CN112455098A - Pole piece marking method and pole piece marking system - Google Patents
Pole piece marking method and pole piece marking system Download PDFInfo
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- CN112455098A CN112455098A CN201910857752.2A CN201910857752A CN112455098A CN 112455098 A CN112455098 A CN 112455098A CN 201910857752 A CN201910857752 A CN 201910857752A CN 112455098 A CN112455098 A CN 112455098A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/44—Typewriters or selective printing mechanisms having dual functions or combined with, or coupled to, apparatus performing other functions
- B41J3/445—Printers integrated in other types of apparatus, e.g. printers integrated in cameras
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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
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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
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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
- G01N2021/8854—Grading and classifying of flaws
- G01N2021/888—Marking defects
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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
- 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
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- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The application provides a pole piece marking method, which is used for marking a pole piece with a defect, and comprises the following steps: pre-selecting a marking type; detecting whether the pole piece has defects; calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect; and controlling the marking machine to mark at the position to be marked according to the time when the position to be marked reaches the marking machine. Through pre-selecting the marking type, two working modes of fixed-point marking and fixed-area marking are met, the requirements of different production processes are met, and the method is high in compatibility and adaptability.
Description
Technical Field
The application relates to the field of battery manufacturing, in particular to a pole piece marking method and a pole piece marking system.
Background
In the production process of the lithium battery, whether the produced pole pieces are qualified or not, namely whether the pole pieces have defects or not, needs to be detected. When the pole pieces are unqualified, the pole pieces with defects are marked timely and accurately so that the pole pieces with defects are removed timely in the subsequent production process, the production of bad battery cores is avoided, and the waste of other materials is also avoided.
Disclosure of Invention
The application provides a pole piece marking method and a pole piece marking system which are stronger in adaptability and capable of meeting different production conditions.
The application provides a pole piece marking method, which is used for marking a pole piece with a defect, and comprises the following steps: pre-selecting a marking type; detecting whether the pole piece has defects; calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect; and controlling the marking machine to mark at the position to be marked according to the time when the position to be marked reaches the marking machine.
Further, the pre-selected marking types include: and selecting a fixed-point marking mode or a fixed-area marking mode according to the process requirements.
Further, the detecting whether the pole piece has a defect includes: and setting a maximum brightness threshold value and a minimum brightness threshold value, and when a high brightness area with brightness larger than the maximum brightness threshold value appears on the pole piece or a dark area with brightness smaller than the minimum brightness threshold value appears on the pole piece, determining that the pole piece has a defect.
Further, an area threshold value is set, and when the area of the highlight area or the dark black area is larger than the area threshold value, the pole piece is considered to have a defect.
Further, when the fixed point marking mode is selected, the position to be marked is the position of the defect; when the fixed-region marking mode is selected, the position to be marked is a fixed position on the pole piece.
Further, the calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect comprises the following steps: and calculating the time of the position to be marked reaching the marking machine according to the position to be marked, the installation position of the marking machine and the running speed of the pole piece.
Furthermore, different marking delays are set according to different running speeds of the pole pieces, and the marking delays are adjusted to realize accurate control of marking when the pole pieces run at high speed and low speed.
The application also provides a pole piece marking system for mark defective pole piece, include: the image acquisition device acquires an image of the surface of the pole piece; the processor detects whether the surface of the pole piece has a defect or not and calculates the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect; and the controller controls the marking machine to mark at the position to be marked.
Further, the image acquisition device acquires an image of the surface of at least one pole piece at a time.
Furthermore, the image acquisition device and the marking machine are both positioned above the pole piece.
According to the method and the device, the marking type is selected in advance, the image of the surface of the pole piece is obtained through the image obtaining device, whether the pole piece is defective or not is detected, the time of the position to be marked reaching the marking machine is calculated for the pole piece with the defect, and the marking machine is controlled to mark the position to be marked according to the calculation result. The two working modes of fixed-point marking and fixed-area marking are met, and the device is stronger in compatibility and better in adaptability.
Drawings
FIG. 1 is a schematic view of a pole piece marking method according to the present application;
FIG. 2 is a schematic view of a fixed point marking mode of the present application;
FIG. 3 is a schematic view of a region-specific marking pattern of the present application;
fig. 4 is a schematic view of marking multiple pole pieces simultaneously according to the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. Where the following description refers to the accompanying drawings, corresponding numbers in different drawings indicate corresponding or analogous elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The application provides a pole piece marking method, which is used for marking a pole piece with a defect, and comprises the following steps: pre-selecting a marking type; detecting whether the pole piece has defects; calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect; and controlling the marking machine to mark at the position to be marked according to the time when the position to be marked reaches the marking machine.
As shown in fig. one, the pole piece marking method of the embodiment includes:
step S1: the marking type is preselected.
In the production process of the battery, the pole piece needs to be detected, whether the surface of the pole piece has defects is detected, and when the surface of the pole piece has defects, the pole piece with the defects needs to be marked so as to remove the defective pole piece in the subsequent production process in time. In some process requirements, fixed-point marking is required, namely when a defect occurs at a pole piece, a mark is marked at the position of the defect, and in the subsequent process, when the defect mark is detected on the pole piece, the pole piece is known to be removed; in other process requirements, it is required to mark a fixed area, that is, no matter where the defect occurs in the pole piece, the mark is marked at a fixed position on the pole piece, the fixed position may be a coated area or an area without a coating, as long as the mark is marked at the fixed position, and in the subsequent process, it is only required to detect whether the defect mark is at the fixed position each time.
Before the operation of the equipment is started, the marking type is selected according to the process requirement, and the fixed-point marking mode or the fixed-area marking mode is determined to be selected. When the detection of one process requirement is finished and the detection of another process requirement is required, the marking type is only required to be switched.
Step S2: and detecting whether the pole piece has defects.
In this embodiment, a camera may be used to photograph the surface of the pole piece to obtain an image of the surface of the pole piece. And detecting whether the acquired image on the surface of the pole piece has a highlight area or a dark black area to judge whether the pole piece is defective.
In particular, the pole piece is usually black, and if a highlight area suddenly appears on the pole piece, it is likely that foil exposure occurs; if a darker dark area suddenly appears on the pole piece, problems may occur in the coating process or other production processes, or material problems, etc.; no matter whether the high-brightness area or the dark area is not in accordance with the production requirement, the battery core made of the pole piece has serious potential safety hazard.
In this embodiment, a maximum brightness threshold and a minimum brightness threshold are set, and when a high brightness region with brightness greater than the maximum brightness threshold appears on a pole piece, it is determined that a foil may appear on the pole piece, and the pole piece is considered to have a defect; or when a dark black area with brightness smaller than the minimum brightness threshold value appears on the pole piece, the pole piece is considered to have defects if a certain uncontrollable reason, such as coating problem or material problem, occurs in the production process, and the pole piece is caused to have problems.
Further, an area threshold value can be set, and when the area of the highlight area or the dark area is larger than the area threshold value, the pole piece is considered to have a defect. This is because if the pixels of the camera are high and the processing accuracy is good, a highlight area or a dark area which may be very small can be detected, and if the highlight area or the dark area which has a very small area is some, it can be considered as acceptable, that is, the potential safety hazard cannot be brought to the electric core produced by the pole piece. Therefore, an area threshold is set, and only when the area of the defect area is larger than the area threshold, the pole piece is indicated to have defects. The size of the area threshold can be adjusted according to specific precision requirements to adapt to different production process requirements.
Step S3: and calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect.
After the pole piece with the defect detected in the step 2 is detected, the pole piece with the defect needs to be marked. If the fixed-point marking mode is selected, the position to be marked is the position where the defect is located, namely the position where the defect occurs is the position to be marked; if the fixed-area marking mode is selected, the position to be marked is a fixed position on the pole piece, such as the base line of the pole piece, or 3 cm in front of the base line of the pole piece, or 5 cm behind the base line of the pole piece, and the like, as long as the pole piece with the defect does not cross over to the other pole piece. Once the fixed position is confirmed, the inspection of the batch of pole pieces will be marked entirely at the fixed position if a defect occurs, which is the position to be marked each time a pole piece is detected to have a defect.
Calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect comprises the following steps: and calculating the time of the position to be marked reaching the marking machine according to the position to be marked, the installation position of the marking machine and the running speed of the pole piece. Specifically, the position to be marked may be the above-mentioned defect position or a certain fixed position on the pole piece, the marking machine usually has a fixed position after the installation is completed and cannot be easily changed, the length obtained by subtracting the current position of the position to be marked from the installation position of the marking machine is the distance that the position to be marked needs to be advanced, and the time that the position to be marked reaches the marking machine can be obtained by dividing the distance by the running speed of the pole piece.
Step S4: and controlling the marking machine to mark at the position to be marked according to the time when the position to be marked reaches the marking machine.
And 3, calculating the time of the position to be marked to reach the marking machine, transmitting the data to the controller, and controlling the marking machine to mark the pole piece by the controller when the position to be marked reaches the marking machine. It should be noted that the controller may be another system component independent from the marking machine, for example, a separate industrial personal computer for controlling the action of the marking machine, or may be a control module of the marking machine integrated with the marking machine, as long as the controller can control the action of the marking machine, and the controller is not limited in particular here.
In some specific embodiments, a certain marking delay time can be set for the marking machine, and different marking delays can be set according to different running speeds of the pole pieces. When the pole piece running speed is high, the marking delay is set to be shorter, and when the pole piece running speed is low, the marking delay is set to be longer, so that the whole system can better adapt to the conditions of different pole piece running speeds, and the marking delay is flexibly adjusted at high speed and low speed, thereby more accurately controlling the system.
The application also provides a pole piece marking system which is used for marking the pole piece with the defect and comprises an image acquisition device 1, a marking device and a marking device, wherein the image acquisition device 1 is used for acquiring the image of the surface of the pole piece; the processor 2 is used for detecting whether the surface of the pole piece has defects or not and calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defects; and the controller 3 controls the marking machine 4 to mark at the position to be marked.
As shown in fig. two, the fixed point marking mode is schematically illustrated. The pole piece 6 has a defect 5, the image acquisition device 1 acquires an image of the surface of the pole piece 6, and the image acquisition device 1 can be a camera; the processor 2 detects whether the surface of the pole piece has defects, and when the defects are detected, the time when the position to be marked reaches the marking machine 4 is calculated. In the fixed-point marking mode, the position to be marked is the position of the defect 5 in the image, the distance that the defect 5 still needs to advance is obtained by subtracting the position of the defect 5 from the position of the marking machine 4, and the time that the defect 5 (namely the position to be marked) reaches the marking machine 4 is obtained by dividing the distance by the running speed of the pole piece. When the defect 5 moves below the marking machine, the controller 3 controls the marking machine 4 to mark the pole piece 6.
As shown in fig. three, the marking mode of the fixed area is schematically shown. The pole piece 6 is provided with a defect 5, the image acquisition device 1 acquires an image of the surface of the pole piece 6, and the image acquisition device 1 can also be a camera; the processor 2 detects whether the surface of the pole piece has defects, and when the defects are detected, the time when the position to be marked reaches the marking machine 4 is calculated. In the fixed-area marking mode, the position to be marked is a fixed position on the pole piece 6, and in the present embodiment, the fixed position may be selected to be in the vicinity of the base line 7, i.e., the position to be marked 8. I.e. the position to be marked is set at 8, regardless of where the defect 5 occurs on the pole piece 6. Similarly, the position of the position to be marked 8 is subtracted from the position of the marking machine 4 to obtain the distance that the position to be marked 8 still needs to advance, and the distance is divided by the running speed of the pole piece to obtain the time that the position to be marked 8 reaches the marking machine 4. When the position 8 to be marked moves to the position below the marking machine 4, the controller 3 controls the marking machine 4 to mark the pole piece 6.
As shown in fig. four, the schematic diagram of marking multiple pole pieces simultaneously is shown. The fourth diagram takes two pole pieces and fixed area marking as an example. The two pole pieces are respectively provided with a defect 5 and a defect 5', and the image acquisition device 1 can acquire images of the surfaces of the two pole pieces 6 at a time, and of course, the number of the pole pieces can be more than that when the precision requirement allows. The images of the surfaces of the two pole pieces are transmitted to the processor 2, and the processor 2 detects the images of the surfaces of the two pole pieces to judge whether the defects exist. When a defect is detected, the time for the position 8 to be marked to move to the lower part of the marking machine 4 is calculated, and the specific calculation method is the same as above, which is not described in detail here. Because of the area-specific marking pattern, the positions to be marked are both at the positions to be marked 8 beside the base line 7 even if the defects 5 and 5' occur at different positions. In the case of marking multiple pole pieces, a marking machine 4 may be installed for each pole piece, and the image acquisition device 1 may be shared by several pole pieces. The image acquisition device 1 and the marking machine 4 are both positioned above the pole pieces.
Of course, in some embodiments, the processor 2 may be integrated with the image capturing mechanism 1, and in some other embodiments, the controller 3 may be integrated with the processor 2. And will not be elaborated upon here.
According to the method and the device, the marking type is selected in advance, the image of the surface of the pole piece is obtained through the image obtaining device, whether the pole piece is defective or not is detected, the time of the position to be marked reaching the marking machine is calculated for the pole piece with the defect, and the marking machine is controlled to mark the position to be marked according to the calculation result. The two working modes of fixed-point marking and fixed-area marking are met, and the device is stronger in compatibility and better in adaptability.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. A pole piece marking method is used for marking a defective pole piece and is characterized by comprising the following steps:
pre-selecting a marking type;
detecting whether the pole piece has defects;
calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect;
and controlling the marking machine to mark at the position to be marked according to the time when the position to be marked reaches the marking machine.
2. The pole piece marking method of claim 1, wherein: the pre-selected marking types include:
and selecting a fixed-point marking mode or a fixed-area marking mode according to the process requirements.
3. The pole piece marking method of claim 1, wherein: the detecting whether the pole piece has a defect comprises:
a maximum brightness threshold and a minimum brightness threshold are set,
and when a high brightness area with the brightness larger than the maximum brightness threshold value appears on the pole piece, or when a dark black area with the brightness smaller than the minimum brightness threshold value appears on the pole piece, the pole piece is considered to have a defect.
4. The pole piece marking process of claim 3, wherein:
and setting an area threshold, and when the area of the highlight area or the dark black area is larger than the area threshold, considering that the pole piece has a defect.
5. The pole piece marking process of claim 2, wherein:
when the fixed point marking mode is selected, the position to be marked is the position of the defect;
when the fixed-region marking mode is selected, the position to be marked is a fixed position on the pole piece.
6. The pole piece marking process of claim 5, wherein: the calculating the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect comprises the following steps:
and calculating the time of the position to be marked reaching the marking machine according to the position to be marked, the installation position of the marking machine and the running speed of the pole piece.
7. The pole piece marking method of claim 6, wherein: according to different running speeds of the pole pieces, different marking delays are set, and the marking delays are adjusted to realize accurate control of marking when the pole pieces run at high speed and low speed.
8. A pole piece marking system for marking a defective pole piece, comprising:
the image acquisition device acquires an image of the surface of the pole piece;
the processor detects whether the surface of the pole piece has a defect or not and calculates the time of the position to be marked to reach the marking machine aiming at the pole piece with the defect;
and the controller controls the marking machine to mark at the position to be marked.
9. The pole piece marking system of claim 8, wherein: the image acquisition device acquires an image of the surface of at least one pole piece at a time.
10. The pole piece marking system of claim 8, wherein: the image acquisition device and the marking machine are both positioned above the pole piece.
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| CN201910857752.2A CN112455098A (en) | 2019-09-09 | 2019-09-09 | Pole piece marking method and pole piece marking system |
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| CN201910857752.2A CN112455098A (en) | 2019-09-09 | 2019-09-09 | Pole piece marking method and pole piece marking system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113570601A (en) * | 2021-09-24 | 2021-10-29 | 深圳新视智科技术有限公司 | Defect marking method and system |
| CN114633556A (en) * | 2021-12-31 | 2022-06-17 | 深圳市嘉同达自动化设备有限公司 | Lithium battery coating failure identification method and system, coating machine and storage medium |
| CN116118363A (en) * | 2023-04-20 | 2023-05-16 | 杭州百子尖科技股份有限公司 | Intelligent defect marking method, device, system and storage medium |
| CN117340439A (en) * | 2023-12-06 | 2024-01-05 | 宁德时代新能源科技股份有限公司 | Pole piece marking system and method |
| CN117773599A (en) * | 2024-02-22 | 2024-03-29 | 宁德时代新能源科技股份有限公司 | Pole piece rolling and slitting system and method |
| CN117798193A (en) * | 2024-02-22 | 2024-04-02 | 宁德时代新能源科技股份有限公司 | Pole piece rolling and slitting system and method |
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