom; the image processor is in telecommunication connection with the image acquisition unit and the light source assembly and is used for controlling image acquisition and image processing, judging whether the inner wall of the electrode hole column is pressed or not and determining a defect area.
Furthermore, the image acquisition unit comprises a hole column inner wall inspection camera and a hole column inner wall inspection lens which are obliquely arranged relative to the electrode to be detected which is horizontally transmitted, and the light path of the hole column inner wall inspection lens completely covers the hole column upper port which is convex upwards in the middle of the electrode to be detected; the light source component adopts a planar shadowless light source, and the light emitting surface of the light source component completely covers the lower surface of the electrode to be measured; and the electrode to be measured is horizontally transmitted from the right upper part of the planar shadowless light source.
Furthermore, the image acquisition unit comprises a plurality of groups of hole column inner wall inspection cameras and hole column inner wall inspection lenses which are annularly arranged, and the plurality of groups of hole column inner wall inspection cameras and the hole column inner wall inspection lenses are connected to one annular hanging plate in a rotating mode through the camera lens adjusting adapter.
Furthermore, a suspension adapter assembly is arranged above the annular suspension plate to realize suspension of the image acquisition unit; and the plane shadowless light source is connected with the lower rack in a supported manner through the bottom light source adapter.
Further, the annular hanging plate comprises an upper mounting base plate and a lower rotating plate which are coaxially connected and arranged; the camera lens adjusting adapter is used for installing the image acquisition unit to the upper installation substrate; the lower part of the suspension adapter assembly penetrates through the adjustment waist-shaped groove of the upper mounting base plate and then is fixed to the lower rotating plate.
Furthermore, a wiring board is arranged in the middle of the suspension adapter component.
The invention also provides a hole column inner wall detection method according to the electrode hole column inner wall detection device, which comprises the following steps:
s1, acquiring an electrode hole column inner wall image through an image acquisition unit;
s2, carrying out flaw ROI area positioning on the inner wall image of the electrode hole column to obtain a scratch or dirt detection area;
s3, carrying out a dynamic threshold algorithm on the scratch or dirt detection area of the inner wall of the pore pillar to obtain a defect area in the image;
s4, carrying out a feature extraction algorithm on the defect area, and classifying the features through a random forest classification algorithm to obtain a scratch and/or dirty area.
The invention also provides electrode comprehensive detection equipment which comprises a feeding module, a detection receiving platform, a detection station, an NG receiving platform, an OK discharging module, a rack and an industrial controller; the feeding module is arranged at the upstream end of the detection receiving platform; the NG material receiving platform and the OK material discharging module are arranged at the downstream of the detection material receiving platform; the detection stations are annularly arranged along the rotating disc type detection receiving table so as to carry out multi-station comprehensive detection on the battery electrode passing through the detection receiving table, including electrode hole column inner wall flaws, and the industrial controller classifies the detected electrode defects; the NG material receiving platform is provided with a plurality of defect material boxes and corresponding temporary storage material boxes, and receives electrodes with different defect types according to the detection result of the industrial controller; the OK blanking module receives the flawless OK electrode.
Compared with the prior art, the invention has the beneficial effects that: by the electrode hole column inner wall detection device, the detection method and the electrode comprehensive detection equipment, comprehensive detection of various defects including scratch and/or dirt of the inner wall of the hole column of the battery electrode is provided, the problems of high omission factor, low speed and the like caused by manual or semi-automatic detection are avoided, and the electrode hole column inner wall detection device and the detection method can be widely applied to detection of power batteries.
Drawings
FIG. 1 is a schematic diagram of a 4680 cell and its electrodes;
FIGS. 2 to 5 are schematic views of the electrode hole column inner wall detecting device;
FIGS. 6 and 7 are schematic views showing the detection states of the electrode hole column inner wall detection device;
FIG. 8 is a flow chart of a method of inner wall inspection of a well string;
FIG. 9 is a schematic diagram showing the results of detection of the inner wall of the electrode hole column;
fig. 10 is a schematic view of an electrode integrated detecting apparatus.
In the figure:
1. a camera is detected on the inner wall of the hole column;
2. inspecting lenses of the inner walls of the hole columns;
3. a planar shadowless light source;
4. a camera lens adjusting adaptor;
5. an annular hanger plate; 51. an upper mounting substrate; 52. a lower rotating plate;
6. a suspension adapter assembly;
7. a bottom light source adapter;
8. a wiring board is arranged;
100. a feeding module;
200. detecting a receiving platform;
300. a burr detection module;
400. a front side detection module;
500. a back side detection module;
600. an outer ring detection module;
700. an inner wall detection module;
800. an NG material receiving platform;
900. an OK blanking module;
1000. a frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be understood that "device," "apparatus," "unit" and/or "module" as used in this specification is a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, other words may be substituted by other expressions if they accomplish the same purpose.
Flow charts are used in this description to illustrate operations performed by a system according to embodiments of the present description. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, the various steps may be processed in reverse order or simultaneously. Meanwhile, other operations may be added to the processes, or a certain step or several steps of operations may be removed from the processes.
Electrode hole post inner wall detection device
An electrode hole column inner wall detection device, see fig. 2-7, comprises an image acquisition unit, a light source assembly and an image processor.
Arrangement relation: the light source assembly supplies light to the electrode to be detected in a full-covering manner from bottom to top, and the image acquisition unit is arranged obliquely above a streamline of the electrode to be detected and is used for acquiring an image of the electrode to be detected containing the inner wall of the middle hole column from top to bottom; the image processor is in telecommunication connection with the image acquisition unit and the light source assembly and is used for controlling image acquisition and image processing, judging whether the inner wall of the electrode hole column is pressed or not and determining a defect area.
The image acquisition unit comprises a hole column inner wall detection camera 1 and a hole column inner wall detection lens 2 which are obliquely arranged relative to the electrode to be detected which is horizontally transmitted, and the light path of the hole column inner wall detection lens 2 completely covers the hole column upper port which is convex upwards in the middle of the electrode to be detected; the light source component adopts a planar shadowless light source 3, and the light emitting surface of the light source component completely covers the lower surface of the electrode to be measured; the electrode to be measured is horizontally transmitted from the right above the planar shadowless light source 3.
Wherein, the incident inclination angle alpha formed by the incident bottom end surface of the hole column inner wall detection lens 2 and the upper surface of the electrode to be detected is 30-45 degrees. The incidence inclination angle α of the inspection lens 2 on the inner wall of the bore is preferably 40 °.
When the transmitted electrode to be detected cannot be driven to rotate circumferentially, the image acquisition unit adopts a plurality of groups of hole column inner wall inspection cameras 1 and hole column inner wall inspection lenses 2 which are circumferentially and annularly arranged; preferably six groups.
When the transmitted electrode to be detected is driven to rotate in the circumferential direction at the detection position, the image acquisition unit adopts one or more groups of hole column inner wall detection cameras 1 and hole column inner wall detection lenses 2 which are circumferentially and annularly arranged. The inner wall inspection camera 1 of the hole column adopts a black and white camera.
The image acquisition unit comprises a plurality of groups of hole column inner wall inspection cameras 1 and hole column inner wall inspection lenses 2 which are annularly arranged, and the plurality of groups of hole column inner wall inspection cameras 1 and the hole column inner wall inspection lenses 2 are switched to an annular hanging plate 5 through a camera lens adjusting and switching piece 4.
Further, the image acquisition unit adjusts the spatial position and the incidence inclination angle alpha of the inner wall inspection camera 1 and the inner wall inspection lens 2 of the hole column through the camera lens adjusting adapter 4. The camera lens adjusting adaptor 4 comprises a plurality of adaptor blocks provided with adjusting grooves, and is L-shaped as a whole.
Further, a suspension adapter assembly 6 is arranged above the annular suspension plate 5 to realize suspension of the image acquisition unit; the planar shadowless light source 3 is connected with the lower frame in a supported mode through a bottom light source adapter 7.
Wherein, the annular hanger plate 5 comprises an upper mounting base plate 51 and a lower rotating plate 52 which are coaxially connected and arranged; the camera lens adjustment adaptor 4 mounts the image pickup unit to the upper mounting substrate 51; the lower part of the suspension adapter assembly 6 passes through the adjustment waist-shaped groove of the upper mounting base plate 51 and is fixed on the lower rotating plate 52.
Further, a wiring board 8 is arranged in the middle of the suspension adapter assembly 6.
Hole column inner wall detection method
A method for detecting the inner wall of a well column according to the electrode well column inner wall detection device, referring to fig. 8, the method comprises the following steps:
s1, acquiring an electrode hole column inner wall image through an image acquisition unit; specifically, the inner wall image of the hole column of the electrode to be measured is obtained through six groups of black and white cameras.
And S2, carrying out defect ROI area positioning on the inner wall image of the electrode hole column to obtain a scratch or dirt detection area.
And S3, performing a dynamic threshold algorithm on the scratch or dirt detection area of the inner wall of the pore pillar to obtain a defect area in the image.
S4, carrying out a feature extraction algorithm on the defect area, and classifying the features through a random forest classification algorithm to obtain a scratch and/or dirty area.
Referring to fig. 9, which is a comparative image of the image detected by the above-described method for the electrode, fig. 9a is a perfect OK image without a defect, fig. 9b is a defect image in which the inner wall of the electrode hole pillar is scratched, and fig. 9c is a defect image in which the inner wall of the electrode hole pillar is stained.
Electrode comprehensive detection equipment
An electrode comprehensive detection device, referring to fig. 10, the device comprises a feeding module 100, a detection receiving platform 200, detection stations (300, 400, 500, 600, 700), an NG receiving platform 800, an OK discharging module 900, a rack 1000 and a industrial controller (not shown).
Arrangement relation: the feeding module 100 is arranged at the upstream end of the detection receiving platform 200; the NG receiving platform 800 and the OK blanking module 900 are disposed downstream of the detecting receiving platform 200. The detection stations (300, 400, 500, 600 and 700) are annularly arranged along the rotating disc type detection receiving table 200 so as to carry out multi-station comprehensive detection on the battery electrodes flowing through the detection receiving table 200, including defects of the inner wall of the electrode hole column, and the industrial controller classifies the detected electrode defects; the NG material receiving platform 800 is provided with a plurality of defect material boxes and corresponding temporary storage material boxes, and receives electrodes with different defect types according to the detection result of the industrial controller; the OK blanking module 900 receives an OK electrode without defects.
Wherein, the detection station (300, 400, 500, 600, 700) comprises a burr detection module 300, a front detection module 400, a back detection module 500, an outer ring detection module 600 and an inner wall detection module 700 which are arranged according to the streamline of the detection receiving platform 200. The functions of the modules are as follows.
The burr detection module 300 performs burr detection on the electrode.
The front detection module 400 uses coaxial light and low-angle ring light to detect the appearance defects of the front of the electrode.
The backside detection module 500 employs coaxial light and low-angle ring light to detect the appearance defects on the backside of the electrode.
The outer ring detection module 600 is used for detecting the crush flaw of the outer ring of the electrode.
The inner wall detection module 700 adopts the electrode hole column inner wall detection device and obtains an image of a scratch and/or stain defect area of the inner wall of the electrode hole column according to the hole column inner wall detection method.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 invention.
Claims (10)
1. The utility model provides an electrode hole post inner wall detection device which characterized in that: the electrode hole column inner wall detection device comprises an image acquisition unit, a light source assembly and an image processor;
wherein, the light source component supplies light to the electrode to be measured, which is covered from bottom to top; the image acquisition unit is arranged obliquely above a streamline of the electrode to be detected and is used for acquiring an image of the inner wall of the middle hole column of the electrode to be detected from the upper part obliquely downwards;
the image processor is in telecommunication connection with the image acquisition unit and the light source assembly and is used for controlling image acquisition and image processing, judging whether the inner wall of the electrode hole column is pressed or not and determining a defect area.
2. The electrode hole column inner wall detection device according to claim 1, wherein: the image acquisition unit comprises a hole column inner wall inspection camera (1) and a hole column inner wall inspection lens (2) which are obliquely arranged relative to the electrode to be detected and horizontally transmitted, and the light path of the hole column inner wall inspection lens (2) completely covers the hole column upper port which is convex upwards in the middle of the electrode to be detected; the light source component adopts a planar shadowless light source (3), and the light emitting surface of the light source component completely covers the lower surface of the electrode to be measured; the electrode to be measured is horizontally transmitted from the position right above the planar shadowless light source (3).
3. The electrode hole column inner wall detection device according to claim 2, wherein: and an incident inclination angle alpha formed by the incident bottom end surface of the hole column inner wall inspection lens (2) and the upper surface of the electrode to be detected is 30-45 degrees.
4. The electrode hole column inner wall detection device according to claim 2, wherein: the image acquisition unit comprises a plurality of groups of hole column inner wall inspection cameras (1) and hole column inner wall inspection lenses (2) which are annularly arranged, and the plurality of groups of hole column inner wall inspection cameras (1) and the hole column inner wall inspection lenses (2) are switched to one annular hanging plate (5) through a camera lens adjusting and switching piece (4).
5. The electrode hole column inner wall detection device according to claim 4, wherein: a suspension adapter assembly (6) is arranged above the annular hanging plate (5) to realize suspension of the image acquisition unit; the planar shadowless light source (3) is connected with the lower rack in a supported mode through a bottom light source adapter (7).
6. The electrode hole column inner wall detection device according to claim 5, wherein: the annular hanging plate (5) comprises an upper mounting base plate (51) and a lower rotating plate (52) which are coaxially connected and arranged; a camera lens adjustment adaptor (4) mounts an image capture unit to the upper mounting substrate (51); the lower part of the suspension adapter component (6) passes through the adjusting waist-shaped groove of the upper mounting base plate (51) and then is fixed on the lower rotating plate (52).
7. The electrode hole column inner wall detection device according to claim 5, wherein: and a wiring board (8) is arranged in the middle of the suspension adapter component (6).
8. A method for detecting the inner wall of a well column of the electrode well column inner wall detection device according to any one of claims 1 to 7, wherein the method comprises the following steps:
s1, acquiring an electrode hole column inner wall image through an image acquisition unit;
s2, carrying out flaw ROI area positioning on the inner wall image of the electrode hole column to obtain a scratch or dirt detection area;
s3, carrying out a dynamic threshold algorithm on the scratch or dirt detection area of the inner wall of the pore pillar to obtain a defect area in the image;
s4, carrying out a feature extraction algorithm on the defect area, and classifying the features through a random forest classification algorithm to obtain a scratch and/or dirty area.
9. An electrode comprehensive testing device is characterized in that: the device comprises a feeding module (100), a detection receiving platform (200), a detection station (300, 400, 500, 600, 700), an NG receiving platform (800), an OK discharging module (900), a rack (1000) and an industrial controller;
the feeding module (100) is arranged at the upstream end of the detection receiving platform (200); the NG material receiving platform (800) and the OK material discharging module (900) are arranged at the downstream of the detection material receiving platform (200);
the detection stations (300, 400, 500, 600 and 700) are annularly arranged along the rotating disc type detection receiving table (200) so as to carry out multi-station comprehensive detection including electrode hole column inner wall flaws on the battery electrodes flowing through the detection receiving table (200), and the industrial controller classifies the detected electrode defects;
the NG material receiving table (800) is provided with a plurality of defect material boxes and corresponding temporary storage material boxes, and receives electrodes with different defect types according to the detection result of the industrial controller;
the OK blanking module (900) receives the flawless OK electrode.
10. The electrode comprehensive detecting apparatus according to claim 9, characterized in that: the detection station (300, 400, 500, 600, 700) comprises a burr detection module (300), a front detection module (400), a back detection module (500), an outer ring detection module (600) and an inner wall detection module (700) which are arranged according to the flow line of the detection receiving platform (200); wherein the content of the first and second substances,
the burr detection module (300) detects burrs of the electrode;
the front detection module (400) detects the appearance defects of the front of the electrode by adopting coaxial light and low-angle annular light;
the back detection module (500) adopts coaxial light and low-angle ring light to detect the appearance flaws of the back of the electrode;
the outer ring detection module (600) is used for detecting the crush flaw of the outer ring of the electrode;
the inner wall detection module (700) adopts the electrode hole column inner wall detection device according to any one of claims 1 to 7, and obtains an image of a scratched and/or dirty defect area of the inner wall of the electrode hole column according to the hole column inner wall detection method according to claim 8.
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| CN114378006A (en) * | 2022-01-11 | 2022-04-22 | 广东国顺隆电子科技有限公司 | Full-automatic checking and testing device for annular piezoresistor |
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Application publication date: 20220830 |