CN114740001A - Lithium battery pole piece size detection device and method - Google Patents
Lithium battery pole piece size detection device and method Download PDFInfo
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- CN114740001A CN114740001A CN202210398167.2A CN202210398167A CN114740001A CN 114740001 A CN114740001 A CN 114740001A CN 202210398167 A CN202210398167 A CN 202210398167A CN 114740001 A CN114740001 A CN 114740001A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The application provides a lithium battery pole piece size detection device and a method, wherein the device comprises an imaging system, a light source system and a control system; the imaging system is used for acquiring small cell images of the battery cell to be tested; the light source system is used for providing an illumination light source for the imaging system; the control system is in communication connection with the imaging system and is used for receiving the small unit image of the battery cell to be tested; correspondingly processing and analyzing the small cell image of the battery cell to be detected according to different detection items, and judging whether the small cell image of the battery cell to be detected is unqualified in size; the control system is in communication connection with the light source system and is used for controlling the on-off of the light source system. When light source system shines the electric core cell that awaits measuring in this application, the positive plate that awaits measuring is in light source system's illumination face, and the negative pole piece that awaits measuring is in light source system's shady face, and the negative pole piece image that awaits measuring of gathering the shady face through second acquisition mechanism can realize penetrating two-layer diaphragm and imaging to the negative pole piece that awaits measuring to the contrast of the negative pole piece image that awaits measuring that obtains is higher, the edge is more clear.
Description
Technical Field
The application relates to the technical field of lithium battery detection, in particular to a device and a method for detecting the size of a lithium battery pole piece.
Background
Electrode sheets are important components in lithium batteries. In the pole piece lamination process, if the distance between the edge of the anode piece and the edge of the cathode piece, the distance between the edge of the anode piece and the edge of the diaphragm, the distance between the edge of the cathode piece and the diaphragm, and the like are not in a qualified range, the situations of electric leakage or battery explosion and the like may occur in the subsequent liquid injection process. Therefore, the size detection device is required to detect the size of the lithium battery pole piece.
In the prior art, a lithium battery pole piece size detection device is provided, as shown in fig. 1, the device includes: the system comprises a first area-array camera, a second area-array camera, a first light source, a second light source, a third light source and a controller (not shown in the figure), wherein the first area-array camera is arranged above one side of a small unit of the electric core to be detected; the second area-array camera and the first area-array camera are arranged above the same side of the small cell of the battery cell to be tested and are arranged in parallel; the first light source, the second light source and the third light source are all arranged between the small cell of the electric core to be tested and the two area-array cameras, the first light source is used for irradiating the top end of the small cell of the electric core to be tested, the second light source is used for irradiating the left side of the small cell of the electric core to be tested, and the third light source is used for irradiating the right side of the small cell of the electric core to be tested; the controller is in communication connection with the two area-array cameras and the three light sources, the controller is used for analyzing and processing the images of the small unit of the electric core to be detected transmitted by the two area-array cameras, and the controller is used for controlling the on-off of the three light sources.
However, in the above technical solution, the negative plate images of the small cell images of the battery cell to be measured need to be obtained through imaging through a layer of diaphragm, and part of the negative plate images are as shown in fig. 2. Since the diaphragm is white, the area light of the diaphragm after being irradiated by the light source is reflected to the lens of the area array camera, and the lens captures a part of the negative plate image as shown in fig. 2. As can be seen from fig. 2, the edge of the negative plate image is imaged in a fuzzy manner, the contrast is not high, and the controller is difficult to grasp the negative plate image, so that the size detection result of the negative plate is inaccurate, and the misjudgment rate is high.
Disclosure of Invention
The application provides a lithium battery pole piece size detection device and method, which are used for solving the problems that in the prior art, the edge imaging of a negative pole piece image is fuzzy, the contrast is not high, and the controller is difficult to grasp the negative pole piece image, so that the size detection result of the negative pole piece is inaccurate, and the misjudgment rate is high.
In a first aspect, the present application provides a lithium battery pole piece size detection apparatus, including: an imaging system, a light source system and a control system;
the imaging system is used for acquiring small cell images of the battery cell to be tested;
the light source system is used for providing an illumination light source for the imaging system;
the control system is in communication connection with the imaging system and is used for:
receiving a small unit image of the battery cell to be detected transmitted by the imaging system;
correspondingly processing and analyzing the small cell image of the battery cell to be detected according to different detection items, and judging whether the small cell image of the battery cell to be detected has unqualified size;
the control system is in communication connection with the light source system and is used for controlling the on-off of the light source system;
the small cell image of the battery cell to be detected comprises an image of a positive plate to be detected and an image of a negative plate to be detected, the image of the positive plate to be detected is acquired through an imaging system on an illumination surface of a light source system, and the image of the negative plate to be detected is acquired through the imaging system on a backlight surface of the light source system.
In a preferred embodiment of the present application, the imaging system includes a first acquisition mechanism and a second acquisition mechanism, the first acquisition mechanism is disposed above one side of the small cell of the electrical core to be tested, and a light source system is disposed between the first acquisition mechanism and the small cell of the electrical core to be tested; the second acquisition mechanism is arranged below one side of the small cell of the battery cell to be detected and is arranged in parallel with the first acquisition mechanism;
the first acquisition mechanism comprises a first area-array camera and a second area-array camera, the first area-array camera is arranged above one side of the small cell of the battery cell to be detected, the second area-array camera is arranged above the same side of the small cell of the battery cell to be detected, and the center of the second area-array camera and the center of the first area-array camera are positioned on the same horizontal line;
the second acquisition mechanism comprises a third array camera and a fourth array camera, the third array camera is arranged below one side of the small cell of the battery cell to be detected, the fourth array camera is arranged below the same side of the small cell of the battery cell to be detected, and the center of the fourth array camera and the center of the third array camera are positioned on the same horizontal line.
In a preferred embodiment of the application, the light source system includes a first light source, a second light source and a third light source, and the first light source, the second light source and the third light source are all arranged between the small cell of the electrical core to be tested and the first acquisition mechanism and are arranged on the same side as the first acquisition mechanism;
the first light source is used for irradiating the top end of the small cell of the battery cell to be tested, the second light source is used for irradiating the left side of the small cell of the battery cell to be tested, and the third light source is used for irradiating the right side of the small cell of the battery cell to be tested.
In a preferred embodiment of the present application, the imaging system includes a first collecting mechanism, the first collecting mechanism is disposed above one side of the small cell of the electrical core to be tested, and a light source system is disposed between the first collecting mechanism and the small cell of the electrical core to be tested;
the first acquisition mechanism comprises a first area-array camera and a second area-array camera, the first area-array camera is arranged above one side of the small cell of the battery cell to be detected, the second area-array camera is arranged above the same side of the small cell of the battery cell to be detected, and the center of the second area-array camera and the center of the first area-array camera are located on the same horizontal line.
In a preferred embodiment of the present application, the light source system includes a first light source, a second light source, a third light source, and a fourth light source, where the first light source, the second light source, and the third light source are all disposed between the small cell of the electrical core to be tested and the first collecting mechanism, and are disposed on the same side as the first collecting mechanism, and the fourth light source is disposed below the small cell of the electrical core to be tested, and is disposed in parallel with the same side of the first collecting mechanism;
the first light source is used for irradiating the top end of the small cell of the battery cell to be detected, the second light source is used for irradiating the left side of the small cell of the battery cell to be detected, the third light source is used for irradiating the right side of the small cell of the battery cell to be detected, and the fourth light source is used for irradiating the lower side of the small cell of the battery cell to be detected.
In a preferred embodiment of the present application, what all adopted by the first light source, the second light source, the third light source and the fourth light source is a bar light source, the first light source, the second light source and the third light source are all 45 ° oblique incidence on the positive plate to be tested of the small cell of the electric core to be tested, and the fourth light source is 45 ° oblique incidence on the negative plate to be tested of the small cell of the electric core to be tested.
In a second aspect, the present application provides a method for detecting a size of a lithium battery pole piece, including the following steps: acquiring at least two small unit images of the battery cell to be detected, wherein the at least two small unit images of the battery cell to be detected are acquired by at least two area-array cameras;
extracting at least two boundary lines of at least two small unit images of the battery cell to be tested under an image coordinate system;
calibrating the at least two area-array cameras according to different detection items to obtain at least two boundary lines under a world coordinate system;
calculating corresponding detection item values according to the distance between at least two boundary lines;
comparing the detection item value with a corresponding detection item threshold value;
and judging whether the small cell of the battery cell to be detected has unqualified size or not according to the comparison result and outputting a judgment result.
In a preferred embodiment of the present application, calibrating at least two area-array cameras according to different detection items to obtain at least two boundary lines in a world coordinate system includes:
and converting the image coordinates of all the pixel points on the at least two boundary lines into corresponding physical coordinates under a world coordinate system to obtain at least two boundary lines under the world coordinate system.
In a third aspect, the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for detecting the size of a lithium battery pole piece when executing the computer program.
In a fourth aspect, the present application provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of the method for detecting the size of a lithium battery pole piece.
Compared with the prior art, the lithium battery pole piece size detection device and method provided by the application have the following beneficial effects:
when light source system shines the electric core cell that awaits measuring in this application, the positive plate that awaits measuring is in light source system's illumination surface, the negative plate that awaits measuring is in light source system's backlight face, the positive plate image that awaits measuring of illumination surface is gathered through first acquisition mechanism, the negative plate image that awaits measuring of backlight face is gathered through second acquisition mechanism, can realize piercing through two-layer diaphragm and form images to the negative plate that awaits measuring, and the contrast of the negative plate image that awaits measuring that obtains is higher, the edge is more clear.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a lithium battery pole piece size detection device in the prior art;
FIG. 2 is a schematic view of a portion of a negative plate image taken using a prior art apparatus;
fig. 3 is a schematic structural diagram of a cell small unit;
fig. 4 is a schematic structural diagram of a cell small unit containing all detection items;
fig. 5 is a block diagram of a structure of a lithium battery pole piece size detection apparatus in embodiment 1 of the present application;
fig. 6 is a schematic structural diagram of a lithium battery pole piece size detection apparatus in embodiment 1 of the present application;
FIG. 7 is a schematic structural diagram of a lithium battery electrode plate size detection device in example 1 of the present application;
fig. 8 is a schematic structural diagram of another lithium battery pole piece size detection apparatus in embodiment 1 of the present application;
fig. 9 is a flowchart of a method for detecting the size of a lithium battery pole piece in embodiment 2 of the present application;
fig. 10 is a schematic diagram of the first positive electrode sheet to be measured after the border line is marked;
FIG. 11 is a schematic diagram of the second positive plate to be tested after the border line is marked by the image;
FIG. 12 is a schematic diagram of the first to-be-tested negative plate after marking the boundary lines;
FIG. 13 is a schematic diagram of the second negative electrode sheet to be tested after marking the boundary line;
fig. 14 is a schematic diagram of a first positive electrode plate to be measured image acquired by the first area-array camera;
fig. 15 is a schematic diagram of a second to-be-detected positive plate image acquired by the second area-array camera;
fig. 16 is a schematic diagram of a first to-be-detected negative plate image collected by the third array camera;
fig. 17 is a schematic view of a second to-be-detected negative plate image acquired by the fourth array camera;
description of reference numerals:
1-an imaging system, 10-a first acquisition mechanism, 100-a first area-array camera, 101-a second area-array camera, 11-a second acquisition mechanism, 110-a third area-array camera, 111-a fourth area-array camera, 12-a small cell of a cell to be detected, 120-a positive plate to be detected, 121-a diaphragm, 122-a negative plate to be detected; 2-a light source system, 20-a first light source, 21-a second light source, 22-a third light source, 23-a fourth light source; and 3, controlling the system.
Detailed Description
To make the objects, embodiments and advantages of the present application clearer, the following description of exemplary embodiments of the present application will clearly and completely describe the exemplary embodiments of the present application with reference to the accompanying drawings in the exemplary embodiments of the present application, and it is to be understood that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
All other embodiments, which can be derived by a person skilled in the art from the exemplary embodiments described herein without inventive step, are intended to be within the scope of the claims appended hereto. In addition, while the disclosure herein has been presented in terms of one or more exemplary examples, it should be appreciated that aspects of the disclosure may be implemented solely as a complete embodiment.
It should be noted that the brief descriptions of the terms in the present application are only for convenience of understanding of the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.
In order to facilitate the technical solution of the present application, some concepts related to the present application will be described below.
In this application, terms such as "first," "second," "third," and "fourth," are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In addition, the terms "comprises," "comprising," "also includes," "for," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that it includes not only the elements explicitly listed, but also other elements not explicitly listed. Thus, the solution of the present application is not unclear. Moreover, the words "upper", "lower", "left", "right", "inner", "outer", "top", and the like in this application describe the orientation of the product as it is being used with or in the position of the figures of the application and thus do not obscure the disclosure with details of the application.
At present, lithium batteries are produced in two ways, one is formed by winding and the other is formed by lamination. The production process of the laminated lithium battery includes the steps of stacking two diaphragms 121, a positive plate 120 to be tested and a negative plate 122 to be tested into a small cell 12 to be tested according to the sequence shown in fig. 3, and then transmitting the small cell to be tested to the next process to manufacture a battery cell, i.e., stacking a plurality of small cells 12 to be tested together to obtain the battery cell.
As shown in fig. 4, the positive electrode is a positive electrode sheet 120 to be detected, and the negative electrode is a negative electrode sheet 122 to be detected, and items to be detected for the small cell unit 12 of the battery cell to be detected include: an inner side diaphragm 121 width D1, an outer side diaphragm 121 width D2, an inner side negative plate width D3, an outer side negative plate width D4, an inner side positive plate width D5, an outer side positive plate width D6, a distance D7 in the horizontal direction between the left inner side diaphragm 121 and the negative plate, a distance D8 in the horizontal direction between the left outer side diaphragm 121 and the negative plate, a distance D9 in the vertical direction between the left inner side diaphragm 121 and the negative plate, a distance D10 in the vertical direction between the left outer side diaphragm 121 and the negative plate, a distance D11 in the horizontal direction between the left inner side positive plate and the negative plate, a distance D12 in the horizontal direction between the left outer side positive plate and the negative plate, a distance D13 in the vertical direction between the left outer side positive plate and the negative plate, a distance D14 in the vertical direction between the left outer side positive plate and the negative plate, an inner side tab width D15, an inner side tab height D16, an outer side tab width D17, an outer side tab height D18, a left inner side tab width D9, an outer side tab width D68656, a left side tab V20, a tab width V20, A right inner positive plate V angle V2, a left outer positive plate V3, a right outer positive plate V angle V4, a left inner negative plate V angle V5, a right inner negative plate V angle V6, a left outer negative plate V angle V7, and a right outer negative plate V angle V8. Among the above-mentioned test items, the negative electrode sheet (i.e., the positive electrode sheet) is tested based on a picture formed by imaging through a layer of the diaphragm 121 (made of white film and ceramic).
It should be noted that the apparatus provided in this application and shown in fig. 1 only shows a hardware part for head detection of a small cell, including two area-array cameras and three light sources, but a hardware part for tail detection of a small cell is consistent with the head. The two area array cameras are arranged because the pole pieces (including the positive pole piece, namely the negative pole piece and the negative pole piece, namely the positive pole piece) are wide, and one area array camera cannot obtain a complete pole piece image in imaging, so that half pole piece images are respectively shot by the two area array cameras in the width direction of the pole pieces.
Example 1
As shown in fig. 5, this embodiment 1 provides a lithium battery pole piece size detection apparatus, which includes: an imaging system 1, a light source system 2 and a control system 3;
the imaging system 1 is used for acquiring small cell images of the battery cell to be tested;
the light source system 2 is used for providing an illumination light source for the imaging system 1;
the control system 3 is in communication connection with the imaging system 1, and is configured to receive the small cell image of the battery cell to be detected transmitted by the imaging system 1, perform corresponding processing analysis on the small cell image of the battery cell to be detected according to different detection items, and determine whether the small cell image of the battery cell to be detected has an unqualified size;
the control system 3 is in communication connection with the light source system 2 and is used for controlling the on-off of the light source system 2;
the small cell image of the battery cell to be detected comprises an image of a positive plate to be detected and an image of a negative plate to be detected, the image of the positive plate to be detected is acquired through the imaging system 1 on the illumination surface of the light source system 2, and the image of the negative plate to be detected is acquired through the imaging system 1 on the backlight surface of the light source system 2.
It should be noted that the imaging system 1 realizes data transmission with the control system 3 through an image acquisition card, and the position relationship in fig. 5 does not represent the actual position relationship of each system, but is only a schematic block diagram of the data transmission control relationship. In addition, the method comprises the steps of respectively acquiring an image of a positive plate to be detected and an image of a negative plate to be detected through an imaging system 1; then the control system 3 respectively carries out calculation analysis processing on the positive plate image to be detected and the negative plate image to be detected; and finally, judging whether the size of the positive plate image to be detected and the size of the negative plate image to be detected are unqualified in the items to be detected according to the calculation and analysis results.
As shown in fig. 6 and fig. 7, further, in a specific embodiment of this embodiment 1, the imaging system 1 includes a first collecting mechanism 10 and a second collecting mechanism 11, where the first collecting mechanism 10 is disposed above one side of the electrical core small unit 12 to be tested, and a light source system 2 is disposed between the first collecting mechanism 10 and the electrical core small unit 12 to be tested; the second acquisition mechanism 11 is arranged below one side of the small cell 12 of the battery cell to be detected and is parallel to the first acquisition mechanism 10;
the first acquisition mechanism 10 includes a first area-array camera 100 and a second area-array camera 101, the first area-array camera 100 is disposed above one side of the small cell 12 to be measured, the second area-array camera 101 is disposed above the same side of the small cell 12 to be measured, and the center of the second area-array camera 101 and the center of the first area-array camera 100 are located on the same horizontal line;
the second collecting mechanism 11 includes a third area-array camera 110 and a fourth area-array camera 111, the third area-array camera 110 is disposed on one side of the small cell 12 to be tested, the fourth area-array camera 111 is disposed on the same side of the small cell 12 to be tested, and the center of the fourth area-array camera 111 and the center of the third area-array camera 110 are located on the same horizontal line.
It should be noted that the first area-array camera 100, the second area-array camera 101, the third area-array camera 110, and the fourth area-array camera 111 are not in any order, and can be replaced with each other.
As shown in fig. 6, further, in a specific implementation manner of this embodiment 1, the light source system 2 includes a first light source 20, a second light source 21, and a third light source 22, where the first light source 20, the second light source 21, and the third light source 22 are all disposed between the small electrical core unit 12 to be tested and the first collecting mechanism 10, and are disposed on the same side as the first collecting mechanism 10; the first light source 20 is configured to illuminate the top end of the small cell 12 to be tested, the second light source 21 is configured to illuminate the left side of the small cell 12 to be tested, and the third light source 22 is configured to illuminate the right side of the small cell 12 to be tested.
Further, in an embodiment of this embodiment 1, as shown in fig. 6, each of the first light source 20, the second light source 21, and the third light source 22 is a bar light source, and all three bar light sources are obliquely incident on the small cell 12 to be tested at an angle of 45 °. In addition, the first light source 20, the second light source 21 and the third light source 22 do not have any sequence, and can be replaced with each other.
As shown in fig. 8, in a further specific embodiment of this embodiment 1, the imaging system 1 includes a first collecting mechanism 10, where the first collecting mechanism 10 is disposed above one side of the small electrical core unit 12 to be measured, and a light source system 2 is disposed between the first collecting mechanism 10 and the small electrical core unit 12 to be measured; the first acquisition mechanism 10 includes a first area-array camera 100 and a second area-array camera 101, the first area-array camera 100 is disposed above one side of the small cell 12 to be measured, the second area-array camera 101 is disposed above the same side of the small cell 12 to be measured, and the center of the second area-array camera 101 and the center of the first area-array camera 100 are located on the same horizontal line; the light source system 2 comprises a first light source 20, a second light source 21, a third light source 22 and a fourth light source 23, wherein the first light source 20, the second light source 21 and the third light source 22 are all arranged between the small cell 12 to be tested and the first acquisition mechanism 10 and are arranged on the same side as the first acquisition mechanism 10, and the fourth light source 23 is arranged below the small cell 12 to be tested and is arranged in parallel with the same side of the first acquisition mechanism 10; the first light source 20 is used for irradiating the top end of the small cell 12 to be tested, the second light source 21 is used for irradiating the left side of the small cell 12 to be tested, the third light source 22 is used for irradiating the right side of the small cell 12 to be tested, and the fourth light source 23 is used for irradiating the lower side of the small cell 12 to be tested.
It should be particularly noted that the first light source 20, the second light source 21, the third light source 22 and the fourth light source 23 are all strip light sources, and the above scheme needs to collect the image of the positive electrode plate to be measured and the image of the negative electrode plate to be measured respectively twice. When the control system 3 controls the first light source 20, the second light source 21 and the third light source 22 to turn on illumination, the first acquisition mechanism 10 acquires an image of the positive plate to be detected; then, the control system 3 controls the first light source 20, the second light source 21 and the third light source 22 to be turned off, and controls the fourth light source 23 to be turned on for illumination, and the first collecting mechanism 10 collects the image of the negative plate to be measured.
Example 2
Corresponding to the embodiment 1 of the device for detecting the size of the lithium battery pole piece, the application also provides an embodiment 2 of a method for detecting the size of the lithium battery pole piece. As shown in fig. 9, the method comprises the steps of:
s101, acquiring at least two small unit images of the battery cell to be detected, wherein the at least two small unit images of the battery cell to be detected are acquired by at least two area-array cameras;
s102, extracting at least two boundary lines of at least two small unit images of the battery cell to be tested in an image coordinate system;
s103, calibrating at least two area-array cameras according to different detection items to obtain at least two boundary lines under a world coordinate system;
s104, calculating corresponding detection item values according to the distance between at least two boundary lines;
s105, comparing the detection item value with a corresponding detection item threshold value;
and S106, judging whether the small cell 12 of the battery cell to be detected has unqualified dimensions according to the comparison result and outputting a judgment result.
Further, in a specific implementation manner of this embodiment 2, in step S102, the boundary line is extracted through an edge finding algorithm and a specific area edge finding, and the edge finding attribute finds the boundary line in the small cell image of the to-be-detected electrical core according to a mode from black to white or from white to black, where at this time, coordinates of all pixel points on the boundary line are image coordinates; the calibration process of step S103 is to convert the image coordinates of all the pixels on at least two boundary lines into corresponding physical coordinates in the world coordinate system, and the specific conversion calculation process from the image coordinates of the image coordinate system to the physical coordinates in the world coordinate system is a conventional technical means of those skilled in the art, and is not described herein again; the detection item values in the step S104 correspond to the detection items, for example, if the detection item is the inside negative plate width D3, the corresponding detection item value is the width, and if the detection item is the right inside positive plate V-angle V2, the corresponding detection item value is the angle; the detection item threshold in step S105 is a detection item value corresponding to a small qualified cell unit (including a qualified positive plate, a qualified diaphragm 121, and a qualified negative plate) known to those skilled in the art, and those skilled in the art may also set a detection item threshold range according to an actual situation, which is not described in detail herein; in step S106, if the detection item value satisfies the range of the detection item threshold, the control system 3 outputs that the cell small unit is qualified, and if not, the control system 3 outputs that the cell small unit is not qualified in size.
Note that the inner and outer sensing items in the present application are calculated in the same manner, for example, the inner diaphragm 121 is wide D1 and the outer diaphragm 121 is wide D2; the left and right side detection items are calculated in the same manner, for example, the left inner positive plate V angle V1 and the right inner positive plate V angle V2.
Specifically, in this embodiment 2, four area-array cameras are used to respectively acquire small cell images of a battery cell to be tested, and perform edge finding on the small cell images to obtain four images shown in fig. 10 to 13, including two positive electrode sheet images to be tested shown in fig. 10 and 11 and two negative electrode sheet images to be tested shown in fig. 12 and 13; as shown in fig. 10 to 13, in the present embodiment 2, there are 20 boundary lines extracted in step S102, i.e., L1-L20.
Specifically, the detection item values are calculated in step S104 as follows: the inner diaphragm 121 width D1 and the outer diaphragm 121 width D2 are obtained by calculating the distance between the boundary lines L1 and L7; the inner negative electrode sheet width D3 and the outer negative electrode sheet width D4 were obtained by calculating the distance between the boundary lines L11 and L17; the inner positive plate width D5 and the outer positive plate width D6 are obtained by calculating the distance between the boundary lines L2 and L6; the distance D7 between the left inner separator 121 and the negative electrode sheet in the horizontal direction and the distance D8 between the left outer separator 121 and the negative electrode sheet in the horizontal direction are obtained by calculating the distance between the boundary lines L1 and L11; the distance D9 between the left inner separator 121 and the negative electrode sheet in the vertical direction and the distance D10 between the left outer separator 121 and the negative electrode sheet in the vertical direction are obtained by calculating the distance between the boundary lines L4 and L13; the distance D11 between the left inner positive plate and the left outer negative plate in the horizontal direction and the distance D12 between the left outer positive plate and the left outer negative plate in the horizontal direction are obtained by calculating the distance between the boundary lines L2 and L11; the distance D13 between the left inner positive plate and the left outer negative plate in the vertical direction and the distance D14 between the left outer positive plate and the left outer negative plate in the vertical direction are obtained by calculating the distance between the boundary lines L3 and L13; the inner pole ear width D15 and the outer pole ear width D17 are obtained by calculating the distance between the boundary lines L12 and L16; the inner negative ear height D16 and the outer negative ear height D18 were obtained by calculating the distance between the boundary lines L13 and L14; left inner tab shoulder width D19 and left outer tab shoulder width D20 were obtained by calculating the distance between boundary lines L11 and L12; the left inner positive plate V angle V1 and the left outer positive plate V angle V3 are obtained by calculating the distance between the boundary lines L5 and L3; the right inner positive plate V angle V2 and the right outer positive plate V angle V4 are obtained by calculating the distance between the boundary lines L8 and L10; the left inner negative plate V angle V5 and the left outer negative plate V7 are obtained by calculating the distance between the boundary lines L15 and L13; the right inner negative electrode tab V angle V6 and the right outer negative electrode tab V angle V8 are obtained by calculating the distance between the boundary lines L19 and L18.
Example 3
The application provides a terminal device, which comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor executes the computer program to realize the steps of the lithium battery pole piece defect detection method in the embodiment 2.
Example 4
The present application provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the steps of the method for detecting a defect of a lithium battery pole piece in embodiment 2 are implemented.
Application example
As shown in fig. 14 to 17, four images are obtained by performing image acquisition on a small cell unit through the lithium battery pole piece size detection apparatus in embodiment 1 of the present application.
Firstly, the control system 3 controls the light source system 2 to illuminate, the first light source 20, the second light source 21 and the third light source 22 all irradiate on the cathode plate and the diaphragm 121 of the small cell unit, the diaphragm 121 reflects light and presents white, and the cathode plate does not reflect light and presents black;
then, a first area-array camera 100 and a second area-array camera 101 of the first collecting mechanism 10 are used to respectively collect partial images of the positive plate to be detected under illumination of the light source system 2 (that is, the images of the positive plate to be detected are collected on the illumination surface of the light source system 2), the first image of the positive plate to be detected collected by the first area-array camera 100 is shown in fig. 14, and the second image of the positive plate to be detected collected by the second area-array camera 101 is shown in fig. 15;
secondly, a part of the negative plate image to be detected under illumination of the light source system 2 is respectively acquired by the third array camera 110 and the fourth array camera 111 of the second acquisition mechanism 11 (namely, the negative plate image to be detected is acquired on the backlight surface of the light source system 2), the first negative plate image to be detected acquired by the third array camera 110 is shown in fig. 16, and the second negative plate image to be detected acquired by the fourth array camera 111 is shown in fig. 17;
finally, the control system 3 performs corresponding calculation and analysis on the first positive electrode sheet image to be measured, the second positive electrode sheet image to be measured, the first negative electrode sheet image to be measured, and the second negative electrode sheet image to be measured according to steps S102 to S104 of embodiment 2, and fig. 14 to 17 may be respectively changed into fig. 10 to 13, and the specific process refers to embodiment 2, which is not repeated here, for example: if the items to be measured in step S103 are D1, D15, D3, and D5, calibrating the first area-array camera 100 and the second area-array camera 101 of the first acquisition mechanism 10, that is, converting the image coordinates of all boundary lines in the first positive plate image to be measured and the second positive plate image to be measured into coordinates in the world coordinate system; if the items to be measured in S103 are D7, D13, D11, and D16, calibrating the first area-array camera 100 of the first acquisition mechanism 10 and the third area-array camera 110 of the second acquisition mechanism 11, that is, converting the image coordinates of all boundary lines in the first positive plate image and the first negative plate image to be measured into coordinates in the world coordinate system; and step S105 to step S106 are executed again, so that a size detection result of the small cell 12 of the battery cell to be detected can be obtained.
In summary, as can be seen from fig. 14 and fig. 15, the contrast of the image of the positive electrode sheet to be measured is very high, and the edge is relatively clear, because the light source system 2 on the small cell 12 of the electric core to be measured serves as a backlight, the light can penetrate through the diaphragm 121, and is reflected into the third and fourth array cameras 110 and 111 to be white, but the negative electrode sheet to be measured 122 does not reflect light, so that the image of the negative electrode sheet to be measured acquired by the second acquisition mechanism 11 is black, and thus the contrast of the image of the negative electrode sheet to be measured shown in fig. 16 and fig. 17 is very high, and the edge is relatively clear. The subsequent control system 3 can more accurately perform edge grabbing processing on the to-be-detected positive plate image and the to-be-detected negative plate image obtained by the scheme, can more accurately calculate various line parameters required by detection items, can more accurately detect the sizes of the to-be-detected positive plate 120 and the to-be-detected negative plate 122, and has a lower misjudgment rate.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (10)
1. The utility model provides a lithium battery pole piece size detection device which characterized in that, the device includes: an imaging system, a light source system and a control system;
the imaging system is used for acquiring a small unit image of the battery cell to be tested;
the light source system is used for providing an illumination light source for the imaging system;
the control system is in communication connection with the imaging system and is used for:
receiving a small unit image of the battery cell to be detected transmitted by the imaging system;
correspondingly processing and analyzing the small cell image of the battery cell to be detected according to different detection items, and judging whether the small cell image of the battery cell to be detected has unqualified size;
the control system is in communication connection with the light source system and is used for controlling the on-off of the light source system;
the small cell image of the battery cell to be detected comprises an image of a positive plate to be detected and an image of a negative plate to be detected, the image of the positive plate to be detected is acquired through an imaging system on an illumination surface of a light source system, and the image of the negative plate to be detected is acquired through the imaging system on a backlight surface of the light source system.
2. The lithium battery pole piece size detection device of claim 1,
the imaging system comprises a first acquisition mechanism and a second acquisition mechanism, the first acquisition mechanism is arranged above one side of the small cell of the battery cell to be detected, and a light source system is arranged between the first acquisition mechanism and the small cell of the battery cell to be detected; the second acquisition mechanism is arranged below one side of the small cell of the battery cell to be detected and is arranged in parallel with the first acquisition mechanism;
the first acquisition mechanism comprises a first area-array camera and a second area-array camera, the first area-array camera is arranged above one side of the small cell of the battery cell to be detected, the second area-array camera is arranged above the same side of the small cell of the battery cell to be detected, and the center of the second area-array camera and the center of the first area-array camera are positioned on the same horizontal line;
the second acquisition mechanism comprises a third array camera and a fourth array camera, the third array camera is arranged below one side of the small cell of the battery cell to be detected, the fourth array camera is arranged below the same side of the small cell of the battery cell to be detected, and the center of the fourth array camera and the center of the third array camera are positioned on the same horizontal line.
3. The lithium battery pole piece size detection device of claim 2,
the light source system comprises a first light source, a second light source and a third light source, wherein the first light source, the second light source and the third light source are all arranged between the small cell of the battery cell to be tested and the first acquisition mechanism and are arranged on the same side as the first acquisition mechanism;
the first light source is used for irradiating the top end of the small cell of the battery cell to be tested, the second light source is used for irradiating the left side of the small cell of the battery cell to be tested, and the third light source is used for irradiating the right side of the small cell of the battery cell to be tested.
4. The lithium battery pole piece size detection device of claim 1,
the imaging system comprises a first acquisition mechanism, the first acquisition mechanism is arranged above one side of the small cell of the battery cell to be detected, and a light source system is arranged between the first acquisition mechanism and the small cell of the battery cell to be detected;
the first acquisition mechanism comprises a first area-array camera and a second area-array camera, the first area-array camera is arranged above one side of the small cell of the battery cell to be detected, the second area-array camera is arranged above the same side of the small cell of the battery cell to be detected, and the center of the second area-array camera and the center of the first area-array camera are located on the same horizontal line.
5. The lithium battery pole piece size detection device of claim 4,
the light source system comprises a first light source, a second light source, a third light source and a fourth light source, wherein the first light source, the second light source and the third light source are all arranged between the small cell of the electric core to be tested and the first acquisition mechanism and are arranged on the same side of the first acquisition mechanism, and the fourth light source is arranged below the small cell of the electric core to be tested and is arranged in parallel with the same side of the first acquisition mechanism;
the first light source is used for irradiating the top end of the small cell of the battery cell to be detected, the second light source is used for irradiating the left side of the small cell of the battery cell to be detected, the third light source is used for irradiating the right side of the small cell of the battery cell to be detected, and the fourth light source is used for irradiating the lower side of the small cell of the battery cell to be detected.
6. The lithium battery pole piece size detection device of claim 2 or 5,
the first light source, the second light source, the third light source and the fourth light source are all strip-shaped light sources, the first light source, the second light source and the third light source are all obliquely projected on a to-be-detected positive plate of the to-be-detected small cell of the battery cell at 45 degrees, and the fourth light source is obliquely projected on a to-be-detected negative plate of the to-be-detected small cell of the battery cell at 45 degrees.
7. A lithium battery pole piece size detection method is characterized by being applied to the lithium battery pole piece size detection device as claimed in any one of claims 1 to 6, and the method comprises the following steps:
acquiring at least two small cell images of the battery cell to be detected, wherein the at least two small cell images of the battery cell to be detected are acquired by at least two area-array cameras;
extracting at least two boundary lines of at least two small unit images of the battery cell to be tested under an image coordinate system;
calibrating at least two area-array cameras according to different detection items to obtain at least two boundary lines under a world coordinate system;
calculating corresponding detection item values according to the distance between at least two boundary lines;
comparing the detection item value with a corresponding detection item threshold value;
and judging whether the small cell of the battery cell to be detected has unqualified size or not according to the comparison result and outputting a judgment result.
8. The method for detecting the size of the lithium battery pole piece according to claim 7, wherein at least two area-array cameras are calibrated according to different detection items to obtain at least two boundary lines in a world coordinate system, and the method comprises the following steps:
and converting the image coordinates of all the pixel points on the at least two boundary lines into corresponding physical coordinates under a world coordinate system to obtain at least two boundary lines under the world coordinate system.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for detecting the size of a lithium battery pole piece according to claim 7 or 8 when executing the computer program.
10. A computer-readable storage medium, which stores a computer program, wherein the computer program, when executed by a processor, implements the steps of the method for detecting the size of a lithium battery pole piece according to claim 7 or 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116136487A (en) * | 2023-04-19 | 2023-05-19 | 高视科技(苏州)股份有限公司 | Pole piece fly-shooting imaging method, electronic equipment and storage medium |
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| WO2024021016A1 (en) * | 2022-07-29 | 2024-02-01 | 宁德时代新能源科技股份有限公司 | Measurement method and measurement apparatus |
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| WO2024021016A1 (en) * | 2022-07-29 | 2024-02-01 | 宁德时代新能源科技股份有限公司 | Measurement method and measurement apparatus |
| EP4336141A4 (en) * | 2022-07-29 | 2024-03-13 | Contemporary Amperex Technology Co Ltd | Measurement method and measurement apparatus |
| US11948323B2 (en) | 2022-07-29 | 2024-04-02 | Contemporary Amperex Technology Co., Limited | Measurement method and measurement apparatus |
| CN115829913A (en) * | 2022-08-10 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Naked battery cell appearance detection method and device, computer equipment and storage medium |
| CN116136487A (en) * | 2023-04-19 | 2023-05-19 | 高视科技(苏州)股份有限公司 | Pole piece fly-shooting imaging method, electronic equipment and storage medium |
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